source "drivers/devfreq/Kconfig"
+source "drivers/iio/Kconfig"
+
endmenu
obj-$(CONFIG_HYPERV) += hv/
obj-$(CONFIG_PM_DEVFREQ) += devfreq/
+obj-$(CONFIG_IIO) += iio/
--- /dev/null
+#
+# Industrial I/O subsytem configuration
+#
+
+menuconfig IIO
+ tristate "Industrial I/O support"
+ depends on GENERIC_HARDIRQS
+ help
+ The industrial I/O subsystem provides a unified framework for
+ drivers for many different types of embedded sensors using a
+ number of different physical interfaces (i2c, spi, etc). See
+ Documentation/iio for more information.
+
+if IIO
+
+config IIO_BUFFER
+ bool "Enable buffer support within IIO"
+ help
+ Provide core support for various buffer based data
+ acquisition methods.
+
+if IIO_BUFFER
+
+config IIO_KFIFO_BUF
+ select IIO_TRIGGER
+ tristate "Industrial I/O buffering based on kfifo"
+ help
+ A simple fifo based on kfifo. Use this if you want a fifo
+ rather than a ring buffer. Note that this currently provides
+ no buffer events so it is up to userspace to work out how
+ often to read from the buffer.
+
+endif # IIO_BUFFER
+
+config IIO_TRIGGER
+ boolean "Enable triggered sampling support"
+ help
+ Provides IIO core support for triggers. Currently these
+ are used to initialize capture of samples to push into
+ ring buffers. The triggers are effectively a 'capture
+ data now' interrupt.
+
+config IIO_CONSUMERS_PER_TRIGGER
+ int "Maximum number of consumers per trigger"
+ depends on IIO_TRIGGER
+ default "2"
+ help
+ This value controls the maximum number of consumers that a
+ given trigger may handle. Default is 2.
+
+endif # IIO
--- /dev/null
+#
+# Makefile for the industrial I/O core.
+#
+
+obj-$(CONFIG_IIO) += industrialio.o
+industrialio-y := industrialio-core.o industrialio-event.o inkern.o
+industrialio-$(CONFIG_IIO_BUFFER) += industrialio-buffer.o
+industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o
+
+obj-$(CONFIG_IIO_KFIFO_BUF) += kfifo_buf.o
--- /dev/null
+/* The industrial I/O core function defs.
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * These definitions are meant for use only within the IIO core, not individual
+ * drivers.
+ */
+
+#ifndef _IIO_CORE_H_
+#define _IIO_CORE_H_
+#include <linux/kernel.h>
+#include <linux/device.h>
+
+struct iio_chan_spec;
+struct iio_dev;
+
+
+int __iio_add_chan_devattr(const char *postfix,
+ struct iio_chan_spec const *chan,
+ ssize_t (*func)(struct device *dev,
+ struct device_attribute *attr,
+ char *buf),
+ ssize_t (*writefunc)(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len),
+ u64 mask,
+ bool generic,
+ struct device *dev,
+ struct list_head *attr_list);
+
+/* Event interface flags */
+#define IIO_BUSY_BIT_POS 1
+
+#ifdef CONFIG_IIO_BUFFER
+struct poll_table_struct;
+
+unsigned int iio_buffer_poll(struct file *filp,
+ struct poll_table_struct *wait);
+ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
+ size_t n, loff_t *f_ps);
+
+
+#define iio_buffer_poll_addr (&iio_buffer_poll)
+#define iio_buffer_read_first_n_outer_addr (&iio_buffer_read_first_n_outer)
+
+#else
+
+#define iio_buffer_poll_addr NULL
+#define iio_buffer_read_first_n_outer_addr NULL
+
+#endif
+
+int iio_device_register_eventset(struct iio_dev *indio_dev);
+void iio_device_unregister_eventset(struct iio_dev *indio_dev);
+int iio_event_getfd(struct iio_dev *indio_dev);
+
+#endif
--- /dev/null
+
+/* The industrial I/O core, trigger consumer handling functions
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#ifdef CONFIG_IIO_TRIGGER
+/**
+ * iio_device_register_trigger_consumer() - set up an iio_dev to use triggers
+ * @indio_dev: iio_dev associated with the device that will consume the trigger
+ **/
+void iio_device_register_trigger_consumer(struct iio_dev *indio_dev);
+
+/**
+ * iio_device_unregister_trigger_consumer() - reverse the registration process
+ * @indio_dev: iio_dev associated with the device that consumed the trigger
+ **/
+void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev);
+
+#else
+
+/**
+ * iio_device_register_trigger_consumer() - set up an iio_dev to use triggers
+ * @indio_dev: iio_dev associated with the device that will consume the trigger
+ **/
+static int iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
+{
+ return 0;
+};
+
+/**
+ * iio_device_unregister_trigger_consumer() - reverse the registration process
+ * @indio_dev: iio_dev associated with the device that consumed the trigger
+ **/
+static void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
+{
+};
+
+#endif /* CONFIG_TRIGGER_CONSUMER */
+
+
+
--- /dev/null
+/* The industrial I/O core
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * Handling of buffer allocation / resizing.
+ *
+ *
+ * Things to look at here.
+ * - Better memory allocation techniques?
+ * - Alternative access techniques?
+ */
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+
+#include <linux/iio/iio.h>
+#include "iio_core.h"
+#include <linux/iio/sysfs.h>
+#include <linux/iio/buffer.h>
+
+static const char * const iio_endian_prefix[] = {
+ [IIO_BE] = "be",
+ [IIO_LE] = "le",
+};
+
+/**
+ * iio_buffer_read_first_n_outer() - chrdev read for buffer access
+ *
+ * This function relies on all buffer implementations having an
+ * iio_buffer as their first element.
+ **/
+ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
+ size_t n, loff_t *f_ps)
+{
+ struct iio_dev *indio_dev = filp->private_data;
+ struct iio_buffer *rb = indio_dev->buffer;
+
+ if (!rb || !rb->access->read_first_n)
+ return -EINVAL;
+ return rb->access->read_first_n(rb, n, buf);
+}
+
+/**
+ * iio_buffer_poll() - poll the buffer to find out if it has data
+ */
+unsigned int iio_buffer_poll(struct file *filp,
+ struct poll_table_struct *wait)
+{
+ struct iio_dev *indio_dev = filp->private_data;
+ struct iio_buffer *rb = indio_dev->buffer;
+
+ poll_wait(filp, &rb->pollq, wait);
+ if (rb->stufftoread)
+ return POLLIN | POLLRDNORM;
+ /* need a way of knowing if there may be enough data... */
+ return 0;
+}
+
+void iio_buffer_init(struct iio_buffer *buffer)
+{
+ INIT_LIST_HEAD(&buffer->demux_list);
+ init_waitqueue_head(&buffer->pollq);
+}
+EXPORT_SYMBOL(iio_buffer_init);
+
+static ssize_t iio_show_scan_index(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index);
+}
+
+static ssize_t iio_show_fixed_type(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ u8 type = this_attr->c->scan_type.endianness;
+
+ if (type == IIO_CPU) {
+#ifdef __LITTLE_ENDIAN
+ type = IIO_LE;
+#else
+ type = IIO_BE;
+#endif
+ }
+ return sprintf(buf, "%s:%c%d/%d>>%u\n",
+ iio_endian_prefix[type],
+ this_attr->c->scan_type.sign,
+ this_attr->c->scan_type.realbits,
+ this_attr->c->scan_type.storagebits,
+ this_attr->c->scan_type.shift);
+}
+
+static ssize_t iio_scan_el_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+
+ ret = test_bit(to_iio_dev_attr(attr)->address,
+ indio_dev->buffer->scan_mask);
+
+ return sprintf(buf, "%d\n", ret);
+}
+
+static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit)
+{
+ clear_bit(bit, buffer->scan_mask);
+ return 0;
+}
+
+static ssize_t iio_scan_el_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ int ret;
+ bool state;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_buffer *buffer = indio_dev->buffer;
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+
+ ret = strtobool(buf, &state);
+ if (ret < 0)
+ return ret;
+ mutex_lock(&indio_dev->mlock);
+ if (iio_buffer_enabled(indio_dev)) {
+ ret = -EBUSY;
+ goto error_ret;
+ }
+ ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address);
+ if (ret < 0)
+ goto error_ret;
+ if (!state && ret) {
+ ret = iio_scan_mask_clear(buffer, this_attr->address);
+ if (ret)
+ goto error_ret;
+ } else if (state && !ret) {
+ ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address);
+ if (ret)
+ goto error_ret;
+ }
+
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret < 0 ? ret : len;
+
+}
+
+static ssize_t iio_scan_el_ts_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp);
+}
+
+static ssize_t iio_scan_el_ts_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ int ret;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ bool state;
+
+ ret = strtobool(buf, &state);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&indio_dev->mlock);
+ if (iio_buffer_enabled(indio_dev)) {
+ ret = -EBUSY;
+ goto error_ret;
+ }
+ indio_dev->buffer->scan_timestamp = state;
+ indio_dev->scan_timestamp = state;
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret ? ret : len;
+}
+
+static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ int ret, attrcount = 0;
+ struct iio_buffer *buffer = indio_dev->buffer;
+
+ ret = __iio_add_chan_devattr("index",
+ chan,
+ &iio_show_scan_index,
+ NULL,
+ 0,
+ 0,
+ &indio_dev->dev,
+ &buffer->scan_el_dev_attr_list);
+ if (ret)
+ goto error_ret;
+ attrcount++;
+ ret = __iio_add_chan_devattr("type",
+ chan,
+ &iio_show_fixed_type,
+ NULL,
+ 0,
+ 0,
+ &indio_dev->dev,
+ &buffer->scan_el_dev_attr_list);
+ if (ret)
+ goto error_ret;
+ attrcount++;
+ if (chan->type != IIO_TIMESTAMP)
+ ret = __iio_add_chan_devattr("en",
+ chan,
+ &iio_scan_el_show,
+ &iio_scan_el_store,
+ chan->scan_index,
+ 0,
+ &indio_dev->dev,
+ &buffer->scan_el_dev_attr_list);
+ else
+ ret = __iio_add_chan_devattr("en",
+ chan,
+ &iio_scan_el_ts_show,
+ &iio_scan_el_ts_store,
+ chan->scan_index,
+ 0,
+ &indio_dev->dev,
+ &buffer->scan_el_dev_attr_list);
+ attrcount++;
+ ret = attrcount;
+error_ret:
+ return ret;
+}
+
+static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev,
+ struct iio_dev_attr *p)
+{
+ kfree(p->dev_attr.attr.name);
+ kfree(p);
+}
+
+static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev)
+{
+ struct iio_dev_attr *p, *n;
+ struct iio_buffer *buffer = indio_dev->buffer;
+
+ list_for_each_entry_safe(p, n,
+ &buffer->scan_el_dev_attr_list, l)
+ iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p);
+}
+
+static const char * const iio_scan_elements_group_name = "scan_elements";
+
+int iio_buffer_register(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *channels,
+ int num_channels)
+{
+ struct iio_dev_attr *p;
+ struct attribute **attr;
+ struct iio_buffer *buffer = indio_dev->buffer;
+ int ret, i, attrn, attrcount, attrcount_orig = 0;
+
+ if (buffer->attrs)
+ indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs;
+
+ if (buffer->scan_el_attrs != NULL) {
+ attr = buffer->scan_el_attrs->attrs;
+ while (*attr++ != NULL)
+ attrcount_orig++;
+ }
+ attrcount = attrcount_orig;
+ INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list);
+ if (channels) {
+ /* new magic */
+ for (i = 0; i < num_channels; i++) {
+ /* Establish necessary mask length */
+ if (channels[i].scan_index >
+ (int)indio_dev->masklength - 1)
+ indio_dev->masklength
+ = indio_dev->channels[i].scan_index + 1;
+
+ ret = iio_buffer_add_channel_sysfs(indio_dev,
+ &channels[i]);
+ if (ret < 0)
+ goto error_cleanup_dynamic;
+ attrcount += ret;
+ if (channels[i].type == IIO_TIMESTAMP)
+ indio_dev->scan_index_timestamp =
+ channels[i].scan_index;
+ }
+ if (indio_dev->masklength && buffer->scan_mask == NULL) {
+ buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength),
+ sizeof(*buffer->scan_mask),
+ GFP_KERNEL);
+ if (buffer->scan_mask == NULL) {
+ ret = -ENOMEM;
+ goto error_cleanup_dynamic;
+ }
+ }
+ }
+
+ buffer->scan_el_group.name = iio_scan_elements_group_name;
+
+ buffer->scan_el_group.attrs = kcalloc(attrcount + 1,
+ sizeof(buffer->scan_el_group.attrs[0]),
+ GFP_KERNEL);
+ if (buffer->scan_el_group.attrs == NULL) {
+ ret = -ENOMEM;
+ goto error_free_scan_mask;
+ }
+ if (buffer->scan_el_attrs)
+ memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs,
+ sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig);
+ attrn = attrcount_orig;
+
+ list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l)
+ buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr;
+ indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group;
+
+ return 0;
+
+error_free_scan_mask:
+ kfree(buffer->scan_mask);
+error_cleanup_dynamic:
+ __iio_buffer_attr_cleanup(indio_dev);
+
+ return ret;
+}
+EXPORT_SYMBOL(iio_buffer_register);
+
+void iio_buffer_unregister(struct iio_dev *indio_dev)
+{
+ kfree(indio_dev->buffer->scan_mask);
+ kfree(indio_dev->buffer->scan_el_group.attrs);
+ __iio_buffer_attr_cleanup(indio_dev);
+}
+EXPORT_SYMBOL(iio_buffer_unregister);
+
+ssize_t iio_buffer_read_length(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_buffer *buffer = indio_dev->buffer;
+
+ if (buffer->access->get_length)
+ return sprintf(buf, "%d\n",
+ buffer->access->get_length(buffer));
+
+ return 0;
+}
+EXPORT_SYMBOL(iio_buffer_read_length);
+
+ssize_t iio_buffer_write_length(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ int ret;
+ ulong val;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_buffer *buffer = indio_dev->buffer;
+
+ ret = strict_strtoul(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ if (buffer->access->get_length)
+ if (val == buffer->access->get_length(buffer))
+ return len;
+
+ mutex_lock(&indio_dev->mlock);
+ if (iio_buffer_enabled(indio_dev)) {
+ ret = -EBUSY;
+ } else {
+ if (buffer->access->set_length)
+ buffer->access->set_length(buffer, val);
+ ret = 0;
+ }
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret ? ret : len;
+}
+EXPORT_SYMBOL(iio_buffer_write_length);
+
+ssize_t iio_buffer_store_enable(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ int ret;
+ bool requested_state, current_state;
+ int previous_mode;
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_buffer *buffer = indio_dev->buffer;
+
+ mutex_lock(&indio_dev->mlock);
+ previous_mode = indio_dev->currentmode;
+ requested_state = !(buf[0] == '0');
+ current_state = iio_buffer_enabled(indio_dev);
+ if (current_state == requested_state) {
+ printk(KERN_INFO "iio-buffer, current state requested again\n");
+ goto done;
+ }
+ if (requested_state) {
+ if (indio_dev->setup_ops->preenable) {
+ ret = indio_dev->setup_ops->preenable(indio_dev);
+ if (ret) {
+ printk(KERN_ERR
+ "Buffer not started:"
+ "buffer preenable failed\n");
+ goto error_ret;
+ }
+ }
+ if (buffer->access->request_update) {
+ ret = buffer->access->request_update(buffer);
+ if (ret) {
+ printk(KERN_INFO
+ "Buffer not started:"
+ "buffer parameter update failed\n");
+ goto error_ret;
+ }
+ }
+ /* Definitely possible for devices to support both of these.*/
+ if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) {
+ if (!indio_dev->trig) {
+ printk(KERN_INFO
+ "Buffer not started: no trigger\n");
+ ret = -EINVAL;
+ goto error_ret;
+ }
+ indio_dev->currentmode = INDIO_BUFFER_TRIGGERED;
+ } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE)
+ indio_dev->currentmode = INDIO_BUFFER_HARDWARE;
+ else { /* should never be reached */
+ ret = -EINVAL;
+ goto error_ret;
+ }
+
+ if (indio_dev->setup_ops->postenable) {
+ ret = indio_dev->setup_ops->postenable(indio_dev);
+ if (ret) {
+ printk(KERN_INFO
+ "Buffer not started:"
+ "postenable failed\n");
+ indio_dev->currentmode = previous_mode;
+ if (indio_dev->setup_ops->postdisable)
+ indio_dev->setup_ops->
+ postdisable(indio_dev);
+ goto error_ret;
+ }
+ }
+ } else {
+ if (indio_dev->setup_ops->predisable) {
+ ret = indio_dev->setup_ops->predisable(indio_dev);
+ if (ret)
+ goto error_ret;
+ }
+ indio_dev->currentmode = INDIO_DIRECT_MODE;
+ if (indio_dev->setup_ops->postdisable) {
+ ret = indio_dev->setup_ops->postdisable(indio_dev);
+ if (ret)
+ goto error_ret;
+ }
+ }
+done:
+ mutex_unlock(&indio_dev->mlock);
+ return len;
+
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
+}
+EXPORT_SYMBOL(iio_buffer_store_enable);
+
+ssize_t iio_buffer_show_enable(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n", iio_buffer_enabled(indio_dev));
+}
+EXPORT_SYMBOL(iio_buffer_show_enable);
+
+/* note NULL used as error indicator as it doesn't make sense. */
+static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks,
+ unsigned int masklength,
+ const unsigned long *mask)
+{
+ if (bitmap_empty(mask, masklength))
+ return NULL;
+ while (*av_masks) {
+ if (bitmap_subset(mask, av_masks, masklength))
+ return av_masks;
+ av_masks += BITS_TO_LONGS(masklength);
+ }
+ return NULL;
+}
+
+static int iio_compute_scan_bytes(struct iio_dev *indio_dev, const long *mask,
+ bool timestamp)
+{
+ const struct iio_chan_spec *ch;
+ unsigned bytes = 0;
+ int length, i;
+
+ /* How much space will the demuxed element take? */
+ for_each_set_bit(i, mask,
+ indio_dev->masklength) {
+ ch = iio_find_channel_from_si(indio_dev, i);
+ length = ch->scan_type.storagebits / 8;
+ bytes = ALIGN(bytes, length);
+ bytes += length;
+ }
+ if (timestamp) {
+ ch = iio_find_channel_from_si(indio_dev,
+ indio_dev->scan_index_timestamp);
+ length = ch->scan_type.storagebits / 8;
+ bytes = ALIGN(bytes, length);
+ bytes += length;
+ }
+ return bytes;
+}
+
+int iio_sw_buffer_preenable(struct iio_dev *indio_dev)
+{
+ struct iio_buffer *buffer = indio_dev->buffer;
+ dev_dbg(&indio_dev->dev, "%s\n", __func__);
+
+ /* How much space will the demuxed element take? */
+ indio_dev->scan_bytes =
+ iio_compute_scan_bytes(indio_dev, buffer->scan_mask,
+ buffer->scan_timestamp);
+ buffer->access->set_bytes_per_datum(buffer, indio_dev->scan_bytes);
+
+ /* What scan mask do we actually have ?*/
+ if (indio_dev->available_scan_masks)
+ indio_dev->active_scan_mask =
+ iio_scan_mask_match(indio_dev->available_scan_masks,
+ indio_dev->masklength,
+ buffer->scan_mask);
+ else
+ indio_dev->active_scan_mask = buffer->scan_mask;
+ iio_update_demux(indio_dev);
+
+ if (indio_dev->info->update_scan_mode)
+ return indio_dev->info
+ ->update_scan_mode(indio_dev,
+ indio_dev->active_scan_mask);
+ return 0;
+}
+EXPORT_SYMBOL(iio_sw_buffer_preenable);
+
+/**
+ * iio_scan_mask_set() - set particular bit in the scan mask
+ * @buffer: the buffer whose scan mask we are interested in
+ * @bit: the bit to be set.
+ **/
+int iio_scan_mask_set(struct iio_dev *indio_dev,
+ struct iio_buffer *buffer, int bit)
+{
+ const unsigned long *mask;
+ unsigned long *trialmask;
+
+ trialmask = kmalloc(sizeof(*trialmask)*
+ BITS_TO_LONGS(indio_dev->masklength),
+ GFP_KERNEL);
+
+ if (trialmask == NULL)
+ return -ENOMEM;
+ if (!indio_dev->masklength) {
+ WARN_ON("trying to set scanmask prior to registering buffer\n");
+ kfree(trialmask);
+ return -EINVAL;
+ }
+ bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength);
+ set_bit(bit, trialmask);
+
+ if (indio_dev->available_scan_masks) {
+ mask = iio_scan_mask_match(indio_dev->available_scan_masks,
+ indio_dev->masklength,
+ trialmask);
+ if (!mask) {
+ kfree(trialmask);
+ return -EINVAL;
+ }
+ }
+ bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength);
+
+ kfree(trialmask);
+
+ return 0;
+};
+EXPORT_SYMBOL_GPL(iio_scan_mask_set);
+
+int iio_scan_mask_query(struct iio_dev *indio_dev,
+ struct iio_buffer *buffer, int bit)
+{
+ if (bit > indio_dev->masklength)
+ return -EINVAL;
+
+ if (!buffer->scan_mask)
+ return 0;
+
+ return test_bit(bit, buffer->scan_mask);
+};
+EXPORT_SYMBOL_GPL(iio_scan_mask_query);
+
+/**
+ * struct iio_demux_table() - table describing demux memcpy ops
+ * @from: index to copy from
+ * @to: index to copy to
+ * @length: how many bytes to copy
+ * @l: list head used for management
+ */
+struct iio_demux_table {
+ unsigned from;
+ unsigned to;
+ unsigned length;
+ struct list_head l;
+};
+
+static unsigned char *iio_demux(struct iio_buffer *buffer,
+ unsigned char *datain)
+{
+ struct iio_demux_table *t;
+
+ if (list_empty(&buffer->demux_list))
+ return datain;
+ list_for_each_entry(t, &buffer->demux_list, l)
+ memcpy(buffer->demux_bounce + t->to,
+ datain + t->from, t->length);
+
+ return buffer->demux_bounce;
+}
+
+int iio_push_to_buffer(struct iio_buffer *buffer, unsigned char *data,
+ s64 timestamp)
+{
+ unsigned char *dataout = iio_demux(buffer, data);
+
+ return buffer->access->store_to(buffer, dataout, timestamp);
+}
+EXPORT_SYMBOL_GPL(iio_push_to_buffer);
+
+static void iio_buffer_demux_free(struct iio_buffer *buffer)
+{
+ struct iio_demux_table *p, *q;
+ list_for_each_entry_safe(p, q, &buffer->demux_list, l) {
+ list_del(&p->l);
+ kfree(p);
+ }
+}
+
+int iio_update_demux(struct iio_dev *indio_dev)
+{
+ const struct iio_chan_spec *ch;
+ struct iio_buffer *buffer = indio_dev->buffer;
+ int ret, in_ind = -1, out_ind, length;
+ unsigned in_loc = 0, out_loc = 0;
+ struct iio_demux_table *p;
+
+ /* Clear out any old demux */
+ iio_buffer_demux_free(buffer);
+ kfree(buffer->demux_bounce);
+ buffer->demux_bounce = NULL;
+
+ /* First work out which scan mode we will actually have */
+ if (bitmap_equal(indio_dev->active_scan_mask,
+ buffer->scan_mask,
+ indio_dev->masklength))
+ return 0;
+
+ /* Now we have the two masks, work from least sig and build up sizes */
+ for_each_set_bit(out_ind,
+ indio_dev->active_scan_mask,
+ indio_dev->masklength) {
+ in_ind = find_next_bit(indio_dev->active_scan_mask,
+ indio_dev->masklength,
+ in_ind + 1);
+ while (in_ind != out_ind) {
+ in_ind = find_next_bit(indio_dev->active_scan_mask,
+ indio_dev->masklength,
+ in_ind + 1);
+ ch = iio_find_channel_from_si(indio_dev, in_ind);
+ length = ch->scan_type.storagebits/8;
+ /* Make sure we are aligned */
+ in_loc += length;
+ if (in_loc % length)
+ in_loc += length - in_loc % length;
+ }
+ p = kmalloc(sizeof(*p), GFP_KERNEL);
+ if (p == NULL) {
+ ret = -ENOMEM;
+ goto error_clear_mux_table;
+ }
+ ch = iio_find_channel_from_si(indio_dev, in_ind);
+ length = ch->scan_type.storagebits/8;
+ if (out_loc % length)
+ out_loc += length - out_loc % length;
+ if (in_loc % length)
+ in_loc += length - in_loc % length;
+ p->from = in_loc;
+ p->to = out_loc;
+ p->length = length;
+ list_add_tail(&p->l, &buffer->demux_list);
+ out_loc += length;
+ in_loc += length;
+ }
+ /* Relies on scan_timestamp being last */
+ if (buffer->scan_timestamp) {
+ p = kmalloc(sizeof(*p), GFP_KERNEL);
+ if (p == NULL) {
+ ret = -ENOMEM;
+ goto error_clear_mux_table;
+ }
+ ch = iio_find_channel_from_si(indio_dev,
+ indio_dev->scan_index_timestamp);
+ length = ch->scan_type.storagebits/8;
+ if (out_loc % length)
+ out_loc += length - out_loc % length;
+ if (in_loc % length)
+ in_loc += length - in_loc % length;
+ p->from = in_loc;
+ p->to = out_loc;
+ p->length = length;
+ list_add_tail(&p->l, &buffer->demux_list);
+ out_loc += length;
+ in_loc += length;
+ }
+ buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL);
+ if (buffer->demux_bounce == NULL) {
+ ret = -ENOMEM;
+ goto error_clear_mux_table;
+ }
+ return 0;
+
+error_clear_mux_table:
+ iio_buffer_demux_free(buffer);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_update_demux);
--- /dev/null
+/* The industrial I/O core
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * Based on elements of hwmon and input subsystems.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/idr.h>
+#include <linux/kdev_t.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/cdev.h>
+#include <linux/slab.h>
+#include <linux/anon_inodes.h>
+#include <linux/debugfs.h>
+#include <linux/iio/iio.h>
+#include "iio_core.h"
+#include "iio_core_trigger.h"
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+
+/* IDA to assign each registered device a unique id*/
+static DEFINE_IDA(iio_ida);
+
+static dev_t iio_devt;
+
+#define IIO_DEV_MAX 256
+struct bus_type iio_bus_type = {
+ .name = "iio",
+};
+EXPORT_SYMBOL(iio_bus_type);
+
+static struct dentry *iio_debugfs_dentry;
+
+static const char * const iio_direction[] = {
+ [0] = "in",
+ [1] = "out",
+};
+
+static const char * const iio_chan_type_name_spec[] = {
+ [IIO_VOLTAGE] = "voltage",
+ [IIO_CURRENT] = "current",
+ [IIO_POWER] = "power",
+ [IIO_ACCEL] = "accel",
+ [IIO_ANGL_VEL] = "anglvel",
+ [IIO_MAGN] = "magn",
+ [IIO_LIGHT] = "illuminance",
+ [IIO_INTENSITY] = "intensity",
+ [IIO_PROXIMITY] = "proximity",
+ [IIO_TEMP] = "temp",
+ [IIO_INCLI] = "incli",
+ [IIO_ROT] = "rot",
+ [IIO_ANGL] = "angl",
+ [IIO_TIMESTAMP] = "timestamp",
+ [IIO_CAPACITANCE] = "capacitance",
+};
+
+static const char * const iio_modifier_names[] = {
+ [IIO_MOD_X] = "x",
+ [IIO_MOD_Y] = "y",
+ [IIO_MOD_Z] = "z",
+ [IIO_MOD_LIGHT_BOTH] = "both",
+ [IIO_MOD_LIGHT_IR] = "ir",
+};
+
+/* relies on pairs of these shared then separate */
+static const char * const iio_chan_info_postfix[] = {
+ [IIO_CHAN_INFO_RAW] = "raw",
+ [IIO_CHAN_INFO_PROCESSED] = "input",
+ [IIO_CHAN_INFO_SCALE] = "scale",
+ [IIO_CHAN_INFO_OFFSET] = "offset",
+ [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
+ [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
+ [IIO_CHAN_INFO_PEAK] = "peak_raw",
+ [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
+ [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
+ [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
+ [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
+ = "filter_low_pass_3db_frequency",
+ [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
+};
+
+const struct iio_chan_spec
+*iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
+{
+ int i;
+
+ for (i = 0; i < indio_dev->num_channels; i++)
+ if (indio_dev->channels[i].scan_index == si)
+ return &indio_dev->channels[i];
+ return NULL;
+}
+
+/* This turns up an awful lot */
+ssize_t iio_read_const_attr(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
+}
+EXPORT_SYMBOL(iio_read_const_attr);
+
+static int __init iio_init(void)
+{
+ int ret;
+
+ /* Register sysfs bus */
+ ret = bus_register(&iio_bus_type);
+ if (ret < 0) {
+ printk(KERN_ERR
+ "%s could not register bus type\n",
+ __FILE__);
+ goto error_nothing;
+ }
+
+ ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
+ if (ret < 0) {
+ printk(KERN_ERR "%s: failed to allocate char dev region\n",
+ __FILE__);
+ goto error_unregister_bus_type;
+ }
+
+ iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
+
+ return 0;
+
+error_unregister_bus_type:
+ bus_unregister(&iio_bus_type);
+error_nothing:
+ return ret;
+}
+
+static void __exit iio_exit(void)
+{
+ if (iio_devt)
+ unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
+ bus_unregister(&iio_bus_type);
+ debugfs_remove(iio_debugfs_dentry);
+}
+
+#if defined(CONFIG_DEBUG_FS)
+static int iio_debugfs_open(struct inode *inode, struct file *file)
+{
+ if (inode->i_private)
+ file->private_data = inode->i_private;
+
+ return 0;
+}
+
+static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct iio_dev *indio_dev = file->private_data;
+ char buf[20];
+ unsigned val = 0;
+ ssize_t len;
+ int ret;
+
+ ret = indio_dev->info->debugfs_reg_access(indio_dev,
+ indio_dev->cached_reg_addr,
+ 0, &val);
+ if (ret)
+ dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
+
+ len = snprintf(buf, sizeof(buf), "0x%X\n", val);
+
+ return simple_read_from_buffer(userbuf, count, ppos, buf, len);
+}
+
+static ssize_t iio_debugfs_write_reg(struct file *file,
+ const char __user *userbuf, size_t count, loff_t *ppos)
+{
+ struct iio_dev *indio_dev = file->private_data;
+ unsigned reg, val;
+ char buf[80];
+ int ret;
+
+ count = min_t(size_t, count, (sizeof(buf)-1));
+ if (copy_from_user(buf, userbuf, count))
+ return -EFAULT;
+
+ buf[count] = 0;
+
+ ret = sscanf(buf, "%i %i", ®, &val);
+
+ switch (ret) {
+ case 1:
+ indio_dev->cached_reg_addr = reg;
+ break;
+ case 2:
+ indio_dev->cached_reg_addr = reg;
+ ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
+ val, NULL);
+ if (ret) {
+ dev_err(indio_dev->dev.parent, "%s: write failed\n",
+ __func__);
+ return ret;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return count;
+}
+
+static const struct file_operations iio_debugfs_reg_fops = {
+ .open = iio_debugfs_open,
+ .read = iio_debugfs_read_reg,
+ .write = iio_debugfs_write_reg,
+};
+
+static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
+{
+ debugfs_remove_recursive(indio_dev->debugfs_dentry);
+}
+
+static int iio_device_register_debugfs(struct iio_dev *indio_dev)
+{
+ struct dentry *d;
+
+ if (indio_dev->info->debugfs_reg_access == NULL)
+ return 0;
+
+ if (IS_ERR(iio_debugfs_dentry))
+ return 0;
+
+ indio_dev->debugfs_dentry =
+ debugfs_create_dir(dev_name(&indio_dev->dev),
+ iio_debugfs_dentry);
+ if (IS_ERR(indio_dev->debugfs_dentry))
+ return PTR_ERR(indio_dev->debugfs_dentry);
+
+ if (indio_dev->debugfs_dentry == NULL) {
+ dev_warn(indio_dev->dev.parent,
+ "Failed to create debugfs directory\n");
+ return -EFAULT;
+ }
+
+ d = debugfs_create_file("direct_reg_access", 0644,
+ indio_dev->debugfs_dentry,
+ indio_dev, &iio_debugfs_reg_fops);
+ if (!d) {
+ iio_device_unregister_debugfs(indio_dev);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+#else
+static int iio_device_register_debugfs(struct iio_dev *indio_dev)
+{
+ return 0;
+}
+
+static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
+{
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static ssize_t iio_read_channel_ext_info(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ const struct iio_chan_spec_ext_info *ext_info;
+
+ ext_info = &this_attr->c->ext_info[this_attr->address];
+
+ return ext_info->read(indio_dev, this_attr->c, buf);
+}
+
+static ssize_t iio_write_channel_ext_info(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ const struct iio_chan_spec_ext_info *ext_info;
+
+ ext_info = &this_attr->c->ext_info[this_attr->address];
+
+ return ext_info->write(indio_dev, this_attr->c, buf, len);
+}
+
+static ssize_t iio_read_channel_info(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int val, val2;
+ int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
+ &val, &val2, this_attr->address);
+
+ if (ret < 0)
+ return ret;
+
+ if (ret == IIO_VAL_INT)
+ return sprintf(buf, "%d\n", val);
+ else if (ret == IIO_VAL_INT_PLUS_MICRO) {
+ if (val2 < 0)
+ return sprintf(buf, "-%d.%06u\n", val, -val2);
+ else
+ return sprintf(buf, "%d.%06u\n", val, val2);
+ } else if (ret == IIO_VAL_INT_PLUS_NANO) {
+ if (val2 < 0)
+ return sprintf(buf, "-%d.%09u\n", val, -val2);
+ else
+ return sprintf(buf, "%d.%09u\n", val, val2);
+ } else
+ return 0;
+}
+
+static ssize_t iio_write_channel_info(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int ret, integer = 0, fract = 0, fract_mult = 100000;
+ bool integer_part = true, negative = false;
+
+ /* Assumes decimal - precision based on number of digits */
+ if (!indio_dev->info->write_raw)
+ return -EINVAL;
+
+ if (indio_dev->info->write_raw_get_fmt)
+ switch (indio_dev->info->write_raw_get_fmt(indio_dev,
+ this_attr->c, this_attr->address)) {
+ case IIO_VAL_INT_PLUS_MICRO:
+ fract_mult = 100000;
+ break;
+ case IIO_VAL_INT_PLUS_NANO:
+ fract_mult = 100000000;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (buf[0] == '-') {
+ negative = true;
+ buf++;
+ }
+
+ while (*buf) {
+ if ('0' <= *buf && *buf <= '9') {
+ if (integer_part)
+ integer = integer*10 + *buf - '0';
+ else {
+ fract += fract_mult*(*buf - '0');
+ if (fract_mult == 1)
+ break;
+ fract_mult /= 10;
+ }
+ } else if (*buf == '\n') {
+ if (*(buf + 1) == '\0')
+ break;
+ else
+ return -EINVAL;
+ } else if (*buf == '.') {
+ integer_part = false;
+ } else {
+ return -EINVAL;
+ }
+ buf++;
+ }
+ if (negative) {
+ if (integer)
+ integer = -integer;
+ else
+ fract = -fract;
+ }
+
+ ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
+ integer, fract, this_attr->address);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static
+int __iio_device_attr_init(struct device_attribute *dev_attr,
+ const char *postfix,
+ struct iio_chan_spec const *chan,
+ ssize_t (*readfunc)(struct device *dev,
+ struct device_attribute *attr,
+ char *buf),
+ ssize_t (*writefunc)(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len),
+ bool generic)
+{
+ int ret;
+ char *name_format, *full_postfix;
+ sysfs_attr_init(&dev_attr->attr);
+
+ /* Build up postfix of <extend_name>_<modifier>_postfix */
+ if (chan->modified && !generic) {
+ if (chan->extend_name)
+ full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
+ iio_modifier_names[chan
+ ->channel2],
+ chan->extend_name,
+ postfix);
+ else
+ full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
+ iio_modifier_names[chan
+ ->channel2],
+ postfix);
+ } else {
+ if (chan->extend_name == NULL)
+ full_postfix = kstrdup(postfix, GFP_KERNEL);
+ else
+ full_postfix = kasprintf(GFP_KERNEL,
+ "%s_%s",
+ chan->extend_name,
+ postfix);
+ }
+ if (full_postfix == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ if (chan->differential) { /* Differential can not have modifier */
+ if (generic)
+ name_format
+ = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
+ iio_direction[chan->output],
+ iio_chan_type_name_spec[chan->type],
+ iio_chan_type_name_spec[chan->type],
+ full_postfix);
+ else if (chan->indexed)
+ name_format
+ = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s",
+ iio_direction[chan->output],
+ iio_chan_type_name_spec[chan->type],
+ chan->channel,
+ iio_chan_type_name_spec[chan->type],
+ chan->channel2,
+ full_postfix);
+ else {
+ WARN_ON("Differential channels must be indexed\n");
+ ret = -EINVAL;
+ goto error_free_full_postfix;
+ }
+ } else { /* Single ended */
+ if (generic)
+ name_format
+ = kasprintf(GFP_KERNEL, "%s_%s_%s",
+ iio_direction[chan->output],
+ iio_chan_type_name_spec[chan->type],
+ full_postfix);
+ else if (chan->indexed)
+ name_format
+ = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
+ iio_direction[chan->output],
+ iio_chan_type_name_spec[chan->type],
+ chan->channel,
+ full_postfix);
+ else
+ name_format
+ = kasprintf(GFP_KERNEL, "%s_%s_%s",
+ iio_direction[chan->output],
+ iio_chan_type_name_spec[chan->type],
+ full_postfix);
+ }
+ if (name_format == NULL) {
+ ret = -ENOMEM;
+ goto error_free_full_postfix;
+ }
+ dev_attr->attr.name = kasprintf(GFP_KERNEL,
+ name_format,
+ chan->channel,
+ chan->channel2);
+ if (dev_attr->attr.name == NULL) {
+ ret = -ENOMEM;
+ goto error_free_name_format;
+ }
+
+ if (readfunc) {
+ dev_attr->attr.mode |= S_IRUGO;
+ dev_attr->show = readfunc;
+ }
+
+ if (writefunc) {
+ dev_attr->attr.mode |= S_IWUSR;
+ dev_attr->store = writefunc;
+ }
+ kfree(name_format);
+ kfree(full_postfix);
+
+ return 0;
+
+error_free_name_format:
+ kfree(name_format);
+error_free_full_postfix:
+ kfree(full_postfix);
+error_ret:
+ return ret;
+}
+
+static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
+{
+ kfree(dev_attr->attr.name);
+}
+
+int __iio_add_chan_devattr(const char *postfix,
+ struct iio_chan_spec const *chan,
+ ssize_t (*readfunc)(struct device *dev,
+ struct device_attribute *attr,
+ char *buf),
+ ssize_t (*writefunc)(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len),
+ u64 mask,
+ bool generic,
+ struct device *dev,
+ struct list_head *attr_list)
+{
+ int ret;
+ struct iio_dev_attr *iio_attr, *t;
+
+ iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL);
+ if (iio_attr == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ ret = __iio_device_attr_init(&iio_attr->dev_attr,
+ postfix, chan,
+ readfunc, writefunc, generic);
+ if (ret)
+ goto error_iio_dev_attr_free;
+ iio_attr->c = chan;
+ iio_attr->address = mask;
+ list_for_each_entry(t, attr_list, l)
+ if (strcmp(t->dev_attr.attr.name,
+ iio_attr->dev_attr.attr.name) == 0) {
+ if (!generic)
+ dev_err(dev, "tried to double register : %s\n",
+ t->dev_attr.attr.name);
+ ret = -EBUSY;
+ goto error_device_attr_deinit;
+ }
+ list_add(&iio_attr->l, attr_list);
+
+ return 0;
+
+error_device_attr_deinit:
+ __iio_device_attr_deinit(&iio_attr->dev_attr);
+error_iio_dev_attr_free:
+ kfree(iio_attr);
+error_ret:
+ return ret;
+}
+
+static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan)
+{
+ int ret, attrcount = 0;
+ int i;
+ const struct iio_chan_spec_ext_info *ext_info;
+
+ if (chan->channel < 0)
+ return 0;
+ for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
+ ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
+ chan,
+ &iio_read_channel_info,
+ &iio_write_channel_info,
+ i/2,
+ !(i%2),
+ &indio_dev->dev,
+ &indio_dev->channel_attr_list);
+ if (ret == -EBUSY && (i%2 == 0)) {
+ ret = 0;
+ continue;
+ }
+ if (ret < 0)
+ goto error_ret;
+ attrcount++;
+ }
+
+ if (chan->ext_info) {
+ unsigned int i = 0;
+ for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
+ ret = __iio_add_chan_devattr(ext_info->name,
+ chan,
+ ext_info->read ?
+ &iio_read_channel_ext_info : NULL,
+ ext_info->write ?
+ &iio_write_channel_ext_info : NULL,
+ i,
+ ext_info->shared,
+ &indio_dev->dev,
+ &indio_dev->channel_attr_list);
+ i++;
+ if (ret == -EBUSY && ext_info->shared)
+ continue;
+
+ if (ret)
+ goto error_ret;
+
+ attrcount++;
+ }
+ }
+
+ ret = attrcount;
+error_ret:
+ return ret;
+}
+
+static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev,
+ struct iio_dev_attr *p)
+{
+ kfree(p->dev_attr.attr.name);
+ kfree(p);
+}
+
+static ssize_t iio_show_dev_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ return sprintf(buf, "%s\n", indio_dev->name);
+}
+
+static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
+
+static int iio_device_register_sysfs(struct iio_dev *indio_dev)
+{
+ int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
+ struct iio_dev_attr *p, *n;
+ struct attribute **attr;
+
+ /* First count elements in any existing group */
+ if (indio_dev->info->attrs) {
+ attr = indio_dev->info->attrs->attrs;
+ while (*attr++ != NULL)
+ attrcount_orig++;
+ }
+ attrcount = attrcount_orig;
+ /*
+ * New channel registration method - relies on the fact a group does
+ * not need to be initialized if it is name is NULL.
+ */
+ INIT_LIST_HEAD(&indio_dev->channel_attr_list);
+ if (indio_dev->channels)
+ for (i = 0; i < indio_dev->num_channels; i++) {
+ ret = iio_device_add_channel_sysfs(indio_dev,
+ &indio_dev
+ ->channels[i]);
+ if (ret < 0)
+ goto error_clear_attrs;
+ attrcount += ret;
+ }
+
+ if (indio_dev->name)
+ attrcount++;
+
+ indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
+ sizeof(indio_dev->chan_attr_group.attrs[0]),
+ GFP_KERNEL);
+ if (indio_dev->chan_attr_group.attrs == NULL) {
+ ret = -ENOMEM;
+ goto error_clear_attrs;
+ }
+ /* Copy across original attributes */
+ if (indio_dev->info->attrs)
+ memcpy(indio_dev->chan_attr_group.attrs,
+ indio_dev->info->attrs->attrs,
+ sizeof(indio_dev->chan_attr_group.attrs[0])
+ *attrcount_orig);
+ attrn = attrcount_orig;
+ /* Add all elements from the list. */
+ list_for_each_entry(p, &indio_dev->channel_attr_list, l)
+ indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
+ if (indio_dev->name)
+ indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
+
+ indio_dev->groups[indio_dev->groupcounter++] =
+ &indio_dev->chan_attr_group;
+
+ return 0;
+
+error_clear_attrs:
+ list_for_each_entry_safe(p, n,
+ &indio_dev->channel_attr_list, l) {
+ list_del(&p->l);
+ iio_device_remove_and_free_read_attr(indio_dev, p);
+ }
+
+ return ret;
+}
+
+static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
+{
+
+ struct iio_dev_attr *p, *n;
+
+ list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) {
+ list_del(&p->l);
+ iio_device_remove_and_free_read_attr(indio_dev, p);
+ }
+ kfree(indio_dev->chan_attr_group.attrs);
+}
+
+static void iio_dev_release(struct device *device)
+{
+ struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev);
+ cdev_del(&indio_dev->chrdev);
+ if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
+ iio_device_unregister_trigger_consumer(indio_dev);
+ iio_device_unregister_eventset(indio_dev);
+ iio_device_unregister_sysfs(indio_dev);
+ iio_device_unregister_debugfs(indio_dev);
+}
+
+static struct device_type iio_dev_type = {
+ .name = "iio_device",
+ .release = iio_dev_release,
+};
+
+struct iio_dev *iio_allocate_device(int sizeof_priv)
+{
+ struct iio_dev *dev;
+ size_t alloc_size;
+
+ alloc_size = sizeof(struct iio_dev);
+ if (sizeof_priv) {
+ alloc_size = ALIGN(alloc_size, IIO_ALIGN);
+ alloc_size += sizeof_priv;
+ }
+ /* ensure 32-byte alignment of whole construct ? */
+ alloc_size += IIO_ALIGN - 1;
+
+ dev = kzalloc(alloc_size, GFP_KERNEL);
+
+ if (dev) {
+ dev->dev.groups = dev->groups;
+ dev->dev.type = &iio_dev_type;
+ dev->dev.bus = &iio_bus_type;
+ device_initialize(&dev->dev);
+ dev_set_drvdata(&dev->dev, (void *)dev);
+ mutex_init(&dev->mlock);
+ mutex_init(&dev->info_exist_lock);
+
+ dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
+ if (dev->id < 0) {
+ /* cannot use a dev_err as the name isn't available */
+ printk(KERN_ERR "Failed to get id\n");
+ kfree(dev);
+ return NULL;
+ }
+ dev_set_name(&dev->dev, "iio:device%d", dev->id);
+ }
+
+ return dev;
+}
+EXPORT_SYMBOL(iio_allocate_device);
+
+void iio_free_device(struct iio_dev *dev)
+{
+ if (dev) {
+ ida_simple_remove(&iio_ida, dev->id);
+ kfree(dev);
+ }
+}
+EXPORT_SYMBOL(iio_free_device);
+
+/**
+ * iio_chrdev_open() - chrdev file open for buffer access and ioctls
+ **/
+static int iio_chrdev_open(struct inode *inode, struct file *filp)
+{
+ struct iio_dev *indio_dev = container_of(inode->i_cdev,
+ struct iio_dev, chrdev);
+
+ if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
+ return -EBUSY;
+
+ filp->private_data = indio_dev;
+
+ return 0;
+}
+
+/**
+ * iio_chrdev_release() - chrdev file close buffer access and ioctls
+ **/
+static int iio_chrdev_release(struct inode *inode, struct file *filp)
+{
+ struct iio_dev *indio_dev = container_of(inode->i_cdev,
+ struct iio_dev, chrdev);
+ clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
+ return 0;
+}
+
+/* Somewhat of a cross file organization violation - ioctls here are actually
+ * event related */
+static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct iio_dev *indio_dev = filp->private_data;
+ int __user *ip = (int __user *)arg;
+ int fd;
+
+ if (cmd == IIO_GET_EVENT_FD_IOCTL) {
+ fd = iio_event_getfd(indio_dev);
+ if (copy_to_user(ip, &fd, sizeof(fd)))
+ return -EFAULT;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static const struct file_operations iio_buffer_fileops = {
+ .read = iio_buffer_read_first_n_outer_addr,
+ .release = iio_chrdev_release,
+ .open = iio_chrdev_open,
+ .poll = iio_buffer_poll_addr,
+ .owner = THIS_MODULE,
+ .llseek = noop_llseek,
+ .unlocked_ioctl = iio_ioctl,
+ .compat_ioctl = iio_ioctl,
+};
+
+static const struct iio_buffer_setup_ops noop_ring_setup_ops;
+
+int iio_device_register(struct iio_dev *indio_dev)
+{
+ int ret;
+
+ /* configure elements for the chrdev */
+ indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
+
+ ret = iio_device_register_debugfs(indio_dev);
+ if (ret) {
+ dev_err(indio_dev->dev.parent,
+ "Failed to register debugfs interfaces\n");
+ goto error_ret;
+ }
+ ret = iio_device_register_sysfs(indio_dev);
+ if (ret) {
+ dev_err(indio_dev->dev.parent,
+ "Failed to register sysfs interfaces\n");
+ goto error_unreg_debugfs;
+ }
+ ret = iio_device_register_eventset(indio_dev);
+ if (ret) {
+ dev_err(indio_dev->dev.parent,
+ "Failed to register event set\n");
+ goto error_free_sysfs;
+ }
+ if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
+ iio_device_register_trigger_consumer(indio_dev);
+
+ if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
+ indio_dev->setup_ops == NULL)
+ indio_dev->setup_ops = &noop_ring_setup_ops;
+
+ ret = device_add(&indio_dev->dev);
+ if (ret < 0)
+ goto error_unreg_eventset;
+ cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
+ indio_dev->chrdev.owner = indio_dev->info->driver_module;
+ ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
+ if (ret < 0)
+ goto error_del_device;
+ return 0;
+
+error_del_device:
+ device_del(&indio_dev->dev);
+error_unreg_eventset:
+ iio_device_unregister_eventset(indio_dev);
+error_free_sysfs:
+ iio_device_unregister_sysfs(indio_dev);
+error_unreg_debugfs:
+ iio_device_unregister_debugfs(indio_dev);
+error_ret:
+ return ret;
+}
+EXPORT_SYMBOL(iio_device_register);
+
+void iio_device_unregister(struct iio_dev *indio_dev)
+{
+ mutex_lock(&indio_dev->info_exist_lock);
+ indio_dev->info = NULL;
+ mutex_unlock(&indio_dev->info_exist_lock);
+ device_unregister(&indio_dev->dev);
+}
+EXPORT_SYMBOL(iio_device_unregister);
+subsys_initcall(iio_init);
+module_exit(iio_exit);
+
+MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
+MODULE_DESCRIPTION("Industrial I/O core");
+MODULE_LICENSE("GPL");
--- /dev/null
+/* Industrial I/O event handling
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * Based on elements of hwmon and input subsystems.
+ */
+
+#include <linux/anon_inodes.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/kfifo.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/wait.h>
+#include <linux/iio/iio.h>
+#include "iio_core.h"
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+
+/**
+ * struct iio_event_interface - chrdev interface for an event line
+ * @wait: wait queue to allow blocking reads of events
+ * @det_events: list of detected events
+ * @dev_attr_list: list of event interface sysfs attribute
+ * @flags: file operations related flags including busy flag.
+ * @group: event interface sysfs attribute group
+ */
+struct iio_event_interface {
+ wait_queue_head_t wait;
+ DECLARE_KFIFO(det_events, struct iio_event_data, 16);
+
+ struct list_head dev_attr_list;
+ unsigned long flags;
+ struct attribute_group group;
+};
+
+int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
+{
+ struct iio_event_interface *ev_int = indio_dev->event_interface;
+ struct iio_event_data ev;
+ int copied;
+
+ /* Does anyone care? */
+ spin_lock(&ev_int->wait.lock);
+ if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
+
+ ev.id = ev_code;
+ ev.timestamp = timestamp;
+
+ copied = kfifo_put(&ev_int->det_events, &ev);
+ if (copied != 0)
+ wake_up_locked_poll(&ev_int->wait, POLLIN);
+ }
+ spin_unlock(&ev_int->wait.lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(iio_push_event);
+
+/**
+ * iio_event_poll() - poll the event queue to find out if it has data
+ */
+static unsigned int iio_event_poll(struct file *filep,
+ struct poll_table_struct *wait)
+{
+ struct iio_event_interface *ev_int = filep->private_data;
+ unsigned int events = 0;
+
+ poll_wait(filep, &ev_int->wait, wait);
+
+ spin_lock(&ev_int->wait.lock);
+ if (!kfifo_is_empty(&ev_int->det_events))
+ events = POLLIN | POLLRDNORM;
+ spin_unlock(&ev_int->wait.lock);
+
+ return events;
+}
+
+static ssize_t iio_event_chrdev_read(struct file *filep,
+ char __user *buf,
+ size_t count,
+ loff_t *f_ps)
+{
+ struct iio_event_interface *ev_int = filep->private_data;
+ unsigned int copied;
+ int ret;
+
+ if (count < sizeof(struct iio_event_data))
+ return -EINVAL;
+
+ spin_lock(&ev_int->wait.lock);
+ if (kfifo_is_empty(&ev_int->det_events)) {
+ if (filep->f_flags & O_NONBLOCK) {
+ ret = -EAGAIN;
+ goto error_unlock;
+ }
+ /* Blocking on device; waiting for something to be there */
+ ret = wait_event_interruptible_locked(ev_int->wait,
+ !kfifo_is_empty(&ev_int->det_events));
+ if (ret)
+ goto error_unlock;
+ /* Single access device so no one else can get the data */
+ }
+
+ ret = kfifo_to_user(&ev_int->det_events, buf, count, &copied);
+
+error_unlock:
+ spin_unlock(&ev_int->wait.lock);
+
+ return ret ? ret : copied;
+}
+
+static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
+{
+ struct iio_event_interface *ev_int = filep->private_data;
+
+ spin_lock(&ev_int->wait.lock);
+ __clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
+ /*
+ * In order to maintain a clean state for reopening,
+ * clear out any awaiting events. The mask will prevent
+ * any new __iio_push_event calls running.
+ */
+ kfifo_reset_out(&ev_int->det_events);
+ spin_unlock(&ev_int->wait.lock);
+
+ return 0;
+}
+
+static const struct file_operations iio_event_chrdev_fileops = {
+ .read = iio_event_chrdev_read,
+ .poll = iio_event_poll,
+ .release = iio_event_chrdev_release,
+ .owner = THIS_MODULE,
+ .llseek = noop_llseek,
+};
+
+int iio_event_getfd(struct iio_dev *indio_dev)
+{
+ struct iio_event_interface *ev_int = indio_dev->event_interface;
+ int fd;
+
+ if (ev_int == NULL)
+ return -ENODEV;
+
+ spin_lock(&ev_int->wait.lock);
+ if (__test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
+ spin_unlock(&ev_int->wait.lock);
+ return -EBUSY;
+ }
+ spin_unlock(&ev_int->wait.lock);
+ fd = anon_inode_getfd("iio:event",
+ &iio_event_chrdev_fileops, ev_int, O_RDONLY);
+ if (fd < 0) {
+ spin_lock(&ev_int->wait.lock);
+ __clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
+ spin_unlock(&ev_int->wait.lock);
+ }
+ return fd;
+}
+
+static const char * const iio_ev_type_text[] = {
+ [IIO_EV_TYPE_THRESH] = "thresh",
+ [IIO_EV_TYPE_MAG] = "mag",
+ [IIO_EV_TYPE_ROC] = "roc",
+ [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
+ [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
+};
+
+static const char * const iio_ev_dir_text[] = {
+ [IIO_EV_DIR_EITHER] = "either",
+ [IIO_EV_DIR_RISING] = "rising",
+ [IIO_EV_DIR_FALLING] = "falling"
+};
+
+static ssize_t iio_ev_state_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int ret;
+ bool val;
+
+ ret = strtobool(buf, &val);
+ if (ret < 0)
+ return ret;
+
+ ret = indio_dev->info->write_event_config(indio_dev,
+ this_attr->address,
+ val);
+ return (ret < 0) ? ret : len;
+}
+
+static ssize_t iio_ev_state_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int val = indio_dev->info->read_event_config(indio_dev,
+ this_attr->address);
+
+ if (val < 0)
+ return val;
+ else
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t iio_ev_value_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int val, ret;
+
+ ret = indio_dev->info->read_event_value(indio_dev,
+ this_attr->address, &val);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t iio_ev_value_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ unsigned long val;
+ int ret;
+
+ if (!indio_dev->info->write_event_value)
+ return -EINVAL;
+
+ ret = strict_strtoul(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ ret = indio_dev->info->write_event_value(indio_dev, this_attr->address,
+ val);
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+
+static int iio_device_add_event_sysfs(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan)
+{
+ int ret = 0, i, attrcount = 0;
+ u64 mask = 0;
+ char *postfix;
+ if (!chan->event_mask)
+ return 0;
+
+ for_each_set_bit(i, &chan->event_mask, sizeof(chan->event_mask)*8) {
+ postfix = kasprintf(GFP_KERNEL, "%s_%s_en",
+ iio_ev_type_text[i/IIO_EV_DIR_MAX],
+ iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
+ if (postfix == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ if (chan->modified)
+ mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel,
+ i/IIO_EV_DIR_MAX,
+ i%IIO_EV_DIR_MAX);
+ else if (chan->differential)
+ mask = IIO_EVENT_CODE(chan->type,
+ 0, 0,
+ i%IIO_EV_DIR_MAX,
+ i/IIO_EV_DIR_MAX,
+ 0,
+ chan->channel,
+ chan->channel2);
+ else
+ mask = IIO_UNMOD_EVENT_CODE(chan->type,
+ chan->channel,
+ i/IIO_EV_DIR_MAX,
+ i%IIO_EV_DIR_MAX);
+
+ ret = __iio_add_chan_devattr(postfix,
+ chan,
+ &iio_ev_state_show,
+ iio_ev_state_store,
+ mask,
+ 0,
+ &indio_dev->dev,
+ &indio_dev->event_interface->
+ dev_attr_list);
+ kfree(postfix);
+ if (ret)
+ goto error_ret;
+ attrcount++;
+ postfix = kasprintf(GFP_KERNEL, "%s_%s_value",
+ iio_ev_type_text[i/IIO_EV_DIR_MAX],
+ iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
+ if (postfix == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ ret = __iio_add_chan_devattr(postfix, chan,
+ iio_ev_value_show,
+ iio_ev_value_store,
+ mask,
+ 0,
+ &indio_dev->dev,
+ &indio_dev->event_interface->
+ dev_attr_list);
+ kfree(postfix);
+ if (ret)
+ goto error_ret;
+ attrcount++;
+ }
+ ret = attrcount;
+error_ret:
+ return ret;
+}
+
+static inline void __iio_remove_event_config_attrs(struct iio_dev *indio_dev)
+{
+ struct iio_dev_attr *p, *n;
+ list_for_each_entry_safe(p, n,
+ &indio_dev->event_interface->
+ dev_attr_list, l) {
+ kfree(p->dev_attr.attr.name);
+ kfree(p);
+ }
+}
+
+static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev)
+{
+ int j, ret, attrcount = 0;
+
+ INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
+ /* Dynically created from the channels array */
+ for (j = 0; j < indio_dev->num_channels; j++) {
+ ret = iio_device_add_event_sysfs(indio_dev,
+ &indio_dev->channels[j]);
+ if (ret < 0)
+ goto error_clear_attrs;
+ attrcount += ret;
+ }
+ return attrcount;
+
+error_clear_attrs:
+ __iio_remove_event_config_attrs(indio_dev);
+
+ return ret;
+}
+
+static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)
+{
+ int j;
+
+ for (j = 0; j < indio_dev->num_channels; j++)
+ if (indio_dev->channels[j].event_mask != 0)
+ return true;
+ return false;
+}
+
+static void iio_setup_ev_int(struct iio_event_interface *ev_int)
+{
+ INIT_KFIFO(ev_int->det_events);
+ init_waitqueue_head(&ev_int->wait);
+}
+
+static const char *iio_event_group_name = "events";
+int iio_device_register_eventset(struct iio_dev *indio_dev)
+{
+ struct iio_dev_attr *p;
+ int ret = 0, attrcount_orig = 0, attrcount, attrn;
+ struct attribute **attr;
+
+ if (!(indio_dev->info->event_attrs ||
+ iio_check_for_dynamic_events(indio_dev)))
+ return 0;
+
+ indio_dev->event_interface =
+ kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
+ if (indio_dev->event_interface == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ iio_setup_ev_int(indio_dev->event_interface);
+ if (indio_dev->info->event_attrs != NULL) {
+ attr = indio_dev->info->event_attrs->attrs;
+ while (*attr++ != NULL)
+ attrcount_orig++;
+ }
+ attrcount = attrcount_orig;
+ if (indio_dev->channels) {
+ ret = __iio_add_event_config_attrs(indio_dev);
+ if (ret < 0)
+ goto error_free_setup_event_lines;
+ attrcount += ret;
+ }
+
+ indio_dev->event_interface->group.name = iio_event_group_name;
+ indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1,
+ sizeof(indio_dev->event_interface->group.attrs[0]),
+ GFP_KERNEL);
+ if (indio_dev->event_interface->group.attrs == NULL) {
+ ret = -ENOMEM;
+ goto error_free_setup_event_lines;
+ }
+ if (indio_dev->info->event_attrs)
+ memcpy(indio_dev->event_interface->group.attrs,
+ indio_dev->info->event_attrs->attrs,
+ sizeof(indio_dev->event_interface->group.attrs[0])
+ *attrcount_orig);
+ attrn = attrcount_orig;
+ /* Add all elements from the list. */
+ list_for_each_entry(p,
+ &indio_dev->event_interface->dev_attr_list,
+ l)
+ indio_dev->event_interface->group.attrs[attrn++] =
+ &p->dev_attr.attr;
+ indio_dev->groups[indio_dev->groupcounter++] =
+ &indio_dev->event_interface->group;
+
+ return 0;
+
+error_free_setup_event_lines:
+ __iio_remove_event_config_attrs(indio_dev);
+ kfree(indio_dev->event_interface);
+error_ret:
+
+ return ret;
+}
+
+void iio_device_unregister_eventset(struct iio_dev *indio_dev)
+{
+ if (indio_dev->event_interface == NULL)
+ return;
+ __iio_remove_event_config_attrs(indio_dev);
+ kfree(indio_dev->event_interface->group.attrs);
+ kfree(indio_dev->event_interface);
+}
--- /dev/null
+/* The industrial I/O core, trigger handling functions
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/idr.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include "iio_core.h"
+#include "iio_core_trigger.h"
+#include <linux/iio/trigger_consumer.h>
+
+/* RFC - Question of approach
+ * Make the common case (single sensor single trigger)
+ * simple by starting trigger capture from when first sensors
+ * is added.
+ *
+ * Complex simultaneous start requires use of 'hold' functionality
+ * of the trigger. (not implemented)
+ *
+ * Any other suggestions?
+ */
+
+static DEFINE_IDA(iio_trigger_ida);
+
+/* Single list of all available triggers */
+static LIST_HEAD(iio_trigger_list);
+static DEFINE_MUTEX(iio_trigger_list_lock);
+
+/**
+ * iio_trigger_read_name() - retrieve useful identifying name
+ **/
+static ssize_t iio_trigger_read_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_trigger *trig = dev_get_drvdata(dev);
+ return sprintf(buf, "%s\n", trig->name);
+}
+
+static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
+
+/**
+ * iio_trigger_register_sysfs() - create a device for this trigger
+ * @trig_info: the trigger
+ *
+ * Also adds any control attribute registered by the trigger driver
+ **/
+static int iio_trigger_register_sysfs(struct iio_trigger *trig_info)
+{
+ return sysfs_add_file_to_group(&trig_info->dev.kobj,
+ &dev_attr_name.attr,
+ NULL);
+}
+
+static void iio_trigger_unregister_sysfs(struct iio_trigger *trig_info)
+{
+ sysfs_remove_file_from_group(&trig_info->dev.kobj,
+ &dev_attr_name.attr,
+ NULL);
+}
+
+int iio_trigger_register(struct iio_trigger *trig_info)
+{
+ int ret;
+
+ trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL);
+ if (trig_info->id < 0) {
+ ret = trig_info->id;
+ goto error_ret;
+ }
+ /* Set the name used for the sysfs directory etc */
+ dev_set_name(&trig_info->dev, "trigger%ld",
+ (unsigned long) trig_info->id);
+
+ ret = device_add(&trig_info->dev);
+ if (ret)
+ goto error_unregister_id;
+
+ ret = iio_trigger_register_sysfs(trig_info);
+ if (ret)
+ goto error_device_del;
+
+ /* Add to list of available triggers held by the IIO core */
+ mutex_lock(&iio_trigger_list_lock);
+ list_add_tail(&trig_info->list, &iio_trigger_list);
+ mutex_unlock(&iio_trigger_list_lock);
+
+ return 0;
+
+error_device_del:
+ device_del(&trig_info->dev);
+error_unregister_id:
+ ida_simple_remove(&iio_trigger_ida, trig_info->id);
+error_ret:
+ return ret;
+}
+EXPORT_SYMBOL(iio_trigger_register);
+
+void iio_trigger_unregister(struct iio_trigger *trig_info)
+{
+ mutex_lock(&iio_trigger_list_lock);
+ list_del(&trig_info->list);
+ mutex_unlock(&iio_trigger_list_lock);
+
+ iio_trigger_unregister_sysfs(trig_info);
+ ida_simple_remove(&iio_trigger_ida, trig_info->id);
+ /* Possible issue in here */
+ device_unregister(&trig_info->dev);
+}
+EXPORT_SYMBOL(iio_trigger_unregister);
+
+static struct iio_trigger *iio_trigger_find_by_name(const char *name,
+ size_t len)
+{
+ struct iio_trigger *trig = NULL, *iter;
+
+ mutex_lock(&iio_trigger_list_lock);
+ list_for_each_entry(iter, &iio_trigger_list, list)
+ if (sysfs_streq(iter->name, name)) {
+ trig = iter;
+ break;
+ }
+ mutex_unlock(&iio_trigger_list_lock);
+
+ return trig;
+}
+
+void iio_trigger_poll(struct iio_trigger *trig, s64 time)
+{
+ int i;
+ if (!trig->use_count)
+ for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++)
+ if (trig->subirqs[i].enabled) {
+ trig->use_count++;
+ generic_handle_irq(trig->subirq_base + i);
+ }
+}
+EXPORT_SYMBOL(iio_trigger_poll);
+
+irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private)
+{
+ iio_trigger_poll(private, iio_get_time_ns());
+ return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll);
+
+void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time)
+{
+ int i;
+ if (!trig->use_count)
+ for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++)
+ if (trig->subirqs[i].enabled) {
+ trig->use_count++;
+ handle_nested_irq(trig->subirq_base + i);
+ }
+}
+EXPORT_SYMBOL(iio_trigger_poll_chained);
+
+void iio_trigger_notify_done(struct iio_trigger *trig)
+{
+ trig->use_count--;
+ if (trig->use_count == 0 && trig->ops && trig->ops->try_reenable)
+ if (trig->ops->try_reenable(trig))
+ /* Missed and interrupt so launch new poll now */
+ iio_trigger_poll(trig, 0);
+}
+EXPORT_SYMBOL(iio_trigger_notify_done);
+
+/* Trigger Consumer related functions */
+static int iio_trigger_get_irq(struct iio_trigger *trig)
+{
+ int ret;
+ mutex_lock(&trig->pool_lock);
+ ret = bitmap_find_free_region(trig->pool,
+ CONFIG_IIO_CONSUMERS_PER_TRIGGER,
+ ilog2(1));
+ mutex_unlock(&trig->pool_lock);
+ if (ret >= 0)
+ ret += trig->subirq_base;
+
+ return ret;
+}
+
+static void iio_trigger_put_irq(struct iio_trigger *trig, int irq)
+{
+ mutex_lock(&trig->pool_lock);
+ clear_bit(irq - trig->subirq_base, trig->pool);
+ mutex_unlock(&trig->pool_lock);
+}
+
+/* Complexity in here. With certain triggers (datardy) an acknowledgement
+ * may be needed if the pollfuncs do not include the data read for the
+ * triggering device.
+ * This is not currently handled. Alternative of not enabling trigger unless
+ * the relevant function is in there may be the best option.
+ */
+/* Worth protecting against double additions?*/
+static int iio_trigger_attach_poll_func(struct iio_trigger *trig,
+ struct iio_poll_func *pf)
+{
+ int ret = 0;
+ bool notinuse
+ = bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
+
+ /* Prevent the module being removed whilst attached to a trigger */
+ __module_get(pf->indio_dev->info->driver_module);
+ pf->irq = iio_trigger_get_irq(trig);
+ ret = request_threaded_irq(pf->irq, pf->h, pf->thread,
+ pf->type, pf->name,
+ pf);
+ if (ret < 0) {
+ module_put(pf->indio_dev->info->driver_module);
+ return ret;
+ }
+
+ if (trig->ops && trig->ops->set_trigger_state && notinuse) {
+ ret = trig->ops->set_trigger_state(trig, true);
+ if (ret < 0)
+ module_put(pf->indio_dev->info->driver_module);
+ }
+
+ return ret;
+}
+
+static int iio_trigger_dettach_poll_func(struct iio_trigger *trig,
+ struct iio_poll_func *pf)
+{
+ int ret = 0;
+ bool no_other_users
+ = (bitmap_weight(trig->pool,
+ CONFIG_IIO_CONSUMERS_PER_TRIGGER)
+ == 1);
+ if (trig->ops && trig->ops->set_trigger_state && no_other_users) {
+ ret = trig->ops->set_trigger_state(trig, false);
+ if (ret)
+ goto error_ret;
+ }
+ iio_trigger_put_irq(trig, pf->irq);
+ free_irq(pf->irq, pf);
+ module_put(pf->indio_dev->info->driver_module);
+
+error_ret:
+ return ret;
+}
+
+irqreturn_t iio_pollfunc_store_time(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ pf->timestamp = iio_get_time_ns();
+ return IRQ_WAKE_THREAD;
+}
+EXPORT_SYMBOL(iio_pollfunc_store_time);
+
+struct iio_poll_func
+*iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p),
+ irqreturn_t (*thread)(int irq, void *p),
+ int type,
+ struct iio_dev *indio_dev,
+ const char *fmt,
+ ...)
+{
+ va_list vargs;
+ struct iio_poll_func *pf;
+
+ pf = kmalloc(sizeof *pf, GFP_KERNEL);
+ if (pf == NULL)
+ return NULL;
+ va_start(vargs, fmt);
+ pf->name = kvasprintf(GFP_KERNEL, fmt, vargs);
+ va_end(vargs);
+ if (pf->name == NULL) {
+ kfree(pf);
+ return NULL;
+ }
+ pf->h = h;
+ pf->thread = thread;
+ pf->type = type;
+ pf->indio_dev = indio_dev;
+
+ return pf;
+}
+EXPORT_SYMBOL_GPL(iio_alloc_pollfunc);
+
+void iio_dealloc_pollfunc(struct iio_poll_func *pf)
+{
+ kfree(pf->name);
+ kfree(pf);
+}
+EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc);
+
+/**
+ * iio_trigger_read_current() - trigger consumer sysfs query which trigger
+ *
+ * For trigger consumers the current_trigger interface allows the trigger
+ * used by the device to be queried.
+ **/
+static ssize_t iio_trigger_read_current(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+
+ if (indio_dev->trig)
+ return sprintf(buf, "%s\n", indio_dev->trig->name);
+ return 0;
+}
+
+/**
+ * iio_trigger_write_current() trigger consumer sysfs set current trigger
+ *
+ * For trigger consumers the current_trigger interface allows the trigger
+ * used for this device to be specified at run time based on the triggers
+ * name.
+ **/
+static ssize_t iio_trigger_write_current(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct iio_trigger *oldtrig = indio_dev->trig;
+ struct iio_trigger *trig;
+ int ret;
+
+ mutex_lock(&indio_dev->mlock);
+ if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
+ mutex_unlock(&indio_dev->mlock);
+ return -EBUSY;
+ }
+ mutex_unlock(&indio_dev->mlock);
+
+ trig = iio_trigger_find_by_name(buf, len);
+ if (oldtrig == trig)
+ return len;
+
+ if (trig && indio_dev->info->validate_trigger) {
+ ret = indio_dev->info->validate_trigger(indio_dev, trig);
+ if (ret)
+ return ret;
+ }
+
+ if (trig && trig->ops && trig->ops->validate_device) {
+ ret = trig->ops->validate_device(trig, indio_dev);
+ if (ret)
+ return ret;
+ }
+
+ indio_dev->trig = trig;
+
+ if (oldtrig && indio_dev->trig != oldtrig)
+ iio_put_trigger(oldtrig);
+ if (indio_dev->trig)
+ iio_get_trigger(indio_dev->trig);
+
+ return len;
+}
+
+static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR,
+ iio_trigger_read_current,
+ iio_trigger_write_current);
+
+static struct attribute *iio_trigger_consumer_attrs[] = {
+ &dev_attr_current_trigger.attr,
+ NULL,
+};
+
+static const struct attribute_group iio_trigger_consumer_attr_group = {
+ .name = "trigger",
+ .attrs = iio_trigger_consumer_attrs,
+};
+
+static void iio_trig_release(struct device *device)
+{
+ struct iio_trigger *trig = to_iio_trigger(device);
+ int i;
+
+ if (trig->subirq_base) {
+ for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
+ irq_modify_status(trig->subirq_base + i,
+ IRQ_NOAUTOEN,
+ IRQ_NOREQUEST | IRQ_NOPROBE);
+ irq_set_chip(trig->subirq_base + i,
+ NULL);
+ irq_set_handler(trig->subirq_base + i,
+ NULL);
+ }
+
+ irq_free_descs(trig->subirq_base,
+ CONFIG_IIO_CONSUMERS_PER_TRIGGER);
+ }
+ kfree(trig->name);
+ kfree(trig);
+}
+
+static struct device_type iio_trig_type = {
+ .release = iio_trig_release,
+};
+
+static void iio_trig_subirqmask(struct irq_data *d)
+{
+ struct irq_chip *chip = irq_data_get_irq_chip(d);
+ struct iio_trigger *trig
+ = container_of(chip,
+ struct iio_trigger, subirq_chip);
+ trig->subirqs[d->irq - trig->subirq_base].enabled = false;
+}
+
+static void iio_trig_subirqunmask(struct irq_data *d)
+{
+ struct irq_chip *chip = irq_data_get_irq_chip(d);
+ struct iio_trigger *trig
+ = container_of(chip,
+ struct iio_trigger, subirq_chip);
+ trig->subirqs[d->irq - trig->subirq_base].enabled = true;
+}
+
+struct iio_trigger *iio_allocate_trigger(const char *fmt, ...)
+{
+ va_list vargs;
+ struct iio_trigger *trig;
+ trig = kzalloc(sizeof *trig, GFP_KERNEL);
+ if (trig) {
+ int i;
+ trig->dev.type = &iio_trig_type;
+ trig->dev.bus = &iio_bus_type;
+ device_initialize(&trig->dev);
+ dev_set_drvdata(&trig->dev, (void *)trig);
+
+ mutex_init(&trig->pool_lock);
+ trig->subirq_base
+ = irq_alloc_descs(-1, 0,
+ CONFIG_IIO_CONSUMERS_PER_TRIGGER,
+ 0);
+ if (trig->subirq_base < 0) {
+ kfree(trig);
+ return NULL;
+ }
+ va_start(vargs, fmt);
+ trig->name = kvasprintf(GFP_KERNEL, fmt, vargs);
+ va_end(vargs);
+ if (trig->name == NULL) {
+ irq_free_descs(trig->subirq_base,
+ CONFIG_IIO_CONSUMERS_PER_TRIGGER);
+ kfree(trig);
+ return NULL;
+ }
+ trig->subirq_chip.name = trig->name;
+ trig->subirq_chip.irq_mask = &iio_trig_subirqmask;
+ trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask;
+ for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
+ irq_set_chip(trig->subirq_base + i,
+ &trig->subirq_chip);
+ irq_set_handler(trig->subirq_base + i,
+ &handle_simple_irq);
+ irq_modify_status(trig->subirq_base + i,
+ IRQ_NOREQUEST | IRQ_NOAUTOEN,
+ IRQ_NOPROBE);
+ }
+ get_device(&trig->dev);
+ }
+ return trig;
+}
+EXPORT_SYMBOL(iio_allocate_trigger);
+
+void iio_free_trigger(struct iio_trigger *trig)
+{
+ if (trig)
+ put_device(&trig->dev);
+}
+EXPORT_SYMBOL(iio_free_trigger);
+
+void iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
+{
+ indio_dev->groups[indio_dev->groupcounter++] =
+ &iio_trigger_consumer_attr_group;
+}
+
+void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
+{
+ /* Clean up and associated but not attached triggers references */
+ if (indio_dev->trig)
+ iio_put_trigger(indio_dev->trig);
+}
+
+int iio_triggered_buffer_postenable(struct iio_dev *indio_dev)
+{
+ return iio_trigger_attach_poll_func(indio_dev->trig,
+ indio_dev->pollfunc);
+}
+EXPORT_SYMBOL(iio_triggered_buffer_postenable);
+
+int iio_triggered_buffer_predisable(struct iio_dev *indio_dev)
+{
+ return iio_trigger_dettach_poll_func(indio_dev->trig,
+ indio_dev->pollfunc);
+}
+EXPORT_SYMBOL(iio_triggered_buffer_predisable);
--- /dev/null
+/* The industrial I/O core in kernel channel mapping
+ *
+ * Copyright (c) 2011 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+
+#include <linux/iio/iio.h>
+#include "iio_core.h"
+#include <linux/iio/machine.h>
+#include <linux/iio/driver.h>
+#include <linux/iio/consumer.h>
+
+struct iio_map_internal {
+ struct iio_dev *indio_dev;
+ struct iio_map *map;
+ struct list_head l;
+};
+
+static LIST_HEAD(iio_map_list);
+static DEFINE_MUTEX(iio_map_list_lock);
+
+int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps)
+{
+ int i = 0, ret = 0;
+ struct iio_map_internal *mapi;
+
+ if (maps == NULL)
+ return 0;
+
+ mutex_lock(&iio_map_list_lock);
+ while (maps[i].consumer_dev_name != NULL) {
+ mapi = kzalloc(sizeof(*mapi), GFP_KERNEL);
+ if (mapi == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ mapi->map = &maps[i];
+ mapi->indio_dev = indio_dev;
+ list_add(&mapi->l, &iio_map_list);
+ i++;
+ }
+error_ret:
+ mutex_unlock(&iio_map_list_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_map_array_register);
+
+
+/* Assumes the exact same array (e.g. memory locations)
+ * used at unregistration as used at registration rather than
+ * more complex checking of contents.
+ */
+int iio_map_array_unregister(struct iio_dev *indio_dev,
+ struct iio_map *maps)
+{
+ int i = 0, ret = 0;
+ bool found_it;
+ struct iio_map_internal *mapi;
+
+ if (maps == NULL)
+ return 0;
+
+ mutex_lock(&iio_map_list_lock);
+ while (maps[i].consumer_dev_name != NULL) {
+ found_it = false;
+ list_for_each_entry(mapi, &iio_map_list, l)
+ if (&maps[i] == mapi->map) {
+ list_del(&mapi->l);
+ kfree(mapi);
+ found_it = true;
+ break;
+ }
+ if (found_it == false) {
+ ret = -ENODEV;
+ goto error_ret;
+ }
+ }
+error_ret:
+ mutex_unlock(&iio_map_list_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_map_array_unregister);
+
+static const struct iio_chan_spec
+*iio_chan_spec_from_name(const struct iio_dev *indio_dev,
+ const char *name)
+{
+ int i;
+ const struct iio_chan_spec *chan = NULL;
+
+ for (i = 0; i < indio_dev->num_channels; i++)
+ if (indio_dev->channels[i].datasheet_name &&
+ strcmp(name, indio_dev->channels[i].datasheet_name) == 0) {
+ chan = &indio_dev->channels[i];
+ break;
+ }
+ return chan;
+}
+
+
+struct iio_channel *iio_st_channel_get(const char *name,
+ const char *channel_name)
+{
+ struct iio_map_internal *c_i = NULL, *c = NULL;
+ struct iio_channel *channel;
+
+ if (name == NULL && channel_name == NULL)
+ return ERR_PTR(-ENODEV);
+
+ /* first find matching entry the channel map */
+ mutex_lock(&iio_map_list_lock);
+ list_for_each_entry(c_i, &iio_map_list, l) {
+ if ((name && strcmp(name, c_i->map->consumer_dev_name) != 0) ||
+ (channel_name &&
+ strcmp(channel_name, c_i->map->consumer_channel) != 0))
+ continue;
+ c = c_i;
+ get_device(&c->indio_dev->dev);
+ break;
+ }
+ mutex_unlock(&iio_map_list_lock);
+ if (c == NULL)
+ return ERR_PTR(-ENODEV);
+
+ channel = kmalloc(sizeof(*channel), GFP_KERNEL);
+ if (channel == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ channel->indio_dev = c->indio_dev;
+
+ if (c->map->adc_channel_label)
+ channel->channel =
+ iio_chan_spec_from_name(channel->indio_dev,
+ c->map->adc_channel_label);
+
+ return channel;
+}
+EXPORT_SYMBOL_GPL(iio_st_channel_get);
+
+void iio_st_channel_release(struct iio_channel *channel)
+{
+ put_device(&channel->indio_dev->dev);
+ kfree(channel);
+}
+EXPORT_SYMBOL_GPL(iio_st_channel_release);
+
+struct iio_channel *iio_st_channel_get_all(const char *name)
+{
+ struct iio_channel *chans;
+ struct iio_map_internal *c = NULL;
+ int nummaps = 0;
+ int mapind = 0;
+ int i, ret;
+
+ if (name == NULL)
+ return ERR_PTR(-EINVAL);
+
+ mutex_lock(&iio_map_list_lock);
+ /* first count the matching maps */
+ list_for_each_entry(c, &iio_map_list, l)
+ if (name && strcmp(name, c->map->consumer_dev_name) != 0)
+ continue;
+ else
+ nummaps++;
+
+ if (nummaps == 0) {
+ ret = -ENODEV;
+ goto error_ret;
+ }
+
+ /* NULL terminated array to save passing size */
+ chans = kzalloc(sizeof(*chans)*(nummaps + 1), GFP_KERNEL);
+ if (chans == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ /* for each map fill in the chans element */
+ list_for_each_entry(c, &iio_map_list, l) {
+ if (name && strcmp(name, c->map->consumer_dev_name) != 0)
+ continue;
+ chans[mapind].indio_dev = c->indio_dev;
+ chans[mapind].channel =
+ iio_chan_spec_from_name(chans[mapind].indio_dev,
+ c->map->adc_channel_label);
+ if (chans[mapind].channel == NULL) {
+ ret = -EINVAL;
+ put_device(&chans[mapind].indio_dev->dev);
+ goto error_free_chans;
+ }
+ get_device(&chans[mapind].indio_dev->dev);
+ mapind++;
+ }
+ mutex_unlock(&iio_map_list_lock);
+ if (mapind == 0) {
+ ret = -ENODEV;
+ goto error_free_chans;
+ }
+ return chans;
+
+error_free_chans:
+ for (i = 0; i < nummaps; i++)
+ if (chans[i].indio_dev)
+ put_device(&chans[i].indio_dev->dev);
+ kfree(chans);
+error_ret:
+ mutex_unlock(&iio_map_list_lock);
+
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(iio_st_channel_get_all);
+
+void iio_st_channel_release_all(struct iio_channel *channels)
+{
+ struct iio_channel *chan = &channels[0];
+
+ while (chan->indio_dev) {
+ put_device(&chan->indio_dev->dev);
+ chan++;
+ }
+ kfree(channels);
+}
+EXPORT_SYMBOL_GPL(iio_st_channel_release_all);
+
+int iio_st_read_channel_raw(struct iio_channel *chan, int *val)
+{
+ int val2, ret;
+
+ mutex_lock(&chan->indio_dev->info_exist_lock);
+ if (chan->indio_dev->info == NULL) {
+ ret = -ENODEV;
+ goto err_unlock;
+ }
+
+ ret = chan->indio_dev->info->read_raw(chan->indio_dev, chan->channel,
+ val, &val2, 0);
+err_unlock:
+ mutex_unlock(&chan->indio_dev->info_exist_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_st_read_channel_raw);
+
+int iio_st_read_channel_scale(struct iio_channel *chan, int *val, int *val2)
+{
+ int ret;
+
+ mutex_lock(&chan->indio_dev->info_exist_lock);
+ if (chan->indio_dev->info == NULL) {
+ ret = -ENODEV;
+ goto err_unlock;
+ }
+
+ ret = chan->indio_dev->info->read_raw(chan->indio_dev,
+ chan->channel,
+ val, val2,
+ IIO_CHAN_INFO_SCALE);
+err_unlock:
+ mutex_unlock(&chan->indio_dev->info_exist_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_st_read_channel_scale);
+
+int iio_st_get_channel_type(struct iio_channel *chan,
+ enum iio_chan_type *type)
+{
+ int ret = 0;
+ /* Need to verify underlying driver has not gone away */
+
+ mutex_lock(&chan->indio_dev->info_exist_lock);
+ if (chan->indio_dev->info == NULL) {
+ ret = -ENODEV;
+ goto err_unlock;
+ }
+
+ *type = chan->channel->type;
+err_unlock:
+ mutex_unlock(&chan->indio_dev->info_exist_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_st_get_channel_type);
--- /dev/null
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/workqueue.h>
+#include <linux/kfifo.h>
+#include <linux/mutex.h>
+#include <linux/iio/kfifo_buf.h>
+
+struct iio_kfifo {
+ struct iio_buffer buffer;
+ struct kfifo kf;
+ int update_needed;
+};
+
+#define iio_to_kfifo(r) container_of(r, struct iio_kfifo, buffer)
+
+static inline int __iio_allocate_kfifo(struct iio_kfifo *buf,
+ int bytes_per_datum, int length)
+{
+ if ((length == 0) || (bytes_per_datum == 0))
+ return -EINVAL;
+
+ __iio_update_buffer(&buf->buffer, bytes_per_datum, length);
+ return kfifo_alloc(&buf->kf, bytes_per_datum*length, GFP_KERNEL);
+}
+
+static int iio_request_update_kfifo(struct iio_buffer *r)
+{
+ int ret = 0;
+ struct iio_kfifo *buf = iio_to_kfifo(r);
+
+ if (!buf->update_needed)
+ goto error_ret;
+ kfifo_free(&buf->kf);
+ ret = __iio_allocate_kfifo(buf, buf->buffer.bytes_per_datum,
+ buf->buffer.length);
+error_ret:
+ return ret;
+}
+
+static int iio_get_length_kfifo(struct iio_buffer *r)
+{
+ return r->length;
+}
+
+static IIO_BUFFER_ENABLE_ATTR;
+static IIO_BUFFER_LENGTH_ATTR;
+
+static struct attribute *iio_kfifo_attributes[] = {
+ &dev_attr_length.attr,
+ &dev_attr_enable.attr,
+ NULL,
+};
+
+static struct attribute_group iio_kfifo_attribute_group = {
+ .attrs = iio_kfifo_attributes,
+ .name = "buffer",
+};
+
+static int iio_get_bytes_per_datum_kfifo(struct iio_buffer *r)
+{
+ return r->bytes_per_datum;
+}
+
+static int iio_mark_update_needed_kfifo(struct iio_buffer *r)
+{
+ struct iio_kfifo *kf = iio_to_kfifo(r);
+ kf->update_needed = true;
+ return 0;
+}
+
+static int iio_set_bytes_per_datum_kfifo(struct iio_buffer *r, size_t bpd)
+{
+ if (r->bytes_per_datum != bpd) {
+ r->bytes_per_datum = bpd;
+ iio_mark_update_needed_kfifo(r);
+ }
+ return 0;
+}
+
+static int iio_set_length_kfifo(struct iio_buffer *r, int length)
+{
+ if (r->length != length) {
+ r->length = length;
+ iio_mark_update_needed_kfifo(r);
+ }
+ return 0;
+}
+
+static int iio_store_to_kfifo(struct iio_buffer *r,
+ u8 *data,
+ s64 timestamp)
+{
+ int ret;
+ struct iio_kfifo *kf = iio_to_kfifo(r);
+ ret = kfifo_in(&kf->kf, data, r->bytes_per_datum);
+ if (ret != r->bytes_per_datum)
+ return -EBUSY;
+ return 0;
+}
+
+static int iio_read_first_n_kfifo(struct iio_buffer *r,
+ size_t n, char __user *buf)
+{
+ int ret, copied;
+ struct iio_kfifo *kf = iio_to_kfifo(r);
+
+ if (n < r->bytes_per_datum)
+ return -EINVAL;
+
+ n = rounddown(n, r->bytes_per_datum);
+ ret = kfifo_to_user(&kf->kf, buf, n, &copied);
+
+ return copied;
+}
+
+static const struct iio_buffer_access_funcs kfifo_access_funcs = {
+ .store_to = &iio_store_to_kfifo,
+ .read_first_n = &iio_read_first_n_kfifo,
+ .request_update = &iio_request_update_kfifo,
+ .get_bytes_per_datum = &iio_get_bytes_per_datum_kfifo,
+ .set_bytes_per_datum = &iio_set_bytes_per_datum_kfifo,
+ .get_length = &iio_get_length_kfifo,
+ .set_length = &iio_set_length_kfifo,
+};
+
+struct iio_buffer *iio_kfifo_allocate(struct iio_dev *indio_dev)
+{
+ struct iio_kfifo *kf;
+
+ kf = kzalloc(sizeof *kf, GFP_KERNEL);
+ if (!kf)
+ return NULL;
+ kf->update_needed = true;
+ iio_buffer_init(&kf->buffer);
+ kf->buffer.attrs = &iio_kfifo_attribute_group;
+ kf->buffer.access = &kfifo_access_funcs;
+
+ return &kf->buffer;
+}
+EXPORT_SYMBOL(iio_kfifo_allocate);
+
+void iio_kfifo_free(struct iio_buffer *r)
+{
+ kfree(iio_to_kfifo(r));
+}
+EXPORT_SYMBOL(iio_kfifo_free);
+
+MODULE_LICENSE("GPL");
#
# Industrial I/O subsytem configuration
#
+menu "IIO staging drivers"
+ depends on IIO
-menuconfig IIO
- tristate "Industrial I/O support"
- depends on GENERIC_HARDIRQS
- help
- The industrial I/O subsystem provides a unified framework for
- drivers for many different types of embedded sensors using a
- number of different physical interfaces (i2c, spi, etc). See
- drivers/staging/iio/Documentation for more information.
-if IIO
config IIO_ST_HWMON
tristate "Hwmon driver that uses channels specified via iio maps"
depends on HWMON
map allows IIO devices to provide basic hwmon functionality
for those channels specified in the map.
-config IIO_BUFFER
- bool "Enable buffer support within IIO"
- help
- Provide core support for various buffer based data
- acquisition methods.
-
if IIO_BUFFER
config IIO_SW_RING
with the intention that some devices would be able to write
in interrupt context.
-config IIO_KFIFO_BUF
- select IIO_TRIGGER
- tristate "Industrial I/O buffering based on kfifo"
- help
- A simple fifo based on kfifo. Use this if you want a fifo
- rather than a ring buffer. Note that this currently provides
- no buffer events so it is up to userspace to work out how
- often to read from the buffer.
-
endif # IIO_BUFFER
-config IIO_TRIGGER
- boolean "Enable triggered sampling support"
- help
- Provides IIO core support for triggers. Currently these
- are used to initialize capture of samples to push into
- ring buffers. The triggers are effectively a 'capture
- data now' interrupt.
-
-config IIO_CONSUMERS_PER_TRIGGER
- int "Maximum number of consumers per trigger"
- depends on IIO_TRIGGER
- default "2"
- help
- This value controls the maximum number of consumers that a
- given trigger may handle. Default is 2.
-
source "drivers/staging/iio/accel/Kconfig"
source "drivers/staging/iio/adc/Kconfig"
source "drivers/staging/iio/addac/Kconfig"
endif # IIO_SIMPLE_DUMMY
-endif # IIO
+endmenu
# Makefile for the industrial I/O core.
#
-obj-$(CONFIG_IIO) += industrialio.o
-industrialio-y := industrialio-core.o industrialio-event.o inkern.o
-industrialio-$(CONFIG_IIO_BUFFER) += industrialio-buffer.o
-industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o
-
obj-$(CONFIG_IIO_SW_RING) += ring_sw.o
-obj-$(CONFIG_IIO_KFIFO_BUF) += kfifo_buf.o
obj-$(CONFIG_IIO_SIMPLE_DUMMY) += iio_dummy.o
iio_dummy-y := iio_simple_dummy.o
+++ /dev/null
-/* The industrial I/O core function defs.
- *
- * Copyright (c) 2008 Jonathan Cameron
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- * These definitions are meant for use only within the IIO core, not individual
- * drivers.
- */
-
-#ifndef _IIO_CORE_H_
-#define _IIO_CORE_H_
-#include <linux/kernel.h>
-#include <linux/device.h>
-
-struct iio_chan_spec;
-struct iio_dev;
-
-
-int __iio_add_chan_devattr(const char *postfix,
- struct iio_chan_spec const *chan,
- ssize_t (*func)(struct device *dev,
- struct device_attribute *attr,
- char *buf),
- ssize_t (*writefunc)(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len),
- u64 mask,
- bool generic,
- struct device *dev,
- struct list_head *attr_list);
-
-/* Event interface flags */
-#define IIO_BUSY_BIT_POS 1
-
-#ifdef CONFIG_IIO_BUFFER
-struct poll_table_struct;
-
-unsigned int iio_buffer_poll(struct file *filp,
- struct poll_table_struct *wait);
-ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
- size_t n, loff_t *f_ps);
-
-
-#define iio_buffer_poll_addr (&iio_buffer_poll)
-#define iio_buffer_read_first_n_outer_addr (&iio_buffer_read_first_n_outer)
-
-#else
-
-#define iio_buffer_poll_addr NULL
-#define iio_buffer_read_first_n_outer_addr NULL
-
-#endif
-
-int iio_device_register_eventset(struct iio_dev *indio_dev);
-void iio_device_unregister_eventset(struct iio_dev *indio_dev);
-int iio_event_getfd(struct iio_dev *indio_dev);
-
-#endif
+++ /dev/null
-
-/* The industrial I/O core, trigger consumer handling functions
- *
- * Copyright (c) 2008 Jonathan Cameron
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- */
-
-#ifdef CONFIG_IIO_TRIGGER
-/**
- * iio_device_register_trigger_consumer() - set up an iio_dev to use triggers
- * @indio_dev: iio_dev associated with the device that will consume the trigger
- **/
-void iio_device_register_trigger_consumer(struct iio_dev *indio_dev);
-
-/**
- * iio_device_unregister_trigger_consumer() - reverse the registration process
- * @indio_dev: iio_dev associated with the device that consumed the trigger
- **/
-void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev);
-
-#else
-
-/**
- * iio_device_register_trigger_consumer() - set up an iio_dev to use triggers
- * @indio_dev: iio_dev associated with the device that will consume the trigger
- **/
-static int iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
-{
- return 0;
-};
-
-/**
- * iio_device_unregister_trigger_consumer() - reverse the registration process
- * @indio_dev: iio_dev associated with the device that consumed the trigger
- **/
-static void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
-{
-};
-
-#endif /* CONFIG_TRIGGER_CONSUMER */
-
-
-
+++ /dev/null
-/* The industrial I/O core
- *
- * Copyright (c) 2008 Jonathan Cameron
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- * Handling of buffer allocation / resizing.
- *
- *
- * Things to look at here.
- * - Better memory allocation techniques?
- * - Alternative access techniques?
- */
-#include <linux/kernel.h>
-#include <linux/export.h>
-#include <linux/device.h>
-#include <linux/fs.h>
-#include <linux/cdev.h>
-#include <linux/slab.h>
-#include <linux/poll.h>
-
-#include <linux/iio/iio.h>
-#include "iio_core.h"
-#include <linux/iio/sysfs.h>
-#include <linux/iio/buffer.h>
-
-static const char * const iio_endian_prefix[] = {
- [IIO_BE] = "be",
- [IIO_LE] = "le",
-};
-
-/**
- * iio_buffer_read_first_n_outer() - chrdev read for buffer access
- *
- * This function relies on all buffer implementations having an
- * iio_buffer as their first element.
- **/
-ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf,
- size_t n, loff_t *f_ps)
-{
- struct iio_dev *indio_dev = filp->private_data;
- struct iio_buffer *rb = indio_dev->buffer;
-
- if (!rb || !rb->access->read_first_n)
- return -EINVAL;
- return rb->access->read_first_n(rb, n, buf);
-}
-
-/**
- * iio_buffer_poll() - poll the buffer to find out if it has data
- */
-unsigned int iio_buffer_poll(struct file *filp,
- struct poll_table_struct *wait)
-{
- struct iio_dev *indio_dev = filp->private_data;
- struct iio_buffer *rb = indio_dev->buffer;
-
- poll_wait(filp, &rb->pollq, wait);
- if (rb->stufftoread)
- return POLLIN | POLLRDNORM;
- /* need a way of knowing if there may be enough data... */
- return 0;
-}
-
-void iio_buffer_init(struct iio_buffer *buffer)
-{
- INIT_LIST_HEAD(&buffer->demux_list);
- init_waitqueue_head(&buffer->pollq);
-}
-EXPORT_SYMBOL(iio_buffer_init);
-
-static ssize_t iio_show_scan_index(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index);
-}
-
-static ssize_t iio_show_fixed_type(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- u8 type = this_attr->c->scan_type.endianness;
-
- if (type == IIO_CPU) {
-#ifdef __LITTLE_ENDIAN
- type = IIO_LE;
-#else
- type = IIO_BE;
-#endif
- }
- return sprintf(buf, "%s:%c%d/%d>>%u\n",
- iio_endian_prefix[type],
- this_attr->c->scan_type.sign,
- this_attr->c->scan_type.realbits,
- this_attr->c->scan_type.storagebits,
- this_attr->c->scan_type.shift);
-}
-
-static ssize_t iio_scan_el_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- int ret;
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
-
- ret = test_bit(to_iio_dev_attr(attr)->address,
- indio_dev->buffer->scan_mask);
-
- return sprintf(buf, "%d\n", ret);
-}
-
-static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit)
-{
- clear_bit(bit, buffer->scan_mask);
- return 0;
-}
-
-static ssize_t iio_scan_el_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- int ret;
- bool state;
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-
- ret = strtobool(buf, &state);
- if (ret < 0)
- return ret;
- mutex_lock(&indio_dev->mlock);
- if (iio_buffer_enabled(indio_dev)) {
- ret = -EBUSY;
- goto error_ret;
- }
- ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address);
- if (ret < 0)
- goto error_ret;
- if (!state && ret) {
- ret = iio_scan_mask_clear(buffer, this_attr->address);
- if (ret)
- goto error_ret;
- } else if (state && !ret) {
- ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address);
- if (ret)
- goto error_ret;
- }
-
-error_ret:
- mutex_unlock(&indio_dev->mlock);
-
- return ret < 0 ? ret : len;
-
-}
-
-static ssize_t iio_scan_el_ts_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp);
-}
-
-static ssize_t iio_scan_el_ts_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- int ret;
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- bool state;
-
- ret = strtobool(buf, &state);
- if (ret < 0)
- return ret;
-
- mutex_lock(&indio_dev->mlock);
- if (iio_buffer_enabled(indio_dev)) {
- ret = -EBUSY;
- goto error_ret;
- }
- indio_dev->buffer->scan_timestamp = state;
- indio_dev->scan_timestamp = state;
-error_ret:
- mutex_unlock(&indio_dev->mlock);
-
- return ret ? ret : len;
-}
-
-static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
- const struct iio_chan_spec *chan)
-{
- int ret, attrcount = 0;
- struct iio_buffer *buffer = indio_dev->buffer;
-
- ret = __iio_add_chan_devattr("index",
- chan,
- &iio_show_scan_index,
- NULL,
- 0,
- 0,
- &indio_dev->dev,
- &buffer->scan_el_dev_attr_list);
- if (ret)
- goto error_ret;
- attrcount++;
- ret = __iio_add_chan_devattr("type",
- chan,
- &iio_show_fixed_type,
- NULL,
- 0,
- 0,
- &indio_dev->dev,
- &buffer->scan_el_dev_attr_list);
- if (ret)
- goto error_ret;
- attrcount++;
- if (chan->type != IIO_TIMESTAMP)
- ret = __iio_add_chan_devattr("en",
- chan,
- &iio_scan_el_show,
- &iio_scan_el_store,
- chan->scan_index,
- 0,
- &indio_dev->dev,
- &buffer->scan_el_dev_attr_list);
- else
- ret = __iio_add_chan_devattr("en",
- chan,
- &iio_scan_el_ts_show,
- &iio_scan_el_ts_store,
- chan->scan_index,
- 0,
- &indio_dev->dev,
- &buffer->scan_el_dev_attr_list);
- attrcount++;
- ret = attrcount;
-error_ret:
- return ret;
-}
-
-static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev,
- struct iio_dev_attr *p)
-{
- kfree(p->dev_attr.attr.name);
- kfree(p);
-}
-
-static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev)
-{
- struct iio_dev_attr *p, *n;
- struct iio_buffer *buffer = indio_dev->buffer;
-
- list_for_each_entry_safe(p, n,
- &buffer->scan_el_dev_attr_list, l)
- iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p);
-}
-
-static const char * const iio_scan_elements_group_name = "scan_elements";
-
-int iio_buffer_register(struct iio_dev *indio_dev,
- const struct iio_chan_spec *channels,
- int num_channels)
-{
- struct iio_dev_attr *p;
- struct attribute **attr;
- struct iio_buffer *buffer = indio_dev->buffer;
- int ret, i, attrn, attrcount, attrcount_orig = 0;
-
- if (buffer->attrs)
- indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs;
-
- if (buffer->scan_el_attrs != NULL) {
- attr = buffer->scan_el_attrs->attrs;
- while (*attr++ != NULL)
- attrcount_orig++;
- }
- attrcount = attrcount_orig;
- INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list);
- if (channels) {
- /* new magic */
- for (i = 0; i < num_channels; i++) {
- /* Establish necessary mask length */
- if (channels[i].scan_index >
- (int)indio_dev->masklength - 1)
- indio_dev->masklength
- = indio_dev->channels[i].scan_index + 1;
-
- ret = iio_buffer_add_channel_sysfs(indio_dev,
- &channels[i]);
- if (ret < 0)
- goto error_cleanup_dynamic;
- attrcount += ret;
- if (channels[i].type == IIO_TIMESTAMP)
- indio_dev->scan_index_timestamp =
- channels[i].scan_index;
- }
- if (indio_dev->masklength && buffer->scan_mask == NULL) {
- buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength),
- sizeof(*buffer->scan_mask),
- GFP_KERNEL);
- if (buffer->scan_mask == NULL) {
- ret = -ENOMEM;
- goto error_cleanup_dynamic;
- }
- }
- }
-
- buffer->scan_el_group.name = iio_scan_elements_group_name;
-
- buffer->scan_el_group.attrs = kcalloc(attrcount + 1,
- sizeof(buffer->scan_el_group.attrs[0]),
- GFP_KERNEL);
- if (buffer->scan_el_group.attrs == NULL) {
- ret = -ENOMEM;
- goto error_free_scan_mask;
- }
- if (buffer->scan_el_attrs)
- memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs,
- sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig);
- attrn = attrcount_orig;
-
- list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l)
- buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr;
- indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group;
-
- return 0;
-
-error_free_scan_mask:
- kfree(buffer->scan_mask);
-error_cleanup_dynamic:
- __iio_buffer_attr_cleanup(indio_dev);
-
- return ret;
-}
-EXPORT_SYMBOL(iio_buffer_register);
-
-void iio_buffer_unregister(struct iio_dev *indio_dev)
-{
- kfree(indio_dev->buffer->scan_mask);
- kfree(indio_dev->buffer->scan_el_group.attrs);
- __iio_buffer_attr_cleanup(indio_dev);
-}
-EXPORT_SYMBOL(iio_buffer_unregister);
-
-ssize_t iio_buffer_read_length(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
-
- if (buffer->access->get_length)
- return sprintf(buf, "%d\n",
- buffer->access->get_length(buffer));
-
- return 0;
-}
-EXPORT_SYMBOL(iio_buffer_read_length);
-
-ssize_t iio_buffer_write_length(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- int ret;
- ulong val;
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
-
- ret = strict_strtoul(buf, 10, &val);
- if (ret)
- return ret;
-
- if (buffer->access->get_length)
- if (val == buffer->access->get_length(buffer))
- return len;
-
- mutex_lock(&indio_dev->mlock);
- if (iio_buffer_enabled(indio_dev)) {
- ret = -EBUSY;
- } else {
- if (buffer->access->set_length)
- buffer->access->set_length(buffer, val);
- ret = 0;
- }
- mutex_unlock(&indio_dev->mlock);
-
- return ret ? ret : len;
-}
-EXPORT_SYMBOL(iio_buffer_write_length);
-
-ssize_t iio_buffer_store_enable(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- int ret;
- bool requested_state, current_state;
- int previous_mode;
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_buffer *buffer = indio_dev->buffer;
-
- mutex_lock(&indio_dev->mlock);
- previous_mode = indio_dev->currentmode;
- requested_state = !(buf[0] == '0');
- current_state = iio_buffer_enabled(indio_dev);
- if (current_state == requested_state) {
- printk(KERN_INFO "iio-buffer, current state requested again\n");
- goto done;
- }
- if (requested_state) {
- if (indio_dev->setup_ops->preenable) {
- ret = indio_dev->setup_ops->preenable(indio_dev);
- if (ret) {
- printk(KERN_ERR
- "Buffer not started:"
- "buffer preenable failed\n");
- goto error_ret;
- }
- }
- if (buffer->access->request_update) {
- ret = buffer->access->request_update(buffer);
- if (ret) {
- printk(KERN_INFO
- "Buffer not started:"
- "buffer parameter update failed\n");
- goto error_ret;
- }
- }
- /* Definitely possible for devices to support both of these.*/
- if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) {
- if (!indio_dev->trig) {
- printk(KERN_INFO
- "Buffer not started: no trigger\n");
- ret = -EINVAL;
- goto error_ret;
- }
- indio_dev->currentmode = INDIO_BUFFER_TRIGGERED;
- } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE)
- indio_dev->currentmode = INDIO_BUFFER_HARDWARE;
- else { /* should never be reached */
- ret = -EINVAL;
- goto error_ret;
- }
-
- if (indio_dev->setup_ops->postenable) {
- ret = indio_dev->setup_ops->postenable(indio_dev);
- if (ret) {
- printk(KERN_INFO
- "Buffer not started:"
- "postenable failed\n");
- indio_dev->currentmode = previous_mode;
- if (indio_dev->setup_ops->postdisable)
- indio_dev->setup_ops->
- postdisable(indio_dev);
- goto error_ret;
- }
- }
- } else {
- if (indio_dev->setup_ops->predisable) {
- ret = indio_dev->setup_ops->predisable(indio_dev);
- if (ret)
- goto error_ret;
- }
- indio_dev->currentmode = INDIO_DIRECT_MODE;
- if (indio_dev->setup_ops->postdisable) {
- ret = indio_dev->setup_ops->postdisable(indio_dev);
- if (ret)
- goto error_ret;
- }
- }
-done:
- mutex_unlock(&indio_dev->mlock);
- return len;
-
-error_ret:
- mutex_unlock(&indio_dev->mlock);
- return ret;
-}
-EXPORT_SYMBOL(iio_buffer_store_enable);
-
-ssize_t iio_buffer_show_enable(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", iio_buffer_enabled(indio_dev));
-}
-EXPORT_SYMBOL(iio_buffer_show_enable);
-
-/* note NULL used as error indicator as it doesn't make sense. */
-static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks,
- unsigned int masklength,
- const unsigned long *mask)
-{
- if (bitmap_empty(mask, masklength))
- return NULL;
- while (*av_masks) {
- if (bitmap_subset(mask, av_masks, masklength))
- return av_masks;
- av_masks += BITS_TO_LONGS(masklength);
- }
- return NULL;
-}
-
-static int iio_compute_scan_bytes(struct iio_dev *indio_dev, const long *mask,
- bool timestamp)
-{
- const struct iio_chan_spec *ch;
- unsigned bytes = 0;
- int length, i;
-
- /* How much space will the demuxed element take? */
- for_each_set_bit(i, mask,
- indio_dev->masklength) {
- ch = iio_find_channel_from_si(indio_dev, i);
- length = ch->scan_type.storagebits / 8;
- bytes = ALIGN(bytes, length);
- bytes += length;
- }
- if (timestamp) {
- ch = iio_find_channel_from_si(indio_dev,
- indio_dev->scan_index_timestamp);
- length = ch->scan_type.storagebits / 8;
- bytes = ALIGN(bytes, length);
- bytes += length;
- }
- return bytes;
-}
-
-int iio_sw_buffer_preenable(struct iio_dev *indio_dev)
-{
- struct iio_buffer *buffer = indio_dev->buffer;
- dev_dbg(&indio_dev->dev, "%s\n", __func__);
-
- /* How much space will the demuxed element take? */
- indio_dev->scan_bytes =
- iio_compute_scan_bytes(indio_dev, buffer->scan_mask,
- buffer->scan_timestamp);
- buffer->access->set_bytes_per_datum(buffer, indio_dev->scan_bytes);
-
- /* What scan mask do we actually have ?*/
- if (indio_dev->available_scan_masks)
- indio_dev->active_scan_mask =
- iio_scan_mask_match(indio_dev->available_scan_masks,
- indio_dev->masklength,
- buffer->scan_mask);
- else
- indio_dev->active_scan_mask = buffer->scan_mask;
- iio_update_demux(indio_dev);
-
- if (indio_dev->info->update_scan_mode)
- return indio_dev->info
- ->update_scan_mode(indio_dev,
- indio_dev->active_scan_mask);
- return 0;
-}
-EXPORT_SYMBOL(iio_sw_buffer_preenable);
-
-/**
- * iio_scan_mask_set() - set particular bit in the scan mask
- * @buffer: the buffer whose scan mask we are interested in
- * @bit: the bit to be set.
- **/
-int iio_scan_mask_set(struct iio_dev *indio_dev,
- struct iio_buffer *buffer, int bit)
-{
- const unsigned long *mask;
- unsigned long *trialmask;
-
- trialmask = kmalloc(sizeof(*trialmask)*
- BITS_TO_LONGS(indio_dev->masklength),
- GFP_KERNEL);
-
- if (trialmask == NULL)
- return -ENOMEM;
- if (!indio_dev->masklength) {
- WARN_ON("trying to set scanmask prior to registering buffer\n");
- kfree(trialmask);
- return -EINVAL;
- }
- bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength);
- set_bit(bit, trialmask);
-
- if (indio_dev->available_scan_masks) {
- mask = iio_scan_mask_match(indio_dev->available_scan_masks,
- indio_dev->masklength,
- trialmask);
- if (!mask) {
- kfree(trialmask);
- return -EINVAL;
- }
- }
- bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength);
-
- kfree(trialmask);
-
- return 0;
-};
-EXPORT_SYMBOL_GPL(iio_scan_mask_set);
-
-int iio_scan_mask_query(struct iio_dev *indio_dev,
- struct iio_buffer *buffer, int bit)
-{
- if (bit > indio_dev->masklength)
- return -EINVAL;
-
- if (!buffer->scan_mask)
- return 0;
-
- return test_bit(bit, buffer->scan_mask);
-};
-EXPORT_SYMBOL_GPL(iio_scan_mask_query);
-
-/**
- * struct iio_demux_table() - table describing demux memcpy ops
- * @from: index to copy from
- * @to: index to copy to
- * @length: how many bytes to copy
- * @l: list head used for management
- */
-struct iio_demux_table {
- unsigned from;
- unsigned to;
- unsigned length;
- struct list_head l;
-};
-
-static unsigned char *iio_demux(struct iio_buffer *buffer,
- unsigned char *datain)
-{
- struct iio_demux_table *t;
-
- if (list_empty(&buffer->demux_list))
- return datain;
- list_for_each_entry(t, &buffer->demux_list, l)
- memcpy(buffer->demux_bounce + t->to,
- datain + t->from, t->length);
-
- return buffer->demux_bounce;
-}
-
-int iio_push_to_buffer(struct iio_buffer *buffer, unsigned char *data,
- s64 timestamp)
-{
- unsigned char *dataout = iio_demux(buffer, data);
-
- return buffer->access->store_to(buffer, dataout, timestamp);
-}
-EXPORT_SYMBOL_GPL(iio_push_to_buffer);
-
-static void iio_buffer_demux_free(struct iio_buffer *buffer)
-{
- struct iio_demux_table *p, *q;
- list_for_each_entry_safe(p, q, &buffer->demux_list, l) {
- list_del(&p->l);
- kfree(p);
- }
-}
-
-int iio_update_demux(struct iio_dev *indio_dev)
-{
- const struct iio_chan_spec *ch;
- struct iio_buffer *buffer = indio_dev->buffer;
- int ret, in_ind = -1, out_ind, length;
- unsigned in_loc = 0, out_loc = 0;
- struct iio_demux_table *p;
-
- /* Clear out any old demux */
- iio_buffer_demux_free(buffer);
- kfree(buffer->demux_bounce);
- buffer->demux_bounce = NULL;
-
- /* First work out which scan mode we will actually have */
- if (bitmap_equal(indio_dev->active_scan_mask,
- buffer->scan_mask,
- indio_dev->masklength))
- return 0;
-
- /* Now we have the two masks, work from least sig and build up sizes */
- for_each_set_bit(out_ind,
- indio_dev->active_scan_mask,
- indio_dev->masklength) {
- in_ind = find_next_bit(indio_dev->active_scan_mask,
- indio_dev->masklength,
- in_ind + 1);
- while (in_ind != out_ind) {
- in_ind = find_next_bit(indio_dev->active_scan_mask,
- indio_dev->masklength,
- in_ind + 1);
- ch = iio_find_channel_from_si(indio_dev, in_ind);
- length = ch->scan_type.storagebits/8;
- /* Make sure we are aligned */
- in_loc += length;
- if (in_loc % length)
- in_loc += length - in_loc % length;
- }
- p = kmalloc(sizeof(*p), GFP_KERNEL);
- if (p == NULL) {
- ret = -ENOMEM;
- goto error_clear_mux_table;
- }
- ch = iio_find_channel_from_si(indio_dev, in_ind);
- length = ch->scan_type.storagebits/8;
- if (out_loc % length)
- out_loc += length - out_loc % length;
- if (in_loc % length)
- in_loc += length - in_loc % length;
- p->from = in_loc;
- p->to = out_loc;
- p->length = length;
- list_add_tail(&p->l, &buffer->demux_list);
- out_loc += length;
- in_loc += length;
- }
- /* Relies on scan_timestamp being last */
- if (buffer->scan_timestamp) {
- p = kmalloc(sizeof(*p), GFP_KERNEL);
- if (p == NULL) {
- ret = -ENOMEM;
- goto error_clear_mux_table;
- }
- ch = iio_find_channel_from_si(indio_dev,
- indio_dev->scan_index_timestamp);
- length = ch->scan_type.storagebits/8;
- if (out_loc % length)
- out_loc += length - out_loc % length;
- if (in_loc % length)
- in_loc += length - in_loc % length;
- p->from = in_loc;
- p->to = out_loc;
- p->length = length;
- list_add_tail(&p->l, &buffer->demux_list);
- out_loc += length;
- in_loc += length;
- }
- buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL);
- if (buffer->demux_bounce == NULL) {
- ret = -ENOMEM;
- goto error_clear_mux_table;
- }
- return 0;
-
-error_clear_mux_table:
- iio_buffer_demux_free(buffer);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(iio_update_demux);
+++ /dev/null
-/* The industrial I/O core
- *
- * Copyright (c) 2008 Jonathan Cameron
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- * Based on elements of hwmon and input subsystems.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/idr.h>
-#include <linux/kdev_t.h>
-#include <linux/err.h>
-#include <linux/device.h>
-#include <linux/fs.h>
-#include <linux/poll.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
-#include <linux/cdev.h>
-#include <linux/slab.h>
-#include <linux/anon_inodes.h>
-#include <linux/debugfs.h>
-#include <linux/iio/iio.h>
-#include "iio_core.h"
-#include "iio_core_trigger.h"
-#include <linux/iio/sysfs.h>
-#include <linux/iio/events.h>
-
-/* IDA to assign each registered device a unique id*/
-static DEFINE_IDA(iio_ida);
-
-static dev_t iio_devt;
-
-#define IIO_DEV_MAX 256
-struct bus_type iio_bus_type = {
- .name = "iio",
-};
-EXPORT_SYMBOL(iio_bus_type);
-
-static struct dentry *iio_debugfs_dentry;
-
-static const char * const iio_direction[] = {
- [0] = "in",
- [1] = "out",
-};
-
-static const char * const iio_chan_type_name_spec[] = {
- [IIO_VOLTAGE] = "voltage",
- [IIO_CURRENT] = "current",
- [IIO_POWER] = "power",
- [IIO_ACCEL] = "accel",
- [IIO_ANGL_VEL] = "anglvel",
- [IIO_MAGN] = "magn",
- [IIO_LIGHT] = "illuminance",
- [IIO_INTENSITY] = "intensity",
- [IIO_PROXIMITY] = "proximity",
- [IIO_TEMP] = "temp",
- [IIO_INCLI] = "incli",
- [IIO_ROT] = "rot",
- [IIO_ANGL] = "angl",
- [IIO_TIMESTAMP] = "timestamp",
- [IIO_CAPACITANCE] = "capacitance",
-};
-
-static const char * const iio_modifier_names[] = {
- [IIO_MOD_X] = "x",
- [IIO_MOD_Y] = "y",
- [IIO_MOD_Z] = "z",
- [IIO_MOD_LIGHT_BOTH] = "both",
- [IIO_MOD_LIGHT_IR] = "ir",
-};
-
-/* relies on pairs of these shared then separate */
-static const char * const iio_chan_info_postfix[] = {
- [IIO_CHAN_INFO_RAW] = "raw",
- [IIO_CHAN_INFO_PROCESSED] = "input",
- [IIO_CHAN_INFO_SCALE] = "scale",
- [IIO_CHAN_INFO_OFFSET] = "offset",
- [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
- [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
- [IIO_CHAN_INFO_PEAK] = "peak_raw",
- [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
- [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
- [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
- [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
- = "filter_low_pass_3db_frequency",
- [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
-};
-
-const struct iio_chan_spec
-*iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
-{
- int i;
-
- for (i = 0; i < indio_dev->num_channels; i++)
- if (indio_dev->channels[i].scan_index == si)
- return &indio_dev->channels[i];
- return NULL;
-}
-
-/* This turns up an awful lot */
-ssize_t iio_read_const_attr(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
-}
-EXPORT_SYMBOL(iio_read_const_attr);
-
-static int __init iio_init(void)
-{
- int ret;
-
- /* Register sysfs bus */
- ret = bus_register(&iio_bus_type);
- if (ret < 0) {
- printk(KERN_ERR
- "%s could not register bus type\n",
- __FILE__);
- goto error_nothing;
- }
-
- ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
- if (ret < 0) {
- printk(KERN_ERR "%s: failed to allocate char dev region\n",
- __FILE__);
- goto error_unregister_bus_type;
- }
-
- iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
-
- return 0;
-
-error_unregister_bus_type:
- bus_unregister(&iio_bus_type);
-error_nothing:
- return ret;
-}
-
-static void __exit iio_exit(void)
-{
- if (iio_devt)
- unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
- bus_unregister(&iio_bus_type);
- debugfs_remove(iio_debugfs_dentry);
-}
-
-#if defined(CONFIG_DEBUG_FS)
-static int iio_debugfs_open(struct inode *inode, struct file *file)
-{
- if (inode->i_private)
- file->private_data = inode->i_private;
-
- return 0;
-}
-
-static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
- size_t count, loff_t *ppos)
-{
- struct iio_dev *indio_dev = file->private_data;
- char buf[20];
- unsigned val = 0;
- ssize_t len;
- int ret;
-
- ret = indio_dev->info->debugfs_reg_access(indio_dev,
- indio_dev->cached_reg_addr,
- 0, &val);
- if (ret)
- dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
-
- len = snprintf(buf, sizeof(buf), "0x%X\n", val);
-
- return simple_read_from_buffer(userbuf, count, ppos, buf, len);
-}
-
-static ssize_t iio_debugfs_write_reg(struct file *file,
- const char __user *userbuf, size_t count, loff_t *ppos)
-{
- struct iio_dev *indio_dev = file->private_data;
- unsigned reg, val;
- char buf[80];
- int ret;
-
- count = min_t(size_t, count, (sizeof(buf)-1));
- if (copy_from_user(buf, userbuf, count))
- return -EFAULT;
-
- buf[count] = 0;
-
- ret = sscanf(buf, "%i %i", ®, &val);
-
- switch (ret) {
- case 1:
- indio_dev->cached_reg_addr = reg;
- break;
- case 2:
- indio_dev->cached_reg_addr = reg;
- ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
- val, NULL);
- if (ret) {
- dev_err(indio_dev->dev.parent, "%s: write failed\n",
- __func__);
- return ret;
- }
- break;
- default:
- return -EINVAL;
- }
-
- return count;
-}
-
-static const struct file_operations iio_debugfs_reg_fops = {
- .open = iio_debugfs_open,
- .read = iio_debugfs_read_reg,
- .write = iio_debugfs_write_reg,
-};
-
-static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
-{
- debugfs_remove_recursive(indio_dev->debugfs_dentry);
-}
-
-static int iio_device_register_debugfs(struct iio_dev *indio_dev)
-{
- struct dentry *d;
-
- if (indio_dev->info->debugfs_reg_access == NULL)
- return 0;
-
- if (IS_ERR(iio_debugfs_dentry))
- return 0;
-
- indio_dev->debugfs_dentry =
- debugfs_create_dir(dev_name(&indio_dev->dev),
- iio_debugfs_dentry);
- if (IS_ERR(indio_dev->debugfs_dentry))
- return PTR_ERR(indio_dev->debugfs_dentry);
-
- if (indio_dev->debugfs_dentry == NULL) {
- dev_warn(indio_dev->dev.parent,
- "Failed to create debugfs directory\n");
- return -EFAULT;
- }
-
- d = debugfs_create_file("direct_reg_access", 0644,
- indio_dev->debugfs_dentry,
- indio_dev, &iio_debugfs_reg_fops);
- if (!d) {
- iio_device_unregister_debugfs(indio_dev);
- return -ENOMEM;
- }
-
- return 0;
-}
-#else
-static int iio_device_register_debugfs(struct iio_dev *indio_dev)
-{
- return 0;
-}
-
-static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
-{
-}
-#endif /* CONFIG_DEBUG_FS */
-
-static ssize_t iio_read_channel_ext_info(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- const struct iio_chan_spec_ext_info *ext_info;
-
- ext_info = &this_attr->c->ext_info[this_attr->address];
-
- return ext_info->read(indio_dev, this_attr->c, buf);
-}
-
-static ssize_t iio_write_channel_ext_info(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- const struct iio_chan_spec_ext_info *ext_info;
-
- ext_info = &this_attr->c->ext_info[this_attr->address];
-
- return ext_info->write(indio_dev, this_attr->c, buf, len);
-}
-
-static ssize_t iio_read_channel_info(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- int val, val2;
- int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
- &val, &val2, this_attr->address);
-
- if (ret < 0)
- return ret;
-
- if (ret == IIO_VAL_INT)
- return sprintf(buf, "%d\n", val);
- else if (ret == IIO_VAL_INT_PLUS_MICRO) {
- if (val2 < 0)
- return sprintf(buf, "-%d.%06u\n", val, -val2);
- else
- return sprintf(buf, "%d.%06u\n", val, val2);
- } else if (ret == IIO_VAL_INT_PLUS_NANO) {
- if (val2 < 0)
- return sprintf(buf, "-%d.%09u\n", val, -val2);
- else
- return sprintf(buf, "%d.%09u\n", val, val2);
- } else
- return 0;
-}
-
-static ssize_t iio_write_channel_info(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- int ret, integer = 0, fract = 0, fract_mult = 100000;
- bool integer_part = true, negative = false;
-
- /* Assumes decimal - precision based on number of digits */
- if (!indio_dev->info->write_raw)
- return -EINVAL;
-
- if (indio_dev->info->write_raw_get_fmt)
- switch (indio_dev->info->write_raw_get_fmt(indio_dev,
- this_attr->c, this_attr->address)) {
- case IIO_VAL_INT_PLUS_MICRO:
- fract_mult = 100000;
- break;
- case IIO_VAL_INT_PLUS_NANO:
- fract_mult = 100000000;
- break;
- default:
- return -EINVAL;
- }
-
- if (buf[0] == '-') {
- negative = true;
- buf++;
- }
-
- while (*buf) {
- if ('0' <= *buf && *buf <= '9') {
- if (integer_part)
- integer = integer*10 + *buf - '0';
- else {
- fract += fract_mult*(*buf - '0');
- if (fract_mult == 1)
- break;
- fract_mult /= 10;
- }
- } else if (*buf == '\n') {
- if (*(buf + 1) == '\0')
- break;
- else
- return -EINVAL;
- } else if (*buf == '.') {
- integer_part = false;
- } else {
- return -EINVAL;
- }
- buf++;
- }
- if (negative) {
- if (integer)
- integer = -integer;
- else
- fract = -fract;
- }
-
- ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
- integer, fract, this_attr->address);
- if (ret)
- return ret;
-
- return len;
-}
-
-static
-int __iio_device_attr_init(struct device_attribute *dev_attr,
- const char *postfix,
- struct iio_chan_spec const *chan,
- ssize_t (*readfunc)(struct device *dev,
- struct device_attribute *attr,
- char *buf),
- ssize_t (*writefunc)(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len),
- bool generic)
-{
- int ret;
- char *name_format, *full_postfix;
- sysfs_attr_init(&dev_attr->attr);
-
- /* Build up postfix of <extend_name>_<modifier>_postfix */
- if (chan->modified && !generic) {
- if (chan->extend_name)
- full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
- iio_modifier_names[chan
- ->channel2],
- chan->extend_name,
- postfix);
- else
- full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
- iio_modifier_names[chan
- ->channel2],
- postfix);
- } else {
- if (chan->extend_name == NULL)
- full_postfix = kstrdup(postfix, GFP_KERNEL);
- else
- full_postfix = kasprintf(GFP_KERNEL,
- "%s_%s",
- chan->extend_name,
- postfix);
- }
- if (full_postfix == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
-
- if (chan->differential) { /* Differential can not have modifier */
- if (generic)
- name_format
- = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
- iio_direction[chan->output],
- iio_chan_type_name_spec[chan->type],
- iio_chan_type_name_spec[chan->type],
- full_postfix);
- else if (chan->indexed)
- name_format
- = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s",
- iio_direction[chan->output],
- iio_chan_type_name_spec[chan->type],
- chan->channel,
- iio_chan_type_name_spec[chan->type],
- chan->channel2,
- full_postfix);
- else {
- WARN_ON("Differential channels must be indexed\n");
- ret = -EINVAL;
- goto error_free_full_postfix;
- }
- } else { /* Single ended */
- if (generic)
- name_format
- = kasprintf(GFP_KERNEL, "%s_%s_%s",
- iio_direction[chan->output],
- iio_chan_type_name_spec[chan->type],
- full_postfix);
- else if (chan->indexed)
- name_format
- = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
- iio_direction[chan->output],
- iio_chan_type_name_spec[chan->type],
- chan->channel,
- full_postfix);
- else
- name_format
- = kasprintf(GFP_KERNEL, "%s_%s_%s",
- iio_direction[chan->output],
- iio_chan_type_name_spec[chan->type],
- full_postfix);
- }
- if (name_format == NULL) {
- ret = -ENOMEM;
- goto error_free_full_postfix;
- }
- dev_attr->attr.name = kasprintf(GFP_KERNEL,
- name_format,
- chan->channel,
- chan->channel2);
- if (dev_attr->attr.name == NULL) {
- ret = -ENOMEM;
- goto error_free_name_format;
- }
-
- if (readfunc) {
- dev_attr->attr.mode |= S_IRUGO;
- dev_attr->show = readfunc;
- }
-
- if (writefunc) {
- dev_attr->attr.mode |= S_IWUSR;
- dev_attr->store = writefunc;
- }
- kfree(name_format);
- kfree(full_postfix);
-
- return 0;
-
-error_free_name_format:
- kfree(name_format);
-error_free_full_postfix:
- kfree(full_postfix);
-error_ret:
- return ret;
-}
-
-static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
-{
- kfree(dev_attr->attr.name);
-}
-
-int __iio_add_chan_devattr(const char *postfix,
- struct iio_chan_spec const *chan,
- ssize_t (*readfunc)(struct device *dev,
- struct device_attribute *attr,
- char *buf),
- ssize_t (*writefunc)(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len),
- u64 mask,
- bool generic,
- struct device *dev,
- struct list_head *attr_list)
-{
- int ret;
- struct iio_dev_attr *iio_attr, *t;
-
- iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL);
- if (iio_attr == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- ret = __iio_device_attr_init(&iio_attr->dev_attr,
- postfix, chan,
- readfunc, writefunc, generic);
- if (ret)
- goto error_iio_dev_attr_free;
- iio_attr->c = chan;
- iio_attr->address = mask;
- list_for_each_entry(t, attr_list, l)
- if (strcmp(t->dev_attr.attr.name,
- iio_attr->dev_attr.attr.name) == 0) {
- if (!generic)
- dev_err(dev, "tried to double register : %s\n",
- t->dev_attr.attr.name);
- ret = -EBUSY;
- goto error_device_attr_deinit;
- }
- list_add(&iio_attr->l, attr_list);
-
- return 0;
-
-error_device_attr_deinit:
- __iio_device_attr_deinit(&iio_attr->dev_attr);
-error_iio_dev_attr_free:
- kfree(iio_attr);
-error_ret:
- return ret;
-}
-
-static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan)
-{
- int ret, attrcount = 0;
- int i;
- const struct iio_chan_spec_ext_info *ext_info;
-
- if (chan->channel < 0)
- return 0;
- for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
- ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
- chan,
- &iio_read_channel_info,
- &iio_write_channel_info,
- i/2,
- !(i%2),
- &indio_dev->dev,
- &indio_dev->channel_attr_list);
- if (ret == -EBUSY && (i%2 == 0)) {
- ret = 0;
- continue;
- }
- if (ret < 0)
- goto error_ret;
- attrcount++;
- }
-
- if (chan->ext_info) {
- unsigned int i = 0;
- for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
- ret = __iio_add_chan_devattr(ext_info->name,
- chan,
- ext_info->read ?
- &iio_read_channel_ext_info : NULL,
- ext_info->write ?
- &iio_write_channel_ext_info : NULL,
- i,
- ext_info->shared,
- &indio_dev->dev,
- &indio_dev->channel_attr_list);
- i++;
- if (ret == -EBUSY && ext_info->shared)
- continue;
-
- if (ret)
- goto error_ret;
-
- attrcount++;
- }
- }
-
- ret = attrcount;
-error_ret:
- return ret;
-}
-
-static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev,
- struct iio_dev_attr *p)
-{
- kfree(p->dev_attr.attr.name);
- kfree(p);
-}
-
-static ssize_t iio_show_dev_name(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- return sprintf(buf, "%s\n", indio_dev->name);
-}
-
-static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
-
-static int iio_device_register_sysfs(struct iio_dev *indio_dev)
-{
- int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
- struct iio_dev_attr *p, *n;
- struct attribute **attr;
-
- /* First count elements in any existing group */
- if (indio_dev->info->attrs) {
- attr = indio_dev->info->attrs->attrs;
- while (*attr++ != NULL)
- attrcount_orig++;
- }
- attrcount = attrcount_orig;
- /*
- * New channel registration method - relies on the fact a group does
- * not need to be initialized if it is name is NULL.
- */
- INIT_LIST_HEAD(&indio_dev->channel_attr_list);
- if (indio_dev->channels)
- for (i = 0; i < indio_dev->num_channels; i++) {
- ret = iio_device_add_channel_sysfs(indio_dev,
- &indio_dev
- ->channels[i]);
- if (ret < 0)
- goto error_clear_attrs;
- attrcount += ret;
- }
-
- if (indio_dev->name)
- attrcount++;
-
- indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
- sizeof(indio_dev->chan_attr_group.attrs[0]),
- GFP_KERNEL);
- if (indio_dev->chan_attr_group.attrs == NULL) {
- ret = -ENOMEM;
- goto error_clear_attrs;
- }
- /* Copy across original attributes */
- if (indio_dev->info->attrs)
- memcpy(indio_dev->chan_attr_group.attrs,
- indio_dev->info->attrs->attrs,
- sizeof(indio_dev->chan_attr_group.attrs[0])
- *attrcount_orig);
- attrn = attrcount_orig;
- /* Add all elements from the list. */
- list_for_each_entry(p, &indio_dev->channel_attr_list, l)
- indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
- if (indio_dev->name)
- indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
-
- indio_dev->groups[indio_dev->groupcounter++] =
- &indio_dev->chan_attr_group;
-
- return 0;
-
-error_clear_attrs:
- list_for_each_entry_safe(p, n,
- &indio_dev->channel_attr_list, l) {
- list_del(&p->l);
- iio_device_remove_and_free_read_attr(indio_dev, p);
- }
-
- return ret;
-}
-
-static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
-{
-
- struct iio_dev_attr *p, *n;
-
- list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) {
- list_del(&p->l);
- iio_device_remove_and_free_read_attr(indio_dev, p);
- }
- kfree(indio_dev->chan_attr_group.attrs);
-}
-
-static void iio_dev_release(struct device *device)
-{
- struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev);
- cdev_del(&indio_dev->chrdev);
- if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
- iio_device_unregister_trigger_consumer(indio_dev);
- iio_device_unregister_eventset(indio_dev);
- iio_device_unregister_sysfs(indio_dev);
- iio_device_unregister_debugfs(indio_dev);
-}
-
-static struct device_type iio_dev_type = {
- .name = "iio_device",
- .release = iio_dev_release,
-};
-
-struct iio_dev *iio_allocate_device(int sizeof_priv)
-{
- struct iio_dev *dev;
- size_t alloc_size;
-
- alloc_size = sizeof(struct iio_dev);
- if (sizeof_priv) {
- alloc_size = ALIGN(alloc_size, IIO_ALIGN);
- alloc_size += sizeof_priv;
- }
- /* ensure 32-byte alignment of whole construct ? */
- alloc_size += IIO_ALIGN - 1;
-
- dev = kzalloc(alloc_size, GFP_KERNEL);
-
- if (dev) {
- dev->dev.groups = dev->groups;
- dev->dev.type = &iio_dev_type;
- dev->dev.bus = &iio_bus_type;
- device_initialize(&dev->dev);
- dev_set_drvdata(&dev->dev, (void *)dev);
- mutex_init(&dev->mlock);
- mutex_init(&dev->info_exist_lock);
-
- dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
- if (dev->id < 0) {
- /* cannot use a dev_err as the name isn't available */
- printk(KERN_ERR "Failed to get id\n");
- kfree(dev);
- return NULL;
- }
- dev_set_name(&dev->dev, "iio:device%d", dev->id);
- }
-
- return dev;
-}
-EXPORT_SYMBOL(iio_allocate_device);
-
-void iio_free_device(struct iio_dev *dev)
-{
- if (dev) {
- ida_simple_remove(&iio_ida, dev->id);
- kfree(dev);
- }
-}
-EXPORT_SYMBOL(iio_free_device);
-
-/**
- * iio_chrdev_open() - chrdev file open for buffer access and ioctls
- **/
-static int iio_chrdev_open(struct inode *inode, struct file *filp)
-{
- struct iio_dev *indio_dev = container_of(inode->i_cdev,
- struct iio_dev, chrdev);
-
- if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
- return -EBUSY;
-
- filp->private_data = indio_dev;
-
- return 0;
-}
-
-/**
- * iio_chrdev_release() - chrdev file close buffer access and ioctls
- **/
-static int iio_chrdev_release(struct inode *inode, struct file *filp)
-{
- struct iio_dev *indio_dev = container_of(inode->i_cdev,
- struct iio_dev, chrdev);
- clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
- return 0;
-}
-
-/* Somewhat of a cross file organization violation - ioctls here are actually
- * event related */
-static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
- struct iio_dev *indio_dev = filp->private_data;
- int __user *ip = (int __user *)arg;
- int fd;
-
- if (cmd == IIO_GET_EVENT_FD_IOCTL) {
- fd = iio_event_getfd(indio_dev);
- if (copy_to_user(ip, &fd, sizeof(fd)))
- return -EFAULT;
- return 0;
- }
- return -EINVAL;
-}
-
-static const struct file_operations iio_buffer_fileops = {
- .read = iio_buffer_read_first_n_outer_addr,
- .release = iio_chrdev_release,
- .open = iio_chrdev_open,
- .poll = iio_buffer_poll_addr,
- .owner = THIS_MODULE,
- .llseek = noop_llseek,
- .unlocked_ioctl = iio_ioctl,
- .compat_ioctl = iio_ioctl,
-};
-
-static const struct iio_buffer_setup_ops noop_ring_setup_ops;
-
-int iio_device_register(struct iio_dev *indio_dev)
-{
- int ret;
-
- /* configure elements for the chrdev */
- indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
-
- ret = iio_device_register_debugfs(indio_dev);
- if (ret) {
- dev_err(indio_dev->dev.parent,
- "Failed to register debugfs interfaces\n");
- goto error_ret;
- }
- ret = iio_device_register_sysfs(indio_dev);
- if (ret) {
- dev_err(indio_dev->dev.parent,
- "Failed to register sysfs interfaces\n");
- goto error_unreg_debugfs;
- }
- ret = iio_device_register_eventset(indio_dev);
- if (ret) {
- dev_err(indio_dev->dev.parent,
- "Failed to register event set\n");
- goto error_free_sysfs;
- }
- if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
- iio_device_register_trigger_consumer(indio_dev);
-
- if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
- indio_dev->setup_ops == NULL)
- indio_dev->setup_ops = &noop_ring_setup_ops;
-
- ret = device_add(&indio_dev->dev);
- if (ret < 0)
- goto error_unreg_eventset;
- cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
- indio_dev->chrdev.owner = indio_dev->info->driver_module;
- ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
- if (ret < 0)
- goto error_del_device;
- return 0;
-
-error_del_device:
- device_del(&indio_dev->dev);
-error_unreg_eventset:
- iio_device_unregister_eventset(indio_dev);
-error_free_sysfs:
- iio_device_unregister_sysfs(indio_dev);
-error_unreg_debugfs:
- iio_device_unregister_debugfs(indio_dev);
-error_ret:
- return ret;
-}
-EXPORT_SYMBOL(iio_device_register);
-
-void iio_device_unregister(struct iio_dev *indio_dev)
-{
- mutex_lock(&indio_dev->info_exist_lock);
- indio_dev->info = NULL;
- mutex_unlock(&indio_dev->info_exist_lock);
- device_unregister(&indio_dev->dev);
-}
-EXPORT_SYMBOL(iio_device_unregister);
-subsys_initcall(iio_init);
-module_exit(iio_exit);
-
-MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
-MODULE_DESCRIPTION("Industrial I/O core");
-MODULE_LICENSE("GPL");
+++ /dev/null
-/* Industrial I/O event handling
- *
- * Copyright (c) 2008 Jonathan Cameron
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- *
- * Based on elements of hwmon and input subsystems.
- */
-
-#include <linux/anon_inodes.h>
-#include <linux/device.h>
-#include <linux/fs.h>
-#include <linux/kernel.h>
-#include <linux/kfifo.h>
-#include <linux/module.h>
-#include <linux/poll.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-#include <linux/wait.h>
-#include <linux/iio/iio.h>
-#include "iio_core.h"
-#include <linux/iio/sysfs.h>
-#include <linux/iio/events.h>
-
-/**
- * struct iio_event_interface - chrdev interface for an event line
- * @wait: wait queue to allow blocking reads of events
- * @det_events: list of detected events
- * @dev_attr_list: list of event interface sysfs attribute
- * @flags: file operations related flags including busy flag.
- * @group: event interface sysfs attribute group
- */
-struct iio_event_interface {
- wait_queue_head_t wait;
- DECLARE_KFIFO(det_events, struct iio_event_data, 16);
-
- struct list_head dev_attr_list;
- unsigned long flags;
- struct attribute_group group;
-};
-
-int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
-{
- struct iio_event_interface *ev_int = indio_dev->event_interface;
- struct iio_event_data ev;
- int copied;
-
- /* Does anyone care? */
- spin_lock(&ev_int->wait.lock);
- if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
-
- ev.id = ev_code;
- ev.timestamp = timestamp;
-
- copied = kfifo_put(&ev_int->det_events, &ev);
- if (copied != 0)
- wake_up_locked_poll(&ev_int->wait, POLLIN);
- }
- spin_unlock(&ev_int->wait.lock);
-
- return 0;
-}
-EXPORT_SYMBOL(iio_push_event);
-
-/**
- * iio_event_poll() - poll the event queue to find out if it has data
- */
-static unsigned int iio_event_poll(struct file *filep,
- struct poll_table_struct *wait)
-{
- struct iio_event_interface *ev_int = filep->private_data;
- unsigned int events = 0;
-
- poll_wait(filep, &ev_int->wait, wait);
-
- spin_lock(&ev_int->wait.lock);
- if (!kfifo_is_empty(&ev_int->det_events))
- events = POLLIN | POLLRDNORM;
- spin_unlock(&ev_int->wait.lock);
-
- return events;
-}
-
-static ssize_t iio_event_chrdev_read(struct file *filep,
- char __user *buf,
- size_t count,
- loff_t *f_ps)
-{
- struct iio_event_interface *ev_int = filep->private_data;
- unsigned int copied;
- int ret;
-
- if (count < sizeof(struct iio_event_data))
- return -EINVAL;
-
- spin_lock(&ev_int->wait.lock);
- if (kfifo_is_empty(&ev_int->det_events)) {
- if (filep->f_flags & O_NONBLOCK) {
- ret = -EAGAIN;
- goto error_unlock;
- }
- /* Blocking on device; waiting for something to be there */
- ret = wait_event_interruptible_locked(ev_int->wait,
- !kfifo_is_empty(&ev_int->det_events));
- if (ret)
- goto error_unlock;
- /* Single access device so no one else can get the data */
- }
-
- ret = kfifo_to_user(&ev_int->det_events, buf, count, &copied);
-
-error_unlock:
- spin_unlock(&ev_int->wait.lock);
-
- return ret ? ret : copied;
-}
-
-static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
-{
- struct iio_event_interface *ev_int = filep->private_data;
-
- spin_lock(&ev_int->wait.lock);
- __clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
- /*
- * In order to maintain a clean state for reopening,
- * clear out any awaiting events. The mask will prevent
- * any new __iio_push_event calls running.
- */
- kfifo_reset_out(&ev_int->det_events);
- spin_unlock(&ev_int->wait.lock);
-
- return 0;
-}
-
-static const struct file_operations iio_event_chrdev_fileops = {
- .read = iio_event_chrdev_read,
- .poll = iio_event_poll,
- .release = iio_event_chrdev_release,
- .owner = THIS_MODULE,
- .llseek = noop_llseek,
-};
-
-int iio_event_getfd(struct iio_dev *indio_dev)
-{
- struct iio_event_interface *ev_int = indio_dev->event_interface;
- int fd;
-
- if (ev_int == NULL)
- return -ENODEV;
-
- spin_lock(&ev_int->wait.lock);
- if (__test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
- spin_unlock(&ev_int->wait.lock);
- return -EBUSY;
- }
- spin_unlock(&ev_int->wait.lock);
- fd = anon_inode_getfd("iio:event",
- &iio_event_chrdev_fileops, ev_int, O_RDONLY);
- if (fd < 0) {
- spin_lock(&ev_int->wait.lock);
- __clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
- spin_unlock(&ev_int->wait.lock);
- }
- return fd;
-}
-
-static const char * const iio_ev_type_text[] = {
- [IIO_EV_TYPE_THRESH] = "thresh",
- [IIO_EV_TYPE_MAG] = "mag",
- [IIO_EV_TYPE_ROC] = "roc",
- [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
- [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
-};
-
-static const char * const iio_ev_dir_text[] = {
- [IIO_EV_DIR_EITHER] = "either",
- [IIO_EV_DIR_RISING] = "rising",
- [IIO_EV_DIR_FALLING] = "falling"
-};
-
-static ssize_t iio_ev_state_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- int ret;
- bool val;
-
- ret = strtobool(buf, &val);
- if (ret < 0)
- return ret;
-
- ret = indio_dev->info->write_event_config(indio_dev,
- this_attr->address,
- val);
- return (ret < 0) ? ret : len;
-}
-
-static ssize_t iio_ev_state_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- int val = indio_dev->info->read_event_config(indio_dev,
- this_attr->address);
-
- if (val < 0)
- return val;
- else
- return sprintf(buf, "%d\n", val);
-}
-
-static ssize_t iio_ev_value_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- int val, ret;
-
- ret = indio_dev->info->read_event_value(indio_dev,
- this_attr->address, &val);
- if (ret < 0)
- return ret;
-
- return sprintf(buf, "%d\n", val);
-}
-
-static ssize_t iio_ev_value_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- unsigned long val;
- int ret;
-
- if (!indio_dev->info->write_event_value)
- return -EINVAL;
-
- ret = strict_strtoul(buf, 10, &val);
- if (ret)
- return ret;
-
- ret = indio_dev->info->write_event_value(indio_dev, this_attr->address,
- val);
- if (ret < 0)
- return ret;
-
- return len;
-}
-
-static int iio_device_add_event_sysfs(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan)
-{
- int ret = 0, i, attrcount = 0;
- u64 mask = 0;
- char *postfix;
- if (!chan->event_mask)
- return 0;
-
- for_each_set_bit(i, &chan->event_mask, sizeof(chan->event_mask)*8) {
- postfix = kasprintf(GFP_KERNEL, "%s_%s_en",
- iio_ev_type_text[i/IIO_EV_DIR_MAX],
- iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
- if (postfix == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- if (chan->modified)
- mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel,
- i/IIO_EV_DIR_MAX,
- i%IIO_EV_DIR_MAX);
- else if (chan->differential)
- mask = IIO_EVENT_CODE(chan->type,
- 0, 0,
- i%IIO_EV_DIR_MAX,
- i/IIO_EV_DIR_MAX,
- 0,
- chan->channel,
- chan->channel2);
- else
- mask = IIO_UNMOD_EVENT_CODE(chan->type,
- chan->channel,
- i/IIO_EV_DIR_MAX,
- i%IIO_EV_DIR_MAX);
-
- ret = __iio_add_chan_devattr(postfix,
- chan,
- &iio_ev_state_show,
- iio_ev_state_store,
- mask,
- 0,
- &indio_dev->dev,
- &indio_dev->event_interface->
- dev_attr_list);
- kfree(postfix);
- if (ret)
- goto error_ret;
- attrcount++;
- postfix = kasprintf(GFP_KERNEL, "%s_%s_value",
- iio_ev_type_text[i/IIO_EV_DIR_MAX],
- iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
- if (postfix == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- ret = __iio_add_chan_devattr(postfix, chan,
- iio_ev_value_show,
- iio_ev_value_store,
- mask,
- 0,
- &indio_dev->dev,
- &indio_dev->event_interface->
- dev_attr_list);
- kfree(postfix);
- if (ret)
- goto error_ret;
- attrcount++;
- }
- ret = attrcount;
-error_ret:
- return ret;
-}
-
-static inline void __iio_remove_event_config_attrs(struct iio_dev *indio_dev)
-{
- struct iio_dev_attr *p, *n;
- list_for_each_entry_safe(p, n,
- &indio_dev->event_interface->
- dev_attr_list, l) {
- kfree(p->dev_attr.attr.name);
- kfree(p);
- }
-}
-
-static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev)
-{
- int j, ret, attrcount = 0;
-
- INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
- /* Dynically created from the channels array */
- for (j = 0; j < indio_dev->num_channels; j++) {
- ret = iio_device_add_event_sysfs(indio_dev,
- &indio_dev->channels[j]);
- if (ret < 0)
- goto error_clear_attrs;
- attrcount += ret;
- }
- return attrcount;
-
-error_clear_attrs:
- __iio_remove_event_config_attrs(indio_dev);
-
- return ret;
-}
-
-static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)
-{
- int j;
-
- for (j = 0; j < indio_dev->num_channels; j++)
- if (indio_dev->channels[j].event_mask != 0)
- return true;
- return false;
-}
-
-static void iio_setup_ev_int(struct iio_event_interface *ev_int)
-{
- INIT_KFIFO(ev_int->det_events);
- init_waitqueue_head(&ev_int->wait);
-}
-
-static const char *iio_event_group_name = "events";
-int iio_device_register_eventset(struct iio_dev *indio_dev)
-{
- struct iio_dev_attr *p;
- int ret = 0, attrcount_orig = 0, attrcount, attrn;
- struct attribute **attr;
-
- if (!(indio_dev->info->event_attrs ||
- iio_check_for_dynamic_events(indio_dev)))
- return 0;
-
- indio_dev->event_interface =
- kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
- if (indio_dev->event_interface == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
-
- iio_setup_ev_int(indio_dev->event_interface);
- if (indio_dev->info->event_attrs != NULL) {
- attr = indio_dev->info->event_attrs->attrs;
- while (*attr++ != NULL)
- attrcount_orig++;
- }
- attrcount = attrcount_orig;
- if (indio_dev->channels) {
- ret = __iio_add_event_config_attrs(indio_dev);
- if (ret < 0)
- goto error_free_setup_event_lines;
- attrcount += ret;
- }
-
- indio_dev->event_interface->group.name = iio_event_group_name;
- indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1,
- sizeof(indio_dev->event_interface->group.attrs[0]),
- GFP_KERNEL);
- if (indio_dev->event_interface->group.attrs == NULL) {
- ret = -ENOMEM;
- goto error_free_setup_event_lines;
- }
- if (indio_dev->info->event_attrs)
- memcpy(indio_dev->event_interface->group.attrs,
- indio_dev->info->event_attrs->attrs,
- sizeof(indio_dev->event_interface->group.attrs[0])
- *attrcount_orig);
- attrn = attrcount_orig;
- /* Add all elements from the list. */
- list_for_each_entry(p,
- &indio_dev->event_interface->dev_attr_list,
- l)
- indio_dev->event_interface->group.attrs[attrn++] =
- &p->dev_attr.attr;
- indio_dev->groups[indio_dev->groupcounter++] =
- &indio_dev->event_interface->group;
-
- return 0;
-
-error_free_setup_event_lines:
- __iio_remove_event_config_attrs(indio_dev);
- kfree(indio_dev->event_interface);
-error_ret:
-
- return ret;
-}
-
-void iio_device_unregister_eventset(struct iio_dev *indio_dev)
-{
- if (indio_dev->event_interface == NULL)
- return;
- __iio_remove_event_config_attrs(indio_dev);
- kfree(indio_dev->event_interface->group.attrs);
- kfree(indio_dev->event_interface);
-}
+++ /dev/null
-/* The industrial I/O core, trigger handling functions
- *
- * Copyright (c) 2008 Jonathan Cameron
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- */
-
-#include <linux/kernel.h>
-#include <linux/idr.h>
-#include <linux/err.h>
-#include <linux/device.h>
-#include <linux/interrupt.h>
-#include <linux/list.h>
-#include <linux/slab.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/trigger.h>
-#include "iio_core.h"
-#include "iio_core_trigger.h"
-#include <linux/iio/trigger_consumer.h>
-
-/* RFC - Question of approach
- * Make the common case (single sensor single trigger)
- * simple by starting trigger capture from when first sensors
- * is added.
- *
- * Complex simultaneous start requires use of 'hold' functionality
- * of the trigger. (not implemented)
- *
- * Any other suggestions?
- */
-
-static DEFINE_IDA(iio_trigger_ida);
-
-/* Single list of all available triggers */
-static LIST_HEAD(iio_trigger_list);
-static DEFINE_MUTEX(iio_trigger_list_lock);
-
-/**
- * iio_trigger_read_name() - retrieve useful identifying name
- **/
-static ssize_t iio_trigger_read_name(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_trigger *trig = dev_get_drvdata(dev);
- return sprintf(buf, "%s\n", trig->name);
-}
-
-static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
-
-/**
- * iio_trigger_register_sysfs() - create a device for this trigger
- * @trig_info: the trigger
- *
- * Also adds any control attribute registered by the trigger driver
- **/
-static int iio_trigger_register_sysfs(struct iio_trigger *trig_info)
-{
- return sysfs_add_file_to_group(&trig_info->dev.kobj,
- &dev_attr_name.attr,
- NULL);
-}
-
-static void iio_trigger_unregister_sysfs(struct iio_trigger *trig_info)
-{
- sysfs_remove_file_from_group(&trig_info->dev.kobj,
- &dev_attr_name.attr,
- NULL);
-}
-
-int iio_trigger_register(struct iio_trigger *trig_info)
-{
- int ret;
-
- trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL);
- if (trig_info->id < 0) {
- ret = trig_info->id;
- goto error_ret;
- }
- /* Set the name used for the sysfs directory etc */
- dev_set_name(&trig_info->dev, "trigger%ld",
- (unsigned long) trig_info->id);
-
- ret = device_add(&trig_info->dev);
- if (ret)
- goto error_unregister_id;
-
- ret = iio_trigger_register_sysfs(trig_info);
- if (ret)
- goto error_device_del;
-
- /* Add to list of available triggers held by the IIO core */
- mutex_lock(&iio_trigger_list_lock);
- list_add_tail(&trig_info->list, &iio_trigger_list);
- mutex_unlock(&iio_trigger_list_lock);
-
- return 0;
-
-error_device_del:
- device_del(&trig_info->dev);
-error_unregister_id:
- ida_simple_remove(&iio_trigger_ida, trig_info->id);
-error_ret:
- return ret;
-}
-EXPORT_SYMBOL(iio_trigger_register);
-
-void iio_trigger_unregister(struct iio_trigger *trig_info)
-{
- mutex_lock(&iio_trigger_list_lock);
- list_del(&trig_info->list);
- mutex_unlock(&iio_trigger_list_lock);
-
- iio_trigger_unregister_sysfs(trig_info);
- ida_simple_remove(&iio_trigger_ida, trig_info->id);
- /* Possible issue in here */
- device_unregister(&trig_info->dev);
-}
-EXPORT_SYMBOL(iio_trigger_unregister);
-
-static struct iio_trigger *iio_trigger_find_by_name(const char *name,
- size_t len)
-{
- struct iio_trigger *trig = NULL, *iter;
-
- mutex_lock(&iio_trigger_list_lock);
- list_for_each_entry(iter, &iio_trigger_list, list)
- if (sysfs_streq(iter->name, name)) {
- trig = iter;
- break;
- }
- mutex_unlock(&iio_trigger_list_lock);
-
- return trig;
-}
-
-void iio_trigger_poll(struct iio_trigger *trig, s64 time)
-{
- int i;
- if (!trig->use_count)
- for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++)
- if (trig->subirqs[i].enabled) {
- trig->use_count++;
- generic_handle_irq(trig->subirq_base + i);
- }
-}
-EXPORT_SYMBOL(iio_trigger_poll);
-
-irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private)
-{
- iio_trigger_poll(private, iio_get_time_ns());
- return IRQ_HANDLED;
-}
-EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll);
-
-void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time)
-{
- int i;
- if (!trig->use_count)
- for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++)
- if (trig->subirqs[i].enabled) {
- trig->use_count++;
- handle_nested_irq(trig->subirq_base + i);
- }
-}
-EXPORT_SYMBOL(iio_trigger_poll_chained);
-
-void iio_trigger_notify_done(struct iio_trigger *trig)
-{
- trig->use_count--;
- if (trig->use_count == 0 && trig->ops && trig->ops->try_reenable)
- if (trig->ops->try_reenable(trig))
- /* Missed and interrupt so launch new poll now */
- iio_trigger_poll(trig, 0);
-}
-EXPORT_SYMBOL(iio_trigger_notify_done);
-
-/* Trigger Consumer related functions */
-static int iio_trigger_get_irq(struct iio_trigger *trig)
-{
- int ret;
- mutex_lock(&trig->pool_lock);
- ret = bitmap_find_free_region(trig->pool,
- CONFIG_IIO_CONSUMERS_PER_TRIGGER,
- ilog2(1));
- mutex_unlock(&trig->pool_lock);
- if (ret >= 0)
- ret += trig->subirq_base;
-
- return ret;
-}
-
-static void iio_trigger_put_irq(struct iio_trigger *trig, int irq)
-{
- mutex_lock(&trig->pool_lock);
- clear_bit(irq - trig->subirq_base, trig->pool);
- mutex_unlock(&trig->pool_lock);
-}
-
-/* Complexity in here. With certain triggers (datardy) an acknowledgement
- * may be needed if the pollfuncs do not include the data read for the
- * triggering device.
- * This is not currently handled. Alternative of not enabling trigger unless
- * the relevant function is in there may be the best option.
- */
-/* Worth protecting against double additions?*/
-static int iio_trigger_attach_poll_func(struct iio_trigger *trig,
- struct iio_poll_func *pf)
-{
- int ret = 0;
- bool notinuse
- = bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
-
- /* Prevent the module being removed whilst attached to a trigger */
- __module_get(pf->indio_dev->info->driver_module);
- pf->irq = iio_trigger_get_irq(trig);
- ret = request_threaded_irq(pf->irq, pf->h, pf->thread,
- pf->type, pf->name,
- pf);
- if (ret < 0) {
- module_put(pf->indio_dev->info->driver_module);
- return ret;
- }
-
- if (trig->ops && trig->ops->set_trigger_state && notinuse) {
- ret = trig->ops->set_trigger_state(trig, true);
- if (ret < 0)
- module_put(pf->indio_dev->info->driver_module);
- }
-
- return ret;
-}
-
-static int iio_trigger_dettach_poll_func(struct iio_trigger *trig,
- struct iio_poll_func *pf)
-{
- int ret = 0;
- bool no_other_users
- = (bitmap_weight(trig->pool,
- CONFIG_IIO_CONSUMERS_PER_TRIGGER)
- == 1);
- if (trig->ops && trig->ops->set_trigger_state && no_other_users) {
- ret = trig->ops->set_trigger_state(trig, false);
- if (ret)
- goto error_ret;
- }
- iio_trigger_put_irq(trig, pf->irq);
- free_irq(pf->irq, pf);
- module_put(pf->indio_dev->info->driver_module);
-
-error_ret:
- return ret;
-}
-
-irqreturn_t iio_pollfunc_store_time(int irq, void *p)
-{
- struct iio_poll_func *pf = p;
- pf->timestamp = iio_get_time_ns();
- return IRQ_WAKE_THREAD;
-}
-EXPORT_SYMBOL(iio_pollfunc_store_time);
-
-struct iio_poll_func
-*iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p),
- irqreturn_t (*thread)(int irq, void *p),
- int type,
- struct iio_dev *indio_dev,
- const char *fmt,
- ...)
-{
- va_list vargs;
- struct iio_poll_func *pf;
-
- pf = kmalloc(sizeof *pf, GFP_KERNEL);
- if (pf == NULL)
- return NULL;
- va_start(vargs, fmt);
- pf->name = kvasprintf(GFP_KERNEL, fmt, vargs);
- va_end(vargs);
- if (pf->name == NULL) {
- kfree(pf);
- return NULL;
- }
- pf->h = h;
- pf->thread = thread;
- pf->type = type;
- pf->indio_dev = indio_dev;
-
- return pf;
-}
-EXPORT_SYMBOL_GPL(iio_alloc_pollfunc);
-
-void iio_dealloc_pollfunc(struct iio_poll_func *pf)
-{
- kfree(pf->name);
- kfree(pf);
-}
-EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc);
-
-/**
- * iio_trigger_read_current() - trigger consumer sysfs query which trigger
- *
- * For trigger consumers the current_trigger interface allows the trigger
- * used by the device to be queried.
- **/
-static ssize_t iio_trigger_read_current(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
-
- if (indio_dev->trig)
- return sprintf(buf, "%s\n", indio_dev->trig->name);
- return 0;
-}
-
-/**
- * iio_trigger_write_current() trigger consumer sysfs set current trigger
- *
- * For trigger consumers the current_trigger interface allows the trigger
- * used for this device to be specified at run time based on the triggers
- * name.
- **/
-static ssize_t iio_trigger_write_current(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct iio_trigger *oldtrig = indio_dev->trig;
- struct iio_trigger *trig;
- int ret;
-
- mutex_lock(&indio_dev->mlock);
- if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
- mutex_unlock(&indio_dev->mlock);
- return -EBUSY;
- }
- mutex_unlock(&indio_dev->mlock);
-
- trig = iio_trigger_find_by_name(buf, len);
- if (oldtrig == trig)
- return len;
-
- if (trig && indio_dev->info->validate_trigger) {
- ret = indio_dev->info->validate_trigger(indio_dev, trig);
- if (ret)
- return ret;
- }
-
- if (trig && trig->ops && trig->ops->validate_device) {
- ret = trig->ops->validate_device(trig, indio_dev);
- if (ret)
- return ret;
- }
-
- indio_dev->trig = trig;
-
- if (oldtrig && indio_dev->trig != oldtrig)
- iio_put_trigger(oldtrig);
- if (indio_dev->trig)
- iio_get_trigger(indio_dev->trig);
-
- return len;
-}
-
-static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR,
- iio_trigger_read_current,
- iio_trigger_write_current);
-
-static struct attribute *iio_trigger_consumer_attrs[] = {
- &dev_attr_current_trigger.attr,
- NULL,
-};
-
-static const struct attribute_group iio_trigger_consumer_attr_group = {
- .name = "trigger",
- .attrs = iio_trigger_consumer_attrs,
-};
-
-static void iio_trig_release(struct device *device)
-{
- struct iio_trigger *trig = to_iio_trigger(device);
- int i;
-
- if (trig->subirq_base) {
- for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
- irq_modify_status(trig->subirq_base + i,
- IRQ_NOAUTOEN,
- IRQ_NOREQUEST | IRQ_NOPROBE);
- irq_set_chip(trig->subirq_base + i,
- NULL);
- irq_set_handler(trig->subirq_base + i,
- NULL);
- }
-
- irq_free_descs(trig->subirq_base,
- CONFIG_IIO_CONSUMERS_PER_TRIGGER);
- }
- kfree(trig->name);
- kfree(trig);
-}
-
-static struct device_type iio_trig_type = {
- .release = iio_trig_release,
-};
-
-static void iio_trig_subirqmask(struct irq_data *d)
-{
- struct irq_chip *chip = irq_data_get_irq_chip(d);
- struct iio_trigger *trig
- = container_of(chip,
- struct iio_trigger, subirq_chip);
- trig->subirqs[d->irq - trig->subirq_base].enabled = false;
-}
-
-static void iio_trig_subirqunmask(struct irq_data *d)
-{
- struct irq_chip *chip = irq_data_get_irq_chip(d);
- struct iio_trigger *trig
- = container_of(chip,
- struct iio_trigger, subirq_chip);
- trig->subirqs[d->irq - trig->subirq_base].enabled = true;
-}
-
-struct iio_trigger *iio_allocate_trigger(const char *fmt, ...)
-{
- va_list vargs;
- struct iio_trigger *trig;
- trig = kzalloc(sizeof *trig, GFP_KERNEL);
- if (trig) {
- int i;
- trig->dev.type = &iio_trig_type;
- trig->dev.bus = &iio_bus_type;
- device_initialize(&trig->dev);
- dev_set_drvdata(&trig->dev, (void *)trig);
-
- mutex_init(&trig->pool_lock);
- trig->subirq_base
- = irq_alloc_descs(-1, 0,
- CONFIG_IIO_CONSUMERS_PER_TRIGGER,
- 0);
- if (trig->subirq_base < 0) {
- kfree(trig);
- return NULL;
- }
- va_start(vargs, fmt);
- trig->name = kvasprintf(GFP_KERNEL, fmt, vargs);
- va_end(vargs);
- if (trig->name == NULL) {
- irq_free_descs(trig->subirq_base,
- CONFIG_IIO_CONSUMERS_PER_TRIGGER);
- kfree(trig);
- return NULL;
- }
- trig->subirq_chip.name = trig->name;
- trig->subirq_chip.irq_mask = &iio_trig_subirqmask;
- trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask;
- for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
- irq_set_chip(trig->subirq_base + i,
- &trig->subirq_chip);
- irq_set_handler(trig->subirq_base + i,
- &handle_simple_irq);
- irq_modify_status(trig->subirq_base + i,
- IRQ_NOREQUEST | IRQ_NOAUTOEN,
- IRQ_NOPROBE);
- }
- get_device(&trig->dev);
- }
- return trig;
-}
-EXPORT_SYMBOL(iio_allocate_trigger);
-
-void iio_free_trigger(struct iio_trigger *trig)
-{
- if (trig)
- put_device(&trig->dev);
-}
-EXPORT_SYMBOL(iio_free_trigger);
-
-void iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
-{
- indio_dev->groups[indio_dev->groupcounter++] =
- &iio_trigger_consumer_attr_group;
-}
-
-void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
-{
- /* Clean up and associated but not attached triggers references */
- if (indio_dev->trig)
- iio_put_trigger(indio_dev->trig);
-}
-
-int iio_triggered_buffer_postenable(struct iio_dev *indio_dev)
-{
- return iio_trigger_attach_poll_func(indio_dev->trig,
- indio_dev->pollfunc);
-}
-EXPORT_SYMBOL(iio_triggered_buffer_postenable);
-
-int iio_triggered_buffer_predisable(struct iio_dev *indio_dev)
-{
- return iio_trigger_dettach_poll_func(indio_dev->trig,
- indio_dev->pollfunc);
-}
-EXPORT_SYMBOL(iio_triggered_buffer_predisable);
+++ /dev/null
-/* The industrial I/O core in kernel channel mapping
- *
- * Copyright (c) 2011 Jonathan Cameron
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- */
-#include <linux/err.h>
-#include <linux/export.h>
-#include <linux/slab.h>
-#include <linux/mutex.h>
-
-#include <linux/iio/iio.h>
-#include "iio_core.h"
-#include <linux/iio/machine.h>
-#include <linux/iio/driver.h>
-#include <linux/iio/consumer.h>
-
-struct iio_map_internal {
- struct iio_dev *indio_dev;
- struct iio_map *map;
- struct list_head l;
-};
-
-static LIST_HEAD(iio_map_list);
-static DEFINE_MUTEX(iio_map_list_lock);
-
-int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps)
-{
- int i = 0, ret = 0;
- struct iio_map_internal *mapi;
-
- if (maps == NULL)
- return 0;
-
- mutex_lock(&iio_map_list_lock);
- while (maps[i].consumer_dev_name != NULL) {
- mapi = kzalloc(sizeof(*mapi), GFP_KERNEL);
- if (mapi == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- mapi->map = &maps[i];
- mapi->indio_dev = indio_dev;
- list_add(&mapi->l, &iio_map_list);
- i++;
- }
-error_ret:
- mutex_unlock(&iio_map_list_lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(iio_map_array_register);
-
-
-/* Assumes the exact same array (e.g. memory locations)
- * used at unregistration as used at registration rather than
- * more complex checking of contents.
- */
-int iio_map_array_unregister(struct iio_dev *indio_dev,
- struct iio_map *maps)
-{
- int i = 0, ret = 0;
- bool found_it;
- struct iio_map_internal *mapi;
-
- if (maps == NULL)
- return 0;
-
- mutex_lock(&iio_map_list_lock);
- while (maps[i].consumer_dev_name != NULL) {
- found_it = false;
- list_for_each_entry(mapi, &iio_map_list, l)
- if (&maps[i] == mapi->map) {
- list_del(&mapi->l);
- kfree(mapi);
- found_it = true;
- break;
- }
- if (found_it == false) {
- ret = -ENODEV;
- goto error_ret;
- }
- }
-error_ret:
- mutex_unlock(&iio_map_list_lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(iio_map_array_unregister);
-
-static const struct iio_chan_spec
-*iio_chan_spec_from_name(const struct iio_dev *indio_dev,
- const char *name)
-{
- int i;
- const struct iio_chan_spec *chan = NULL;
-
- for (i = 0; i < indio_dev->num_channels; i++)
- if (indio_dev->channels[i].datasheet_name &&
- strcmp(name, indio_dev->channels[i].datasheet_name) == 0) {
- chan = &indio_dev->channels[i];
- break;
- }
- return chan;
-}
-
-
-struct iio_channel *iio_st_channel_get(const char *name,
- const char *channel_name)
-{
- struct iio_map_internal *c_i = NULL, *c = NULL;
- struct iio_channel *channel;
-
- if (name == NULL && channel_name == NULL)
- return ERR_PTR(-ENODEV);
-
- /* first find matching entry the channel map */
- mutex_lock(&iio_map_list_lock);
- list_for_each_entry(c_i, &iio_map_list, l) {
- if ((name && strcmp(name, c_i->map->consumer_dev_name) != 0) ||
- (channel_name &&
- strcmp(channel_name, c_i->map->consumer_channel) != 0))
- continue;
- c = c_i;
- get_device(&c->indio_dev->dev);
- break;
- }
- mutex_unlock(&iio_map_list_lock);
- if (c == NULL)
- return ERR_PTR(-ENODEV);
-
- channel = kmalloc(sizeof(*channel), GFP_KERNEL);
- if (channel == NULL)
- return ERR_PTR(-ENOMEM);
-
- channel->indio_dev = c->indio_dev;
-
- if (c->map->adc_channel_label)
- channel->channel =
- iio_chan_spec_from_name(channel->indio_dev,
- c->map->adc_channel_label);
-
- return channel;
-}
-EXPORT_SYMBOL_GPL(iio_st_channel_get);
-
-void iio_st_channel_release(struct iio_channel *channel)
-{
- put_device(&channel->indio_dev->dev);
- kfree(channel);
-}
-EXPORT_SYMBOL_GPL(iio_st_channel_release);
-
-struct iio_channel *iio_st_channel_get_all(const char *name)
-{
- struct iio_channel *chans;
- struct iio_map_internal *c = NULL;
- int nummaps = 0;
- int mapind = 0;
- int i, ret;
-
- if (name == NULL)
- return ERR_PTR(-EINVAL);
-
- mutex_lock(&iio_map_list_lock);
- /* first count the matching maps */
- list_for_each_entry(c, &iio_map_list, l)
- if (name && strcmp(name, c->map->consumer_dev_name) != 0)
- continue;
- else
- nummaps++;
-
- if (nummaps == 0) {
- ret = -ENODEV;
- goto error_ret;
- }
-
- /* NULL terminated array to save passing size */
- chans = kzalloc(sizeof(*chans)*(nummaps + 1), GFP_KERNEL);
- if (chans == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
-
- /* for each map fill in the chans element */
- list_for_each_entry(c, &iio_map_list, l) {
- if (name && strcmp(name, c->map->consumer_dev_name) != 0)
- continue;
- chans[mapind].indio_dev = c->indio_dev;
- chans[mapind].channel =
- iio_chan_spec_from_name(chans[mapind].indio_dev,
- c->map->adc_channel_label);
- if (chans[mapind].channel == NULL) {
- ret = -EINVAL;
- put_device(&chans[mapind].indio_dev->dev);
- goto error_free_chans;
- }
- get_device(&chans[mapind].indio_dev->dev);
- mapind++;
- }
- mutex_unlock(&iio_map_list_lock);
- if (mapind == 0) {
- ret = -ENODEV;
- goto error_free_chans;
- }
- return chans;
-
-error_free_chans:
- for (i = 0; i < nummaps; i++)
- if (chans[i].indio_dev)
- put_device(&chans[i].indio_dev->dev);
- kfree(chans);
-error_ret:
- mutex_unlock(&iio_map_list_lock);
-
- return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(iio_st_channel_get_all);
-
-void iio_st_channel_release_all(struct iio_channel *channels)
-{
- struct iio_channel *chan = &channels[0];
-
- while (chan->indio_dev) {
- put_device(&chan->indio_dev->dev);
- chan++;
- }
- kfree(channels);
-}
-EXPORT_SYMBOL_GPL(iio_st_channel_release_all);
-
-int iio_st_read_channel_raw(struct iio_channel *chan, int *val)
-{
- int val2, ret;
-
- mutex_lock(&chan->indio_dev->info_exist_lock);
- if (chan->indio_dev->info == NULL) {
- ret = -ENODEV;
- goto err_unlock;
- }
-
- ret = chan->indio_dev->info->read_raw(chan->indio_dev, chan->channel,
- val, &val2, 0);
-err_unlock:
- mutex_unlock(&chan->indio_dev->info_exist_lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(iio_st_read_channel_raw);
-
-int iio_st_read_channel_scale(struct iio_channel *chan, int *val, int *val2)
-{
- int ret;
-
- mutex_lock(&chan->indio_dev->info_exist_lock);
- if (chan->indio_dev->info == NULL) {
- ret = -ENODEV;
- goto err_unlock;
- }
-
- ret = chan->indio_dev->info->read_raw(chan->indio_dev,
- chan->channel,
- val, val2,
- IIO_CHAN_INFO_SCALE);
-err_unlock:
- mutex_unlock(&chan->indio_dev->info_exist_lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(iio_st_read_channel_scale);
-
-int iio_st_get_channel_type(struct iio_channel *chan,
- enum iio_chan_type *type)
-{
- int ret = 0;
- /* Need to verify underlying driver has not gone away */
-
- mutex_lock(&chan->indio_dev->info_exist_lock);
- if (chan->indio_dev->info == NULL) {
- ret = -ENODEV;
- goto err_unlock;
- }
-
- *type = chan->channel->type;
-err_unlock:
- mutex_unlock(&chan->indio_dev->info_exist_lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(iio_st_get_channel_type);
+++ /dev/null
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/workqueue.h>
-#include <linux/kfifo.h>
-#include <linux/mutex.h>
-#include <linux/iio/kfifo_buf.h>
-
-struct iio_kfifo {
- struct iio_buffer buffer;
- struct kfifo kf;
- int update_needed;
-};
-
-#define iio_to_kfifo(r) container_of(r, struct iio_kfifo, buffer)
-
-static inline int __iio_allocate_kfifo(struct iio_kfifo *buf,
- int bytes_per_datum, int length)
-{
- if ((length == 0) || (bytes_per_datum == 0))
- return -EINVAL;
-
- __iio_update_buffer(&buf->buffer, bytes_per_datum, length);
- return kfifo_alloc(&buf->kf, bytes_per_datum*length, GFP_KERNEL);
-}
-
-static int iio_request_update_kfifo(struct iio_buffer *r)
-{
- int ret = 0;
- struct iio_kfifo *buf = iio_to_kfifo(r);
-
- if (!buf->update_needed)
- goto error_ret;
- kfifo_free(&buf->kf);
- ret = __iio_allocate_kfifo(buf, buf->buffer.bytes_per_datum,
- buf->buffer.length);
-error_ret:
- return ret;
-}
-
-static int iio_get_length_kfifo(struct iio_buffer *r)
-{
- return r->length;
-}
-
-static IIO_BUFFER_ENABLE_ATTR;
-static IIO_BUFFER_LENGTH_ATTR;
-
-static struct attribute *iio_kfifo_attributes[] = {
- &dev_attr_length.attr,
- &dev_attr_enable.attr,
- NULL,
-};
-
-static struct attribute_group iio_kfifo_attribute_group = {
- .attrs = iio_kfifo_attributes,
- .name = "buffer",
-};
-
-static int iio_get_bytes_per_datum_kfifo(struct iio_buffer *r)
-{
- return r->bytes_per_datum;
-}
-
-static int iio_mark_update_needed_kfifo(struct iio_buffer *r)
-{
- struct iio_kfifo *kf = iio_to_kfifo(r);
- kf->update_needed = true;
- return 0;
-}
-
-static int iio_set_bytes_per_datum_kfifo(struct iio_buffer *r, size_t bpd)
-{
- if (r->bytes_per_datum != bpd) {
- r->bytes_per_datum = bpd;
- iio_mark_update_needed_kfifo(r);
- }
- return 0;
-}
-
-static int iio_set_length_kfifo(struct iio_buffer *r, int length)
-{
- if (r->length != length) {
- r->length = length;
- iio_mark_update_needed_kfifo(r);
- }
- return 0;
-}
-
-static int iio_store_to_kfifo(struct iio_buffer *r,
- u8 *data,
- s64 timestamp)
-{
- int ret;
- struct iio_kfifo *kf = iio_to_kfifo(r);
- ret = kfifo_in(&kf->kf, data, r->bytes_per_datum);
- if (ret != r->bytes_per_datum)
- return -EBUSY;
- return 0;
-}
-
-static int iio_read_first_n_kfifo(struct iio_buffer *r,
- size_t n, char __user *buf)
-{
- int ret, copied;
- struct iio_kfifo *kf = iio_to_kfifo(r);
-
- if (n < r->bytes_per_datum)
- return -EINVAL;
-
- n = rounddown(n, r->bytes_per_datum);
- ret = kfifo_to_user(&kf->kf, buf, n, &copied);
-
- return copied;
-}
-
-static const struct iio_buffer_access_funcs kfifo_access_funcs = {
- .store_to = &iio_store_to_kfifo,
- .read_first_n = &iio_read_first_n_kfifo,
- .request_update = &iio_request_update_kfifo,
- .get_bytes_per_datum = &iio_get_bytes_per_datum_kfifo,
- .set_bytes_per_datum = &iio_set_bytes_per_datum_kfifo,
- .get_length = &iio_get_length_kfifo,
- .set_length = &iio_set_length_kfifo,
-};
-
-struct iio_buffer *iio_kfifo_allocate(struct iio_dev *indio_dev)
-{
- struct iio_kfifo *kf;
-
- kf = kzalloc(sizeof *kf, GFP_KERNEL);
- if (!kf)
- return NULL;
- kf->update_needed = true;
- iio_buffer_init(&kf->buffer);
- kf->buffer.attrs = &iio_kfifo_attribute_group;
- kf->buffer.access = &kfifo_access_funcs;
-
- return &kf->buffer;
-}
-EXPORT_SYMBOL(iio_kfifo_allocate);
-
-void iio_kfifo_free(struct iio_buffer *r)
-{
- kfree(iio_to_kfifo(r));
-}
-EXPORT_SYMBOL(iio_kfifo_free);
-
-MODULE_LICENSE("GPL");
projects / ~shefty / rdma-dev.git / commitdiff