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/info.h>
30 #include <sound/pcm.h>
31 #include <sound/pcm_params.h>
32 #include <sound/timer.h>
35 * fill ring buffer with silence
36 * runtime->silence_start: starting pointer to silence area
37 * runtime->silence_filled: size filled with silence
38 * runtime->silence_threshold: threshold from application
39 * runtime->silence_size: maximal size from application
41 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
43 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
45 struct snd_pcm_runtime *runtime = substream->runtime;
46 snd_pcm_uframes_t frames, ofs, transfer;
48 if (runtime->silence_size < runtime->boundary) {
49 snd_pcm_sframes_t noise_dist, n;
50 if (runtime->silence_start != runtime->control->appl_ptr) {
51 n = runtime->control->appl_ptr - runtime->silence_start;
53 n += runtime->boundary;
54 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
55 runtime->silence_filled -= n;
57 runtime->silence_filled = 0;
58 runtime->silence_start = runtime->control->appl_ptr;
60 if (runtime->silence_filled >= runtime->buffer_size)
62 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
63 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
65 frames = runtime->silence_threshold - noise_dist;
66 if (frames > runtime->silence_size)
67 frames = runtime->silence_size;
69 if (new_hw_ptr == ULONG_MAX) { /* initialization */
70 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
71 if (avail > runtime->buffer_size)
72 avail = runtime->buffer_size;
73 runtime->silence_filled = avail > 0 ? avail : 0;
74 runtime->silence_start = (runtime->status->hw_ptr +
75 runtime->silence_filled) %
78 ofs = runtime->status->hw_ptr;
79 frames = new_hw_ptr - ofs;
80 if ((snd_pcm_sframes_t)frames < 0)
81 frames += runtime->boundary;
82 runtime->silence_filled -= frames;
83 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
84 runtime->silence_filled = 0;
85 runtime->silence_start = new_hw_ptr;
87 runtime->silence_start = ofs;
90 frames = runtime->buffer_size - runtime->silence_filled;
92 if (snd_BUG_ON(frames > runtime->buffer_size))
96 ofs = runtime->silence_start % runtime->buffer_size;
98 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
99 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
100 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
101 if (substream->ops->silence) {
103 err = substream->ops->silence(substream, -1, ofs, transfer);
106 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
107 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
111 unsigned int channels = runtime->channels;
112 if (substream->ops->silence) {
113 for (c = 0; c < channels; ++c) {
115 err = substream->ops->silence(substream, c, ofs, transfer);
119 size_t dma_csize = runtime->dma_bytes / channels;
120 for (c = 0; c < channels; ++c) {
121 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
122 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
126 runtime->silence_filled += transfer;
132 #ifdef CONFIG_SND_DEBUG
133 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
134 char *name, size_t len)
136 snprintf(name, len, "pcmC%dD%d%c:%d",
137 substream->pcm->card->number,
138 substream->pcm->device,
139 substream->stream ? 'c' : 'p',
142 EXPORT_SYMBOL(snd_pcm_debug_name);
145 #define XRUN_DEBUG_BASIC (1<<0)
146 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
147 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
148 #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
149 #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
150 #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
151 #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
153 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
155 #define xrun_debug(substream, mask) \
156 ((substream)->pstr->xrun_debug & (mask))
158 #define xrun_debug(substream, mask) 0
161 #define dump_stack_on_xrun(substream) do { \
162 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
166 static void xrun(struct snd_pcm_substream *substream)
168 struct snd_pcm_runtime *runtime = substream->runtime;
170 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
171 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
172 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
173 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
175 snd_pcm_debug_name(substream, name, sizeof(name));
176 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
177 dump_stack_on_xrun(substream);
181 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
182 #define hw_ptr_error(substream, fmt, args...) \
184 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
185 xrun_log_show(substream); \
186 if (printk_ratelimit()) { \
187 snd_printd("PCM: " fmt, ##args); \
189 dump_stack_on_xrun(substream); \
193 #define XRUN_LOG_CNT 10
195 struct hwptr_log_entry {
196 unsigned int in_interrupt;
197 unsigned long jiffies;
198 snd_pcm_uframes_t pos;
199 snd_pcm_uframes_t period_size;
200 snd_pcm_uframes_t buffer_size;
201 snd_pcm_uframes_t old_hw_ptr;
202 snd_pcm_uframes_t hw_ptr_base;
205 struct snd_pcm_hwptr_log {
208 struct hwptr_log_entry entries[XRUN_LOG_CNT];
211 static void xrun_log(struct snd_pcm_substream *substream,
212 snd_pcm_uframes_t pos, int in_interrupt)
214 struct snd_pcm_runtime *runtime = substream->runtime;
215 struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
216 struct hwptr_log_entry *entry;
219 log = kzalloc(sizeof(*log), GFP_ATOMIC);
222 runtime->hwptr_log = log;
224 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
227 entry = &log->entries[log->idx];
228 entry->in_interrupt = in_interrupt;
229 entry->jiffies = jiffies;
231 entry->period_size = runtime->period_size;
232 entry->buffer_size = runtime->buffer_size;
233 entry->old_hw_ptr = runtime->status->hw_ptr;
234 entry->hw_ptr_base = runtime->hw_ptr_base;
235 log->idx = (log->idx + 1) % XRUN_LOG_CNT;
238 static void xrun_log_show(struct snd_pcm_substream *substream)
240 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
241 struct hwptr_log_entry *entry;
248 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
250 snd_pcm_debug_name(substream, name, sizeof(name));
251 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
252 entry = &log->entries[idx];
253 if (entry->period_size == 0)
255 snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
257 name, entry->in_interrupt ? "[Q] " : "",
259 (unsigned long)entry->pos,
260 (unsigned long)entry->period_size,
261 (unsigned long)entry->buffer_size,
262 (unsigned long)entry->old_hw_ptr,
263 (unsigned long)entry->hw_ptr_base);
270 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
272 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
273 #define xrun_log(substream, pos, in_interrupt) do { } while (0)
274 #define xrun_log_show(substream) do { } while (0)
278 int snd_pcm_update_state(struct snd_pcm_substream *substream,
279 struct snd_pcm_runtime *runtime)
281 snd_pcm_uframes_t avail;
283 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
284 avail = snd_pcm_playback_avail(runtime);
286 avail = snd_pcm_capture_avail(runtime);
287 if (avail > runtime->avail_max)
288 runtime->avail_max = avail;
289 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
290 if (avail >= runtime->buffer_size) {
291 snd_pcm_drain_done(substream);
295 if (avail >= runtime->stop_threshold) {
300 if (runtime->twake) {
301 if (avail >= runtime->twake)
302 wake_up(&runtime->tsleep);
303 } else if (avail >= runtime->control->avail_min)
304 wake_up(&runtime->sleep);
308 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
309 unsigned int in_interrupt)
311 struct snd_pcm_runtime *runtime = substream->runtime;
312 snd_pcm_uframes_t pos;
313 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
314 snd_pcm_sframes_t hdelta, delta;
315 unsigned long jdelta;
317 old_hw_ptr = runtime->status->hw_ptr;
318 pos = substream->ops->pointer(substream);
319 if (pos == SNDRV_PCM_POS_XRUN) {
323 if (pos >= runtime->buffer_size) {
324 if (printk_ratelimit()) {
326 snd_pcm_debug_name(substream, name, sizeof(name));
327 xrun_log_show(substream);
328 snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
329 "buffer size = %ld, period size = %ld\n",
330 name, pos, runtime->buffer_size,
331 runtime->period_size);
335 pos -= pos % runtime->min_align;
336 if (xrun_debug(substream, XRUN_DEBUG_LOG))
337 xrun_log(substream, pos, in_interrupt);
338 hw_base = runtime->hw_ptr_base;
339 new_hw_ptr = hw_base + pos;
341 /* we know that one period was processed */
342 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
343 delta = runtime->hw_ptr_interrupt + runtime->period_size;
344 if (delta > new_hw_ptr) {
345 /* check for double acknowledged interrupts */
346 hdelta = jiffies - runtime->hw_ptr_jiffies;
347 if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
348 hw_base += runtime->buffer_size;
349 if (hw_base >= runtime->boundary)
351 new_hw_ptr = hw_base + pos;
356 /* new_hw_ptr might be lower than old_hw_ptr in case when */
357 /* pointer crosses the end of the ring buffer */
358 if (new_hw_ptr < old_hw_ptr) {
359 hw_base += runtime->buffer_size;
360 if (hw_base >= runtime->boundary)
362 new_hw_ptr = hw_base + pos;
365 delta = new_hw_ptr - old_hw_ptr;
367 delta += runtime->boundary;
368 if (xrun_debug(substream, in_interrupt ?
369 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
371 snd_pcm_debug_name(substream, name, sizeof(name));
372 snd_printd("%s_update: %s: pos=%u/%u/%u, "
373 "hwptr=%ld/%ld/%ld/%ld\n",
374 in_interrupt ? "period" : "hwptr",
377 (unsigned int)runtime->period_size,
378 (unsigned int)runtime->buffer_size,
379 (unsigned long)delta,
380 (unsigned long)old_hw_ptr,
381 (unsigned long)new_hw_ptr,
382 (unsigned long)runtime->hw_ptr_base);
385 if (runtime->no_period_wakeup) {
386 snd_pcm_sframes_t xrun_threshold;
388 * Without regular period interrupts, we have to check
389 * the elapsed time to detect xruns.
391 jdelta = jiffies - runtime->hw_ptr_jiffies;
392 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
394 hdelta = jdelta - delta * HZ / runtime->rate;
395 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
396 while (hdelta > xrun_threshold) {
397 delta += runtime->buffer_size;
398 hw_base += runtime->buffer_size;
399 if (hw_base >= runtime->boundary)
401 new_hw_ptr = hw_base + pos;
402 hdelta -= runtime->hw_ptr_buffer_jiffies;
407 /* something must be really wrong */
408 if (delta >= runtime->buffer_size + runtime->period_size) {
409 hw_ptr_error(substream,
410 "Unexpected hw_pointer value %s"
411 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
413 in_interrupt ? "[Q] " : "[P]",
414 substream->stream, (long)pos,
415 (long)new_hw_ptr, (long)old_hw_ptr);
419 /* Do jiffies check only in xrun_debug mode */
420 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
421 goto no_jiffies_check;
423 /* Skip the jiffies check for hardwares with BATCH flag.
424 * Such hardware usually just increases the position at each IRQ,
425 * thus it can't give any strange position.
427 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
428 goto no_jiffies_check;
430 if (hdelta < runtime->delay)
431 goto no_jiffies_check;
432 hdelta -= runtime->delay;
433 jdelta = jiffies - runtime->hw_ptr_jiffies;
434 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
436 (((runtime->period_size * HZ) / runtime->rate)
438 /* move new_hw_ptr according jiffies not pos variable */
439 new_hw_ptr = old_hw_ptr;
441 /* use loop to avoid checks for delta overflows */
442 /* the delta value is small or zero in most cases */
444 new_hw_ptr += runtime->period_size;
445 if (new_hw_ptr >= runtime->boundary)
446 new_hw_ptr -= runtime->boundary;
449 /* align hw_base to buffer_size */
450 hw_ptr_error(substream,
451 "hw_ptr skipping! %s"
452 "(pos=%ld, delta=%ld, period=%ld, "
453 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
454 in_interrupt ? "[Q] " : "",
455 (long)pos, (long)hdelta,
456 (long)runtime->period_size, jdelta,
457 ((hdelta * HZ) / runtime->rate), hw_base,
458 (unsigned long)old_hw_ptr,
459 (unsigned long)new_hw_ptr);
460 /* reset values to proper state */
462 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
465 if (delta > runtime->period_size + runtime->period_size / 2) {
466 hw_ptr_error(substream,
467 "Lost interrupts? %s"
468 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
470 in_interrupt ? "[Q] " : "",
471 substream->stream, (long)delta,
477 if (runtime->status->hw_ptr == new_hw_ptr)
480 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
481 runtime->silence_size > 0)
482 snd_pcm_playback_silence(substream, new_hw_ptr);
485 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
487 delta += runtime->boundary;
488 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
489 runtime->hw_ptr_interrupt += delta;
490 if (runtime->hw_ptr_interrupt >= runtime->boundary)
491 runtime->hw_ptr_interrupt -= runtime->boundary;
493 runtime->hw_ptr_base = hw_base;
494 runtime->status->hw_ptr = new_hw_ptr;
495 runtime->hw_ptr_jiffies = jiffies;
496 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
497 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
499 return snd_pcm_update_state(substream, runtime);
502 /* CAUTION: call it with irq disabled */
503 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
505 return snd_pcm_update_hw_ptr0(substream, 0);
509 * snd_pcm_set_ops - set the PCM operators
510 * @pcm: the pcm instance
511 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
512 * @ops: the operator table
514 * Sets the given PCM operators to the pcm instance.
516 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
518 struct snd_pcm_str *stream = &pcm->streams[direction];
519 struct snd_pcm_substream *substream;
521 for (substream = stream->substream; substream != NULL; substream = substream->next)
522 substream->ops = ops;
525 EXPORT_SYMBOL(snd_pcm_set_ops);
528 * snd_pcm_sync - set the PCM sync id
529 * @substream: the pcm substream
531 * Sets the PCM sync identifier for the card.
533 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
535 struct snd_pcm_runtime *runtime = substream->runtime;
537 runtime->sync.id32[0] = substream->pcm->card->number;
538 runtime->sync.id32[1] = -1;
539 runtime->sync.id32[2] = -1;
540 runtime->sync.id32[3] = -1;
543 EXPORT_SYMBOL(snd_pcm_set_sync);
546 * Standard ioctl routine
549 static inline unsigned int div32(unsigned int a, unsigned int b,
560 static inline unsigned int div_down(unsigned int a, unsigned int b)
567 static inline unsigned int div_up(unsigned int a, unsigned int b)
579 static inline unsigned int mul(unsigned int a, unsigned int b)
583 if (div_down(UINT_MAX, a) < b)
588 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
589 unsigned int c, unsigned int *r)
591 u_int64_t n = (u_int64_t) a * b;
596 n = div_u64_rem(n, c, r);
605 * snd_interval_refine - refine the interval value of configurator
606 * @i: the interval value to refine
607 * @v: the interval value to refer to
609 * Refines the interval value with the reference value.
610 * The interval is changed to the range satisfying both intervals.
611 * The interval status (min, max, integer, etc.) are evaluated.
613 * Returns non-zero if the value is changed, zero if not changed.
615 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
618 if (snd_BUG_ON(snd_interval_empty(i)))
620 if (i->min < v->min) {
622 i->openmin = v->openmin;
624 } else if (i->min == v->min && !i->openmin && v->openmin) {
628 if (i->max > v->max) {
630 i->openmax = v->openmax;
632 } else if (i->max == v->max && !i->openmax && v->openmax) {
636 if (!i->integer && v->integer) {
649 } else if (!i->openmin && !i->openmax && i->min == i->max)
651 if (snd_interval_checkempty(i)) {
652 snd_interval_none(i);
658 EXPORT_SYMBOL(snd_interval_refine);
660 static int snd_interval_refine_first(struct snd_interval *i)
662 if (snd_BUG_ON(snd_interval_empty(i)))
664 if (snd_interval_single(i))
667 i->openmax = i->openmin;
673 static int snd_interval_refine_last(struct snd_interval *i)
675 if (snd_BUG_ON(snd_interval_empty(i)))
677 if (snd_interval_single(i))
680 i->openmin = i->openmax;
686 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
688 if (a->empty || b->empty) {
689 snd_interval_none(c);
693 c->min = mul(a->min, b->min);
694 c->openmin = (a->openmin || b->openmin);
695 c->max = mul(a->max, b->max);
696 c->openmax = (a->openmax || b->openmax);
697 c->integer = (a->integer && b->integer);
701 * snd_interval_div - refine the interval value with division
708 * Returns non-zero if the value is changed, zero if not changed.
710 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
713 if (a->empty || b->empty) {
714 snd_interval_none(c);
718 c->min = div32(a->min, b->max, &r);
719 c->openmin = (r || a->openmin || b->openmax);
721 c->max = div32(a->max, b->min, &r);
726 c->openmax = (a->openmax || b->openmin);
735 * snd_interval_muldivk - refine the interval value
738 * @k: divisor (as integer)
743 * Returns non-zero if the value is changed, zero if not changed.
745 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
746 unsigned int k, struct snd_interval *c)
749 if (a->empty || b->empty) {
750 snd_interval_none(c);
754 c->min = muldiv32(a->min, b->min, k, &r);
755 c->openmin = (r || a->openmin || b->openmin);
756 c->max = muldiv32(a->max, b->max, k, &r);
761 c->openmax = (a->openmax || b->openmax);
766 * snd_interval_mulkdiv - refine the interval value
768 * @k: dividend 2 (as integer)
774 * Returns non-zero if the value is changed, zero if not changed.
776 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
777 const struct snd_interval *b, struct snd_interval *c)
780 if (a->empty || b->empty) {
781 snd_interval_none(c);
785 c->min = muldiv32(a->min, k, b->max, &r);
786 c->openmin = (r || a->openmin || b->openmax);
788 c->max = muldiv32(a->max, k, b->min, &r);
793 c->openmax = (a->openmax || b->openmin);
805 * snd_interval_ratnum - refine the interval value
806 * @i: interval to refine
807 * @rats_count: number of ratnum_t
808 * @rats: ratnum_t array
809 * @nump: pointer to store the resultant numerator
810 * @denp: pointer to store the resultant denominator
812 * Returns non-zero if the value is changed, zero if not changed.
814 int snd_interval_ratnum(struct snd_interval *i,
815 unsigned int rats_count, struct snd_ratnum *rats,
816 unsigned int *nump, unsigned int *denp)
818 unsigned int best_num, best_den;
821 struct snd_interval t;
823 unsigned int result_num, result_den;
826 best_num = best_den = best_diff = 0;
827 for (k = 0; k < rats_count; ++k) {
828 unsigned int num = rats[k].num;
830 unsigned int q = i->min;
834 den = div_up(num, q);
835 if (den < rats[k].den_min)
837 if (den > rats[k].den_max)
838 den = rats[k].den_max;
841 r = (den - rats[k].den_min) % rats[k].den_step;
845 diff = num - q * den;
849 diff * best_den < best_diff * den) {
859 t.min = div_down(best_num, best_den);
860 t.openmin = !!(best_num % best_den);
862 result_num = best_num;
863 result_diff = best_diff;
864 result_den = best_den;
865 best_num = best_den = best_diff = 0;
866 for (k = 0; k < rats_count; ++k) {
867 unsigned int num = rats[k].num;
869 unsigned int q = i->max;
875 den = div_down(num, q);
876 if (den > rats[k].den_max)
878 if (den < rats[k].den_min)
879 den = rats[k].den_min;
882 r = (den - rats[k].den_min) % rats[k].den_step;
884 den += rats[k].den_step - r;
886 diff = q * den - num;
890 diff * best_den < best_diff * den) {
900 t.max = div_up(best_num, best_den);
901 t.openmax = !!(best_num % best_den);
903 err = snd_interval_refine(i, &t);
907 if (snd_interval_single(i)) {
908 if (best_diff * result_den < result_diff * best_den) {
909 result_num = best_num;
910 result_den = best_den;
920 EXPORT_SYMBOL(snd_interval_ratnum);
923 * snd_interval_ratden - refine the interval value
924 * @i: interval to refine
925 * @rats_count: number of struct ratden
926 * @rats: struct ratden array
927 * @nump: pointer to store the resultant numerator
928 * @denp: pointer to store the resultant denominator
930 * Returns non-zero if the value is changed, zero if not changed.
932 static int snd_interval_ratden(struct snd_interval *i,
933 unsigned int rats_count, struct snd_ratden *rats,
934 unsigned int *nump, unsigned int *denp)
936 unsigned int best_num, best_diff, best_den;
938 struct snd_interval t;
941 best_num = best_den = best_diff = 0;
942 for (k = 0; k < rats_count; ++k) {
944 unsigned int den = rats[k].den;
945 unsigned int q = i->min;
948 if (num > rats[k].num_max)
950 if (num < rats[k].num_min)
951 num = rats[k].num_max;
954 r = (num - rats[k].num_min) % rats[k].num_step;
956 num += rats[k].num_step - r;
958 diff = num - q * den;
960 diff * best_den < best_diff * den) {
970 t.min = div_down(best_num, best_den);
971 t.openmin = !!(best_num % best_den);
973 best_num = best_den = best_diff = 0;
974 for (k = 0; k < rats_count; ++k) {
976 unsigned int den = rats[k].den;
977 unsigned int q = i->max;
980 if (num < rats[k].num_min)
982 if (num > rats[k].num_max)
983 num = rats[k].num_max;
986 r = (num - rats[k].num_min) % rats[k].num_step;
990 diff = q * den - num;
992 diff * best_den < best_diff * den) {
1002 t.max = div_up(best_num, best_den);
1003 t.openmax = !!(best_num % best_den);
1005 err = snd_interval_refine(i, &t);
1009 if (snd_interval_single(i)) {
1019 * snd_interval_list - refine the interval value from the list
1020 * @i: the interval value to refine
1021 * @count: the number of elements in the list
1022 * @list: the value list
1023 * @mask: the bit-mask to evaluate
1025 * Refines the interval value from the list.
1026 * When mask is non-zero, only the elements corresponding to bit 1 are
1029 * Returns non-zero if the value is changed, zero if not changed.
1031 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
1034 struct snd_interval list_range;
1040 snd_interval_any(&list_range);
1041 list_range.min = UINT_MAX;
1043 for (k = 0; k < count; k++) {
1044 if (mask && !(mask & (1 << k)))
1046 if (!snd_interval_test(i, list[k]))
1048 list_range.min = min(list_range.min, list[k]);
1049 list_range.max = max(list_range.max, list[k]);
1051 return snd_interval_refine(i, &list_range);
1054 EXPORT_SYMBOL(snd_interval_list);
1056 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1060 n = (i->min - min) % step;
1061 if (n != 0 || i->openmin) {
1065 n = (i->max - min) % step;
1066 if (n != 0 || i->openmax) {
1070 if (snd_interval_checkempty(i)) {
1077 /* Info constraints helpers */
1080 * snd_pcm_hw_rule_add - add the hw-constraint rule
1081 * @runtime: the pcm runtime instance
1082 * @cond: condition bits
1083 * @var: the variable to evaluate
1084 * @func: the evaluation function
1085 * @private: the private data pointer passed to function
1086 * @dep: the dependent variables
1088 * Returns zero if successful, or a negative error code on failure.
1090 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1092 snd_pcm_hw_rule_func_t func, void *private,
1095 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1096 struct snd_pcm_hw_rule *c;
1099 va_start(args, dep);
1100 if (constrs->rules_num >= constrs->rules_all) {
1101 struct snd_pcm_hw_rule *new;
1102 unsigned int new_rules = constrs->rules_all + 16;
1103 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1108 if (constrs->rules) {
1109 memcpy(new, constrs->rules,
1110 constrs->rules_num * sizeof(*c));
1111 kfree(constrs->rules);
1113 constrs->rules = new;
1114 constrs->rules_all = new_rules;
1116 c = &constrs->rules[constrs->rules_num];
1120 c->private = private;
1123 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1130 dep = va_arg(args, int);
1132 constrs->rules_num++;
1137 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1140 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1141 * @runtime: PCM runtime instance
1142 * @var: hw_params variable to apply the mask
1143 * @mask: the bitmap mask
1145 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1147 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1150 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1151 struct snd_mask *maskp = constrs_mask(constrs, var);
1152 *maskp->bits &= mask;
1153 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1154 if (*maskp->bits == 0)
1160 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1161 * @runtime: PCM runtime instance
1162 * @var: hw_params variable to apply the mask
1163 * @mask: the 64bit bitmap mask
1165 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1167 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1170 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1171 struct snd_mask *maskp = constrs_mask(constrs, var);
1172 maskp->bits[0] &= (u_int32_t)mask;
1173 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1174 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1175 if (! maskp->bits[0] && ! maskp->bits[1])
1181 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1182 * @runtime: PCM runtime instance
1183 * @var: hw_params variable to apply the integer constraint
1185 * Apply the constraint of integer to an interval parameter.
1187 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1189 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1190 return snd_interval_setinteger(constrs_interval(constrs, var));
1193 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1196 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1197 * @runtime: PCM runtime instance
1198 * @var: hw_params variable to apply the range
1199 * @min: the minimal value
1200 * @max: the maximal value
1202 * Apply the min/max range constraint to an interval parameter.
1204 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1205 unsigned int min, unsigned int max)
1207 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1208 struct snd_interval t;
1211 t.openmin = t.openmax = 0;
1213 return snd_interval_refine(constrs_interval(constrs, var), &t);
1216 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1218 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1219 struct snd_pcm_hw_rule *rule)
1221 struct snd_pcm_hw_constraint_list *list = rule->private;
1222 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1227 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1228 * @runtime: PCM runtime instance
1229 * @cond: condition bits
1230 * @var: hw_params variable to apply the list constraint
1233 * Apply the list of constraints to an interval parameter.
1235 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1237 snd_pcm_hw_param_t var,
1238 struct snd_pcm_hw_constraint_list *l)
1240 return snd_pcm_hw_rule_add(runtime, cond, var,
1241 snd_pcm_hw_rule_list, l,
1245 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1247 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1248 struct snd_pcm_hw_rule *rule)
1250 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1251 unsigned int num = 0, den = 0;
1253 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1254 r->nrats, r->rats, &num, &den);
1255 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1256 params->rate_num = num;
1257 params->rate_den = den;
1263 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1264 * @runtime: PCM runtime instance
1265 * @cond: condition bits
1266 * @var: hw_params variable to apply the ratnums constraint
1267 * @r: struct snd_ratnums constriants
1269 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1271 snd_pcm_hw_param_t var,
1272 struct snd_pcm_hw_constraint_ratnums *r)
1274 return snd_pcm_hw_rule_add(runtime, cond, var,
1275 snd_pcm_hw_rule_ratnums, r,
1279 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1281 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1282 struct snd_pcm_hw_rule *rule)
1284 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1285 unsigned int num = 0, den = 0;
1286 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1287 r->nrats, r->rats, &num, &den);
1288 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1289 params->rate_num = num;
1290 params->rate_den = den;
1296 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1297 * @runtime: PCM runtime instance
1298 * @cond: condition bits
1299 * @var: hw_params variable to apply the ratdens constraint
1300 * @r: struct snd_ratdens constriants
1302 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1304 snd_pcm_hw_param_t var,
1305 struct snd_pcm_hw_constraint_ratdens *r)
1307 return snd_pcm_hw_rule_add(runtime, cond, var,
1308 snd_pcm_hw_rule_ratdens, r,
1312 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1314 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1315 struct snd_pcm_hw_rule *rule)
1317 unsigned int l = (unsigned long) rule->private;
1318 int width = l & 0xffff;
1319 unsigned int msbits = l >> 16;
1320 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1321 if (snd_interval_single(i) && snd_interval_value(i) == width)
1322 params->msbits = msbits;
1327 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1328 * @runtime: PCM runtime instance
1329 * @cond: condition bits
1330 * @width: sample bits width
1331 * @msbits: msbits width
1333 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1336 unsigned int msbits)
1338 unsigned long l = (msbits << 16) | width;
1339 return snd_pcm_hw_rule_add(runtime, cond, -1,
1340 snd_pcm_hw_rule_msbits,
1342 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1345 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1347 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1348 struct snd_pcm_hw_rule *rule)
1350 unsigned long step = (unsigned long) rule->private;
1351 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1355 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1356 * @runtime: PCM runtime instance
1357 * @cond: condition bits
1358 * @var: hw_params variable to apply the step constraint
1361 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1363 snd_pcm_hw_param_t var,
1366 return snd_pcm_hw_rule_add(runtime, cond, var,
1367 snd_pcm_hw_rule_step, (void *) step,
1371 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1373 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1375 static unsigned int pow2_sizes[] = {
1376 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1377 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1378 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1379 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1381 return snd_interval_list(hw_param_interval(params, rule->var),
1382 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1386 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1387 * @runtime: PCM runtime instance
1388 * @cond: condition bits
1389 * @var: hw_params variable to apply the power-of-2 constraint
1391 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1393 snd_pcm_hw_param_t var)
1395 return snd_pcm_hw_rule_add(runtime, cond, var,
1396 snd_pcm_hw_rule_pow2, NULL,
1400 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1402 static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1403 struct snd_pcm_hw_rule *rule)
1405 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1406 struct snd_interval *rate;
1408 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1409 return snd_interval_list(rate, 1, &base_rate, 0);
1413 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1414 * @runtime: PCM runtime instance
1415 * @base_rate: the rate at which the hardware does not resample
1417 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1418 unsigned int base_rate)
1420 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1421 SNDRV_PCM_HW_PARAM_RATE,
1422 snd_pcm_hw_rule_noresample_func,
1423 (void *)(uintptr_t)base_rate,
1424 SNDRV_PCM_HW_PARAM_RATE, -1);
1426 EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1428 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1429 snd_pcm_hw_param_t var)
1431 if (hw_is_mask(var)) {
1432 snd_mask_any(hw_param_mask(params, var));
1433 params->cmask |= 1 << var;
1434 params->rmask |= 1 << var;
1437 if (hw_is_interval(var)) {
1438 snd_interval_any(hw_param_interval(params, var));
1439 params->cmask |= 1 << var;
1440 params->rmask |= 1 << var;
1446 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1449 memset(params, 0, sizeof(*params));
1450 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1451 _snd_pcm_hw_param_any(params, k);
1452 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1453 _snd_pcm_hw_param_any(params, k);
1457 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1460 * snd_pcm_hw_param_value - return @params field @var value
1461 * @params: the hw_params instance
1462 * @var: parameter to retrieve
1463 * @dir: pointer to the direction (-1,0,1) or %NULL
1465 * Return the value for field @var if it's fixed in configuration space
1466 * defined by @params. Return -%EINVAL otherwise.
1468 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1469 snd_pcm_hw_param_t var, int *dir)
1471 if (hw_is_mask(var)) {
1472 const struct snd_mask *mask = hw_param_mask_c(params, var);
1473 if (!snd_mask_single(mask))
1477 return snd_mask_value(mask);
1479 if (hw_is_interval(var)) {
1480 const struct snd_interval *i = hw_param_interval_c(params, var);
1481 if (!snd_interval_single(i))
1485 return snd_interval_value(i);
1490 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1492 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1493 snd_pcm_hw_param_t var)
1495 if (hw_is_mask(var)) {
1496 snd_mask_none(hw_param_mask(params, var));
1497 params->cmask |= 1 << var;
1498 params->rmask |= 1 << var;
1499 } else if (hw_is_interval(var)) {
1500 snd_interval_none(hw_param_interval(params, var));
1501 params->cmask |= 1 << var;
1502 params->rmask |= 1 << var;
1508 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1510 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1511 snd_pcm_hw_param_t var)
1514 if (hw_is_mask(var))
1515 changed = snd_mask_refine_first(hw_param_mask(params, var));
1516 else if (hw_is_interval(var))
1517 changed = snd_interval_refine_first(hw_param_interval(params, var));
1521 params->cmask |= 1 << var;
1522 params->rmask |= 1 << var;
1529 * snd_pcm_hw_param_first - refine config space and return minimum value
1530 * @pcm: PCM instance
1531 * @params: the hw_params instance
1532 * @var: parameter to retrieve
1533 * @dir: pointer to the direction (-1,0,1) or %NULL
1535 * Inside configuration space defined by @params remove from @var all
1536 * values > minimum. Reduce configuration space accordingly.
1537 * Return the minimum.
1539 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1540 struct snd_pcm_hw_params *params,
1541 snd_pcm_hw_param_t var, int *dir)
1543 int changed = _snd_pcm_hw_param_first(params, var);
1546 if (params->rmask) {
1547 int err = snd_pcm_hw_refine(pcm, params);
1551 return snd_pcm_hw_param_value(params, var, dir);
1554 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1556 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1557 snd_pcm_hw_param_t var)
1560 if (hw_is_mask(var))
1561 changed = snd_mask_refine_last(hw_param_mask(params, var));
1562 else if (hw_is_interval(var))
1563 changed = snd_interval_refine_last(hw_param_interval(params, var));
1567 params->cmask |= 1 << var;
1568 params->rmask |= 1 << var;
1575 * snd_pcm_hw_param_last - refine config space and return maximum value
1576 * @pcm: PCM instance
1577 * @params: the hw_params instance
1578 * @var: parameter to retrieve
1579 * @dir: pointer to the direction (-1,0,1) or %NULL
1581 * Inside configuration space defined by @params remove from @var all
1582 * values < maximum. Reduce configuration space accordingly.
1583 * Return the maximum.
1585 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1586 struct snd_pcm_hw_params *params,
1587 snd_pcm_hw_param_t var, int *dir)
1589 int changed = _snd_pcm_hw_param_last(params, var);
1592 if (params->rmask) {
1593 int err = snd_pcm_hw_refine(pcm, params);
1597 return snd_pcm_hw_param_value(params, var, dir);
1600 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1603 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1604 * @pcm: PCM instance
1605 * @params: the hw_params instance
1607 * Choose one configuration from configuration space defined by @params.
1608 * The configuration chosen is that obtained fixing in this order:
1609 * first access, first format, first subformat, min channels,
1610 * min rate, min period time, max buffer size, min tick time
1612 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1613 struct snd_pcm_hw_params *params)
1615 static int vars[] = {
1616 SNDRV_PCM_HW_PARAM_ACCESS,
1617 SNDRV_PCM_HW_PARAM_FORMAT,
1618 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1619 SNDRV_PCM_HW_PARAM_CHANNELS,
1620 SNDRV_PCM_HW_PARAM_RATE,
1621 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1622 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1623 SNDRV_PCM_HW_PARAM_TICK_TIME,
1628 for (v = vars; *v != -1; v++) {
1629 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1630 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1632 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1633 if (snd_BUG_ON(err < 0))
1639 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1642 struct snd_pcm_runtime *runtime = substream->runtime;
1643 unsigned long flags;
1644 snd_pcm_stream_lock_irqsave(substream, flags);
1645 if (snd_pcm_running(substream) &&
1646 snd_pcm_update_hw_ptr(substream) >= 0)
1647 runtime->status->hw_ptr %= runtime->buffer_size;
1649 runtime->status->hw_ptr = 0;
1650 snd_pcm_stream_unlock_irqrestore(substream, flags);
1654 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1657 struct snd_pcm_channel_info *info = arg;
1658 struct snd_pcm_runtime *runtime = substream->runtime;
1660 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1664 width = snd_pcm_format_physical_width(runtime->format);
1668 switch (runtime->access) {
1669 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1670 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1671 info->first = info->channel * width;
1672 info->step = runtime->channels * width;
1674 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1675 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1677 size_t size = runtime->dma_bytes / runtime->channels;
1678 info->first = info->channel * size * 8;
1689 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1692 struct snd_pcm_hw_params *params = arg;
1693 snd_pcm_format_t format;
1697 params->fifo_size = substream->runtime->hw.fifo_size;
1698 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1699 format = params_format(params);
1700 channels = params_channels(params);
1701 frame_size = snd_pcm_format_size(format, channels);
1703 params->fifo_size /= (unsigned)frame_size;
1709 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1710 * @substream: the pcm substream instance
1711 * @cmd: ioctl command
1712 * @arg: ioctl argument
1714 * Processes the generic ioctl commands for PCM.
1715 * Can be passed as the ioctl callback for PCM ops.
1717 * Returns zero if successful, or a negative error code on failure.
1719 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1720 unsigned int cmd, void *arg)
1723 case SNDRV_PCM_IOCTL1_INFO:
1725 case SNDRV_PCM_IOCTL1_RESET:
1726 return snd_pcm_lib_ioctl_reset(substream, arg);
1727 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1728 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1729 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1730 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1735 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1738 * snd_pcm_period_elapsed - update the pcm status for the next period
1739 * @substream: the pcm substream instance
1741 * This function is called from the interrupt handler when the
1742 * PCM has processed the period size. It will update the current
1743 * pointer, wake up sleepers, etc.
1745 * Even if more than one periods have elapsed since the last call, you
1746 * have to call this only once.
1748 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1750 struct snd_pcm_runtime *runtime;
1751 unsigned long flags;
1753 if (PCM_RUNTIME_CHECK(substream))
1755 runtime = substream->runtime;
1757 if (runtime->transfer_ack_begin)
1758 runtime->transfer_ack_begin(substream);
1760 snd_pcm_stream_lock_irqsave(substream, flags);
1761 if (!snd_pcm_running(substream) ||
1762 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1765 if (substream->timer_running)
1766 snd_timer_interrupt(substream->timer, 1);
1768 if (runtime->transfer_ack_end)
1769 runtime->transfer_ack_end(substream);
1770 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1771 snd_pcm_stream_unlock_irqrestore(substream, flags);
1774 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1777 * Wait until avail_min data becomes available
1778 * Returns a negative error code if any error occurs during operation.
1779 * The available space is stored on availp. When err = 0 and avail = 0
1780 * on the capture stream, it indicates the stream is in DRAINING state.
1782 static int wait_for_avail(struct snd_pcm_substream *substream,
1783 snd_pcm_uframes_t *availp)
1785 struct snd_pcm_runtime *runtime = substream->runtime;
1786 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1789 snd_pcm_uframes_t avail = 0;
1790 long wait_time, tout;
1792 init_waitqueue_entry(&wait, current);
1793 set_current_state(TASK_INTERRUPTIBLE);
1794 add_wait_queue(&runtime->tsleep, &wait);
1796 if (runtime->no_period_wakeup)
1797 wait_time = MAX_SCHEDULE_TIMEOUT;
1800 if (runtime->rate) {
1801 long t = runtime->period_size * 2 / runtime->rate;
1802 wait_time = max(t, wait_time);
1804 wait_time = msecs_to_jiffies(wait_time * 1000);
1808 if (signal_pending(current)) {
1814 * We need to check if space became available already
1815 * (and thus the wakeup happened already) first to close
1816 * the race of space already having become available.
1817 * This check must happen after been added to the waitqueue
1818 * and having current state be INTERRUPTIBLE.
1821 avail = snd_pcm_playback_avail(runtime);
1823 avail = snd_pcm_capture_avail(runtime);
1824 if (avail >= runtime->twake)
1826 snd_pcm_stream_unlock_irq(substream);
1828 tout = schedule_timeout(wait_time);
1830 snd_pcm_stream_lock_irq(substream);
1831 set_current_state(TASK_INTERRUPTIBLE);
1832 switch (runtime->status->state) {
1833 case SNDRV_PCM_STATE_SUSPENDED:
1836 case SNDRV_PCM_STATE_XRUN:
1839 case SNDRV_PCM_STATE_DRAINING:
1843 avail = 0; /* indicate draining */
1845 case SNDRV_PCM_STATE_OPEN:
1846 case SNDRV_PCM_STATE_SETUP:
1847 case SNDRV_PCM_STATE_DISCONNECTED:
1850 case SNDRV_PCM_STATE_PAUSED:
1854 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1855 is_playback ? "playback" : "capture");
1861 set_current_state(TASK_RUNNING);
1862 remove_wait_queue(&runtime->tsleep, &wait);
1867 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1869 unsigned long data, unsigned int off,
1870 snd_pcm_uframes_t frames)
1872 struct snd_pcm_runtime *runtime = substream->runtime;
1874 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1875 if (substream->ops->copy) {
1876 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1879 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1880 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1886 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1887 unsigned long data, unsigned int off,
1888 snd_pcm_uframes_t size);
1890 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1892 snd_pcm_uframes_t size,
1894 transfer_f transfer)
1896 struct snd_pcm_runtime *runtime = substream->runtime;
1897 snd_pcm_uframes_t xfer = 0;
1898 snd_pcm_uframes_t offset = 0;
1904 snd_pcm_stream_lock_irq(substream);
1905 switch (runtime->status->state) {
1906 case SNDRV_PCM_STATE_PREPARED:
1907 case SNDRV_PCM_STATE_RUNNING:
1908 case SNDRV_PCM_STATE_PAUSED:
1910 case SNDRV_PCM_STATE_XRUN:
1913 case SNDRV_PCM_STATE_SUSPENDED:
1921 runtime->twake = runtime->control->avail_min ? : 1;
1923 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1924 snd_pcm_uframes_t avail;
1925 snd_pcm_uframes_t cont;
1926 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1927 snd_pcm_update_hw_ptr(substream);
1928 avail = snd_pcm_playback_avail(runtime);
1934 runtime->twake = min_t(snd_pcm_uframes_t, size,
1935 runtime->control->avail_min ? : 1);
1936 err = wait_for_avail(substream, &avail);
1940 frames = size > avail ? avail : size;
1941 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1944 if (snd_BUG_ON(!frames)) {
1946 snd_pcm_stream_unlock_irq(substream);
1949 appl_ptr = runtime->control->appl_ptr;
1950 appl_ofs = appl_ptr % runtime->buffer_size;
1951 snd_pcm_stream_unlock_irq(substream);
1952 err = transfer(substream, appl_ofs, data, offset, frames);
1953 snd_pcm_stream_lock_irq(substream);
1956 switch (runtime->status->state) {
1957 case SNDRV_PCM_STATE_XRUN:
1960 case SNDRV_PCM_STATE_SUSPENDED:
1967 if (appl_ptr >= runtime->boundary)
1968 appl_ptr -= runtime->boundary;
1969 runtime->control->appl_ptr = appl_ptr;
1970 if (substream->ops->ack)
1971 substream->ops->ack(substream);
1976 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1977 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1978 err = snd_pcm_start(substream);
1985 if (xfer > 0 && err >= 0)
1986 snd_pcm_update_state(substream, runtime);
1987 snd_pcm_stream_unlock_irq(substream);
1988 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1991 /* sanity-check for read/write methods */
1992 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1994 struct snd_pcm_runtime *runtime;
1995 if (PCM_RUNTIME_CHECK(substream))
1997 runtime = substream->runtime;
1998 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
2000 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2005 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2007 struct snd_pcm_runtime *runtime;
2011 err = pcm_sanity_check(substream);
2014 runtime = substream->runtime;
2015 nonblock = !!(substream->f_flags & O_NONBLOCK);
2017 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2018 runtime->channels > 1)
2020 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2021 snd_pcm_lib_write_transfer);
2024 EXPORT_SYMBOL(snd_pcm_lib_write);
2026 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
2028 unsigned long data, unsigned int off,
2029 snd_pcm_uframes_t frames)
2031 struct snd_pcm_runtime *runtime = substream->runtime;
2033 void __user **bufs = (void __user **)data;
2034 int channels = runtime->channels;
2036 if (substream->ops->copy) {
2037 if (snd_BUG_ON(!substream->ops->silence))
2039 for (c = 0; c < channels; ++c, ++bufs) {
2040 if (*bufs == NULL) {
2041 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2044 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2045 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2050 /* default transfer behaviour */
2051 size_t dma_csize = runtime->dma_bytes / channels;
2052 for (c = 0; c < channels; ++c, ++bufs) {
2053 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2054 if (*bufs == NULL) {
2055 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2057 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2058 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2066 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2068 snd_pcm_uframes_t frames)
2070 struct snd_pcm_runtime *runtime;
2074 err = pcm_sanity_check(substream);
2077 runtime = substream->runtime;
2078 nonblock = !!(substream->f_flags & O_NONBLOCK);
2080 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2082 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2083 nonblock, snd_pcm_lib_writev_transfer);
2086 EXPORT_SYMBOL(snd_pcm_lib_writev);
2088 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2090 unsigned long data, unsigned int off,
2091 snd_pcm_uframes_t frames)
2093 struct snd_pcm_runtime *runtime = substream->runtime;
2095 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2096 if (substream->ops->copy) {
2097 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2100 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2101 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2107 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2109 snd_pcm_uframes_t size,
2111 transfer_f transfer)
2113 struct snd_pcm_runtime *runtime = substream->runtime;
2114 snd_pcm_uframes_t xfer = 0;
2115 snd_pcm_uframes_t offset = 0;
2121 snd_pcm_stream_lock_irq(substream);
2122 switch (runtime->status->state) {
2123 case SNDRV_PCM_STATE_PREPARED:
2124 if (size >= runtime->start_threshold) {
2125 err = snd_pcm_start(substream);
2130 case SNDRV_PCM_STATE_DRAINING:
2131 case SNDRV_PCM_STATE_RUNNING:
2132 case SNDRV_PCM_STATE_PAUSED:
2134 case SNDRV_PCM_STATE_XRUN:
2137 case SNDRV_PCM_STATE_SUSPENDED:
2145 runtime->twake = runtime->control->avail_min ? : 1;
2147 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2148 snd_pcm_uframes_t avail;
2149 snd_pcm_uframes_t cont;
2150 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2151 snd_pcm_update_hw_ptr(substream);
2152 avail = snd_pcm_capture_avail(runtime);
2154 if (runtime->status->state ==
2155 SNDRV_PCM_STATE_DRAINING) {
2156 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2163 runtime->twake = min_t(snd_pcm_uframes_t, size,
2164 runtime->control->avail_min ? : 1);
2165 err = wait_for_avail(substream, &avail);
2169 continue; /* draining */
2171 frames = size > avail ? avail : size;
2172 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2175 if (snd_BUG_ON(!frames)) {
2177 snd_pcm_stream_unlock_irq(substream);
2180 appl_ptr = runtime->control->appl_ptr;
2181 appl_ofs = appl_ptr % runtime->buffer_size;
2182 snd_pcm_stream_unlock_irq(substream);
2183 err = transfer(substream, appl_ofs, data, offset, frames);
2184 snd_pcm_stream_lock_irq(substream);
2187 switch (runtime->status->state) {
2188 case SNDRV_PCM_STATE_XRUN:
2191 case SNDRV_PCM_STATE_SUSPENDED:
2198 if (appl_ptr >= runtime->boundary)
2199 appl_ptr -= runtime->boundary;
2200 runtime->control->appl_ptr = appl_ptr;
2201 if (substream->ops->ack)
2202 substream->ops->ack(substream);
2210 if (xfer > 0 && err >= 0)
2211 snd_pcm_update_state(substream, runtime);
2212 snd_pcm_stream_unlock_irq(substream);
2213 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2216 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2218 struct snd_pcm_runtime *runtime;
2222 err = pcm_sanity_check(substream);
2225 runtime = substream->runtime;
2226 nonblock = !!(substream->f_flags & O_NONBLOCK);
2227 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2229 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2232 EXPORT_SYMBOL(snd_pcm_lib_read);
2234 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2236 unsigned long data, unsigned int off,
2237 snd_pcm_uframes_t frames)
2239 struct snd_pcm_runtime *runtime = substream->runtime;
2241 void __user **bufs = (void __user **)data;
2242 int channels = runtime->channels;
2244 if (substream->ops->copy) {
2245 for (c = 0; c < channels; ++c, ++bufs) {
2249 buf = *bufs + samples_to_bytes(runtime, off);
2250 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2254 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2255 for (c = 0; c < channels; ++c, ++bufs) {
2261 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2262 buf = *bufs + samples_to_bytes(runtime, off);
2263 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2270 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2272 snd_pcm_uframes_t frames)
2274 struct snd_pcm_runtime *runtime;
2278 err = pcm_sanity_check(substream);
2281 runtime = substream->runtime;
2282 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2285 nonblock = !!(substream->f_flags & O_NONBLOCK);
2286 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2288 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2291 EXPORT_SYMBOL(snd_pcm_lib_readv);