From 4bc19f62c57b8ccdd1c48e875752bd59abfb7aae Mon Sep 17 00:00:00 2001 From: David Herrmann Date: Fri, 20 Jul 2012 11:49:09 +0200 Subject: [PATCH] HID: Allow drivers to be their own listener hid-picolcd and hid-wiimote do not allow any of hidinput, hiddev or hidraw to claim the device but still want to remain on the bus. Hence, if a driver uses the raw_event callback but no other listener claimed the device, we still leave it on the bus as the driver handles everything by itself. It thus becomes its own listener. Under some circumstances (eg., hidinput_connect() fails and raw_event set) a device may be left on the bus even though it requires external listeners. But then if hidinput_connect() fails there are bigger issues than a device that is left unhandled. So we can safely use this heuristic to avoid adding another flag for special devices like hid-picolcd and hid-wiimote. This also removes the ugly hack from hid-picolcd as this is no longer required. Signed-off-by: David Herrmann Acked-by: Henrik Rydberg Signed-off-by: Jiri Kosina --- drivers/hid/hid-core.c | 6 ++++-- drivers/hid/hid-picolcd.c | 4 ---- 2 files changed, 4 insertions(+), 6 deletions(-) diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index ba1c3644e6a..de8220c3fb5 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1373,8 +1373,10 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask) if ((connect_mask & HID_CONNECT_HIDRAW) && !hidraw_connect(hdev)) hdev->claimed |= HID_CLAIMED_HIDRAW; - if (!hdev->claimed) { - hid_err(hdev, "claimed by neither input, hiddev nor hidraw\n"); + /* Drivers with the ->raw_event callback set are not required to connect + * to any other listener. */ + if (!hdev->claimed && !hdev->driver->raw_event) { + hid_err(hdev, "device has no listeners, quitting\n"); return -ENODEV; } diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c index 45c3433f798..74c388dcb5b 100644 --- a/drivers/hid/hid-picolcd.c +++ b/drivers/hid/hid-picolcd.c @@ -2613,11 +2613,7 @@ static int picolcd_probe(struct hid_device *hdev, goto err_cleanup_data; } - /* We don't use hidinput but hid_hw_start() fails if nothing is - * claimed. So spoof claimed input. */ - hdev->claimed = HID_CLAIMED_INPUT; error = hid_hw_start(hdev, 0); - hdev->claimed = 0; if (error) { hid_err(hdev, "hardware start failed\n"); goto err_cleanup_data; -- 2.46.0