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-v4l2.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_v4l2_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 
45 	unsigned int flags;
46 	__u32 sequence;
47 
48 	unsigned int buf_used;
49 
50 	spinlock_t irqlock;	/* Protects flags and irqqueue */
51 	struct list_head irqqueue;
52 };
53 
54 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
55 {
56 	return vb2_is_streaming(&queue->queue);
57 }
58 
59 int uvcg_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
60 		    struct mutex *lock);
61 
62 void uvcg_free_buffers(struct uvc_video_queue *queue);
63 
64 int uvcg_alloc_buffers(struct uvc_video_queue *queue,
65 		       struct v4l2_requestbuffers *rb);
66 
67 int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
68 
69 int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
70 
71 int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
72 			struct v4l2_buffer *buf, int nonblocking);
73 
74 unsigned int uvcg_queue_poll(struct uvc_video_queue *queue,
75 			     struct file *file, poll_table *wait);
76 
77 int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
78 
79 #ifndef CONFIG_MMU
80 unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
81 					   unsigned long pgoff);
82 #endif /* CONFIG_MMU */
83 
84 void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
85 
86 int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
87 
88 struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue,
89 					  struct uvc_buffer *buf);
90 
91 struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
92 
93 #endif /* __KERNEL__ */
94 
95 #endif /* _UVC_QUEUE_H_ */
96 
97