2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Abramo Bagnara <abramo@alsa-project.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/slab.h>
24 #include <linux/sched/signal.h>
25 #include <linux/time.h>
26 #include <linux/math64.h>
27 #include <linux/export.h>
28 #include <sound/core.h>
29 #include <sound/control.h>
30 #include <sound/tlv.h>
31 #include <sound/info.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/timer.h>
36 #include "pcm_local.h"
38 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
39 #define CREATE_TRACE_POINTS
40 #include "pcm_trace.h"
42 #define trace_hwptr(substream, pos, in_interrupt)
43 #define trace_xrun(substream)
44 #define trace_hw_ptr_error(substream, reason)
45 #define trace_applptr(substream, prev, curr)
48 static int fill_silence_frames(struct snd_pcm_substream *substream,
49 snd_pcm_uframes_t off, snd_pcm_uframes_t frames);
52 * fill ring buffer with silence
53 * runtime->silence_start: starting pointer to silence area
54 * runtime->silence_filled: size filled with silence
55 * runtime->silence_threshold: threshold from application
56 * runtime->silence_size: maximal size from application
58 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
60 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
62 struct snd_pcm_runtime *runtime = substream->runtime;
63 snd_pcm_uframes_t frames, ofs, transfer;
66 if (runtime->silence_size < runtime->boundary) {
67 snd_pcm_sframes_t noise_dist, n;
68 snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr);
69 if (runtime->silence_start != appl_ptr) {
70 n = appl_ptr - runtime->silence_start;
72 n += runtime->boundary;
73 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
74 runtime->silence_filled -= n;
76 runtime->silence_filled = 0;
77 runtime->silence_start = appl_ptr;
79 if (runtime->silence_filled >= runtime->buffer_size)
81 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
82 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
84 frames = runtime->silence_threshold - noise_dist;
85 if (frames > runtime->silence_size)
86 frames = runtime->silence_size;
88 if (new_hw_ptr == ULONG_MAX) { /* initialization */
89 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
90 if (avail > runtime->buffer_size)
91 avail = runtime->buffer_size;
92 runtime->silence_filled = avail > 0 ? avail : 0;
93 runtime->silence_start = (runtime->status->hw_ptr +
94 runtime->silence_filled) %
97 ofs = runtime->status->hw_ptr;
98 frames = new_hw_ptr - ofs;
99 if ((snd_pcm_sframes_t)frames < 0)
100 frames += runtime->boundary;
101 runtime->silence_filled -= frames;
102 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
103 runtime->silence_filled = 0;
104 runtime->silence_start = new_hw_ptr;
106 runtime->silence_start = ofs;
109 frames = runtime->buffer_size - runtime->silence_filled;
111 if (snd_BUG_ON(frames > runtime->buffer_size))
115 ofs = runtime->silence_start % runtime->buffer_size;
117 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
118 err = fill_silence_frames(substream, ofs, transfer);
120 runtime->silence_filled += transfer;
126 #ifdef CONFIG_SND_DEBUG
127 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
128 char *name, size_t len)
130 snprintf(name, len, "pcmC%dD%d%c:%d",
131 substream->pcm->card->number,
132 substream->pcm->device,
133 substream->stream ? 'c' : 'p',
136 EXPORT_SYMBOL(snd_pcm_debug_name);
139 #define XRUN_DEBUG_BASIC (1<<0)
140 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
141 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
143 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
145 #define xrun_debug(substream, mask) \
146 ((substream)->pstr->xrun_debug & (mask))
148 #define xrun_debug(substream, mask) 0
151 #define dump_stack_on_xrun(substream) do { \
152 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
156 static void xrun(struct snd_pcm_substream *substream)
158 struct snd_pcm_runtime *runtime = substream->runtime;
160 trace_xrun(substream);
161 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
162 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
163 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
164 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
166 snd_pcm_debug_name(substream, name, sizeof(name));
167 pcm_warn(substream->pcm, "XRUN: %s\n", name);
168 dump_stack_on_xrun(substream);
172 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
173 #define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
175 trace_hw_ptr_error(substream, reason); \
176 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
177 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
178 (in_interrupt) ? 'Q' : 'P', ##args); \
179 dump_stack_on_xrun(substream); \
183 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
185 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
189 int snd_pcm_update_state(struct snd_pcm_substream *substream,
190 struct snd_pcm_runtime *runtime)
192 snd_pcm_uframes_t avail;
194 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
195 avail = snd_pcm_playback_avail(runtime);
197 avail = snd_pcm_capture_avail(runtime);
198 if (avail > runtime->avail_max)
199 runtime->avail_max = avail;
200 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
201 if (avail >= runtime->buffer_size) {
202 snd_pcm_drain_done(substream);
206 if (avail >= runtime->stop_threshold) {
211 if (runtime->twake) {
212 if (avail >= runtime->twake)
213 wake_up(&runtime->tsleep);
214 } else if (avail >= runtime->control->avail_min)
215 wake_up(&runtime->sleep);
219 static void update_audio_tstamp(struct snd_pcm_substream *substream,
220 struct timespec *curr_tstamp,
221 struct timespec *audio_tstamp)
223 struct snd_pcm_runtime *runtime = substream->runtime;
224 u64 audio_frames, audio_nsecs;
225 struct timespec driver_tstamp;
227 if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
230 if (!(substream->ops->get_time_info) ||
231 (runtime->audio_tstamp_report.actual_type ==
232 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
235 * provide audio timestamp derived from pointer position
236 * add delay only if requested
239 audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
241 if (runtime->audio_tstamp_config.report_delay) {
242 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
243 audio_frames -= runtime->delay;
245 audio_frames += runtime->delay;
247 audio_nsecs = div_u64(audio_frames * 1000000000LL,
249 *audio_tstamp = ns_to_timespec(audio_nsecs);
251 if (!timespec_equal(&runtime->status->audio_tstamp, audio_tstamp)) {
252 runtime->status->audio_tstamp = *audio_tstamp;
253 runtime->status->tstamp = *curr_tstamp;
257 * re-take a driver timestamp to let apps detect if the reference tstamp
258 * read by low-level hardware was provided with a delay
260 snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);
261 runtime->driver_tstamp = driver_tstamp;
264 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
265 unsigned int in_interrupt)
267 struct snd_pcm_runtime *runtime = substream->runtime;
268 snd_pcm_uframes_t pos;
269 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
270 snd_pcm_sframes_t hdelta, delta;
271 unsigned long jdelta;
272 unsigned long curr_jiffies;
273 struct timespec curr_tstamp;
274 struct timespec audio_tstamp;
275 int crossed_boundary = 0;
277 old_hw_ptr = runtime->status->hw_ptr;
280 * group pointer, time and jiffies reads to allow for more
281 * accurate correlations/corrections.
282 * The values are stored at the end of this routine after
283 * corrections for hw_ptr position
285 pos = substream->ops->pointer(substream);
286 curr_jiffies = jiffies;
287 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
288 if ((substream->ops->get_time_info) &&
289 (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
290 substream->ops->get_time_info(substream, &curr_tstamp,
292 &runtime->audio_tstamp_config,
293 &runtime->audio_tstamp_report);
295 /* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */
296 if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
297 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
299 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
302 if (pos == SNDRV_PCM_POS_XRUN) {
306 if (pos >= runtime->buffer_size) {
307 if (printk_ratelimit()) {
309 snd_pcm_debug_name(substream, name, sizeof(name));
310 pcm_err(substream->pcm,
311 "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
312 name, pos, runtime->buffer_size,
313 runtime->period_size);
317 pos -= pos % runtime->min_align;
318 trace_hwptr(substream, pos, in_interrupt);
319 hw_base = runtime->hw_ptr_base;
320 new_hw_ptr = hw_base + pos;
322 /* we know that one period was processed */
323 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
324 delta = runtime->hw_ptr_interrupt + runtime->period_size;
325 if (delta > new_hw_ptr) {
326 /* check for double acknowledged interrupts */
327 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
328 if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
329 hw_base += runtime->buffer_size;
330 if (hw_base >= runtime->boundary) {
334 new_hw_ptr = hw_base + pos;
339 /* new_hw_ptr might be lower than old_hw_ptr in case when */
340 /* pointer crosses the end of the ring buffer */
341 if (new_hw_ptr < old_hw_ptr) {
342 hw_base += runtime->buffer_size;
343 if (hw_base >= runtime->boundary) {
347 new_hw_ptr = hw_base + pos;
350 delta = new_hw_ptr - old_hw_ptr;
352 delta += runtime->boundary;
354 if (runtime->no_period_wakeup) {
355 snd_pcm_sframes_t xrun_threshold;
357 * Without regular period interrupts, we have to check
358 * the elapsed time to detect xruns.
360 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
361 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
363 hdelta = jdelta - delta * HZ / runtime->rate;
364 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
365 while (hdelta > xrun_threshold) {
366 delta += runtime->buffer_size;
367 hw_base += runtime->buffer_size;
368 if (hw_base >= runtime->boundary) {
372 new_hw_ptr = hw_base + pos;
373 hdelta -= runtime->hw_ptr_buffer_jiffies;
378 /* something must be really wrong */
379 if (delta >= runtime->buffer_size + runtime->period_size) {
380 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
381 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
382 substream->stream, (long)pos,
383 (long)new_hw_ptr, (long)old_hw_ptr);
387 /* Do jiffies check only in xrun_debug mode */
388 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
389 goto no_jiffies_check;
391 /* Skip the jiffies check for hardwares with BATCH flag.
392 * Such hardware usually just increases the position at each IRQ,
393 * thus it can't give any strange position.
395 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
396 goto no_jiffies_check;
398 if (hdelta < runtime->delay)
399 goto no_jiffies_check;
400 hdelta -= runtime->delay;
401 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
402 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
404 (((runtime->period_size * HZ) / runtime->rate)
406 /* move new_hw_ptr according jiffies not pos variable */
407 new_hw_ptr = old_hw_ptr;
409 /* use loop to avoid checks for delta overflows */
410 /* the delta value is small or zero in most cases */
412 new_hw_ptr += runtime->period_size;
413 if (new_hw_ptr >= runtime->boundary) {
414 new_hw_ptr -= runtime->boundary;
419 /* align hw_base to buffer_size */
420 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
421 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
422 (long)pos, (long)hdelta,
423 (long)runtime->period_size, jdelta,
424 ((hdelta * HZ) / runtime->rate), hw_base,
425 (unsigned long)old_hw_ptr,
426 (unsigned long)new_hw_ptr);
427 /* reset values to proper state */
429 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
432 if (delta > runtime->period_size + runtime->period_size / 2) {
433 hw_ptr_error(substream, in_interrupt,
435 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
436 substream->stream, (long)delta,
442 if (runtime->status->hw_ptr == new_hw_ptr) {
443 runtime->hw_ptr_jiffies = curr_jiffies;
444 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
448 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
449 runtime->silence_size > 0)
450 snd_pcm_playback_silence(substream, new_hw_ptr);
453 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
455 delta += runtime->boundary;
456 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
457 runtime->hw_ptr_interrupt += delta;
458 if (runtime->hw_ptr_interrupt >= runtime->boundary)
459 runtime->hw_ptr_interrupt -= runtime->boundary;
461 runtime->hw_ptr_base = hw_base;
462 runtime->status->hw_ptr = new_hw_ptr;
463 runtime->hw_ptr_jiffies = curr_jiffies;
464 if (crossed_boundary) {
465 snd_BUG_ON(crossed_boundary != 1);
466 runtime->hw_ptr_wrap += runtime->boundary;
469 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
471 return snd_pcm_update_state(substream, runtime);
474 /* CAUTION: call it with irq disabled */
475 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
477 return snd_pcm_update_hw_ptr0(substream, 0);
481 * snd_pcm_set_ops - set the PCM operators
482 * @pcm: the pcm instance
483 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
484 * @ops: the operator table
486 * Sets the given PCM operators to the pcm instance.
488 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
489 const struct snd_pcm_ops *ops)
491 struct snd_pcm_str *stream = &pcm->streams[direction];
492 struct snd_pcm_substream *substream;
494 for (substream = stream->substream; substream != NULL; substream = substream->next)
495 substream->ops = ops;
497 EXPORT_SYMBOL(snd_pcm_set_ops);
500 * snd_pcm_sync - set the PCM sync id
501 * @substream: the pcm substream
503 * Sets the PCM sync identifier for the card.
505 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
507 struct snd_pcm_runtime *runtime = substream->runtime;
509 runtime->sync.id32[0] = substream->pcm->card->number;
510 runtime->sync.id32[1] = -1;
511 runtime->sync.id32[2] = -1;
512 runtime->sync.id32[3] = -1;
514 EXPORT_SYMBOL(snd_pcm_set_sync);
517 * Standard ioctl routine
520 static inline unsigned int div32(unsigned int a, unsigned int b,
531 static inline unsigned int div_down(unsigned int a, unsigned int b)
538 static inline unsigned int div_up(unsigned int a, unsigned int b)
550 static inline unsigned int mul(unsigned int a, unsigned int b)
554 if (div_down(UINT_MAX, a) < b)
559 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
560 unsigned int c, unsigned int *r)
562 u_int64_t n = (u_int64_t) a * b;
567 n = div_u64_rem(n, c, r);
576 * snd_interval_refine - refine the interval value of configurator
577 * @i: the interval value to refine
578 * @v: the interval value to refer to
580 * Refines the interval value with the reference value.
581 * The interval is changed to the range satisfying both intervals.
582 * The interval status (min, max, integer, etc.) are evaluated.
584 * Return: Positive if the value is changed, zero if it's not changed, or a
585 * negative error code.
587 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
590 if (snd_BUG_ON(snd_interval_empty(i)))
592 if (i->min < v->min) {
594 i->openmin = v->openmin;
596 } else if (i->min == v->min && !i->openmin && v->openmin) {
600 if (i->max > v->max) {
602 i->openmax = v->openmax;
604 } else if (i->max == v->max && !i->openmax && v->openmax) {
608 if (!i->integer && v->integer) {
621 } else if (!i->openmin && !i->openmax && i->min == i->max)
623 if (snd_interval_checkempty(i)) {
624 snd_interval_none(i);
629 EXPORT_SYMBOL(snd_interval_refine);
631 static int snd_interval_refine_first(struct snd_interval *i)
633 const unsigned int last_max = i->max;
635 if (snd_BUG_ON(snd_interval_empty(i)))
637 if (snd_interval_single(i))
642 /* only exclude max value if also excluded before refine */
643 i->openmax = (i->openmax && i->max >= last_max);
647 static int snd_interval_refine_last(struct snd_interval *i)
649 const unsigned int last_min = i->min;
651 if (snd_BUG_ON(snd_interval_empty(i)))
653 if (snd_interval_single(i))
658 /* only exclude min value if also excluded before refine */
659 i->openmin = (i->openmin && i->min <= last_min);
663 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
665 if (a->empty || b->empty) {
666 snd_interval_none(c);
670 c->min = mul(a->min, b->min);
671 c->openmin = (a->openmin || b->openmin);
672 c->max = mul(a->max, b->max);
673 c->openmax = (a->openmax || b->openmax);
674 c->integer = (a->integer && b->integer);
678 * snd_interval_div - refine the interval value with division
685 * Returns non-zero if the value is changed, zero if not changed.
687 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
690 if (a->empty || b->empty) {
691 snd_interval_none(c);
695 c->min = div32(a->min, b->max, &r);
696 c->openmin = (r || a->openmin || b->openmax);
698 c->max = div32(a->max, b->min, &r);
703 c->openmax = (a->openmax || b->openmin);
712 * snd_interval_muldivk - refine the interval value
715 * @k: divisor (as integer)
720 * Returns non-zero if the value is changed, zero if not changed.
722 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
723 unsigned int k, struct snd_interval *c)
726 if (a->empty || b->empty) {
727 snd_interval_none(c);
731 c->min = muldiv32(a->min, b->min, k, &r);
732 c->openmin = (r || a->openmin || b->openmin);
733 c->max = muldiv32(a->max, b->max, k, &r);
738 c->openmax = (a->openmax || b->openmax);
743 * snd_interval_mulkdiv - refine the interval value
745 * @k: dividend 2 (as integer)
751 * Returns non-zero if the value is changed, zero if not changed.
753 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
754 const struct snd_interval *b, struct snd_interval *c)
757 if (a->empty || b->empty) {
758 snd_interval_none(c);
762 c->min = muldiv32(a->min, k, b->max, &r);
763 c->openmin = (r || a->openmin || b->openmax);
765 c->max = muldiv32(a->max, k, b->min, &r);
770 c->openmax = (a->openmax || b->openmin);
782 * snd_interval_ratnum - refine the interval value
783 * @i: interval to refine
784 * @rats_count: number of ratnum_t
785 * @rats: ratnum_t array
786 * @nump: pointer to store the resultant numerator
787 * @denp: pointer to store the resultant denominator
789 * Return: Positive if the value is changed, zero if it's not changed, or a
790 * negative error code.
792 int snd_interval_ratnum(struct snd_interval *i,
793 unsigned int rats_count, const struct snd_ratnum *rats,
794 unsigned int *nump, unsigned int *denp)
796 unsigned int best_num, best_den;
799 struct snd_interval t;
801 unsigned int result_num, result_den;
804 best_num = best_den = best_diff = 0;
805 for (k = 0; k < rats_count; ++k) {
806 unsigned int num = rats[k].num;
808 unsigned int q = i->min;
812 den = div_up(num, q);
813 if (den < rats[k].den_min)
815 if (den > rats[k].den_max)
816 den = rats[k].den_max;
819 r = (den - rats[k].den_min) % rats[k].den_step;
823 diff = num - q * den;
827 diff * best_den < best_diff * den) {
837 t.min = div_down(best_num, best_den);
838 t.openmin = !!(best_num % best_den);
840 result_num = best_num;
841 result_diff = best_diff;
842 result_den = best_den;
843 best_num = best_den = best_diff = 0;
844 for (k = 0; k < rats_count; ++k) {
845 unsigned int num = rats[k].num;
847 unsigned int q = i->max;
853 den = div_down(num, q);
854 if (den > rats[k].den_max)
856 if (den < rats[k].den_min)
857 den = rats[k].den_min;
860 r = (den - rats[k].den_min) % rats[k].den_step;
862 den += rats[k].den_step - r;
864 diff = q * den - num;
868 diff * best_den < best_diff * den) {
878 t.max = div_up(best_num, best_den);
879 t.openmax = !!(best_num % best_den);
881 err = snd_interval_refine(i, &t);
885 if (snd_interval_single(i)) {
886 if (best_diff * result_den < result_diff * best_den) {
887 result_num = best_num;
888 result_den = best_den;
897 EXPORT_SYMBOL(snd_interval_ratnum);
900 * snd_interval_ratden - refine the interval value
901 * @i: interval to refine
902 * @rats_count: number of struct ratden
903 * @rats: struct ratden array
904 * @nump: pointer to store the resultant numerator
905 * @denp: pointer to store the resultant denominator
907 * Return: Positive if the value is changed, zero if it's not changed, or a
908 * negative error code.
910 static int snd_interval_ratden(struct snd_interval *i,
911 unsigned int rats_count,
912 const struct snd_ratden *rats,
913 unsigned int *nump, unsigned int *denp)
915 unsigned int best_num, best_diff, best_den;
917 struct snd_interval t;
920 best_num = best_den = best_diff = 0;
921 for (k = 0; k < rats_count; ++k) {
923 unsigned int den = rats[k].den;
924 unsigned int q = i->min;
927 if (num > rats[k].num_max)
929 if (num < rats[k].num_min)
930 num = rats[k].num_max;
933 r = (num - rats[k].num_min) % rats[k].num_step;
935 num += rats[k].num_step - r;
937 diff = num - q * den;
939 diff * best_den < best_diff * den) {
949 t.min = div_down(best_num, best_den);
950 t.openmin = !!(best_num % best_den);
952 best_num = best_den = best_diff = 0;
953 for (k = 0; k < rats_count; ++k) {
955 unsigned int den = rats[k].den;
956 unsigned int q = i->max;
959 if (num < rats[k].num_min)
961 if (num > rats[k].num_max)
962 num = rats[k].num_max;
965 r = (num - rats[k].num_min) % rats[k].num_step;
969 diff = q * den - num;
971 diff * best_den < best_diff * den) {
981 t.max = div_up(best_num, best_den);
982 t.openmax = !!(best_num % best_den);
984 err = snd_interval_refine(i, &t);
988 if (snd_interval_single(i)) {
998 * snd_interval_list - refine the interval value from the list
999 * @i: the interval value to refine
1000 * @count: the number of elements in the list
1001 * @list: the value list
1002 * @mask: the bit-mask to evaluate
1004 * Refines the interval value from the list.
1005 * When mask is non-zero, only the elements corresponding to bit 1 are
1008 * Return: Positive if the value is changed, zero if it's not changed, or a
1009 * negative error code.
1011 int snd_interval_list(struct snd_interval *i, unsigned int count,
1012 const unsigned int *list, unsigned int mask)
1015 struct snd_interval list_range;
1021 snd_interval_any(&list_range);
1022 list_range.min = UINT_MAX;
1024 for (k = 0; k < count; k++) {
1025 if (mask && !(mask & (1 << k)))
1027 if (!snd_interval_test(i, list[k]))
1029 list_range.min = min(list_range.min, list[k]);
1030 list_range.max = max(list_range.max, list[k]);
1032 return snd_interval_refine(i, &list_range);
1034 EXPORT_SYMBOL(snd_interval_list);
1037 * snd_interval_ranges - refine the interval value from the list of ranges
1038 * @i: the interval value to refine
1039 * @count: the number of elements in the list of ranges
1040 * @ranges: the ranges list
1041 * @mask: the bit-mask to evaluate
1043 * Refines the interval value from the list of ranges.
1044 * When mask is non-zero, only the elements corresponding to bit 1 are
1047 * Return: Positive if the value is changed, zero if it's not changed, or a
1048 * negative error code.
1050 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1051 const struct snd_interval *ranges, unsigned int mask)
1054 struct snd_interval range_union;
1055 struct snd_interval range;
1058 snd_interval_none(i);
1061 snd_interval_any(&range_union);
1062 range_union.min = UINT_MAX;
1063 range_union.max = 0;
1064 for (k = 0; k < count; k++) {
1065 if (mask && !(mask & (1 << k)))
1067 snd_interval_copy(&range, &ranges[k]);
1068 if (snd_interval_refine(&range, i) < 0)
1070 if (snd_interval_empty(&range))
1073 if (range.min < range_union.min) {
1074 range_union.min = range.min;
1075 range_union.openmin = 1;
1077 if (range.min == range_union.min && !range.openmin)
1078 range_union.openmin = 0;
1079 if (range.max > range_union.max) {
1080 range_union.max = range.max;
1081 range_union.openmax = 1;
1083 if (range.max == range_union.max && !range.openmax)
1084 range_union.openmax = 0;
1086 return snd_interval_refine(i, &range_union);
1088 EXPORT_SYMBOL(snd_interval_ranges);
1090 static int snd_interval_step(struct snd_interval *i, unsigned int step)
1095 if (n != 0 || i->openmin) {
1101 if (n != 0 || i->openmax) {
1106 if (snd_interval_checkempty(i)) {
1113 /* Info constraints helpers */
1116 * snd_pcm_hw_rule_add - add the hw-constraint rule
1117 * @runtime: the pcm runtime instance
1118 * @cond: condition bits
1119 * @var: the variable to evaluate
1120 * @func: the evaluation function
1121 * @private: the private data pointer passed to function
1122 * @dep: the dependent variables
1124 * Return: Zero if successful, or a negative error code on failure.
1126 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1128 snd_pcm_hw_rule_func_t func, void *private,
1131 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1132 struct snd_pcm_hw_rule *c;
1135 va_start(args, dep);
1136 if (constrs->rules_num >= constrs->rules_all) {
1137 struct snd_pcm_hw_rule *new;
1138 unsigned int new_rules = constrs->rules_all + 16;
1139 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1144 if (constrs->rules) {
1145 memcpy(new, constrs->rules,
1146 constrs->rules_num * sizeof(*c));
1147 kfree(constrs->rules);
1149 constrs->rules = new;
1150 constrs->rules_all = new_rules;
1152 c = &constrs->rules[constrs->rules_num];
1156 c->private = private;
1159 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1166 dep = va_arg(args, int);
1168 constrs->rules_num++;
1172 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1175 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1176 * @runtime: PCM runtime instance
1177 * @var: hw_params variable to apply the mask
1178 * @mask: the bitmap mask
1180 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1182 * Return: Zero if successful, or a negative error code on failure.
1184 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1187 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1188 struct snd_mask *maskp = constrs_mask(constrs, var);
1189 *maskp->bits &= mask;
1190 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1191 if (*maskp->bits == 0)
1197 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1198 * @runtime: PCM runtime instance
1199 * @var: hw_params variable to apply the mask
1200 * @mask: the 64bit bitmap mask
1202 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1204 * Return: Zero if successful, or a negative error code on failure.
1206 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1209 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1210 struct snd_mask *maskp = constrs_mask(constrs, var);
1211 maskp->bits[0] &= (u_int32_t)mask;
1212 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1213 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1214 if (! maskp->bits[0] && ! maskp->bits[1])
1218 EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1221 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1222 * @runtime: PCM runtime instance
1223 * @var: hw_params variable to apply the integer constraint
1225 * Apply the constraint of integer to an interval parameter.
1227 * Return: Positive if the value is changed, zero if it's not changed, or a
1228 * negative error code.
1230 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1232 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1233 return snd_interval_setinteger(constrs_interval(constrs, var));
1235 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1238 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1239 * @runtime: PCM runtime instance
1240 * @var: hw_params variable to apply the range
1241 * @min: the minimal value
1242 * @max: the maximal value
1244 * Apply the min/max range constraint to an interval parameter.
1246 * Return: Positive if the value is changed, zero if it's not changed, or a
1247 * negative error code.
1249 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1250 unsigned int min, unsigned int max)
1252 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1253 struct snd_interval t;
1256 t.openmin = t.openmax = 0;
1258 return snd_interval_refine(constrs_interval(constrs, var), &t);
1260 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1262 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1263 struct snd_pcm_hw_rule *rule)
1265 struct snd_pcm_hw_constraint_list *list = rule->private;
1266 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1271 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1272 * @runtime: PCM runtime instance
1273 * @cond: condition bits
1274 * @var: hw_params variable to apply the list constraint
1277 * Apply the list of constraints to an interval parameter.
1279 * Return: Zero if successful, or a negative error code on failure.
1281 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1283 snd_pcm_hw_param_t var,
1284 const struct snd_pcm_hw_constraint_list *l)
1286 return snd_pcm_hw_rule_add(runtime, cond, var,
1287 snd_pcm_hw_rule_list, (void *)l,
1290 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1292 static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
1293 struct snd_pcm_hw_rule *rule)
1295 struct snd_pcm_hw_constraint_ranges *r = rule->private;
1296 return snd_interval_ranges(hw_param_interval(params, rule->var),
1297 r->count, r->ranges, r->mask);
1302 * snd_pcm_hw_constraint_ranges - apply list of range constraints to a parameter
1303 * @runtime: PCM runtime instance
1304 * @cond: condition bits
1305 * @var: hw_params variable to apply the list of range constraints
1308 * Apply the list of range constraints to an interval parameter.
1310 * Return: Zero if successful, or a negative error code on failure.
1312 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1314 snd_pcm_hw_param_t var,
1315 const struct snd_pcm_hw_constraint_ranges *r)
1317 return snd_pcm_hw_rule_add(runtime, cond, var,
1318 snd_pcm_hw_rule_ranges, (void *)r,
1321 EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
1323 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1324 struct snd_pcm_hw_rule *rule)
1326 const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1327 unsigned int num = 0, den = 0;
1329 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1330 r->nrats, r->rats, &num, &den);
1331 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1332 params->rate_num = num;
1333 params->rate_den = den;
1339 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1340 * @runtime: PCM runtime instance
1341 * @cond: condition bits
1342 * @var: hw_params variable to apply the ratnums constraint
1343 * @r: struct snd_ratnums constriants
1345 * Return: Zero if successful, or a negative error code on failure.
1347 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1349 snd_pcm_hw_param_t var,
1350 const struct snd_pcm_hw_constraint_ratnums *r)
1352 return snd_pcm_hw_rule_add(runtime, cond, var,
1353 snd_pcm_hw_rule_ratnums, (void *)r,
1356 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1358 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1359 struct snd_pcm_hw_rule *rule)
1361 const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1362 unsigned int num = 0, den = 0;
1363 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1364 r->nrats, r->rats, &num, &den);
1365 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1366 params->rate_num = num;
1367 params->rate_den = den;
1373 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1374 * @runtime: PCM runtime instance
1375 * @cond: condition bits
1376 * @var: hw_params variable to apply the ratdens constraint
1377 * @r: struct snd_ratdens constriants
1379 * Return: Zero if successful, or a negative error code on failure.
1381 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1383 snd_pcm_hw_param_t var,
1384 const struct snd_pcm_hw_constraint_ratdens *r)
1386 return snd_pcm_hw_rule_add(runtime, cond, var,
1387 snd_pcm_hw_rule_ratdens, (void *)r,
1390 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1392 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1393 struct snd_pcm_hw_rule *rule)
1395 unsigned int l = (unsigned long) rule->private;
1396 int width = l & 0xffff;
1397 unsigned int msbits = l >> 16;
1398 const struct snd_interval *i =
1399 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1401 if (!snd_interval_single(i))
1404 if ((snd_interval_value(i) == width) ||
1405 (width == 0 && snd_interval_value(i) > msbits))
1406 params->msbits = min_not_zero(params->msbits, msbits);
1412 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1413 * @runtime: PCM runtime instance
1414 * @cond: condition bits
1415 * @width: sample bits width
1416 * @msbits: msbits width
1418 * This constraint will set the number of most significant bits (msbits) if a
1419 * sample format with the specified width has been select. If width is set to 0
1420 * the msbits will be set for any sample format with a width larger than the
1423 * Return: Zero if successful, or a negative error code on failure.
1425 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1428 unsigned int msbits)
1430 unsigned long l = (msbits << 16) | width;
1431 return snd_pcm_hw_rule_add(runtime, cond, -1,
1432 snd_pcm_hw_rule_msbits,
1434 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1436 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1438 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1439 struct snd_pcm_hw_rule *rule)
1441 unsigned long step = (unsigned long) rule->private;
1442 return snd_interval_step(hw_param_interval(params, rule->var), step);
1446 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1447 * @runtime: PCM runtime instance
1448 * @cond: condition bits
1449 * @var: hw_params variable to apply the step constraint
1452 * Return: Zero if successful, or a negative error code on failure.
1454 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1456 snd_pcm_hw_param_t var,
1459 return snd_pcm_hw_rule_add(runtime, cond, var,
1460 snd_pcm_hw_rule_step, (void *) step,
1463 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1465 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1467 static unsigned int pow2_sizes[] = {
1468 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1469 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1470 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1471 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1473 return snd_interval_list(hw_param_interval(params, rule->var),
1474 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1478 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1479 * @runtime: PCM runtime instance
1480 * @cond: condition bits
1481 * @var: hw_params variable to apply the power-of-2 constraint
1483 * Return: Zero if successful, or a negative error code on failure.
1485 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1487 snd_pcm_hw_param_t var)
1489 return snd_pcm_hw_rule_add(runtime, cond, var,
1490 snd_pcm_hw_rule_pow2, NULL,
1493 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1495 static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1496 struct snd_pcm_hw_rule *rule)
1498 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1499 struct snd_interval *rate;
1501 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1502 return snd_interval_list(rate, 1, &base_rate, 0);
1506 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1507 * @runtime: PCM runtime instance
1508 * @base_rate: the rate at which the hardware does not resample
1510 * Return: Zero if successful, or a negative error code on failure.
1512 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1513 unsigned int base_rate)
1515 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1516 SNDRV_PCM_HW_PARAM_RATE,
1517 snd_pcm_hw_rule_noresample_func,
1518 (void *)(uintptr_t)base_rate,
1519 SNDRV_PCM_HW_PARAM_RATE, -1);
1521 EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1523 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1524 snd_pcm_hw_param_t var)
1526 if (hw_is_mask(var)) {
1527 snd_mask_any(hw_param_mask(params, var));
1528 params->cmask |= 1 << var;
1529 params->rmask |= 1 << var;
1532 if (hw_is_interval(var)) {
1533 snd_interval_any(hw_param_interval(params, var));
1534 params->cmask |= 1 << var;
1535 params->rmask |= 1 << var;
1541 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1544 memset(params, 0, sizeof(*params));
1545 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1546 _snd_pcm_hw_param_any(params, k);
1547 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1548 _snd_pcm_hw_param_any(params, k);
1551 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1554 * snd_pcm_hw_param_value - return @params field @var value
1555 * @params: the hw_params instance
1556 * @var: parameter to retrieve
1557 * @dir: pointer to the direction (-1,0,1) or %NULL
1559 * Return: The value for field @var if it's fixed in configuration space
1560 * defined by @params. -%EINVAL otherwise.
1562 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1563 snd_pcm_hw_param_t var, int *dir)
1565 if (hw_is_mask(var)) {
1566 const struct snd_mask *mask = hw_param_mask_c(params, var);
1567 if (!snd_mask_single(mask))
1571 return snd_mask_value(mask);
1573 if (hw_is_interval(var)) {
1574 const struct snd_interval *i = hw_param_interval_c(params, var);
1575 if (!snd_interval_single(i))
1579 return snd_interval_value(i);
1583 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1585 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1586 snd_pcm_hw_param_t var)
1588 if (hw_is_mask(var)) {
1589 snd_mask_none(hw_param_mask(params, var));
1590 params->cmask |= 1 << var;
1591 params->rmask |= 1 << var;
1592 } else if (hw_is_interval(var)) {
1593 snd_interval_none(hw_param_interval(params, var));
1594 params->cmask |= 1 << var;
1595 params->rmask |= 1 << var;
1600 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1602 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1603 snd_pcm_hw_param_t var)
1606 if (hw_is_mask(var))
1607 changed = snd_mask_refine_first(hw_param_mask(params, var));
1608 else if (hw_is_interval(var))
1609 changed = snd_interval_refine_first(hw_param_interval(params, var));
1613 params->cmask |= 1 << var;
1614 params->rmask |= 1 << var;
1621 * snd_pcm_hw_param_first - refine config space and return minimum value
1622 * @pcm: PCM instance
1623 * @params: the hw_params instance
1624 * @var: parameter to retrieve
1625 * @dir: pointer to the direction (-1,0,1) or %NULL
1627 * Inside configuration space defined by @params remove from @var all
1628 * values > minimum. Reduce configuration space accordingly.
1630 * Return: The minimum, or a negative error code on failure.
1632 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1633 struct snd_pcm_hw_params *params,
1634 snd_pcm_hw_param_t var, int *dir)
1636 int changed = _snd_pcm_hw_param_first(params, var);
1639 if (params->rmask) {
1640 int err = snd_pcm_hw_refine(pcm, params);
1644 return snd_pcm_hw_param_value(params, var, dir);
1646 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1648 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1649 snd_pcm_hw_param_t var)
1652 if (hw_is_mask(var))
1653 changed = snd_mask_refine_last(hw_param_mask(params, var));
1654 else if (hw_is_interval(var))
1655 changed = snd_interval_refine_last(hw_param_interval(params, var));
1659 params->cmask |= 1 << var;
1660 params->rmask |= 1 << var;
1667 * snd_pcm_hw_param_last - refine config space and return maximum value
1668 * @pcm: PCM instance
1669 * @params: the hw_params instance
1670 * @var: parameter to retrieve
1671 * @dir: pointer to the direction (-1,0,1) or %NULL
1673 * Inside configuration space defined by @params remove from @var all
1674 * values < maximum. Reduce configuration space accordingly.
1676 * Return: The maximum, or a negative error code on failure.
1678 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1679 struct snd_pcm_hw_params *params,
1680 snd_pcm_hw_param_t var, int *dir)
1682 int changed = _snd_pcm_hw_param_last(params, var);
1685 if (params->rmask) {
1686 int err = snd_pcm_hw_refine(pcm, params);
1690 return snd_pcm_hw_param_value(params, var, dir);
1692 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1694 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1697 struct snd_pcm_runtime *runtime = substream->runtime;
1698 unsigned long flags;
1699 snd_pcm_stream_lock_irqsave(substream, flags);
1700 if (snd_pcm_running(substream) &&
1701 snd_pcm_update_hw_ptr(substream) >= 0)
1702 runtime->status->hw_ptr %= runtime->buffer_size;
1704 runtime->status->hw_ptr = 0;
1705 runtime->hw_ptr_wrap = 0;
1707 snd_pcm_stream_unlock_irqrestore(substream, flags);
1711 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1714 struct snd_pcm_channel_info *info = arg;
1715 struct snd_pcm_runtime *runtime = substream->runtime;
1717 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1721 width = snd_pcm_format_physical_width(runtime->format);
1725 switch (runtime->access) {
1726 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1727 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1728 info->first = info->channel * width;
1729 info->step = runtime->channels * width;
1731 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1732 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1734 size_t size = runtime->dma_bytes / runtime->channels;
1735 info->first = info->channel * size * 8;
1746 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1749 struct snd_pcm_hw_params *params = arg;
1750 snd_pcm_format_t format;
1754 params->fifo_size = substream->runtime->hw.fifo_size;
1755 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1756 format = params_format(params);
1757 channels = params_channels(params);
1758 frame_size = snd_pcm_format_size(format, channels);
1760 params->fifo_size /= frame_size;
1766 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1767 * @substream: the pcm substream instance
1768 * @cmd: ioctl command
1769 * @arg: ioctl argument
1771 * Processes the generic ioctl commands for PCM.
1772 * Can be passed as the ioctl callback for PCM ops.
1774 * Return: Zero if successful, or a negative error code on failure.
1776 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1777 unsigned int cmd, void *arg)
1780 case SNDRV_PCM_IOCTL1_RESET:
1781 return snd_pcm_lib_ioctl_reset(substream, arg);
1782 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1783 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1784 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1785 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1789 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1792 * snd_pcm_period_elapsed - update the pcm status for the next period
1793 * @substream: the pcm substream instance
1795 * This function is called from the interrupt handler when the
1796 * PCM has processed the period size. It will update the current
1797 * pointer, wake up sleepers, etc.
1799 * Even if more than one periods have elapsed since the last call, you
1800 * have to call this only once.
1802 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1804 struct snd_pcm_runtime *runtime;
1805 unsigned long flags;
1807 if (snd_BUG_ON(!substream))
1810 snd_pcm_stream_lock_irqsave(substream, flags);
1811 if (PCM_RUNTIME_CHECK(substream))
1813 runtime = substream->runtime;
1815 if (!snd_pcm_running(substream) ||
1816 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1819 #ifdef CONFIG_SND_PCM_TIMER
1820 if (substream->timer_running)
1821 snd_timer_interrupt(substream->timer, 1);
1824 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1826 snd_pcm_stream_unlock_irqrestore(substream, flags);
1828 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1831 * Wait until avail_min data becomes available
1832 * Returns a negative error code if any error occurs during operation.
1833 * The available space is stored on availp. When err = 0 and avail = 0
1834 * on the capture stream, it indicates the stream is in DRAINING state.
1836 static int wait_for_avail(struct snd_pcm_substream *substream,
1837 snd_pcm_uframes_t *availp)
1839 struct snd_pcm_runtime *runtime = substream->runtime;
1840 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1841 wait_queue_entry_t wait;
1843 snd_pcm_uframes_t avail = 0;
1844 long wait_time, tout;
1846 init_waitqueue_entry(&wait, current);
1847 set_current_state(TASK_INTERRUPTIBLE);
1848 add_wait_queue(&runtime->tsleep, &wait);
1850 if (runtime->no_period_wakeup)
1851 wait_time = MAX_SCHEDULE_TIMEOUT;
1854 if (runtime->rate) {
1855 long t = runtime->period_size * 2 / runtime->rate;
1856 wait_time = max(t, wait_time);
1858 wait_time = msecs_to_jiffies(wait_time * 1000);
1862 if (signal_pending(current)) {
1868 * We need to check if space became available already
1869 * (and thus the wakeup happened already) first to close
1870 * the race of space already having become available.
1871 * This check must happen after been added to the waitqueue
1872 * and having current state be INTERRUPTIBLE.
1875 avail = snd_pcm_playback_avail(runtime);
1877 avail = snd_pcm_capture_avail(runtime);
1878 if (avail >= runtime->twake)
1880 snd_pcm_stream_unlock_irq(substream);
1882 tout = schedule_timeout(wait_time);
1884 snd_pcm_stream_lock_irq(substream);
1885 set_current_state(TASK_INTERRUPTIBLE);
1886 switch (runtime->status->state) {
1887 case SNDRV_PCM_STATE_SUSPENDED:
1890 case SNDRV_PCM_STATE_XRUN:
1893 case SNDRV_PCM_STATE_DRAINING:
1897 avail = 0; /* indicate draining */
1899 case SNDRV_PCM_STATE_OPEN:
1900 case SNDRV_PCM_STATE_SETUP:
1901 case SNDRV_PCM_STATE_DISCONNECTED:
1904 case SNDRV_PCM_STATE_PAUSED:
1908 pcm_dbg(substream->pcm,
1909 "%s write error (DMA or IRQ trouble?)\n",
1910 is_playback ? "playback" : "capture");
1916 set_current_state(TASK_RUNNING);
1917 remove_wait_queue(&runtime->tsleep, &wait);
1922 typedef int (*pcm_transfer_f)(struct snd_pcm_substream *substream,
1923 int channel, unsigned long hwoff,
1924 void *buf, unsigned long bytes);
1926 typedef int (*pcm_copy_f)(struct snd_pcm_substream *, snd_pcm_uframes_t, void *,
1927 snd_pcm_uframes_t, snd_pcm_uframes_t, pcm_transfer_f);
1929 /* calculate the target DMA-buffer position to be written/read */
1930 static void *get_dma_ptr(struct snd_pcm_runtime *runtime,
1931 int channel, unsigned long hwoff)
1933 return runtime->dma_area + hwoff +
1934 channel * (runtime->dma_bytes / runtime->channels);
1937 /* default copy_user ops for write; used for both interleaved and non- modes */
1938 static int default_write_copy(struct snd_pcm_substream *substream,
1939 int channel, unsigned long hwoff,
1940 void *buf, unsigned long bytes)
1942 if (copy_from_user(get_dma_ptr(substream->runtime, channel, hwoff),
1943 (void __user *)buf, bytes))
1948 /* default copy_kernel ops for write */
1949 static int default_write_copy_kernel(struct snd_pcm_substream *substream,
1950 int channel, unsigned long hwoff,
1951 void *buf, unsigned long bytes)
1953 memcpy(get_dma_ptr(substream->runtime, channel, hwoff), buf, bytes);
1957 /* fill silence instead of copy data; called as a transfer helper
1958 * from __snd_pcm_lib_write() or directly from noninterleaved_copy() when
1959 * a NULL buffer is passed
1961 static int fill_silence(struct snd_pcm_substream *substream, int channel,
1962 unsigned long hwoff, void *buf, unsigned long bytes)
1964 struct snd_pcm_runtime *runtime = substream->runtime;
1966 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
1968 if (substream->ops->fill_silence)
1969 return substream->ops->fill_silence(substream, channel,
1972 snd_pcm_format_set_silence(runtime->format,
1973 get_dma_ptr(runtime, channel, hwoff),
1974 bytes_to_samples(runtime, bytes));
1978 /* default copy_user ops for read; used for both interleaved and non- modes */
1979 static int default_read_copy(struct snd_pcm_substream *substream,
1980 int channel, unsigned long hwoff,
1981 void *buf, unsigned long bytes)
1983 if (copy_to_user((void __user *)buf,
1984 get_dma_ptr(substream->runtime, channel, hwoff),
1990 /* default copy_kernel ops for read */
1991 static int default_read_copy_kernel(struct snd_pcm_substream *substream,
1992 int channel, unsigned long hwoff,
1993 void *buf, unsigned long bytes)
1995 memcpy(buf, get_dma_ptr(substream->runtime, channel, hwoff), bytes);
1999 /* call transfer function with the converted pointers and sizes;
2000 * for interleaved mode, it's one shot for all samples
2002 static int interleaved_copy(struct snd_pcm_substream *substream,
2003 snd_pcm_uframes_t hwoff, void *data,
2004 snd_pcm_uframes_t off,
2005 snd_pcm_uframes_t frames,
2006 pcm_transfer_f transfer)
2008 struct snd_pcm_runtime *runtime = substream->runtime;
2010 /* convert to bytes */
2011 hwoff = frames_to_bytes(runtime, hwoff);
2012 off = frames_to_bytes(runtime, off);
2013 frames = frames_to_bytes(runtime, frames);
2014 return transfer(substream, 0, hwoff, data + off, frames);
2017 /* call transfer function with the converted pointers and sizes for each
2018 * non-interleaved channel; when buffer is NULL, silencing instead of copying
2020 static int noninterleaved_copy(struct snd_pcm_substream *substream,
2021 snd_pcm_uframes_t hwoff, void *data,
2022 snd_pcm_uframes_t off,
2023 snd_pcm_uframes_t frames,
2024 pcm_transfer_f transfer)
2026 struct snd_pcm_runtime *runtime = substream->runtime;
2027 int channels = runtime->channels;
2031 /* convert to bytes; note that it's not frames_to_bytes() here.
2032 * in non-interleaved mode, we copy for each channel, thus
2033 * each copy is n_samples bytes x channels = whole frames.
2035 off = samples_to_bytes(runtime, off);
2036 frames = samples_to_bytes(runtime, frames);
2037 hwoff = samples_to_bytes(runtime, hwoff);
2038 for (c = 0; c < channels; ++c, ++bufs) {
2039 if (!data || !*bufs)
2040 err = fill_silence(substream, c, hwoff, NULL, frames);
2042 err = transfer(substream, c, hwoff, *bufs + off,
2050 /* fill silence on the given buffer position;
2051 * called from snd_pcm_playback_silence()
2053 static int fill_silence_frames(struct snd_pcm_substream *substream,
2054 snd_pcm_uframes_t off, snd_pcm_uframes_t frames)
2056 if (substream->runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
2057 substream->runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)
2058 return interleaved_copy(substream, off, NULL, 0, frames,
2061 return noninterleaved_copy(substream, off, NULL, 0, frames,
2065 /* sanity-check for read/write methods */
2066 static int pcm_sanity_check(struct snd_pcm_substream *substream)
2068 struct snd_pcm_runtime *runtime;
2069 if (PCM_RUNTIME_CHECK(substream))
2071 runtime = substream->runtime;
2072 if (snd_BUG_ON(!substream->ops->copy_user && !runtime->dma_area))
2074 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2079 static int pcm_accessible_state(struct snd_pcm_runtime *runtime)
2081 switch (runtime->status->state) {
2082 case SNDRV_PCM_STATE_PREPARED:
2083 case SNDRV_PCM_STATE_RUNNING:
2084 case SNDRV_PCM_STATE_PAUSED:
2086 case SNDRV_PCM_STATE_XRUN:
2088 case SNDRV_PCM_STATE_SUSPENDED:
2095 /* update to the given appl_ptr and call ack callback if needed;
2096 * when an error is returned, take back to the original value
2098 int pcm_lib_apply_appl_ptr(struct snd_pcm_substream *substream,
2099 snd_pcm_uframes_t appl_ptr)
2101 struct snd_pcm_runtime *runtime = substream->runtime;
2102 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
2105 if (old_appl_ptr == appl_ptr)
2108 runtime->control->appl_ptr = appl_ptr;
2109 if (substream->ops->ack) {
2110 ret = substream->ops->ack(substream);
2112 runtime->control->appl_ptr = old_appl_ptr;
2117 trace_applptr(substream, old_appl_ptr, appl_ptr);
2122 /* the common loop for read/write data */
2123 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
2124 void *data, bool interleaved,
2125 snd_pcm_uframes_t size, bool in_kernel)
2127 struct snd_pcm_runtime *runtime = substream->runtime;
2128 snd_pcm_uframes_t xfer = 0;
2129 snd_pcm_uframes_t offset = 0;
2130 snd_pcm_uframes_t avail;
2132 pcm_transfer_f transfer;
2137 err = pcm_sanity_check(substream);
2141 is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
2143 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2144 runtime->channels > 1)
2146 writer = interleaved_copy;
2148 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2150 writer = noninterleaved_copy;
2155 transfer = fill_silence;
2158 } else if (in_kernel) {
2159 if (substream->ops->copy_kernel)
2160 transfer = substream->ops->copy_kernel;
2162 transfer = is_playback ?
2163 default_write_copy_kernel : default_read_copy_kernel;
2165 if (substream->ops->copy_user)
2166 transfer = (pcm_transfer_f)substream->ops->copy_user;
2168 transfer = is_playback ?
2169 default_write_copy : default_read_copy;
2175 nonblock = !!(substream->f_flags & O_NONBLOCK);
2177 snd_pcm_stream_lock_irq(substream);
2178 err = pcm_accessible_state(runtime);
2183 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2184 size >= runtime->start_threshold) {
2185 err = snd_pcm_start(substream);
2190 runtime->twake = runtime->control->avail_min ? : 1;
2191 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2192 snd_pcm_update_hw_ptr(substream);
2194 avail = snd_pcm_playback_avail(runtime);
2196 avail = snd_pcm_capture_avail(runtime);
2198 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2199 snd_pcm_uframes_t cont;
2202 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2203 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2210 runtime->twake = min_t(snd_pcm_uframes_t, size,
2211 runtime->control->avail_min ? : 1);
2212 err = wait_for_avail(substream, &avail);
2216 continue; /* draining */
2218 frames = size > avail ? avail : size;
2219 appl_ptr = READ_ONCE(runtime->control->appl_ptr);
2220 appl_ofs = appl_ptr % runtime->buffer_size;
2221 cont = runtime->buffer_size - appl_ofs;
2224 if (snd_BUG_ON(!frames)) {
2226 snd_pcm_stream_unlock_irq(substream);
2229 if (!atomic_inc_unless_negative(&runtime->buffer_accessing)) {
2233 snd_pcm_stream_unlock_irq(substream);
2234 err = writer(substream, appl_ofs, data, offset, frames,
2236 snd_pcm_stream_lock_irq(substream);
2237 atomic_dec(&runtime->buffer_accessing);
2240 err = pcm_accessible_state(runtime);
2244 if (appl_ptr >= runtime->boundary)
2245 appl_ptr -= runtime->boundary;
2246 err = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2255 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2256 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2257 err = snd_pcm_start(substream);
2264 if (xfer > 0 && err >= 0)
2265 snd_pcm_update_state(substream, runtime);
2266 snd_pcm_stream_unlock_irq(substream);
2267 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2269 EXPORT_SYMBOL(__snd_pcm_lib_xfer);
2272 * standard channel mapping helpers
2275 /* default channel maps for multi-channel playbacks, up to 8 channels */
2276 const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2278 .map = { SNDRV_CHMAP_MONO } },
2280 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2282 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2283 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2285 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2286 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2287 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2289 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2290 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2291 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2292 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2295 EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2297 /* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2298 const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2300 .map = { SNDRV_CHMAP_MONO } },
2302 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2304 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2305 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2307 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2308 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2309 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2311 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2312 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2313 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2314 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2317 EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2319 static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2321 if (ch > info->max_channels)
2323 return !info->channel_mask || (info->channel_mask & (1U << ch));
2326 static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2327 struct snd_ctl_elem_info *uinfo)
2329 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2331 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2333 uinfo->count = info->max_channels;
2334 uinfo->value.integer.min = 0;
2335 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2339 /* get callback for channel map ctl element
2340 * stores the channel position firstly matching with the current channels
2342 static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2343 struct snd_ctl_elem_value *ucontrol)
2345 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2346 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2347 struct snd_pcm_substream *substream;
2348 const struct snd_pcm_chmap_elem *map;
2352 substream = snd_pcm_chmap_substream(info, idx);
2355 memset(ucontrol->value.integer.value, 0,
2356 sizeof(ucontrol->value.integer.value));
2357 if (!substream->runtime)
2358 return 0; /* no channels set */
2359 for (map = info->chmap; map->channels; map++) {
2361 if (map->channels == substream->runtime->channels &&
2362 valid_chmap_channels(info, map->channels)) {
2363 for (i = 0; i < map->channels; i++)
2364 ucontrol->value.integer.value[i] = map->map[i];
2371 /* tlv callback for channel map ctl element
2372 * expands the pre-defined channel maps in a form of TLV
2374 static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2375 unsigned int size, unsigned int __user *tlv)
2377 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2378 const struct snd_pcm_chmap_elem *map;
2379 unsigned int __user *dst;
2386 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2390 for (map = info->chmap; map->channels; map++) {
2391 int chs_bytes = map->channels * 4;
2392 if (!valid_chmap_channels(info, map->channels))
2396 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2397 put_user(chs_bytes, dst + 1))
2402 if (size < chs_bytes)
2406 for (c = 0; c < map->channels; c++) {
2407 if (put_user(map->map[c], dst))
2412 if (put_user(count, tlv + 1))
2417 static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2419 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2420 info->pcm->streams[info->stream].chmap_kctl = NULL;
2425 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2426 * @pcm: the assigned PCM instance
2427 * @stream: stream direction
2428 * @chmap: channel map elements (for query)
2429 * @max_channels: the max number of channels for the stream
2430 * @private_value: the value passed to each kcontrol's private_value field
2431 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2433 * Create channel-mapping control elements assigned to the given PCM stream(s).
2434 * Return: Zero if successful, or a negative error value.
2436 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2437 const struct snd_pcm_chmap_elem *chmap,
2439 unsigned long private_value,
2440 struct snd_pcm_chmap **info_ret)
2442 struct snd_pcm_chmap *info;
2443 struct snd_kcontrol_new knew = {
2444 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2445 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2446 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2447 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2448 .info = pcm_chmap_ctl_info,
2449 .get = pcm_chmap_ctl_get,
2450 .tlv.c = pcm_chmap_ctl_tlv,
2454 if (WARN_ON(pcm->streams[stream].chmap_kctl))
2456 info = kzalloc(sizeof(*info), GFP_KERNEL);
2460 info->stream = stream;
2461 info->chmap = chmap;
2462 info->max_channels = max_channels;
2463 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2464 knew.name = "Playback Channel Map";
2466 knew.name = "Capture Channel Map";
2467 knew.device = pcm->device;
2468 knew.count = pcm->streams[stream].substream_count;
2469 knew.private_value = private_value;
2470 info->kctl = snd_ctl_new1(&knew, info);
2475 info->kctl->private_free = pcm_chmap_ctl_private_free;
2476 err = snd_ctl_add(pcm->card, info->kctl);
2479 pcm->streams[stream].chmap_kctl = info->kctl;
2484 EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);