blob: 1812a8ecc5d0d567cbb48c39c69c0b21ca5efb80 [file] [log] [blame]
Laurent Pinchartcdda4792010-05-02 20:57:41 +02001#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
19enum 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
27struct 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
43struct 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
Laurent Pinchartcdda4792010-05-02 20:57:41 +020061static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
62{
63 return queue->flags & UVC_QUEUE_STREAMING;
64}
Laurent Pinchartcdda4792010-05-02 20:57:41 +020065
66#endif /* __KERNEL__ */
67
68#endif /* _UVC_QUEUE_H_ */
69