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ALSA: aloop: Describe units of variables
[linux-2.6-block.git] / sound / drivers / aloop.c
CommitLineData
1a59d1b8 1// SPDX-License-Identifier: GPL-2.0-or-later
597603d6
JK		 2/*
3 * Loopback soundcard
4 *
5 * Original code:
6 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
7 *
8 * More accurate positioning and full-duplex support:
9 * Copyright (c) Ahmet İnan <ainan at mathematik.uni-freiburg.de>
10 *
11 * Major (almost complete) rewrite:
12 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
13 *
14 * A next major update in 2010 (separate timers for playback and capture):
15 * Copyright (c) Jaroslav Kysela <perex@perex.cz>
597603d6
JK		 16 */
17
18#include <linux/init.h>
19#include <linux/jiffies.h>
20#include <linux/slab.h>
21#include <linux/time.h>
22#include <linux/wait.h>
65a77217 23#include <linux/module.h>
597603d6
JK		 24#include <linux/platform_device.h>
25#include <sound/core.h>
26#include <sound/control.h>
27#include <sound/pcm.h>
b088b53e 28#include <sound/pcm_params.h>
e74670b6 29#include <sound/info.h>
597603d6
JK		 30#include <sound/initval.h>
31
32MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
33MODULE_DESCRIPTION("A loopback soundcard");
34MODULE_LICENSE("GPL");
35MODULE_SUPPORTED_DEVICE("{{ALSA,Loopback soundcard}}");
36
37#define MAX_PCM_SUBSTREAMS 8
38
39static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
40static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
a67ff6a5 41static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
597603d6
JK		 42static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
43static int pcm_notify[SNDRV_CARDS];
44
45module_param_array(index, int, NULL, 0444);
46MODULE_PARM_DESC(index, "Index value for loopback soundcard.");
47module_param_array(id, charp, NULL, 0444);
48MODULE_PARM_DESC(id, "ID string for loopback soundcard.");
49module_param_array(enable, bool, NULL, 0444);
50MODULE_PARM_DESC(enable, "Enable this loopback soundcard.");
51module_param_array(pcm_substreams, int, NULL, 0444);
52MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for loopback driver.");
53module_param_array(pcm_notify, int, NULL, 0444);
54MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels changes.");
55
56#define NO_PITCH 100000
57
58struct loopback_pcm;
59
60struct loopback_cable {
61 spinlock_t lock;
62 struct loopback_pcm *streams[2];
63 struct snd_pcm_hardware hw;
64 /* flags */
65 unsigned int valid;
66 unsigned int running;
5de9e45f 67 unsigned int pause;
597603d6
JK		 68};
69
70struct loopback_setup {
71 unsigned int notify: 1;
72 unsigned int rate_shift;
73 unsigned int format;
74 unsigned int rate;
75 unsigned int channels;
76 struct snd_ctl_elem_id active_id;
77 struct snd_ctl_elem_id format_id;
78 struct snd_ctl_elem_id rate_id;
79 struct snd_ctl_elem_id channels_id;
80};
81
82struct loopback {
83 struct snd_card *card;
84 struct mutex cable_lock;
85 struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2];
86 struct snd_pcm *pcm[2];
87 struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2];
88};
89
90struct loopback_pcm {
91 struct loopback *loopback;
92 struct snd_pcm_substream *substream;
93 struct loopback_cable *cable;
94 unsigned int pcm_buffer_size;
95 unsigned int buf_pos; /* position in buffer */
96 unsigned int silent_size;
97 /* PCM parameters */
98 unsigned int pcm_period_size;
99 unsigned int pcm_bps; /* bytes per second */
100 unsigned int pcm_salign; /* bytes per sample * channels */
101 unsigned int pcm_rate_shift; /* rate shift value */
102 /* flags */
103 unsigned int period_update_pending :1;
104 /* timer stuff */
97dda3da
TW		 105 unsigned int irq_pos; /* fractional IRQ position in jiffies
106 * ticks
107 */
108 unsigned int period_size_frac; /* period size in jiffies ticks */
b012513c 109 unsigned int last_drift;
597603d6
JK		 110 unsigned long last_jiffies;
111 struct timer_list timer;
112};
113
114static struct platform_device *devices[SNDRV_CARDS];
115
116static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x)
117{
118 if (dpcm->pcm_rate_shift == NO_PITCH) {
119 x /= HZ;
120 } else {
121 x = div_u64(NO_PITCH * (unsigned long long)x,
122 HZ * (unsigned long long)dpcm->pcm_rate_shift);
123 }
124 return x - (x % dpcm->pcm_salign);
125}
126
127static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x)
128{
129 if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */
130 return x * HZ;
131 } else {
132 x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ,
133 NO_PITCH);
134 }
135 return x;
136}
137
138static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm)
139{
140 int device = dpcm->substream->pstr->pcm->device;
141
142 if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
143 device ^= 1;
144 return &dpcm->loopback->setup[dpcm->substream->number][device];
145}
146
147static inline unsigned int get_notify(struct loopback_pcm *dpcm)
148{
149 return get_setup(dpcm)->notify;
150}
151
152static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm)
153{
154 return get_setup(dpcm)->rate_shift;
155}
156
999fc9f6 157/* call in cable->lock */
597603d6
JK		 158static void loopback_timer_start(struct loopback_pcm *dpcm)
159{
160 unsigned long tick;
161 unsigned int rate_shift = get_rate_shift(dpcm);
162
163 if (rate_shift != dpcm->pcm_rate_shift) {
164 dpcm->pcm_rate_shift = rate_shift;
165 dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size);
166 }
0db71023
JK		 167 if (dpcm->period_size_frac <= dpcm->irq_pos) {
168 dpcm->irq_pos %= dpcm->period_size_frac;
169 dpcm->period_update_pending = 1;
170 }
597603d6
JK		 171 tick = dpcm->period_size_frac - dpcm->irq_pos;
172 tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps;
db974553 173 mod_timer(&dpcm->timer, jiffies + tick);
597603d6
JK		 174}
175
999fc9f6 176/* call in cable->lock */
597603d6
JK		 177static inline void loopback_timer_stop(struct loopback_pcm *dpcm)
178{
179 del_timer(&dpcm->timer);
e74670b6 180 dpcm->timer.expires = 0;
597603d6
JK		 181}
182
67a01afa
TI		 183static inline void loopback_timer_stop_sync(struct loopback_pcm *dpcm)
184{
185 del_timer_sync(&dpcm->timer);
186}
187
597603d6
JK		 188#define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK)
189#define CABLE_VALID_CAPTURE (1 << SNDRV_PCM_STREAM_CAPTURE)
190#define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK|CABLE_VALID_CAPTURE)
191
192static int loopback_check_format(struct loopback_cable *cable, int stream)
193{
b1c73fc8 194 struct snd_pcm_runtime *runtime, *cruntime;
597603d6
JK		 195 struct loopback_setup *setup;
196 struct snd_card *card;
197 int check;
198
199 if (cable->valid != CABLE_VALID_BOTH) {
200 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
201 goto __notify;
202 return 0;
203 }
204 runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->
205 substream->runtime;
b1c73fc8
JK		 206 cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]->
207 substream->runtime;
208 check = runtime->format != cruntime->format ||
209 runtime->rate != cruntime->rate ||
210 runtime->channels != cruntime->channels;
597603d6
JK		 211 if (!check)
212 return 0;
213 if (stream == SNDRV_PCM_STREAM_CAPTURE) {
214 return -EIO;
215 } else {
216 snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]->
217 substream, SNDRV_PCM_STATE_DRAINING);
218 __notify:
219 runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->
220 substream->runtime;
221 setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]);
222 card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card;
223 if (setup->format != runtime->format) {
224 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
225 &setup->format_id);
226 setup->format = runtime->format;
227 }
228 if (setup->rate != runtime->rate) {
229 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
230 &setup->rate_id);
231 setup->rate = runtime->rate;
232 }
233 if (setup->channels != runtime->channels) {
234 snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
235 &setup->channels_id);
236 setup->channels = runtime->channels;
237 }
238 }
239 return 0;
240}
241
242static void loopback_active_notify(struct loopback_pcm *dpcm)
243{
244 snd_ctl_notify(dpcm->loopback->card,
245 SNDRV_CTL_EVENT_MASK_VALUE,
246 &get_setup(dpcm)->active_id);
247}
248
249static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
250{
251 struct snd_pcm_runtime *runtime = substream->runtime;
252 struct loopback_pcm *dpcm = runtime->private_data;
253 struct loopback_cable *cable = dpcm->cable;
5de9e45f 254 int err, stream = 1 << substream->stream;
597603d6
JK		 255
256 switch (cmd) {
257 case SNDRV_PCM_TRIGGER_START:
258 err = loopback_check_format(cable, substream->stream);
259 if (err < 0)
260 return err;
261 dpcm->last_jiffies = jiffies;
262 dpcm->pcm_rate_shift = 0;
b012513c 263 dpcm->last_drift = 0;
dd04bb12 264 spin_lock(&cable->lock);
5de9e45f
JK		 265 cable->running |= stream;
266 cable->pause &= ~stream;
dd04bb12 267 loopback_timer_start(dpcm);
999fc9f6 268 spin_unlock(&cable->lock);
597603d6
JK		 269 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
270 loopback_active_notify(dpcm);
271 break;
272 case SNDRV_PCM_TRIGGER_STOP:
dd04bb12 273 spin_lock(&cable->lock);
5de9e45f
JK		 274 cable->running &= ~stream;
275 cable->pause &= ~stream;
597603d6 276 loopback_timer_stop(dpcm);
999fc9f6 277 spin_unlock(&cable->lock);
597603d6
JK		 278 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
279 loopback_active_notify(dpcm);
280 break;
5de9e45f 281 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
edac8943 282 case SNDRV_PCM_TRIGGER_SUSPEND:
5de9e45f
JK		 283 spin_lock(&cable->lock);
284 cable->pause |= stream;
5de9e45f 285 loopback_timer_stop(dpcm);
999fc9f6 286 spin_unlock(&cable->lock);
306a4f3c
RR		 287 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
288 loopback_active_notify(dpcm);
5de9e45f
JK		 289 break;
290 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
edac8943 291 case SNDRV_PCM_TRIGGER_RESUME:
5de9e45f
JK		 292 spin_lock(&cable->lock);
293 dpcm->last_jiffies = jiffies;
294 cable->pause &= ~stream;
5de9e45f 295 loopback_timer_start(dpcm);
999fc9f6 296 spin_unlock(&cable->lock);
306a4f3c
RR		 297 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
298 loopback_active_notify(dpcm);
5de9e45f 299 break;
597603d6
JK		 300 default:
301 return -EINVAL;
302 }
303 return 0;
304}
305
b1c73fc8
JK		 306static void params_change(struct snd_pcm_substream *substream)
307{
308 struct snd_pcm_runtime *runtime = substream->runtime;
309 struct loopback_pcm *dpcm = runtime->private_data;
310 struct loopback_cable *cable = dpcm->cable;
311
74c34ca1 312 cable->hw.formats = pcm_format_to_bits(runtime->format);
b1c73fc8
JK		 313 cable->hw.rate_min = runtime->rate;
314 cable->hw.rate_max = runtime->rate;
315 cable->hw.channels_min = runtime->channels;
316 cable->hw.channels_max = runtime->channels;
b1c73fc8
JK		 317}
318
597603d6
JK		 319static int loopback_prepare(struct snd_pcm_substream *substream)
320{
321 struct snd_pcm_runtime *runtime = substream->runtime;
322 struct loopback_pcm *dpcm = runtime->private_data;
323 struct loopback_cable *cable = dpcm->cable;
b1c73fc8 324 int bps, salign;
597603d6 325
67a01afa
TI		 326 loopback_timer_stop_sync(dpcm);
327
50e09084 328 salign = (snd_pcm_format_physical_width(runtime->format) *
597603d6
JK		 329 runtime->channels) / 8;
330 bps = salign * runtime->rate;
331 if (bps <= 0 || salign <= 0)
332 return -EINVAL;
333
334 dpcm->buf_pos = 0;
335 dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size);
336 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
337 /* clear capture buffer */
338 dpcm->silent_size = dpcm->pcm_buffer_size;
339 snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
340 runtime->buffer_size * runtime->channels);
341 }
342
343 dpcm->irq_pos = 0;
344 dpcm->period_update_pending = 0;
345 dpcm->pcm_bps = bps;
346 dpcm->pcm_salign = salign;
347 dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size);
348
349 mutex_lock(&dpcm->loopback->cable_lock);
b1c73fc8
JK		 350 if (!(cable->valid & ~(1 << substream->stream)) ||
351 (get_setup(dpcm)->notify &&
352 substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
353 params_change(substream);
597603d6
JK		 354 cable->valid |= 1 << substream->stream;
355 mutex_unlock(&dpcm->loopback->cable_lock);
356
357 return 0;
358}
359
360static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes)
361{
362 struct snd_pcm_runtime *runtime = dpcm->substream->runtime;
363 char *dst = runtime->dma_area;
364 unsigned int dst_off = dpcm->buf_pos;
365
366 if (dpcm->silent_size >= dpcm->pcm_buffer_size)
367 return;
368 if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size)
369 bytes = dpcm->pcm_buffer_size - dpcm->silent_size;
370
371 for (;;) {
372 unsigned int size = bytes;
373 if (dst_off + size > dpcm->pcm_buffer_size)
374 size = dpcm->pcm_buffer_size - dst_off;
375 snd_pcm_format_set_silence(runtime->format, dst + dst_off,
376 bytes_to_frames(runtime, size) *
377 runtime->channels);
378 dpcm->silent_size += size;
379 bytes -= size;
380 if (!bytes)
381 break;
382 dst_off = 0;
383 }
384}
385
386static void copy_play_buf(struct loopback_pcm *play,
387 struct loopback_pcm *capt,
388 unsigned int bytes)
389{
390 struct snd_pcm_runtime *runtime = play->substream->runtime;
20d9a26d 391 char *src = runtime->dma_area;
597603d6
JK		 392 char *dst = capt->substream->runtime->dma_area;
393 unsigned int src_off = play->buf_pos;
394 unsigned int dst_off = capt->buf_pos;
395 unsigned int clear_bytes = 0;
396
397 /* check if playback is draining, trim the capture copy size
398 * when our pointer is at the end of playback ring buffer */
399 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
400 snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) {
401 snd_pcm_uframes_t appl_ptr, appl_ptr1, diff;
402 appl_ptr = appl_ptr1 = runtime->control->appl_ptr;
403 appl_ptr1 -= appl_ptr1 % runtime->buffer_size;
404 appl_ptr1 += play->buf_pos / play->pcm_salign;
405 if (appl_ptr < appl_ptr1)
406 appl_ptr1 -= runtime->buffer_size;
407 diff = (appl_ptr - appl_ptr1) * play->pcm_salign;
408 if (diff < bytes) {
409 clear_bytes = bytes - diff;
410 bytes = diff;
411 }
412 }
413
414 for (;;) {
415 unsigned int size = bytes;
416 if (src_off + size > play->pcm_buffer_size)
417 size = play->pcm_buffer_size - src_off;
418 if (dst_off + size > capt->pcm_buffer_size)
419 size = capt->pcm_buffer_size - dst_off;
420 memcpy(dst + dst_off, src + src_off, size);
421 capt->silent_size = 0;
422 bytes -= size;
423 if (!bytes)
424 break;
425 src_off = (src_off + size) % play->pcm_buffer_size;
426 dst_off = (dst_off + size) % capt->pcm_buffer_size;
427 }
428
20d9a26d 429 if (clear_bytes > 0) {
597603d6 430 clear_capture_buf(capt, clear_bytes);
20d9a26d
JK		 431 capt->silent_size = 0;
432 }
597603d6
JK		 433}
434
b012513c
JK		 435static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm,
436 unsigned int jiffies_delta)
597603d6 437{
597603d6 438 unsigned long last_pos;
b012513c 439 unsigned int delta;
597603d6
JK		 440
441 last_pos = byte_pos(dpcm, dpcm->irq_pos);
b012513c
JK		 442 dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps;
443 delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos;
444 if (delta >= dpcm->last_drift)
445 delta -= dpcm->last_drift;
446 dpcm->last_drift = 0;
597603d6
JK		 447 if (dpcm->irq_pos >= dpcm->period_size_frac) {
448 dpcm->irq_pos %= dpcm->period_size_frac;
449 dpcm->period_update_pending = 1;
450 }
b012513c
JK		 451 return delta;
452}
453
454static inline void bytepos_finish(struct loopback_pcm *dpcm,
455 unsigned int delta)
456{
457 dpcm->buf_pos += delta;
458 dpcm->buf_pos %= dpcm->pcm_buffer_size;
597603d6
JK		 459}
460
999fc9f6 461/* call in cable->lock */
dd04bb12 462static unsigned int loopback_pos_update(struct loopback_cable *cable)
597603d6
JK		 463{
464 struct loopback_pcm *dpcm_play =
465 cable->streams[SNDRV_PCM_STREAM_PLAYBACK];
466 struct loopback_pcm *dpcm_capt =
467 cable->streams[SNDRV_PCM_STREAM_CAPTURE];
468 unsigned long delta_play = 0, delta_capt = 0;
b012513c 469 unsigned int running, count1, count2;
597603d6 470
5de9e45f 471 running = cable->running ^ cable->pause;
dd04bb12 472 if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) {
597603d6
JK		 473 delta_play = jiffies - dpcm_play->last_jiffies;
474 dpcm_play->last_jiffies += delta_play;
475 }
476
dd04bb12 477 if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) {
597603d6
JK		 478 delta_capt = jiffies - dpcm_capt->last_jiffies;
479 dpcm_capt->last_jiffies += delta_capt;
480 }
481
98d21df4
TI		 482 if (delta_play == 0 && delta_capt == 0)
483 goto unlock;
597603d6
JK		 484
485 if (delta_play > delta_capt) {
b012513c
JK		 486 count1 = bytepos_delta(dpcm_play, delta_play - delta_capt);
487 bytepos_finish(dpcm_play, count1);
597603d6
JK		 488 delta_play = delta_capt;
489 } else if (delta_play < delta_capt) {
b012513c
JK		 490 count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play);
491 clear_capture_buf(dpcm_capt, count1);
492 bytepos_finish(dpcm_capt, count1);
597603d6
JK		 493 delta_capt = delta_play;
494 }
495
98d21df4
TI		 496 if (delta_play == 0 && delta_capt == 0)
497 goto unlock;
498
597603d6 499 /* note delta_capt == delta_play at this moment */
b012513c
JK		 500 count1 = bytepos_delta(dpcm_play, delta_play);
501 count2 = bytepos_delta(dpcm_capt, delta_capt);
502 if (count1 < count2) {
503 dpcm_capt->last_drift = count2 - count1;
504 count1 = count2;
505 } else if (count1 > count2) {
506 dpcm_play->last_drift = count1 - count2;
507 }
508 copy_play_buf(dpcm_play, dpcm_capt, count1);
509 bytepos_finish(dpcm_play, count1);
510 bytepos_finish(dpcm_capt, count1);
98d21df4 511 unlock:
dd04bb12 512 return running;
597603d6
JK		 513}
514
bc47ba90 515static void loopback_timer_function(struct timer_list *t)
597603d6 516{
bc47ba90 517 struct loopback_pcm *dpcm = from_timer(dpcm, t, timer);
999fc9f6 518 unsigned long flags;
597603d6 519
999fc9f6
TI		 520 spin_lock_irqsave(&dpcm->cable->lock, flags);
521 if (loopback_pos_update(dpcm->cable) & (1 << dpcm->substream->stream)) {
597603d6 522 loopback_timer_start(dpcm);
dd04bb12
JK		 523 if (dpcm->period_update_pending) {
524 dpcm->period_update_pending = 0;
999fc9f6
TI		 525 spin_unlock_irqrestore(&dpcm->cable->lock, flags);
526 /* need to unlock before calling below */
597603d6 527 snd_pcm_period_elapsed(dpcm->substream);
999fc9f6 528 return;
dd04bb12 529 }
597603d6 530 }
999fc9f6 531 spin_unlock_irqrestore(&dpcm->cable->lock, flags);
597603d6
JK		 532}
533
534static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream)
535{
536 struct snd_pcm_runtime *runtime = substream->runtime;
537 struct loopback_pcm *dpcm = runtime->private_data;
999fc9f6 538 snd_pcm_uframes_t pos;
597603d6 539
999fc9f6 540 spin_lock(&dpcm->cable->lock);
597603d6 541 loopback_pos_update(dpcm->cable);
999fc9f6
TI		 542 pos = dpcm->buf_pos;
543 spin_unlock(&dpcm->cable->lock);
544 return bytes_to_frames(runtime, pos);
597603d6
JK		 545}
546
b6c0b715 547static const struct snd_pcm_hardware loopback_pcm_hardware =
597603d6
JK		 548{
549 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP |
edac8943
TI		 550 SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE |
551 SNDRV_PCM_INFO_RESUME),
597603d6 552 .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
50e09084
TW		 553 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |
554 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |
597603d6
JK		 555 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |
556 SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE),
557 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000,
558 .rate_min = 8000,
559 .rate_max = 192000,
560 .channels_min = 1,
561 .channels_max = 32,
562 .buffer_bytes_max = 2 * 1024 * 1024,
563 .period_bytes_min = 64,
0db71023
JK		 564 /* note check overflow in frac_pos() using pcm_rate_shift before
565 changing period_bytes_max value */
566 .period_bytes_max = 1024 * 1024,
597603d6
JK		 567 .periods_min = 1,
568 .periods_max = 1024,
569 .fifo_size = 0,
570};
571
572static void loopback_runtime_free(struct snd_pcm_runtime *runtime)
573{
574 struct loopback_pcm *dpcm = runtime->private_data;
575 kfree(dpcm);
576}
577
578static int loopback_hw_params(struct snd_pcm_substream *substream,
579 struct snd_pcm_hw_params *params)
580{
b29e5ef1 581 return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
597603d6
JK		 582}
583
584static int loopback_hw_free(struct snd_pcm_substream *substream)
585{
586 struct snd_pcm_runtime *runtime = substream->runtime;
587 struct loopback_pcm *dpcm = runtime->private_data;
588 struct loopback_cable *cable = dpcm->cable;
589
590 mutex_lock(&dpcm->loopback->cable_lock);
591 cable->valid &= ~(1 << substream->stream);
592 mutex_unlock(&dpcm->loopback->cable_lock);
b29e5ef1 593 return snd_pcm_lib_free_pages(substream);
597603d6
JK		 594}
595
596static unsigned int get_cable_index(struct snd_pcm_substream *substream)
597{
598 if (!substream->pcm->device)
599 return substream->stream;
600 else
601 return !substream->stream;
602}
603
b1c73fc8
JK		 604static int rule_format(struct snd_pcm_hw_params *params,
605 struct snd_pcm_hw_rule *rule)
606{
898dfe46
TI		 607 struct loopback_pcm *dpcm = rule->private;
608 struct loopback_cable *cable = dpcm->cable;
b088b53e 609 struct snd_mask m;
b1c73fc8 610
b088b53e 611 snd_mask_none(&m);
898dfe46
TI		 612 mutex_lock(&dpcm->loopback->cable_lock);
613 m.bits[0] = (u_int32_t)cable->hw.formats;
614 m.bits[1] = (u_int32_t)(cable->hw.formats >> 32);
615 mutex_unlock(&dpcm->loopback->cable_lock);
b088b53e 616 return snd_mask_refine(hw_param_mask(params, rule->var), &m);
b1c73fc8
JK		 617}
618
619static int rule_rate(struct snd_pcm_hw_params *params,
620 struct snd_pcm_hw_rule *rule)
621{
898dfe46
TI		 622 struct loopback_pcm *dpcm = rule->private;
623 struct loopback_cable *cable = dpcm->cable;
b1c73fc8
JK		 624 struct snd_interval t;
625
898dfe46
TI		 626 mutex_lock(&dpcm->loopback->cable_lock);
627 t.min = cable->hw.rate_min;
628 t.max = cable->hw.rate_max;
629 mutex_unlock(&dpcm->loopback->cable_lock);
b1c73fc8
JK		 630 t.openmin = t.openmax = 0;
631 t.integer = 0;
632 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
633}
634
635static int rule_channels(struct snd_pcm_hw_params *params,
636 struct snd_pcm_hw_rule *rule)
637{
898dfe46
TI		 638 struct loopback_pcm *dpcm = rule->private;
639 struct loopback_cable *cable = dpcm->cable;
b1c73fc8
JK		 640 struct snd_interval t;
641
898dfe46
TI		 642 mutex_lock(&dpcm->loopback->cable_lock);
643 t.min = cable->hw.channels_min;
644 t.max = cable->hw.channels_max;
645 mutex_unlock(&dpcm->loopback->cable_lock);
b1c73fc8
JK		 646 t.openmin = t.openmax = 0;
647 t.integer = 0;
648 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
649}
650
9685347a
TI		 651static void free_cable(struct snd_pcm_substream *substream)
652{
653 struct loopback *loopback = substream->private_data;
654 int dev = get_cable_index(substream);
655 struct loopback_cable *cable;
656
657 cable = loopback->cables[substream->number][dev];
658 if (!cable)
659 return;
660 if (cable->streams[!substream->stream]) {
661 /* other stream is still alive */
8e6b1a72 662 spin_lock_irq(&cable->lock);
9685347a 663 cable->streams[substream->stream] = NULL;
8e6b1a72 664 spin_unlock_irq(&cable->lock);
9685347a
TI		 665 } else {
666 /* free the cable */
667 loopback->cables[substream->number][dev] = NULL;
668 kfree(cable);
669 }
670}
671
597603d6
JK		 672static int loopback_open(struct snd_pcm_substream *substream)
673{
674 struct snd_pcm_runtime *runtime = substream->runtime;
675 struct loopback *loopback = substream->private_data;
676 struct loopback_pcm *dpcm;
9685347a 677 struct loopback_cable *cable = NULL;
597603d6
JK		 678 int err = 0;
679 int dev = get_cable_index(substream);
680
681 mutex_lock(&loopback->cable_lock);
682 dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
683 if (!dpcm) {
684 err = -ENOMEM;
685 goto unlock;
686 }
687 dpcm->loopback = loopback;
688 dpcm->substream = substream;
bc47ba90 689 timer_setup(&dpcm->timer, loopback_timer_function, 0);
597603d6
JK		 690
691 cable = loopback->cables[substream->number][dev];
692 if (!cable) {
693 cable = kzalloc(sizeof(*cable), GFP_KERNEL);
694 if (!cable) {
597603d6
JK		 695 err = -ENOMEM;
696 goto unlock;
697 }
698 spin_lock_init(&cable->lock);
699 cable->hw = loopback_pcm_hardware;
700 loopback->cables[substream->number][dev] = cable;
701 }
702 dpcm->cable = cable;
597603d6
JK		 703
704 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
705
b1c73fc8
JK		 706 /* use dynamic rules based on actual runtime->hw values */
707 /* note that the default rules created in the PCM midlevel code */
708 /* are cached -> they do not reflect the actual state */
709 err = snd_pcm_hw_rule_add(runtime, 0,
710 SNDRV_PCM_HW_PARAM_FORMAT,
898dfe46 711 rule_format, dpcm,
b1c73fc8
JK		 712 SNDRV_PCM_HW_PARAM_FORMAT, -1);
713 if (err < 0)
714 goto unlock;
715 err = snd_pcm_hw_rule_add(runtime, 0,
716 SNDRV_PCM_HW_PARAM_RATE,
898dfe46 717 rule_rate, dpcm,
b1c73fc8
JK		 718 SNDRV_PCM_HW_PARAM_RATE, -1);
719 if (err < 0)
720 goto unlock;
721 err = snd_pcm_hw_rule_add(runtime, 0,
722 SNDRV_PCM_HW_PARAM_CHANNELS,
898dfe46 723 rule_channels, dpcm,
b1c73fc8
JK		 724 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
725 if (err < 0)
726 goto unlock;
727
597603d6
JK		 728 runtime->private_data = dpcm;
729 runtime->private_free = loopback_runtime_free;
b1c73fc8 730 if (get_notify(dpcm))
597603d6 731 runtime->hw = loopback_pcm_hardware;
b1c73fc8 732 else
597603d6 733 runtime->hw = cable->hw;
8e6b1a72
TI		 734
735 spin_lock_irq(&cable->lock);
736 cable->streams[substream->stream] = dpcm;
737 spin_unlock_irq(&cable->lock);
738
597603d6 739 unlock:
9685347a
TI		 740 if (err < 0) {
741 free_cable(substream);
742 kfree(dpcm);
743 }
597603d6
JK		 744 mutex_unlock(&loopback->cable_lock);
745 return err;
746}
747
748static int loopback_close(struct snd_pcm_substream *substream)
749{
750 struct loopback *loopback = substream->private_data;
751 struct loopback_pcm *dpcm = substream->runtime->private_data;
597603d6 752
67a01afa 753 loopback_timer_stop_sync(dpcm);
597603d6 754 mutex_lock(&loopback->cable_lock);
9685347a 755 free_cable(substream);
597603d6
JK		 756 mutex_unlock(&loopback->cable_lock);
757 return 0;
758}
759
9f88058e 760static const struct snd_pcm_ops loopback_pcm_ops = {
597603d6
JK		 761 .open = loopback_open,
762 .close = loopback_close,
763 .ioctl = snd_pcm_lib_ioctl,
764 .hw_params = loopback_hw_params,
765 .hw_free = loopback_hw_free,
766 .prepare = loopback_prepare,
767 .trigger = loopback_trigger,
768 .pointer = loopback_pointer,
769};
770
fbbb01a1
BP		 771static int loopback_pcm_new(struct loopback *loopback,
772 int device, int substreams)
597603d6
JK		 773{
774 struct snd_pcm *pcm;
775 int err;
776
777 err = snd_pcm_new(loopback->card, "Loopback PCM", device,
778 substreams, substreams, &pcm);
779 if (err < 0)
780 return err;
9f88058e
TI		 781 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_pcm_ops);
782 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_pcm_ops);
b29e5ef1
TI		 783 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_VMALLOC,
784 NULL, 0, 0);
597603d6
JK		 785
786 pcm->private_data = loopback;
787 pcm->info_flags = 0;
788 strcpy(pcm->name, "Loopback PCM");
789
790 loopback->pcm[device] = pcm;
597603d6
JK		 791 return 0;
792}
793
794static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol,
795 struct snd_ctl_elem_info *uinfo)
796{
797 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
798 uinfo->count = 1;
799 uinfo->value.integer.min = 80000;
800 uinfo->value.integer.max = 120000;
801 uinfo->value.integer.step = 1;
802 return 0;
803}
804
805static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol,
806 struct snd_ctl_elem_value *ucontrol)
807{
808 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
809
76b3421b 810 mutex_lock(&loopback->cable_lock);
597603d6
JK		 811 ucontrol->value.integer.value[0] =
812 loopback->setup[kcontrol->id.subdevice]
813 [kcontrol->id.device].rate_shift;
76b3421b 814 mutex_unlock(&loopback->cable_lock);
597603d6
JK		 815 return 0;
816}
817
818static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol,
819 struct snd_ctl_elem_value *ucontrol)
820{
821 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
822 unsigned int val;
823 int change = 0;
824
825 val = ucontrol->value.integer.value[0];
826 if (val < 80000)
827 val = 80000;
828 if (val > 120000)
829 val = 120000;
830 mutex_lock(&loopback->cable_lock);
831 if (val != loopback->setup[kcontrol->id.subdevice]
832 [kcontrol->id.device].rate_shift) {
833 loopback->setup[kcontrol->id.subdevice]
834 [kcontrol->id.device].rate_shift = val;
835 change = 1;
836 }
837 mutex_unlock(&loopback->cable_lock);
838 return change;
839}
840
841static int loopback_notify_get(struct snd_kcontrol *kcontrol,
842 struct snd_ctl_elem_value *ucontrol)
843{
844 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
845
76b3421b 846 mutex_lock(&loopback->cable_lock);
597603d6
JK		 847 ucontrol->value.integer.value[0] =
848 loopback->setup[kcontrol->id.subdevice]
849 [kcontrol->id.device].notify;
76b3421b 850 mutex_unlock(&loopback->cable_lock);
597603d6
JK		 851 return 0;
852}
853
854static int loopback_notify_put(struct snd_kcontrol *kcontrol,
855 struct snd_ctl_elem_value *ucontrol)
856{
857 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
858 unsigned int val;
859 int change = 0;
860
861 val = ucontrol->value.integer.value[0] ? 1 : 0;
76b3421b 862 mutex_lock(&loopback->cable_lock);
597603d6
JK		 863 if (val != loopback->setup[kcontrol->id.subdevice]
864 [kcontrol->id.device].notify) {
865 loopback->setup[kcontrol->id.subdevice]
866 [kcontrol->id.device].notify = val;
867 change = 1;
868 }
76b3421b 869 mutex_unlock(&loopback->cable_lock);
597603d6
JK		 870 return change;
871}
872
873static int loopback_active_get(struct snd_kcontrol *kcontrol,
874 struct snd_ctl_elem_value *ucontrol)
875{
876 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
76b3421b
TI		 877 struct loopback_cable *cable;
878
597603d6
JK		 879 unsigned int val = 0;
880
76b3421b
TI		 881 mutex_lock(&loopback->cable_lock);
882 cable = loopback->cables[kcontrol->id.subdevice][kcontrol->id.device ^ 1];
306a4f3c
RR		 883 if (cable != NULL) {
884 unsigned int running = cable->running ^ cable->pause;
885
886 val = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? 1 : 0;
887 }
76b3421b 888 mutex_unlock(&loopback->cable_lock);
597603d6
JK		 889 ucontrol->value.integer.value[0] = val;
890 return 0;
891}
892
893static int loopback_format_info(struct snd_kcontrol *kcontrol,
894 struct snd_ctl_elem_info *uinfo)
895{
896 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
897 uinfo->count = 1;
898 uinfo->value.integer.min = 0;
899 uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST;
900 uinfo->value.integer.step = 1;
901 return 0;
902}
903
904static int loopback_format_get(struct snd_kcontrol *kcontrol,
905 struct snd_ctl_elem_value *ucontrol)
906{
907 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
908
909 ucontrol->value.integer.value[0] =
910 loopback->setup[kcontrol->id.subdevice]
911 [kcontrol->id.device].format;
912 return 0;
913}
914
915static int loopback_rate_info(struct snd_kcontrol *kcontrol,
916 struct snd_ctl_elem_info *uinfo)
917{
918 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
919 uinfo->count = 1;
920 uinfo->value.integer.min = 0;
921 uinfo->value.integer.max = 192000;
922 uinfo->value.integer.step = 1;
923 return 0;
924}
925
926static int loopback_rate_get(struct snd_kcontrol *kcontrol,
927 struct snd_ctl_elem_value *ucontrol)
928{
929 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
930
76b3421b 931 mutex_lock(&loopback->cable_lock);
597603d6
JK		 932 ucontrol->value.integer.value[0] =
933 loopback->setup[kcontrol->id.subdevice]
934 [kcontrol->id.device].rate;
76b3421b 935 mutex_unlock(&loopback->cable_lock);
597603d6
JK		 936 return 0;
937}
938
939static int loopback_channels_info(struct snd_kcontrol *kcontrol,
940 struct snd_ctl_elem_info *uinfo)
941{
942 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
943 uinfo->count = 1;
944 uinfo->value.integer.min = 1;
945 uinfo->value.integer.max = 1024;
946 uinfo->value.integer.step = 1;
947 return 0;
948}
949
950static int loopback_channels_get(struct snd_kcontrol *kcontrol,
951 struct snd_ctl_elem_value *ucontrol)
952{
953 struct loopback *loopback = snd_kcontrol_chip(kcontrol);
954
76b3421b 955 mutex_lock(&loopback->cable_lock);
597603d6
JK		 956 ucontrol->value.integer.value[0] =
957 loopback->setup[kcontrol->id.subdevice]
1446c5fb 958 [kcontrol->id.device].channels;
76b3421b 959 mutex_unlock(&loopback->cable_lock);
597603d6
JK		 960 return 0;
961}
962
fbbb01a1 963static struct snd_kcontrol_new loopback_controls[] = {
597603d6
JK		 964{
965 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
966 .name = "PCM Rate Shift 100000",
967 .info = loopback_rate_shift_info,
968 .get = loopback_rate_shift_get,
969 .put = loopback_rate_shift_put,
970},
971{
972 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
973 .name = "PCM Notify",
974 .info = snd_ctl_boolean_mono_info,
975 .get = loopback_notify_get,
976 .put = loopback_notify_put,
977},
978#define ACTIVE_IDX 2
979{
980 .access = SNDRV_CTL_ELEM_ACCESS_READ,
981 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
982 .name = "PCM Slave Active",
983 .info = snd_ctl_boolean_mono_info,
984 .get = loopback_active_get,
985},
986#define FORMAT_IDX 3
987{
988 .access = SNDRV_CTL_ELEM_ACCESS_READ,
989 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
990 .name = "PCM Slave Format",
991 .info = loopback_format_info,
992 .get = loopback_format_get
993},
994#define RATE_IDX 4
995{
996 .access = SNDRV_CTL_ELEM_ACCESS_READ,
997 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
998 .name = "PCM Slave Rate",
999 .info = loopback_rate_info,
1000 .get = loopback_rate_get
1001},
1002#define CHANNELS_IDX 5
1003{
1004 .access = SNDRV_CTL_ELEM_ACCESS_READ,
1005 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
1006 .name = "PCM Slave Channels",
1007 .info = loopback_channels_info,
1008 .get = loopback_channels_get
1009}
1010};
1011
fbbb01a1 1012static int loopback_mixer_new(struct loopback *loopback, int notify)
597603d6
JK		 1013{
1014 struct snd_card *card = loopback->card;
1015 struct snd_pcm *pcm;
1016 struct snd_kcontrol *kctl;
1017 struct loopback_setup *setup;
1018 int err, dev, substr, substr_count, idx;
1019
1020 strcpy(card->mixername, "Loopback Mixer");
1021 for (dev = 0; dev < 2; dev++) {
1022 pcm = loopback->pcm[dev];
1023 substr_count =
1024 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count;
1025 for (substr = 0; substr < substr_count; substr++) {
1026 setup = &loopback->setup[substr][dev];
1027 setup->notify = notify;
1028 setup->rate_shift = NO_PITCH;
1029 setup->format = SNDRV_PCM_FORMAT_S16_LE;
1030 setup->rate = 48000;
1031 setup->channels = 2;
1032 for (idx = 0; idx < ARRAY_SIZE(loopback_controls);
1033 idx++) {
1034 kctl = snd_ctl_new1(&loopback_controls[idx],
1035 loopback);
1036 if (!kctl)
1037 return -ENOMEM;
1038 kctl->id.device = dev;
1039 kctl->id.subdevice = substr;
1040 switch (idx) {
1041 case ACTIVE_IDX:
1042 setup->active_id = kctl->id;
1043 break;
1044 case FORMAT_IDX:
1045 setup->format_id = kctl->id;
1046 break;
1047 case RATE_IDX:
1048 setup->rate_id = kctl->id;
1049 break;
1050 case CHANNELS_IDX:
1051 setup->channels_id = kctl->id;
1052 break;
1053 default:
1054 break;
1055 }
1056 err = snd_ctl_add(card, kctl);
1057 if (err < 0)
1058 return err;
1059 }
1060 }
1061 }
1062 return 0;
1063}
1064
e74670b6
JK		 1065static void print_dpcm_info(struct snd_info_buffer *buffer,
1066 struct loopback_pcm *dpcm,
1067 const char *id)
1068{
1069 snd_iprintf(buffer, " %s\n", id);
1070 if (dpcm == NULL) {
1071 snd_iprintf(buffer, " inactive\n");
1072 return;
1073 }
1074 snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size);
1075 snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos);
1076 snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size);
1077 snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size);
1078 snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps);
1079 snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign);
1080 snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift);
1081 snd_iprintf(buffer, " update_pending:\t%u\n",
1082 dpcm->period_update_pending);
1083 snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos);
1084 snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac);
1085 snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n",
1086 dpcm->last_jiffies, jiffies);
1087 snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires);
1088}
1089
1090static void print_substream_info(struct snd_info_buffer *buffer,
1091 struct loopback *loopback,
1092 int sub,
1093 int num)
1094{
1095 struct loopback_cable *cable = loopback->cables[sub][num];
1096
1097 snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub);
1098 if (cable == NULL) {
1099 snd_iprintf(buffer, " inactive\n");
1100 return;
1101 }
1102 snd_iprintf(buffer, " valid: %u\n", cable->valid);
1103 snd_iprintf(buffer, " running: %u\n", cable->running);
5de9e45f 1104 snd_iprintf(buffer, " pause: %u\n", cable->pause);
e74670b6
JK		 1105 print_dpcm_info(buffer, cable->streams[0], "Playback");
1106 print_dpcm_info(buffer, cable->streams[1], "Capture");
1107}
1108
1109static void print_cable_info(struct snd_info_entry *entry,
1110 struct snd_info_buffer *buffer)
1111{
1112 struct loopback *loopback = entry->private_data;
1113 int sub, num;
1114
1115 mutex_lock(&loopback->cable_lock);
1116 num = entry->name[strlen(entry->name)-1];
1117 num = num == '0' ? 0 : 1;
1118 for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++)
1119 print_substream_info(buffer, loopback, sub, num);
1120 mutex_unlock(&loopback->cable_lock);
1121}
1122
fbbb01a1 1123static int loopback_proc_new(struct loopback *loopback, int cidx)
e74670b6
JK		 1124{
1125 char name[32];
e74670b6
JK		 1126
1127 snprintf(name, sizeof(name), "cable#%d", cidx);
815d808c
TI		 1128 return snd_card_ro_proc_new(loopback->card, name, loopback,
1129 print_cable_info);
e74670b6
JK		 1130}
1131
fbbb01a1 1132static int loopback_probe(struct platform_device *devptr)
597603d6
JK		 1133{
1134 struct snd_card *card;
1135 struct loopback *loopback;
1136 int dev = devptr->id;
1137 int err;
1138
5872f3f6
TI		 1139 err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1140 sizeof(struct loopback), &card);
597603d6
JK		 1141 if (err < 0)
1142 return err;
1143 loopback = card->private_data;
1144
1145 if (pcm_substreams[dev] < 1)
1146 pcm_substreams[dev] = 1;
1147 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1148 pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1149
1150 loopback->card = card;
1151 mutex_init(&loopback->cable_lock);
1152
1153 err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]);
1154 if (err < 0)
1155 goto __nodev;
1156 err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]);
1157 if (err < 0)
1158 goto __nodev;
1159 err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0);
1160 if (err < 0)
1161 goto __nodev;
e74670b6
JK		 1162 loopback_proc_new(loopback, 0);
1163 loopback_proc_new(loopback, 1);
597603d6
JK		 1164 strcpy(card->driver, "Loopback");
1165 strcpy(card->shortname, "Loopback");
1166 sprintf(card->longname, "Loopback %i", dev + 1);
1167 err = snd_card_register(card);
1168 if (!err) {
1169 platform_set_drvdata(devptr, card);
1170 return 0;
1171 }
1172 __nodev:
1173 snd_card_free(card);
1174 return err;
1175}
1176
fbbb01a1 1177static int loopback_remove(struct platform_device *devptr)
597603d6
JK		 1178{
1179 snd_card_free(platform_get_drvdata(devptr));
597603d6
JK		 1180 return 0;
1181}
1182
d34e4e00 1183#ifdef CONFIG_PM_SLEEP
284e7ca7 1184static int loopback_suspend(struct device *pdev)
597603d6 1185{
284e7ca7 1186 struct snd_card *card = dev_get_drvdata(pdev);
597603d6
JK		 1187
1188 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
597603d6
JK		 1189 return 0;
1190}
1191
284e7ca7 1192static int loopback_resume(struct device *pdev)
597603d6 1193{
284e7ca7 1194 struct snd_card *card = dev_get_drvdata(pdev);
597603d6
JK		 1195
1196 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1197 return 0;
1198}
284e7ca7
TI		 1199
1200static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume);
1201#define LOOPBACK_PM_OPS &loopback_pm
1202#else
1203#define LOOPBACK_PM_OPS NULL
597603d6
JK		 1204#endif
1205
1206#define SND_LOOPBACK_DRIVER "snd_aloop"
1207
1208static struct platform_driver loopback_driver = {
1209 .probe = loopback_probe,
fbbb01a1 1210 .remove = loopback_remove,
597603d6 1211 .driver = {
8bf01d8a 1212 .name = SND_LOOPBACK_DRIVER,
284e7ca7 1213 .pm = LOOPBACK_PM_OPS,
597603d6
JK		 1214 },
1215};
1216
1217static void loopback_unregister_all(void)
1218{
1219 int i;
1220
1221 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1222 platform_device_unregister(devices[i]);
1223 platform_driver_unregister(&loopback_driver);
1224}
1225
1226static int __init alsa_card_loopback_init(void)
1227{
1228 int i, err, cards;
1229
1230 err = platform_driver_register(&loopback_driver);
1231 if (err < 0)
1232 return err;
1233
1234
1235 cards = 0;
1236 for (i = 0; i < SNDRV_CARDS; i++) {
1237 struct platform_device *device;
1238 if (!enable[i])
1239 continue;
1240 device = platform_device_register_simple(SND_LOOPBACK_DRIVER,
1241 i, NULL, 0);
1242 if (IS_ERR(device))
1243 continue;
1244 if (!platform_get_drvdata(device)) {
1245 platform_device_unregister(device);
1246 continue;
1247 }
1248 devices[i] = device;
1249 cards++;
1250 }
1251 if (!cards) {
1252#ifdef MODULE
1253 printk(KERN_ERR "aloop: No loopback enabled\n");
1254#endif
1255 loopback_unregister_all();
1256 return -ENODEV;
1257 }
1258 return 0;
1259}
1260
1261static void __exit alsa_card_loopback_exit(void)
1262{
1263 loopback_unregister_all();
1264}
1265
1266module_init(alsa_card_loopback_init)
1267module_exit(alsa_card_loopback_exit)
Linux 6.x block layer and io_uring tree(s)