1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
|
// SPDX-License-Identifier: GPL-2.0+
/*
* webcam.c -- USB webcam gadget driver
*
* Copyright (C) 2009-2010
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*/
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/usb/video.h>
#include "u_uvc.h"
USB_GADGET_COMPOSITE_OPTIONS();
/*-------------------------------------------------------------------------*/
/* module parameters specific to the Video streaming endpoint */
static unsigned int streaming_interval = 1;
module_param(streaming_interval, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(streaming_interval, "1 - 16");
static unsigned int streaming_maxpacket = 1024;
module_param(streaming_maxpacket, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(streaming_maxpacket, "1 - 1023 (FS), 1 - 3072 (hs/ss)");
static unsigned int streaming_maxburst;
module_param(streaming_maxburst, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(streaming_maxburst, "0 - 15 (ss only)");
static unsigned int trace;
module_param(trace, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(trace, "Trace level bitmask");
/* --------------------------------------------------------------------------
* Device descriptor
*/
#define WEBCAM_VENDOR_ID 0x1d6b /* Linux Foundation */
#define WEBCAM_PRODUCT_ID 0x0102 /* Webcam A/V gadget */
#define WEBCAM_DEVICE_BCD 0x0010 /* 0.10 */
static char webcam_vendor_label[] = "Linux Foundation";
static char webcam_product_label[] = "Webcam gadget";
static char webcam_config_label[] = "Video";
/* string IDs are assigned dynamically */
#define STRING_DESCRIPTION_IDX USB_GADGET_FIRST_AVAIL_IDX
static struct usb_string webcam_strings[] = {
[USB_GADGET_MANUFACTURER_IDX].s = webcam_vendor_label,
[USB_GADGET_PRODUCT_IDX].s = webcam_product_label,
[USB_GADGET_SERIAL_IDX].s = "",
[STRING_DESCRIPTION_IDX].s = webcam_config_label,
{ }
};
static struct usb_gadget_strings webcam_stringtab = {
.language = 0x0409, /* en-us */
.strings = webcam_strings,
};
static struct usb_gadget_strings *webcam_device_strings[] = {
&webcam_stringtab,
NULL,
};
static struct usb_function_instance *fi_uvc;
static struct usb_function *f_uvc;
static struct usb_device_descriptor webcam_device_descriptor = {
.bLength = USB_DT_DEVICE_SIZE,
.bDescriptorType = USB_DT_DEVICE,
/* .bcdUSB = DYNAMIC */
.bDeviceClass = USB_CLASS_MISC,
.bDeviceSubClass = 0x02,
.bDeviceProtocol = 0x01,
.bMaxPacketSize0 = 0, /* dynamic */
.idVendor = cpu_to_le16(WEBCAM_VENDOR_ID),
.idProduct = cpu_to_le16(WEBCAM_PRODUCT_ID),
.bcdDevice = cpu_to_le16(WEBCAM_DEVICE_BCD),
.iManufacturer = 0, /* dynamic */
.iProduct = 0, /* dynamic */
.iSerialNumber = 0, /* dynamic */
.bNumConfigurations = 0, /* dynamic */
};
DECLARE_UVC_HEADER_DESCRIPTOR(1);
static const struct UVC_HEADER_DESCRIPTOR(1) uvc_control_header = {
.bLength = UVC_DT_HEADER_SIZE(1),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VC_HEADER,
.bcdUVC = cpu_to_le16(0x0100),
.wTotalLength = 0, /* dynamic */
.dwClockFrequency = cpu_to_le32(48000000),
.bInCollection = 0, /* dynamic */
.baInterfaceNr[0] = 0, /* dynamic */
};
static const struct uvc_camera_terminal_descriptor uvc_camera_terminal = {
.bLength = UVC_DT_CAMERA_TERMINAL_SIZE(3),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VC_INPUT_TERMINAL,
.bTerminalID = 1,
.wTerminalType = cpu_to_le16(0x0201),
.bAssocTerminal = 0,
.iTerminal = 0,
.wObjectiveFocalLengthMin = cpu_to_le16(0),
.wObjectiveFocalLengthMax = cpu_to_le16(0),
.wOcularFocalLength = cpu_to_le16(0),
.bControlSize = 3,
.bmControls[0] = 2,
.bmControls[1] = 0,
.bmControls[2] = 0,
};
static const struct uvc_processing_unit_descriptor uvc_processing = {
.bLength = UVC_DT_PROCESSING_UNIT_SIZE(2),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VC_PROCESSING_UNIT,
.bUnitID = 2,
.bSourceID = 1,
.wMaxMultiplier = cpu_to_le16(16*1024),
.bControlSize = 2,
.bmControls[0] = 1,
.bmControls[1] = 0,
.iProcessing = 0,
};
static const struct uvc_output_terminal_descriptor uvc_output_terminal = {
.bLength = UVC_DT_OUTPUT_TERMINAL_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VC_OUTPUT_TERMINAL,
.bTerminalID = 3,
.wTerminalType = cpu_to_le16(0x0101),
.bAssocTerminal = 0,
.bSourceID = 2,
.iTerminal = 0,
};
DECLARE_UVC_INPUT_HEADER_DESCRIPTOR(1, 2);
static const struct UVC_INPUT_HEADER_DESCRIPTOR(1, 2) uvc_input_header = {
.bLength = UVC_DT_INPUT_HEADER_SIZE(1, 2),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VS_INPUT_HEADER,
.bNumFormats = 2,
.wTotalLength = 0, /* dynamic */
.bEndpointAddress = 0, /* dynamic */
.bmInfo = 0,
.bTerminalLink = 3,
.bStillCaptureMethod = 0,
.bTriggerSupport = 0,
.bTriggerUsage = 0,
.bControlSize = 1,
.bmaControls[0][0] = 0,
.bmaControls[1][0] = 4,
};
static const struct uvc_format_uncompressed uvc_format_yuv = {
.bLength = UVC_DT_FORMAT_UNCOMPRESSED_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VS_FORMAT_UNCOMPRESSED,
.bFormatIndex = 1,
.bNumFrameDescriptors = 2,
.guidFormat =
{ 'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00,
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71},
.bBitsPerPixel = 16,
.bDefaultFrameIndex = 1,
.bAspectRatioX = 0,
.bAspectRatioY = 0,
.bmInterfaceFlags = 0,
.bCopyProtect = 0,
};
DECLARE_UVC_FRAME_UNCOMPRESSED(1);
DECLARE_UVC_FRAME_UNCOMPRESSED(3);
static const struct UVC_FRAME_UNCOMPRESSED(3) uvc_frame_yuv_360p = {
.bLength = UVC_DT_FRAME_UNCOMPRESSED_SIZE(3),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VS_FRAME_UNCOMPRESSED,
.bFrameIndex = 1,
.bmCapabilities = 0,
.wWidth = cpu_to_le16(640),
.wHeight = cpu_to_le16(360),
.dwMinBitRate = cpu_to_le32(18432000),
.dwMaxBitRate = cpu_to_le32(55296000),
.dwMaxVideoFrameBufferSize = cpu_to_le32(460800),
.dwDefaultFrameInterval = cpu_to_le32(666666),
.bFrameIntervalType = 3,
.dwFrameInterval[0] = cpu_to_le32(666666),
.dwFrameInterval[1] = cpu_to_le32(1000000),
.dwFrameInterval[2] = cpu_to_le32(5000000),
};
static const struct UVC_FRAME_UNCOMPRESSED(1) uvc_frame_yuv_720p = {
.bLength = UVC_DT_FRAME_UNCOMPRESSED_SIZE(1),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VS_FRAME_UNCOMPRESSED,
.bFrameIndex = 2,
.bmCapabilities = 0,
.wWidth = cpu_to_le16(1280),
.wHeight = cpu_to_le16(720),
.dwMinBitRate = cpu_to_le32(29491200),
.dwMaxBitRate = cpu_to_le32(29491200),
.dwMaxVideoFrameBufferSize = cpu_to_le32(1843200),
.dwDefaultFrameInterval = cpu_to_le32(5000000),
.bFrameIntervalType = 1,
.dwFrameInterval[0] = cpu_to_le32(5000000),
};
static const struct uvc_format_mjpeg uvc_format_mjpg = {
.bLength = UVC_DT_FORMAT_MJPEG_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VS_FORMAT_MJPEG,
.bFormatIndex = 2,
.bNumFrameDescriptors = 2,
.bmFlags = 0,
.bDefaultFrameIndex = 1,
.bAspectRatioX = 0,
.bAspectRatioY = 0,
.bmInterfaceFlags = 0,
.bCopyProtect = 0,
};
DECLARE_UVC_FRAME_MJPEG(1);
DECLARE_UVC_FRAME_MJPEG(3);
static const struct UVC_FRAME_MJPEG(3) uvc_frame_mjpg_360p = {
.bLength = UVC_DT_FRAME_MJPEG_SIZE(3),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VS_FRAME_MJPEG,
.bFrameIndex = 1,
.bmCapabilities = 0,
.wWidth = cpu_to_le16(640),
.wHeight = cpu_to_le16(360),
.dwMinBitRate = cpu_to_le32(18432000),
.dwMaxBitRate = cpu_to_le32(55296000),
.dwMaxVideoFrameBufferSize = cpu_to_le32(460800),
.dwDefaultFrameInterval = cpu_to_le32(666666),
.bFrameIntervalType = 3,
.dwFrameInterval[0] = cpu_to_le32(666666),
.dwFrameInterval[1] = cpu_to_le32(1000000),
.dwFrameInterval[2] = cpu_to_le32(5000000),
};
static const struct UVC_FRAME_MJPEG(1) uvc_frame_mjpg_720p = {
.bLength = UVC_DT_FRAME_MJPEG_SIZE(1),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VS_FRAME_MJPEG,
.bFrameIndex = 2,
.bmCapabilities = 0,
.wWidth = cpu_to_le16(1280),
.wHeight = cpu_to_le16(720),
.dwMinBitRate = cpu_to_le32(29491200),
.dwMaxBitRate = cpu_to_le32(29491200),
.dwMaxVideoFrameBufferSize = cpu_to_le32(1843200),
.dwDefaultFrameInterval = cpu_to_le32(5000000),
.bFrameIntervalType = 1,
.dwFrameInterval[0] = cpu_to_le32(5000000),
};
static const struct uvc_color_matching_descriptor uvc_color_matching = {
.bLength = UVC_DT_COLOR_MATCHING_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = UVC_VS_COLORFORMAT,
.bColorPrimaries = 1,
.bTransferCharacteristics = 1,
.bMatrixCoefficients = 4,
};
static const struct uvc_descriptor_header * const uvc_fs_control_cls[] = {
(const struct uvc_descriptor_header *) &uvc_control_header,
(const struct uvc_descriptor_header *) &uvc_camera_terminal,
(const struct uvc_descriptor_header *) &uvc_processing,
(const struct uvc_descriptor_header *) &uvc_output_terminal,
NULL,
};
static const struct uvc_descriptor_header * const uvc_ss_control_cls[] = {
(const struct uvc_descriptor_header *) &uvc_control_header,
(const struct uvc_descriptor_header *) &uvc_camera_terminal,
(const struct uvc_descriptor_header *) &uvc_processing,
(const struct uvc_descriptor_header *) &uvc_output_terminal,
NULL,
};
static const struct uvc_descriptor_header * const uvc_fs_streaming_cls[] = {
(const struct uvc_descriptor_header *) &uvc_input_header,
(const struct uvc_descriptor_header *) &uvc_format_yuv,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
(const struct uvc_descriptor_header *) &uvc_format_mjpg,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
(const struct uvc_descriptor_header *) &uvc_color_matching,
NULL,
};
static const struct uvc_descriptor_header * const uvc_hs_streaming_cls[] = {
(const struct uvc_descriptor_header *) &uvc_input_header,
(const struct uvc_descriptor_header *) &uvc_format_yuv,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
(const struct uvc_descriptor_header *) &uvc_format_mjpg,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
(const struct uvc_descriptor_header *) &uvc_color_matching,
NULL,
};
static const struct uvc_descriptor_header * const uvc_ss_streaming_cls[] = {
(const struct uvc_descriptor_header *) &uvc_input_header,
(const struct uvc_descriptor_header *) &uvc_format_yuv,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
(const struct uvc_descriptor_header *) &uvc_format_mjpg,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
(const struct uvc_descriptor_header *) &uvc_color_matching,
NULL,
};
/* --------------------------------------------------------------------------
* USB configuration
*/
static int
webcam_config_bind(struct usb_configuration *c)
{
int status = 0;
f_uvc = usb_get_function(fi_uvc);
if (IS_ERR(f_uvc))
return PTR_ERR(f_uvc);
status = usb_add_function(c, f_uvc);
if (status < 0)
usb_put_function(f_uvc);
return status;
}
static struct usb_configuration webcam_config_driver = {
.label = webcam_config_label,
.bConfigurationValue = 1,
.iConfiguration = 0, /* dynamic */
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW,
};
static int
webcam_unbind(struct usb_composite_dev *cdev)
{
if (!IS_ERR_OR_NULL(f_uvc))
usb_put_function(f_uvc);
if (!IS_ERR_OR_NULL(fi_uvc))
usb_put_function_instance(fi_uvc);
return 0;
}
static int
webcam_bind(struct usb_composite_dev *cdev)
{
struct f_uvc_opts *uvc_opts;
int ret;
fi_uvc = usb_get_function_instance("uvc");
if (IS_ERR(fi_uvc))
return PTR_ERR(fi_uvc);
uvc_opts = container_of(fi_uvc, struct f_uvc_opts, func_inst);
uvc_opts->streaming_interval = streaming_interval;
uvc_opts->streaming_maxpacket = streaming_maxpacket;
uvc_opts->streaming_maxburst = streaming_maxburst;
uvc_set_trace_param(trace);
uvc_opts->fs_control = uvc_fs_control_cls;
uvc_opts->ss_control = uvc_ss_control_cls;
uvc_opts->fs_streaming = uvc_fs_streaming_cls;
uvc_opts->hs_streaming = uvc_hs_streaming_cls;
uvc_opts->ss_streaming = uvc_ss_streaming_cls;
/* Allocate string descriptor numbers ... note that string contents
* can be overridden by the composite_dev glue.
*/
ret = usb_string_ids_tab(cdev, webcam_strings);
if (ret < 0)
goto error;
webcam_device_descriptor.iManufacturer =
webcam_strings[USB_GADGET_MANUFACTURER_IDX].id;
webcam_device_descriptor.iProduct =
webcam_strings[USB_GADGET_PRODUCT_IDX].id;
webcam_config_driver.iConfiguration =
webcam_strings[STRING_DESCRIPTION_IDX].id;
/* Register our configuration. */
if ((ret = usb_add_config(cdev, &webcam_config_driver,
webcam_config_bind)) < 0)
goto error;
usb_composite_overwrite_options(cdev, &coverwrite);
INFO(cdev, "Webcam Video Gadget\n");
return 0;
error:
usb_put_function_instance(fi_uvc);
return ret;
}
/* --------------------------------------------------------------------------
* Driver
*/
static struct usb_composite_driver webcam_driver = {
.name = "g_webcam",
.dev = &webcam_device_descriptor,
.strings = webcam_device_strings,
.max_speed = USB_SPEED_SUPER,
.bind = webcam_bind,
.unbind = webcam_unbind,
};
module_usb_composite_driver(webcam_driver);
MODULE_AUTHOR("Laurent Pinchart");
MODULE_DESCRIPTION("Webcam Video Gadget");
MODULE_LICENSE("GPL");
|
