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
60int uvcg_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type);
61
62void uvcg_free_buffers(struct uvc_video_queue *queue);
63
64int uvcg_alloc_buffers(struct uvc_video_queue *queue,
65		       struct v4l2_requestbuffers *rb);
66
67int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
68
69int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
70
71int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
72			struct v4l2_buffer *buf, int nonblocking);
73
74unsigned int uvcg_queue_poll(struct uvc_video_queue *queue,
75			     struct file *file, poll_table *wait);
76
77int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
78
79#ifndef CONFIG_MMU
80unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
81					   unsigned long pgoff);
82#endif /* CONFIG_MMU */
83
84void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
85
86int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
87
88struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue,
89					  struct uvc_buffer *buf);
90
91struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
92
93#endif /* __KERNEL__ */
94
95#endif /* _UVC_QUEUE_H_ */
96
97