1 /*
2 * f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API)
3 *
4 * Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
5 *
6 * This driver doesn't expect any real Audio codec to be present
7 * on the device - the audio streams are simply sinked to and
8 * sourced from a virtual ALSA sound card created.
9 *
10 * This file is based on f_uac1.c which is
11 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
12 * Copyright (C) 2008 Analog Devices, Inc
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 */
19
20 #include <linux/usb/audio.h>
21 #include <linux/module.h>
22
23 #include "u_audio.h"
24 #include "u_uac1.h"
25
26 struct f_uac1 {
27 struct g_audio g_audio;
28 u8 ac_intf, as_in_intf, as_out_intf;
29 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
30 };
31
func_to_uac1(struct usb_function * f)32 static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
33 {
34 return container_of(f, struct f_uac1, g_audio.func);
35 }
36
37 /*
38 * DESCRIPTORS ... most are static, but strings and full
39 * configuration descriptors are built on demand.
40 */
41
42 /*
43 * We have three interfaces - one AudioControl and two AudioStreaming
44 *
45 * The driver implements a simple UAC_1 topology.
46 * USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture
47 * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
48 */
49 #define F_AUDIO_AC_INTERFACE 0
50 #define F_AUDIO_AS_OUT_INTERFACE 1
51 #define F_AUDIO_AS_IN_INTERFACE 2
52 /* Number of streaming interfaces */
53 #define F_AUDIO_NUM_INTERFACES 2
54
55 /* B.3.1 Standard AC Interface Descriptor */
56 static struct usb_interface_descriptor ac_interface_desc = {
57 .bLength = USB_DT_INTERFACE_SIZE,
58 .bDescriptorType = USB_DT_INTERFACE,
59 .bNumEndpoints = 0,
60 .bInterfaceClass = USB_CLASS_AUDIO,
61 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
62 };
63
64 /*
65 * The number of AudioStreaming and MIDIStreaming interfaces
66 * in the Audio Interface Collection
67 */
68 DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
69
70 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
71 /* 2 input terminals and 2 output terminals */
72 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \
73 + 2*UAC_DT_INPUT_TERMINAL_SIZE + 2*UAC_DT_OUTPUT_TERMINAL_SIZE)
74 /* B.3.2 Class-Specific AC Interface Descriptor */
75 static struct uac1_ac_header_descriptor_2 ac_header_desc = {
76 .bLength = UAC_DT_AC_HEADER_LENGTH,
77 .bDescriptorType = USB_DT_CS_INTERFACE,
78 .bDescriptorSubtype = UAC_HEADER,
79 .bcdADC = cpu_to_le16(0x0100),
80 .wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH),
81 .bInCollection = F_AUDIO_NUM_INTERFACES,
82 .baInterfaceNr = {
83 /* Interface number of the AudioStream interfaces */
84 [0] = 1,
85 [1] = 2,
86 }
87 };
88
89 #define USB_OUT_IT_ID 1
90 static struct uac_input_terminal_descriptor usb_out_it_desc = {
91 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
92 .bDescriptorType = USB_DT_CS_INTERFACE,
93 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
94 .bTerminalID = USB_OUT_IT_ID,
95 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
96 .bAssocTerminal = 0,
97 .wChannelConfig = cpu_to_le16(0x3),
98 };
99
100 #define IO_OUT_OT_ID 2
101 static struct uac1_output_terminal_descriptor io_out_ot_desc = {
102 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
103 .bDescriptorType = USB_DT_CS_INTERFACE,
104 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
105 .bTerminalID = IO_OUT_OT_ID,
106 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
107 .bAssocTerminal = 0,
108 .bSourceID = USB_OUT_IT_ID,
109 };
110
111 #define IO_IN_IT_ID 3
112 static struct uac_input_terminal_descriptor io_in_it_desc = {
113 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
114 .bDescriptorType = USB_DT_CS_INTERFACE,
115 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
116 .bTerminalID = IO_IN_IT_ID,
117 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
118 .bAssocTerminal = 0,
119 .wChannelConfig = cpu_to_le16(0x3),
120 };
121
122 #define USB_IN_OT_ID 4
123 static struct uac1_output_terminal_descriptor usb_in_ot_desc = {
124 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
125 .bDescriptorType = USB_DT_CS_INTERFACE,
126 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
127 .bTerminalID = USB_IN_OT_ID,
128 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
129 .bAssocTerminal = 0,
130 .bSourceID = IO_IN_IT_ID,
131 };
132
133 /* B.4.1 Standard AS Interface Descriptor */
134 static struct usb_interface_descriptor as_out_interface_alt_0_desc = {
135 .bLength = USB_DT_INTERFACE_SIZE,
136 .bDescriptorType = USB_DT_INTERFACE,
137 .bAlternateSetting = 0,
138 .bNumEndpoints = 0,
139 .bInterfaceClass = USB_CLASS_AUDIO,
140 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
141 };
142
143 static struct usb_interface_descriptor as_out_interface_alt_1_desc = {
144 .bLength = USB_DT_INTERFACE_SIZE,
145 .bDescriptorType = USB_DT_INTERFACE,
146 .bAlternateSetting = 1,
147 .bNumEndpoints = 1,
148 .bInterfaceClass = USB_CLASS_AUDIO,
149 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
150 };
151
152 static struct usb_interface_descriptor as_in_interface_alt_0_desc = {
153 .bLength = USB_DT_INTERFACE_SIZE,
154 .bDescriptorType = USB_DT_INTERFACE,
155 .bAlternateSetting = 0,
156 .bNumEndpoints = 0,
157 .bInterfaceClass = USB_CLASS_AUDIO,
158 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
159 };
160
161 static struct usb_interface_descriptor as_in_interface_alt_1_desc = {
162 .bLength = USB_DT_INTERFACE_SIZE,
163 .bDescriptorType = USB_DT_INTERFACE,
164 .bAlternateSetting = 1,
165 .bNumEndpoints = 1,
166 .bInterfaceClass = USB_CLASS_AUDIO,
167 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
168 };
169
170 /* B.4.2 Class-Specific AS Interface Descriptor */
171 static struct uac1_as_header_descriptor as_out_header_desc = {
172 .bLength = UAC_DT_AS_HEADER_SIZE,
173 .bDescriptorType = USB_DT_CS_INTERFACE,
174 .bDescriptorSubtype = UAC_AS_GENERAL,
175 .bTerminalLink = USB_OUT_IT_ID,
176 .bDelay = 1,
177 .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
178 };
179
180 static struct uac1_as_header_descriptor as_in_header_desc = {
181 .bLength = UAC_DT_AS_HEADER_SIZE,
182 .bDescriptorType = USB_DT_CS_INTERFACE,
183 .bDescriptorSubtype = UAC_AS_GENERAL,
184 .bTerminalLink = USB_IN_OT_ID,
185 .bDelay = 1,
186 .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
187 };
188
189 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
190
191 static struct uac_format_type_i_discrete_descriptor_1 as_out_type_i_desc = {
192 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
193 .bDescriptorType = USB_DT_CS_INTERFACE,
194 .bDescriptorSubtype = UAC_FORMAT_TYPE,
195 .bFormatType = UAC_FORMAT_TYPE_I,
196 .bSubframeSize = 2,
197 .bBitResolution = 16,
198 .bSamFreqType = 1,
199 };
200
201 /* Standard ISO OUT Endpoint Descriptor */
202 static struct usb_endpoint_descriptor as_out_ep_desc = {
203 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
204 .bDescriptorType = USB_DT_ENDPOINT,
205 .bEndpointAddress = USB_DIR_OUT,
206 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
207 | USB_ENDPOINT_XFER_ISOC,
208 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
209 .bInterval = 4,
210 };
211
212 /* Class-specific AS ISO OUT Endpoint Descriptor */
213 static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
214 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
215 .bDescriptorType = USB_DT_CS_ENDPOINT,
216 .bDescriptorSubtype = UAC_EP_GENERAL,
217 .bmAttributes = 1,
218 .bLockDelayUnits = 1,
219 .wLockDelay = cpu_to_le16(1),
220 };
221
222 static struct uac_format_type_i_discrete_descriptor_1 as_in_type_i_desc = {
223 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
224 .bDescriptorType = USB_DT_CS_INTERFACE,
225 .bDescriptorSubtype = UAC_FORMAT_TYPE,
226 .bFormatType = UAC_FORMAT_TYPE_I,
227 .bSubframeSize = 2,
228 .bBitResolution = 16,
229 .bSamFreqType = 1,
230 };
231
232 /* Standard ISO OUT Endpoint Descriptor */
233 static struct usb_endpoint_descriptor as_in_ep_desc = {
234 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
235 .bDescriptorType = USB_DT_ENDPOINT,
236 .bEndpointAddress = USB_DIR_IN,
237 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
238 | USB_ENDPOINT_XFER_ISOC,
239 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
240 .bInterval = 4,
241 };
242
243 /* Class-specific AS ISO OUT Endpoint Descriptor */
244 static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
245 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
246 .bDescriptorType = USB_DT_CS_ENDPOINT,
247 .bDescriptorSubtype = UAC_EP_GENERAL,
248 .bmAttributes = 1,
249 .bLockDelayUnits = 0,
250 .wLockDelay = 0,
251 };
252
253 static struct usb_descriptor_header *f_audio_desc[] = {
254 (struct usb_descriptor_header *)&ac_interface_desc,
255 (struct usb_descriptor_header *)&ac_header_desc,
256
257 (struct usb_descriptor_header *)&usb_out_it_desc,
258 (struct usb_descriptor_header *)&io_out_ot_desc,
259 (struct usb_descriptor_header *)&io_in_it_desc,
260 (struct usb_descriptor_header *)&usb_in_ot_desc,
261
262 (struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
263 (struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
264 (struct usb_descriptor_header *)&as_out_header_desc,
265
266 (struct usb_descriptor_header *)&as_out_type_i_desc,
267
268 (struct usb_descriptor_header *)&as_out_ep_desc,
269 (struct usb_descriptor_header *)&as_iso_out_desc,
270
271 (struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
272 (struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
273 (struct usb_descriptor_header *)&as_in_header_desc,
274
275 (struct usb_descriptor_header *)&as_in_type_i_desc,
276
277 (struct usb_descriptor_header *)&as_in_ep_desc,
278 (struct usb_descriptor_header *)&as_iso_in_desc,
279 NULL,
280 };
281
282 enum {
283 STR_AC_IF,
284 STR_USB_OUT_IT,
285 STR_USB_OUT_IT_CH_NAMES,
286 STR_IO_OUT_OT,
287 STR_IO_IN_IT,
288 STR_IO_IN_IT_CH_NAMES,
289 STR_USB_IN_OT,
290 STR_AS_OUT_IF_ALT0,
291 STR_AS_OUT_IF_ALT1,
292 STR_AS_IN_IF_ALT0,
293 STR_AS_IN_IF_ALT1,
294 };
295
296 static struct usb_string strings_uac1[] = {
297 [STR_AC_IF].s = "AC Interface",
298 [STR_USB_OUT_IT].s = "Playback Input terminal",
299 [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
300 [STR_IO_OUT_OT].s = "Playback Output terminal",
301 [STR_IO_IN_IT].s = "Capture Input terminal",
302 [STR_IO_IN_IT_CH_NAMES].s = "Capture Channels",
303 [STR_USB_IN_OT].s = "Capture Output terminal",
304 [STR_AS_OUT_IF_ALT0].s = "Playback Inactive",
305 [STR_AS_OUT_IF_ALT1].s = "Playback Active",
306 [STR_AS_IN_IF_ALT0].s = "Capture Inactive",
307 [STR_AS_IN_IF_ALT1].s = "Capture Active",
308 { },
309 };
310
311 static struct usb_gadget_strings str_uac1 = {
312 .language = 0x0409, /* en-us */
313 .strings = strings_uac1,
314 };
315
316 static struct usb_gadget_strings *uac1_strings[] = {
317 &str_uac1,
318 NULL,
319 };
320
321 /*
322 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
323 */
324
audio_set_endpoint_req(struct usb_function * f,const struct usb_ctrlrequest * ctrl)325 static int audio_set_endpoint_req(struct usb_function *f,
326 const struct usb_ctrlrequest *ctrl)
327 {
328 struct usb_composite_dev *cdev = f->config->cdev;
329 int value = -EOPNOTSUPP;
330 u16 ep = le16_to_cpu(ctrl->wIndex);
331 u16 len = le16_to_cpu(ctrl->wLength);
332 u16 w_value = le16_to_cpu(ctrl->wValue);
333
334 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
335 ctrl->bRequest, w_value, len, ep);
336
337 switch (ctrl->bRequest) {
338 case UAC_SET_CUR:
339 value = len;
340 break;
341
342 case UAC_SET_MIN:
343 break;
344
345 case UAC_SET_MAX:
346 break;
347
348 case UAC_SET_RES:
349 break;
350
351 case UAC_SET_MEM:
352 break;
353
354 default:
355 break;
356 }
357
358 return value;
359 }
360
audio_get_endpoint_req(struct usb_function * f,const struct usb_ctrlrequest * ctrl)361 static int audio_get_endpoint_req(struct usb_function *f,
362 const struct usb_ctrlrequest *ctrl)
363 {
364 struct usb_composite_dev *cdev = f->config->cdev;
365 int value = -EOPNOTSUPP;
366 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
367 u16 len = le16_to_cpu(ctrl->wLength);
368 u16 w_value = le16_to_cpu(ctrl->wValue);
369
370 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
371 ctrl->bRequest, w_value, len, ep);
372
373 switch (ctrl->bRequest) {
374 case UAC_GET_CUR:
375 case UAC_GET_MIN:
376 case UAC_GET_MAX:
377 case UAC_GET_RES:
378 value = len;
379 break;
380 case UAC_GET_MEM:
381 break;
382 default:
383 break;
384 }
385
386 return value;
387 }
388
389 static int
f_audio_setup(struct usb_function * f,const struct usb_ctrlrequest * ctrl)390 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
391 {
392 struct usb_composite_dev *cdev = f->config->cdev;
393 struct usb_request *req = cdev->req;
394 int value = -EOPNOTSUPP;
395 u16 w_index = le16_to_cpu(ctrl->wIndex);
396 u16 w_value = le16_to_cpu(ctrl->wValue);
397 u16 w_length = le16_to_cpu(ctrl->wLength);
398
399 /* composite driver infrastructure handles everything; interface
400 * activation uses set_alt().
401 */
402 switch (ctrl->bRequestType) {
403 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
404 value = audio_set_endpoint_req(f, ctrl);
405 break;
406
407 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
408 value = audio_get_endpoint_req(f, ctrl);
409 break;
410
411 default:
412 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
413 ctrl->bRequestType, ctrl->bRequest,
414 w_value, w_index, w_length);
415 }
416
417 /* respond with data transfer or status phase? */
418 if (value >= 0) {
419 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
420 ctrl->bRequestType, ctrl->bRequest,
421 w_value, w_index, w_length);
422 req->zero = 0;
423 req->length = value;
424 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
425 if (value < 0)
426 ERROR(cdev, "audio response on err %d\n", value);
427 }
428
429 /* device either stalls (value < 0) or reports success */
430 return value;
431 }
432
f_audio_set_alt(struct usb_function * f,unsigned intf,unsigned alt)433 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
434 {
435 struct usb_composite_dev *cdev = f->config->cdev;
436 struct usb_gadget *gadget = cdev->gadget;
437 struct device *dev = &gadget->dev;
438 struct f_uac1 *uac1 = func_to_uac1(f);
439 int ret = 0;
440
441 /* No i/f has more than 2 alt settings */
442 if (alt > 1) {
443 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
444 return -EINVAL;
445 }
446
447 if (intf == uac1->ac_intf) {
448 /* Control I/f has only 1 AltSetting - 0 */
449 if (alt) {
450 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
451 return -EINVAL;
452 }
453 return 0;
454 }
455
456 if (intf == uac1->as_out_intf) {
457 uac1->as_out_alt = alt;
458
459 if (alt)
460 ret = u_audio_start_capture(&uac1->g_audio);
461 else
462 u_audio_stop_capture(&uac1->g_audio);
463 } else if (intf == uac1->as_in_intf) {
464 uac1->as_in_alt = alt;
465
466 if (alt)
467 ret = u_audio_start_playback(&uac1->g_audio);
468 else
469 u_audio_stop_playback(&uac1->g_audio);
470 } else {
471 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
472 return -EINVAL;
473 }
474
475 return ret;
476 }
477
f_audio_get_alt(struct usb_function * f,unsigned intf)478 static int f_audio_get_alt(struct usb_function *f, unsigned intf)
479 {
480 struct usb_composite_dev *cdev = f->config->cdev;
481 struct usb_gadget *gadget = cdev->gadget;
482 struct device *dev = &gadget->dev;
483 struct f_uac1 *uac1 = func_to_uac1(f);
484
485 if (intf == uac1->ac_intf)
486 return uac1->ac_alt;
487 else if (intf == uac1->as_out_intf)
488 return uac1->as_out_alt;
489 else if (intf == uac1->as_in_intf)
490 return uac1->as_in_alt;
491 else
492 dev_err(dev, "%s:%d Invalid Interface %d!\n",
493 __func__, __LINE__, intf);
494
495 return -EINVAL;
496 }
497
498
f_audio_disable(struct usb_function * f)499 static void f_audio_disable(struct usb_function *f)
500 {
501 struct f_uac1 *uac1 = func_to_uac1(f);
502
503 uac1->as_out_alt = 0;
504 uac1->as_in_alt = 0;
505
506 u_audio_stop_capture(&uac1->g_audio);
507 }
508
509 /*-------------------------------------------------------------------------*/
510
511 /* audio function driver setup/binding */
f_audio_bind(struct usb_configuration * c,struct usb_function * f)512 static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
513 {
514 struct usb_composite_dev *cdev = c->cdev;
515 struct usb_gadget *gadget = cdev->gadget;
516 struct f_uac1 *uac1 = func_to_uac1(f);
517 struct g_audio *audio = func_to_g_audio(f);
518 struct f_uac1_opts *audio_opts;
519 struct usb_ep *ep = NULL;
520 struct usb_string *us;
521 u8 *sam_freq;
522 int rate;
523 int status;
524
525 audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
526
527 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
528 if (IS_ERR(us))
529 return PTR_ERR(us);
530 ac_interface_desc.iInterface = us[STR_AC_IF].id;
531 usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
532 usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
533 io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id;
534 as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id;
535 as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id;
536 io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id;
537 io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id;
538 usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id;
539 as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id;
540 as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id;
541
542 /* Set channel numbers */
543 usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask);
544 usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask);
545 as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask);
546 as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize;
547 as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8;
548 io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask);
549 io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask);
550 as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask);
551 as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize;
552 as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8;
553
554 /* Set sample rates */
555 rate = audio_opts->c_srate;
556 sam_freq = as_out_type_i_desc.tSamFreq[0];
557 memcpy(sam_freq, &rate, 3);
558 rate = audio_opts->p_srate;
559 sam_freq = as_in_type_i_desc.tSamFreq[0];
560 memcpy(sam_freq, &rate, 3);
561
562 /* allocate instance-specific interface IDs, and patch descriptors */
563 status = usb_interface_id(c, f);
564 if (status < 0)
565 goto fail;
566 ac_interface_desc.bInterfaceNumber = status;
567 uac1->ac_intf = status;
568 uac1->ac_alt = 0;
569
570 status = usb_interface_id(c, f);
571 if (status < 0)
572 goto fail;
573 as_out_interface_alt_0_desc.bInterfaceNumber = status;
574 as_out_interface_alt_1_desc.bInterfaceNumber = status;
575 uac1->as_out_intf = status;
576 uac1->as_out_alt = 0;
577
578 status = usb_interface_id(c, f);
579 if (status < 0)
580 goto fail;
581 as_in_interface_alt_0_desc.bInterfaceNumber = status;
582 as_in_interface_alt_1_desc.bInterfaceNumber = status;
583 uac1->as_in_intf = status;
584 uac1->as_in_alt = 0;
585
586 audio->gadget = gadget;
587
588 status = -ENODEV;
589
590 /* allocate instance-specific endpoints */
591 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
592 if (!ep)
593 goto fail;
594 audio->out_ep = ep;
595 audio->out_ep->desc = &as_out_ep_desc;
596
597 ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
598 if (!ep)
599 goto fail;
600 audio->in_ep = ep;
601 audio->in_ep->desc = &as_in_ep_desc;
602
603 /* copy descriptors, and track endpoint copies */
604 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
605 NULL);
606 if (status)
607 goto fail;
608
609 audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
610 audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
611 audio->params.c_chmask = audio_opts->c_chmask;
612 audio->params.c_srate = audio_opts->c_srate;
613 audio->params.c_ssize = audio_opts->c_ssize;
614 audio->params.p_chmask = audio_opts->p_chmask;
615 audio->params.p_srate = audio_opts->p_srate;
616 audio->params.p_ssize = audio_opts->p_ssize;
617 audio->params.req_number = audio_opts->req_number;
618
619 status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
620 if (status)
621 goto err_card_register;
622
623 return 0;
624
625 err_card_register:
626 usb_free_all_descriptors(f);
627 fail:
628 return status;
629 }
630
631 /*-------------------------------------------------------------------------*/
632
to_f_uac1_opts(struct config_item * item)633 static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
634 {
635 return container_of(to_config_group(item), struct f_uac1_opts,
636 func_inst.group);
637 }
638
f_uac1_attr_release(struct config_item * item)639 static void f_uac1_attr_release(struct config_item *item)
640 {
641 struct f_uac1_opts *opts = to_f_uac1_opts(item);
642
643 usb_put_function_instance(&opts->func_inst);
644 }
645
646 static struct configfs_item_operations f_uac1_item_ops = {
647 .release = f_uac1_attr_release,
648 };
649
650 #define UAC1_ATTRIBUTE(name) \
651 static ssize_t f_uac1_opts_##name##_show( \
652 struct config_item *item, \
653 char *page) \
654 { \
655 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
656 int result; \
657 \
658 mutex_lock(&opts->lock); \
659 result = sprintf(page, "%u\n", opts->name); \
660 mutex_unlock(&opts->lock); \
661 \
662 return result; \
663 } \
664 \
665 static ssize_t f_uac1_opts_##name##_store( \
666 struct config_item *item, \
667 const char *page, size_t len) \
668 { \
669 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
670 int ret; \
671 u32 num; \
672 \
673 mutex_lock(&opts->lock); \
674 if (opts->refcnt) { \
675 ret = -EBUSY; \
676 goto end; \
677 } \
678 \
679 ret = kstrtou32(page, 0, &num); \
680 if (ret) \
681 goto end; \
682 \
683 opts->name = num; \
684 ret = len; \
685 \
686 end: \
687 mutex_unlock(&opts->lock); \
688 return ret; \
689 } \
690 \
691 CONFIGFS_ATTR(f_uac1_opts_, name)
692
693 UAC1_ATTRIBUTE(c_chmask);
694 UAC1_ATTRIBUTE(c_srate);
695 UAC1_ATTRIBUTE(c_ssize);
696 UAC1_ATTRIBUTE(p_chmask);
697 UAC1_ATTRIBUTE(p_srate);
698 UAC1_ATTRIBUTE(p_ssize);
699 UAC1_ATTRIBUTE(req_number);
700
701 static struct configfs_attribute *f_uac1_attrs[] = {
702 &f_uac1_opts_attr_c_chmask,
703 &f_uac1_opts_attr_c_srate,
704 &f_uac1_opts_attr_c_ssize,
705 &f_uac1_opts_attr_p_chmask,
706 &f_uac1_opts_attr_p_srate,
707 &f_uac1_opts_attr_p_ssize,
708 &f_uac1_opts_attr_req_number,
709 NULL,
710 };
711
712 static struct config_item_type f_uac1_func_type = {
713 .ct_item_ops = &f_uac1_item_ops,
714 .ct_attrs = f_uac1_attrs,
715 .ct_owner = THIS_MODULE,
716 };
717
f_audio_free_inst(struct usb_function_instance * f)718 static void f_audio_free_inst(struct usb_function_instance *f)
719 {
720 struct f_uac1_opts *opts;
721
722 opts = container_of(f, struct f_uac1_opts, func_inst);
723 kfree(opts);
724 }
725
f_audio_alloc_inst(void)726 static struct usb_function_instance *f_audio_alloc_inst(void)
727 {
728 struct f_uac1_opts *opts;
729
730 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
731 if (!opts)
732 return ERR_PTR(-ENOMEM);
733
734 mutex_init(&opts->lock);
735 opts->func_inst.free_func_inst = f_audio_free_inst;
736
737 config_group_init_type_name(&opts->func_inst.group, "",
738 &f_uac1_func_type);
739
740 opts->c_chmask = UAC1_DEF_CCHMASK;
741 opts->c_srate = UAC1_DEF_CSRATE;
742 opts->c_ssize = UAC1_DEF_CSSIZE;
743 opts->p_chmask = UAC1_DEF_PCHMASK;
744 opts->p_srate = UAC1_DEF_PSRATE;
745 opts->p_ssize = UAC1_DEF_PSSIZE;
746 opts->req_number = UAC1_DEF_REQ_NUM;
747 return &opts->func_inst;
748 }
749
f_audio_free(struct usb_function * f)750 static void f_audio_free(struct usb_function *f)
751 {
752 struct g_audio *audio;
753 struct f_uac1_opts *opts;
754
755 audio = func_to_g_audio(f);
756 opts = container_of(f->fi, struct f_uac1_opts, func_inst);
757 kfree(audio);
758 mutex_lock(&opts->lock);
759 --opts->refcnt;
760 mutex_unlock(&opts->lock);
761 }
762
f_audio_unbind(struct usb_configuration * c,struct usb_function * f)763 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
764 {
765 struct g_audio *audio = func_to_g_audio(f);
766
767 g_audio_cleanup(audio);
768 usb_free_all_descriptors(f);
769
770 audio->gadget = NULL;
771 }
772
f_audio_alloc(struct usb_function_instance * fi)773 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
774 {
775 struct f_uac1 *uac1;
776 struct f_uac1_opts *opts;
777
778 /* allocate and initialize one new instance */
779 uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
780 if (!uac1)
781 return ERR_PTR(-ENOMEM);
782
783 opts = container_of(fi, struct f_uac1_opts, func_inst);
784 mutex_lock(&opts->lock);
785 ++opts->refcnt;
786 mutex_unlock(&opts->lock);
787
788 uac1->g_audio.func.name = "uac1_func";
789 uac1->g_audio.func.bind = f_audio_bind;
790 uac1->g_audio.func.unbind = f_audio_unbind;
791 uac1->g_audio.func.set_alt = f_audio_set_alt;
792 uac1->g_audio.func.get_alt = f_audio_get_alt;
793 uac1->g_audio.func.setup = f_audio_setup;
794 uac1->g_audio.func.disable = f_audio_disable;
795 uac1->g_audio.func.free_func = f_audio_free;
796
797 return &uac1->g_audio.func;
798 }
799
800 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
801 MODULE_LICENSE("GPL");
802 MODULE_AUTHOR("Ruslan Bilovol");
803