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
11 struct file;
12 struct 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
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,
29 };
30
31 struct 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 #define UVC_QUEUE_PAUSED (1 << 2)
47
48 struct uvc_video_queue {
49 struct vb2_queue queue;
50
51 unsigned int flags;
52 __u32 sequence;
53
54 unsigned int buf_used;
55
56 bool use_sg;
57
58 spinlock_t irqlock; /* Protects flags and irqqueue */
59 struct list_head irqqueue;
60 };
61
uvc_queue_streaming(struct uvc_video_queue * queue)62 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
63 {
64 return vb2_is_streaming(&queue->queue);
65 }
66
67 int uvcg_queue_init(struct uvc_video_queue *queue, struct device *dev, enum v4l2_buf_type type,
68 struct mutex *lock);
69
70 void uvcg_free_buffers(struct uvc_video_queue *queue);
71
72 int uvcg_alloc_buffers(struct uvc_video_queue *queue,
73 struct v4l2_requestbuffers *rb);
74
75 int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
76
77 int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
78
79 int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
80 struct v4l2_buffer *buf, int nonblocking);
81
82 __poll_t uvcg_queue_poll(struct uvc_video_queue *queue,
83 struct file *file, poll_table *wait);
84
85 int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
86
87 #ifndef CONFIG_MMU
88 unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
89 unsigned long pgoff);
90 #endif /* CONFIG_MMU */
91
92 void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
93
94 int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
95
96 struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue,
97 struct uvc_buffer *buf);
98
99 struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
100
101 #endif /* _UVC_QUEUE_H_ */
102
103
