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) % runtime->boundary;
349 if (xrun_debug(substream, in_interrupt ?
350 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
352 pcm_debug_name(substream, name, sizeof(name));
353 snd_printd("%s_update: %s: pos=%u/%u/%u, "
354 "hwptr=%ld/%ld/%ld/%ld\n",
355 in_interrupt ? "period" : "hwptr",
358 (unsigned int)runtime->period_size,
359 (unsigned int)runtime->buffer_size,
360 (unsigned long)delta,
361 (unsigned long)old_hw_ptr,
362 (unsigned long)new_hw_ptr,
363 (unsigned long)runtime->hw_ptr_base);
365 /* something must be really wrong */
366 if (delta >= runtime->buffer_size + runtime->period_size) {
367 hw_ptr_error(substream,
368 "Unexpected hw_pointer value %s"
369 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
371 in_interrupt ? "[Q] " : "[P]",
372 substream->stream, (long)pos,
373 (long)new_hw_ptr, (long)old_hw_ptr);
377 /* Do jiffies check only in xrun_debug mode */
378 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
379 goto no_jiffies_check;
381 /* Skip the jiffies check for hardwares with BATCH flag.
382 * Such hardware usually just increases the position at each IRQ,
383 * thus it can't give any strange position.
385 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
386 goto no_jiffies_check;
388 if (hdelta < runtime->delay)
389 goto no_jiffies_check;
390 hdelta -= runtime->delay;
391 jdelta = jiffies - runtime->hw_ptr_jiffies;
392 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
394 (((runtime->period_size * HZ) / runtime->rate)
396 /* move new_hw_ptr according jiffies not pos variable */
397 new_hw_ptr = old_hw_ptr;
399 /* use loop to avoid checks for delta overflows */
400 /* the delta value is small or zero in most cases */
402 new_hw_ptr += runtime->period_size;
403 if (new_hw_ptr >= runtime->boundary)
404 new_hw_ptr -= runtime->boundary;
407 /* align hw_base to buffer_size */
408 hw_ptr_error(substream,
409 "hw_ptr skipping! %s"
410 "(pos=%ld, delta=%ld, period=%ld, "
411 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
412 in_interrupt ? "[Q] " : "",
413 (long)pos, (long)hdelta,
414 (long)runtime->period_size, jdelta,
415 ((hdelta * HZ) / runtime->rate), hw_base,
416 (unsigned long)old_hw_ptr,
417 (unsigned long)new_hw_ptr);
418 /* reset values to proper state */
420 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
423 if (delta > runtime->period_size + runtime->period_size / 2) {
424 hw_ptr_error(substream,
425 "Lost interrupts? %s"
426 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
428 in_interrupt ? "[Q] " : "",
429 substream->stream, (long)delta,
434 if (runtime->status->hw_ptr == new_hw_ptr)
437 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
438 runtime->silence_size > 0)
439 snd_pcm_playback_silence(substream, new_hw_ptr);
442 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
444 delta += runtime->boundary;
445 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
446 runtime->hw_ptr_interrupt += delta;
447 if (runtime->hw_ptr_interrupt >= runtime->boundary)
448 runtime->hw_ptr_interrupt -= runtime->boundary;
450 runtime->hw_ptr_base = hw_base;
451 runtime->status->hw_ptr = new_hw_ptr;
452 runtime->hw_ptr_jiffies = jiffies;
453 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
454 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
456 return snd_pcm_update_state(substream, runtime);
459 /* CAUTION: call it with irq disabled */
460 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
462 return snd_pcm_update_hw_ptr0(substream, 0);
466 * snd_pcm_set_ops - set the PCM operators
467 * @pcm: the pcm instance
468 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
469 * @ops: the operator table
471 * Sets the given PCM operators to the pcm instance.
473 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
475 struct snd_pcm_str *stream = &pcm->streams[direction];
476 struct snd_pcm_substream *substream;
478 for (substream = stream->substream; substream != NULL; substream = substream->next)
479 substream->ops = ops;
482 EXPORT_SYMBOL(snd_pcm_set_ops);
485 * snd_pcm_sync - set the PCM sync id
486 * @substream: the pcm substream
488 * Sets the PCM sync identifier for the card.
490 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
492 struct snd_pcm_runtime *runtime = substream->runtime;
494 runtime->sync.id32[0] = substream->pcm->card->number;
495 runtime->sync.id32[1] = -1;
496 runtime->sync.id32[2] = -1;
497 runtime->sync.id32[3] = -1;
500 EXPORT_SYMBOL(snd_pcm_set_sync);
503 * Standard ioctl routine
506 static inline unsigned int div32(unsigned int a, unsigned int b,
517 static inline unsigned int div_down(unsigned int a, unsigned int b)
524 static inline unsigned int div_up(unsigned int a, unsigned int b)
536 static inline unsigned int mul(unsigned int a, unsigned int b)
540 if (div_down(UINT_MAX, a) < b)
545 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
546 unsigned int c, unsigned int *r)
548 u_int64_t n = (u_int64_t) a * b;
554 n = div_u64_rem(n, c, r);
563 * snd_interval_refine - refine the interval value of configurator
564 * @i: the interval value to refine
565 * @v: the interval value to refer to
567 * Refines the interval value with the reference value.
568 * The interval is changed to the range satisfying both intervals.
569 * The interval status (min, max, integer, etc.) are evaluated.
571 * Returns non-zero if the value is changed, zero if not changed.
573 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
576 if (snd_BUG_ON(snd_interval_empty(i)))
578 if (i->min < v->min) {
580 i->openmin = v->openmin;
582 } else if (i->min == v->min && !i->openmin && v->openmin) {
586 if (i->max > v->max) {
588 i->openmax = v->openmax;
590 } else if (i->max == v->max && !i->openmax && v->openmax) {
594 if (!i->integer && v->integer) {
607 } else if (!i->openmin && !i->openmax && i->min == i->max)
609 if (snd_interval_checkempty(i)) {
610 snd_interval_none(i);
616 EXPORT_SYMBOL(snd_interval_refine);
618 static int snd_interval_refine_first(struct snd_interval *i)
620 if (snd_BUG_ON(snd_interval_empty(i)))
622 if (snd_interval_single(i))
625 i->openmax = i->openmin;
631 static int snd_interval_refine_last(struct snd_interval *i)
633 if (snd_BUG_ON(snd_interval_empty(i)))
635 if (snd_interval_single(i))
638 i->openmin = i->openmax;
644 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
646 if (a->empty || b->empty) {
647 snd_interval_none(c);
651 c->min = mul(a->min, b->min);
652 c->openmin = (a->openmin || b->openmin);
653 c->max = mul(a->max, b->max);
654 c->openmax = (a->openmax || b->openmax);
655 c->integer = (a->integer && b->integer);
659 * snd_interval_div - refine the interval value with division
666 * Returns non-zero if the value is changed, zero if not changed.
668 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
671 if (a->empty || b->empty) {
672 snd_interval_none(c);
676 c->min = div32(a->min, b->max, &r);
677 c->openmin = (r || a->openmin || b->openmax);
679 c->max = div32(a->max, b->min, &r);
684 c->openmax = (a->openmax || b->openmin);
693 * snd_interval_muldivk - refine the interval value
696 * @k: divisor (as integer)
701 * Returns non-zero if the value is changed, zero if not changed.
703 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
704 unsigned int k, struct snd_interval *c)
707 if (a->empty || b->empty) {
708 snd_interval_none(c);
712 c->min = muldiv32(a->min, b->min, k, &r);
713 c->openmin = (r || a->openmin || b->openmin);
714 c->max = muldiv32(a->max, b->max, k, &r);
719 c->openmax = (a->openmax || b->openmax);
724 * snd_interval_mulkdiv - refine the interval value
726 * @k: dividend 2 (as integer)
732 * Returns non-zero if the value is changed, zero if not changed.
734 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
735 const struct snd_interval *b, struct snd_interval *c)
738 if (a->empty || b->empty) {
739 snd_interval_none(c);
743 c->min = muldiv32(a->min, k, b->max, &r);
744 c->openmin = (r || a->openmin || b->openmax);
746 c->max = muldiv32(a->max, k, b->min, &r);
751 c->openmax = (a->openmax || b->openmin);
763 * snd_interval_ratnum - refine the interval value
764 * @i: interval to refine
765 * @rats_count: number of ratnum_t
766 * @rats: ratnum_t array
767 * @nump: pointer to store the resultant numerator
768 * @denp: pointer to store the resultant denominator
770 * Returns non-zero if the value is changed, zero if not changed.
772 int snd_interval_ratnum(struct snd_interval *i,
773 unsigned int rats_count, struct snd_ratnum *rats,
774 unsigned int *nump, unsigned int *denp)
776 unsigned int best_num, best_den;
779 struct snd_interval t;
781 unsigned int result_num, result_den;
784 best_num = best_den = best_diff = 0;
785 for (k = 0; k < rats_count; ++k) {
786 unsigned int num = rats[k].num;
788 unsigned int q = i->min;
792 den = div_up(num, q);
793 if (den < rats[k].den_min)
795 if (den > rats[k].den_max)
796 den = rats[k].den_max;
799 r = (den - rats[k].den_min) % rats[k].den_step;
803 diff = num - q * den;
807 diff * best_den < best_diff * den) {
817 t.min = div_down(best_num, best_den);
818 t.openmin = !!(best_num % best_den);
820 result_num = best_num;
821 result_diff = best_diff;
822 result_den = best_den;
823 best_num = best_den = best_diff = 0;
824 for (k = 0; k < rats_count; ++k) {
825 unsigned int num = rats[k].num;
827 unsigned int q = i->max;
833 den = div_down(num, q);
834 if (den > rats[k].den_max)
836 if (den < rats[k].den_min)
837 den = rats[k].den_min;
840 r = (den - rats[k].den_min) % rats[k].den_step;
842 den += rats[k].den_step - r;
844 diff = q * den - num;
848 diff * best_den < best_diff * den) {
858 t.max = div_up(best_num, best_den);
859 t.openmax = !!(best_num % best_den);
861 err = snd_interval_refine(i, &t);
865 if (snd_interval_single(i)) {
866 if (best_diff * result_den < result_diff * best_den) {
867 result_num = best_num;
868 result_den = best_den;
878 EXPORT_SYMBOL(snd_interval_ratnum);
881 * snd_interval_ratden - refine the interval value
882 * @i: interval to refine
883 * @rats_count: number of struct ratden
884 * @rats: struct ratden array
885 * @nump: pointer to store the resultant numerator
886 * @denp: pointer to store the resultant denominator
888 * Returns non-zero if the value is changed, zero if not changed.
890 static int snd_interval_ratden(struct snd_interval *i,
891 unsigned int rats_count, struct snd_ratden *rats,
892 unsigned int *nump, unsigned int *denp)
894 unsigned int best_num, best_diff, best_den;
896 struct snd_interval t;
899 best_num = best_den = best_diff = 0;
900 for (k = 0; k < rats_count; ++k) {
902 unsigned int den = rats[k].den;
903 unsigned int q = i->min;
906 if (num > rats[k].num_max)
908 if (num < rats[k].num_min)
909 num = rats[k].num_max;
912 r = (num - rats[k].num_min) % rats[k].num_step;
914 num += rats[k].num_step - r;
916 diff = num - q * den;
918 diff * best_den < best_diff * den) {
928 t.min = div_down(best_num, best_den);
929 t.openmin = !!(best_num % best_den);
931 best_num = best_den = best_diff = 0;
932 for (k = 0; k < rats_count; ++k) {
934 unsigned int den = rats[k].den;
935 unsigned int q = i->max;
938 if (num < rats[k].num_min)
940 if (num > rats[k].num_max)
941 num = rats[k].num_max;
944 r = (num - rats[k].num_min) % rats[k].num_step;
948 diff = q * den - num;
950 diff * best_den < best_diff * den) {
960 t.max = div_up(best_num, best_den);
961 t.openmax = !!(best_num % best_den);
963 err = snd_interval_refine(i, &t);
967 if (snd_interval_single(i)) {
977 * snd_interval_list - refine the interval value from the list
978 * @i: the interval value to refine
979 * @count: the number of elements in the list
980 * @list: the value list
981 * @mask: the bit-mask to evaluate
983 * Refines the interval value from the list.
984 * When mask is non-zero, only the elements corresponding to bit 1 are
987 * Returns non-zero if the value is changed, zero if not changed.
989 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
992 struct snd_interval list_range;
998 snd_interval_any(&list_range);
999 list_range.min = UINT_MAX;
1001 for (k = 0; k < count; k++) {
1002 if (mask && !(mask & (1 << k)))
1004 if (!snd_interval_test(i, list[k]))
1006 list_range.min = min(list_range.min, list[k]);
1007 list_range.max = max(list_range.max, list[k]);
1009 return snd_interval_refine(i, &list_range);
1012 EXPORT_SYMBOL(snd_interval_list);
1014 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1018 n = (i->min - min) % step;
1019 if (n != 0 || i->openmin) {
1023 n = (i->max - min) % step;
1024 if (n != 0 || i->openmax) {
1028 if (snd_interval_checkempty(i)) {
1035 /* Info constraints helpers */
1038 * snd_pcm_hw_rule_add - add the hw-constraint rule
1039 * @runtime: the pcm runtime instance
1040 * @cond: condition bits
1041 * @var: the variable to evaluate
1042 * @func: the evaluation function
1043 * @private: the private data pointer passed to function
1044 * @dep: the dependent variables
1046 * Returns zero if successful, or a negative error code on failure.
1048 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1050 snd_pcm_hw_rule_func_t func, void *private,
1053 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1054 struct snd_pcm_hw_rule *c;
1057 va_start(args, dep);
1058 if (constrs->rules_num >= constrs->rules_all) {
1059 struct snd_pcm_hw_rule *new;
1060 unsigned int new_rules = constrs->rules_all + 16;
1061 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1064 if (constrs->rules) {
1065 memcpy(new, constrs->rules,
1066 constrs->rules_num * sizeof(*c));
1067 kfree(constrs->rules);
1069 constrs->rules = new;
1070 constrs->rules_all = new_rules;
1072 c = &constrs->rules[constrs->rules_num];
1076 c->private = private;
1079 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
1084 dep = va_arg(args, int);
1086 constrs->rules_num++;
1091 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1094 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1095 * @runtime: PCM runtime instance
1096 * @var: hw_params variable to apply the mask
1097 * @mask: the bitmap mask
1099 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1101 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1104 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1105 struct snd_mask *maskp = constrs_mask(constrs, var);
1106 *maskp->bits &= mask;
1107 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1108 if (*maskp->bits == 0)
1114 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1115 * @runtime: PCM runtime instance
1116 * @var: hw_params variable to apply the mask
1117 * @mask: the 64bit bitmap mask
1119 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1121 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1124 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1125 struct snd_mask *maskp = constrs_mask(constrs, var);
1126 maskp->bits[0] &= (u_int32_t)mask;
1127 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1128 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1129 if (! maskp->bits[0] && ! maskp->bits[1])
1135 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1136 * @runtime: PCM runtime instance
1137 * @var: hw_params variable to apply the integer constraint
1139 * Apply the constraint of integer to an interval parameter.
1141 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1143 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1144 return snd_interval_setinteger(constrs_interval(constrs, var));
1147 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1150 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1151 * @runtime: PCM runtime instance
1152 * @var: hw_params variable to apply the range
1153 * @min: the minimal value
1154 * @max: the maximal value
1156 * Apply the min/max range constraint to an interval parameter.
1158 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1159 unsigned int min, unsigned int max)
1161 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1162 struct snd_interval t;
1165 t.openmin = t.openmax = 0;
1167 return snd_interval_refine(constrs_interval(constrs, var), &t);
1170 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1172 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1173 struct snd_pcm_hw_rule *rule)
1175 struct snd_pcm_hw_constraint_list *list = rule->private;
1176 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1181 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1182 * @runtime: PCM runtime instance
1183 * @cond: condition bits
1184 * @var: hw_params variable to apply the list constraint
1187 * Apply the list of constraints to an interval parameter.
1189 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1191 snd_pcm_hw_param_t var,
1192 struct snd_pcm_hw_constraint_list *l)
1194 return snd_pcm_hw_rule_add(runtime, cond, var,
1195 snd_pcm_hw_rule_list, l,
1199 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1201 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1202 struct snd_pcm_hw_rule *rule)
1204 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1205 unsigned int num = 0, den = 0;
1207 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1208 r->nrats, r->rats, &num, &den);
1209 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1210 params->rate_num = num;
1211 params->rate_den = den;
1217 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1218 * @runtime: PCM runtime instance
1219 * @cond: condition bits
1220 * @var: hw_params variable to apply the ratnums constraint
1221 * @r: struct snd_ratnums constriants
1223 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1225 snd_pcm_hw_param_t var,
1226 struct snd_pcm_hw_constraint_ratnums *r)
1228 return snd_pcm_hw_rule_add(runtime, cond, var,
1229 snd_pcm_hw_rule_ratnums, r,
1233 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1235 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1236 struct snd_pcm_hw_rule *rule)
1238 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1239 unsigned int num = 0, den = 0;
1240 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1241 r->nrats, r->rats, &num, &den);
1242 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1243 params->rate_num = num;
1244 params->rate_den = den;
1250 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1251 * @runtime: PCM runtime instance
1252 * @cond: condition bits
1253 * @var: hw_params variable to apply the ratdens constraint
1254 * @r: struct snd_ratdens constriants
1256 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1258 snd_pcm_hw_param_t var,
1259 struct snd_pcm_hw_constraint_ratdens *r)
1261 return snd_pcm_hw_rule_add(runtime, cond, var,
1262 snd_pcm_hw_rule_ratdens, r,
1266 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1268 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1269 struct snd_pcm_hw_rule *rule)
1271 unsigned int l = (unsigned long) rule->private;
1272 int width = l & 0xffff;
1273 unsigned int msbits = l >> 16;
1274 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1275 if (snd_interval_single(i) && snd_interval_value(i) == width)
1276 params->msbits = msbits;
1281 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1282 * @runtime: PCM runtime instance
1283 * @cond: condition bits
1284 * @width: sample bits width
1285 * @msbits: msbits width
1287 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1290 unsigned int msbits)
1292 unsigned long l = (msbits << 16) | width;
1293 return snd_pcm_hw_rule_add(runtime, cond, -1,
1294 snd_pcm_hw_rule_msbits,
1296 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1299 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1301 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1302 struct snd_pcm_hw_rule *rule)
1304 unsigned long step = (unsigned long) rule->private;
1305 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1309 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1310 * @runtime: PCM runtime instance
1311 * @cond: condition bits
1312 * @var: hw_params variable to apply the step constraint
1315 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1317 snd_pcm_hw_param_t var,
1320 return snd_pcm_hw_rule_add(runtime, cond, var,
1321 snd_pcm_hw_rule_step, (void *) step,
1325 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1327 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1329 static unsigned int pow2_sizes[] = {
1330 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1331 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1332 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1333 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1335 return snd_interval_list(hw_param_interval(params, rule->var),
1336 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1340 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1341 * @runtime: PCM runtime instance
1342 * @cond: condition bits
1343 * @var: hw_params variable to apply the power-of-2 constraint
1345 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1347 snd_pcm_hw_param_t var)
1349 return snd_pcm_hw_rule_add(runtime, cond, var,
1350 snd_pcm_hw_rule_pow2, NULL,
1354 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1356 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1357 snd_pcm_hw_param_t var)
1359 if (hw_is_mask(var)) {
1360 snd_mask_any(hw_param_mask(params, var));
1361 params->cmask |= 1 << var;
1362 params->rmask |= 1 << var;
1365 if (hw_is_interval(var)) {
1366 snd_interval_any(hw_param_interval(params, var));
1367 params->cmask |= 1 << var;
1368 params->rmask |= 1 << var;
1374 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1377 memset(params, 0, sizeof(*params));
1378 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1379 _snd_pcm_hw_param_any(params, k);
1380 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1381 _snd_pcm_hw_param_any(params, k);
1385 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1388 * snd_pcm_hw_param_value - return @params field @var value
1389 * @params: the hw_params instance
1390 * @var: parameter to retrieve
1391 * @dir: pointer to the direction (-1,0,1) or %NULL
1393 * Return the value for field @var if it's fixed in configuration space
1394 * defined by @params. Return -%EINVAL otherwise.
1396 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1397 snd_pcm_hw_param_t var, int *dir)
1399 if (hw_is_mask(var)) {
1400 const struct snd_mask *mask = hw_param_mask_c(params, var);
1401 if (!snd_mask_single(mask))
1405 return snd_mask_value(mask);
1407 if (hw_is_interval(var)) {
1408 const struct snd_interval *i = hw_param_interval_c(params, var);
1409 if (!snd_interval_single(i))
1413 return snd_interval_value(i);
1418 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1420 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1421 snd_pcm_hw_param_t var)
1423 if (hw_is_mask(var)) {
1424 snd_mask_none(hw_param_mask(params, var));
1425 params->cmask |= 1 << var;
1426 params->rmask |= 1 << var;
1427 } else if (hw_is_interval(var)) {
1428 snd_interval_none(hw_param_interval(params, var));
1429 params->cmask |= 1 << var;
1430 params->rmask |= 1 << var;
1436 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1438 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1439 snd_pcm_hw_param_t var)
1442 if (hw_is_mask(var))
1443 changed = snd_mask_refine_first(hw_param_mask(params, var));
1444 else if (hw_is_interval(var))
1445 changed = snd_interval_refine_first(hw_param_interval(params, var));
1449 params->cmask |= 1 << var;
1450 params->rmask |= 1 << var;
1457 * snd_pcm_hw_param_first - refine config space and return minimum value
1458 * @pcm: PCM instance
1459 * @params: the hw_params instance
1460 * @var: parameter to retrieve
1461 * @dir: pointer to the direction (-1,0,1) or %NULL
1463 * Inside configuration space defined by @params remove from @var all
1464 * values > minimum. Reduce configuration space accordingly.
1465 * Return the minimum.
1467 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1468 struct snd_pcm_hw_params *params,
1469 snd_pcm_hw_param_t var, int *dir)
1471 int changed = _snd_pcm_hw_param_first(params, var);
1474 if (params->rmask) {
1475 int err = snd_pcm_hw_refine(pcm, params);
1476 if (snd_BUG_ON(err < 0))
1479 return snd_pcm_hw_param_value(params, var, dir);
1482 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1484 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1485 snd_pcm_hw_param_t var)
1488 if (hw_is_mask(var))
1489 changed = snd_mask_refine_last(hw_param_mask(params, var));
1490 else if (hw_is_interval(var))
1491 changed = snd_interval_refine_last(hw_param_interval(params, var));
1495 params->cmask |= 1 << var;
1496 params->rmask |= 1 << var;
1503 * snd_pcm_hw_param_last - refine config space and return maximum value
1504 * @pcm: PCM instance
1505 * @params: the hw_params instance
1506 * @var: parameter to retrieve
1507 * @dir: pointer to the direction (-1,0,1) or %NULL
1509 * Inside configuration space defined by @params remove from @var all
1510 * values < maximum. Reduce configuration space accordingly.
1511 * Return the maximum.
1513 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1514 struct snd_pcm_hw_params *params,
1515 snd_pcm_hw_param_t var, int *dir)
1517 int changed = _snd_pcm_hw_param_last(params, var);
1520 if (params->rmask) {
1521 int err = snd_pcm_hw_refine(pcm, params);
1522 if (snd_BUG_ON(err < 0))
1525 return snd_pcm_hw_param_value(params, var, dir);
1528 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1531 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1532 * @pcm: PCM instance
1533 * @params: the hw_params instance
1535 * Choose one configuration from configuration space defined by @params.
1536 * The configuration chosen is that obtained fixing in this order:
1537 * first access, first format, first subformat, min channels,
1538 * min rate, min period time, max buffer size, min tick time
1540 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1541 struct snd_pcm_hw_params *params)
1543 static int vars[] = {
1544 SNDRV_PCM_HW_PARAM_ACCESS,
1545 SNDRV_PCM_HW_PARAM_FORMAT,
1546 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1547 SNDRV_PCM_HW_PARAM_CHANNELS,
1548 SNDRV_PCM_HW_PARAM_RATE,
1549 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1550 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1551 SNDRV_PCM_HW_PARAM_TICK_TIME,
1556 for (v = vars; *v != -1; v++) {
1557 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1558 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1560 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1561 if (snd_BUG_ON(err < 0))
1567 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1570 struct snd_pcm_runtime *runtime = substream->runtime;
1571 unsigned long flags;
1572 snd_pcm_stream_lock_irqsave(substream, flags);
1573 if (snd_pcm_running(substream) &&
1574 snd_pcm_update_hw_ptr(substream) >= 0)
1575 runtime->status->hw_ptr %= runtime->buffer_size;
1577 runtime->status->hw_ptr = 0;
1578 snd_pcm_stream_unlock_irqrestore(substream, flags);
1582 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1585 struct snd_pcm_channel_info *info = arg;
1586 struct snd_pcm_runtime *runtime = substream->runtime;
1588 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1592 width = snd_pcm_format_physical_width(runtime->format);
1596 switch (runtime->access) {
1597 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1598 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1599 info->first = info->channel * width;
1600 info->step = runtime->channels * width;
1602 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1603 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1605 size_t size = runtime->dma_bytes / runtime->channels;
1606 info->first = info->channel * size * 8;
1617 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1620 struct snd_pcm_hw_params *params = arg;
1621 snd_pcm_format_t format;
1622 int channels, width;
1624 params->fifo_size = substream->runtime->hw.fifo_size;
1625 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1626 format = params_format(params);
1627 channels = params_channels(params);
1628 width = snd_pcm_format_physical_width(format);
1629 params->fifo_size /= width * channels;
1635 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1636 * @substream: the pcm substream instance
1637 * @cmd: ioctl command
1638 * @arg: ioctl argument
1640 * Processes the generic ioctl commands for PCM.
1641 * Can be passed as the ioctl callback for PCM ops.
1643 * Returns zero if successful, or a negative error code on failure.
1645 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1646 unsigned int cmd, void *arg)
1649 case SNDRV_PCM_IOCTL1_INFO:
1651 case SNDRV_PCM_IOCTL1_RESET:
1652 return snd_pcm_lib_ioctl_reset(substream, arg);
1653 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1654 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1655 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1656 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1661 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1664 * snd_pcm_period_elapsed - update the pcm status for the next period
1665 * @substream: the pcm substream instance
1667 * This function is called from the interrupt handler when the
1668 * PCM has processed the period size. It will update the current
1669 * pointer, wake up sleepers, etc.
1671 * Even if more than one periods have elapsed since the last call, you
1672 * have to call this only once.
1674 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1676 struct snd_pcm_runtime *runtime;
1677 unsigned long flags;
1679 if (PCM_RUNTIME_CHECK(substream))
1681 runtime = substream->runtime;
1683 if (runtime->transfer_ack_begin)
1684 runtime->transfer_ack_begin(substream);
1686 snd_pcm_stream_lock_irqsave(substream, flags);
1687 if (!snd_pcm_running(substream) ||
1688 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1691 if (substream->timer_running)
1692 snd_timer_interrupt(substream->timer, 1);
1694 snd_pcm_stream_unlock_irqrestore(substream, flags);
1695 if (runtime->transfer_ack_end)
1696 runtime->transfer_ack_end(substream);
1697 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1700 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1703 * Wait until avail_min data becomes available
1704 * Returns a negative error code if any error occurs during operation.
1705 * The available space is stored on availp. When err = 0 and avail = 0
1706 * on the capture stream, it indicates the stream is in DRAINING state.
1708 static int wait_for_avail_min(struct snd_pcm_substream *substream,
1709 snd_pcm_uframes_t *availp)
1711 struct snd_pcm_runtime *runtime = substream->runtime;
1712 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1715 snd_pcm_uframes_t avail = 0;
1718 init_waitqueue_entry(&wait, current);
1719 add_wait_queue(&runtime->tsleep, &wait);
1721 if (signal_pending(current)) {
1725 set_current_state(TASK_INTERRUPTIBLE);
1726 snd_pcm_stream_unlock_irq(substream);
1727 tout = schedule_timeout(msecs_to_jiffies(10000));
1728 snd_pcm_stream_lock_irq(substream);
1729 switch (runtime->status->state) {
1730 case SNDRV_PCM_STATE_SUSPENDED:
1733 case SNDRV_PCM_STATE_XRUN:
1736 case SNDRV_PCM_STATE_DRAINING:
1740 avail = 0; /* indicate draining */
1742 case SNDRV_PCM_STATE_OPEN:
1743 case SNDRV_PCM_STATE_SETUP:
1744 case SNDRV_PCM_STATE_DISCONNECTED:
1749 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1750 is_playback ? "playback" : "capture");
1755 avail = snd_pcm_playback_avail(runtime);
1757 avail = snd_pcm_capture_avail(runtime);
1758 if (avail >= runtime->control->avail_min)
1762 remove_wait_queue(&runtime->tsleep, &wait);
1767 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1769 unsigned long data, unsigned int off,
1770 snd_pcm_uframes_t frames)
1772 struct snd_pcm_runtime *runtime = substream->runtime;
1774 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1775 if (substream->ops->copy) {
1776 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1779 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1780 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1786 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1787 unsigned long data, unsigned int off,
1788 snd_pcm_uframes_t size);
1790 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1792 snd_pcm_uframes_t size,
1794 transfer_f transfer)
1796 struct snd_pcm_runtime *runtime = substream->runtime;
1797 snd_pcm_uframes_t xfer = 0;
1798 snd_pcm_uframes_t offset = 0;
1804 snd_pcm_stream_lock_irq(substream);
1805 switch (runtime->status->state) {
1806 case SNDRV_PCM_STATE_PREPARED:
1807 case SNDRV_PCM_STATE_RUNNING:
1808 case SNDRV_PCM_STATE_PAUSED:
1810 case SNDRV_PCM_STATE_XRUN:
1813 case SNDRV_PCM_STATE_SUSPENDED:
1823 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1824 snd_pcm_uframes_t avail;
1825 snd_pcm_uframes_t cont;
1826 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1827 snd_pcm_update_hw_ptr(substream);
1828 avail = snd_pcm_playback_avail(runtime);
1834 err = wait_for_avail_min(substream, &avail);
1838 frames = size > avail ? avail : size;
1839 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1842 if (snd_BUG_ON(!frames)) {
1844 snd_pcm_stream_unlock_irq(substream);
1847 appl_ptr = runtime->control->appl_ptr;
1848 appl_ofs = appl_ptr % runtime->buffer_size;
1849 snd_pcm_stream_unlock_irq(substream);
1850 err = transfer(substream, appl_ofs, data, offset, frames);
1851 snd_pcm_stream_lock_irq(substream);
1854 switch (runtime->status->state) {
1855 case SNDRV_PCM_STATE_XRUN:
1858 case SNDRV_PCM_STATE_SUSPENDED:
1865 if (appl_ptr >= runtime->boundary)
1866 appl_ptr -= runtime->boundary;
1867 runtime->control->appl_ptr = appl_ptr;
1868 if (substream->ops->ack)
1869 substream->ops->ack(substream);
1874 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1875 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1876 err = snd_pcm_start(substream);
1883 if (xfer > 0 && err >= 0)
1884 snd_pcm_update_state(substream, runtime);
1885 snd_pcm_stream_unlock_irq(substream);
1886 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1889 /* sanity-check for read/write methods */
1890 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1892 struct snd_pcm_runtime *runtime;
1893 if (PCM_RUNTIME_CHECK(substream))
1895 runtime = substream->runtime;
1896 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1898 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1903 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1905 struct snd_pcm_runtime *runtime;
1909 err = pcm_sanity_check(substream);
1912 runtime = substream->runtime;
1913 nonblock = !!(substream->f_flags & O_NONBLOCK);
1915 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1916 runtime->channels > 1)
1918 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1919 snd_pcm_lib_write_transfer);
1922 EXPORT_SYMBOL(snd_pcm_lib_write);
1924 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1926 unsigned long data, unsigned int off,
1927 snd_pcm_uframes_t frames)
1929 struct snd_pcm_runtime *runtime = substream->runtime;
1931 void __user **bufs = (void __user **)data;
1932 int channels = runtime->channels;
1934 if (substream->ops->copy) {
1935 if (snd_BUG_ON(!substream->ops->silence))
1937 for (c = 0; c < channels; ++c, ++bufs) {
1938 if (*bufs == NULL) {
1939 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1942 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1943 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1948 /* default transfer behaviour */
1949 size_t dma_csize = runtime->dma_bytes / channels;
1950 for (c = 0; c < channels; ++c, ++bufs) {
1951 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1952 if (*bufs == NULL) {
1953 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1955 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1956 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1964 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1966 snd_pcm_uframes_t frames)
1968 struct snd_pcm_runtime *runtime;
1972 err = pcm_sanity_check(substream);
1975 runtime = substream->runtime;
1976 nonblock = !!(substream->f_flags & O_NONBLOCK);
1978 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1980 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1981 nonblock, snd_pcm_lib_writev_transfer);
1984 EXPORT_SYMBOL(snd_pcm_lib_writev);
1986 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
1988 unsigned long data, unsigned int off,
1989 snd_pcm_uframes_t frames)
1991 struct snd_pcm_runtime *runtime = substream->runtime;
1993 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1994 if (substream->ops->copy) {
1995 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1998 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1999 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2005 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2007 snd_pcm_uframes_t size,
2009 transfer_f transfer)
2011 struct snd_pcm_runtime *runtime = substream->runtime;
2012 snd_pcm_uframes_t xfer = 0;
2013 snd_pcm_uframes_t offset = 0;
2019 snd_pcm_stream_lock_irq(substream);
2020 switch (runtime->status->state) {
2021 case SNDRV_PCM_STATE_PREPARED:
2022 if (size >= runtime->start_threshold) {
2023 err = snd_pcm_start(substream);
2028 case SNDRV_PCM_STATE_DRAINING:
2029 case SNDRV_PCM_STATE_RUNNING:
2030 case SNDRV_PCM_STATE_PAUSED:
2032 case SNDRV_PCM_STATE_XRUN:
2035 case SNDRV_PCM_STATE_SUSPENDED:
2045 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2046 snd_pcm_uframes_t avail;
2047 snd_pcm_uframes_t cont;
2048 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2049 snd_pcm_update_hw_ptr(substream);
2050 avail = snd_pcm_capture_avail(runtime);
2052 if (runtime->status->state ==
2053 SNDRV_PCM_STATE_DRAINING) {
2054 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2061 err = wait_for_avail_min(substream, &avail);
2065 continue; /* draining */
2067 frames = size > avail ? avail : size;
2068 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2071 if (snd_BUG_ON(!frames)) {
2073 snd_pcm_stream_unlock_irq(substream);
2076 appl_ptr = runtime->control->appl_ptr;
2077 appl_ofs = appl_ptr % runtime->buffer_size;
2078 snd_pcm_stream_unlock_irq(substream);
2079 err = transfer(substream, appl_ofs, data, offset, frames);
2080 snd_pcm_stream_lock_irq(substream);
2083 switch (runtime->status->state) {
2084 case SNDRV_PCM_STATE_XRUN:
2087 case SNDRV_PCM_STATE_SUSPENDED:
2094 if (appl_ptr >= runtime->boundary)
2095 appl_ptr -= runtime->boundary;
2096 runtime->control->appl_ptr = appl_ptr;
2097 if (substream->ops->ack)
2098 substream->ops->ack(substream);
2106 if (xfer > 0 && err >= 0)
2107 snd_pcm_update_state(substream, runtime);
2108 snd_pcm_stream_unlock_irq(substream);
2109 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2112 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2114 struct snd_pcm_runtime *runtime;
2118 err = pcm_sanity_check(substream);
2121 runtime = substream->runtime;
2122 nonblock = !!(substream->f_flags & O_NONBLOCK);
2123 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2125 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2128 EXPORT_SYMBOL(snd_pcm_lib_read);
2130 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2132 unsigned long data, unsigned int off,
2133 snd_pcm_uframes_t frames)
2135 struct snd_pcm_runtime *runtime = substream->runtime;
2137 void __user **bufs = (void __user **)data;
2138 int channels = runtime->channels;
2140 if (substream->ops->copy) {
2141 for (c = 0; c < channels; ++c, ++bufs) {
2145 buf = *bufs + samples_to_bytes(runtime, off);
2146 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2150 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2151 for (c = 0; c < channels; ++c, ++bufs) {
2157 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2158 buf = *bufs + samples_to_bytes(runtime, off);
2159 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2166 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2168 snd_pcm_uframes_t frames)
2170 struct snd_pcm_runtime *runtime;
2174 err = pcm_sanity_check(substream);
2177 runtime = substream->runtime;
2178 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2181 nonblock = !!(substream->f_flags & O_NONBLOCK);
2182 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2184 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2187 EXPORT_SYMBOL(snd_pcm_lib_readv);