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 __s32 length;
31 __u8 data[60];
32};
33
34struct uvc_event {
35 union {
36 enum usb_device_speed speed;
37 struct usb_ctrlrequest req;
38 struct uvc_request_data data;
39 };
40};
41
42#define UVCIOC_SEND_RESPONSE _IOW('U', 1, struct uvc_request_data)
43
44#define UVC_INTF_CONTROL 0
45#define UVC_INTF_STREAMING 1
46
47/* ------------------------------------------------------------------------
48 * Debugging, printing and logging
49 */
50
51#ifdef __KERNEL__
52
53#include <linux/usb.h> /* For usb_endpoint_* */
54#include <linux/usb/composite.h>
55#include <linux/usb/gadget.h>
56#include <linux/videodev2.h>
57#include <media/v4l2-fh.h>
58#include <media/v4l2-device.h>
59
60#include "uvc_queue.h"
61
62#define UVC_TRACE_PROBE (1 << 0)
63#define UVC_TRACE_DESCR (1 << 1)
64#define UVC_TRACE_CONTROL (1 << 2)
65#define UVC_TRACE_FORMAT (1 << 3)
66#define UVC_TRACE_CAPTURE (1 << 4)
67#define UVC_TRACE_CALLS (1 << 5)
68#define UVC_TRACE_IOCTL (1 << 6)
69#define UVC_TRACE_FRAME (1 << 7)
70#define UVC_TRACE_SUSPEND (1 << 8)
71#define UVC_TRACE_STATUS (1 << 9)
72
73#define UVC_WARN_MINMAX 0
74#define UVC_WARN_PROBE_DEF 1
75
76extern unsigned int uvc_gadget_trace_param;
77
78#define uvc_trace(flag, msg...) \
79 do { \
80 if (uvc_gadget_trace_param & flag) \
81 printk(KERN_DEBUG "uvcvideo: " msg); \
82 } while (0)
83
84#define uvc_warn_once(dev, warn, msg...) \
85 do { \
86 if (!test_and_set_bit(warn, &dev->warnings)) \
87 printk(KERN_INFO "uvcvideo: " msg); \
88 } while (0)
89
90#define uvc_printk(level, msg...) \
91 printk(level "uvcvideo: " msg)
92
93/* ------------------------------------------------------------------------
94 * Driver specific constants
95 */
96
97#define UVC_NUM_REQUESTS 4
98#define UVC_MAX_REQUEST_SIZE 64
99#define UVC_MAX_EVENTS 4
100
101/* ------------------------------------------------------------------------
102 * Structures
103 */
104
105struct uvc_video {
106 struct usb_ep *ep;
107
108 /* Frame parameters */
109 u8 bpp;
110 u32 fcc;
111 unsigned int width;
112 unsigned int height;
113 unsigned int imagesize;
114 struct mutex mutex; /* protects frame parameters */
115
116 /* Requests */
117 unsigned int req_size;
118 struct usb_request *req[UVC_NUM_REQUESTS];
119 __u8 *req_buffer[UVC_NUM_REQUESTS];
120 struct list_head req_free;
121 spinlock_t req_lock;
122
123 void (*encode) (struct usb_request *req, struct uvc_video *video,
124 struct uvc_buffer *buf);
125
126 /* Context data used by the completion handler */
127 __u32 payload_size;
128 __u32 max_payload_size;
129
130 struct uvc_video_queue queue;
131 unsigned int fid;
132};
133
134enum uvc_state {
135 UVC_STATE_DISCONNECTED,
136 UVC_STATE_CONNECTED,
137 UVC_STATE_STREAMING,
138};
139
140struct uvc_device {
141 struct video_device vdev;
142 struct v4l2_device v4l2_dev;
143 enum uvc_state state;
144 struct usb_function func;
145 struct uvc_video video;
146
147 /* Descriptors */
148 struct {
149 const struct uvc_descriptor_header * const *fs_control;
150 const struct uvc_descriptor_header * const *ss_control;
151 const struct uvc_descriptor_header * const *fs_streaming;
152 const struct uvc_descriptor_header * const *hs_streaming;
153 const struct uvc_descriptor_header * const *ss_streaming;
154 } desc;
155
156 unsigned int control_intf;
157 struct usb_ep *control_ep;
158 struct usb_request *control_req;
159 void *control_buf;
160
161 unsigned int streaming_intf;
162
163 /* Events */
164 unsigned int event_length;
165 unsigned int event_setup_out : 1;
166};
167
168static inline struct uvc_device *to_uvc(struct usb_function *f)
169{
170 return container_of(f, struct uvc_device, func);
171}
172
173struct uvc_file_handle {
174 struct v4l2_fh vfh;
175 struct uvc_video *device;
176};
177
178#define to_uvc_file_handle(handle) \
179 container_of(handle, struct uvc_file_handle, vfh)
180
181/* ------------------------------------------------------------------------
182 * Functions
183 */
184
185extern void uvc_function_setup_continue(struct uvc_device *uvc);
186extern void uvc_endpoint_stream(struct uvc_device *dev);
187
188extern void uvc_function_connect(struct uvc_device *uvc);
189extern void uvc_function_disconnect(struct uvc_device *uvc);
190
191#endif /* __KERNEL__ */
192
193#endif /* _UVC_GADGET_H_ */
194