[PATCH v5 00/13] uvcvideo: Fix v4l2-compliance errors

[PATCH v5 00/13] uvcvideo: Fix v4l2-compliance errors

[Ricardo Ribalda]

v4l2-compliance -m /dev/media0 -a -f
Total for uvcvideo device /dev/media0: 8, Succeeded: 6, Failed: 2, Warnings: 0
Total for uvcvideo device /dev/video0: 54, Succeeded: 50, Failed: 4, Warnings: 2
Total for uvcvideo device /dev/video1: 46, Succeeded: 46, Failed: 0, Warnings: 0
Grand Total for uvcvideo device /dev/media0: 108, Succeeded: 102,
Failed: 6, Warnings: 2

After fixing all of them we go down to:

Total for uvcvideo device /dev/media0: 8, Succeeded: 8, Failed: 0, Warnings: 0
Total for uvcvideo device /dev/video0: 54, Succeeded: 54, Failed: 0, Warnings: 0
Total for uvcvideo device /dev/video1: 46, Succeeded: 46, Failed: 0, Warnings: 0
Grand Total for uvcvideo device /dev/media0: 108, Succeeded: 108,
Failed: 0, Warnings: 0

YES, NO MORE WARNINGS :)

Note that we depend on:
https://patchwork.linuxtv.org/project/linux-media/patch/20210315172531.101694-1-ribalda@chromium.org/

With Hans patch we can also pass v4l2-compliance -s.

Changelog  from v4 (Thanks to Hans and Laurent)
- Use framework names for controls
- Check the control flags before accessing them
- Drop meta headers instead of returning error
- Fix error_idx handling in v4l2-ioctl

Hans Verkuil (1):
  uvc: use vb2 ioctl and fop helpers

Ricardo Ribalda (12):
  media: v4l2-ioctl: Fix check_ext_ctrls
  media: uvcvideo: Set capability in s_param
  media: uvcvideo: Return -EIO for control errors
  media: uvcvideo: Check controls flags before accessing them
  media: uvcvideo: refactor __uvc_ctrl_add_mapping
  media: uvcvideo: Add support for V4L2_CTRL_TYPE_CTRL_CLASS
  media: uvcvideo: Use dev->name for querycap()
  media: uvcvideo: Set unique vdev name based in type
  media: uvcvideo: Increase the size of UVC_METADATA_BUF_SIZE
  media: uvcvideo: Return -EACCES to inactive controls
  media: uvcvideo: Use control names from framework
  media: v4l2-ioctl: Set error_idx to the right value

 drivers/media/usb/uvc/uvc_ctrl.c     | 209 +++++++++++----
 drivers/media/usb/uvc/uvc_driver.c   |  22 +-
 drivers/media/usb/uvc/uvc_metadata.c |   8 +-
 drivers/media/usb/uvc/uvc_queue.c    | 143 ----------
 drivers/media/usb/uvc/uvc_v4l2.c     | 373 ++++++---------------------
 drivers/media/usb/uvc/uvc_video.c    |  13 +-
 drivers/media/usb/uvc/uvcvideo.h     |  41 +--
 drivers/media/v4l2-core/v4l2-ioctl.c |  40 ++-
 8 files changed, 303 insertions(+), 546 deletions(-)

-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v5 01/13] media: v4l2-ioctl: Fix check_ext_ctrls

[Ricardo Ribalda]

Drivers that do not use the ctrl-framework use this function instead.

- Return error when handling of REQUEST_VAL.
- Do not check for multiple classes when getting the DEF_VAL.

Fixes v4l2-compliance:
Control ioctls (Input 0):
		fail: v4l2-test-controls.cpp(813): doioctl(node, VIDIOC_G_EXT_CTRLS, &ctrls)
	test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL

Cc: stable@vger.kernel.org
Fixes: 6fa6f831f095 ("media: v4l2-ctrls: add core request support")
Suggested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 31d1342e61e8..9406e90ff805 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -917,15 +917,24 @@ static int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
 	for (i = 0; i < c->count; i++)
 		c->controls[i].reserved2[0] = 0;
 
-	/* V4L2_CID_PRIVATE_BASE cannot be used as control class
-	   when using extended controls.
-	   Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
-	   is it allowed for backwards compatibility.
-	 */
-	if (!allow_priv && c->which == V4L2_CID_PRIVATE_BASE)
-		return 0;
-	if (!c->which)
+	switch (c->which) {
+	case V4L2_CID_PRIVATE_BASE:
+		/*
+		 * V4L2_CID_PRIVATE_BASE cannot be used as control class
+		 * when using extended controls.
+		 * Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
+		 * is it allowed for backwards compatibility.
+		*/
+		if (!allow_priv)
+			return 0;
+		break;
+	case V4L2_CTRL_WHICH_DEF_VAL:
+	case V4L2_CTRL_WHICH_CUR_VAL:
 		return 1;
+	case V4L2_CTRL_WHICH_REQUEST_VAL:
+		return 0;
+	}
+
 	/* Check that all controls are from the same control class. */
 	for (i = 0; i < c->count; i++) {
 		if (V4L2_CTRL_ID2WHICH(c->controls[i].id) != c->which) {
-- 
2.31.0.rc2.261.g7f71774620-goog

Re: [PATCH v5 01/13] media: v4l2-ioctl: Fix check_ext_ctrls

[Hans Verkuil]

On 16/03/2021 18:59, Ricardo Ribalda wrote:
> Drivers that do not use the ctrl-framework use this function instead.
> 
> - Return error when handling of REQUEST_VAL.
> - Do not check for multiple classes when getting the DEF_VAL.
> 
> Fixes v4l2-compliance:
> Control ioctls (Input 0):
> 		fail: v4l2-test-controls.cpp(813): doioctl(node, VIDIOC_G_EXT_CTRLS, &ctrls)
> 	test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL
> 
> Cc: stable@vger.kernel.org
> Fixes: 6fa6f831f095 ("media: v4l2-ctrls: add core request support")
> Suggested-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
>  drivers/media/v4l2-core/v4l2-ioctl.c | 25 +++++++++++++++++--------
>  1 file changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 31d1342e61e8..9406e90ff805 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -917,15 +917,24 @@ static int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)

allow_priv really should be a bool.

>  	for (i = 0; i < c->count; i++)
>  		c->controls[i].reserved2[0] = 0;
>  
> -	/* V4L2_CID_PRIVATE_BASE cannot be used as control class
> -	   when using extended controls.
> -	   Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
> -	   is it allowed for backwards compatibility.
> -	 */
> -	if (!allow_priv && c->which == V4L2_CID_PRIVATE_BASE)
> -		return 0;
> -	if (!c->which)
> +	switch (c->which) {
> +	case V4L2_CID_PRIVATE_BASE:
> +		/*
> +		 * V4L2_CID_PRIVATE_BASE cannot be used as control class
> +		 * when using extended controls.
> +		 * Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
> +		 * is it allowed for backwards compatibility.
> +		*/
> +		if (!allow_priv)
> +			return 0;
> +		break;
> +	case V4L2_CTRL_WHICH_DEF_VAL:

I think it would be better if a second bool 'is_get' argument is added that is true
for g_ctrl and g_ext_ctrls: then you can do a 'return is_get;' here. That way drivers
do not need to take care of V4L2_CTRL_WHICH_DEF_VAL for set/try.

Regards,

	Hans

> +	case V4L2_CTRL_WHICH_CUR_VAL:
>  		return 1;
> +	case V4L2_CTRL_WHICH_REQUEST_VAL:
> +		return 0;
> +	}
> +
>  	/* Check that all controls are from the same control class. */
>  	for (i = 0; i < c->count; i++) {
>  		if (V4L2_CTRL_ID2WHICH(c->controls[i].id) != c->which) {
> 

[PATCH v5 02/13] media: uvcvideo: Set capability in s_param

[Ricardo Ribalda]

Fixes v4l2-compliance:

Format ioctls (Input 0):
                warn: v4l2-test-formats.cpp(1339): S_PARM is supported but doesn't report V4L2_CAP_TIMEPERFRAME
                fail: v4l2-test-formats.cpp(1241): node->has_frmintervals && !cap->capability

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_v4l2.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 252136cc885c..157310c0ca87 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -472,10 +472,13 @@ static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 	uvc_simplify_fraction(&timeperframe.numerator,
 		&timeperframe.denominator, 8, 333);
 
-	if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+	if (parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 		parm->parm.capture.timeperframe = timeperframe;
-	else
+		parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
+	} else {
 		parm->parm.output.timeperframe = timeperframe;
+		parm->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
+	}
 
 	return 0;
 }
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v5 03/13] media: uvcvideo: Return -EIO for control errors

[Ricardo Ribalda]

The device is doing something unspected with the control. Either because
the protocol is not properly implemented or there has been a HW error.

Fixes v4l2-compliance:

Control ioctls (Input 0):
                fail: v4l2-test-controls.cpp(448): s_ctrl returned an error (22)
        test VIDIOC_G/S_CTRL: FAIL
                fail: v4l2-test-controls.cpp(698): s_ext_ctrls returned an error (22)
        test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_video.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index f2f565281e63..25fd8aa23529 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -112,6 +112,11 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit,
 	case 5: /* Invalid unit */
 	case 6: /* Invalid control */
 	case 7: /* Invalid Request */
+		/*
+		 * The firmware has not properly implemented
+		 * the control or there has been a HW error.
+		 */
+		return -EIO;
 	case 8: /* Invalid value within range */
 		return -EINVAL;
 	default: /* reserved or unknown */
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v5 04/13] media: uvcvideo: Check controls flags before accessing them

[Ricardo Ribalda]

We can figure out if reading/writing a set of controls can fail without
accessing them by checking their flags.

This way we can honor the API closer:

If an error is found when validating the list of controls passed with
VIDIOC_G_EXT_CTRLS, then error_idx shall be set to ctrls->count to
indicate to userspace that no actual hardware was touched.

Fixes v4l2-compliance:
Control ioctls (Input 0):
		warn: v4l2-test-controls.cpp(765): g_ext_ctrls(0) invalid error_idx 0
                fail: v4l2-test-controls.cpp(645): invalid error index write only control
        test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_v4l2.c | 69 +++++++++++++++++++++++---------
 1 file changed, 51 insertions(+), 18 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 157310c0ca87..e956d833ed84 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1040,31 +1040,54 @@ static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
 	return 0;
 }
 
-static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
-				 struct v4l2_ext_controls *ctrls)
+static int uvc_ctrl_check_access(struct uvc_video_chain *chain,
+				 struct v4l2_ext_controls *ctrls, bool read)
 {
-	struct uvc_fh *handle = fh;
-	struct uvc_video_chain *chain = handle->chain;
 	struct v4l2_ext_control *ctrl = ctrls->controls;
 	unsigned int i;
-	int ret;
+	int ret = 0;
 
-	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
-		for (i = 0; i < ctrls->count; ++ctrl, ++i) {
-			struct v4l2_queryctrl qc = { .id = ctrl->id };
+	for (i = 0; i < ctrls->count; ++ctrl, ++i) {
+		struct v4l2_queryctrl qc = { .id = ctrl->id };
 
-			ret = uvc_query_v4l2_ctrl(chain, &qc);
-			if (ret < 0) {
-				ctrls->error_idx = i;
-				return ret;
-			}
+		ret = uvc_query_v4l2_ctrl(chain, &qc);
+		if (ret < 0)
+			break;
 
+		if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
 			ctrl->value = qc.default_value;
+			continue;
 		}
 
-		return 0;
+		if (qc.flags & V4L2_CTRL_FLAG_WRITE_ONLY && read) {
+			ret = -EACCES;
+			break;
+		}
+
+		if (qc.flags & V4L2_CTRL_FLAG_READ_ONLY && !read) {
+			ret = -EACCES;
+			break;
+		}
 	}
 
+	ctrls->error_idx = ctrls->count;
+
+	return ret;
+}
+
+static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
+				 struct v4l2_ext_controls *ctrls)
+{
+	struct uvc_fh *handle = fh;
+	struct uvc_video_chain *chain = handle->chain;
+	struct v4l2_ext_control *ctrl = ctrls->controls;
+	unsigned int i;
+	int ret;
+
+	ret = uvc_ctrl_check_access(chain, ctrls, true);
+	if (ret < 0 || ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
+		return ret;
+
 	ret = uvc_ctrl_begin(chain);
 	if (ret < 0)
 		return ret;
@@ -1092,10 +1115,6 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
 	unsigned int i;
 	int ret;
 
-	/* Default value cannot be changed */
-	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
-		return -EINVAL;
-
 	ret = uvc_ctrl_begin(chain);
 	if (ret < 0)
 		return ret;
@@ -1121,6 +1140,16 @@ static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
 				 struct v4l2_ext_controls *ctrls)
 {
 	struct uvc_fh *handle = fh;
+	struct uvc_video_chain *chain = handle->chain;
+	int ret;
+
+	/* Default value cannot be changed */
+	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
+		return -EINVAL;
+
+	ret = uvc_ctrl_check_access(chain, ctrls, false);
+	if (ret < 0)
+		return ret;
 
 	return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
 }
@@ -1130,6 +1159,10 @@ static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
 {
 	struct uvc_fh *handle = fh;
 
+	/* Default value cannot be changed */
+	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
+		return -EINVAL;
+
 	return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
 }
 
-- 
2.31.0.rc2.261.g7f71774620-goog

Re: [PATCH v5 04/13] media: uvcvideo: Check controls flags before accessing them

[Hans Verkuil]

On 16/03/2021 18:59, Ricardo Ribalda wrote:
> We can figure out if reading/writing a set of controls can fail without
> accessing them by checking their flags.
> 
> This way we can honor the API closer:
> 
> If an error is found when validating the list of controls passed with
> VIDIOC_G_EXT_CTRLS, then error_idx shall be set to ctrls->count to
> indicate to userspace that no actual hardware was touched.
> 
> Fixes v4l2-compliance:
> Control ioctls (Input 0):
> 		warn: v4l2-test-controls.cpp(765): g_ext_ctrls(0) invalid error_idx 0
>                 fail: v4l2-test-controls.cpp(645): invalid error index write only control
>         test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL
> 
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
>  drivers/media/usb/uvc/uvc_v4l2.c | 69 +++++++++++++++++++++++---------
>  1 file changed, 51 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index 157310c0ca87..e956d833ed84 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -1040,31 +1040,54 @@ static int uvc_ioctl_s_ctrl(struct file *file, void *fh,
>  	return 0;
>  }
>  
> -static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
> -				 struct v4l2_ext_controls *ctrls)
> +static int uvc_ctrl_check_access(struct uvc_video_chain *chain,
> +				 struct v4l2_ext_controls *ctrls, bool read)
>  {
> -	struct uvc_fh *handle = fh;
> -	struct uvc_video_chain *chain = handle->chain;
>  	struct v4l2_ext_control *ctrl = ctrls->controls;
>  	unsigned int i;
> -	int ret;
> +	int ret = 0;
>  
> -	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
> -		for (i = 0; i < ctrls->count; ++ctrl, ++i) {
> -			struct v4l2_queryctrl qc = { .id = ctrl->id };
> +	for (i = 0; i < ctrls->count; ++ctrl, ++i) {
> +		struct v4l2_queryctrl qc = { .id = ctrl->id };
>  
> -			ret = uvc_query_v4l2_ctrl(chain, &qc);
> -			if (ret < 0) {
> -				ctrls->error_idx = i;
> -				return ret;
> -			}
> +		ret = uvc_query_v4l2_ctrl(chain, &qc);

You can't call this. If I am not mistaken, this call can actually call
the hardware.

Instead you need to call the lower level function uvc_find_control() and
use ctrl->info to check for read/write only.

> +		if (ret < 0)
> +			break;
>  
> +		if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
>  			ctrl->value = qc.default_value;

This needs to use the old code in uvc_ioctl_g_ext_ctrls() since it depends
on uvc_query_v4l2_ctrl() which accesses the hardware.

> +			continue;
>  		}
>  
> -		return 0;
> +		if (qc.flags & V4L2_CTRL_FLAG_WRITE_ONLY && read) {
> +			ret = -EACCES;
> +			break;
> +		}
> +
> +		if (qc.flags & V4L2_CTRL_FLAG_READ_ONLY && !read) {
> +			ret = -EACCES;
> +			break;
> +		}
>  	}
>  
> +	ctrls->error_idx = ctrls->count;
> +
> +	return ret;
> +}

So uvc_ctrl_check_access() is a good idea, but it does a bit too much.
It should just check if all controls in the list are known and check for
write/read only.

Regards,

	Hans

> +
> +static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
> +				 struct v4l2_ext_controls *ctrls)
> +{
> +	struct uvc_fh *handle = fh;
> +	struct uvc_video_chain *chain = handle->chain;
> +	struct v4l2_ext_control *ctrl = ctrls->controls;
> +	unsigned int i;
> +	int ret;
> +
> +	ret = uvc_ctrl_check_access(chain, ctrls, true);
> +	if (ret < 0 || ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
> +		return ret;
> +
>  	ret = uvc_ctrl_begin(chain);
>  	if (ret < 0)
>  		return ret;
> @@ -1092,10 +1115,6 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
>  	unsigned int i;
>  	int ret;
>  
> -	/* Default value cannot be changed */
> -	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
> -		return -EINVAL;
> -
>  	ret = uvc_ctrl_begin(chain);
>  	if (ret < 0)
>  		return ret;
> @@ -1121,6 +1140,16 @@ static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
>  				 struct v4l2_ext_controls *ctrls)
>  {
>  	struct uvc_fh *handle = fh;
> +	struct uvc_video_chain *chain = handle->chain;
> +	int ret;
> +
> +	/* Default value cannot be changed */
> +	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
> +		return -EINVAL;
> +
> +	ret = uvc_ctrl_check_access(chain, ctrls, false);
> +	if (ret < 0)
> +		return ret;
>  
>  	return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, true);
>  }
> @@ -1130,6 +1159,10 @@ static int uvc_ioctl_try_ext_ctrls(struct file *file, void *fh,
>  {
>  	struct uvc_fh *handle = fh;
>  
> +	/* Default value cannot be changed */
> +	if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
> +		return -EINVAL;
> +
>  	return uvc_ioctl_s_try_ext_ctrls(handle, ctrls, false);
>  }
>  
> 

[PATCH v5 05/13] media: uvcvideo: refactor __uvc_ctrl_add_mapping

[Ricardo Ribalda]

Pass the chain instead of the device. We want to keed the reference to
the chain that controls belong to.

We need to delay the initialization of the controls after the chains
have been initialized.

This is a cleanup needed for the next patches.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c   | 41 ++++++++++++++++++++----------
 drivers/media/usb/uvc/uvc_driver.c |  8 +++---
 2 files changed, 32 insertions(+), 17 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index b3dde98499f4..b75da65115ef 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -2057,7 +2057,7 @@ static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl,
 /*
  * Add a control mapping to a given control.
  */
-static int __uvc_ctrl_add_mapping(struct uvc_device *dev,
+static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 	struct uvc_control *ctrl, const struct uvc_control_mapping *mapping)
 {
 	struct uvc_control_mapping *map;
@@ -2086,7 +2086,7 @@ static int __uvc_ctrl_add_mapping(struct uvc_device *dev,
 		map->set = uvc_set_le_value;
 
 	list_add_tail(&map->list, &ctrl->info.mappings);
-	uvc_dbg(dev, CONTROL, "Adding mapping '%s' to control %pUl/%u\n",
+	uvc_dbg(chain->dev, CONTROL, "Adding mapping '%s' to control %pUl/%u\n",
 		map->name, ctrl->info.entity, ctrl->info.selector);
 
 	return 0;
@@ -2168,7 +2168,7 @@ int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 		goto done;
 	}
 
-	ret = __uvc_ctrl_add_mapping(dev, ctrl, mapping);
+	ret = __uvc_ctrl_add_mapping(chain, ctrl, mapping);
 	if (ret < 0)
 		atomic_dec(&dev->nmappings);
 
@@ -2244,7 +2244,8 @@ static void uvc_ctrl_prune_entity(struct uvc_device *dev,
  * Add control information and hardcoded stock control mappings to the given
  * device.
  */
-static void uvc_ctrl_init_ctrl(struct uvc_device *dev, struct uvc_control *ctrl)
+static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain,
+			       struct uvc_control *ctrl)
 {
 	const struct uvc_control_info *info = uvc_ctrls;
 	const struct uvc_control_info *iend = info + ARRAY_SIZE(uvc_ctrls);
@@ -2263,14 +2264,14 @@ static void uvc_ctrl_init_ctrl(struct uvc_device *dev, struct uvc_control *ctrl)
 	for (; info < iend; ++info) {
 		if (uvc_entity_match_guid(ctrl->entity, info->entity) &&
 		    ctrl->index == info->index) {
-			uvc_ctrl_add_info(dev, ctrl, info);
+			uvc_ctrl_add_info(chain->dev, ctrl, info);
 			/*
 			 * Retrieve control flags from the device. Ignore errors
 			 * and work with default flag values from the uvc_ctrl
 			 * array when the device doesn't properly implement
 			 * GET_INFO on standard controls.
 			 */
-			uvc_ctrl_get_flags(dev, ctrl, &ctrl->info);
+			uvc_ctrl_get_flags(chain->dev, ctrl, &ctrl->info);
 			break;
 		 }
 	}
@@ -2281,22 +2282,20 @@ static void uvc_ctrl_init_ctrl(struct uvc_device *dev, struct uvc_control *ctrl)
 	for (; mapping < mend; ++mapping) {
 		if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
 		    ctrl->info.selector == mapping->selector)
-			__uvc_ctrl_add_mapping(dev, ctrl, mapping);
+			__uvc_ctrl_add_mapping(chain, ctrl, mapping);
 	}
 }
 
 /*
  * Initialize device controls.
  */
-int uvc_ctrl_init_device(struct uvc_device *dev)
+static int uvc_ctrl_init_chain(struct uvc_video_chain *chain)
 {
 	struct uvc_entity *entity;
 	unsigned int i;
 
-	INIT_WORK(&dev->async_ctrl.work, uvc_ctrl_status_event_work);
-
 	/* Walk the entities list and instantiate controls */
-	list_for_each_entry(entity, &dev->entities, list) {
+	list_for_each_entry(entity, &chain->entities, chain) {
 		struct uvc_control *ctrl;
 		unsigned int bControlSize = 0, ncontrols;
 		u8 *bmControls = NULL;
@@ -2316,7 +2315,7 @@ int uvc_ctrl_init_device(struct uvc_device *dev)
 		}
 
 		/* Remove bogus/blacklisted controls */
-		uvc_ctrl_prune_entity(dev, entity);
+		uvc_ctrl_prune_entity(chain->dev, entity);
 
 		/* Count supported controls and allocate the controls array */
 		ncontrols = memweight(bmControls, bControlSize);
@@ -2338,7 +2337,7 @@ int uvc_ctrl_init_device(struct uvc_device *dev)
 			ctrl->entity = entity;
 			ctrl->index = i;
 
-			uvc_ctrl_init_ctrl(dev, ctrl);
+			uvc_ctrl_init_ctrl(chain, ctrl);
 			ctrl++;
 		}
 	}
@@ -2346,6 +2345,22 @@ int uvc_ctrl_init_device(struct uvc_device *dev)
 	return 0;
 }
 
+int uvc_ctrl_init_device(struct uvc_device *dev)
+{
+	struct uvc_video_chain *chain;
+	int ret;
+
+	INIT_WORK(&dev->async_ctrl.work, uvc_ctrl_status_event_work);
+
+	list_for_each_entry(chain, &dev->chains, list) {
+		ret = uvc_ctrl_init_chain(chain);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 /*
  * Cleanup device controls.
  */
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 30ef2a3110f7..35873cf2773d 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2423,14 +2423,14 @@ static int uvc_probe(struct usb_interface *intf,
 	if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
 		goto error;
 
-	/* Initialize controls. */
-	if (uvc_ctrl_init_device(dev) < 0)
-		goto error;
-
 	/* Scan the device for video chains. */
 	if (uvc_scan_device(dev) < 0)
 		goto error;
 
+	/* Initialize controls. */
+	if (uvc_ctrl_init_device(dev) < 0)
+		goto error;
+
 	/* Register video device nodes. */
 	if (uvc_register_chains(dev) < 0)
 		goto error;
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v5 06/13] media: uvcvideo: Add support for V4L2_CTRL_TYPE_CTRL_CLASS

[Ricardo Ribalda]

Create all the class controls for the device defined controls.

Fixes v4l2-compliance:
Control ioctls (Input 0):
		fail: v4l2-test-controls.cpp(216): missing control class for class 00980000
		fail: v4l2-test-controls.cpp(216): missing control tclass for class 009a0000
	test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: FAIL

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 94 ++++++++++++++++++++++++++++++++
 drivers/media/usb/uvc/uvcvideo.h |  5 ++
 2 files changed, 99 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index b75da65115ef..ba14733db757 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -357,6 +357,15 @@ static const struct uvc_control_info uvc_ctrls[] = {
 	},
 };
 
+static const struct uvc_control_class uvc_control_class[] = {
+	{
+		.id		= V4L2_CID_CAMERA_CLASS,
+	},
+	{
+		.id		= V4L2_CID_USER_CLASS,
+	},
+};
+
 static const struct uvc_menu_info power_line_frequency_controls[] = {
 	{ 0, "Disabled" },
 	{ 1, "50 Hz" },
@@ -1024,6 +1033,49 @@ static int __uvc_ctrl_get(struct uvc_video_chain *chain,
 	return 0;
 }
 
+static int __uvc_query_v4l2_class(struct uvc_video_chain *chain, u32 req_id,
+				  u32 found_id)
+{
+	bool find_next = req_id & V4L2_CTRL_FLAG_NEXT_CTRL;
+	unsigned int i;
+
+	req_id &= V4L2_CTRL_ID_MASK;
+
+	for (i = 0; i < ARRAY_SIZE(uvc_control_class); i++) {
+		if (!(chain->ctrl_class_bitmap & BIT(i)))
+			continue;
+		if (!find_next) {
+			if (uvc_control_class[i].id == req_id)
+				return i;
+			continue;
+		}
+		if (uvc_control_class[i].id > req_id &&
+		    uvc_control_class[i].id < found_id)
+			return i;
+	}
+
+	return -ENODEV;
+}
+
+static int uvc_query_v4l2_class(struct uvc_video_chain *chain, u32 req_id,
+				u32 found_id, struct v4l2_queryctrl *v4l2_ctrl)
+{
+	int idx;
+
+	idx = __uvc_query_v4l2_class(chain, req_id, found_id);
+	if (idx < 0)
+		return -ENODEV;
+
+	memset(v4l2_ctrl, 0, sizeof(*v4l2_ctrl));
+	v4l2_ctrl->id = uvc_control_class[idx].id;
+	strscpy(v4l2_ctrl->name, v4l2_ctrl_get_name(v4l2_ctrl->id),
+		sizeof(v4l2_ctrl->name));
+	v4l2_ctrl->type = V4L2_CTRL_TYPE_CTRL_CLASS;
+	v4l2_ctrl->flags = V4L2_CTRL_FLAG_WRITE_ONLY
+			   | V4L2_CTRL_FLAG_READ_ONLY;
+	return 0;
+}
+
 static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 	struct uvc_control *ctrl,
 	struct uvc_control_mapping *mapping,
@@ -1127,12 +1179,31 @@ int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 	if (ret < 0)
 		return -ERESTARTSYS;
 
+	/* Check if the ctrl is a know class */
+	if (!(v4l2_ctrl->id & V4L2_CTRL_FLAG_NEXT_CTRL)) {
+		ret = uvc_query_v4l2_class(chain, v4l2_ctrl->id, 0, v4l2_ctrl);
+		if (!ret)
+			goto done;
+	}
+
 	ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping);
 	if (ctrl == NULL) {
 		ret = -EINVAL;
 		goto done;
 	}
 
+	/*
+	 * If we're enumerating control with V4L2_CTRL_FLAG_NEXT_CTRL, check if
+	 * a class should be inserted between the previous control and the one
+	 * we have just found.
+	 */
+	if (v4l2_ctrl->id & V4L2_CTRL_FLAG_NEXT_CTRL) {
+		ret = uvc_query_v4l2_class(chain, v4l2_ctrl->id, mapping->id,
+					   v4l2_ctrl);
+		if (!ret)
+			goto done;
+	}
+
 	ret = __uvc_query_v4l2_ctrl(chain, ctrl, mapping, v4l2_ctrl);
 done:
 	mutex_unlock(&chain->ctrl_mutex);
@@ -1426,6 +1497,11 @@ static int uvc_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
 	if (ret < 0)
 		return -ERESTARTSYS;
 
+	if (__uvc_query_v4l2_class(handle->chain, sev->id, 0) >= 0) {
+		ret = 0;
+		goto done;
+	}
+
 	ctrl = uvc_find_control(handle->chain, sev->id, &mapping);
 	if (ctrl == NULL) {
 		ret = -EINVAL;
@@ -1459,7 +1535,10 @@ static void uvc_ctrl_del_event(struct v4l2_subscribed_event *sev)
 	struct uvc_fh *handle = container_of(sev->fh, struct uvc_fh, vfh);
 
 	mutex_lock(&handle->chain->ctrl_mutex);
+	if (__uvc_query_v4l2_class(handle->chain, sev->id, 0) >= 0)
+		goto done;
 	list_del(&sev->node);
+done:
 	mutex_unlock(&handle->chain->ctrl_mutex);
 }
 
@@ -1577,6 +1656,9 @@ int uvc_ctrl_get(struct uvc_video_chain *chain,
 	struct uvc_control *ctrl;
 	struct uvc_control_mapping *mapping;
 
+	if (__uvc_query_v4l2_class(chain, xctrl->id, 0) >= 0)
+		return -EACCES;
+
 	ctrl = uvc_find_control(chain, xctrl->id, &mapping);
 	if (ctrl == NULL)
 		return -EINVAL;
@@ -1596,6 +1678,9 @@ int uvc_ctrl_set(struct uvc_fh *handle,
 	s32 max;
 	int ret;
 
+	if (__uvc_query_v4l2_class(chain, xctrl->id, 0) >= 0)
+		return -EACCES;
+
 	ctrl = uvc_find_control(chain, xctrl->id, &mapping);
 	if (ctrl == NULL)
 		return -EINVAL;
@@ -2062,6 +2147,7 @@ static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 {
 	struct uvc_control_mapping *map;
 	unsigned int size;
+	unsigned int i;
 
 	/* Most mappings come from static kernel data and need to be duplicated.
 	 * Mappings that come from userspace will be unnecessarily duplicated,
@@ -2085,6 +2171,14 @@ static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 	if (map->set == NULL)
 		map->set = uvc_set_le_value;
 
+	for (i = 0; i < ARRAY_SIZE(uvc_control_class); i++) {
+		if (V4L2_CTRL_ID2WHICH(uvc_control_class[i].id) ==
+						V4L2_CTRL_ID2WHICH(map->id)) {
+			chain->ctrl_class_bitmap |= BIT(i);
+			break;
+		}
+	}
+
 	list_add_tail(&map->list, &ctrl->info.mappings);
 	uvc_dbg(chain->dev, CONTROL, "Adding mapping '%s' to control %pUl/%u\n",
 		map->name, ctrl->info.entity, ctrl->info.selector);
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 97df5ecd66c9..b81d3f65e52e 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -262,6 +262,10 @@ struct uvc_control_mapping {
 		    u8 *data);
 };
 
+struct uvc_control_class {
+	u32 id;
+};
+
 struct uvc_control {
 	struct uvc_entity *entity;
 	struct uvc_control_info info;
@@ -475,6 +479,7 @@ struct uvc_video_chain {
 
 	struct v4l2_prio_state prio;		/* V4L2 priority state */
 	u32 caps;				/* V4L2 chain-wide caps */
+	u8 ctrl_class_bitmap;			/* Bitmap of valid classes */
 };
 
 struct uvc_stats_frame {
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v5 07/13] media: uvcvideo: Use dev->name for querycap()

[Ricardo Ribalda]

Use the device name for the card name instead of cap->card.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_v4l2.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index e956d833ed84..d780065f3716 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -617,13 +617,12 @@ static int uvc_v4l2_release(struct file *file)
 static int uvc_ioctl_querycap(struct file *file, void *fh,
 			      struct v4l2_capability *cap)
 {
-	struct video_device *vdev = video_devdata(file);
 	struct uvc_fh *handle = file->private_data;
 	struct uvc_video_chain *chain = handle->chain;
 	struct uvc_streaming *stream = handle->stream;
 
 	strscpy(cap->driver, "uvcvideo", sizeof(cap->driver));
-	strscpy(cap->card, vdev->name, sizeof(cap->card));
+	strscpy(cap->card, handle->stream->dev->name, sizeof(cap->card));
 	usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
 	cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 			  | chain->caps;
-- 
2.31.0.rc2.261.g7f71774620-goog

Re: [PATCH v5 07/13] media: uvcvideo: Use dev->name for querycap()

[Hans Verkuil]

On 16/03/2021 18:59, Ricardo Ribalda wrote:
> Use the device name for the card name instead of cap->card.

You mean: 'instead of vdev->name.' ?

> 
> Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
>  drivers/media/usb/uvc/uvc_v4l2.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index e956d833ed84..d780065f3716 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -617,13 +617,12 @@ static int uvc_v4l2_release(struct file *file)
>  static int uvc_ioctl_querycap(struct file *file, void *fh,
>  			      struct v4l2_capability *cap)
>  {
> -	struct video_device *vdev = video_devdata(file);
>  	struct uvc_fh *handle = file->private_data;
>  	struct uvc_video_chain *chain = handle->chain;
>  	struct uvc_streaming *stream = handle->stream;
>  
>  	strscpy(cap->driver, "uvcvideo", sizeof(cap->driver));
> -	strscpy(cap->card, vdev->name, sizeof(cap->card));
> +	strscpy(cap->card, handle->stream->dev->name, sizeof(cap->card));

I don't think this is right. I get this for the video node:

Card type        : Integrated IR Camera: Integrate

and this for the corresponding metadata node:

Card type        : Metadata 7

But they are the same device, so I expect the same text here.

Regards,

	Hans

>  	usb_make_path(stream->dev->udev, cap->bus_info, sizeof(cap->bus_info));
>  	cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
>  			  | chain->caps;
> 

[PATCH v5 08/13] media: uvcvideo: Set unique vdev name based in type

[Ricardo Ribalda]

All the entities must have a unique name. We can have a descriptive and
unique name by appending the function and the entity->id.

This is even resilent to multi chain devices.

Fixes v4l2-compliance:
Media Controller ioctls:
                fail: v4l2-test-media.cpp(205): v2_entity_names_set.find(key) != v2_entity_names_set.end()
        test MEDIA_IOC_G_TOPOLOGY: FAIL
                fail: v4l2-test-media.cpp(394): num_data_links != num_links
	test MEDIA_IOC_ENUM_ENTITIES/LINKS: FAIL

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/media/usb/uvc/uvc_driver.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 35873cf2773d..76ab6acecbc9 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2163,6 +2163,7 @@ int uvc_register_video_device(struct uvc_device *dev,
 			      const struct v4l2_ioctl_ops *ioctl_ops)
 {
 	int ret;
+	const char *name;
 
 	/* Initialize the video buffers queue. */
 	ret = uvc_queue_init(queue, type, !uvc_no_drop_param);
@@ -2190,16 +2191,20 @@ int uvc_register_video_device(struct uvc_device *dev,
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 	default:
 		vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+		name = "Video Capture";
 		break;
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 		vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
+		name = "Video Output";
 		break;
 	case V4L2_BUF_TYPE_META_CAPTURE:
 		vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
+		name = "Metadata";
 		break;
 	}
 
-	strscpy(vdev->name, dev->name, sizeof(vdev->name));
+	snprintf(vdev->name, sizeof(vdev->name), "%s %u", name,
+		 stream->header.bTerminalLink);
 
 	/*
 	 * Set the driver data before calling video_register_device, otherwise
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v5 09/13] media: uvcvideo: Increase the size of UVC_METADATA_BUF_SIZE

[Ricardo Ribalda]

Hans has discovered that in his test device, for the H264 format
bytesused goes up to about 570, for YUYV it will actually go up
to a bit over 5000 bytes, and for MJPG up to about 2706 bytes.

We should also, according to V4L2_META_FMT_UVC docs, drop headers when
the buffer is full.

Credit-to: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_video.c | 8 +++++---
 drivers/media/usb/uvc/uvcvideo.h  | 2 +-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 25fd8aa23529..ea2903dc3252 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -1244,11 +1244,13 @@ static void uvc_video_decode_meta(struct uvc_streaming *stream,
 	if (!meta_buf || length == 2)
 		return;
 
+	/*
+	 * According to V4L2_META_FMT_UVC docs, we should drop headers when
+	 * the buffer is full.
+	 */
 	if (meta_buf->length - meta_buf->bytesused <
-	    length + sizeof(meta->ns) + sizeof(meta->sof)) {
-		meta_buf->error = 1;
+	    length + sizeof(meta->ns) + sizeof(meta->sof))
 		return;
-	}
 
 	has_pts = mem[1] & UVC_STREAM_PTS;
 	has_scr = mem[1] & UVC_STREAM_SCR;
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index b81d3f65e52e..a26bbec8d37b 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -527,7 +527,7 @@ struct uvc_stats_stream {
 	unsigned int max_sof;		/* Maximum STC.SOF value */
 };
 
-#define UVC_METADATA_BUF_SIZE 1024
+#define UVC_METADATA_BUF_SIZE 10240
 
 /**
  * struct uvc_copy_op: Context structure to schedule asynchronous memcpy
-- 
2.31.0.rc2.261.g7f71774620-goog

Re: [PATCH v5 09/13] media: uvcvideo: Increase the size of UVC_METADATA_BUF_SIZE

[Hans Verkuil]

On 16/03/2021 18:59, Ricardo Ribalda wrote:
> Hans has discovered that in his test device, for the H264 format
> bytesused goes up to about 570, for YUYV it will actually go up
> to a bit over 5000 bytes, and for MJPG up to about 2706 bytes.
> 
> We should also, according to V4L2_META_FMT_UVC docs, drop headers when
> the buffer is full.
> 
> Credit-to: Hans Verkuil <hverkuil@xs4all.nl>
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
>  drivers/media/usb/uvc/uvc_video.c | 8 +++++---
>  drivers/media/usb/uvc/uvcvideo.h  | 2 +-
>  2 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
> index 25fd8aa23529..ea2903dc3252 100644
> --- a/drivers/media/usb/uvc/uvc_video.c
> +++ b/drivers/media/usb/uvc/uvc_video.c
> @@ -1244,11 +1244,13 @@ static void uvc_video_decode_meta(struct uvc_streaming *stream,
>  	if (!meta_buf || length == 2)
>  		return;
>  
> +	/*
> +	 * According to V4L2_META_FMT_UVC docs, we should drop headers when
> +	 * the buffer is full.
> +	 */
>  	if (meta_buf->length - meta_buf->bytesused <
> -	    length + sizeof(meta->ns) + sizeof(meta->sof)) {
> -		meta_buf->error = 1;
> +	    length + sizeof(meta->ns) + sizeof(meta->sof))
>  		return;
> -	}
>  
>  	has_pts = mem[1] & UVC_STREAM_PTS;
>  	has_scr = mem[1] & UVC_STREAM_SCR;
> diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> index b81d3f65e52e..a26bbec8d37b 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -527,7 +527,7 @@ struct uvc_stats_stream {
>  	unsigned int max_sof;		/* Maximum STC.SOF value */
>  };
>  
> -#define UVC_METADATA_BUF_SIZE 1024
> +#define UVC_METADATA_BUF_SIZE 10240
>  
>  /**
>   * struct uvc_copy_op: Context structure to schedule asynchronous memcpy
> 

Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Thanks!

	Hans

[PATCH v5 10/13] media: uvcvideo: Return -EACCES to inactive controls

[Ricardo Ribalda]

If a control is inactive return -EACCES to let the userspace know that
the value will not be applied automatically when the control is active
again.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Suggested-by: Hans Verkuil <hverkuil@xs4all.nl>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index ba14733db757..98614e1be829 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1578,6 +1578,18 @@ int uvc_ctrl_begin(struct uvc_video_chain *chain)
 	return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0;
 }
 
+static bool uvc_ctrl_is_inactive(struct uvc_control *ctrl)
+{
+	struct uvc_control_mapping *map;
+
+	list_for_each_entry(map, &ctrl->info.mappings, list) {
+		if (map->master_id)
+			return true;
+	}
+
+	return false;
+}
+
 static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 	struct uvc_entity *entity, int rollback)
 {
@@ -1621,8 +1633,11 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 
 		ctrl->dirty = 0;
 
-		if (ret < 0)
+		if (ret < 0) {
+			if (uvc_ctrl_is_inactive(ctrl))
+				return -EACCES;
 			return ret;
+		}
 	}
 
 	return 0;
-- 
2.31.0.rc2.261.g7f71774620-goog

Re: [PATCH v5 10/13] media: uvcvideo: Return -EACCES to inactive controls

[Hans Verkuil]

On 16/03/2021 19:00, Ricardo Ribalda wrote:
> If a control is inactive return -EACCES to let the userspace know that
> the value will not be applied automatically when the control is active
> again.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> Suggested-by: Hans Verkuil <hverkuil@xs4all.nl>
> ---
>  drivers/media/usb/uvc/uvc_ctrl.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index ba14733db757..98614e1be829 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -1578,6 +1578,18 @@ int uvc_ctrl_begin(struct uvc_video_chain *chain)
>  	return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0;
>  }
>  
> +static bool uvc_ctrl_is_inactive(struct uvc_control *ctrl)

This doesn't test if the control is inactive, it tests if it *might* be
inactive. To test if it is really inactive would require checking the value
of the master control.

> +{
> +	struct uvc_control_mapping *map;
> +
> +	list_for_each_entry(map, &ctrl->info.mappings, list) {
> +		if (map->master_id)
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
>  static int uvc_ctrl_commit_entity(struct uvc_device *dev,
>  	struct uvc_entity *entity, int rollback)
>  {
> @@ -1621,8 +1633,11 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
>  
>  		ctrl->dirty = 0;
>  
> -		if (ret < 0)
> +		if (ret < 0) {
> +			if (uvc_ctrl_is_inactive(ctrl))
> +				return -EACCES;

So here you assume that if setting the control failed, and if the control
might be inactive, then it probably was inactive.

I feel a bit uncomfortable by this assumption.

Regards,

	Hans

>  			return ret;
> +		}
>  	}
>  
>  	return 0;
> 

[PATCH v5 11/13] media: uvcvideo: Use control names from framework

[Ricardo Ribalda]

The framework already contains a map of IDs to names, lets use it when
possible.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Suggested-by: Hans Verkuil <hverkuil@xs4all.nl>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 57 ++++++++++++--------------------
 drivers/media/usb/uvc/uvc_v4l2.c |  8 ++++-
 drivers/media/usb/uvc/uvcvideo.h |  2 +-
 3 files changed, 30 insertions(+), 37 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 98614e1be829..efbdd49ad8ec 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -436,7 +436,6 @@ static void uvc_ctrl_set_rel_speed(struct uvc_control_mapping *mapping,
 static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	{
 		.id		= V4L2_CID_BRIGHTNESS,
-		.name		= "Brightness",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_BRIGHTNESS_CONTROL,
 		.size		= 16,
@@ -446,7 +445,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_CONTRAST,
-		.name		= "Contrast",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_CONTRAST_CONTROL,
 		.size		= 16,
@@ -456,7 +454,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_HUE,
-		.name		= "Hue",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_HUE_CONTROL,
 		.size		= 16,
@@ -468,7 +465,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_SATURATION,
-		.name		= "Saturation",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_SATURATION_CONTROL,
 		.size		= 16,
@@ -478,7 +474,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_SHARPNESS,
-		.name		= "Sharpness",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_SHARPNESS_CONTROL,
 		.size		= 16,
@@ -488,7 +483,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_GAMMA,
-		.name		= "Gamma",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_GAMMA_CONTROL,
 		.size		= 16,
@@ -498,7 +492,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_BACKLIGHT_COMPENSATION,
-		.name		= "Backlight Compensation",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
 		.size		= 16,
@@ -508,7 +501,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_GAIN,
-		.name		= "Gain",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_GAIN_CONTROL,
 		.size		= 16,
@@ -518,7 +510,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_POWER_LINE_FREQUENCY,
-		.name		= "Power Line Frequency",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
 		.size		= 2,
@@ -530,7 +521,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_HUE_AUTO,
-		.name		= "Hue, Auto",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_HUE_AUTO_CONTROL,
 		.size		= 1,
@@ -541,7 +531,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_EXPOSURE_AUTO,
-		.name		= "Exposure, Auto",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_AE_MODE_CONTROL,
 		.size		= 4,
@@ -554,7 +543,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_EXPOSURE_AUTO_PRIORITY,
-		.name		= "Exposure, Auto Priority",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_AE_PRIORITY_CONTROL,
 		.size		= 1,
@@ -564,7 +552,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_EXPOSURE_ABSOLUTE,
-		.name		= "Exposure (Absolute)",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
 		.size		= 32,
@@ -576,7 +563,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_AUTO_WHITE_BALANCE,
-		.name		= "White Balance Temperature, Auto",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
 		.size		= 1,
@@ -587,7 +573,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_WHITE_BALANCE_TEMPERATURE,
-		.name		= "White Balance Temperature",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
 		.size		= 16,
@@ -599,7 +584,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_AUTO_WHITE_BALANCE,
-		.name		= "White Balance Component, Auto",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
 		.size		= 1,
@@ -611,7 +595,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_BLUE_BALANCE,
-		.name		= "White Balance Blue Component",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
 		.size		= 16,
@@ -623,7 +606,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_RED_BALANCE,
-		.name		= "White Balance Red Component",
 		.entity		= UVC_GUID_UVC_PROCESSING,
 		.selector	= UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
 		.size		= 16,
@@ -635,7 +617,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_FOCUS_ABSOLUTE,
-		.name		= "Focus (absolute)",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_FOCUS_ABSOLUTE_CONTROL,
 		.size		= 16,
@@ -647,7 +628,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_FOCUS_AUTO,
-		.name		= "Focus, Auto",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_FOCUS_AUTO_CONTROL,
 		.size		= 1,
@@ -658,7 +638,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_IRIS_ABSOLUTE,
-		.name		= "Iris, Absolute",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_IRIS_ABSOLUTE_CONTROL,
 		.size		= 16,
@@ -668,7 +647,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_IRIS_RELATIVE,
-		.name		= "Iris, Relative",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_IRIS_RELATIVE_CONTROL,
 		.size		= 8,
@@ -678,7 +656,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_ZOOM_ABSOLUTE,
-		.name		= "Zoom, Absolute",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_ZOOM_ABSOLUTE_CONTROL,
 		.size		= 16,
@@ -688,7 +665,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_ZOOM_CONTINUOUS,
-		.name		= "Zoom, Continuous",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_ZOOM_RELATIVE_CONTROL,
 		.size		= 0,
@@ -700,7 +676,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_PAN_ABSOLUTE,
-		.name		= "Pan (Absolute)",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_PANTILT_ABSOLUTE_CONTROL,
 		.size		= 32,
@@ -710,7 +685,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_TILT_ABSOLUTE,
-		.name		= "Tilt (Absolute)",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_PANTILT_ABSOLUTE_CONTROL,
 		.size		= 32,
@@ -720,7 +694,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_PAN_SPEED,
-		.name		= "Pan (Speed)",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_PANTILT_RELATIVE_CONTROL,
 		.size		= 16,
@@ -732,7 +705,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_TILT_SPEED,
-		.name		= "Tilt (Speed)",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_PANTILT_RELATIVE_CONTROL,
 		.size		= 16,
@@ -744,7 +716,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_PRIVACY,
-		.name		= "Privacy",
 		.entity		= UVC_GUID_UVC_CAMERA,
 		.selector	= UVC_CT_PRIVACY_CONTROL,
 		.size		= 1,
@@ -754,7 +725,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
 	},
 	{
 		.id		= V4L2_CID_PRIVACY,
-		.name		= "Privacy",
 		.entity		= UVC_GUID_EXT_GPIO_CONTROLLER,
 		.selector	= UVC_CT_PRIVACY_CONTROL,
 		.size		= 1,
@@ -1076,6 +1046,20 @@ static int uvc_query_v4l2_class(struct uvc_video_chain *chain, u32 req_id,
 	return 0;
 }
 
+static const char *uvc_map_get_name(const struct uvc_control_mapping *map)
+{
+	const char *name;
+
+	if (map->name)
+		return map->name;
+
+	name = v4l2_ctrl_get_name(map->id);
+	if (name)
+		return name;
+
+	return "Unknown Control";
+}
+
 static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 	struct uvc_control *ctrl,
 	struct uvc_control_mapping *mapping,
@@ -1089,7 +1073,8 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 	memset(v4l2_ctrl, 0, sizeof(*v4l2_ctrl));
 	v4l2_ctrl->id = mapping->id;
 	v4l2_ctrl->type = mapping->v4l2_type;
-	strscpy(v4l2_ctrl->name, mapping->name, sizeof(v4l2_ctrl->name));
+	strscpy(v4l2_ctrl->name, uvc_map_get_name(mapping),
+		sizeof(v4l2_ctrl->name));
 	v4l2_ctrl->flags = 0;
 
 	if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
@@ -2196,7 +2181,8 @@ static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 
 	list_add_tail(&map->list, &ctrl->info.mappings);
 	uvc_dbg(chain->dev, CONTROL, "Adding mapping '%s' to control %pUl/%u\n",
-		map->name, ctrl->info.entity, ctrl->info.selector);
+		uvc_map_get_name(map), ctrl->info.entity,
+		ctrl->info.selector);
 
 	return 0;
 }
@@ -2214,7 +2200,7 @@ int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 	if (mapping->id & ~V4L2_CTRL_ID_MASK) {
 		uvc_dbg(dev, CONTROL,
 			"Can't add mapping '%s', control id 0x%08x is invalid\n",
-			mapping->name, mapping->id);
+			uvc_map_get_name(mapping), mapping->id);
 		return -EINVAL;
 	}
 
@@ -2261,7 +2247,7 @@ int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 		if (mapping->id == map->id) {
 			uvc_dbg(dev, CONTROL,
 				"Can't add mapping '%s', control id 0x%08x already exists\n",
-				mapping->name, mapping->id);
+				uvc_map_get_name(mapping), mapping->id);
 			ret = -EEXIST;
 			goto done;
 		}
@@ -2272,7 +2258,7 @@ int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
 		atomic_dec(&dev->nmappings);
 		uvc_dbg(dev, CONTROL,
 			"Can't add mapping '%s', maximum mappings count (%u) exceeded\n",
-			mapping->name, UVC_MAX_CONTROL_MAPPINGS);
+			uvc_map_get_name(mapping), UVC_MAX_CONTROL_MAPPINGS);
 		ret = -ENOMEM;
 		goto done;
 	}
@@ -2481,6 +2467,7 @@ static void uvc_ctrl_cleanup_mappings(struct uvc_device *dev,
 	list_for_each_entry_safe(mapping, nm, &ctrl->info.mappings, list) {
 		list_del(&mapping->list);
 		kfree(mapping->menu_info);
+		kfree(mapping->name);
 		kfree(mapping);
 	}
 }
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index d780065f3716..74d862c358fd 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -40,7 +40,13 @@ static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
 		return -ENOMEM;
 
 	map->id = xmap->id;
-	memcpy(map->name, xmap->name, sizeof(map->name));
+	/* Non standard control id. */
+	if (v4l2_ctrl_get_name(map->id) == NULL) {
+		map->name = kmemdup(xmap->name, sizeof(xmap->name),
+				    GFP_KERNEL);
+		if (!map->name)
+			return -ENOMEM;
+	}
 	memcpy(map->entity, xmap->entity, sizeof(map->entity));
 	map->selector = xmap->selector;
 	map->size = xmap->size;
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index a26bbec8d37b..dc20021f7ee0 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -240,7 +240,7 @@ struct uvc_control_mapping {
 	struct list_head ev_subs;
 
 	u32 id;
-	u8 name[32];
+	char *name;
 	u8 entity[16];
 	u8 selector;
 
-- 
2.31.0.rc2.261.g7f71774620-goog

Re: [PATCH v5 11/13] media: uvcvideo: Use control names from framework

[Hans Verkuil]

On 16/03/2021 19:00, Ricardo Ribalda wrote:
> The framework already contains a map of IDs to names, lets use it when
> possible.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> Suggested-by: Hans Verkuil <hverkuil@xs4all.nl>

Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Regards,

	Hans

> ---
>  drivers/media/usb/uvc/uvc_ctrl.c | 57 ++++++++++++--------------------
>  drivers/media/usb/uvc/uvc_v4l2.c |  8 ++++-
>  drivers/media/usb/uvc/uvcvideo.h |  2 +-
>  3 files changed, 30 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index 98614e1be829..efbdd49ad8ec 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -436,7 +436,6 @@ static void uvc_ctrl_set_rel_speed(struct uvc_control_mapping *mapping,
>  static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	{
>  		.id		= V4L2_CID_BRIGHTNESS,
> -		.name		= "Brightness",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_BRIGHTNESS_CONTROL,
>  		.size		= 16,
> @@ -446,7 +445,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_CONTRAST,
> -		.name		= "Contrast",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_CONTRAST_CONTROL,
>  		.size		= 16,
> @@ -456,7 +454,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_HUE,
> -		.name		= "Hue",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_HUE_CONTROL,
>  		.size		= 16,
> @@ -468,7 +465,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_SATURATION,
> -		.name		= "Saturation",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_SATURATION_CONTROL,
>  		.size		= 16,
> @@ -478,7 +474,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_SHARPNESS,
> -		.name		= "Sharpness",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_SHARPNESS_CONTROL,
>  		.size		= 16,
> @@ -488,7 +483,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_GAMMA,
> -		.name		= "Gamma",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_GAMMA_CONTROL,
>  		.size		= 16,
> @@ -498,7 +492,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_BACKLIGHT_COMPENSATION,
> -		.name		= "Backlight Compensation",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_BACKLIGHT_COMPENSATION_CONTROL,
>  		.size		= 16,
> @@ -508,7 +501,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_GAIN,
> -		.name		= "Gain",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_GAIN_CONTROL,
>  		.size		= 16,
> @@ -518,7 +510,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_POWER_LINE_FREQUENCY,
> -		.name		= "Power Line Frequency",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
>  		.size		= 2,
> @@ -530,7 +521,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_HUE_AUTO,
> -		.name		= "Hue, Auto",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_HUE_AUTO_CONTROL,
>  		.size		= 1,
> @@ -541,7 +531,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_EXPOSURE_AUTO,
> -		.name		= "Exposure, Auto",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_AE_MODE_CONTROL,
>  		.size		= 4,
> @@ -554,7 +543,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_EXPOSURE_AUTO_PRIORITY,
> -		.name		= "Exposure, Auto Priority",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_AE_PRIORITY_CONTROL,
>  		.size		= 1,
> @@ -564,7 +552,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_EXPOSURE_ABSOLUTE,
> -		.name		= "Exposure (Absolute)",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL,
>  		.size		= 32,
> @@ -576,7 +563,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_AUTO_WHITE_BALANCE,
> -		.name		= "White Balance Temperature, Auto",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL,
>  		.size		= 1,
> @@ -587,7 +573,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_WHITE_BALANCE_TEMPERATURE,
> -		.name		= "White Balance Temperature",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL,
>  		.size		= 16,
> @@ -599,7 +584,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_AUTO_WHITE_BALANCE,
> -		.name		= "White Balance Component, Auto",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL,
>  		.size		= 1,
> @@ -611,7 +595,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_BLUE_BALANCE,
> -		.name		= "White Balance Blue Component",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
>  		.size		= 16,
> @@ -623,7 +606,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_RED_BALANCE,
> -		.name		= "White Balance Red Component",
>  		.entity		= UVC_GUID_UVC_PROCESSING,
>  		.selector	= UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL,
>  		.size		= 16,
> @@ -635,7 +617,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_FOCUS_ABSOLUTE,
> -		.name		= "Focus (absolute)",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_FOCUS_ABSOLUTE_CONTROL,
>  		.size		= 16,
> @@ -647,7 +628,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_FOCUS_AUTO,
> -		.name		= "Focus, Auto",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_FOCUS_AUTO_CONTROL,
>  		.size		= 1,
> @@ -658,7 +638,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_IRIS_ABSOLUTE,
> -		.name		= "Iris, Absolute",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_IRIS_ABSOLUTE_CONTROL,
>  		.size		= 16,
> @@ -668,7 +647,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_IRIS_RELATIVE,
> -		.name		= "Iris, Relative",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_IRIS_RELATIVE_CONTROL,
>  		.size		= 8,
> @@ -678,7 +656,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_ZOOM_ABSOLUTE,
> -		.name		= "Zoom, Absolute",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_ZOOM_ABSOLUTE_CONTROL,
>  		.size		= 16,
> @@ -688,7 +665,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_ZOOM_CONTINUOUS,
> -		.name		= "Zoom, Continuous",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_ZOOM_RELATIVE_CONTROL,
>  		.size		= 0,
> @@ -700,7 +676,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_PAN_ABSOLUTE,
> -		.name		= "Pan (Absolute)",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_PANTILT_ABSOLUTE_CONTROL,
>  		.size		= 32,
> @@ -710,7 +685,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_TILT_ABSOLUTE,
> -		.name		= "Tilt (Absolute)",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_PANTILT_ABSOLUTE_CONTROL,
>  		.size		= 32,
> @@ -720,7 +694,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_PAN_SPEED,
> -		.name		= "Pan (Speed)",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_PANTILT_RELATIVE_CONTROL,
>  		.size		= 16,
> @@ -732,7 +705,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_TILT_SPEED,
> -		.name		= "Tilt (Speed)",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_PANTILT_RELATIVE_CONTROL,
>  		.size		= 16,
> @@ -744,7 +716,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_PRIVACY,
> -		.name		= "Privacy",
>  		.entity		= UVC_GUID_UVC_CAMERA,
>  		.selector	= UVC_CT_PRIVACY_CONTROL,
>  		.size		= 1,
> @@ -754,7 +725,6 @@ static const struct uvc_control_mapping uvc_ctrl_mappings[] = {
>  	},
>  	{
>  		.id		= V4L2_CID_PRIVACY,
> -		.name		= "Privacy",
>  		.entity		= UVC_GUID_EXT_GPIO_CONTROLLER,
>  		.selector	= UVC_CT_PRIVACY_CONTROL,
>  		.size		= 1,
> @@ -1076,6 +1046,20 @@ static int uvc_query_v4l2_class(struct uvc_video_chain *chain, u32 req_id,
>  	return 0;
>  }
>  
> +static const char *uvc_map_get_name(const struct uvc_control_mapping *map)
> +{
> +	const char *name;
> +
> +	if (map->name)
> +		return map->name;
> +
> +	name = v4l2_ctrl_get_name(map->id);
> +	if (name)
> +		return name;
> +
> +	return "Unknown Control";
> +}
> +
>  static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
>  	struct uvc_control *ctrl,
>  	struct uvc_control_mapping *mapping,
> @@ -1089,7 +1073,8 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
>  	memset(v4l2_ctrl, 0, sizeof(*v4l2_ctrl));
>  	v4l2_ctrl->id = mapping->id;
>  	v4l2_ctrl->type = mapping->v4l2_type;
> -	strscpy(v4l2_ctrl->name, mapping->name, sizeof(v4l2_ctrl->name));
> +	strscpy(v4l2_ctrl->name, uvc_map_get_name(mapping),
> +		sizeof(v4l2_ctrl->name));
>  	v4l2_ctrl->flags = 0;
>  
>  	if (!(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
> @@ -2196,7 +2181,8 @@ static int __uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
>  
>  	list_add_tail(&map->list, &ctrl->info.mappings);
>  	uvc_dbg(chain->dev, CONTROL, "Adding mapping '%s' to control %pUl/%u\n",
> -		map->name, ctrl->info.entity, ctrl->info.selector);
> +		uvc_map_get_name(map), ctrl->info.entity,
> +		ctrl->info.selector);
>  
>  	return 0;
>  }
> @@ -2214,7 +2200,7 @@ int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
>  	if (mapping->id & ~V4L2_CTRL_ID_MASK) {
>  		uvc_dbg(dev, CONTROL,
>  			"Can't add mapping '%s', control id 0x%08x is invalid\n",
> -			mapping->name, mapping->id);
> +			uvc_map_get_name(mapping), mapping->id);
>  		return -EINVAL;
>  	}
>  
> @@ -2261,7 +2247,7 @@ int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
>  		if (mapping->id == map->id) {
>  			uvc_dbg(dev, CONTROL,
>  				"Can't add mapping '%s', control id 0x%08x already exists\n",
> -				mapping->name, mapping->id);
> +				uvc_map_get_name(mapping), mapping->id);
>  			ret = -EEXIST;
>  			goto done;
>  		}
> @@ -2272,7 +2258,7 @@ int uvc_ctrl_add_mapping(struct uvc_video_chain *chain,
>  		atomic_dec(&dev->nmappings);
>  		uvc_dbg(dev, CONTROL,
>  			"Can't add mapping '%s', maximum mappings count (%u) exceeded\n",
> -			mapping->name, UVC_MAX_CONTROL_MAPPINGS);
> +			uvc_map_get_name(mapping), UVC_MAX_CONTROL_MAPPINGS);
>  		ret = -ENOMEM;
>  		goto done;
>  	}
> @@ -2481,6 +2467,7 @@ static void uvc_ctrl_cleanup_mappings(struct uvc_device *dev,
>  	list_for_each_entry_safe(mapping, nm, &ctrl->info.mappings, list) {
>  		list_del(&mapping->list);
>  		kfree(mapping->menu_info);
> +		kfree(mapping->name);
>  		kfree(mapping);
>  	}
>  }
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index d780065f3716..74d862c358fd 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -40,7 +40,13 @@ static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
>  		return -ENOMEM;
>  
>  	map->id = xmap->id;
> -	memcpy(map->name, xmap->name, sizeof(map->name));
> +	/* Non standard control id. */
> +	if (v4l2_ctrl_get_name(map->id) == NULL) {
> +		map->name = kmemdup(xmap->name, sizeof(xmap->name),
> +				    GFP_KERNEL);
> +		if (!map->name)
> +			return -ENOMEM;
> +	}
>  	memcpy(map->entity, xmap->entity, sizeof(map->entity));
>  	map->selector = xmap->selector;
>  	map->size = xmap->size;
> diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> index a26bbec8d37b..dc20021f7ee0 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -240,7 +240,7 @@ struct uvc_control_mapping {
>  	struct list_head ev_subs;
>  
>  	u32 id;
> -	u8 name[32];
> +	char *name;
>  	u8 entity[16];
>  	u8 selector;
>  
> 

[PATCH v5 12/13] media: v4l2-ioctl: Set error_idx to the right value

[Ricardo Ribalda]

If an error is found when validating the list of controls passed with
VIDIOC_G_EXT_CTRLS, then error_idx shall be set to ctrls->count to
indicate to userspace that no actual hardware was touched.

It would have been much nicer of course if error_idx could point to the
control index that failed the validation, but sadly that's not how the
API was designed.

Fixes v4l2-compliance:
Control ioctls (Input 0):
	warn: v4l2-test-controls.cpp(834): error_idx should be equal to count
	warn: v4l2-test-controls.cpp(855): error_idx should be equal to count
	test VIDIOC_G/S/TRY_EXT_CTRLS: OK

Fixes: 6fa6f831f095 ("media: v4l2-ctrls: add core request support")
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 9406e90ff805..936ae21a0e0e 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -2294,8 +2294,12 @@ static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
 					vfd, vfd->v4l2_dev->mdev, p);
 	if (ops->vidioc_g_ext_ctrls == NULL)
 		return -ENOTTY;
-	return check_ext_ctrls(p, 0) ? ops->vidioc_g_ext_ctrls(file, fh, p) :
-					-EINVAL;
+
+	if (check_ext_ctrls(p, 0))
+		return ops->vidioc_g_ext_ctrls(file, fh, p);
+
+	p->error_idx = p->count;
+	return -EINVAL;
 }
 
 static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
@@ -2315,8 +2319,11 @@ static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
 					vfd, vfd->v4l2_dev->mdev, p);
 	if (ops->vidioc_s_ext_ctrls == NULL)
 		return -ENOTTY;
-	return check_ext_ctrls(p, 0) ? ops->vidioc_s_ext_ctrls(file, fh, p) :
-					-EINVAL;
+	if (check_ext_ctrls(p, 0))
+		return ops->vidioc_s_ext_ctrls(file, fh, p);
+
+	p->error_idx = p->count;
+	return -EINVAL;
 }
 
 static int v4l_try_ext_ctrls(const struct v4l2_ioctl_ops *ops,
-- 
2.31.0.rc2.261.g7f71774620-goog

Re: [PATCH v5 12/13] media: v4l2-ioctl: Set error_idx to the right value

[Hans Verkuil]

On 16/03/2021 19:00, Ricardo Ribalda wrote:
> If an error is found when validating the list of controls passed with
> VIDIOC_G_EXT_CTRLS, then error_idx shall be set to ctrls->count to
> indicate to userspace that no actual hardware was touched.
> 
> It would have been much nicer of course if error_idx could point to the
> control index that failed the validation, but sadly that's not how the
> API was designed.
> 
> Fixes v4l2-compliance:
> Control ioctls (Input 0):
> 	warn: v4l2-test-controls.cpp(834): error_idx should be equal to count
> 	warn: v4l2-test-controls.cpp(855): error_idx should be equal to count
> 	test VIDIOC_G/S/TRY_EXT_CTRLS: OK
> 
> Fixes: 6fa6f831f095 ("media: v4l2-ctrls: add core request support")
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
>  drivers/media/v4l2-core/v4l2-ioctl.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 9406e90ff805..936ae21a0e0e 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -2294,8 +2294,12 @@ static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
>  					vfd, vfd->v4l2_dev->mdev, p);
>  	if (ops->vidioc_g_ext_ctrls == NULL)
>  		return -ENOTTY;
> -	return check_ext_ctrls(p, 0) ? ops->vidioc_g_ext_ctrls(file, fh, p) :
> -					-EINVAL;
> +
> +	if (check_ext_ctrls(p, 0))
> +		return ops->vidioc_g_ext_ctrls(file, fh, p);
> +
> +	p->error_idx = p->count;
> +	return -EINVAL;
>  }
>  
>  static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> @@ -2315,8 +2319,11 @@ static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
>  					vfd, vfd->v4l2_dev->mdev, p);
>  	if (ops->vidioc_s_ext_ctrls == NULL)
>  		return -ENOTTY;
> -	return check_ext_ctrls(p, 0) ? ops->vidioc_s_ext_ctrls(file, fh, p) :
> -					-EINVAL;
> +	if (check_ext_ctrls(p, 0))
> +		return ops->vidioc_s_ext_ctrls(file, fh, p);
> +
> +	p->error_idx = p->count;
> +	return -EINVAL;
>  }
>  
>  static int v4l_try_ext_ctrls(const struct v4l2_ioctl_ops *ops,
> 

No, this patch is wrong. In all cases where check_ext_ctrls() is called the
code had already set error_idx to count. The real culprit is check_ext_ctrls()
that sets error_idx to the index of the failing control. But it can only do that
for the TRY ioctl.

In my review of patch 1 I mentioned that adding a bool is_get is a good idea.
I now this that it is best to pass the ioctl (G/S/TRY_EXT_CTRLS) instead and
based on that set error_idx here. In fact, if v4l_g/s_ctrl pass G/S_CTRL as the
ioctl argument to check_ext_ctrls(), then the allow_priv argument can be dropped
as well, since that can be decided based on the ioctl for which this function is
called.

Regards,

	Hans

[PATCH v5 13/13] uvc: use vb2 ioctl and fop helpers

[Ricardo Ribalda]

From: Hans Verkuil <hverkuil@xs4all.nl>

When uvc was written the vb2 ioctl and file operation helpers didn't exist.

This patch switches uvc over to those helpers, which removes a lot of boilerplate
code and simplifies VIDIOC_G/S_PRIORITY handling and allows us to drop the
'privileges' scheme, since that's now handled inside the vb2 helpers.

This makes it possible for uvc to pass the v4l2-compliance streaming tests.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/media/usb/uvc/uvc_driver.c   |   7 +-
 drivers/media/usb/uvc/uvc_metadata.c |   8 +-
 drivers/media/usb/uvc/uvc_queue.c    | 143 -------------
 drivers/media/usb/uvc/uvc_v4l2.c     | 288 ++-------------------------
 drivers/media/usb/uvc/uvcvideo.h     |  32 ---
 5 files changed, 25 insertions(+), 453 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 76ab6acecbc9..1a38ea31e218 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1911,7 +1911,6 @@ static struct uvc_video_chain *uvc_alloc_chain(struct uvc_device *dev)
 	INIT_LIST_HEAD(&chain->entities);
 	mutex_init(&chain->ctrl_mutex);
 	chain->dev = dev;
-	v4l2_prio_init(&chain->prio);
 
 	return chain;
 }
@@ -2181,7 +2180,7 @@ int uvc_register_video_device(struct uvc_device *dev,
 	vdev->fops = fops;
 	vdev->ioctl_ops = ioctl_ops;
 	vdev->release = uvc_release;
-	vdev->prio = &stream->chain->prio;
+	vdev->queue = &queue->queue;
 	if (type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
 		vdev->vfl_dir = VFL_DIR_TX;
 	else
@@ -2546,8 +2545,8 @@ static int __uvc_resume(struct usb_interface *intf, int reset)
 		if (stream->intf == intf) {
 			ret = uvc_video_resume(stream, reset);
 			if (ret < 0)
-				uvc_queue_streamoff(&stream->queue,
-						    stream->queue.queue.type);
+				vb2_streamoff(&stream->queue.queue,
+					      stream->queue.queue.type);
 			return ret;
 		}
 	}
diff --git a/drivers/media/usb/uvc/uvc_metadata.c b/drivers/media/usb/uvc/uvc_metadata.c
index b6279ad7ac84..849d8e5ab75d 100644
--- a/drivers/media/usb/uvc/uvc_metadata.c
+++ b/drivers/media/usb/uvc/uvc_metadata.c
@@ -96,7 +96,7 @@ static int uvc_meta_v4l2_set_format(struct file *file, void *fh,
 	 */
 	mutex_lock(&stream->mutex);
 
-	if (uvc_queue_allocated(&stream->queue))
+	if (vb2_is_busy(&stream->meta.queue.queue))
 		ret = -EBUSY;
 	else
 		stream->meta.format = fmt->dataformat;
@@ -164,12 +164,6 @@ int uvc_meta_register(struct uvc_streaming *stream)
 
 	stream->meta.format = V4L2_META_FMT_UVC;
 
-	/*
-	 * The video interface queue uses manual locking and thus does not set
-	 * the queue pointer. Set it manually here.
-	 */
-	vdev->queue = &queue->queue;
-
 	return uvc_register_video_device(dev, stream, vdev, queue,
 					 V4L2_BUF_TYPE_META_CAPTURE,
 					 &uvc_meta_fops, &uvc_meta_ioctl_ops);
diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index 21a907d32bb7..437e48b32480 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -247,153 +247,10 @@ int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
 	return 0;
 }
 
-void uvc_queue_release(struct uvc_video_queue *queue)
-{
-	mutex_lock(&queue->mutex);
-	vb2_queue_release(&queue->queue);
-	mutex_unlock(&queue->mutex);
-}
-
-/* -----------------------------------------------------------------------------
- * V4L2 queue operations
- */
-
-int uvc_request_buffers(struct uvc_video_queue *queue,
-			struct v4l2_requestbuffers *rb)
-{
-	int ret;
-
-	mutex_lock(&queue->mutex);
-	ret = vb2_reqbufs(&queue->queue, rb);
-	mutex_unlock(&queue->mutex);
-
-	return ret ? ret : rb->count;
-}
-
-int uvc_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
-{
-	int ret;
-
-	mutex_lock(&queue->mutex);
-	ret = vb2_querybuf(&queue->queue, buf);
-	mutex_unlock(&queue->mutex);
-
-	return ret;
-}
-
-int uvc_create_buffers(struct uvc_video_queue *queue,
-		       struct v4l2_create_buffers *cb)
-{
-	int ret;
-
-	mutex_lock(&queue->mutex);
-	ret = vb2_create_bufs(&queue->queue, cb);
-	mutex_unlock(&queue->mutex);
-
-	return ret;
-}
-
-int uvc_queue_buffer(struct uvc_video_queue *queue,
-		     struct media_device *mdev, struct v4l2_buffer *buf)
-{
-	int ret;
-
-	mutex_lock(&queue->mutex);
-	ret = vb2_qbuf(&queue->queue, mdev, buf);
-	mutex_unlock(&queue->mutex);
-
-	return ret;
-}
-
-int uvc_export_buffer(struct uvc_video_queue *queue,
-		      struct v4l2_exportbuffer *exp)
-{
-	int ret;
-
-	mutex_lock(&queue->mutex);
-	ret = vb2_expbuf(&queue->queue, exp);
-	mutex_unlock(&queue->mutex);
-
-	return ret;
-}
-
-int uvc_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf,
-		       int nonblocking)
-{
-	int ret;
-
-	mutex_lock(&queue->mutex);
-	ret = vb2_dqbuf(&queue->queue, buf, nonblocking);
-	mutex_unlock(&queue->mutex);
-
-	return ret;
-}
-
-int uvc_queue_streamon(struct uvc_video_queue *queue, enum v4l2_buf_type type)
-{
-	int ret;
-
-	mutex_lock(&queue->mutex);
-	ret = vb2_streamon(&queue->queue, type);
-	mutex_unlock(&queue->mutex);
-
-	return ret;
-}
-
-int uvc_queue_streamoff(struct uvc_video_queue *queue, enum v4l2_buf_type type)
-{
-	int ret;
-
-	mutex_lock(&queue->mutex);
-	ret = vb2_streamoff(&queue->queue, type);
-	mutex_unlock(&queue->mutex);
-
-	return ret;
-}
-
-int uvc_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma)
-{
-	return vb2_mmap(&queue->queue, vma);
-}
-
-#ifndef CONFIG_MMU
-unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
-		unsigned long pgoff)
-{
-	return vb2_get_unmapped_area(&queue->queue, 0, 0, pgoff, 0);
-}
-#endif
-
-__poll_t uvc_queue_poll(struct uvc_video_queue *queue, struct file *file,
-			    poll_table *wait)
-{
-	__poll_t ret;
-
-	mutex_lock(&queue->mutex);
-	ret = vb2_poll(&queue->queue, file, wait);
-	mutex_unlock(&queue->mutex);
-
-	return ret;
-}
-
 /* -----------------------------------------------------------------------------
  *
  */
 
-/*
- * Check if buffers have been allocated.
- */
-int uvc_queue_allocated(struct uvc_video_queue *queue)
-{
-	int allocated;
-
-	mutex_lock(&queue->mutex);
-	allocated = vb2_is_busy(&queue->queue);
-	mutex_unlock(&queue->mutex);
-
-	return allocated;
-}
-
 /*
  * Cancel the video buffers queue.
  *
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 74d862c358fd..a5454bcc3feb 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -352,17 +352,13 @@ static int uvc_v4l2_set_format(struct uvc_streaming *stream,
 		return ret;
 
 	mutex_lock(&stream->mutex);
-
-	if (uvc_queue_allocated(&stream->queue)) {
+	if (vb2_is_busy(&stream->queue.queue)) {
 		ret = -EBUSY;
-		goto done;
+	} else {
+		stream->ctrl = probe;
+		stream->cur_format = format;
+		stream->cur_frame = frame;
 	}
-
-	stream->ctrl = probe;
-	stream->cur_format = format;
-	stream->cur_frame = frame;
-
-done:
 	mutex_unlock(&stream->mutex);
 	return ret;
 }
@@ -489,62 +485,6 @@ static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
 	return 0;
 }
 
-/* ------------------------------------------------------------------------
- * Privilege management
- */
-
-/*
- * Privilege management is the multiple-open implementation basis. The current
- * implementation is completely transparent for the end-user and doesn't
- * require explicit use of the VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY ioctls.
- * Those ioctls enable finer control on the device (by making possible for a
- * user to request exclusive access to a device), but are not mature yet.
- * Switching to the V4L2 priority mechanism might be considered in the future
- * if this situation changes.
- *
- * Each open instance of a UVC device can either be in a privileged or
- * unprivileged state. Only a single instance can be in a privileged state at
- * a given time. Trying to perform an operation that requires privileges will
- * automatically acquire the required privileges if possible, or return -EBUSY
- * otherwise. Privileges are dismissed when closing the instance or when
- * freeing the video buffers using VIDIOC_REQBUFS.
- *
- * Operations that require privileges are:
- *
- * - VIDIOC_S_INPUT
- * - VIDIOC_S_PARM
- * - VIDIOC_S_FMT
- * - VIDIOC_REQBUFS
- */
-static int uvc_acquire_privileges(struct uvc_fh *handle)
-{
-	/* Always succeed if the handle is already privileged. */
-	if (handle->state == UVC_HANDLE_ACTIVE)
-		return 0;
-
-	/* Check if the device already has a privileged handle. */
-	if (atomic_inc_return(&handle->stream->active) != 1) {
-		atomic_dec(&handle->stream->active);
-		return -EBUSY;
-	}
-
-	handle->state = UVC_HANDLE_ACTIVE;
-	return 0;
-}
-
-static void uvc_dismiss_privileges(struct uvc_fh *handle)
-{
-	if (handle->state == UVC_HANDLE_ACTIVE)
-		atomic_dec(&handle->stream->active);
-
-	handle->state = UVC_HANDLE_PASSIVE;
-}
-
-static int uvc_has_privileges(struct uvc_fh *handle)
-{
-	return handle->state == UVC_HANDLE_ACTIVE;
-}
-
 /* ------------------------------------------------------------------------
  * V4L2 file operations
  */
@@ -587,7 +527,6 @@ static int uvc_v4l2_open(struct file *file)
 	v4l2_fh_add(&handle->vfh);
 	handle->chain = stream->chain;
 	handle->stream = stream;
-	handle->state = UVC_HANDLE_PASSIVE;
 	file->private_data = handle;
 
 	return 0;
@@ -600,15 +539,8 @@ static int uvc_v4l2_release(struct file *file)
 
 	uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
 
-	/* Only free resources if this is a privileged handle. */
-	if (uvc_has_privileges(handle))
-		uvc_queue_release(&stream->queue);
-
 	/* Release the file handle. */
-	uvc_dismiss_privileges(handle);
-	v4l2_fh_del(&handle->vfh);
-	v4l2_fh_exit(&handle->vfh);
-	kfree(handle);
+	vb2_fop_release(file);
 	file->private_data = NULL;
 
 	mutex_lock(&stream->dev->lock);
@@ -701,11 +633,6 @@ static int uvc_ioctl_s_fmt_vid_cap(struct file *file, void *fh,
 {
 	struct uvc_fh *handle = fh;
 	struct uvc_streaming *stream = handle->stream;
-	int ret;
-
-	ret = uvc_acquire_privileges(handle);
-	if (ret < 0)
-		return ret;
 
 	return uvc_v4l2_set_format(stream, fmt);
 }
@@ -715,11 +642,6 @@ static int uvc_ioctl_s_fmt_vid_out(struct file *file, void *fh,
 {
 	struct uvc_fh *handle = fh;
 	struct uvc_streaming *stream = handle->stream;
-	int ret;
-
-	ret = uvc_acquire_privileges(handle);
-	if (ret < 0)
-		return ret;
 
 	return uvc_v4l2_set_format(stream, fmt);
 }
@@ -744,124 +666,6 @@ static int uvc_ioctl_try_fmt_vid_out(struct file *file, void *fh,
 	return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 }
 
-static int uvc_ioctl_reqbufs(struct file *file, void *fh,
-			     struct v4l2_requestbuffers *rb)
-{
-	struct uvc_fh *handle = fh;
-	struct uvc_streaming *stream = handle->stream;
-	int ret;
-
-	ret = uvc_acquire_privileges(handle);
-	if (ret < 0)
-		return ret;
-
-	mutex_lock(&stream->mutex);
-	ret = uvc_request_buffers(&stream->queue, rb);
-	mutex_unlock(&stream->mutex);
-	if (ret < 0)
-		return ret;
-
-	if (ret == 0)
-		uvc_dismiss_privileges(handle);
-
-	return 0;
-}
-
-static int uvc_ioctl_querybuf(struct file *file, void *fh,
-			      struct v4l2_buffer *buf)
-{
-	struct uvc_fh *handle = fh;
-	struct uvc_streaming *stream = handle->stream;
-
-	if (!uvc_has_privileges(handle))
-		return -EBUSY;
-
-	return uvc_query_buffer(&stream->queue, buf);
-}
-
-static int uvc_ioctl_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
-{
-	struct uvc_fh *handle = fh;
-	struct uvc_streaming *stream = handle->stream;
-
-	if (!uvc_has_privileges(handle))
-		return -EBUSY;
-
-	return uvc_queue_buffer(&stream->queue,
-				stream->vdev.v4l2_dev->mdev, buf);
-}
-
-static int uvc_ioctl_expbuf(struct file *file, void *fh,
-			    struct v4l2_exportbuffer *exp)
-{
-	struct uvc_fh *handle = fh;
-	struct uvc_streaming *stream = handle->stream;
-
-	if (!uvc_has_privileges(handle))
-		return -EBUSY;
-
-	return uvc_export_buffer(&stream->queue, exp);
-}
-
-static int uvc_ioctl_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
-{
-	struct uvc_fh *handle = fh;
-	struct uvc_streaming *stream = handle->stream;
-
-	if (!uvc_has_privileges(handle))
-		return -EBUSY;
-
-	return uvc_dequeue_buffer(&stream->queue, buf,
-				  file->f_flags & O_NONBLOCK);
-}
-
-static int uvc_ioctl_create_bufs(struct file *file, void *fh,
-				  struct v4l2_create_buffers *cb)
-{
-	struct uvc_fh *handle = fh;
-	struct uvc_streaming *stream = handle->stream;
-	int ret;
-
-	ret = uvc_acquire_privileges(handle);
-	if (ret < 0)
-		return ret;
-
-	return uvc_create_buffers(&stream->queue, cb);
-}
-
-static int uvc_ioctl_streamon(struct file *file, void *fh,
-			      enum v4l2_buf_type type)
-{
-	struct uvc_fh *handle = fh;
-	struct uvc_streaming *stream = handle->stream;
-	int ret;
-
-	if (!uvc_has_privileges(handle))
-		return -EBUSY;
-
-	mutex_lock(&stream->mutex);
-	ret = uvc_queue_streamon(&stream->queue, type);
-	mutex_unlock(&stream->mutex);
-
-	return ret;
-}
-
-static int uvc_ioctl_streamoff(struct file *file, void *fh,
-			       enum v4l2_buf_type type)
-{
-	struct uvc_fh *handle = fh;
-	struct uvc_streaming *stream = handle->stream;
-
-	if (!uvc_has_privileges(handle))
-		return -EBUSY;
-
-	mutex_lock(&stream->mutex);
-	uvc_queue_streamoff(&stream->queue, type);
-	mutex_unlock(&stream->mutex);
-
-	return 0;
-}
-
 static int uvc_ioctl_enum_input(struct file *file, void *fh,
 				struct v4l2_input *input)
 {
@@ -929,13 +733,12 @@ static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
 static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
 {
 	struct uvc_fh *handle = fh;
+	struct uvc_streaming *stream = handle->stream;
 	struct uvc_video_chain *chain = handle->chain;
-	int ret;
 	u32 i;
 
-	ret = uvc_acquire_privileges(handle);
-	if (ret < 0)
-		return ret;
+	if (vb2_is_busy(&stream->queue.queue))
+		return -EBUSY;
 
 	if (chain->selector == NULL ||
 	    (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
@@ -1228,11 +1031,6 @@ static int uvc_ioctl_s_parm(struct file *file, void *fh,
 {
 	struct uvc_fh *handle = fh;
 	struct uvc_streaming *stream = handle->stream;
-	int ret;
-
-	ret = uvc_acquire_privileges(handle);
-	if (ret < 0)
-		return ret;
 
 	return uvc_v4l2_set_streamparm(stream, parm);
 }
@@ -1500,50 +1298,6 @@ static long uvc_v4l2_compat_ioctl32(struct file *file,
 }
 #endif
 
-static ssize_t uvc_v4l2_read(struct file *file, char __user *data,
-		    size_t count, loff_t *ppos)
-{
-	struct uvc_fh *handle = file->private_data;
-	struct uvc_streaming *stream = handle->stream;
-
-	uvc_dbg(stream->dev, CALLS, "%s: not implemented\n", __func__);
-	return -EINVAL;
-}
-
-static int uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	struct uvc_fh *handle = file->private_data;
-	struct uvc_streaming *stream = handle->stream;
-
-	uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
-
-	return uvc_queue_mmap(&stream->queue, vma);
-}
-
-static __poll_t uvc_v4l2_poll(struct file *file, poll_table *wait)
-{
-	struct uvc_fh *handle = file->private_data;
-	struct uvc_streaming *stream = handle->stream;
-
-	uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
-
-	return uvc_queue_poll(&stream->queue, file, wait);
-}
-
-#ifndef CONFIG_MMU
-static unsigned long uvc_v4l2_get_unmapped_area(struct file *file,
-		unsigned long addr, unsigned long len, unsigned long pgoff,
-		unsigned long flags)
-{
-	struct uvc_fh *handle = file->private_data;
-	struct uvc_streaming *stream = handle->stream;
-
-	uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
-
-	return uvc_queue_get_unmapped_area(&stream->queue, pgoff);
-}
-#endif
-
 const struct v4l2_ioctl_ops uvc_ioctl_ops = {
 	.vidioc_querycap = uvc_ioctl_querycap,
 	.vidioc_enum_fmt_vid_cap = uvc_ioctl_enum_fmt_vid_cap,
@@ -1554,14 +1308,15 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = {
 	.vidioc_s_fmt_vid_out = uvc_ioctl_s_fmt_vid_out,
 	.vidioc_try_fmt_vid_cap = uvc_ioctl_try_fmt_vid_cap,
 	.vidioc_try_fmt_vid_out = uvc_ioctl_try_fmt_vid_out,
-	.vidioc_reqbufs = uvc_ioctl_reqbufs,
-	.vidioc_querybuf = uvc_ioctl_querybuf,
-	.vidioc_qbuf = uvc_ioctl_qbuf,
-	.vidioc_expbuf = uvc_ioctl_expbuf,
-	.vidioc_dqbuf = uvc_ioctl_dqbuf,
-	.vidioc_create_bufs = uvc_ioctl_create_bufs,
-	.vidioc_streamon = uvc_ioctl_streamon,
-	.vidioc_streamoff = uvc_ioctl_streamoff,
+	.vidioc_reqbufs = vb2_ioctl_reqbufs,
+	.vidioc_querybuf = vb2_ioctl_querybuf,
+	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+	.vidioc_qbuf = vb2_ioctl_qbuf,
+	.vidioc_expbuf = vb2_ioctl_expbuf,
+	.vidioc_dqbuf = vb2_ioctl_dqbuf,
+	.vidioc_create_bufs = vb2_ioctl_create_bufs,
+	.vidioc_streamon = vb2_ioctl_streamon,
+	.vidioc_streamoff = vb2_ioctl_streamoff,
 	.vidioc_enum_input = uvc_ioctl_enum_input,
 	.vidioc_g_input = uvc_ioctl_g_input,
 	.vidioc_s_input = uvc_ioctl_s_input,
@@ -1591,11 +1346,10 @@ const struct v4l2_file_operations uvc_fops = {
 #ifdef CONFIG_COMPAT
 	.compat_ioctl32	= uvc_v4l2_compat_ioctl32,
 #endif
-	.read		= uvc_v4l2_read,
-	.mmap		= uvc_v4l2_mmap,
-	.poll		= uvc_v4l2_poll,
+	.mmap		= vb2_fop_mmap,
+	.poll		= vb2_fop_poll,
 #ifndef CONFIG_MMU
-	.get_unmapped_area = uvc_v4l2_get_unmapped_area,
+	.get_unmapped_area = vb2_fop_get_unmapped_area,
 #endif
 };
 
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index dc20021f7ee0..bd28813c5649 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -477,7 +477,6 @@ struct uvc_video_chain {
 
 	struct mutex ctrl_mutex;		/* Protects ctrl.info */
 
-	struct v4l2_prio_state prio;		/* V4L2 priority state */
 	u32 caps;				/* V4L2 chain-wide caps */
 	u8 ctrl_class_bitmap;			/* Bitmap of valid classes */
 };
@@ -714,16 +713,10 @@ struct uvc_device {
 	struct uvc_entity *gpio_unit;
 };
 
-enum uvc_handle_state {
-	UVC_HANDLE_PASSIVE	= 0,
-	UVC_HANDLE_ACTIVE	= 1,
-};
-
 struct uvc_fh {
 	struct v4l2_fh vfh;
 	struct uvc_video_chain *chain;
 	struct uvc_streaming *stream;
-	enum uvc_handle_state state;
 };
 
 struct uvc_driver {
@@ -788,36 +781,11 @@ struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id);
 /* Video buffers queue management. */
 int uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
 		   int drop_corrupted);
-void uvc_queue_release(struct uvc_video_queue *queue);
-int uvc_request_buffers(struct uvc_video_queue *queue,
-			struct v4l2_requestbuffers *rb);
-int uvc_query_buffer(struct uvc_video_queue *queue,
-		     struct v4l2_buffer *v4l2_buf);
-int uvc_create_buffers(struct uvc_video_queue *queue,
-		       struct v4l2_create_buffers *v4l2_cb);
-int uvc_queue_buffer(struct uvc_video_queue *queue,
-		     struct media_device *mdev,
-		     struct v4l2_buffer *v4l2_buf);
-int uvc_export_buffer(struct uvc_video_queue *queue,
-		      struct v4l2_exportbuffer *exp);
-int uvc_dequeue_buffer(struct uvc_video_queue *queue,
-		       struct v4l2_buffer *v4l2_buf, int nonblocking);
-int uvc_queue_streamon(struct uvc_video_queue *queue, enum v4l2_buf_type type);
-int uvc_queue_streamoff(struct uvc_video_queue *queue, enum v4l2_buf_type type);
 void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
 struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
 					 struct uvc_buffer *buf);
 struct uvc_buffer *uvc_queue_get_current_buffer(struct uvc_video_queue *queue);
 void uvc_queue_buffer_release(struct uvc_buffer *buf);
-int uvc_queue_mmap(struct uvc_video_queue *queue,
-		   struct vm_area_struct *vma);
-__poll_t uvc_queue_poll(struct uvc_video_queue *queue, struct file *file,
-			poll_table *wait);
-#ifndef CONFIG_MMU
-unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
-					  unsigned long pgoff);
-#endif
-int uvc_queue_allocated(struct uvc_video_queue *queue);
 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
 {
 	return vb2_is_streaming(&queue->queue);
-- 
2.31.0.rc2.261.g7f71774620-goog