drivers/usb/gadget/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
  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
  19 enum 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
  27 struct 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
  43 struct 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
  61 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
  62 {
  63         return queue->flags & UVC_QUEUE_STREAMING;
  64 }
  65
  66 #endif /* __KERNEL__ */
  67
  68 #endif /* _UVC_QUEUE_H_ */
  69