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media: v4l: ctrls: Add debug messages

Browse source 
Currently, the v4l2 control code is a bit silent on errors.
Add debug messages on (hopefully) most of the error paths.

Signed-off-by: Ezequiel Garcia <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Ezequiel Garcia 2019-07-20 07:47:07 -04:00 • committed by Mauro Carvalho Chehab
commit 173f6eacc8
7 changed files with 127 additions and 39 deletions
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9
include/media/v4l2-ctrls.h
View file

@ -1268,25 +1268,28 @@ int v4l2_s_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
* :ref:`VIDIOC_G_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl
*
* @hdl: pointer to &struct v4l2_ctrl_handler
* @vdev: pointer to &struct video_device
* @mdev: pointer to &struct media_device
* @c: pointer to &struct v4l2_ext_controls
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct media_device *mdev,
struct v4l2_ext_controls *c);
int v4l2_g_ext_ctrls(struct v4l2_ctrl_handler *hdl, struct video_device *vdev,
struct media_device *mdev, struct v4l2_ext_controls *c);
/**
* v4l2_try_ext_ctrls - Helper function to implement
* :ref:`VIDIOC_TRY_EXT_CTRLS <vidioc_g_ext_ctrls>` ioctl
*
* @hdl: pointer to &struct v4l2_ctrl_handler
* @vdev: pointer to &struct video_device
* @mdev: pointer to &struct media_device
* @c: pointer to &struct v4l2_ext_controls
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl,
struct video_device *vdev,
struct media_device *mdev,
struct v4l2_ext_controls *c);
@ -1296,12 +1299,14 @@ int v4l2_try_ext_ctrls(struct v4l2_ctrl_handler *hdl,
*
* @fh: pointer to &struct v4l2_fh
* @hdl: pointer to &struct v4l2_ctrl_handler
* @vdev: pointer to &struct video_device
* @mdev: pointer to &struct media_device
* @c: pointer to &struct v4l2_ext_controls
*
* If hdl == NULL then they will all return -EINVAL.
*/
int v4l2_s_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl,
struct video_device *vdev,
struct media_device *mdev,
struct v4l2_ext_controls *c);

2
include/media/v4l2-ioctl.h
View file

@ -602,6 +602,8 @@ struct v4l2_ioctl_ops {
#define V4L2_DEV_DEBUG_STREAMING 0x08
/* Log poll() */
#define V4L2_DEV_DEBUG_POLL 0x10
/* Log controls */
#define V4L2_DEV_DEBUG_CTRL 0x20
/* Video standard functions */