1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _UVC_QUEUE_H_
 3#define _UVC_QUEUE_H_
 4
 5#ifdef __KERNEL__
 6
 7#include <linux/kernel.h>
 8#include <linux/poll.h>
 9#include <linux/videodev2.h>
10#include <media/videobuf2-v4l2.h>
11
12/* Maximum frame size in bytes, for sanity checking. */
13#define UVC_MAX_FRAME_SIZE	(16*1024*1024)
14/* Maximum number of video buffers. */
15#define UVC_MAX_VIDEO_BUFFERS	32
16
17/* ------------------------------------------------------------------------
18 * Structures.
19 */
20
21enum uvc_buffer_state {
22	UVC_BUF_STATE_IDLE	= 0,
23	UVC_BUF_STATE_QUEUED	= 1,
24	UVC_BUF_STATE_ACTIVE	= 2,
25	UVC_BUF_STATE_DONE	= 3,
26	UVC_BUF_STATE_ERROR	= 4,
27};
28
29struct uvc_buffer {
30	struct vb2_v4l2_buffer buf;
31	struct list_head queue;
32
33	enum uvc_buffer_state state;
34	void *mem;
35	unsigned int length;
36	unsigned int bytesused;
37};
38
39#define UVC_QUEUE_DISCONNECTED		(1 << 0)
40#define UVC_QUEUE_DROP_INCOMPLETE	(1 << 1)
41#define UVC_QUEUE_PAUSED		(1 << 2)
42
43struct uvc_video_queue {
44	struct vb2_queue 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
55static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
56{
57	return vb2_is_streaming(&queue->queue);
58}
59
60int uvcg_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
61		    struct mutex *lock);
62
63void uvcg_free_buffers(struct uvc_video_queue *queue);
64
65int uvcg_alloc_buffers(struct uvc_video_queue *queue,
66		       struct v4l2_requestbuffers *rb);
67
68int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
69
70int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
71
72int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
73			struct v4l2_buffer *buf, int nonblocking);
74
75__poll_t uvcg_queue_poll(struct uvc_video_queue *queue,
76			     struct file *file, poll_table *wait);
77
78int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
79
80#ifndef CONFIG_MMU
81unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
82					   unsigned long pgoff);
83#endif /* CONFIG_MMU */
84
85void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
86
87int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
88
89struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue,
90					  struct uvc_buffer *buf);
91
92struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
93
94#endif /* __KERNEL__ */
95
96#endif /* _UVC_QUEUE_H_ */
97