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Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / drivers / usb / gadget / function / uvc_queue.h
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         /* req_payload_size: only used with isoc */
43         unsigned int req_payload_size;
44 };
45
46 #define UVC_QUEUE_DISCONNECTED          (1 << 0)
47 #define UVC_QUEUE_DROP_INCOMPLETE       (1 << 1)
48
49 struct uvc_video_queue {
50         struct vb2_queue queue;
51
52         unsigned int flags;
53         __u32 sequence;
54
55         unsigned int buf_used;
56
57         bool use_sg;
58
59         spinlock_t irqlock;     /* Protects flags and irqqueue */
60         struct list_head irqqueue;
61 };
62
63 static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
64 {
65         return vb2_is_streaming(&queue->queue);
66 }
67
68 int uvcg_queue_init(struct uvc_video_queue *queue, struct device *dev, enum v4l2_buf_type type,
69                     struct mutex *lock);
70
71 void uvcg_free_buffers(struct uvc_video_queue *queue);
72
73 int uvcg_alloc_buffers(struct uvc_video_queue *queue,
74                        struct v4l2_requestbuffers *rb);
75
76 int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
77
78 int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
79
80 int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
81                         struct v4l2_buffer *buf, int nonblocking);
82
83 __poll_t uvcg_queue_poll(struct uvc_video_queue *queue,
84                              struct file *file, poll_table *wait);
85
86 int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
87
88 #ifndef CONFIG_MMU
89 unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
90                                            unsigned long pgoff);
91 #endif /* CONFIG_MMU */
92
93 void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
94
95 int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
96
97 void uvcg_complete_buffer(struct uvc_video_queue *queue,
98                                           struct uvc_buffer *buf);
99
100 struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
101
102 #endif /* _UVC_QUEUE_H_ */
103
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