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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * uvc_gadget.h -- USB Video Class Gadget driver
4 *
5 * Copyright (C) 2009-2010
6 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 */
8
9#ifndef _UVC_GADGET_H_
10#define _UVC_GADGET_H_
11
12#include <linux/list.h>
13#include <linux/mutex.h>
14#include <linux/spinlock.h>
15#include <linux/usb/composite.h>
16#include <linux/videodev2.h>
17
18#include <media/v4l2-device.h>
19#include <media/v4l2-dev.h>
20#include <media/v4l2-fh.h>
21
22#include "uvc_queue.h"
23
24struct usb_ep;
25struct usb_request;
26struct uvc_descriptor_header;
27
28/* ------------------------------------------------------------------------
29 * Debugging, printing and logging
30 */
31
32#define UVC_TRACE_PROBE (1 << 0)
33#define UVC_TRACE_DESCR (1 << 1)
34#define UVC_TRACE_CONTROL (1 << 2)
35#define UVC_TRACE_FORMAT (1 << 3)
36#define UVC_TRACE_CAPTURE (1 << 4)
37#define UVC_TRACE_CALLS (1 << 5)
38#define UVC_TRACE_IOCTL (1 << 6)
39#define UVC_TRACE_FRAME (1 << 7)
40#define UVC_TRACE_SUSPEND (1 << 8)
41#define UVC_TRACE_STATUS (1 << 9)
42
43#define UVC_WARN_MINMAX 0
44#define UVC_WARN_PROBE_DEF 1
45
46extern unsigned int uvc_gadget_trace_param;
47
48#define uvc_trace(flag, msg...) \
49 do { \
50 if (uvc_gadget_trace_param & flag) \
51 printk(KERN_DEBUG "uvcvideo: " msg); \
52 } while (0)
53
54#define uvc_warn_once(dev, warn, msg...) \
55 do { \
56 if (!test_and_set_bit(warn, &dev->warnings)) \
57 printk(KERN_INFO "uvcvideo: " msg); \
58 } while (0)
59
60#define uvc_printk(level, msg...) \
61 printk(level "uvcvideo: " msg)
62
63/* ------------------------------------------------------------------------
64 * Driver specific constants
65 */
66
67#define UVC_NUM_REQUESTS 4
68#define UVC_MAX_REQUEST_SIZE 64
69#define UVC_MAX_EVENTS 4
70
71/* ------------------------------------------------------------------------
72 * Structures
73 */
74
75struct uvc_video {
76 struct usb_ep *ep;
77
78 /* Frame parameters */
79 u8 bpp;
80 u32 fcc;
81 unsigned int width;
82 unsigned int height;
83 unsigned int imagesize;
84 struct mutex mutex; /* protects frame parameters */
85
86 /* Requests */
87 unsigned int req_size;
88 struct usb_request *req[UVC_NUM_REQUESTS];
89 __u8 *req_buffer[UVC_NUM_REQUESTS];
90 struct list_head req_free;
91 spinlock_t req_lock;
92
93 void (*encode) (struct usb_request *req, struct uvc_video *video,
94 struct uvc_buffer *buf);
95
96 /* Context data used by the completion handler */
97 __u32 payload_size;
98 __u32 max_payload_size;
99
100 struct uvc_video_queue queue;
101 unsigned int fid;
102};
103
104enum uvc_state {
105 UVC_STATE_DISCONNECTED,
106 UVC_STATE_CONNECTED,
107 UVC_STATE_STREAMING,
108};
109
110struct uvc_device {
111 struct video_device vdev;
112 struct v4l2_device v4l2_dev;
113 enum uvc_state state;
114 struct usb_function func;
115 struct uvc_video video;
116
117 /* Descriptors */
118 struct {
119 const struct uvc_descriptor_header * const *fs_control;
120 const struct uvc_descriptor_header * const *ss_control;
121 const struct uvc_descriptor_header * const *fs_streaming;
122 const struct uvc_descriptor_header * const *hs_streaming;
123 const struct uvc_descriptor_header * const *ss_streaming;
124 } desc;
125
126 unsigned int control_intf;
127 struct usb_ep *control_ep;
128 struct usb_request *control_req;
129 void *control_buf;
130
131 unsigned int streaming_intf;
132
133 /* Events */
134 unsigned int event_length;
135 unsigned int event_setup_out : 1;
136};
137
138static inline struct uvc_device *to_uvc(struct usb_function *f)
139{
140 return container_of(f, struct uvc_device, func);
141}
142
143struct uvc_file_handle {
144 struct v4l2_fh vfh;
145 struct uvc_video *device;
146};
147
148#define to_uvc_file_handle(handle) \
149 container_of(handle, struct uvc_file_handle, vfh)
150
151/* ------------------------------------------------------------------------
152 * Functions
153 */
154
155extern void uvc_function_setup_continue(struct uvc_device *uvc);
156extern void uvc_endpoint_stream(struct uvc_device *dev);
157
158extern void uvc_function_connect(struct uvc_device *uvc);
159extern void uvc_function_disconnect(struct uvc_device *uvc);
160
161#endif /* _UVC_GADGET_H_ */