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 runtime->silence_filled = avail > 0 ? avail : 0;
71 runtime->silence_start = (runtime->status->hw_ptr +
72 runtime->silence_filled) %
75 ofs = runtime->status->hw_ptr;
76 frames = new_hw_ptr - ofs;
77 if ((snd_pcm_sframes_t)frames < 0)
78 frames += runtime->boundary;
79 runtime->silence_filled -= frames;
80 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
81 runtime->silence_filled = 0;
82 runtime->silence_start = new_hw_ptr;
84 runtime->silence_start = ofs;
87 frames = runtime->buffer_size - runtime->silence_filled;
89 if (snd_BUG_ON(frames > runtime->buffer_size))
93 ofs = runtime->silence_start % runtime->buffer_size;
95 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
96 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
97 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
98 if (substream->ops->silence) {
100 err = substream->ops->silence(substream, -1, ofs, transfer);
103 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
104 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
108 unsigned int channels = runtime->channels;
109 if (substream->ops->silence) {
110 for (c = 0; c < channels; ++c) {
112 err = substream->ops->silence(substream, c, ofs, transfer);
116 size_t dma_csize = runtime->dma_bytes / channels;
117 for (c = 0; c < channels; ++c) {
118 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
119 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
123 runtime->silence_filled += transfer;
129 static void pcm_debug_name(struct snd_pcm_substream *substream,
130 char *name, size_t len)
132 snprintf(name, len, "pcmC%dD%d%c:%d",
133 substream->pcm->card->number,
134 substream->pcm->device,
135 substream->stream ? 'c' : 'p',
139 #define XRUN_DEBUG_BASIC (1<<0)
140 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
141 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
142 #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
143 #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
144 #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
145 #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
147 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
149 #define xrun_debug(substream, mask) \
150 ((substream)->pstr->xrun_debug & (mask))
152 #define xrun_debug(substream, mask) 0
155 #define dump_stack_on_xrun(substream) do { \
156 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
160 static void xrun(struct snd_pcm_substream *substream)
162 struct snd_pcm_runtime *runtime = substream->runtime;
164 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
165 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
166 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
167 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
169 pcm_debug_name(substream, name, sizeof(name));
170 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
171 dump_stack_on_xrun(substream);
175 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
176 #define hw_ptr_error(substream, fmt, args...) \
178 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
179 xrun_log_show(substream); \
180 if (printk_ratelimit()) { \
181 snd_printd("PCM: " fmt, ##args); \
183 dump_stack_on_xrun(substream); \
187 #define XRUN_LOG_CNT 10
189 struct hwptr_log_entry {
190 unsigned long jiffies;
191 snd_pcm_uframes_t pos;
192 snd_pcm_uframes_t period_size;
193 snd_pcm_uframes_t buffer_size;
194 snd_pcm_uframes_t old_hw_ptr;
195 snd_pcm_uframes_t hw_ptr_base;
198 struct snd_pcm_hwptr_log {
201 struct hwptr_log_entry entries[XRUN_LOG_CNT];
204 static void xrun_log(struct snd_pcm_substream *substream,
205 snd_pcm_uframes_t pos)
207 struct snd_pcm_runtime *runtime = substream->runtime;
208 struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
209 struct hwptr_log_entry *entry;
212 log = kzalloc(sizeof(*log), GFP_ATOMIC);
215 runtime->hwptr_log = log;
217 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
220 entry = &log->entries[log->idx];
221 entry->jiffies = jiffies;
223 entry->period_size = runtime->period_size;
224 entry->buffer_size = runtime->buffer_size;;
225 entry->old_hw_ptr = runtime->status->hw_ptr;
226 entry->hw_ptr_base = runtime->hw_ptr_base;
227 log->idx = (log->idx + 1) % XRUN_LOG_CNT;
230 static void xrun_log_show(struct snd_pcm_substream *substream)
232 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
233 struct hwptr_log_entry *entry;
240 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
242 pcm_debug_name(substream, name, sizeof(name));
243 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
244 entry = &log->entries[idx];
245 if (entry->period_size == 0)
247 snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
249 name, entry->jiffies, (unsigned long)entry->pos,
250 (unsigned long)entry->period_size,
251 (unsigned long)entry->buffer_size,
252 (unsigned long)entry->old_hw_ptr,
253 (unsigned long)entry->hw_ptr_base);
260 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
262 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
263 #define xrun_log(substream, pos) do { } while (0)
264 #define xrun_log_show(substream) do { } while (0)
268 int snd_pcm_update_state(struct snd_pcm_substream *substream,
269 struct snd_pcm_runtime *runtime)
271 snd_pcm_uframes_t avail;
273 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
274 avail = snd_pcm_playback_avail(runtime);
276 avail = snd_pcm_capture_avail(runtime);
277 if (avail > runtime->avail_max)
278 runtime->avail_max = avail;
279 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
280 if (avail >= runtime->buffer_size) {
281 snd_pcm_drain_done(substream);
285 if (avail >= runtime->stop_threshold) {
290 if (avail >= runtime->control->avail_min)
291 wake_up(runtime->twake ? &runtime->tsleep : &runtime->sleep);
295 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
296 unsigned int in_interrupt)
298 struct snd_pcm_runtime *runtime = substream->runtime;
299 snd_pcm_uframes_t pos;
300 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
301 snd_pcm_sframes_t hdelta, delta;
302 unsigned long jdelta;
304 old_hw_ptr = runtime->status->hw_ptr;
305 pos = substream->ops->pointer(substream);
306 if (pos == SNDRV_PCM_POS_XRUN) {
310 if (pos >= runtime->buffer_size) {
311 if (printk_ratelimit()) {
313 pcm_debug_name(substream, name, sizeof(name));
314 xrun_log_show(substream);
315 snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
316 "buffer size = %ld, period size = %ld\n",
317 name, pos, runtime->buffer_size,
318 runtime->period_size);
322 pos -= pos % runtime->min_align;
323 if (xrun_debug(substream, XRUN_DEBUG_LOG))
324 xrun_log(substream, pos);
325 hw_base = runtime->hw_ptr_base;
326 new_hw_ptr = hw_base + pos;
328 /* we know that one period was processed */
329 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
330 delta = runtime->hw_ptr_interrupt + runtime->period_size;
331 if (delta > new_hw_ptr) {
332 hw_base += runtime->buffer_size;
333 if (hw_base >= runtime->boundary)
335 new_hw_ptr = hw_base + pos;
339 /* new_hw_ptr might be lower than old_hw_ptr in case when */
340 /* pointer crosses the end of the ring buffer */
341 if (new_hw_ptr < old_hw_ptr) {
342 hw_base += runtime->buffer_size;
343 if (hw_base >= runtime->boundary)
345 new_hw_ptr = hw_base + pos;
348 delta = new_hw_ptr - old_hw_ptr;
350 delta += runtime->boundary;
351 if (xrun_debug(substream, in_interrupt ?
352 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
354 pcm_debug_name(substream, name, sizeof(name));
355 snd_printd("%s_update: %s: pos=%u/%u/%u, "
356 "hwptr=%ld/%ld/%ld/%ld\n",
357 in_interrupt ? "period" : "hwptr",
360 (unsigned int)runtime->period_size,
361 (unsigned int)runtime->buffer_size,
362 (unsigned long)delta,
363 (unsigned long)old_hw_ptr,
364 (unsigned long)new_hw_ptr,
365 (unsigned long)runtime->hw_ptr_base);
367 /* something must be really wrong */
368 if (delta >= runtime->buffer_size + runtime->period_size) {
369 hw_ptr_error(substream,
370 "Unexpected hw_pointer value %s"
371 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
373 in_interrupt ? "[Q] " : "[P]",
374 substream->stream, (long)pos,
375 (long)new_hw_ptr, (long)old_hw_ptr);
379 /* Do jiffies check only in xrun_debug mode */
380 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
381 goto no_jiffies_check;
383 /* Skip the jiffies check for hardwares with BATCH flag.
384 * Such hardware usually just increases the position at each IRQ,
385 * thus it can't give any strange position.
387 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
388 goto no_jiffies_check;
390 if (hdelta < runtime->delay)
391 goto no_jiffies_check;
392 hdelta -= runtime->delay;
393 jdelta = jiffies - runtime->hw_ptr_jiffies;
394 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
396 (((runtime->period_size * HZ) / runtime->rate)
398 /* move new_hw_ptr according jiffies not pos variable */
399 new_hw_ptr = old_hw_ptr;
401 /* use loop to avoid checks for delta overflows */
402 /* the delta value is small or zero in most cases */
404 new_hw_ptr += runtime->period_size;
405 if (new_hw_ptr >= runtime->boundary)
406 new_hw_ptr -= runtime->boundary;
409 /* align hw_base to buffer_size */
410 hw_ptr_error(substream,
411 "hw_ptr skipping! %s"
412 "(pos=%ld, delta=%ld, period=%ld, "
413 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
414 in_interrupt ? "[Q] " : "",
415 (long)pos, (long)hdelta,
416 (long)runtime->period_size, jdelta,
417 ((hdelta * HZ) / runtime->rate), hw_base,
418 (unsigned long)old_hw_ptr,
419 (unsigned long)new_hw_ptr);
420 /* reset values to proper state */
422 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
425 if (delta > runtime->period_size + runtime->period_size / 2) {
426 hw_ptr_error(substream,
427 "Lost interrupts? %s"
428 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
430 in_interrupt ? "[Q] " : "",
431 substream->stream, (long)delta,
436 if (runtime->status->hw_ptr == new_hw_ptr)
439 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
440 runtime->silence_size > 0)
441 snd_pcm_playback_silence(substream, new_hw_ptr);
444 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
446 delta += runtime->boundary;
447 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
448 runtime->hw_ptr_interrupt += delta;
449 if (runtime->hw_ptr_interrupt >= runtime->boundary)
450 runtime->hw_ptr_interrupt -= runtime->boundary;
452 runtime->hw_ptr_base = hw_base;
453 runtime->status->hw_ptr = new_hw_ptr;
454 runtime->hw_ptr_jiffies = jiffies;
455 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
456 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
458 return snd_pcm_update_state(substream, runtime);
461 /* CAUTION: call it with irq disabled */
462 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
464 return snd_pcm_update_hw_ptr0(substream, 0);
468 * snd_pcm_set_ops - set the PCM operators
469 * @pcm: the pcm instance
470 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
471 * @ops: the operator table
473 * Sets the given PCM operators to the pcm instance.
475 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
477 struct snd_pcm_str *stream = &pcm->streams[direction];
478 struct snd_pcm_substream *substream;
480 for (substream = stream->substream; substream != NULL; substream = substream->next)
481 substream->ops = ops;
484 EXPORT_SYMBOL(snd_pcm_set_ops);
487 * snd_pcm_sync - set the PCM sync id
488 * @substream: the pcm substream
490 * Sets the PCM sync identifier for the card.
492 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
494 struct snd_pcm_runtime *runtime = substream->runtime;
496 runtime->sync.id32[0] = substream->pcm->card->number;
497 runtime->sync.id32[1] = -1;
498 runtime->sync.id32[2] = -1;
499 runtime->sync.id32[3] = -1;
502 EXPORT_SYMBOL(snd_pcm_set_sync);
505 * Standard ioctl routine
508 static inline unsigned int div32(unsigned int a, unsigned int b,
519 static inline unsigned int div_down(unsigned int a, unsigned int b)
526 static inline unsigned int div_up(unsigned int a, unsigned int b)
538 static inline unsigned int mul(unsigned int a, unsigned int b)
542 if (div_down(UINT_MAX, a) < b)
547 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
548 unsigned int c, unsigned int *r)
550 u_int64_t n = (u_int64_t) a * b;
556 n = div_u64_rem(n, c, r);
565 * snd_interval_refine - refine the interval value of configurator
566 * @i: the interval value to refine
567 * @v: the interval value to refer to
569 * Refines the interval value with the reference value.
570 * The interval is changed to the range satisfying both intervals.
571 * The interval status (min, max, integer, etc.) are evaluated.
573 * Returns non-zero if the value is changed, zero if not changed.
575 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
578 if (snd_BUG_ON(snd_interval_empty(i)))
580 if (i->min < v->min) {
582 i->openmin = v->openmin;
584 } else if (i->min == v->min && !i->openmin && v->openmin) {
588 if (i->max > v->max) {
590 i->openmax = v->openmax;
592 } else if (i->max == v->max && !i->openmax && v->openmax) {
596 if (!i->integer && v->integer) {
609 } else if (!i->openmin && !i->openmax && i->min == i->max)
611 if (snd_interval_checkempty(i)) {
612 snd_interval_none(i);
618 EXPORT_SYMBOL(snd_interval_refine);
620 static int snd_interval_refine_first(struct snd_interval *i)
622 if (snd_BUG_ON(snd_interval_empty(i)))
624 if (snd_interval_single(i))
627 i->openmax = i->openmin;
633 static int snd_interval_refine_last(struct snd_interval *i)
635 if (snd_BUG_ON(snd_interval_empty(i)))
637 if (snd_interval_single(i))
640 i->openmin = i->openmax;
646 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
648 if (a->empty || b->empty) {
649 snd_interval_none(c);
653 c->min = mul(a->min, b->min);
654 c->openmin = (a->openmin || b->openmin);
655 c->max = mul(a->max, b->max);
656 c->openmax = (a->openmax || b->openmax);
657 c->integer = (a->integer && b->integer);
661 * snd_interval_div - refine the interval value with division
668 * Returns non-zero if the value is changed, zero if not changed.
670 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
673 if (a->empty || b->empty) {
674 snd_interval_none(c);
678 c->min = div32(a->min, b->max, &r);
679 c->openmin = (r || a->openmin || b->openmax);
681 c->max = div32(a->max, b->min, &r);
686 c->openmax = (a->openmax || b->openmin);
695 * snd_interval_muldivk - refine the interval value
698 * @k: divisor (as integer)
703 * Returns non-zero if the value is changed, zero if not changed.
705 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
706 unsigned int k, struct snd_interval *c)
709 if (a->empty || b->empty) {
710 snd_interval_none(c);
714 c->min = muldiv32(a->min, b->min, k, &r);
715 c->openmin = (r || a->openmin || b->openmin);
716 c->max = muldiv32(a->max, b->max, k, &r);
721 c->openmax = (a->openmax || b->openmax);
726 * snd_interval_mulkdiv - refine the interval value
728 * @k: dividend 2 (as integer)
734 * Returns non-zero if the value is changed, zero if not changed.
736 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
737 const struct snd_interval *b, struct snd_interval *c)
740 if (a->empty || b->empty) {
741 snd_interval_none(c);
745 c->min = muldiv32(a->min, k, b->max, &r);
746 c->openmin = (r || a->openmin || b->openmax);
748 c->max = muldiv32(a->max, k, b->min, &r);
753 c->openmax = (a->openmax || b->openmin);
765 * snd_interval_ratnum - refine the interval value
766 * @i: interval to refine
767 * @rats_count: number of ratnum_t
768 * @rats: ratnum_t array
769 * @nump: pointer to store the resultant numerator
770 * @denp: pointer to store the resultant denominator
772 * Returns non-zero if the value is changed, zero if not changed.
774 int snd_interval_ratnum(struct snd_interval *i,
775 unsigned int rats_count, struct snd_ratnum *rats,
776 unsigned int *nump, unsigned int *denp)
778 unsigned int best_num, best_den;
781 struct snd_interval t;
783 unsigned int result_num, result_den;
786 best_num = best_den = best_diff = 0;
787 for (k = 0; k < rats_count; ++k) {
788 unsigned int num = rats[k].num;
790 unsigned int q = i->min;
794 den = div_up(num, q);
795 if (den < rats[k].den_min)
797 if (den > rats[k].den_max)
798 den = rats[k].den_max;
801 r = (den - rats[k].den_min) % rats[k].den_step;
805 diff = num - q * den;
809 diff * best_den < best_diff * den) {
819 t.min = div_down(best_num, best_den);
820 t.openmin = !!(best_num % best_den);
822 result_num = best_num;
823 result_diff = best_diff;
824 result_den = best_den;
825 best_num = best_den = best_diff = 0;
826 for (k = 0; k < rats_count; ++k) {
827 unsigned int num = rats[k].num;
829 unsigned int q = i->max;
835 den = div_down(num, q);
836 if (den > rats[k].den_max)
838 if (den < rats[k].den_min)
839 den = rats[k].den_min;
842 r = (den - rats[k].den_min) % rats[k].den_step;
844 den += rats[k].den_step - r;
846 diff = q * den - num;
850 diff * best_den < best_diff * den) {
860 t.max = div_up(best_num, best_den);
861 t.openmax = !!(best_num % best_den);
863 err = snd_interval_refine(i, &t);
867 if (snd_interval_single(i)) {
868 if (best_diff * result_den < result_diff * best_den) {
869 result_num = best_num;
870 result_den = best_den;
880 EXPORT_SYMBOL(snd_interval_ratnum);
883 * snd_interval_ratden - refine the interval value
884 * @i: interval to refine
885 * @rats_count: number of struct ratden
886 * @rats: struct ratden array
887 * @nump: pointer to store the resultant numerator
888 * @denp: pointer to store the resultant denominator
890 * Returns non-zero if the value is changed, zero if not changed.
892 static int snd_interval_ratden(struct snd_interval *i,
893 unsigned int rats_count, struct snd_ratden *rats,
894 unsigned int *nump, unsigned int *denp)
896 unsigned int best_num, best_diff, best_den;
898 struct snd_interval t;
901 best_num = best_den = best_diff = 0;
902 for (k = 0; k < rats_count; ++k) {
904 unsigned int den = rats[k].den;
905 unsigned int q = i->min;
908 if (num > rats[k].num_max)
910 if (num < rats[k].num_min)
911 num = rats[k].num_max;
914 r = (num - rats[k].num_min) % rats[k].num_step;
916 num += rats[k].num_step - r;
918 diff = num - q * den;
920 diff * best_den < best_diff * den) {
930 t.min = div_down(best_num, best_den);
931 t.openmin = !!(best_num % best_den);
933 best_num = best_den = best_diff = 0;
934 for (k = 0; k < rats_count; ++k) {
936 unsigned int den = rats[k].den;
937 unsigned int q = i->max;
940 if (num < rats[k].num_min)
942 if (num > rats[k].num_max)
943 num = rats[k].num_max;
946 r = (num - rats[k].num_min) % rats[k].num_step;
950 diff = q * den - num;
952 diff * best_den < best_diff * den) {
962 t.max = div_up(best_num, best_den);
963 t.openmax = !!(best_num % best_den);
965 err = snd_interval_refine(i, &t);
969 if (snd_interval_single(i)) {
979 * snd_interval_list - refine the interval value from the list
980 * @i: the interval value to refine
981 * @count: the number of elements in the list
982 * @list: the value list
983 * @mask: the bit-mask to evaluate
985 * Refines the interval value from the list.
986 * When mask is non-zero, only the elements corresponding to bit 1 are
989 * Returns non-zero if the value is changed, zero if not changed.
991 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
994 struct snd_interval list_range;
1000 snd_interval_any(&list_range);
1001 list_range.min = UINT_MAX;
1003 for (k = 0; k < count; k++) {
1004 if (mask && !(mask & (1 << k)))
1006 if (!snd_interval_test(i, list[k]))
1008 list_range.min = min(list_range.min, list[k]);
1009 list_range.max = max(list_range.max, list[k]);
1011 return snd_interval_refine(i, &list_range);
1014 EXPORT_SYMBOL(snd_interval_list);
1016 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1020 n = (i->min - min) % step;
1021 if (n != 0 || i->openmin) {
1025 n = (i->max - min) % step;
1026 if (n != 0 || i->openmax) {
1030 if (snd_interval_checkempty(i)) {
1037 /* Info constraints helpers */
1040 * snd_pcm_hw_rule_add - add the hw-constraint rule
1041 * @runtime: the pcm runtime instance
1042 * @cond: condition bits
1043 * @var: the variable to evaluate
1044 * @func: the evaluation function
1045 * @private: the private data pointer passed to function
1046 * @dep: the dependent variables
1048 * Returns zero if successful, or a negative error code on failure.
1050 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1052 snd_pcm_hw_rule_func_t func, void *private,
1055 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1056 struct snd_pcm_hw_rule *c;
1059 va_start(args, dep);
1060 if (constrs->rules_num >= constrs->rules_all) {
1061 struct snd_pcm_hw_rule *new;
1062 unsigned int new_rules = constrs->rules_all + 16;
1063 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1066 if (constrs->rules) {
1067 memcpy(new, constrs->rules,
1068 constrs->rules_num * sizeof(*c));
1069 kfree(constrs->rules);
1071 constrs->rules = new;
1072 constrs->rules_all = new_rules;
1074 c = &constrs->rules[constrs->rules_num];
1078 c->private = private;
1081 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
1086 dep = va_arg(args, int);
1088 constrs->rules_num++;
1093 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1096 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1097 * @runtime: PCM runtime instance
1098 * @var: hw_params variable to apply the mask
1099 * @mask: the bitmap mask
1101 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1103 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1106 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1107 struct snd_mask *maskp = constrs_mask(constrs, var);
1108 *maskp->bits &= mask;
1109 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1110 if (*maskp->bits == 0)
1116 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1117 * @runtime: PCM runtime instance
1118 * @var: hw_params variable to apply the mask
1119 * @mask: the 64bit bitmap mask
1121 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1123 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1126 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1127 struct snd_mask *maskp = constrs_mask(constrs, var);
1128 maskp->bits[0] &= (u_int32_t)mask;
1129 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1130 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1131 if (! maskp->bits[0] && ! maskp->bits[1])
1137 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1138 * @runtime: PCM runtime instance
1139 * @var: hw_params variable to apply the integer constraint
1141 * Apply the constraint of integer to an interval parameter.
1143 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1145 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1146 return snd_interval_setinteger(constrs_interval(constrs, var));
1149 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1152 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1153 * @runtime: PCM runtime instance
1154 * @var: hw_params variable to apply the range
1155 * @min: the minimal value
1156 * @max: the maximal value
1158 * Apply the min/max range constraint to an interval parameter.
1160 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1161 unsigned int min, unsigned int max)
1163 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1164 struct snd_interval t;
1167 t.openmin = t.openmax = 0;
1169 return snd_interval_refine(constrs_interval(constrs, var), &t);
1172 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1174 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1175 struct snd_pcm_hw_rule *rule)
1177 struct snd_pcm_hw_constraint_list *list = rule->private;
1178 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1183 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1184 * @runtime: PCM runtime instance
1185 * @cond: condition bits
1186 * @var: hw_params variable to apply the list constraint
1189 * Apply the list of constraints to an interval parameter.
1191 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1193 snd_pcm_hw_param_t var,
1194 struct snd_pcm_hw_constraint_list *l)
1196 return snd_pcm_hw_rule_add(runtime, cond, var,
1197 snd_pcm_hw_rule_list, l,
1201 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1203 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1204 struct snd_pcm_hw_rule *rule)
1206 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1207 unsigned int num = 0, den = 0;
1209 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1210 r->nrats, r->rats, &num, &den);
1211 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1212 params->rate_num = num;
1213 params->rate_den = den;
1219 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1220 * @runtime: PCM runtime instance
1221 * @cond: condition bits
1222 * @var: hw_params variable to apply the ratnums constraint
1223 * @r: struct snd_ratnums constriants
1225 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1227 snd_pcm_hw_param_t var,
1228 struct snd_pcm_hw_constraint_ratnums *r)
1230 return snd_pcm_hw_rule_add(runtime, cond, var,
1231 snd_pcm_hw_rule_ratnums, r,
1235 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1237 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1238 struct snd_pcm_hw_rule *rule)
1240 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1241 unsigned int num = 0, den = 0;
1242 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1243 r->nrats, r->rats, &num, &den);
1244 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1245 params->rate_num = num;
1246 params->rate_den = den;
1252 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1253 * @runtime: PCM runtime instance
1254 * @cond: condition bits
1255 * @var: hw_params variable to apply the ratdens constraint
1256 * @r: struct snd_ratdens constriants
1258 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1260 snd_pcm_hw_param_t var,
1261 struct snd_pcm_hw_constraint_ratdens *r)
1263 return snd_pcm_hw_rule_add(runtime, cond, var,
1264 snd_pcm_hw_rule_ratdens, r,
1268 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1270 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1271 struct snd_pcm_hw_rule *rule)
1273 unsigned int l = (unsigned long) rule->private;
1274 int width = l & 0xffff;
1275 unsigned int msbits = l >> 16;
1276 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1277 if (snd_interval_single(i) && snd_interval_value(i) == width)
1278 params->msbits = msbits;
1283 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1284 * @runtime: PCM runtime instance
1285 * @cond: condition bits
1286 * @width: sample bits width
1287 * @msbits: msbits width
1289 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1292 unsigned int msbits)
1294 unsigned long l = (msbits << 16) | width;
1295 return snd_pcm_hw_rule_add(runtime, cond, -1,
1296 snd_pcm_hw_rule_msbits,
1298 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1301 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1303 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1304 struct snd_pcm_hw_rule *rule)
1306 unsigned long step = (unsigned long) rule->private;
1307 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1311 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1312 * @runtime: PCM runtime instance
1313 * @cond: condition bits
1314 * @var: hw_params variable to apply the step constraint
1317 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1319 snd_pcm_hw_param_t var,
1322 return snd_pcm_hw_rule_add(runtime, cond, var,
1323 snd_pcm_hw_rule_step, (void *) step,
1327 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1329 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1331 static unsigned int pow2_sizes[] = {
1332 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1333 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1334 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1335 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1337 return snd_interval_list(hw_param_interval(params, rule->var),
1338 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1342 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1343 * @runtime: PCM runtime instance
1344 * @cond: condition bits
1345 * @var: hw_params variable to apply the power-of-2 constraint
1347 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1349 snd_pcm_hw_param_t var)
1351 return snd_pcm_hw_rule_add(runtime, cond, var,
1352 snd_pcm_hw_rule_pow2, NULL,
1356 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1358 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1359 snd_pcm_hw_param_t var)
1361 if (hw_is_mask(var)) {
1362 snd_mask_any(hw_param_mask(params, var));
1363 params->cmask |= 1 << var;
1364 params->rmask |= 1 << var;
1367 if (hw_is_interval(var)) {
1368 snd_interval_any(hw_param_interval(params, var));
1369 params->cmask |= 1 << var;
1370 params->rmask |= 1 << var;
1376 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1379 memset(params, 0, sizeof(*params));
1380 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1381 _snd_pcm_hw_param_any(params, k);
1382 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1383 _snd_pcm_hw_param_any(params, k);
1387 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1390 * snd_pcm_hw_param_value - return @params field @var value
1391 * @params: the hw_params instance
1392 * @var: parameter to retrieve
1393 * @dir: pointer to the direction (-1,0,1) or %NULL
1395 * Return the value for field @var if it's fixed in configuration space
1396 * defined by @params. Return -%EINVAL otherwise.
1398 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1399 snd_pcm_hw_param_t var, int *dir)
1401 if (hw_is_mask(var)) {
1402 const struct snd_mask *mask = hw_param_mask_c(params, var);
1403 if (!snd_mask_single(mask))
1407 return snd_mask_value(mask);
1409 if (hw_is_interval(var)) {
1410 const struct snd_interval *i = hw_param_interval_c(params, var);
1411 if (!snd_interval_single(i))
1415 return snd_interval_value(i);
1420 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1422 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1423 snd_pcm_hw_param_t var)
1425 if (hw_is_mask(var)) {
1426 snd_mask_none(hw_param_mask(params, var));
1427 params->cmask |= 1 << var;
1428 params->rmask |= 1 << var;
1429 } else if (hw_is_interval(var)) {
1430 snd_interval_none(hw_param_interval(params, var));
1431 params->cmask |= 1 << var;
1432 params->rmask |= 1 << var;
1438 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1440 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1441 snd_pcm_hw_param_t var)
1444 if (hw_is_mask(var))
1445 changed = snd_mask_refine_first(hw_param_mask(params, var));
1446 else if (hw_is_interval(var))
1447 changed = snd_interval_refine_first(hw_param_interval(params, var));
1451 params->cmask |= 1 << var;
1452 params->rmask |= 1 << var;
1459 * snd_pcm_hw_param_first - refine config space and return minimum value
1460 * @pcm: PCM instance
1461 * @params: the hw_params instance
1462 * @var: parameter to retrieve
1463 * @dir: pointer to the direction (-1,0,1) or %NULL
1465 * Inside configuration space defined by @params remove from @var all
1466 * values > minimum. Reduce configuration space accordingly.
1467 * Return the minimum.
1469 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1470 struct snd_pcm_hw_params *params,
1471 snd_pcm_hw_param_t var, int *dir)
1473 int changed = _snd_pcm_hw_param_first(params, var);
1476 if (params->rmask) {
1477 int err = snd_pcm_hw_refine(pcm, params);
1478 if (snd_BUG_ON(err < 0))
1481 return snd_pcm_hw_param_value(params, var, dir);
1484 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1486 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1487 snd_pcm_hw_param_t var)
1490 if (hw_is_mask(var))
1491 changed = snd_mask_refine_last(hw_param_mask(params, var));
1492 else if (hw_is_interval(var))
1493 changed = snd_interval_refine_last(hw_param_interval(params, var));
1497 params->cmask |= 1 << var;
1498 params->rmask |= 1 << var;
1505 * snd_pcm_hw_param_last - refine config space and return maximum value
1506 * @pcm: PCM instance
1507 * @params: the hw_params instance
1508 * @var: parameter to retrieve
1509 * @dir: pointer to the direction (-1,0,1) or %NULL
1511 * Inside configuration space defined by @params remove from @var all
1512 * values < maximum. Reduce configuration space accordingly.
1513 * Return the maximum.
1515 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1516 struct snd_pcm_hw_params *params,
1517 snd_pcm_hw_param_t var, int *dir)
1519 int changed = _snd_pcm_hw_param_last(params, var);
1522 if (params->rmask) {
1523 int err = snd_pcm_hw_refine(pcm, params);
1524 if (snd_BUG_ON(err < 0))
1527 return snd_pcm_hw_param_value(params, var, dir);
1530 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1533 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1534 * @pcm: PCM instance
1535 * @params: the hw_params instance
1537 * Choose one configuration from configuration space defined by @params.
1538 * The configuration chosen is that obtained fixing in this order:
1539 * first access, first format, first subformat, min channels,
1540 * min rate, min period time, max buffer size, min tick time
1542 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1543 struct snd_pcm_hw_params *params)
1545 static int vars[] = {
1546 SNDRV_PCM_HW_PARAM_ACCESS,
1547 SNDRV_PCM_HW_PARAM_FORMAT,
1548 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1549 SNDRV_PCM_HW_PARAM_CHANNELS,
1550 SNDRV_PCM_HW_PARAM_RATE,
1551 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1552 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1553 SNDRV_PCM_HW_PARAM_TICK_TIME,
1558 for (v = vars; *v != -1; v++) {
1559 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1560 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1562 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1563 if (snd_BUG_ON(err < 0))
1569 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1572 struct snd_pcm_runtime *runtime = substream->runtime;
1573 unsigned long flags;
1574 snd_pcm_stream_lock_irqsave(substream, flags);
1575 if (snd_pcm_running(substream) &&
1576 snd_pcm_update_hw_ptr(substream) >= 0)
1577 runtime->status->hw_ptr %= runtime->buffer_size;
1579 runtime->status->hw_ptr = 0;
1580 snd_pcm_stream_unlock_irqrestore(substream, flags);
1584 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1587 struct snd_pcm_channel_info *info = arg;
1588 struct snd_pcm_runtime *runtime = substream->runtime;
1590 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1594 width = snd_pcm_format_physical_width(runtime->format);
1598 switch (runtime->access) {
1599 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1600 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1601 info->first = info->channel * width;
1602 info->step = runtime->channels * width;
1604 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1605 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1607 size_t size = runtime->dma_bytes / runtime->channels;
1608 info->first = info->channel * size * 8;
1619 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1622 struct snd_pcm_hw_params *params = arg;
1623 snd_pcm_format_t format;
1624 int channels, width;
1626 params->fifo_size = substream->runtime->hw.fifo_size;
1627 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1628 format = params_format(params);
1629 channels = params_channels(params);
1630 width = snd_pcm_format_physical_width(format);
1631 params->fifo_size /= width * channels;
1637 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1638 * @substream: the pcm substream instance
1639 * @cmd: ioctl command
1640 * @arg: ioctl argument
1642 * Processes the generic ioctl commands for PCM.
1643 * Can be passed as the ioctl callback for PCM ops.
1645 * Returns zero if successful, or a negative error code on failure.
1647 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1648 unsigned int cmd, void *arg)
1651 case SNDRV_PCM_IOCTL1_INFO:
1653 case SNDRV_PCM_IOCTL1_RESET:
1654 return snd_pcm_lib_ioctl_reset(substream, arg);
1655 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1656 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1657 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1658 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1663 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1666 * snd_pcm_period_elapsed - update the pcm status for the next period
1667 * @substream: the pcm substream instance
1669 * This function is called from the interrupt handler when the
1670 * PCM has processed the period size. It will update the current
1671 * pointer, wake up sleepers, etc.
1673 * Even if more than one periods have elapsed since the last call, you
1674 * have to call this only once.
1676 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1678 struct snd_pcm_runtime *runtime;
1679 unsigned long flags;
1681 if (PCM_RUNTIME_CHECK(substream))
1683 runtime = substream->runtime;
1685 if (runtime->transfer_ack_begin)
1686 runtime->transfer_ack_begin(substream);
1688 snd_pcm_stream_lock_irqsave(substream, flags);
1689 if (!snd_pcm_running(substream) ||
1690 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1693 if (substream->timer_running)
1694 snd_timer_interrupt(substream->timer, 1);
1696 snd_pcm_stream_unlock_irqrestore(substream, flags);
1697 if (runtime->transfer_ack_end)
1698 runtime->transfer_ack_end(substream);
1699 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1702 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1705 * Wait until avail_min data becomes available
1706 * Returns a negative error code if any error occurs during operation.
1707 * The available space is stored on availp. When err = 0 and avail = 0
1708 * on the capture stream, it indicates the stream is in DRAINING state.
1710 static int wait_for_avail_min(struct snd_pcm_substream *substream,
1711 snd_pcm_uframes_t *availp)
1713 struct snd_pcm_runtime *runtime = substream->runtime;
1714 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1717 snd_pcm_uframes_t avail = 0;
1720 init_waitqueue_entry(&wait, current);
1721 add_wait_queue(&runtime->tsleep, &wait);
1723 if (signal_pending(current)) {
1727 set_current_state(TASK_INTERRUPTIBLE);
1728 snd_pcm_stream_unlock_irq(substream);
1729 tout = schedule_timeout(msecs_to_jiffies(10000));
1730 snd_pcm_stream_lock_irq(substream);
1731 switch (runtime->status->state) {
1732 case SNDRV_PCM_STATE_SUSPENDED:
1735 case SNDRV_PCM_STATE_XRUN:
1738 case SNDRV_PCM_STATE_DRAINING:
1742 avail = 0; /* indicate draining */
1744 case SNDRV_PCM_STATE_OPEN:
1745 case SNDRV_PCM_STATE_SETUP:
1746 case SNDRV_PCM_STATE_DISCONNECTED:
1751 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1752 is_playback ? "playback" : "capture");
1757 avail = snd_pcm_playback_avail(runtime);
1759 avail = snd_pcm_capture_avail(runtime);
1760 if (avail >= runtime->control->avail_min)
1764 remove_wait_queue(&runtime->tsleep, &wait);
1769 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1771 unsigned long data, unsigned int off,
1772 snd_pcm_uframes_t frames)
1774 struct snd_pcm_runtime *runtime = substream->runtime;
1776 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1777 if (substream->ops->copy) {
1778 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1781 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1782 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1788 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1789 unsigned long data, unsigned int off,
1790 snd_pcm_uframes_t size);
1792 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1794 snd_pcm_uframes_t size,
1796 transfer_f transfer)
1798 struct snd_pcm_runtime *runtime = substream->runtime;
1799 snd_pcm_uframes_t xfer = 0;
1800 snd_pcm_uframes_t offset = 0;
1806 snd_pcm_stream_lock_irq(substream);
1807 switch (runtime->status->state) {
1808 case SNDRV_PCM_STATE_PREPARED:
1809 case SNDRV_PCM_STATE_RUNNING:
1810 case SNDRV_PCM_STATE_PAUSED:
1812 case SNDRV_PCM_STATE_XRUN:
1815 case SNDRV_PCM_STATE_SUSPENDED:
1825 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1826 snd_pcm_uframes_t avail;
1827 snd_pcm_uframes_t cont;
1828 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1829 snd_pcm_update_hw_ptr(substream);
1830 avail = snd_pcm_playback_avail(runtime);
1836 err = wait_for_avail_min(substream, &avail);
1840 frames = size > avail ? avail : size;
1841 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1844 if (snd_BUG_ON(!frames)) {
1846 snd_pcm_stream_unlock_irq(substream);
1849 appl_ptr = runtime->control->appl_ptr;
1850 appl_ofs = appl_ptr % runtime->buffer_size;
1851 snd_pcm_stream_unlock_irq(substream);
1852 err = transfer(substream, appl_ofs, data, offset, frames);
1853 snd_pcm_stream_lock_irq(substream);
1856 switch (runtime->status->state) {
1857 case SNDRV_PCM_STATE_XRUN:
1860 case SNDRV_PCM_STATE_SUSPENDED:
1867 if (appl_ptr >= runtime->boundary)
1868 appl_ptr -= runtime->boundary;
1869 runtime->control->appl_ptr = appl_ptr;
1870 if (substream->ops->ack)
1871 substream->ops->ack(substream);
1876 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1877 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1878 err = snd_pcm_start(substream);
1885 if (xfer > 0 && err >= 0)
1886 snd_pcm_update_state(substream, runtime);
1887 snd_pcm_stream_unlock_irq(substream);
1888 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1891 /* sanity-check for read/write methods */
1892 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1894 struct snd_pcm_runtime *runtime;
1895 if (PCM_RUNTIME_CHECK(substream))
1897 runtime = substream->runtime;
1898 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1900 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1905 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1907 struct snd_pcm_runtime *runtime;
1911 err = pcm_sanity_check(substream);
1914 runtime = substream->runtime;
1915 nonblock = !!(substream->f_flags & O_NONBLOCK);
1917 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1918 runtime->channels > 1)
1920 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1921 snd_pcm_lib_write_transfer);
1924 EXPORT_SYMBOL(snd_pcm_lib_write);
1926 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1928 unsigned long data, unsigned int off,
1929 snd_pcm_uframes_t frames)
1931 struct snd_pcm_runtime *runtime = substream->runtime;
1933 void __user **bufs = (void __user **)data;
1934 int channels = runtime->channels;
1936 if (substream->ops->copy) {
1937 if (snd_BUG_ON(!substream->ops->silence))
1939 for (c = 0; c < channels; ++c, ++bufs) {
1940 if (*bufs == NULL) {
1941 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1944 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1945 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1950 /* default transfer behaviour */
1951 size_t dma_csize = runtime->dma_bytes / channels;
1952 for (c = 0; c < channels; ++c, ++bufs) {
1953 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1954 if (*bufs == NULL) {
1955 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1957 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1958 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1966 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1968 snd_pcm_uframes_t frames)
1970 struct snd_pcm_runtime *runtime;
1974 err = pcm_sanity_check(substream);
1977 runtime = substream->runtime;
1978 nonblock = !!(substream->f_flags & O_NONBLOCK);
1980 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1982 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1983 nonblock, snd_pcm_lib_writev_transfer);
1986 EXPORT_SYMBOL(snd_pcm_lib_writev);
1988 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
1990 unsigned long data, unsigned int off,
1991 snd_pcm_uframes_t frames)
1993 struct snd_pcm_runtime *runtime = substream->runtime;
1995 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1996 if (substream->ops->copy) {
1997 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2000 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2001 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2007 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2009 snd_pcm_uframes_t size,
2011 transfer_f transfer)
2013 struct snd_pcm_runtime *runtime = substream->runtime;
2014 snd_pcm_uframes_t xfer = 0;
2015 snd_pcm_uframes_t offset = 0;
2021 snd_pcm_stream_lock_irq(substream);
2022 switch (runtime->status->state) {
2023 case SNDRV_PCM_STATE_PREPARED:
2024 if (size >= runtime->start_threshold) {
2025 err = snd_pcm_start(substream);
2030 case SNDRV_PCM_STATE_DRAINING:
2031 case SNDRV_PCM_STATE_RUNNING:
2032 case SNDRV_PCM_STATE_PAUSED:
2034 case SNDRV_PCM_STATE_XRUN:
2037 case SNDRV_PCM_STATE_SUSPENDED:
2047 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2048 snd_pcm_uframes_t avail;
2049 snd_pcm_uframes_t cont;
2050 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2051 snd_pcm_update_hw_ptr(substream);
2052 avail = snd_pcm_capture_avail(runtime);
2054 if (runtime->status->state ==
2055 SNDRV_PCM_STATE_DRAINING) {
2056 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2063 err = wait_for_avail_min(substream, &avail);
2067 continue; /* draining */
2069 frames = size > avail ? avail : size;
2070 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2073 if (snd_BUG_ON(!frames)) {
2075 snd_pcm_stream_unlock_irq(substream);
2078 appl_ptr = runtime->control->appl_ptr;
2079 appl_ofs = appl_ptr % runtime->buffer_size;
2080 snd_pcm_stream_unlock_irq(substream);
2081 err = transfer(substream, appl_ofs, data, offset, frames);
2082 snd_pcm_stream_lock_irq(substream);
2085 switch (runtime->status->state) {
2086 case SNDRV_PCM_STATE_XRUN:
2089 case SNDRV_PCM_STATE_SUSPENDED:
2096 if (appl_ptr >= runtime->boundary)
2097 appl_ptr -= runtime->boundary;
2098 runtime->control->appl_ptr = appl_ptr;
2099 if (substream->ops->ack)
2100 substream->ops->ack(substream);
2108 if (xfer > 0 && err >= 0)
2109 snd_pcm_update_state(substream, runtime);
2110 snd_pcm_stream_unlock_irq(substream);
2111 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2114 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2116 struct snd_pcm_runtime *runtime;
2120 err = pcm_sanity_check(substream);
2123 runtime = substream->runtime;
2124 nonblock = !!(substream->f_flags & O_NONBLOCK);
2125 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2127 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2130 EXPORT_SYMBOL(snd_pcm_lib_read);
2132 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2134 unsigned long data, unsigned int off,
2135 snd_pcm_uframes_t frames)
2137 struct snd_pcm_runtime *runtime = substream->runtime;
2139 void __user **bufs = (void __user **)data;
2140 int channels = runtime->channels;
2142 if (substream->ops->copy) {
2143 for (c = 0; c < channels; ++c, ++bufs) {
2147 buf = *bufs + samples_to_bytes(runtime, off);
2148 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2152 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2153 for (c = 0; c < channels; ++c, ++bufs) {
2159 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2160 buf = *bufs + samples_to_bytes(runtime, off);
2161 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2168 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2170 snd_pcm_uframes_t frames)
2172 struct snd_pcm_runtime *runtime;
2176 err = pcm_sanity_check(substream);
2179 runtime = substream->runtime;
2180 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2183 nonblock = !!(substream->f_flags & O_NONBLOCK);
2184 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2186 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2189 EXPORT_SYMBOL(snd_pcm_lib_readv);