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 19enum 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 27struct 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 43struct 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 61static 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