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>

1 files changed, 31 insertions, 28 deletions

diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h
index 3cd9041e22a1..e7958aa454ce 100644
--- a/drivers/media/video/uvc/uvcvideo.h
+++ b/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 */