V4L/DVB (12379): uvcvideo: Multiple streaming interfaces support

Restructure the UVC descriptors parsing code to handle multiple streaming
interfaces. The driver now creates a uvc_video_chain instance for each chain
detected in the UVC control interface descriptors, and tries to register one
video device per streaming endpoint.
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/uvc/uvc_ctrl.c

@@ -729,7 +729,7 @@ static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id,
 	}
 }
 
-struct uvc_control *uvc_find_control(struct uvc_video_device *video,
+struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
 	__u32 v4l2_id, struct uvc_control_mapping **mapping)
 {
 	struct uvc_control *ctrl = NULL;
@@ -742,17 +742,17 @@ struct uvc_control *uvc_find_control(struct uvc_video_device *video,
 	v4l2_id &= V4L2_CTRL_ID_MASK;
 
 	/* Find the control. */
-	__uvc_find_control(video->processing, v4l2_id, mapping, &ctrl, next);
+	__uvc_find_control(chain->processing, v4l2_id, mapping, &ctrl, next);
 	if (ctrl && !next)
 		return ctrl;
 
-	list_for_each_entry(entity, &video->iterms, chain) {
+	list_for_each_entry(entity, &chain->iterms, chain) {
 		__uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
 		if (ctrl && !next)
 			return ctrl;
 	}
 
-	list_for_each_entry(entity, &video->extensions, chain) {
+	list_for_each_entry(entity, &chain->extensions, chain) {
 		__uvc_find_control(entity, v4l2_id, mapping, &ctrl, next);
 		if (ctrl && !next)
 			return ctrl;
@@ -765,7 +765,7 @@ struct uvc_control *uvc_find_control(struct uvc_video_device *video,
 	return ctrl;
 }
 
-int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
+int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 	struct v4l2_queryctrl *v4l2_ctrl)
 {
 	struct uvc_control *ctrl;
@@ -775,7 +775,7 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
 	__u8 *data;
 	int ret;
 
-	ctrl = uvc_find_control(video, v4l2_ctrl->id, &mapping);
+	ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping);
 	if (ctrl == NULL)
 		return -EINVAL;
 
@@ -793,9 +793,9 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
 		v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
 
 	if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
-		ret = uvc_query_ctrl(video->dev, UVC_GET_DEF, ctrl->entity->id,
-				video->dev->intfnum, ctrl->info->selector, data,
-				ctrl->info->size);
+		ret = uvc_query_ctrl(chain->dev, UVC_GET_DEF, ctrl->entity->id,
+				     chain->dev->intfnum, ctrl->info->selector,
+				     data, ctrl->info->size);
 		if (ret < 0)
 			goto out;
 		v4l2_ctrl->default_value =
@@ -831,25 +831,25 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
 	}
 
 	if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {
-		ret = uvc_query_ctrl(video->dev, UVC_GET_MIN, ctrl->entity->id,
-				video->dev->intfnum, ctrl->info->selector, data,
-				ctrl->info->size);
+		ret = uvc_query_ctrl(chain->dev, UVC_GET_MIN, ctrl->entity->id,
+				     chain->dev->intfnum, ctrl->info->selector,
+				     data, ctrl->info->size);
 		if (ret < 0)
 			goto out;
 		v4l2_ctrl->minimum = mapping->get(mapping, UVC_GET_MIN, data);
 	}
 	if (ctrl->info->flags & UVC_CONTROL_GET_MAX) {
-		ret = uvc_query_ctrl(video->dev, UVC_GET_MAX, ctrl->entity->id,
-				video->dev->intfnum, ctrl->info->selector, data,
-				ctrl->info->size);
+		ret = uvc_query_ctrl(chain->dev, UVC_GET_MAX, ctrl->entity->id,
+				     chain->dev->intfnum, ctrl->info->selector,
+				     data, ctrl->info->size);
 		if (ret < 0)
 			goto out;
 		v4l2_ctrl->maximum = mapping->get(mapping, UVC_GET_MAX, data);
 	}
 	if (ctrl->info->flags & UVC_CONTROL_GET_RES) {
-		ret = uvc_query_ctrl(video->dev, UVC_GET_RES, ctrl->entity->id,
-				video->dev->intfnum, ctrl->info->selector, data,
-				ctrl->info->size);
+		ret = uvc_query_ctrl(chain->dev, UVC_GET_RES, ctrl->entity->id,
+				     chain->dev->intfnum, ctrl->info->selector,
+				     data, ctrl->info->size);
 		if (ret < 0)
 			goto out;
 		v4l2_ctrl->step = mapping->get(mapping, UVC_GET_RES, data);
@@ -886,9 +886,9 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
  * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the
  * control lock.
  */
-int uvc_ctrl_begin(struct uvc_video_device *video)
+int uvc_ctrl_begin(struct uvc_video_chain *chain)
 {
-	return mutex_lock_interruptible(&video->ctrl_mutex) ? -ERESTARTSYS : 0;
+	return mutex_lock_interruptible(&chain->ctrl_mutex) ? -ERESTARTSYS : 0;
 }
 
 static int uvc_ctrl_commit_entity(struct uvc_device *dev,
@@ -938,34 +938,34 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 	return 0;
 }
 
-int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback)
+int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback)
 {
 	struct uvc_entity *entity;
 	int ret = 0;
 
 	/* Find the control. */
-	ret = uvc_ctrl_commit_entity(video->dev, video->processing, rollback);
+	ret = uvc_ctrl_commit_entity(chain->dev, chain->processing, rollback);
 	if (ret < 0)
 		goto done;
 
-	list_for_each_entry(entity, &video->iterms, chain) {
-		ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
+	list_for_each_entry(entity, &chain->iterms, chain) {
+		ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback);
 		if (ret < 0)
 			goto done;
 	}
 
-	list_for_each_entry(entity, &video->extensions, chain) {
-		ret = uvc_ctrl_commit_entity(video->dev, entity, rollback);
+	list_for_each_entry(entity, &chain->extensions, chain) {
+		ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback);
 		if (ret < 0)
 			goto done;
 	}
 
 done:
-	mutex_unlock(&video->ctrl_mutex);
+	mutex_unlock(&chain->ctrl_mutex);
 	return ret;
 }
 
-int uvc_ctrl_get(struct uvc_video_device *video,
+int uvc_ctrl_get(struct uvc_video_chain *chain,
 	struct v4l2_ext_control *xctrl)
 {
 	struct uvc_control *ctrl;
@@ -974,13 +974,13 @@ int uvc_ctrl_get(struct uvc_video_device *video,
 	unsigned int i;
 	int ret;
 
-	ctrl = uvc_find_control(video, xctrl->id, &mapping);
+	ctrl = uvc_find_control(chain, xctrl->id, &mapping);
 	if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0)
 		return -EINVAL;
 
 	if (!ctrl->loaded) {
-		ret = uvc_query_ctrl(video->dev, UVC_GET_CUR, ctrl->entity->id,
-				video->dev->intfnum, ctrl->info->selector,
+		ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, ctrl->entity->id,
+				chain->dev->intfnum, ctrl->info->selector,
 				uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 				ctrl->info->size);
 		if (ret < 0)
@@ -1005,7 +1005,7 @@ int uvc_ctrl_get(struct uvc_video_device *video,
 	return 0;
 }
 
-int uvc_ctrl_set(struct uvc_video_device *video,
+int uvc_ctrl_set(struct uvc_video_chain *chain,
 	struct v4l2_ext_control *xctrl)
 {
 	struct uvc_control *ctrl;
@@ -1013,7 +1013,7 @@ int uvc_ctrl_set(struct uvc_video_device *video,
 	s32 value = xctrl->value;
 	int ret;
 
-	ctrl = uvc_find_control(video, xctrl->id, &mapping);
+	ctrl = uvc_find_control(chain, xctrl->id, &mapping);
 	if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_SET_CUR) == 0)
 		return -EINVAL;
 
@@ -1028,8 +1028,8 @@ int uvc_ctrl_set(struct uvc_video_device *video,
 			memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 				0, ctrl->info->size);
 		} else {
-			ret = uvc_query_ctrl(video->dev, UVC_GET_CUR,
-				ctrl->entity->id, video->dev->intfnum,
+			ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
+				ctrl->entity->id, chain->dev->intfnum,
 				ctrl->info->selector,
 				uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT),
 				ctrl->info->size);
@@ -1058,7 +1058,7 @@ int uvc_ctrl_set(struct uvc_video_device *video,
  * Dynamic controls
  */
 
-int uvc_xu_ctrl_query(struct uvc_video_device *video,
+int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
 	struct uvc_xu_control *xctrl, int set)
 {
 	struct uvc_entity *entity;
@@ -1068,7 +1068,7 @@ int uvc_xu_ctrl_query(struct uvc_video_device *video,
 	int ret;
 
 	/* Find the extension unit. */
-	list_for_each_entry(entity, &video->extensions, chain) {
+	list_for_each_entry(entity, &chain->extensions, chain) {
 		if (entity->id == xctrl->unit)
 			break;
 	}
@@ -1107,7 +1107,7 @@ int uvc_xu_ctrl_query(struct uvc_video_device *video,
 	    (!set && !(ctrl->info->flags & UVC_CONTROL_GET_CUR)))
 		return -EINVAL;
 
-	if (mutex_lock_interruptible(&video->ctrl_mutex))
+	if (mutex_lock_interruptible(&chain->ctrl_mutex))
 		return -ERESTARTSYS;
 
 	memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
@@ -1120,8 +1120,8 @@ int uvc_xu_ctrl_query(struct uvc_video_device *video,
 		goto out;
 	}
 
-	ret = uvc_query_ctrl(video->dev, set ? UVC_SET_CUR : UVC_GET_CUR,
-			     xctrl->unit, video->dev->intfnum, xctrl->selector,
+	ret = uvc_query_ctrl(chain->dev, set ? UVC_SET_CUR : UVC_GET_CUR,
+			     xctrl->unit, chain->dev->intfnum, xctrl->selector,
 			     data, xctrl->size);
 	if (ret < 0)
 		goto out;
@@ -1137,7 +1137,7 @@ int uvc_xu_ctrl_query(struct uvc_video_device *video,
 		       uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP),
 		       xctrl->size);
 
-	mutex_unlock(&video->ctrl_mutex);
+	mutex_unlock(&chain->ctrl_mutex);
 	return ret;
 }
 

drivers/media/video/uvc/uvc_v4l2.c

@@ -40,7 +40,7 @@
  * table for the controls that can be mapped directly, and handle the others
  * manually.
  */
-static int uvc_v4l2_query_menu(struct uvc_video_device *video,
+static int uvc_v4l2_query_menu(struct uvc_video_chain *chain,
 	struct v4l2_querymenu *query_menu)
 {
 	struct uvc_menu_info *menu_info;
@@ -49,7 +49,7 @@ static int uvc_v4l2_query_menu(struct uvc_video_device *video,
 	u32 index = query_menu->index;
 	u32 id = query_menu->id;
 
-	ctrl = uvc_find_control(video, query_menu->id, &mapping);
+	ctrl = uvc_find_control(chain, query_menu->id, &mapping);
 	if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU)
 		return -EINVAL;
 
@@ -451,7 +451,7 @@ static int uvc_v4l2_open(struct file *file)
 		}
 	}
 
-	handle->video = &stream->dev->video;
+	handle->chain = stream->chain;
 	handle->stream = stream;
 	handle->state = UVC_HANDLE_PASSIVE;
 	file->private_data = handle;
@@ -498,7 +498,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 {
 	struct video_device *vdev = video_devdata(file);
 	struct uvc_fh *handle = (struct uvc_fh *)file->private_data;
-	struct uvc_video_device *video = handle->video;
+	struct uvc_video_chain *chain = handle->chain;
 	struct uvc_streaming *stream = handle->stream;
 	long ret = 0;
 
@@ -525,7 +525,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 
 	/* Get, Set & Query control */
 	case VIDIOC_QUERYCTRL:
-		return uvc_query_v4l2_ctrl(video, arg);
+		return uvc_query_v4l2_ctrl(chain, arg);
 
 	case VIDIOC_G_CTRL:
 	{
@@ -535,12 +535,12 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 		memset(&xctrl, 0, sizeof xctrl);
 		xctrl.id = ctrl->id;
 
-	       ret = uvc_ctrl_begin(video);
-	       if (ret < 0)
+		ret = uvc_ctrl_begin(chain);
+		if (ret < 0)
 			return ret;
 
-		ret = uvc_ctrl_get(video, &xctrl);
-		uvc_ctrl_rollback(video);
+		ret = uvc_ctrl_get(chain, &xctrl);
+		uvc_ctrl_rollback(chain);
 		if (ret >= 0)
 			ctrl->value = xctrl.value;
 		break;
@@ -555,21 +555,21 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 		xctrl.id = ctrl->id;
 		xctrl.value = ctrl->value;
 
-	       ret = uvc_ctrl_begin(video);
-	       if (ret < 0)
+		uvc_ctrl_begin(chain);
+		if (ret < 0)
 			return ret;
 
-		ret = uvc_ctrl_set(video, &xctrl);
+		ret = uvc_ctrl_set(chain, &xctrl);
 		if (ret < 0) {
-			uvc_ctrl_rollback(video);
+			uvc_ctrl_rollback(chain);
 			return ret;
 		}
-		ret = uvc_ctrl_commit(video);
+		ret = uvc_ctrl_commit(chain);
 		break;
 	}
 
 	case VIDIOC_QUERYMENU:
-		return uvc_v4l2_query_menu(video, arg);
+		return uvc_v4l2_query_menu(chain, arg);
 
 	case VIDIOC_G_EXT_CTRLS:
 	{
@@ -577,20 +577,20 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 		struct v4l2_ext_control *ctrl = ctrls->controls;
 		unsigned int i;
 
-	       ret = uvc_ctrl_begin(video);
-	       if (ret < 0)
+		ret = uvc_ctrl_begin(chain);
+		if (ret < 0)
 			return ret;
 
 		for (i = 0; i < ctrls->count; ++ctrl, ++i) {
-			ret = uvc_ctrl_get(video, ctrl);
+			ret = uvc_ctrl_get(chain, ctrl);
 			if (ret < 0) {
-				uvc_ctrl_rollback(video);
+				uvc_ctrl_rollback(chain);
 				ctrls->error_idx = i;
 				return ret;
 			}
 		}
 		ctrls->error_idx = 0;
-		ret = uvc_ctrl_rollback(video);
+		ret = uvc_ctrl_rollback(chain);
 		break;
 	}
 
@@ -601,14 +601,14 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 		struct v4l2_ext_control *ctrl = ctrls->controls;
 		unsigned int i;
 
-		ret = uvc_ctrl_begin(video);
+		ret = uvc_ctrl_begin(chain);
 		if (ret < 0)
 			return ret;
 
 		for (i = 0; i < ctrls->count; ++ctrl, ++i) {
-			ret = uvc_ctrl_set(video, ctrl);
+			ret = uvc_ctrl_set(chain, ctrl);
 			if (ret < 0) {
-				uvc_ctrl_rollback(video);
+				uvc_ctrl_rollback(chain);
 				ctrls->error_idx = i;
 				return ret;
 			}
@@ -617,31 +617,31 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 		ctrls->error_idx = 0;
 
 		if (cmd == VIDIOC_S_EXT_CTRLS)
-			ret = uvc_ctrl_commit(video);
+			ret = uvc_ctrl_commit(chain);
 		else
-			ret = uvc_ctrl_rollback(video);
+			ret = uvc_ctrl_rollback(chain);
 		break;
 	}
 
 	/* Get, Set & Enum input */
 	case VIDIOC_ENUMINPUT:
 	{
-		const struct uvc_entity *selector = video->selector;
+		const struct uvc_entity *selector = chain->selector;
 		struct v4l2_input *input = arg;
 		struct uvc_entity *iterm = NULL;
 		u32 index = input->index;
 		int pin = 0;
 
 		if (selector == NULL ||
-		    (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
+		    (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 			if (index != 0)
 				return -EINVAL;
-			iterm = list_first_entry(&video->iterms,
+			iterm = list_first_entry(&chain->iterms,
 					struct uvc_entity, chain);
 			pin = iterm->id;
 		} else if (pin < selector->selector.bNrInPins) {
 			pin = selector->selector.baSourceID[index];
-			list_for_each_entry(iterm, video->iterms.next, chain) {
+			list_for_each_entry(iterm, chain->iterms.next, chain) {
 				if (iterm->id == pin)
 					break;
 			}
@@ -662,14 +662,14 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 	{
 		u8 input;
 
-		if (video->selector == NULL ||
-		    (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
+		if (chain->selector == NULL ||
+		    (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 			*(int *)arg = 0;
 			break;
 		}
 
-		ret = uvc_query_ctrl(video->dev, UVC_GET_CUR,
-			video->selector->id, video->dev->intfnum,
+		ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR,
+			chain->selector->id, chain->dev->intfnum,
 			UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 		if (ret < 0)
 			return ret;
@@ -685,18 +685,18 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 		if ((ret = uvc_acquire_privileges(handle)) < 0)
 			return ret;
 
-		if (video->selector == NULL ||
-		    (video->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
+		if (chain->selector == NULL ||
+		    (chain->dev->quirks & UVC_QUIRK_IGNORE_SELECTOR_UNIT)) {
 			if (input != 1)
 				return -EINVAL;
 			break;
 		}
 
-		if (input == 0 || input > video->selector->selector.bNrInPins)
+		if (input == 0 || input > chain->selector->selector.bNrInPins)
 			return -EINVAL;
 
-		return uvc_query_ctrl(video->dev, UVC_SET_CUR,
-			video->selector->id, video->dev->intfnum,
+		return uvc_query_ctrl(chain->dev, UVC_SET_CUR,
+			chain->selector->id, chain->dev->intfnum,
 			UVC_SU_INPUT_SELECT_CONTROL, &input, 1);
 	}
 
@@ -1019,10 +1019,10 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 	}
 
 	case UVCIOC_CTRL_GET:
-		return uvc_xu_ctrl_query(video, arg, 0);
+		return uvc_xu_ctrl_query(chain, arg, 0);
 
 	case UVCIOC_CTRL_SET:
-		return uvc_xu_ctrl_query(video, arg, 1);
+		return uvc_xu_ctrl_query(chain, arg, 1);
 
 	default:
 		if ((ret = v4l_compat_translate_ioctl(file, cmd, arg,

drivers/media/video/uvc/uvc_video.c

@@ -128,7 +128,7 @@ static int uvc_get_video_ctrl(struct uvc_streaming *stream,
 	if (data == NULL)
 		return -ENOMEM;
 
-	if ((video->dev->quirks & UVC_QUIRK_PROBE_DEF) && query == UVC_GET_DEF)
+	if ((stream->dev->quirks & UVC_QUIRK_PROBE_DEF) && query == UVC_GET_DEF)
 		return -EIO;
 
 	ret = __uvc_query_ctrl(stream->dev, query, 0, stream->intfnum,

drivers/media/video/uvc/uvcvideo.h

@@ -80,9 +80,11 @@ struct uvc_xu_control {
 #define UVC_ENTITY_IS_UNIT(entity)	(((entity)->type & 0xff00) == 0)
 #define UVC_ENTITY_IS_TERM(entity)	(((entity)->type & 0xff00) != 0)
 #define UVC_ENTITY_IS_ITERM(entity) \
-	(((entity)->type & 0x8000) == UVC_TERM_INPUT)
+	(UVC_ENTITY_IS_TERM(entity) && \
+	((entity)->type & 0x8000) == UVC_TERM_INPUT)
 #define UVC_ENTITY_IS_OTERM(entity) \
-	(((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
+	(UVC_ENTITY_IS_TERM(entity) && \
+	((entity)->type & 0x8000) == UVC_TERM_OUTPUT)
 
 
 /* ------------------------------------------------------------------------
@@ -402,10 +404,24 @@ struct uvc_video_queue {
 	struct list_head irqqueue;
 };
 
+struct uvc_video_chain {
+	struct uvc_device *dev;
+	struct list_head list;
+
+	struct list_head iterms;		/* Input terminals */
+	struct list_head oterms;		/* Output terminals */
+	struct uvc_entity *processing;		/* Processing unit */
+	struct uvc_entity *selector;		/* Selector unit */
+	struct list_head extensions;		/* Extension units */
+
+	struct mutex ctrl_mutex;
+};
+
 struct uvc_streaming {
 	struct list_head list;
 	struct uvc_device *dev;
 	struct video_device *vdev;
+	struct uvc_video_chain *chain;
 	atomic_t active;
 
 	struct usb_interface *intf;
@@ -446,18 +462,6 @@ struct uvc_streaming {
 	__u8 last_fid;
 };
 
-struct uvc_video_device {
-	struct uvc_device *dev;
-
-	struct list_head iterms;		/* Input terminals */
-	struct uvc_entity *oterm;		/* Output terminal */
-	struct uvc_entity *sterm;		/* USB streaming terminal */
-	struct uvc_entity *processing;
-	struct uvc_entity *selector;
-	struct list_head extensions;
-	struct mutex ctrl_mutex;
-};
-
 enum uvc_device_state {
 	UVC_DEV_DISCONNECTED = 1,
 };
@@ -480,8 +484,7 @@ struct uvc_device {
 	__u32 clock_frequency;
 
 	struct list_head entities;
-
-	struct uvc_video_device video;
+	struct list_head chains;
 
 	/* Video Streaming interfaces */
 	struct list_head streams;
@@ -500,7 +503,7 @@ enum uvc_handle_state {
 };
 
 struct uvc_fh {
-	struct uvc_video_device *video;
+	struct uvc_video_chain *chain;
 	struct uvc_streaming *stream;
 	enum uvc_handle_state state;
 };
@@ -618,9 +621,9 @@ extern int uvc_status_suspend(struct uvc_device *dev);
 extern int uvc_status_resume(struct uvc_device *dev);
 
 /* Controls */
-extern struct uvc_control *uvc_find_control(struct uvc_video_device *video,
+extern struct uvc_control *uvc_find_control(struct uvc_video_chain *chain,
 		__u32 v4l2_id, struct uvc_control_mapping **mapping);
-extern int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
+extern int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 		struct v4l2_queryctrl *v4l2_ctrl);
 
 extern int uvc_ctrl_add_info(struct uvc_control_info *info);
@@ -630,23 +633,23 @@ extern void uvc_ctrl_cleanup_device(struct uvc_device *dev);
 extern int uvc_ctrl_resume_device(struct uvc_device *dev);
 extern void uvc_ctrl_init(void);
 
-extern int uvc_ctrl_begin(struct uvc_video_device *video);
-extern int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback);
-static inline int uvc_ctrl_commit(struct uvc_video_device *video)
+extern int uvc_ctrl_begin(struct uvc_video_chain *chain);
+extern int __uvc_ctrl_commit(struct uvc_video_chain *chain, int rollback);
+static inline int uvc_ctrl_commit(struct uvc_video_chain *chain)
 {
-	return __uvc_ctrl_commit(video, 0);
+	return __uvc_ctrl_commit(chain, 0);
 }
-static inline int uvc_ctrl_rollback(struct uvc_video_device *video)
+static inline int uvc_ctrl_rollback(struct uvc_video_chain *chain)
 {
-	return __uvc_ctrl_commit(video, 1);
+	return __uvc_ctrl_commit(chain, 1);
 }
 
-extern int uvc_ctrl_get(struct uvc_video_device *video,
+extern int uvc_ctrl_get(struct uvc_video_chain *chain,
 		struct v4l2_ext_control *xctrl);
-extern int uvc_ctrl_set(struct uvc_video_device *video,
+extern int uvc_ctrl_set(struct uvc_video_chain *chain,
 		struct v4l2_ext_control *xctrl);
 
-extern int uvc_xu_ctrl_query(struct uvc_video_device *video,
+extern int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
 		struct uvc_xu_control *ctrl, int set);
 
 /* Utility functions */