1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * f_audio.c -- USB Audio class function driver
4 *
5 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
6 * Copyright (C) 2008 Analog Devices, Inc
7 */
8
9 #include <linux/slab.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/device.h>
13 #include <linux/atomic.h>
14
15 #include "u_uac1_legacy.h"
16
17 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
18 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
19
20 /*
21 * DESCRIPTORS ... most are static, but strings and full
22 * configuration descriptors are built on demand.
23 */
24
25 /*
26 * We have two interfaces- AudioControl and AudioStreaming
27 * TODO: only supcard playback currently
28 */
29 #define F_AUDIO_AC_INTERFACE 0
30 #define F_AUDIO_AS_INTERFACE 1
31 #define F_AUDIO_NUM_INTERFACES 1
32
33 /* B.3.1 Standard AC Interface Descriptor */
34 static struct usb_interface_descriptor ac_interface_desc = {
35 .bLength = USB_DT_INTERFACE_SIZE,
36 .bDescriptorType = USB_DT_INTERFACE,
37 .bNumEndpoints = 0,
38 .bInterfaceClass = USB_CLASS_AUDIO,
39 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
40 };
41
42 /*
43 * The number of AudioStreaming and MIDIStreaming interfaces
44 * in the Audio Interface Collection
45 */
46 DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
47
48 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
49 /* 1 input terminal, 1 output terminal and 1 feature unit */
50 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
51 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
52 /* B.3.2 Class-Specific AC Interface Descriptor */
53 static struct uac1_ac_header_descriptor_1 ac_header_desc = {
54 .bLength = UAC_DT_AC_HEADER_LENGTH,
55 .bDescriptorType = USB_DT_CS_INTERFACE,
56 .bDescriptorSubtype = UAC_HEADER,
57 .bcdADC = cpu_to_le16(0x0100),
58 .wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH),
59 .bInCollection = F_AUDIO_NUM_INTERFACES,
60 .baInterfaceNr = {
61 /* Interface number of the first AudioStream interface */
62 [0] = 1,
63 }
64 };
65
66 #define INPUT_TERMINAL_ID 1
67 static struct uac_input_terminal_descriptor input_terminal_desc = {
68 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
69 .bDescriptorType = USB_DT_CS_INTERFACE,
70 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
71 .bTerminalID = INPUT_TERMINAL_ID,
72 .wTerminalType = UAC_TERMINAL_STREAMING,
73 .bAssocTerminal = 0,
74 .wChannelConfig = 0x3,
75 };
76
77 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
78
79 #define FEATURE_UNIT_ID 2
80 static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
81 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
82 .bDescriptorType = USB_DT_CS_INTERFACE,
83 .bDescriptorSubtype = UAC_FEATURE_UNIT,
84 .bUnitID = FEATURE_UNIT_ID,
85 .bSourceID = INPUT_TERMINAL_ID,
86 .bControlSize = 2,
87 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
88 };
89
90 static struct usb_audio_control mute_control = {
91 .list = LIST_HEAD_INIT(mute_control.list),
92 .name = "Mute Control",
93 .type = UAC_FU_MUTE,
94 /* Todo: add real Mute control code */
95 .set = generic_set_cmd,
96 .get = generic_get_cmd,
97 };
98
99 static struct usb_audio_control volume_control = {
100 .list = LIST_HEAD_INIT(volume_control.list),
101 .name = "Volume Control",
102 .type = UAC_FU_VOLUME,
103 /* Todo: add real Volume control code */
104 .set = generic_set_cmd,
105 .get = generic_get_cmd,
106 };
107
108 static struct usb_audio_control_selector feature_unit = {
109 .list = LIST_HEAD_INIT(feature_unit.list),
110 .id = FEATURE_UNIT_ID,
111 .name = "Mute & Volume Control",
112 .type = UAC_FEATURE_UNIT,
113 .desc = (struct usb_descriptor_header *)&feature_unit_desc,
114 };
115
116 #define OUTPUT_TERMINAL_ID 3
117 static struct uac1_output_terminal_descriptor output_terminal_desc = {
118 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
119 .bDescriptorType = USB_DT_CS_INTERFACE,
120 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
121 .bTerminalID = OUTPUT_TERMINAL_ID,
122 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
123 .bAssocTerminal = FEATURE_UNIT_ID,
124 .bSourceID = FEATURE_UNIT_ID,
125 };
126
127 /* B.4.1 Standard AS Interface Descriptor */
128 static struct usb_interface_descriptor as_interface_alt_0_desc = {
129 .bLength = USB_DT_INTERFACE_SIZE,
130 .bDescriptorType = USB_DT_INTERFACE,
131 .bAlternateSetting = 0,
132 .bNumEndpoints = 0,
133 .bInterfaceClass = USB_CLASS_AUDIO,
134 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
135 };
136
137 static struct usb_interface_descriptor as_interface_alt_1_desc = {
138 .bLength = USB_DT_INTERFACE_SIZE,
139 .bDescriptorType = USB_DT_INTERFACE,
140 .bAlternateSetting = 1,
141 .bNumEndpoints = 1,
142 .bInterfaceClass = USB_CLASS_AUDIO,
143 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
144 };
145
146 /* B.4.2 Class-Specific AS Interface Descriptor */
147 static struct uac1_as_header_descriptor as_header_desc = {
148 .bLength = UAC_DT_AS_HEADER_SIZE,
149 .bDescriptorType = USB_DT_CS_INTERFACE,
150 .bDescriptorSubtype = UAC_AS_GENERAL,
151 .bTerminalLink = INPUT_TERMINAL_ID,
152 .bDelay = 1,
153 .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
154 };
155
156 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
157
158 static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
159 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
160 .bDescriptorType = USB_DT_CS_INTERFACE,
161 .bDescriptorSubtype = UAC_FORMAT_TYPE,
162 .bFormatType = UAC_FORMAT_TYPE_I,
163 .bSubframeSize = 2,
164 .bBitResolution = 16,
165 .bSamFreqType = 1,
166 };
167
168 /* Standard ISO OUT Endpoint Descriptor */
169 static struct usb_endpoint_descriptor as_out_ep_desc = {
170 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
171 .bDescriptorType = USB_DT_ENDPOINT,
172 .bEndpointAddress = USB_DIR_OUT,
173 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
174 | USB_ENDPOINT_XFER_ISOC,
175 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
176 .bInterval = 4,
177 };
178
179 /* Class-specific AS ISO OUT Endpoint Descriptor */
180 static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
181 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
182 .bDescriptorType = USB_DT_CS_ENDPOINT,
183 .bDescriptorSubtype = UAC_EP_GENERAL,
184 .bmAttributes = 1,
185 .bLockDelayUnits = 1,
186 .wLockDelay = cpu_to_le16(1),
187 };
188
189 static struct usb_descriptor_header *f_audio_desc[] = {
190 (struct usb_descriptor_header *)&ac_interface_desc,
191 (struct usb_descriptor_header *)&ac_header_desc,
192
193 (struct usb_descriptor_header *)&input_terminal_desc,
194 (struct usb_descriptor_header *)&output_terminal_desc,
195 (struct usb_descriptor_header *)&feature_unit_desc,
196
197 (struct usb_descriptor_header *)&as_interface_alt_0_desc,
198 (struct usb_descriptor_header *)&as_interface_alt_1_desc,
199 (struct usb_descriptor_header *)&as_header_desc,
200
201 (struct usb_descriptor_header *)&as_type_i_desc,
202
203 (struct usb_descriptor_header *)&as_out_ep_desc,
204 (struct usb_descriptor_header *)&as_iso_out_desc,
205 NULL,
206 };
207
208 enum {
209 STR_AC_IF,
210 STR_INPUT_TERMINAL,
211 STR_INPUT_TERMINAL_CH_NAMES,
212 STR_FEAT_DESC_0,
213 STR_OUTPUT_TERMINAL,
214 STR_AS_IF_ALT0,
215 STR_AS_IF_ALT1,
216 };
217
218 static struct usb_string strings_uac1[] = {
219 [STR_AC_IF].s = "AC Interface",
220 [STR_INPUT_TERMINAL].s = "Input terminal",
221 [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels",
222 [STR_FEAT_DESC_0].s = "Volume control & mute",
223 [STR_OUTPUT_TERMINAL].s = "Output terminal",
224 [STR_AS_IF_ALT0].s = "AS Interface",
225 [STR_AS_IF_ALT1].s = "AS Interface",
226 { },
227 };
228
229 static struct usb_gadget_strings str_uac1 = {
230 .language = 0x0409, /* en-us */
231 .strings = strings_uac1,
232 };
233
234 static struct usb_gadget_strings *uac1_strings[] = {
235 &str_uac1,
236 NULL,
237 };
238
239 /*
240 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
241 */
242
243 /*-------------------------------------------------------------------------*/
244 struct f_audio_buf {
245 u8 *buf;
246 int actual;
247 struct list_head list;
248 };
249
f_audio_buffer_alloc(int buf_size)250 static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
251 {
252 struct f_audio_buf *copy_buf;
253
254 copy_buf = kzalloc_obj(*copy_buf, GFP_ATOMIC);
255 if (!copy_buf)
256 return ERR_PTR(-ENOMEM);
257
258 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
259 if (!copy_buf->buf) {
260 kfree(copy_buf);
261 return ERR_PTR(-ENOMEM);
262 }
263
264 return copy_buf;
265 }
266
f_audio_buffer_free(struct f_audio_buf * audio_buf)267 static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
268 {
269 kfree(audio_buf->buf);
270 kfree(audio_buf);
271 }
272 /*-------------------------------------------------------------------------*/
273
274 struct f_audio {
275 struct gaudio card;
276
277 u8 ac_intf, ac_alt;
278 u8 as_intf, as_alt;
279
280 /* endpoints handle full and/or high speeds */
281 struct usb_ep *out_ep;
282
283 spinlock_t lock;
284 struct f_audio_buf *copy_buf;
285 struct work_struct playback_work;
286 struct list_head play_queue;
287
288 /* Control Set command */
289 struct list_head cs;
290 u8 set_cmd;
291 struct usb_audio_control *set_con;
292 };
293
func_to_audio(struct usb_function * f)294 static inline struct f_audio *func_to_audio(struct usb_function *f)
295 {
296 return container_of(f, struct f_audio, card.func);
297 }
298
299 /*-------------------------------------------------------------------------*/
300
f_audio_playback_work(struct work_struct * data)301 static void f_audio_playback_work(struct work_struct *data)
302 {
303 struct f_audio *audio = container_of(data, struct f_audio,
304 playback_work);
305 struct f_audio_buf *play_buf;
306
307 spin_lock_irq(&audio->lock);
308 if (list_empty(&audio->play_queue)) {
309 spin_unlock_irq(&audio->lock);
310 return;
311 }
312 play_buf = list_first_entry(&audio->play_queue,
313 struct f_audio_buf, list);
314 list_del(&play_buf->list);
315 spin_unlock_irq(&audio->lock);
316
317 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
318 f_audio_buffer_free(play_buf);
319 }
320
f_audio_out_ep_complete(struct usb_ep * ep,struct usb_request * req)321 static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
322 {
323 struct f_audio *audio = req->context;
324 struct usb_composite_dev *cdev = audio->card.func.config->cdev;
325 struct f_audio_buf *copy_buf = audio->copy_buf;
326 struct f_uac1_legacy_opts *opts;
327 int audio_buf_size;
328 int err;
329
330 opts = container_of(audio->card.func.fi, struct f_uac1_legacy_opts,
331 func_inst);
332 audio_buf_size = opts->audio_buf_size;
333
334 if (!copy_buf)
335 return -EINVAL;
336
337 /* Copy buffer is full, add it to the play_queue */
338 if (audio_buf_size - copy_buf->actual < req->actual) {
339 spin_lock_irq(&audio->lock);
340 list_add_tail(©_buf->list, &audio->play_queue);
341 spin_unlock_irq(&audio->lock);
342 schedule_work(&audio->playback_work);
343 copy_buf = f_audio_buffer_alloc(audio_buf_size);
344 if (IS_ERR(copy_buf))
345 return -ENOMEM;
346 }
347
348 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
349 copy_buf->actual += req->actual;
350 audio->copy_buf = copy_buf;
351
352 err = usb_ep_queue(ep, req, GFP_ATOMIC);
353 if (err)
354 ERROR(cdev, "%s queue req: %d\n", ep->name, err);
355
356 return 0;
357
358 }
359
f_audio_complete(struct usb_ep * ep,struct usb_request * req)360 static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
361 {
362 struct f_audio *audio = req->context;
363 struct usb_ep *out_ep = audio->out_ep;
364
365 switch (req->status) {
366 case 0:
367 if (ep == out_ep) {
368 f_audio_out_ep_complete(ep, req);
369 } else if (audio->set_con) {
370 struct usb_audio_control *con = audio->set_con;
371 u8 type = con->type;
372 u32 data;
373 bool valid_request = false;
374
375 switch (type) {
376 case UAC_FU_MUTE: {
377 u8 value;
378
379 if (req->actual == sizeof(value)) {
380 memcpy(&value, req->buf, sizeof(value));
381 data = value;
382 valid_request = true;
383 }
384 break;
385 }
386 case UAC_FU_VOLUME: {
387 __le16 value;
388
389 if (req->actual == sizeof(value)) {
390 memcpy(&value, req->buf, sizeof(value));
391 data = le16_to_cpu(value);
392 valid_request = true;
393 }
394 break;
395 }
396 }
397
398 if (valid_request)
399 con->set(con, audio->set_cmd, data);
400 else
401 usb_ep_set_halt(ep);
402
403 audio->set_con = NULL;
404 }
405 break;
406 default:
407 break;
408 }
409 }
410
audio_set_intf_req(struct usb_function * f,const struct usb_ctrlrequest * ctrl)411 static int audio_set_intf_req(struct usb_function *f,
412 const struct usb_ctrlrequest *ctrl)
413 {
414 struct f_audio *audio = func_to_audio(f);
415 struct usb_composite_dev *cdev = f->config->cdev;
416 struct usb_request *req = cdev->req;
417 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
418 u16 len = le16_to_cpu(ctrl->wLength);
419 u16 w_value = le16_to_cpu(ctrl->wValue);
420 u8 con_sel = (w_value >> 8) & 0xFF;
421 u8 cmd = (ctrl->bRequest & 0x0F);
422 struct usb_audio_control_selector *cs;
423 struct usb_audio_control *con;
424
425 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
426 ctrl->bRequest, w_value, len, id);
427
428 list_for_each_entry(cs, &audio->cs, list) {
429 if (cs->id == id) {
430 list_for_each_entry(con, &cs->control, list) {
431 if (con->type == con_sel) {
432 audio->set_con = con;
433 break;
434 }
435 }
436 break;
437 }
438 }
439
440 audio->set_cmd = cmd;
441 req->context = audio;
442 req->complete = f_audio_complete;
443
444 return len;
445 }
446
audio_get_intf_req(struct usb_function * f,const struct usb_ctrlrequest * ctrl)447 static int audio_get_intf_req(struct usb_function *f,
448 const struct usb_ctrlrequest *ctrl)
449 {
450 struct f_audio *audio = func_to_audio(f);
451 struct usb_composite_dev *cdev = f->config->cdev;
452 struct usb_request *req = cdev->req;
453 int value = -EOPNOTSUPP;
454 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
455 u16 len = le16_to_cpu(ctrl->wLength);
456 u16 w_value = le16_to_cpu(ctrl->wValue);
457 u8 con_sel = (w_value >> 8) & 0xFF;
458 u8 cmd = (ctrl->bRequest & 0x0F);
459 struct usb_audio_control_selector *cs;
460 struct usb_audio_control *con;
461
462 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
463 ctrl->bRequest, w_value, len, id);
464
465 list_for_each_entry(cs, &audio->cs, list) {
466 if (cs->id == id) {
467 list_for_each_entry(con, &cs->control, list) {
468 if (con->type == con_sel && con->get) {
469 value = con->get(con, cmd);
470 break;
471 }
472 }
473 break;
474 }
475 }
476
477 req->context = audio;
478 req->complete = f_audio_complete;
479 len = min_t(size_t, sizeof(value), len);
480 memcpy(req->buf, &value, len);
481
482 return len;
483 }
484
audio_set_endpoint_req(struct usb_function * f,const struct usb_ctrlrequest * ctrl)485 static int audio_set_endpoint_req(struct usb_function *f,
486 const struct usb_ctrlrequest *ctrl)
487 {
488 struct usb_composite_dev *cdev = f->config->cdev;
489 int value = -EOPNOTSUPP;
490 u16 ep = le16_to_cpu(ctrl->wIndex);
491 u16 len = le16_to_cpu(ctrl->wLength);
492 u16 w_value = le16_to_cpu(ctrl->wValue);
493
494 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
495 ctrl->bRequest, w_value, len, ep);
496
497 switch (ctrl->bRequest) {
498 case UAC_SET_CUR:
499 value = len;
500 break;
501
502 case UAC_SET_MIN:
503 break;
504
505 case UAC_SET_MAX:
506 break;
507
508 case UAC_SET_RES:
509 break;
510
511 case UAC_SET_MEM:
512 break;
513
514 default:
515 break;
516 }
517
518 return value;
519 }
520
audio_get_endpoint_req(struct usb_function * f,const struct usb_ctrlrequest * ctrl)521 static int audio_get_endpoint_req(struct usb_function *f,
522 const struct usb_ctrlrequest *ctrl)
523 {
524 struct usb_composite_dev *cdev = f->config->cdev;
525 int value = -EOPNOTSUPP;
526 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
527 u16 len = le16_to_cpu(ctrl->wLength);
528 u16 w_value = le16_to_cpu(ctrl->wValue);
529
530 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
531 ctrl->bRequest, w_value, len, ep);
532
533 switch (ctrl->bRequest) {
534 case UAC_GET_CUR:
535 case UAC_GET_MIN:
536 case UAC_GET_MAX:
537 case UAC_GET_RES:
538 value = len;
539 break;
540 case UAC_GET_MEM:
541 break;
542 default:
543 break;
544 }
545
546 return value;
547 }
548
549 static int
f_audio_setup(struct usb_function * f,const struct usb_ctrlrequest * ctrl)550 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
551 {
552 struct usb_composite_dev *cdev = f->config->cdev;
553 struct usb_request *req = cdev->req;
554 int value = -EOPNOTSUPP;
555 u16 w_index = le16_to_cpu(ctrl->wIndex);
556 u16 w_value = le16_to_cpu(ctrl->wValue);
557 u16 w_length = le16_to_cpu(ctrl->wLength);
558
559 /* composite driver infrastructure handles everything; interface
560 * activation uses set_alt().
561 */
562 switch (ctrl->bRequestType) {
563 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
564 value = audio_set_intf_req(f, ctrl);
565 break;
566
567 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
568 value = audio_get_intf_req(f, ctrl);
569 break;
570
571 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
572 value = audio_set_endpoint_req(f, ctrl);
573 break;
574
575 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
576 value = audio_get_endpoint_req(f, ctrl);
577 break;
578
579 default:
580 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
581 ctrl->bRequestType, ctrl->bRequest,
582 w_value, w_index, w_length);
583 }
584
585 /* respond with data transfer or status phase? */
586 if (value >= 0) {
587 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
588 ctrl->bRequestType, ctrl->bRequest,
589 w_value, w_index, w_length);
590 req->zero = 0;
591 req->length = value;
592 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
593 if (value < 0)
594 ERROR(cdev, "audio response on err %d\n", value);
595 }
596
597 /* device either stalls (value < 0) or reports success */
598 return value;
599 }
600
f_audio_set_alt(struct usb_function * f,unsigned intf,unsigned alt)601 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
602 {
603 struct f_audio *audio = func_to_audio(f);
604 struct usb_composite_dev *cdev = f->config->cdev;
605 struct usb_ep *out_ep = audio->out_ep;
606 struct usb_request *req;
607 struct f_uac1_legacy_opts *opts;
608 int req_buf_size, req_count, audio_buf_size;
609 int i = 0, err = 0;
610
611 DBG(cdev, "intf %d, alt %d\n", intf, alt);
612
613 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst);
614 req_buf_size = opts->req_buf_size;
615 req_count = opts->req_count;
616 audio_buf_size = opts->audio_buf_size;
617
618 /* No i/f has more than 2 alt settings */
619 if (alt > 1) {
620 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__);
621 return -EINVAL;
622 }
623
624 if (intf == audio->ac_intf) {
625 /* Control I/f has only 1 AltSetting - 0 */
626 if (alt) {
627 ERROR(cdev, "%s:%d Error!\n", __func__, __LINE__);
628 return -EINVAL;
629 }
630 return 0;
631 } else if (intf == audio->as_intf) {
632 if (alt == 1) {
633 err = config_ep_by_speed(cdev->gadget, f, out_ep);
634 if (err)
635 return err;
636
637 usb_ep_enable(out_ep);
638 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
639 if (IS_ERR(audio->copy_buf))
640 return -ENOMEM;
641
642 /*
643 * allocate a bunch of read buffers
644 * and queue them all at once.
645 */
646 for (i = 0; i < req_count && err == 0; i++) {
647 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
648 if (req) {
649 req->buf = kzalloc(req_buf_size,
650 GFP_ATOMIC);
651 if (req->buf) {
652 req->length = req_buf_size;
653 req->context = audio;
654 req->complete =
655 f_audio_complete;
656 err = usb_ep_queue(out_ep,
657 req, GFP_ATOMIC);
658 if (err)
659 ERROR(cdev,
660 "%s queue req: %d\n",
661 out_ep->name, err);
662 } else
663 err = -ENOMEM;
664 } else
665 err = -ENOMEM;
666 }
667
668 } else {
669 struct f_audio_buf *copy_buf = audio->copy_buf;
670 if (copy_buf) {
671 list_add_tail(©_buf->list,
672 &audio->play_queue);
673 schedule_work(&audio->playback_work);
674 }
675 }
676 audio->as_alt = alt;
677 }
678
679 return err;
680 }
681
f_audio_get_alt(struct usb_function * f,unsigned intf)682 static int f_audio_get_alt(struct usb_function *f, unsigned intf)
683 {
684 struct f_audio *audio = func_to_audio(f);
685 struct usb_composite_dev *cdev = f->config->cdev;
686
687 if (intf == audio->ac_intf)
688 return audio->ac_alt;
689 else if (intf == audio->as_intf)
690 return audio->as_alt;
691 else
692 ERROR(cdev, "%s:%d Invalid Interface %d!\n",
693 __func__, __LINE__, intf);
694
695 return -EINVAL;
696 }
697
f_audio_disable(struct usb_function * f)698 static void f_audio_disable(struct usb_function *f)
699 {
700 return;
701 }
702
703 /*-------------------------------------------------------------------------*/
704
f_audio_build_desc(struct f_audio * audio)705 static void f_audio_build_desc(struct f_audio *audio)
706 {
707 struct gaudio *card = &audio->card;
708 u8 *sam_freq;
709 int rate;
710
711 /* Set channel numbers */
712 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
713 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
714
715 /* Set sample rates */
716 rate = u_audio_get_playback_rate(card);
717 sam_freq = as_type_i_desc.tSamFreq[0];
718 memcpy(sam_freq, &rate, 3);
719
720 /* Todo: Set Sample bits and other parameters */
721
722 return;
723 }
724
725 /* audio function driver setup/binding */
726 static int
f_audio_bind(struct usb_configuration * c,struct usb_function * f)727 f_audio_bind(struct usb_configuration *c, struct usb_function *f)
728 {
729 struct usb_composite_dev *cdev = c->cdev;
730 struct f_audio *audio = func_to_audio(f);
731 struct usb_string *us;
732 int status;
733 struct usb_ep *ep = NULL;
734 struct f_uac1_legacy_opts *audio_opts;
735
736 audio_opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst);
737 audio->card.gadget = c->cdev->gadget;
738 /* set up ASLA audio devices */
739 if (!audio_opts->bound) {
740 status = gaudio_setup(&audio->card);
741 if (status < 0)
742 return status;
743 audio_opts->bound = true;
744 }
745 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
746 if (IS_ERR(us))
747 return PTR_ERR(us);
748 ac_interface_desc.iInterface = us[STR_AC_IF].id;
749 input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id;
750 input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id;
751 feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id;
752 output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id;
753 as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id;
754 as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id;
755
756
757 f_audio_build_desc(audio);
758
759 /* allocate instance-specific interface IDs, and patch descriptors */
760 status = usb_interface_id(c, f);
761 if (status < 0)
762 goto fail;
763 ac_interface_desc.bInterfaceNumber = status;
764 audio->ac_intf = status;
765 audio->ac_alt = 0;
766
767 status = usb_interface_id(c, f);
768 if (status < 0)
769 goto fail;
770 as_interface_alt_0_desc.bInterfaceNumber = status;
771 as_interface_alt_1_desc.bInterfaceNumber = status;
772 audio->as_intf = status;
773 audio->as_alt = 0;
774
775 status = -ENODEV;
776
777 /* allocate instance-specific endpoints */
778 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
779 if (!ep)
780 goto fail;
781 audio->out_ep = ep;
782 audio->out_ep->desc = &as_out_ep_desc;
783
784 /* copy descriptors, and track endpoint copies */
785 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
786 NULL);
787 if (status)
788 goto fail;
789 return 0;
790
791 fail:
792 gaudio_cleanup(&audio->card);
793 return status;
794 }
795
796 /*-------------------------------------------------------------------------*/
797
generic_set_cmd(struct usb_audio_control * con,u8 cmd,int value)798 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
799 {
800 con->data[cmd] = value;
801
802 return 0;
803 }
804
generic_get_cmd(struct usb_audio_control * con,u8 cmd)805 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
806 {
807 return con->data[cmd];
808 }
809
810 /* Todo: add more control selecotor dynamically */
control_selector_init(struct f_audio * audio)811 static int control_selector_init(struct f_audio *audio)
812 {
813 INIT_LIST_HEAD(&audio->cs);
814 list_add(&feature_unit.list, &audio->cs);
815
816 INIT_LIST_HEAD(&feature_unit.control);
817 list_add(&mute_control.list, &feature_unit.control);
818 list_add(&volume_control.list, &feature_unit.control);
819
820 volume_control.data[UAC__CUR] = 0xffc0;
821 volume_control.data[UAC__MIN] = 0xe3a0;
822 volume_control.data[UAC__MAX] = 0xfff0;
823 volume_control.data[UAC__RES] = 0x0030;
824
825 return 0;
826 }
827
828 static inline
to_f_uac1_opts(struct config_item * item)829 struct f_uac1_legacy_opts *to_f_uac1_opts(struct config_item *item)
830 {
831 return container_of(to_config_group(item), struct f_uac1_legacy_opts,
832 func_inst.group);
833 }
834
f_uac1_attr_release(struct config_item * item)835 static void f_uac1_attr_release(struct config_item *item)
836 {
837 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item);
838
839 usb_put_function_instance(&opts->func_inst);
840 }
841
842 static const struct configfs_item_operations f_uac1_item_ops = {
843 .release = f_uac1_attr_release,
844 };
845
846 #define UAC1_INT_ATTRIBUTE(name) \
847 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
848 char *page) \
849 { \
850 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
851 int result; \
852 \
853 mutex_lock(&opts->lock); \
854 result = sprintf(page, "%u\n", opts->name); \
855 mutex_unlock(&opts->lock); \
856 \
857 return result; \
858 } \
859 \
860 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
861 const char *page, size_t len) \
862 { \
863 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
864 int ret; \
865 u32 num; \
866 \
867 mutex_lock(&opts->lock); \
868 if (opts->refcnt) { \
869 ret = -EBUSY; \
870 goto end; \
871 } \
872 \
873 ret = kstrtou32(page, 0, &num); \
874 if (ret) \
875 goto end; \
876 \
877 opts->name = num; \
878 ret = len; \
879 \
880 end: \
881 mutex_unlock(&opts->lock); \
882 return ret; \
883 } \
884 \
885 CONFIGFS_ATTR(f_uac1_opts_, name)
886
887 UAC1_INT_ATTRIBUTE(req_buf_size);
888 UAC1_INT_ATTRIBUTE(req_count);
889 UAC1_INT_ATTRIBUTE(audio_buf_size);
890
891 #define UAC1_STR_ATTRIBUTE(name) \
892 static ssize_t f_uac1_opts_##name##_show(struct config_item *item, \
893 char *page) \
894 { \
895 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
896 int result; \
897 \
898 mutex_lock(&opts->lock); \
899 result = sprintf(page, "%s\n", opts->name); \
900 mutex_unlock(&opts->lock); \
901 \
902 return result; \
903 } \
904 \
905 static ssize_t f_uac1_opts_##name##_store(struct config_item *item, \
906 const char *page, size_t len) \
907 { \
908 struct f_uac1_legacy_opts *opts = to_f_uac1_opts(item); \
909 int ret = -EBUSY; \
910 char *tmp; \
911 \
912 mutex_lock(&opts->lock); \
913 if (opts->refcnt) \
914 goto end; \
915 \
916 tmp = kstrndup(page, len, GFP_KERNEL); \
917 if (tmp) { \
918 ret = -ENOMEM; \
919 goto end; \
920 } \
921 if (opts->name##_alloc) \
922 kfree(opts->name); \
923 opts->name##_alloc = true; \
924 opts->name = tmp; \
925 ret = len; \
926 \
927 end: \
928 mutex_unlock(&opts->lock); \
929 return ret; \
930 } \
931 \
932 CONFIGFS_ATTR(f_uac1_opts_, name)
933
934 UAC1_STR_ATTRIBUTE(fn_play);
935 UAC1_STR_ATTRIBUTE(fn_cap);
936 UAC1_STR_ATTRIBUTE(fn_cntl);
937
938 static struct configfs_attribute *f_uac1_attrs[] = {
939 &f_uac1_opts_attr_req_buf_size,
940 &f_uac1_opts_attr_req_count,
941 &f_uac1_opts_attr_audio_buf_size,
942 &f_uac1_opts_attr_fn_play,
943 &f_uac1_opts_attr_fn_cap,
944 &f_uac1_opts_attr_fn_cntl,
945 NULL,
946 };
947
948 static const struct config_item_type f_uac1_func_type = {
949 .ct_item_ops = &f_uac1_item_ops,
950 .ct_attrs = f_uac1_attrs,
951 .ct_owner = THIS_MODULE,
952 };
953
f_audio_free_inst(struct usb_function_instance * f)954 static void f_audio_free_inst(struct usb_function_instance *f)
955 {
956 struct f_uac1_legacy_opts *opts;
957
958 opts = container_of(f, struct f_uac1_legacy_opts, func_inst);
959 if (opts->fn_play_alloc)
960 kfree(opts->fn_play);
961 if (opts->fn_cap_alloc)
962 kfree(opts->fn_cap);
963 if (opts->fn_cntl_alloc)
964 kfree(opts->fn_cntl);
965 kfree(opts);
966 }
967
f_audio_alloc_inst(void)968 static struct usb_function_instance *f_audio_alloc_inst(void)
969 {
970 struct f_uac1_legacy_opts *opts;
971
972 opts = kzalloc_obj(*opts);
973 if (!opts)
974 return ERR_PTR(-ENOMEM);
975
976 mutex_init(&opts->lock);
977 opts->func_inst.free_func_inst = f_audio_free_inst;
978
979 config_group_init_type_name(&opts->func_inst.group, "",
980 &f_uac1_func_type);
981
982 opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
983 opts->req_count = UAC1_REQ_COUNT;
984 opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE;
985 opts->fn_play = FILE_PCM_PLAYBACK;
986 opts->fn_cap = FILE_PCM_CAPTURE;
987 opts->fn_cntl = FILE_CONTROL;
988 return &opts->func_inst;
989 }
990
f_audio_free(struct usb_function * f)991 static void f_audio_free(struct usb_function *f)
992 {
993 struct f_audio *audio = func_to_audio(f);
994 struct f_uac1_legacy_opts *opts;
995
996 gaudio_cleanup(&audio->card);
997 opts = container_of(f->fi, struct f_uac1_legacy_opts, func_inst);
998 kfree(audio);
999 mutex_lock(&opts->lock);
1000 --opts->refcnt;
1001 mutex_unlock(&opts->lock);
1002 }
1003
f_audio_unbind(struct usb_configuration * c,struct usb_function * f)1004 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
1005 {
1006 usb_free_all_descriptors(f);
1007 }
1008
f_audio_alloc(struct usb_function_instance * fi)1009 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
1010 {
1011 struct f_audio *audio;
1012 struct f_uac1_legacy_opts *opts;
1013
1014 /* allocate and initialize one new instance */
1015 audio = kzalloc_obj(*audio);
1016 if (!audio)
1017 return ERR_PTR(-ENOMEM);
1018
1019 audio->card.func.name = "g_audio";
1020
1021 opts = container_of(fi, struct f_uac1_legacy_opts, func_inst);
1022 mutex_lock(&opts->lock);
1023 ++opts->refcnt;
1024 mutex_unlock(&opts->lock);
1025 INIT_LIST_HEAD(&audio->play_queue);
1026 spin_lock_init(&audio->lock);
1027
1028 audio->card.func.bind = f_audio_bind;
1029 audio->card.func.unbind = f_audio_unbind;
1030 audio->card.func.set_alt = f_audio_set_alt;
1031 audio->card.func.get_alt = f_audio_get_alt;
1032 audio->card.func.setup = f_audio_setup;
1033 audio->card.func.disable = f_audio_disable;
1034 audio->card.func.free_func = f_audio_free;
1035
1036 control_selector_init(audio);
1037
1038 INIT_WORK(&audio->playback_work, f_audio_playback_work);
1039
1040 return &audio->card.func;
1041 }
1042
1043 DECLARE_USB_FUNCTION_INIT(uac1_legacy, f_audio_alloc_inst, f_audio_alloc);
1044 MODULE_DESCRIPTION("USB Audio class function driver");
1045 MODULE_LICENSE("GPL");
1046 MODULE_AUTHOR("Bryan Wu");
1047