1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * u_audio.c -- interface to USB gadget "ALSA sound card" utilities
4 *
5 * Copyright (C) 2016
6 * Author: Ruslan Bilovol <ruslan.bilovol@gmail.com>
7 *
8 * Sound card implementation was cut-and-pasted with changes
9 * from f_uac2.c and has:
10 * Copyright (C) 2011
11 * Yadwinder Singh (yadi.brar01@gmail.com)
12 * Jaswinder Singh (jaswinder.singh@linaro.org)
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/control.h>
21 #include <sound/tlv.h>
22 #include <linux/usb/audio.h>
23
24 #include "u_audio.h"
25
26 #define BUFF_SIZE_MAX (PAGE_SIZE * 16)
27 #define PRD_SIZE_MAX PAGE_SIZE
28 #define MIN_PERIODS 4
29
30 enum {
31 UAC_FBACK_CTRL,
32 UAC_MUTE_CTRL,
33 UAC_VOLUME_CTRL,
34 };
35
36 /* Runtime data params for one stream */
37 struct uac_rtd_params {
38 struct snd_uac_chip *uac; /* parent chip */
39 bool ep_enabled; /* if the ep is enabled */
40
41 struct snd_pcm_substream *ss;
42
43 /* Ring buffer */
44 ssize_t hw_ptr;
45
46 void *rbuf;
47
48 unsigned int pitch; /* Stream pitch ratio to 1000000 */
49 unsigned int max_psize; /* MaxPacketSize of endpoint */
50
51 struct usb_request **reqs;
52
53 struct usb_request *req_fback; /* Feedback endpoint request */
54 bool fb_ep_enabled; /* if the ep is enabled */
55
56 /* Volume/Mute controls and their state */
57 int fu_id; /* Feature Unit ID */
58 struct snd_kcontrol *snd_kctl_volume;
59 struct snd_kcontrol *snd_kctl_mute;
60 s16 volume_min, volume_max, volume_res;
61 s16 volume;
62 int mute;
63
64 spinlock_t lock; /* lock for control transfers */
65
66 };
67
68 struct snd_uac_chip {
69 struct g_audio *audio_dev;
70
71 struct uac_rtd_params p_prm;
72 struct uac_rtd_params c_prm;
73
74 struct snd_card *card;
75 struct snd_pcm *pcm;
76
77 /* timekeeping for the playback endpoint */
78 unsigned int p_interval;
79 unsigned int p_residue;
80
81 /* pre-calculated values for playback iso completion */
82 unsigned int p_pktsize;
83 unsigned int p_pktsize_residue;
84 unsigned int p_framesize;
85 };
86
87 static const struct snd_pcm_hardware uac_pcm_hardware = {
88 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER
89 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
90 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
91 .rates = SNDRV_PCM_RATE_CONTINUOUS,
92 .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX,
93 .buffer_bytes_max = BUFF_SIZE_MAX,
94 .period_bytes_max = PRD_SIZE_MAX,
95 .periods_min = MIN_PERIODS,
96 };
97
u_audio_set_fback_frequency(enum usb_device_speed speed,struct usb_ep * out_ep,unsigned long long freq,unsigned int pitch,void * buf)98 static void u_audio_set_fback_frequency(enum usb_device_speed speed,
99 struct usb_ep *out_ep,
100 unsigned long long freq,
101 unsigned int pitch,
102 void *buf)
103 {
104 u32 ff = 0;
105 const struct usb_endpoint_descriptor *ep_desc;
106
107 /*
108 * Because the pitch base is 1000000, the final divider here
109 * will be 1000 * 1000000 = 1953125 << 9
110 *
111 * Instead of dealing with big numbers lets fold this 9 left shift
112 */
113
114 if (speed == USB_SPEED_FULL) {
115 /*
116 * Full-speed feedback endpoints report frequency
117 * in samples/frame
118 * Format is encoded in Q10.10 left-justified in the 24 bits,
119 * so that it has a Q10.14 format.
120 *
121 * ff = (freq << 14) / 1000
122 */
123 freq <<= 5;
124 } else {
125 /*
126 * High-speed feedback endpoints report frequency
127 * in samples/microframe.
128 * Format is encoded in Q12.13 fitted into four bytes so that
129 * the binary point is located between the second and the third
130 * byte fromat (that is Q16.16)
131 *
132 * ff = (freq << 16) / 8000
133 *
134 * Win10 and OSX UAC2 drivers require number of samples per packet
135 * in order to honor the feedback value.
136 * Linux snd-usb-audio detects the applied bit-shift automatically.
137 */
138 ep_desc = out_ep->desc;
139 freq <<= 4 + (ep_desc->bInterval - 1);
140 }
141
142 ff = DIV_ROUND_CLOSEST_ULL((freq * pitch), 1953125);
143
144 *(__le32 *)buf = cpu_to_le32(ff);
145 }
146
u_audio_iso_complete(struct usb_ep * ep,struct usb_request * req)147 static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req)
148 {
149 unsigned int pending;
150 unsigned int hw_ptr;
151 int status = req->status;
152 struct snd_pcm_substream *substream;
153 struct snd_pcm_runtime *runtime;
154 struct uac_rtd_params *prm = req->context;
155 struct snd_uac_chip *uac = prm->uac;
156
157 /* i/f shutting down */
158 if (!prm->ep_enabled) {
159 usb_ep_free_request(ep, req);
160 return;
161 }
162
163 if (req->status == -ESHUTDOWN)
164 return;
165
166 /*
167 * We can't really do much about bad xfers.
168 * Afterall, the ISOCH xfers could fail legitimately.
169 */
170 if (status)
171 pr_debug("%s: iso_complete status(%d) %d/%d\n",
172 __func__, status, req->actual, req->length);
173
174 substream = prm->ss;
175
176 /* Do nothing if ALSA isn't active */
177 if (!substream)
178 goto exit;
179
180 snd_pcm_stream_lock(substream);
181
182 runtime = substream->runtime;
183 if (!runtime || !snd_pcm_running(substream)) {
184 snd_pcm_stream_unlock(substream);
185 goto exit;
186 }
187
188 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
189 /*
190 * For each IN packet, take the quotient of the current data
191 * rate and the endpoint's interval as the base packet size.
192 * If there is a residue from this division, add it to the
193 * residue accumulator.
194 */
195 req->length = uac->p_pktsize;
196 uac->p_residue += uac->p_pktsize_residue;
197
198 /*
199 * Whenever there are more bytes in the accumulator than we
200 * need to add one more sample frame, increase this packet's
201 * size and decrease the accumulator.
202 */
203 if (uac->p_residue / uac->p_interval >= uac->p_framesize) {
204 req->length += uac->p_framesize;
205 uac->p_residue -= uac->p_framesize *
206 uac->p_interval;
207 }
208
209 req->actual = req->length;
210 }
211
212 hw_ptr = prm->hw_ptr;
213
214 /* Pack USB load in ALSA ring buffer */
215 pending = runtime->dma_bytes - hw_ptr;
216
217 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
218 if (unlikely(pending < req->actual)) {
219 memcpy(req->buf, runtime->dma_area + hw_ptr, pending);
220 memcpy(req->buf + pending, runtime->dma_area,
221 req->actual - pending);
222 } else {
223 memcpy(req->buf, runtime->dma_area + hw_ptr,
224 req->actual);
225 }
226 } else {
227 if (unlikely(pending < req->actual)) {
228 memcpy(runtime->dma_area + hw_ptr, req->buf, pending);
229 memcpy(runtime->dma_area, req->buf + pending,
230 req->actual - pending);
231 } else {
232 memcpy(runtime->dma_area + hw_ptr, req->buf,
233 req->actual);
234 }
235 }
236
237 /* update hw_ptr after data is copied to memory */
238 prm->hw_ptr = (hw_ptr + req->actual) % runtime->dma_bytes;
239 hw_ptr = prm->hw_ptr;
240 snd_pcm_stream_unlock(substream);
241
242 if ((hw_ptr % snd_pcm_lib_period_bytes(substream)) < req->actual)
243 snd_pcm_period_elapsed(substream);
244
245 exit:
246 if (usb_ep_queue(ep, req, GFP_ATOMIC))
247 dev_err(uac->card->dev, "%d Error!\n", __LINE__);
248 }
249
u_audio_iso_fback_complete(struct usb_ep * ep,struct usb_request * req)250 static void u_audio_iso_fback_complete(struct usb_ep *ep,
251 struct usb_request *req)
252 {
253 struct uac_rtd_params *prm = req->context;
254 struct snd_uac_chip *uac = prm->uac;
255 struct g_audio *audio_dev = uac->audio_dev;
256 struct uac_params *params = &audio_dev->params;
257 int status = req->status;
258
259 /* i/f shutting down */
260 if (!prm->fb_ep_enabled) {
261 kfree(req->buf);
262 usb_ep_free_request(ep, req);
263 return;
264 }
265
266 if (req->status == -ESHUTDOWN)
267 return;
268
269 /*
270 * We can't really do much about bad xfers.
271 * Afterall, the ISOCH xfers could fail legitimately.
272 */
273 if (status)
274 pr_debug("%s: iso_complete status(%d) %d/%d\n",
275 __func__, status, req->actual, req->length);
276
277 u_audio_set_fback_frequency(audio_dev->gadget->speed, audio_dev->out_ep,
278 params->c_srate, prm->pitch,
279 req->buf);
280
281 if (usb_ep_queue(ep, req, GFP_ATOMIC))
282 dev_err(uac->card->dev, "%d Error!\n", __LINE__);
283 }
284
uac_pcm_trigger(struct snd_pcm_substream * substream,int cmd)285 static int uac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
286 {
287 struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
288 struct uac_rtd_params *prm;
289 struct g_audio *audio_dev;
290 struct uac_params *params;
291 int err = 0;
292
293 audio_dev = uac->audio_dev;
294 params = &audio_dev->params;
295
296 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
297 prm = &uac->p_prm;
298 else
299 prm = &uac->c_prm;
300
301 /* Reset */
302 prm->hw_ptr = 0;
303
304 switch (cmd) {
305 case SNDRV_PCM_TRIGGER_START:
306 case SNDRV_PCM_TRIGGER_RESUME:
307 prm->ss = substream;
308 break;
309 case SNDRV_PCM_TRIGGER_STOP:
310 case SNDRV_PCM_TRIGGER_SUSPEND:
311 prm->ss = NULL;
312 break;
313 default:
314 err = -EINVAL;
315 }
316
317 /* Clear buffer after Play stops */
318 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
319 memset(prm->rbuf, 0, prm->max_psize * params->req_number);
320
321 return err;
322 }
323
uac_pcm_pointer(struct snd_pcm_substream * substream)324 static snd_pcm_uframes_t uac_pcm_pointer(struct snd_pcm_substream *substream)
325 {
326 struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
327 struct uac_rtd_params *prm;
328
329 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
330 prm = &uac->p_prm;
331 else
332 prm = &uac->c_prm;
333
334 return bytes_to_frames(substream->runtime, prm->hw_ptr);
335 }
336
uac_ssize_to_fmt(int ssize)337 static u64 uac_ssize_to_fmt(int ssize)
338 {
339 u64 ret;
340
341 switch (ssize) {
342 case 3:
343 ret = SNDRV_PCM_FMTBIT_S24_3LE;
344 break;
345 case 4:
346 ret = SNDRV_PCM_FMTBIT_S32_LE;
347 break;
348 default:
349 ret = SNDRV_PCM_FMTBIT_S16_LE;
350 break;
351 }
352
353 return ret;
354 }
355
uac_pcm_open(struct snd_pcm_substream * substream)356 static int uac_pcm_open(struct snd_pcm_substream *substream)
357 {
358 struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
359 struct snd_pcm_runtime *runtime = substream->runtime;
360 struct g_audio *audio_dev;
361 struct uac_params *params;
362 int p_ssize, c_ssize;
363 int p_srate, c_srate;
364 int p_chmask, c_chmask;
365
366 audio_dev = uac->audio_dev;
367 params = &audio_dev->params;
368 p_ssize = params->p_ssize;
369 c_ssize = params->c_ssize;
370 p_srate = params->p_srate;
371 c_srate = params->c_srate;
372 p_chmask = params->p_chmask;
373 c_chmask = params->c_chmask;
374 uac->p_residue = 0;
375
376 runtime->hw = uac_pcm_hardware;
377
378 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
379 runtime->hw.rate_min = p_srate;
380 runtime->hw.formats = uac_ssize_to_fmt(p_ssize);
381 runtime->hw.channels_min = num_channels(p_chmask);
382 runtime->hw.period_bytes_min = 2 * uac->p_prm.max_psize
383 / runtime->hw.periods_min;
384 } else {
385 runtime->hw.rate_min = c_srate;
386 runtime->hw.formats = uac_ssize_to_fmt(c_ssize);
387 runtime->hw.channels_min = num_channels(c_chmask);
388 runtime->hw.period_bytes_min = 2 * uac->c_prm.max_psize
389 / runtime->hw.periods_min;
390 }
391
392 runtime->hw.rate_max = runtime->hw.rate_min;
393 runtime->hw.channels_max = runtime->hw.channels_min;
394
395 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
396
397 return 0;
398 }
399
400 /* ALSA cries without these function pointers */
uac_pcm_null(struct snd_pcm_substream * substream)401 static int uac_pcm_null(struct snd_pcm_substream *substream)
402 {
403 return 0;
404 }
405
406 static const struct snd_pcm_ops uac_pcm_ops = {
407 .open = uac_pcm_open,
408 .close = uac_pcm_null,
409 .trigger = uac_pcm_trigger,
410 .pointer = uac_pcm_pointer,
411 .prepare = uac_pcm_null,
412 };
413
free_ep(struct uac_rtd_params * prm,struct usb_ep * ep)414 static inline void free_ep(struct uac_rtd_params *prm, struct usb_ep *ep)
415 {
416 struct snd_uac_chip *uac = prm->uac;
417 struct g_audio *audio_dev;
418 struct uac_params *params;
419 int i;
420
421 if (!prm->ep_enabled)
422 return;
423
424 audio_dev = uac->audio_dev;
425 params = &audio_dev->params;
426
427 for (i = 0; i < params->req_number; i++) {
428 if (prm->reqs[i]) {
429 if (usb_ep_dequeue(ep, prm->reqs[i]))
430 usb_ep_free_request(ep, prm->reqs[i]);
431 /*
432 * If usb_ep_dequeue() cannot successfully dequeue the
433 * request, the request will be freed by the completion
434 * callback.
435 */
436
437 prm->reqs[i] = NULL;
438 }
439 }
440
441 prm->ep_enabled = false;
442
443 if (usb_ep_disable(ep))
444 dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__);
445 }
446
free_ep_fback(struct uac_rtd_params * prm,struct usb_ep * ep)447 static inline void free_ep_fback(struct uac_rtd_params *prm, struct usb_ep *ep)
448 {
449 struct snd_uac_chip *uac = prm->uac;
450
451 if (!prm->fb_ep_enabled)
452 return;
453
454 if (prm->req_fback) {
455 if (usb_ep_dequeue(ep, prm->req_fback)) {
456 kfree(prm->req_fback->buf);
457 usb_ep_free_request(ep, prm->req_fback);
458 }
459 prm->req_fback = NULL;
460 }
461
462 prm->fb_ep_enabled = false;
463
464 if (usb_ep_disable(ep))
465 dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__);
466 }
467
u_audio_start_capture(struct g_audio * audio_dev)468 int u_audio_start_capture(struct g_audio *audio_dev)
469 {
470 struct snd_uac_chip *uac = audio_dev->uac;
471 struct usb_gadget *gadget = audio_dev->gadget;
472 struct device *dev = &gadget->dev;
473 struct usb_request *req, *req_fback;
474 struct usb_ep *ep, *ep_fback;
475 struct uac_rtd_params *prm;
476 struct uac_params *params = &audio_dev->params;
477 int req_len, i;
478
479 ep = audio_dev->out_ep;
480 prm = &uac->c_prm;
481 config_ep_by_speed(gadget, &audio_dev->func, ep);
482 req_len = ep->maxpacket;
483
484 prm->ep_enabled = true;
485 usb_ep_enable(ep);
486
487 for (i = 0; i < params->req_number; i++) {
488 if (!prm->reqs[i]) {
489 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
490 if (req == NULL)
491 return -ENOMEM;
492
493 prm->reqs[i] = req;
494
495 req->zero = 0;
496 req->context = prm;
497 req->length = req_len;
498 req->complete = u_audio_iso_complete;
499 req->buf = prm->rbuf + i * ep->maxpacket;
500 }
501
502 if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC))
503 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
504 }
505
506 ep_fback = audio_dev->in_ep_fback;
507 if (!ep_fback)
508 return 0;
509
510 /* Setup feedback endpoint */
511 config_ep_by_speed(gadget, &audio_dev->func, ep_fback);
512 prm->fb_ep_enabled = true;
513 usb_ep_enable(ep_fback);
514 req_len = ep_fback->maxpacket;
515
516 req_fback = usb_ep_alloc_request(ep_fback, GFP_ATOMIC);
517 if (req_fback == NULL)
518 return -ENOMEM;
519
520 prm->req_fback = req_fback;
521 req_fback->zero = 0;
522 req_fback->context = prm;
523 req_fback->length = req_len;
524 req_fback->complete = u_audio_iso_fback_complete;
525
526 req_fback->buf = kzalloc(req_len, GFP_ATOMIC);
527 if (!req_fback->buf)
528 return -ENOMEM;
529
530 /*
531 * Configure the feedback endpoint's reported frequency.
532 * Always start with original frequency since its deviation can't
533 * be meauserd at start of playback
534 */
535 prm->pitch = 1000000;
536 u_audio_set_fback_frequency(audio_dev->gadget->speed, ep,
537 params->c_srate, prm->pitch,
538 req_fback->buf);
539
540 if (usb_ep_queue(ep_fback, req_fback, GFP_ATOMIC))
541 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
542
543 return 0;
544 }
545 EXPORT_SYMBOL_GPL(u_audio_start_capture);
546
u_audio_stop_capture(struct g_audio * audio_dev)547 void u_audio_stop_capture(struct g_audio *audio_dev)
548 {
549 struct snd_uac_chip *uac = audio_dev->uac;
550
551 if (audio_dev->in_ep_fback)
552 free_ep_fback(&uac->c_prm, audio_dev->in_ep_fback);
553 free_ep(&uac->c_prm, audio_dev->out_ep);
554 }
555 EXPORT_SYMBOL_GPL(u_audio_stop_capture);
556
u_audio_start_playback(struct g_audio * audio_dev)557 int u_audio_start_playback(struct g_audio *audio_dev)
558 {
559 struct snd_uac_chip *uac = audio_dev->uac;
560 struct usb_gadget *gadget = audio_dev->gadget;
561 struct device *dev = &gadget->dev;
562 struct usb_request *req;
563 struct usb_ep *ep;
564 struct uac_rtd_params *prm;
565 struct uac_params *params = &audio_dev->params;
566 unsigned int factor;
567 const struct usb_endpoint_descriptor *ep_desc;
568 int req_len, i;
569
570 ep = audio_dev->in_ep;
571 prm = &uac->p_prm;
572 config_ep_by_speed(gadget, &audio_dev->func, ep);
573
574 ep_desc = ep->desc;
575
576 /* pre-calculate the playback endpoint's interval */
577 if (gadget->speed == USB_SPEED_FULL)
578 factor = 1000;
579 else
580 factor = 8000;
581
582 /* pre-compute some values for iso_complete() */
583 uac->p_framesize = params->p_ssize *
584 num_channels(params->p_chmask);
585 uac->p_interval = factor / (1 << (ep_desc->bInterval - 1));
586 uac->p_pktsize = min_t(unsigned int,
587 uac->p_framesize *
588 (params->p_srate / uac->p_interval),
589 ep->maxpacket);
590
591 if (uac->p_pktsize < ep->maxpacket)
592 uac->p_pktsize_residue = uac->p_framesize *
593 (params->p_srate % uac->p_interval);
594 else
595 uac->p_pktsize_residue = 0;
596
597 req_len = uac->p_pktsize;
598 uac->p_residue = 0;
599
600 prm->ep_enabled = true;
601 usb_ep_enable(ep);
602
603 for (i = 0; i < params->req_number; i++) {
604 if (!prm->reqs[i]) {
605 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
606 if (req == NULL)
607 return -ENOMEM;
608
609 prm->reqs[i] = req;
610
611 req->zero = 0;
612 req->context = prm;
613 req->length = req_len;
614 req->complete = u_audio_iso_complete;
615 req->buf = prm->rbuf + i * ep->maxpacket;
616 }
617
618 if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC))
619 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
620 }
621
622 return 0;
623 }
624 EXPORT_SYMBOL_GPL(u_audio_start_playback);
625
u_audio_stop_playback(struct g_audio * audio_dev)626 void u_audio_stop_playback(struct g_audio *audio_dev)
627 {
628 struct snd_uac_chip *uac = audio_dev->uac;
629
630 free_ep(&uac->p_prm, audio_dev->in_ep);
631 }
632 EXPORT_SYMBOL_GPL(u_audio_stop_playback);
633
u_audio_get_volume(struct g_audio * audio_dev,int playback,s16 * val)634 int u_audio_get_volume(struct g_audio *audio_dev, int playback, s16 *val)
635 {
636 struct snd_uac_chip *uac = audio_dev->uac;
637 struct uac_rtd_params *prm;
638 unsigned long flags;
639
640 if (playback)
641 prm = &uac->p_prm;
642 else
643 prm = &uac->c_prm;
644
645 spin_lock_irqsave(&prm->lock, flags);
646 *val = prm->volume;
647 spin_unlock_irqrestore(&prm->lock, flags);
648
649 return 0;
650 }
651 EXPORT_SYMBOL_GPL(u_audio_get_volume);
652
u_audio_set_volume(struct g_audio * audio_dev,int playback,s16 val)653 int u_audio_set_volume(struct g_audio *audio_dev, int playback, s16 val)
654 {
655 struct snd_uac_chip *uac = audio_dev->uac;
656 struct uac_rtd_params *prm;
657 unsigned long flags;
658 int change = 0;
659
660 if (playback)
661 prm = &uac->p_prm;
662 else
663 prm = &uac->c_prm;
664
665 spin_lock_irqsave(&prm->lock, flags);
666 val = clamp(val, prm->volume_min, prm->volume_max);
667 if (prm->volume != val) {
668 prm->volume = val;
669 change = 1;
670 }
671 spin_unlock_irqrestore(&prm->lock, flags);
672
673 if (change)
674 snd_ctl_notify(uac->card, SNDRV_CTL_EVENT_MASK_VALUE,
675 &prm->snd_kctl_volume->id);
676
677 return 0;
678 }
679 EXPORT_SYMBOL_GPL(u_audio_set_volume);
680
u_audio_get_mute(struct g_audio * audio_dev,int playback,int * val)681 int u_audio_get_mute(struct g_audio *audio_dev, int playback, int *val)
682 {
683 struct snd_uac_chip *uac = audio_dev->uac;
684 struct uac_rtd_params *prm;
685 unsigned long flags;
686
687 if (playback)
688 prm = &uac->p_prm;
689 else
690 prm = &uac->c_prm;
691
692 spin_lock_irqsave(&prm->lock, flags);
693 *val = prm->mute;
694 spin_unlock_irqrestore(&prm->lock, flags);
695
696 return 0;
697 }
698 EXPORT_SYMBOL_GPL(u_audio_get_mute);
699
u_audio_set_mute(struct g_audio * audio_dev,int playback,int val)700 int u_audio_set_mute(struct g_audio *audio_dev, int playback, int val)
701 {
702 struct snd_uac_chip *uac = audio_dev->uac;
703 struct uac_rtd_params *prm;
704 unsigned long flags;
705 int change = 0;
706 int mute;
707
708 if (playback)
709 prm = &uac->p_prm;
710 else
711 prm = &uac->c_prm;
712
713 mute = val ? 1 : 0;
714
715 spin_lock_irqsave(&prm->lock, flags);
716 if (prm->mute != mute) {
717 prm->mute = mute;
718 change = 1;
719 }
720 spin_unlock_irqrestore(&prm->lock, flags);
721
722 if (change)
723 snd_ctl_notify(uac->card, SNDRV_CTL_EVENT_MASK_VALUE,
724 &prm->snd_kctl_mute->id);
725
726 return 0;
727 }
728 EXPORT_SYMBOL_GPL(u_audio_set_mute);
729
730
u_audio_pitch_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)731 static int u_audio_pitch_info(struct snd_kcontrol *kcontrol,
732 struct snd_ctl_elem_info *uinfo)
733 {
734 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
735 struct snd_uac_chip *uac = prm->uac;
736 struct g_audio *audio_dev = uac->audio_dev;
737 struct uac_params *params = &audio_dev->params;
738 unsigned int pitch_min, pitch_max;
739
740 pitch_min = (1000 - FBACK_SLOW_MAX) * 1000;
741 pitch_max = (1000 + params->fb_max) * 1000;
742
743 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
744 uinfo->count = 1;
745 uinfo->value.integer.min = pitch_min;
746 uinfo->value.integer.max = pitch_max;
747 uinfo->value.integer.step = 1;
748 return 0;
749 }
750
u_audio_pitch_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)751 static int u_audio_pitch_get(struct snd_kcontrol *kcontrol,
752 struct snd_ctl_elem_value *ucontrol)
753 {
754 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
755
756 ucontrol->value.integer.value[0] = prm->pitch;
757
758 return 0;
759 }
760
u_audio_pitch_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)761 static int u_audio_pitch_put(struct snd_kcontrol *kcontrol,
762 struct snd_ctl_elem_value *ucontrol)
763 {
764 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
765 struct snd_uac_chip *uac = prm->uac;
766 struct g_audio *audio_dev = uac->audio_dev;
767 struct uac_params *params = &audio_dev->params;
768 unsigned int val;
769 unsigned int pitch_min, pitch_max;
770 int change = 0;
771
772 pitch_min = (1000 - FBACK_SLOW_MAX) * 1000;
773 pitch_max = (1000 + params->fb_max) * 1000;
774
775 val = ucontrol->value.integer.value[0];
776
777 if (val < pitch_min)
778 val = pitch_min;
779 if (val > pitch_max)
780 val = pitch_max;
781
782 if (prm->pitch != val) {
783 prm->pitch = val;
784 change = 1;
785 }
786
787 return change;
788 }
789
u_audio_mute_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)790 static int u_audio_mute_info(struct snd_kcontrol *kcontrol,
791 struct snd_ctl_elem_info *uinfo)
792 {
793 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
794 uinfo->count = 1;
795 uinfo->value.integer.min = 0;
796 uinfo->value.integer.max = 1;
797 uinfo->value.integer.step = 1;
798
799 return 0;
800 }
801
u_audio_mute_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)802 static int u_audio_mute_get(struct snd_kcontrol *kcontrol,
803 struct snd_ctl_elem_value *ucontrol)
804 {
805 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
806 unsigned long flags;
807
808 spin_lock_irqsave(&prm->lock, flags);
809 ucontrol->value.integer.value[0] = !prm->mute;
810 spin_unlock_irqrestore(&prm->lock, flags);
811
812 return 0;
813 }
814
u_audio_mute_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)815 static int u_audio_mute_put(struct snd_kcontrol *kcontrol,
816 struct snd_ctl_elem_value *ucontrol)
817 {
818 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
819 struct snd_uac_chip *uac = prm->uac;
820 struct g_audio *audio_dev = uac->audio_dev;
821 unsigned int val;
822 unsigned long flags;
823 int change = 0;
824
825 val = !ucontrol->value.integer.value[0];
826
827 spin_lock_irqsave(&prm->lock, flags);
828 if (val != prm->mute) {
829 prm->mute = val;
830 change = 1;
831 }
832 spin_unlock_irqrestore(&prm->lock, flags);
833
834 if (change && audio_dev->notify)
835 audio_dev->notify(audio_dev, prm->fu_id, UAC_FU_MUTE);
836
837 return change;
838 }
839
840 /*
841 * TLV callback for mixer volume controls
842 */
u_audio_volume_tlv(struct snd_kcontrol * kcontrol,int op_flag,unsigned int size,unsigned int __user * _tlv)843 static int u_audio_volume_tlv(struct snd_kcontrol *kcontrol, int op_flag,
844 unsigned int size, unsigned int __user *_tlv)
845 {
846 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
847 DECLARE_TLV_DB_MINMAX(scale, 0, 0);
848
849 if (size < sizeof(scale))
850 return -ENOMEM;
851
852 /* UAC volume resolution is 1/256 dB, TLV is 1/100 dB */
853 scale[2] = (prm->volume_min * 100) / 256;
854 scale[3] = (prm->volume_max * 100) / 256;
855 if (copy_to_user(_tlv, scale, sizeof(scale)))
856 return -EFAULT;
857
858 return 0;
859 }
860
u_audio_volume_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)861 static int u_audio_volume_info(struct snd_kcontrol *kcontrol,
862 struct snd_ctl_elem_info *uinfo)
863 {
864 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
865
866 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
867 uinfo->count = 1;
868 uinfo->value.integer.min = 0;
869 uinfo->value.integer.max =
870 (prm->volume_max - prm->volume_min + prm->volume_res - 1)
871 / prm->volume_res;
872 uinfo->value.integer.step = 1;
873
874 return 0;
875 }
876
u_audio_volume_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)877 static int u_audio_volume_get(struct snd_kcontrol *kcontrol,
878 struct snd_ctl_elem_value *ucontrol)
879 {
880 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
881 unsigned long flags;
882
883 spin_lock_irqsave(&prm->lock, flags);
884 ucontrol->value.integer.value[0] =
885 (prm->volume - prm->volume_min) / prm->volume_res;
886 spin_unlock_irqrestore(&prm->lock, flags);
887
888 return 0;
889 }
890
u_audio_volume_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)891 static int u_audio_volume_put(struct snd_kcontrol *kcontrol,
892 struct snd_ctl_elem_value *ucontrol)
893 {
894 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
895 struct snd_uac_chip *uac = prm->uac;
896 struct g_audio *audio_dev = uac->audio_dev;
897 unsigned int val;
898 s16 volume;
899 unsigned long flags;
900 int change = 0;
901
902 val = ucontrol->value.integer.value[0];
903
904 spin_lock_irqsave(&prm->lock, flags);
905 volume = (val * prm->volume_res) + prm->volume_min;
906 volume = clamp(volume, prm->volume_min, prm->volume_max);
907 if (volume != prm->volume) {
908 prm->volume = volume;
909 change = 1;
910 }
911 spin_unlock_irqrestore(&prm->lock, flags);
912
913 if (change && audio_dev->notify)
914 audio_dev->notify(audio_dev, prm->fu_id, UAC_FU_VOLUME);
915
916 return change;
917 }
918
919
920 static struct snd_kcontrol_new u_audio_controls[] = {
921 [UAC_FBACK_CTRL] {
922 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
923 .name = "Capture Pitch 1000000",
924 .info = u_audio_pitch_info,
925 .get = u_audio_pitch_get,
926 .put = u_audio_pitch_put,
927 },
928 [UAC_MUTE_CTRL] {
929 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
930 .name = "", /* will be filled later */
931 .info = u_audio_mute_info,
932 .get = u_audio_mute_get,
933 .put = u_audio_mute_put,
934 },
935 [UAC_VOLUME_CTRL] {
936 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
937 .name = "", /* will be filled later */
938 .info = u_audio_volume_info,
939 .get = u_audio_volume_get,
940 .put = u_audio_volume_put,
941 },
942 };
943
g_audio_setup(struct g_audio * g_audio,const char * pcm_name,const char * card_name)944 int g_audio_setup(struct g_audio *g_audio, const char *pcm_name,
945 const char *card_name)
946 {
947 struct snd_uac_chip *uac;
948 struct snd_card *card;
949 struct snd_pcm *pcm;
950 struct snd_kcontrol *kctl;
951 struct uac_params *params;
952 int p_chmask, c_chmask;
953 int i, err;
954
955 if (!g_audio)
956 return -EINVAL;
957
958 uac = kzalloc(sizeof(*uac), GFP_KERNEL);
959 if (!uac)
960 return -ENOMEM;
961 g_audio->uac = uac;
962 uac->audio_dev = g_audio;
963
964 params = &g_audio->params;
965 p_chmask = params->p_chmask;
966 c_chmask = params->c_chmask;
967
968 if (c_chmask) {
969 struct uac_rtd_params *prm = &uac->c_prm;
970
971 spin_lock_init(&prm->lock);
972 uac->c_prm.uac = uac;
973 prm->max_psize = g_audio->out_ep_maxpsize;
974
975 prm->reqs = kcalloc(params->req_number,
976 sizeof(struct usb_request *),
977 GFP_KERNEL);
978 if (!prm->reqs) {
979 err = -ENOMEM;
980 goto fail;
981 }
982
983 prm->rbuf = kcalloc(params->req_number, prm->max_psize,
984 GFP_KERNEL);
985 if (!prm->rbuf) {
986 prm->max_psize = 0;
987 err = -ENOMEM;
988 goto fail;
989 }
990 }
991
992 if (p_chmask) {
993 struct uac_rtd_params *prm = &uac->p_prm;
994
995 spin_lock_init(&prm->lock);
996 uac->p_prm.uac = uac;
997 prm->max_psize = g_audio->in_ep_maxpsize;
998
999 prm->reqs = kcalloc(params->req_number,
1000 sizeof(struct usb_request *),
1001 GFP_KERNEL);
1002 if (!prm->reqs) {
1003 err = -ENOMEM;
1004 goto fail;
1005 }
1006
1007 prm->rbuf = kcalloc(params->req_number, prm->max_psize,
1008 GFP_KERNEL);
1009 if (!prm->rbuf) {
1010 prm->max_psize = 0;
1011 err = -ENOMEM;
1012 goto fail;
1013 }
1014 }
1015
1016 /* Choose any slot, with no id */
1017 err = snd_card_new(&g_audio->gadget->dev,
1018 -1, NULL, THIS_MODULE, 0, &card);
1019 if (err < 0)
1020 goto fail;
1021
1022 uac->card = card;
1023
1024 /*
1025 * Create first PCM device
1026 * Create a substream only for non-zero channel streams
1027 */
1028 err = snd_pcm_new(uac->card, pcm_name, 0,
1029 p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
1030 if (err < 0)
1031 goto snd_fail;
1032
1033 strscpy(pcm->name, pcm_name, sizeof(pcm->name));
1034 pcm->private_data = uac;
1035 uac->pcm = pcm;
1036
1037 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops);
1038 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops);
1039
1040 /*
1041 * Create mixer and controls
1042 * Create only if it's required on USB side
1043 */
1044 if ((c_chmask && g_audio->in_ep_fback)
1045 || (p_chmask && params->p_fu.id)
1046 || (c_chmask && params->c_fu.id))
1047 strscpy(card->mixername, card_name, sizeof(card->driver));
1048
1049 if (c_chmask && g_audio->in_ep_fback) {
1050 kctl = snd_ctl_new1(&u_audio_controls[UAC_FBACK_CTRL],
1051 &uac->c_prm);
1052 if (!kctl) {
1053 err = -ENOMEM;
1054 goto snd_fail;
1055 }
1056
1057 kctl->id.device = pcm->device;
1058 kctl->id.subdevice = 0;
1059
1060 err = snd_ctl_add(card, kctl);
1061 if (err < 0)
1062 goto snd_fail;
1063 }
1064
1065 for (i = 0; i <= SNDRV_PCM_STREAM_LAST; i++) {
1066 struct uac_rtd_params *prm;
1067 struct uac_fu_params *fu;
1068 char ctrl_name[24];
1069 char *direction;
1070
1071 if (!pcm->streams[i].substream_count)
1072 continue;
1073
1074 if (i == SNDRV_PCM_STREAM_PLAYBACK) {
1075 prm = &uac->p_prm;
1076 fu = ¶ms->p_fu;
1077 direction = "Playback";
1078 } else {
1079 prm = &uac->c_prm;
1080 fu = ¶ms->c_fu;
1081 direction = "Capture";
1082 }
1083
1084 prm->fu_id = fu->id;
1085
1086 if (fu->mute_present) {
1087 snprintf(ctrl_name, sizeof(ctrl_name),
1088 "PCM %s Switch", direction);
1089
1090 u_audio_controls[UAC_MUTE_CTRL].name = ctrl_name;
1091
1092 kctl = snd_ctl_new1(&u_audio_controls[UAC_MUTE_CTRL],
1093 prm);
1094 if (!kctl) {
1095 err = -ENOMEM;
1096 goto snd_fail;
1097 }
1098
1099 kctl->id.device = pcm->device;
1100 kctl->id.subdevice = 0;
1101
1102 err = snd_ctl_add(card, kctl);
1103 if (err < 0)
1104 goto snd_fail;
1105 prm->snd_kctl_mute = kctl;
1106 prm->mute = 0;
1107 }
1108
1109 if (fu->volume_present) {
1110 snprintf(ctrl_name, sizeof(ctrl_name),
1111 "PCM %s Volume", direction);
1112
1113 u_audio_controls[UAC_VOLUME_CTRL].name = ctrl_name;
1114
1115 kctl = snd_ctl_new1(&u_audio_controls[UAC_VOLUME_CTRL],
1116 prm);
1117 if (!kctl) {
1118 err = -ENOMEM;
1119 goto snd_fail;
1120 }
1121
1122 kctl->id.device = pcm->device;
1123 kctl->id.subdevice = 0;
1124
1125
1126 kctl->tlv.c = u_audio_volume_tlv;
1127 kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1128 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1129
1130 err = snd_ctl_add(card, kctl);
1131 if (err < 0)
1132 goto snd_fail;
1133 prm->snd_kctl_volume = kctl;
1134 prm->volume = fu->volume_max;
1135 prm->volume_max = fu->volume_max;
1136 prm->volume_min = fu->volume_min;
1137 prm->volume_res = fu->volume_res;
1138 }
1139 }
1140
1141 strscpy(card->driver, card_name, sizeof(card->driver));
1142 strscpy(card->shortname, card_name, sizeof(card->shortname));
1143 sprintf(card->longname, "%s %i", card_name, card->dev->id);
1144
1145 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
1146 NULL, 0, BUFF_SIZE_MAX);
1147
1148 err = snd_card_register(card);
1149
1150 if (!err)
1151 return 0;
1152
1153 snd_fail:
1154 snd_card_free(card);
1155 fail:
1156 kfree(uac->p_prm.reqs);
1157 kfree(uac->c_prm.reqs);
1158 kfree(uac->p_prm.rbuf);
1159 kfree(uac->c_prm.rbuf);
1160 kfree(uac);
1161
1162 return err;
1163 }
1164 EXPORT_SYMBOL_GPL(g_audio_setup);
1165
g_audio_cleanup(struct g_audio * g_audio)1166 void g_audio_cleanup(struct g_audio *g_audio)
1167 {
1168 struct snd_uac_chip *uac;
1169 struct snd_card *card;
1170
1171 if (!g_audio || !g_audio->uac)
1172 return;
1173
1174 uac = g_audio->uac;
1175 card = uac->card;
1176 if (card)
1177 snd_card_free_when_closed(card);
1178
1179 kfree(uac->p_prm.reqs);
1180 kfree(uac->c_prm.reqs);
1181 kfree(uac->p_prm.rbuf);
1182 kfree(uac->c_prm.rbuf);
1183 kfree(uac);
1184 }
1185 EXPORT_SYMBOL_GPL(g_audio_cleanup);
1186
1187 MODULE_LICENSE("GPL");
1188 MODULE_DESCRIPTION("USB gadget \"ALSA sound card\" utilities");
1189 MODULE_AUTHOR("Ruslan Bilovol");
1190