Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / usb / gadget / function / uvc.h
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
29 struct uvc_request_data
30 {
31         __s32 length;
32         __u8 data[60];
33 };
34
35 struct 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
79 extern 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
108 struct 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
138 enum uvc_state
139 {
140         UVC_STATE_DISCONNECTED,
141         UVC_STATE_CONNECTED,
142         UVC_STATE_STREAMING,
143 };
144
145 struct 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
174 static inline struct uvc_device *to_uvc(struct usb_function *f)
175 {
176         return container_of(f, struct uvc_device, func);
177 }
178
179 struct 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
192 extern void uvc_function_setup_continue(struct uvc_device *uvc);
193 extern void uvc_endpoint_stream(struct uvc_device *dev);
194
195 extern void uvc_function_connect(struct uvc_device *uvc);
196 extern void uvc_function_disconnect(struct uvc_device *uvc);
197
198 #endif /* __KERNEL__ */
199
200 #endif /* _UVC_GADGET_H_ */
201