1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _UVC_QUEUE_H_
3*4882a593Smuzhiyun #define _UVC_QUEUE_H_
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/list.h>
6*4882a593Smuzhiyun #include <linux/poll.h>
7*4882a593Smuzhiyun #include <linux/spinlock.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <media/videobuf2-v4l2.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun struct file;
12*4882a593Smuzhiyun struct mutex;
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun /* Maximum frame size in bytes, for sanity checking. */
15*4882a593Smuzhiyun #define UVC_MAX_FRAME_SIZE (16*1024*1024)
16*4882a593Smuzhiyun /* Maximum number of video buffers. */
17*4882a593Smuzhiyun #define UVC_MAX_VIDEO_BUFFERS 32
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun /* ------------------------------------------------------------------------
20*4882a593Smuzhiyun * Structures.
21*4882a593Smuzhiyun */
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun enum uvc_buffer_state {
24*4882a593Smuzhiyun UVC_BUF_STATE_IDLE = 0,
25*4882a593Smuzhiyun UVC_BUF_STATE_QUEUED = 1,
26*4882a593Smuzhiyun UVC_BUF_STATE_ACTIVE = 2,
27*4882a593Smuzhiyun UVC_BUF_STATE_DONE = 3,
28*4882a593Smuzhiyun UVC_BUF_STATE_ERROR = 4,
29*4882a593Smuzhiyun };
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun struct uvc_buffer {
32*4882a593Smuzhiyun struct vb2_v4l2_buffer buf;
33*4882a593Smuzhiyun struct list_head queue;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun enum uvc_buffer_state state;
36*4882a593Smuzhiyun void *mem;
37*4882a593Smuzhiyun unsigned int length;
38*4882a593Smuzhiyun unsigned int bytesused;
39*4882a593Smuzhiyun };
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun #define UVC_QUEUE_DISCONNECTED (1 << 0)
42*4882a593Smuzhiyun #define UVC_QUEUE_DROP_INCOMPLETE (1 << 1)
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun struct uvc_video_queue {
45*4882a593Smuzhiyun struct vb2_queue queue;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun unsigned int flags;
48*4882a593Smuzhiyun __u32 sequence;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun unsigned int buf_used;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun spinlock_t irqlock; /* Protects flags and irqqueue */
53*4882a593Smuzhiyun struct list_head irqqueue;
54*4882a593Smuzhiyun };
55*4882a593Smuzhiyun
uvc_queue_streaming(struct uvc_video_queue * queue)56*4882a593Smuzhiyun static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun return vb2_is_streaming(&queue->queue);
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun int uvcg_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,
62*4882a593Smuzhiyun struct mutex *lock);
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun void uvcg_free_buffers(struct uvc_video_queue *queue);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun int uvcg_alloc_buffers(struct uvc_video_queue *queue,
67*4882a593Smuzhiyun struct v4l2_requestbuffers *rb);
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
74*4882a593Smuzhiyun struct v4l2_buffer *buf, int nonblocking);
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun __poll_t uvcg_queue_poll(struct uvc_video_queue *queue,
77*4882a593Smuzhiyun struct file *file, poll_table *wait);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun #ifndef CONFIG_MMU
82*4882a593Smuzhiyun unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
83*4882a593Smuzhiyun unsigned long pgoff);
84*4882a593Smuzhiyun #endif /* CONFIG_MMU */
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue,
91*4882a593Smuzhiyun struct uvc_buffer *buf);
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun #endif /* _UVC_QUEUE_H_ */
96*4882a593Smuzhiyun
97