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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 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
110}
111
112#ifdef CONFIG_SND_DEBUG
113void snd_pcm_debug_name(struct snd_pcm_substream *substream,
114 char *name, size_t len)
115{
116 snprintf(name, len, "pcmC%dD%d%c:%d",
117 substream->pcm->card->number,
118 substream->pcm->device,
119 substream->stream ? 'c' : 'p',
120 substream->number);
121}
122EXPORT_SYMBOL(snd_pcm_debug_name);
123#endif
124
125#define XRUN_DEBUG_BASIC (1<<0)
126#define XRUN_DEBUG_STACK (1<<1)
127#define XRUN_DEBUG_JIFFIESCHECK (1<<2)
128
129#ifdef CONFIG_SND_PCM_XRUN_DEBUG
130
131#define xrun_debug(substream, mask) \
132 ((substream)->pstr->xrun_debug & (mask))
133#else
134#define xrun_debug(substream, mask) 0
135#endif
136
137#define dump_stack_on_xrun(substream) do { \
138 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
139 dump_stack(); \
140 } while (0)
141
142
143void __snd_pcm_xrun(struct snd_pcm_substream *substream)
144{
145 struct snd_pcm_runtime *runtime = substream->runtime;
146
147 trace_xrun(substream);
148 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
149 struct timespec64 tstamp;
150
151 snd_pcm_gettime(runtime, &tstamp);
152 runtime->status->tstamp.tv_sec = tstamp.tv_sec;
153 runtime->status->tstamp.tv_nsec = tstamp.tv_nsec;
154 }
155 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
156 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
157 char name[16];
158 snd_pcm_debug_name(substream, name, sizeof(name));
159 pcm_warn(substream->pcm, "XRUN: %s\n", name);
160 dump_stack_on_xrun(substream);
161 }
162}
163
164#ifdef CONFIG_SND_PCM_XRUN_DEBUG
165#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
166 do { \
167 trace_hw_ptr_error(substream, reason); \
168 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
169 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
170 (in_interrupt) ? 'Q' : 'P', ##args); \
171 dump_stack_on_xrun(substream); \
172 } \
173 } while (0)
174
175#else
176
177#define hw_ptr_error(substream, fmt, args...) do { } while (0)
178
179#endif
180
181int snd_pcm_update_state(struct snd_pcm_substream *substream,
182 struct snd_pcm_runtime *runtime)
183{
184 snd_pcm_uframes_t avail;
185
186 avail = snd_pcm_avail(substream);
187 if (avail > runtime->avail_max)
188 runtime->avail_max = avail;
189 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
190 if (avail >= runtime->buffer_size) {
191 snd_pcm_drain_done(substream);
192 return -EPIPE;
193 }
194 } else {
195 if (avail >= runtime->stop_threshold) {
196 __snd_pcm_xrun(substream);
197 return -EPIPE;
198 }
199 }
200 if (runtime->twake) {
201 if (avail >= runtime->twake)
202 wake_up(&runtime->tsleep);
203 } else if (avail >= runtime->control->avail_min)
204 wake_up(&runtime->sleep);
205 return 0;
206}
207
208static void update_audio_tstamp(struct snd_pcm_substream *substream,
209 struct timespec64 *curr_tstamp,
210 struct timespec64 *audio_tstamp)
211{
212 struct snd_pcm_runtime *runtime = substream->runtime;
213 u64 audio_frames, audio_nsecs;
214 struct timespec64 driver_tstamp;
215
216 if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
217 return;
218
219 if (!(substream->ops->get_time_info) ||
220 (runtime->audio_tstamp_report.actual_type ==
221 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
222
223
224
225
226
227
228 audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
229
230 if (runtime->audio_tstamp_config.report_delay) {
231 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
232 audio_frames -= runtime->delay;
233 else
234 audio_frames += runtime->delay;
235 }
236 audio_nsecs = div_u64(audio_frames * 1000000000LL,
237 runtime->rate);
238 *audio_tstamp = ns_to_timespec64(audio_nsecs);
239 }
240
241 if (runtime->status->audio_tstamp.tv_sec != audio_tstamp->tv_sec ||
242 runtime->status->audio_tstamp.tv_nsec != audio_tstamp->tv_nsec) {
243 runtime->status->audio_tstamp.tv_sec = audio_tstamp->tv_sec;
244 runtime->status->audio_tstamp.tv_nsec = audio_tstamp->tv_nsec;
245 runtime->status->tstamp.tv_sec = curr_tstamp->tv_sec;
246 runtime->status->tstamp.tv_nsec = curr_tstamp->tv_nsec;
247 }
248
249
250
251
252
253
254 snd_pcm_gettime(substream->runtime, &driver_tstamp);
255 runtime->driver_tstamp = driver_tstamp;
256}
257
258static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
259 unsigned int in_interrupt)
260{
261 struct snd_pcm_runtime *runtime = substream->runtime;
262 snd_pcm_uframes_t pos;
263 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
264 snd_pcm_sframes_t hdelta, delta;
265 unsigned long jdelta;
266 unsigned long curr_jiffies;
267 struct timespec64 curr_tstamp;
268 struct timespec64 audio_tstamp;
269 int crossed_boundary = 0;
270
271 old_hw_ptr = runtime->status->hw_ptr;
272
273
274
275
276
277
278
279 pos = substream->ops->pointer(substream);
280 curr_jiffies = jiffies;
281 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
282 if ((substream->ops->get_time_info) &&
283 (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
284 substream->ops->get_time_info(substream, &curr_tstamp,
285 &audio_tstamp,
286 &runtime->audio_tstamp_config,
287 &runtime->audio_tstamp_report);
288
289
290 if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
291 snd_pcm_gettime(runtime, &curr_tstamp);
292 } else
293 snd_pcm_gettime(runtime, &curr_tstamp);
294 }
295
296 if (pos == SNDRV_PCM_POS_XRUN) {
297 __snd_pcm_xrun(substream);
298 return -EPIPE;
299 }
300 if (pos >= runtime->buffer_size) {
301 if (printk_ratelimit()) {
302 char name[16];
303 snd_pcm_debug_name(substream, name, sizeof(name));
304 pcm_err(substream->pcm,
305 "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
306 name, pos, runtime->buffer_size,
307 runtime->period_size);
308 }
309 pos = 0;
310 }
311 pos -= pos % runtime->min_align;
312 trace_hwptr(substream, pos, in_interrupt);
313 hw_base = runtime->hw_ptr_base;
314 new_hw_ptr = hw_base + pos;
315 if (in_interrupt) {
316
317
318 delta = runtime->hw_ptr_interrupt + runtime->period_size;
319 if (delta > new_hw_ptr) {
320
321 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
322 if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
323 hw_base += runtime->buffer_size;
324 if (hw_base >= runtime->boundary) {
325 hw_base = 0;
326 crossed_boundary++;
327 }
328 new_hw_ptr = hw_base + pos;
329 goto __delta;
330 }
331 }
332 }
333
334
335 if (new_hw_ptr < old_hw_ptr) {
336 hw_base += runtime->buffer_size;
337 if (hw_base >= runtime->boundary) {
338 hw_base = 0;
339 crossed_boundary++;
340 }
341 new_hw_ptr = hw_base + pos;
342 }
343 __delta:
344 delta = new_hw_ptr - old_hw_ptr;
345 if (delta < 0)
346 delta += runtime->boundary;
347
348 if (runtime->no_period_wakeup) {
349 snd_pcm_sframes_t xrun_threshold;
350
351
352
353
354 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
355 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
356 goto no_delta_check;
357 hdelta = jdelta - delta * HZ / runtime->rate;
358 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
359 while (hdelta > xrun_threshold) {
360 delta += runtime->buffer_size;
361 hw_base += runtime->buffer_size;
362 if (hw_base >= runtime->boundary) {
363 hw_base = 0;
364 crossed_boundary++;
365 }
366 new_hw_ptr = hw_base + pos;
367 hdelta -= runtime->hw_ptr_buffer_jiffies;
368 }
369 goto no_delta_check;
370 }
371
372
373 if (delta >= runtime->buffer_size + runtime->period_size) {
374 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
375 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
376 substream->stream, (long)pos,
377 (long)new_hw_ptr, (long)old_hw_ptr);
378 return 0;
379 }
380
381
382 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
383 goto no_jiffies_check;
384
385
386
387
388
389 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
390 goto no_jiffies_check;
391 hdelta = delta;
392 if (hdelta < runtime->delay)
393 goto no_jiffies_check;
394 hdelta -= runtime->delay;
395 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
396 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
397 delta = jdelta /
398 (((runtime->period_size * HZ) / runtime->rate)
399 + HZ/100);
400
401 new_hw_ptr = old_hw_ptr;
402 hw_base = delta;
403
404
405 while (delta > 0) {
406 new_hw_ptr += runtime->period_size;
407 if (new_hw_ptr >= runtime->boundary) {
408 new_hw_ptr -= runtime->boundary;
409 crossed_boundary--;
410 }
411 delta--;
412 }
413
414 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
415 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
416 (long)pos, (long)hdelta,
417 (long)runtime->period_size, jdelta,
418 ((hdelta * HZ) / runtime->rate), hw_base,
419 (unsigned long)old_hw_ptr,
420 (unsigned long)new_hw_ptr);
421
422 delta = 0;
423 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
424 }
425 no_jiffies_check:
426 if (delta > runtime->period_size + runtime->period_size / 2) {
427 hw_ptr_error(substream, in_interrupt,
428 "Lost interrupts?",
429 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
430 substream->stream, (long)delta,
431 (long)new_hw_ptr,
432 (long)old_hw_ptr);
433 }
434
435 no_delta_check:
436 if (runtime->status->hw_ptr == new_hw_ptr) {
437 runtime->hw_ptr_jiffies = curr_jiffies;
438 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
439 return 0;
440 }
441
442 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
443 runtime->silence_size > 0)
444 snd_pcm_playback_silence(substream, new_hw_ptr);
445
446 if (in_interrupt) {
447 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
448 if (delta < 0)
449 delta += runtime->boundary;
450 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
451 runtime->hw_ptr_interrupt += delta;
452 if (runtime->hw_ptr_interrupt >= runtime->boundary)
453 runtime->hw_ptr_interrupt -= runtime->boundary;
454 }
455 runtime->hw_ptr_base = hw_base;
456 runtime->status->hw_ptr = new_hw_ptr;
457 runtime->hw_ptr_jiffies = curr_jiffies;
458 if (crossed_boundary) {
459 snd_BUG_ON(crossed_boundary != 1);
460 runtime->hw_ptr_wrap += runtime->boundary;
461 }
462
463 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
464
465 return snd_pcm_update_state(substream, runtime);
466}
467
468
469int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
470{
471 return snd_pcm_update_hw_ptr0(substream, 0);
472}
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480
481
482void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
483 const struct snd_pcm_ops *ops)
484{
485 struct snd_pcm_str *stream = &pcm->streams[direction];
486 struct snd_pcm_substream *substream;
487
488 for (substream = stream->substream; substream != NULL; substream = substream->next)
489 substream->ops = ops;
490}
491EXPORT_SYMBOL(snd_pcm_set_ops);
492
493
494
495
496
497
498
499void snd_pcm_set_sync(struct snd_pcm_substream *substream)
500{
501 struct snd_pcm_runtime *runtime = substream->runtime;
502
503 runtime->sync.id32[0] = substream->pcm->card->number;
504 runtime->sync.id32[1] = -1;
505 runtime->sync.id32[2] = -1;
506 runtime->sync.id32[3] = -1;
507}
508EXPORT_SYMBOL(snd_pcm_set_sync);
509
510
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512
513
514static inline unsigned int div32(unsigned int a, unsigned int b,
515 unsigned int *r)
516{
517 if (b == 0) {
518 *r = 0;
519 return UINT_MAX;
520 }
521 *r = a % b;
522 return a / b;
523}
524
525static inline unsigned int div_down(unsigned int a, unsigned int b)
526{
527 if (b == 0)
528 return UINT_MAX;
529 return a / b;
530}
531
532static inline unsigned int div_up(unsigned int a, unsigned int b)
533{
534 unsigned int r;
535 unsigned int q;
536 if (b == 0)
537 return UINT_MAX;
538 q = div32(a, b, &r);
539 if (r)
540 ++q;
541 return q;
542}
543
544static inline unsigned int mul(unsigned int a, unsigned int b)
545{
546 if (a == 0)
547 return 0;
548 if (div_down(UINT_MAX, a) < b)
549 return UINT_MAX;
550 return a * b;
551}
552
553static inline unsigned int muldiv32(unsigned int a, unsigned int b,
554 unsigned int c, unsigned int *r)
555{
556 u_int64_t n = (u_int64_t) a * b;
557 if (c == 0) {
558 *r = 0;
559 return UINT_MAX;
560 }
561 n = div_u64_rem(n, c, r);
562 if (n >= UINT_MAX) {
563 *r = 0;
564 return UINT_MAX;
565 }
566 return n;
567}
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580
581int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
582{
583 int changed = 0;
584 if (snd_BUG_ON(snd_interval_empty(i)))
585 return -EINVAL;
586 if (i->min < v->min) {
587 i->min = v->min;
588 i->openmin = v->openmin;
589 changed = 1;
590 } else if (i->min == v->min && !i->openmin && v->openmin) {
591 i->openmin = 1;
592 changed = 1;
593 }
594 if (i->max > v->max) {
595 i->max = v->max;
596 i->openmax = v->openmax;
597 changed = 1;
598 } else if (i->max == v->max && !i->openmax && v->openmax) {
599 i->openmax = 1;
600 changed = 1;
601 }
602 if (!i->integer && v->integer) {
603 i->integer = 1;
604 changed = 1;
605 }
606 if (i->integer) {
607 if (i->openmin) {
608 i->min++;
609 i->openmin = 0;
610 }
611 if (i->openmax) {
612 i->max--;
613 i->openmax = 0;
614 }
615 } else if (!i->openmin && !i->openmax && i->min == i->max)
616 i->integer = 1;
617 if (snd_interval_checkempty(i)) {
618 snd_interval_none(i);
619 return -EINVAL;
620 }
621 return changed;
622}
623EXPORT_SYMBOL(snd_interval_refine);
624
625static int snd_interval_refine_first(struct snd_interval *i)
626{
627 const unsigned int last_max = i->max;
628
629 if (snd_BUG_ON(snd_interval_empty(i)))
630 return -EINVAL;
631 if (snd_interval_single(i))
632 return 0;
633 i->max = i->min;
634 if (i->openmin)
635 i->max++;
636
637 i->openmax = (i->openmax && i->max >= last_max);
638 return 1;
639}
640
641static int snd_interval_refine_last(struct snd_interval *i)
642{
643 const unsigned int last_min = i->min;
644
645 if (snd_BUG_ON(snd_interval_empty(i)))
646 return -EINVAL;
647 if (snd_interval_single(i))
648 return 0;
649 i->min = i->max;
650 if (i->openmax)
651 i->min--;
652
653 i->openmin = (i->openmin && i->min <= last_min);
654 return 1;
655}
656
657void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
658{
659 if (a->empty || b->empty) {
660 snd_interval_none(c);
661 return;
662 }
663 c->empty = 0;
664 c->min = mul(a->min, b->min);
665 c->openmin = (a->openmin || b->openmin);
666 c->max = mul(a->max, b->max);
667 c->openmax = (a->openmax || b->openmax);
668 c->integer = (a->integer && b->integer);
669}
670
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680
681void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
682{
683 unsigned int r;
684 if (a->empty || b->empty) {
685 snd_interval_none(c);
686 return;
687 }
688 c->empty = 0;
689 c->min = div32(a->min, b->max, &r);
690 c->openmin = (r || a->openmin || b->openmax);
691 if (b->min > 0) {
692 c->max = div32(a->max, b->min, &r);
693 if (r) {
694 c->max++;
695 c->openmax = 1;
696 } else
697 c->openmax = (a->openmax || b->openmin);
698 } else {
699 c->max = UINT_MAX;
700 c->openmax = 0;
701 }
702 c->integer = 0;
703}
704
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715
716void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
717 unsigned int k, struct snd_interval *c)
718{
719 unsigned int r;
720 if (a->empty || b->empty) {
721 snd_interval_none(c);
722 return;
723 }
724 c->empty = 0;
725 c->min = muldiv32(a->min, b->min, k, &r);
726 c->openmin = (r || a->openmin || b->openmin);
727 c->max = muldiv32(a->max, b->max, k, &r);
728 if (r) {
729 c->max++;
730 c->openmax = 1;
731 } else
732 c->openmax = (a->openmax || b->openmax);
733 c->integer = 0;
734}
735
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745
746
747void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
748 const struct snd_interval *b, struct snd_interval *c)
749{
750 unsigned int r;
751 if (a->empty || b->empty) {
752 snd_interval_none(c);
753 return;
754 }
755 c->empty = 0;
756 c->min = muldiv32(a->min, k, b->max, &r);
757 c->openmin = (r || a->openmin || b->openmax);
758 if (b->min > 0) {
759 c->max = muldiv32(a->max, k, b->min, &r);
760 if (r) {
761 c->max++;
762 c->openmax = 1;
763 } else
764 c->openmax = (a->openmax || b->openmin);
765 } else {
766 c->max = UINT_MAX;
767 c->openmax = 0;
768 }
769 c->integer = 0;
770}
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786int snd_interval_ratnum(struct snd_interval *i,
787 unsigned int rats_count, const struct snd_ratnum *rats,
788 unsigned int *nump, unsigned int *denp)
789{
790 unsigned int best_num, best_den;
791 int best_diff;
792 unsigned int k;
793 struct snd_interval t;
794 int err;
795 unsigned int result_num, result_den;
796 int result_diff;
797
798 best_num = best_den = best_diff = 0;
799 for (k = 0; k < rats_count; ++k) {
800 unsigned int num = rats[k].num;
801 unsigned int den;
802 unsigned int q = i->min;
803 int diff;
804 if (q == 0)
805 q = 1;
806 den = div_up(num, q);
807 if (den < rats[k].den_min)
808 continue;
809 if (den > rats[k].den_max)
810 den = rats[k].den_max;
811 else {
812 unsigned int r;
813 r = (den - rats[k].den_min) % rats[k].den_step;
814 if (r != 0)
815 den -= r;
816 }
817 diff = num - q * den;
818 if (diff < 0)
819 diff = -diff;
820 if (best_num == 0 ||
821 diff * best_den < best_diff * den) {
822 best_diff = diff;
823 best_den = den;
824 best_num = num;
825 }
826 }
827 if (best_den == 0) {
828 i->empty = 1;
829 return -EINVAL;
830 }
831 t.min = div_down(best_num, best_den);
832 t.openmin = !!(best_num % best_den);
833
834 result_num = best_num;
835 result_diff = best_diff;
836 result_den = best_den;
837 best_num = best_den = best_diff = 0;
838 for (k = 0; k < rats_count; ++k) {
839 unsigned int num = rats[k].num;
840 unsigned int den;
841 unsigned int q = i->max;
842 int diff;
843 if (q == 0) {
844 i->empty = 1;
845 return -EINVAL;
846 }
847 den = div_down(num, q);
848 if (den > rats[k].den_max)
849 continue;
850 if (den < rats[k].den_min)
851 den = rats[k].den_min;
852 else {
853 unsigned int r;
854 r = (den - rats[k].den_min) % rats[k].den_step;
855 if (r != 0)
856 den += rats[k].den_step - r;
857 }
858 diff = q * den - num;
859 if (diff < 0)
860 diff = -diff;
861 if (best_num == 0 ||
862 diff * best_den < best_diff * den) {
863 best_diff = diff;
864 best_den = den;
865 best_num = num;
866 }
867 }
868 if (best_den == 0) {
869 i->empty = 1;
870 return -EINVAL;
871 }
872 t.max = div_up(best_num, best_den);
873 t.openmax = !!(best_num % best_den);
874 t.integer = 0;
875 err = snd_interval_refine(i, &t);
876 if (err < 0)
877 return err;
878
879 if (snd_interval_single(i)) {
880 if (best_diff * result_den < result_diff * best_den) {
881 result_num = best_num;
882 result_den = best_den;
883 }
884 if (nump)
885 *nump = result_num;
886 if (denp)
887 *denp = result_den;
888 }
889 return err;
890}
891EXPORT_SYMBOL(snd_interval_ratnum);
892
893
894
895
896
897
898
899
900
901
902
903
904static int snd_interval_ratden(struct snd_interval *i,
905 unsigned int rats_count,
906 const struct snd_ratden *rats,
907 unsigned int *nump, unsigned int *denp)
908{
909 unsigned int best_num, best_diff, best_den;
910 unsigned int k;
911 struct snd_interval t;
912 int err;
913
914 best_num = best_den = best_diff = 0;
915 for (k = 0; k < rats_count; ++k) {
916 unsigned int num;
917 unsigned int den = rats[k].den;
918 unsigned int q = i->min;
919 int diff;
920 num = mul(q, den);
921 if (num > rats[k].num_max)
922 continue;
923 if (num < rats[k].num_min)
924 num = rats[k].num_max;
925 else {
926 unsigned int r;
927 r = (num - rats[k].num_min) % rats[k].num_step;
928 if (r != 0)
929 num += rats[k].num_step - r;
930 }
931 diff = num - q * den;
932 if (best_num == 0 ||
933 diff * best_den < best_diff * den) {
934 best_diff = diff;
935 best_den = den;
936 best_num = num;
937 }
938 }
939 if (best_den == 0) {
940 i->empty = 1;
941 return -EINVAL;
942 }
943 t.min = div_down(best_num, best_den);
944 t.openmin = !!(best_num % best_den);
945
946 best_num = best_den = best_diff = 0;
947 for (k = 0; k < rats_count; ++k) {
948 unsigned int num;
949 unsigned int den = rats[k].den;
950 unsigned int q = i->max;
951 int diff;
952 num = mul(q, den);
953 if (num < rats[k].num_min)
954 continue;
955 if (num > rats[k].num_max)
956 num = rats[k].num_max;
957 else {
958 unsigned int r;
959 r = (num - rats[k].num_min) % rats[k].num_step;
960 if (r != 0)
961 num -= r;
962 }
963 diff = q * den - num;
964 if (best_num == 0 ||
965 diff * best_den < best_diff * den) {
966 best_diff = diff;
967 best_den = den;
968 best_num = num;
969 }
970 }
971 if (best_den == 0) {
972 i->empty = 1;
973 return -EINVAL;
974 }
975 t.max = div_up(best_num, best_den);
976 t.openmax = !!(best_num % best_den);
977 t.integer = 0;
978 err = snd_interval_refine(i, &t);
979 if (err < 0)
980 return err;
981
982 if (snd_interval_single(i)) {
983 if (nump)
984 *nump = best_num;
985 if (denp)
986 *denp = best_den;
987 }
988 return err;
989}
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005int snd_interval_list(struct snd_interval *i, unsigned int count,
1006 const unsigned int *list, unsigned int mask)
1007{
1008 unsigned int k;
1009 struct snd_interval list_range;
1010
1011 if (!count) {
1012 i->empty = 1;
1013 return -EINVAL;
1014 }
1015 snd_interval_any(&list_range);
1016 list_range.min = UINT_MAX;
1017 list_range.max = 0;
1018 for (k = 0; k < count; k++) {
1019 if (mask && !(mask & (1 << k)))
1020 continue;
1021 if (!snd_interval_test(i, list[k]))
1022 continue;
1023 list_range.min = min(list_range.min, list[k]);
1024 list_range.max = max(list_range.max, list[k]);
1025 }
1026 return snd_interval_refine(i, &list_range);
1027}
1028EXPORT_SYMBOL(snd_interval_list);
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1045 const struct snd_interval *ranges, unsigned int mask)
1046{
1047 unsigned int k;
1048 struct snd_interval range_union;
1049 struct snd_interval range;
1050
1051 if (!count) {
1052 snd_interval_none(i);
1053 return -EINVAL;
1054 }
1055 snd_interval_any(&range_union);
1056 range_union.min = UINT_MAX;
1057 range_union.max = 0;
1058 for (k = 0; k < count; k++) {
1059 if (mask && !(mask & (1 << k)))
1060 continue;
1061 snd_interval_copy(&range, &ranges[k]);
1062 if (snd_interval_refine(&range, i) < 0)
1063 continue;
1064 if (snd_interval_empty(&range))
1065 continue;
1066
1067 if (range.min < range_union.min) {
1068 range_union.min = range.min;
1069 range_union.openmin = 1;
1070 }
1071 if (range.min == range_union.min && !range.openmin)
1072 range_union.openmin = 0;
1073 if (range.max > range_union.max) {
1074 range_union.max = range.max;
1075 range_union.openmax = 1;
1076 }
1077 if (range.max == range_union.max && !range.openmax)
1078 range_union.openmax = 0;
1079 }
1080 return snd_interval_refine(i, &range_union);
1081}
1082EXPORT_SYMBOL(snd_interval_ranges);
1083
1084static int snd_interval_step(struct snd_interval *i, unsigned int step)
1085{
1086 unsigned int n;
1087 int changed = 0;
1088 n = i->min % step;
1089 if (n != 0 || i->openmin) {
1090 i->min += step - n;
1091 i->openmin = 0;
1092 changed = 1;
1093 }
1094 n = i->max % step;
1095 if (n != 0 || i->openmax) {
1096 i->max -= n;
1097 i->openmax = 0;
1098 changed = 1;
1099 }
1100 if (snd_interval_checkempty(i)) {
1101 i->empty = 1;
1102 return -EINVAL;
1103 }
1104 return changed;
1105}
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1121 int var,
1122 snd_pcm_hw_rule_func_t func, void *private,
1123 int dep, ...)
1124{
1125 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1126 struct snd_pcm_hw_rule *c;
1127 unsigned int k;
1128 va_list args;
1129 va_start(args, dep);
1130 if (constrs->rules_num >= constrs->rules_all) {
1131 struct snd_pcm_hw_rule *new;
1132 unsigned int new_rules = constrs->rules_all + 16;
1133 new = krealloc_array(constrs->rules, new_rules,
1134 sizeof(*c), GFP_KERNEL);
1135 if (!new) {
1136 va_end(args);
1137 return -ENOMEM;
1138 }
1139 constrs->rules = new;
1140 constrs->rules_all = new_rules;
1141 }
1142 c = &constrs->rules[constrs->rules_num];
1143 c->cond = cond;
1144 c->func = func;
1145 c->var = var;
1146 c->private = private;
1147 k = 0;
1148 while (1) {
1149 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1150 va_end(args);
1151 return -EINVAL;
1152 }
1153 c->deps[k++] = dep;
1154 if (dep < 0)
1155 break;
1156 dep = va_arg(args, int);
1157 }
1158 constrs->rules_num++;
1159 va_end(args);
1160 return 0;
1161}
1162EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1175 u_int32_t mask)
1176{
1177 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1178 struct snd_mask *maskp = constrs_mask(constrs, var);
1179 *maskp->bits &= mask;
1180 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8);
1181 if (*maskp->bits == 0)
1182 return -EINVAL;
1183 return 0;
1184}
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1197 u_int64_t mask)
1198{
1199 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1200 struct snd_mask *maskp = constrs_mask(constrs, var);
1201 maskp->bits[0] &= (u_int32_t)mask;
1202 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1203 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8);
1204 if (! maskp->bits[0] && ! maskp->bits[1])
1205 return -EINVAL;
1206 return 0;
1207}
1208EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1221{
1222 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1223 return snd_interval_setinteger(constrs_interval(constrs, var));
1224}
1225EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1240 unsigned int min, unsigned int max)
1241{
1242 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1243 struct snd_interval t;
1244 t.min = min;
1245 t.max = max;
1246 t.openmin = t.openmax = 0;
1247 t.integer = 0;
1248 return snd_interval_refine(constrs_interval(constrs, var), &t);
1249}
1250EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1251
1252static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1253 struct snd_pcm_hw_rule *rule)
1254{
1255 struct snd_pcm_hw_constraint_list *list = rule->private;
1256 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1257}
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1272 unsigned int cond,
1273 snd_pcm_hw_param_t var,
1274 const struct snd_pcm_hw_constraint_list *l)
1275{
1276 return snd_pcm_hw_rule_add(runtime, cond, var,
1277 snd_pcm_hw_rule_list, (void *)l,
1278 var, -1);
1279}
1280EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1281
1282static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
1283 struct snd_pcm_hw_rule *rule)
1284{
1285 struct snd_pcm_hw_constraint_ranges *r = rule->private;
1286 return snd_interval_ranges(hw_param_interval(params, rule->var),
1287 r->count, r->ranges, r->mask);
1288}
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1303 unsigned int cond,
1304 snd_pcm_hw_param_t var,
1305 const struct snd_pcm_hw_constraint_ranges *r)
1306{
1307 return snd_pcm_hw_rule_add(runtime, cond, var,
1308 snd_pcm_hw_rule_ranges, (void *)r,
1309 var, -1);
1310}
1311EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
1312
1313static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1314 struct snd_pcm_hw_rule *rule)
1315{
1316 const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1317 unsigned int num = 0, den = 0;
1318 int err;
1319 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1320 r->nrats, r->rats, &num, &den);
1321 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1322 params->rate_num = num;
1323 params->rate_den = den;
1324 }
1325 return err;
1326}
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1338 unsigned int cond,
1339 snd_pcm_hw_param_t var,
1340 const struct snd_pcm_hw_constraint_ratnums *r)
1341{
1342 return snd_pcm_hw_rule_add(runtime, cond, var,
1343 snd_pcm_hw_rule_ratnums, (void *)r,
1344 var, -1);
1345}
1346EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1347
1348static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1349 struct snd_pcm_hw_rule *rule)
1350{
1351 const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1352 unsigned int num = 0, den = 0;
1353 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1354 r->nrats, r->rats, &num, &den);
1355 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1356 params->rate_num = num;
1357 params->rate_den = den;
1358 }
1359 return err;
1360}
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1372 unsigned int cond,
1373 snd_pcm_hw_param_t var,
1374 const struct snd_pcm_hw_constraint_ratdens *r)
1375{
1376 return snd_pcm_hw_rule_add(runtime, cond, var,
1377 snd_pcm_hw_rule_ratdens, (void *)r,
1378 var, -1);
1379}
1380EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1381
1382static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1383 struct snd_pcm_hw_rule *rule)
1384{
1385 unsigned int l = (unsigned long) rule->private;
1386 int width = l & 0xffff;
1387 unsigned int msbits = l >> 16;
1388 const struct snd_interval *i =
1389 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1390
1391 if (!snd_interval_single(i))
1392 return 0;
1393
1394 if ((snd_interval_value(i) == width) ||
1395 (width == 0 && snd_interval_value(i) > msbits))
1396 params->msbits = min_not_zero(params->msbits, msbits);
1397
1398 return 0;
1399}
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1416 unsigned int cond,
1417 unsigned int width,
1418 unsigned int msbits)
1419{
1420 unsigned long l = (msbits << 16) | width;
1421 return snd_pcm_hw_rule_add(runtime, cond, -1,
1422 snd_pcm_hw_rule_msbits,
1423 (void*) l,
1424 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1425}
1426EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1427
1428static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1429 struct snd_pcm_hw_rule *rule)
1430{
1431 unsigned long step = (unsigned long) rule->private;
1432 return snd_interval_step(hw_param_interval(params, rule->var), step);
1433}
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1445 unsigned int cond,
1446 snd_pcm_hw_param_t var,
1447 unsigned long step)
1448{
1449 return snd_pcm_hw_rule_add(runtime, cond, var,
1450 snd_pcm_hw_rule_step, (void *) step,
1451 var, -1);
1452}
1453EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1454
1455static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1456{
1457 static const unsigned int pow2_sizes[] = {
1458 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1459 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1460 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1461 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1462 };
1463 return snd_interval_list(hw_param_interval(params, rule->var),
1464 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1465}
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1476 unsigned int cond,
1477 snd_pcm_hw_param_t var)
1478{
1479 return snd_pcm_hw_rule_add(runtime, cond, var,
1480 snd_pcm_hw_rule_pow2, NULL,
1481 var, -1);
1482}
1483EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1484
1485static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1486 struct snd_pcm_hw_rule *rule)
1487{
1488 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1489 struct snd_interval *rate;
1490
1491 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1492 return snd_interval_list(rate, 1, &base_rate, 0);
1493}
1494
1495
1496
1497
1498
1499
1500
1501
1502int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1503 unsigned int base_rate)
1504{
1505 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1506 SNDRV_PCM_HW_PARAM_RATE,
1507 snd_pcm_hw_rule_noresample_func,
1508 (void *)(uintptr_t)base_rate,
1509 SNDRV_PCM_HW_PARAM_RATE, -1);
1510}
1511EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1512
1513static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1514 snd_pcm_hw_param_t var)
1515{
1516 if (hw_is_mask(var)) {
1517 snd_mask_any(hw_param_mask(params, var));
1518 params->cmask |= 1 << var;
1519 params->rmask |= 1 << var;
1520 return;
1521 }
1522 if (hw_is_interval(var)) {
1523 snd_interval_any(hw_param_interval(params, var));
1524 params->cmask |= 1 << var;
1525 params->rmask |= 1 << var;
1526 return;
1527 }
1528 snd_BUG();
1529}
1530
1531void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1532{
1533 unsigned int k;
1534 memset(params, 0, sizeof(*params));
1535 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1536 _snd_pcm_hw_param_any(params, k);
1537 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1538 _snd_pcm_hw_param_any(params, k);
1539 params->info = ~0U;
1540}
1541EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1553 snd_pcm_hw_param_t var, int *dir)
1554{
1555 if (hw_is_mask(var)) {
1556 const struct snd_mask *mask = hw_param_mask_c(params, var);
1557 if (!snd_mask_single(mask))
1558 return -EINVAL;
1559 if (dir)
1560 *dir = 0;
1561 return snd_mask_value(mask);
1562 }
1563 if (hw_is_interval(var)) {
1564 const struct snd_interval *i = hw_param_interval_c(params, var);
1565 if (!snd_interval_single(i))
1566 return -EINVAL;
1567 if (dir)
1568 *dir = i->openmin;
1569 return snd_interval_value(i);
1570 }
1571 return -EINVAL;
1572}
1573EXPORT_SYMBOL(snd_pcm_hw_param_value);
1574
1575void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1576 snd_pcm_hw_param_t var)
1577{
1578 if (hw_is_mask(var)) {
1579 snd_mask_none(hw_param_mask(params, var));
1580 params->cmask |= 1 << var;
1581 params->rmask |= 1 << var;
1582 } else if (hw_is_interval(var)) {
1583 snd_interval_none(hw_param_interval(params, var));
1584 params->cmask |= 1 << var;
1585 params->rmask |= 1 << var;
1586 } else {
1587 snd_BUG();
1588 }
1589}
1590EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1591
1592static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1593 snd_pcm_hw_param_t var)
1594{
1595 int changed;
1596 if (hw_is_mask(var))
1597 changed = snd_mask_refine_first(hw_param_mask(params, var));
1598 else if (hw_is_interval(var))
1599 changed = snd_interval_refine_first(hw_param_interval(params, var));
1600 else
1601 return -EINVAL;
1602 if (changed > 0) {
1603 params->cmask |= 1 << var;
1604 params->rmask |= 1 << var;
1605 }
1606 return changed;
1607}
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1623 struct snd_pcm_hw_params *params,
1624 snd_pcm_hw_param_t var, int *dir)
1625{
1626 int changed = _snd_pcm_hw_param_first(params, var);
1627 if (changed < 0)
1628 return changed;
1629 if (params->rmask) {
1630 int err = snd_pcm_hw_refine(pcm, params);
1631 if (err < 0)
1632 return err;
1633 }
1634 return snd_pcm_hw_param_value(params, var, dir);
1635}
1636EXPORT_SYMBOL(snd_pcm_hw_param_first);
1637
1638static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1639 snd_pcm_hw_param_t var)
1640{
1641 int changed;
1642 if (hw_is_mask(var))
1643 changed = snd_mask_refine_last(hw_param_mask(params, var));
1644 else if (hw_is_interval(var))
1645 changed = snd_interval_refine_last(hw_param_interval(params, var));
1646 else
1647 return -EINVAL;
1648 if (changed > 0) {
1649 params->cmask |= 1 << var;
1650 params->rmask |= 1 << var;
1651 }
1652 return changed;
1653}
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1669 struct snd_pcm_hw_params *params,
1670 snd_pcm_hw_param_t var, int *dir)
1671{
1672 int changed = _snd_pcm_hw_param_last(params, var);
1673 if (changed < 0)
1674 return changed;
1675 if (params->rmask) {
1676 int err = snd_pcm_hw_refine(pcm, params);
1677 if (err < 0)
1678 return err;
1679 }
1680 return snd_pcm_hw_param_value(params, var, dir);
1681}
1682EXPORT_SYMBOL(snd_pcm_hw_param_last);
1683
1684static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1685 void *arg)
1686{
1687 struct snd_pcm_runtime *runtime = substream->runtime;
1688 unsigned long flags;
1689 snd_pcm_stream_lock_irqsave(substream, flags);
1690 if (snd_pcm_running(substream) &&
1691 snd_pcm_update_hw_ptr(substream) >= 0)
1692 runtime->status->hw_ptr %= runtime->buffer_size;
1693 else {
1694 runtime->status->hw_ptr = 0;
1695 runtime->hw_ptr_wrap = 0;
1696 }
1697 snd_pcm_stream_unlock_irqrestore(substream, flags);
1698 return 0;
1699}
1700
1701static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1702 void *arg)
1703{
1704 struct snd_pcm_channel_info *info = arg;
1705 struct snd_pcm_runtime *runtime = substream->runtime;
1706 int width;
1707 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1708 info->offset = -1;
1709 return 0;
1710 }
1711 width = snd_pcm_format_physical_width(runtime->format);
1712 if (width < 0)
1713 return width;
1714 info->offset = 0;
1715 switch (runtime->access) {
1716 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1717 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1718 info->first = info->channel * width;
1719 info->step = runtime->channels * width;
1720 break;
1721 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1722 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1723 {
1724 size_t size = runtime->dma_bytes / runtime->channels;
1725 info->first = info->channel * size * 8;
1726 info->step = width;
1727 break;
1728 }
1729 default:
1730 snd_BUG();
1731 break;
1732 }
1733 return 0;
1734}
1735
1736static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1737 void *arg)
1738{
1739 struct snd_pcm_hw_params *params = arg;
1740 snd_pcm_format_t format;
1741 int channels;
1742 ssize_t frame_size;
1743
1744 params->fifo_size = substream->runtime->hw.fifo_size;
1745 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1746 format = params_format(params);
1747 channels = params_channels(params);
1748 frame_size = snd_pcm_format_size(format, channels);
1749 if (frame_size > 0)
1750 params->fifo_size /= frame_size;
1751 }
1752 return 0;
1753}
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1767 unsigned int cmd, void *arg)
1768{
1769 switch (cmd) {
1770 case SNDRV_PCM_IOCTL1_RESET:
1771 return snd_pcm_lib_ioctl_reset(substream, arg);
1772 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1773 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1774 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1775 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1776 }
1777 return -ENXIO;
1778}
1779EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream)
1809{
1810 struct snd_pcm_runtime *runtime;
1811
1812 if (PCM_RUNTIME_CHECK(substream))
1813 return;
1814 runtime = substream->runtime;
1815
1816 if (!snd_pcm_running(substream) ||
1817 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1818 goto _end;
1819
1820#ifdef CONFIG_SND_PCM_TIMER
1821 if (substream->timer_running)
1822 snd_timer_interrupt(substream->timer, 1);
1823#endif
1824 _end:
1825 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1826}
1827EXPORT_SYMBOL(snd_pcm_period_elapsed_under_stream_lock);
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1842{
1843 unsigned long flags;
1844
1845 if (snd_BUG_ON(!substream))
1846 return;
1847
1848 snd_pcm_stream_lock_irqsave(substream, flags);
1849 snd_pcm_period_elapsed_under_stream_lock(substream);
1850 snd_pcm_stream_unlock_irqrestore(substream, flags);
1851}
1852EXPORT_SYMBOL(snd_pcm_period_elapsed);
1853
1854
1855
1856
1857
1858
1859
1860static int wait_for_avail(struct snd_pcm_substream *substream,
1861 snd_pcm_uframes_t *availp)
1862{
1863 struct snd_pcm_runtime *runtime = substream->runtime;
1864 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1865 wait_queue_entry_t wait;
1866 int err = 0;
1867 snd_pcm_uframes_t avail = 0;
1868 long wait_time, tout;
1869
1870 init_waitqueue_entry(&wait, current);
1871 set_current_state(TASK_INTERRUPTIBLE);
1872 add_wait_queue(&runtime->tsleep, &wait);
1873
1874 if (runtime->no_period_wakeup)
1875 wait_time = MAX_SCHEDULE_TIMEOUT;
1876 else {
1877
1878 if (substream->wait_time) {
1879 wait_time = substream->wait_time;
1880 } else {
1881 wait_time = 10;
1882
1883 if (runtime->rate) {
1884 long t = runtime->period_size * 2 /
1885 runtime->rate;
1886 wait_time = max(t, wait_time);
1887 }
1888 wait_time = msecs_to_jiffies(wait_time * 1000);
1889 }
1890 }
1891
1892 for (;;) {
1893 if (signal_pending(current)) {
1894 err = -ERESTARTSYS;
1895 break;
1896 }
1897
1898
1899
1900
1901
1902
1903
1904
1905 avail = snd_pcm_avail(substream);
1906 if (avail >= runtime->twake)
1907 break;
1908 snd_pcm_stream_unlock_irq(substream);
1909
1910 tout = schedule_timeout(wait_time);
1911
1912 snd_pcm_stream_lock_irq(substream);
1913 set_current_state(TASK_INTERRUPTIBLE);
1914 switch (runtime->status->state) {
1915 case SNDRV_PCM_STATE_SUSPENDED:
1916 err = -ESTRPIPE;
1917 goto _endloop;
1918 case SNDRV_PCM_STATE_XRUN:
1919 err = -EPIPE;
1920 goto _endloop;
1921 case SNDRV_PCM_STATE_DRAINING:
1922 if (is_playback)
1923 err = -EPIPE;
1924 else
1925 avail = 0;
1926 goto _endloop;
1927 case SNDRV_PCM_STATE_OPEN:
1928 case SNDRV_PCM_STATE_SETUP:
1929 case SNDRV_PCM_STATE_DISCONNECTED:
1930 err = -EBADFD;
1931 goto _endloop;
1932 case SNDRV_PCM_STATE_PAUSED:
1933 continue;
1934 }
1935 if (!tout) {
1936 pcm_dbg(substream->pcm,
1937 "%s write error (DMA or IRQ trouble?)\n",
1938 is_playback ? "playback" : "capture");
1939 err = -EIO;
1940 break;
1941 }
1942 }
1943 _endloop:
1944 set_current_state(TASK_RUNNING);
1945 remove_wait_queue(&runtime->tsleep, &wait);
1946 *availp = avail;
1947 return err;
1948}
1949
1950typedef int (*pcm_transfer_f)(struct snd_pcm_substream *substream,
1951 int channel, unsigned long hwoff,
1952 void *buf, unsigned long bytes);
1953
1954typedef int (*pcm_copy_f)(struct snd_pcm_substream *, snd_pcm_uframes_t, void *,
1955 snd_pcm_uframes_t, snd_pcm_uframes_t, pcm_transfer_f);
1956
1957
1958static void *get_dma_ptr(struct snd_pcm_runtime *runtime,
1959 int channel, unsigned long hwoff)
1960{
1961 return runtime->dma_area + hwoff +
1962 channel * (runtime->dma_bytes / runtime->channels);
1963}
1964
1965
1966static int default_write_copy(struct snd_pcm_substream *substream,
1967 int channel, unsigned long hwoff,
1968 void *buf, unsigned long bytes)
1969{
1970 if (copy_from_user(get_dma_ptr(substream->runtime, channel, hwoff),
1971 (void __user *)buf, bytes))
1972 return -EFAULT;
1973 return 0;
1974}
1975
1976
1977static int default_write_copy_kernel(struct snd_pcm_substream *substream,
1978 int channel, unsigned long hwoff,
1979 void *buf, unsigned long bytes)
1980{
1981 memcpy(get_dma_ptr(substream->runtime, channel, hwoff), buf, bytes);
1982 return 0;
1983}
1984
1985
1986
1987
1988
1989static int fill_silence(struct snd_pcm_substream *substream, int channel,
1990 unsigned long hwoff, void *buf, unsigned long bytes)
1991{
1992 struct snd_pcm_runtime *runtime = substream->runtime;
1993
1994 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
1995 return 0;
1996 if (substream->ops->fill_silence)
1997 return substream->ops->fill_silence(substream, channel,
1998 hwoff, bytes);
1999
2000 snd_pcm_format_set_silence(runtime->format,
2001 get_dma_ptr(runtime, channel, hwoff),
2002 bytes_to_samples(runtime, bytes));
2003 return 0;
2004}
2005
2006
2007static int default_read_copy(struct snd_pcm_substream *substream,
2008 int channel, unsigned long hwoff,
2009 void *buf, unsigned long bytes)
2010{
2011 if (copy_to_user((void __user *)buf,
2012 get_dma_ptr(substream->runtime, channel, hwoff),
2013 bytes))
2014 return -EFAULT;
2015 return 0;
2016}
2017
2018
2019static int default_read_copy_kernel(struct snd_pcm_substream *substream,
2020 int channel, unsigned long hwoff,
2021 void *buf, unsigned long bytes)
2022{
2023 memcpy(buf, get_dma_ptr(substream->runtime, channel, hwoff), bytes);
2024 return 0;
2025}
2026
2027
2028
2029
2030static int interleaved_copy(struct snd_pcm_substream *substream,
2031 snd_pcm_uframes_t hwoff, void *data,
2032 snd_pcm_uframes_t off,
2033 snd_pcm_uframes_t frames,
2034 pcm_transfer_f transfer)
2035{
2036 struct snd_pcm_runtime *runtime = substream->runtime;
2037
2038
2039 hwoff = frames_to_bytes(runtime, hwoff);
2040 off = frames_to_bytes(runtime, off);
2041 frames = frames_to_bytes(runtime, frames);
2042 return transfer(substream, 0, hwoff, data + off, frames);
2043}
2044
2045
2046
2047
2048static int noninterleaved_copy(struct snd_pcm_substream *substream,
2049 snd_pcm_uframes_t hwoff, void *data,
2050 snd_pcm_uframes_t off,
2051 snd_pcm_uframes_t frames,
2052 pcm_transfer_f transfer)
2053{
2054 struct snd_pcm_runtime *runtime = substream->runtime;
2055 int channels = runtime->channels;
2056 void **bufs = data;
2057 int c, err;
2058
2059
2060
2061
2062
2063 off = samples_to_bytes(runtime, off);
2064 frames = samples_to_bytes(runtime, frames);
2065 hwoff = samples_to_bytes(runtime, hwoff);
2066 for (c = 0; c < channels; ++c, ++bufs) {
2067 if (!data || !*bufs)
2068 err = fill_silence(substream, c, hwoff, NULL, frames);
2069 else
2070 err = transfer(substream, c, hwoff, *bufs + off,
2071 frames);
2072 if (err < 0)
2073 return err;
2074 }
2075 return 0;
2076}
2077
2078
2079
2080
2081static int fill_silence_frames(struct snd_pcm_substream *substream,
2082 snd_pcm_uframes_t off, snd_pcm_uframes_t frames)
2083{
2084 if (substream->runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
2085 substream->runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)
2086 return interleaved_copy(substream, off, NULL, 0, frames,
2087 fill_silence);
2088 else
2089 return noninterleaved_copy(substream, off, NULL, 0, frames,
2090 fill_silence);
2091}
2092
2093
2094static int pcm_sanity_check(struct snd_pcm_substream *substream)
2095{
2096 struct snd_pcm_runtime *runtime;
2097 if (PCM_RUNTIME_CHECK(substream))
2098 return -ENXIO;
2099 runtime = substream->runtime;
2100 if (snd_BUG_ON(!substream->ops->copy_user && !runtime->dma_area))
2101 return -EINVAL;
2102 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2103 return -EBADFD;
2104 return 0;
2105}
2106
2107static int pcm_accessible_state(struct snd_pcm_runtime *runtime)
2108{
2109 switch (runtime->status->state) {
2110 case SNDRV_PCM_STATE_PREPARED:
2111 case SNDRV_PCM_STATE_RUNNING:
2112 case SNDRV_PCM_STATE_PAUSED:
2113 return 0;
2114 case SNDRV_PCM_STATE_XRUN:
2115 return -EPIPE;
2116 case SNDRV_PCM_STATE_SUSPENDED:
2117 return -ESTRPIPE;
2118 default:
2119 return -EBADFD;
2120 }
2121}
2122
2123
2124
2125
2126int pcm_lib_apply_appl_ptr(struct snd_pcm_substream *substream,
2127 snd_pcm_uframes_t appl_ptr)
2128{
2129 struct snd_pcm_runtime *runtime = substream->runtime;
2130 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
2131 int ret;
2132
2133 if (old_appl_ptr == appl_ptr)
2134 return 0;
2135
2136 runtime->control->appl_ptr = appl_ptr;
2137 if (substream->ops->ack) {
2138 ret = substream->ops->ack(substream);
2139 if (ret < 0) {
2140 runtime->control->appl_ptr = old_appl_ptr;
2141 return ret;
2142 }
2143 }
2144
2145 trace_applptr(substream, old_appl_ptr, appl_ptr);
2146
2147 return 0;
2148}
2149
2150
2151snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
2152 void *data, bool interleaved,
2153 snd_pcm_uframes_t size, bool in_kernel)
2154{
2155 struct snd_pcm_runtime *runtime = substream->runtime;
2156 snd_pcm_uframes_t xfer = 0;
2157 snd_pcm_uframes_t offset = 0;
2158 snd_pcm_uframes_t avail;
2159 pcm_copy_f writer;
2160 pcm_transfer_f transfer;
2161 bool nonblock;
2162 bool is_playback;
2163 int err;
2164
2165 err = pcm_sanity_check(substream);
2166 if (err < 0)
2167 return err;
2168
2169 is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
2170 if (interleaved) {
2171 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2172 runtime->channels > 1)
2173 return -EINVAL;
2174 writer = interleaved_copy;
2175 } else {
2176 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2177 return -EINVAL;
2178 writer = noninterleaved_copy;
2179 }
2180
2181 if (!data) {
2182 if (is_playback)
2183 transfer = fill_silence;
2184 else
2185 return -EINVAL;
2186 } else if (in_kernel) {
2187 if (substream->ops->copy_kernel)
2188 transfer = substream->ops->copy_kernel;
2189 else
2190 transfer = is_playback ?
2191 default_write_copy_kernel : default_read_copy_kernel;
2192 } else {
2193 if (substream->ops->copy_user)
2194 transfer = (pcm_transfer_f)substream->ops->copy_user;
2195 else
2196 transfer = is_playback ?
2197 default_write_copy : default_read_copy;
2198 }
2199
2200 if (size == 0)
2201 return 0;
2202
2203 nonblock = !!(substream->f_flags & O_NONBLOCK);
2204
2205 snd_pcm_stream_lock_irq(substream);
2206 err = pcm_accessible_state(runtime);
2207 if (err < 0)
2208 goto _end_unlock;
2209
2210 runtime->twake = runtime->control->avail_min ? : 1;
2211 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2212 snd_pcm_update_hw_ptr(substream);
2213
2214
2215
2216
2217
2218 if (!is_playback &&
2219 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2220 size >= runtime->start_threshold) {
2221 err = snd_pcm_start(substream);
2222 if (err < 0)
2223 goto _end_unlock;
2224 }
2225
2226 avail = snd_pcm_avail(substream);
2227
2228 while (size > 0) {
2229 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2230 snd_pcm_uframes_t cont;
2231 if (!avail) {
2232 if (!is_playback &&
2233 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2234 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2235 goto _end_unlock;
2236 }
2237 if (nonblock) {
2238 err = -EAGAIN;
2239 goto _end_unlock;
2240 }
2241 runtime->twake = min_t(snd_pcm_uframes_t, size,
2242 runtime->control->avail_min ? : 1);
2243 err = wait_for_avail(substream, &avail);
2244 if (err < 0)
2245 goto _end_unlock;
2246 if (!avail)
2247 continue;
2248 }
2249 frames = size > avail ? avail : size;
2250 appl_ptr = READ_ONCE(runtime->control->appl_ptr);
2251 appl_ofs = appl_ptr % runtime->buffer_size;
2252 cont = runtime->buffer_size - appl_ofs;
2253 if (frames > cont)
2254 frames = cont;
2255 if (snd_BUG_ON(!frames)) {
2256 err = -EINVAL;
2257 goto _end_unlock;
2258 }
2259 snd_pcm_stream_unlock_irq(substream);
2260 if (!is_playback)
2261 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
2262 err = writer(substream, appl_ofs, data, offset, frames,
2263 transfer);
2264 if (is_playback)
2265 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
2266 snd_pcm_stream_lock_irq(substream);
2267 if (err < 0)
2268 goto _end_unlock;
2269 err = pcm_accessible_state(runtime);
2270 if (err < 0)
2271 goto _end_unlock;
2272 appl_ptr += frames;
2273 if (appl_ptr >= runtime->boundary)
2274 appl_ptr -= runtime->boundary;
2275 err = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2276 if (err < 0)
2277 goto _end_unlock;
2278
2279 offset += frames;
2280 size -= frames;
2281 xfer += frames;
2282 avail -= frames;
2283 if (is_playback &&
2284 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2285 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2286 err = snd_pcm_start(substream);
2287 if (err < 0)
2288 goto _end_unlock;
2289 }
2290 }
2291 _end_unlock:
2292 runtime->twake = 0;
2293 if (xfer > 0 && err >= 0)
2294 snd_pcm_update_state(substream, runtime);
2295 snd_pcm_stream_unlock_irq(substream);
2296 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2297}
2298EXPORT_SYMBOL(__snd_pcm_lib_xfer);
2299
2300
2301
2302
2303
2304
2305const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2306 { .channels = 1,
2307 .map = { SNDRV_CHMAP_MONO } },
2308 { .channels = 2,
2309 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2310 { .channels = 4,
2311 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2312 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2313 { .channels = 6,
2314 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2315 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2316 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2317 { .channels = 8,
2318 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2319 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2320 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2321 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2322 { }
2323};
2324EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2325
2326
2327const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2328 { .channels = 1,
2329 .map = { SNDRV_CHMAP_MONO } },
2330 { .channels = 2,
2331 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2332 { .channels = 4,
2333 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2334 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2335 { .channels = 6,
2336 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2337 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2338 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2339 { .channels = 8,
2340 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2341 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2342 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2343 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2344 { }
2345};
2346EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2347
2348static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2349{
2350 if (ch > info->max_channels)
2351 return false;
2352 return !info->channel_mask || (info->channel_mask & (1U << ch));
2353}
2354
2355static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2356 struct snd_ctl_elem_info *uinfo)
2357{
2358 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2359
2360 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2361 uinfo->count = info->max_channels;
2362 uinfo->value.integer.min = 0;
2363 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2364 return 0;
2365}
2366
2367
2368
2369
2370static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2371 struct snd_ctl_elem_value *ucontrol)
2372{
2373 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2374 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2375 struct snd_pcm_substream *substream;
2376 const struct snd_pcm_chmap_elem *map;
2377
2378 if (!info->chmap)
2379 return -EINVAL;
2380 substream = snd_pcm_chmap_substream(info, idx);
2381 if (!substream)
2382 return -ENODEV;
2383 memset(ucontrol->value.integer.value, 0,
2384 sizeof(long) * info->max_channels);
2385 if (!substream->runtime)
2386 return 0;
2387 for (map = info->chmap; map->channels; map++) {
2388 int i;
2389 if (map->channels == substream->runtime->channels &&
2390 valid_chmap_channels(info, map->channels)) {
2391 for (i = 0; i < map->channels; i++)
2392 ucontrol->value.integer.value[i] = map->map[i];
2393 return 0;
2394 }
2395 }
2396 return -EINVAL;
2397}
2398
2399
2400
2401
2402static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2403 unsigned int size, unsigned int __user *tlv)
2404{
2405 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2406 const struct snd_pcm_chmap_elem *map;
2407 unsigned int __user *dst;
2408 int c, count = 0;
2409
2410 if (!info->chmap)
2411 return -EINVAL;
2412 if (size < 8)
2413 return -ENOMEM;
2414 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2415 return -EFAULT;
2416 size -= 8;
2417 dst = tlv + 2;
2418 for (map = info->chmap; map->channels; map++) {
2419 int chs_bytes = map->channels * 4;
2420 if (!valid_chmap_channels(info, map->channels))
2421 continue;
2422 if (size < 8)
2423 return -ENOMEM;
2424 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2425 put_user(chs_bytes, dst + 1))
2426 return -EFAULT;
2427 dst += 2;
2428 size -= 8;
2429 count += 8;
2430 if (size < chs_bytes)
2431 return -ENOMEM;
2432 size -= chs_bytes;
2433 count += chs_bytes;
2434 for (c = 0; c < map->channels; c++) {
2435 if (put_user(map->map[c], dst))
2436 return -EFAULT;
2437 dst++;
2438 }
2439 }
2440 if (put_user(count, tlv + 1))
2441 return -EFAULT;
2442 return 0;
2443}
2444
2445static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2446{
2447 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2448 info->pcm->streams[info->stream].chmap_kctl = NULL;
2449 kfree(info);
2450}
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2465 const struct snd_pcm_chmap_elem *chmap,
2466 int max_channels,
2467 unsigned long private_value,
2468 struct snd_pcm_chmap **info_ret)
2469{
2470 struct snd_pcm_chmap *info;
2471 struct snd_kcontrol_new knew = {
2472 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2473 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2474 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2475 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2476 .info = pcm_chmap_ctl_info,
2477 .get = pcm_chmap_ctl_get,
2478 .tlv.c = pcm_chmap_ctl_tlv,
2479 };
2480 int err;
2481
2482 if (WARN_ON(pcm->streams[stream].chmap_kctl))
2483 return -EBUSY;
2484 info = kzalloc(sizeof(*info), GFP_KERNEL);
2485 if (!info)
2486 return -ENOMEM;
2487 info->pcm = pcm;
2488 info->stream = stream;
2489 info->chmap = chmap;
2490 info->max_channels = max_channels;
2491 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2492 knew.name = "Playback Channel Map";
2493 else
2494 knew.name = "Capture Channel Map";
2495 knew.device = pcm->device;
2496 knew.count = pcm->streams[stream].substream_count;
2497 knew.private_value = private_value;
2498 info->kctl = snd_ctl_new1(&knew, info);
2499 if (!info->kctl) {
2500 kfree(info);
2501 return -ENOMEM;
2502 }
2503 info->kctl->private_free = pcm_chmap_ctl_private_free;
2504 err = snd_ctl_add(pcm->card, info->kctl);
2505 if (err < 0)
2506 return err;
2507 pcm->streams[stream].chmap_kctl = info->kctl;
2508 if (info_ret)
2509 *info_ret = info;
2510 return 0;
2511}
2512EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);
2513