USB: add SPDX identifiers to all remaining files in drivers/usb/
[linux-2.6-block.git] / drivers / usb / gadget / function / uvc.h
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  *      This program is free software; you can redistribute it and/or modify
9  *      it under the terms of the GNU General Public License as published by
10  *      the Free Software Foundation; either version 2 of the License, or
11  *      (at your option) any later version.
12  */
13
14 #ifndef _UVC_GADGET_H_
15 #define _UVC_GADGET_H_
16
17 #include <linux/ioctl.h>
18 #include <linux/types.h>
19 #include <linux/usb/ch9.h>
20
21 #define UVC_EVENT_FIRST                 (V4L2_EVENT_PRIVATE_START + 0)
22 #define UVC_EVENT_CONNECT               (V4L2_EVENT_PRIVATE_START + 0)
23 #define UVC_EVENT_DISCONNECT            (V4L2_EVENT_PRIVATE_START + 1)
24 #define UVC_EVENT_STREAMON              (V4L2_EVENT_PRIVATE_START + 2)
25 #define UVC_EVENT_STREAMOFF             (V4L2_EVENT_PRIVATE_START + 3)
26 #define UVC_EVENT_SETUP                 (V4L2_EVENT_PRIVATE_START + 4)
27 #define UVC_EVENT_DATA                  (V4L2_EVENT_PRIVATE_START + 5)
28 #define UVC_EVENT_LAST                  (V4L2_EVENT_PRIVATE_START + 5)
29
30 struct uvc_request_data {
31         __s32 length;
32         __u8 data[60];
33 };
34
35 struct uvc_event {
36         union {
37                 enum usb_device_speed speed;
38                 struct usb_ctrlrequest req;
39                 struct uvc_request_data data;
40         };
41 };
42
43 #define UVCIOC_SEND_RESPONSE            _IOW('U', 1, struct uvc_request_data)
44
45 #define UVC_INTF_CONTROL                0
46 #define UVC_INTF_STREAMING              1
47
48 /* ------------------------------------------------------------------------
49  * Debugging, printing and logging
50  */
51
52 #ifdef __KERNEL__
53
54 #include <linux/usb.h>  /* For usb_endpoint_* */
55 #include <linux/usb/composite.h>
56 #include <linux/usb/gadget.h>
57 #include <linux/videodev2.h>
58 #include <media/v4l2-fh.h>
59 #include <media/v4l2-device.h>
60
61 #include "uvc_queue.h"
62
63 #define UVC_TRACE_PROBE                         (1 << 0)
64 #define UVC_TRACE_DESCR                         (1 << 1)
65 #define UVC_TRACE_CONTROL                       (1 << 2)
66 #define UVC_TRACE_FORMAT                        (1 << 3)
67 #define UVC_TRACE_CAPTURE                       (1 << 4)
68 #define UVC_TRACE_CALLS                         (1 << 5)
69 #define UVC_TRACE_IOCTL                         (1 << 6)
70 #define UVC_TRACE_FRAME                         (1 << 7)
71 #define UVC_TRACE_SUSPEND                       (1 << 8)
72 #define UVC_TRACE_STATUS                        (1 << 9)
73
74 #define UVC_WARN_MINMAX                         0
75 #define UVC_WARN_PROBE_DEF                      1
76
77 extern unsigned int uvc_gadget_trace_param;
78
79 #define uvc_trace(flag, msg...) \
80         do { \
81                 if (uvc_gadget_trace_param & flag) \
82                         printk(KERN_DEBUG "uvcvideo: " msg); \
83         } while (0)
84
85 #define uvc_warn_once(dev, warn, msg...) \
86         do { \
87                 if (!test_and_set_bit(warn, &dev->warnings)) \
88                         printk(KERN_INFO "uvcvideo: " msg); \
89         } while (0)
90
91 #define uvc_printk(level, msg...) \
92         printk(level "uvcvideo: " msg)
93
94 /* ------------------------------------------------------------------------
95  * Driver specific constants
96  */
97
98 #define UVC_NUM_REQUESTS                        4
99 #define UVC_MAX_REQUEST_SIZE                    64
100 #define UVC_MAX_EVENTS                          4
101
102 /* ------------------------------------------------------------------------
103  * Structures
104  */
105
106 struct uvc_video {
107         struct usb_ep *ep;
108
109         /* Frame parameters */
110         u8 bpp;
111         u32 fcc;
112         unsigned int width;
113         unsigned int height;
114         unsigned int imagesize;
115         struct mutex mutex;     /* protects frame parameters */
116
117         /* Requests */
118         unsigned int req_size;
119         struct usb_request *req[UVC_NUM_REQUESTS];
120         __u8 *req_buffer[UVC_NUM_REQUESTS];
121         struct list_head req_free;
122         spinlock_t req_lock;
123
124         void (*encode) (struct usb_request *req, struct uvc_video *video,
125                         struct uvc_buffer *buf);
126
127         /* Context data used by the completion handler */
128         __u32 payload_size;
129         __u32 max_payload_size;
130
131         struct uvc_video_queue queue;
132         unsigned int fid;
133 };
134
135 enum uvc_state {
136         UVC_STATE_DISCONNECTED,
137         UVC_STATE_CONNECTED,
138         UVC_STATE_STREAMING,
139 };
140
141 struct uvc_device {
142         struct video_device vdev;
143         struct v4l2_device v4l2_dev;
144         enum uvc_state state;
145         struct usb_function func;
146         struct uvc_video video;
147
148         /* Descriptors */
149         struct {
150                 const struct uvc_descriptor_header * const *fs_control;
151                 const struct uvc_descriptor_header * const *ss_control;
152                 const struct uvc_descriptor_header * const *fs_streaming;
153                 const struct uvc_descriptor_header * const *hs_streaming;
154                 const struct uvc_descriptor_header * const *ss_streaming;
155         } desc;
156
157         unsigned int control_intf;
158         struct usb_ep *control_ep;
159         struct usb_request *control_req;
160         void *control_buf;
161
162         unsigned int streaming_intf;
163
164         /* Events */
165         unsigned int event_length;
166         unsigned int event_setup_out : 1;
167 };
168
169 static inline struct uvc_device *to_uvc(struct usb_function *f)
170 {
171         return container_of(f, struct uvc_device, func);
172 }
173
174 struct uvc_file_handle {
175         struct v4l2_fh vfh;
176         struct uvc_video *device;
177 };
178
179 #define to_uvc_file_handle(handle) \
180         container_of(handle, struct uvc_file_handle, vfh)
181
182 /* ------------------------------------------------------------------------
183  * Functions
184  */
185
186 extern void uvc_function_setup_continue(struct uvc_device *uvc);
187 extern void uvc_endpoint_stream(struct uvc_device *dev);
188
189 extern void uvc_function_connect(struct uvc_device *uvc);
190 extern void uvc_function_disconnect(struct uvc_device *uvc);
191
192 #endif /* __KERNEL__ */
193
194 #endif /* _UVC_GADGET_H_ */
195