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8#include <linux/slab.h>
9#include <linux/sched/signal.h>
10#include <linux/time.h>
11#include <linux/math64.h>
12#include <linux/export.h>
13#include <sound/core.h>
14#include <sound/control.h>
15#include <sound/tlv.h>
16#include <sound/info.h>
17#include <sound/pcm.h>
18#include <sound/pcm_params.h>
19#include <sound/timer.h>
20
21#include "pcm_local.h"
22
23#ifdef CONFIG_SND_PCM_XRUN_DEBUG
24#define CREATE_TRACE_POINTS
25#include "pcm_trace.h"
26#else
27#define trace_hwptr(substream, pos, in_interrupt)
28#define trace_xrun(substream)
29#define trace_hw_ptr_error(substream, reason)
30#define trace_applptr(substream, prev, curr)
31#endif
32
33static int fill_silence_frames(struct snd_pcm_substream *substream,
34 snd_pcm_uframes_t off, snd_pcm_uframes_t frames);
35
36
37
38
39
40
41
42
43
44
45void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
46{
47 struct snd_pcm_runtime *runtime = substream->runtime;
48 snd_pcm_uframes_t frames, ofs, transfer;
49 int err;
50
51 if (runtime->silence_size < runtime->boundary) {
52 snd_pcm_sframes_t noise_dist, n;
53 snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr);
54 if (runtime->silence_start != appl_ptr) {
55 n = appl_ptr - runtime->silence_start;
56 if (n < 0)
57 n += runtime->boundary;
58 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
59 runtime->silence_filled -= n;
60 else
61 runtime->silence_filled = 0;
62 runtime->silence_start = appl_ptr;
63 }
64 if (runtime->silence_filled >= runtime->buffer_size)
65 return;
66 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
67 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
68 return;
69 frames = runtime->silence_threshold - noise_dist;
70 if (frames > runtime->silence_size)
71 frames = runtime->silence_size;
72 } else {
73 if (new_hw_ptr == ULONG_MAX) {
74 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
75 if (avail > runtime->buffer_size)
76 avail = runtime->buffer_size;
77 runtime->silence_filled = avail > 0 ? avail : 0;
78 runtime->silence_start = (runtime->status->hw_ptr +
79 runtime->silence_filled) %
80 runtime->boundary;
81 } else {
82 ofs = runtime->status->hw_ptr;
83 frames = new_hw_ptr - ofs;
84 if ((snd_pcm_sframes_t)frames < 0)
85 frames += runtime->boundary;
86 runtime->silence_filled -= frames;
87 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
88 runtime->silence_filled = 0;
89 runtime->silence_start = new_hw_ptr;
90 } else {
91 runtime->silence_start = ofs;
92 }
93 }
94 frames = runtime->buffer_size - runtime->silence_filled;
95 }
96 if (snd_BUG_ON(frames > runtime->buffer_size))
97 return;
98 if (frames == 0)
99 return;
100 ofs = runtime->silence_start % runtime->buffer_size;
101 while (frames > 0) {
102 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
103 err = fill_silence_frames(substream, ofs, transfer);
104 snd_BUG_ON(err < 0);
105 runtime->silence_filled += transfer;
106 frames -= transfer;
107 ofs = 0;
108 }
109}
110
111#ifdef CONFIG_SND_DEBUG
112void snd_pcm_debug_name(struct snd_pcm_substream *substream,
113 char *name, size_t len)
114{
115 snprintf(name, len, "pcmC%dD%d%c:%d",
116 substream->pcm->card->number,
117 substream->pcm->device,
118 substream->stream ? 'c' : 'p',
119 substream->number);
120}
121EXPORT_SYMBOL(snd_pcm_debug_name);
122#endif
123
124#define XRUN_DEBUG_BASIC (1<<0)
125#define XRUN_DEBUG_STACK (1<<1)
126#define XRUN_DEBUG_JIFFIESCHECK (1<<2)
127
128#ifdef CONFIG_SND_PCM_XRUN_DEBUG
129
130#define xrun_debug(substream, mask) \
131 ((substream)->pstr->xrun_debug & (mask))
132#else
133#define xrun_debug(substream, mask) 0
134#endif
135
136#define dump_stack_on_xrun(substream) do { \
137 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
138 dump_stack(); \
139 } while (0)
140
141
142void __snd_pcm_xrun(struct snd_pcm_substream *substream)
143{
144 struct snd_pcm_runtime *runtime = substream->runtime;
145
146 trace_xrun(substream);
147 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
148 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
149 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
150 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
151 char name[16];
152 snd_pcm_debug_name(substream, name, sizeof(name));
153 pcm_warn(substream->pcm, "XRUN: %s\n", name);
154 dump_stack_on_xrun(substream);
155 }
156}
157
158#ifdef CONFIG_SND_PCM_XRUN_DEBUG
159#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
160 do { \
161 trace_hw_ptr_error(substream, reason); \
162 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
163 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
164 (in_interrupt) ? 'Q' : 'P', ##args); \
165 dump_stack_on_xrun(substream); \
166 } \
167 } while (0)
168
169#else
170
171#define hw_ptr_error(substream, fmt, args...) do { } while (0)
172
173#endif
174
175int snd_pcm_update_state(struct snd_pcm_substream *substream,
176 struct snd_pcm_runtime *runtime)
177{
178 snd_pcm_uframes_t avail;
179
180 avail = snd_pcm_avail(substream);
181 if (avail > runtime->avail_max)
182 runtime->avail_max = avail;
183 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
184 if (avail >= runtime->buffer_size) {
185 snd_pcm_drain_done(substream);
186 return -EPIPE;
187 }
188 } else {
189 if (avail >= runtime->stop_threshold) {
190 __snd_pcm_xrun(substream);
191 return -EPIPE;
192 }
193 }
194 if (runtime->twake) {
195 if (avail >= runtime->twake)
196 wake_up(&runtime->tsleep);
197 } else if (avail >= runtime->control->avail_min)
198 wake_up(&runtime->sleep);
199 return 0;
200}
201
202static void update_audio_tstamp(struct snd_pcm_substream *substream,
203 struct timespec *curr_tstamp,
204 struct timespec *audio_tstamp)
205{
206 struct snd_pcm_runtime *runtime = substream->runtime;
207 u64 audio_frames, audio_nsecs;
208 struct timespec driver_tstamp;
209
210 if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
211 return;
212
213 if (!(substream->ops->get_time_info) ||
214 (runtime->audio_tstamp_report.actual_type ==
215 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
216
217
218
219
220
221
222 audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
223
224 if (runtime->audio_tstamp_config.report_delay) {
225 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
226 audio_frames -= runtime->delay;
227 else
228 audio_frames += runtime->delay;
229 }
230 audio_nsecs = div_u64(audio_frames * 1000000000LL,
231 runtime->rate);
232 *audio_tstamp = ns_to_timespec(audio_nsecs);
233 }
234 if (!timespec_equal(&runtime->status->audio_tstamp, audio_tstamp)) {
235 runtime->status->audio_tstamp = *audio_tstamp;
236 runtime->status->tstamp = *curr_tstamp;
237 }
238
239
240
241
242
243 snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);
244 runtime->driver_tstamp = driver_tstamp;
245}
246
247static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
248 unsigned int in_interrupt)
249{
250 struct snd_pcm_runtime *runtime = substream->runtime;
251 snd_pcm_uframes_t pos;
252 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
253 snd_pcm_sframes_t hdelta, delta;
254 unsigned long jdelta;
255 unsigned long curr_jiffies;
256 struct timespec curr_tstamp;
257 struct timespec audio_tstamp;
258 int crossed_boundary = 0;
259
260 old_hw_ptr = runtime->status->hw_ptr;
261
262
263
264
265
266
267
268 pos = substream->ops->pointer(substream);
269 curr_jiffies = jiffies;
270 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
271 if ((substream->ops->get_time_info) &&
272 (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
273 substream->ops->get_time_info(substream, &curr_tstamp,
274 &audio_tstamp,
275 &runtime->audio_tstamp_config,
276 &runtime->audio_tstamp_report);
277
278
279 if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
280 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
281 } else
282 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
283 }
284
285 if (pos == SNDRV_PCM_POS_XRUN) {
286 __snd_pcm_xrun(substream);
287 return -EPIPE;
288 }
289 if (pos >= runtime->buffer_size) {
290 if (printk_ratelimit()) {
291 char name[16];
292 snd_pcm_debug_name(substream, name, sizeof(name));
293 pcm_err(substream->pcm,
294 "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
295 name, pos, runtime->buffer_size,
296 runtime->period_size);
297 }
298 pos = 0;
299 }
300 pos -= pos % runtime->min_align;
301 trace_hwptr(substream, pos, in_interrupt);
302 hw_base = runtime->hw_ptr_base;
303 new_hw_ptr = hw_base + pos;
304 if (in_interrupt) {
305
306
307 delta = runtime->hw_ptr_interrupt + runtime->period_size;
308 if (delta > new_hw_ptr) {
309
310 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
311 if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
312 hw_base += runtime->buffer_size;
313 if (hw_base >= runtime->boundary) {
314 hw_base = 0;
315 crossed_boundary++;
316 }
317 new_hw_ptr = hw_base + pos;
318 goto __delta;
319 }
320 }
321 }
322
323
324 if (new_hw_ptr < old_hw_ptr) {
325 hw_base += runtime->buffer_size;
326 if (hw_base >= runtime->boundary) {
327 hw_base = 0;
328 crossed_boundary++;
329 }
330 new_hw_ptr = hw_base + pos;
331 }
332 __delta:
333 delta = new_hw_ptr - old_hw_ptr;
334 if (delta < 0)
335 delta += runtime->boundary;
336
337 if (runtime->no_period_wakeup) {
338 snd_pcm_sframes_t xrun_threshold;
339
340
341
342
343 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
344 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
345 goto no_delta_check;
346 hdelta = jdelta - delta * HZ / runtime->rate;
347 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
348 while (hdelta > xrun_threshold) {
349 delta += runtime->buffer_size;
350 hw_base += runtime->buffer_size;
351 if (hw_base >= runtime->boundary) {
352 hw_base = 0;
353 crossed_boundary++;
354 }
355 new_hw_ptr = hw_base + pos;
356 hdelta -= runtime->hw_ptr_buffer_jiffies;
357 }
358 goto no_delta_check;
359 }
360
361
362 if (delta >= runtime->buffer_size + runtime->period_size) {
363 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
364 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
365 substream->stream, (long)pos,
366 (long)new_hw_ptr, (long)old_hw_ptr);
367 return 0;
368 }
369
370
371 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
372 goto no_jiffies_check;
373
374
375
376
377
378 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
379 goto no_jiffies_check;
380 hdelta = delta;
381 if (hdelta < runtime->delay)
382 goto no_jiffies_check;
383 hdelta -= runtime->delay;
384 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
385 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
386 delta = jdelta /
387 (((runtime->period_size * HZ) / runtime->rate)
388 + HZ/100);
389
390 new_hw_ptr = old_hw_ptr;
391 hw_base = delta;
392
393
394 while (delta > 0) {
395 new_hw_ptr += runtime->period_size;
396 if (new_hw_ptr >= runtime->boundary) {
397 new_hw_ptr -= runtime->boundary;
398 crossed_boundary--;
399 }
400 delta--;
401 }
402
403 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
404 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
405 (long)pos, (long)hdelta,
406 (long)runtime->period_size, jdelta,
407 ((hdelta * HZ) / runtime->rate), hw_base,
408 (unsigned long)old_hw_ptr,
409 (unsigned long)new_hw_ptr);
410
411 delta = 0;
412 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
413 }
414 no_jiffies_check:
415 if (delta > runtime->period_size + runtime->period_size / 2) {
416 hw_ptr_error(substream, in_interrupt,
417 "Lost interrupts?",
418 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
419 substream->stream, (long)delta,
420 (long)new_hw_ptr,
421 (long)old_hw_ptr);
422 }
423
424 no_delta_check:
425 if (runtime->status->hw_ptr == new_hw_ptr) {
426 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
427 return 0;
428 }
429
430 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
431 runtime->silence_size > 0)
432 snd_pcm_playback_silence(substream, new_hw_ptr);
433
434 if (in_interrupt) {
435 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
436 if (delta < 0)
437 delta += runtime->boundary;
438 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
439 runtime->hw_ptr_interrupt += delta;
440 if (runtime->hw_ptr_interrupt >= runtime->boundary)
441 runtime->hw_ptr_interrupt -= runtime->boundary;
442 }
443 runtime->hw_ptr_base = hw_base;
444 runtime->status->hw_ptr = new_hw_ptr;
445 runtime->hw_ptr_jiffies = curr_jiffies;
446 if (crossed_boundary) {
447 snd_BUG_ON(crossed_boundary != 1);
448 runtime->hw_ptr_wrap += runtime->boundary;
449 }
450
451 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
452
453 return snd_pcm_update_state(substream, runtime);
454}
455
456
457int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
458{
459 return snd_pcm_update_hw_ptr0(substream, 0);
460}
461
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468
469
470void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
471 const struct snd_pcm_ops *ops)
472{
473 struct snd_pcm_str *stream = &pcm->streams[direction];
474 struct snd_pcm_substream *substream;
475
476 for (substream = stream->substream; substream != NULL; substream = substream->next)
477 substream->ops = ops;
478}
479EXPORT_SYMBOL(snd_pcm_set_ops);
480
481
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483
484
485
486
487void snd_pcm_set_sync(struct snd_pcm_substream *substream)
488{
489 struct snd_pcm_runtime *runtime = substream->runtime;
490
491 runtime->sync.id32[0] = substream->pcm->card->number;
492 runtime->sync.id32[1] = -1;
493 runtime->sync.id32[2] = -1;
494 runtime->sync.id32[3] = -1;
495}
496EXPORT_SYMBOL(snd_pcm_set_sync);
497
498
499
500
501
502static inline unsigned int div32(unsigned int a, unsigned int b,
503 unsigned int *r)
504{
505 if (b == 0) {
506 *r = 0;
507 return UINT_MAX;
508 }
509 *r = a % b;
510 return a / b;
511}
512
513static inline unsigned int div_down(unsigned int a, unsigned int b)
514{
515 if (b == 0)
516 return UINT_MAX;
517 return a / b;
518}
519
520static inline unsigned int div_up(unsigned int a, unsigned int b)
521{
522 unsigned int r;
523 unsigned int q;
524 if (b == 0)
525 return UINT_MAX;
526 q = div32(a, b, &r);
527 if (r)
528 ++q;
529 return q;
530}
531
532static inline unsigned int mul(unsigned int a, unsigned int b)
533{
534 if (a == 0)
535 return 0;
536 if (div_down(UINT_MAX, a) < b)
537 return UINT_MAX;
538 return a * b;
539}
540
541static inline unsigned int muldiv32(unsigned int a, unsigned int b,
542 unsigned int c, unsigned int *r)
543{
544 u_int64_t n = (u_int64_t) a * b;
545 if (c == 0) {
546 *r = 0;
547 return UINT_MAX;
548 }
549 n = div_u64_rem(n, c, r);
550 if (n >= UINT_MAX) {
551 *r = 0;
552 return UINT_MAX;
553 }
554 return n;
555}
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568
569int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
570{
571 int changed = 0;
572 if (snd_BUG_ON(snd_interval_empty(i)))
573 return -EINVAL;
574 if (i->min < v->min) {
575 i->min = v->min;
576 i->openmin = v->openmin;
577 changed = 1;
578 } else if (i->min == v->min && !i->openmin && v->openmin) {
579 i->openmin = 1;
580 changed = 1;
581 }
582 if (i->max > v->max) {
583 i->max = v->max;
584 i->openmax = v->openmax;
585 changed = 1;
586 } else if (i->max == v->max && !i->openmax && v->openmax) {
587 i->openmax = 1;
588 changed = 1;
589 }
590 if (!i->integer && v->integer) {
591 i->integer = 1;
592 changed = 1;
593 }
594 if (i->integer) {
595 if (i->openmin) {
596 i->min++;
597 i->openmin = 0;
598 }
599 if (i->openmax) {
600 i->max--;
601 i->openmax = 0;
602 }
603 } else if (!i->openmin && !i->openmax && i->min == i->max)
604 i->integer = 1;
605 if (snd_interval_checkempty(i)) {
606 snd_interval_none(i);
607 return -EINVAL;
608 }
609 return changed;
610}
611EXPORT_SYMBOL(snd_interval_refine);
612
613static int snd_interval_refine_first(struct snd_interval *i)
614{
615 const unsigned int last_max = i->max;
616
617 if (snd_BUG_ON(snd_interval_empty(i)))
618 return -EINVAL;
619 if (snd_interval_single(i))
620 return 0;
621 i->max = i->min;
622 if (i->openmin)
623 i->max++;
624
625 i->openmax = (i->openmax && i->max >= last_max);
626 return 1;
627}
628
629static int snd_interval_refine_last(struct snd_interval *i)
630{
631 const unsigned int last_min = i->min;
632
633 if (snd_BUG_ON(snd_interval_empty(i)))
634 return -EINVAL;
635 if (snd_interval_single(i))
636 return 0;
637 i->min = i->max;
638 if (i->openmax)
639 i->min--;
640
641 i->openmin = (i->openmin && i->min <= last_min);
642 return 1;
643}
644
645void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
646{
647 if (a->empty || b->empty) {
648 snd_interval_none(c);
649 return;
650 }
651 c->empty = 0;
652 c->min = mul(a->min, b->min);
653 c->openmin = (a->openmin || b->openmin);
654 c->max = mul(a->max, b->max);
655 c->openmax = (a->openmax || b->openmax);
656 c->integer = (a->integer && b->integer);
657}
658
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667
668
669void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
670{
671 unsigned int r;
672 if (a->empty || b->empty) {
673 snd_interval_none(c);
674 return;
675 }
676 c->empty = 0;
677 c->min = div32(a->min, b->max, &r);
678 c->openmin = (r || a->openmin || b->openmax);
679 if (b->min > 0) {
680 c->max = div32(a->max, b->min, &r);
681 if (r) {
682 c->max++;
683 c->openmax = 1;
684 } else
685 c->openmax = (a->openmax || b->openmin);
686 } else {
687 c->max = UINT_MAX;
688 c->openmax = 0;
689 }
690 c->integer = 0;
691}
692
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703
704void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
705 unsigned int k, struct snd_interval *c)
706{
707 unsigned int r;
708 if (a->empty || b->empty) {
709 snd_interval_none(c);
710 return;
711 }
712 c->empty = 0;
713 c->min = muldiv32(a->min, b->min, k, &r);
714 c->openmin = (r || a->openmin || b->openmin);
715 c->max = muldiv32(a->max, b->max, k, &r);
716 if (r) {
717 c->max++;
718 c->openmax = 1;
719 } else
720 c->openmax = (a->openmax || b->openmax);
721 c->integer = 0;
722}
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724
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732
733
734
735void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
736 const struct snd_interval *b, struct snd_interval *c)
737{
738 unsigned int r;
739 if (a->empty || b->empty) {
740 snd_interval_none(c);
741 return;
742 }
743 c->empty = 0;
744 c->min = muldiv32(a->min, k, b->max, &r);
745 c->openmin = (r || a->openmin || b->openmax);
746 if (b->min > 0) {
747 c->max = muldiv32(a->max, k, b->min, &r);
748 if (r) {
749 c->max++;
750 c->openmax = 1;
751 } else
752 c->openmax = (a->openmax || b->openmin);
753 } else {
754 c->max = UINT_MAX;
755 c->openmax = 0;
756 }
757 c->integer = 0;
758}
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774int snd_interval_ratnum(struct snd_interval *i,
775 unsigned int rats_count, const struct snd_ratnum *rats,
776 unsigned int *nump, unsigned int *denp)
777{
778 unsigned int best_num, best_den;
779 int best_diff;
780 unsigned int k;
781 struct snd_interval t;
782 int err;
783 unsigned int result_num, result_den;
784 int result_diff;
785
786 best_num = best_den = best_diff = 0;
787 for (k = 0; k < rats_count; ++k) {
788 unsigned int num = rats[k].num;
789 unsigned int den;
790 unsigned int q = i->min;
791 int diff;
792 if (q == 0)
793 q = 1;
794 den = div_up(num, q);
795 if (den < rats[k].den_min)
796 continue;
797 if (den > rats[k].den_max)
798 den = rats[k].den_max;
799 else {
800 unsigned int r;
801 r = (den - rats[k].den_min) % rats[k].den_step;
802 if (r != 0)
803 den -= r;
804 }
805 diff = num - q * den;
806 if (diff < 0)
807 diff = -diff;
808 if (best_num == 0 ||
809 diff * best_den < best_diff * den) {
810 best_diff = diff;
811 best_den = den;
812 best_num = num;
813 }
814 }
815 if (best_den == 0) {
816 i->empty = 1;
817 return -EINVAL;
818 }
819 t.min = div_down(best_num, best_den);
820 t.openmin = !!(best_num % best_den);
821
822 result_num = best_num;
823 result_diff = best_diff;
824 result_den = best_den;
825 best_num = best_den = best_diff = 0;
826 for (k = 0; k < rats_count; ++k) {
827 unsigned int num = rats[k].num;
828 unsigned int den;
829 unsigned int q = i->max;
830 int diff;
831 if (q == 0) {
832 i->empty = 1;
833 return -EINVAL;
834 }
835 den = div_down(num, q);
836 if (den > rats[k].den_max)
837 continue;
838 if (den < rats[k].den_min)
839 den = rats[k].den_min;
840 else {
841 unsigned int r;
842 r = (den - rats[k].den_min) % rats[k].den_step;
843 if (r != 0)
844 den += rats[k].den_step - r;
845 }
846 diff = q * den - num;
847 if (diff < 0)
848 diff = -diff;
849 if (best_num == 0 ||
850 diff * best_den < best_diff * den) {
851 best_diff = diff;
852 best_den = den;
853 best_num = num;
854 }
855 }
856 if (best_den == 0) {
857 i->empty = 1;
858 return -EINVAL;
859 }
860 t.max = div_up(best_num, best_den);
861 t.openmax = !!(best_num % best_den);
862 t.integer = 0;
863 err = snd_interval_refine(i, &t);
864 if (err < 0)
865 return err;
866
867 if (snd_interval_single(i)) {
868 if (best_diff * result_den < result_diff * best_den) {
869 result_num = best_num;
870 result_den = best_den;
871 }
872 if (nump)
873 *nump = result_num;
874 if (denp)
875 *denp = result_den;
876 }
877 return err;
878}
879EXPORT_SYMBOL(snd_interval_ratnum);
880
881
882
883
884
885
886
887
888
889
890
891
892static int snd_interval_ratden(struct snd_interval *i,
893 unsigned int rats_count,
894 const struct snd_ratden *rats,
895 unsigned int *nump, unsigned int *denp)
896{
897 unsigned int best_num, best_diff, best_den;
898 unsigned int k;
899 struct snd_interval t;
900 int err;
901
902 best_num = best_den = best_diff = 0;
903 for (k = 0; k < rats_count; ++k) {
904 unsigned int num;
905 unsigned int den = rats[k].den;
906 unsigned int q = i->min;
907 int diff;
908 num = mul(q, den);
909 if (num > rats[k].num_max)
910 continue;
911 if (num < rats[k].num_min)
912 num = rats[k].num_max;
913 else {
914 unsigned int r;
915 r = (num - rats[k].num_min) % rats[k].num_step;
916 if (r != 0)
917 num += rats[k].num_step - r;
918 }
919 diff = num - q * den;
920 if (best_num == 0 ||
921 diff * best_den < best_diff * den) {
922 best_diff = diff;
923 best_den = den;
924 best_num = num;
925 }
926 }
927 if (best_den == 0) {
928 i->empty = 1;
929 return -EINVAL;
930 }
931 t.min = div_down(best_num, best_den);
932 t.openmin = !!(best_num % best_den);
933
934 best_num = best_den = best_diff = 0;
935 for (k = 0; k < rats_count; ++k) {
936 unsigned int num;
937 unsigned int den = rats[k].den;
938 unsigned int q = i->max;
939 int diff;
940 num = mul(q, den);
941 if (num < rats[k].num_min)
942 continue;
943 if (num > rats[k].num_max)
944 num = rats[k].num_max;
945 else {
946 unsigned int r;
947 r = (num - rats[k].num_min) % rats[k].num_step;
948 if (r != 0)
949 num -= r;
950 }
951 diff = q * den - num;
952 if (best_num == 0 ||
953 diff * best_den < best_diff * den) {
954 best_diff = diff;
955 best_den = den;
956 best_num = num;
957 }
958 }
959 if (best_den == 0) {
960 i->empty = 1;
961 return -EINVAL;
962 }
963 t.max = div_up(best_num, best_den);
964 t.openmax = !!(best_num % best_den);
965 t.integer = 0;
966 err = snd_interval_refine(i, &t);
967 if (err < 0)
968 return err;
969
970 if (snd_interval_single(i)) {
971 if (nump)
972 *nump = best_num;
973 if (denp)
974 *denp = best_den;
975 }
976 return err;
977}
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993int snd_interval_list(struct snd_interval *i, unsigned int count,
994 const unsigned int *list, unsigned int mask)
995{
996 unsigned int k;
997 struct snd_interval list_range;
998
999 if (!count) {
1000 i->empty = 1;
1001 return -EINVAL;
1002 }
1003 snd_interval_any(&list_range);
1004 list_range.min = UINT_MAX;
1005 list_range.max = 0;
1006 for (k = 0; k < count; k++) {
1007 if (mask && !(mask & (1 << k)))
1008 continue;
1009 if (!snd_interval_test(i, list[k]))
1010 continue;
1011 list_range.min = min(list_range.min, list[k]);
1012 list_range.max = max(list_range.max, list[k]);
1013 }
1014 return snd_interval_refine(i, &list_range);
1015}
1016EXPORT_SYMBOL(snd_interval_list);
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1033 const struct snd_interval *ranges, unsigned int mask)
1034{
1035 unsigned int k;
1036 struct snd_interval range_union;
1037 struct snd_interval range;
1038
1039 if (!count) {
1040 snd_interval_none(i);
1041 return -EINVAL;
1042 }
1043 snd_interval_any(&range_union);
1044 range_union.min = UINT_MAX;
1045 range_union.max = 0;
1046 for (k = 0; k < count; k++) {
1047 if (mask && !(mask & (1 << k)))
1048 continue;
1049 snd_interval_copy(&range, &ranges[k]);
1050 if (snd_interval_refine(&range, i) < 0)
1051 continue;
1052 if (snd_interval_empty(&range))
1053 continue;
1054
1055 if (range.min < range_union.min) {
1056 range_union.min = range.min;
1057 range_union.openmin = 1;
1058 }
1059 if (range.min == range_union.min && !range.openmin)
1060 range_union.openmin = 0;
1061 if (range.max > range_union.max) {
1062 range_union.max = range.max;
1063 range_union.openmax = 1;
1064 }
1065 if (range.max == range_union.max && !range.openmax)
1066 range_union.openmax = 0;
1067 }
1068 return snd_interval_refine(i, &range_union);
1069}
1070EXPORT_SYMBOL(snd_interval_ranges);
1071
1072static int snd_interval_step(struct snd_interval *i, unsigned int step)
1073{
1074 unsigned int n;
1075 int changed = 0;
1076 n = i->min % step;
1077 if (n != 0 || i->openmin) {
1078 i->min += step - n;
1079 i->openmin = 0;
1080 changed = 1;
1081 }
1082 n = i->max % step;
1083 if (n != 0 || i->openmax) {
1084 i->max -= n;
1085 i->openmax = 0;
1086 changed = 1;
1087 }
1088 if (snd_interval_checkempty(i)) {
1089 i->empty = 1;
1090 return -EINVAL;
1091 }
1092 return changed;
1093}
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1109 int var,
1110 snd_pcm_hw_rule_func_t func, void *private,
1111 int dep, ...)
1112{
1113 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1114 struct snd_pcm_hw_rule *c;
1115 unsigned int k;
1116 va_list args;
1117 va_start(args, dep);
1118 if (constrs->rules_num >= constrs->rules_all) {
1119 struct snd_pcm_hw_rule *new;
1120 unsigned int new_rules = constrs->rules_all + 16;
1121 new = krealloc(constrs->rules, new_rules * sizeof(*c),
1122 GFP_KERNEL);
1123 if (!new) {
1124 va_end(args);
1125 return -ENOMEM;
1126 }
1127 constrs->rules = new;
1128 constrs->rules_all = new_rules;
1129 }
1130 c = &constrs->rules[constrs->rules_num];
1131 c->cond = cond;
1132 c->func = func;
1133 c->var = var;
1134 c->private = private;
1135 k = 0;
1136 while (1) {
1137 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1138 va_end(args);
1139 return -EINVAL;
1140 }
1141 c->deps[k++] = dep;
1142 if (dep < 0)
1143 break;
1144 dep = va_arg(args, int);
1145 }
1146 constrs->rules_num++;
1147 va_end(args);
1148 return 0;
1149}
1150EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1163 u_int32_t mask)
1164{
1165 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1166 struct snd_mask *maskp = constrs_mask(constrs, var);
1167 *maskp->bits &= mask;
1168 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8);
1169 if (*maskp->bits == 0)
1170 return -EINVAL;
1171 return 0;
1172}
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1185 u_int64_t mask)
1186{
1187 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1188 struct snd_mask *maskp = constrs_mask(constrs, var);
1189 maskp->bits[0] &= (u_int32_t)mask;
1190 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1191 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8);
1192 if (! maskp->bits[0] && ! maskp->bits[1])
1193 return -EINVAL;
1194 return 0;
1195}
1196EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1209{
1210 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1211 return snd_interval_setinteger(constrs_interval(constrs, var));
1212}
1213EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1228 unsigned int min, unsigned int max)
1229{
1230 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1231 struct snd_interval t;
1232 t.min = min;
1233 t.max = max;
1234 t.openmin = t.openmax = 0;
1235 t.integer = 0;
1236 return snd_interval_refine(constrs_interval(constrs, var), &t);
1237}
1238EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1239
1240static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1241 struct snd_pcm_hw_rule *rule)
1242{
1243 struct snd_pcm_hw_constraint_list *list = rule->private;
1244 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1245}
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1260 unsigned int cond,
1261 snd_pcm_hw_param_t var,
1262 const struct snd_pcm_hw_constraint_list *l)
1263{
1264 return snd_pcm_hw_rule_add(runtime, cond, var,
1265 snd_pcm_hw_rule_list, (void *)l,
1266 var, -1);
1267}
1268EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1269
1270static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
1271 struct snd_pcm_hw_rule *rule)
1272{
1273 struct snd_pcm_hw_constraint_ranges *r = rule->private;
1274 return snd_interval_ranges(hw_param_interval(params, rule->var),
1275 r->count, r->ranges, r->mask);
1276}
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1291 unsigned int cond,
1292 snd_pcm_hw_param_t var,
1293 const struct snd_pcm_hw_constraint_ranges *r)
1294{
1295 return snd_pcm_hw_rule_add(runtime, cond, var,
1296 snd_pcm_hw_rule_ranges, (void *)r,
1297 var, -1);
1298}
1299EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
1300
1301static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1302 struct snd_pcm_hw_rule *rule)
1303{
1304 const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1305 unsigned int num = 0, den = 0;
1306 int err;
1307 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1308 r->nrats, r->rats, &num, &den);
1309 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1310 params->rate_num = num;
1311 params->rate_den = den;
1312 }
1313 return err;
1314}
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1326 unsigned int cond,
1327 snd_pcm_hw_param_t var,
1328 const struct snd_pcm_hw_constraint_ratnums *r)
1329{
1330 return snd_pcm_hw_rule_add(runtime, cond, var,
1331 snd_pcm_hw_rule_ratnums, (void *)r,
1332 var, -1);
1333}
1334EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1335
1336static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1337 struct snd_pcm_hw_rule *rule)
1338{
1339 const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1340 unsigned int num = 0, den = 0;
1341 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1342 r->nrats, r->rats, &num, &den);
1343 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1344 params->rate_num = num;
1345 params->rate_den = den;
1346 }
1347 return err;
1348}
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1360 unsigned int cond,
1361 snd_pcm_hw_param_t var,
1362 const struct snd_pcm_hw_constraint_ratdens *r)
1363{
1364 return snd_pcm_hw_rule_add(runtime, cond, var,
1365 snd_pcm_hw_rule_ratdens, (void *)r,
1366 var, -1);
1367}
1368EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1369
1370static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1371 struct snd_pcm_hw_rule *rule)
1372{
1373 unsigned int l = (unsigned long) rule->private;
1374 int width = l & 0xffff;
1375 unsigned int msbits = l >> 16;
1376 const struct snd_interval *i =
1377 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1378
1379 if (!snd_interval_single(i))
1380 return 0;
1381
1382 if ((snd_interval_value(i) == width) ||
1383 (width == 0 && snd_interval_value(i) > msbits))
1384 params->msbits = min_not_zero(params->msbits, msbits);
1385
1386 return 0;
1387}
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1404 unsigned int cond,
1405 unsigned int width,
1406 unsigned int msbits)
1407{
1408 unsigned long l = (msbits << 16) | width;
1409 return snd_pcm_hw_rule_add(runtime, cond, -1,
1410 snd_pcm_hw_rule_msbits,
1411 (void*) l,
1412 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1413}
1414EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1415
1416static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1417 struct snd_pcm_hw_rule *rule)
1418{
1419 unsigned long step = (unsigned long) rule->private;
1420 return snd_interval_step(hw_param_interval(params, rule->var), step);
1421}
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1433 unsigned int cond,
1434 snd_pcm_hw_param_t var,
1435 unsigned long step)
1436{
1437 return snd_pcm_hw_rule_add(runtime, cond, var,
1438 snd_pcm_hw_rule_step, (void *) step,
1439 var, -1);
1440}
1441EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1442
1443static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1444{
1445 static unsigned int pow2_sizes[] = {
1446 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1447 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1448 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1449 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1450 };
1451 return snd_interval_list(hw_param_interval(params, rule->var),
1452 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1453}
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1464 unsigned int cond,
1465 snd_pcm_hw_param_t var)
1466{
1467 return snd_pcm_hw_rule_add(runtime, cond, var,
1468 snd_pcm_hw_rule_pow2, NULL,
1469 var, -1);
1470}
1471EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1472
1473static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1474 struct snd_pcm_hw_rule *rule)
1475{
1476 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1477 struct snd_interval *rate;
1478
1479 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1480 return snd_interval_list(rate, 1, &base_rate, 0);
1481}
1482
1483
1484
1485
1486
1487
1488
1489
1490int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1491 unsigned int base_rate)
1492{
1493 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1494 SNDRV_PCM_HW_PARAM_RATE,
1495 snd_pcm_hw_rule_noresample_func,
1496 (void *)(uintptr_t)base_rate,
1497 SNDRV_PCM_HW_PARAM_RATE, -1);
1498}
1499EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1500
1501static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1502 snd_pcm_hw_param_t var)
1503{
1504 if (hw_is_mask(var)) {
1505 snd_mask_any(hw_param_mask(params, var));
1506 params->cmask |= 1 << var;
1507 params->rmask |= 1 << var;
1508 return;
1509 }
1510 if (hw_is_interval(var)) {
1511 snd_interval_any(hw_param_interval(params, var));
1512 params->cmask |= 1 << var;
1513 params->rmask |= 1 << var;
1514 return;
1515 }
1516 snd_BUG();
1517}
1518
1519void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1520{
1521 unsigned int k;
1522 memset(params, 0, sizeof(*params));
1523 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1524 _snd_pcm_hw_param_any(params, k);
1525 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1526 _snd_pcm_hw_param_any(params, k);
1527 params->info = ~0U;
1528}
1529EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1541 snd_pcm_hw_param_t var, int *dir)
1542{
1543 if (hw_is_mask(var)) {
1544 const struct snd_mask *mask = hw_param_mask_c(params, var);
1545 if (!snd_mask_single(mask))
1546 return -EINVAL;
1547 if (dir)
1548 *dir = 0;
1549 return snd_mask_value(mask);
1550 }
1551 if (hw_is_interval(var)) {
1552 const struct snd_interval *i = hw_param_interval_c(params, var);
1553 if (!snd_interval_single(i))
1554 return -EINVAL;
1555 if (dir)
1556 *dir = i->openmin;
1557 return snd_interval_value(i);
1558 }
1559 return -EINVAL;
1560}
1561EXPORT_SYMBOL(snd_pcm_hw_param_value);
1562
1563void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1564 snd_pcm_hw_param_t var)
1565{
1566 if (hw_is_mask(var)) {
1567 snd_mask_none(hw_param_mask(params, var));
1568 params->cmask |= 1 << var;
1569 params->rmask |= 1 << var;
1570 } else if (hw_is_interval(var)) {
1571 snd_interval_none(hw_param_interval(params, var));
1572 params->cmask |= 1 << var;
1573 params->rmask |= 1 << var;
1574 } else {
1575 snd_BUG();
1576 }
1577}
1578EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1579
1580static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1581 snd_pcm_hw_param_t var)
1582{
1583 int changed;
1584 if (hw_is_mask(var))
1585 changed = snd_mask_refine_first(hw_param_mask(params, var));
1586 else if (hw_is_interval(var))
1587 changed = snd_interval_refine_first(hw_param_interval(params, var));
1588 else
1589 return -EINVAL;
1590 if (changed > 0) {
1591 params->cmask |= 1 << var;
1592 params->rmask |= 1 << var;
1593 }
1594 return changed;
1595}
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1611 struct snd_pcm_hw_params *params,
1612 snd_pcm_hw_param_t var, int *dir)
1613{
1614 int changed = _snd_pcm_hw_param_first(params, var);
1615 if (changed < 0)
1616 return changed;
1617 if (params->rmask) {
1618 int err = snd_pcm_hw_refine(pcm, params);
1619 if (err < 0)
1620 return err;
1621 }
1622 return snd_pcm_hw_param_value(params, var, dir);
1623}
1624EXPORT_SYMBOL(snd_pcm_hw_param_first);
1625
1626static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1627 snd_pcm_hw_param_t var)
1628{
1629 int changed;
1630 if (hw_is_mask(var))
1631 changed = snd_mask_refine_last(hw_param_mask(params, var));
1632 else if (hw_is_interval(var))
1633 changed = snd_interval_refine_last(hw_param_interval(params, var));
1634 else
1635 return -EINVAL;
1636 if (changed > 0) {
1637 params->cmask |= 1 << var;
1638 params->rmask |= 1 << var;
1639 }
1640 return changed;
1641}
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1657 struct snd_pcm_hw_params *params,
1658 snd_pcm_hw_param_t var, int *dir)
1659{
1660 int changed = _snd_pcm_hw_param_last(params, var);
1661 if (changed < 0)
1662 return changed;
1663 if (params->rmask) {
1664 int err = snd_pcm_hw_refine(pcm, params);
1665 if (err < 0)
1666 return err;
1667 }
1668 return snd_pcm_hw_param_value(params, var, dir);
1669}
1670EXPORT_SYMBOL(snd_pcm_hw_param_last);
1671
1672static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1673 void *arg)
1674{
1675 struct snd_pcm_runtime *runtime = substream->runtime;
1676 unsigned long flags;
1677 snd_pcm_stream_lock_irqsave(substream, flags);
1678 if (snd_pcm_running(substream) &&
1679 snd_pcm_update_hw_ptr(substream) >= 0)
1680 runtime->status->hw_ptr %= runtime->buffer_size;
1681 else {
1682 runtime->status->hw_ptr = 0;
1683 runtime->hw_ptr_wrap = 0;
1684 }
1685 snd_pcm_stream_unlock_irqrestore(substream, flags);
1686 return 0;
1687}
1688
1689static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1690 void *arg)
1691{
1692 struct snd_pcm_channel_info *info = arg;
1693 struct snd_pcm_runtime *runtime = substream->runtime;
1694 int width;
1695 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1696 info->offset = -1;
1697 return 0;
1698 }
1699 width = snd_pcm_format_physical_width(runtime->format);
1700 if (width < 0)
1701 return width;
1702 info->offset = 0;
1703 switch (runtime->access) {
1704 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1705 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1706 info->first = info->channel * width;
1707 info->step = runtime->channels * width;
1708 break;
1709 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1710 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1711 {
1712 size_t size = runtime->dma_bytes / runtime->channels;
1713 info->first = info->channel * size * 8;
1714 info->step = width;
1715 break;
1716 }
1717 default:
1718 snd_BUG();
1719 break;
1720 }
1721 return 0;
1722}
1723
1724static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1725 void *arg)
1726{
1727 struct snd_pcm_hw_params *params = arg;
1728 snd_pcm_format_t format;
1729 int channels;
1730 ssize_t frame_size;
1731
1732 params->fifo_size = substream->runtime->hw.fifo_size;
1733 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1734 format = params_format(params);
1735 channels = params_channels(params);
1736 frame_size = snd_pcm_format_size(format, channels);
1737 if (frame_size > 0)
1738 params->fifo_size /= (unsigned)frame_size;
1739 }
1740 return 0;
1741}
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1755 unsigned int cmd, void *arg)
1756{
1757 switch (cmd) {
1758 case SNDRV_PCM_IOCTL1_RESET:
1759 return snd_pcm_lib_ioctl_reset(substream, arg);
1760 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1761 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1762 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1763 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1764 }
1765 return -ENXIO;
1766}
1767EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1781{
1782 struct snd_pcm_runtime *runtime;
1783 unsigned long flags;
1784
1785 if (PCM_RUNTIME_CHECK(substream))
1786 return;
1787 runtime = substream->runtime;
1788
1789 snd_pcm_stream_lock_irqsave(substream, flags);
1790 if (!snd_pcm_running(substream) ||
1791 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1792 goto _end;
1793
1794#ifdef CONFIG_SND_PCM_TIMER
1795 if (substream->timer_running)
1796 snd_timer_interrupt(substream->timer, 1);
1797#endif
1798 _end:
1799 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1800 snd_pcm_stream_unlock_irqrestore(substream, flags);
1801}
1802EXPORT_SYMBOL(snd_pcm_period_elapsed);
1803
1804
1805
1806
1807
1808
1809
1810static int wait_for_avail(struct snd_pcm_substream *substream,
1811 snd_pcm_uframes_t *availp)
1812{
1813 struct snd_pcm_runtime *runtime = substream->runtime;
1814 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1815 wait_queue_entry_t wait;
1816 int err = 0;
1817 snd_pcm_uframes_t avail = 0;
1818 long wait_time, tout;
1819
1820 init_waitqueue_entry(&wait, current);
1821 set_current_state(TASK_INTERRUPTIBLE);
1822 add_wait_queue(&runtime->tsleep, &wait);
1823
1824 if (runtime->no_period_wakeup)
1825 wait_time = MAX_SCHEDULE_TIMEOUT;
1826 else {
1827
1828 if (substream->wait_time) {
1829 wait_time = substream->wait_time;
1830 } else {
1831 wait_time = 10;
1832
1833 if (runtime->rate) {
1834 long t = runtime->period_size * 2 /
1835 runtime->rate;
1836 wait_time = max(t, wait_time);
1837 }
1838 wait_time = msecs_to_jiffies(wait_time * 1000);
1839 }
1840 }
1841
1842 for (;;) {
1843 if (signal_pending(current)) {
1844 err = -ERESTARTSYS;
1845 break;
1846 }
1847
1848
1849
1850
1851
1852
1853
1854
1855 avail = snd_pcm_avail(substream);
1856 if (avail >= runtime->twake)
1857 break;
1858 snd_pcm_stream_unlock_irq(substream);
1859
1860 tout = schedule_timeout(wait_time);
1861
1862 snd_pcm_stream_lock_irq(substream);
1863 set_current_state(TASK_INTERRUPTIBLE);
1864 switch (runtime->status->state) {
1865 case SNDRV_PCM_STATE_SUSPENDED:
1866 err = -ESTRPIPE;
1867 goto _endloop;
1868 case SNDRV_PCM_STATE_XRUN:
1869 err = -EPIPE;
1870 goto _endloop;
1871 case SNDRV_PCM_STATE_DRAINING:
1872 if (is_playback)
1873 err = -EPIPE;
1874 else
1875 avail = 0;
1876 goto _endloop;
1877 case SNDRV_PCM_STATE_OPEN:
1878 case SNDRV_PCM_STATE_SETUP:
1879 case SNDRV_PCM_STATE_DISCONNECTED:
1880 err = -EBADFD;
1881 goto _endloop;
1882 case SNDRV_PCM_STATE_PAUSED:
1883 continue;
1884 }
1885 if (!tout) {
1886 pcm_dbg(substream->pcm,
1887 "%s write error (DMA or IRQ trouble?)\n",
1888 is_playback ? "playback" : "capture");
1889 err = -EIO;
1890 break;
1891 }
1892 }
1893 _endloop:
1894 set_current_state(TASK_RUNNING);
1895 remove_wait_queue(&runtime->tsleep, &wait);
1896 *availp = avail;
1897 return err;
1898}
1899
1900typedef int (*pcm_transfer_f)(struct snd_pcm_substream *substream,
1901 int channel, unsigned long hwoff,
1902 void *buf, unsigned long bytes);
1903
1904typedef int (*pcm_copy_f)(struct snd_pcm_substream *, snd_pcm_uframes_t, void *,
1905 snd_pcm_uframes_t, snd_pcm_uframes_t, pcm_transfer_f);
1906
1907
1908static void *get_dma_ptr(struct snd_pcm_runtime *runtime,
1909 int channel, unsigned long hwoff)
1910{
1911 return runtime->dma_area + hwoff +
1912 channel * (runtime->dma_bytes / runtime->channels);
1913}
1914
1915
1916static int default_write_copy(struct snd_pcm_substream *substream,
1917 int channel, unsigned long hwoff,
1918 void *buf, unsigned long bytes)
1919{
1920 if (copy_from_user(get_dma_ptr(substream->runtime, channel, hwoff),
1921 (void __user *)buf, bytes))
1922 return -EFAULT;
1923 return 0;
1924}
1925
1926
1927static int default_write_copy_kernel(struct snd_pcm_substream *substream,
1928 int channel, unsigned long hwoff,
1929 void *buf, unsigned long bytes)
1930{
1931 memcpy(get_dma_ptr(substream->runtime, channel, hwoff), buf, bytes);
1932 return 0;
1933}
1934
1935
1936
1937
1938
1939static int fill_silence(struct snd_pcm_substream *substream, int channel,
1940 unsigned long hwoff, void *buf, unsigned long bytes)
1941{
1942 struct snd_pcm_runtime *runtime = substream->runtime;
1943
1944 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
1945 return 0;
1946 if (substream->ops->fill_silence)
1947 return substream->ops->fill_silence(substream, channel,
1948 hwoff, bytes);
1949
1950 snd_pcm_format_set_silence(runtime->format,
1951 get_dma_ptr(runtime, channel, hwoff),
1952 bytes_to_samples(runtime, bytes));
1953 return 0;
1954}
1955
1956
1957static int default_read_copy(struct snd_pcm_substream *substream,
1958 int channel, unsigned long hwoff,
1959 void *buf, unsigned long bytes)
1960{
1961 if (copy_to_user((void __user *)buf,
1962 get_dma_ptr(substream->runtime, channel, hwoff),
1963 bytes))
1964 return -EFAULT;
1965 return 0;
1966}
1967
1968
1969static int default_read_copy_kernel(struct snd_pcm_substream *substream,
1970 int channel, unsigned long hwoff,
1971 void *buf, unsigned long bytes)
1972{
1973 memcpy(buf, get_dma_ptr(substream->runtime, channel, hwoff), bytes);
1974 return 0;
1975}
1976
1977
1978
1979
1980static int interleaved_copy(struct snd_pcm_substream *substream,
1981 snd_pcm_uframes_t hwoff, void *data,
1982 snd_pcm_uframes_t off,
1983 snd_pcm_uframes_t frames,
1984 pcm_transfer_f transfer)
1985{
1986 struct snd_pcm_runtime *runtime = substream->runtime;
1987
1988
1989 hwoff = frames_to_bytes(runtime, hwoff);
1990 off = frames_to_bytes(runtime, off);
1991 frames = frames_to_bytes(runtime, frames);
1992 return transfer(substream, 0, hwoff, data + off, frames);
1993}
1994
1995
1996
1997
1998static int noninterleaved_copy(struct snd_pcm_substream *substream,
1999 snd_pcm_uframes_t hwoff, void *data,
2000 snd_pcm_uframes_t off,
2001 snd_pcm_uframes_t frames,
2002 pcm_transfer_f transfer)
2003{
2004 struct snd_pcm_runtime *runtime = substream->runtime;
2005 int channels = runtime->channels;
2006 void **bufs = data;
2007 int c, err;
2008
2009
2010
2011
2012
2013 off = samples_to_bytes(runtime, off);
2014 frames = samples_to_bytes(runtime, frames);
2015 hwoff = samples_to_bytes(runtime, hwoff);
2016 for (c = 0; c < channels; ++c, ++bufs) {
2017 if (!data || !*bufs)
2018 err = fill_silence(substream, c, hwoff, NULL, frames);
2019 else
2020 err = transfer(substream, c, hwoff, *bufs + off,
2021 frames);
2022 if (err < 0)
2023 return err;
2024 }
2025 return 0;
2026}
2027
2028
2029
2030
2031static int fill_silence_frames(struct snd_pcm_substream *substream,
2032 snd_pcm_uframes_t off, snd_pcm_uframes_t frames)
2033{
2034 if (substream->runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
2035 substream->runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)
2036 return interleaved_copy(substream, off, NULL, 0, frames,
2037 fill_silence);
2038 else
2039 return noninterleaved_copy(substream, off, NULL, 0, frames,
2040 fill_silence);
2041}
2042
2043
2044static int pcm_sanity_check(struct snd_pcm_substream *substream)
2045{
2046 struct snd_pcm_runtime *runtime;
2047 if (PCM_RUNTIME_CHECK(substream))
2048 return -ENXIO;
2049 runtime = substream->runtime;
2050 if (snd_BUG_ON(!substream->ops->copy_user && !runtime->dma_area))
2051 return -EINVAL;
2052 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2053 return -EBADFD;
2054 return 0;
2055}
2056
2057static int pcm_accessible_state(struct snd_pcm_runtime *runtime)
2058{
2059 switch (runtime->status->state) {
2060 case SNDRV_PCM_STATE_PREPARED:
2061 case SNDRV_PCM_STATE_RUNNING:
2062 case SNDRV_PCM_STATE_PAUSED:
2063 return 0;
2064 case SNDRV_PCM_STATE_XRUN:
2065 return -EPIPE;
2066 case SNDRV_PCM_STATE_SUSPENDED:
2067 return -ESTRPIPE;
2068 default:
2069 return -EBADFD;
2070 }
2071}
2072
2073
2074
2075
2076int pcm_lib_apply_appl_ptr(struct snd_pcm_substream *substream,
2077 snd_pcm_uframes_t appl_ptr)
2078{
2079 struct snd_pcm_runtime *runtime = substream->runtime;
2080 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
2081 int ret;
2082
2083 if (old_appl_ptr == appl_ptr)
2084 return 0;
2085
2086 runtime->control->appl_ptr = appl_ptr;
2087 if (substream->ops->ack) {
2088 ret = substream->ops->ack(substream);
2089 if (ret < 0) {
2090 runtime->control->appl_ptr = old_appl_ptr;
2091 return ret;
2092 }
2093 }
2094
2095 trace_applptr(substream, old_appl_ptr, appl_ptr);
2096
2097 return 0;
2098}
2099
2100
2101snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
2102 void *data, bool interleaved,
2103 snd_pcm_uframes_t size, bool in_kernel)
2104{
2105 struct snd_pcm_runtime *runtime = substream->runtime;
2106 snd_pcm_uframes_t xfer = 0;
2107 snd_pcm_uframes_t offset = 0;
2108 snd_pcm_uframes_t avail;
2109 pcm_copy_f writer;
2110 pcm_transfer_f transfer;
2111 bool nonblock;
2112 bool is_playback;
2113 int err;
2114
2115 err = pcm_sanity_check(substream);
2116 if (err < 0)
2117 return err;
2118
2119 is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
2120 if (interleaved) {
2121 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2122 runtime->channels > 1)
2123 return -EINVAL;
2124 writer = interleaved_copy;
2125 } else {
2126 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2127 return -EINVAL;
2128 writer = noninterleaved_copy;
2129 }
2130
2131 if (!data) {
2132 if (is_playback)
2133 transfer = fill_silence;
2134 else
2135 return -EINVAL;
2136 } else if (in_kernel) {
2137 if (substream->ops->copy_kernel)
2138 transfer = substream->ops->copy_kernel;
2139 else
2140 transfer = is_playback ?
2141 default_write_copy_kernel : default_read_copy_kernel;
2142 } else {
2143 if (substream->ops->copy_user)
2144 transfer = (pcm_transfer_f)substream->ops->copy_user;
2145 else
2146 transfer = is_playback ?
2147 default_write_copy : default_read_copy;
2148 }
2149
2150 if (size == 0)
2151 return 0;
2152
2153 nonblock = !!(substream->f_flags & O_NONBLOCK);
2154
2155 snd_pcm_stream_lock_irq(substream);
2156 err = pcm_accessible_state(runtime);
2157 if (err < 0)
2158 goto _end_unlock;
2159
2160 runtime->twake = runtime->control->avail_min ? : 1;
2161 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2162 snd_pcm_update_hw_ptr(substream);
2163
2164
2165
2166
2167
2168 if (!is_playback &&
2169 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2170 size >= runtime->start_threshold) {
2171 err = snd_pcm_start(substream);
2172 if (err < 0)
2173 goto _end_unlock;
2174 }
2175
2176 avail = snd_pcm_avail(substream);
2177
2178 while (size > 0) {
2179 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2180 snd_pcm_uframes_t cont;
2181 if (!avail) {
2182 if (!is_playback &&
2183 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2184 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2185 goto _end_unlock;
2186 }
2187 if (nonblock) {
2188 err = -EAGAIN;
2189 goto _end_unlock;
2190 }
2191 runtime->twake = min_t(snd_pcm_uframes_t, size,
2192 runtime->control->avail_min ? : 1);
2193 err = wait_for_avail(substream, &avail);
2194 if (err < 0)
2195 goto _end_unlock;
2196 if (!avail)
2197 continue;
2198 }
2199 frames = size > avail ? avail : size;
2200 appl_ptr = READ_ONCE(runtime->control->appl_ptr);
2201 appl_ofs = appl_ptr % runtime->buffer_size;
2202 cont = runtime->buffer_size - appl_ofs;
2203 if (frames > cont)
2204 frames = cont;
2205 if (snd_BUG_ON(!frames)) {
2206 err = -EINVAL;
2207 goto _end_unlock;
2208 }
2209 snd_pcm_stream_unlock_irq(substream);
2210 err = writer(substream, appl_ofs, data, offset, frames,
2211 transfer);
2212 snd_pcm_stream_lock_irq(substream);
2213 if (err < 0)
2214 goto _end_unlock;
2215 err = pcm_accessible_state(runtime);
2216 if (err < 0)
2217 goto _end_unlock;
2218 appl_ptr += frames;
2219 if (appl_ptr >= runtime->boundary)
2220 appl_ptr -= runtime->boundary;
2221 err = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2222 if (err < 0)
2223 goto _end_unlock;
2224
2225 offset += frames;
2226 size -= frames;
2227 xfer += frames;
2228 avail -= frames;
2229 if (is_playback &&
2230 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2231 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2232 err = snd_pcm_start(substream);
2233 if (err < 0)
2234 goto _end_unlock;
2235 }
2236 }
2237 _end_unlock:
2238 runtime->twake = 0;
2239 if (xfer > 0 && err >= 0)
2240 snd_pcm_update_state(substream, runtime);
2241 snd_pcm_stream_unlock_irq(substream);
2242 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2243}
2244EXPORT_SYMBOL(__snd_pcm_lib_xfer);
2245
2246
2247
2248
2249
2250
2251const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2252 { .channels = 1,
2253 .map = { SNDRV_CHMAP_MONO } },
2254 { .channels = 2,
2255 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2256 { .channels = 4,
2257 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2258 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2259 { .channels = 6,
2260 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2261 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2262 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2263 { .channels = 8,
2264 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2265 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2266 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2267 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2268 { }
2269};
2270EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2271
2272
2273const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2274 { .channels = 1,
2275 .map = { SNDRV_CHMAP_MONO } },
2276 { .channels = 2,
2277 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2278 { .channels = 4,
2279 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2280 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2281 { .channels = 6,
2282 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2283 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2284 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2285 { .channels = 8,
2286 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2287 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2288 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2289 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2290 { }
2291};
2292EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2293
2294static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2295{
2296 if (ch > info->max_channels)
2297 return false;
2298 return !info->channel_mask || (info->channel_mask & (1U << ch));
2299}
2300
2301static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2302 struct snd_ctl_elem_info *uinfo)
2303{
2304 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2305
2306 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2307 uinfo->count = 0;
2308 uinfo->count = info->max_channels;
2309 uinfo->value.integer.min = 0;
2310 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2311 return 0;
2312}
2313
2314
2315
2316
2317static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2318 struct snd_ctl_elem_value *ucontrol)
2319{
2320 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2321 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2322 struct snd_pcm_substream *substream;
2323 const struct snd_pcm_chmap_elem *map;
2324
2325 if (!info->chmap)
2326 return -EINVAL;
2327 substream = snd_pcm_chmap_substream(info, idx);
2328 if (!substream)
2329 return -ENODEV;
2330 memset(ucontrol->value.integer.value, 0,
2331 sizeof(ucontrol->value.integer.value));
2332 if (!substream->runtime)
2333 return 0;
2334 for (map = info->chmap; map->channels; map++) {
2335 int i;
2336 if (map->channels == substream->runtime->channels &&
2337 valid_chmap_channels(info, map->channels)) {
2338 for (i = 0; i < map->channels; i++)
2339 ucontrol->value.integer.value[i] = map->map[i];
2340 return 0;
2341 }
2342 }
2343 return -EINVAL;
2344}
2345
2346
2347
2348
2349static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2350 unsigned int size, unsigned int __user *tlv)
2351{
2352 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2353 const struct snd_pcm_chmap_elem *map;
2354 unsigned int __user *dst;
2355 int c, count = 0;
2356
2357 if (!info->chmap)
2358 return -EINVAL;
2359 if (size < 8)
2360 return -ENOMEM;
2361 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2362 return -EFAULT;
2363 size -= 8;
2364 dst = tlv + 2;
2365 for (map = info->chmap; map->channels; map++) {
2366 int chs_bytes = map->channels * 4;
2367 if (!valid_chmap_channels(info, map->channels))
2368 continue;
2369 if (size < 8)
2370 return -ENOMEM;
2371 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2372 put_user(chs_bytes, dst + 1))
2373 return -EFAULT;
2374 dst += 2;
2375 size -= 8;
2376 count += 8;
2377 if (size < chs_bytes)
2378 return -ENOMEM;
2379 size -= chs_bytes;
2380 count += chs_bytes;
2381 for (c = 0; c < map->channels; c++) {
2382 if (put_user(map->map[c], dst))
2383 return -EFAULT;
2384 dst++;
2385 }
2386 }
2387 if (put_user(count, tlv + 1))
2388 return -EFAULT;
2389 return 0;
2390}
2391
2392static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2393{
2394 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2395 info->pcm->streams[info->stream].chmap_kctl = NULL;
2396 kfree(info);
2397}
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2412 const struct snd_pcm_chmap_elem *chmap,
2413 int max_channels,
2414 unsigned long private_value,
2415 struct snd_pcm_chmap **info_ret)
2416{
2417 struct snd_pcm_chmap *info;
2418 struct snd_kcontrol_new knew = {
2419 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2420 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2421 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2422 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2423 .info = pcm_chmap_ctl_info,
2424 .get = pcm_chmap_ctl_get,
2425 .tlv.c = pcm_chmap_ctl_tlv,
2426 };
2427 int err;
2428
2429 if (WARN_ON(pcm->streams[stream].chmap_kctl))
2430 return -EBUSY;
2431 info = kzalloc(sizeof(*info), GFP_KERNEL);
2432 if (!info)
2433 return -ENOMEM;
2434 info->pcm = pcm;
2435 info->stream = stream;
2436 info->chmap = chmap;
2437 info->max_channels = max_channels;
2438 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2439 knew.name = "Playback Channel Map";
2440 else
2441 knew.name = "Capture Channel Map";
2442 knew.device = pcm->device;
2443 knew.count = pcm->streams[stream].substream_count;
2444 knew.private_value = private_value;
2445 info->kctl = snd_ctl_new1(&knew, info);
2446 if (!info->kctl) {
2447 kfree(info);
2448 return -ENOMEM;
2449 }
2450 info->kctl->private_free = pcm_chmap_ctl_private_free;
2451 err = snd_ctl_add(pcm->card, info->kctl);
2452 if (err < 0)
2453 return err;
2454 pcm->streams[stream].chmap_kctl = info->kctl;
2455 if (info_ret)
2456 *info_ret = info;
2457 return 0;
2458}
2459EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);
2460