2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
24 #include <linux/slab.h>
25 #include <linux/time.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 = (ofs + frames) - runtime->buffer_size;
84 runtime->silence_start = ofs - runtime->silence_filled;
86 if ((snd_pcm_sframes_t)runtime->silence_start < 0)
87 runtime->silence_start += runtime->boundary;
89 frames = runtime->buffer_size - runtime->silence_filled;
91 snd_assert(frames <= runtime->buffer_size, return);
94 ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size;
96 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
97 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
98 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
99 if (substream->ops->silence) {
101 err = substream->ops->silence(substream, -1, ofs, transfer);
102 snd_assert(err >= 0, );
104 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
105 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
109 unsigned int channels = runtime->channels;
110 if (substream->ops->silence) {
111 for (c = 0; c < channels; ++c) {
113 err = substream->ops->silence(substream, c, ofs, transfer);
114 snd_assert(err >= 0, );
117 size_t dma_csize = runtime->dma_bytes / channels;
118 for (c = 0; c < channels; ++c) {
119 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
120 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
124 runtime->silence_filled += transfer;
130 static void xrun(struct snd_pcm_substream *substream)
132 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
133 #ifdef CONFIG_SND_DEBUG
134 if (substream->pstr->xrun_debug) {
135 snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n",
136 substream->pcm->card->number,
137 substream->pcm->device,
138 substream->stream ? 'c' : 'p');
139 if (substream->pstr->xrun_debug > 1)
145 static inline snd_pcm_uframes_t snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
146 struct snd_pcm_runtime *runtime)
148 snd_pcm_uframes_t pos;
150 pos = substream->ops->pointer(substream);
151 if (pos == SNDRV_PCM_POS_XRUN)
152 return pos; /* XRUN */
153 if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP)
154 getnstimeofday((struct timespec *)&runtime->status->tstamp);
155 #ifdef CONFIG_SND_DEBUG
156 if (pos >= runtime->buffer_size) {
157 snd_printk(KERN_ERR "BUG: stream = %i, pos = 0x%lx, buffer size = 0x%lx, period size = 0x%lx\n", substream->stream, pos, runtime->buffer_size, runtime->period_size);
160 pos -= pos % runtime->min_align;
164 static inline int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
165 struct snd_pcm_runtime *runtime)
167 snd_pcm_uframes_t avail;
169 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
170 avail = snd_pcm_playback_avail(runtime);
172 avail = snd_pcm_capture_avail(runtime);
173 if (avail > runtime->avail_max)
174 runtime->avail_max = avail;
175 if (avail >= runtime->stop_threshold) {
176 if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
177 snd_pcm_drain_done(substream);
182 if (avail >= runtime->control->avail_min)
183 wake_up(&runtime->sleep);
187 static inline int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
189 struct snd_pcm_runtime *runtime = substream->runtime;
190 snd_pcm_uframes_t pos;
191 snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt;
192 snd_pcm_sframes_t delta;
194 pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
195 if (pos == SNDRV_PCM_POS_XRUN) {
199 if (runtime->period_size == runtime->buffer_size)
201 new_hw_ptr = runtime->hw_ptr_base + pos;
202 hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
204 delta = hw_ptr_interrupt - new_hw_ptr;
206 if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
207 #ifdef CONFIG_SND_DEBUG
208 if (runtime->periods > 1 && substream->pstr->xrun_debug) {
209 snd_printd(KERN_ERR "Unexpected hw_pointer value [1] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2);
210 if (substream->pstr->xrun_debug > 1)
217 runtime->hw_ptr_base += runtime->buffer_size;
218 if (runtime->hw_ptr_base == runtime->boundary)
219 runtime->hw_ptr_base = 0;
220 new_hw_ptr = runtime->hw_ptr_base + pos;
223 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
224 runtime->silence_size > 0)
225 snd_pcm_playback_silence(substream, new_hw_ptr);
227 runtime->status->hw_ptr = new_hw_ptr;
228 runtime->hw_ptr_interrupt = new_hw_ptr - new_hw_ptr % runtime->period_size;
230 return snd_pcm_update_hw_ptr_post(substream, runtime);
233 /* CAUTION: call it with irq disabled */
234 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
236 struct snd_pcm_runtime *runtime = substream->runtime;
237 snd_pcm_uframes_t pos;
238 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr;
239 snd_pcm_sframes_t delta;
241 old_hw_ptr = runtime->status->hw_ptr;
242 pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
243 if (pos == SNDRV_PCM_POS_XRUN) {
247 new_hw_ptr = runtime->hw_ptr_base + pos;
249 delta = old_hw_ptr - new_hw_ptr;
251 if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
252 #ifdef CONFIG_SND_DEBUG
253 if (runtime->periods > 2 && substream->pstr->xrun_debug) {
254 snd_printd(KERN_ERR "Unexpected hw_pointer value [2] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2);
255 if (substream->pstr->xrun_debug > 1)
261 runtime->hw_ptr_base += runtime->buffer_size;
262 if (runtime->hw_ptr_base == runtime->boundary)
263 runtime->hw_ptr_base = 0;
264 new_hw_ptr = runtime->hw_ptr_base + pos;
266 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
267 runtime->silence_size > 0)
268 snd_pcm_playback_silence(substream, new_hw_ptr);
270 runtime->status->hw_ptr = new_hw_ptr;
272 return snd_pcm_update_hw_ptr_post(substream, runtime);
276 * snd_pcm_set_ops - set the PCM operators
277 * @pcm: the pcm instance
278 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
279 * @ops: the operator table
281 * Sets the given PCM operators to the pcm instance.
283 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
285 struct snd_pcm_str *stream = &pcm->streams[direction];
286 struct snd_pcm_substream *substream;
288 for (substream = stream->substream; substream != NULL; substream = substream->next)
289 substream->ops = ops;
294 * snd_pcm_sync - set the PCM sync id
295 * @substream: the pcm substream
297 * Sets the PCM sync identifier for the card.
299 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
301 struct snd_pcm_runtime *runtime = substream->runtime;
303 runtime->sync.id32[0] = substream->pcm->card->number;
304 runtime->sync.id32[1] = -1;
305 runtime->sync.id32[2] = -1;
306 runtime->sync.id32[3] = -1;
310 * Standard ioctl routine
313 /* Code taken from alsa-lib */
314 #define assert(a) snd_assert((a), return -EINVAL)
316 static inline unsigned int div32(unsigned int a, unsigned int b,
327 static inline unsigned int div_down(unsigned int a, unsigned int b)
334 static inline unsigned int div_up(unsigned int a, unsigned int b)
346 static inline unsigned int mul(unsigned int a, unsigned int b)
350 if (div_down(UINT_MAX, a) < b)
355 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
356 unsigned int c, unsigned int *r)
358 u_int64_t n = (u_int64_t) a * b;
372 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
375 assert(!snd_interval_empty(i));
378 i->openmin = openmin;
380 } else if (i->min == min && !i->openmin && openmin) {
390 if (snd_interval_checkempty(i)) {
391 snd_interval_none(i);
397 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
400 assert(!snd_interval_empty(i));
403 i->openmax = openmax;
405 } else if (i->max == max && !i->openmax && openmax) {
415 if (snd_interval_checkempty(i)) {
416 snd_interval_none(i);
423 * snd_interval_refine - refine the interval value of configurator
424 * @i: the interval value to refine
425 * @v: the interval value to refer to
427 * Refines the interval value with the reference value.
428 * The interval is changed to the range satisfying both intervals.
429 * The interval status (min, max, integer, etc.) are evaluated.
431 * Returns non-zero if the value is changed, zero if not changed.
433 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
436 assert(!snd_interval_empty(i));
437 if (i->min < v->min) {
439 i->openmin = v->openmin;
441 } else if (i->min == v->min && !i->openmin && v->openmin) {
445 if (i->max > v->max) {
447 i->openmax = v->openmax;
449 } else if (i->max == v->max && !i->openmax && v->openmax) {
453 if (!i->integer && v->integer) {
466 } else if (!i->openmin && !i->openmax && i->min == i->max)
468 if (snd_interval_checkempty(i)) {
469 snd_interval_none(i);
475 static int snd_interval_refine_first(struct snd_interval *i)
477 assert(!snd_interval_empty(i));
478 if (snd_interval_single(i))
481 i->openmax = i->openmin;
487 static int snd_interval_refine_last(struct snd_interval *i)
489 assert(!snd_interval_empty(i));
490 if (snd_interval_single(i))
493 i->openmin = i->openmax;
499 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
501 struct snd_interval t;
504 t.openmin = t.openmax = 0;
506 return snd_interval_refine(i, &t);
509 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
511 if (a->empty || b->empty) {
512 snd_interval_none(c);
516 c->min = mul(a->min, b->min);
517 c->openmin = (a->openmin || b->openmin);
518 c->max = mul(a->max, b->max);
519 c->openmax = (a->openmax || b->openmax);
520 c->integer = (a->integer && b->integer);
524 * snd_interval_div - refine the interval value with division
531 * Returns non-zero if the value is changed, zero if not changed.
533 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
536 if (a->empty || b->empty) {
537 snd_interval_none(c);
541 c->min = div32(a->min, b->max, &r);
542 c->openmin = (r || a->openmin || b->openmax);
544 c->max = div32(a->max, b->min, &r);
549 c->openmax = (a->openmax || b->openmin);
558 * snd_interval_muldivk - refine the interval value
561 * @k: divisor (as integer)
566 * Returns non-zero if the value is changed, zero if not changed.
568 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
569 unsigned int k, struct snd_interval *c)
572 if (a->empty || b->empty) {
573 snd_interval_none(c);
577 c->min = muldiv32(a->min, b->min, k, &r);
578 c->openmin = (r || a->openmin || b->openmin);
579 c->max = muldiv32(a->max, b->max, k, &r);
584 c->openmax = (a->openmax || b->openmax);
589 * snd_interval_mulkdiv - refine the interval value
591 * @k: dividend 2 (as integer)
597 * Returns non-zero if the value is changed, zero if not changed.
599 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
600 const struct snd_interval *b, struct snd_interval *c)
603 if (a->empty || b->empty) {
604 snd_interval_none(c);
608 c->min = muldiv32(a->min, k, b->max, &r);
609 c->openmin = (r || a->openmin || b->openmax);
611 c->max = muldiv32(a->max, k, b->min, &r);
616 c->openmax = (a->openmax || b->openmin);
629 * snd_interval_ratnum - refine the interval value
630 * @i: interval to refine
631 * @rats_count: number of ratnum_t
632 * @rats: ratnum_t array
633 * @nump: pointer to store the resultant numerator
634 * @denp: pointer to store the resultant denominator
636 * Returns non-zero if the value is changed, zero if not changed.
638 int snd_interval_ratnum(struct snd_interval *i,
639 unsigned int rats_count, struct snd_ratnum *rats,
640 unsigned int *nump, unsigned int *denp)
642 unsigned int best_num, best_diff, best_den;
644 struct snd_interval t;
647 best_num = best_den = best_diff = 0;
648 for (k = 0; k < rats_count; ++k) {
649 unsigned int num = rats[k].num;
651 unsigned int q = i->min;
655 den = div_down(num, q);
656 if (den < rats[k].den_min)
658 if (den > rats[k].den_max)
659 den = rats[k].den_max;
662 r = (den - rats[k].den_min) % rats[k].den_step;
666 diff = num - q * den;
668 diff * best_den < best_diff * den) {
678 t.min = div_down(best_num, best_den);
679 t.openmin = !!(best_num % best_den);
681 best_num = best_den = best_diff = 0;
682 for (k = 0; k < rats_count; ++k) {
683 unsigned int num = rats[k].num;
685 unsigned int q = i->max;
691 den = div_up(num, q);
692 if (den > rats[k].den_max)
694 if (den < rats[k].den_min)
695 den = rats[k].den_min;
698 r = (den - rats[k].den_min) % rats[k].den_step;
700 den += rats[k].den_step - r;
702 diff = q * den - num;
704 diff * best_den < best_diff * den) {
714 t.max = div_up(best_num, best_den);
715 t.openmax = !!(best_num % best_den);
717 err = snd_interval_refine(i, &t);
721 if (snd_interval_single(i)) {
731 * snd_interval_ratden - refine the interval value
732 * @i: interval to refine
733 * @rats_count: number of struct ratden
734 * @rats: struct ratden array
735 * @nump: pointer to store the resultant numerator
736 * @denp: pointer to store the resultant denominator
738 * Returns non-zero if the value is changed, zero if not changed.
740 static int snd_interval_ratden(struct snd_interval *i,
741 unsigned int rats_count, struct snd_ratden *rats,
742 unsigned int *nump, unsigned int *denp)
744 unsigned int best_num, best_diff, best_den;
746 struct snd_interval t;
749 best_num = best_den = best_diff = 0;
750 for (k = 0; k < rats_count; ++k) {
752 unsigned int den = rats[k].den;
753 unsigned int q = i->min;
756 if (num > rats[k].num_max)
758 if (num < rats[k].num_min)
759 num = rats[k].num_max;
762 r = (num - rats[k].num_min) % rats[k].num_step;
764 num += rats[k].num_step - r;
766 diff = num - q * den;
768 diff * best_den < best_diff * den) {
778 t.min = div_down(best_num, best_den);
779 t.openmin = !!(best_num % best_den);
781 best_num = best_den = best_diff = 0;
782 for (k = 0; k < rats_count; ++k) {
784 unsigned int den = rats[k].den;
785 unsigned int q = i->max;
788 if (num < rats[k].num_min)
790 if (num > rats[k].num_max)
791 num = rats[k].num_max;
794 r = (num - rats[k].num_min) % rats[k].num_step;
798 diff = q * den - num;
800 diff * best_den < best_diff * den) {
810 t.max = div_up(best_num, best_den);
811 t.openmax = !!(best_num % best_den);
813 err = snd_interval_refine(i, &t);
817 if (snd_interval_single(i)) {
827 * snd_interval_list - refine the interval value from the list
828 * @i: the interval value to refine
829 * @count: the number of elements in the list
830 * @list: the value list
831 * @mask: the bit-mask to evaluate
833 * Refines the interval value from the list.
834 * When mask is non-zero, only the elements corresponding to bit 1 are
837 * Returns non-zero if the value is changed, zero if not changed.
839 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
843 for (k = 0; k < count; k++) {
844 if (mask && !(mask & (1 << k)))
846 if (i->min == list[k] && !i->openmin)
848 if (i->min < list[k]) {
858 for (k = count; k-- > 0;) {
859 if (mask && !(mask & (1 << k)))
861 if (i->max == list[k] && !i->openmax)
863 if (i->max > list[k]) {
873 if (snd_interval_checkempty(i)) {
880 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
884 n = (i->min - min) % step;
885 if (n != 0 || i->openmin) {
889 n = (i->max - min) % step;
890 if (n != 0 || i->openmax) {
894 if (snd_interval_checkempty(i)) {
901 /* Info constraints helpers */
904 * snd_pcm_hw_rule_add - add the hw-constraint rule
905 * @runtime: the pcm runtime instance
906 * @cond: condition bits
907 * @var: the variable to evaluate
908 * @func: the evaluation function
909 * @private: the private data pointer passed to function
910 * @dep: the dependent variables
912 * Returns zero if successful, or a negative error code on failure.
914 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
916 snd_pcm_hw_rule_func_t func, void *private,
919 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
920 struct snd_pcm_hw_rule *c;
924 if (constrs->rules_num >= constrs->rules_all) {
925 struct snd_pcm_hw_rule *new;
926 unsigned int new_rules = constrs->rules_all + 16;
927 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
930 if (constrs->rules) {
931 memcpy(new, constrs->rules,
932 constrs->rules_num * sizeof(*c));
933 kfree(constrs->rules);
935 constrs->rules = new;
936 constrs->rules_all = new_rules;
938 c = &constrs->rules[constrs->rules_num];
942 c->private = private;
945 snd_assert(k < ARRAY_SIZE(c->deps), return -EINVAL);
949 dep = va_arg(args, int);
951 constrs->rules_num++;
957 * snd_pcm_hw_constraint_mask
958 * @runtime: PCM runtime instance
959 * @var: hw_params variable to apply the mask
960 * @mask: the bitmap mask
962 * Apply the constraint of the given bitmap mask to a mask parameter.
964 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
967 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
968 struct snd_mask *maskp = constrs_mask(constrs, var);
969 *maskp->bits &= mask;
970 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
971 if (*maskp->bits == 0)
977 * snd_pcm_hw_constraint_mask64
978 * @runtime: PCM runtime instance
979 * @var: hw_params variable to apply the mask
980 * @mask: the 64bit bitmap mask
982 * Apply the constraint of the given bitmap mask to a mask parameter.
984 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
987 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
988 struct snd_mask *maskp = constrs_mask(constrs, var);
989 maskp->bits[0] &= (u_int32_t)mask;
990 maskp->bits[1] &= (u_int32_t)(mask >> 32);
991 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
992 if (! maskp->bits[0] && ! maskp->bits[1])
998 * snd_pcm_hw_constraint_integer
999 * @runtime: PCM runtime instance
1000 * @var: hw_params variable to apply the integer constraint
1002 * Apply the constraint of integer to an interval parameter.
1004 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1006 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1007 return snd_interval_setinteger(constrs_interval(constrs, var));
1011 * snd_pcm_hw_constraint_minmax
1012 * @runtime: PCM runtime instance
1013 * @var: hw_params variable to apply the range
1014 * @min: the minimal value
1015 * @max: the maximal value
1017 * Apply the min/max range constraint to an interval parameter.
1019 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1020 unsigned int min, unsigned int max)
1022 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1023 struct snd_interval t;
1026 t.openmin = t.openmax = 0;
1028 return snd_interval_refine(constrs_interval(constrs, var), &t);
1031 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1032 struct snd_pcm_hw_rule *rule)
1034 struct snd_pcm_hw_constraint_list *list = rule->private;
1035 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1040 * snd_pcm_hw_constraint_list
1041 * @runtime: PCM runtime instance
1042 * @cond: condition bits
1043 * @var: hw_params variable to apply the list constraint
1046 * Apply the list of constraints to an interval parameter.
1048 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1050 snd_pcm_hw_param_t var,
1051 struct snd_pcm_hw_constraint_list *l)
1053 return snd_pcm_hw_rule_add(runtime, cond, var,
1054 snd_pcm_hw_rule_list, l,
1058 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1059 struct snd_pcm_hw_rule *rule)
1061 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1062 unsigned int num = 0, den = 0;
1064 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1065 r->nrats, r->rats, &num, &den);
1066 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1067 params->rate_num = num;
1068 params->rate_den = den;
1074 * snd_pcm_hw_constraint_ratnums
1075 * @runtime: PCM runtime instance
1076 * @cond: condition bits
1077 * @var: hw_params variable to apply the ratnums constraint
1078 * @r: struct snd_ratnums constriants
1080 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1082 snd_pcm_hw_param_t var,
1083 struct snd_pcm_hw_constraint_ratnums *r)
1085 return snd_pcm_hw_rule_add(runtime, cond, var,
1086 snd_pcm_hw_rule_ratnums, r,
1090 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1091 struct snd_pcm_hw_rule *rule)
1093 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1094 unsigned int num = 0, den = 0;
1095 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1096 r->nrats, r->rats, &num, &den);
1097 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1098 params->rate_num = num;
1099 params->rate_den = den;
1105 * snd_pcm_hw_constraint_ratdens
1106 * @runtime: PCM runtime instance
1107 * @cond: condition bits
1108 * @var: hw_params variable to apply the ratdens constraint
1109 * @r: struct snd_ratdens constriants
1111 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1113 snd_pcm_hw_param_t var,
1114 struct snd_pcm_hw_constraint_ratdens *r)
1116 return snd_pcm_hw_rule_add(runtime, cond, var,
1117 snd_pcm_hw_rule_ratdens, r,
1121 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1122 struct snd_pcm_hw_rule *rule)
1124 unsigned int l = (unsigned long) rule->private;
1125 int width = l & 0xffff;
1126 unsigned int msbits = l >> 16;
1127 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1128 if (snd_interval_single(i) && snd_interval_value(i) == width)
1129 params->msbits = msbits;
1134 * snd_pcm_hw_constraint_msbits
1135 * @runtime: PCM runtime instance
1136 * @cond: condition bits
1137 * @width: sample bits width
1138 * @msbits: msbits width
1140 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1143 unsigned int msbits)
1145 unsigned long l = (msbits << 16) | width;
1146 return snd_pcm_hw_rule_add(runtime, cond, -1,
1147 snd_pcm_hw_rule_msbits,
1149 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1152 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1153 struct snd_pcm_hw_rule *rule)
1155 unsigned long step = (unsigned long) rule->private;
1156 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1160 * snd_pcm_hw_constraint_step
1161 * @runtime: PCM runtime instance
1162 * @cond: condition bits
1163 * @var: hw_params variable to apply the step constraint
1166 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1168 snd_pcm_hw_param_t var,
1171 return snd_pcm_hw_rule_add(runtime, cond, var,
1172 snd_pcm_hw_rule_step, (void *) step,
1176 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1178 static int pow2_sizes[] = {
1179 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1180 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1181 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1182 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1184 return snd_interval_list(hw_param_interval(params, rule->var),
1185 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1189 * snd_pcm_hw_constraint_pow2
1190 * @runtime: PCM runtime instance
1191 * @cond: condition bits
1192 * @var: hw_params variable to apply the power-of-2 constraint
1194 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1196 snd_pcm_hw_param_t var)
1198 return snd_pcm_hw_rule_add(runtime, cond, var,
1199 snd_pcm_hw_rule_pow2, NULL,
1203 /* To use the same code we have in alsa-lib */
1204 #define assert(i) snd_assert((i), return -EINVAL)
1206 #define INT_MIN ((int)((unsigned int)INT_MAX+1))
1209 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1210 snd_pcm_hw_param_t var)
1212 if (hw_is_mask(var)) {
1213 snd_mask_any(hw_param_mask(params, var));
1214 params->cmask |= 1 << var;
1215 params->rmask |= 1 << var;
1218 if (hw_is_interval(var)) {
1219 snd_interval_any(hw_param_interval(params, var));
1220 params->cmask |= 1 << var;
1221 params->rmask |= 1 << var;
1229 * snd_pcm_hw_param_any
1231 int snd_pcm_hw_param_any(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1232 snd_pcm_hw_param_t var)
1234 _snd_pcm_hw_param_any(params, var);
1235 return snd_pcm_hw_refine(pcm, params);
1239 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1242 memset(params, 0, sizeof(*params));
1243 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1244 _snd_pcm_hw_param_any(params, k);
1245 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1246 _snd_pcm_hw_param_any(params, k);
1252 * snd_pcm_hw_params_any
1254 * Fill PARAMS with full configuration space boundaries
1256 int snd_pcm_hw_params_any(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params)
1258 _snd_pcm_hw_params_any(params);
1259 return snd_pcm_hw_refine(pcm, params);
1264 * snd_pcm_hw_param_value
1265 * @params: the hw_params instance
1266 * @var: parameter to retrieve
1267 * @dir: pointer to the direction (-1,0,1) or NULL
1269 * Return the value for field PAR if it's fixed in configuration space
1270 * defined by PARAMS. Return -EINVAL otherwise
1272 static int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1273 snd_pcm_hw_param_t var, int *dir)
1275 if (hw_is_mask(var)) {
1276 const struct snd_mask *mask = hw_param_mask_c(params, var);
1277 if (!snd_mask_single(mask))
1281 return snd_mask_value(mask);
1283 if (hw_is_interval(var)) {
1284 const struct snd_interval *i = hw_param_interval_c(params, var);
1285 if (!snd_interval_single(i))
1289 return snd_interval_value(i);
1296 * snd_pcm_hw_param_value_min
1297 * @params: the hw_params instance
1298 * @var: parameter to retrieve
1299 * @dir: pointer to the direction (-1,0,1) or NULL
1301 * Return the minimum value for field PAR.
1303 unsigned int snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
1304 snd_pcm_hw_param_t var, int *dir)
1306 if (hw_is_mask(var)) {
1309 return snd_mask_min(hw_param_mask_c(params, var));
1311 if (hw_is_interval(var)) {
1312 const struct snd_interval *i = hw_param_interval_c(params, var);
1315 return snd_interval_min(i);
1322 * snd_pcm_hw_param_value_max
1323 * @params: the hw_params instance
1324 * @var: parameter to retrieve
1325 * @dir: pointer to the direction (-1,0,1) or NULL
1327 * Return the maximum value for field PAR.
1329 unsigned int snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
1330 snd_pcm_hw_param_t var, int *dir)
1332 if (hw_is_mask(var)) {
1335 return snd_mask_max(hw_param_mask_c(params, var));
1337 if (hw_is_interval(var)) {
1338 const struct snd_interval *i = hw_param_interval_c(params, var);
1340 *dir = - (int) i->openmax;
1341 return snd_interval_max(i);
1347 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1348 snd_pcm_hw_param_t var)
1350 if (hw_is_mask(var)) {
1351 snd_mask_none(hw_param_mask(params, var));
1352 params->cmask |= 1 << var;
1353 params->rmask |= 1 << var;
1354 } else if (hw_is_interval(var)) {
1355 snd_interval_none(hw_param_interval(params, var));
1356 params->cmask |= 1 << var;
1357 params->rmask |= 1 << var;
1363 int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
1364 snd_pcm_hw_param_t var)
1367 assert(hw_is_interval(var));
1368 changed = snd_interval_setinteger(hw_param_interval(params, var));
1370 params->cmask |= 1 << var;
1371 params->rmask |= 1 << var;
1378 * snd_pcm_hw_param_setinteger
1380 * Inside configuration space defined by PARAMS remove from PAR all
1381 * non integer values. Reduce configuration space accordingly.
1382 * Return -EINVAL if the configuration space is empty
1384 int snd_pcm_hw_param_setinteger(struct snd_pcm_substream *pcm,
1385 struct snd_pcm_hw_params *params,
1386 snd_pcm_hw_param_t var)
1388 int changed = _snd_pcm_hw_param_setinteger(params, var);
1391 if (params->rmask) {
1392 int err = snd_pcm_hw_refine(pcm, params);
1400 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1401 snd_pcm_hw_param_t var)
1404 if (hw_is_mask(var))
1405 changed = snd_mask_refine_first(hw_param_mask(params, var));
1406 else if (hw_is_interval(var))
1407 changed = snd_interval_refine_first(hw_param_interval(params, var));
1413 params->cmask |= 1 << var;
1414 params->rmask |= 1 << var;
1421 * snd_pcm_hw_param_first
1422 * @pcm: PCM instance
1423 * @params: the hw_params instance
1424 * @var: parameter to retrieve
1425 * @dir: pointer to the direction (-1,0,1) or NULL
1427 * Inside configuration space defined by PARAMS remove from PAR all
1428 * values > minimum. Reduce configuration space accordingly.
1429 * Return the minimum.
1431 static int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1432 struct snd_pcm_hw_params *params,
1433 snd_pcm_hw_param_t var, int *dir)
1435 int changed = _snd_pcm_hw_param_first(params, var);
1438 if (params->rmask) {
1439 int err = snd_pcm_hw_refine(pcm, params);
1442 return snd_pcm_hw_param_value(params, var, dir);
1445 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1446 snd_pcm_hw_param_t var)
1449 if (hw_is_mask(var))
1450 changed = snd_mask_refine_last(hw_param_mask(params, var));
1451 else if (hw_is_interval(var))
1452 changed = snd_interval_refine_last(hw_param_interval(params, var));
1458 params->cmask |= 1 << var;
1459 params->rmask |= 1 << var;
1466 * snd_pcm_hw_param_last
1467 * @pcm: PCM instance
1468 * @params: the hw_params instance
1469 * @var: parameter to retrieve
1470 * @dir: pointer to the direction (-1,0,1) or NULL
1472 * Inside configuration space defined by PARAMS remove from PAR all
1473 * values < maximum. Reduce configuration space accordingly.
1474 * Return the maximum.
1476 static int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1477 struct snd_pcm_hw_params *params,
1478 snd_pcm_hw_param_t var, int *dir)
1480 int changed = _snd_pcm_hw_param_last(params, var);
1483 if (params->rmask) {
1484 int err = snd_pcm_hw_refine(pcm, params);
1487 return snd_pcm_hw_param_value(params, var, dir);
1490 int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
1491 snd_pcm_hw_param_t var, unsigned int val, int dir)
1498 } else if (dir < 0) {
1505 if (hw_is_mask(var))
1506 changed = snd_mask_refine_min(hw_param_mask(params, var), val + !!open);
1507 else if (hw_is_interval(var))
1508 changed = snd_interval_refine_min(hw_param_interval(params, var), val, open);
1514 params->cmask |= 1 << var;
1515 params->rmask |= 1 << var;
1521 * snd_pcm_hw_param_min
1522 * @pcm: PCM instance
1523 * @params: the hw_params instance
1524 * @var: parameter to retrieve
1525 * @val: minimal value
1526 * @dir: pointer to the direction (-1,0,1) or NULL
1528 * Inside configuration space defined by PARAMS remove from PAR all
1529 * values < VAL. Reduce configuration space accordingly.
1530 * Return new minimum or -EINVAL if the configuration space is empty
1532 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1533 snd_pcm_hw_param_t var, unsigned int val,
1536 int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
1539 if (params->rmask) {
1540 int err = snd_pcm_hw_refine(pcm, params);
1544 return snd_pcm_hw_param_value_min(params, var, dir);
1547 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
1548 snd_pcm_hw_param_t var, unsigned int val,
1556 } else if (dir > 0) {
1561 if (hw_is_mask(var)) {
1562 if (val == 0 && open) {
1563 snd_mask_none(hw_param_mask(params, var));
1566 changed = snd_mask_refine_max(hw_param_mask(params, var), val - !!open);
1567 } else if (hw_is_interval(var))
1568 changed = snd_interval_refine_max(hw_param_interval(params, var), val, open);
1574 params->cmask |= 1 << var;
1575 params->rmask |= 1 << var;
1581 * snd_pcm_hw_param_max
1582 * @pcm: PCM instance
1583 * @params: the hw_params instance
1584 * @var: parameter to retrieve
1585 * @val: maximal value
1586 * @dir: pointer to the direction (-1,0,1) or NULL
1588 * Inside configuration space defined by PARAMS remove from PAR all
1589 * values >= VAL + 1. Reduce configuration space accordingly.
1590 * Return new maximum or -EINVAL if the configuration space is empty
1592 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1593 snd_pcm_hw_param_t var, unsigned int val,
1596 int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
1599 if (params->rmask) {
1600 int err = snd_pcm_hw_refine(pcm, params);
1604 return snd_pcm_hw_param_value_max(params, var, dir);
1607 int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
1608 snd_pcm_hw_param_t var, unsigned int val, int dir)
1611 if (hw_is_mask(var)) {
1612 struct snd_mask *m = hw_param_mask(params, var);
1613 if (val == 0 && dir < 0) {
1621 changed = snd_mask_refine_set(hw_param_mask(params, var), val);
1623 } else if (hw_is_interval(var)) {
1624 struct snd_interval *i = hw_param_interval(params, var);
1625 if (val == 0 && dir < 0) {
1627 snd_interval_none(i);
1628 } else if (dir == 0)
1629 changed = snd_interval_refine_set(i, val);
1631 struct snd_interval t;
1643 changed = snd_interval_refine(i, &t);
1650 params->cmask |= 1 << var;
1651 params->rmask |= 1 << var;
1657 * snd_pcm_hw_param_set
1658 * @pcm: PCM instance
1659 * @params: the hw_params instance
1660 * @var: parameter to retrieve
1661 * @val: value to set
1662 * @dir: pointer to the direction (-1,0,1) or NULL
1664 * Inside configuration space defined by PARAMS remove from PAR all
1665 * values != VAL. Reduce configuration space accordingly.
1666 * Return VAL or -EINVAL if the configuration space is empty
1668 int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1669 snd_pcm_hw_param_t var, unsigned int val, int dir)
1671 int changed = _snd_pcm_hw_param_set(params, var, val, dir);
1674 if (params->rmask) {
1675 int err = snd_pcm_hw_refine(pcm, params);
1679 return snd_pcm_hw_param_value(params, var, NULL);
1682 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
1683 snd_pcm_hw_param_t var, const struct snd_mask *val)
1686 assert(hw_is_mask(var));
1687 changed = snd_mask_refine(hw_param_mask(params, var), val);
1689 params->cmask |= 1 << var;
1690 params->rmask |= 1 << var;
1696 * snd_pcm_hw_param_mask
1697 * @pcm: PCM instance
1698 * @params: the hw_params instance
1699 * @var: parameter to retrieve
1700 * @val: mask to apply
1702 * Inside configuration space defined by PARAMS remove from PAR all values
1703 * not contained in MASK. Reduce configuration space accordingly.
1704 * This function can be called only for SNDRV_PCM_HW_PARAM_ACCESS,
1705 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1706 * Return 0 on success or -EINVAL
1707 * if the configuration space is empty
1709 int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1710 snd_pcm_hw_param_t var, const struct snd_mask *val)
1712 int changed = _snd_pcm_hw_param_mask(params, var, val);
1715 if (params->rmask) {
1716 int err = snd_pcm_hw_refine(pcm, params);
1723 static int boundary_sub(int a, int adir,
1727 adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
1728 bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
1730 *cdir = adir - bdir;
1732 assert(*c > INT_MIN);
1734 } else if (*cdir == 2) {
1735 assert(*c < INT_MAX);
1741 static int boundary_lt(unsigned int a, int adir,
1742 unsigned int b, int bdir)
1744 assert(a > 0 || adir >= 0);
1745 assert(b > 0 || bdir >= 0);
1749 } else if (adir > 0)
1754 } else if (bdir > 0)
1756 return a < b || (a == b && adir < bdir);
1759 /* Return 1 if min is nearer to best than max */
1760 static int boundary_nearer(int min, int mindir,
1761 int best, int bestdir,
1762 int max, int maxdir)
1766 boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
1767 boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
1768 return boundary_lt(dmin, dmindir, dmax, dmaxdir);
1772 * snd_pcm_hw_param_near
1773 * @pcm: PCM instance
1774 * @params: the hw_params instance
1775 * @var: parameter to retrieve
1776 * @best: value to set
1777 * @dir: pointer to the direction (-1,0,1) or NULL
1779 * Inside configuration space defined by PARAMS set PAR to the available value
1780 * nearest to VAL. Reduce configuration space accordingly.
1781 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
1782 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1783 * Return the value found.
1785 int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params,
1786 snd_pcm_hw_param_t var, unsigned int best, int *dir)
1788 struct snd_pcm_hw_params *save = NULL;
1790 unsigned int saved_min;
1794 int valdir = dir ? *dir : 0;
1799 mindir = maxdir = valdir;
1802 else if (maxdir == 0)
1808 save = kmalloc(sizeof(*save), GFP_KERNEL);
1813 min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
1815 struct snd_pcm_hw_params *params1;
1818 if ((unsigned int)min == saved_min && mindir == valdir)
1820 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
1821 if (params1 == NULL) {
1826 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
1831 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
1838 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
1845 v = snd_pcm_hw_param_last(pcm, params, var, dir);
1847 v = snd_pcm_hw_param_first(pcm, params, var, dir);
1853 * snd_pcm_hw_param_choose
1854 * @pcm: PCM instance
1855 * @params: the hw_params instance
1857 * Choose one configuration from configuration space defined by PARAMS
1858 * The configuration chosen is that obtained fixing in this order:
1859 * first access, first format, first subformat, min channels,
1860 * min rate, min period time, max buffer size, min tick time
1862 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params)
1866 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_ACCESS, NULL);
1869 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_FORMAT, NULL);
1872 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_SUBFORMAT, NULL);
1875 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_CHANNELS, NULL);
1878 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_RATE, NULL);
1881 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_PERIOD_TIME, NULL);
1884 err = snd_pcm_hw_param_last(pcm, params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL);
1887 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_TICK_TIME, NULL);
1895 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1898 struct snd_pcm_runtime *runtime = substream->runtime;
1899 unsigned long flags;
1900 snd_pcm_stream_lock_irqsave(substream, flags);
1901 if (snd_pcm_running(substream) &&
1902 snd_pcm_update_hw_ptr(substream) >= 0)
1903 runtime->status->hw_ptr %= runtime->buffer_size;
1905 runtime->status->hw_ptr = 0;
1906 snd_pcm_stream_unlock_irqrestore(substream, flags);
1910 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1913 struct snd_pcm_channel_info *info = arg;
1914 struct snd_pcm_runtime *runtime = substream->runtime;
1916 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1920 width = snd_pcm_format_physical_width(runtime->format);
1924 switch (runtime->access) {
1925 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1926 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1927 info->first = info->channel * width;
1928 info->step = runtime->channels * width;
1930 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1931 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1933 size_t size = runtime->dma_bytes / runtime->channels;
1934 info->first = info->channel * size * 8;
1946 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1947 * @substream: the pcm substream instance
1948 * @cmd: ioctl command
1949 * @arg: ioctl argument
1951 * Processes the generic ioctl commands for PCM.
1952 * Can be passed as the ioctl callback for PCM ops.
1954 * Returns zero if successful, or a negative error code on failure.
1956 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1957 unsigned int cmd, void *arg)
1960 case SNDRV_PCM_IOCTL1_INFO:
1962 case SNDRV_PCM_IOCTL1_RESET:
1963 return snd_pcm_lib_ioctl_reset(substream, arg);
1964 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1965 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1974 static void snd_pcm_system_tick_set(struct snd_pcm_substream *substream,
1975 unsigned long ticks)
1977 struct snd_pcm_runtime *runtime = substream->runtime;
1979 del_timer(&runtime->tick_timer);
1981 ticks += (1000000 / HZ) - 1;
1982 ticks /= (1000000 / HZ);
1983 mod_timer(&runtime->tick_timer, jiffies + ticks);
1987 /* Temporary alias */
1988 void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks)
1990 snd_pcm_system_tick_set(substream, ticks);
1993 void snd_pcm_tick_prepare(struct snd_pcm_substream *substream)
1995 struct snd_pcm_runtime *runtime = substream->runtime;
1996 snd_pcm_uframes_t frames = ULONG_MAX;
1997 snd_pcm_uframes_t avail, dist;
2001 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2002 if (runtime->silence_size >= runtime->boundary) {
2004 } else if (runtime->silence_size > 0 &&
2005 runtime->silence_filled < runtime->buffer_size) {
2006 snd_pcm_sframes_t noise_dist;
2007 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
2008 if (noise_dist > (snd_pcm_sframes_t)runtime->silence_threshold)
2009 frames = noise_dist - runtime->silence_threshold;
2011 avail = snd_pcm_playback_avail(runtime);
2013 avail = snd_pcm_capture_avail(runtime);
2015 if (avail < runtime->control->avail_min) {
2016 snd_pcm_sframes_t n = runtime->control->avail_min - avail;
2017 if (n > 0 && frames > (snd_pcm_uframes_t)n)
2020 if (avail < runtime->buffer_size) {
2021 snd_pcm_sframes_t n = runtime->buffer_size - avail;
2022 if (n > 0 && frames > (snd_pcm_uframes_t)n)
2025 if (frames == ULONG_MAX) {
2026 snd_pcm_tick_set(substream, 0);
2029 dist = runtime->status->hw_ptr - runtime->hw_ptr_base;
2030 /* Distance to next interrupt */
2031 dist = runtime->period_size - dist % runtime->period_size;
2032 if (dist <= frames) {
2033 snd_pcm_tick_set(substream, 0);
2036 /* the base time is us */
2039 div64_32(&n, runtime->tick_time * runtime->rate, &r);
2040 ticks = n + (r > 0 ? 1 : 0);
2041 if (ticks < runtime->sleep_min)
2042 ticks = runtime->sleep_min;
2043 snd_pcm_tick_set(substream, (unsigned long) ticks);
2046 void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream)
2048 struct snd_pcm_runtime *runtime;
2049 unsigned long flags;
2051 snd_assert(substream != NULL, return);
2052 runtime = substream->runtime;
2053 snd_assert(runtime != NULL, return);
2055 snd_pcm_stream_lock_irqsave(substream, flags);
2056 if (!snd_pcm_running(substream) ||
2057 snd_pcm_update_hw_ptr(substream) < 0)
2059 if (runtime->sleep_min)
2060 snd_pcm_tick_prepare(substream);
2062 snd_pcm_stream_unlock_irqrestore(substream, flags);
2066 * snd_pcm_period_elapsed - update the pcm status for the next period
2067 * @substream: the pcm substream instance
2069 * This function is called from the interrupt handler when the
2070 * PCM has processed the period size. It will update the current
2071 * pointer, set up the tick, wake up sleepers, etc.
2073 * Even if more than one periods have elapsed since the last call, you
2074 * have to call this only once.
2076 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
2078 struct snd_pcm_runtime *runtime;
2079 unsigned long flags;
2081 snd_assert(substream != NULL, return);
2082 runtime = substream->runtime;
2083 snd_assert(runtime != NULL, return);
2085 if (runtime->transfer_ack_begin)
2086 runtime->transfer_ack_begin(substream);
2088 snd_pcm_stream_lock_irqsave(substream, flags);
2089 if (!snd_pcm_running(substream) ||
2090 snd_pcm_update_hw_ptr_interrupt(substream) < 0)
2093 if (substream->timer_running)
2094 snd_timer_interrupt(substream->timer, 1);
2095 if (runtime->sleep_min)
2096 snd_pcm_tick_prepare(substream);
2098 snd_pcm_stream_unlock_irqrestore(substream, flags);
2099 if (runtime->transfer_ack_end)
2100 runtime->transfer_ack_end(substream);
2101 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
2104 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
2106 unsigned long data, unsigned int off,
2107 snd_pcm_uframes_t frames)
2109 struct snd_pcm_runtime *runtime = substream->runtime;
2111 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2112 if (substream->ops->copy) {
2113 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2116 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2117 snd_assert(runtime->dma_area, return -EFAULT);
2118 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
2124 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
2125 unsigned long data, unsigned int off,
2126 snd_pcm_uframes_t size);
2128 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
2130 snd_pcm_uframes_t size,
2132 transfer_f transfer)
2134 struct snd_pcm_runtime *runtime = substream->runtime;
2135 snd_pcm_uframes_t xfer = 0;
2136 snd_pcm_uframes_t offset = 0;
2141 if (size > runtime->xfer_align)
2142 size -= size % runtime->xfer_align;
2144 snd_pcm_stream_lock_irq(substream);
2145 switch (runtime->status->state) {
2146 case SNDRV_PCM_STATE_PREPARED:
2147 case SNDRV_PCM_STATE_RUNNING:
2148 case SNDRV_PCM_STATE_PAUSED:
2150 case SNDRV_PCM_STATE_XRUN:
2153 case SNDRV_PCM_STATE_SUSPENDED:
2162 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2163 snd_pcm_uframes_t avail;
2164 snd_pcm_uframes_t cont;
2165 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2166 snd_pcm_update_hw_ptr(substream);
2167 avail = snd_pcm_playback_avail(runtime);
2168 if (((avail < runtime->control->avail_min && size > avail) ||
2169 (size >= runtime->xfer_align && avail < runtime->xfer_align))) {
2171 enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
2179 init_waitqueue_entry(&wait, current);
2180 add_wait_queue(&runtime->sleep, &wait);
2182 if (signal_pending(current)) {
2186 set_current_state(TASK_INTERRUPTIBLE);
2187 snd_pcm_stream_unlock_irq(substream);
2188 tout = schedule_timeout(10 * HZ);
2189 snd_pcm_stream_lock_irq(substream);
2191 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2192 runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2193 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2197 switch (runtime->status->state) {
2198 case SNDRV_PCM_STATE_XRUN:
2199 case SNDRV_PCM_STATE_DRAINING:
2202 case SNDRV_PCM_STATE_SUSPENDED:
2205 case SNDRV_PCM_STATE_SETUP:
2211 avail = snd_pcm_playback_avail(runtime);
2212 if (avail >= runtime->control->avail_min) {
2218 remove_wait_queue(&runtime->sleep, &wait);
2231 snd_printd("playback write error (DMA or IRQ trouble?)\n");
2241 if (avail > runtime->xfer_align)
2242 avail -= avail % runtime->xfer_align;
2243 frames = size > avail ? avail : size;
2244 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2247 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2248 appl_ptr = runtime->control->appl_ptr;
2249 appl_ofs = appl_ptr % runtime->buffer_size;
2250 snd_pcm_stream_unlock_irq(substream);
2251 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2253 snd_pcm_stream_lock_irq(substream);
2254 switch (runtime->status->state) {
2255 case SNDRV_PCM_STATE_XRUN:
2258 case SNDRV_PCM_STATE_SUSPENDED:
2265 if (appl_ptr >= runtime->boundary)
2266 appl_ptr -= runtime->boundary;
2267 runtime->control->appl_ptr = appl_ptr;
2268 if (substream->ops->ack)
2269 substream->ops->ack(substream);
2274 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2275 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2276 err = snd_pcm_start(substream);
2280 if (runtime->sleep_min &&
2281 runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2282 snd_pcm_tick_prepare(substream);
2285 snd_pcm_stream_unlock_irq(substream);
2287 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2290 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2292 struct snd_pcm_runtime *runtime;
2295 snd_assert(substream != NULL, return -ENXIO);
2296 runtime = substream->runtime;
2297 snd_assert(runtime != NULL, return -ENXIO);
2298 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2299 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2302 snd_assert(substream->ffile != NULL, return -ENXIO);
2303 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2304 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2305 if (substream->oss.oss) {
2306 struct snd_pcm_oss_setup *setup = substream->oss.setup;
2307 if (setup != NULL) {
2308 if (setup->nonblock)
2310 else if (setup->block)
2316 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2317 runtime->channels > 1)
2319 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2320 snd_pcm_lib_write_transfer);
2323 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
2325 unsigned long data, unsigned int off,
2326 snd_pcm_uframes_t frames)
2328 struct snd_pcm_runtime *runtime = substream->runtime;
2330 void __user **bufs = (void __user **)data;
2331 int channels = runtime->channels;
2333 if (substream->ops->copy) {
2334 snd_assert(substream->ops->silence != NULL, return -EINVAL);
2335 for (c = 0; c < channels; ++c, ++bufs) {
2336 if (*bufs == NULL) {
2337 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2340 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2341 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2346 /* default transfer behaviour */
2347 size_t dma_csize = runtime->dma_bytes / channels;
2348 snd_assert(runtime->dma_area, return -EFAULT);
2349 for (c = 0; c < channels; ++c, ++bufs) {
2350 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2351 if (*bufs == NULL) {
2352 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2354 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2355 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2363 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2365 snd_pcm_uframes_t frames)
2367 struct snd_pcm_runtime *runtime;
2370 snd_assert(substream != NULL, return -ENXIO);
2371 runtime = substream->runtime;
2372 snd_assert(runtime != NULL, return -ENXIO);
2373 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2374 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2377 snd_assert(substream->ffile != NULL, return -ENXIO);
2378 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2379 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2380 if (substream->oss.oss) {
2381 struct snd_pcm_oss_setup *setup = substream->oss.setup;
2382 if (setup != NULL) {
2383 if (setup->nonblock)
2385 else if (setup->block)
2391 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2393 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2394 nonblock, snd_pcm_lib_writev_transfer);
2397 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2399 unsigned long data, unsigned int off,
2400 snd_pcm_uframes_t frames)
2402 struct snd_pcm_runtime *runtime = substream->runtime;
2404 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2405 if (substream->ops->copy) {
2406 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2409 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2410 snd_assert(runtime->dma_area, return -EFAULT);
2411 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2417 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2419 snd_pcm_uframes_t size,
2421 transfer_f transfer)
2423 struct snd_pcm_runtime *runtime = substream->runtime;
2424 snd_pcm_uframes_t xfer = 0;
2425 snd_pcm_uframes_t offset = 0;
2430 if (size > runtime->xfer_align)
2431 size -= size % runtime->xfer_align;
2433 snd_pcm_stream_lock_irq(substream);
2434 switch (runtime->status->state) {
2435 case SNDRV_PCM_STATE_PREPARED:
2436 if (size >= runtime->start_threshold) {
2437 err = snd_pcm_start(substream);
2442 case SNDRV_PCM_STATE_DRAINING:
2443 case SNDRV_PCM_STATE_RUNNING:
2444 case SNDRV_PCM_STATE_PAUSED:
2446 case SNDRV_PCM_STATE_XRUN:
2449 case SNDRV_PCM_STATE_SUSPENDED:
2458 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2459 snd_pcm_uframes_t avail;
2460 snd_pcm_uframes_t cont;
2461 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2462 snd_pcm_update_hw_ptr(substream);
2464 avail = snd_pcm_capture_avail(runtime);
2465 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2466 if (avail < runtime->xfer_align) {
2470 } else if ((avail < runtime->control->avail_min && size > avail) ||
2471 (size >= runtime->xfer_align && avail < runtime->xfer_align)) {
2473 enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
2481 init_waitqueue_entry(&wait, current);
2482 add_wait_queue(&runtime->sleep, &wait);
2484 if (signal_pending(current)) {
2488 set_current_state(TASK_INTERRUPTIBLE);
2489 snd_pcm_stream_unlock_irq(substream);
2490 tout = schedule_timeout(10 * HZ);
2491 snd_pcm_stream_lock_irq(substream);
2493 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2494 runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2495 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2499 switch (runtime->status->state) {
2500 case SNDRV_PCM_STATE_XRUN:
2503 case SNDRV_PCM_STATE_SUSPENDED:
2506 case SNDRV_PCM_STATE_DRAINING:
2508 case SNDRV_PCM_STATE_SETUP:
2514 avail = snd_pcm_capture_avail(runtime);
2515 if (avail >= runtime->control->avail_min) {
2521 remove_wait_queue(&runtime->sleep, &wait);
2534 snd_printd("capture read error (DMA or IRQ trouble?)\n");
2544 if (avail > runtime->xfer_align)
2545 avail -= avail % runtime->xfer_align;
2546 frames = size > avail ? avail : size;
2547 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2550 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2551 appl_ptr = runtime->control->appl_ptr;
2552 appl_ofs = appl_ptr % runtime->buffer_size;
2553 snd_pcm_stream_unlock_irq(substream);
2554 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2556 snd_pcm_stream_lock_irq(substream);
2557 switch (runtime->status->state) {
2558 case SNDRV_PCM_STATE_XRUN:
2561 case SNDRV_PCM_STATE_SUSPENDED:
2568 if (appl_ptr >= runtime->boundary)
2569 appl_ptr -= runtime->boundary;
2570 runtime->control->appl_ptr = appl_ptr;
2571 if (substream->ops->ack)
2572 substream->ops->ack(substream);
2577 if (runtime->sleep_min &&
2578 runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2579 snd_pcm_tick_prepare(substream);
2582 snd_pcm_stream_unlock_irq(substream);
2584 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2587 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2589 struct snd_pcm_runtime *runtime;
2592 snd_assert(substream != NULL, return -ENXIO);
2593 runtime = substream->runtime;
2594 snd_assert(runtime != NULL, return -ENXIO);
2595 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2596 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2599 snd_assert(substream->ffile != NULL, return -ENXIO);
2600 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2601 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2602 if (substream->oss.oss) {
2603 struct snd_pcm_oss_setup *setup = substream->oss.setup;
2604 if (setup != NULL) {
2605 if (setup->nonblock)
2607 else if (setup->block)
2612 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2614 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2617 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2619 unsigned long data, unsigned int off,
2620 snd_pcm_uframes_t frames)
2622 struct snd_pcm_runtime *runtime = substream->runtime;
2624 void __user **bufs = (void __user **)data;
2625 int channels = runtime->channels;
2627 if (substream->ops->copy) {
2628 for (c = 0; c < channels; ++c, ++bufs) {
2632 buf = *bufs + samples_to_bytes(runtime, off);
2633 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2637 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2638 snd_assert(runtime->dma_area, return -EFAULT);
2639 for (c = 0; c < channels; ++c, ++bufs) {
2645 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2646 buf = *bufs + samples_to_bytes(runtime, off);
2647 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2654 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2656 snd_pcm_uframes_t frames)
2658 struct snd_pcm_runtime *runtime;
2661 snd_assert(substream != NULL, return -ENXIO);
2662 runtime = substream->runtime;
2663 snd_assert(runtime != NULL, return -ENXIO);
2664 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2665 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2668 snd_assert(substream->ffile != NULL, return -ENXIO);
2669 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2670 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2671 if (substream->oss.oss) {
2672 struct snd_pcm_oss_setup *setup = substream->oss.setup;
2673 if (setup != NULL) {
2674 if (setup->nonblock)
2676 else if (setup->block)
2682 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2684 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2691 EXPORT_SYMBOL(snd_interval_refine);
2692 EXPORT_SYMBOL(snd_interval_list);
2693 EXPORT_SYMBOL(snd_interval_ratnum);
2694 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
2695 EXPORT_SYMBOL(_snd_pcm_hw_param_min);
2696 EXPORT_SYMBOL(_snd_pcm_hw_param_set);
2697 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
2698 EXPORT_SYMBOL(_snd_pcm_hw_param_setinteger);
2699 EXPORT_SYMBOL(snd_pcm_hw_param_value_min);
2700 EXPORT_SYMBOL(snd_pcm_hw_param_value_max);
2701 EXPORT_SYMBOL(snd_pcm_hw_param_mask);
2702 EXPORT_SYMBOL(snd_pcm_hw_param_first);
2703 EXPORT_SYMBOL(snd_pcm_hw_param_last);
2704 EXPORT_SYMBOL(snd_pcm_hw_param_near);
2705 EXPORT_SYMBOL(snd_pcm_hw_param_set);
2706 EXPORT_SYMBOL(snd_pcm_hw_refine);
2707 EXPORT_SYMBOL(snd_pcm_hw_constraints_init);
2708 EXPORT_SYMBOL(snd_pcm_hw_constraints_complete);
2709 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
2710 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
2711 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
2712 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
2713 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
2714 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
2715 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
2716 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
2717 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
2718 EXPORT_SYMBOL(snd_pcm_set_ops);
2719 EXPORT_SYMBOL(snd_pcm_set_sync);
2720 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
2721 EXPORT_SYMBOL(snd_pcm_stop);
2722 EXPORT_SYMBOL(snd_pcm_period_elapsed);
2723 EXPORT_SYMBOL(snd_pcm_lib_write);
2724 EXPORT_SYMBOL(snd_pcm_lib_read);
2725 EXPORT_SYMBOL(snd_pcm_lib_writev);
2726 EXPORT_SYMBOL(snd_pcm_lib_readv);
2727 EXPORT_SYMBOL(snd_pcm_lib_buffer_bytes);
2728 EXPORT_SYMBOL(snd_pcm_lib_period_bytes);
2730 EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
2731 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
2732 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
2733 EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
2734 EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
2735 EXPORT_SYMBOL(snd_pcm_lib_free_pages);