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/time.h>
25 #include <linux/math64.h>
26 #include <linux/export.h>
27 #include <sound/core.h>
28 #include <sound/control.h>
29 #include <sound/tlv.h>
30 #include <sound/info.h>
31 #include <sound/pcm.h>
32 #include <sound/pcm_params.h>
33 #include <sound/timer.h>
35 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
36 #define CREATE_TRACE_POINTS
37 #include "pcm_trace.h"
39 #define trace_hwptr(substream, pos, in_interrupt)
40 #define trace_xrun(substream)
41 #define trace_hw_ptr_error(substream, reason)
45 * fill ring buffer with silence
46 * runtime->silence_start: starting pointer to silence area
47 * runtime->silence_filled: size filled with silence
48 * runtime->silence_threshold: threshold from application
49 * runtime->silence_size: maximal size from application
51 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
53 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
55 struct snd_pcm_runtime *runtime = substream->runtime;
56 snd_pcm_uframes_t frames, ofs, transfer;
58 if (runtime->silence_size < runtime->boundary) {
59 snd_pcm_sframes_t noise_dist, n;
60 if (runtime->silence_start != runtime->control->appl_ptr) {
61 n = runtime->control->appl_ptr - runtime->silence_start;
63 n += runtime->boundary;
64 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
65 runtime->silence_filled -= n;
67 runtime->silence_filled = 0;
68 runtime->silence_start = runtime->control->appl_ptr;
70 if (runtime->silence_filled >= runtime->buffer_size)
72 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
73 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
75 frames = runtime->silence_threshold - noise_dist;
76 if (frames > runtime->silence_size)
77 frames = runtime->silence_size;
79 if (new_hw_ptr == ULONG_MAX) { /* initialization */
80 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
81 if (avail > runtime->buffer_size)
82 avail = runtime->buffer_size;
83 runtime->silence_filled = avail > 0 ? avail : 0;
84 runtime->silence_start = (runtime->status->hw_ptr +
85 runtime->silence_filled) %
88 ofs = runtime->status->hw_ptr;
89 frames = new_hw_ptr - ofs;
90 if ((snd_pcm_sframes_t)frames < 0)
91 frames += runtime->boundary;
92 runtime->silence_filled -= frames;
93 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
94 runtime->silence_filled = 0;
95 runtime->silence_start = new_hw_ptr;
97 runtime->silence_start = ofs;
100 frames = runtime->buffer_size - runtime->silence_filled;
102 if (snd_BUG_ON(frames > runtime->buffer_size))
106 ofs = runtime->silence_start % runtime->buffer_size;
108 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
109 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
110 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
111 if (substream->ops->silence) {
113 err = substream->ops->silence(substream, -1, ofs, transfer);
116 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
117 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
121 unsigned int channels = runtime->channels;
122 if (substream->ops->silence) {
123 for (c = 0; c < channels; ++c) {
125 err = substream->ops->silence(substream, c, ofs, transfer);
129 size_t dma_csize = runtime->dma_bytes / channels;
130 for (c = 0; c < channels; ++c) {
131 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
132 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
136 runtime->silence_filled += transfer;
142 #ifdef CONFIG_SND_DEBUG
143 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
144 char *name, size_t len)
146 snprintf(name, len, "pcmC%dD%d%c:%d",
147 substream->pcm->card->number,
148 substream->pcm->device,
149 substream->stream ? 'c' : 'p',
152 EXPORT_SYMBOL(snd_pcm_debug_name);
155 #define XRUN_DEBUG_BASIC (1<<0)
156 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
157 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
159 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
161 #define xrun_debug(substream, mask) \
162 ((substream)->pstr->xrun_debug & (mask))
164 #define xrun_debug(substream, mask) 0
167 #define dump_stack_on_xrun(substream) do { \
168 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
172 static void xrun(struct snd_pcm_substream *substream)
174 struct snd_pcm_runtime *runtime = substream->runtime;
176 trace_xrun(substream);
177 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
178 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
179 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
180 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
182 snd_pcm_debug_name(substream, name, sizeof(name));
183 pcm_warn(substream->pcm, "XRUN: %s\n", name);
184 dump_stack_on_xrun(substream);
188 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
189 #define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
191 trace_hw_ptr_error(substream, reason); \
192 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
193 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
194 (in_interrupt) ? 'Q' : 'P', ##args); \
195 dump_stack_on_xrun(substream); \
199 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
201 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
205 int snd_pcm_update_state(struct snd_pcm_substream *substream,
206 struct snd_pcm_runtime *runtime)
208 snd_pcm_uframes_t avail;
210 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
211 avail = snd_pcm_playback_avail(runtime);
213 avail = snd_pcm_capture_avail(runtime);
214 if (avail > runtime->avail_max)
215 runtime->avail_max = avail;
216 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
217 if (avail >= runtime->buffer_size) {
218 snd_pcm_drain_done(substream);
222 if (avail >= runtime->stop_threshold) {
227 if (runtime->twake) {
228 if (avail >= runtime->twake)
229 wake_up(&runtime->tsleep);
230 } else if (avail >= runtime->control->avail_min)
231 wake_up(&runtime->sleep);
235 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
236 unsigned int in_interrupt)
238 struct snd_pcm_runtime *runtime = substream->runtime;
239 snd_pcm_uframes_t pos;
240 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
241 snd_pcm_sframes_t hdelta, delta;
242 unsigned long jdelta;
243 unsigned long curr_jiffies;
244 struct timespec curr_tstamp;
245 struct timespec audio_tstamp;
246 int crossed_boundary = 0;
248 old_hw_ptr = runtime->status->hw_ptr;
251 * group pointer, time and jiffies reads to allow for more
252 * accurate correlations/corrections.
253 * The values are stored at the end of this routine after
254 * corrections for hw_ptr position
256 pos = substream->ops->pointer(substream);
257 curr_jiffies = jiffies;
258 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
259 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
261 if ((runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) &&
262 (substream->ops->wall_clock))
263 substream->ops->wall_clock(substream, &audio_tstamp);
266 if (pos == SNDRV_PCM_POS_XRUN) {
270 if (pos >= runtime->buffer_size) {
271 if (printk_ratelimit()) {
273 snd_pcm_debug_name(substream, name, sizeof(name));
274 pcm_err(substream->pcm,
275 "BUG: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
276 name, pos, runtime->buffer_size,
277 runtime->period_size);
281 pos -= pos % runtime->min_align;
282 trace_hwptr(substream, pos, in_interrupt);
283 hw_base = runtime->hw_ptr_base;
284 new_hw_ptr = hw_base + pos;
286 /* we know that one period was processed */
287 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
288 delta = runtime->hw_ptr_interrupt + runtime->period_size;
289 if (delta > new_hw_ptr) {
290 /* check for double acknowledged interrupts */
291 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
292 if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
293 hw_base += runtime->buffer_size;
294 if (hw_base >= runtime->boundary) {
298 new_hw_ptr = hw_base + pos;
303 /* new_hw_ptr might be lower than old_hw_ptr in case when */
304 /* pointer crosses the end of the ring buffer */
305 if (new_hw_ptr < old_hw_ptr) {
306 hw_base += runtime->buffer_size;
307 if (hw_base >= runtime->boundary) {
311 new_hw_ptr = hw_base + pos;
314 delta = new_hw_ptr - old_hw_ptr;
316 delta += runtime->boundary;
318 if (runtime->no_period_wakeup) {
319 snd_pcm_sframes_t xrun_threshold;
321 * Without regular period interrupts, we have to check
322 * the elapsed time to detect xruns.
324 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
325 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
327 hdelta = jdelta - delta * HZ / runtime->rate;
328 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
329 while (hdelta > xrun_threshold) {
330 delta += runtime->buffer_size;
331 hw_base += runtime->buffer_size;
332 if (hw_base >= runtime->boundary) {
336 new_hw_ptr = hw_base + pos;
337 hdelta -= runtime->hw_ptr_buffer_jiffies;
342 /* something must be really wrong */
343 if (delta >= runtime->buffer_size + runtime->period_size) {
344 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
345 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
346 substream->stream, (long)pos,
347 (long)new_hw_ptr, (long)old_hw_ptr);
351 /* Do jiffies check only in xrun_debug mode */
352 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
353 goto no_jiffies_check;
355 /* Skip the jiffies check for hardwares with BATCH flag.
356 * Such hardware usually just increases the position at each IRQ,
357 * thus it can't give any strange position.
359 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
360 goto no_jiffies_check;
362 if (hdelta < runtime->delay)
363 goto no_jiffies_check;
364 hdelta -= runtime->delay;
365 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
366 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
368 (((runtime->period_size * HZ) / runtime->rate)
370 /* move new_hw_ptr according jiffies not pos variable */
371 new_hw_ptr = old_hw_ptr;
373 /* use loop to avoid checks for delta overflows */
374 /* the delta value is small or zero in most cases */
376 new_hw_ptr += runtime->period_size;
377 if (new_hw_ptr >= runtime->boundary) {
378 new_hw_ptr -= runtime->boundary;
383 /* align hw_base to buffer_size */
384 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
385 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
386 (long)pos, (long)hdelta,
387 (long)runtime->period_size, jdelta,
388 ((hdelta * HZ) / runtime->rate), hw_base,
389 (unsigned long)old_hw_ptr,
390 (unsigned long)new_hw_ptr);
391 /* reset values to proper state */
393 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
396 if (delta > runtime->period_size + runtime->period_size / 2) {
397 hw_ptr_error(substream, in_interrupt,
399 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
400 substream->stream, (long)delta,
406 if (runtime->status->hw_ptr == new_hw_ptr)
409 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
410 runtime->silence_size > 0)
411 snd_pcm_playback_silence(substream, new_hw_ptr);
414 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
416 delta += runtime->boundary;
417 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
418 runtime->hw_ptr_interrupt += delta;
419 if (runtime->hw_ptr_interrupt >= runtime->boundary)
420 runtime->hw_ptr_interrupt -= runtime->boundary;
422 runtime->hw_ptr_base = hw_base;
423 runtime->status->hw_ptr = new_hw_ptr;
424 runtime->hw_ptr_jiffies = curr_jiffies;
425 if (crossed_boundary) {
426 snd_BUG_ON(crossed_boundary != 1);
427 runtime->hw_ptr_wrap += runtime->boundary;
429 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
430 runtime->status->tstamp = curr_tstamp;
432 if (!(runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)) {
434 * no wall clock available, provide audio timestamp
435 * derived from pointer position+delay
437 u64 audio_frames, audio_nsecs;
439 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
440 audio_frames = runtime->hw_ptr_wrap
441 + runtime->status->hw_ptr
444 audio_frames = runtime->hw_ptr_wrap
445 + runtime->status->hw_ptr
447 audio_nsecs = div_u64(audio_frames * 1000000000LL,
449 audio_tstamp = ns_to_timespec(audio_nsecs);
451 runtime->status->audio_tstamp = audio_tstamp;
454 return snd_pcm_update_state(substream, runtime);
457 /* CAUTION: call it with irq disabled */
458 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
460 return snd_pcm_update_hw_ptr0(substream, 0);
464 * snd_pcm_set_ops - set the PCM operators
465 * @pcm: the pcm instance
466 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
467 * @ops: the operator table
469 * Sets the given PCM operators to the pcm instance.
471 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
472 const struct snd_pcm_ops *ops)
474 struct snd_pcm_str *stream = &pcm->streams[direction];
475 struct snd_pcm_substream *substream;
477 for (substream = stream->substream; substream != NULL; substream = substream->next)
478 substream->ops = ops;
481 EXPORT_SYMBOL(snd_pcm_set_ops);
484 * snd_pcm_sync - set the PCM sync id
485 * @substream: the pcm substream
487 * Sets the PCM sync identifier for the card.
489 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
491 struct snd_pcm_runtime *runtime = substream->runtime;
493 runtime->sync.id32[0] = substream->pcm->card->number;
494 runtime->sync.id32[1] = -1;
495 runtime->sync.id32[2] = -1;
496 runtime->sync.id32[3] = -1;
499 EXPORT_SYMBOL(snd_pcm_set_sync);
502 * Standard ioctl routine
505 static inline unsigned int div32(unsigned int a, unsigned int b,
516 static inline unsigned int div_down(unsigned int a, unsigned int b)
523 static inline unsigned int div_up(unsigned int a, unsigned int b)
535 static inline unsigned int mul(unsigned int a, unsigned int b)
539 if (div_down(UINT_MAX, a) < b)
544 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
545 unsigned int c, unsigned int *r)
547 u_int64_t n = (u_int64_t) a * b;
553 n = div_u64_rem(n, c, r);
562 * snd_interval_refine - refine the interval value of configurator
563 * @i: the interval value to refine
564 * @v: the interval value to refer to
566 * Refines the interval value with the reference value.
567 * The interval is changed to the range satisfying both intervals.
568 * The interval status (min, max, integer, etc.) are evaluated.
570 * Return: Positive if the value is changed, zero if it's not changed, or a
571 * negative error code.
573 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
576 if (snd_BUG_ON(snd_interval_empty(i)))
578 if (i->min < v->min) {
580 i->openmin = v->openmin;
582 } else if (i->min == v->min && !i->openmin && v->openmin) {
586 if (i->max > v->max) {
588 i->openmax = v->openmax;
590 } else if (i->max == v->max && !i->openmax && v->openmax) {
594 if (!i->integer && v->integer) {
607 } else if (!i->openmin && !i->openmax && i->min == i->max)
609 if (snd_interval_checkempty(i)) {
610 snd_interval_none(i);
616 EXPORT_SYMBOL(snd_interval_refine);
618 static int snd_interval_refine_first(struct snd_interval *i)
620 if (snd_BUG_ON(snd_interval_empty(i)))
622 if (snd_interval_single(i))
625 i->openmax = i->openmin;
631 static int snd_interval_refine_last(struct snd_interval *i)
633 if (snd_BUG_ON(snd_interval_empty(i)))
635 if (snd_interval_single(i))
638 i->openmin = i->openmax;
644 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
646 if (a->empty || b->empty) {
647 snd_interval_none(c);
651 c->min = mul(a->min, b->min);
652 c->openmin = (a->openmin || b->openmin);
653 c->max = mul(a->max, b->max);
654 c->openmax = (a->openmax || b->openmax);
655 c->integer = (a->integer && b->integer);
659 * snd_interval_div - refine the interval value with division
666 * Returns non-zero if the value is changed, zero if not changed.
668 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
671 if (a->empty || b->empty) {
672 snd_interval_none(c);
676 c->min = div32(a->min, b->max, &r);
677 c->openmin = (r || a->openmin || b->openmax);
679 c->max = div32(a->max, b->min, &r);
684 c->openmax = (a->openmax || b->openmin);
693 * snd_interval_muldivk - refine the interval value
696 * @k: divisor (as integer)
701 * Returns non-zero if the value is changed, zero if not changed.
703 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
704 unsigned int k, struct snd_interval *c)
707 if (a->empty || b->empty) {
708 snd_interval_none(c);
712 c->min = muldiv32(a->min, b->min, k, &r);
713 c->openmin = (r || a->openmin || b->openmin);
714 c->max = muldiv32(a->max, b->max, k, &r);
719 c->openmax = (a->openmax || b->openmax);
724 * snd_interval_mulkdiv - refine the interval value
726 * @k: dividend 2 (as integer)
732 * Returns non-zero if the value is changed, zero if not changed.
734 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
735 const struct snd_interval *b, struct snd_interval *c)
738 if (a->empty || b->empty) {
739 snd_interval_none(c);
743 c->min = muldiv32(a->min, k, b->max, &r);
744 c->openmin = (r || a->openmin || b->openmax);
746 c->max = muldiv32(a->max, k, b->min, &r);
751 c->openmax = (a->openmax || b->openmin);
763 * snd_interval_ratnum - refine the interval value
764 * @i: interval to refine
765 * @rats_count: number of ratnum_t
766 * @rats: ratnum_t array
767 * @nump: pointer to store the resultant numerator
768 * @denp: pointer to store the resultant denominator
770 * Return: Positive if the value is changed, zero if it's not changed, or a
771 * negative error code.
773 int snd_interval_ratnum(struct snd_interval *i,
774 unsigned int rats_count, struct snd_ratnum *rats,
775 unsigned int *nump, unsigned int *denp)
777 unsigned int best_num, best_den;
780 struct snd_interval t;
782 unsigned int result_num, result_den;
785 best_num = best_den = best_diff = 0;
786 for (k = 0; k < rats_count; ++k) {
787 unsigned int num = rats[k].num;
789 unsigned int q = i->min;
793 den = div_up(num, q);
794 if (den < rats[k].den_min)
796 if (den > rats[k].den_max)
797 den = rats[k].den_max;
800 r = (den - rats[k].den_min) % rats[k].den_step;
804 diff = num - q * den;
808 diff * best_den < best_diff * den) {
818 t.min = div_down(best_num, best_den);
819 t.openmin = !!(best_num % best_den);
821 result_num = best_num;
822 result_diff = best_diff;
823 result_den = best_den;
824 best_num = best_den = best_diff = 0;
825 for (k = 0; k < rats_count; ++k) {
826 unsigned int num = rats[k].num;
828 unsigned int q = i->max;
834 den = div_down(num, q);
835 if (den > rats[k].den_max)
837 if (den < rats[k].den_min)
838 den = rats[k].den_min;
841 r = (den - rats[k].den_min) % rats[k].den_step;
843 den += rats[k].den_step - r;
845 diff = q * den - num;
849 diff * best_den < best_diff * den) {
859 t.max = div_up(best_num, best_den);
860 t.openmax = !!(best_num % best_den);
862 err = snd_interval_refine(i, &t);
866 if (snd_interval_single(i)) {
867 if (best_diff * result_den < result_diff * best_den) {
868 result_num = best_num;
869 result_den = best_den;
879 EXPORT_SYMBOL(snd_interval_ratnum);
882 * snd_interval_ratden - refine the interval value
883 * @i: interval to refine
884 * @rats_count: number of struct ratden
885 * @rats: struct ratden array
886 * @nump: pointer to store the resultant numerator
887 * @denp: pointer to store the resultant denominator
889 * Return: Positive if the value is changed, zero if it's not changed, or a
890 * negative error code.
892 static int snd_interval_ratden(struct snd_interval *i,
893 unsigned int rats_count, struct snd_ratden *rats,
894 unsigned int *nump, unsigned int *denp)
896 unsigned int best_num, best_diff, best_den;
898 struct snd_interval t;
901 best_num = best_den = best_diff = 0;
902 for (k = 0; k < rats_count; ++k) {
904 unsigned int den = rats[k].den;
905 unsigned int q = i->min;
908 if (num > rats[k].num_max)
910 if (num < rats[k].num_min)
911 num = rats[k].num_max;
914 r = (num - rats[k].num_min) % rats[k].num_step;
916 num += rats[k].num_step - r;
918 diff = num - q * den;
920 diff * best_den < best_diff * den) {
930 t.min = div_down(best_num, best_den);
931 t.openmin = !!(best_num % best_den);
933 best_num = best_den = best_diff = 0;
934 for (k = 0; k < rats_count; ++k) {
936 unsigned int den = rats[k].den;
937 unsigned int q = i->max;
940 if (num < rats[k].num_min)
942 if (num > rats[k].num_max)
943 num = rats[k].num_max;
946 r = (num - rats[k].num_min) % rats[k].num_step;
950 diff = q * den - num;
952 diff * best_den < best_diff * den) {
962 t.max = div_up(best_num, best_den);
963 t.openmax = !!(best_num % best_den);
965 err = snd_interval_refine(i, &t);
969 if (snd_interval_single(i)) {
979 * snd_interval_list - refine the interval value from the list
980 * @i: the interval value to refine
981 * @count: the number of elements in the list
982 * @list: the value list
983 * @mask: the bit-mask to evaluate
985 * Refines the interval value from the list.
986 * When mask is non-zero, only the elements corresponding to bit 1 are
989 * Return: Positive if the value is changed, zero if it's not changed, or a
990 * negative error code.
992 int snd_interval_list(struct snd_interval *i, unsigned int count,
993 const unsigned int *list, unsigned int mask)
996 struct snd_interval list_range;
1002 snd_interval_any(&list_range);
1003 list_range.min = UINT_MAX;
1005 for (k = 0; k < count; k++) {
1006 if (mask && !(mask & (1 << k)))
1008 if (!snd_interval_test(i, list[k]))
1010 list_range.min = min(list_range.min, list[k]);
1011 list_range.max = max(list_range.max, list[k]);
1013 return snd_interval_refine(i, &list_range);
1016 EXPORT_SYMBOL(snd_interval_list);
1018 static int snd_interval_step(struct snd_interval *i, unsigned int step)
1023 if (n != 0 || i->openmin) {
1029 if (n != 0 || i->openmax) {
1034 if (snd_interval_checkempty(i)) {
1041 /* Info constraints helpers */
1044 * snd_pcm_hw_rule_add - add the hw-constraint rule
1045 * @runtime: the pcm runtime instance
1046 * @cond: condition bits
1047 * @var: the variable to evaluate
1048 * @func: the evaluation function
1049 * @private: the private data pointer passed to function
1050 * @dep: the dependent variables
1052 * Return: Zero if successful, or a negative error code on failure.
1054 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1056 snd_pcm_hw_rule_func_t func, void *private,
1059 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1060 struct snd_pcm_hw_rule *c;
1063 va_start(args, dep);
1064 if (constrs->rules_num >= constrs->rules_all) {
1065 struct snd_pcm_hw_rule *new;
1066 unsigned int new_rules = constrs->rules_all + 16;
1067 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1072 if (constrs->rules) {
1073 memcpy(new, constrs->rules,
1074 constrs->rules_num * sizeof(*c));
1075 kfree(constrs->rules);
1077 constrs->rules = new;
1078 constrs->rules_all = new_rules;
1080 c = &constrs->rules[constrs->rules_num];
1084 c->private = private;
1087 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1094 dep = va_arg(args, int);
1096 constrs->rules_num++;
1101 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1104 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1105 * @runtime: PCM runtime instance
1106 * @var: hw_params variable to apply the mask
1107 * @mask: the bitmap mask
1109 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1111 * Return: Zero if successful, or a negative error code on failure.
1113 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1116 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1117 struct snd_mask *maskp = constrs_mask(constrs, var);
1118 *maskp->bits &= mask;
1119 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1120 if (*maskp->bits == 0)
1126 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1127 * @runtime: PCM runtime instance
1128 * @var: hw_params variable to apply the mask
1129 * @mask: the 64bit bitmap mask
1131 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1133 * Return: Zero if successful, or a negative error code on failure.
1135 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1138 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1139 struct snd_mask *maskp = constrs_mask(constrs, var);
1140 maskp->bits[0] &= (u_int32_t)mask;
1141 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1142 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1143 if (! maskp->bits[0] && ! maskp->bits[1])
1147 EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1150 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1151 * @runtime: PCM runtime instance
1152 * @var: hw_params variable to apply the integer constraint
1154 * Apply the constraint of integer to an interval parameter.
1156 * Return: Positive if the value is changed, zero if it's not changed, or a
1157 * negative error code.
1159 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1161 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1162 return snd_interval_setinteger(constrs_interval(constrs, var));
1165 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1168 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1169 * @runtime: PCM runtime instance
1170 * @var: hw_params variable to apply the range
1171 * @min: the minimal value
1172 * @max: the maximal value
1174 * Apply the min/max range constraint to an interval parameter.
1176 * Return: Positive if the value is changed, zero if it's not changed, or a
1177 * negative error code.
1179 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1180 unsigned int min, unsigned int max)
1182 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1183 struct snd_interval t;
1186 t.openmin = t.openmax = 0;
1188 return snd_interval_refine(constrs_interval(constrs, var), &t);
1191 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1193 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1194 struct snd_pcm_hw_rule *rule)
1196 struct snd_pcm_hw_constraint_list *list = rule->private;
1197 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1202 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1203 * @runtime: PCM runtime instance
1204 * @cond: condition bits
1205 * @var: hw_params variable to apply the list constraint
1208 * Apply the list of constraints to an interval parameter.
1210 * Return: Zero if successful, or a negative error code on failure.
1212 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1214 snd_pcm_hw_param_t var,
1215 const struct snd_pcm_hw_constraint_list *l)
1217 return snd_pcm_hw_rule_add(runtime, cond, var,
1218 snd_pcm_hw_rule_list, (void *)l,
1222 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1224 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1225 struct snd_pcm_hw_rule *rule)
1227 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1228 unsigned int num = 0, den = 0;
1230 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1231 r->nrats, r->rats, &num, &den);
1232 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1233 params->rate_num = num;
1234 params->rate_den = den;
1240 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1241 * @runtime: PCM runtime instance
1242 * @cond: condition bits
1243 * @var: hw_params variable to apply the ratnums constraint
1244 * @r: struct snd_ratnums constriants
1246 * Return: Zero if successful, or a negative error code on failure.
1248 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1250 snd_pcm_hw_param_t var,
1251 struct snd_pcm_hw_constraint_ratnums *r)
1253 return snd_pcm_hw_rule_add(runtime, cond, var,
1254 snd_pcm_hw_rule_ratnums, r,
1258 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1260 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1261 struct snd_pcm_hw_rule *rule)
1263 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1264 unsigned int num = 0, den = 0;
1265 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1266 r->nrats, r->rats, &num, &den);
1267 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1268 params->rate_num = num;
1269 params->rate_den = den;
1275 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1276 * @runtime: PCM runtime instance
1277 * @cond: condition bits
1278 * @var: hw_params variable to apply the ratdens constraint
1279 * @r: struct snd_ratdens constriants
1281 * Return: Zero if successful, or a negative error code on failure.
1283 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1285 snd_pcm_hw_param_t var,
1286 struct snd_pcm_hw_constraint_ratdens *r)
1288 return snd_pcm_hw_rule_add(runtime, cond, var,
1289 snd_pcm_hw_rule_ratdens, r,
1293 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1295 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1296 struct snd_pcm_hw_rule *rule)
1298 unsigned int l = (unsigned long) rule->private;
1299 int width = l & 0xffff;
1300 unsigned int msbits = l >> 16;
1301 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1302 if (snd_interval_single(i) && snd_interval_value(i) == width)
1303 params->msbits = msbits;
1308 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1309 * @runtime: PCM runtime instance
1310 * @cond: condition bits
1311 * @width: sample bits width
1312 * @msbits: msbits width
1314 * Return: Zero if successful, or a negative error code on failure.
1316 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1319 unsigned int msbits)
1321 unsigned long l = (msbits << 16) | width;
1322 return snd_pcm_hw_rule_add(runtime, cond, -1,
1323 snd_pcm_hw_rule_msbits,
1325 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1328 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1330 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1331 struct snd_pcm_hw_rule *rule)
1333 unsigned long step = (unsigned long) rule->private;
1334 return snd_interval_step(hw_param_interval(params, rule->var), step);
1338 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1339 * @runtime: PCM runtime instance
1340 * @cond: condition bits
1341 * @var: hw_params variable to apply the step constraint
1344 * Return: Zero if successful, or a negative error code on failure.
1346 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1348 snd_pcm_hw_param_t var,
1351 return snd_pcm_hw_rule_add(runtime, cond, var,
1352 snd_pcm_hw_rule_step, (void *) step,
1356 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1358 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1360 static unsigned int pow2_sizes[] = {
1361 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1362 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1363 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1364 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1366 return snd_interval_list(hw_param_interval(params, rule->var),
1367 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1371 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1372 * @runtime: PCM runtime instance
1373 * @cond: condition bits
1374 * @var: hw_params variable to apply the power-of-2 constraint
1376 * Return: Zero if successful, or a negative error code on failure.
1378 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1380 snd_pcm_hw_param_t var)
1382 return snd_pcm_hw_rule_add(runtime, cond, var,
1383 snd_pcm_hw_rule_pow2, NULL,
1387 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1389 static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1390 struct snd_pcm_hw_rule *rule)
1392 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1393 struct snd_interval *rate;
1395 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1396 return snd_interval_list(rate, 1, &base_rate, 0);
1400 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1401 * @runtime: PCM runtime instance
1402 * @base_rate: the rate at which the hardware does not resample
1404 * Return: Zero if successful, or a negative error code on failure.
1406 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1407 unsigned int base_rate)
1409 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1410 SNDRV_PCM_HW_PARAM_RATE,
1411 snd_pcm_hw_rule_noresample_func,
1412 (void *)(uintptr_t)base_rate,
1413 SNDRV_PCM_HW_PARAM_RATE, -1);
1415 EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1417 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1418 snd_pcm_hw_param_t var)
1420 if (hw_is_mask(var)) {
1421 snd_mask_any(hw_param_mask(params, var));
1422 params->cmask |= 1 << var;
1423 params->rmask |= 1 << var;
1426 if (hw_is_interval(var)) {
1427 snd_interval_any(hw_param_interval(params, var));
1428 params->cmask |= 1 << var;
1429 params->rmask |= 1 << var;
1435 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1438 memset(params, 0, sizeof(*params));
1439 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1440 _snd_pcm_hw_param_any(params, k);
1441 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1442 _snd_pcm_hw_param_any(params, k);
1446 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1449 * snd_pcm_hw_param_value - return @params field @var value
1450 * @params: the hw_params instance
1451 * @var: parameter to retrieve
1452 * @dir: pointer to the direction (-1,0,1) or %NULL
1454 * Return: The value for field @var if it's fixed in configuration space
1455 * defined by @params. -%EINVAL otherwise.
1457 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1458 snd_pcm_hw_param_t var, int *dir)
1460 if (hw_is_mask(var)) {
1461 const struct snd_mask *mask = hw_param_mask_c(params, var);
1462 if (!snd_mask_single(mask))
1466 return snd_mask_value(mask);
1468 if (hw_is_interval(var)) {
1469 const struct snd_interval *i = hw_param_interval_c(params, var);
1470 if (!snd_interval_single(i))
1474 return snd_interval_value(i);
1479 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1481 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1482 snd_pcm_hw_param_t var)
1484 if (hw_is_mask(var)) {
1485 snd_mask_none(hw_param_mask(params, var));
1486 params->cmask |= 1 << var;
1487 params->rmask |= 1 << var;
1488 } else if (hw_is_interval(var)) {
1489 snd_interval_none(hw_param_interval(params, var));
1490 params->cmask |= 1 << var;
1491 params->rmask |= 1 << var;
1497 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1499 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1500 snd_pcm_hw_param_t var)
1503 if (hw_is_mask(var))
1504 changed = snd_mask_refine_first(hw_param_mask(params, var));
1505 else if (hw_is_interval(var))
1506 changed = snd_interval_refine_first(hw_param_interval(params, var));
1510 params->cmask |= 1 << var;
1511 params->rmask |= 1 << var;
1518 * snd_pcm_hw_param_first - refine config space and return minimum value
1519 * @pcm: PCM instance
1520 * @params: the hw_params instance
1521 * @var: parameter to retrieve
1522 * @dir: pointer to the direction (-1,0,1) or %NULL
1524 * Inside configuration space defined by @params remove from @var all
1525 * values > minimum. Reduce configuration space accordingly.
1527 * Return: The minimum, or a negative error code on failure.
1529 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1530 struct snd_pcm_hw_params *params,
1531 snd_pcm_hw_param_t var, int *dir)
1533 int changed = _snd_pcm_hw_param_first(params, var);
1536 if (params->rmask) {
1537 int err = snd_pcm_hw_refine(pcm, params);
1538 if (snd_BUG_ON(err < 0))
1541 return snd_pcm_hw_param_value(params, var, dir);
1544 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1546 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1547 snd_pcm_hw_param_t var)
1550 if (hw_is_mask(var))
1551 changed = snd_mask_refine_last(hw_param_mask(params, var));
1552 else if (hw_is_interval(var))
1553 changed = snd_interval_refine_last(hw_param_interval(params, var));
1557 params->cmask |= 1 << var;
1558 params->rmask |= 1 << var;
1565 * snd_pcm_hw_param_last - refine config space and return maximum value
1566 * @pcm: PCM instance
1567 * @params: the hw_params instance
1568 * @var: parameter to retrieve
1569 * @dir: pointer to the direction (-1,0,1) or %NULL
1571 * Inside configuration space defined by @params remove from @var all
1572 * values < maximum. Reduce configuration space accordingly.
1574 * Return: The maximum, or a negative error code on failure.
1576 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1577 struct snd_pcm_hw_params *params,
1578 snd_pcm_hw_param_t var, int *dir)
1580 int changed = _snd_pcm_hw_param_last(params, var);
1583 if (params->rmask) {
1584 int err = snd_pcm_hw_refine(pcm, params);
1585 if (snd_BUG_ON(err < 0))
1588 return snd_pcm_hw_param_value(params, var, dir);
1591 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1594 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1595 * @pcm: PCM instance
1596 * @params: the hw_params instance
1598 * Choose one configuration from configuration space defined by @params.
1599 * The configuration chosen is that obtained fixing in this order:
1600 * first access, first format, first subformat, min channels,
1601 * min rate, min period time, max buffer size, min tick time
1603 * Return: Zero if successful, or a negative error code on failure.
1605 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1606 struct snd_pcm_hw_params *params)
1608 static int vars[] = {
1609 SNDRV_PCM_HW_PARAM_ACCESS,
1610 SNDRV_PCM_HW_PARAM_FORMAT,
1611 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1612 SNDRV_PCM_HW_PARAM_CHANNELS,
1613 SNDRV_PCM_HW_PARAM_RATE,
1614 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1615 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1616 SNDRV_PCM_HW_PARAM_TICK_TIME,
1621 for (v = vars; *v != -1; v++) {
1622 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1623 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1625 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1626 if (snd_BUG_ON(err < 0))
1632 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1635 struct snd_pcm_runtime *runtime = substream->runtime;
1636 unsigned long flags;
1637 snd_pcm_stream_lock_irqsave(substream, flags);
1638 if (snd_pcm_running(substream) &&
1639 snd_pcm_update_hw_ptr(substream) >= 0)
1640 runtime->status->hw_ptr %= runtime->buffer_size;
1642 runtime->status->hw_ptr = 0;
1643 runtime->hw_ptr_wrap = 0;
1645 snd_pcm_stream_unlock_irqrestore(substream, flags);
1649 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1652 struct snd_pcm_channel_info *info = arg;
1653 struct snd_pcm_runtime *runtime = substream->runtime;
1655 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1659 width = snd_pcm_format_physical_width(runtime->format);
1663 switch (runtime->access) {
1664 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1665 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1666 info->first = info->channel * width;
1667 info->step = runtime->channels * width;
1669 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1670 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1672 size_t size = runtime->dma_bytes / runtime->channels;
1673 info->first = info->channel * size * 8;
1684 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1687 struct snd_pcm_hw_params *params = arg;
1688 snd_pcm_format_t format;
1692 params->fifo_size = substream->runtime->hw.fifo_size;
1693 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1694 format = params_format(params);
1695 channels = params_channels(params);
1696 frame_size = snd_pcm_format_size(format, channels);
1698 params->fifo_size /= (unsigned)frame_size;
1704 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1705 * @substream: the pcm substream instance
1706 * @cmd: ioctl command
1707 * @arg: ioctl argument
1709 * Processes the generic ioctl commands for PCM.
1710 * Can be passed as the ioctl callback for PCM ops.
1712 * Return: Zero if successful, or a negative error code on failure.
1714 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1715 unsigned int cmd, void *arg)
1718 case SNDRV_PCM_IOCTL1_INFO:
1720 case SNDRV_PCM_IOCTL1_RESET:
1721 return snd_pcm_lib_ioctl_reset(substream, arg);
1722 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1723 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1724 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1725 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1730 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1733 * snd_pcm_period_elapsed - update the pcm status for the next period
1734 * @substream: the pcm substream instance
1736 * This function is called from the interrupt handler when the
1737 * PCM has processed the period size. It will update the current
1738 * pointer, wake up sleepers, etc.
1740 * Even if more than one periods have elapsed since the last call, you
1741 * have to call this only once.
1743 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1745 struct snd_pcm_runtime *runtime;
1746 unsigned long flags;
1748 if (PCM_RUNTIME_CHECK(substream))
1750 runtime = substream->runtime;
1752 if (runtime->transfer_ack_begin)
1753 runtime->transfer_ack_begin(substream);
1755 snd_pcm_stream_lock_irqsave(substream, flags);
1756 if (!snd_pcm_running(substream) ||
1757 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1760 if (substream->timer_running)
1761 snd_timer_interrupt(substream->timer, 1);
1763 snd_pcm_stream_unlock_irqrestore(substream, flags);
1764 if (runtime->transfer_ack_end)
1765 runtime->transfer_ack_end(substream);
1766 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1769 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1772 * Wait until avail_min data becomes available
1773 * Returns a negative error code if any error occurs during operation.
1774 * The available space is stored on availp. When err = 0 and avail = 0
1775 * on the capture stream, it indicates the stream is in DRAINING state.
1777 static int wait_for_avail(struct snd_pcm_substream *substream,
1778 snd_pcm_uframes_t *availp)
1780 struct snd_pcm_runtime *runtime = substream->runtime;
1781 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1784 snd_pcm_uframes_t avail = 0;
1785 long wait_time, tout;
1787 init_waitqueue_entry(&wait, current);
1788 set_current_state(TASK_INTERRUPTIBLE);
1789 add_wait_queue(&runtime->tsleep, &wait);
1791 if (runtime->no_period_wakeup)
1792 wait_time = MAX_SCHEDULE_TIMEOUT;
1795 if (runtime->rate) {
1796 long t = runtime->period_size * 2 / runtime->rate;
1797 wait_time = max(t, wait_time);
1799 wait_time = msecs_to_jiffies(wait_time * 1000);
1803 if (signal_pending(current)) {
1809 * We need to check if space became available already
1810 * (and thus the wakeup happened already) first to close
1811 * the race of space already having become available.
1812 * This check must happen after been added to the waitqueue
1813 * and having current state be INTERRUPTIBLE.
1816 avail = snd_pcm_playback_avail(runtime);
1818 avail = snd_pcm_capture_avail(runtime);
1819 if (avail >= runtime->twake)
1821 snd_pcm_stream_unlock_irq(substream);
1823 tout = schedule_timeout(wait_time);
1825 snd_pcm_stream_lock_irq(substream);
1826 set_current_state(TASK_INTERRUPTIBLE);
1827 switch (runtime->status->state) {
1828 case SNDRV_PCM_STATE_SUSPENDED:
1831 case SNDRV_PCM_STATE_XRUN:
1834 case SNDRV_PCM_STATE_DRAINING:
1838 avail = 0; /* indicate draining */
1840 case SNDRV_PCM_STATE_OPEN:
1841 case SNDRV_PCM_STATE_SETUP:
1842 case SNDRV_PCM_STATE_DISCONNECTED:
1845 case SNDRV_PCM_STATE_PAUSED:
1849 pcm_dbg(substream->pcm,
1850 "%s write error (DMA or IRQ trouble?)\n",
1851 is_playback ? "playback" : "capture");
1857 set_current_state(TASK_RUNNING);
1858 remove_wait_queue(&runtime->tsleep, &wait);
1863 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1865 unsigned long data, unsigned int off,
1866 snd_pcm_uframes_t frames)
1868 struct snd_pcm_runtime *runtime = substream->runtime;
1870 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1871 if (substream->ops->copy) {
1872 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1875 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1876 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1882 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1883 unsigned long data, unsigned int off,
1884 snd_pcm_uframes_t size);
1886 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1888 snd_pcm_uframes_t size,
1890 transfer_f transfer)
1892 struct snd_pcm_runtime *runtime = substream->runtime;
1893 snd_pcm_uframes_t xfer = 0;
1894 snd_pcm_uframes_t offset = 0;
1895 snd_pcm_uframes_t avail;
1901 snd_pcm_stream_lock_irq(substream);
1902 switch (runtime->status->state) {
1903 case SNDRV_PCM_STATE_PREPARED:
1904 case SNDRV_PCM_STATE_RUNNING:
1905 case SNDRV_PCM_STATE_PAUSED:
1907 case SNDRV_PCM_STATE_XRUN:
1910 case SNDRV_PCM_STATE_SUSPENDED:
1918 runtime->twake = runtime->control->avail_min ? : 1;
1919 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1920 snd_pcm_update_hw_ptr(substream);
1921 avail = snd_pcm_playback_avail(runtime);
1923 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1924 snd_pcm_uframes_t cont;
1930 runtime->twake = min_t(snd_pcm_uframes_t, size,
1931 runtime->control->avail_min ? : 1);
1932 err = wait_for_avail(substream, &avail);
1936 frames = size > avail ? avail : size;
1937 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1940 if (snd_BUG_ON(!frames)) {
1942 snd_pcm_stream_unlock_irq(substream);
1945 appl_ptr = runtime->control->appl_ptr;
1946 appl_ofs = appl_ptr % runtime->buffer_size;
1947 snd_pcm_stream_unlock_irq(substream);
1948 err = transfer(substream, appl_ofs, data, offset, frames);
1949 snd_pcm_stream_lock_irq(substream);
1952 switch (runtime->status->state) {
1953 case SNDRV_PCM_STATE_XRUN:
1956 case SNDRV_PCM_STATE_SUSPENDED:
1963 if (appl_ptr >= runtime->boundary)
1964 appl_ptr -= runtime->boundary;
1965 runtime->control->appl_ptr = appl_ptr;
1966 if (substream->ops->ack)
1967 substream->ops->ack(substream);
1973 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1974 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1975 err = snd_pcm_start(substream);
1982 if (xfer > 0 && err >= 0)
1983 snd_pcm_update_state(substream, runtime);
1984 snd_pcm_stream_unlock_irq(substream);
1985 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1988 /* sanity-check for read/write methods */
1989 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1991 struct snd_pcm_runtime *runtime;
1992 if (PCM_RUNTIME_CHECK(substream))
1994 runtime = substream->runtime;
1995 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1997 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2002 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2004 struct snd_pcm_runtime *runtime;
2008 err = pcm_sanity_check(substream);
2011 runtime = substream->runtime;
2012 nonblock = !!(substream->f_flags & O_NONBLOCK);
2014 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2015 runtime->channels > 1)
2017 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2018 snd_pcm_lib_write_transfer);
2021 EXPORT_SYMBOL(snd_pcm_lib_write);
2023 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
2025 unsigned long data, unsigned int off,
2026 snd_pcm_uframes_t frames)
2028 struct snd_pcm_runtime *runtime = substream->runtime;
2030 void __user **bufs = (void __user **)data;
2031 int channels = runtime->channels;
2033 if (substream->ops->copy) {
2034 if (snd_BUG_ON(!substream->ops->silence))
2036 for (c = 0; c < channels; ++c, ++bufs) {
2037 if (*bufs == NULL) {
2038 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2041 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2042 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2047 /* default transfer behaviour */
2048 size_t dma_csize = runtime->dma_bytes / channels;
2049 for (c = 0; c < channels; ++c, ++bufs) {
2050 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2051 if (*bufs == NULL) {
2052 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2054 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2055 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2063 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2065 snd_pcm_uframes_t frames)
2067 struct snd_pcm_runtime *runtime;
2071 err = pcm_sanity_check(substream);
2074 runtime = substream->runtime;
2075 nonblock = !!(substream->f_flags & O_NONBLOCK);
2077 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2079 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2080 nonblock, snd_pcm_lib_writev_transfer);
2083 EXPORT_SYMBOL(snd_pcm_lib_writev);
2085 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2087 unsigned long data, unsigned int off,
2088 snd_pcm_uframes_t frames)
2090 struct snd_pcm_runtime *runtime = substream->runtime;
2092 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2093 if (substream->ops->copy) {
2094 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2097 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2098 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2104 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2106 snd_pcm_uframes_t size,
2108 transfer_f transfer)
2110 struct snd_pcm_runtime *runtime = substream->runtime;
2111 snd_pcm_uframes_t xfer = 0;
2112 snd_pcm_uframes_t offset = 0;
2113 snd_pcm_uframes_t avail;
2119 snd_pcm_stream_lock_irq(substream);
2120 switch (runtime->status->state) {
2121 case SNDRV_PCM_STATE_PREPARED:
2122 if (size >= runtime->start_threshold) {
2123 err = snd_pcm_start(substream);
2128 case SNDRV_PCM_STATE_DRAINING:
2129 case SNDRV_PCM_STATE_RUNNING:
2130 case SNDRV_PCM_STATE_PAUSED:
2132 case SNDRV_PCM_STATE_XRUN:
2135 case SNDRV_PCM_STATE_SUSPENDED:
2143 runtime->twake = runtime->control->avail_min ? : 1;
2144 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2145 snd_pcm_update_hw_ptr(substream);
2146 avail = snd_pcm_capture_avail(runtime);
2148 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2149 snd_pcm_uframes_t cont;
2151 if (runtime->status->state ==
2152 SNDRV_PCM_STATE_DRAINING) {
2153 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2160 runtime->twake = min_t(snd_pcm_uframes_t, size,
2161 runtime->control->avail_min ? : 1);
2162 err = wait_for_avail(substream, &avail);
2166 continue; /* draining */
2168 frames = size > avail ? avail : size;
2169 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2172 if (snd_BUG_ON(!frames)) {
2174 snd_pcm_stream_unlock_irq(substream);
2177 appl_ptr = runtime->control->appl_ptr;
2178 appl_ofs = appl_ptr % runtime->buffer_size;
2179 snd_pcm_stream_unlock_irq(substream);
2180 err = transfer(substream, appl_ofs, data, offset, frames);
2181 snd_pcm_stream_lock_irq(substream);
2184 switch (runtime->status->state) {
2185 case SNDRV_PCM_STATE_XRUN:
2188 case SNDRV_PCM_STATE_SUSPENDED:
2195 if (appl_ptr >= runtime->boundary)
2196 appl_ptr -= runtime->boundary;
2197 runtime->control->appl_ptr = appl_ptr;
2198 if (substream->ops->ack)
2199 substream->ops->ack(substream);
2208 if (xfer > 0 && err >= 0)
2209 snd_pcm_update_state(substream, runtime);
2210 snd_pcm_stream_unlock_irq(substream);
2211 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2214 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2216 struct snd_pcm_runtime *runtime;
2220 err = pcm_sanity_check(substream);
2223 runtime = substream->runtime;
2224 nonblock = !!(substream->f_flags & O_NONBLOCK);
2225 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2227 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2230 EXPORT_SYMBOL(snd_pcm_lib_read);
2232 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2234 unsigned long data, unsigned int off,
2235 snd_pcm_uframes_t frames)
2237 struct snd_pcm_runtime *runtime = substream->runtime;
2239 void __user **bufs = (void __user **)data;
2240 int channels = runtime->channels;
2242 if (substream->ops->copy) {
2243 for (c = 0; c < channels; ++c, ++bufs) {
2247 buf = *bufs + samples_to_bytes(runtime, off);
2248 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2252 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2253 for (c = 0; c < channels; ++c, ++bufs) {
2259 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2260 buf = *bufs + samples_to_bytes(runtime, off);
2261 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2268 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2270 snd_pcm_uframes_t frames)
2272 struct snd_pcm_runtime *runtime;
2276 err = pcm_sanity_check(substream);
2279 runtime = substream->runtime;
2280 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2283 nonblock = !!(substream->f_flags & O_NONBLOCK);
2284 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2286 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2289 EXPORT_SYMBOL(snd_pcm_lib_readv);
2292 * standard channel mapping helpers
2295 /* default channel maps for multi-channel playbacks, up to 8 channels */
2296 const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2298 .map = { SNDRV_CHMAP_MONO } },
2300 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2302 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2303 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2305 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2306 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2307 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2309 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2310 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2311 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2312 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2315 EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2317 /* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2318 const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2320 .map = { SNDRV_CHMAP_MONO } },
2322 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2324 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2325 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2327 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2328 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2329 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2331 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2332 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2333 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2334 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2337 EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2339 static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2341 if (ch > info->max_channels)
2343 return !info->channel_mask || (info->channel_mask & (1U << ch));
2346 static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2347 struct snd_ctl_elem_info *uinfo)
2349 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2351 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2353 uinfo->count = info->max_channels;
2354 uinfo->value.integer.min = 0;
2355 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2359 /* get callback for channel map ctl element
2360 * stores the channel position firstly matching with the current channels
2362 static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2363 struct snd_ctl_elem_value *ucontrol)
2365 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2366 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2367 struct snd_pcm_substream *substream;
2368 const struct snd_pcm_chmap_elem *map;
2370 if (snd_BUG_ON(!info->chmap))
2372 substream = snd_pcm_chmap_substream(info, idx);
2375 memset(ucontrol->value.integer.value, 0,
2376 sizeof(ucontrol->value.integer.value));
2377 if (!substream->runtime)
2378 return 0; /* no channels set */
2379 for (map = info->chmap; map->channels; map++) {
2381 if (map->channels == substream->runtime->channels &&
2382 valid_chmap_channels(info, map->channels)) {
2383 for (i = 0; i < map->channels; i++)
2384 ucontrol->value.integer.value[i] = map->map[i];
2391 /* tlv callback for channel map ctl element
2392 * expands the pre-defined channel maps in a form of TLV
2394 static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2395 unsigned int size, unsigned int __user *tlv)
2397 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2398 const struct snd_pcm_chmap_elem *map;
2399 unsigned int __user *dst;
2402 if (snd_BUG_ON(!info->chmap))
2406 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2410 for (map = info->chmap; map->channels; map++) {
2411 int chs_bytes = map->channels * 4;
2412 if (!valid_chmap_channels(info, map->channels))
2416 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2417 put_user(chs_bytes, dst + 1))
2422 if (size < chs_bytes)
2426 for (c = 0; c < map->channels; c++) {
2427 if (put_user(map->map[c], dst))
2432 if (put_user(count, tlv + 1))
2437 static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2439 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2440 info->pcm->streams[info->stream].chmap_kctl = NULL;
2445 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2446 * @pcm: the assigned PCM instance
2447 * @stream: stream direction
2448 * @chmap: channel map elements (for query)
2449 * @max_channels: the max number of channels for the stream
2450 * @private_value: the value passed to each kcontrol's private_value field
2451 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2453 * Create channel-mapping control elements assigned to the given PCM stream(s).
2454 * Return: Zero if successful, or a negative error value.
2456 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2457 const struct snd_pcm_chmap_elem *chmap,
2459 unsigned long private_value,
2460 struct snd_pcm_chmap **info_ret)
2462 struct snd_pcm_chmap *info;
2463 struct snd_kcontrol_new knew = {
2464 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2465 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2466 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2467 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2468 .info = pcm_chmap_ctl_info,
2469 .get = pcm_chmap_ctl_get,
2470 .tlv.c = pcm_chmap_ctl_tlv,
2474 info = kzalloc(sizeof(*info), GFP_KERNEL);
2478 info->stream = stream;
2479 info->chmap = chmap;
2480 info->max_channels = max_channels;
2481 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2482 knew.name = "Playback Channel Map";
2484 knew.name = "Capture Channel Map";
2485 knew.device = pcm->device;
2486 knew.count = pcm->streams[stream].substream_count;
2487 knew.private_value = private_value;
2488 info->kctl = snd_ctl_new1(&knew, info);
2493 info->kctl->private_free = pcm_chmap_ctl_private_free;
2494 err = snd_ctl_add(pcm->card, info->kctl);
2497 pcm->streams[stream].chmap_kctl = info->kctl;
2502 EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);