From 20d5f116ec777c9c7ce5b74f0d17ee1d01a0d833 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Thu, 25 Mar 2010 23:49:46 -0300 Subject: [PATCH] V4L/DVB: ir-nec-decoder: Add sysfs node to enable/disable per irrcv With the help of raw_register/raw_unregister, adds a sysfs group associated with the decoder, inside the corresponding irrcv node. Writing 1 to nec_decoder/enabled enables the decoder, while writing 0 disables it. Signed-off-by: Mauro Carvalho Chehab --- drivers/media/IR/ir-nec-decoder.c | 133 +++++++++++++++++++++++++++++- drivers/media/IR/ir-raw-event.c | 2 +- 2 files changed, 133 insertions(+), 2 deletions(-) diff --git a/drivers/media/IR/ir-nec-decoder.c b/drivers/media/IR/ir-nec-decoder.c index cb57cc28773..83a9912722f 100644 --- a/drivers/media/IR/ir-nec-decoder.c +++ b/drivers/media/IR/ir-nec-decoder.c @@ -39,6 +39,85 @@ #define REPEAT_TIME 240 /* ms */ +/* Used to register nec_decoder clients */ +static LIST_HEAD(decoder_list); +static spinlock_t decoder_lock; + +struct decoder_data { + struct list_head list; + struct ir_input_dev *ir_dev; + int enabled:1; +}; + + +/** + * get_decoder_data() - gets decoder data + * @input_dev: input device + * + * Returns the struct decoder_data that corresponds to a device + */ + +static struct decoder_data *get_decoder_data(struct ir_input_dev *ir_dev) +{ + struct decoder_data *data = NULL; + + spin_lock(&decoder_lock); + list_for_each_entry(data, &decoder_list, list) { + if (data->ir_dev == ir_dev) + break; + } + spin_unlock(&decoder_lock); + return data; +} + +static ssize_t store_enabled(struct device *d, + struct device_attribute *mattr, + const char *buf, + size_t len) +{ + unsigned long value; + struct ir_input_dev *ir_dev = dev_get_drvdata(d); + struct decoder_data *data = get_decoder_data(ir_dev); + + if (!data) + return -EINVAL; + + if (strict_strtoul(buf, 10, &value) || value > 1) + return -EINVAL; + + data->enabled = value; + + return len; +} + +static ssize_t show_enabled(struct device *d, + struct device_attribute *mattr, char *buf) +{ + struct ir_input_dev *ir_dev = dev_get_drvdata(d); + struct decoder_data *data = get_decoder_data(ir_dev); + + if (!data) + return -EINVAL; + + if (data->enabled) + return sprintf(buf, "1\n"); + else + return sprintf(buf, "0\n"); +} + +static DEVICE_ATTR(enabled, S_IRUGO | S_IWUSR, show_enabled, store_enabled); + +static struct attribute *decoder_attributes[] = { + &dev_attr_enabled.attr, + NULL +}; + +static struct attribute_group decoder_attribute_group = { + .name = "nec_decoder", + .attrs = decoder_attributes, +}; + + /** is_repeat - Check if it is a NEC repeat event * @input_dev: the struct input_dev descriptor of the device * @pos: the position of the first event @@ -184,9 +263,15 @@ static int ir_nec_decode(struct input_dev *input_dev, struct ir_raw_event *evs, int len) { + struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); + struct decoder_data *data; int pos = 0; int rc = 0; + data = get_decoder_data(ir_dev); + if (!data || !data->enabled) + return 0; + while (pos < len) { if (__ir_nec_decode(input_dev, evs, len, &pos) > 0) rc++; @@ -194,8 +279,54 @@ static int ir_nec_decode(struct input_dev *input_dev, return rc; } +static int ir_nec_register(struct input_dev *input_dev) +{ + struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); + struct decoder_data *data; + int rc; + + rc = sysfs_create_group(&ir_dev->dev.kobj, &decoder_attribute_group); + if (rc < 0) + return rc; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) { + sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group); + return -ENOMEM; + } + + data->ir_dev = ir_dev; + data->enabled = 1; + + spin_lock(&decoder_lock); + list_add_tail(&data->list, &decoder_list); + spin_unlock(&decoder_lock); + + return 0; +} + +static int ir_nec_unregister(struct input_dev *input_dev) +{ + struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); + static struct decoder_data *data; + + data = get_decoder_data(ir_dev); + if (!data) + return 0; + + sysfs_remove_group(&ir_dev->dev.kobj, &decoder_attribute_group); + + spin_lock(&decoder_lock); + list_del(&data->list); + spin_unlock(&decoder_lock); + + return 0; +} + static struct ir_raw_handler nec_handler = { - .decode = ir_nec_decode, + .decode = ir_nec_decode, + .raw_register = ir_nec_register, + .raw_unregister = ir_nec_unregister, }; static int __init ir_nec_decode_init(void) diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c index 11f23f4491b..371d88e5a58 100644 --- a/drivers/media/IR/ir-raw-event.c +++ b/drivers/media/IR/ir-raw-event.c @@ -223,7 +223,7 @@ static void init_decoders(struct work_struct *work) void ir_raw_init(void) { spin_lock_init(&ir_raw_handler_lock); - + #ifdef MODULE INIT_WORK(&wq_load, init_decoders); schedule_work(&wq_load); -- 2.46.0