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
20enum 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
28struct 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
42struct 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
55static 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