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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 <[email protected]>
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 ([email protected])
12 * Jaswinder Singh ([email protected])
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
30enum {
31 UAC_FBACK_CTRL,
32 UAC_P_PITCH_CTRL,
33 UAC_MUTE_CTRL,
34 UAC_VOLUME_CTRL,
35 UAC_RATE_CTRL,
36};
37
38/* Runtime data params for one stream */
39struct uac_rtd_params {
40 struct snd_uac_chip *uac; /* parent chip */
41 bool ep_enabled; /* if the ep is enabled */
42
43 struct snd_pcm_substream *ss;
44
45 /* Ring buffer */
46 ssize_t hw_ptr;
47
48 void *rbuf;
49
50 unsigned int pitch; /* Stream pitch ratio to 1000000 */
51 unsigned int max_psize; /* MaxPacketSize of endpoint */
52
53 struct usb_request **reqs;
54
55 struct usb_request *req_fback; /* Feedback endpoint request */
56 bool fb_ep_enabled; /* if the ep is enabled */
57
58 /* Volume/Mute controls and their state */
59 int fu_id; /* Feature Unit ID */
60 struct snd_ctl_elem_id snd_kctl_volume_id;
61 struct snd_ctl_elem_id snd_kctl_mute_id;
62 s16 volume_min, volume_max, volume_res;
63 s16 volume;
64 int mute;
65
66 struct snd_ctl_elem_id snd_kctl_rate_id; /* read-only current rate */
67 int srate; /* selected samplerate */
68 int active; /* playback/capture running */
69
70 spinlock_t lock; /* lock for control transfers */
71
72};
73
74struct snd_uac_chip {
75 struct g_audio *audio_dev;
76
77 struct uac_rtd_params p_prm;
78 struct uac_rtd_params c_prm;
79
80 struct snd_card *card;
81 struct snd_pcm *pcm;
82
83 /* pre-calculated values for playback iso completion */
84 unsigned long long p_residue_mil;
85 unsigned int p_interval;
86 unsigned int p_framesize;
87};
88
89static const struct snd_pcm_hardware uac_pcm_hardware = {
90 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER
91 | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID
92 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
93 .rates = SNDRV_PCM_RATE_CONTINUOUS,
94 .periods_max = BUFF_SIZE_MAX / PRD_SIZE_MAX,
95 .buffer_bytes_max = BUFF_SIZE_MAX,
96 .period_bytes_max = PRD_SIZE_MAX,
97 .periods_min = MIN_PERIODS,
98};
99
100static void u_audio_set_fback_frequency(enum usb_device_speed speed,
101 struct usb_ep *out_ep,
102 unsigned long long freq,
103 unsigned int pitch,
104 void *buf)
105{
106 u32 ff = 0;
107 const struct usb_endpoint_descriptor *ep_desc;
108
109 /*
110 * Because the pitch base is 1000000, the final divider here
111 * will be 1000 * 1000000 = 1953125 << 9
112 *
113 * Instead of dealing with big numbers lets fold this 9 left shift
114 */
115
116 if (speed == USB_SPEED_FULL) {
117 /*
118 * Full-speed feedback endpoints report frequency
119 * in samples/frame
120 * Format is encoded in Q10.10 left-justified in the 24 bits,
121 * so that it has a Q10.14 format.
122 *
123 * ff = (freq << 14) / 1000
124 */
125 freq <<= 5;
126 } else {
127 /*
128 * High-speed feedback endpoints report frequency
129 * in samples/microframe.
130 * Format is encoded in Q12.13 fitted into four bytes so that
131 * the binary point is located between the second and the third
132 * byte fromat (that is Q16.16)
133 *
134 * ff = (freq << 16) / 8000
135 *
136 * Win10 and OSX UAC2 drivers require number of samples per packet
137 * in order to honor the feedback value.
138 * Linux snd-usb-audio detects the applied bit-shift automatically.
139 */
140 ep_desc = out_ep->desc;
141 freq <<= 4 + (ep_desc->bInterval - 1);
142 }
143
144 ff = DIV_ROUND_CLOSEST_ULL((freq * pitch), 1953125);
145
146 *(__le32 *)buf = cpu_to_le32(ff);
147}
148
149static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req)
150{
151 unsigned int pending;
152 unsigned int hw_ptr;
153 int status = req->status;
154 struct snd_pcm_substream *substream;
155 struct snd_pcm_runtime *runtime;
156 struct uac_rtd_params *prm = req->context;
157 struct snd_uac_chip *uac = prm->uac;
158 unsigned int frames, p_pktsize;
159 unsigned long long pitched_rate_mil, p_pktsize_residue_mil,
160 residue_frames_mil, div_result;
161
162 /* i/f shutting down */
163 if (!prm->ep_enabled) {
164 usb_ep_free_request(ep, req);
165 return;
166 }
167
168 if (req->status == -ESHUTDOWN)
169 return;
170
171 /*
172 * We can't really do much about bad xfers.
173 * Afterall, the ISOCH xfers could fail legitimately.
174 */
175 if (status)
176 pr_debug("%s: iso_complete status(%d) %d/%d\n",
177 __func__, status, req->actual, req->length);
178
179 substream = prm->ss;
180
181 /* Do nothing if ALSA isn't active */
182 if (!substream)
183 goto exit;
184
185 snd_pcm_stream_lock(substream);
186
187 runtime = substream->runtime;
188 if (!runtime || !snd_pcm_running(substream)) {
189 snd_pcm_stream_unlock(substream);
190 goto exit;
191 }
192
193 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
194 /*
195 * For each IN packet, take the quotient of the current data
196 * rate and the endpoint's interval as the base packet size.
197 * If there is a residue from this division, add it to the
198 * residue accumulator.
199 */
200 unsigned long long p_interval_mil = uac->p_interval * 1000000ULL;
201
202 pitched_rate_mil = (unsigned long long) prm->srate * prm->pitch;
203 div_result = pitched_rate_mil;
204 do_div(div_result, uac->p_interval);
205 do_div(div_result, 1000000);
206 frames = (unsigned int) div_result;
207
208 pr_debug("p_srate %d, pitch %d, interval_mil %llu, frames %d\n",
209 prm->srate, prm->pitch, p_interval_mil, frames);
210
211 p_pktsize = min_t(unsigned int,
212 uac->p_framesize * frames,
213 ep->maxpacket);
214
215 if (p_pktsize < ep->maxpacket) {
216 residue_frames_mil = pitched_rate_mil - frames * p_interval_mil;
217 p_pktsize_residue_mil = uac->p_framesize * residue_frames_mil;
218 } else
219 p_pktsize_residue_mil = 0;
220
221 req->length = p_pktsize;
222 uac->p_residue_mil += p_pktsize_residue_mil;
223
224 /*
225 * Whenever there are more bytes in the accumulator p_residue_mil than we
226 * need to add one more sample frame, increase this packet's
227 * size and decrease the accumulator.
228 */
229 div_result = uac->p_residue_mil;
230 do_div(div_result, uac->p_interval);
231 do_div(div_result, 1000000);
232 if ((unsigned int) div_result >= uac->p_framesize) {
233 req->length += uac->p_framesize;
234 uac->p_residue_mil -= uac->p_framesize * p_interval_mil;
235 pr_debug("increased req length to %d\n", req->length);
236 }
237 pr_debug("remains uac->p_residue_mil %llu\n", uac->p_residue_mil);
238
239 req->actual = req->length;
240 }
241
242 hw_ptr = prm->hw_ptr;
243
244 /* Pack USB load in ALSA ring buffer */
245 pending = runtime->dma_bytes - hw_ptr;
246
247 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
248 if (unlikely(pending < req->actual)) {
249 memcpy(req->buf, runtime->dma_area + hw_ptr, pending);
250 memcpy(req->buf + pending, runtime->dma_area,
251 req->actual - pending);
252 } else {
253 memcpy(req->buf, runtime->dma_area + hw_ptr,
254 req->actual);
255 }
256 } else {
257 if (unlikely(pending < req->actual)) {
258 memcpy(runtime->dma_area + hw_ptr, req->buf, pending);
259 memcpy(runtime->dma_area, req->buf + pending,
260 req->actual - pending);
261 } else {
262 memcpy(runtime->dma_area + hw_ptr, req->buf,
263 req->actual);
264 }
265 }
266
267 /* update hw_ptr after data is copied to memory */
268 prm->hw_ptr = (hw_ptr + req->actual) % runtime->dma_bytes;
269 hw_ptr = prm->hw_ptr;
270 snd_pcm_stream_unlock(substream);
271
272 if ((hw_ptr % snd_pcm_lib_period_bytes(substream)) < req->actual)
273 snd_pcm_period_elapsed(substream);
274
275exit:
276 if (usb_ep_queue(ep, req, GFP_ATOMIC))
277 dev_err(uac->card->dev, "%d Error!\n", __LINE__);
278}
279
280static void u_audio_iso_fback_complete(struct usb_ep *ep,
281 struct usb_request *req)
282{
283 struct uac_rtd_params *prm = req->context;
284 struct snd_uac_chip *uac = prm->uac;
285 struct g_audio *audio_dev = uac->audio_dev;
286 int status = req->status;
287
288 /* i/f shutting down */
289 if (!prm->fb_ep_enabled) {
290 kfree(req->buf);
291 usb_ep_free_request(ep, req);
292 return;
293 }
294
295 if (req->status == -ESHUTDOWN)
296 return;
297
298 /*
299 * We can't really do much about bad xfers.
300 * Afterall, the ISOCH xfers could fail legitimately.
301 */
302 if (status)
303 pr_debug("%s: iso_complete status(%d) %d/%d\n",
304 __func__, status, req->actual, req->length);
305
306 u_audio_set_fback_frequency(audio_dev->gadget->speed, audio_dev->out_ep,
307 prm->srate, prm->pitch,
308 req->buf);
309
310 if (usb_ep_queue(ep, req, GFP_ATOMIC))
311 dev_err(uac->card->dev, "%d Error!\n", __LINE__);
312}
313
314static int uac_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
315{
316 struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
317 struct uac_rtd_params *prm;
318 struct g_audio *audio_dev;
319 struct uac_params *params;
320 int err = 0;
321
322 audio_dev = uac->audio_dev;
323 params = &audio_dev->params;
324
325 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
326 prm = &uac->p_prm;
327 else
328 prm = &uac->c_prm;
329
330 /* Reset */
331 prm->hw_ptr = 0;
332
333 switch (cmd) {
334 case SNDRV_PCM_TRIGGER_START:
335 case SNDRV_PCM_TRIGGER_RESUME:
336 prm->ss = substream;
337 break;
338 case SNDRV_PCM_TRIGGER_STOP:
339 case SNDRV_PCM_TRIGGER_SUSPEND:
340 prm->ss = NULL;
341 break;
342 default:
343 err = -EINVAL;
344 }
345
346 /* Clear buffer after Play stops */
347 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !prm->ss)
348 memset(prm->rbuf, 0, prm->max_psize * params->req_number);
349
350 return err;
351}
352
353static snd_pcm_uframes_t uac_pcm_pointer(struct snd_pcm_substream *substream)
354{
355 struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
356 struct uac_rtd_params *prm;
357
358 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
359 prm = &uac->p_prm;
360 else
361 prm = &uac->c_prm;
362
363 return bytes_to_frames(substream->runtime, prm->hw_ptr);
364}
365
366static u64 uac_ssize_to_fmt(int ssize)
367{
368 u64 ret;
369
370 switch (ssize) {
371 case 3:
372 ret = SNDRV_PCM_FMTBIT_S24_3LE;
373 break;
374 case 4:
375 ret = SNDRV_PCM_FMTBIT_S32_LE;
376 break;
377 default:
378 ret = SNDRV_PCM_FMTBIT_S16_LE;
379 break;
380 }
381
382 return ret;
383}
384
385static int uac_pcm_open(struct snd_pcm_substream *substream)
386{
387 struct snd_uac_chip *uac = snd_pcm_substream_chip(substream);
388 struct snd_pcm_runtime *runtime = substream->runtime;
389 struct g_audio *audio_dev;
390 struct uac_params *params;
391 struct uac_rtd_params *prm;
392 int p_ssize, c_ssize;
393 int p_chmask, c_chmask;
394
395 audio_dev = uac->audio_dev;
396 params = &audio_dev->params;
397 p_ssize = params->p_ssize;
398 c_ssize = params->c_ssize;
399 p_chmask = params->p_chmask;
400 c_chmask = params->c_chmask;
401 uac->p_residue_mil = 0;
402
403 runtime->hw = uac_pcm_hardware;
404
405 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
406 runtime->hw.formats = uac_ssize_to_fmt(p_ssize);
407 runtime->hw.channels_min = num_channels(p_chmask);
408 prm = &uac->p_prm;
409 } else {
410 runtime->hw.formats = uac_ssize_to_fmt(c_ssize);
411 runtime->hw.channels_min = num_channels(c_chmask);
412 prm = &uac->c_prm;
413 }
414
415 runtime->hw.period_bytes_min = 2 * prm->max_psize
416 / runtime->hw.periods_min;
417 runtime->hw.rate_min = prm->srate;
418 runtime->hw.rate_max = runtime->hw.rate_min;
419 runtime->hw.channels_max = runtime->hw.channels_min;
420
421 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
422
423 return 0;
424}
425
426/* ALSA cries without these function pointers */
427static int uac_pcm_null(struct snd_pcm_substream *substream)
428{
429 return 0;
430}
431
432static const struct snd_pcm_ops uac_pcm_ops = {
433 .open = uac_pcm_open,
434 .close = uac_pcm_null,
435 .trigger = uac_pcm_trigger,
436 .pointer = uac_pcm_pointer,
437 .prepare = uac_pcm_null,
438};
439
440static inline void free_ep(struct uac_rtd_params *prm, struct usb_ep *ep)
441{
442 struct snd_uac_chip *uac = prm->uac;
443 struct g_audio *audio_dev;
444 struct uac_params *params;
445 int i;
446
447 if (!prm->ep_enabled)
448 return;
449
450 audio_dev = uac->audio_dev;
451 params = &audio_dev->params;
452
453 for (i = 0; i < params->req_number; i++) {
454 if (prm->reqs[i]) {
455 if (usb_ep_dequeue(ep, prm->reqs[i]))
456 usb_ep_free_request(ep, prm->reqs[i]);
457 /*
458 * If usb_ep_dequeue() cannot successfully dequeue the
459 * request, the request will be freed by the completion
460 * callback.
461 */
462
463 prm->reqs[i] = NULL;
464 }
465 }
466
467 prm->ep_enabled = false;
468
469 if (usb_ep_disable(ep))
470 dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__);
471}
472
473static inline void free_ep_fback(struct uac_rtd_params *prm, struct usb_ep *ep)
474{
475 struct snd_uac_chip *uac = prm->uac;
476
477 if (!prm->fb_ep_enabled)
478 return;
479
480 if (prm->req_fback) {
481 if (usb_ep_dequeue(ep, prm->req_fback)) {
482 kfree(prm->req_fback->buf);
483 usb_ep_free_request(ep, prm->req_fback);
484 }
485 prm->req_fback = NULL;
486 }
487
488 prm->fb_ep_enabled = false;
489
490 if (usb_ep_disable(ep))
491 dev_err(uac->card->dev, "%s:%d Error!\n", __func__, __LINE__);
492}
493
494static void set_active(struct uac_rtd_params *prm, bool active)
495{
496 // notifying through the Rate ctrl
497 unsigned long flags;
498
499 spin_lock_irqsave(&prm->lock, flags);
500 if (prm->active != active) {
501 prm->active = active;
502 snd_ctl_notify(prm->uac->card, SNDRV_CTL_EVENT_MASK_VALUE,
503 &prm->snd_kctl_rate_id);
504 }
505 spin_unlock_irqrestore(&prm->lock, flags);
506}
507
508int u_audio_set_capture_srate(struct g_audio *audio_dev, int srate)
509{
510 struct uac_params *params = &audio_dev->params;
511 struct snd_uac_chip *uac = audio_dev->uac;
512 struct uac_rtd_params *prm;
513 int i;
514 unsigned long flags;
515
516 dev_dbg(&audio_dev->gadget->dev, "%s: srate %d\n", __func__, srate);
517 prm = &uac->c_prm;
518 for (i = 0; i < UAC_MAX_RATES; i++) {
519 if (params->c_srates[i] == srate) {
520 spin_lock_irqsave(&prm->lock, flags);
521 prm->srate = srate;
522 spin_unlock_irqrestore(&prm->lock, flags);
523 return 0;
524 }
525 if (params->c_srates[i] == 0)
526 break;
527 }
528
529 return -EINVAL;
530}
531EXPORT_SYMBOL_GPL(u_audio_set_capture_srate);
532
533int u_audio_get_capture_srate(struct g_audio *audio_dev, u32 *val)
534{
535 struct snd_uac_chip *uac = audio_dev->uac;
536 struct uac_rtd_params *prm;
537 unsigned long flags;
538
539 prm = &uac->c_prm;
540 spin_lock_irqsave(&prm->lock, flags);
541 *val = prm->srate;
542 spin_unlock_irqrestore(&prm->lock, flags);
543 return 0;
544}
545EXPORT_SYMBOL_GPL(u_audio_get_capture_srate);
546
547int u_audio_set_playback_srate(struct g_audio *audio_dev, int srate)
548{
549 struct uac_params *params = &audio_dev->params;
550 struct snd_uac_chip *uac = audio_dev->uac;
551 struct uac_rtd_params *prm;
552 int i;
553 unsigned long flags;
554
555 dev_dbg(&audio_dev->gadget->dev, "%s: srate %d\n", __func__, srate);
556 prm = &uac->p_prm;
557 for (i = 0; i < UAC_MAX_RATES; i++) {
558 if (params->p_srates[i] == srate) {
559 spin_lock_irqsave(&prm->lock, flags);
560 prm->srate = srate;
561 spin_unlock_irqrestore(&prm->lock, flags);
562 return 0;
563 }
564 if (params->p_srates[i] == 0)
565 break;
566 }
567
568 return -EINVAL;
569}
570EXPORT_SYMBOL_GPL(u_audio_set_playback_srate);
571
572int u_audio_get_playback_srate(struct g_audio *audio_dev, u32 *val)
573{
574 struct snd_uac_chip *uac = audio_dev->uac;
575 struct uac_rtd_params *prm;
576 unsigned long flags;
577
578 prm = &uac->p_prm;
579 spin_lock_irqsave(&prm->lock, flags);
580 *val = prm->srate;
581 spin_unlock_irqrestore(&prm->lock, flags);
582 return 0;
583}
584EXPORT_SYMBOL_GPL(u_audio_get_playback_srate);
585
586int u_audio_start_capture(struct g_audio *audio_dev)
587{
588 struct snd_uac_chip *uac = audio_dev->uac;
589 struct usb_gadget *gadget = audio_dev->gadget;
590 struct device *dev = &gadget->dev;
591 struct usb_request *req, *req_fback;
592 struct usb_ep *ep, *ep_fback;
593 struct uac_rtd_params *prm;
594 struct uac_params *params = &audio_dev->params;
595 int req_len, i, ret;
596
597 prm = &uac->c_prm;
598 dev_dbg(dev, "start capture with rate %d\n", prm->srate);
599 ep = audio_dev->out_ep;
600 ret = config_ep_by_speed(gadget, &audio_dev->func, ep);
601 if (ret < 0) {
602 dev_err(dev, "config_ep_by_speed for out_ep failed (%d)\n", ret);
603 return ret;
604 }
605
606 req_len = ep->maxpacket;
607
608 prm->ep_enabled = true;
609 ret = usb_ep_enable(ep);
610 if (ret < 0) {
611 dev_err(dev, "usb_ep_enable failed for out_ep (%d)\n", ret);
612 return ret;
613 }
614
615 for (i = 0; i < params->req_number; i++) {
616 if (!prm->reqs[i]) {
617 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
618 if (req == NULL)
619 return -ENOMEM;
620
621 prm->reqs[i] = req;
622
623 req->zero = 0;
624 req->context = prm;
625 req->length = req_len;
626 req->complete = u_audio_iso_complete;
627 req->buf = prm->rbuf + i * ep->maxpacket;
628 }
629
630 if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC))
631 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
632 }
633
634 set_active(&uac->c_prm, true);
635
636 ep_fback = audio_dev->in_ep_fback;
637 if (!ep_fback)
638 return 0;
639
640 /* Setup feedback endpoint */
641 ret = config_ep_by_speed(gadget, &audio_dev->func, ep_fback);
642 if (ret < 0) {
643 dev_err(dev, "config_ep_by_speed in_ep_fback failed (%d)\n", ret);
644 goto err_out_ep;
645 }
646
647 ret = usb_ep_enable(ep_fback);
648 if (ret < 0) {
649 dev_err(dev, "usb_ep_enable failed for in_ep_fback (%d)\n", ret);
650 goto err_out_ep;
651 }
652 prm->fb_ep_enabled = true;
653 req_len = ep_fback->maxpacket;
654
655 req_fback = usb_ep_alloc_request(ep_fback, GFP_ATOMIC);
656 if (req_fback == NULL)
657 return -ENOMEM;
658
659 prm->req_fback = req_fback;
660 req_fback->zero = 0;
661 req_fback->context = prm;
662 req_fback->length = req_len;
663 req_fback->complete = u_audio_iso_fback_complete;
664
665 req_fback->buf = kzalloc(req_len, GFP_ATOMIC);
666 if (!req_fback->buf)
667 return -ENOMEM;
668
669 /*
670 * Configure the feedback endpoint's reported frequency.
671 * Always start with original frequency since its deviation can't
672 * be meauserd at start of playback
673 */
674 prm->pitch = 1000000;
675 u_audio_set_fback_frequency(audio_dev->gadget->speed, ep,
676 prm->srate, prm->pitch,
677 req_fback->buf);
678
679 if (usb_ep_queue(ep_fback, req_fback, GFP_ATOMIC))
680 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
681
682 return 0;
683
684err_out_ep:
685 set_active(prm, false);
686 free_ep(prm, ep);
687
688 return ret;
689}
690EXPORT_SYMBOL_GPL(u_audio_start_capture);
691
692void u_audio_stop_capture(struct g_audio *audio_dev)
693{
694 struct snd_uac_chip *uac = audio_dev->uac;
695
696 set_active(&uac->c_prm, false);
697 if (audio_dev->in_ep_fback)
698 free_ep_fback(&uac->c_prm, audio_dev->in_ep_fback);
699 free_ep(&uac->c_prm, audio_dev->out_ep);
700}
701EXPORT_SYMBOL_GPL(u_audio_stop_capture);
702
703int u_audio_start_playback(struct g_audio *audio_dev)
704{
705 struct snd_uac_chip *uac = audio_dev->uac;
706 struct usb_gadget *gadget = audio_dev->gadget;
707 struct device *dev = &gadget->dev;
708 struct usb_request *req;
709 struct usb_ep *ep;
710 struct uac_rtd_params *prm;
711 struct uac_params *params = &audio_dev->params;
712 unsigned int factor;
713 const struct usb_endpoint_descriptor *ep_desc;
714 int req_len, i, ret;
715 unsigned int p_pktsize;
716
717 prm = &uac->p_prm;
718 dev_dbg(dev, "start playback with rate %d\n", prm->srate);
719 ep = audio_dev->in_ep;
720 ret = config_ep_by_speed(gadget, &audio_dev->func, ep);
721 if (ret < 0) {
722 dev_err(dev, "config_ep_by_speed for in_ep failed (%d)\n", ret);
723 return ret;
724 }
725
726 ep_desc = ep->desc;
727 /*
728 * Always start with original frequency
729 */
730 prm->pitch = 1000000;
731
732 /* pre-calculate the playback endpoint's interval */
733 if (gadget->speed == USB_SPEED_FULL)
734 factor = 1000;
735 else
736 factor = 8000;
737
738 /* pre-compute some values for iso_complete() */
739 uac->p_framesize = params->p_ssize *
740 num_channels(params->p_chmask);
741 uac->p_interval = factor / (1 << (ep_desc->bInterval - 1));
742 p_pktsize = min_t(unsigned int,
743 uac->p_framesize *
744 (prm->srate / uac->p_interval),
745 ep->maxpacket);
746
747 req_len = p_pktsize;
748 uac->p_residue_mil = 0;
749
750 prm->ep_enabled = true;
751 ret = usb_ep_enable(ep);
752 if (ret < 0) {
753 dev_err(dev, "usb_ep_enable failed for in_ep (%d)\n", ret);
754 return ret;
755 }
756
757 for (i = 0; i < params->req_number; i++) {
758 if (!prm->reqs[i]) {
759 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
760 if (req == NULL)
761 return -ENOMEM;
762
763 prm->reqs[i] = req;
764
765 req->zero = 0;
766 req->context = prm;
767 req->length = req_len;
768 req->complete = u_audio_iso_complete;
769 req->buf = prm->rbuf + i * ep->maxpacket;
770 }
771
772 if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC))
773 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
774 }
775
776 set_active(&uac->p_prm, true);
777
778 return 0;
779}
780EXPORT_SYMBOL_GPL(u_audio_start_playback);
781
782void u_audio_stop_playback(struct g_audio *audio_dev)
783{
784 struct snd_uac_chip *uac = audio_dev->uac;
785
786 set_active(&uac->p_prm, false);
787 free_ep(&uac->p_prm, audio_dev->in_ep);
788}
789EXPORT_SYMBOL_GPL(u_audio_stop_playback);
790
791void u_audio_suspend(struct g_audio *audio_dev)
792{
793 struct snd_uac_chip *uac = audio_dev->uac;
794
795 set_active(&uac->p_prm, false);
796 set_active(&uac->c_prm, false);
797}
798EXPORT_SYMBOL_GPL(u_audio_suspend);
799
800int u_audio_get_volume(struct g_audio *audio_dev, int playback, s16 *val)
801{
802 struct snd_uac_chip *uac = audio_dev->uac;
803 struct uac_rtd_params *prm;
804 unsigned long flags;
805
806 if (playback)
807 prm = &uac->p_prm;
808 else
809 prm = &uac->c_prm;
810
811 spin_lock_irqsave(&prm->lock, flags);
812 *val = prm->volume;
813 spin_unlock_irqrestore(&prm->lock, flags);
814
815 return 0;
816}
817EXPORT_SYMBOL_GPL(u_audio_get_volume);
818
819int u_audio_set_volume(struct g_audio *audio_dev, int playback, s16 val)
820{
821 struct snd_uac_chip *uac = audio_dev->uac;
822 struct uac_rtd_params *prm;
823 unsigned long flags;
824 int change = 0;
825
826 if (playback)
827 prm = &uac->p_prm;
828 else
829 prm = &uac->c_prm;
830
831 spin_lock_irqsave(&prm->lock, flags);
832 val = clamp(val, prm->volume_min, prm->volume_max);
833 if (prm->volume != val) {
834 prm->volume = val;
835 change = 1;
836 }
837 spin_unlock_irqrestore(&prm->lock, flags);
838
839 if (change)
840 snd_ctl_notify(uac->card, SNDRV_CTL_EVENT_MASK_VALUE,
841 &prm->snd_kctl_volume_id);
842
843 return 0;
844}
845EXPORT_SYMBOL_GPL(u_audio_set_volume);
846
847int u_audio_get_mute(struct g_audio *audio_dev, int playback, int *val)
848{
849 struct snd_uac_chip *uac = audio_dev->uac;
850 struct uac_rtd_params *prm;
851 unsigned long flags;
852
853 if (playback)
854 prm = &uac->p_prm;
855 else
856 prm = &uac->c_prm;
857
858 spin_lock_irqsave(&prm->lock, flags);
859 *val = prm->mute;
860 spin_unlock_irqrestore(&prm->lock, flags);
861
862 return 0;
863}
864EXPORT_SYMBOL_GPL(u_audio_get_mute);
865
866int u_audio_set_mute(struct g_audio *audio_dev, int playback, int val)
867{
868 struct snd_uac_chip *uac = audio_dev->uac;
869 struct uac_rtd_params *prm;
870 unsigned long flags;
871 int change = 0;
872 int mute;
873
874 if (playback)
875 prm = &uac->p_prm;
876 else
877 prm = &uac->c_prm;
878
879 mute = val ? 1 : 0;
880
881 spin_lock_irqsave(&prm->lock, flags);
882 if (prm->mute != mute) {
883 prm->mute = mute;
884 change = 1;
885 }
886 spin_unlock_irqrestore(&prm->lock, flags);
887
888 if (change)
889 snd_ctl_notify(uac->card, SNDRV_CTL_EVENT_MASK_VALUE,
890 &prm->snd_kctl_mute_id);
891
892 return 0;
893}
894EXPORT_SYMBOL_GPL(u_audio_set_mute);
895
896
897static int u_audio_pitch_info(struct snd_kcontrol *kcontrol,
898 struct snd_ctl_elem_info *uinfo)
899{
900 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
901 struct snd_uac_chip *uac = prm->uac;
902 struct g_audio *audio_dev = uac->audio_dev;
903 struct uac_params *params = &audio_dev->params;
904 unsigned int pitch_min, pitch_max;
905
906 pitch_min = (1000 - FBACK_SLOW_MAX) * 1000;
907 pitch_max = (1000 + params->fb_max) * 1000;
908
909 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
910 uinfo->count = 1;
911 uinfo->value.integer.min = pitch_min;
912 uinfo->value.integer.max = pitch_max;
913 uinfo->value.integer.step = 1;
914 return 0;
915}
916
917static int u_audio_pitch_get(struct snd_kcontrol *kcontrol,
918 struct snd_ctl_elem_value *ucontrol)
919{
920 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
921
922 ucontrol->value.integer.value[0] = prm->pitch;
923
924 return 0;
925}
926
927static int u_audio_pitch_put(struct snd_kcontrol *kcontrol,
928 struct snd_ctl_elem_value *ucontrol)
929{
930 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
931 struct snd_uac_chip *uac = prm->uac;
932 struct g_audio *audio_dev = uac->audio_dev;
933 struct uac_params *params = &audio_dev->params;
934 unsigned int val;
935 unsigned int pitch_min, pitch_max;
936 int change = 0;
937
938 pitch_min = (1000 - FBACK_SLOW_MAX) * 1000;
939 pitch_max = (1000 + params->fb_max) * 1000;
940
941 val = ucontrol->value.integer.value[0];
942
943 if (val < pitch_min)
944 val = pitch_min;
945 if (val > pitch_max)
946 val = pitch_max;
947
948 if (prm->pitch != val) {
949 prm->pitch = val;
950 change = 1;
951 }
952
953 return change;
954}
955
956static int u_audio_mute_info(struct snd_kcontrol *kcontrol,
957 struct snd_ctl_elem_info *uinfo)
958{
959 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
960 uinfo->count = 1;
961 uinfo->value.integer.min = 0;
962 uinfo->value.integer.max = 1;
963 uinfo->value.integer.step = 1;
964
965 return 0;
966}
967
968static int u_audio_mute_get(struct snd_kcontrol *kcontrol,
969 struct snd_ctl_elem_value *ucontrol)
970{
971 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
972 unsigned long flags;
973
974 spin_lock_irqsave(&prm->lock, flags);
975 ucontrol->value.integer.value[0] = !prm->mute;
976 spin_unlock_irqrestore(&prm->lock, flags);
977
978 return 0;
979}
980
981static int u_audio_mute_put(struct snd_kcontrol *kcontrol,
982 struct snd_ctl_elem_value *ucontrol)
983{
984 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
985 struct snd_uac_chip *uac = prm->uac;
986 struct g_audio *audio_dev = uac->audio_dev;
987 unsigned int val;
988 unsigned long flags;
989 int change = 0;
990
991 val = !ucontrol->value.integer.value[0];
992
993 spin_lock_irqsave(&prm->lock, flags);
994 if (val != prm->mute) {
995 prm->mute = val;
996 change = 1;
997 }
998 spin_unlock_irqrestore(&prm->lock, flags);
999
1000 if (change && audio_dev->notify)
1001 audio_dev->notify(audio_dev, prm->fu_id, UAC_FU_MUTE);
1002
1003 return change;
1004}
1005
1006/*
1007 * TLV callback for mixer volume controls
1008 */
1009static int u_audio_volume_tlv(struct snd_kcontrol *kcontrol, int op_flag,
1010 unsigned int size, unsigned int __user *_tlv)
1011{
1012 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
1013 DECLARE_TLV_DB_MINMAX(scale, 0, 0);
1014
1015 if (size < sizeof(scale))
1016 return -ENOMEM;
1017
1018 /* UAC volume resolution is 1/256 dB, TLV is 1/100 dB */
1019 scale[2] = (prm->volume_min * 100) / 256;
1020 scale[3] = (prm->volume_max * 100) / 256;
1021 if (copy_to_user(_tlv, scale, sizeof(scale)))
1022 return -EFAULT;
1023
1024 return 0;
1025}
1026
1027static int u_audio_volume_info(struct snd_kcontrol *kcontrol,
1028 struct snd_ctl_elem_info *uinfo)
1029{
1030 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
1031
1032 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1033 uinfo->count = 1;
1034 uinfo->value.integer.min = 0;
1035 uinfo->value.integer.max =
1036 (prm->volume_max - prm->volume_min + prm->volume_res - 1)
1037 / prm->volume_res;
1038 uinfo->value.integer.step = 1;
1039
1040 return 0;
1041}
1042
1043static int u_audio_volume_get(struct snd_kcontrol *kcontrol,
1044 struct snd_ctl_elem_value *ucontrol)
1045{
1046 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
1047 unsigned long flags;
1048
1049 spin_lock_irqsave(&prm->lock, flags);
1050 ucontrol->value.integer.value[0] =
1051 (prm->volume - prm->volume_min) / prm->volume_res;
1052 spin_unlock_irqrestore(&prm->lock, flags);
1053
1054 return 0;
1055}
1056
1057static int u_audio_volume_put(struct snd_kcontrol *kcontrol,
1058 struct snd_ctl_elem_value *ucontrol)
1059{
1060 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
1061 struct snd_uac_chip *uac = prm->uac;
1062 struct g_audio *audio_dev = uac->audio_dev;
1063 unsigned int val;
1064 s16 volume;
1065 unsigned long flags;
1066 int change = 0;
1067
1068 val = ucontrol->value.integer.value[0];
1069
1070 spin_lock_irqsave(&prm->lock, flags);
1071 volume = (val * prm->volume_res) + prm->volume_min;
1072 volume = clamp(volume, prm->volume_min, prm->volume_max);
1073 if (volume != prm->volume) {
1074 prm->volume = volume;
1075 change = 1;
1076 }
1077 spin_unlock_irqrestore(&prm->lock, flags);
1078
1079 if (change && audio_dev->notify)
1080 audio_dev->notify(audio_dev, prm->fu_id, UAC_FU_VOLUME);
1081
1082 return change;
1083}
1084
1085static int get_max_srate(const int *srates)
1086{
1087 int i, max_srate = 0;
1088
1089 for (i = 0; i < UAC_MAX_RATES; i++) {
1090 if (srates[i] == 0)
1091 break;
1092 if (srates[i] > max_srate)
1093 max_srate = srates[i];
1094 }
1095 return max_srate;
1096}
1097
1098static int get_min_srate(const int *srates)
1099{
1100 int i, min_srate = INT_MAX;
1101
1102 for (i = 0; i < UAC_MAX_RATES; i++) {
1103 if (srates[i] == 0)
1104 break;
1105 if (srates[i] < min_srate)
1106 min_srate = srates[i];
1107 }
1108 return min_srate;
1109}
1110
1111static int u_audio_rate_info(struct snd_kcontrol *kcontrol,
1112 struct snd_ctl_elem_info *uinfo)
1113{
1114 const int *srates;
1115 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
1116 struct snd_uac_chip *uac = prm->uac;
1117 struct g_audio *audio_dev = uac->audio_dev;
1118 struct uac_params *params = &audio_dev->params;
1119
1120 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1121 uinfo->count = 1;
1122
1123 if (prm == &uac->c_prm)
1124 srates = params->c_srates;
1125 else
1126 srates = params->p_srates;
1127 uinfo->value.integer.min = get_min_srate(srates);
1128 uinfo->value.integer.max = get_max_srate(srates);
1129 return 0;
1130}
1131
1132static int u_audio_rate_get(struct snd_kcontrol *kcontrol,
1133 struct snd_ctl_elem_value *ucontrol)
1134{
1135 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
1136 unsigned long flags;
1137
1138 spin_lock_irqsave(&prm->lock, flags);
1139 if (prm->active)
1140 ucontrol->value.integer.value[0] = prm->srate;
1141 else
1142 /* not active: reporting zero rate */
1143 ucontrol->value.integer.value[0] = 0;
1144 spin_unlock_irqrestore(&prm->lock, flags);
1145 return 0;
1146}
1147
1148static struct snd_kcontrol_new u_audio_controls[] = {
1149 [UAC_FBACK_CTRL] = {
1150 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
1151 .name = "Capture Pitch 1000000",
1152 .info = u_audio_pitch_info,
1153 .get = u_audio_pitch_get,
1154 .put = u_audio_pitch_put,
1155 },
1156 [UAC_P_PITCH_CTRL] = {
1157 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
1158 .name = "Playback Pitch 1000000",
1159 .info = u_audio_pitch_info,
1160 .get = u_audio_pitch_get,
1161 .put = u_audio_pitch_put,
1162 },
1163 [UAC_MUTE_CTRL] = {
1164 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1165 .name = "", /* will be filled later */
1166 .info = u_audio_mute_info,
1167 .get = u_audio_mute_get,
1168 .put = u_audio_mute_put,
1169 },
1170 [UAC_VOLUME_CTRL] = {
1171 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1172 .name = "", /* will be filled later */
1173 .info = u_audio_volume_info,
1174 .get = u_audio_volume_get,
1175 .put = u_audio_volume_put,
1176 },
1177 [UAC_RATE_CTRL] = {
1178 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
1179 .name = "", /* will be filled later */
1180 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
1181 .info = u_audio_rate_info,
1182 .get = u_audio_rate_get,
1183 },
1184};
1185
1186static void u_audio_card_free(struct snd_card *card)
1187{
1188 struct snd_uac_chip *uac = card->private_data;
1189
1190 if (!uac)
1191 return;
1192
1193 kfree(uac->p_prm.reqs);
1194 kfree(uac->c_prm.reqs);
1195 kfree(uac->p_prm.rbuf);
1196 kfree(uac->c_prm.rbuf);
1197 kfree(uac);
1198}
1199
1200int g_audio_setup(struct g_audio *g_audio, const char *pcm_name,
1201 const char *card_name)
1202{
1203 struct snd_uac_chip *uac;
1204 struct snd_card *card;
1205 struct snd_pcm *pcm;
1206 struct snd_kcontrol *kctl;
1207 struct uac_params *params;
1208 int p_chmask, c_chmask;
1209 int i, err;
1210
1211 if (!g_audio)
1212 return -EINVAL;
1213
1214 uac = kzalloc_obj(*uac);
1215 if (!uac)
1216 return -ENOMEM;
1217 g_audio->uac = uac;
1218 uac->audio_dev = g_audio;
1219
1220 params = &g_audio->params;
1221 p_chmask = params->p_chmask;
1222 c_chmask = params->c_chmask;
1223
1224 if (c_chmask) {
1225 struct uac_rtd_params *prm = &uac->c_prm;
1226
1227 spin_lock_init(&prm->lock);
1228 uac->c_prm.uac = uac;
1229 prm->max_psize = g_audio->out_ep_maxpsize;
1230 prm->srate = params->c_srates[0];
1231
1232 prm->reqs = kzalloc_objs(struct usb_request *,
1233 params->req_number);
1234 if (!prm->reqs) {
1235 err = -ENOMEM;
1236 goto fail;
1237 }
1238
1239 prm->rbuf = kcalloc(params->req_number, prm->max_psize,
1240 GFP_KERNEL);
1241 if (!prm->rbuf) {
1242 prm->max_psize = 0;
1243 err = -ENOMEM;
1244 goto fail;
1245 }
1246 }
1247
1248 if (p_chmask) {
1249 struct uac_rtd_params *prm = &uac->p_prm;
1250
1251 spin_lock_init(&prm->lock);
1252 uac->p_prm.uac = uac;
1253 prm->max_psize = g_audio->in_ep_maxpsize;
1254 prm->srate = params->p_srates[0];
1255
1256 prm->reqs = kzalloc_objs(struct usb_request *,
1257 params->req_number);
1258 if (!prm->reqs) {
1259 err = -ENOMEM;
1260 goto fail;
1261 }
1262
1263 prm->rbuf = kcalloc(params->req_number, prm->max_psize,
1264 GFP_KERNEL);
1265 if (!prm->rbuf) {
1266 prm->max_psize = 0;
1267 err = -ENOMEM;
1268 goto fail;
1269 }
1270 }
1271
1272 /* Choose any slot, with no id */
1273 err = snd_card_new(&g_audio->gadget->dev,
1274 -1, NULL, THIS_MODULE, 0, &card);
1275 if (err < 0)
1276 goto fail;
1277
1278 uac->card = card;
1279 card->private_data = uac;
1280 card->private_free = u_audio_card_free;
1281
1282 /*
1283 * Create first PCM device
1284 * Create a substream only for non-zero channel streams
1285 */
1286 err = snd_pcm_new(uac->card, pcm_name, 0,
1287 p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
1288 if (err < 0)
1289 goto snd_fail;
1290
1291 strscpy(pcm->name, pcm_name);
1292 pcm->private_data = uac;
1293 uac->pcm = pcm;
1294
1295 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops);
1296 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops);
1297
1298 /*
1299 * Create mixer and controls
1300 * Create only if it's required on USB side
1301 */
1302 if ((c_chmask && g_audio->in_ep_fback)
1303 || (p_chmask && params->p_fu.id)
1304 || (c_chmask && params->c_fu.id))
1305 strscpy(card->mixername, card_name);
1306
1307 if (c_chmask && g_audio->in_ep_fback) {
1308 kctl = snd_ctl_new1(&u_audio_controls[UAC_FBACK_CTRL],
1309 &uac->c_prm);
1310 if (!kctl) {
1311 err = -ENOMEM;
1312 goto snd_fail;
1313 }
1314
1315 kctl->id.device = pcm->device;
1316 kctl->id.subdevice = 0;
1317
1318 err = snd_ctl_add(card, kctl);
1319 if (err < 0)
1320 goto snd_fail;
1321 }
1322
1323 if (p_chmask) {
1324 kctl = snd_ctl_new1(&u_audio_controls[UAC_P_PITCH_CTRL],
1325 &uac->p_prm);
1326 if (!kctl) {
1327 err = -ENOMEM;
1328 goto snd_fail;
1329 }
1330
1331 kctl->id.device = pcm->device;
1332 kctl->id.subdevice = 0;
1333
1334 err = snd_ctl_add(card, kctl);
1335 if (err < 0)
1336 goto snd_fail;
1337 }
1338
1339 for (i = 0; i <= SNDRV_PCM_STREAM_LAST; i++) {
1340 struct uac_rtd_params *prm;
1341 struct uac_fu_params *fu;
1342 char ctrl_name[24];
1343 char *direction;
1344
1345 if (!pcm->streams[i].substream_count)
1346 continue;
1347
1348 if (i == SNDRV_PCM_STREAM_PLAYBACK) {
1349 prm = &uac->p_prm;
1350 fu = &params->p_fu;
1351 direction = "Playback";
1352 } else {
1353 prm = &uac->c_prm;
1354 fu = &params->c_fu;
1355 direction = "Capture";
1356 }
1357
1358 prm->fu_id = fu->id;
1359
1360 if (fu->mute_present) {
1361 snprintf(ctrl_name, sizeof(ctrl_name),
1362 "PCM %s Switch", direction);
1363
1364 u_audio_controls[UAC_MUTE_CTRL].name = ctrl_name;
1365
1366 kctl = snd_ctl_new1(&u_audio_controls[UAC_MUTE_CTRL],
1367 prm);
1368 if (!kctl) {
1369 err = -ENOMEM;
1370 goto snd_fail;
1371 }
1372
1373 kctl->id.device = pcm->device;
1374 kctl->id.subdevice = 0;
1375
1376 err = snd_ctl_add(card, kctl);
1377 if (err < 0)
1378 goto snd_fail;
1379 prm->snd_kctl_mute_id = kctl->id;
1380 prm->mute = 0;
1381 }
1382
1383 if (fu->volume_present) {
1384 snprintf(ctrl_name, sizeof(ctrl_name),
1385 "PCM %s Volume", direction);
1386
1387 u_audio_controls[UAC_VOLUME_CTRL].name = ctrl_name;
1388
1389 kctl = snd_ctl_new1(&u_audio_controls[UAC_VOLUME_CTRL],
1390 prm);
1391 if (!kctl) {
1392 err = -ENOMEM;
1393 goto snd_fail;
1394 }
1395
1396 kctl->id.device = pcm->device;
1397 kctl->id.subdevice = 0;
1398
1399
1400 kctl->tlv.c = u_audio_volume_tlv;
1401 kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1402 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1403
1404 err = snd_ctl_add(card, kctl);
1405 if (err < 0)
1406 goto snd_fail;
1407 prm->snd_kctl_volume_id = kctl->id;
1408 prm->volume = fu->volume_max;
1409 prm->volume_max = fu->volume_max;
1410 prm->volume_min = fu->volume_min;
1411 prm->volume_res = fu->volume_res;
1412 }
1413
1414 /* Add rate control */
1415 snprintf(ctrl_name, sizeof(ctrl_name),
1416 "%s Rate", direction);
1417 u_audio_controls[UAC_RATE_CTRL].name = ctrl_name;
1418
1419 kctl = snd_ctl_new1(&u_audio_controls[UAC_RATE_CTRL], prm);
1420 if (!kctl) {
1421 err = -ENOMEM;
1422 goto snd_fail;
1423 }
1424
1425 kctl->id.device = pcm->device;
1426 kctl->id.subdevice = 0;
1427
1428 err = snd_ctl_add(card, kctl);
1429 if (err < 0)
1430 goto snd_fail;
1431 prm->snd_kctl_rate_id = kctl->id;
1432 }
1433
1434 strscpy(card->driver, card_name);
1435 strscpy(card->shortname, card_name);
1436 snprintf(card->longname, sizeof(card->longname), "%s %i",
1437 card_name, card->dev->id);
1438
1439 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
1440 NULL, 0, BUFF_SIZE_MAX);
1441
1442 err = snd_card_register(card);
1443
1444 if (!err)
1445 return 0;
1446
1447snd_fail:
1448 snd_card_free(card);
1449 return err;
1450
1451fail:
1452 kfree(uac->p_prm.reqs);
1453 kfree(uac->c_prm.reqs);
1454 kfree(uac->p_prm.rbuf);
1455 kfree(uac->c_prm.rbuf);
1456 kfree(uac);
1457
1458 return err;
1459}
1460EXPORT_SYMBOL_GPL(g_audio_setup);
1461
1462void g_audio_cleanup(struct g_audio *g_audio)
1463{
1464 struct snd_uac_chip *uac;
1465 struct snd_card *card;
1466
1467 if (!g_audio || !g_audio->uac)
1468 return;
1469
1470 uac = g_audio->uac;
1471 g_audio->uac = NULL;
1472
1473 card = uac->card;
1474 if (card)
1475 snd_card_free_when_closed(card);
1476}
1477EXPORT_SYMBOL_GPL(g_audio_cleanup);
1478
1479MODULE_LICENSE("GPL");
1480MODULE_DESCRIPTION("USB gadget \"ALSA sound card\" utilities");
1481MODULE_AUTHOR("Ruslan Bilovol");