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 
10 /* Maximum frame size in bytes, for sanity checking. */
11 #define UVC_MAX_FRAME_SIZE	(16*1024*1024)
12 /* Maximum number of video buffers. */
13 #define UVC_MAX_VIDEO_BUFFERS	32
14 
15 /* ------------------------------------------------------------------------
16  * Structures.
17  */
18 
19 enum uvc_buffer_state {
20 	UVC_BUF_STATE_IDLE	= 0,
21 	UVC_BUF_STATE_QUEUED	= 1,
22 	UVC_BUF_STATE_ACTIVE	= 2,
23 	UVC_BUF_STATE_DONE	= 3,
24 	UVC_BUF_STATE_ERROR	= 4,
25 };
26 
27 struct uvc_buffer {
28 	unsigned long vma_use_count;
29 	struct list_head stream;
30 
31 	/* Touched by interrupt handler. */
32 	struct v4l2_buffer buf;
33 	struct list_head queue;
34 	wait_queue_head_t wait;
35 	enum uvc_buffer_state state;
36 };
37 
38 #define UVC_QUEUE_STREAMING		(1 << 0)
39 #define UVC_QUEUE_DISCONNECTED		(1 << 1)
40 #define UVC_QUEUE_DROP_INCOMPLETE	(1 << 2)
41 #define UVC_QUEUE_PAUSED		(1 << 3)
42 
43 struct uvc_video_queue {
44 	enum v4l2_buf_type type;
45 
46 	void *mem;
47 	unsigned int flags;
48 	__u32 sequence;
49 
50 	unsigned int count;
51 	unsigned int buf_size;
52 	unsigned int buf_used;
53 	struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
54 	struct mutex mutex;	/* protects buffers and mainqueue */
55 	spinlock_t irqlock;	/* protects irqqueue */
56 
57 	struct list_head mainqueue;
58 	struct list_head irqqueue;
59 };
60 
uvc_queue_streaming(struct uvc_video_queue * queue)61 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
62 {
63 	return queue->flags & UVC_QUEUE_STREAMING;
64 }
65 
66 #endif /* __KERNEL__ */
67 
68 #endif /* _UVC_QUEUE_H_ */
69 
70