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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 struct timespec64 tstamp;
149
150 snd_pcm_gettime(runtime, &tstamp);
151 runtime->status->tstamp.tv_sec = tstamp.tv_sec;
152 runtime->status->tstamp.tv_nsec = tstamp.tv_nsec;
153 }
154 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
155 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
156 char name[16];
157 snd_pcm_debug_name(substream, name, sizeof(name));
158 pcm_warn(substream->pcm, "XRUN: %s\n", name);
159 dump_stack_on_xrun(substream);
160 }
161}
162
163#ifdef CONFIG_SND_PCM_XRUN_DEBUG
164#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
165 do { \
166 trace_hw_ptr_error(substream, reason); \
167 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
168 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
169 (in_interrupt) ? 'Q' : 'P', ##args); \
170 dump_stack_on_xrun(substream); \
171 } \
172 } while (0)
173
174#else
175
176#define hw_ptr_error(substream, fmt, args...) do { } while (0)
177
178#endif
179
180int snd_pcm_update_state(struct snd_pcm_substream *substream,
181 struct snd_pcm_runtime *runtime)
182{
183 snd_pcm_uframes_t avail;
184
185 avail = snd_pcm_avail(substream);
186 if (avail > runtime->avail_max)
187 runtime->avail_max = avail;
188 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
189 if (avail >= runtime->buffer_size) {
190 snd_pcm_drain_done(substream);
191 return -EPIPE;
192 }
193 } else {
194 if (avail >= runtime->stop_threshold) {
195 __snd_pcm_xrun(substream);
196 return -EPIPE;
197 }
198 }
199 if (runtime->twake) {
200 if (avail >= runtime->twake)
201 wake_up(&runtime->tsleep);
202 } else if (avail >= runtime->control->avail_min)
203 wake_up(&runtime->sleep);
204 return 0;
205}
206
207static void update_audio_tstamp(struct snd_pcm_substream *substream,
208 struct timespec64 *curr_tstamp,
209 struct timespec64 *audio_tstamp)
210{
211 struct snd_pcm_runtime *runtime = substream->runtime;
212 u64 audio_frames, audio_nsecs;
213 struct timespec64 driver_tstamp;
214
215 if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
216 return;
217
218 if (!(substream->ops->get_time_info) ||
219 (runtime->audio_tstamp_report.actual_type ==
220 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
221
222
223
224
225
226
227 audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
228
229 if (runtime->audio_tstamp_config.report_delay) {
230 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
231 audio_frames -= runtime->delay;
232 else
233 audio_frames += runtime->delay;
234 }
235 audio_nsecs = div_u64(audio_frames * 1000000000LL,
236 runtime->rate);
237 *audio_tstamp = ns_to_timespec64(audio_nsecs);
238 }
239
240 if (runtime->status->audio_tstamp.tv_sec != audio_tstamp->tv_sec ||
241 runtime->status->audio_tstamp.tv_nsec != audio_tstamp->tv_nsec) {
242 runtime->status->audio_tstamp.tv_sec = audio_tstamp->tv_sec;
243 runtime->status->audio_tstamp.tv_nsec = audio_tstamp->tv_nsec;
244 runtime->status->tstamp.tv_sec = curr_tstamp->tv_sec;
245 runtime->status->tstamp.tv_nsec = curr_tstamp->tv_nsec;
246 }
247
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249
250
251
252
253 snd_pcm_gettime(substream->runtime, &driver_tstamp);
254 runtime->driver_tstamp = driver_tstamp;
255}
256
257static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
258 unsigned int in_interrupt)
259{
260 struct snd_pcm_runtime *runtime = substream->runtime;
261 snd_pcm_uframes_t pos;
262 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
263 snd_pcm_sframes_t hdelta, delta;
264 unsigned long jdelta;
265 unsigned long curr_jiffies;
266 struct timespec64 curr_tstamp;
267 struct timespec64 audio_tstamp;
268 int crossed_boundary = 0;
269
270 old_hw_ptr = runtime->status->hw_ptr;
271
272
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275
276
277
278 pos = substream->ops->pointer(substream);
279 curr_jiffies = jiffies;
280 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
281 if ((substream->ops->get_time_info) &&
282 (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
283 substream->ops->get_time_info(substream, &curr_tstamp,
284 &audio_tstamp,
285 &runtime->audio_tstamp_config,
286 &runtime->audio_tstamp_report);
287
288
289 if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
290 snd_pcm_gettime(runtime, &curr_tstamp);
291 } else
292 snd_pcm_gettime(runtime, &curr_tstamp);
293 }
294
295 if (pos == SNDRV_PCM_POS_XRUN) {
296 __snd_pcm_xrun(substream);
297 return -EPIPE;
298 }
299 if (pos >= runtime->buffer_size) {
300 if (printk_ratelimit()) {
301 char name[16];
302 snd_pcm_debug_name(substream, name, sizeof(name));
303 pcm_err(substream->pcm,
304 "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
305 name, pos, runtime->buffer_size,
306 runtime->period_size);
307 }
308 pos = 0;
309 }
310 pos -= pos % runtime->min_align;
311 trace_hwptr(substream, pos, in_interrupt);
312 hw_base = runtime->hw_ptr_base;
313 new_hw_ptr = hw_base + pos;
314 if (in_interrupt) {
315
316
317 delta = runtime->hw_ptr_interrupt + runtime->period_size;
318 if (delta > new_hw_ptr) {
319
320 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
321 if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
322 hw_base += runtime->buffer_size;
323 if (hw_base >= runtime->boundary) {
324 hw_base = 0;
325 crossed_boundary++;
326 }
327 new_hw_ptr = hw_base + pos;
328 goto __delta;
329 }
330 }
331 }
332
333
334 if (new_hw_ptr < old_hw_ptr) {
335 hw_base += runtime->buffer_size;
336 if (hw_base >= runtime->boundary) {
337 hw_base = 0;
338 crossed_boundary++;
339 }
340 new_hw_ptr = hw_base + pos;
341 }
342 __delta:
343 delta = new_hw_ptr - old_hw_ptr;
344 if (delta < 0)
345 delta += runtime->boundary;
346
347 if (runtime->no_period_wakeup) {
348 snd_pcm_sframes_t xrun_threshold;
349
350
351
352
353 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
354 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
355 goto no_delta_check;
356 hdelta = jdelta - delta * HZ / runtime->rate;
357 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
358 while (hdelta > xrun_threshold) {
359 delta += runtime->buffer_size;
360 hw_base += runtime->buffer_size;
361 if (hw_base >= runtime->boundary) {
362 hw_base = 0;
363 crossed_boundary++;
364 }
365 new_hw_ptr = hw_base + pos;
366 hdelta -= runtime->hw_ptr_buffer_jiffies;
367 }
368 goto no_delta_check;
369 }
370
371
372 if (delta >= runtime->buffer_size + runtime->period_size) {
373 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
374 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
375 substream->stream, (long)pos,
376 (long)new_hw_ptr, (long)old_hw_ptr);
377 return 0;
378 }
379
380
381 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
382 goto no_jiffies_check;
383
384
385
386
387
388 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
389 goto no_jiffies_check;
390 hdelta = delta;
391 if (hdelta < runtime->delay)
392 goto no_jiffies_check;
393 hdelta -= runtime->delay;
394 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
395 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
396 delta = jdelta /
397 (((runtime->period_size * HZ) / runtime->rate)
398 + HZ/100);
399
400 new_hw_ptr = old_hw_ptr;
401 hw_base = delta;
402
403
404 while (delta > 0) {
405 new_hw_ptr += runtime->period_size;
406 if (new_hw_ptr >= runtime->boundary) {
407 new_hw_ptr -= runtime->boundary;
408 crossed_boundary--;
409 }
410 delta--;
411 }
412
413 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
414 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
415 (long)pos, (long)hdelta,
416 (long)runtime->period_size, jdelta,
417 ((hdelta * HZ) / runtime->rate), hw_base,
418 (unsigned long)old_hw_ptr,
419 (unsigned long)new_hw_ptr);
420
421 delta = 0;
422 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
423 }
424 no_jiffies_check:
425 if (delta > runtime->period_size + runtime->period_size / 2) {
426 hw_ptr_error(substream, in_interrupt,
427 "Lost interrupts?",
428 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
429 substream->stream, (long)delta,
430 (long)new_hw_ptr,
431 (long)old_hw_ptr);
432 }
433
434 no_delta_check:
435 if (runtime->status->hw_ptr == new_hw_ptr) {
436 runtime->hw_ptr_jiffies = curr_jiffies;
437 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
438 return 0;
439 }
440
441 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
442 runtime->silence_size > 0)
443 snd_pcm_playback_silence(substream, new_hw_ptr);
444
445 if (in_interrupt) {
446 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
447 if (delta < 0)
448 delta += runtime->boundary;
449 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
450 runtime->hw_ptr_interrupt += delta;
451 if (runtime->hw_ptr_interrupt >= runtime->boundary)
452 runtime->hw_ptr_interrupt -= runtime->boundary;
453 }
454 runtime->hw_ptr_base = hw_base;
455 runtime->status->hw_ptr = new_hw_ptr;
456 runtime->hw_ptr_jiffies = curr_jiffies;
457 if (crossed_boundary) {
458 snd_BUG_ON(crossed_boundary != 1);
459 runtime->hw_ptr_wrap += runtime->boundary;
460 }
461
462 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
463
464 return snd_pcm_update_state(substream, runtime);
465}
466
467
468int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
469{
470 return snd_pcm_update_hw_ptr0(substream, 0);
471}
472
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480
481void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
482 const struct snd_pcm_ops *ops)
483{
484 struct snd_pcm_str *stream = &pcm->streams[direction];
485 struct snd_pcm_substream *substream;
486
487 for (substream = stream->substream; substream != NULL; substream = substream->next)
488 substream->ops = ops;
489}
490EXPORT_SYMBOL(snd_pcm_set_ops);
491
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497
498void snd_pcm_set_sync(struct snd_pcm_substream *substream)
499{
500 struct snd_pcm_runtime *runtime = substream->runtime;
501
502 runtime->sync.id32[0] = substream->pcm->card->number;
503 runtime->sync.id32[1] = -1;
504 runtime->sync.id32[2] = -1;
505 runtime->sync.id32[3] = -1;
506}
507EXPORT_SYMBOL(snd_pcm_set_sync);
508
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512
513static inline unsigned int div32(unsigned int a, unsigned int b,
514 unsigned int *r)
515{
516 if (b == 0) {
517 *r = 0;
518 return UINT_MAX;
519 }
520 *r = a % b;
521 return a / b;
522}
523
524static inline unsigned int div_down(unsigned int a, unsigned int b)
525{
526 if (b == 0)
527 return UINT_MAX;
528 return a / b;
529}
530
531static inline unsigned int div_up(unsigned int a, unsigned int b)
532{
533 unsigned int r;
534 unsigned int q;
535 if (b == 0)
536 return UINT_MAX;
537 q = div32(a, b, &r);
538 if (r)
539 ++q;
540 return q;
541}
542
543static inline unsigned int mul(unsigned int a, unsigned int b)
544{
545 if (a == 0)
546 return 0;
547 if (div_down(UINT_MAX, a) < b)
548 return UINT_MAX;
549 return a * b;
550}
551
552static inline unsigned int muldiv32(unsigned int a, unsigned int b,
553 unsigned int c, unsigned int *r)
554{
555 u_int64_t n = (u_int64_t) a * b;
556 if (c == 0) {
557 *r = 0;
558 return UINT_MAX;
559 }
560 n = div_u64_rem(n, c, r);
561 if (n >= UINT_MAX) {
562 *r = 0;
563 return UINT_MAX;
564 }
565 return n;
566}
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579
580int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
581{
582 int changed = 0;
583 if (snd_BUG_ON(snd_interval_empty(i)))
584 return -EINVAL;
585 if (i->min < v->min) {
586 i->min = v->min;
587 i->openmin = v->openmin;
588 changed = 1;
589 } else if (i->min == v->min && !i->openmin && v->openmin) {
590 i->openmin = 1;
591 changed = 1;
592 }
593 if (i->max > v->max) {
594 i->max = v->max;
595 i->openmax = v->openmax;
596 changed = 1;
597 } else if (i->max == v->max && !i->openmax && v->openmax) {
598 i->openmax = 1;
599 changed = 1;
600 }
601 if (!i->integer && v->integer) {
602 i->integer = 1;
603 changed = 1;
604 }
605 if (i->integer) {
606 if (i->openmin) {
607 i->min++;
608 i->openmin = 0;
609 }
610 if (i->openmax) {
611 i->max--;
612 i->openmax = 0;
613 }
614 } else if (!i->openmin && !i->openmax && i->min == i->max)
615 i->integer = 1;
616 if (snd_interval_checkempty(i)) {
617 snd_interval_none(i);
618 return -EINVAL;
619 }
620 return changed;
621}
622EXPORT_SYMBOL(snd_interval_refine);
623
624static int snd_interval_refine_first(struct snd_interval *i)
625{
626 const unsigned int last_max = i->max;
627
628 if (snd_BUG_ON(snd_interval_empty(i)))
629 return -EINVAL;
630 if (snd_interval_single(i))
631 return 0;
632 i->max = i->min;
633 if (i->openmin)
634 i->max++;
635
636 i->openmax = (i->openmax && i->max >= last_max);
637 return 1;
638}
639
640static int snd_interval_refine_last(struct snd_interval *i)
641{
642 const unsigned int last_min = i->min;
643
644 if (snd_BUG_ON(snd_interval_empty(i)))
645 return -EINVAL;
646 if (snd_interval_single(i))
647 return 0;
648 i->min = i->max;
649 if (i->openmax)
650 i->min--;
651
652 i->openmin = (i->openmin && i->min <= last_min);
653 return 1;
654}
655
656void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
657{
658 if (a->empty || b->empty) {
659 snd_interval_none(c);
660 return;
661 }
662 c->empty = 0;
663 c->min = mul(a->min, b->min);
664 c->openmin = (a->openmin || b->openmin);
665 c->max = mul(a->max, b->max);
666 c->openmax = (a->openmax || b->openmax);
667 c->integer = (a->integer && b->integer);
668}
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679
680void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
681{
682 unsigned int r;
683 if (a->empty || b->empty) {
684 snd_interval_none(c);
685 return;
686 }
687 c->empty = 0;
688 c->min = div32(a->min, b->max, &r);
689 c->openmin = (r || a->openmin || b->openmax);
690 if (b->min > 0) {
691 c->max = div32(a->max, b->min, &r);
692 if (r) {
693 c->max++;
694 c->openmax = 1;
695 } else
696 c->openmax = (a->openmax || b->openmin);
697 } else {
698 c->max = UINT_MAX;
699 c->openmax = 0;
700 }
701 c->integer = 0;
702}
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714
715void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
716 unsigned int k, struct snd_interval *c)
717{
718 unsigned int r;
719 if (a->empty || b->empty) {
720 snd_interval_none(c);
721 return;
722 }
723 c->empty = 0;
724 c->min = muldiv32(a->min, b->min, k, &r);
725 c->openmin = (r || a->openmin || b->openmin);
726 c->max = muldiv32(a->max, b->max, k, &r);
727 if (r) {
728 c->max++;
729 c->openmax = 1;
730 } else
731 c->openmax = (a->openmax || b->openmax);
732 c->integer = 0;
733}
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745
746void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
747 const struct snd_interval *b, struct snd_interval *c)
748{
749 unsigned int r;
750 if (a->empty || b->empty) {
751 snd_interval_none(c);
752 return;
753 }
754 c->empty = 0;
755 c->min = muldiv32(a->min, k, b->max, &r);
756 c->openmin = (r || a->openmin || b->openmax);
757 if (b->min > 0) {
758 c->max = muldiv32(a->max, k, b->min, &r);
759 if (r) {
760 c->max++;
761 c->openmax = 1;
762 } else
763 c->openmax = (a->openmax || b->openmin);
764 } else {
765 c->max = UINT_MAX;
766 c->openmax = 0;
767 }
768 c->integer = 0;
769}
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777
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784
785int snd_interval_ratnum(struct snd_interval *i,
786 unsigned int rats_count, const struct snd_ratnum *rats,
787 unsigned int *nump, unsigned int *denp)
788{
789 unsigned int best_num, best_den;
790 int best_diff;
791 unsigned int k;
792 struct snd_interval t;
793 int err;
794 unsigned int result_num, result_den;
795 int result_diff;
796
797 best_num = best_den = best_diff = 0;
798 for (k = 0; k < rats_count; ++k) {
799 unsigned int num = rats[k].num;
800 unsigned int den;
801 unsigned int q = i->min;
802 int diff;
803 if (q == 0)
804 q = 1;
805 den = div_up(num, q);
806 if (den < rats[k].den_min)
807 continue;
808 if (den > rats[k].den_max)
809 den = rats[k].den_max;
810 else {
811 unsigned int r;
812 r = (den - rats[k].den_min) % rats[k].den_step;
813 if (r != 0)
814 den -= r;
815 }
816 diff = num - q * den;
817 if (diff < 0)
818 diff = -diff;
819 if (best_num == 0 ||
820 diff * best_den < best_diff * den) {
821 best_diff = diff;
822 best_den = den;
823 best_num = num;
824 }
825 }
826 if (best_den == 0) {
827 i->empty = 1;
828 return -EINVAL;
829 }
830 t.min = div_down(best_num, best_den);
831 t.openmin = !!(best_num % best_den);
832
833 result_num = best_num;
834 result_diff = best_diff;
835 result_den = best_den;
836 best_num = best_den = best_diff = 0;
837 for (k = 0; k < rats_count; ++k) {
838 unsigned int num = rats[k].num;
839 unsigned int den;
840 unsigned int q = i->max;
841 int diff;
842 if (q == 0) {
843 i->empty = 1;
844 return -EINVAL;
845 }
846 den = div_down(num, q);
847 if (den > rats[k].den_max)
848 continue;
849 if (den < rats[k].den_min)
850 den = rats[k].den_min;
851 else {
852 unsigned int r;
853 r = (den - rats[k].den_min) % rats[k].den_step;
854 if (r != 0)
855 den += rats[k].den_step - r;
856 }
857 diff = q * den - num;
858 if (diff < 0)
859 diff = -diff;
860 if (best_num == 0 ||
861 diff * best_den < best_diff * den) {
862 best_diff = diff;
863 best_den = den;
864 best_num = num;
865 }
866 }
867 if (best_den == 0) {
868 i->empty = 1;
869 return -EINVAL;
870 }
871 t.max = div_up(best_num, best_den);
872 t.openmax = !!(best_num % best_den);
873 t.integer = 0;
874 err = snd_interval_refine(i, &t);
875 if (err < 0)
876 return err;
877
878 if (snd_interval_single(i)) {
879 if (best_diff * result_den < result_diff * best_den) {
880 result_num = best_num;
881 result_den = best_den;
882 }
883 if (nump)
884 *nump = result_num;
885 if (denp)
886 *denp = result_den;
887 }
888 return err;
889}
890EXPORT_SYMBOL(snd_interval_ratnum);
891
892
893
894
895
896
897
898
899
900
901
902
903static int snd_interval_ratden(struct snd_interval *i,
904 unsigned int rats_count,
905 const struct snd_ratden *rats,
906 unsigned int *nump, unsigned int *denp)
907{
908 unsigned int best_num, best_diff, best_den;
909 unsigned int k;
910 struct snd_interval t;
911 int err;
912
913 best_num = best_den = best_diff = 0;
914 for (k = 0; k < rats_count; ++k) {
915 unsigned int num;
916 unsigned int den = rats[k].den;
917 unsigned int q = i->min;
918 int diff;
919 num = mul(q, den);
920 if (num > rats[k].num_max)
921 continue;
922 if (num < rats[k].num_min)
923 num = rats[k].num_max;
924 else {
925 unsigned int r;
926 r = (num - rats[k].num_min) % rats[k].num_step;
927 if (r != 0)
928 num += rats[k].num_step - r;
929 }
930 diff = num - q * den;
931 if (best_num == 0 ||
932 diff * best_den < best_diff * den) {
933 best_diff = diff;
934 best_den = den;
935 best_num = num;
936 }
937 }
938 if (best_den == 0) {
939 i->empty = 1;
940 return -EINVAL;
941 }
942 t.min = div_down(best_num, best_den);
943 t.openmin = !!(best_num % best_den);
944
945 best_num = best_den = best_diff = 0;
946 for (k = 0; k < rats_count; ++k) {
947 unsigned int num;
948 unsigned int den = rats[k].den;
949 unsigned int q = i->max;
950 int diff;
951 num = mul(q, den);
952 if (num < rats[k].num_min)
953 continue;
954 if (num > rats[k].num_max)
955 num = rats[k].num_max;
956 else {
957 unsigned int r;
958 r = (num - rats[k].num_min) % rats[k].num_step;
959 if (r != 0)
960 num -= r;
961 }
962 diff = q * den - num;
963 if (best_num == 0 ||
964 diff * best_den < best_diff * den) {
965 best_diff = diff;
966 best_den = den;
967 best_num = num;
968 }
969 }
970 if (best_den == 0) {
971 i->empty = 1;
972 return -EINVAL;
973 }
974 t.max = div_up(best_num, best_den);
975 t.openmax = !!(best_num % best_den);
976 t.integer = 0;
977 err = snd_interval_refine(i, &t);
978 if (err < 0)
979 return err;
980
981 if (snd_interval_single(i)) {
982 if (nump)
983 *nump = best_num;
984 if (denp)
985 *denp = best_den;
986 }
987 return err;
988}
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004int snd_interval_list(struct snd_interval *i, unsigned int count,
1005 const unsigned int *list, unsigned int mask)
1006{
1007 unsigned int k;
1008 struct snd_interval list_range;
1009
1010 if (!count) {
1011 i->empty = 1;
1012 return -EINVAL;
1013 }
1014 snd_interval_any(&list_range);
1015 list_range.min = UINT_MAX;
1016 list_range.max = 0;
1017 for (k = 0; k < count; k++) {
1018 if (mask && !(mask & (1 << k)))
1019 continue;
1020 if (!snd_interval_test(i, list[k]))
1021 continue;
1022 list_range.min = min(list_range.min, list[k]);
1023 list_range.max = max(list_range.max, list[k]);
1024 }
1025 return snd_interval_refine(i, &list_range);
1026}
1027EXPORT_SYMBOL(snd_interval_list);
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1044 const struct snd_interval *ranges, unsigned int mask)
1045{
1046 unsigned int k;
1047 struct snd_interval range_union;
1048 struct snd_interval range;
1049
1050 if (!count) {
1051 snd_interval_none(i);
1052 return -EINVAL;
1053 }
1054 snd_interval_any(&range_union);
1055 range_union.min = UINT_MAX;
1056 range_union.max = 0;
1057 for (k = 0; k < count; k++) {
1058 if (mask && !(mask & (1 << k)))
1059 continue;
1060 snd_interval_copy(&range, &ranges[k]);
1061 if (snd_interval_refine(&range, i) < 0)
1062 continue;
1063 if (snd_interval_empty(&range))
1064 continue;
1065
1066 if (range.min < range_union.min) {
1067 range_union.min = range.min;
1068 range_union.openmin = 1;
1069 }
1070 if (range.min == range_union.min && !range.openmin)
1071 range_union.openmin = 0;
1072 if (range.max > range_union.max) {
1073 range_union.max = range.max;
1074 range_union.openmax = 1;
1075 }
1076 if (range.max == range_union.max && !range.openmax)
1077 range_union.openmax = 0;
1078 }
1079 return snd_interval_refine(i, &range_union);
1080}
1081EXPORT_SYMBOL(snd_interval_ranges);
1082
1083static int snd_interval_step(struct snd_interval *i, unsigned int step)
1084{
1085 unsigned int n;
1086 int changed = 0;
1087 n = i->min % step;
1088 if (n != 0 || i->openmin) {
1089 i->min += step - n;
1090 i->openmin = 0;
1091 changed = 1;
1092 }
1093 n = i->max % step;
1094 if (n != 0 || i->openmax) {
1095 i->max -= n;
1096 i->openmax = 0;
1097 changed = 1;
1098 }
1099 if (snd_interval_checkempty(i)) {
1100 i->empty = 1;
1101 return -EINVAL;
1102 }
1103 return changed;
1104}
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1120 int var,
1121 snd_pcm_hw_rule_func_t func, void *private,
1122 int dep, ...)
1123{
1124 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1125 struct snd_pcm_hw_rule *c;
1126 unsigned int k;
1127 va_list args;
1128 va_start(args, dep);
1129 if (constrs->rules_num >= constrs->rules_all) {
1130 struct snd_pcm_hw_rule *new;
1131 unsigned int new_rules = constrs->rules_all + 16;
1132 new = krealloc_array(constrs->rules, new_rules,
1133 sizeof(*c), GFP_KERNEL);
1134 if (!new) {
1135 va_end(args);
1136 return -ENOMEM;
1137 }
1138 constrs->rules = new;
1139 constrs->rules_all = new_rules;
1140 }
1141 c = &constrs->rules[constrs->rules_num];
1142 c->cond = cond;
1143 c->func = func;
1144 c->var = var;
1145 c->private = private;
1146 k = 0;
1147 while (1) {
1148 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1149 va_end(args);
1150 return -EINVAL;
1151 }
1152 c->deps[k++] = dep;
1153 if (dep < 0)
1154 break;
1155 dep = va_arg(args, int);
1156 }
1157 constrs->rules_num++;
1158 va_end(args);
1159 return 0;
1160}
1161EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1174 u_int32_t mask)
1175{
1176 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1177 struct snd_mask *maskp = constrs_mask(constrs, var);
1178 *maskp->bits &= mask;
1179 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8);
1180 if (*maskp->bits == 0)
1181 return -EINVAL;
1182 return 0;
1183}
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1196 u_int64_t mask)
1197{
1198 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1199 struct snd_mask *maskp = constrs_mask(constrs, var);
1200 maskp->bits[0] &= (u_int32_t)mask;
1201 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1202 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8);
1203 if (! maskp->bits[0] && ! maskp->bits[1])
1204 return -EINVAL;
1205 return 0;
1206}
1207EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1220{
1221 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1222 return snd_interval_setinteger(constrs_interval(constrs, var));
1223}
1224EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1225
1226
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1231
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1233
1234
1235
1236
1237
1238int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1239 unsigned int min, unsigned int max)
1240{
1241 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1242 struct snd_interval t;
1243 t.min = min;
1244 t.max = max;
1245 t.openmin = t.openmax = 0;
1246 t.integer = 0;
1247 return snd_interval_refine(constrs_interval(constrs, var), &t);
1248}
1249EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1250
1251static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1252 struct snd_pcm_hw_rule *rule)
1253{
1254 struct snd_pcm_hw_constraint_list *list = rule->private;
1255 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1256}
1257
1258
1259
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1265
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1269
1270int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1271 unsigned int cond,
1272 snd_pcm_hw_param_t var,
1273 const struct snd_pcm_hw_constraint_list *l)
1274{
1275 return snd_pcm_hw_rule_add(runtime, cond, var,
1276 snd_pcm_hw_rule_list, (void *)l,
1277 var, -1);
1278}
1279EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1280
1281static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
1282 struct snd_pcm_hw_rule *rule)
1283{
1284 struct snd_pcm_hw_constraint_ranges *r = rule->private;
1285 return snd_interval_ranges(hw_param_interval(params, rule->var),
1286 r->count, r->ranges, r->mask);
1287}
1288
1289
1290
1291
1292
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1295
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1297
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1300
1301int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1302 unsigned int cond,
1303 snd_pcm_hw_param_t var,
1304 const struct snd_pcm_hw_constraint_ranges *r)
1305{
1306 return snd_pcm_hw_rule_add(runtime, cond, var,
1307 snd_pcm_hw_rule_ranges, (void *)r,
1308 var, -1);
1309}
1310EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
1311
1312static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1313 struct snd_pcm_hw_rule *rule)
1314{
1315 const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1316 unsigned int num = 0, den = 0;
1317 int err;
1318 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1319 r->nrats, r->rats, &num, &den);
1320 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1321 params->rate_num = num;
1322 params->rate_den = den;
1323 }
1324 return err;
1325}
1326
1327
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1329
1330
1331
1332
1333
1334
1335
1336int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1337 unsigned int cond,
1338 snd_pcm_hw_param_t var,
1339 const struct snd_pcm_hw_constraint_ratnums *r)
1340{
1341 return snd_pcm_hw_rule_add(runtime, cond, var,
1342 snd_pcm_hw_rule_ratnums, (void *)r,
1343 var, -1);
1344}
1345EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1346
1347static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1348 struct snd_pcm_hw_rule *rule)
1349{
1350 const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1351 unsigned int num = 0, den = 0;
1352 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1353 r->nrats, r->rats, &num, &den);
1354 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1355 params->rate_num = num;
1356 params->rate_den = den;
1357 }
1358 return err;
1359}
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1371 unsigned int cond,
1372 snd_pcm_hw_param_t var,
1373 const struct snd_pcm_hw_constraint_ratdens *r)
1374{
1375 return snd_pcm_hw_rule_add(runtime, cond, var,
1376 snd_pcm_hw_rule_ratdens, (void *)r,
1377 var, -1);
1378}
1379EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1380
1381static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1382 struct snd_pcm_hw_rule *rule)
1383{
1384 unsigned int l = (unsigned long) rule->private;
1385 int width = l & 0xffff;
1386 unsigned int msbits = l >> 16;
1387 const struct snd_interval *i =
1388 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1389
1390 if (!snd_interval_single(i))
1391 return 0;
1392
1393 if ((snd_interval_value(i) == width) ||
1394 (width == 0 && snd_interval_value(i) > msbits))
1395 params->msbits = min_not_zero(params->msbits, msbits);
1396
1397 return 0;
1398}
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
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1410
1411
1412
1413
1414int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1415 unsigned int cond,
1416 unsigned int width,
1417 unsigned int msbits)
1418{
1419 unsigned long l = (msbits << 16) | width;
1420 return snd_pcm_hw_rule_add(runtime, cond, -1,
1421 snd_pcm_hw_rule_msbits,
1422 (void*) l,
1423 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1424}
1425EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1426
1427static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1428 struct snd_pcm_hw_rule *rule)
1429{
1430 unsigned long step = (unsigned long) rule->private;
1431 return snd_interval_step(hw_param_interval(params, rule->var), step);
1432}
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1444 unsigned int cond,
1445 snd_pcm_hw_param_t var,
1446 unsigned long step)
1447{
1448 return snd_pcm_hw_rule_add(runtime, cond, var,
1449 snd_pcm_hw_rule_step, (void *) step,
1450 var, -1);
1451}
1452EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1453
1454static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1455{
1456 static const unsigned int pow2_sizes[] = {
1457 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1458 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1459 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1460 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1461 };
1462 return snd_interval_list(hw_param_interval(params, rule->var),
1463 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1464}
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1475 unsigned int cond,
1476 snd_pcm_hw_param_t var)
1477{
1478 return snd_pcm_hw_rule_add(runtime, cond, var,
1479 snd_pcm_hw_rule_pow2, NULL,
1480 var, -1);
1481}
1482EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1483
1484static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1485 struct snd_pcm_hw_rule *rule)
1486{
1487 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1488 struct snd_interval *rate;
1489
1490 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1491 return snd_interval_list(rate, 1, &base_rate, 0);
1492}
1493
1494
1495
1496
1497
1498
1499
1500
1501int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1502 unsigned int base_rate)
1503{
1504 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1505 SNDRV_PCM_HW_PARAM_RATE,
1506 snd_pcm_hw_rule_noresample_func,
1507 (void *)(uintptr_t)base_rate,
1508 SNDRV_PCM_HW_PARAM_RATE, -1);
1509}
1510EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1511
1512static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1513 snd_pcm_hw_param_t var)
1514{
1515 if (hw_is_mask(var)) {
1516 snd_mask_any(hw_param_mask(params, var));
1517 params->cmask |= 1 << var;
1518 params->rmask |= 1 << var;
1519 return;
1520 }
1521 if (hw_is_interval(var)) {
1522 snd_interval_any(hw_param_interval(params, var));
1523 params->cmask |= 1 << var;
1524 params->rmask |= 1 << var;
1525 return;
1526 }
1527 snd_BUG();
1528}
1529
1530void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1531{
1532 unsigned int k;
1533 memset(params, 0, sizeof(*params));
1534 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1535 _snd_pcm_hw_param_any(params, k);
1536 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1537 _snd_pcm_hw_param_any(params, k);
1538 params->info = ~0U;
1539}
1540EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1552 snd_pcm_hw_param_t var, int *dir)
1553{
1554 if (hw_is_mask(var)) {
1555 const struct snd_mask *mask = hw_param_mask_c(params, var);
1556 if (!snd_mask_single(mask))
1557 return -EINVAL;
1558 if (dir)
1559 *dir = 0;
1560 return snd_mask_value(mask);
1561 }
1562 if (hw_is_interval(var)) {
1563 const struct snd_interval *i = hw_param_interval_c(params, var);
1564 if (!snd_interval_single(i))
1565 return -EINVAL;
1566 if (dir)
1567 *dir = i->openmin;
1568 return snd_interval_value(i);
1569 }
1570 return -EINVAL;
1571}
1572EXPORT_SYMBOL(snd_pcm_hw_param_value);
1573
1574void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1575 snd_pcm_hw_param_t var)
1576{
1577 if (hw_is_mask(var)) {
1578 snd_mask_none(hw_param_mask(params, var));
1579 params->cmask |= 1 << var;
1580 params->rmask |= 1 << var;
1581 } else if (hw_is_interval(var)) {
1582 snd_interval_none(hw_param_interval(params, var));
1583 params->cmask |= 1 << var;
1584 params->rmask |= 1 << var;
1585 } else {
1586 snd_BUG();
1587 }
1588}
1589EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1590
1591static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1592 snd_pcm_hw_param_t var)
1593{
1594 int changed;
1595 if (hw_is_mask(var))
1596 changed = snd_mask_refine_first(hw_param_mask(params, var));
1597 else if (hw_is_interval(var))
1598 changed = snd_interval_refine_first(hw_param_interval(params, var));
1599 else
1600 return -EINVAL;
1601 if (changed > 0) {
1602 params->cmask |= 1 << var;
1603 params->rmask |= 1 << var;
1604 }
1605 return changed;
1606}
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1622 struct snd_pcm_hw_params *params,
1623 snd_pcm_hw_param_t var, int *dir)
1624{
1625 int changed = _snd_pcm_hw_param_first(params, var);
1626 if (changed < 0)
1627 return changed;
1628 if (params->rmask) {
1629 int err = snd_pcm_hw_refine(pcm, params);
1630 if (err < 0)
1631 return err;
1632 }
1633 return snd_pcm_hw_param_value(params, var, dir);
1634}
1635EXPORT_SYMBOL(snd_pcm_hw_param_first);
1636
1637static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1638 snd_pcm_hw_param_t var)
1639{
1640 int changed;
1641 if (hw_is_mask(var))
1642 changed = snd_mask_refine_last(hw_param_mask(params, var));
1643 else if (hw_is_interval(var))
1644 changed = snd_interval_refine_last(hw_param_interval(params, var));
1645 else
1646 return -EINVAL;
1647 if (changed > 0) {
1648 params->cmask |= 1 << var;
1649 params->rmask |= 1 << var;
1650 }
1651 return changed;
1652}
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1668 struct snd_pcm_hw_params *params,
1669 snd_pcm_hw_param_t var, int *dir)
1670{
1671 int changed = _snd_pcm_hw_param_last(params, var);
1672 if (changed < 0)
1673 return changed;
1674 if (params->rmask) {
1675 int err = snd_pcm_hw_refine(pcm, params);
1676 if (err < 0)
1677 return err;
1678 }
1679 return snd_pcm_hw_param_value(params, var, dir);
1680}
1681EXPORT_SYMBOL(snd_pcm_hw_param_last);
1682
1683static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1684 void *arg)
1685{
1686 struct snd_pcm_runtime *runtime = substream->runtime;
1687 unsigned long flags;
1688 snd_pcm_stream_lock_irqsave(substream, flags);
1689 if (snd_pcm_running(substream) &&
1690 snd_pcm_update_hw_ptr(substream) >= 0)
1691 runtime->status->hw_ptr %= runtime->buffer_size;
1692 else {
1693 runtime->status->hw_ptr = 0;
1694 runtime->hw_ptr_wrap = 0;
1695 }
1696 snd_pcm_stream_unlock_irqrestore(substream, flags);
1697 return 0;
1698}
1699
1700static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1701 void *arg)
1702{
1703 struct snd_pcm_channel_info *info = arg;
1704 struct snd_pcm_runtime *runtime = substream->runtime;
1705 int width;
1706 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1707 info->offset = -1;
1708 return 0;
1709 }
1710 width = snd_pcm_format_physical_width(runtime->format);
1711 if (width < 0)
1712 return width;
1713 info->offset = 0;
1714 switch (runtime->access) {
1715 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1716 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1717 info->first = info->channel * width;
1718 info->step = runtime->channels * width;
1719 break;
1720 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1721 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1722 {
1723 size_t size = runtime->dma_bytes / runtime->channels;
1724 info->first = info->channel * size * 8;
1725 info->step = width;
1726 break;
1727 }
1728 default:
1729 snd_BUG();
1730 break;
1731 }
1732 return 0;
1733}
1734
1735static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1736 void *arg)
1737{
1738 struct snd_pcm_hw_params *params = arg;
1739 snd_pcm_format_t format;
1740 int channels;
1741 ssize_t frame_size;
1742
1743 params->fifo_size = substream->runtime->hw.fifo_size;
1744 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1745 format = params_format(params);
1746 channels = params_channels(params);
1747 frame_size = snd_pcm_format_size(format, channels);
1748 if (frame_size > 0)
1749 params->fifo_size /= (unsigned)frame_size;
1750 }
1751 return 0;
1752}
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1766 unsigned int cmd, void *arg)
1767{
1768 switch (cmd) {
1769 case SNDRV_PCM_IOCTL1_RESET:
1770 return snd_pcm_lib_ioctl_reset(substream, arg);
1771 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1772 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1773 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1774 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1775 }
1776 return -ENXIO;
1777}
1778EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1792{
1793 struct snd_pcm_runtime *runtime;
1794 unsigned long flags;
1795
1796 if (snd_BUG_ON(!substream))
1797 return;
1798
1799 snd_pcm_stream_lock_irqsave(substream, flags);
1800 if (PCM_RUNTIME_CHECK(substream))
1801 goto _unlock;
1802 runtime = substream->runtime;
1803
1804 if (!snd_pcm_running(substream) ||
1805 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1806 goto _end;
1807
1808#ifdef CONFIG_SND_PCM_TIMER
1809 if (substream->timer_running)
1810 snd_timer_interrupt(substream->timer, 1);
1811#endif
1812 _end:
1813 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1814 _unlock:
1815 snd_pcm_stream_unlock_irqrestore(substream, flags);
1816}
1817EXPORT_SYMBOL(snd_pcm_period_elapsed);
1818
1819
1820
1821
1822
1823
1824
1825static int wait_for_avail(struct snd_pcm_substream *substream,
1826 snd_pcm_uframes_t *availp)
1827{
1828 struct snd_pcm_runtime *runtime = substream->runtime;
1829 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1830 wait_queue_entry_t wait;
1831 int err = 0;
1832 snd_pcm_uframes_t avail = 0;
1833 long wait_time, tout;
1834
1835 init_waitqueue_entry(&wait, current);
1836 set_current_state(TASK_INTERRUPTIBLE);
1837 add_wait_queue(&runtime->tsleep, &wait);
1838
1839 if (runtime->no_period_wakeup)
1840 wait_time = MAX_SCHEDULE_TIMEOUT;
1841 else {
1842
1843 if (substream->wait_time) {
1844 wait_time = substream->wait_time;
1845 } else {
1846 wait_time = 10;
1847
1848 if (runtime->rate) {
1849 long t = runtime->period_size * 2 /
1850 runtime->rate;
1851 wait_time = max(t, wait_time);
1852 }
1853 wait_time = msecs_to_jiffies(wait_time * 1000);
1854 }
1855 }
1856
1857 for (;;) {
1858 if (signal_pending(current)) {
1859 err = -ERESTARTSYS;
1860 break;
1861 }
1862
1863
1864
1865
1866
1867
1868
1869
1870 avail = snd_pcm_avail(substream);
1871 if (avail >= runtime->twake)
1872 break;
1873 snd_pcm_stream_unlock_irq(substream);
1874
1875 tout = schedule_timeout(wait_time);
1876
1877 snd_pcm_stream_lock_irq(substream);
1878 set_current_state(TASK_INTERRUPTIBLE);
1879 switch (runtime->status->state) {
1880 case SNDRV_PCM_STATE_SUSPENDED:
1881 err = -ESTRPIPE;
1882 goto _endloop;
1883 case SNDRV_PCM_STATE_XRUN:
1884 err = -EPIPE;
1885 goto _endloop;
1886 case SNDRV_PCM_STATE_DRAINING:
1887 if (is_playback)
1888 err = -EPIPE;
1889 else
1890 avail = 0;
1891 goto _endloop;
1892 case SNDRV_PCM_STATE_OPEN:
1893 case SNDRV_PCM_STATE_SETUP:
1894 case SNDRV_PCM_STATE_DISCONNECTED:
1895 err = -EBADFD;
1896 goto _endloop;
1897 case SNDRV_PCM_STATE_PAUSED:
1898 continue;
1899 }
1900 if (!tout) {
1901 pcm_dbg(substream->pcm,
1902 "%s write error (DMA or IRQ trouble?)\n",
1903 is_playback ? "playback" : "capture");
1904 err = -EIO;
1905 break;
1906 }
1907 }
1908 _endloop:
1909 set_current_state(TASK_RUNNING);
1910 remove_wait_queue(&runtime->tsleep, &wait);
1911 *availp = avail;
1912 return err;
1913}
1914
1915typedef int (*pcm_transfer_f)(struct snd_pcm_substream *substream,
1916 int channel, unsigned long hwoff,
1917 void *buf, unsigned long bytes);
1918
1919typedef int (*pcm_copy_f)(struct snd_pcm_substream *, snd_pcm_uframes_t, void *,
1920 snd_pcm_uframes_t, snd_pcm_uframes_t, pcm_transfer_f);
1921
1922
1923static void *get_dma_ptr(struct snd_pcm_runtime *runtime,
1924 int channel, unsigned long hwoff)
1925{
1926 return runtime->dma_area + hwoff +
1927 channel * (runtime->dma_bytes / runtime->channels);
1928}
1929
1930
1931static int default_write_copy(struct snd_pcm_substream *substream,
1932 int channel, unsigned long hwoff,
1933 void *buf, unsigned long bytes)
1934{
1935 if (copy_from_user(get_dma_ptr(substream->runtime, channel, hwoff),
1936 (void __user *)buf, bytes))
1937 return -EFAULT;
1938 return 0;
1939}
1940
1941
1942static int default_write_copy_kernel(struct snd_pcm_substream *substream,
1943 int channel, unsigned long hwoff,
1944 void *buf, unsigned long bytes)
1945{
1946 memcpy(get_dma_ptr(substream->runtime, channel, hwoff), buf, bytes);
1947 return 0;
1948}
1949
1950
1951
1952
1953
1954static int fill_silence(struct snd_pcm_substream *substream, int channel,
1955 unsigned long hwoff, void *buf, unsigned long bytes)
1956{
1957 struct snd_pcm_runtime *runtime = substream->runtime;
1958
1959 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
1960 return 0;
1961 if (substream->ops->fill_silence)
1962 return substream->ops->fill_silence(substream, channel,
1963 hwoff, bytes);
1964
1965 snd_pcm_format_set_silence(runtime->format,
1966 get_dma_ptr(runtime, channel, hwoff),
1967 bytes_to_samples(runtime, bytes));
1968 return 0;
1969}
1970
1971
1972static int default_read_copy(struct snd_pcm_substream *substream,
1973 int channel, unsigned long hwoff,
1974 void *buf, unsigned long bytes)
1975{
1976 if (copy_to_user((void __user *)buf,
1977 get_dma_ptr(substream->runtime, channel, hwoff),
1978 bytes))
1979 return -EFAULT;
1980 return 0;
1981}
1982
1983
1984static int default_read_copy_kernel(struct snd_pcm_substream *substream,
1985 int channel, unsigned long hwoff,
1986 void *buf, unsigned long bytes)
1987{
1988 memcpy(buf, get_dma_ptr(substream->runtime, channel, hwoff), bytes);
1989 return 0;
1990}
1991
1992
1993
1994
1995static int interleaved_copy(struct snd_pcm_substream *substream,
1996 snd_pcm_uframes_t hwoff, void *data,
1997 snd_pcm_uframes_t off,
1998 snd_pcm_uframes_t frames,
1999 pcm_transfer_f transfer)
2000{
2001 struct snd_pcm_runtime *runtime = substream->runtime;
2002
2003
2004 hwoff = frames_to_bytes(runtime, hwoff);
2005 off = frames_to_bytes(runtime, off);
2006 frames = frames_to_bytes(runtime, frames);
2007 return transfer(substream, 0, hwoff, data + off, frames);
2008}
2009
2010
2011
2012
2013static int noninterleaved_copy(struct snd_pcm_substream *substream,
2014 snd_pcm_uframes_t hwoff, void *data,
2015 snd_pcm_uframes_t off,
2016 snd_pcm_uframes_t frames,
2017 pcm_transfer_f transfer)
2018{
2019 struct snd_pcm_runtime *runtime = substream->runtime;
2020 int channels = runtime->channels;
2021 void **bufs = data;
2022 int c, err;
2023
2024
2025
2026
2027
2028 off = samples_to_bytes(runtime, off);
2029 frames = samples_to_bytes(runtime, frames);
2030 hwoff = samples_to_bytes(runtime, hwoff);
2031 for (c = 0; c < channels; ++c, ++bufs) {
2032 if (!data || !*bufs)
2033 err = fill_silence(substream, c, hwoff, NULL, frames);
2034 else
2035 err = transfer(substream, c, hwoff, *bufs + off,
2036 frames);
2037 if (err < 0)
2038 return err;
2039 }
2040 return 0;
2041}
2042
2043
2044
2045
2046static int fill_silence_frames(struct snd_pcm_substream *substream,
2047 snd_pcm_uframes_t off, snd_pcm_uframes_t frames)
2048{
2049 if (substream->runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
2050 substream->runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)
2051 return interleaved_copy(substream, off, NULL, 0, frames,
2052 fill_silence);
2053 else
2054 return noninterleaved_copy(substream, off, NULL, 0, frames,
2055 fill_silence);
2056}
2057
2058
2059static int pcm_sanity_check(struct snd_pcm_substream *substream)
2060{
2061 struct snd_pcm_runtime *runtime;
2062 if (PCM_RUNTIME_CHECK(substream))
2063 return -ENXIO;
2064 runtime = substream->runtime;
2065 if (snd_BUG_ON(!substream->ops->copy_user && !runtime->dma_area))
2066 return -EINVAL;
2067 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2068 return -EBADFD;
2069 return 0;
2070}
2071
2072static int pcm_accessible_state(struct snd_pcm_runtime *runtime)
2073{
2074 switch (runtime->status->state) {
2075 case SNDRV_PCM_STATE_PREPARED:
2076 case SNDRV_PCM_STATE_RUNNING:
2077 case SNDRV_PCM_STATE_PAUSED:
2078 return 0;
2079 case SNDRV_PCM_STATE_XRUN:
2080 return -EPIPE;
2081 case SNDRV_PCM_STATE_SUSPENDED:
2082 return -ESTRPIPE;
2083 default:
2084 return -EBADFD;
2085 }
2086}
2087
2088
2089
2090
2091int pcm_lib_apply_appl_ptr(struct snd_pcm_substream *substream,
2092 snd_pcm_uframes_t appl_ptr)
2093{
2094 struct snd_pcm_runtime *runtime = substream->runtime;
2095 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
2096 int ret;
2097
2098 if (old_appl_ptr == appl_ptr)
2099 return 0;
2100
2101 runtime->control->appl_ptr = appl_ptr;
2102 if (substream->ops->ack) {
2103 ret = substream->ops->ack(substream);
2104 if (ret < 0) {
2105 runtime->control->appl_ptr = old_appl_ptr;
2106 return ret;
2107 }
2108 }
2109
2110 trace_applptr(substream, old_appl_ptr, appl_ptr);
2111
2112 return 0;
2113}
2114
2115
2116snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
2117 void *data, bool interleaved,
2118 snd_pcm_uframes_t size, bool in_kernel)
2119{
2120 struct snd_pcm_runtime *runtime = substream->runtime;
2121 snd_pcm_uframes_t xfer = 0;
2122 snd_pcm_uframes_t offset = 0;
2123 snd_pcm_uframes_t avail;
2124 pcm_copy_f writer;
2125 pcm_transfer_f transfer;
2126 bool nonblock;
2127 bool is_playback;
2128 int err;
2129
2130 err = pcm_sanity_check(substream);
2131 if (err < 0)
2132 return err;
2133
2134 is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
2135 if (interleaved) {
2136 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2137 runtime->channels > 1)
2138 return -EINVAL;
2139 writer = interleaved_copy;
2140 } else {
2141 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2142 return -EINVAL;
2143 writer = noninterleaved_copy;
2144 }
2145
2146 if (!data) {
2147 if (is_playback)
2148 transfer = fill_silence;
2149 else
2150 return -EINVAL;
2151 } else if (in_kernel) {
2152 if (substream->ops->copy_kernel)
2153 transfer = substream->ops->copy_kernel;
2154 else
2155 transfer = is_playback ?
2156 default_write_copy_kernel : default_read_copy_kernel;
2157 } else {
2158 if (substream->ops->copy_user)
2159 transfer = (pcm_transfer_f)substream->ops->copy_user;
2160 else
2161 transfer = is_playback ?
2162 default_write_copy : default_read_copy;
2163 }
2164
2165 if (size == 0)
2166 return 0;
2167
2168 nonblock = !!(substream->f_flags & O_NONBLOCK);
2169
2170 snd_pcm_stream_lock_irq(substream);
2171 err = pcm_accessible_state(runtime);
2172 if (err < 0)
2173 goto _end_unlock;
2174
2175 runtime->twake = runtime->control->avail_min ? : 1;
2176 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2177 snd_pcm_update_hw_ptr(substream);
2178
2179
2180
2181
2182
2183 if (!is_playback &&
2184 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2185 size >= runtime->start_threshold) {
2186 err = snd_pcm_start(substream);
2187 if (err < 0)
2188 goto _end_unlock;
2189 }
2190
2191 avail = snd_pcm_avail(substream);
2192
2193 while (size > 0) {
2194 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2195 snd_pcm_uframes_t cont;
2196 if (!avail) {
2197 if (!is_playback &&
2198 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2199 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2200 goto _end_unlock;
2201 }
2202 if (nonblock) {
2203 err = -EAGAIN;
2204 goto _end_unlock;
2205 }
2206 runtime->twake = min_t(snd_pcm_uframes_t, size,
2207 runtime->control->avail_min ? : 1);
2208 err = wait_for_avail(substream, &avail);
2209 if (err < 0)
2210 goto _end_unlock;
2211 if (!avail)
2212 continue;
2213 }
2214 frames = size > avail ? avail : size;
2215 appl_ptr = READ_ONCE(runtime->control->appl_ptr);
2216 appl_ofs = appl_ptr % runtime->buffer_size;
2217 cont = runtime->buffer_size - appl_ofs;
2218 if (frames > cont)
2219 frames = cont;
2220 if (snd_BUG_ON(!frames)) {
2221 err = -EINVAL;
2222 goto _end_unlock;
2223 }
2224 snd_pcm_stream_unlock_irq(substream);
2225 err = writer(substream, appl_ofs, data, offset, frames,
2226 transfer);
2227 snd_pcm_stream_lock_irq(substream);
2228 if (err < 0)
2229 goto _end_unlock;
2230 err = pcm_accessible_state(runtime);
2231 if (err < 0)
2232 goto _end_unlock;
2233 appl_ptr += frames;
2234 if (appl_ptr >= runtime->boundary)
2235 appl_ptr -= runtime->boundary;
2236 err = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2237 if (err < 0)
2238 goto _end_unlock;
2239
2240 offset += frames;
2241 size -= frames;
2242 xfer += frames;
2243 avail -= frames;
2244 if (is_playback &&
2245 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2246 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2247 err = snd_pcm_start(substream);
2248 if (err < 0)
2249 goto _end_unlock;
2250 }
2251 }
2252 _end_unlock:
2253 runtime->twake = 0;
2254 if (xfer > 0 && err >= 0)
2255 snd_pcm_update_state(substream, runtime);
2256 snd_pcm_stream_unlock_irq(substream);
2257 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2258}
2259EXPORT_SYMBOL(__snd_pcm_lib_xfer);
2260
2261
2262
2263
2264
2265
2266const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2267 { .channels = 1,
2268 .map = { SNDRV_CHMAP_MONO } },
2269 { .channels = 2,
2270 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2271 { .channels = 4,
2272 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2273 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2274 { .channels = 6,
2275 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2276 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2277 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2278 { .channels = 8,
2279 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2280 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2281 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2282 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2283 { }
2284};
2285EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2286
2287
2288const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2289 { .channels = 1,
2290 .map = { SNDRV_CHMAP_MONO } },
2291 { .channels = 2,
2292 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2293 { .channels = 4,
2294 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2295 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2296 { .channels = 6,
2297 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2298 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2299 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2300 { .channels = 8,
2301 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2302 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2303 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2304 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2305 { }
2306};
2307EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2308
2309static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2310{
2311 if (ch > info->max_channels)
2312 return false;
2313 return !info->channel_mask || (info->channel_mask & (1U << ch));
2314}
2315
2316static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2317 struct snd_ctl_elem_info *uinfo)
2318{
2319 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2320
2321 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2322 uinfo->count = info->max_channels;
2323 uinfo->value.integer.min = 0;
2324 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2325 return 0;
2326}
2327
2328
2329
2330
2331static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2332 struct snd_ctl_elem_value *ucontrol)
2333{
2334 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2335 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2336 struct snd_pcm_substream *substream;
2337 const struct snd_pcm_chmap_elem *map;
2338
2339 if (!info->chmap)
2340 return -EINVAL;
2341 substream = snd_pcm_chmap_substream(info, idx);
2342 if (!substream)
2343 return -ENODEV;
2344 memset(ucontrol->value.integer.value, 0,
2345 sizeof(long) * info->max_channels);
2346 if (!substream->runtime)
2347 return 0;
2348 for (map = info->chmap; map->channels; map++) {
2349 int i;
2350 if (map->channels == substream->runtime->channels &&
2351 valid_chmap_channels(info, map->channels)) {
2352 for (i = 0; i < map->channels; i++)
2353 ucontrol->value.integer.value[i] = map->map[i];
2354 return 0;
2355 }
2356 }
2357 return -EINVAL;
2358}
2359
2360
2361
2362
2363static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2364 unsigned int size, unsigned int __user *tlv)
2365{
2366 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2367 const struct snd_pcm_chmap_elem *map;
2368 unsigned int __user *dst;
2369 int c, count = 0;
2370
2371 if (!info->chmap)
2372 return -EINVAL;
2373 if (size < 8)
2374 return -ENOMEM;
2375 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2376 return -EFAULT;
2377 size -= 8;
2378 dst = tlv + 2;
2379 for (map = info->chmap; map->channels; map++) {
2380 int chs_bytes = map->channels * 4;
2381 if (!valid_chmap_channels(info, map->channels))
2382 continue;
2383 if (size < 8)
2384 return -ENOMEM;
2385 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2386 put_user(chs_bytes, dst + 1))
2387 return -EFAULT;
2388 dst += 2;
2389 size -= 8;
2390 count += 8;
2391 if (size < chs_bytes)
2392 return -ENOMEM;
2393 size -= chs_bytes;
2394 count += chs_bytes;
2395 for (c = 0; c < map->channels; c++) {
2396 if (put_user(map->map[c], dst))
2397 return -EFAULT;
2398 dst++;
2399 }
2400 }
2401 if (put_user(count, tlv + 1))
2402 return -EFAULT;
2403 return 0;
2404}
2405
2406static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2407{
2408 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2409 info->pcm->streams[info->stream].chmap_kctl = NULL;
2410 kfree(info);
2411}
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2426 const struct snd_pcm_chmap_elem *chmap,
2427 int max_channels,
2428 unsigned long private_value,
2429 struct snd_pcm_chmap **info_ret)
2430{
2431 struct snd_pcm_chmap *info;
2432 struct snd_kcontrol_new knew = {
2433 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2434 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2435 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2436 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2437 .info = pcm_chmap_ctl_info,
2438 .get = pcm_chmap_ctl_get,
2439 .tlv.c = pcm_chmap_ctl_tlv,
2440 };
2441 int err;
2442
2443 if (WARN_ON(pcm->streams[stream].chmap_kctl))
2444 return -EBUSY;
2445 info = kzalloc(sizeof(*info), GFP_KERNEL);
2446 if (!info)
2447 return -ENOMEM;
2448 info->pcm = pcm;
2449 info->stream = stream;
2450 info->chmap = chmap;
2451 info->max_channels = max_channels;
2452 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2453 knew.name = "Playback Channel Map";
2454 else
2455 knew.name = "Capture Channel Map";
2456 knew.device = pcm->device;
2457 knew.count = pcm->streams[stream].substream_count;
2458 knew.private_value = private_value;
2459 info->kctl = snd_ctl_new1(&knew, info);
2460 if (!info->kctl) {
2461 kfree(info);
2462 return -ENOMEM;
2463 }
2464 info->kctl->private_free = pcm_chmap_ctl_private_free;
2465 err = snd_ctl_add(pcm->card, info->kctl);
2466 if (err < 0)
2467 return err;
2468 pcm->streams[stream].chmap_kctl = info->kctl;
2469 if (info_ret)
2470 *info_ret = info;
2471 return 0;
2472}
2473EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);
2474