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 #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         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
  55 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
  56 {
  57         return vb2_is_streaming(&queue->queue);
  58 }
  59
  60 #endif /* __KERNEL__ */
  61
  62 #endif /* _UVC_QUEUE_H_ */
  63