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media: uvcvideo: Only create input devs if hw supports it

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Examine the stream headers to figure out if the device has a button and
can be used as an input.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Ricardo Ribalda 2022-09-20 16:09:50 +02:00 committed by Laurent Pinchart
parent 41ddb251c6
commit 3bc22dc66a
1 changed files with 23 additions and 0 deletions
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23
drivers/media/usb/uvc/uvc_status.c
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@ -18,11 +18,34 @@
* Input device * Input device
*/ */
#ifdef CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV #ifdef CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV
static bool uvc_input_has_button(struct uvc_device *dev)
{
struct uvc_streaming *stream;
/*
* The device has button events if both bTriggerSupport and
* bTriggerUsage are one. Otherwise the camera button does not
* exist or is handled automatically by the camera without host
* driver or client application intervention.
*/
list_for_each_entry(stream, &dev->streams, list) {
if (stream->header.bTriggerSupport == 1 &&
stream->header.bTriggerUsage == 1)
return true;
}
return false;
}
static int uvc_input_init(struct uvc_device *dev) static int uvc_input_init(struct uvc_device *dev)
{ {
struct input_dev *input; struct input_dev *input;
int ret; int ret;
if (!uvc_input_has_button(dev))
return 0;
input = input_allocate_device(); input = input_allocate_device();
if (input == NULL) if (input == NULL)
return -ENOMEM; return -ENOMEM;