1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/list.h>
6 #include <linux/poll.h>
7 #include <linux/spinlock.h>
9 #include <media/videobuf2-v4l2.h>
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
19 /* ------------------------------------------------------------------------
23 enum 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,
32 struct vb2_v4l2_buffer buf;
33 struct list_head queue;
35 enum uvc_buffer_state state;
38 unsigned int bytesused;
41 #define UVC_QUEUE_DISCONNECTED (1 << 0)
42 #define UVC_QUEUE_DROP_INCOMPLETE (1 << 1)
43 #define UVC_QUEUE_PAUSED (1 << 2)
45 struct uvc_video_queue {
46 struct vb2_queue queue;
51 unsigned int buf_used;
53 spinlock_t irqlock; /* Protects flags and irqqueue */
54 struct list_head irqqueue;
57 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
59 return vb2_is_streaming(&queue->queue);
62 int uvcg_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
65 void uvcg_free_buffers(struct uvc_video_queue *queue);
67 int uvcg_alloc_buffers(struct uvc_video_queue *queue,
68 struct v4l2_requestbuffers *rb);
70 int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
72 int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
74 int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
75 struct v4l2_buffer *buf, int nonblocking);
77 __poll_t uvcg_queue_poll(struct uvc_video_queue *queue,
78 struct file *file, poll_table *wait);
80 int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
83 unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
85 #endif /* CONFIG_MMU */
87 void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
89 int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
91 struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue,
92 struct uvc_buffer *buf);
94 struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
96 #endif /* _UVC_QUEUE_H_ */