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 <sound/core.h>
27 #include <sound/control.h>
28 #include <sound/info.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/timer.h>
34 * fill ring buffer with silence
35 * runtime->silence_start: starting pointer to silence area
36 * runtime->silence_filled: size filled with silence
37 * runtime->silence_threshold: threshold from application
38 * runtime->silence_size: maximal size from application
40 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
42 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
44 struct snd_pcm_runtime *runtime = substream->runtime;
45 snd_pcm_uframes_t frames, ofs, transfer;
47 if (runtime->silence_size < runtime->boundary) {
48 snd_pcm_sframes_t noise_dist, n;
49 if (runtime->silence_start != runtime->control->appl_ptr) {
50 n = runtime->control->appl_ptr - runtime->silence_start;
52 n += runtime->boundary;
53 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
54 runtime->silence_filled -= n;
56 runtime->silence_filled = 0;
57 runtime->silence_start = runtime->control->appl_ptr;
59 if (runtime->silence_filled >= runtime->buffer_size)
61 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
62 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
64 frames = runtime->silence_threshold - noise_dist;
65 if (frames > runtime->silence_size)
66 frames = runtime->silence_size;
68 if (new_hw_ptr == ULONG_MAX) { /* initialization */
69 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
70 if (avail > runtime->buffer_size)
71 avail = runtime->buffer_size;
72 runtime->silence_filled = avail > 0 ? avail : 0;
73 runtime->silence_start = (runtime->status->hw_ptr +
74 runtime->silence_filled) %
77 ofs = runtime->status->hw_ptr;
78 frames = new_hw_ptr - ofs;
79 if ((snd_pcm_sframes_t)frames < 0)
80 frames += runtime->boundary;
81 runtime->silence_filled -= frames;
82 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
83 runtime->silence_filled = 0;
84 runtime->silence_start = new_hw_ptr;
86 runtime->silence_start = ofs;
89 frames = runtime->buffer_size - runtime->silence_filled;
91 if (snd_BUG_ON(frames > runtime->buffer_size))
95 ofs = runtime->silence_start % runtime->buffer_size;
97 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
98 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
99 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
100 if (substream->ops->silence) {
102 err = substream->ops->silence(substream, -1, ofs, transfer);
105 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
106 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
110 unsigned int channels = runtime->channels;
111 if (substream->ops->silence) {
112 for (c = 0; c < channels; ++c) {
114 err = substream->ops->silence(substream, c, ofs, transfer);
118 size_t dma_csize = runtime->dma_bytes / channels;
119 for (c = 0; c < channels; ++c) {
120 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
121 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
125 runtime->silence_filled += transfer;
131 static void pcm_debug_name(struct snd_pcm_substream *substream,
132 char *name, size_t len)
134 snprintf(name, len, "pcmC%dD%d%c:%d",
135 substream->pcm->card->number,
136 substream->pcm->device,
137 substream->stream ? 'c' : 'p',
141 #define XRUN_DEBUG_BASIC (1<<0)
142 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
143 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
144 #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
145 #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
146 #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
147 #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
149 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
151 #define xrun_debug(substream, mask) \
152 ((substream)->pstr->xrun_debug & (mask))
154 #define xrun_debug(substream, mask) 0
157 #define dump_stack_on_xrun(substream) do { \
158 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
162 static void xrun(struct snd_pcm_substream *substream)
164 struct snd_pcm_runtime *runtime = substream->runtime;
166 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
167 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
168 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
169 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
171 pcm_debug_name(substream, name, sizeof(name));
172 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
173 dump_stack_on_xrun(substream);
177 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
178 #define hw_ptr_error(substream, fmt, args...) \
180 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
181 xrun_log_show(substream); \
182 if (printk_ratelimit()) { \
183 snd_printd("PCM: " fmt, ##args); \
185 dump_stack_on_xrun(substream); \
189 #define XRUN_LOG_CNT 10
191 struct hwptr_log_entry {
192 unsigned long jiffies;
193 snd_pcm_uframes_t pos;
194 snd_pcm_uframes_t period_size;
195 snd_pcm_uframes_t buffer_size;
196 snd_pcm_uframes_t old_hw_ptr;
197 snd_pcm_uframes_t hw_ptr_base;
200 struct snd_pcm_hwptr_log {
203 struct hwptr_log_entry entries[XRUN_LOG_CNT];
206 static void xrun_log(struct snd_pcm_substream *substream,
207 snd_pcm_uframes_t pos)
209 struct snd_pcm_runtime *runtime = substream->runtime;
210 struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
211 struct hwptr_log_entry *entry;
214 log = kzalloc(sizeof(*log), GFP_ATOMIC);
217 runtime->hwptr_log = log;
219 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
222 entry = &log->entries[log->idx];
223 entry->jiffies = jiffies;
225 entry->period_size = runtime->period_size;
226 entry->buffer_size = runtime->buffer_size;
227 entry->old_hw_ptr = runtime->status->hw_ptr;
228 entry->hw_ptr_base = runtime->hw_ptr_base;
229 log->idx = (log->idx + 1) % XRUN_LOG_CNT;
232 static void xrun_log_show(struct snd_pcm_substream *substream)
234 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
235 struct hwptr_log_entry *entry;
242 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
244 pcm_debug_name(substream, name, sizeof(name));
245 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
246 entry = &log->entries[idx];
247 if (entry->period_size == 0)
249 snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
251 name, entry->jiffies, (unsigned long)entry->pos,
252 (unsigned long)entry->period_size,
253 (unsigned long)entry->buffer_size,
254 (unsigned long)entry->old_hw_ptr,
255 (unsigned long)entry->hw_ptr_base);
262 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
264 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
265 #define xrun_log(substream, pos) do { } while (0)
266 #define xrun_log_show(substream) do { } while (0)
270 int snd_pcm_update_state(struct snd_pcm_substream *substream,
271 struct snd_pcm_runtime *runtime)
273 snd_pcm_uframes_t avail;
275 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
276 avail = snd_pcm_playback_avail(runtime);
278 avail = snd_pcm_capture_avail(runtime);
279 if (avail > runtime->avail_max)
280 runtime->avail_max = avail;
281 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
282 if (avail >= runtime->buffer_size) {
283 snd_pcm_drain_done(substream);
287 if (avail >= runtime->stop_threshold) {
292 if (runtime->twake) {
293 if (avail >= runtime->twake)
294 wake_up(&runtime->tsleep);
295 } else if (avail >= runtime->control->avail_min)
296 wake_up(&runtime->sleep);
300 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
301 unsigned int in_interrupt)
303 struct snd_pcm_runtime *runtime = substream->runtime;
304 snd_pcm_uframes_t pos;
305 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
306 snd_pcm_sframes_t hdelta, delta;
307 unsigned long jdelta;
309 old_hw_ptr = runtime->status->hw_ptr;
310 pos = substream->ops->pointer(substream);
311 if (pos == SNDRV_PCM_POS_XRUN) {
315 if (pos >= runtime->buffer_size) {
316 if (printk_ratelimit()) {
318 pcm_debug_name(substream, name, sizeof(name));
319 xrun_log_show(substream);
320 snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
321 "buffer size = %ld, period size = %ld\n",
322 name, pos, runtime->buffer_size,
323 runtime->period_size);
327 pos -= pos % runtime->min_align;
328 if (xrun_debug(substream, XRUN_DEBUG_LOG))
329 xrun_log(substream, pos);
330 hw_base = runtime->hw_ptr_base;
331 new_hw_ptr = hw_base + pos;
333 /* we know that one period was processed */
334 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
335 delta = runtime->hw_ptr_interrupt + runtime->period_size;
336 if (delta > new_hw_ptr) {
337 /* check for double acknowledged interrupts */
338 hdelta = jiffies - runtime->hw_ptr_jiffies;
339 if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
340 hw_base += runtime->buffer_size;
341 if (hw_base >= runtime->boundary)
343 new_hw_ptr = hw_base + pos;
348 /* new_hw_ptr might be lower than old_hw_ptr in case when */
349 /* pointer crosses the end of the ring buffer */
350 if (new_hw_ptr < old_hw_ptr) {
351 hw_base += runtime->buffer_size;
352 if (hw_base >= runtime->boundary)
354 new_hw_ptr = hw_base + pos;
357 delta = new_hw_ptr - old_hw_ptr;
359 delta += runtime->boundary;
360 if (xrun_debug(substream, in_interrupt ?
361 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
363 pcm_debug_name(substream, name, sizeof(name));
364 snd_printd("%s_update: %s: pos=%u/%u/%u, "
365 "hwptr=%ld/%ld/%ld/%ld\n",
366 in_interrupt ? "period" : "hwptr",
369 (unsigned int)runtime->period_size,
370 (unsigned int)runtime->buffer_size,
371 (unsigned long)delta,
372 (unsigned long)old_hw_ptr,
373 (unsigned long)new_hw_ptr,
374 (unsigned long)runtime->hw_ptr_base);
377 if (runtime->no_period_wakeup) {
378 snd_pcm_sframes_t xrun_threshold;
380 * Without regular period interrupts, we have to check
381 * the elapsed time to detect xruns.
383 jdelta = jiffies - runtime->hw_ptr_jiffies;
384 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
386 hdelta = jdelta - delta * HZ / runtime->rate;
387 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
388 while (hdelta > xrun_threshold) {
389 delta += runtime->buffer_size;
390 hw_base += runtime->buffer_size;
391 if (hw_base >= runtime->boundary)
393 new_hw_ptr = hw_base + pos;
394 hdelta -= runtime->hw_ptr_buffer_jiffies;
399 /* something must be really wrong */
400 if (delta >= runtime->buffer_size + runtime->period_size) {
401 hw_ptr_error(substream,
402 "Unexpected hw_pointer value %s"
403 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
405 in_interrupt ? "[Q] " : "[P]",
406 substream->stream, (long)pos,
407 (long)new_hw_ptr, (long)old_hw_ptr);
411 /* Do jiffies check only in xrun_debug mode */
412 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
413 goto no_jiffies_check;
415 /* Skip the jiffies check for hardwares with BATCH flag.
416 * Such hardware usually just increases the position at each IRQ,
417 * thus it can't give any strange position.
419 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
420 goto no_jiffies_check;
422 if (hdelta < runtime->delay)
423 goto no_jiffies_check;
424 hdelta -= runtime->delay;
425 jdelta = jiffies - runtime->hw_ptr_jiffies;
426 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
428 (((runtime->period_size * HZ) / runtime->rate)
430 /* move new_hw_ptr according jiffies not pos variable */
431 new_hw_ptr = old_hw_ptr;
433 /* use loop to avoid checks for delta overflows */
434 /* the delta value is small or zero in most cases */
436 new_hw_ptr += runtime->period_size;
437 if (new_hw_ptr >= runtime->boundary)
438 new_hw_ptr -= runtime->boundary;
441 /* align hw_base to buffer_size */
442 hw_ptr_error(substream,
443 "hw_ptr skipping! %s"
444 "(pos=%ld, delta=%ld, period=%ld, "
445 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
446 in_interrupt ? "[Q] " : "",
447 (long)pos, (long)hdelta,
448 (long)runtime->period_size, jdelta,
449 ((hdelta * HZ) / runtime->rate), hw_base,
450 (unsigned long)old_hw_ptr,
451 (unsigned long)new_hw_ptr);
452 /* reset values to proper state */
454 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
457 if (delta > runtime->period_size + runtime->period_size / 2) {
458 hw_ptr_error(substream,
459 "Lost interrupts? %s"
460 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
462 in_interrupt ? "[Q] " : "",
463 substream->stream, (long)delta,
469 if (runtime->status->hw_ptr == new_hw_ptr)
472 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
473 runtime->silence_size > 0)
474 snd_pcm_playback_silence(substream, new_hw_ptr);
477 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
479 delta += runtime->boundary;
480 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
481 runtime->hw_ptr_interrupt += delta;
482 if (runtime->hw_ptr_interrupt >= runtime->boundary)
483 runtime->hw_ptr_interrupt -= runtime->boundary;
485 runtime->hw_ptr_base = hw_base;
486 runtime->status->hw_ptr = new_hw_ptr;
487 runtime->hw_ptr_jiffies = jiffies;
488 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
489 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
491 return snd_pcm_update_state(substream, runtime);
494 /* CAUTION: call it with irq disabled */
495 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
497 return snd_pcm_update_hw_ptr0(substream, 0);
501 * snd_pcm_set_ops - set the PCM operators
502 * @pcm: the pcm instance
503 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
504 * @ops: the operator table
506 * Sets the given PCM operators to the pcm instance.
508 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
510 struct snd_pcm_str *stream = &pcm->streams[direction];
511 struct snd_pcm_substream *substream;
513 for (substream = stream->substream; substream != NULL; substream = substream->next)
514 substream->ops = ops;
517 EXPORT_SYMBOL(snd_pcm_set_ops);
520 * snd_pcm_sync - set the PCM sync id
521 * @substream: the pcm substream
523 * Sets the PCM sync identifier for the card.
525 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
527 struct snd_pcm_runtime *runtime = substream->runtime;
529 runtime->sync.id32[0] = substream->pcm->card->number;
530 runtime->sync.id32[1] = -1;
531 runtime->sync.id32[2] = -1;
532 runtime->sync.id32[3] = -1;
535 EXPORT_SYMBOL(snd_pcm_set_sync);
538 * Standard ioctl routine
541 static inline unsigned int div32(unsigned int a, unsigned int b,
552 static inline unsigned int div_down(unsigned int a, unsigned int b)
559 static inline unsigned int div_up(unsigned int a, unsigned int b)
571 static inline unsigned int mul(unsigned int a, unsigned int b)
575 if (div_down(UINT_MAX, a) < b)
580 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
581 unsigned int c, unsigned int *r)
583 u_int64_t n = (u_int64_t) a * b;
589 n = div_u64_rem(n, c, r);
598 * snd_interval_refine - refine the interval value of configurator
599 * @i: the interval value to refine
600 * @v: the interval value to refer to
602 * Refines the interval value with the reference value.
603 * The interval is changed to the range satisfying both intervals.
604 * The interval status (min, max, integer, etc.) are evaluated.
606 * Returns non-zero if the value is changed, zero if not changed.
608 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
611 if (snd_BUG_ON(snd_interval_empty(i)))
613 if (i->min < v->min) {
615 i->openmin = v->openmin;
617 } else if (i->min == v->min && !i->openmin && v->openmin) {
621 if (i->max > v->max) {
623 i->openmax = v->openmax;
625 } else if (i->max == v->max && !i->openmax && v->openmax) {
629 if (!i->integer && v->integer) {
642 } else if (!i->openmin && !i->openmax && i->min == i->max)
644 if (snd_interval_checkempty(i)) {
645 snd_interval_none(i);
651 EXPORT_SYMBOL(snd_interval_refine);
653 static int snd_interval_refine_first(struct snd_interval *i)
655 if (snd_BUG_ON(snd_interval_empty(i)))
657 if (snd_interval_single(i))
660 i->openmax = i->openmin;
666 static int snd_interval_refine_last(struct snd_interval *i)
668 if (snd_BUG_ON(snd_interval_empty(i)))
670 if (snd_interval_single(i))
673 i->openmin = i->openmax;
679 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
681 if (a->empty || b->empty) {
682 snd_interval_none(c);
686 c->min = mul(a->min, b->min);
687 c->openmin = (a->openmin || b->openmin);
688 c->max = mul(a->max, b->max);
689 c->openmax = (a->openmax || b->openmax);
690 c->integer = (a->integer && b->integer);
694 * snd_interval_div - refine the interval value with division
701 * Returns non-zero if the value is changed, zero if not changed.
703 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
706 if (a->empty || b->empty) {
707 snd_interval_none(c);
711 c->min = div32(a->min, b->max, &r);
712 c->openmin = (r || a->openmin || b->openmax);
714 c->max = div32(a->max, b->min, &r);
719 c->openmax = (a->openmax || b->openmin);
728 * snd_interval_muldivk - refine the interval value
731 * @k: divisor (as integer)
736 * Returns non-zero if the value is changed, zero if not changed.
738 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
739 unsigned int k, struct snd_interval *c)
742 if (a->empty || b->empty) {
743 snd_interval_none(c);
747 c->min = muldiv32(a->min, b->min, k, &r);
748 c->openmin = (r || a->openmin || b->openmin);
749 c->max = muldiv32(a->max, b->max, k, &r);
754 c->openmax = (a->openmax || b->openmax);
759 * snd_interval_mulkdiv - refine the interval value
761 * @k: dividend 2 (as integer)
767 * Returns non-zero if the value is changed, zero if not changed.
769 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
770 const struct snd_interval *b, struct snd_interval *c)
773 if (a->empty || b->empty) {
774 snd_interval_none(c);
778 c->min = muldiv32(a->min, k, b->max, &r);
779 c->openmin = (r || a->openmin || b->openmax);
781 c->max = muldiv32(a->max, k, b->min, &r);
786 c->openmax = (a->openmax || b->openmin);
798 * snd_interval_ratnum - refine the interval value
799 * @i: interval to refine
800 * @rats_count: number of ratnum_t
801 * @rats: ratnum_t array
802 * @nump: pointer to store the resultant numerator
803 * @denp: pointer to store the resultant denominator
805 * Returns non-zero if the value is changed, zero if not changed.
807 int snd_interval_ratnum(struct snd_interval *i,
808 unsigned int rats_count, struct snd_ratnum *rats,
809 unsigned int *nump, unsigned int *denp)
811 unsigned int best_num, best_den;
814 struct snd_interval t;
816 unsigned int result_num, result_den;
819 best_num = best_den = best_diff = 0;
820 for (k = 0; k < rats_count; ++k) {
821 unsigned int num = rats[k].num;
823 unsigned int q = i->min;
827 den = div_up(num, q);
828 if (den < rats[k].den_min)
830 if (den > rats[k].den_max)
831 den = rats[k].den_max;
834 r = (den - rats[k].den_min) % rats[k].den_step;
838 diff = num - q * den;
842 diff * best_den < best_diff * den) {
852 t.min = div_down(best_num, best_den);
853 t.openmin = !!(best_num % best_den);
855 result_num = best_num;
856 result_diff = best_diff;
857 result_den = best_den;
858 best_num = best_den = best_diff = 0;
859 for (k = 0; k < rats_count; ++k) {
860 unsigned int num = rats[k].num;
862 unsigned int q = i->max;
868 den = div_down(num, q);
869 if (den > rats[k].den_max)
871 if (den < rats[k].den_min)
872 den = rats[k].den_min;
875 r = (den - rats[k].den_min) % rats[k].den_step;
877 den += rats[k].den_step - r;
879 diff = q * den - num;
883 diff * best_den < best_diff * den) {
893 t.max = div_up(best_num, best_den);
894 t.openmax = !!(best_num % best_den);
896 err = snd_interval_refine(i, &t);
900 if (snd_interval_single(i)) {
901 if (best_diff * result_den < result_diff * best_den) {
902 result_num = best_num;
903 result_den = best_den;
913 EXPORT_SYMBOL(snd_interval_ratnum);
916 * snd_interval_ratden - refine the interval value
917 * @i: interval to refine
918 * @rats_count: number of struct ratden
919 * @rats: struct ratden array
920 * @nump: pointer to store the resultant numerator
921 * @denp: pointer to store the resultant denominator
923 * Returns non-zero if the value is changed, zero if not changed.
925 static int snd_interval_ratden(struct snd_interval *i,
926 unsigned int rats_count, struct snd_ratden *rats,
927 unsigned int *nump, unsigned int *denp)
929 unsigned int best_num, best_diff, best_den;
931 struct snd_interval t;
934 best_num = best_den = best_diff = 0;
935 for (k = 0; k < rats_count; ++k) {
937 unsigned int den = rats[k].den;
938 unsigned int q = i->min;
941 if (num > rats[k].num_max)
943 if (num < rats[k].num_min)
944 num = rats[k].num_max;
947 r = (num - rats[k].num_min) % rats[k].num_step;
949 num += rats[k].num_step - r;
951 diff = num - q * den;
953 diff * best_den < best_diff * den) {
963 t.min = div_down(best_num, best_den);
964 t.openmin = !!(best_num % best_den);
966 best_num = best_den = best_diff = 0;
967 for (k = 0; k < rats_count; ++k) {
969 unsigned int den = rats[k].den;
970 unsigned int q = i->max;
973 if (num < rats[k].num_min)
975 if (num > rats[k].num_max)
976 num = rats[k].num_max;
979 r = (num - rats[k].num_min) % rats[k].num_step;
983 diff = q * den - num;
985 diff * best_den < best_diff * den) {
995 t.max = div_up(best_num, best_den);
996 t.openmax = !!(best_num % best_den);
998 err = snd_interval_refine(i, &t);
1002 if (snd_interval_single(i)) {
1012 * snd_interval_list - refine the interval value from the list
1013 * @i: the interval value to refine
1014 * @count: the number of elements in the list
1015 * @list: the value list
1016 * @mask: the bit-mask to evaluate
1018 * Refines the interval value from the list.
1019 * When mask is non-zero, only the elements corresponding to bit 1 are
1022 * Returns non-zero if the value is changed, zero if not changed.
1024 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
1027 struct snd_interval list_range;
1033 snd_interval_any(&list_range);
1034 list_range.min = UINT_MAX;
1036 for (k = 0; k < count; k++) {
1037 if (mask && !(mask & (1 << k)))
1039 if (!snd_interval_test(i, list[k]))
1041 list_range.min = min(list_range.min, list[k]);
1042 list_range.max = max(list_range.max, list[k]);
1044 return snd_interval_refine(i, &list_range);
1047 EXPORT_SYMBOL(snd_interval_list);
1049 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1053 n = (i->min - min) % step;
1054 if (n != 0 || i->openmin) {
1058 n = (i->max - min) % step;
1059 if (n != 0 || i->openmax) {
1063 if (snd_interval_checkempty(i)) {
1070 /* Info constraints helpers */
1073 * snd_pcm_hw_rule_add - add the hw-constraint rule
1074 * @runtime: the pcm runtime instance
1075 * @cond: condition bits
1076 * @var: the variable to evaluate
1077 * @func: the evaluation function
1078 * @private: the private data pointer passed to function
1079 * @dep: the dependent variables
1081 * Returns zero if successful, or a negative error code on failure.
1083 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1085 snd_pcm_hw_rule_func_t func, void *private,
1088 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1089 struct snd_pcm_hw_rule *c;
1092 va_start(args, dep);
1093 if (constrs->rules_num >= constrs->rules_all) {
1094 struct snd_pcm_hw_rule *new;
1095 unsigned int new_rules = constrs->rules_all + 16;
1096 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1101 if (constrs->rules) {
1102 memcpy(new, constrs->rules,
1103 constrs->rules_num * sizeof(*c));
1104 kfree(constrs->rules);
1106 constrs->rules = new;
1107 constrs->rules_all = new_rules;
1109 c = &constrs->rules[constrs->rules_num];
1113 c->private = private;
1116 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1123 dep = va_arg(args, int);
1125 constrs->rules_num++;
1130 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1133 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1134 * @runtime: PCM runtime instance
1135 * @var: hw_params variable to apply the mask
1136 * @mask: the bitmap mask
1138 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1140 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1143 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1144 struct snd_mask *maskp = constrs_mask(constrs, var);
1145 *maskp->bits &= mask;
1146 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1147 if (*maskp->bits == 0)
1153 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1154 * @runtime: PCM runtime instance
1155 * @var: hw_params variable to apply the mask
1156 * @mask: the 64bit bitmap mask
1158 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1160 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1163 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1164 struct snd_mask *maskp = constrs_mask(constrs, var);
1165 maskp->bits[0] &= (u_int32_t)mask;
1166 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1167 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1168 if (! maskp->bits[0] && ! maskp->bits[1])
1174 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1175 * @runtime: PCM runtime instance
1176 * @var: hw_params variable to apply the integer constraint
1178 * Apply the constraint of integer to an interval parameter.
1180 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1182 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1183 return snd_interval_setinteger(constrs_interval(constrs, var));
1186 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1189 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1190 * @runtime: PCM runtime instance
1191 * @var: hw_params variable to apply the range
1192 * @min: the minimal value
1193 * @max: the maximal value
1195 * Apply the min/max range constraint to an interval parameter.
1197 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1198 unsigned int min, unsigned int max)
1200 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1201 struct snd_interval t;
1204 t.openmin = t.openmax = 0;
1206 return snd_interval_refine(constrs_interval(constrs, var), &t);
1209 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1211 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1212 struct snd_pcm_hw_rule *rule)
1214 struct snd_pcm_hw_constraint_list *list = rule->private;
1215 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1220 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1221 * @runtime: PCM runtime instance
1222 * @cond: condition bits
1223 * @var: hw_params variable to apply the list constraint
1226 * Apply the list of constraints to an interval parameter.
1228 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1230 snd_pcm_hw_param_t var,
1231 struct snd_pcm_hw_constraint_list *l)
1233 return snd_pcm_hw_rule_add(runtime, cond, var,
1234 snd_pcm_hw_rule_list, l,
1238 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1240 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1241 struct snd_pcm_hw_rule *rule)
1243 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1244 unsigned int num = 0, den = 0;
1246 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1247 r->nrats, r->rats, &num, &den);
1248 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1249 params->rate_num = num;
1250 params->rate_den = den;
1256 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1257 * @runtime: PCM runtime instance
1258 * @cond: condition bits
1259 * @var: hw_params variable to apply the ratnums constraint
1260 * @r: struct snd_ratnums constriants
1262 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1264 snd_pcm_hw_param_t var,
1265 struct snd_pcm_hw_constraint_ratnums *r)
1267 return snd_pcm_hw_rule_add(runtime, cond, var,
1268 snd_pcm_hw_rule_ratnums, r,
1272 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1274 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1275 struct snd_pcm_hw_rule *rule)
1277 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1278 unsigned int num = 0, den = 0;
1279 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1280 r->nrats, r->rats, &num, &den);
1281 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1282 params->rate_num = num;
1283 params->rate_den = den;
1289 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1290 * @runtime: PCM runtime instance
1291 * @cond: condition bits
1292 * @var: hw_params variable to apply the ratdens constraint
1293 * @r: struct snd_ratdens constriants
1295 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1297 snd_pcm_hw_param_t var,
1298 struct snd_pcm_hw_constraint_ratdens *r)
1300 return snd_pcm_hw_rule_add(runtime, cond, var,
1301 snd_pcm_hw_rule_ratdens, r,
1305 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1307 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1308 struct snd_pcm_hw_rule *rule)
1310 unsigned int l = (unsigned long) rule->private;
1311 int width = l & 0xffff;
1312 unsigned int msbits = l >> 16;
1313 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1314 if (snd_interval_single(i) && snd_interval_value(i) == width)
1315 params->msbits = msbits;
1320 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1321 * @runtime: PCM runtime instance
1322 * @cond: condition bits
1323 * @width: sample bits width
1324 * @msbits: msbits width
1326 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1329 unsigned int msbits)
1331 unsigned long l = (msbits << 16) | width;
1332 return snd_pcm_hw_rule_add(runtime, cond, -1,
1333 snd_pcm_hw_rule_msbits,
1335 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1338 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1340 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1341 struct snd_pcm_hw_rule *rule)
1343 unsigned long step = (unsigned long) rule->private;
1344 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1348 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1349 * @runtime: PCM runtime instance
1350 * @cond: condition bits
1351 * @var: hw_params variable to apply the step constraint
1354 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1356 snd_pcm_hw_param_t var,
1359 return snd_pcm_hw_rule_add(runtime, cond, var,
1360 snd_pcm_hw_rule_step, (void *) step,
1364 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1366 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1368 static unsigned int pow2_sizes[] = {
1369 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1370 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1371 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1372 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1374 return snd_interval_list(hw_param_interval(params, rule->var),
1375 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1379 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1380 * @runtime: PCM runtime instance
1381 * @cond: condition bits
1382 * @var: hw_params variable to apply the power-of-2 constraint
1384 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1386 snd_pcm_hw_param_t var)
1388 return snd_pcm_hw_rule_add(runtime, cond, var,
1389 snd_pcm_hw_rule_pow2, NULL,
1393 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1395 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1396 snd_pcm_hw_param_t var)
1398 if (hw_is_mask(var)) {
1399 snd_mask_any(hw_param_mask(params, var));
1400 params->cmask |= 1 << var;
1401 params->rmask |= 1 << var;
1404 if (hw_is_interval(var)) {
1405 snd_interval_any(hw_param_interval(params, var));
1406 params->cmask |= 1 << var;
1407 params->rmask |= 1 << var;
1413 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1416 memset(params, 0, sizeof(*params));
1417 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1418 _snd_pcm_hw_param_any(params, k);
1419 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1420 _snd_pcm_hw_param_any(params, k);
1424 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1427 * snd_pcm_hw_param_value - return @params field @var value
1428 * @params: the hw_params instance
1429 * @var: parameter to retrieve
1430 * @dir: pointer to the direction (-1,0,1) or %NULL
1432 * Return the value for field @var if it's fixed in configuration space
1433 * defined by @params. Return -%EINVAL otherwise.
1435 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1436 snd_pcm_hw_param_t var, int *dir)
1438 if (hw_is_mask(var)) {
1439 const struct snd_mask *mask = hw_param_mask_c(params, var);
1440 if (!snd_mask_single(mask))
1444 return snd_mask_value(mask);
1446 if (hw_is_interval(var)) {
1447 const struct snd_interval *i = hw_param_interval_c(params, var);
1448 if (!snd_interval_single(i))
1452 return snd_interval_value(i);
1457 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1459 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1460 snd_pcm_hw_param_t var)
1462 if (hw_is_mask(var)) {
1463 snd_mask_none(hw_param_mask(params, var));
1464 params->cmask |= 1 << var;
1465 params->rmask |= 1 << var;
1466 } else if (hw_is_interval(var)) {
1467 snd_interval_none(hw_param_interval(params, var));
1468 params->cmask |= 1 << var;
1469 params->rmask |= 1 << var;
1475 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1477 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1478 snd_pcm_hw_param_t var)
1481 if (hw_is_mask(var))
1482 changed = snd_mask_refine_first(hw_param_mask(params, var));
1483 else if (hw_is_interval(var))
1484 changed = snd_interval_refine_first(hw_param_interval(params, var));
1488 params->cmask |= 1 << var;
1489 params->rmask |= 1 << var;
1496 * snd_pcm_hw_param_first - refine config space and return minimum value
1497 * @pcm: PCM instance
1498 * @params: the hw_params instance
1499 * @var: parameter to retrieve
1500 * @dir: pointer to the direction (-1,0,1) or %NULL
1502 * Inside configuration space defined by @params remove from @var all
1503 * values > minimum. Reduce configuration space accordingly.
1504 * Return the minimum.
1506 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1507 struct snd_pcm_hw_params *params,
1508 snd_pcm_hw_param_t var, int *dir)
1510 int changed = _snd_pcm_hw_param_first(params, var);
1513 if (params->rmask) {
1514 int err = snd_pcm_hw_refine(pcm, params);
1515 if (snd_BUG_ON(err < 0))
1518 return snd_pcm_hw_param_value(params, var, dir);
1521 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1523 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1524 snd_pcm_hw_param_t var)
1527 if (hw_is_mask(var))
1528 changed = snd_mask_refine_last(hw_param_mask(params, var));
1529 else if (hw_is_interval(var))
1530 changed = snd_interval_refine_last(hw_param_interval(params, var));
1534 params->cmask |= 1 << var;
1535 params->rmask |= 1 << var;
1542 * snd_pcm_hw_param_last - refine config space and return maximum value
1543 * @pcm: PCM instance
1544 * @params: the hw_params instance
1545 * @var: parameter to retrieve
1546 * @dir: pointer to the direction (-1,0,1) or %NULL
1548 * Inside configuration space defined by @params remove from @var all
1549 * values < maximum. Reduce configuration space accordingly.
1550 * Return the maximum.
1552 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1553 struct snd_pcm_hw_params *params,
1554 snd_pcm_hw_param_t var, int *dir)
1556 int changed = _snd_pcm_hw_param_last(params, var);
1559 if (params->rmask) {
1560 int err = snd_pcm_hw_refine(pcm, params);
1561 if (snd_BUG_ON(err < 0))
1564 return snd_pcm_hw_param_value(params, var, dir);
1567 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1570 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1571 * @pcm: PCM instance
1572 * @params: the hw_params instance
1574 * Choose one configuration from configuration space defined by @params.
1575 * The configuration chosen is that obtained fixing in this order:
1576 * first access, first format, first subformat, min channels,
1577 * min rate, min period time, max buffer size, min tick time
1579 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1580 struct snd_pcm_hw_params *params)
1582 static int vars[] = {
1583 SNDRV_PCM_HW_PARAM_ACCESS,
1584 SNDRV_PCM_HW_PARAM_FORMAT,
1585 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1586 SNDRV_PCM_HW_PARAM_CHANNELS,
1587 SNDRV_PCM_HW_PARAM_RATE,
1588 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1589 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1590 SNDRV_PCM_HW_PARAM_TICK_TIME,
1595 for (v = vars; *v != -1; v++) {
1596 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1597 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1599 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1600 if (snd_BUG_ON(err < 0))
1606 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1609 struct snd_pcm_runtime *runtime = substream->runtime;
1610 unsigned long flags;
1611 snd_pcm_stream_lock_irqsave(substream, flags);
1612 if (snd_pcm_running(substream) &&
1613 snd_pcm_update_hw_ptr(substream) >= 0)
1614 runtime->status->hw_ptr %= runtime->buffer_size;
1616 runtime->status->hw_ptr = 0;
1617 snd_pcm_stream_unlock_irqrestore(substream, flags);
1621 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1624 struct snd_pcm_channel_info *info = arg;
1625 struct snd_pcm_runtime *runtime = substream->runtime;
1627 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1631 width = snd_pcm_format_physical_width(runtime->format);
1635 switch (runtime->access) {
1636 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1637 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1638 info->first = info->channel * width;
1639 info->step = runtime->channels * width;
1641 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1642 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1644 size_t size = runtime->dma_bytes / runtime->channels;
1645 info->first = info->channel * size * 8;
1656 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1659 struct snd_pcm_hw_params *params = arg;
1660 snd_pcm_format_t format;
1661 int channels, width;
1663 params->fifo_size = substream->runtime->hw.fifo_size;
1664 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1665 format = params_format(params);
1666 channels = params_channels(params);
1667 width = snd_pcm_format_physical_width(format);
1668 params->fifo_size /= width * channels;
1674 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1675 * @substream: the pcm substream instance
1676 * @cmd: ioctl command
1677 * @arg: ioctl argument
1679 * Processes the generic ioctl commands for PCM.
1680 * Can be passed as the ioctl callback for PCM ops.
1682 * Returns zero if successful, or a negative error code on failure.
1684 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1685 unsigned int cmd, void *arg)
1688 case SNDRV_PCM_IOCTL1_INFO:
1690 case SNDRV_PCM_IOCTL1_RESET:
1691 return snd_pcm_lib_ioctl_reset(substream, arg);
1692 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1693 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1694 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1695 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1700 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1703 * snd_pcm_period_elapsed - update the pcm status for the next period
1704 * @substream: the pcm substream instance
1706 * This function is called from the interrupt handler when the
1707 * PCM has processed the period size. It will update the current
1708 * pointer, wake up sleepers, etc.
1710 * Even if more than one periods have elapsed since the last call, you
1711 * have to call this only once.
1713 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1715 struct snd_pcm_runtime *runtime;
1716 unsigned long flags;
1718 if (PCM_RUNTIME_CHECK(substream))
1720 runtime = substream->runtime;
1722 if (runtime->transfer_ack_begin)
1723 runtime->transfer_ack_begin(substream);
1725 snd_pcm_stream_lock_irqsave(substream, flags);
1726 if (!snd_pcm_running(substream) ||
1727 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1730 if (substream->timer_running)
1731 snd_timer_interrupt(substream->timer, 1);
1733 snd_pcm_stream_unlock_irqrestore(substream, flags);
1734 if (runtime->transfer_ack_end)
1735 runtime->transfer_ack_end(substream);
1736 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1739 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1742 * Wait until avail_min data becomes available
1743 * Returns a negative error code if any error occurs during operation.
1744 * The available space is stored on availp. When err = 0 and avail = 0
1745 * on the capture stream, it indicates the stream is in DRAINING state.
1747 static int wait_for_avail(struct snd_pcm_substream *substream,
1748 snd_pcm_uframes_t *availp)
1750 struct snd_pcm_runtime *runtime = substream->runtime;
1751 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1754 snd_pcm_uframes_t avail = 0;
1757 init_waitqueue_entry(&wait, current);
1758 add_wait_queue(&runtime->tsleep, &wait);
1760 if (signal_pending(current)) {
1764 set_current_state(TASK_INTERRUPTIBLE);
1765 snd_pcm_stream_unlock_irq(substream);
1766 tout = schedule_timeout(msecs_to_jiffies(10000));
1767 snd_pcm_stream_lock_irq(substream);
1768 switch (runtime->status->state) {
1769 case SNDRV_PCM_STATE_SUSPENDED:
1772 case SNDRV_PCM_STATE_XRUN:
1775 case SNDRV_PCM_STATE_DRAINING:
1779 avail = 0; /* indicate draining */
1781 case SNDRV_PCM_STATE_OPEN:
1782 case SNDRV_PCM_STATE_SETUP:
1783 case SNDRV_PCM_STATE_DISCONNECTED:
1788 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1789 is_playback ? "playback" : "capture");
1794 avail = snd_pcm_playback_avail(runtime);
1796 avail = snd_pcm_capture_avail(runtime);
1797 if (avail >= runtime->twake)
1801 remove_wait_queue(&runtime->tsleep, &wait);
1806 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1808 unsigned long data, unsigned int off,
1809 snd_pcm_uframes_t frames)
1811 struct snd_pcm_runtime *runtime = substream->runtime;
1813 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1814 if (substream->ops->copy) {
1815 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1818 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1819 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1825 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1826 unsigned long data, unsigned int off,
1827 snd_pcm_uframes_t size);
1829 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1831 snd_pcm_uframes_t size,
1833 transfer_f transfer)
1835 struct snd_pcm_runtime *runtime = substream->runtime;
1836 snd_pcm_uframes_t xfer = 0;
1837 snd_pcm_uframes_t offset = 0;
1843 snd_pcm_stream_lock_irq(substream);
1844 switch (runtime->status->state) {
1845 case SNDRV_PCM_STATE_PREPARED:
1846 case SNDRV_PCM_STATE_RUNNING:
1847 case SNDRV_PCM_STATE_PAUSED:
1849 case SNDRV_PCM_STATE_XRUN:
1852 case SNDRV_PCM_STATE_SUSPENDED:
1860 runtime->twake = runtime->control->avail_min ? : 1;
1862 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1863 snd_pcm_uframes_t avail;
1864 snd_pcm_uframes_t cont;
1865 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1866 snd_pcm_update_hw_ptr(substream);
1867 avail = snd_pcm_playback_avail(runtime);
1873 runtime->twake = min_t(snd_pcm_uframes_t, size,
1874 runtime->control->avail_min ? : 1);
1875 err = wait_for_avail(substream, &avail);
1879 frames = size > avail ? avail : size;
1880 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1883 if (snd_BUG_ON(!frames)) {
1885 snd_pcm_stream_unlock_irq(substream);
1888 appl_ptr = runtime->control->appl_ptr;
1889 appl_ofs = appl_ptr % runtime->buffer_size;
1890 snd_pcm_stream_unlock_irq(substream);
1891 err = transfer(substream, appl_ofs, data, offset, frames);
1892 snd_pcm_stream_lock_irq(substream);
1895 switch (runtime->status->state) {
1896 case SNDRV_PCM_STATE_XRUN:
1899 case SNDRV_PCM_STATE_SUSPENDED:
1906 if (appl_ptr >= runtime->boundary)
1907 appl_ptr -= runtime->boundary;
1908 runtime->control->appl_ptr = appl_ptr;
1909 if (substream->ops->ack)
1910 substream->ops->ack(substream);
1915 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1916 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1917 err = snd_pcm_start(substream);
1924 if (xfer > 0 && err >= 0)
1925 snd_pcm_update_state(substream, runtime);
1926 snd_pcm_stream_unlock_irq(substream);
1927 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1930 /* sanity-check for read/write methods */
1931 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1933 struct snd_pcm_runtime *runtime;
1934 if (PCM_RUNTIME_CHECK(substream))
1936 runtime = substream->runtime;
1937 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1939 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1944 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1946 struct snd_pcm_runtime *runtime;
1950 err = pcm_sanity_check(substream);
1953 runtime = substream->runtime;
1954 nonblock = !!(substream->f_flags & O_NONBLOCK);
1956 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1957 runtime->channels > 1)
1959 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1960 snd_pcm_lib_write_transfer);
1963 EXPORT_SYMBOL(snd_pcm_lib_write);
1965 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1967 unsigned long data, unsigned int off,
1968 snd_pcm_uframes_t frames)
1970 struct snd_pcm_runtime *runtime = substream->runtime;
1972 void __user **bufs = (void __user **)data;
1973 int channels = runtime->channels;
1975 if (substream->ops->copy) {
1976 if (snd_BUG_ON(!substream->ops->silence))
1978 for (c = 0; c < channels; ++c, ++bufs) {
1979 if (*bufs == NULL) {
1980 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1983 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1984 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1989 /* default transfer behaviour */
1990 size_t dma_csize = runtime->dma_bytes / channels;
1991 for (c = 0; c < channels; ++c, ++bufs) {
1992 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1993 if (*bufs == NULL) {
1994 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1996 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1997 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2005 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2007 snd_pcm_uframes_t frames)
2009 struct snd_pcm_runtime *runtime;
2013 err = pcm_sanity_check(substream);
2016 runtime = substream->runtime;
2017 nonblock = !!(substream->f_flags & O_NONBLOCK);
2019 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2021 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2022 nonblock, snd_pcm_lib_writev_transfer);
2025 EXPORT_SYMBOL(snd_pcm_lib_writev);
2027 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2029 unsigned long data, unsigned int off,
2030 snd_pcm_uframes_t frames)
2032 struct snd_pcm_runtime *runtime = substream->runtime;
2034 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2035 if (substream->ops->copy) {
2036 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2039 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2040 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2046 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2048 snd_pcm_uframes_t size,
2050 transfer_f transfer)
2052 struct snd_pcm_runtime *runtime = substream->runtime;
2053 snd_pcm_uframes_t xfer = 0;
2054 snd_pcm_uframes_t offset = 0;
2060 snd_pcm_stream_lock_irq(substream);
2061 switch (runtime->status->state) {
2062 case SNDRV_PCM_STATE_PREPARED:
2063 if (size >= runtime->start_threshold) {
2064 err = snd_pcm_start(substream);
2069 case SNDRV_PCM_STATE_DRAINING:
2070 case SNDRV_PCM_STATE_RUNNING:
2071 case SNDRV_PCM_STATE_PAUSED:
2073 case SNDRV_PCM_STATE_XRUN:
2076 case SNDRV_PCM_STATE_SUSPENDED:
2084 runtime->twake = runtime->control->avail_min ? : 1;
2086 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2087 snd_pcm_uframes_t avail;
2088 snd_pcm_uframes_t cont;
2089 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2090 snd_pcm_update_hw_ptr(substream);
2091 avail = snd_pcm_capture_avail(runtime);
2093 if (runtime->status->state ==
2094 SNDRV_PCM_STATE_DRAINING) {
2095 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2102 runtime->twake = min_t(snd_pcm_uframes_t, size,
2103 runtime->control->avail_min ? : 1);
2104 err = wait_for_avail(substream, &avail);
2108 continue; /* draining */
2110 frames = size > avail ? avail : size;
2111 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2114 if (snd_BUG_ON(!frames)) {
2116 snd_pcm_stream_unlock_irq(substream);
2119 appl_ptr = runtime->control->appl_ptr;
2120 appl_ofs = appl_ptr % runtime->buffer_size;
2121 snd_pcm_stream_unlock_irq(substream);
2122 err = transfer(substream, appl_ofs, data, offset, frames);
2123 snd_pcm_stream_lock_irq(substream);
2126 switch (runtime->status->state) {
2127 case SNDRV_PCM_STATE_XRUN:
2130 case SNDRV_PCM_STATE_SUSPENDED:
2137 if (appl_ptr >= runtime->boundary)
2138 appl_ptr -= runtime->boundary;
2139 runtime->control->appl_ptr = appl_ptr;
2140 if (substream->ops->ack)
2141 substream->ops->ack(substream);
2149 if (xfer > 0 && err >= 0)
2150 snd_pcm_update_state(substream, runtime);
2151 snd_pcm_stream_unlock_irq(substream);
2152 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2155 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2157 struct snd_pcm_runtime *runtime;
2161 err = pcm_sanity_check(substream);
2164 runtime = substream->runtime;
2165 nonblock = !!(substream->f_flags & O_NONBLOCK);
2166 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2168 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2171 EXPORT_SYMBOL(snd_pcm_lib_read);
2173 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2175 unsigned long data, unsigned int off,
2176 snd_pcm_uframes_t frames)
2178 struct snd_pcm_runtime *runtime = substream->runtime;
2180 void __user **bufs = (void __user **)data;
2181 int channels = runtime->channels;
2183 if (substream->ops->copy) {
2184 for (c = 0; c < channels; ++c, ++bufs) {
2188 buf = *bufs + samples_to_bytes(runtime, off);
2189 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2193 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2194 for (c = 0; c < channels; ++c, ++bufs) {
2200 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2201 buf = *bufs + samples_to_bytes(runtime, off);
2202 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2209 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2211 snd_pcm_uframes_t frames)
2213 struct snd_pcm_runtime *runtime;
2217 err = pcm_sanity_check(substream);
2220 runtime = substream->runtime;
2221 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2224 nonblock = !!(substream->f_flags & O_NONBLOCK);
2225 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2227 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2230 EXPORT_SYMBOL(snd_pcm_lib_readv);