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[karo-tx-linux.git] / drivers / usb / gadget / function / uvc_queue.h
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