uvc_queue.h (2500B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _UVC_QUEUE_H_ 3#define _UVC_QUEUE_H_ 4 5#include <linux/list.h> 6#include <linux/poll.h> 7#include <linux/spinlock.h> 8 9#include <media/videobuf2-v4l2.h> 10 11struct file; 12struct mutex; 13 14/* Maximum frame size in bytes, for sanity checking. */ 15#define UVC_MAX_FRAME_SIZE (16*1024*1024) 16/* Maximum number of video buffers. */ 17#define UVC_MAX_VIDEO_BUFFERS 32 18 19/* ------------------------------------------------------------------------ 20 * Structures. 21 */ 22 23enum uvc_buffer_state { 24 UVC_BUF_STATE_IDLE = 0, 25 UVC_BUF_STATE_QUEUED = 1, 26 UVC_BUF_STATE_ACTIVE = 2, 27 UVC_BUF_STATE_DONE = 3, 28 UVC_BUF_STATE_ERROR = 4, 29}; 30 31struct uvc_buffer { 32 struct vb2_v4l2_buffer buf; 33 struct list_head queue; 34 35 enum uvc_buffer_state state; 36 void *mem; 37 struct sg_table *sgt; 38 struct scatterlist *sg; 39 unsigned int offset; 40 unsigned int length; 41 unsigned int bytesused; 42}; 43 44#define UVC_QUEUE_DISCONNECTED (1 << 0) 45#define UVC_QUEUE_DROP_INCOMPLETE (1 << 1) 46 47struct uvc_video_queue { 48 struct vb2_queue queue; 49 50 unsigned int flags; 51 __u32 sequence; 52 53 unsigned int buf_used; 54 55 bool use_sg; 56 57 spinlock_t irqlock; /* Protects flags and irqqueue */ 58 struct list_head irqqueue; 59}; 60 61static inline int uvc_queue_streaming(struct uvc_video_queue *queue) 62{ 63 return vb2_is_streaming(&queue->queue); 64} 65 66int uvcg_queue_init(struct uvc_video_queue *queue, struct device *dev, enum v4l2_buf_type type, 67 struct mutex *lock); 68 69void uvcg_free_buffers(struct uvc_video_queue *queue); 70 71int uvcg_alloc_buffers(struct uvc_video_queue *queue, 72 struct v4l2_requestbuffers *rb); 73 74int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf); 75 76int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf); 77 78int uvcg_dequeue_buffer(struct uvc_video_queue *queue, 79 struct v4l2_buffer *buf, int nonblocking); 80 81__poll_t uvcg_queue_poll(struct uvc_video_queue *queue, 82 struct file *file, poll_table *wait); 83 84int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma); 85 86#ifndef CONFIG_MMU 87unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue, 88 unsigned long pgoff); 89#endif /* CONFIG_MMU */ 90 91void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect); 92 93int uvcg_queue_enable(struct uvc_video_queue *queue, int enable); 94 95void uvcg_complete_buffer(struct uvc_video_queue *queue, 96 struct uvc_buffer *buf); 97 98struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue); 99 100#endif /* _UVC_QUEUE_H_ */ 101