Linux kernel mirror (for testing)
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linux
1/*
2 * uvc_gadget.h -- USB Video Class Gadget driver
3 *
4 * Copyright (C) 2009-2010
5 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13#ifndef _UVC_GADGET_H_
14#define _UVC_GADGET_H_
15
16#include <linux/ioctl.h>
17#include <linux/types.h>
18#include <linux/usb/ch9.h>
19
20#define UVC_EVENT_FIRST (V4L2_EVENT_PRIVATE_START + 0)
21#define UVC_EVENT_CONNECT (V4L2_EVENT_PRIVATE_START + 0)
22#define UVC_EVENT_DISCONNECT (V4L2_EVENT_PRIVATE_START + 1)
23#define UVC_EVENT_STREAMON (V4L2_EVENT_PRIVATE_START + 2)
24#define UVC_EVENT_STREAMOFF (V4L2_EVENT_PRIVATE_START + 3)
25#define UVC_EVENT_SETUP (V4L2_EVENT_PRIVATE_START + 4)
26#define UVC_EVENT_DATA (V4L2_EVENT_PRIVATE_START + 5)
27#define UVC_EVENT_LAST (V4L2_EVENT_PRIVATE_START + 5)
28
29struct uvc_request_data
30{
31 __s32 length;
32 __u8 data[60];
33};
34
35struct uvc_event
36{
37 union {
38 enum usb_device_speed speed;
39 struct usb_ctrlrequest req;
40 struct uvc_request_data data;
41 };
42};
43
44#define UVCIOC_SEND_RESPONSE _IOW('U', 1, struct uvc_request_data)
45
46#define UVC_INTF_CONTROL 0
47#define UVC_INTF_STREAMING 1
48
49/* ------------------------------------------------------------------------
50 * Debugging, printing and logging
51 */
52
53#ifdef __KERNEL__
54
55#include <linux/usb.h> /* For usb_endpoint_* */
56#include <linux/usb/composite.h>
57#include <linux/usb/gadget.h>
58#include <linux/videodev2.h>
59#include <linux/version.h>
60#include <media/v4l2-fh.h>
61#include <media/v4l2-device.h>
62
63#include "uvc_queue.h"
64
65#define UVC_TRACE_PROBE (1 << 0)
66#define UVC_TRACE_DESCR (1 << 1)
67#define UVC_TRACE_CONTROL (1 << 2)
68#define UVC_TRACE_FORMAT (1 << 3)
69#define UVC_TRACE_CAPTURE (1 << 4)
70#define UVC_TRACE_CALLS (1 << 5)
71#define UVC_TRACE_IOCTL (1 << 6)
72#define UVC_TRACE_FRAME (1 << 7)
73#define UVC_TRACE_SUSPEND (1 << 8)
74#define UVC_TRACE_STATUS (1 << 9)
75
76#define UVC_WARN_MINMAX 0
77#define UVC_WARN_PROBE_DEF 1
78
79extern unsigned int uvc_gadget_trace_param;
80
81#define uvc_trace(flag, msg...) \
82 do { \
83 if (uvc_gadget_trace_param & flag) \
84 printk(KERN_DEBUG "uvcvideo: " msg); \
85 } while (0)
86
87#define uvc_warn_once(dev, warn, msg...) \
88 do { \
89 if (!test_and_set_bit(warn, &dev->warnings)) \
90 printk(KERN_INFO "uvcvideo: " msg); \
91 } while (0)
92
93#define uvc_printk(level, msg...) \
94 printk(level "uvcvideo: " msg)
95
96/* ------------------------------------------------------------------------
97 * Driver specific constants
98 */
99
100#define UVC_NUM_REQUESTS 4
101#define UVC_MAX_REQUEST_SIZE 64
102#define UVC_MAX_EVENTS 4
103
104/* ------------------------------------------------------------------------
105 * Structures
106 */
107
108struct uvc_video
109{
110 struct usb_ep *ep;
111
112 /* Frame parameters */
113 u8 bpp;
114 u32 fcc;
115 unsigned int width;
116 unsigned int height;
117 unsigned int imagesize;
118 struct mutex mutex; /* protects frame parameters */
119
120 /* Requests */
121 unsigned int req_size;
122 struct usb_request *req[UVC_NUM_REQUESTS];
123 __u8 *req_buffer[UVC_NUM_REQUESTS];
124 struct list_head req_free;
125 spinlock_t req_lock;
126
127 void (*encode) (struct usb_request *req, struct uvc_video *video,
128 struct uvc_buffer *buf);
129
130 /* Context data used by the completion handler */
131 __u32 payload_size;
132 __u32 max_payload_size;
133
134 struct uvc_video_queue queue;
135 unsigned int fid;
136};
137
138enum uvc_state
139{
140 UVC_STATE_DISCONNECTED,
141 UVC_STATE_CONNECTED,
142 UVC_STATE_STREAMING,
143};
144
145struct uvc_device
146{
147 struct video_device vdev;
148 struct v4l2_device v4l2_dev;
149 enum uvc_state state;
150 struct usb_function func;
151 struct uvc_video video;
152
153 /* Descriptors */
154 struct {
155 const struct uvc_descriptor_header * const *fs_control;
156 const struct uvc_descriptor_header * const *ss_control;
157 const struct uvc_descriptor_header * const *fs_streaming;
158 const struct uvc_descriptor_header * const *hs_streaming;
159 const struct uvc_descriptor_header * const *ss_streaming;
160 } desc;
161
162 unsigned int control_intf;
163 struct usb_ep *control_ep;
164 struct usb_request *control_req;
165 void *control_buf;
166
167 unsigned int streaming_intf;
168
169 /* Events */
170 unsigned int event_length;
171 unsigned int event_setup_out : 1;
172};
173
174static inline struct uvc_device *to_uvc(struct usb_function *f)
175{
176 return container_of(f, struct uvc_device, func);
177}
178
179struct uvc_file_handle
180{
181 struct v4l2_fh vfh;
182 struct uvc_video *device;
183};
184
185#define to_uvc_file_handle(handle) \
186 container_of(handle, struct uvc_file_handle, vfh)
187
188/* ------------------------------------------------------------------------
189 * Functions
190 */
191
192extern void uvc_function_setup_continue(struct uvc_device *uvc);
193extern void uvc_endpoint_stream(struct uvc_device *dev);
194
195extern void uvc_function_connect(struct uvc_device *uvc);
196extern void uvc_function_disconnect(struct uvc_device *uvc);
197
198#endif /* __KERNEL__ */
199
200#endif /* _UVC_GADGET_H_ */
201