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_P_PITCH_CTRL,
33 UAC_MUTE_CTRL,
34 UAC_VOLUME_CTRL,
35 UAC_RATE_CTRL,
36 };
37
38 /* Runtime data params for one stream */
39 struct 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
74 struct 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
89 static 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
u_audio_set_fback_frequency(enum usb_device_speed speed,struct usb_ep * out_ep,unsigned long long freq,unsigned int pitch,void * buf)100 static 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
u_audio_iso_complete(struct usb_ep * ep,struct usb_request * req)149 static 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
275 exit:
276 if (usb_ep_queue(ep, req, GFP_ATOMIC))
277 dev_err(uac->card->dev, "%d Error!\n", __LINE__);
278 }
279
u_audio_iso_fback_complete(struct usb_ep * ep,struct usb_request * req)280 static 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
uac_pcm_trigger(struct snd_pcm_substream * substream,int cmd)314 static 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
uac_pcm_pointer(struct snd_pcm_substream * substream)353 static 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
uac_ssize_to_fmt(int ssize)366 static 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
uac_pcm_open(struct snd_pcm_substream * substream)385 static 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 */
uac_pcm_null(struct snd_pcm_substream * substream)427 static int uac_pcm_null(struct snd_pcm_substream *substream)
428 {
429 return 0;
430 }
431
432 static 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
free_ep(struct uac_rtd_params * prm,struct usb_ep * ep)440 static 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
free_ep_fback(struct uac_rtd_params * prm,struct usb_ep * ep)473 static 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
set_active(struct uac_rtd_params * prm,bool active)494 static 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
u_audio_set_capture_srate(struct g_audio * audio_dev,int srate)508 int 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 }
531 EXPORT_SYMBOL_GPL(u_audio_set_capture_srate);
532
u_audio_get_capture_srate(struct g_audio * audio_dev,u32 * val)533 int 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 }
545 EXPORT_SYMBOL_GPL(u_audio_get_capture_srate);
546
u_audio_set_playback_srate(struct g_audio * audio_dev,int srate)547 int 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 }
570 EXPORT_SYMBOL_GPL(u_audio_set_playback_srate);
571
u_audio_get_playback_srate(struct g_audio * audio_dev,u32 * val)572 int 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 }
584 EXPORT_SYMBOL_GPL(u_audio_get_playback_srate);
585
u_audio_start_capture(struct g_audio * audio_dev)586 int 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;
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 config_ep_by_speed(gadget, &audio_dev->func, ep);
601 req_len = ep->maxpacket;
602
603 prm->ep_enabled = true;
604 usb_ep_enable(ep);
605
606 for (i = 0; i < params->req_number; i++) {
607 if (!prm->reqs[i]) {
608 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
609 if (req == NULL)
610 return -ENOMEM;
611
612 prm->reqs[i] = req;
613
614 req->zero = 0;
615 req->context = prm;
616 req->length = req_len;
617 req->complete = u_audio_iso_complete;
618 req->buf = prm->rbuf + i * ep->maxpacket;
619 }
620
621 if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC))
622 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
623 }
624
625 set_active(&uac->c_prm, true);
626
627 ep_fback = audio_dev->in_ep_fback;
628 if (!ep_fback)
629 return 0;
630
631 /* Setup feedback endpoint */
632 config_ep_by_speed(gadget, &audio_dev->func, ep_fback);
633 prm->fb_ep_enabled = true;
634 usb_ep_enable(ep_fback);
635 req_len = ep_fback->maxpacket;
636
637 req_fback = usb_ep_alloc_request(ep_fback, GFP_ATOMIC);
638 if (req_fback == NULL)
639 return -ENOMEM;
640
641 prm->req_fback = req_fback;
642 req_fback->zero = 0;
643 req_fback->context = prm;
644 req_fback->length = req_len;
645 req_fback->complete = u_audio_iso_fback_complete;
646
647 req_fback->buf = kzalloc(req_len, GFP_ATOMIC);
648 if (!req_fback->buf)
649 return -ENOMEM;
650
651 /*
652 * Configure the feedback endpoint's reported frequency.
653 * Always start with original frequency since its deviation can't
654 * be meauserd at start of playback
655 */
656 prm->pitch = 1000000;
657 u_audio_set_fback_frequency(audio_dev->gadget->speed, ep,
658 prm->srate, prm->pitch,
659 req_fback->buf);
660
661 if (usb_ep_queue(ep_fback, req_fback, GFP_ATOMIC))
662 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
663
664 return 0;
665 }
666 EXPORT_SYMBOL_GPL(u_audio_start_capture);
667
u_audio_stop_capture(struct g_audio * audio_dev)668 void u_audio_stop_capture(struct g_audio *audio_dev)
669 {
670 struct snd_uac_chip *uac = audio_dev->uac;
671
672 set_active(&uac->c_prm, false);
673 if (audio_dev->in_ep_fback)
674 free_ep_fback(&uac->c_prm, audio_dev->in_ep_fback);
675 free_ep(&uac->c_prm, audio_dev->out_ep);
676 }
677 EXPORT_SYMBOL_GPL(u_audio_stop_capture);
678
u_audio_start_playback(struct g_audio * audio_dev)679 int u_audio_start_playback(struct g_audio *audio_dev)
680 {
681 struct snd_uac_chip *uac = audio_dev->uac;
682 struct usb_gadget *gadget = audio_dev->gadget;
683 struct device *dev = &gadget->dev;
684 struct usb_request *req;
685 struct usb_ep *ep;
686 struct uac_rtd_params *prm;
687 struct uac_params *params = &audio_dev->params;
688 unsigned int factor;
689 const struct usb_endpoint_descriptor *ep_desc;
690 int req_len, i;
691 unsigned int p_pktsize;
692
693 prm = &uac->p_prm;
694 dev_dbg(dev, "start playback with rate %d\n", prm->srate);
695 ep = audio_dev->in_ep;
696 config_ep_by_speed(gadget, &audio_dev->func, ep);
697
698 ep_desc = ep->desc;
699 /*
700 * Always start with original frequency
701 */
702 prm->pitch = 1000000;
703
704 /* pre-calculate the playback endpoint's interval */
705 if (gadget->speed == USB_SPEED_FULL)
706 factor = 1000;
707 else
708 factor = 8000;
709
710 /* pre-compute some values for iso_complete() */
711 uac->p_framesize = params->p_ssize *
712 num_channels(params->p_chmask);
713 uac->p_interval = factor / (1 << (ep_desc->bInterval - 1));
714 p_pktsize = min_t(unsigned int,
715 uac->p_framesize *
716 (prm->srate / uac->p_interval),
717 ep->maxpacket);
718
719 req_len = p_pktsize;
720 uac->p_residue_mil = 0;
721
722 prm->ep_enabled = true;
723 usb_ep_enable(ep);
724
725 for (i = 0; i < params->req_number; i++) {
726 if (!prm->reqs[i]) {
727 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
728 if (req == NULL)
729 return -ENOMEM;
730
731 prm->reqs[i] = req;
732
733 req->zero = 0;
734 req->context = prm;
735 req->length = req_len;
736 req->complete = u_audio_iso_complete;
737 req->buf = prm->rbuf + i * ep->maxpacket;
738 }
739
740 if (usb_ep_queue(ep, prm->reqs[i], GFP_ATOMIC))
741 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
742 }
743
744 set_active(&uac->p_prm, true);
745
746 return 0;
747 }
748 EXPORT_SYMBOL_GPL(u_audio_start_playback);
749
u_audio_stop_playback(struct g_audio * audio_dev)750 void u_audio_stop_playback(struct g_audio *audio_dev)
751 {
752 struct snd_uac_chip *uac = audio_dev->uac;
753
754 set_active(&uac->p_prm, false);
755 free_ep(&uac->p_prm, audio_dev->in_ep);
756 }
757 EXPORT_SYMBOL_GPL(u_audio_stop_playback);
758
u_audio_suspend(struct g_audio * audio_dev)759 void u_audio_suspend(struct g_audio *audio_dev)
760 {
761 struct snd_uac_chip *uac = audio_dev->uac;
762
763 set_active(&uac->p_prm, false);
764 set_active(&uac->c_prm, false);
765 }
766 EXPORT_SYMBOL_GPL(u_audio_suspend);
767
u_audio_get_volume(struct g_audio * audio_dev,int playback,s16 * val)768 int u_audio_get_volume(struct g_audio *audio_dev, int playback, s16 *val)
769 {
770 struct snd_uac_chip *uac = audio_dev->uac;
771 struct uac_rtd_params *prm;
772 unsigned long flags;
773
774 if (playback)
775 prm = &uac->p_prm;
776 else
777 prm = &uac->c_prm;
778
779 spin_lock_irqsave(&prm->lock, flags);
780 *val = prm->volume;
781 spin_unlock_irqrestore(&prm->lock, flags);
782
783 return 0;
784 }
785 EXPORT_SYMBOL_GPL(u_audio_get_volume);
786
u_audio_set_volume(struct g_audio * audio_dev,int playback,s16 val)787 int u_audio_set_volume(struct g_audio *audio_dev, int playback, s16 val)
788 {
789 struct snd_uac_chip *uac = audio_dev->uac;
790 struct uac_rtd_params *prm;
791 unsigned long flags;
792 int change = 0;
793
794 if (playback)
795 prm = &uac->p_prm;
796 else
797 prm = &uac->c_prm;
798
799 spin_lock_irqsave(&prm->lock, flags);
800 val = clamp(val, prm->volume_min, prm->volume_max);
801 if (prm->volume != val) {
802 prm->volume = val;
803 change = 1;
804 }
805 spin_unlock_irqrestore(&prm->lock, flags);
806
807 if (change)
808 snd_ctl_notify(uac->card, SNDRV_CTL_EVENT_MASK_VALUE,
809 &prm->snd_kctl_volume_id);
810
811 return 0;
812 }
813 EXPORT_SYMBOL_GPL(u_audio_set_volume);
814
u_audio_get_mute(struct g_audio * audio_dev,int playback,int * val)815 int u_audio_get_mute(struct g_audio *audio_dev, int playback, int *val)
816 {
817 struct snd_uac_chip *uac = audio_dev->uac;
818 struct uac_rtd_params *prm;
819 unsigned long flags;
820
821 if (playback)
822 prm = &uac->p_prm;
823 else
824 prm = &uac->c_prm;
825
826 spin_lock_irqsave(&prm->lock, flags);
827 *val = prm->mute;
828 spin_unlock_irqrestore(&prm->lock, flags);
829
830 return 0;
831 }
832 EXPORT_SYMBOL_GPL(u_audio_get_mute);
833
u_audio_set_mute(struct g_audio * audio_dev,int playback,int val)834 int u_audio_set_mute(struct g_audio *audio_dev, int playback, int val)
835 {
836 struct snd_uac_chip *uac = audio_dev->uac;
837 struct uac_rtd_params *prm;
838 unsigned long flags;
839 int change = 0;
840 int mute;
841
842 if (playback)
843 prm = &uac->p_prm;
844 else
845 prm = &uac->c_prm;
846
847 mute = val ? 1 : 0;
848
849 spin_lock_irqsave(&prm->lock, flags);
850 if (prm->mute != mute) {
851 prm->mute = mute;
852 change = 1;
853 }
854 spin_unlock_irqrestore(&prm->lock, flags);
855
856 if (change)
857 snd_ctl_notify(uac->card, SNDRV_CTL_EVENT_MASK_VALUE,
858 &prm->snd_kctl_mute_id);
859
860 return 0;
861 }
862 EXPORT_SYMBOL_GPL(u_audio_set_mute);
863
864
u_audio_pitch_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)865 static int u_audio_pitch_info(struct snd_kcontrol *kcontrol,
866 struct snd_ctl_elem_info *uinfo)
867 {
868 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
869 struct snd_uac_chip *uac = prm->uac;
870 struct g_audio *audio_dev = uac->audio_dev;
871 struct uac_params *params = &audio_dev->params;
872 unsigned int pitch_min, pitch_max;
873
874 pitch_min = (1000 - FBACK_SLOW_MAX) * 1000;
875 pitch_max = (1000 + params->fb_max) * 1000;
876
877 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
878 uinfo->count = 1;
879 uinfo->value.integer.min = pitch_min;
880 uinfo->value.integer.max = pitch_max;
881 uinfo->value.integer.step = 1;
882 return 0;
883 }
884
u_audio_pitch_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)885 static int u_audio_pitch_get(struct snd_kcontrol *kcontrol,
886 struct snd_ctl_elem_value *ucontrol)
887 {
888 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
889
890 ucontrol->value.integer.value[0] = prm->pitch;
891
892 return 0;
893 }
894
u_audio_pitch_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)895 static int u_audio_pitch_put(struct snd_kcontrol *kcontrol,
896 struct snd_ctl_elem_value *ucontrol)
897 {
898 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
899 struct snd_uac_chip *uac = prm->uac;
900 struct g_audio *audio_dev = uac->audio_dev;
901 struct uac_params *params = &audio_dev->params;
902 unsigned int val;
903 unsigned int pitch_min, pitch_max;
904 int change = 0;
905
906 pitch_min = (1000 - FBACK_SLOW_MAX) * 1000;
907 pitch_max = (1000 + params->fb_max) * 1000;
908
909 val = ucontrol->value.integer.value[0];
910
911 if (val < pitch_min)
912 val = pitch_min;
913 if (val > pitch_max)
914 val = pitch_max;
915
916 if (prm->pitch != val) {
917 prm->pitch = val;
918 change = 1;
919 }
920
921 return change;
922 }
923
u_audio_mute_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)924 static int u_audio_mute_info(struct snd_kcontrol *kcontrol,
925 struct snd_ctl_elem_info *uinfo)
926 {
927 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
928 uinfo->count = 1;
929 uinfo->value.integer.min = 0;
930 uinfo->value.integer.max = 1;
931 uinfo->value.integer.step = 1;
932
933 return 0;
934 }
935
u_audio_mute_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)936 static int u_audio_mute_get(struct snd_kcontrol *kcontrol,
937 struct snd_ctl_elem_value *ucontrol)
938 {
939 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
940 unsigned long flags;
941
942 spin_lock_irqsave(&prm->lock, flags);
943 ucontrol->value.integer.value[0] = !prm->mute;
944 spin_unlock_irqrestore(&prm->lock, flags);
945
946 return 0;
947 }
948
u_audio_mute_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)949 static int u_audio_mute_put(struct snd_kcontrol *kcontrol,
950 struct snd_ctl_elem_value *ucontrol)
951 {
952 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
953 struct snd_uac_chip *uac = prm->uac;
954 struct g_audio *audio_dev = uac->audio_dev;
955 unsigned int val;
956 unsigned long flags;
957 int change = 0;
958
959 val = !ucontrol->value.integer.value[0];
960
961 spin_lock_irqsave(&prm->lock, flags);
962 if (val != prm->mute) {
963 prm->mute = val;
964 change = 1;
965 }
966 spin_unlock_irqrestore(&prm->lock, flags);
967
968 if (change && audio_dev->notify)
969 audio_dev->notify(audio_dev, prm->fu_id, UAC_FU_MUTE);
970
971 return change;
972 }
973
974 /*
975 * TLV callback for mixer volume controls
976 */
u_audio_volume_tlv(struct snd_kcontrol * kcontrol,int op_flag,unsigned int size,unsigned int __user * _tlv)977 static int u_audio_volume_tlv(struct snd_kcontrol *kcontrol, int op_flag,
978 unsigned int size, unsigned int __user *_tlv)
979 {
980 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
981 DECLARE_TLV_DB_MINMAX(scale, 0, 0);
982
983 if (size < sizeof(scale))
984 return -ENOMEM;
985
986 /* UAC volume resolution is 1/256 dB, TLV is 1/100 dB */
987 scale[2] = (prm->volume_min * 100) / 256;
988 scale[3] = (prm->volume_max * 100) / 256;
989 if (copy_to_user(_tlv, scale, sizeof(scale)))
990 return -EFAULT;
991
992 return 0;
993 }
994
u_audio_volume_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)995 static int u_audio_volume_info(struct snd_kcontrol *kcontrol,
996 struct snd_ctl_elem_info *uinfo)
997 {
998 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
999
1000 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1001 uinfo->count = 1;
1002 uinfo->value.integer.min = 0;
1003 uinfo->value.integer.max =
1004 (prm->volume_max - prm->volume_min + prm->volume_res - 1)
1005 / prm->volume_res;
1006 uinfo->value.integer.step = 1;
1007
1008 return 0;
1009 }
1010
u_audio_volume_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)1011 static int u_audio_volume_get(struct snd_kcontrol *kcontrol,
1012 struct snd_ctl_elem_value *ucontrol)
1013 {
1014 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
1015 unsigned long flags;
1016
1017 spin_lock_irqsave(&prm->lock, flags);
1018 ucontrol->value.integer.value[0] =
1019 (prm->volume - prm->volume_min) / prm->volume_res;
1020 spin_unlock_irqrestore(&prm->lock, flags);
1021
1022 return 0;
1023 }
1024
u_audio_volume_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)1025 static int u_audio_volume_put(struct snd_kcontrol *kcontrol,
1026 struct snd_ctl_elem_value *ucontrol)
1027 {
1028 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
1029 struct snd_uac_chip *uac = prm->uac;
1030 struct g_audio *audio_dev = uac->audio_dev;
1031 unsigned int val;
1032 s16 volume;
1033 unsigned long flags;
1034 int change = 0;
1035
1036 val = ucontrol->value.integer.value[0];
1037
1038 spin_lock_irqsave(&prm->lock, flags);
1039 volume = (val * prm->volume_res) + prm->volume_min;
1040 volume = clamp(volume, prm->volume_min, prm->volume_max);
1041 if (volume != prm->volume) {
1042 prm->volume = volume;
1043 change = 1;
1044 }
1045 spin_unlock_irqrestore(&prm->lock, flags);
1046
1047 if (change && audio_dev->notify)
1048 audio_dev->notify(audio_dev, prm->fu_id, UAC_FU_VOLUME);
1049
1050 return change;
1051 }
1052
get_max_srate(const int * srates)1053 static int get_max_srate(const int *srates)
1054 {
1055 int i, max_srate = 0;
1056
1057 for (i = 0; i < UAC_MAX_RATES; i++) {
1058 if (srates[i] == 0)
1059 break;
1060 if (srates[i] > max_srate)
1061 max_srate = srates[i];
1062 }
1063 return max_srate;
1064 }
1065
get_min_srate(const int * srates)1066 static int get_min_srate(const int *srates)
1067 {
1068 int i, min_srate = INT_MAX;
1069
1070 for (i = 0; i < UAC_MAX_RATES; i++) {
1071 if (srates[i] == 0)
1072 break;
1073 if (srates[i] < min_srate)
1074 min_srate = srates[i];
1075 }
1076 return min_srate;
1077 }
1078
u_audio_rate_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)1079 static int u_audio_rate_info(struct snd_kcontrol *kcontrol,
1080 struct snd_ctl_elem_info *uinfo)
1081 {
1082 const int *srates;
1083 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
1084 struct snd_uac_chip *uac = prm->uac;
1085 struct g_audio *audio_dev = uac->audio_dev;
1086 struct uac_params *params = &audio_dev->params;
1087
1088 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1089 uinfo->count = 1;
1090
1091 if (prm == &uac->c_prm)
1092 srates = params->c_srates;
1093 else
1094 srates = params->p_srates;
1095 uinfo->value.integer.min = get_min_srate(srates);
1096 uinfo->value.integer.max = get_max_srate(srates);
1097 return 0;
1098 }
1099
u_audio_rate_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)1100 static int u_audio_rate_get(struct snd_kcontrol *kcontrol,
1101 struct snd_ctl_elem_value *ucontrol)
1102 {
1103 struct uac_rtd_params *prm = snd_kcontrol_chip(kcontrol);
1104 unsigned long flags;
1105
1106 spin_lock_irqsave(&prm->lock, flags);
1107 if (prm->active)
1108 ucontrol->value.integer.value[0] = prm->srate;
1109 else
1110 /* not active: reporting zero rate */
1111 ucontrol->value.integer.value[0] = 0;
1112 spin_unlock_irqrestore(&prm->lock, flags);
1113 return 0;
1114 }
1115
1116 static struct snd_kcontrol_new u_audio_controls[] = {
1117 [UAC_FBACK_CTRL] {
1118 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
1119 .name = "Capture Pitch 1000000",
1120 .info = u_audio_pitch_info,
1121 .get = u_audio_pitch_get,
1122 .put = u_audio_pitch_put,
1123 },
1124 [UAC_P_PITCH_CTRL] {
1125 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
1126 .name = "Playback Pitch 1000000",
1127 .info = u_audio_pitch_info,
1128 .get = u_audio_pitch_get,
1129 .put = u_audio_pitch_put,
1130 },
1131 [UAC_MUTE_CTRL] {
1132 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1133 .name = "", /* will be filled later */
1134 .info = u_audio_mute_info,
1135 .get = u_audio_mute_get,
1136 .put = u_audio_mute_put,
1137 },
1138 [UAC_VOLUME_CTRL] {
1139 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1140 .name = "", /* will be filled later */
1141 .info = u_audio_volume_info,
1142 .get = u_audio_volume_get,
1143 .put = u_audio_volume_put,
1144 },
1145 [UAC_RATE_CTRL] {
1146 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
1147 .name = "", /* will be filled later */
1148 .access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
1149 .info = u_audio_rate_info,
1150 .get = u_audio_rate_get,
1151 },
1152 };
1153
g_audio_setup(struct g_audio * g_audio,const char * pcm_name,const char * card_name)1154 int g_audio_setup(struct g_audio *g_audio, const char *pcm_name,
1155 const char *card_name)
1156 {
1157 struct snd_uac_chip *uac;
1158 struct snd_card *card;
1159 struct snd_pcm *pcm;
1160 struct snd_kcontrol *kctl;
1161 struct uac_params *params;
1162 int p_chmask, c_chmask;
1163 int i, err;
1164
1165 if (!g_audio)
1166 return -EINVAL;
1167
1168 uac = kzalloc(sizeof(*uac), GFP_KERNEL);
1169 if (!uac)
1170 return -ENOMEM;
1171 g_audio->uac = uac;
1172 uac->audio_dev = g_audio;
1173
1174 params = &g_audio->params;
1175 p_chmask = params->p_chmask;
1176 c_chmask = params->c_chmask;
1177
1178 if (c_chmask) {
1179 struct uac_rtd_params *prm = &uac->c_prm;
1180
1181 spin_lock_init(&prm->lock);
1182 uac->c_prm.uac = uac;
1183 prm->max_psize = g_audio->out_ep_maxpsize;
1184 prm->srate = params->c_srates[0];
1185
1186 prm->reqs = kcalloc(params->req_number,
1187 sizeof(struct usb_request *),
1188 GFP_KERNEL);
1189 if (!prm->reqs) {
1190 err = -ENOMEM;
1191 goto fail;
1192 }
1193
1194 prm->rbuf = kcalloc(params->req_number, prm->max_psize,
1195 GFP_KERNEL);
1196 if (!prm->rbuf) {
1197 prm->max_psize = 0;
1198 err = -ENOMEM;
1199 goto fail;
1200 }
1201 }
1202
1203 if (p_chmask) {
1204 struct uac_rtd_params *prm = &uac->p_prm;
1205
1206 spin_lock_init(&prm->lock);
1207 uac->p_prm.uac = uac;
1208 prm->max_psize = g_audio->in_ep_maxpsize;
1209 prm->srate = params->p_srates[0];
1210
1211 prm->reqs = kcalloc(params->req_number,
1212 sizeof(struct usb_request *),
1213 GFP_KERNEL);
1214 if (!prm->reqs) {
1215 err = -ENOMEM;
1216 goto fail;
1217 }
1218
1219 prm->rbuf = kcalloc(params->req_number, prm->max_psize,
1220 GFP_KERNEL);
1221 if (!prm->rbuf) {
1222 prm->max_psize = 0;
1223 err = -ENOMEM;
1224 goto fail;
1225 }
1226 }
1227
1228 /* Choose any slot, with no id */
1229 err = snd_card_new(&g_audio->gadget->dev,
1230 -1, NULL, THIS_MODULE, 0, &card);
1231 if (err < 0)
1232 goto fail;
1233
1234 uac->card = card;
1235
1236 /*
1237 * Create first PCM device
1238 * Create a substream only for non-zero channel streams
1239 */
1240 err = snd_pcm_new(uac->card, pcm_name, 0,
1241 p_chmask ? 1 : 0, c_chmask ? 1 : 0, &pcm);
1242 if (err < 0)
1243 goto snd_fail;
1244
1245 strscpy(pcm->name, pcm_name, sizeof(pcm->name));
1246 pcm->private_data = uac;
1247 uac->pcm = pcm;
1248
1249 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &uac_pcm_ops);
1250 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &uac_pcm_ops);
1251
1252 /*
1253 * Create mixer and controls
1254 * Create only if it's required on USB side
1255 */
1256 if ((c_chmask && g_audio->in_ep_fback)
1257 || (p_chmask && params->p_fu.id)
1258 || (c_chmask && params->c_fu.id))
1259 strscpy(card->mixername, card_name, sizeof(card->driver));
1260
1261 if (c_chmask && g_audio->in_ep_fback) {
1262 kctl = snd_ctl_new1(&u_audio_controls[UAC_FBACK_CTRL],
1263 &uac->c_prm);
1264 if (!kctl) {
1265 err = -ENOMEM;
1266 goto snd_fail;
1267 }
1268
1269 kctl->id.device = pcm->device;
1270 kctl->id.subdevice = 0;
1271
1272 err = snd_ctl_add(card, kctl);
1273 if (err < 0)
1274 goto snd_fail;
1275 }
1276
1277 if (p_chmask) {
1278 kctl = snd_ctl_new1(&u_audio_controls[UAC_P_PITCH_CTRL],
1279 &uac->p_prm);
1280 if (!kctl) {
1281 err = -ENOMEM;
1282 goto snd_fail;
1283 }
1284
1285 kctl->id.device = pcm->device;
1286 kctl->id.subdevice = 0;
1287
1288 err = snd_ctl_add(card, kctl);
1289 if (err < 0)
1290 goto snd_fail;
1291 }
1292
1293 for (i = 0; i <= SNDRV_PCM_STREAM_LAST; i++) {
1294 struct uac_rtd_params *prm;
1295 struct uac_fu_params *fu;
1296 char ctrl_name[24];
1297 char *direction;
1298
1299 if (!pcm->streams[i].substream_count)
1300 continue;
1301
1302 if (i == SNDRV_PCM_STREAM_PLAYBACK) {
1303 prm = &uac->p_prm;
1304 fu = ¶ms->p_fu;
1305 direction = "Playback";
1306 } else {
1307 prm = &uac->c_prm;
1308 fu = ¶ms->c_fu;
1309 direction = "Capture";
1310 }
1311
1312 prm->fu_id = fu->id;
1313
1314 if (fu->mute_present) {
1315 snprintf(ctrl_name, sizeof(ctrl_name),
1316 "PCM %s Switch", direction);
1317
1318 u_audio_controls[UAC_MUTE_CTRL].name = ctrl_name;
1319
1320 kctl = snd_ctl_new1(&u_audio_controls[UAC_MUTE_CTRL],
1321 prm);
1322 if (!kctl) {
1323 err = -ENOMEM;
1324 goto snd_fail;
1325 }
1326
1327 kctl->id.device = pcm->device;
1328 kctl->id.subdevice = 0;
1329
1330 err = snd_ctl_add(card, kctl);
1331 if (err < 0)
1332 goto snd_fail;
1333 prm->snd_kctl_mute_id = kctl->id;
1334 prm->mute = 0;
1335 }
1336
1337 if (fu->volume_present) {
1338 snprintf(ctrl_name, sizeof(ctrl_name),
1339 "PCM %s Volume", direction);
1340
1341 u_audio_controls[UAC_VOLUME_CTRL].name = ctrl_name;
1342
1343 kctl = snd_ctl_new1(&u_audio_controls[UAC_VOLUME_CTRL],
1344 prm);
1345 if (!kctl) {
1346 err = -ENOMEM;
1347 goto snd_fail;
1348 }
1349
1350 kctl->id.device = pcm->device;
1351 kctl->id.subdevice = 0;
1352
1353
1354 kctl->tlv.c = u_audio_volume_tlv;
1355 kctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1356 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1357
1358 err = snd_ctl_add(card, kctl);
1359 if (err < 0)
1360 goto snd_fail;
1361 prm->snd_kctl_volume_id = kctl->id;
1362 prm->volume = fu->volume_max;
1363 prm->volume_max = fu->volume_max;
1364 prm->volume_min = fu->volume_min;
1365 prm->volume_res = fu->volume_res;
1366 }
1367
1368 /* Add rate control */
1369 snprintf(ctrl_name, sizeof(ctrl_name),
1370 "%s Rate", direction);
1371 u_audio_controls[UAC_RATE_CTRL].name = ctrl_name;
1372
1373 kctl = snd_ctl_new1(&u_audio_controls[UAC_RATE_CTRL], prm);
1374 if (!kctl) {
1375 err = -ENOMEM;
1376 goto snd_fail;
1377 }
1378
1379 kctl->id.device = pcm->device;
1380 kctl->id.subdevice = 0;
1381
1382 err = snd_ctl_add(card, kctl);
1383 if (err < 0)
1384 goto snd_fail;
1385 prm->snd_kctl_rate_id = kctl->id;
1386 }
1387
1388 strscpy(card->driver, card_name, sizeof(card->driver));
1389 strscpy(card->shortname, card_name, sizeof(card->shortname));
1390 sprintf(card->longname, "%s %i", card_name, card->dev->id);
1391
1392 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
1393 NULL, 0, BUFF_SIZE_MAX);
1394
1395 err = snd_card_register(card);
1396
1397 if (!err)
1398 return 0;
1399
1400 snd_fail:
1401 snd_card_free(card);
1402 fail:
1403 kfree(uac->p_prm.reqs);
1404 kfree(uac->c_prm.reqs);
1405 kfree(uac->p_prm.rbuf);
1406 kfree(uac->c_prm.rbuf);
1407 kfree(uac);
1408
1409 return err;
1410 }
1411 EXPORT_SYMBOL_GPL(g_audio_setup);
1412
g_audio_cleanup(struct g_audio * g_audio)1413 void g_audio_cleanup(struct g_audio *g_audio)
1414 {
1415 struct snd_uac_chip *uac;
1416 struct snd_card *card;
1417
1418 if (!g_audio || !g_audio->uac)
1419 return;
1420
1421 uac = g_audio->uac;
1422 g_audio->uac = NULL;
1423
1424 card = uac->card;
1425 if (card)
1426 snd_card_free_when_closed(card);
1427
1428 kfree(uac->p_prm.reqs);
1429 kfree(uac->c_prm.reqs);
1430 kfree(uac->p_prm.rbuf);
1431 kfree(uac->c_prm.rbuf);
1432 kfree(uac);
1433 }
1434 EXPORT_SYMBOL_GPL(g_audio_cleanup);
1435
1436 MODULE_LICENSE("GPL");
1437 MODULE_DESCRIPTION("USB gadget \"ALSA sound card\" utilities");
1438 MODULE_AUTHOR("Ruslan Bilovol");
1439