[PATCH v3 0/8] Fix v4l2-compliance errors

[PATCH v3 0/8] Fix v4l2-compliance errors

[Ricardo Ribalda]

In my computer I am getting this output for

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: 9
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: 9

We are still not compliant with v4l2-compliance -s:

Streaming ioctls:
        test read/write: OK (Not Supported)
        test blocking wait: OK
                fail: v4l2-test-buffers.cpp(1265):
node->streamon(q.g_type()) != EINVAL
        test MMAP (no poll): FAIL
                fail: v4l2-test-buffers.cpp(1265):
node->streamon(q.g_type()) != EINVAL
        test MMAP (select): FAIL
                fail: v4l2-test-buffers.cpp(1265):
node->streamon(q.g_type()) != EINVAL
        test MMAP (epoll): FAIL

But fixing that will probably require a lot of changes in the driver
that are already implemented in the vb2 helpers. It is better to
continue Hans work on that:
https://git.linuxtv.org/hverkuil/media_tree.git/commit/?h=uvc-4.19&id=a6a0a05f643521d29a4c1e551b0be73ce66b7108

Changelog v2 (Thanks to Hans and Laurent)

- Reimplement the CTRL_CLASS as a patch on queryctl
- Do not return -EIO for case 8
- Handle request bug and which_def multiclass in core

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

Ricardo Ribalda (7):
  media: v4l2-ioctl: Fix check_ext_ctrls
  media: uvcvideo: Set capability in s_param
  media: uvcvideo: Return -EIO for control errors
  media: uvcvideo: set error_idx to count on EACCESS
  media: uvcvideo: refactor __uvc_ctrl_add_mapping
  media: uvcvideo: Add support for V4L2_CTRL_TYPE_CTRL_CLASS
  media: uvcvideo: Set a different name for the metadata entity

 drivers/media/usb/uvc/uvc_ctrl.c     | 137 +++++++++++--
 drivers/media/usb/uvc/uvc_driver.c   |  36 +++-
 drivers/media/usb/uvc/uvc_metadata.c |   8 +-
 drivers/media/usb/uvc/uvc_queue.c    | 131 -------------
 drivers/media/usb/uvc/uvc_v4l2.c     | 280 +++------------------------
 drivers/media/usb/uvc/uvc_video.c    |   5 +
 drivers/media/usb/uvc/uvcvideo.h     |  34 +---
 drivers/media/v4l2-core/v4l2-ioctl.c |  25 ++-
 8 files changed, 206 insertions(+), 450 deletions(-)

-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v3 1/8] 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

[PATCH v3 2/8] 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 v3 3/8] 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 v3 4/8] media: uvcvideo: set error_idx to count on EACCESS

[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):
                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>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/media/usb/uvc/uvc_v4l2.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 157310c0ca87..36eb48622d48 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1073,7 +1073,8 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
 		ret = uvc_ctrl_get(chain, ctrl);
 		if (ret < 0) {
 			uvc_ctrl_rollback(handle);
-			ctrls->error_idx = i;
+			ctrls->error_idx = (ret == -EACCES) ?
+						ctrls->count : i;
 			return ret;
 		}
 	}
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v3 5/8] 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.

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..90ecdc24d70a 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 ret;
+}
+
 /*
  * 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 v3 6/8] 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 | 96 ++++++++++++++++++++++++++++++++
 drivers/media/usb/uvc/uvcvideo.h |  6 ++
 2 files changed, 102 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 90ecdc24d70a..5bb9e7696fe5 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -357,6 +357,17 @@ static const struct uvc_control_info uvc_ctrls[] = {
 	},
 };
 
+static const struct uvc_control_class uvc_control_class[] = {
+	{
+		.id		= V4L2_CID_CAMERA_CLASS,
+		.name		= "Camera Controls",
+	},
+	{
+		.id		= V4L2_CID_USER_CLASS,
+		.name		= "User Controls",
+	},
+};
+
 static const struct uvc_menu_info power_line_frequency_controls[] = {
 	{ 0, "Disabled" },
 	{ 1, "50 Hz" },
@@ -1024,6 +1035,49 @@ 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, uvc_control_class[idx].name,
+		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 +1181,31 @@ 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 +1499,11 @@ 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 +1537,10 @@ 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 +1658,9 @@ 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 +1680,9 @@ 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 +2149,7 @@ 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 +2173,14 @@ 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..1f17e4253673 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -262,6 +262,11 @@ struct uvc_control_mapping {
 		    u8 *data);
 };
 
+struct uvc_control_class {
+	u32 id;
+	char name[32];
+};
+
 struct uvc_control {
 	struct uvc_entity *entity;
 	struct uvc_control_info info;
@@ -475,6 +480,7 @@ 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 v3 7/8] media: uvcvideo: Set a different name for the metadata entity

[Ricardo Ribalda]

All the entities must have a unique name. And now that we are at it, we
append the entity->id to the name to avoid collisions on 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>
---
 drivers/media/usb/uvc/uvc_driver.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 35873cf2773d..6c928e708615 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2154,6 +2154,18 @@ static void uvc_unregister_video(struct uvc_device *dev)
 #endif
 }
 
+static int uvc_oterm_id(struct uvc_video_chain *chain)
+{
+	struct uvc_entity *entity;
+
+	list_for_each_entry(entity, &chain->entities, chain) {
+		if (UVC_ENTITY_IS_OTERM(entity))
+			return entity->id;
+	}
+
+	return -1;
+}
+
 int uvc_register_video_device(struct uvc_device *dev,
 			      struct uvc_streaming *stream,
 			      struct video_device *vdev,
@@ -2162,6 +2174,8 @@ int uvc_register_video_device(struct uvc_device *dev,
 			      const struct v4l2_file_operations *fops,
 			      const struct v4l2_ioctl_ops *ioctl_ops)
 {
+	char prefix[sizeof(vdev->name) - 9];
+	const char *suffix;
 	int ret;
 
 	/* Initialize the video buffers queue. */
@@ -2190,16 +2204,21 @@ 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;
+		suffix = "video";
 		break;
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 		vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
+		suffix = "out";
 		break;
 	case V4L2_BUF_TYPE_META_CAPTURE:
 		vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
+		suffix = "meta";
 		break;
 	}
 
-	strscpy(vdev->name, dev->name, sizeof(vdev->name));
+	strscpy(prefix, dev->name, sizeof(prefix));
+	snprintf(vdev->name, sizeof(vdev->name), "%s-%d %s", prefix,
+		 uvc_oterm_id(stream->chain), suffix);
 
 	/*
 	 * Set the driver data before calling video_register_device, otherwise
-- 
2.31.0.rc2.261.g7f71774620-goog

[PATCH v3 8/8] 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    | 131 -------------
 drivers/media/usb/uvc/uvc_v4l2.c     | 272 ++-------------------------
 drivers/media/usb/uvc/uvcvideo.h     |  28 ---
 5 files changed, 24 insertions(+), 422 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 6c928e708615..b9f3984e9f80 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;
 }
@@ -2194,7 +2193,7 @@ 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
@@ -2560,8 +2559,8 @@ 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..2f52cdc62929 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->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..fba9646c8ba5 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -247,115 +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)
@@ -364,36 +259,10 @@ unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
 }
 #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 36eb48622d48..5a4b192ddecf 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -346,17 +346,13 @@ 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;
 }
@@ -483,62 +479,6 @@ 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
  */
@@ -581,7 +521,6 @@ 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;
@@ -594,15 +533,8 @@ 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);
@@ -696,11 +628,6 @@ 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);
 }
@@ -710,11 +637,6 @@ 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);
 }
@@ -739,124 +661,6 @@ 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)
 {
@@ -924,13 +728,12 @@ 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)) {
@@ -1191,11 +994,6 @@ 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);
 }
@@ -1463,36 +1261,6 @@ 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,
@@ -1517,14 +1285,15 @@ 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,
@@ -1554,9 +1323,8 @@ 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,
 #endif
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 1f17e4253673..b478bb6efab5 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -478,7 +478,6 @@ 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 */
 };
@@ -715,16 +714,10 @@ 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 {
@@ -789,36 +782,15 @@ 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

Re: [PATCH v3 8/8] uvc: use vb2 ioctl and fop helpers

[Hans Verkuil]

On 12/03/2021 13:48, Ricardo Ribalda wrote:
> 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    | 131 -------------
>  drivers/media/usb/uvc/uvc_v4l2.c     | 272 ++-------------------------
>  drivers/media/usb/uvc/uvcvideo.h     |  28 ---
>  5 files changed, 24 insertions(+), 422 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index 6c928e708615..b9f3984e9f80 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;
>  }
> @@ -2194,7 +2193,7 @@ 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
> @@ -2560,8 +2559,8 @@ 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..2f52cdc62929 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->queue.queue))

This should be &stream->meta.queue.queue. That explains this failure that I get
with v4l2-compliance -d1 when streaming with v4l2-ctl --stream-mmap:

fail: v4l2-test-formats.cpp(452): expected EINVAL, but got 16 when getting format for buftype 13
        test VIDIOC_S_FMT: FAIL

Regards,

	Hans

Re: [PATCH v3 7/8] media: uvcvideo: Set a different name for the metadata entity

[Laurent Pinchart]

Hi Ricardo,

Thank you for the patch.

On Fri, Mar 12, 2021 at 01:48:29PM +0100, Ricardo Ribalda wrote:
> All the entities must have a unique name. And now that we are at it, we
> append the entity->id to the name to avoid collisions on 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>
> ---
>  drivers/media/usb/uvc/uvc_driver.c | 21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index 35873cf2773d..6c928e708615 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -2154,6 +2154,18 @@ static void uvc_unregister_video(struct uvc_device *dev)
>  #endif
>  }
>  
> +static int uvc_oterm_id(struct uvc_video_chain *chain)
> +{
> +	struct uvc_entity *entity;
> +
> +	list_for_each_entry(entity, &chain->entities, chain) {
> +		if (UVC_ENTITY_IS_OTERM(entity))
> +			return entity->id;

It can also be an ITERM for output devices. You can drop this function
and use stream>header.bTerminalLink below (see uvc_stream_by_id() and
its usage in uvc_register_terms()).

> +	}
> +
> +	return -1;
> +}
> +
>  int uvc_register_video_device(struct uvc_device *dev,
>  			      struct uvc_streaming *stream,
>  			      struct video_device *vdev,
> @@ -2162,6 +2174,8 @@ int uvc_register_video_device(struct uvc_device *dev,
>  			      const struct v4l2_file_operations *fops,
>  			      const struct v4l2_ioctl_ops *ioctl_ops)
>  {
> +	char prefix[sizeof(vdev->name) - 9];
> +	const char *suffix;
>  	int ret;
>  
>  	/* Initialize the video buffers queue. */
> @@ -2190,16 +2204,21 @@ 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;
> +		suffix = "video";
>  		break;
>  	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
>  		vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
> +		suffix = "out";

I wonder if these two should be video-cap and video-out (or vid-cap and
vid-out if you want to shorten them) ?

>  		break;
>  	case V4L2_BUF_TYPE_META_CAPTURE:
>  		vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
> +		suffix = "meta";
>  		break;
>  	}
>  
> -	strscpy(vdev->name, dev->name, sizeof(vdev->name));
> +	strscpy(prefix, dev->name, sizeof(prefix));
> +	snprintf(vdev->name, sizeof(vdev->name), "%s-%d %s", prefix,

The unit ID is never negative, so %u ?

> +		 uvc_oterm_id(stream->chain), suffix);

Truncating the device name at the beginning of the video node name isn't
very nice :-S How about the following ?

	snprintf(vdev->name, sizeof(vdev->name), "%s-%u (%s)", type_name,
		 uvc_oterm_id(stream->chain), dev->name);

with the suffix variable renamed to type_name ?

Thinking some more about it, vdev->name serves two purposes in the
driver: creating the entity name, and reporting the card name in
querycap. The former is done in the V4L2 core, which uses vdev->name
as-is. In this context, we con't need to add dev->name, it would be
redundant as the media controller device already reports it. The latter
is done in uvc_ioctl_querycap(). How about dropping dev->name from
vdev->name, and modifying uvc_ioctl_querycap() to use dev->name instead
of cap->card ?

>  
>  	/*
>  	 * Set the driver data before calling video_register_device, otherwise

-- 
Regards,

Laurent Pinchart

Re: [PATCH v3 5/8] media: uvcvideo: refactor __uvc_ctrl_add_mapping

[Laurent Pinchart]

Hi Ricardo,

Thank you for the patch, and thank you for splitting it out of 6/8, it
makes review easier.

On Fri, Mar 12, 2021 at 01:48:27PM +0100, Ricardo Ribalda wrote:
> 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.
> 
> 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..90ecdc24d70a 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 ret;

ret will be initialized if dev->chains is empty. This shouldn't happen,
but static analyzers may complain. I'd return 0 instead.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> +}
> +
>  /*
>   * 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;

-- 
Regards,

Laurent Pinchart

Re: [PATCH v3 4/8] media: uvcvideo: set error_idx to count on EACCESS

[Laurent Pinchart]

Hi Ricardo,

Thank you for the patch.

On Fri, Mar 12, 2021 at 01:48:26PM +0100, 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):
>                 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>
> Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Still pending discussions in v2.

> ---
>  drivers/media/usb/uvc/uvc_v4l2.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index 157310c0ca87..36eb48622d48 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -1073,7 +1073,8 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
>  		ret = uvc_ctrl_get(chain, ctrl);
>  		if (ret < 0) {
>  			uvc_ctrl_rollback(handle);
> -			ctrls->error_idx = i;
> +			ctrls->error_idx = (ret == -EACCES) ?
> +						ctrls->count : i;
>  			return ret;
>  		}
>  	}

-- 
Regards,

Laurent Pinchart

Re: [PATCH v3 6/8] media: uvcvideo: Add support for V4L2_CTRL_TYPE_CTRL_CLASS

[Laurent Pinchart]

Hi Ricardo,

Thank you for the patch.

On Fri, Mar 12, 2021 at 01:48:28PM +0100, Ricardo Ribalda wrote:
> 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>

Still pending discussions on v2. Can't we disallow event subscription on
classes ? It makes no sense at all for userspace.

> ---
>  drivers/media/usb/uvc/uvc_ctrl.c | 96 ++++++++++++++++++++++++++++++++
>  drivers/media/usb/uvc/uvcvideo.h |  6 ++
>  2 files changed, 102 insertions(+)
> 
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index 90ecdc24d70a..5bb9e7696fe5 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -357,6 +357,17 @@ static const struct uvc_control_info uvc_ctrls[] = {
>  	},
>  };
>  
> +static const struct uvc_control_class uvc_control_class[] = {
> +	{
> +		.id		= V4L2_CID_CAMERA_CLASS,
> +		.name		= "Camera Controls",
> +	},
> +	{
> +		.id		= V4L2_CID_USER_CLASS,
> +		.name		= "User Controls",
> +	},
> +};
> +
>  static const struct uvc_menu_info power_line_frequency_controls[] = {
>  	{ 0, "Disabled" },
>  	{ 1, "50 Hz" },
> @@ -1024,6 +1035,49 @@ 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, uvc_control_class[idx].name,
> +		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 +1181,31 @@ 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 +1499,11 @@ 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 +1537,10 @@ 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 +1658,9 @@ 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 +1680,9 @@ 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 +2149,7 @@ 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 +2173,14 @@ 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..1f17e4253673 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -262,6 +262,11 @@ struct uvc_control_mapping {
>  		    u8 *data);
>  };
>  
> +struct uvc_control_class {
> +	u32 id;
> +	char name[32];
> +};
> +
>  struct uvc_control {
>  	struct uvc_entity *entity;
>  	struct uvc_control_info info;
> @@ -475,6 +480,7 @@ 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 {

-- 
Regards,

Laurent Pinchart

Re: [PATCH v3 7/8] media: uvcvideo: Set a different name for the metadata entity

[Ricardo Ribalda Delgado]

HI Laurent

Thanks for the review

On Fri, Mar 12, 2021 at 11:30 PM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> Hi Ricardo,
>
> Thank you for the patch.
>
> On Fri, Mar 12, 2021 at 01:48:29PM +0100, Ricardo Ribalda wrote:
> > All the entities must have a unique name. And now that we are at it, we
> > append the entity->id to the name to avoid collisions on 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>
> > ---
> >  drivers/media/usb/uvc/uvc_driver.c | 21 ++++++++++++++++++++-
> >  1 file changed, 20 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > index 35873cf2773d..6c928e708615 100644
> > --- a/drivers/media/usb/uvc/uvc_driver.c
> > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > @@ -2154,6 +2154,18 @@ static void uvc_unregister_video(struct uvc_device *dev)
> >  #endif
> >  }
> >
> > +static int uvc_oterm_id(struct uvc_video_chain *chain)
> > +{
> > +     struct uvc_entity *entity;
> > +
> > +     list_for_each_entry(entity, &chain->entities, chain) {
> > +             if (UVC_ENTITY_IS_OTERM(entity))
> > +                     return entity->id;
>
> It can also be an ITERM for output devices. You can drop this function
> and use stream>header.bTerminalLink below (see uvc_stream_by_id() and
> its usage in uvc_register_terms()).
>
> > +     }
> > +
> > +     return -1;
> > +}
> > +
> >  int uvc_register_video_device(struct uvc_device *dev,
> >                             struct uvc_streaming *stream,
> >                             struct video_device *vdev,
> > @@ -2162,6 +2174,8 @@ int uvc_register_video_device(struct uvc_device *dev,
> >                             const struct v4l2_file_operations *fops,
> >                             const struct v4l2_ioctl_ops *ioctl_ops)
> >  {
> > +     char prefix[sizeof(vdev->name) - 9];
> > +     const char *suffix;
> >       int ret;
> >
> >       /* Initialize the video buffers queue. */
> > @@ -2190,16 +2204,21 @@ 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;
> > +             suffix = "video";
> >               break;
> >       case V4L2_BUF_TYPE_VIDEO_OUTPUT:
> >               vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
> > +             suffix = "out";
>
> I wonder if these two should be video-cap and video-out (or vid-cap and
> vid-out if you want to shorten them) ?
>
> >               break;
> >       case V4L2_BUF_TYPE_META_CAPTURE:
> >               vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
> > +             suffix = "meta";
> >               break;
> >       }
> >
> > -     strscpy(vdev->name, dev->name, sizeof(vdev->name));
> > +     strscpy(prefix, dev->name, sizeof(prefix));
> > +     snprintf(vdev->name, sizeof(vdev->name), "%s-%d %s", prefix,
>
> The unit ID is never negative, so %u ?
>
> > +              uvc_oterm_id(stream->chain), suffix);
>
> Truncating the device name at the beginning of the video node name isn't
> very nice :-S How about the following ?
>
>         snprintf(vdev->name, sizeof(vdev->name), "%s-%u (%s)", type_name,
>                  uvc_oterm_id(stream->chain), dev->name);
>
> with the suffix variable renamed to type_name ?
>
> Thinking some more about it, vdev->name serves two purposes in the
> driver: creating the entity name, and reporting the card name in
> querycap. The former is done in the V4L2 core, which uses vdev->name
> as-is. In this context, we con't need to add dev->name, it would be
> redundant as the media controller device already reports it. The latter
> is done in uvc_ioctl_querycap(). How about dropping dev->name from
> vdev->name, and modifying uvc_ioctl_querycap() to use dev->name instead
> of cap->card ?
>

Something like ?
https://git.kernel.org/pub/scm/linux/kernel/git/ribalda/linux.git/commit/?h=uvc-compliance-v4&id=d4f7363455837116268152c96bf4b78d9761ad1e
https://git.kernel.org/pub/scm/linux/kernel/git/ribalda/linux.git/commit/?h=uvc-compliance-v4&id=ee3916f12b30f56c03d5622ba8a599b9c610a055

I need to work on the V4L2_CTRL_FLAG_GRABBED issue and then I will
send the whole v4 series that can pass all the v4l2-compliance test :)

Thanks!

> >
> >       /*
> >        * Set the driver data before calling video_register_device, otherwise
>
> --
> Regards,
>
> Laurent Pinchart



-- 
Ricardo Ribalda

Re: [PATCH v3 7/8] media: uvcvideo: Set a different name for the metadata entity

[Laurent Pinchart]

Hi Ricardo,

On Sat, Mar 13, 2021 at 12:17:50AM +0100, Ricardo Ribalda Delgado wrote:
> On Fri, Mar 12, 2021 at 11:30 PM Laurent Pinchart wrote:
> > On Fri, Mar 12, 2021 at 01:48:29PM +0100, Ricardo Ribalda wrote:
> > > All the entities must have a unique name. And now that we are at it, we
> > > append the entity->id to the name to avoid collisions on 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>
> > > ---
> > >  drivers/media/usb/uvc/uvc_driver.c | 21 ++++++++++++++++++++-
> > >  1 file changed, 20 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > > index 35873cf2773d..6c928e708615 100644
> > > --- a/drivers/media/usb/uvc/uvc_driver.c
> > > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > > @@ -2154,6 +2154,18 @@ static void uvc_unregister_video(struct uvc_device *dev)
> > >  #endif
> > >  }
> > >
> > > +static int uvc_oterm_id(struct uvc_video_chain *chain)
> > > +{
> > > +     struct uvc_entity *entity;
> > > +
> > > +     list_for_each_entry(entity, &chain->entities, chain) {
> > > +             if (UVC_ENTITY_IS_OTERM(entity))
> > > +                     return entity->id;
> >
> > It can also be an ITERM for output devices. You can drop this function
> > and use stream>header.bTerminalLink below (see uvc_stream_by_id() and
> > its usage in uvc_register_terms()).
> >
> > > +     }
> > > +
> > > +     return -1;
> > > +}
> > > +
> > >  int uvc_register_video_device(struct uvc_device *dev,
> > >                             struct uvc_streaming *stream,
> > >                             struct video_device *vdev,
> > > @@ -2162,6 +2174,8 @@ int uvc_register_video_device(struct uvc_device *dev,
> > >                             const struct v4l2_file_operations *fops,
> > >                             const struct v4l2_ioctl_ops *ioctl_ops)
> > >  {
> > > +     char prefix[sizeof(vdev->name) - 9];
> > > +     const char *suffix;
> > >       int ret;
> > >
> > >       /* Initialize the video buffers queue. */
> > > @@ -2190,16 +2204,21 @@ 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;
> > > +             suffix = "video";
> > >               break;
> > >       case V4L2_BUF_TYPE_VIDEO_OUTPUT:
> > >               vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
> > > +             suffix = "out";
> >
> > I wonder if these two should be video-cap and video-out (or vid-cap and
> > vid-out if you want to shorten them) ?
> >
> > >               break;
> > >       case V4L2_BUF_TYPE_META_CAPTURE:
> > >               vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
> > > +             suffix = "meta";
> > >               break;
> > >       }
> > >
> > > -     strscpy(vdev->name, dev->name, sizeof(vdev->name));
> > > +     strscpy(prefix, dev->name, sizeof(prefix));
> > > +     snprintf(vdev->name, sizeof(vdev->name), "%s-%d %s", prefix,
> >
> > The unit ID is never negative, so %u ?
> >
> > > +              uvc_oterm_id(stream->chain), suffix);
> >
> > Truncating the device name at the beginning of the video node name isn't
> > very nice :-S How about the following ?
> >
> >         snprintf(vdev->name, sizeof(vdev->name), "%s-%u (%s)", type_name,
> >                  uvc_oterm_id(stream->chain), dev->name);
> >
> > with the suffix variable renamed to type_name ?
> >
> > Thinking some more about it, vdev->name serves two purposes in the
> > driver: creating the entity name, and reporting the card name in
> > querycap. The former is done in the V4L2 core, which uses vdev->name
> > as-is. In this context, we con't need to add dev->name, it would be
> > redundant as the media controller device already reports it. The latter
> > is done in uvc_ioctl_querycap(). How about dropping dev->name from
> > vdev->name, and modifying uvc_ioctl_querycap() to use dev->name instead
> > of cap->card ?
> >
> 
> Something like ?
> https://git.kernel.org/pub/scm/linux/kernel/git/ribalda/linux.git/commit/?h=uvc-compliance-v4&id=d4f7363455837116268152c96bf4b78d9761ad1e

I would have moved the sprintf() after the switch/case, but otherwise
it's the idea.

> https://git.kernel.org/pub/scm/linux/kernel/git/ribalda/linux.git/commit/?h=uvc-compliance-v4&id=ee3916f12b30f56c03d5622ba8a599b9c610a055

Looks good.

> I need to work on the V4L2_CTRL_FLAG_GRABBED issue and then I will
> send the whole v4 series that can pass all the v4l2-compliance test :)
> 
> > >
> > >       /*
> > >        * Set the driver data before calling video_register_device, otherwise

-- 
Regards,

Laurent Pinchart

Re: [PATCH v3 7/8] media: uvcvideo: Set a different name for the metadata entity

[Ricardo Ribalda Delgado]

Hi Laurent

Thanks!
On Sat, Mar 13, 2021 at 12:29 AM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> Hi Ricardo,
>
> On Sat, Mar 13, 2021 at 12:17:50AM +0100, Ricardo Ribalda Delgado wrote:
> > On Fri, Mar 12, 2021 at 11:30 PM Laurent Pinchart wrote:
> > > On Fri, Mar 12, 2021 at 01:48:29PM +0100, Ricardo Ribalda wrote:
> > > > All the entities must have a unique name. And now that we are at it, we
> > > > append the entity->id to the name to avoid collisions on 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>
> > > > ---
> > > >  drivers/media/usb/uvc/uvc_driver.c | 21 ++++++++++++++++++++-
> > > >  1 file changed, 20 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > > > index 35873cf2773d..6c928e708615 100644
> > > > --- a/drivers/media/usb/uvc/uvc_driver.c
> > > > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > > > @@ -2154,6 +2154,18 @@ static void uvc_unregister_video(struct uvc_device *dev)
> > > >  #endif
> > > >  }
> > > >
> > > > +static int uvc_oterm_id(struct uvc_video_chain *chain)
> > > > +{
> > > > +     struct uvc_entity *entity;
> > > > +
> > > > +     list_for_each_entry(entity, &chain->entities, chain) {
> > > > +             if (UVC_ENTITY_IS_OTERM(entity))
> > > > +                     return entity->id;
> > >
> > > It can also be an ITERM for output devices. You can drop this function
> > > and use stream>header.bTerminalLink below (see uvc_stream_by_id() and
> > > its usage in uvc_register_terms()).
> > >
> > > > +     }
> > > > +
> > > > +     return -1;
> > > > +}
> > > > +
> > > >  int uvc_register_video_device(struct uvc_device *dev,
> > > >                             struct uvc_streaming *stream,
> > > >                             struct video_device *vdev,
> > > > @@ -2162,6 +2174,8 @@ int uvc_register_video_device(struct uvc_device *dev,
> > > >                             const struct v4l2_file_operations *fops,
> > > >                             const struct v4l2_ioctl_ops *ioctl_ops)
> > > >  {
> > > > +     char prefix[sizeof(vdev->name) - 9];
> > > > +     const char *suffix;
> > > >       int ret;
> > > >
> > > >       /* Initialize the video buffers queue. */
> > > > @@ -2190,16 +2204,21 @@ 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;
> > > > +             suffix = "video";
> > > >               break;
> > > >       case V4L2_BUF_TYPE_VIDEO_OUTPUT:
> > > >               vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
> > > > +             suffix = "out";
> > >
> > > I wonder if these two should be video-cap and video-out (or vid-cap and
> > > vid-out if you want to shorten them) ?
> > >
> > > >               break;
> > > >       case V4L2_BUF_TYPE_META_CAPTURE:
> > > >               vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
> > > > +             suffix = "meta";
> > > >               break;
> > > >       }
> > > >
> > > > -     strscpy(vdev->name, dev->name, sizeof(vdev->name));
> > > > +     strscpy(prefix, dev->name, sizeof(prefix));
> > > > +     snprintf(vdev->name, sizeof(vdev->name), "%s-%d %s", prefix,
> > >
> > > The unit ID is never negative, so %u ?
> > >
> > > > +              uvc_oterm_id(stream->chain), suffix);
> > >
> > > Truncating the device name at the beginning of the video node name isn't
> > > very nice :-S How about the following ?
> > >
> > >         snprintf(vdev->name, sizeof(vdev->name), "%s-%u (%s)", type_name,
> > >                  uvc_oterm_id(stream->chain), dev->name);
> > >
> > > with the suffix variable renamed to type_name ?
> > >
> > > Thinking some more about it, vdev->name serves two purposes in the
> > > driver: creating the entity name, and reporting the card name in
> > > querycap. The former is done in the V4L2 core, which uses vdev->name
> > > as-is. In this context, we con't need to add dev->name, it would be
> > > redundant as the media controller device already reports it. The latter
> > > is done in uvc_ioctl_querycap(). How about dropping dev->name from
> > > vdev->name, and modifying uvc_ioctl_querycap() to use dev->name instead
> > > of cap->card ?
> > >
> >
> > Something like ?
> > https://git.kernel.org/pub/scm/linux/kernel/git/ribalda/linux.git/commit/?h=uvc-compliance-v4&id=d4f7363455837116268152c96bf4b78d9761ad1e
>
> I would have moved the sprintf() after the switch/case, but otherwise
> it's the idea.

https://git.kernel.org/pub/scm/linux/kernel/git/ribalda/linux.git/commit/?h=uvc-compliance-v4&id=fe287f9d764457f5bcd48780b99e54df161f33f6

Yep, it looks better

>
> > https://git.kernel.org/pub/scm/linux/kernel/git/ribalda/linux.git/commit/?h=uvc-compliance-v4&id=ee3916f12b30f56c03d5622ba8a599b9c610a055
>
> Looks good.
>
> > I need to work on the V4L2_CTRL_FLAG_GRABBED issue and then I will
> > send the whole v4 series that can pass all the v4l2-compliance test :)
> >
> > > >
> > > >       /*
> > > >        * Set the driver data before calling video_register_device, otherwise
>
> --
> Regards,
>
> Laurent Pinchart



-- 
Ricardo Ribalda