1 #ifndef _UVC_QUEUE_H_
2 #define _UVC_QUEUE_H_
3 
4 #ifdef __KERNEL__
5 
6 #include <linux/kernel.h>
7 #include <linux/poll.h>
8 #include <linux/videodev2.h>
9 #include <media/videobuf2-core.h>
10 
11 /* Maximum frame size in bytes, for sanity checking. */
12 #define UVC_MAX_FRAME_SIZE	(16*1024*1024)
13 /* Maximum number of video buffers. */
14 #define UVC_MAX_VIDEO_BUFFERS	32
15 
16 /* ------------------------------------------------------------------------
17  * Structures.
18  */
19 
20 enum uvc_buffer_state {
21 	UVC_BUF_STATE_IDLE	= 0,
22 	UVC_BUF_STATE_QUEUED	= 1,
23 	UVC_BUF_STATE_ACTIVE	= 2,
24 	UVC_BUF_STATE_DONE	= 3,
25 	UVC_BUF_STATE_ERROR	= 4,
26 };
27 
28 struct uvc_buffer {
29 	struct vb2_buffer buf;
30 	struct list_head queue;
31 
32 	enum uvc_buffer_state state;
33 	void *mem;
34 	unsigned int length;
35 	unsigned int bytesused;
36 };
37 
38 #define UVC_QUEUE_DISCONNECTED		(1 << 0)
39 #define UVC_QUEUE_DROP_INCOMPLETE	(1 << 1)
40 #define UVC_QUEUE_PAUSED		(1 << 2)
41 
42 struct uvc_video_queue {
43 	struct vb2_queue queue;
44 	struct mutex mutex;	/* Protects queue */
45 
46 	unsigned int flags;
47 	__u32 sequence;
48 
49 	unsigned int buf_used;
50 
51 	spinlock_t irqlock;	/* Protects flags and irqqueue */
52 	struct list_head irqqueue;
53 };
54 
55 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
56 {
57 	return vb2_is_streaming(&queue->queue);
58 }
59 
60 #endif /* __KERNEL__ */
61 
62 #endif /* _UVC_QUEUE_H_ */
63 
64