Commit | Line | Data |
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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 | 30 | #include <sound/initval.h> |
26c53379 | 31 | #include <sound/timer.h> |
597603d6 JK |
32 | |
33 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); | |
34 | MODULE_DESCRIPTION("A loopback soundcard"); | |
35 | MODULE_LICENSE("GPL"); | |
36 | MODULE_SUPPORTED_DEVICE("{{ALSA,Loopback soundcard}}"); | |
37 | ||
38 | #define MAX_PCM_SUBSTREAMS 8 | |
39 | ||
40 | static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ | |
41 | static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ | |
a67ff6a5 | 42 | static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0}; |
597603d6 JK |
43 | static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8}; |
44 | static int pcm_notify[SNDRV_CARDS]; | |
26c53379 | 45 | static char *timer_source[SNDRV_CARDS]; |
597603d6 JK |
46 | |
47 | module_param_array(index, int, NULL, 0444); | |
48 | MODULE_PARM_DESC(index, "Index value for loopback soundcard."); | |
49 | module_param_array(id, charp, NULL, 0444); | |
50 | MODULE_PARM_DESC(id, "ID string for loopback soundcard."); | |
51 | module_param_array(enable, bool, NULL, 0444); | |
52 | MODULE_PARM_DESC(enable, "Enable this loopback soundcard."); | |
53 | module_param_array(pcm_substreams, int, NULL, 0444); | |
54 | MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-8) for loopback driver."); | |
55 | module_param_array(pcm_notify, int, NULL, 0444); | |
56 | MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels changes."); | |
26c53379 TW |
57 | module_param_array(timer_source, charp, NULL, 0444); |
58 | MODULE_PARM_DESC(timer_source, "Sound card name or number and device/subdevice number of timer to be used. Empty string for jiffies timer [default]."); | |
597603d6 JK |
59 | |
60 | #define NO_PITCH 100000 | |
61 | ||
fd1f7c74 TW |
62 | #define CABLE_VALID_PLAYBACK BIT(SNDRV_PCM_STREAM_PLAYBACK) |
63 | #define CABLE_VALID_CAPTURE BIT(SNDRV_PCM_STREAM_CAPTURE) | |
64 | #define CABLE_VALID_BOTH (CABLE_VALID_PLAYBACK | CABLE_VALID_CAPTURE) | |
65 | ||
133f3759 | 66 | struct loopback_cable; |
597603d6 JK |
67 | struct loopback_pcm; |
68 | ||
133f3759 TW |
69 | struct loopback_ops { |
70 | /* optional | |
71 | * call in loopback->cable_lock | |
72 | */ | |
73 | int (*open)(struct loopback_pcm *dpcm); | |
74 | /* required | |
75 | * call in cable->lock | |
76 | */ | |
77 | int (*start)(struct loopback_pcm *dpcm); | |
78 | /* required | |
79 | * call in cable->lock | |
80 | */ | |
81 | int (*stop)(struct loopback_pcm *dpcm); | |
82 | /* optional */ | |
83 | int (*stop_sync)(struct loopback_pcm *dpcm); | |
84 | /* optional */ | |
85 | int (*close_substream)(struct loopback_pcm *dpcm); | |
86 | /* optional | |
87 | * call in loopback->cable_lock | |
88 | */ | |
89 | int (*close_cable)(struct loopback_pcm *dpcm); | |
90 | /* optional | |
91 | * call in cable->lock | |
92 | */ | |
93 | unsigned int (*pos_update)(struct loopback_cable *cable); | |
94 | /* optional */ | |
95 | void (*dpcm_info)(struct loopback_pcm *dpcm, | |
96 | struct snd_info_buffer *buffer); | |
97 | }; | |
98 | ||
597603d6 JK |
99 | struct loopback_cable { |
100 | spinlock_t lock; | |
101 | struct loopback_pcm *streams[2]; | |
102 | struct snd_pcm_hardware hw; | |
103 | /* flags */ | |
104 | unsigned int valid; | |
105 | unsigned int running; | |
5de9e45f | 106 | unsigned int pause; |
133f3759 | 107 | /* timer specific */ |
e714fa93 | 108 | const struct loopback_ops *ops; |
26c53379 TW |
109 | /* If sound timer is used */ |
110 | struct { | |
111 | int stream; | |
112 | struct snd_timer_id id; | |
6053a712 | 113 | struct work_struct event_work; |
26c53379 TW |
114 | struct snd_timer_instance *instance; |
115 | } snd_timer; | |
597603d6 JK |
116 | }; |
117 | ||
118 | struct loopback_setup { | |
119 | unsigned int notify: 1; | |
120 | unsigned int rate_shift; | |
8c356c52 | 121 | snd_pcm_format_t format; |
597603d6 JK |
122 | unsigned int rate; |
123 | unsigned int channels; | |
124 | struct snd_ctl_elem_id active_id; | |
125 | struct snd_ctl_elem_id format_id; | |
126 | struct snd_ctl_elem_id rate_id; | |
127 | struct snd_ctl_elem_id channels_id; | |
128 | }; | |
129 | ||
130 | struct loopback { | |
131 | struct snd_card *card; | |
132 | struct mutex cable_lock; | |
133 | struct loopback_cable *cables[MAX_PCM_SUBSTREAMS][2]; | |
134 | struct snd_pcm *pcm[2]; | |
135 | struct loopback_setup setup[MAX_PCM_SUBSTREAMS][2]; | |
26c53379 | 136 | const char *timer_source; |
597603d6 JK |
137 | }; |
138 | ||
139 | struct loopback_pcm { | |
140 | struct loopback *loopback; | |
141 | struct snd_pcm_substream *substream; | |
142 | struct loopback_cable *cable; | |
143 | unsigned int pcm_buffer_size; | |
144 | unsigned int buf_pos; /* position in buffer */ | |
145 | unsigned int silent_size; | |
146 | /* PCM parameters */ | |
147 | unsigned int pcm_period_size; | |
148 | unsigned int pcm_bps; /* bytes per second */ | |
149 | unsigned int pcm_salign; /* bytes per sample * channels */ | |
150 | unsigned int pcm_rate_shift; /* rate shift value */ | |
151 | /* flags */ | |
152 | unsigned int period_update_pending :1; | |
153 | /* timer stuff */ | |
97dda3da TW |
154 | unsigned int irq_pos; /* fractional IRQ position in jiffies |
155 | * ticks | |
156 | */ | |
157 | unsigned int period_size_frac; /* period size in jiffies ticks */ | |
b012513c | 158 | unsigned int last_drift; |
597603d6 | 159 | unsigned long last_jiffies; |
26c53379 | 160 | /* If jiffies timer is used */ |
597603d6 JK |
161 | struct timer_list timer; |
162 | }; | |
163 | ||
164 | static struct platform_device *devices[SNDRV_CARDS]; | |
165 | ||
166 | static inline unsigned int byte_pos(struct loopback_pcm *dpcm, unsigned int x) | |
167 | { | |
168 | if (dpcm->pcm_rate_shift == NO_PITCH) { | |
169 | x /= HZ; | |
170 | } else { | |
171 | x = div_u64(NO_PITCH * (unsigned long long)x, | |
172 | HZ * (unsigned long long)dpcm->pcm_rate_shift); | |
173 | } | |
174 | return x - (x % dpcm->pcm_salign); | |
175 | } | |
176 | ||
177 | static inline unsigned int frac_pos(struct loopback_pcm *dpcm, unsigned int x) | |
178 | { | |
179 | if (dpcm->pcm_rate_shift == NO_PITCH) { /* no pitch */ | |
180 | return x * HZ; | |
181 | } else { | |
182 | x = div_u64(dpcm->pcm_rate_shift * (unsigned long long)x * HZ, | |
183 | NO_PITCH); | |
184 | } | |
185 | return x; | |
186 | } | |
187 | ||
188 | static inline struct loopback_setup *get_setup(struct loopback_pcm *dpcm) | |
189 | { | |
190 | int device = dpcm->substream->pstr->pcm->device; | |
191 | ||
192 | if (dpcm->substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
193 | device ^= 1; | |
194 | return &dpcm->loopback->setup[dpcm->substream->number][device]; | |
195 | } | |
196 | ||
197 | static inline unsigned int get_notify(struct loopback_pcm *dpcm) | |
198 | { | |
199 | return get_setup(dpcm)->notify; | |
200 | } | |
201 | ||
202 | static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm) | |
203 | { | |
204 | return get_setup(dpcm)->rate_shift; | |
205 | } | |
206 | ||
999fc9f6 | 207 | /* call in cable->lock */ |
8e3bf7cd | 208 | static int loopback_jiffies_timer_start(struct loopback_pcm *dpcm) |
597603d6 JK |
209 | { |
210 | unsigned long tick; | |
211 | unsigned int rate_shift = get_rate_shift(dpcm); | |
212 | ||
213 | if (rate_shift != dpcm->pcm_rate_shift) { | |
214 | dpcm->pcm_rate_shift = rate_shift; | |
215 | dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size); | |
216 | } | |
0db71023 JK |
217 | if (dpcm->period_size_frac <= dpcm->irq_pos) { |
218 | dpcm->irq_pos %= dpcm->period_size_frac; | |
219 | dpcm->period_update_pending = 1; | |
220 | } | |
597603d6 | 221 | tick = dpcm->period_size_frac - dpcm->irq_pos; |
7ef74bdc | 222 | tick = DIV_ROUND_UP(tick, dpcm->pcm_bps); |
db974553 | 223 | mod_timer(&dpcm->timer, jiffies + tick); |
09419f1a TW |
224 | |
225 | return 0; | |
597603d6 JK |
226 | } |
227 | ||
26c53379 TW |
228 | /* call in cable->lock */ |
229 | static int loopback_snd_timer_start(struct loopback_pcm *dpcm) | |
230 | { | |
231 | struct loopback_cable *cable = dpcm->cable; | |
232 | int err; | |
233 | ||
234 | /* Loopback device has to use same period as timer card. Therefore | |
235 | * wake up for each snd_pcm_period_elapsed() call of timer card. | |
236 | */ | |
237 | err = snd_timer_start(cable->snd_timer.instance, 1); | |
238 | if (err < 0) { | |
239 | /* do not report error if trying to start but already | |
240 | * running. For example called by opposite substream | |
241 | * of the same cable | |
242 | */ | |
243 | if (err == -EBUSY) | |
244 | return 0; | |
245 | ||
246 | pcm_err(dpcm->substream->pcm, | |
247 | "snd_timer_start(%d,%d,%d) failed with %d", | |
248 | cable->snd_timer.id.card, | |
249 | cable->snd_timer.id.device, | |
250 | cable->snd_timer.id.subdevice, | |
251 | err); | |
252 | } | |
253 | ||
254 | return err; | |
255 | } | |
256 | ||
999fc9f6 | 257 | /* call in cable->lock */ |
8e3bf7cd | 258 | static inline int loopback_jiffies_timer_stop(struct loopback_pcm *dpcm) |
597603d6 JK |
259 | { |
260 | del_timer(&dpcm->timer); | |
e74670b6 | 261 | dpcm->timer.expires = 0; |
09419f1a TW |
262 | |
263 | return 0; | |
597603d6 JK |
264 | } |
265 | ||
26c53379 TW |
266 | /* call in cable->lock */ |
267 | static int loopback_snd_timer_stop(struct loopback_pcm *dpcm) | |
268 | { | |
269 | struct loopback_cable *cable = dpcm->cable; | |
270 | int err; | |
271 | ||
272 | /* only stop if both devices (playback and capture) are not running */ | |
273 | if (cable->running ^ cable->pause) | |
274 | return 0; | |
275 | ||
276 | err = snd_timer_stop(cable->snd_timer.instance); | |
277 | if (err < 0) { | |
278 | pcm_err(dpcm->substream->pcm, | |
279 | "snd_timer_stop(%d,%d,%d) failed with %d", | |
280 | cable->snd_timer.id.card, | |
281 | cable->snd_timer.id.device, | |
282 | cable->snd_timer.id.subdevice, | |
283 | err); | |
284 | } | |
285 | ||
286 | return err; | |
287 | } | |
288 | ||
8e3bf7cd | 289 | static inline int loopback_jiffies_timer_stop_sync(struct loopback_pcm *dpcm) |
67a01afa TI |
290 | { |
291 | del_timer_sync(&dpcm->timer); | |
09419f1a TW |
292 | |
293 | return 0; | |
67a01afa TI |
294 | } |
295 | ||
26c53379 TW |
296 | /* call in loopback->cable_lock */ |
297 | static int loopback_snd_timer_close_cable(struct loopback_pcm *dpcm) | |
298 | { | |
299 | struct loopback_cable *cable = dpcm->cable; | |
300 | ||
301 | /* snd_timer was not opened */ | |
302 | if (!cable->snd_timer.instance) | |
303 | return 0; | |
304 | ||
26c53379 TW |
305 | /* will only be called from free_cable() when other stream was |
306 | * already closed. Other stream cannot be reopened as long as | |
307 | * loopback->cable_lock is locked. Therefore no need to lock | |
308 | * cable->lock; | |
309 | */ | |
310 | snd_timer_close(cable->snd_timer.instance); | |
9314e44f | 311 | |
6053a712 TI |
312 | /* wait till drain work has finished if requested */ |
313 | cancel_work_sync(&cable->snd_timer.event_work); | |
9314e44f | 314 | |
26c53379 TW |
315 | snd_timer_instance_free(cable->snd_timer.instance); |
316 | memset(&cable->snd_timer, 0, sizeof(cable->snd_timer)); | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
597603d6 JK |
321 | static int loopback_check_format(struct loopback_cable *cable, int stream) |
322 | { | |
b1c73fc8 | 323 | struct snd_pcm_runtime *runtime, *cruntime; |
597603d6 JK |
324 | struct loopback_setup *setup; |
325 | struct snd_card *card; | |
326 | int check; | |
327 | ||
328 | if (cable->valid != CABLE_VALID_BOTH) { | |
329 | if (stream == SNDRV_PCM_STREAM_PLAYBACK) | |
330 | goto __notify; | |
331 | return 0; | |
332 | } | |
333 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> | |
334 | substream->runtime; | |
b1c73fc8 JK |
335 | cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> |
336 | substream->runtime; | |
337 | check = runtime->format != cruntime->format || | |
338 | runtime->rate != cruntime->rate || | |
339 | runtime->channels != cruntime->channels; | |
597603d6 JK |
340 | if (!check) |
341 | return 0; | |
342 | if (stream == SNDRV_PCM_STREAM_CAPTURE) { | |
343 | return -EIO; | |
344 | } else { | |
345 | snd_pcm_stop(cable->streams[SNDRV_PCM_STREAM_CAPTURE]-> | |
346 | substream, SNDRV_PCM_STATE_DRAINING); | |
347 | __notify: | |
348 | runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]-> | |
349 | substream->runtime; | |
350 | setup = get_setup(cable->streams[SNDRV_PCM_STREAM_PLAYBACK]); | |
351 | card = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->loopback->card; | |
352 | if (setup->format != runtime->format) { | |
353 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
354 | &setup->format_id); | |
355 | setup->format = runtime->format; | |
356 | } | |
357 | if (setup->rate != runtime->rate) { | |
358 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
359 | &setup->rate_id); | |
360 | setup->rate = runtime->rate; | |
361 | } | |
362 | if (setup->channels != runtime->channels) { | |
363 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
364 | &setup->channels_id); | |
365 | setup->channels = runtime->channels; | |
366 | } | |
367 | } | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static void loopback_active_notify(struct loopback_pcm *dpcm) | |
372 | { | |
373 | snd_ctl_notify(dpcm->loopback->card, | |
374 | SNDRV_CTL_EVENT_MASK_VALUE, | |
375 | &get_setup(dpcm)->active_id); | |
376 | } | |
377 | ||
378 | static int loopback_trigger(struct snd_pcm_substream *substream, int cmd) | |
379 | { | |
380 | struct snd_pcm_runtime *runtime = substream->runtime; | |
381 | struct loopback_pcm *dpcm = runtime->private_data; | |
382 | struct loopback_cable *cable = dpcm->cable; | |
09419f1a | 383 | int err = 0, stream = 1 << substream->stream; |
597603d6 JK |
384 | |
385 | switch (cmd) { | |
386 | case SNDRV_PCM_TRIGGER_START: | |
387 | err = loopback_check_format(cable, substream->stream); | |
388 | if (err < 0) | |
389 | return err; | |
390 | dpcm->last_jiffies = jiffies; | |
391 | dpcm->pcm_rate_shift = 0; | |
b012513c | 392 | dpcm->last_drift = 0; |
dd04bb12 | 393 | spin_lock(&cable->lock); |
5de9e45f JK |
394 | cable->running |= stream; |
395 | cable->pause &= ~stream; | |
133f3759 | 396 | err = cable->ops->start(dpcm); |
999fc9f6 | 397 | spin_unlock(&cable->lock); |
597603d6 JK |
398 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
399 | loopback_active_notify(dpcm); | |
400 | break; | |
401 | case SNDRV_PCM_TRIGGER_STOP: | |
dd04bb12 | 402 | spin_lock(&cable->lock); |
5de9e45f JK |
403 | cable->running &= ~stream; |
404 | cable->pause &= ~stream; | |
133f3759 | 405 | err = cable->ops->stop(dpcm); |
999fc9f6 | 406 | spin_unlock(&cable->lock); |
597603d6 JK |
407 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
408 | loopback_active_notify(dpcm); | |
409 | break; | |
5de9e45f | 410 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
edac8943 | 411 | case SNDRV_PCM_TRIGGER_SUSPEND: |
5de9e45f JK |
412 | spin_lock(&cable->lock); |
413 | cable->pause |= stream; | |
133f3759 | 414 | err = cable->ops->stop(dpcm); |
999fc9f6 | 415 | spin_unlock(&cable->lock); |
306a4f3c RR |
416 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
417 | loopback_active_notify(dpcm); | |
5de9e45f JK |
418 | break; |
419 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
edac8943 | 420 | case SNDRV_PCM_TRIGGER_RESUME: |
5de9e45f JK |
421 | spin_lock(&cable->lock); |
422 | dpcm->last_jiffies = jiffies; | |
423 | cable->pause &= ~stream; | |
133f3759 | 424 | err = cable->ops->start(dpcm); |
999fc9f6 | 425 | spin_unlock(&cable->lock); |
306a4f3c RR |
426 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
427 | loopback_active_notify(dpcm); | |
5de9e45f | 428 | break; |
597603d6 JK |
429 | default: |
430 | return -EINVAL; | |
431 | } | |
09419f1a | 432 | return err; |
597603d6 JK |
433 | } |
434 | ||
b1c73fc8 JK |
435 | static void params_change(struct snd_pcm_substream *substream) |
436 | { | |
437 | struct snd_pcm_runtime *runtime = substream->runtime; | |
438 | struct loopback_pcm *dpcm = runtime->private_data; | |
439 | struct loopback_cable *cable = dpcm->cable; | |
440 | ||
74c34ca1 | 441 | cable->hw.formats = pcm_format_to_bits(runtime->format); |
b1c73fc8 JK |
442 | cable->hw.rate_min = runtime->rate; |
443 | cable->hw.rate_max = runtime->rate; | |
444 | cable->hw.channels_min = runtime->channels; | |
445 | cable->hw.channels_max = runtime->channels; | |
26c53379 TW |
446 | |
447 | if (cable->snd_timer.instance) { | |
448 | cable->hw.period_bytes_min = | |
449 | frames_to_bytes(runtime, runtime->period_size); | |
450 | cable->hw.period_bytes_max = cable->hw.period_bytes_min; | |
451 | } | |
452 | ||
b1c73fc8 JK |
453 | } |
454 | ||
597603d6 JK |
455 | static int loopback_prepare(struct snd_pcm_substream *substream) |
456 | { | |
457 | struct snd_pcm_runtime *runtime = substream->runtime; | |
458 | struct loopback_pcm *dpcm = runtime->private_data; | |
459 | struct loopback_cable *cable = dpcm->cable; | |
09419f1a | 460 | int err, bps, salign; |
597603d6 | 461 | |
133f3759 TW |
462 | if (cable->ops->stop_sync) { |
463 | err = cable->ops->stop_sync(dpcm); | |
464 | if (err < 0) | |
465 | return err; | |
466 | } | |
67a01afa | 467 | |
50e09084 | 468 | salign = (snd_pcm_format_physical_width(runtime->format) * |
597603d6 JK |
469 | runtime->channels) / 8; |
470 | bps = salign * runtime->rate; | |
471 | if (bps <= 0 || salign <= 0) | |
472 | return -EINVAL; | |
473 | ||
474 | dpcm->buf_pos = 0; | |
475 | dpcm->pcm_buffer_size = frames_to_bytes(runtime, runtime->buffer_size); | |
476 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { | |
477 | /* clear capture buffer */ | |
478 | dpcm->silent_size = dpcm->pcm_buffer_size; | |
479 | snd_pcm_format_set_silence(runtime->format, runtime->dma_area, | |
480 | runtime->buffer_size * runtime->channels); | |
481 | } | |
482 | ||
483 | dpcm->irq_pos = 0; | |
484 | dpcm->period_update_pending = 0; | |
485 | dpcm->pcm_bps = bps; | |
486 | dpcm->pcm_salign = salign; | |
487 | dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size); | |
488 | ||
489 | mutex_lock(&dpcm->loopback->cable_lock); | |
b1c73fc8 JK |
490 | if (!(cable->valid & ~(1 << substream->stream)) || |
491 | (get_setup(dpcm)->notify && | |
492 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) | |
493 | params_change(substream); | |
597603d6 JK |
494 | cable->valid |= 1 << substream->stream; |
495 | mutex_unlock(&dpcm->loopback->cable_lock); | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static void clear_capture_buf(struct loopback_pcm *dpcm, unsigned int bytes) | |
501 | { | |
502 | struct snd_pcm_runtime *runtime = dpcm->substream->runtime; | |
503 | char *dst = runtime->dma_area; | |
504 | unsigned int dst_off = dpcm->buf_pos; | |
505 | ||
506 | if (dpcm->silent_size >= dpcm->pcm_buffer_size) | |
507 | return; | |
508 | if (dpcm->silent_size + bytes > dpcm->pcm_buffer_size) | |
509 | bytes = dpcm->pcm_buffer_size - dpcm->silent_size; | |
510 | ||
511 | for (;;) { | |
512 | unsigned int size = bytes; | |
513 | if (dst_off + size > dpcm->pcm_buffer_size) | |
514 | size = dpcm->pcm_buffer_size - dst_off; | |
515 | snd_pcm_format_set_silence(runtime->format, dst + dst_off, | |
516 | bytes_to_frames(runtime, size) * | |
517 | runtime->channels); | |
518 | dpcm->silent_size += size; | |
519 | bytes -= size; | |
520 | if (!bytes) | |
521 | break; | |
522 | dst_off = 0; | |
523 | } | |
524 | } | |
525 | ||
526 | static void copy_play_buf(struct loopback_pcm *play, | |
527 | struct loopback_pcm *capt, | |
528 | unsigned int bytes) | |
529 | { | |
530 | struct snd_pcm_runtime *runtime = play->substream->runtime; | |
20d9a26d | 531 | char *src = runtime->dma_area; |
597603d6 JK |
532 | char *dst = capt->substream->runtime->dma_area; |
533 | unsigned int src_off = play->buf_pos; | |
534 | unsigned int dst_off = capt->buf_pos; | |
535 | unsigned int clear_bytes = 0; | |
536 | ||
537 | /* check if playback is draining, trim the capture copy size | |
538 | * when our pointer is at the end of playback ring buffer */ | |
539 | if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && | |
540 | snd_pcm_playback_hw_avail(runtime) < runtime->buffer_size) { | |
541 | snd_pcm_uframes_t appl_ptr, appl_ptr1, diff; | |
542 | appl_ptr = appl_ptr1 = runtime->control->appl_ptr; | |
543 | appl_ptr1 -= appl_ptr1 % runtime->buffer_size; | |
544 | appl_ptr1 += play->buf_pos / play->pcm_salign; | |
545 | if (appl_ptr < appl_ptr1) | |
546 | appl_ptr1 -= runtime->buffer_size; | |
547 | diff = (appl_ptr - appl_ptr1) * play->pcm_salign; | |
548 | if (diff < bytes) { | |
549 | clear_bytes = bytes - diff; | |
550 | bytes = diff; | |
551 | } | |
552 | } | |
553 | ||
554 | for (;;) { | |
555 | unsigned int size = bytes; | |
556 | if (src_off + size > play->pcm_buffer_size) | |
557 | size = play->pcm_buffer_size - src_off; | |
558 | if (dst_off + size > capt->pcm_buffer_size) | |
559 | size = capt->pcm_buffer_size - dst_off; | |
560 | memcpy(dst + dst_off, src + src_off, size); | |
561 | capt->silent_size = 0; | |
562 | bytes -= size; | |
563 | if (!bytes) | |
564 | break; | |
565 | src_off = (src_off + size) % play->pcm_buffer_size; | |
566 | dst_off = (dst_off + size) % capt->pcm_buffer_size; | |
567 | } | |
568 | ||
20d9a26d | 569 | if (clear_bytes > 0) { |
597603d6 | 570 | clear_capture_buf(capt, clear_bytes); |
20d9a26d JK |
571 | capt->silent_size = 0; |
572 | } | |
597603d6 JK |
573 | } |
574 | ||
b012513c JK |
575 | static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm, |
576 | unsigned int jiffies_delta) | |
597603d6 | 577 | { |
597603d6 | 578 | unsigned long last_pos; |
b012513c | 579 | unsigned int delta; |
597603d6 JK |
580 | |
581 | last_pos = byte_pos(dpcm, dpcm->irq_pos); | |
b012513c JK |
582 | dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps; |
583 | delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos; | |
584 | if (delta >= dpcm->last_drift) | |
585 | delta -= dpcm->last_drift; | |
586 | dpcm->last_drift = 0; | |
597603d6 JK |
587 | if (dpcm->irq_pos >= dpcm->period_size_frac) { |
588 | dpcm->irq_pos %= dpcm->period_size_frac; | |
589 | dpcm->period_update_pending = 1; | |
590 | } | |
b012513c JK |
591 | return delta; |
592 | } | |
593 | ||
594 | static inline void bytepos_finish(struct loopback_pcm *dpcm, | |
595 | unsigned int delta) | |
596 | { | |
597 | dpcm->buf_pos += delta; | |
598 | dpcm->buf_pos %= dpcm->pcm_buffer_size; | |
597603d6 JK |
599 | } |
600 | ||
999fc9f6 | 601 | /* call in cable->lock */ |
8e3bf7cd TW |
602 | static unsigned int loopback_jiffies_timer_pos_update |
603 | (struct loopback_cable *cable) | |
597603d6 JK |
604 | { |
605 | struct loopback_pcm *dpcm_play = | |
606 | cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; | |
607 | struct loopback_pcm *dpcm_capt = | |
608 | cable->streams[SNDRV_PCM_STREAM_CAPTURE]; | |
609 | unsigned long delta_play = 0, delta_capt = 0; | |
b012513c | 610 | unsigned int running, count1, count2; |
597603d6 | 611 | |
5de9e45f | 612 | running = cable->running ^ cable->pause; |
dd04bb12 | 613 | if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { |
597603d6 JK |
614 | delta_play = jiffies - dpcm_play->last_jiffies; |
615 | dpcm_play->last_jiffies += delta_play; | |
616 | } | |
617 | ||
dd04bb12 | 618 | if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { |
597603d6 JK |
619 | delta_capt = jiffies - dpcm_capt->last_jiffies; |
620 | dpcm_capt->last_jiffies += delta_capt; | |
621 | } | |
622 | ||
98d21df4 TI |
623 | if (delta_play == 0 && delta_capt == 0) |
624 | goto unlock; | |
597603d6 JK |
625 | |
626 | if (delta_play > delta_capt) { | |
b012513c JK |
627 | count1 = bytepos_delta(dpcm_play, delta_play - delta_capt); |
628 | bytepos_finish(dpcm_play, count1); | |
597603d6 JK |
629 | delta_play = delta_capt; |
630 | } else if (delta_play < delta_capt) { | |
b012513c JK |
631 | count1 = bytepos_delta(dpcm_capt, delta_capt - delta_play); |
632 | clear_capture_buf(dpcm_capt, count1); | |
633 | bytepos_finish(dpcm_capt, count1); | |
597603d6 JK |
634 | delta_capt = delta_play; |
635 | } | |
636 | ||
98d21df4 TI |
637 | if (delta_play == 0 && delta_capt == 0) |
638 | goto unlock; | |
639 | ||
597603d6 | 640 | /* note delta_capt == delta_play at this moment */ |
b012513c JK |
641 | count1 = bytepos_delta(dpcm_play, delta_play); |
642 | count2 = bytepos_delta(dpcm_capt, delta_capt); | |
643 | if (count1 < count2) { | |
644 | dpcm_capt->last_drift = count2 - count1; | |
645 | count1 = count2; | |
646 | } else if (count1 > count2) { | |
647 | dpcm_play->last_drift = count1 - count2; | |
648 | } | |
649 | copy_play_buf(dpcm_play, dpcm_capt, count1); | |
650 | bytepos_finish(dpcm_play, count1); | |
651 | bytepos_finish(dpcm_capt, count1); | |
98d21df4 | 652 | unlock: |
dd04bb12 | 653 | return running; |
597603d6 JK |
654 | } |
655 | ||
8e3bf7cd | 656 | static void loopback_jiffies_timer_function(struct timer_list *t) |
597603d6 | 657 | { |
bc47ba90 | 658 | struct loopback_pcm *dpcm = from_timer(dpcm, t, timer); |
999fc9f6 | 659 | unsigned long flags; |
597603d6 | 660 | |
999fc9f6 | 661 | spin_lock_irqsave(&dpcm->cable->lock, flags); |
8e3bf7cd TW |
662 | if (loopback_jiffies_timer_pos_update(dpcm->cable) & |
663 | (1 << dpcm->substream->stream)) { | |
664 | loopback_jiffies_timer_start(dpcm); | |
dd04bb12 JK |
665 | if (dpcm->period_update_pending) { |
666 | dpcm->period_update_pending = 0; | |
999fc9f6 TI |
667 | spin_unlock_irqrestore(&dpcm->cable->lock, flags); |
668 | /* need to unlock before calling below */ | |
597603d6 | 669 | snd_pcm_period_elapsed(dpcm->substream); |
999fc9f6 | 670 | return; |
dd04bb12 | 671 | } |
597603d6 | 672 | } |
999fc9f6 | 673 | spin_unlock_irqrestore(&dpcm->cable->lock, flags); |
597603d6 JK |
674 | } |
675 | ||
26c53379 TW |
676 | /* call in cable->lock */ |
677 | static int loopback_snd_timer_check_resolution(struct snd_pcm_runtime *runtime, | |
678 | unsigned long resolution) | |
679 | { | |
680 | if (resolution != runtime->timer_resolution) { | |
681 | struct loopback_pcm *dpcm = runtime->private_data; | |
682 | struct loopback_cable *cable = dpcm->cable; | |
683 | /* Worst case estimation of possible values for resolution | |
684 | * resolution <= (512 * 1024) frames / 8kHz in nsec | |
685 | * resolution <= 65.536.000.000 nsec | |
686 | * | |
687 | * period_size <= 65.536.000.000 nsec / 1000nsec/usec * 192kHz + | |
688 | * 500.000 | |
689 | * period_size <= 12.582.912.000.000 <64bit | |
690 | * / 1.000.000 usec/sec | |
691 | */ | |
692 | snd_pcm_uframes_t period_size_usec = | |
693 | resolution / 1000 * runtime->rate; | |
694 | /* round to nearest sample rate */ | |
695 | snd_pcm_uframes_t period_size = | |
696 | (period_size_usec + 500 * 1000) / (1000 * 1000); | |
697 | ||
698 | pcm_err(dpcm->substream->pcm, | |
699 | "Period size (%lu frames) of loopback device is not corresponding to timer resolution (%lu nsec = %lu frames) of card timer %d,%d,%d. Use period size of %lu frames for loopback device.", | |
700 | runtime->period_size, resolution, period_size, | |
701 | cable->snd_timer.id.card, | |
702 | cable->snd_timer.id.device, | |
703 | cable->snd_timer.id.subdevice, | |
704 | period_size); | |
705 | return -EINVAL; | |
706 | } | |
707 | return 0; | |
708 | } | |
709 | ||
710 | static void loopback_snd_timer_period_elapsed(struct loopback_cable *cable, | |
711 | int event, | |
712 | unsigned long resolution) | |
713 | { | |
714 | struct loopback_pcm *dpcm_play, *dpcm_capt; | |
715 | struct snd_pcm_substream *substream_play, *substream_capt; | |
716 | struct snd_pcm_runtime *valid_runtime; | |
717 | unsigned int running, elapsed_bytes; | |
718 | unsigned long flags; | |
719 | ||
720 | spin_lock_irqsave(&cable->lock, flags); | |
721 | running = cable->running ^ cable->pause; | |
722 | /* no need to do anything if no stream is running */ | |
723 | if (!running) { | |
724 | spin_unlock_irqrestore(&cable->lock, flags); | |
725 | return; | |
726 | } | |
727 | ||
728 | dpcm_play = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]; | |
729 | dpcm_capt = cable->streams[SNDRV_PCM_STREAM_CAPTURE]; | |
26c53379 TW |
730 | |
731 | if (event == SNDRV_TIMER_EVENT_MSTOP) { | |
732 | if (!dpcm_play || | |
733 | dpcm_play->substream->runtime->status->state != | |
734 | SNDRV_PCM_STATE_DRAINING) { | |
735 | spin_unlock_irqrestore(&cable->lock, flags); | |
736 | return; | |
737 | } | |
738 | } | |
739 | ||
5061bb70 AG |
740 | substream_play = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? |
741 | dpcm_play->substream : NULL; | |
742 | substream_capt = (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) ? | |
743 | dpcm_capt->substream : NULL; | |
26c53379 TW |
744 | valid_runtime = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? |
745 | dpcm_play->substream->runtime : | |
746 | dpcm_capt->substream->runtime; | |
747 | ||
748 | /* resolution is only valid for SNDRV_TIMER_EVENT_TICK events */ | |
749 | if (event == SNDRV_TIMER_EVENT_TICK) { | |
750 | /* The hardware rules guarantee that playback and capture period | |
751 | * are the same. Therefore only one device has to be checked | |
752 | * here. | |
753 | */ | |
754 | if (loopback_snd_timer_check_resolution(valid_runtime, | |
755 | resolution) < 0) { | |
756 | spin_unlock_irqrestore(&cable->lock, flags); | |
757 | if (substream_play) | |
758 | snd_pcm_stop_xrun(substream_play); | |
759 | if (substream_capt) | |
760 | snd_pcm_stop_xrun(substream_capt); | |
761 | return; | |
762 | } | |
763 | } | |
764 | ||
765 | elapsed_bytes = frames_to_bytes(valid_runtime, | |
766 | valid_runtime->period_size); | |
767 | /* The same timer interrupt is used for playback and capture device */ | |
768 | if ((running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) && | |
769 | (running & (1 << SNDRV_PCM_STREAM_CAPTURE))) { | |
770 | copy_play_buf(dpcm_play, dpcm_capt, elapsed_bytes); | |
771 | bytepos_finish(dpcm_play, elapsed_bytes); | |
772 | bytepos_finish(dpcm_capt, elapsed_bytes); | |
773 | } else if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) { | |
774 | bytepos_finish(dpcm_play, elapsed_bytes); | |
775 | } else if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) { | |
776 | clear_capture_buf(dpcm_capt, elapsed_bytes); | |
777 | bytepos_finish(dpcm_capt, elapsed_bytes); | |
778 | } | |
779 | spin_unlock_irqrestore(&cable->lock, flags); | |
780 | ||
781 | if (substream_play) | |
782 | snd_pcm_period_elapsed(substream_play); | |
783 | if (substream_capt) | |
784 | snd_pcm_period_elapsed(substream_capt); | |
785 | } | |
786 | ||
787 | static void loopback_snd_timer_function(struct snd_timer_instance *timeri, | |
788 | unsigned long resolution, | |
789 | unsigned long ticks) | |
790 | { | |
791 | struct loopback_cable *cable = timeri->callback_data; | |
792 | ||
793 | loopback_snd_timer_period_elapsed(cable, SNDRV_TIMER_EVENT_TICK, | |
794 | resolution); | |
795 | } | |
796 | ||
6053a712 | 797 | static void loopback_snd_timer_work(struct work_struct *work) |
26c53379 | 798 | { |
6053a712 | 799 | struct loopback_cable *cable; |
26c53379 | 800 | |
6053a712 | 801 | cable = container_of(work, struct loopback_cable, snd_timer.event_work); |
26c53379 TW |
802 | loopback_snd_timer_period_elapsed(cable, SNDRV_TIMER_EVENT_MSTOP, 0); |
803 | } | |
804 | ||
805 | static void loopback_snd_timer_event(struct snd_timer_instance *timeri, | |
806 | int event, | |
fcae40c9 | 807 | struct timespec64 *tstamp, |
26c53379 TW |
808 | unsigned long resolution) |
809 | { | |
810 | /* Do not lock cable->lock here because timer->lock is already hold. | |
811 | * There are other functions which first lock cable->lock and than | |
812 | * timer->lock e.g. | |
813 | * loopback_trigger() | |
814 | * spin_lock(&cable->lock) | |
815 | * loopback_snd_timer_start() | |
816 | * snd_timer_start() | |
817 | * spin_lock(&timer->lock) | |
818 | * Therefore when using the oposit order of locks here it could result | |
819 | * in a deadlock. | |
820 | */ | |
821 | ||
822 | if (event == SNDRV_TIMER_EVENT_MSTOP) { | |
823 | struct loopback_cable *cable = timeri->callback_data; | |
824 | ||
825 | /* sound card of the timer was stopped. Therefore there will not | |
826 | * be any further timer callbacks. Due to this forward audio | |
827 | * data from here if in draining state. When still in running | |
828 | * state the streaming will be aborted by the usual timeout. It | |
829 | * should not be aborted here because may be the timer sound | |
830 | * card does only a recovery and the timer is back soon. | |
6053a712 | 831 | * This work triggers loopback_snd_timer_work() |
26c53379 | 832 | */ |
6053a712 | 833 | schedule_work(&cable->snd_timer.event_work); |
26c53379 TW |
834 | } |
835 | } | |
836 | ||
133f3759 TW |
837 | static void loopback_jiffies_timer_dpcm_info(struct loopback_pcm *dpcm, |
838 | struct snd_info_buffer *buffer) | |
839 | { | |
840 | snd_iprintf(buffer, " update_pending:\t%u\n", | |
841 | dpcm->period_update_pending); | |
842 | snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos); | |
843 | snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac); | |
844 | snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n", | |
845 | dpcm->last_jiffies, jiffies); | |
846 | snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires); | |
847 | } | |
848 | ||
26c53379 TW |
849 | static void loopback_snd_timer_dpcm_info(struct loopback_pcm *dpcm, |
850 | struct snd_info_buffer *buffer) | |
851 | { | |
852 | struct loopback_cable *cable = dpcm->cable; | |
853 | ||
854 | snd_iprintf(buffer, " sound timer:\thw:%d,%d,%d\n", | |
855 | cable->snd_timer.id.card, | |
856 | cable->snd_timer.id.device, | |
857 | cable->snd_timer.id.subdevice); | |
858 | snd_iprintf(buffer, " timer open:\t\t%s\n", | |
859 | (cable->snd_timer.stream == SNDRV_PCM_STREAM_CAPTURE) ? | |
860 | "capture" : "playback"); | |
861 | } | |
862 | ||
597603d6 JK |
863 | static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream) |
864 | { | |
865 | struct snd_pcm_runtime *runtime = substream->runtime; | |
866 | struct loopback_pcm *dpcm = runtime->private_data; | |
999fc9f6 | 867 | snd_pcm_uframes_t pos; |
597603d6 | 868 | |
999fc9f6 | 869 | spin_lock(&dpcm->cable->lock); |
133f3759 TW |
870 | if (dpcm->cable->ops->pos_update) |
871 | dpcm->cable->ops->pos_update(dpcm->cable); | |
999fc9f6 TI |
872 | pos = dpcm->buf_pos; |
873 | spin_unlock(&dpcm->cable->lock); | |
874 | return bytes_to_frames(runtime, pos); | |
597603d6 JK |
875 | } |
876 | ||
b6c0b715 | 877 | static const struct snd_pcm_hardware loopback_pcm_hardware = |
597603d6 JK |
878 | { |
879 | .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP | | |
edac8943 TI |
880 | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | |
881 | SNDRV_PCM_INFO_RESUME), | |
597603d6 | 882 | .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | |
50e09084 TW |
883 | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE | |
884 | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | | |
597603d6 JK |
885 | SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE | |
886 | SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE), | |
887 | .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_192000, | |
888 | .rate_min = 8000, | |
889 | .rate_max = 192000, | |
890 | .channels_min = 1, | |
891 | .channels_max = 32, | |
892 | .buffer_bytes_max = 2 * 1024 * 1024, | |
893 | .period_bytes_min = 64, | |
0db71023 JK |
894 | /* note check overflow in frac_pos() using pcm_rate_shift before |
895 | changing period_bytes_max value */ | |
896 | .period_bytes_max = 1024 * 1024, | |
597603d6 JK |
897 | .periods_min = 1, |
898 | .periods_max = 1024, | |
899 | .fifo_size = 0, | |
900 | }; | |
901 | ||
902 | static void loopback_runtime_free(struct snd_pcm_runtime *runtime) | |
903 | { | |
904 | struct loopback_pcm *dpcm = runtime->private_data; | |
905 | kfree(dpcm); | |
906 | } | |
907 | ||
597603d6 JK |
908 | static int loopback_hw_free(struct snd_pcm_substream *substream) |
909 | { | |
910 | struct snd_pcm_runtime *runtime = substream->runtime; | |
911 | struct loopback_pcm *dpcm = runtime->private_data; | |
912 | struct loopback_cable *cable = dpcm->cable; | |
913 | ||
914 | mutex_lock(&dpcm->loopback->cable_lock); | |
915 | cable->valid &= ~(1 << substream->stream); | |
916 | mutex_unlock(&dpcm->loopback->cable_lock); | |
39729889 | 917 | return 0; |
597603d6 JK |
918 | } |
919 | ||
920 | static unsigned int get_cable_index(struct snd_pcm_substream *substream) | |
921 | { | |
922 | if (!substream->pcm->device) | |
923 | return substream->stream; | |
924 | else | |
925 | return !substream->stream; | |
926 | } | |
927 | ||
b1c73fc8 JK |
928 | static int rule_format(struct snd_pcm_hw_params *params, |
929 | struct snd_pcm_hw_rule *rule) | |
930 | { | |
898dfe46 TI |
931 | struct loopback_pcm *dpcm = rule->private; |
932 | struct loopback_cable *cable = dpcm->cable; | |
b088b53e | 933 | struct snd_mask m; |
b1c73fc8 | 934 | |
b088b53e | 935 | snd_mask_none(&m); |
898dfe46 TI |
936 | mutex_lock(&dpcm->loopback->cable_lock); |
937 | m.bits[0] = (u_int32_t)cable->hw.formats; | |
938 | m.bits[1] = (u_int32_t)(cable->hw.formats >> 32); | |
939 | mutex_unlock(&dpcm->loopback->cable_lock); | |
b088b53e | 940 | return snd_mask_refine(hw_param_mask(params, rule->var), &m); |
b1c73fc8 JK |
941 | } |
942 | ||
943 | static int rule_rate(struct snd_pcm_hw_params *params, | |
944 | struct snd_pcm_hw_rule *rule) | |
945 | { | |
898dfe46 TI |
946 | struct loopback_pcm *dpcm = rule->private; |
947 | struct loopback_cable *cable = dpcm->cable; | |
b1c73fc8 JK |
948 | struct snd_interval t; |
949 | ||
898dfe46 TI |
950 | mutex_lock(&dpcm->loopback->cable_lock); |
951 | t.min = cable->hw.rate_min; | |
952 | t.max = cable->hw.rate_max; | |
953 | mutex_unlock(&dpcm->loopback->cable_lock); | |
b1c73fc8 JK |
954 | t.openmin = t.openmax = 0; |
955 | t.integer = 0; | |
956 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
957 | } | |
958 | ||
959 | static int rule_channels(struct snd_pcm_hw_params *params, | |
960 | struct snd_pcm_hw_rule *rule) | |
961 | { | |
898dfe46 TI |
962 | struct loopback_pcm *dpcm = rule->private; |
963 | struct loopback_cable *cable = dpcm->cable; | |
b1c73fc8 JK |
964 | struct snd_interval t; |
965 | ||
898dfe46 TI |
966 | mutex_lock(&dpcm->loopback->cable_lock); |
967 | t.min = cable->hw.channels_min; | |
968 | t.max = cable->hw.channels_max; | |
969 | mutex_unlock(&dpcm->loopback->cable_lock); | |
b1c73fc8 JK |
970 | t.openmin = t.openmax = 0; |
971 | t.integer = 0; | |
972 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
973 | } | |
974 | ||
26c53379 TW |
975 | static int rule_period_bytes(struct snd_pcm_hw_params *params, |
976 | struct snd_pcm_hw_rule *rule) | |
977 | { | |
978 | struct loopback_pcm *dpcm = rule->private; | |
979 | struct loopback_cable *cable = dpcm->cable; | |
980 | struct snd_interval t; | |
981 | ||
982 | mutex_lock(&dpcm->loopback->cable_lock); | |
983 | t.min = cable->hw.period_bytes_min; | |
984 | t.max = cable->hw.period_bytes_max; | |
985 | mutex_unlock(&dpcm->loopback->cable_lock); | |
986 | t.openmin = 0; | |
987 | t.openmax = 0; | |
988 | t.integer = 0; | |
989 | return snd_interval_refine(hw_param_interval(params, rule->var), &t); | |
990 | } | |
991 | ||
9685347a TI |
992 | static void free_cable(struct snd_pcm_substream *substream) |
993 | { | |
994 | struct loopback *loopback = substream->private_data; | |
995 | int dev = get_cable_index(substream); | |
996 | struct loopback_cable *cable; | |
997 | ||
998 | cable = loopback->cables[substream->number][dev]; | |
999 | if (!cable) | |
1000 | return; | |
1001 | if (cable->streams[!substream->stream]) { | |
1002 | /* other stream is still alive */ | |
8e6b1a72 | 1003 | spin_lock_irq(&cable->lock); |
9685347a | 1004 | cable->streams[substream->stream] = NULL; |
8e6b1a72 | 1005 | spin_unlock_irq(&cable->lock); |
9685347a | 1006 | } else { |
133f3759 TW |
1007 | struct loopback_pcm *dpcm = substream->runtime->private_data; |
1008 | ||
1009 | if (cable->ops && cable->ops->close_cable && dpcm) | |
1010 | cable->ops->close_cable(dpcm); | |
9685347a TI |
1011 | /* free the cable */ |
1012 | loopback->cables[substream->number][dev] = NULL; | |
1013 | kfree(cable); | |
1014 | } | |
1015 | } | |
1016 | ||
133f3759 TW |
1017 | static int loopback_jiffies_timer_open(struct loopback_pcm *dpcm) |
1018 | { | |
8e3bf7cd | 1019 | timer_setup(&dpcm->timer, loopback_jiffies_timer_function, 0); |
133f3759 TW |
1020 | |
1021 | return 0; | |
1022 | } | |
1023 | ||
e714fa93 | 1024 | static const struct loopback_ops loopback_jiffies_timer_ops = { |
133f3759 | 1025 | .open = loopback_jiffies_timer_open, |
8e3bf7cd TW |
1026 | .start = loopback_jiffies_timer_start, |
1027 | .stop = loopback_jiffies_timer_stop, | |
1028 | .stop_sync = loopback_jiffies_timer_stop_sync, | |
1029 | .close_substream = loopback_jiffies_timer_stop_sync, | |
1030 | .pos_update = loopback_jiffies_timer_pos_update, | |
133f3759 TW |
1031 | .dpcm_info = loopback_jiffies_timer_dpcm_info, |
1032 | }; | |
1033 | ||
26c53379 TW |
1034 | static int loopback_parse_timer_id(const char *str, |
1035 | struct snd_timer_id *tid) | |
1036 | { | |
1037 | /* [<pref>:](<card name>|<card idx>)[{.,}<dev idx>[{.,}<subdev idx>]] */ | |
1038 | const char * const sep_dev = ".,"; | |
1039 | const char * const sep_pref = ":"; | |
1040 | const char *name = str; | |
1041 | char *sep, save = '\0'; | |
1042 | int card_idx = 0, dev = 0, subdev = 0; | |
1043 | int err; | |
1044 | ||
1045 | sep = strpbrk(str, sep_pref); | |
1046 | if (sep) | |
1047 | name = sep + 1; | |
1048 | sep = strpbrk(name, sep_dev); | |
1049 | if (sep) { | |
1050 | save = *sep; | |
1051 | *sep = '\0'; | |
1052 | } | |
1053 | err = kstrtoint(name, 0, &card_idx); | |
1054 | if (err == -EINVAL) { | |
1055 | /* Must be the name, not number */ | |
1056 | for (card_idx = 0; card_idx < snd_ecards_limit; card_idx++) { | |
1057 | struct snd_card *card = snd_card_ref(card_idx); | |
1058 | ||
1059 | if (card) { | |
1060 | if (!strcmp(card->id, name)) | |
1061 | err = 0; | |
1062 | snd_card_unref(card); | |
1063 | } | |
1064 | if (!err) | |
1065 | break; | |
1066 | } | |
1067 | } | |
1068 | if (sep) { | |
1069 | *sep = save; | |
1070 | if (!err) { | |
1071 | char *sep2, save2 = '\0'; | |
1072 | ||
1073 | sep2 = strpbrk(sep + 1, sep_dev); | |
1074 | if (sep2) { | |
1075 | save2 = *sep2; | |
1076 | *sep2 = '\0'; | |
1077 | } | |
1078 | err = kstrtoint(sep + 1, 0, &dev); | |
1079 | if (sep2) { | |
1080 | *sep2 = save2; | |
1081 | if (!err) | |
1082 | err = kstrtoint(sep2 + 1, 0, &subdev); | |
1083 | } | |
1084 | } | |
1085 | } | |
1086 | if (!err && tid) { | |
1087 | tid->card = card_idx; | |
1088 | tid->device = dev; | |
1089 | tid->subdevice = subdev; | |
1090 | } | |
1091 | return err; | |
1092 | } | |
1093 | ||
1094 | /* call in loopback->cable_lock */ | |
1095 | static int loopback_snd_timer_open(struct loopback_pcm *dpcm) | |
1096 | { | |
1097 | int err = 0; | |
1098 | struct snd_timer_id tid = { | |
1099 | .dev_class = SNDRV_TIMER_CLASS_PCM, | |
1100 | .dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION, | |
1101 | }; | |
1102 | struct snd_timer_instance *timeri; | |
1103 | struct loopback_cable *cable = dpcm->cable; | |
1104 | ||
26c53379 TW |
1105 | /* check if timer was already opened. It is only opened once |
1106 | * per playback and capture subdevice (aka cable). | |
1107 | */ | |
1108 | if (cable->snd_timer.instance) | |
c037239c | 1109 | goto exit; |
26c53379 TW |
1110 | |
1111 | err = loopback_parse_timer_id(dpcm->loopback->timer_source, &tid); | |
1112 | if (err < 0) { | |
1113 | pcm_err(dpcm->substream->pcm, | |
1114 | "Parsing timer source \'%s\' failed with %d", | |
1115 | dpcm->loopback->timer_source, err); | |
c037239c | 1116 | goto exit; |
26c53379 TW |
1117 | } |
1118 | ||
1119 | cable->snd_timer.stream = dpcm->substream->stream; | |
1120 | cable->snd_timer.id = tid; | |
1121 | ||
1122 | timeri = snd_timer_instance_new(dpcm->loopback->card->id); | |
1123 | if (!timeri) { | |
1124 | err = -ENOMEM; | |
c037239c | 1125 | goto exit; |
26c53379 | 1126 | } |
6053a712 | 1127 | /* The callback has to be called from another work. If |
26c53379 TW |
1128 | * SNDRV_TIMER_IFLG_FAST is specified it will be called from the |
1129 | * snd_pcm_period_elapsed() call of the selected sound card. | |
1130 | * snd_pcm_period_elapsed() helds snd_pcm_stream_lock_irqsave(). | |
1131 | * Due to our callback loopback_snd_timer_function() also calls | |
1132 | * snd_pcm_period_elapsed() which calls snd_pcm_stream_lock_irqsave(). | |
1133 | * This would end up in a dead lock. | |
1134 | */ | |
1135 | timeri->flags |= SNDRV_TIMER_IFLG_AUTO; | |
1136 | timeri->callback = loopback_snd_timer_function; | |
1137 | timeri->callback_data = (void *)cable; | |
1138 | timeri->ccallback = loopback_snd_timer_event; | |
1139 | ||
6053a712 TI |
1140 | /* initialise a work used for draining */ |
1141 | INIT_WORK(&cable->snd_timer.event_work, loopback_snd_timer_work); | |
26c53379 | 1142 | |
c037239c AG |
1143 | /* The mutex loopback->cable_lock is kept locked. |
1144 | * Therefore snd_timer_open() cannot be called a second time | |
1145 | * by the other device of the same cable. | |
26c53379 TW |
1146 | * Therefore the following issue cannot happen: |
1147 | * [proc1] Call loopback_timer_open() -> | |
1148 | * Unlock cable->lock for snd_timer_close/open() call | |
1149 | * [proc2] Call loopback_timer_open() -> snd_timer_open(), | |
1150 | * snd_timer_start() | |
1151 | * [proc1] Call snd_timer_open() and overwrite running timer | |
1152 | * instance | |
1153 | */ | |
26c53379 | 1154 | err = snd_timer_open(timeri, &cable->snd_timer.id, current->pid); |
26c53379 TW |
1155 | if (err < 0) { |
1156 | pcm_err(dpcm->substream->pcm, | |
1157 | "snd_timer_open (%d,%d,%d) failed with %d", | |
1158 | cable->snd_timer.id.card, | |
1159 | cable->snd_timer.id.device, | |
1160 | cable->snd_timer.id.subdevice, | |
1161 | err); | |
1162 | snd_timer_instance_free(timeri); | |
c037239c | 1163 | goto exit; |
26c53379 TW |
1164 | } |
1165 | ||
1166 | cable->snd_timer.instance = timeri; | |
1167 | ||
c037239c | 1168 | exit: |
26c53379 TW |
1169 | return err; |
1170 | } | |
1171 | ||
1172 | /* stop_sync() is not required for sound timer because it does not need to be | |
1173 | * restarted in loopback_prepare() on Xrun recovery | |
1174 | */ | |
e714fa93 | 1175 | static const struct loopback_ops loopback_snd_timer_ops = { |
26c53379 TW |
1176 | .open = loopback_snd_timer_open, |
1177 | .start = loopback_snd_timer_start, | |
1178 | .stop = loopback_snd_timer_stop, | |
1179 | .close_cable = loopback_snd_timer_close_cable, | |
1180 | .dpcm_info = loopback_snd_timer_dpcm_info, | |
1181 | }; | |
1182 | ||
597603d6 JK |
1183 | static int loopback_open(struct snd_pcm_substream *substream) |
1184 | { | |
1185 | struct snd_pcm_runtime *runtime = substream->runtime; | |
1186 | struct loopback *loopback = substream->private_data; | |
1187 | struct loopback_pcm *dpcm; | |
9685347a | 1188 | struct loopback_cable *cable = NULL; |
597603d6 JK |
1189 | int err = 0; |
1190 | int dev = get_cable_index(substream); | |
1191 | ||
1192 | mutex_lock(&loopback->cable_lock); | |
1193 | dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL); | |
1194 | if (!dpcm) { | |
1195 | err = -ENOMEM; | |
1196 | goto unlock; | |
1197 | } | |
1198 | dpcm->loopback = loopback; | |
1199 | dpcm->substream = substream; | |
597603d6 JK |
1200 | |
1201 | cable = loopback->cables[substream->number][dev]; | |
1202 | if (!cable) { | |
1203 | cable = kzalloc(sizeof(*cable), GFP_KERNEL); | |
1204 | if (!cable) { | |
597603d6 JK |
1205 | err = -ENOMEM; |
1206 | goto unlock; | |
1207 | } | |
1208 | spin_lock_init(&cable->lock); | |
1209 | cable->hw = loopback_pcm_hardware; | |
26c53379 TW |
1210 | if (loopback->timer_source) |
1211 | cable->ops = &loopback_snd_timer_ops; | |
1212 | else | |
1213 | cable->ops = &loopback_jiffies_timer_ops; | |
597603d6 JK |
1214 | loopback->cables[substream->number][dev] = cable; |
1215 | } | |
1216 | dpcm->cable = cable; | |
133f3759 TW |
1217 | runtime->private_data = dpcm; |
1218 | ||
1219 | if (cable->ops->open) { | |
1220 | err = cable->ops->open(dpcm); | |
1221 | if (err < 0) | |
1222 | goto unlock; | |
1223 | } | |
597603d6 JK |
1224 | |
1225 | snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); | |
1226 | ||
b1c73fc8 JK |
1227 | /* use dynamic rules based on actual runtime->hw values */ |
1228 | /* note that the default rules created in the PCM midlevel code */ | |
1229 | /* are cached -> they do not reflect the actual state */ | |
1230 | err = snd_pcm_hw_rule_add(runtime, 0, | |
1231 | SNDRV_PCM_HW_PARAM_FORMAT, | |
898dfe46 | 1232 | rule_format, dpcm, |
b1c73fc8 JK |
1233 | SNDRV_PCM_HW_PARAM_FORMAT, -1); |
1234 | if (err < 0) | |
1235 | goto unlock; | |
1236 | err = snd_pcm_hw_rule_add(runtime, 0, | |
1237 | SNDRV_PCM_HW_PARAM_RATE, | |
898dfe46 | 1238 | rule_rate, dpcm, |
b1c73fc8 JK |
1239 | SNDRV_PCM_HW_PARAM_RATE, -1); |
1240 | if (err < 0) | |
1241 | goto unlock; | |
1242 | err = snd_pcm_hw_rule_add(runtime, 0, | |
1243 | SNDRV_PCM_HW_PARAM_CHANNELS, | |
898dfe46 | 1244 | rule_channels, dpcm, |
b1c73fc8 JK |
1245 | SNDRV_PCM_HW_PARAM_CHANNELS, -1); |
1246 | if (err < 0) | |
1247 | goto unlock; | |
1248 | ||
26c53379 TW |
1249 | /* In case of sound timer the period time of both devices of the same |
1250 | * loop has to be the same. | |
1251 | * This rule only takes effect if a sound timer was chosen | |
1252 | */ | |
1253 | if (cable->snd_timer.instance) { | |
1254 | err = snd_pcm_hw_rule_add(runtime, 0, | |
1255 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, | |
1256 | rule_period_bytes, dpcm, | |
1257 | SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1); | |
1258 | if (err < 0) | |
1259 | goto unlock; | |
1260 | } | |
1261 | ||
133f3759 TW |
1262 | /* loopback_runtime_free() has not to be called if kfree(dpcm) was |
1263 | * already called here. Otherwise it will end up with a double free. | |
1264 | */ | |
597603d6 | 1265 | runtime->private_free = loopback_runtime_free; |
b1c73fc8 | 1266 | if (get_notify(dpcm)) |
597603d6 | 1267 | runtime->hw = loopback_pcm_hardware; |
b1c73fc8 | 1268 | else |
597603d6 | 1269 | runtime->hw = cable->hw; |
8e6b1a72 TI |
1270 | |
1271 | spin_lock_irq(&cable->lock); | |
1272 | cable->streams[substream->stream] = dpcm; | |
1273 | spin_unlock_irq(&cable->lock); | |
1274 | ||
597603d6 | 1275 | unlock: |
9685347a TI |
1276 | if (err < 0) { |
1277 | free_cable(substream); | |
1278 | kfree(dpcm); | |
1279 | } | |
597603d6 JK |
1280 | mutex_unlock(&loopback->cable_lock); |
1281 | return err; | |
1282 | } | |
1283 | ||
1284 | static int loopback_close(struct snd_pcm_substream *substream) | |
1285 | { | |
1286 | struct loopback *loopback = substream->private_data; | |
1287 | struct loopback_pcm *dpcm = substream->runtime->private_data; | |
133f3759 | 1288 | int err = 0; |
597603d6 | 1289 | |
133f3759 TW |
1290 | if (dpcm->cable->ops->close_substream) |
1291 | err = dpcm->cable->ops->close_substream(dpcm); | |
597603d6 | 1292 | mutex_lock(&loopback->cable_lock); |
9685347a | 1293 | free_cable(substream); |
597603d6 | 1294 | mutex_unlock(&loopback->cable_lock); |
133f3759 | 1295 | return err; |
597603d6 JK |
1296 | } |
1297 | ||
9f88058e | 1298 | static const struct snd_pcm_ops loopback_pcm_ops = { |
597603d6 JK |
1299 | .open = loopback_open, |
1300 | .close = loopback_close, | |
597603d6 JK |
1301 | .hw_free = loopback_hw_free, |
1302 | .prepare = loopback_prepare, | |
1303 | .trigger = loopback_trigger, | |
1304 | .pointer = loopback_pointer, | |
1305 | }; | |
1306 | ||
fbbb01a1 BP |
1307 | static int loopback_pcm_new(struct loopback *loopback, |
1308 | int device, int substreams) | |
597603d6 JK |
1309 | { |
1310 | struct snd_pcm *pcm; | |
1311 | int err; | |
1312 | ||
1313 | err = snd_pcm_new(loopback->card, "Loopback PCM", device, | |
1314 | substreams, substreams, &pcm); | |
1315 | if (err < 0) | |
1316 | return err; | |
9f88058e TI |
1317 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &loopback_pcm_ops); |
1318 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &loopback_pcm_ops); | |
39729889 | 1319 | snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0); |
597603d6 JK |
1320 | |
1321 | pcm->private_data = loopback; | |
1322 | pcm->info_flags = 0; | |
1323 | strcpy(pcm->name, "Loopback PCM"); | |
1324 | ||
1325 | loopback->pcm[device] = pcm; | |
597603d6 JK |
1326 | return 0; |
1327 | } | |
1328 | ||
1329 | static int loopback_rate_shift_info(struct snd_kcontrol *kcontrol, | |
1330 | struct snd_ctl_elem_info *uinfo) | |
1331 | { | |
1332 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
1333 | uinfo->count = 1; | |
1334 | uinfo->value.integer.min = 80000; | |
1335 | uinfo->value.integer.max = 120000; | |
1336 | uinfo->value.integer.step = 1; | |
1337 | return 0; | |
1338 | } | |
1339 | ||
1340 | static int loopback_rate_shift_get(struct snd_kcontrol *kcontrol, | |
1341 | struct snd_ctl_elem_value *ucontrol) | |
1342 | { | |
1343 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1344 | ||
76b3421b | 1345 | mutex_lock(&loopback->cable_lock); |
597603d6 JK |
1346 | ucontrol->value.integer.value[0] = |
1347 | loopback->setup[kcontrol->id.subdevice] | |
1348 | [kcontrol->id.device].rate_shift; | |
76b3421b | 1349 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1350 | return 0; |
1351 | } | |
1352 | ||
1353 | static int loopback_rate_shift_put(struct snd_kcontrol *kcontrol, | |
1354 | struct snd_ctl_elem_value *ucontrol) | |
1355 | { | |
1356 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1357 | unsigned int val; | |
1358 | int change = 0; | |
1359 | ||
1360 | val = ucontrol->value.integer.value[0]; | |
1361 | if (val < 80000) | |
1362 | val = 80000; | |
1363 | if (val > 120000) | |
1364 | val = 120000; | |
1365 | mutex_lock(&loopback->cable_lock); | |
1366 | if (val != loopback->setup[kcontrol->id.subdevice] | |
1367 | [kcontrol->id.device].rate_shift) { | |
1368 | loopback->setup[kcontrol->id.subdevice] | |
1369 | [kcontrol->id.device].rate_shift = val; | |
1370 | change = 1; | |
1371 | } | |
1372 | mutex_unlock(&loopback->cable_lock); | |
1373 | return change; | |
1374 | } | |
1375 | ||
1376 | static int loopback_notify_get(struct snd_kcontrol *kcontrol, | |
1377 | struct snd_ctl_elem_value *ucontrol) | |
1378 | { | |
1379 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1380 | ||
76b3421b | 1381 | mutex_lock(&loopback->cable_lock); |
597603d6 JK |
1382 | ucontrol->value.integer.value[0] = |
1383 | loopback->setup[kcontrol->id.subdevice] | |
1384 | [kcontrol->id.device].notify; | |
76b3421b | 1385 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1386 | return 0; |
1387 | } | |
1388 | ||
1389 | static int loopback_notify_put(struct snd_kcontrol *kcontrol, | |
1390 | struct snd_ctl_elem_value *ucontrol) | |
1391 | { | |
1392 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1393 | unsigned int val; | |
1394 | int change = 0; | |
1395 | ||
1396 | val = ucontrol->value.integer.value[0] ? 1 : 0; | |
76b3421b | 1397 | mutex_lock(&loopback->cable_lock); |
597603d6 JK |
1398 | if (val != loopback->setup[kcontrol->id.subdevice] |
1399 | [kcontrol->id.device].notify) { | |
1400 | loopback->setup[kcontrol->id.subdevice] | |
1401 | [kcontrol->id.device].notify = val; | |
1402 | change = 1; | |
1403 | } | |
76b3421b | 1404 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1405 | return change; |
1406 | } | |
1407 | ||
1408 | static int loopback_active_get(struct snd_kcontrol *kcontrol, | |
1409 | struct snd_ctl_elem_value *ucontrol) | |
1410 | { | |
1411 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
76b3421b TI |
1412 | struct loopback_cable *cable; |
1413 | ||
597603d6 JK |
1414 | unsigned int val = 0; |
1415 | ||
76b3421b TI |
1416 | mutex_lock(&loopback->cable_lock); |
1417 | cable = loopback->cables[kcontrol->id.subdevice][kcontrol->id.device ^ 1]; | |
306a4f3c RR |
1418 | if (cable != NULL) { |
1419 | unsigned int running = cable->running ^ cable->pause; | |
1420 | ||
1421 | val = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ? 1 : 0; | |
1422 | } | |
76b3421b | 1423 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1424 | ucontrol->value.integer.value[0] = val; |
1425 | return 0; | |
1426 | } | |
1427 | ||
1428 | static int loopback_format_info(struct snd_kcontrol *kcontrol, | |
1429 | struct snd_ctl_elem_info *uinfo) | |
1430 | { | |
1431 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
1432 | uinfo->count = 1; | |
1433 | uinfo->value.integer.min = 0; | |
8c356c52 | 1434 | uinfo->value.integer.max = (__force int)SNDRV_PCM_FORMAT_LAST; |
597603d6 JK |
1435 | uinfo->value.integer.step = 1; |
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | static int loopback_format_get(struct snd_kcontrol *kcontrol, | |
1440 | struct snd_ctl_elem_value *ucontrol) | |
1441 | { | |
1442 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1443 | ||
1444 | ucontrol->value.integer.value[0] = | |
8c356c52 | 1445 | (__force int)loopback->setup[kcontrol->id.subdevice] |
597603d6 JK |
1446 | [kcontrol->id.device].format; |
1447 | return 0; | |
1448 | } | |
1449 | ||
1450 | static int loopback_rate_info(struct snd_kcontrol *kcontrol, | |
1451 | struct snd_ctl_elem_info *uinfo) | |
1452 | { | |
1453 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
1454 | uinfo->count = 1; | |
1455 | uinfo->value.integer.min = 0; | |
1456 | uinfo->value.integer.max = 192000; | |
1457 | uinfo->value.integer.step = 1; | |
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | static int loopback_rate_get(struct snd_kcontrol *kcontrol, | |
1462 | struct snd_ctl_elem_value *ucontrol) | |
1463 | { | |
1464 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1465 | ||
76b3421b | 1466 | mutex_lock(&loopback->cable_lock); |
597603d6 JK |
1467 | ucontrol->value.integer.value[0] = |
1468 | loopback->setup[kcontrol->id.subdevice] | |
1469 | [kcontrol->id.device].rate; | |
76b3421b | 1470 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1471 | return 0; |
1472 | } | |
1473 | ||
1474 | static int loopback_channels_info(struct snd_kcontrol *kcontrol, | |
1475 | struct snd_ctl_elem_info *uinfo) | |
1476 | { | |
1477 | uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; | |
1478 | uinfo->count = 1; | |
1479 | uinfo->value.integer.min = 1; | |
1480 | uinfo->value.integer.max = 1024; | |
1481 | uinfo->value.integer.step = 1; | |
1482 | return 0; | |
1483 | } | |
1484 | ||
1485 | static int loopback_channels_get(struct snd_kcontrol *kcontrol, | |
1486 | struct snd_ctl_elem_value *ucontrol) | |
1487 | { | |
1488 | struct loopback *loopback = snd_kcontrol_chip(kcontrol); | |
1489 | ||
76b3421b | 1490 | mutex_lock(&loopback->cable_lock); |
597603d6 JK |
1491 | ucontrol->value.integer.value[0] = |
1492 | loopback->setup[kcontrol->id.subdevice] | |
1446c5fb | 1493 | [kcontrol->id.device].channels; |
76b3421b | 1494 | mutex_unlock(&loopback->cable_lock); |
597603d6 JK |
1495 | return 0; |
1496 | } | |
1497 | ||
2eccd408 | 1498 | static const struct snd_kcontrol_new loopback_controls[] = { |
597603d6 JK |
1499 | { |
1500 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1501 | .name = "PCM Rate Shift 100000", | |
1502 | .info = loopback_rate_shift_info, | |
1503 | .get = loopback_rate_shift_get, | |
1504 | .put = loopback_rate_shift_put, | |
1505 | }, | |
1506 | { | |
1507 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1508 | .name = "PCM Notify", | |
1509 | .info = snd_ctl_boolean_mono_info, | |
1510 | .get = loopback_notify_get, | |
1511 | .put = loopback_notify_put, | |
1512 | }, | |
1513 | #define ACTIVE_IDX 2 | |
1514 | { | |
1515 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
1516 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1517 | .name = "PCM Slave Active", | |
1518 | .info = snd_ctl_boolean_mono_info, | |
1519 | .get = loopback_active_get, | |
1520 | }, | |
1521 | #define FORMAT_IDX 3 | |
1522 | { | |
1523 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
1524 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1525 | .name = "PCM Slave Format", | |
1526 | .info = loopback_format_info, | |
1527 | .get = loopback_format_get | |
1528 | }, | |
1529 | #define RATE_IDX 4 | |
1530 | { | |
1531 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
1532 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1533 | .name = "PCM Slave Rate", | |
1534 | .info = loopback_rate_info, | |
1535 | .get = loopback_rate_get | |
1536 | }, | |
1537 | #define CHANNELS_IDX 5 | |
1538 | { | |
1539 | .access = SNDRV_CTL_ELEM_ACCESS_READ, | |
1540 | .iface = SNDRV_CTL_ELEM_IFACE_PCM, | |
1541 | .name = "PCM Slave Channels", | |
1542 | .info = loopback_channels_info, | |
1543 | .get = loopback_channels_get | |
1544 | } | |
1545 | }; | |
1546 | ||
fbbb01a1 | 1547 | static int loopback_mixer_new(struct loopback *loopback, int notify) |
597603d6 JK |
1548 | { |
1549 | struct snd_card *card = loopback->card; | |
1550 | struct snd_pcm *pcm; | |
1551 | struct snd_kcontrol *kctl; | |
1552 | struct loopback_setup *setup; | |
1553 | int err, dev, substr, substr_count, idx; | |
1554 | ||
1555 | strcpy(card->mixername, "Loopback Mixer"); | |
1556 | for (dev = 0; dev < 2; dev++) { | |
1557 | pcm = loopback->pcm[dev]; | |
1558 | substr_count = | |
1559 | pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count; | |
1560 | for (substr = 0; substr < substr_count; substr++) { | |
1561 | setup = &loopback->setup[substr][dev]; | |
1562 | setup->notify = notify; | |
1563 | setup->rate_shift = NO_PITCH; | |
1564 | setup->format = SNDRV_PCM_FORMAT_S16_LE; | |
1565 | setup->rate = 48000; | |
1566 | setup->channels = 2; | |
1567 | for (idx = 0; idx < ARRAY_SIZE(loopback_controls); | |
1568 | idx++) { | |
1569 | kctl = snd_ctl_new1(&loopback_controls[idx], | |
1570 | loopback); | |
1571 | if (!kctl) | |
1572 | return -ENOMEM; | |
1573 | kctl->id.device = dev; | |
1574 | kctl->id.subdevice = substr; | |
1575 | switch (idx) { | |
1576 | case ACTIVE_IDX: | |
1577 | setup->active_id = kctl->id; | |
1578 | break; | |
1579 | case FORMAT_IDX: | |
1580 | setup->format_id = kctl->id; | |
1581 | break; | |
1582 | case RATE_IDX: | |
1583 | setup->rate_id = kctl->id; | |
1584 | break; | |
1585 | case CHANNELS_IDX: | |
1586 | setup->channels_id = kctl->id; | |
1587 | break; | |
1588 | default: | |
1589 | break; | |
1590 | } | |
1591 | err = snd_ctl_add(card, kctl); | |
1592 | if (err < 0) | |
1593 | return err; | |
1594 | } | |
1595 | } | |
1596 | } | |
1597 | return 0; | |
1598 | } | |
1599 | ||
e74670b6 JK |
1600 | static void print_dpcm_info(struct snd_info_buffer *buffer, |
1601 | struct loopback_pcm *dpcm, | |
1602 | const char *id) | |
1603 | { | |
1604 | snd_iprintf(buffer, " %s\n", id); | |
1605 | if (dpcm == NULL) { | |
1606 | snd_iprintf(buffer, " inactive\n"); | |
1607 | return; | |
1608 | } | |
1609 | snd_iprintf(buffer, " buffer_size:\t%u\n", dpcm->pcm_buffer_size); | |
1610 | snd_iprintf(buffer, " buffer_pos:\t\t%u\n", dpcm->buf_pos); | |
1611 | snd_iprintf(buffer, " silent_size:\t%u\n", dpcm->silent_size); | |
1612 | snd_iprintf(buffer, " period_size:\t%u\n", dpcm->pcm_period_size); | |
1613 | snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps); | |
1614 | snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign); | |
1615 | snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift); | |
133f3759 TW |
1616 | if (dpcm->cable->ops->dpcm_info) |
1617 | dpcm->cable->ops->dpcm_info(dpcm, buffer); | |
e74670b6 JK |
1618 | } |
1619 | ||
1620 | static void print_substream_info(struct snd_info_buffer *buffer, | |
1621 | struct loopback *loopback, | |
1622 | int sub, | |
1623 | int num) | |
1624 | { | |
1625 | struct loopback_cable *cable = loopback->cables[sub][num]; | |
1626 | ||
1627 | snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub); | |
1628 | if (cable == NULL) { | |
1629 | snd_iprintf(buffer, " inactive\n"); | |
1630 | return; | |
1631 | } | |
1632 | snd_iprintf(buffer, " valid: %u\n", cable->valid); | |
1633 | snd_iprintf(buffer, " running: %u\n", cable->running); | |
5de9e45f | 1634 | snd_iprintf(buffer, " pause: %u\n", cable->pause); |
e74670b6 JK |
1635 | print_dpcm_info(buffer, cable->streams[0], "Playback"); |
1636 | print_dpcm_info(buffer, cable->streams[1], "Capture"); | |
1637 | } | |
1638 | ||
1639 | static void print_cable_info(struct snd_info_entry *entry, | |
1640 | struct snd_info_buffer *buffer) | |
1641 | { | |
1642 | struct loopback *loopback = entry->private_data; | |
1643 | int sub, num; | |
1644 | ||
1645 | mutex_lock(&loopback->cable_lock); | |
1646 | num = entry->name[strlen(entry->name)-1]; | |
1647 | num = num == '0' ? 0 : 1; | |
1648 | for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++) | |
1649 | print_substream_info(buffer, loopback, sub, num); | |
1650 | mutex_unlock(&loopback->cable_lock); | |
1651 | } | |
1652 | ||
c6ae9960 | 1653 | static int loopback_cable_proc_new(struct loopback *loopback, int cidx) |
e74670b6 JK |
1654 | { |
1655 | char name[32]; | |
e74670b6 JK |
1656 | |
1657 | snprintf(name, sizeof(name), "cable#%d", cidx); | |
815d808c TI |
1658 | return snd_card_ro_proc_new(loopback->card, name, loopback, |
1659 | print_cable_info); | |
e74670b6 JK |
1660 | } |
1661 | ||
26c53379 TW |
1662 | static void loopback_set_timer_source(struct loopback *loopback, |
1663 | const char *value) | |
1664 | { | |
1665 | if (loopback->timer_source) { | |
1666 | devm_kfree(loopback->card->dev, loopback->timer_source); | |
1667 | loopback->timer_source = NULL; | |
1668 | } | |
1669 | if (value && *value) | |
1670 | loopback->timer_source = devm_kstrdup(loopback->card->dev, | |
1671 | value, GFP_KERNEL); | |
1672 | } | |
1673 | ||
c6ae9960 AG |
1674 | static void print_timer_source_info(struct snd_info_entry *entry, |
1675 | struct snd_info_buffer *buffer) | |
1676 | { | |
1677 | struct loopback *loopback = entry->private_data; | |
1678 | ||
1679 | mutex_lock(&loopback->cable_lock); | |
1680 | snd_iprintf(buffer, "%s\n", | |
1681 | loopback->timer_source ? loopback->timer_source : ""); | |
1682 | mutex_unlock(&loopback->cable_lock); | |
1683 | } | |
1684 | ||
1685 | static void change_timer_source_info(struct snd_info_entry *entry, | |
1686 | struct snd_info_buffer *buffer) | |
1687 | { | |
1688 | struct loopback *loopback = entry->private_data; | |
1689 | char line[64]; | |
1690 | ||
1691 | mutex_lock(&loopback->cable_lock); | |
1692 | if (!snd_info_get_line(buffer, line, sizeof(line))) | |
1693 | loopback_set_timer_source(loopback, strim(line)); | |
1694 | mutex_unlock(&loopback->cable_lock); | |
1695 | } | |
1696 | ||
1697 | static int loopback_timer_source_proc_new(struct loopback *loopback) | |
1698 | { | |
1699 | return snd_card_rw_proc_new(loopback->card, "timer_source", loopback, | |
1700 | print_timer_source_info, | |
1701 | change_timer_source_info); | |
1702 | } | |
1703 | ||
fbbb01a1 | 1704 | static int loopback_probe(struct platform_device *devptr) |
597603d6 JK |
1705 | { |
1706 | struct snd_card *card; | |
1707 | struct loopback *loopback; | |
1708 | int dev = devptr->id; | |
1709 | int err; | |
1710 | ||
5872f3f6 TI |
1711 | err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE, |
1712 | sizeof(struct loopback), &card); | |
597603d6 JK |
1713 | if (err < 0) |
1714 | return err; | |
1715 | loopback = card->private_data; | |
1716 | ||
1717 | if (pcm_substreams[dev] < 1) | |
1718 | pcm_substreams[dev] = 1; | |
1719 | if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS) | |
1720 | pcm_substreams[dev] = MAX_PCM_SUBSTREAMS; | |
1721 | ||
1722 | loopback->card = card; | |
26c53379 TW |
1723 | loopback_set_timer_source(loopback, timer_source[dev]); |
1724 | ||
597603d6 JK |
1725 | mutex_init(&loopback->cable_lock); |
1726 | ||
1727 | err = loopback_pcm_new(loopback, 0, pcm_substreams[dev]); | |
1728 | if (err < 0) | |
1729 | goto __nodev; | |
1730 | err = loopback_pcm_new(loopback, 1, pcm_substreams[dev]); | |
1731 | if (err < 0) | |
1732 | goto __nodev; | |
1733 | err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0); | |
1734 | if (err < 0) | |
1735 | goto __nodev; | |
c6ae9960 AG |
1736 | loopback_cable_proc_new(loopback, 0); |
1737 | loopback_cable_proc_new(loopback, 1); | |
1738 | loopback_timer_source_proc_new(loopback); | |
597603d6 JK |
1739 | strcpy(card->driver, "Loopback"); |
1740 | strcpy(card->shortname, "Loopback"); | |
1741 | sprintf(card->longname, "Loopback %i", dev + 1); | |
1742 | err = snd_card_register(card); | |
1743 | if (!err) { | |
1744 | platform_set_drvdata(devptr, card); | |
1745 | return 0; | |
1746 | } | |
1747 | __nodev: | |
1748 | snd_card_free(card); | |
1749 | return err; | |
1750 | } | |
1751 | ||
fbbb01a1 | 1752 | static int loopback_remove(struct platform_device *devptr) |
597603d6 JK |
1753 | { |
1754 | snd_card_free(platform_get_drvdata(devptr)); | |
597603d6 JK |
1755 | return 0; |
1756 | } | |
1757 | ||
d34e4e00 | 1758 | #ifdef CONFIG_PM_SLEEP |
284e7ca7 | 1759 | static int loopback_suspend(struct device *pdev) |
597603d6 | 1760 | { |
284e7ca7 | 1761 | struct snd_card *card = dev_get_drvdata(pdev); |
597603d6 JK |
1762 | |
1763 | snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); | |
597603d6 JK |
1764 | return 0; |
1765 | } | |
1766 | ||
284e7ca7 | 1767 | static int loopback_resume(struct device *pdev) |
597603d6 | 1768 | { |
284e7ca7 | 1769 | struct snd_card *card = dev_get_drvdata(pdev); |
597603d6 JK |
1770 | |
1771 | snd_power_change_state(card, SNDRV_CTL_POWER_D0); | |
1772 | return 0; | |
1773 | } | |
284e7ca7 TI |
1774 | |
1775 | static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume); | |
1776 | #define LOOPBACK_PM_OPS &loopback_pm | |
1777 | #else | |
1778 | #define LOOPBACK_PM_OPS NULL | |
597603d6 JK |
1779 | #endif |
1780 | ||
1781 | #define SND_LOOPBACK_DRIVER "snd_aloop" | |
1782 | ||
1783 | static struct platform_driver loopback_driver = { | |
1784 | .probe = loopback_probe, | |
fbbb01a1 | 1785 | .remove = loopback_remove, |
597603d6 | 1786 | .driver = { |
8bf01d8a | 1787 | .name = SND_LOOPBACK_DRIVER, |
284e7ca7 | 1788 | .pm = LOOPBACK_PM_OPS, |
597603d6 JK |
1789 | }, |
1790 | }; | |
1791 | ||
1792 | static void loopback_unregister_all(void) | |
1793 | { | |
1794 | int i; | |
1795 | ||
1796 | for (i = 0; i < ARRAY_SIZE(devices); ++i) | |
1797 | platform_device_unregister(devices[i]); | |
1798 | platform_driver_unregister(&loopback_driver); | |
1799 | } | |
1800 | ||
1801 | static int __init alsa_card_loopback_init(void) | |
1802 | { | |
1803 | int i, err, cards; | |
1804 | ||
1805 | err = platform_driver_register(&loopback_driver); | |
1806 | if (err < 0) | |
1807 | return err; | |
1808 | ||
1809 | ||
1810 | cards = 0; | |
1811 | for (i = 0; i < SNDRV_CARDS; i++) { | |
1812 | struct platform_device *device; | |
1813 | if (!enable[i]) | |
1814 | continue; | |
1815 | device = platform_device_register_simple(SND_LOOPBACK_DRIVER, | |
1816 | i, NULL, 0); | |
1817 | if (IS_ERR(device)) | |
1818 | continue; | |
1819 | if (!platform_get_drvdata(device)) { | |
1820 | platform_device_unregister(device); | |
1821 | continue; | |
1822 | } | |
1823 | devices[i] = device; | |
1824 | cards++; | |
1825 | } | |
1826 | if (!cards) { | |
1827 | #ifdef MODULE | |
1828 | printk(KERN_ERR "aloop: No loopback enabled\n"); | |
1829 | #endif | |
1830 | loopback_unregister_all(); | |
1831 | return -ENODEV; | |
1832 | } | |
1833 | return 0; | |
1834 | } | |
1835 | ||
1836 | static void __exit alsa_card_loopback_exit(void) | |
1837 | { | |
1838 | loopback_unregister_all(); | |
1839 | } | |
1840 | ||
1841 | module_init(alsa_card_loopback_init) | |
1842 | module_exit(alsa_card_loopback_exit) |