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-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
  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_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