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 dump_stack_on_xrun(substream) do { \
153 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
157 static void xrun(struct snd_pcm_substream *substream)
159 struct snd_pcm_runtime *runtime = substream->runtime;
161 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
162 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
163 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
164 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
166 pcm_debug_name(substream, name, sizeof(name));
167 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
168 dump_stack_on_xrun(substream);
172 #define hw_ptr_error(substream, fmt, args...) \
174 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
175 xrun_log_show(substream); \
176 if (printk_ratelimit()) { \
177 snd_printd("PCM: " fmt, ##args); \
179 dump_stack_on_xrun(substream); \
183 #define XRUN_LOG_CNT 10
185 struct hwptr_log_entry {
186 unsigned long jiffies;
187 snd_pcm_uframes_t pos;
188 snd_pcm_uframes_t period_size;
189 snd_pcm_uframes_t buffer_size;
190 snd_pcm_uframes_t old_hw_ptr;
191 snd_pcm_uframes_t hw_ptr_base;
194 struct snd_pcm_hwptr_log {
197 struct hwptr_log_entry entries[XRUN_LOG_CNT];
200 static void xrun_log(struct snd_pcm_substream *substream,
201 snd_pcm_uframes_t pos)
203 struct snd_pcm_runtime *runtime = substream->runtime;
204 struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
205 struct hwptr_log_entry *entry;
208 log = kzalloc(sizeof(*log), GFP_ATOMIC);
211 runtime->hwptr_log = log;
213 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
216 entry = &log->entries[log->idx];
217 entry->jiffies = jiffies;
219 entry->period_size = runtime->period_size;
220 entry->buffer_size = runtime->buffer_size;;
221 entry->old_hw_ptr = runtime->status->hw_ptr;
222 entry->hw_ptr_base = runtime->hw_ptr_base;
223 log->idx = (log->idx + 1) % XRUN_LOG_CNT;
226 static void xrun_log_show(struct snd_pcm_substream *substream)
228 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
229 struct hwptr_log_entry *entry;
236 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
238 pcm_debug_name(substream, name, sizeof(name));
239 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
240 entry = &log->entries[idx];
241 if (entry->period_size == 0)
243 snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
245 name, entry->jiffies, (unsigned long)entry->pos,
246 (unsigned long)entry->period_size,
247 (unsigned long)entry->buffer_size,
248 (unsigned long)entry->old_hw_ptr,
249 (unsigned long)entry->hw_ptr_base);
256 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
258 #define xrun_debug(substream, mask) 0
259 #define xrun(substream) do { } while (0)
260 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
261 #define xrun_log(substream, pos) do { } while (0)
262 #define xrun_log_show(substream) do { } while (0)
266 int snd_pcm_update_state(struct snd_pcm_substream *substream,
267 struct snd_pcm_runtime *runtime)
269 snd_pcm_uframes_t avail;
271 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
272 avail = snd_pcm_playback_avail(runtime);
274 avail = snd_pcm_capture_avail(runtime);
275 if (avail > runtime->avail_max)
276 runtime->avail_max = avail;
277 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
278 if (avail >= runtime->buffer_size) {
279 snd_pcm_drain_done(substream);
283 if (avail >= runtime->stop_threshold) {
288 if (!runtime->nowake && avail >= runtime->control->avail_min)
289 wake_up(&runtime->sleep);
293 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
294 unsigned int in_interrupt)
296 struct snd_pcm_runtime *runtime = substream->runtime;
297 snd_pcm_uframes_t pos;
298 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
299 snd_pcm_sframes_t hdelta, delta;
300 unsigned long jdelta;
302 old_hw_ptr = runtime->status->hw_ptr;
303 pos = substream->ops->pointer(substream);
304 if (pos == SNDRV_PCM_POS_XRUN) {
308 if (pos >= runtime->buffer_size) {
309 if (printk_ratelimit()) {
311 pcm_debug_name(substream, name, sizeof(name));
312 xrun_log_show(substream);
313 snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
314 "buffer size = %ld, period size = %ld\n",
315 name, pos, runtime->buffer_size,
316 runtime->period_size);
320 pos -= pos % runtime->min_align;
321 if (xrun_debug(substream, XRUN_DEBUG_LOG))
322 xrun_log(substream, pos);
323 hw_base = runtime->hw_ptr_base;
324 new_hw_ptr = hw_base + pos;
326 /* we know that one period was processed */
327 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
328 delta = old_hw_ptr - (old_hw_ptr % runtime->period_size)
329 + runtime->period_size;
330 if (delta > new_hw_ptr) {
331 hw_base += runtime->buffer_size;
332 if (hw_base >= runtime->boundary)
334 new_hw_ptr = hw_base + pos;
338 /* new_hw_ptr might be lower than old_hw_ptr in case when */
339 /* pointer crosses the end of the ring buffer */
340 if (new_hw_ptr < old_hw_ptr) {
341 hw_base += runtime->buffer_size;
342 if (hw_base >= runtime->boundary)
344 new_hw_ptr = hw_base + pos;
347 delta = (new_hw_ptr - old_hw_ptr) % runtime->boundary;
348 if (xrun_debug(substream, in_interrupt ?
349 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
351 pcm_debug_name(substream, name, sizeof(name));
352 snd_printd("%s_update: %s: pos=%u/%u/%u, "
353 "hwptr=%ld/%ld/%ld/%ld\n",
354 in_interrupt ? "period" : "hwptr",
357 (unsigned int)runtime->period_size,
358 (unsigned int)runtime->buffer_size,
359 (unsigned long)delta,
360 (unsigned long)old_hw_ptr,
361 (unsigned long)new_hw_ptr,
362 (unsigned long)runtime->hw_ptr_base);
364 /* something must be really wrong */
365 if (delta >= runtime->buffer_size + runtime->period_size) {
366 hw_ptr_error(substream,
367 "Unexpected hw_pointer value %s"
368 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
370 in_interrupt ? "[Q] " : "[P]",
371 substream->stream, (long)pos,
372 (long)new_hw_ptr, (long)old_hw_ptr);
376 /* Do jiffies check only in xrun_debug mode */
377 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
378 goto no_jiffies_check;
380 /* Skip the jiffies check for hardwares with BATCH flag.
381 * Such hardware usually just increases the position at each IRQ,
382 * thus it can't give any strange position.
384 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
385 goto no_jiffies_check;
387 if (hdelta < runtime->delay)
388 goto no_jiffies_check;
389 hdelta -= runtime->delay;
390 jdelta = jiffies - runtime->hw_ptr_jiffies;
391 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
393 (((runtime->period_size * HZ) / runtime->rate)
395 /* move new_hw_ptr according jiffies not pos variable */
396 new_hw_ptr = old_hw_ptr;
397 /* use loop to avoid checks for delta overflows */
398 /* the delta value is small or zero in most cases */
400 new_hw_ptr += runtime->period_size;
401 if (new_hw_ptr >= runtime->boundary)
402 new_hw_ptr -= runtime->boundary;
405 /* align hw_base to buffer_size */
406 hw_base = new_hw_ptr - (new_hw_ptr % runtime->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), delta,
416 (unsigned long)old_hw_ptr,
417 (unsigned long)new_hw_ptr);
420 if (delta > runtime->period_size + runtime->period_size / 2) {
421 hw_ptr_error(substream,
422 "Lost interrupts? %s"
423 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
425 in_interrupt ? "[Q] " : "",
426 substream->stream, (long)delta,
431 if (runtime->status->hw_ptr == new_hw_ptr)
434 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
435 runtime->silence_size > 0)
436 snd_pcm_playback_silence(substream, new_hw_ptr);
438 runtime->hw_ptr_base = hw_base;
439 runtime->status->hw_ptr = new_hw_ptr;
440 runtime->hw_ptr_jiffies = jiffies;
441 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
442 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
444 return snd_pcm_update_state(substream, runtime);
447 /* CAUTION: call it with irq disabled */
448 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
450 return snd_pcm_update_hw_ptr0(substream, 0);
454 * snd_pcm_set_ops - set the PCM operators
455 * @pcm: the pcm instance
456 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
457 * @ops: the operator table
459 * Sets the given PCM operators to the pcm instance.
461 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
463 struct snd_pcm_str *stream = &pcm->streams[direction];
464 struct snd_pcm_substream *substream;
466 for (substream = stream->substream; substream != NULL; substream = substream->next)
467 substream->ops = ops;
470 EXPORT_SYMBOL(snd_pcm_set_ops);
473 * snd_pcm_sync - set the PCM sync id
474 * @substream: the pcm substream
476 * Sets the PCM sync identifier for the card.
478 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
480 struct snd_pcm_runtime *runtime = substream->runtime;
482 runtime->sync.id32[0] = substream->pcm->card->number;
483 runtime->sync.id32[1] = -1;
484 runtime->sync.id32[2] = -1;
485 runtime->sync.id32[3] = -1;
488 EXPORT_SYMBOL(snd_pcm_set_sync);
491 * Standard ioctl routine
494 static inline unsigned int div32(unsigned int a, unsigned int b,
505 static inline unsigned int div_down(unsigned int a, unsigned int b)
512 static inline unsigned int div_up(unsigned int a, unsigned int b)
524 static inline unsigned int mul(unsigned int a, unsigned int b)
528 if (div_down(UINT_MAX, a) < b)
533 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
534 unsigned int c, unsigned int *r)
536 u_int64_t n = (u_int64_t) a * b;
542 n = div_u64_rem(n, c, r);
551 * snd_interval_refine - refine the interval value of configurator
552 * @i: the interval value to refine
553 * @v: the interval value to refer to
555 * Refines the interval value with the reference value.
556 * The interval is changed to the range satisfying both intervals.
557 * The interval status (min, max, integer, etc.) are evaluated.
559 * Returns non-zero if the value is changed, zero if not changed.
561 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
564 if (snd_BUG_ON(snd_interval_empty(i)))
566 if (i->min < v->min) {
568 i->openmin = v->openmin;
570 } else if (i->min == v->min && !i->openmin && v->openmin) {
574 if (i->max > v->max) {
576 i->openmax = v->openmax;
578 } else if (i->max == v->max && !i->openmax && v->openmax) {
582 if (!i->integer && v->integer) {
595 } else if (!i->openmin && !i->openmax && i->min == i->max)
597 if (snd_interval_checkempty(i)) {
598 snd_interval_none(i);
604 EXPORT_SYMBOL(snd_interval_refine);
606 static int snd_interval_refine_first(struct snd_interval *i)
608 if (snd_BUG_ON(snd_interval_empty(i)))
610 if (snd_interval_single(i))
613 i->openmax = i->openmin;
619 static int snd_interval_refine_last(struct snd_interval *i)
621 if (snd_BUG_ON(snd_interval_empty(i)))
623 if (snd_interval_single(i))
626 i->openmin = i->openmax;
632 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
634 if (a->empty || b->empty) {
635 snd_interval_none(c);
639 c->min = mul(a->min, b->min);
640 c->openmin = (a->openmin || b->openmin);
641 c->max = mul(a->max, b->max);
642 c->openmax = (a->openmax || b->openmax);
643 c->integer = (a->integer && b->integer);
647 * snd_interval_div - refine the interval value with division
654 * Returns non-zero if the value is changed, zero if not changed.
656 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
659 if (a->empty || b->empty) {
660 snd_interval_none(c);
664 c->min = div32(a->min, b->max, &r);
665 c->openmin = (r || a->openmin || b->openmax);
667 c->max = div32(a->max, b->min, &r);
672 c->openmax = (a->openmax || b->openmin);
681 * snd_interval_muldivk - refine the interval value
684 * @k: divisor (as integer)
689 * Returns non-zero if the value is changed, zero if not changed.
691 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
692 unsigned int k, struct snd_interval *c)
695 if (a->empty || b->empty) {
696 snd_interval_none(c);
700 c->min = muldiv32(a->min, b->min, k, &r);
701 c->openmin = (r || a->openmin || b->openmin);
702 c->max = muldiv32(a->max, b->max, k, &r);
707 c->openmax = (a->openmax || b->openmax);
712 * snd_interval_mulkdiv - refine the interval value
714 * @k: dividend 2 (as integer)
720 * Returns non-zero if the value is changed, zero if not changed.
722 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
723 const struct snd_interval *b, struct snd_interval *c)
726 if (a->empty || b->empty) {
727 snd_interval_none(c);
731 c->min = muldiv32(a->min, k, b->max, &r);
732 c->openmin = (r || a->openmin || b->openmax);
734 c->max = muldiv32(a->max, k, b->min, &r);
739 c->openmax = (a->openmax || b->openmin);
751 * snd_interval_ratnum - refine the interval value
752 * @i: interval to refine
753 * @rats_count: number of ratnum_t
754 * @rats: ratnum_t array
755 * @nump: pointer to store the resultant numerator
756 * @denp: pointer to store the resultant denominator
758 * Returns non-zero if the value is changed, zero if not changed.
760 int snd_interval_ratnum(struct snd_interval *i,
761 unsigned int rats_count, struct snd_ratnum *rats,
762 unsigned int *nump, unsigned int *denp)
764 unsigned int best_num, best_den;
767 struct snd_interval t;
769 unsigned int result_num, result_den;
772 best_num = best_den = best_diff = 0;
773 for (k = 0; k < rats_count; ++k) {
774 unsigned int num = rats[k].num;
776 unsigned int q = i->min;
780 den = div_up(num, q);
781 if (den < rats[k].den_min)
783 if (den > rats[k].den_max)
784 den = rats[k].den_max;
787 r = (den - rats[k].den_min) % rats[k].den_step;
791 diff = num - q * den;
795 diff * best_den < best_diff * den) {
805 t.min = div_down(best_num, best_den);
806 t.openmin = !!(best_num % best_den);
808 result_num = best_num;
809 result_diff = best_diff;
810 result_den = best_den;
811 best_num = best_den = best_diff = 0;
812 for (k = 0; k < rats_count; ++k) {
813 unsigned int num = rats[k].num;
815 unsigned int q = i->max;
821 den = div_down(num, q);
822 if (den > rats[k].den_max)
824 if (den < rats[k].den_min)
825 den = rats[k].den_min;
828 r = (den - rats[k].den_min) % rats[k].den_step;
830 den += rats[k].den_step - r;
832 diff = q * den - num;
836 diff * best_den < best_diff * den) {
846 t.max = div_up(best_num, best_den);
847 t.openmax = !!(best_num % best_den);
849 err = snd_interval_refine(i, &t);
853 if (snd_interval_single(i)) {
854 if (best_diff * result_den < result_diff * best_den) {
855 result_num = best_num;
856 result_den = best_den;
866 EXPORT_SYMBOL(snd_interval_ratnum);
869 * snd_interval_ratden - refine the interval value
870 * @i: interval to refine
871 * @rats_count: number of struct ratden
872 * @rats: struct ratden array
873 * @nump: pointer to store the resultant numerator
874 * @denp: pointer to store the resultant denominator
876 * Returns non-zero if the value is changed, zero if not changed.
878 static int snd_interval_ratden(struct snd_interval *i,
879 unsigned int rats_count, struct snd_ratden *rats,
880 unsigned int *nump, unsigned int *denp)
882 unsigned int best_num, best_diff, best_den;
884 struct snd_interval t;
887 best_num = best_den = best_diff = 0;
888 for (k = 0; k < rats_count; ++k) {
890 unsigned int den = rats[k].den;
891 unsigned int q = i->min;
894 if (num > rats[k].num_max)
896 if (num < rats[k].num_min)
897 num = rats[k].num_max;
900 r = (num - rats[k].num_min) % rats[k].num_step;
902 num += rats[k].num_step - r;
904 diff = num - q * den;
906 diff * best_den < best_diff * den) {
916 t.min = div_down(best_num, best_den);
917 t.openmin = !!(best_num % best_den);
919 best_num = best_den = best_diff = 0;
920 for (k = 0; k < rats_count; ++k) {
922 unsigned int den = rats[k].den;
923 unsigned int q = i->max;
926 if (num < rats[k].num_min)
928 if (num > rats[k].num_max)
929 num = rats[k].num_max;
932 r = (num - rats[k].num_min) % rats[k].num_step;
936 diff = q * den - num;
938 diff * best_den < best_diff * den) {
948 t.max = div_up(best_num, best_den);
949 t.openmax = !!(best_num % best_den);
951 err = snd_interval_refine(i, &t);
955 if (snd_interval_single(i)) {
965 * snd_interval_list - refine the interval value from the list
966 * @i: the interval value to refine
967 * @count: the number of elements in the list
968 * @list: the value list
969 * @mask: the bit-mask to evaluate
971 * Refines the interval value from the list.
972 * When mask is non-zero, only the elements corresponding to bit 1 are
975 * Returns non-zero if the value is changed, zero if not changed.
977 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
980 struct snd_interval list_range;
986 snd_interval_any(&list_range);
987 list_range.min = UINT_MAX;
989 for (k = 0; k < count; k++) {
990 if (mask && !(mask & (1 << k)))
992 if (!snd_interval_test(i, list[k]))
994 list_range.min = min(list_range.min, list[k]);
995 list_range.max = max(list_range.max, list[k]);
997 return snd_interval_refine(i, &list_range);
1000 EXPORT_SYMBOL(snd_interval_list);
1002 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1006 n = (i->min - min) % step;
1007 if (n != 0 || i->openmin) {
1011 n = (i->max - min) % step;
1012 if (n != 0 || i->openmax) {
1016 if (snd_interval_checkempty(i)) {
1023 /* Info constraints helpers */
1026 * snd_pcm_hw_rule_add - add the hw-constraint rule
1027 * @runtime: the pcm runtime instance
1028 * @cond: condition bits
1029 * @var: the variable to evaluate
1030 * @func: the evaluation function
1031 * @private: the private data pointer passed to function
1032 * @dep: the dependent variables
1034 * Returns zero if successful, or a negative error code on failure.
1036 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1038 snd_pcm_hw_rule_func_t func, void *private,
1041 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1042 struct snd_pcm_hw_rule *c;
1045 va_start(args, dep);
1046 if (constrs->rules_num >= constrs->rules_all) {
1047 struct snd_pcm_hw_rule *new;
1048 unsigned int new_rules = constrs->rules_all + 16;
1049 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1052 if (constrs->rules) {
1053 memcpy(new, constrs->rules,
1054 constrs->rules_num * sizeof(*c));
1055 kfree(constrs->rules);
1057 constrs->rules = new;
1058 constrs->rules_all = new_rules;
1060 c = &constrs->rules[constrs->rules_num];
1064 c->private = private;
1067 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
1072 dep = va_arg(args, int);
1074 constrs->rules_num++;
1079 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1082 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1083 * @runtime: PCM runtime instance
1084 * @var: hw_params variable to apply the mask
1085 * @mask: the bitmap mask
1087 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1089 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1092 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1093 struct snd_mask *maskp = constrs_mask(constrs, var);
1094 *maskp->bits &= mask;
1095 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1096 if (*maskp->bits == 0)
1102 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1103 * @runtime: PCM runtime instance
1104 * @var: hw_params variable to apply the mask
1105 * @mask: the 64bit bitmap mask
1107 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1109 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1112 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1113 struct snd_mask *maskp = constrs_mask(constrs, var);
1114 maskp->bits[0] &= (u_int32_t)mask;
1115 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1116 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1117 if (! maskp->bits[0] && ! maskp->bits[1])
1123 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1124 * @runtime: PCM runtime instance
1125 * @var: hw_params variable to apply the integer constraint
1127 * Apply the constraint of integer to an interval parameter.
1129 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1131 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1132 return snd_interval_setinteger(constrs_interval(constrs, var));
1135 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1138 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1139 * @runtime: PCM runtime instance
1140 * @var: hw_params variable to apply the range
1141 * @min: the minimal value
1142 * @max: the maximal value
1144 * Apply the min/max range constraint to an interval parameter.
1146 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1147 unsigned int min, unsigned int max)
1149 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1150 struct snd_interval t;
1153 t.openmin = t.openmax = 0;
1155 return snd_interval_refine(constrs_interval(constrs, var), &t);
1158 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1160 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1161 struct snd_pcm_hw_rule *rule)
1163 struct snd_pcm_hw_constraint_list *list = rule->private;
1164 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1169 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1170 * @runtime: PCM runtime instance
1171 * @cond: condition bits
1172 * @var: hw_params variable to apply the list constraint
1175 * Apply the list of constraints to an interval parameter.
1177 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1179 snd_pcm_hw_param_t var,
1180 struct snd_pcm_hw_constraint_list *l)
1182 return snd_pcm_hw_rule_add(runtime, cond, var,
1183 snd_pcm_hw_rule_list, l,
1187 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1189 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1190 struct snd_pcm_hw_rule *rule)
1192 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1193 unsigned int num = 0, den = 0;
1195 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1196 r->nrats, r->rats, &num, &den);
1197 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1198 params->rate_num = num;
1199 params->rate_den = den;
1205 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1206 * @runtime: PCM runtime instance
1207 * @cond: condition bits
1208 * @var: hw_params variable to apply the ratnums constraint
1209 * @r: struct snd_ratnums constriants
1211 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1213 snd_pcm_hw_param_t var,
1214 struct snd_pcm_hw_constraint_ratnums *r)
1216 return snd_pcm_hw_rule_add(runtime, cond, var,
1217 snd_pcm_hw_rule_ratnums, r,
1221 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1223 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1224 struct snd_pcm_hw_rule *rule)
1226 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1227 unsigned int num = 0, den = 0;
1228 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1229 r->nrats, r->rats, &num, &den);
1230 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1231 params->rate_num = num;
1232 params->rate_den = den;
1238 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1239 * @runtime: PCM runtime instance
1240 * @cond: condition bits
1241 * @var: hw_params variable to apply the ratdens constraint
1242 * @r: struct snd_ratdens constriants
1244 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1246 snd_pcm_hw_param_t var,
1247 struct snd_pcm_hw_constraint_ratdens *r)
1249 return snd_pcm_hw_rule_add(runtime, cond, var,
1250 snd_pcm_hw_rule_ratdens, r,
1254 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1256 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1257 struct snd_pcm_hw_rule *rule)
1259 unsigned int l = (unsigned long) rule->private;
1260 int width = l & 0xffff;
1261 unsigned int msbits = l >> 16;
1262 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1263 if (snd_interval_single(i) && snd_interval_value(i) == width)
1264 params->msbits = msbits;
1269 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1270 * @runtime: PCM runtime instance
1271 * @cond: condition bits
1272 * @width: sample bits width
1273 * @msbits: msbits width
1275 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1278 unsigned int msbits)
1280 unsigned long l = (msbits << 16) | width;
1281 return snd_pcm_hw_rule_add(runtime, cond, -1,
1282 snd_pcm_hw_rule_msbits,
1284 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1287 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1289 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1290 struct snd_pcm_hw_rule *rule)
1292 unsigned long step = (unsigned long) rule->private;
1293 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1297 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1298 * @runtime: PCM runtime instance
1299 * @cond: condition bits
1300 * @var: hw_params variable to apply the step constraint
1303 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1305 snd_pcm_hw_param_t var,
1308 return snd_pcm_hw_rule_add(runtime, cond, var,
1309 snd_pcm_hw_rule_step, (void *) step,
1313 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1315 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1317 static unsigned int pow2_sizes[] = {
1318 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1319 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1320 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1321 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1323 return snd_interval_list(hw_param_interval(params, rule->var),
1324 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1328 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1329 * @runtime: PCM runtime instance
1330 * @cond: condition bits
1331 * @var: hw_params variable to apply the power-of-2 constraint
1333 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1335 snd_pcm_hw_param_t var)
1337 return snd_pcm_hw_rule_add(runtime, cond, var,
1338 snd_pcm_hw_rule_pow2, NULL,
1342 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1344 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1345 snd_pcm_hw_param_t var)
1347 if (hw_is_mask(var)) {
1348 snd_mask_any(hw_param_mask(params, var));
1349 params->cmask |= 1 << var;
1350 params->rmask |= 1 << var;
1353 if (hw_is_interval(var)) {
1354 snd_interval_any(hw_param_interval(params, var));
1355 params->cmask |= 1 << var;
1356 params->rmask |= 1 << var;
1362 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1365 memset(params, 0, sizeof(*params));
1366 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1367 _snd_pcm_hw_param_any(params, k);
1368 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1369 _snd_pcm_hw_param_any(params, k);
1373 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1376 * snd_pcm_hw_param_value - return @params field @var value
1377 * @params: the hw_params instance
1378 * @var: parameter to retrieve
1379 * @dir: pointer to the direction (-1,0,1) or %NULL
1381 * Return the value for field @var if it's fixed in configuration space
1382 * defined by @params. Return -%EINVAL otherwise.
1384 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1385 snd_pcm_hw_param_t var, int *dir)
1387 if (hw_is_mask(var)) {
1388 const struct snd_mask *mask = hw_param_mask_c(params, var);
1389 if (!snd_mask_single(mask))
1393 return snd_mask_value(mask);
1395 if (hw_is_interval(var)) {
1396 const struct snd_interval *i = hw_param_interval_c(params, var);
1397 if (!snd_interval_single(i))
1401 return snd_interval_value(i);
1406 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1408 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1409 snd_pcm_hw_param_t var)
1411 if (hw_is_mask(var)) {
1412 snd_mask_none(hw_param_mask(params, var));
1413 params->cmask |= 1 << var;
1414 params->rmask |= 1 << var;
1415 } else if (hw_is_interval(var)) {
1416 snd_interval_none(hw_param_interval(params, var));
1417 params->cmask |= 1 << var;
1418 params->rmask |= 1 << var;
1424 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1426 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1427 snd_pcm_hw_param_t var)
1430 if (hw_is_mask(var))
1431 changed = snd_mask_refine_first(hw_param_mask(params, var));
1432 else if (hw_is_interval(var))
1433 changed = snd_interval_refine_first(hw_param_interval(params, var));
1437 params->cmask |= 1 << var;
1438 params->rmask |= 1 << var;
1445 * snd_pcm_hw_param_first - refine config space and return minimum value
1446 * @pcm: PCM instance
1447 * @params: the hw_params instance
1448 * @var: parameter to retrieve
1449 * @dir: pointer to the direction (-1,0,1) or %NULL
1451 * Inside configuration space defined by @params remove from @var all
1452 * values > minimum. Reduce configuration space accordingly.
1453 * Return the minimum.
1455 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1456 struct snd_pcm_hw_params *params,
1457 snd_pcm_hw_param_t var, int *dir)
1459 int changed = _snd_pcm_hw_param_first(params, var);
1462 if (params->rmask) {
1463 int err = snd_pcm_hw_refine(pcm, params);
1464 if (snd_BUG_ON(err < 0))
1467 return snd_pcm_hw_param_value(params, var, dir);
1470 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1472 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1473 snd_pcm_hw_param_t var)
1476 if (hw_is_mask(var))
1477 changed = snd_mask_refine_last(hw_param_mask(params, var));
1478 else if (hw_is_interval(var))
1479 changed = snd_interval_refine_last(hw_param_interval(params, var));
1483 params->cmask |= 1 << var;
1484 params->rmask |= 1 << var;
1491 * snd_pcm_hw_param_last - refine config space and return maximum value
1492 * @pcm: PCM instance
1493 * @params: the hw_params instance
1494 * @var: parameter to retrieve
1495 * @dir: pointer to the direction (-1,0,1) or %NULL
1497 * Inside configuration space defined by @params remove from @var all
1498 * values < maximum. Reduce configuration space accordingly.
1499 * Return the maximum.
1501 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1502 struct snd_pcm_hw_params *params,
1503 snd_pcm_hw_param_t var, int *dir)
1505 int changed = _snd_pcm_hw_param_last(params, var);
1508 if (params->rmask) {
1509 int err = snd_pcm_hw_refine(pcm, params);
1510 if (snd_BUG_ON(err < 0))
1513 return snd_pcm_hw_param_value(params, var, dir);
1516 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1519 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1520 * @pcm: PCM instance
1521 * @params: the hw_params instance
1523 * Choose one configuration from configuration space defined by @params.
1524 * The configuration chosen is that obtained fixing in this order:
1525 * first access, first format, first subformat, min channels,
1526 * min rate, min period time, max buffer size, min tick time
1528 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1529 struct snd_pcm_hw_params *params)
1531 static int vars[] = {
1532 SNDRV_PCM_HW_PARAM_ACCESS,
1533 SNDRV_PCM_HW_PARAM_FORMAT,
1534 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1535 SNDRV_PCM_HW_PARAM_CHANNELS,
1536 SNDRV_PCM_HW_PARAM_RATE,
1537 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1538 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1539 SNDRV_PCM_HW_PARAM_TICK_TIME,
1544 for (v = vars; *v != -1; v++) {
1545 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1546 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1548 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1549 if (snd_BUG_ON(err < 0))
1555 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1558 struct snd_pcm_runtime *runtime = substream->runtime;
1559 unsigned long flags;
1560 snd_pcm_stream_lock_irqsave(substream, flags);
1561 if (snd_pcm_running(substream) &&
1562 snd_pcm_update_hw_ptr(substream) >= 0)
1563 runtime->status->hw_ptr %= runtime->buffer_size;
1565 runtime->status->hw_ptr = 0;
1566 snd_pcm_stream_unlock_irqrestore(substream, flags);
1570 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1573 struct snd_pcm_channel_info *info = arg;
1574 struct snd_pcm_runtime *runtime = substream->runtime;
1576 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1580 width = snd_pcm_format_physical_width(runtime->format);
1584 switch (runtime->access) {
1585 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1586 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1587 info->first = info->channel * width;
1588 info->step = runtime->channels * width;
1590 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1591 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1593 size_t size = runtime->dma_bytes / runtime->channels;
1594 info->first = info->channel * size * 8;
1605 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1608 struct snd_pcm_hw_params *params = arg;
1609 snd_pcm_format_t format;
1610 int channels, width;
1612 params->fifo_size = substream->runtime->hw.fifo_size;
1613 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1614 format = params_format(params);
1615 channels = params_channels(params);
1616 width = snd_pcm_format_physical_width(format);
1617 params->fifo_size /= width * channels;
1623 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1624 * @substream: the pcm substream instance
1625 * @cmd: ioctl command
1626 * @arg: ioctl argument
1628 * Processes the generic ioctl commands for PCM.
1629 * Can be passed as the ioctl callback for PCM ops.
1631 * Returns zero if successful, or a negative error code on failure.
1633 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1634 unsigned int cmd, void *arg)
1637 case SNDRV_PCM_IOCTL1_INFO:
1639 case SNDRV_PCM_IOCTL1_RESET:
1640 return snd_pcm_lib_ioctl_reset(substream, arg);
1641 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1642 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1643 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1644 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1649 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1652 * snd_pcm_period_elapsed - update the pcm status for the next period
1653 * @substream: the pcm substream instance
1655 * This function is called from the interrupt handler when the
1656 * PCM has processed the period size. It will update the current
1657 * pointer, wake up sleepers, etc.
1659 * Even if more than one periods have elapsed since the last call, you
1660 * have to call this only once.
1662 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1664 struct snd_pcm_runtime *runtime;
1665 unsigned long flags;
1667 if (PCM_RUNTIME_CHECK(substream))
1669 runtime = substream->runtime;
1671 if (runtime->transfer_ack_begin)
1672 runtime->transfer_ack_begin(substream);
1674 snd_pcm_stream_lock_irqsave(substream, flags);
1675 if (!snd_pcm_running(substream) ||
1676 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1679 if (substream->timer_running)
1680 snd_timer_interrupt(substream->timer, 1);
1682 snd_pcm_stream_unlock_irqrestore(substream, flags);
1683 if (runtime->transfer_ack_end)
1684 runtime->transfer_ack_end(substream);
1685 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1688 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1691 * Wait until avail_min data becomes available
1692 * Returns a negative error code if any error occurs during operation.
1693 * The available space is stored on availp. When err = 0 and avail = 0
1694 * on the capture stream, it indicates the stream is in DRAINING state.
1696 static int wait_for_avail_min(struct snd_pcm_substream *substream,
1697 snd_pcm_uframes_t *availp)
1699 struct snd_pcm_runtime *runtime = substream->runtime;
1700 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1703 snd_pcm_uframes_t avail = 0;
1706 init_waitqueue_entry(&wait, current);
1707 add_wait_queue(&runtime->sleep, &wait);
1709 if (signal_pending(current)) {
1713 set_current_state(TASK_INTERRUPTIBLE);
1714 snd_pcm_stream_unlock_irq(substream);
1715 tout = schedule_timeout(msecs_to_jiffies(10000));
1716 snd_pcm_stream_lock_irq(substream);
1717 switch (runtime->status->state) {
1718 case SNDRV_PCM_STATE_SUSPENDED:
1721 case SNDRV_PCM_STATE_XRUN:
1724 case SNDRV_PCM_STATE_DRAINING:
1728 avail = 0; /* indicate draining */
1730 case SNDRV_PCM_STATE_OPEN:
1731 case SNDRV_PCM_STATE_SETUP:
1732 case SNDRV_PCM_STATE_DISCONNECTED:
1737 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1738 is_playback ? "playback" : "capture");
1743 avail = snd_pcm_playback_avail(runtime);
1745 avail = snd_pcm_capture_avail(runtime);
1746 if (avail >= runtime->control->avail_min)
1750 remove_wait_queue(&runtime->sleep, &wait);
1755 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1757 unsigned long data, unsigned int off,
1758 snd_pcm_uframes_t frames)
1760 struct snd_pcm_runtime *runtime = substream->runtime;
1762 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1763 if (substream->ops->copy) {
1764 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1767 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1768 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1774 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1775 unsigned long data, unsigned int off,
1776 snd_pcm_uframes_t size);
1778 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1780 snd_pcm_uframes_t size,
1782 transfer_f transfer)
1784 struct snd_pcm_runtime *runtime = substream->runtime;
1785 snd_pcm_uframes_t xfer = 0;
1786 snd_pcm_uframes_t offset = 0;
1792 snd_pcm_stream_lock_irq(substream);
1793 switch (runtime->status->state) {
1794 case SNDRV_PCM_STATE_PREPARED:
1795 case SNDRV_PCM_STATE_RUNNING:
1796 case SNDRV_PCM_STATE_PAUSED:
1798 case SNDRV_PCM_STATE_XRUN:
1801 case SNDRV_PCM_STATE_SUSPENDED:
1809 runtime->nowake = 1;
1811 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1812 snd_pcm_uframes_t avail;
1813 snd_pcm_uframes_t cont;
1814 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1815 snd_pcm_update_hw_ptr(substream);
1816 avail = snd_pcm_playback_avail(runtime);
1822 err = wait_for_avail_min(substream, &avail);
1826 frames = size > avail ? avail : size;
1827 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1830 if (snd_BUG_ON(!frames)) {
1831 runtime->nowake = 0;
1832 snd_pcm_stream_unlock_irq(substream);
1835 appl_ptr = runtime->control->appl_ptr;
1836 appl_ofs = appl_ptr % runtime->buffer_size;
1837 snd_pcm_stream_unlock_irq(substream);
1838 err = transfer(substream, appl_ofs, data, offset, frames);
1839 snd_pcm_stream_lock_irq(substream);
1842 switch (runtime->status->state) {
1843 case SNDRV_PCM_STATE_XRUN:
1846 case SNDRV_PCM_STATE_SUSPENDED:
1853 if (appl_ptr >= runtime->boundary)
1854 appl_ptr -= runtime->boundary;
1855 runtime->control->appl_ptr = appl_ptr;
1856 if (substream->ops->ack)
1857 substream->ops->ack(substream);
1862 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1863 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1864 err = snd_pcm_start(substream);
1870 runtime->nowake = 0;
1871 if (xfer > 0 && err >= 0)
1872 snd_pcm_update_state(substream, runtime);
1873 snd_pcm_stream_unlock_irq(substream);
1874 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1877 /* sanity-check for read/write methods */
1878 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1880 struct snd_pcm_runtime *runtime;
1881 if (PCM_RUNTIME_CHECK(substream))
1883 runtime = substream->runtime;
1884 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1886 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1891 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1893 struct snd_pcm_runtime *runtime;
1897 err = pcm_sanity_check(substream);
1900 runtime = substream->runtime;
1901 nonblock = !!(substream->f_flags & O_NONBLOCK);
1903 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1904 runtime->channels > 1)
1906 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1907 snd_pcm_lib_write_transfer);
1910 EXPORT_SYMBOL(snd_pcm_lib_write);
1912 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1914 unsigned long data, unsigned int off,
1915 snd_pcm_uframes_t frames)
1917 struct snd_pcm_runtime *runtime = substream->runtime;
1919 void __user **bufs = (void __user **)data;
1920 int channels = runtime->channels;
1922 if (substream->ops->copy) {
1923 if (snd_BUG_ON(!substream->ops->silence))
1925 for (c = 0; c < channels; ++c, ++bufs) {
1926 if (*bufs == NULL) {
1927 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1930 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1931 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1936 /* default transfer behaviour */
1937 size_t dma_csize = runtime->dma_bytes / channels;
1938 for (c = 0; c < channels; ++c, ++bufs) {
1939 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1940 if (*bufs == NULL) {
1941 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1943 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1944 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1952 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1954 snd_pcm_uframes_t frames)
1956 struct snd_pcm_runtime *runtime;
1960 err = pcm_sanity_check(substream);
1963 runtime = substream->runtime;
1964 nonblock = !!(substream->f_flags & O_NONBLOCK);
1966 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1968 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1969 nonblock, snd_pcm_lib_writev_transfer);
1972 EXPORT_SYMBOL(snd_pcm_lib_writev);
1974 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
1976 unsigned long data, unsigned int off,
1977 snd_pcm_uframes_t frames)
1979 struct snd_pcm_runtime *runtime = substream->runtime;
1981 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1982 if (substream->ops->copy) {
1983 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1986 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1987 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
1993 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
1995 snd_pcm_uframes_t size,
1997 transfer_f transfer)
1999 struct snd_pcm_runtime *runtime = substream->runtime;
2000 snd_pcm_uframes_t xfer = 0;
2001 snd_pcm_uframes_t offset = 0;
2007 snd_pcm_stream_lock_irq(substream);
2008 switch (runtime->status->state) {
2009 case SNDRV_PCM_STATE_PREPARED:
2010 if (size >= runtime->start_threshold) {
2011 err = snd_pcm_start(substream);
2016 case SNDRV_PCM_STATE_DRAINING:
2017 case SNDRV_PCM_STATE_RUNNING:
2018 case SNDRV_PCM_STATE_PAUSED:
2020 case SNDRV_PCM_STATE_XRUN:
2023 case SNDRV_PCM_STATE_SUSPENDED:
2031 runtime->nowake = 1;
2033 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2034 snd_pcm_uframes_t avail;
2035 snd_pcm_uframes_t cont;
2036 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2037 snd_pcm_update_hw_ptr(substream);
2038 avail = snd_pcm_capture_avail(runtime);
2040 if (runtime->status->state ==
2041 SNDRV_PCM_STATE_DRAINING) {
2042 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2049 err = wait_for_avail_min(substream, &avail);
2053 continue; /* draining */
2055 frames = size > avail ? avail : size;
2056 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2059 if (snd_BUG_ON(!frames)) {
2060 runtime->nowake = 0;
2061 snd_pcm_stream_unlock_irq(substream);
2064 appl_ptr = runtime->control->appl_ptr;
2065 appl_ofs = appl_ptr % runtime->buffer_size;
2066 snd_pcm_stream_unlock_irq(substream);
2067 err = transfer(substream, appl_ofs, data, offset, frames);
2068 snd_pcm_stream_lock_irq(substream);
2071 switch (runtime->status->state) {
2072 case SNDRV_PCM_STATE_XRUN:
2075 case SNDRV_PCM_STATE_SUSPENDED:
2082 if (appl_ptr >= runtime->boundary)
2083 appl_ptr -= runtime->boundary;
2084 runtime->control->appl_ptr = appl_ptr;
2085 if (substream->ops->ack)
2086 substream->ops->ack(substream);
2093 runtime->nowake = 0;
2094 if (xfer > 0 && err >= 0)
2095 snd_pcm_update_state(substream, runtime);
2096 snd_pcm_stream_unlock_irq(substream);
2097 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2100 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2102 struct snd_pcm_runtime *runtime;
2106 err = pcm_sanity_check(substream);
2109 runtime = substream->runtime;
2110 nonblock = !!(substream->f_flags & O_NONBLOCK);
2111 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2113 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2116 EXPORT_SYMBOL(snd_pcm_lib_read);
2118 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2120 unsigned long data, unsigned int off,
2121 snd_pcm_uframes_t frames)
2123 struct snd_pcm_runtime *runtime = substream->runtime;
2125 void __user **bufs = (void __user **)data;
2126 int channels = runtime->channels;
2128 if (substream->ops->copy) {
2129 for (c = 0; c < channels; ++c, ++bufs) {
2133 buf = *bufs + samples_to_bytes(runtime, off);
2134 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2138 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2139 for (c = 0; c < channels; ++c, ++bufs) {
2145 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2146 buf = *bufs + samples_to_bytes(runtime, off);
2147 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2154 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2156 snd_pcm_uframes_t frames)
2158 struct snd_pcm_runtime *runtime;
2162 err = pcm_sanity_check(substream);
2165 runtime = substream->runtime;
2166 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2169 nonblock = !!(substream->f_flags & O_NONBLOCK);
2170 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2172 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2175 EXPORT_SYMBOL(snd_pcm_lib_readv);