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Subject[PATCH 2/6] media: uvcvideo: Add UVC_CTRL_FLAG_ENTITY_GET_CUR
Date
This flag allows controls to get their current value from an entity
defined function instead of via a query to the USB device.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
drivers/media/usb/uvc/uvc_ctrl.c | 17 +++++++++++++----
include/uapi/linux/uvcvideo.h | 1 +
2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 7acdc055613b..0a8835742d49 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1001,10 +1001,19 @@ static int __uvc_ctrl_get(struct uvc_video_chain *chain,
return -EACCES;

if (!ctrl->loaded) {
- ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, ctrl->entity->id,
- chain->dev->intfnum, ctrl->info.selector,
- uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
- ctrl->info.size);
+ if (ctrl->info.flags & UVC_CTRL_FLAG_ENTITY_GET_CUR) {
+ if (!ctrl->entity->get_cur)
+ return -EINVAL;
+ ret = ctrl->entity->get_cur(ctrl->entity,
+ ctrl->info.selector,
+ uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
+ ctrl->info.size);
+ } else {
+ ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, ctrl->entity->id,
+ chain->dev->intfnum, ctrl->info.selector,
+ uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
+ ctrl->info.size);
+ }
if (ret < 0)
return ret;

diff --git a/include/uapi/linux/uvcvideo.h b/include/uapi/linux/uvcvideo.h
index 69b636290c31..cb91797d2a09 100644
--- a/include/uapi/linux/uvcvideo.h
+++ b/include/uapi/linux/uvcvideo.h
@@ -32,6 +32,7 @@
#define UVC_CTRL_FLAG_ASYNCHRONOUS (1 << 8)
/* Entity queries */
#define UVC_CTRL_FLAG_ENTITY_GET_INFO (1 << 9)
+#define UVC_CTRL_FLAG_ENTITY_GET_CUR (1 << 10)

#define UVC_CTRL_FLAG_GET_RANGE \
(UVC_CTRL_FLAG_GET_CUR | UVC_CTRL_FLAG_GET_MIN | \
--
2.29.0.rc1.297.gfa9743e501-goog
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