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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Digital Audio (PCM) abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 * Abramo Bagnara <abramo@alsa-project.org>
6 */
7
8#include <linux/slab.h>
9#include <linux/sched/signal.h>
10#include <linux/time.h>
11#include <linux/math64.h>
12#include <linux/export.h>
13#include <sound/core.h>
14#include <sound/control.h>
15#include <sound/tlv.h>
16#include <sound/info.h>
17#include <sound/pcm.h>
18#include <sound/pcm_params.h>
19#include <sound/timer.h>
20
21#include "pcm_local.h"
22
23#ifdef CONFIG_SND_PCM_XRUN_DEBUG
24#define CREATE_TRACE_POINTS
25#include "pcm_trace.h"
26#else
27#define trace_hwptr(substream, pos, in_interrupt)
28#define trace_xrun(substream)
29#define trace_hw_ptr_error(substream, reason)
30#define trace_applptr(substream, prev, curr)
31#endif
32
33static int fill_silence_frames(struct snd_pcm_substream *substream,
34 snd_pcm_uframes_t off, snd_pcm_uframes_t frames);
35
36/*
37 * fill ring buffer with silence
38 * runtime->silence_start: starting pointer to silence area
39 * runtime->silence_filled: size filled with silence
40 * runtime->silence_threshold: threshold from application
41 * runtime->silence_size: maximal size from application
42 *
43 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
44 */
45void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
46{
47 struct snd_pcm_runtime *runtime = substream->runtime;
48 snd_pcm_uframes_t frames, ofs, transfer;
49 int err;
50
51 if (runtime->silence_size < runtime->boundary) {
52 snd_pcm_sframes_t noise_dist, n;
53 snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr);
54 if (runtime->silence_start != appl_ptr) {
55 n = appl_ptr - runtime->silence_start;
56 if (n < 0)
57 n += runtime->boundary;
58 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
59 runtime->silence_filled -= n;
60 else
61 runtime->silence_filled = 0;
62 runtime->silence_start = appl_ptr;
63 }
64 if (runtime->silence_filled >= runtime->buffer_size)
65 return;
66 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
67 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
68 return;
69 frames = runtime->silence_threshold - noise_dist;
70 if (frames > runtime->silence_size)
71 frames = runtime->silence_size;
72 } else {
73 if (new_hw_ptr == ULONG_MAX) { /* initialization */
74 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
75 if (avail > runtime->buffer_size)
76 avail = runtime->buffer_size;
77 runtime->silence_filled = avail > 0 ? avail : 0;
78 runtime->silence_start = (runtime->status->hw_ptr +
79 runtime->silence_filled) %
80 runtime->boundary;
81 } else {
82 ofs = runtime->status->hw_ptr;
83 frames = new_hw_ptr - ofs;
84 if ((snd_pcm_sframes_t)frames < 0)
85 frames += runtime->boundary;
86 runtime->silence_filled -= frames;
87 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
88 runtime->silence_filled = 0;
89 runtime->silence_start = new_hw_ptr;
90 } else {
91 runtime->silence_start = ofs;
92 }
93 }
94 frames = runtime->buffer_size - runtime->silence_filled;
95 }
96 if (snd_BUG_ON(frames > runtime->buffer_size))
97 return;
98 if (frames == 0)
99 return;
100 ofs = runtime->silence_start % runtime->buffer_size;
101 while (frames > 0) {
102 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
103 err = fill_silence_frames(substream, ofs, transfer);
104 snd_BUG_ON(err < 0);
105 runtime->silence_filled += transfer;
106 frames -= transfer;
107 ofs = 0;
108 }
109}
110
111#ifdef CONFIG_SND_DEBUG
112void snd_pcm_debug_name(struct snd_pcm_substream *substream,
113 char *name, size_t len)
114{
115 snprintf(name, len, "pcmC%dD%d%c:%d",
116 substream->pcm->card->number,
117 substream->pcm->device,
118 substream->stream ? 'c' : 'p',
119 substream->number);
120}
121EXPORT_SYMBOL(snd_pcm_debug_name);
122#endif
123
124#define XRUN_DEBUG_BASIC (1<<0)
125#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
126#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
127
128#ifdef CONFIG_SND_PCM_XRUN_DEBUG
129
130#define xrun_debug(substream, mask) \
131 ((substream)->pstr->xrun_debug & (mask))
132#else
133#define xrun_debug(substream, mask) 0
134#endif
135
136#define dump_stack_on_xrun(substream) do { \
137 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
138 dump_stack(); \
139 } while (0)
140
141/* call with stream lock held */
142void __snd_pcm_xrun(struct snd_pcm_substream *substream)
143{
144 struct snd_pcm_runtime *runtime = substream->runtime;
145
146 trace_xrun(substream);
147 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
148 struct timespec64 tstamp;
149
150 snd_pcm_gettime(runtime, &tstamp);
151 runtime->status->tstamp.tv_sec = tstamp.tv_sec;
152 runtime->status->tstamp.tv_nsec = tstamp.tv_nsec;
153 }
154 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
155 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
156 char name[16];
157 snd_pcm_debug_name(substream, name, sizeof(name));
158 pcm_warn(substream->pcm, "XRUN: %s\n", name);
159 dump_stack_on_xrun(substream);
160 }
161}
162
163#ifdef CONFIG_SND_PCM_XRUN_DEBUG
164#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
165 do { \
166 trace_hw_ptr_error(substream, reason); \
167 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
168 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
169 (in_interrupt) ? 'Q' : 'P', ##args); \
170 dump_stack_on_xrun(substream); \
171 } \
172 } while (0)
173
174#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
175
176#define hw_ptr_error(substream, fmt, args...) do { } while (0)
177
178#endif
179
180int snd_pcm_update_state(struct snd_pcm_substream *substream,
181 struct snd_pcm_runtime *runtime)
182{
183 snd_pcm_uframes_t avail;
184
185 avail = snd_pcm_avail(substream);
186 if (avail > runtime->avail_max)
187 runtime->avail_max = avail;
188 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
189 if (avail >= runtime->buffer_size) {
190 snd_pcm_drain_done(substream);
191 return -EPIPE;
192 }
193 } else {
194 if (avail >= runtime->stop_threshold) {
195 __snd_pcm_xrun(substream);
196 return -EPIPE;
197 }
198 }
199 if (runtime->twake) {
200 if (avail >= runtime->twake)
201 wake_up(&runtime->tsleep);
202 } else if (avail >= runtime->control->avail_min)
203 wake_up(&runtime->sleep);
204 return 0;
205}
206
207static void update_audio_tstamp(struct snd_pcm_substream *substream,
208 struct timespec64 *curr_tstamp,
209 struct timespec64 *audio_tstamp)
210{
211 struct snd_pcm_runtime *runtime = substream->runtime;
212 u64 audio_frames, audio_nsecs;
213 struct timespec64 driver_tstamp;
214
215 if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
216 return;
217
218 if (!(substream->ops->get_time_info) ||
219 (runtime->audio_tstamp_report.actual_type ==
220 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
221
222 /*
223 * provide audio timestamp derived from pointer position
224 * add delay only if requested
225 */
226
227 audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
228
229 if (runtime->audio_tstamp_config.report_delay) {
230 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
231 audio_frames -= runtime->delay;
232 else
233 audio_frames += runtime->delay;
234 }
235 audio_nsecs = div_u64(audio_frames * 1000000000LL,
236 runtime->rate);
237 *audio_tstamp = ns_to_timespec64(audio_nsecs);
238 }
239
240 if (runtime->status->audio_tstamp.tv_sec != audio_tstamp->tv_sec ||
241 runtime->status->audio_tstamp.tv_nsec != audio_tstamp->tv_nsec) {
242 runtime->status->audio_tstamp.tv_sec = audio_tstamp->tv_sec;
243 runtime->status->audio_tstamp.tv_nsec = audio_tstamp->tv_nsec;
244 runtime->status->tstamp.tv_sec = curr_tstamp->tv_sec;
245 runtime->status->tstamp.tv_nsec = curr_tstamp->tv_nsec;
246 }
247
248
249 /*
250 * re-take a driver timestamp to let apps detect if the reference tstamp
251 * read by low-level hardware was provided with a delay
252 */
253 snd_pcm_gettime(substream->runtime, &driver_tstamp);
254 runtime->driver_tstamp = driver_tstamp;
255}
256
257static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
258 unsigned int in_interrupt)
259{
260 struct snd_pcm_runtime *runtime = substream->runtime;
261 snd_pcm_uframes_t pos;
262 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
263 snd_pcm_sframes_t hdelta, delta;
264 unsigned long jdelta;
265 unsigned long curr_jiffies;
266 struct timespec64 curr_tstamp;
267 struct timespec64 audio_tstamp;
268 int crossed_boundary = 0;
269
270 old_hw_ptr = runtime->status->hw_ptr;
271
272 /*
273 * group pointer, time and jiffies reads to allow for more
274 * accurate correlations/corrections.
275 * The values are stored at the end of this routine after
276 * corrections for hw_ptr position
277 */
278 pos = substream->ops->pointer(substream);
279 curr_jiffies = jiffies;
280 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
281 if ((substream->ops->get_time_info) &&
282 (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
283 substream->ops->get_time_info(substream, &curr_tstamp,
284 &audio_tstamp,
285 &runtime->audio_tstamp_config,
286 &runtime->audio_tstamp_report);
287
288 /* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */
289 if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
290 snd_pcm_gettime(runtime, &curr_tstamp);
291 } else
292 snd_pcm_gettime(runtime, &curr_tstamp);
293 }
294
295 if (pos == SNDRV_PCM_POS_XRUN) {
296 __snd_pcm_xrun(substream);
297 return -EPIPE;
298 }
299 if (pos >= runtime->buffer_size) {
300 if (printk_ratelimit()) {
301 char name[16];
302 snd_pcm_debug_name(substream, name, sizeof(name));
303 pcm_err(substream->pcm,
304 "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
305 name, pos, runtime->buffer_size,
306 runtime->period_size);
307 }
308 pos = 0;
309 }
310 pos -= pos % runtime->min_align;
311 trace_hwptr(substream, pos, in_interrupt);
312 hw_base = runtime->hw_ptr_base;
313 new_hw_ptr = hw_base + pos;
314 if (in_interrupt) {
315 /* we know that one period was processed */
316 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
317 delta = runtime->hw_ptr_interrupt + runtime->period_size;
318 if (delta > new_hw_ptr) {
319 /* check for double acknowledged interrupts */
320 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
321 if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
322 hw_base += runtime->buffer_size;
323 if (hw_base >= runtime->boundary) {
324 hw_base = 0;
325 crossed_boundary++;
326 }
327 new_hw_ptr = hw_base + pos;
328 goto __delta;
329 }
330 }
331 }
332 /* new_hw_ptr might be lower than old_hw_ptr in case when */
333 /* pointer crosses the end of the ring buffer */
334 if (new_hw_ptr < old_hw_ptr) {
335 hw_base += runtime->buffer_size;
336 if (hw_base >= runtime->boundary) {
337 hw_base = 0;
338 crossed_boundary++;
339 }
340 new_hw_ptr = hw_base + pos;
341 }
342 __delta:
343 delta = new_hw_ptr - old_hw_ptr;
344 if (delta < 0)
345 delta += runtime->boundary;
346
347 if (runtime->no_period_wakeup) {
348 snd_pcm_sframes_t xrun_threshold;
349 /*
350 * Without regular period interrupts, we have to check
351 * the elapsed time to detect xruns.
352 */
353 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
354 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
355 goto no_delta_check;
356 hdelta = jdelta - delta * HZ / runtime->rate;
357 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
358 while (hdelta > xrun_threshold) {
359 delta += runtime->buffer_size;
360 hw_base += runtime->buffer_size;
361 if (hw_base >= runtime->boundary) {
362 hw_base = 0;
363 crossed_boundary++;
364 }
365 new_hw_ptr = hw_base + pos;
366 hdelta -= runtime->hw_ptr_buffer_jiffies;
367 }
368 goto no_delta_check;
369 }
370
371 /* something must be really wrong */
372 if (delta >= runtime->buffer_size + runtime->period_size) {
373 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
374 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
375 substream->stream, (long)pos,
376 (long)new_hw_ptr, (long)old_hw_ptr);
377 return 0;
378 }
379
380 /* Do jiffies check only in xrun_debug mode */
381 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
382 goto no_jiffies_check;
383
384 /* Skip the jiffies check for hardwares with BATCH flag.
385 * Such hardware usually just increases the position at each IRQ,
386 * thus it can't give any strange position.
387 */
388 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
389 goto no_jiffies_check;
390 hdelta = delta;
391 if (hdelta < runtime->delay)
392 goto no_jiffies_check;
393 hdelta -= runtime->delay;
394 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
395 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
396 delta = jdelta /
397 (((runtime->period_size * HZ) / runtime->rate)
398 + HZ/100);
399 /* move new_hw_ptr according jiffies not pos variable */
400 new_hw_ptr = old_hw_ptr;
401 hw_base = delta;
402 /* use loop to avoid checks for delta overflows */
403 /* the delta value is small or zero in most cases */
404 while (delta > 0) {
405 new_hw_ptr += runtime->period_size;
406 if (new_hw_ptr >= runtime->boundary) {
407 new_hw_ptr -= runtime->boundary;
408 crossed_boundary--;
409 }
410 delta--;
411 }
412 /* align hw_base to buffer_size */
413 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
414 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
415 (long)pos, (long)hdelta,
416 (long)runtime->period_size, jdelta,
417 ((hdelta * HZ) / runtime->rate), hw_base,
418 (unsigned long)old_hw_ptr,
419 (unsigned long)new_hw_ptr);
420 /* reset values to proper state */
421 delta = 0;
422 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
423 }
424 no_jiffies_check:
425 if (delta > runtime->period_size + runtime->period_size / 2) {
426 hw_ptr_error(substream, in_interrupt,
427 "Lost interrupts?",
428 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
429 substream->stream, (long)delta,
430 (long)new_hw_ptr,
431 (long)old_hw_ptr);
432 }
433
434 no_delta_check:
435 if (runtime->status->hw_ptr == new_hw_ptr) {
436 runtime->hw_ptr_jiffies = curr_jiffies;
437 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
438 return 0;
439 }
440
441 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
442 runtime->silence_size > 0)
443 snd_pcm_playback_silence(substream, new_hw_ptr);
444
445 if (in_interrupt) {
446 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
447 if (delta < 0)
448 delta += runtime->boundary;
449 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
450 runtime->hw_ptr_interrupt += delta;
451 if (runtime->hw_ptr_interrupt >= runtime->boundary)
452 runtime->hw_ptr_interrupt -= runtime->boundary;
453 }
454 runtime->hw_ptr_base = hw_base;
455 runtime->status->hw_ptr = new_hw_ptr;
456 runtime->hw_ptr_jiffies = curr_jiffies;
457 if (crossed_boundary) {
458 snd_BUG_ON(crossed_boundary != 1);
459 runtime->hw_ptr_wrap += runtime->boundary;
460 }
461
462 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
463
464 return snd_pcm_update_state(substream, runtime);
465}
466
467/* CAUTION: call it with irq disabled */
468int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
469{
470 return snd_pcm_update_hw_ptr0(substream, 0);
471}
472
473/**
474 * snd_pcm_set_ops - set the PCM operators
475 * @pcm: the pcm instance
476 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
477 * @ops: the operator table
478 *
479 * Sets the given PCM operators to the pcm instance.
480 */
481void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
482 const struct snd_pcm_ops *ops)
483{
484 struct snd_pcm_str *stream = &pcm->streams[direction];
485 struct snd_pcm_substream *substream;
486
487 for (substream = stream->substream; substream != NULL; substream = substream->next)
488 substream->ops = ops;
489}
490EXPORT_SYMBOL(snd_pcm_set_ops);
491
492/**
493 * snd_pcm_sync - set the PCM sync id
494 * @substream: the pcm substream
495 *
496 * Sets the PCM sync identifier for the card.
497 */
498void snd_pcm_set_sync(struct snd_pcm_substream *substream)
499{
500 struct snd_pcm_runtime *runtime = substream->runtime;
501
502 runtime->sync.id32[0] = substream->pcm->card->number;
503 runtime->sync.id32[1] = -1;
504 runtime->sync.id32[2] = -1;
505 runtime->sync.id32[3] = -1;
506}
507EXPORT_SYMBOL(snd_pcm_set_sync);
508
509/*
510 * Standard ioctl routine
511 */
512
513static inline unsigned int div32(unsigned int a, unsigned int b,
514 unsigned int *r)
515{
516 if (b == 0) {
517 *r = 0;
518 return UINT_MAX;
519 }
520 *r = a % b;
521 return a / b;
522}
523
524static inline unsigned int div_down(unsigned int a, unsigned int b)
525{
526 if (b == 0)
527 return UINT_MAX;
528 return a / b;
529}
530
531static inline unsigned int div_up(unsigned int a, unsigned int b)
532{
533 unsigned int r;
534 unsigned int q;
535 if (b == 0)
536 return UINT_MAX;
537 q = div32(a, b, &r);
538 if (r)
539 ++q;
540 return q;
541}
542
543static inline unsigned int mul(unsigned int a, unsigned int b)
544{
545 if (a == 0)
546 return 0;
547 if (div_down(UINT_MAX, a) < b)
548 return UINT_MAX;
549 return a * b;
550}
551
552static inline unsigned int muldiv32(unsigned int a, unsigned int b,
553 unsigned int c, unsigned int *r)
554{
555 u_int64_t n = (u_int64_t) a * b;
556 if (c == 0) {
557 *r = 0;
558 return UINT_MAX;
559 }
560 n = div_u64_rem(n, c, r);
561 if (n >= UINT_MAX) {
562 *r = 0;
563 return UINT_MAX;
564 }
565 return n;
566}
567
568/**
569 * snd_interval_refine - refine the interval value of configurator
570 * @i: the interval value to refine
571 * @v: the interval value to refer to
572 *
573 * Refines the interval value with the reference value.
574 * The interval is changed to the range satisfying both intervals.
575 * The interval status (min, max, integer, etc.) are evaluated.
576 *
577 * Return: Positive if the value is changed, zero if it's not changed, or a
578 * negative error code.
579 */
580int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
581{
582 int changed = 0;
583 if (snd_BUG_ON(snd_interval_empty(i)))
584 return -EINVAL;
585 if (i->min < v->min) {
586 i->min = v->min;
587 i->openmin = v->openmin;
588 changed = 1;
589 } else if (i->min == v->min && !i->openmin && v->openmin) {
590 i->openmin = 1;
591 changed = 1;
592 }
593 if (i->max > v->max) {
594 i->max = v->max;
595 i->openmax = v->openmax;
596 changed = 1;
597 } else if (i->max == v->max && !i->openmax && v->openmax) {
598 i->openmax = 1;
599 changed = 1;
600 }
601 if (!i->integer && v->integer) {
602 i->integer = 1;
603 changed = 1;
604 }
605 if (i->integer) {
606 if (i->openmin) {
607 i->min++;
608 i->openmin = 0;
609 }
610 if (i->openmax) {
611 i->max--;
612 i->openmax = 0;
613 }
614 } else if (!i->openmin && !i->openmax && i->min == i->max)
615 i->integer = 1;
616 if (snd_interval_checkempty(i)) {
617 snd_interval_none(i);
618 return -EINVAL;
619 }
620 return changed;
621}
622EXPORT_SYMBOL(snd_interval_refine);
623
624static int snd_interval_refine_first(struct snd_interval *i)
625{
626 const unsigned int last_max = i->max;
627
628 if (snd_BUG_ON(snd_interval_empty(i)))
629 return -EINVAL;
630 if (snd_interval_single(i))
631 return 0;
632 i->max = i->min;
633 if (i->openmin)
634 i->max++;
635 /* only exclude max value if also excluded before refine */
636 i->openmax = (i->openmax && i->max >= last_max);
637 return 1;
638}
639
640static int snd_interval_refine_last(struct snd_interval *i)
641{
642 const unsigned int last_min = i->min;
643
644 if (snd_BUG_ON(snd_interval_empty(i)))
645 return -EINVAL;
646 if (snd_interval_single(i))
647 return 0;
648 i->min = i->max;
649 if (i->openmax)
650 i->min--;
651 /* only exclude min value if also excluded before refine */
652 i->openmin = (i->openmin && i->min <= last_min);
653 return 1;
654}
655
656void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
657{
658 if (a->empty || b->empty) {
659 snd_interval_none(c);
660 return;
661 }
662 c->empty = 0;
663 c->min = mul(a->min, b->min);
664 c->openmin = (a->openmin || b->openmin);
665 c->max = mul(a->max, b->max);
666 c->openmax = (a->openmax || b->openmax);
667 c->integer = (a->integer && b->integer);
668}
669
670/**
671 * snd_interval_div - refine the interval value with division
672 * @a: dividend
673 * @b: divisor
674 * @c: quotient
675 *
676 * c = a / b
677 *
678 * Returns non-zero if the value is changed, zero if not changed.
679 */
680void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
681{
682 unsigned int r;
683 if (a->empty || b->empty) {
684 snd_interval_none(c);
685 return;
686 }
687 c->empty = 0;
688 c->min = div32(a->min, b->max, &r);
689 c->openmin = (r || a->openmin || b->openmax);
690 if (b->min > 0) {
691 c->max = div32(a->max, b->min, &r);
692 if (r) {
693 c->max++;
694 c->openmax = 1;
695 } else
696 c->openmax = (a->openmax || b->openmin);
697 } else {
698 c->max = UINT_MAX;
699 c->openmax = 0;
700 }
701 c->integer = 0;
702}
703
704/**
705 * snd_interval_muldivk - refine the interval value
706 * @a: dividend 1
707 * @b: dividend 2
708 * @k: divisor (as integer)
709 * @c: result
710 *
711 * c = a * b / k
712 *
713 * Returns non-zero if the value is changed, zero if not changed.
714 */
715void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
716 unsigned int k, struct snd_interval *c)
717{
718 unsigned int r;
719 if (a->empty || b->empty) {
720 snd_interval_none(c);
721 return;
722 }
723 c->empty = 0;
724 c->min = muldiv32(a->min, b->min, k, &r);
725 c->openmin = (r || a->openmin || b->openmin);
726 c->max = muldiv32(a->max, b->max, k, &r);
727 if (r) {
728 c->max++;
729 c->openmax = 1;
730 } else
731 c->openmax = (a->openmax || b->openmax);
732 c->integer = 0;
733}
734
735/**
736 * snd_interval_mulkdiv - refine the interval value
737 * @a: dividend 1
738 * @k: dividend 2 (as integer)
739 * @b: divisor
740 * @c: result
741 *
742 * c = a * k / b
743 *
744 * Returns non-zero if the value is changed, zero if not changed.
745 */
746void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
747 const struct snd_interval *b, struct snd_interval *c)
748{
749 unsigned int r;
750 if (a->empty || b->empty) {
751 snd_interval_none(c);
752 return;
753 }
754 c->empty = 0;
755 c->min = muldiv32(a->min, k, b->max, &r);
756 c->openmin = (r || a->openmin || b->openmax);
757 if (b->min > 0) {
758 c->max = muldiv32(a->max, k, b->min, &r);
759 if (r) {
760 c->max++;
761 c->openmax = 1;
762 } else
763 c->openmax = (a->openmax || b->openmin);
764 } else {
765 c->max = UINT_MAX;
766 c->openmax = 0;
767 }
768 c->integer = 0;
769}
770
771/* ---- */
772
773
774/**
775 * snd_interval_ratnum - refine the interval value
776 * @i: interval to refine
777 * @rats_count: number of ratnum_t
778 * @rats: ratnum_t array
779 * @nump: pointer to store the resultant numerator
780 * @denp: pointer to store the resultant denominator
781 *
782 * Return: Positive if the value is changed, zero if it's not changed, or a
783 * negative error code.
784 */
785int snd_interval_ratnum(struct snd_interval *i,
786 unsigned int rats_count, const struct snd_ratnum *rats,
787 unsigned int *nump, unsigned int *denp)
788{
789 unsigned int best_num, best_den;
790 int best_diff;
791 unsigned int k;
792 struct snd_interval t;
793 int err;
794 unsigned int result_num, result_den;
795 int result_diff;
796
797 best_num = best_den = best_diff = 0;
798 for (k = 0; k < rats_count; ++k) {
799 unsigned int num = rats[k].num;
800 unsigned int den;
801 unsigned int q = i->min;
802 int diff;
803 if (q == 0)
804 q = 1;
805 den = div_up(num, q);
806 if (den < rats[k].den_min)
807 continue;
808 if (den > rats[k].den_max)
809 den = rats[k].den_max;
810 else {
811 unsigned int r;
812 r = (den - rats[k].den_min) % rats[k].den_step;
813 if (r != 0)
814 den -= r;
815 }
816 diff = num - q * den;
817 if (diff < 0)
818 diff = -diff;
819 if (best_num == 0 ||
820 diff * best_den < best_diff * den) {
821 best_diff = diff;
822 best_den = den;
823 best_num = num;
824 }
825 }
826 if (best_den == 0) {
827 i->empty = 1;
828 return -EINVAL;
829 }
830 t.min = div_down(best_num, best_den);
831 t.openmin = !!(best_num % best_den);
832
833 result_num = best_num;
834 result_diff = best_diff;
835 result_den = best_den;
836 best_num = best_den = best_diff = 0;
837 for (k = 0; k < rats_count; ++k) {
838 unsigned int num = rats[k].num;
839 unsigned int den;
840 unsigned int q = i->max;
841 int diff;
842 if (q == 0) {
843 i->empty = 1;
844 return -EINVAL;
845 }
846 den = div_down(num, q);
847 if (den > rats[k].den_max)
848 continue;
849 if (den < rats[k].den_min)
850 den = rats[k].den_min;
851 else {
852 unsigned int r;
853 r = (den - rats[k].den_min) % rats[k].den_step;
854 if (r != 0)
855 den += rats[k].den_step - r;
856 }
857 diff = q * den - num;
858 if (diff < 0)
859 diff = -diff;
860 if (best_num == 0 ||
861 diff * best_den < best_diff * den) {
862 best_diff = diff;
863 best_den = den;
864 best_num = num;
865 }
866 }
867 if (best_den == 0) {
868 i->empty = 1;
869 return -EINVAL;
870 }
871 t.max = div_up(best_num, best_den);
872 t.openmax = !!(best_num % best_den);
873 t.integer = 0;
874 err = snd_interval_refine(i, &t);
875 if (err < 0)
876 return err;
877
878 if (snd_interval_single(i)) {
879 if (best_diff * result_den < result_diff * best_den) {
880 result_num = best_num;
881 result_den = best_den;
882 }
883 if (nump)
884 *nump = result_num;
885 if (denp)
886 *denp = result_den;
887 }
888 return err;
889}
890EXPORT_SYMBOL(snd_interval_ratnum);
891
892/**
893 * snd_interval_ratden - refine the interval value
894 * @i: interval to refine
895 * @rats_count: number of struct ratden
896 * @rats: struct ratden array
897 * @nump: pointer to store the resultant numerator
898 * @denp: pointer to store the resultant denominator
899 *
900 * Return: Positive if the value is changed, zero if it's not changed, or a
901 * negative error code.
902 */
903static int snd_interval_ratden(struct snd_interval *i,
904 unsigned int rats_count,
905 const struct snd_ratden *rats,
906 unsigned int *nump, unsigned int *denp)
907{
908 unsigned int best_num, best_diff, best_den;
909 unsigned int k;
910 struct snd_interval t;
911 int err;
912
913 best_num = best_den = best_diff = 0;
914 for (k = 0; k < rats_count; ++k) {
915 unsigned int num;
916 unsigned int den = rats[k].den;
917 unsigned int q = i->min;
918 int diff;
919 num = mul(q, den);
920 if (num > rats[k].num_max)
921 continue;
922 if (num < rats[k].num_min)
923 num = rats[k].num_max;
924 else {
925 unsigned int r;
926 r = (num - rats[k].num_min) % rats[k].num_step;
927 if (r != 0)
928 num += rats[k].num_step - r;
929 }
930 diff = num - q * den;
931 if (best_num == 0 ||
932 diff * best_den < best_diff * den) {
933 best_diff = diff;
934 best_den = den;
935 best_num = num;
936 }
937 }
938 if (best_den == 0) {
939 i->empty = 1;
940 return -EINVAL;
941 }
942 t.min = div_down(best_num, best_den);
943 t.openmin = !!(best_num % best_den);
944
945 best_num = best_den = best_diff = 0;
946 for (k = 0; k < rats_count; ++k) {
947 unsigned int num;
948 unsigned int den = rats[k].den;
949 unsigned int q = i->max;
950 int diff;
951 num = mul(q, den);
952 if (num < rats[k].num_min)
953 continue;
954 if (num > rats[k].num_max)
955 num = rats[k].num_max;
956 else {
957 unsigned int r;
958 r = (num - rats[k].num_min) % rats[k].num_step;
959 if (r != 0)
960 num -= r;
961 }
962 diff = q * den - num;
963 if (best_num == 0 ||
964 diff * best_den < best_diff * den) {
965 best_diff = diff;
966 best_den = den;
967 best_num = num;
968 }
969 }
970 if (best_den == 0) {
971 i->empty = 1;
972 return -EINVAL;
973 }
974 t.max = div_up(best_num, best_den);
975 t.openmax = !!(best_num % best_den);
976 t.integer = 0;
977 err = snd_interval_refine(i, &t);
978 if (err < 0)
979 return err;
980
981 if (snd_interval_single(i)) {
982 if (nump)
983 *nump = best_num;
984 if (denp)
985 *denp = best_den;
986 }
987 return err;
988}
989
990/**
991 * snd_interval_list - refine the interval value from the list
992 * @i: the interval value to refine
993 * @count: the number of elements in the list
994 * @list: the value list
995 * @mask: the bit-mask to evaluate
996 *
997 * Refines the interval value from the list.
998 * When mask is non-zero, only the elements corresponding to bit 1 are
999 * evaluated.
1000 *
1001 * Return: Positive if the value is changed, zero if it's not changed, or a
1002 * negative error code.
1003 */
1004int snd_interval_list(struct snd_interval *i, unsigned int count,
1005 const unsigned int *list, unsigned int mask)
1006{
1007 unsigned int k;
1008 struct snd_interval list_range;
1009
1010 if (!count) {
1011 i->empty = 1;
1012 return -EINVAL;
1013 }
1014 snd_interval_any(&list_range);
1015 list_range.min = UINT_MAX;
1016 list_range.max = 0;
1017 for (k = 0; k < count; k++) {
1018 if (mask && !(mask & (1 << k)))
1019 continue;
1020 if (!snd_interval_test(i, list[k]))
1021 continue;
1022 list_range.min = min(list_range.min, list[k]);
1023 list_range.max = max(list_range.max, list[k]);
1024 }
1025 return snd_interval_refine(i, &list_range);
1026}
1027EXPORT_SYMBOL(snd_interval_list);
1028
1029/**
1030 * snd_interval_ranges - refine the interval value from the list of ranges
1031 * @i: the interval value to refine
1032 * @count: the number of elements in the list of ranges
1033 * @ranges: the ranges list
1034 * @mask: the bit-mask to evaluate
1035 *
1036 * Refines the interval value from the list of ranges.
1037 * When mask is non-zero, only the elements corresponding to bit 1 are
1038 * evaluated.
1039 *
1040 * Return: Positive if the value is changed, zero if it's not changed, or a
1041 * negative error code.
1042 */
1043int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1044 const struct snd_interval *ranges, unsigned int mask)
1045{
1046 unsigned int k;
1047 struct snd_interval range_union;
1048 struct snd_interval range;
1049
1050 if (!count) {
1051 snd_interval_none(i);
1052 return -EINVAL;
1053 }
1054 snd_interval_any(&range_union);
1055 range_union.min = UINT_MAX;
1056 range_union.max = 0;
1057 for (k = 0; k < count; k++) {
1058 if (mask && !(mask & (1 << k)))
1059 continue;
1060 snd_interval_copy(&range, &ranges[k]);
1061 if (snd_interval_refine(&range, i) < 0)
1062 continue;
1063 if (snd_interval_empty(&range))
1064 continue;
1065
1066 if (range.min < range_union.min) {
1067 range_union.min = range.min;
1068 range_union.openmin = 1;
1069 }
1070 if (range.min == range_union.min && !range.openmin)
1071 range_union.openmin = 0;
1072 if (range.max > range_union.max) {
1073 range_union.max = range.max;
1074 range_union.openmax = 1;
1075 }
1076 if (range.max == range_union.max && !range.openmax)
1077 range_union.openmax = 0;
1078 }
1079 return snd_interval_refine(i, &range_union);
1080}
1081EXPORT_SYMBOL(snd_interval_ranges);
1082
1083static int snd_interval_step(struct snd_interval *i, unsigned int step)
1084{
1085 unsigned int n;
1086 int changed = 0;
1087 n = i->min % step;
1088 if (n != 0 || i->openmin) {
1089 i->min += step - n;
1090 i->openmin = 0;
1091 changed = 1;
1092 }
1093 n = i->max % step;
1094 if (n != 0 || i->openmax) {
1095 i->max -= n;
1096 i->openmax = 0;
1097 changed = 1;
1098 }
1099 if (snd_interval_checkempty(i)) {
1100 i->empty = 1;
1101 return -EINVAL;
1102 }
1103 return changed;
1104}
1105
1106/* Info constraints helpers */
1107
1108/**
1109 * snd_pcm_hw_rule_add - add the hw-constraint rule
1110 * @runtime: the pcm runtime instance
1111 * @cond: condition bits
1112 * @var: the variable to evaluate
1113 * @func: the evaluation function
1114 * @private: the private data pointer passed to function
1115 * @dep: the dependent variables
1116 *
1117 * Return: Zero if successful, or a negative error code on failure.
1118 */
1119int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1120 int var,
1121 snd_pcm_hw_rule_func_t func, void *private,
1122 int dep, ...)
1123{
1124 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1125 struct snd_pcm_hw_rule *c;
1126 unsigned int k;
1127 va_list args;
1128 va_start(args, dep);
1129 if (constrs->rules_num >= constrs->rules_all) {
1130 struct snd_pcm_hw_rule *new;
1131 unsigned int new_rules = constrs->rules_all + 16;
1132 new = krealloc(constrs->rules, new_rules * sizeof(*c),
1133 GFP_KERNEL);
1134 if (!new) {
1135 va_end(args);
1136 return -ENOMEM;
1137 }
1138 constrs->rules = new;
1139 constrs->rules_all = new_rules;
1140 }
1141 c = &constrs->rules[constrs->rules_num];
1142 c->cond = cond;
1143 c->func = func;
1144 c->var = var;
1145 c->private = private;
1146 k = 0;
1147 while (1) {
1148 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1149 va_end(args);
1150 return -EINVAL;
1151 }
1152 c->deps[k++] = dep;
1153 if (dep < 0)
1154 break;
1155 dep = va_arg(args, int);
1156 }
1157 constrs->rules_num++;
1158 va_end(args);
1159 return 0;
1160}
1161EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1162
1163/**
1164 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1165 * @runtime: PCM runtime instance
1166 * @var: hw_params variable to apply the mask
1167 * @mask: the bitmap mask
1168 *
1169 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1170 *
1171 * Return: Zero if successful, or a negative error code on failure.
1172 */
1173int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1174 u_int32_t mask)
1175{
1176 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1177 struct snd_mask *maskp = constrs_mask(constrs, var);
1178 *maskp->bits &= mask;
1179 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1180 if (*maskp->bits == 0)
1181 return -EINVAL;
1182 return 0;
1183}
1184
1185/**
1186 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1187 * @runtime: PCM runtime instance
1188 * @var: hw_params variable to apply the mask
1189 * @mask: the 64bit bitmap mask
1190 *
1191 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1192 *
1193 * Return: Zero if successful, or a negative error code on failure.
1194 */
1195int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1196 u_int64_t mask)
1197{
1198 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1199 struct snd_mask *maskp = constrs_mask(constrs, var);
1200 maskp->bits[0] &= (u_int32_t)mask;
1201 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1202 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1203 if (! maskp->bits[0] && ! maskp->bits[1])
1204 return -EINVAL;
1205 return 0;
1206}
1207EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1208
1209/**
1210 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1211 * @runtime: PCM runtime instance
1212 * @var: hw_params variable to apply the integer constraint
1213 *
1214 * Apply the constraint of integer to an interval parameter.
1215 *
1216 * Return: Positive if the value is changed, zero if it's not changed, or a
1217 * negative error code.
1218 */
1219int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1220{
1221 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1222 return snd_interval_setinteger(constrs_interval(constrs, var));
1223}
1224EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1225
1226/**
1227 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1228 * @runtime: PCM runtime instance
1229 * @var: hw_params variable to apply the range
1230 * @min: the minimal value
1231 * @max: the maximal value
1232 *
1233 * Apply the min/max range constraint to an interval parameter.
1234 *
1235 * Return: Positive if the value is changed, zero if it's not changed, or a
1236 * negative error code.
1237 */
1238int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1239 unsigned int min, unsigned int max)
1240{
1241 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1242 struct snd_interval t;
1243 t.min = min;
1244 t.max = max;
1245 t.openmin = t.openmax = 0;
1246 t.integer = 0;
1247 return snd_interval_refine(constrs_interval(constrs, var), &t);
1248}
1249EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1250
1251static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1252 struct snd_pcm_hw_rule *rule)
1253{
1254 struct snd_pcm_hw_constraint_list *list = rule->private;
1255 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1256}
1257
1258
1259/**
1260 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1261 * @runtime: PCM runtime instance
1262 * @cond: condition bits
1263 * @var: hw_params variable to apply the list constraint
1264 * @l: list
1265 *
1266 * Apply the list of constraints to an interval parameter.
1267 *
1268 * Return: Zero if successful, or a negative error code on failure.
1269 */
1270int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1271 unsigned int cond,
1272 snd_pcm_hw_param_t var,
1273 const struct snd_pcm_hw_constraint_list *l)
1274{
1275 return snd_pcm_hw_rule_add(runtime, cond, var,
1276 snd_pcm_hw_rule_list, (void *)l,
1277 var, -1);
1278}
1279EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1280
1281static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
1282 struct snd_pcm_hw_rule *rule)
1283{
1284 struct snd_pcm_hw_constraint_ranges *r = rule->private;
1285 return snd_interval_ranges(hw_param_interval(params, rule->var),
1286 r->count, r->ranges, r->mask);
1287}
1288
1289
1290/**
1291 * snd_pcm_hw_constraint_ranges - apply list of range constraints to a parameter
1292 * @runtime: PCM runtime instance
1293 * @cond: condition bits
1294 * @var: hw_params variable to apply the list of range constraints
1295 * @r: ranges
1296 *
1297 * Apply the list of range constraints to an interval parameter.
1298 *
1299 * Return: Zero if successful, or a negative error code on failure.
1300 */
1301int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1302 unsigned int cond,
1303 snd_pcm_hw_param_t var,
1304 const struct snd_pcm_hw_constraint_ranges *r)
1305{
1306 return snd_pcm_hw_rule_add(runtime, cond, var,
1307 snd_pcm_hw_rule_ranges, (void *)r,
1308 var, -1);
1309}
1310EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
1311
1312static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1313 struct snd_pcm_hw_rule *rule)
1314{
1315 const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1316 unsigned int num = 0, den = 0;
1317 int err;
1318 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1319 r->nrats, r->rats, &num, &den);
1320 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1321 params->rate_num = num;
1322 params->rate_den = den;
1323 }
1324 return err;
1325}
1326
1327/**
1328 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1329 * @runtime: PCM runtime instance
1330 * @cond: condition bits
1331 * @var: hw_params variable to apply the ratnums constraint
1332 * @r: struct snd_ratnums constriants
1333 *
1334 * Return: Zero if successful, or a negative error code on failure.
1335 */
1336int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1337 unsigned int cond,
1338 snd_pcm_hw_param_t var,
1339 const struct snd_pcm_hw_constraint_ratnums *r)
1340{
1341 return snd_pcm_hw_rule_add(runtime, cond, var,
1342 snd_pcm_hw_rule_ratnums, (void *)r,
1343 var, -1);
1344}
1345EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1346
1347static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1348 struct snd_pcm_hw_rule *rule)
1349{
1350 const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1351 unsigned int num = 0, den = 0;
1352 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1353 r->nrats, r->rats, &num, &den);
1354 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1355 params->rate_num = num;
1356 params->rate_den = den;
1357 }
1358 return err;
1359}
1360
1361/**
1362 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1363 * @runtime: PCM runtime instance
1364 * @cond: condition bits
1365 * @var: hw_params variable to apply the ratdens constraint
1366 * @r: struct snd_ratdens constriants
1367 *
1368 * Return: Zero if successful, or a negative error code on failure.
1369 */
1370int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1371 unsigned int cond,
1372 snd_pcm_hw_param_t var,
1373 const struct snd_pcm_hw_constraint_ratdens *r)
1374{
1375 return snd_pcm_hw_rule_add(runtime, cond, var,
1376 snd_pcm_hw_rule_ratdens, (void *)r,
1377 var, -1);
1378}
1379EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1380
1381static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1382 struct snd_pcm_hw_rule *rule)
1383{
1384 unsigned int l = (unsigned long) rule->private;
1385 int width = l & 0xffff;
1386 unsigned int msbits = l >> 16;
1387 const struct snd_interval *i =
1388 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1389
1390 if (!snd_interval_single(i))
1391 return 0;
1392
1393 if ((snd_interval_value(i) == width) ||
1394 (width == 0 && snd_interval_value(i) > msbits))
1395 params->msbits = min_not_zero(params->msbits, msbits);
1396
1397 return 0;
1398}
1399
1400/**
1401 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1402 * @runtime: PCM runtime instance
1403 * @cond: condition bits
1404 * @width: sample bits width
1405 * @msbits: msbits width
1406 *
1407 * This constraint will set the number of most significant bits (msbits) if a
1408 * sample format with the specified width has been select. If width is set to 0
1409 * the msbits will be set for any sample format with a width larger than the
1410 * specified msbits.
1411 *
1412 * Return: Zero if successful, or a negative error code on failure.
1413 */
1414int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1415 unsigned int cond,
1416 unsigned int width,
1417 unsigned int msbits)
1418{
1419 unsigned long l = (msbits << 16) | width;
1420 return snd_pcm_hw_rule_add(runtime, cond, -1,
1421 snd_pcm_hw_rule_msbits,
1422 (void*) l,
1423 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1424}
1425EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1426
1427static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1428 struct snd_pcm_hw_rule *rule)
1429{
1430 unsigned long step = (unsigned long) rule->private;
1431 return snd_interval_step(hw_param_interval(params, rule->var), step);
1432}
1433
1434/**
1435 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1436 * @runtime: PCM runtime instance
1437 * @cond: condition bits
1438 * @var: hw_params variable to apply the step constraint
1439 * @step: step size
1440 *
1441 * Return: Zero if successful, or a negative error code on failure.
1442 */
1443int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1444 unsigned int cond,
1445 snd_pcm_hw_param_t var,
1446 unsigned long step)
1447{
1448 return snd_pcm_hw_rule_add(runtime, cond, var,
1449 snd_pcm_hw_rule_step, (void *) step,
1450 var, -1);
1451}
1452EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1453
1454static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1455{
1456 static const unsigned int pow2_sizes[] = {
1457 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1458 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1459 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1460 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1461 };
1462 return snd_interval_list(hw_param_interval(params, rule->var),
1463 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1464}
1465
1466/**
1467 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1468 * @runtime: PCM runtime instance
1469 * @cond: condition bits
1470 * @var: hw_params variable to apply the power-of-2 constraint
1471 *
1472 * Return: Zero if successful, or a negative error code on failure.
1473 */
1474int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1475 unsigned int cond,
1476 snd_pcm_hw_param_t var)
1477{
1478 return snd_pcm_hw_rule_add(runtime, cond, var,
1479 snd_pcm_hw_rule_pow2, NULL,
1480 var, -1);
1481}
1482EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1483
1484static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1485 struct snd_pcm_hw_rule *rule)
1486{
1487 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1488 struct snd_interval *rate;
1489
1490 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1491 return snd_interval_list(rate, 1, &base_rate, 0);
1492}
1493
1494/**
1495 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1496 * @runtime: PCM runtime instance
1497 * @base_rate: the rate at which the hardware does not resample
1498 *
1499 * Return: Zero if successful, or a negative error code on failure.
1500 */
1501int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1502 unsigned int base_rate)
1503{
1504 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1505 SNDRV_PCM_HW_PARAM_RATE,
1506 snd_pcm_hw_rule_noresample_func,
1507 (void *)(uintptr_t)base_rate,
1508 SNDRV_PCM_HW_PARAM_RATE, -1);
1509}
1510EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1511
1512static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1513 snd_pcm_hw_param_t var)
1514{
1515 if (hw_is_mask(var)) {
1516 snd_mask_any(hw_param_mask(params, var));
1517 params->cmask |= 1 << var;
1518 params->rmask |= 1 << var;
1519 return;
1520 }
1521 if (hw_is_interval(var)) {
1522 snd_interval_any(hw_param_interval(params, var));
1523 params->cmask |= 1 << var;
1524 params->rmask |= 1 << var;
1525 return;
1526 }
1527 snd_BUG();
1528}
1529
1530void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1531{
1532 unsigned int k;
1533 memset(params, 0, sizeof(*params));
1534 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1535 _snd_pcm_hw_param_any(params, k);
1536 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1537 _snd_pcm_hw_param_any(params, k);
1538 params->info = ~0U;
1539}
1540EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1541
1542/**
1543 * snd_pcm_hw_param_value - return @params field @var value
1544 * @params: the hw_params instance
1545 * @var: parameter to retrieve
1546 * @dir: pointer to the direction (-1,0,1) or %NULL
1547 *
1548 * Return: The value for field @var if it's fixed in configuration space
1549 * defined by @params. -%EINVAL otherwise.
1550 */
1551int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1552 snd_pcm_hw_param_t var, int *dir)
1553{
1554 if (hw_is_mask(var)) {
1555 const struct snd_mask *mask = hw_param_mask_c(params, var);
1556 if (!snd_mask_single(mask))
1557 return -EINVAL;
1558 if (dir)
1559 *dir = 0;
1560 return snd_mask_value(mask);
1561 }
1562 if (hw_is_interval(var)) {
1563 const struct snd_interval *i = hw_param_interval_c(params, var);
1564 if (!snd_interval_single(i))
1565 return -EINVAL;
1566 if (dir)
1567 *dir = i->openmin;
1568 return snd_interval_value(i);
1569 }
1570 return -EINVAL;
1571}
1572EXPORT_SYMBOL(snd_pcm_hw_param_value);
1573
1574void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1575 snd_pcm_hw_param_t var)
1576{
1577 if (hw_is_mask(var)) {
1578 snd_mask_none(hw_param_mask(params, var));
1579 params->cmask |= 1 << var;
1580 params->rmask |= 1 << var;
1581 } else if (hw_is_interval(var)) {
1582 snd_interval_none(hw_param_interval(params, var));
1583 params->cmask |= 1 << var;
1584 params->rmask |= 1 << var;
1585 } else {
1586 snd_BUG();
1587 }
1588}
1589EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1590
1591static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1592 snd_pcm_hw_param_t var)
1593{
1594 int changed;
1595 if (hw_is_mask(var))
1596 changed = snd_mask_refine_first(hw_param_mask(params, var));
1597 else if (hw_is_interval(var))
1598 changed = snd_interval_refine_first(hw_param_interval(params, var));
1599 else
1600 return -EINVAL;
1601 if (changed > 0) {
1602 params->cmask |= 1 << var;
1603 params->rmask |= 1 << var;
1604 }
1605 return changed;
1606}
1607
1608
1609/**
1610 * snd_pcm_hw_param_first - refine config space and return minimum value
1611 * @pcm: PCM instance
1612 * @params: the hw_params instance
1613 * @var: parameter to retrieve
1614 * @dir: pointer to the direction (-1,0,1) or %NULL
1615 *
1616 * Inside configuration space defined by @params remove from @var all
1617 * values > minimum. Reduce configuration space accordingly.
1618 *
1619 * Return: The minimum, or a negative error code on failure.
1620 */
1621int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1622 struct snd_pcm_hw_params *params,
1623 snd_pcm_hw_param_t var, int *dir)
1624{
1625 int changed = _snd_pcm_hw_param_first(params, var);
1626 if (changed < 0)
1627 return changed;
1628 if (params->rmask) {
1629 int err = snd_pcm_hw_refine(pcm, params);
1630 if (err < 0)
1631 return err;
1632 }
1633 return snd_pcm_hw_param_value(params, var, dir);
1634}
1635EXPORT_SYMBOL(snd_pcm_hw_param_first);
1636
1637static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1638 snd_pcm_hw_param_t var)
1639{
1640 int changed;
1641 if (hw_is_mask(var))
1642 changed = snd_mask_refine_last(hw_param_mask(params, var));
1643 else if (hw_is_interval(var))
1644 changed = snd_interval_refine_last(hw_param_interval(params, var));
1645 else
1646 return -EINVAL;
1647 if (changed > 0) {
1648 params->cmask |= 1 << var;
1649 params->rmask |= 1 << var;
1650 }
1651 return changed;
1652}
1653
1654
1655/**
1656 * snd_pcm_hw_param_last - refine config space and return maximum value
1657 * @pcm: PCM instance
1658 * @params: the hw_params instance
1659 * @var: parameter to retrieve
1660 * @dir: pointer to the direction (-1,0,1) or %NULL
1661 *
1662 * Inside configuration space defined by @params remove from @var all
1663 * values < maximum. Reduce configuration space accordingly.
1664 *
1665 * Return: The maximum, or a negative error code on failure.
1666 */
1667int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1668 struct snd_pcm_hw_params *params,
1669 snd_pcm_hw_param_t var, int *dir)
1670{
1671 int changed = _snd_pcm_hw_param_last(params, var);
1672 if (changed < 0)
1673 return changed;
1674 if (params->rmask) {
1675 int err = snd_pcm_hw_refine(pcm, params);
1676 if (err < 0)
1677 return err;
1678 }
1679 return snd_pcm_hw_param_value(params, var, dir);
1680}
1681EXPORT_SYMBOL(snd_pcm_hw_param_last);
1682
1683static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1684 void *arg)
1685{
1686 struct snd_pcm_runtime *runtime = substream->runtime;
1687 unsigned long flags;
1688 snd_pcm_stream_lock_irqsave(substream, flags);
1689 if (snd_pcm_running(substream) &&
1690 snd_pcm_update_hw_ptr(substream) >= 0)
1691 runtime->status->hw_ptr %= runtime->buffer_size;
1692 else {
1693 runtime->status->hw_ptr = 0;
1694 runtime->hw_ptr_wrap = 0;
1695 }
1696 snd_pcm_stream_unlock_irqrestore(substream, flags);
1697 return 0;
1698}
1699
1700static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1701 void *arg)
1702{
1703 struct snd_pcm_channel_info *info = arg;
1704 struct snd_pcm_runtime *runtime = substream->runtime;
1705 int width;
1706 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1707 info->offset = -1;
1708 return 0;
1709 }
1710 width = snd_pcm_format_physical_width(runtime->format);
1711 if (width < 0)
1712 return width;
1713 info->offset = 0;
1714 switch (runtime->access) {
1715 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1716 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1717 info->first = info->channel * width;
1718 info->step = runtime->channels * width;
1719 break;
1720 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1721 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1722 {
1723 size_t size = runtime->dma_bytes / runtime->channels;
1724 info->first = info->channel * size * 8;
1725 info->step = width;
1726 break;
1727 }
1728 default:
1729 snd_BUG();
1730 break;
1731 }
1732 return 0;
1733}
1734
1735static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1736 void *arg)
1737{
1738 struct snd_pcm_hw_params *params = arg;
1739 snd_pcm_format_t format;
1740 int channels;
1741 ssize_t frame_size;
1742
1743 params->fifo_size = substream->runtime->hw.fifo_size;
1744 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1745 format = params_format(params);
1746 channels = params_channels(params);
1747 frame_size = snd_pcm_format_size(format, channels);
1748 if (frame_size > 0)
1749 params->fifo_size /= (unsigned)frame_size;
1750 }
1751 return 0;
1752}
1753
1754/**
1755 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1756 * @substream: the pcm substream instance
1757 * @cmd: ioctl command
1758 * @arg: ioctl argument
1759 *
1760 * Processes the generic ioctl commands for PCM.
1761 * Can be passed as the ioctl callback for PCM ops.
1762 *
1763 * Return: Zero if successful, or a negative error code on failure.
1764 */
1765int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1766 unsigned int cmd, void *arg)
1767{
1768 switch (cmd) {
1769 case SNDRV_PCM_IOCTL1_RESET:
1770 return snd_pcm_lib_ioctl_reset(substream, arg);
1771 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1772 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1773 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1774 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1775 }
1776 return -ENXIO;
1777}
1778EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1779
1780/**
1781 * snd_pcm_period_elapsed - update the pcm status for the next period
1782 * @substream: the pcm substream instance
1783 *
1784 * This function is called from the interrupt handler when the
1785 * PCM has processed the period size. It will update the current
1786 * pointer, wake up sleepers, etc.
1787 *
1788 * Even if more than one periods have elapsed since the last call, you
1789 * have to call this only once.
1790 */
1791void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1792{
1793 struct snd_pcm_runtime *runtime;
1794 unsigned long flags;
1795
1796 if (snd_BUG_ON(!substream))
1797 return;
1798
1799 snd_pcm_stream_lock_irqsave(substream, flags);
1800 if (PCM_RUNTIME_CHECK(substream))
1801 goto _unlock;
1802 runtime = substream->runtime;
1803
1804 if (!snd_pcm_running(substream) ||
1805 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1806 goto _end;
1807
1808#ifdef CONFIG_SND_PCM_TIMER
1809 if (substream->timer_running)
1810 snd_timer_interrupt(substream->timer, 1);
1811#endif
1812 _end:
1813 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1814 _unlock:
1815 snd_pcm_stream_unlock_irqrestore(substream, flags);
1816}
1817EXPORT_SYMBOL(snd_pcm_period_elapsed);
1818
1819/*
1820 * Wait until avail_min data becomes available
1821 * Returns a negative error code if any error occurs during operation.
1822 * The available space is stored on availp. When err = 0 and avail = 0
1823 * on the capture stream, it indicates the stream is in DRAINING state.
1824 */
1825static int wait_for_avail(struct snd_pcm_substream *substream,
1826 snd_pcm_uframes_t *availp)
1827{
1828 struct snd_pcm_runtime *runtime = substream->runtime;
1829 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1830 wait_queue_entry_t wait;
1831 int err = 0;
1832 snd_pcm_uframes_t avail = 0;
1833 long wait_time, tout;
1834
1835 init_waitqueue_entry(&wait, current);
1836 set_current_state(TASK_INTERRUPTIBLE);
1837 add_wait_queue(&runtime->tsleep, &wait);
1838
1839 if (runtime->no_period_wakeup)
1840 wait_time = MAX_SCHEDULE_TIMEOUT;
1841 else {
1842 /* use wait time from substream if available */
1843 if (substream->wait_time) {
1844 wait_time = substream->wait_time;
1845 } else {
1846 wait_time = 10;
1847
1848 if (runtime->rate) {
1849 long t = runtime->period_size * 2 /
1850 runtime->rate;
1851 wait_time = max(t, wait_time);
1852 }
1853 wait_time = msecs_to_jiffies(wait_time * 1000);
1854 }
1855 }
1856
1857 for (;;) {
1858 if (signal_pending(current)) {
1859 err = -ERESTARTSYS;
1860 break;
1861 }
1862
1863 /*
1864 * We need to check if space became available already
1865 * (and thus the wakeup happened already) first to close
1866 * the race of space already having become available.
1867 * This check must happen after been added to the waitqueue
1868 * and having current state be INTERRUPTIBLE.
1869 */
1870 avail = snd_pcm_avail(substream);
1871 if (avail >= runtime->twake)
1872 break;
1873 snd_pcm_stream_unlock_irq(substream);
1874
1875 tout = schedule_timeout(wait_time);
1876
1877 snd_pcm_stream_lock_irq(substream);
1878 set_current_state(TASK_INTERRUPTIBLE);
1879 switch (runtime->status->state) {
1880 case SNDRV_PCM_STATE_SUSPENDED:
1881 err = -ESTRPIPE;
1882 goto _endloop;
1883 case SNDRV_PCM_STATE_XRUN:
1884 err = -EPIPE;
1885 goto _endloop;
1886 case SNDRV_PCM_STATE_DRAINING:
1887 if (is_playback)
1888 err = -EPIPE;
1889 else
1890 avail = 0; /* indicate draining */
1891 goto _endloop;
1892 case SNDRV_PCM_STATE_OPEN:
1893 case SNDRV_PCM_STATE_SETUP:
1894 case SNDRV_PCM_STATE_DISCONNECTED:
1895 err = -EBADFD;
1896 goto _endloop;
1897 case SNDRV_PCM_STATE_PAUSED:
1898 continue;
1899 }
1900 if (!tout) {
1901 pcm_dbg(substream->pcm,
1902 "%s write error (DMA or IRQ trouble?)\n",
1903 is_playback ? "playback" : "capture");
1904 err = -EIO;
1905 break;
1906 }
1907 }
1908 _endloop:
1909 set_current_state(TASK_RUNNING);
1910 remove_wait_queue(&runtime->tsleep, &wait);
1911 *availp = avail;
1912 return err;
1913}
1914
1915typedef int (*pcm_transfer_f)(struct snd_pcm_substream *substream,
1916 int channel, unsigned long hwoff,
1917 void *buf, unsigned long bytes);
1918
1919typedef int (*pcm_copy_f)(struct snd_pcm_substream *, snd_pcm_uframes_t, void *,
1920 snd_pcm_uframes_t, snd_pcm_uframes_t, pcm_transfer_f);
1921
1922/* calculate the target DMA-buffer position to be written/read */
1923static void *get_dma_ptr(struct snd_pcm_runtime *runtime,
1924 int channel, unsigned long hwoff)
1925{
1926 return runtime->dma_area + hwoff +
1927 channel * (runtime->dma_bytes / runtime->channels);
1928}
1929
1930/* default copy_user ops for write; used for both interleaved and non- modes */
1931static int default_write_copy(struct snd_pcm_substream *substream,
1932 int channel, unsigned long hwoff,
1933 void *buf, unsigned long bytes)
1934{
1935 if (copy_from_user(get_dma_ptr(substream->runtime, channel, hwoff),
1936 (void __user *)buf, bytes))
1937 return -EFAULT;
1938 return 0;
1939}
1940
1941/* default copy_kernel ops for write */
1942static int default_write_copy_kernel(struct snd_pcm_substream *substream,
1943 int channel, unsigned long hwoff,
1944 void *buf, unsigned long bytes)
1945{
1946 memcpy(get_dma_ptr(substream->runtime, channel, hwoff), buf, bytes);
1947 return 0;
1948}
1949
1950/* fill silence instead of copy data; called as a transfer helper
1951 * from __snd_pcm_lib_write() or directly from noninterleaved_copy() when
1952 * a NULL buffer is passed
1953 */
1954static int fill_silence(struct snd_pcm_substream *substream, int channel,
1955 unsigned long hwoff, void *buf, unsigned long bytes)
1956{
1957 struct snd_pcm_runtime *runtime = substream->runtime;
1958
1959 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
1960 return 0;
1961 if (substream->ops->fill_silence)
1962 return substream->ops->fill_silence(substream, channel,
1963 hwoff, bytes);
1964
1965 snd_pcm_format_set_silence(runtime->format,
1966 get_dma_ptr(runtime, channel, hwoff),
1967 bytes_to_samples(runtime, bytes));
1968 return 0;
1969}
1970
1971/* default copy_user ops for read; used for both interleaved and non- modes */
1972static int default_read_copy(struct snd_pcm_substream *substream,
1973 int channel, unsigned long hwoff,
1974 void *buf, unsigned long bytes)
1975{
1976 if (copy_to_user((void __user *)buf,
1977 get_dma_ptr(substream->runtime, channel, hwoff),
1978 bytes))
1979 return -EFAULT;
1980 return 0;
1981}
1982
1983/* default copy_kernel ops for read */
1984static int default_read_copy_kernel(struct snd_pcm_substream *substream,
1985 int channel, unsigned long hwoff,
1986 void *buf, unsigned long bytes)
1987{
1988 memcpy(buf, get_dma_ptr(substream->runtime, channel, hwoff), bytes);
1989 return 0;
1990}
1991
1992/* call transfer function with the converted pointers and sizes;
1993 * for interleaved mode, it's one shot for all samples
1994 */
1995static int interleaved_copy(struct snd_pcm_substream *substream,
1996 snd_pcm_uframes_t hwoff, void *data,
1997 snd_pcm_uframes_t off,
1998 snd_pcm_uframes_t frames,
1999 pcm_transfer_f transfer)
2000{
2001 struct snd_pcm_runtime *runtime = substream->runtime;
2002
2003 /* convert to bytes */
2004 hwoff = frames_to_bytes(runtime, hwoff);
2005 off = frames_to_bytes(runtime, off);
2006 frames = frames_to_bytes(runtime, frames);
2007 return transfer(substream, 0, hwoff, data + off, frames);
2008}
2009
2010/* call transfer function with the converted pointers and sizes for each
2011 * non-interleaved channel; when buffer is NULL, silencing instead of copying
2012 */
2013static int noninterleaved_copy(struct snd_pcm_substream *substream,
2014 snd_pcm_uframes_t hwoff, void *data,
2015 snd_pcm_uframes_t off,
2016 snd_pcm_uframes_t frames,
2017 pcm_transfer_f transfer)
2018{
2019 struct snd_pcm_runtime *runtime = substream->runtime;
2020 int channels = runtime->channels;
2021 void **bufs = data;
2022 int c, err;
2023
2024 /* convert to bytes; note that it's not frames_to_bytes() here.
2025 * in non-interleaved mode, we copy for each channel, thus
2026 * each copy is n_samples bytes x channels = whole frames.
2027 */
2028 off = samples_to_bytes(runtime, off);
2029 frames = samples_to_bytes(runtime, frames);
2030 hwoff = samples_to_bytes(runtime, hwoff);
2031 for (c = 0; c < channels; ++c, ++bufs) {
2032 if (!data || !*bufs)
2033 err = fill_silence(substream, c, hwoff, NULL, frames);
2034 else
2035 err = transfer(substream, c, hwoff, *bufs + off,
2036 frames);
2037 if (err < 0)
2038 return err;
2039 }
2040 return 0;
2041}
2042
2043/* fill silence on the given buffer position;
2044 * called from snd_pcm_playback_silence()
2045 */
2046static int fill_silence_frames(struct snd_pcm_substream *substream,
2047 snd_pcm_uframes_t off, snd_pcm_uframes_t frames)
2048{
2049 if (substream->runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
2050 substream->runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)
2051 return interleaved_copy(substream, off, NULL, 0, frames,
2052 fill_silence);
2053 else
2054 return noninterleaved_copy(substream, off, NULL, 0, frames,
2055 fill_silence);
2056}
2057
2058/* sanity-check for read/write methods */
2059static int pcm_sanity_check(struct snd_pcm_substream *substream)
2060{
2061 struct snd_pcm_runtime *runtime;
2062 if (PCM_RUNTIME_CHECK(substream))
2063 return -ENXIO;
2064 runtime = substream->runtime;
2065 if (snd_BUG_ON(!substream->ops->copy_user && !runtime->dma_area))
2066 return -EINVAL;
2067 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2068 return -EBADFD;
2069 return 0;
2070}
2071
2072static int pcm_accessible_state(struct snd_pcm_runtime *runtime)
2073{
2074 switch (runtime->status->state) {
2075 case SNDRV_PCM_STATE_PREPARED:
2076 case SNDRV_PCM_STATE_RUNNING:
2077 case SNDRV_PCM_STATE_PAUSED:
2078 return 0;
2079 case SNDRV_PCM_STATE_XRUN:
2080 return -EPIPE;
2081 case SNDRV_PCM_STATE_SUSPENDED:
2082 return -ESTRPIPE;
2083 default:
2084 return -EBADFD;
2085 }
2086}
2087
2088/* update to the given appl_ptr and call ack callback if needed;
2089 * when an error is returned, take back to the original value
2090 */
2091int pcm_lib_apply_appl_ptr(struct snd_pcm_substream *substream,
2092 snd_pcm_uframes_t appl_ptr)
2093{
2094 struct snd_pcm_runtime *runtime = substream->runtime;
2095 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
2096 int ret;
2097
2098 if (old_appl_ptr == appl_ptr)
2099 return 0;
2100
2101 runtime->control->appl_ptr = appl_ptr;
2102 if (substream->ops->ack) {
2103 ret = substream->ops->ack(substream);
2104 if (ret < 0) {
2105 runtime->control->appl_ptr = old_appl_ptr;
2106 return ret;
2107 }
2108 }
2109
2110 trace_applptr(substream, old_appl_ptr, appl_ptr);
2111
2112 return 0;
2113}
2114
2115/* the common loop for read/write data */
2116snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
2117 void *data, bool interleaved,
2118 snd_pcm_uframes_t size, bool in_kernel)
2119{
2120 struct snd_pcm_runtime *runtime = substream->runtime;
2121 snd_pcm_uframes_t xfer = 0;
2122 snd_pcm_uframes_t offset = 0;
2123 snd_pcm_uframes_t avail;
2124 pcm_copy_f writer;
2125 pcm_transfer_f transfer;
2126 bool nonblock;
2127 bool is_playback;
2128 int err;
2129
2130 err = pcm_sanity_check(substream);
2131 if (err < 0)
2132 return err;
2133
2134 is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
2135 if (interleaved) {
2136 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2137 runtime->channels > 1)
2138 return -EINVAL;
2139 writer = interleaved_copy;
2140 } else {
2141 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2142 return -EINVAL;
2143 writer = noninterleaved_copy;
2144 }
2145
2146 if (!data) {
2147 if (is_playback)
2148 transfer = fill_silence;
2149 else
2150 return -EINVAL;
2151 } else if (in_kernel) {
2152 if (substream->ops->copy_kernel)
2153 transfer = substream->ops->copy_kernel;
2154 else
2155 transfer = is_playback ?
2156 default_write_copy_kernel : default_read_copy_kernel;
2157 } else {
2158 if (substream->ops->copy_user)
2159 transfer = (pcm_transfer_f)substream->ops->copy_user;
2160 else
2161 transfer = is_playback ?
2162 default_write_copy : default_read_copy;
2163 }
2164
2165 if (size == 0)
2166 return 0;
2167
2168 nonblock = !!(substream->f_flags & O_NONBLOCK);
2169
2170 snd_pcm_stream_lock_irq(substream);
2171 err = pcm_accessible_state(runtime);
2172 if (err < 0)
2173 goto _end_unlock;
2174
2175 runtime->twake = runtime->control->avail_min ? : 1;
2176 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2177 snd_pcm_update_hw_ptr(substream);
2178
2179 /*
2180 * If size < start_threshold, wait indefinitely. Another
2181 * thread may start capture
2182 */
2183 if (!is_playback &&
2184 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2185 size >= runtime->start_threshold) {
2186 err = snd_pcm_start(substream);
2187 if (err < 0)
2188 goto _end_unlock;
2189 }
2190
2191 avail = snd_pcm_avail(substream);
2192
2193 while (size > 0) {
2194 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2195 snd_pcm_uframes_t cont;
2196 if (!avail) {
2197 if (!is_playback &&
2198 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2199 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2200 goto _end_unlock;
2201 }
2202 if (nonblock) {
2203 err = -EAGAIN;
2204 goto _end_unlock;
2205 }
2206 runtime->twake = min_t(snd_pcm_uframes_t, size,
2207 runtime->control->avail_min ? : 1);
2208 err = wait_for_avail(substream, &avail);
2209 if (err < 0)
2210 goto _end_unlock;
2211 if (!avail)
2212 continue; /* draining */
2213 }
2214 frames = size > avail ? avail : size;
2215 appl_ptr = READ_ONCE(runtime->control->appl_ptr);
2216 appl_ofs = appl_ptr % runtime->buffer_size;
2217 cont = runtime->buffer_size - appl_ofs;
2218 if (frames > cont)
2219 frames = cont;
2220 if (snd_BUG_ON(!frames)) {
2221 err = -EINVAL;
2222 goto _end_unlock;
2223 }
2224 snd_pcm_stream_unlock_irq(substream);
2225 err = writer(substream, appl_ofs, data, offset, frames,
2226 transfer);
2227 snd_pcm_stream_lock_irq(substream);
2228 if (err < 0)
2229 goto _end_unlock;
2230 err = pcm_accessible_state(runtime);
2231 if (err < 0)
2232 goto _end_unlock;
2233 appl_ptr += frames;
2234 if (appl_ptr >= runtime->boundary)
2235 appl_ptr -= runtime->boundary;
2236 err = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2237 if (err < 0)
2238 goto _end_unlock;
2239
2240 offset += frames;
2241 size -= frames;
2242 xfer += frames;
2243 avail -= frames;
2244 if (is_playback &&
2245 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2246 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2247 err = snd_pcm_start(substream);
2248 if (err < 0)
2249 goto _end_unlock;
2250 }
2251 }
2252 _end_unlock:
2253 runtime->twake = 0;
2254 if (xfer > 0 && err >= 0)
2255 snd_pcm_update_state(substream, runtime);
2256 snd_pcm_stream_unlock_irq(substream);
2257 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2258}
2259EXPORT_SYMBOL(__snd_pcm_lib_xfer);
2260
2261/*
2262 * standard channel mapping helpers
2263 */
2264
2265/* default channel maps for multi-channel playbacks, up to 8 channels */
2266const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2267 { .channels = 1,
2268 .map = { SNDRV_CHMAP_MONO } },
2269 { .channels = 2,
2270 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2271 { .channels = 4,
2272 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2273 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2274 { .channels = 6,
2275 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2276 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2277 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2278 { .channels = 8,
2279 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2280 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2281 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2282 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2283 { }
2284};
2285EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2286
2287/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2288const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2289 { .channels = 1,
2290 .map = { SNDRV_CHMAP_MONO } },
2291 { .channels = 2,
2292 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2293 { .channels = 4,
2294 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2295 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2296 { .channels = 6,
2297 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2298 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2299 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2300 { .channels = 8,
2301 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2302 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2303 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2304 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2305 { }
2306};
2307EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2308
2309static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2310{
2311 if (ch > info->max_channels)
2312 return false;
2313 return !info->channel_mask || (info->channel_mask & (1U << ch));
2314}
2315
2316static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2317 struct snd_ctl_elem_info *uinfo)
2318{
2319 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2320
2321 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2322 uinfo->count = info->max_channels;
2323 uinfo->value.integer.min = 0;
2324 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2325 return 0;
2326}
2327
2328/* get callback for channel map ctl element
2329 * stores the channel position firstly matching with the current channels
2330 */
2331static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2332 struct snd_ctl_elem_value *ucontrol)
2333{
2334 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2335 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2336 struct snd_pcm_substream *substream;
2337 const struct snd_pcm_chmap_elem *map;
2338
2339 if (!info->chmap)
2340 return -EINVAL;
2341 substream = snd_pcm_chmap_substream(info, idx);
2342 if (!substream)
2343 return -ENODEV;
2344 memset(ucontrol->value.integer.value, 0,
2345 sizeof(long) * info->max_channels);
2346 if (!substream->runtime)
2347 return 0; /* no channels set */
2348 for (map = info->chmap; map->channels; map++) {
2349 int i;
2350 if (map->channels == substream->runtime->channels &&
2351 valid_chmap_channels(info, map->channels)) {
2352 for (i = 0; i < map->channels; i++)
2353 ucontrol->value.integer.value[i] = map->map[i];
2354 return 0;
2355 }
2356 }
2357 return -EINVAL;
2358}
2359
2360/* tlv callback for channel map ctl element
2361 * expands the pre-defined channel maps in a form of TLV
2362 */
2363static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2364 unsigned int size, unsigned int __user *tlv)
2365{
2366 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2367 const struct snd_pcm_chmap_elem *map;
2368 unsigned int __user *dst;
2369 int c, count = 0;
2370
2371 if (!info->chmap)
2372 return -EINVAL;
2373 if (size < 8)
2374 return -ENOMEM;
2375 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2376 return -EFAULT;
2377 size -= 8;
2378 dst = tlv + 2;
2379 for (map = info->chmap; map->channels; map++) {
2380 int chs_bytes = map->channels * 4;
2381 if (!valid_chmap_channels(info, map->channels))
2382 continue;
2383 if (size < 8)
2384 return -ENOMEM;
2385 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2386 put_user(chs_bytes, dst + 1))
2387 return -EFAULT;
2388 dst += 2;
2389 size -= 8;
2390 count += 8;
2391 if (size < chs_bytes)
2392 return -ENOMEM;
2393 size -= chs_bytes;
2394 count += chs_bytes;
2395 for (c = 0; c < map->channels; c++) {
2396 if (put_user(map->map[c], dst))
2397 return -EFAULT;
2398 dst++;
2399 }
2400 }
2401 if (put_user(count, tlv + 1))
2402 return -EFAULT;
2403 return 0;
2404}
2405
2406static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2407{
2408 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2409 info->pcm->streams[info->stream].chmap_kctl = NULL;
2410 kfree(info);
2411}
2412
2413/**
2414 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2415 * @pcm: the assigned PCM instance
2416 * @stream: stream direction
2417 * @chmap: channel map elements (for query)
2418 * @max_channels: the max number of channels for the stream
2419 * @private_value: the value passed to each kcontrol's private_value field
2420 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2421 *
2422 * Create channel-mapping control elements assigned to the given PCM stream(s).
2423 * Return: Zero if successful, or a negative error value.
2424 */
2425int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2426 const struct snd_pcm_chmap_elem *chmap,
2427 int max_channels,
2428 unsigned long private_value,
2429 struct snd_pcm_chmap **info_ret)
2430{
2431 struct snd_pcm_chmap *info;
2432 struct snd_kcontrol_new knew = {
2433 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2434 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2435 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2436 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2437 .info = pcm_chmap_ctl_info,
2438 .get = pcm_chmap_ctl_get,
2439 .tlv.c = pcm_chmap_ctl_tlv,
2440 };
2441 int err;
2442
2443 if (WARN_ON(pcm->streams[stream].chmap_kctl))
2444 return -EBUSY;
2445 info = kzalloc(sizeof(*info), GFP_KERNEL);
2446 if (!info)
2447 return -ENOMEM;
2448 info->pcm = pcm;
2449 info->stream = stream;
2450 info->chmap = chmap;
2451 info->max_channels = max_channels;
2452 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2453 knew.name = "Playback Channel Map";
2454 else
2455 knew.name = "Capture Channel Map";
2456 knew.device = pcm->device;
2457 knew.count = pcm->streams[stream].substream_count;
2458 knew.private_value = private_value;
2459 info->kctl = snd_ctl_new1(&knew, info);
2460 if (!info->kctl) {
2461 kfree(info);
2462 return -ENOMEM;
2463 }
2464 info->kctl->private_free = pcm_chmap_ctl_private_free;
2465 err = snd_ctl_add(pcm->card, info->kctl);
2466 if (err < 0)
2467 return err;
2468 pcm->streams[stream].chmap_kctl = info->kctl;
2469 if (info_ret)
2470 *info_ret = info;
2471 return 0;
2472}
2473EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);
1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Abramo Bagnara <abramo@alsa-project.org>
5 *
6 *
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.
11 *
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.
16 *
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
20 *
21 */
22
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>
32
33/*
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
39 *
40 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
41 */
42void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
43{
44 struct snd_pcm_runtime *runtime = substream->runtime;
45 snd_pcm_uframes_t frames, ofs, transfer;
46
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;
51 if (n < 0)
52 n += runtime->boundary;
53 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
54 runtime->silence_filled -= n;
55 else
56 runtime->silence_filled = 0;
57 runtime->silence_start = runtime->control->appl_ptr;
58 }
59 if (runtime->silence_filled >= runtime->buffer_size)
60 return;
61 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
62 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
63 return;
64 frames = runtime->silence_threshold - noise_dist;
65 if (frames > runtime->silence_size)
66 frames = runtime->silence_size;
67 } else {
68 if (new_hw_ptr == ULONG_MAX) { /* initialization */
69 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
70 if (avail > runtime->buffer_size)
71 avail = runtime->buffer_size;
72 runtime->silence_filled = avail > 0 ? avail : 0;
73 runtime->silence_start = (runtime->status->hw_ptr +
74 runtime->silence_filled) %
75 runtime->boundary;
76 } else {
77 ofs = runtime->status->hw_ptr;
78 frames = new_hw_ptr - ofs;
79 if ((snd_pcm_sframes_t)frames < 0)
80 frames += runtime->boundary;
81 runtime->silence_filled -= frames;
82 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
83 runtime->silence_filled = 0;
84 runtime->silence_start = new_hw_ptr;
85 } else {
86 runtime->silence_start = ofs;
87 }
88 }
89 frames = runtime->buffer_size - runtime->silence_filled;
90 }
91 if (snd_BUG_ON(frames > runtime->buffer_size))
92 return;
93 if (frames == 0)
94 return;
95 ofs = runtime->silence_start % runtime->buffer_size;
96 while (frames > 0) {
97 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
98 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
99 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
100 if (substream->ops->silence) {
101 int err;
102 err = substream->ops->silence(substream, -1, ofs, transfer);
103 snd_BUG_ON(err < 0);
104 } else {
105 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
106 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
107 }
108 } else {
109 unsigned int c;
110 unsigned int channels = runtime->channels;
111 if (substream->ops->silence) {
112 for (c = 0; c < channels; ++c) {
113 int err;
114 err = substream->ops->silence(substream, c, ofs, transfer);
115 snd_BUG_ON(err < 0);
116 }
117 } else {
118 size_t dma_csize = runtime->dma_bytes / channels;
119 for (c = 0; c < channels; ++c) {
120 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
121 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
122 }
123 }
124 }
125 runtime->silence_filled += transfer;
126 frames -= transfer;
127 ofs = 0;
128 }
129}
130
131#ifdef CONFIG_SND_DEBUG
132void snd_pcm_debug_name(struct snd_pcm_substream *substream,
133 char *name, size_t len)
134{
135 snprintf(name, len, "pcmC%dD%d%c:%d",
136 substream->pcm->card->number,
137 substream->pcm->device,
138 substream->stream ? 'c' : 'p',
139 substream->number);
140}
141EXPORT_SYMBOL(snd_pcm_debug_name);
142#endif
143
144#define XRUN_DEBUG_BASIC (1<<0)
145#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
146#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
147#define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
148#define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
149#define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
150#define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
151
152#ifdef CONFIG_SND_PCM_XRUN_DEBUG
153
154#define xrun_debug(substream, mask) \
155 ((substream)->pstr->xrun_debug & (mask))
156#else
157#define xrun_debug(substream, mask) 0
158#endif
159
160#define dump_stack_on_xrun(substream) do { \
161 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
162 dump_stack(); \
163 } while (0)
164
165static void xrun(struct snd_pcm_substream *substream)
166{
167 struct snd_pcm_runtime *runtime = substream->runtime;
168
169 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
170 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
171 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
172 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
173 char name[16];
174 snd_pcm_debug_name(substream, name, sizeof(name));
175 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
176 dump_stack_on_xrun(substream);
177 }
178}
179
180#ifdef CONFIG_SND_PCM_XRUN_DEBUG
181#define hw_ptr_error(substream, fmt, args...) \
182 do { \
183 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
184 xrun_log_show(substream); \
185 if (printk_ratelimit()) { \
186 snd_printd("PCM: " fmt, ##args); \
187 } \
188 dump_stack_on_xrun(substream); \
189 } \
190 } while (0)
191
192#define XRUN_LOG_CNT 10
193
194struct hwptr_log_entry {
195 unsigned int in_interrupt;
196 unsigned long jiffies;
197 snd_pcm_uframes_t pos;
198 snd_pcm_uframes_t period_size;
199 snd_pcm_uframes_t buffer_size;
200 snd_pcm_uframes_t old_hw_ptr;
201 snd_pcm_uframes_t hw_ptr_base;
202};
203
204struct snd_pcm_hwptr_log {
205 unsigned int idx;
206 unsigned int hit: 1;
207 struct hwptr_log_entry entries[XRUN_LOG_CNT];
208};
209
210static void xrun_log(struct snd_pcm_substream *substream,
211 snd_pcm_uframes_t pos, int in_interrupt)
212{
213 struct snd_pcm_runtime *runtime = substream->runtime;
214 struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
215 struct hwptr_log_entry *entry;
216
217 if (log == NULL) {
218 log = kzalloc(sizeof(*log), GFP_ATOMIC);
219 if (log == NULL)
220 return;
221 runtime->hwptr_log = log;
222 } else {
223 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
224 return;
225 }
226 entry = &log->entries[log->idx];
227 entry->in_interrupt = in_interrupt;
228 entry->jiffies = jiffies;
229 entry->pos = pos;
230 entry->period_size = runtime->period_size;
231 entry->buffer_size = runtime->buffer_size;
232 entry->old_hw_ptr = runtime->status->hw_ptr;
233 entry->hw_ptr_base = runtime->hw_ptr_base;
234 log->idx = (log->idx + 1) % XRUN_LOG_CNT;
235}
236
237static void xrun_log_show(struct snd_pcm_substream *substream)
238{
239 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
240 struct hwptr_log_entry *entry;
241 char name[16];
242 unsigned int idx;
243 int cnt;
244
245 if (log == NULL)
246 return;
247 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
248 return;
249 snd_pcm_debug_name(substream, name, sizeof(name));
250 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
251 entry = &log->entries[idx];
252 if (entry->period_size == 0)
253 break;
254 snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
255 "hwptr=%ld/%ld\n",
256 name, entry->in_interrupt ? "[Q] " : "",
257 entry->jiffies,
258 (unsigned long)entry->pos,
259 (unsigned long)entry->period_size,
260 (unsigned long)entry->buffer_size,
261 (unsigned long)entry->old_hw_ptr,
262 (unsigned long)entry->hw_ptr_base);
263 idx++;
264 idx %= XRUN_LOG_CNT;
265 }
266 log->hit = 1;
267}
268
269#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
270
271#define hw_ptr_error(substream, fmt, args...) do { } while (0)
272#define xrun_log(substream, pos, in_interrupt) do { } while (0)
273#define xrun_log_show(substream) do { } while (0)
274
275#endif
276
277int snd_pcm_update_state(struct snd_pcm_substream *substream,
278 struct snd_pcm_runtime *runtime)
279{
280 snd_pcm_uframes_t avail;
281
282 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
283 avail = snd_pcm_playback_avail(runtime);
284 else
285 avail = snd_pcm_capture_avail(runtime);
286 if (avail > runtime->avail_max)
287 runtime->avail_max = avail;
288 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
289 if (avail >= runtime->buffer_size) {
290 snd_pcm_drain_done(substream);
291 return -EPIPE;
292 }
293 } else {
294 if (avail >= runtime->stop_threshold) {
295 xrun(substream);
296 return -EPIPE;
297 }
298 }
299 if (runtime->twake) {
300 if (avail >= runtime->twake)
301 wake_up(&runtime->tsleep);
302 } else if (avail >= runtime->control->avail_min)
303 wake_up(&runtime->sleep);
304 return 0;
305}
306
307static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
308 unsigned int in_interrupt)
309{
310 struct snd_pcm_runtime *runtime = substream->runtime;
311 snd_pcm_uframes_t pos;
312 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
313 snd_pcm_sframes_t hdelta, delta;
314 unsigned long jdelta;
315
316 old_hw_ptr = runtime->status->hw_ptr;
317 pos = substream->ops->pointer(substream);
318 if (pos == SNDRV_PCM_POS_XRUN) {
319 xrun(substream);
320 return -EPIPE;
321 }
322 if (pos >= runtime->buffer_size) {
323 if (printk_ratelimit()) {
324 char name[16];
325 snd_pcm_debug_name(substream, name, sizeof(name));
326 xrun_log_show(substream);
327 snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
328 "buffer size = %ld, period size = %ld\n",
329 name, pos, runtime->buffer_size,
330 runtime->period_size);
331 }
332 pos = 0;
333 }
334 pos -= pos % runtime->min_align;
335 if (xrun_debug(substream, XRUN_DEBUG_LOG))
336 xrun_log(substream, pos, in_interrupt);
337 hw_base = runtime->hw_ptr_base;
338 new_hw_ptr = hw_base + pos;
339 if (in_interrupt) {
340 /* we know that one period was processed */
341 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
342 delta = runtime->hw_ptr_interrupt + runtime->period_size;
343 if (delta > new_hw_ptr) {
344 /* check for double acknowledged interrupts */
345 hdelta = jiffies - runtime->hw_ptr_jiffies;
346 if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
347 hw_base += runtime->buffer_size;
348 if (hw_base >= runtime->boundary)
349 hw_base = 0;
350 new_hw_ptr = hw_base + pos;
351 goto __delta;
352 }
353 }
354 }
355 /* new_hw_ptr might be lower than old_hw_ptr in case when */
356 /* pointer crosses the end of the ring buffer */
357 if (new_hw_ptr < old_hw_ptr) {
358 hw_base += runtime->buffer_size;
359 if (hw_base >= runtime->boundary)
360 hw_base = 0;
361 new_hw_ptr = hw_base + pos;
362 }
363 __delta:
364 delta = new_hw_ptr - old_hw_ptr;
365 if (delta < 0)
366 delta += runtime->boundary;
367 if (xrun_debug(substream, in_interrupt ?
368 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
369 char name[16];
370 snd_pcm_debug_name(substream, name, sizeof(name));
371 snd_printd("%s_update: %s: pos=%u/%u/%u, "
372 "hwptr=%ld/%ld/%ld/%ld\n",
373 in_interrupt ? "period" : "hwptr",
374 name,
375 (unsigned int)pos,
376 (unsigned int)runtime->period_size,
377 (unsigned int)runtime->buffer_size,
378 (unsigned long)delta,
379 (unsigned long)old_hw_ptr,
380 (unsigned long)new_hw_ptr,
381 (unsigned long)runtime->hw_ptr_base);
382 }
383
384 if (runtime->no_period_wakeup) {
385 snd_pcm_sframes_t xrun_threshold;
386 /*
387 * Without regular period interrupts, we have to check
388 * the elapsed time to detect xruns.
389 */
390 jdelta = jiffies - runtime->hw_ptr_jiffies;
391 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
392 goto no_delta_check;
393 hdelta = jdelta - delta * HZ / runtime->rate;
394 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
395 while (hdelta > xrun_threshold) {
396 delta += runtime->buffer_size;
397 hw_base += runtime->buffer_size;
398 if (hw_base >= runtime->boundary)
399 hw_base = 0;
400 new_hw_ptr = hw_base + pos;
401 hdelta -= runtime->hw_ptr_buffer_jiffies;
402 }
403 goto no_delta_check;
404 }
405
406 /* something must be really wrong */
407 if (delta >= runtime->buffer_size + runtime->period_size) {
408 hw_ptr_error(substream,
409 "Unexpected hw_pointer value %s"
410 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
411 "old_hw_ptr=%ld)\n",
412 in_interrupt ? "[Q] " : "[P]",
413 substream->stream, (long)pos,
414 (long)new_hw_ptr, (long)old_hw_ptr);
415 return 0;
416 }
417
418 /* Do jiffies check only in xrun_debug mode */
419 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
420 goto no_jiffies_check;
421
422 /* Skip the jiffies check for hardwares with BATCH flag.
423 * Such hardware usually just increases the position at each IRQ,
424 * thus it can't give any strange position.
425 */
426 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
427 goto no_jiffies_check;
428 hdelta = delta;
429 if (hdelta < runtime->delay)
430 goto no_jiffies_check;
431 hdelta -= runtime->delay;
432 jdelta = jiffies - runtime->hw_ptr_jiffies;
433 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
434 delta = jdelta /
435 (((runtime->period_size * HZ) / runtime->rate)
436 + HZ/100);
437 /* move new_hw_ptr according jiffies not pos variable */
438 new_hw_ptr = old_hw_ptr;
439 hw_base = delta;
440 /* use loop to avoid checks for delta overflows */
441 /* the delta value is small or zero in most cases */
442 while (delta > 0) {
443 new_hw_ptr += runtime->period_size;
444 if (new_hw_ptr >= runtime->boundary)
445 new_hw_ptr -= runtime->boundary;
446 delta--;
447 }
448 /* align hw_base to buffer_size */
449 hw_ptr_error(substream,
450 "hw_ptr skipping! %s"
451 "(pos=%ld, delta=%ld, period=%ld, "
452 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
453 in_interrupt ? "[Q] " : "",
454 (long)pos, (long)hdelta,
455 (long)runtime->period_size, jdelta,
456 ((hdelta * HZ) / runtime->rate), hw_base,
457 (unsigned long)old_hw_ptr,
458 (unsigned long)new_hw_ptr);
459 /* reset values to proper state */
460 delta = 0;
461 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
462 }
463 no_jiffies_check:
464 if (delta > runtime->period_size + runtime->period_size / 2) {
465 hw_ptr_error(substream,
466 "Lost interrupts? %s"
467 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
468 "old_hw_ptr=%ld)\n",
469 in_interrupt ? "[Q] " : "",
470 substream->stream, (long)delta,
471 (long)new_hw_ptr,
472 (long)old_hw_ptr);
473 }
474
475 no_delta_check:
476 if (runtime->status->hw_ptr == new_hw_ptr)
477 return 0;
478
479 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
480 runtime->silence_size > 0)
481 snd_pcm_playback_silence(substream, new_hw_ptr);
482
483 if (in_interrupt) {
484 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
485 if (delta < 0)
486 delta += runtime->boundary;
487 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
488 runtime->hw_ptr_interrupt += delta;
489 if (runtime->hw_ptr_interrupt >= runtime->boundary)
490 runtime->hw_ptr_interrupt -= runtime->boundary;
491 }
492 runtime->hw_ptr_base = hw_base;
493 runtime->status->hw_ptr = new_hw_ptr;
494 runtime->hw_ptr_jiffies = jiffies;
495 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
496 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
497
498 return snd_pcm_update_state(substream, runtime);
499}
500
501/* CAUTION: call it with irq disabled */
502int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
503{
504 return snd_pcm_update_hw_ptr0(substream, 0);
505}
506
507/**
508 * snd_pcm_set_ops - set the PCM operators
509 * @pcm: the pcm instance
510 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
511 * @ops: the operator table
512 *
513 * Sets the given PCM operators to the pcm instance.
514 */
515void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
516{
517 struct snd_pcm_str *stream = &pcm->streams[direction];
518 struct snd_pcm_substream *substream;
519
520 for (substream = stream->substream; substream != NULL; substream = substream->next)
521 substream->ops = ops;
522}
523
524EXPORT_SYMBOL(snd_pcm_set_ops);
525
526/**
527 * snd_pcm_sync - set the PCM sync id
528 * @substream: the pcm substream
529 *
530 * Sets the PCM sync identifier for the card.
531 */
532void snd_pcm_set_sync(struct snd_pcm_substream *substream)
533{
534 struct snd_pcm_runtime *runtime = substream->runtime;
535
536 runtime->sync.id32[0] = substream->pcm->card->number;
537 runtime->sync.id32[1] = -1;
538 runtime->sync.id32[2] = -1;
539 runtime->sync.id32[3] = -1;
540}
541
542EXPORT_SYMBOL(snd_pcm_set_sync);
543
544/*
545 * Standard ioctl routine
546 */
547
548static inline unsigned int div32(unsigned int a, unsigned int b,
549 unsigned int *r)
550{
551 if (b == 0) {
552 *r = 0;
553 return UINT_MAX;
554 }
555 *r = a % b;
556 return a / b;
557}
558
559static inline unsigned int div_down(unsigned int a, unsigned int b)
560{
561 if (b == 0)
562 return UINT_MAX;
563 return a / b;
564}
565
566static inline unsigned int div_up(unsigned int a, unsigned int b)
567{
568 unsigned int r;
569 unsigned int q;
570 if (b == 0)
571 return UINT_MAX;
572 q = div32(a, b, &r);
573 if (r)
574 ++q;
575 return q;
576}
577
578static inline unsigned int mul(unsigned int a, unsigned int b)
579{
580 if (a == 0)
581 return 0;
582 if (div_down(UINT_MAX, a) < b)
583 return UINT_MAX;
584 return a * b;
585}
586
587static inline unsigned int muldiv32(unsigned int a, unsigned int b,
588 unsigned int c, unsigned int *r)
589{
590 u_int64_t n = (u_int64_t) a * b;
591 if (c == 0) {
592 snd_BUG_ON(!n);
593 *r = 0;
594 return UINT_MAX;
595 }
596 n = div_u64_rem(n, c, r);
597 if (n >= UINT_MAX) {
598 *r = 0;
599 return UINT_MAX;
600 }
601 return n;
602}
603
604/**
605 * snd_interval_refine - refine the interval value of configurator
606 * @i: the interval value to refine
607 * @v: the interval value to refer to
608 *
609 * Refines the interval value with the reference value.
610 * The interval is changed to the range satisfying both intervals.
611 * The interval status (min, max, integer, etc.) are evaluated.
612 *
613 * Returns non-zero if the value is changed, zero if not changed.
614 */
615int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
616{
617 int changed = 0;
618 if (snd_BUG_ON(snd_interval_empty(i)))
619 return -EINVAL;
620 if (i->min < v->min) {
621 i->min = v->min;
622 i->openmin = v->openmin;
623 changed = 1;
624 } else if (i->min == v->min && !i->openmin && v->openmin) {
625 i->openmin = 1;
626 changed = 1;
627 }
628 if (i->max > v->max) {
629 i->max = v->max;
630 i->openmax = v->openmax;
631 changed = 1;
632 } else if (i->max == v->max && !i->openmax && v->openmax) {
633 i->openmax = 1;
634 changed = 1;
635 }
636 if (!i->integer && v->integer) {
637 i->integer = 1;
638 changed = 1;
639 }
640 if (i->integer) {
641 if (i->openmin) {
642 i->min++;
643 i->openmin = 0;
644 }
645 if (i->openmax) {
646 i->max--;
647 i->openmax = 0;
648 }
649 } else if (!i->openmin && !i->openmax && i->min == i->max)
650 i->integer = 1;
651 if (snd_interval_checkempty(i)) {
652 snd_interval_none(i);
653 return -EINVAL;
654 }
655 return changed;
656}
657
658EXPORT_SYMBOL(snd_interval_refine);
659
660static int snd_interval_refine_first(struct snd_interval *i)
661{
662 if (snd_BUG_ON(snd_interval_empty(i)))
663 return -EINVAL;
664 if (snd_interval_single(i))
665 return 0;
666 i->max = i->min;
667 i->openmax = i->openmin;
668 if (i->openmax)
669 i->max++;
670 return 1;
671}
672
673static int snd_interval_refine_last(struct snd_interval *i)
674{
675 if (snd_BUG_ON(snd_interval_empty(i)))
676 return -EINVAL;
677 if (snd_interval_single(i))
678 return 0;
679 i->min = i->max;
680 i->openmin = i->openmax;
681 if (i->openmin)
682 i->min--;
683 return 1;
684}
685
686void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
687{
688 if (a->empty || b->empty) {
689 snd_interval_none(c);
690 return;
691 }
692 c->empty = 0;
693 c->min = mul(a->min, b->min);
694 c->openmin = (a->openmin || b->openmin);
695 c->max = mul(a->max, b->max);
696 c->openmax = (a->openmax || b->openmax);
697 c->integer = (a->integer && b->integer);
698}
699
700/**
701 * snd_interval_div - refine the interval value with division
702 * @a: dividend
703 * @b: divisor
704 * @c: quotient
705 *
706 * c = a / b
707 *
708 * Returns non-zero if the value is changed, zero if not changed.
709 */
710void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
711{
712 unsigned int r;
713 if (a->empty || b->empty) {
714 snd_interval_none(c);
715 return;
716 }
717 c->empty = 0;
718 c->min = div32(a->min, b->max, &r);
719 c->openmin = (r || a->openmin || b->openmax);
720 if (b->min > 0) {
721 c->max = div32(a->max, b->min, &r);
722 if (r) {
723 c->max++;
724 c->openmax = 1;
725 } else
726 c->openmax = (a->openmax || b->openmin);
727 } else {
728 c->max = UINT_MAX;
729 c->openmax = 0;
730 }
731 c->integer = 0;
732}
733
734/**
735 * snd_interval_muldivk - refine the interval value
736 * @a: dividend 1
737 * @b: dividend 2
738 * @k: divisor (as integer)
739 * @c: result
740 *
741 * c = a * b / k
742 *
743 * Returns non-zero if the value is changed, zero if not changed.
744 */
745void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
746 unsigned int k, struct snd_interval *c)
747{
748 unsigned int r;
749 if (a->empty || b->empty) {
750 snd_interval_none(c);
751 return;
752 }
753 c->empty = 0;
754 c->min = muldiv32(a->min, b->min, k, &r);
755 c->openmin = (r || a->openmin || b->openmin);
756 c->max = muldiv32(a->max, b->max, k, &r);
757 if (r) {
758 c->max++;
759 c->openmax = 1;
760 } else
761 c->openmax = (a->openmax || b->openmax);
762 c->integer = 0;
763}
764
765/**
766 * snd_interval_mulkdiv - refine the interval value
767 * @a: dividend 1
768 * @k: dividend 2 (as integer)
769 * @b: divisor
770 * @c: result
771 *
772 * c = a * k / b
773 *
774 * Returns non-zero if the value is changed, zero if not changed.
775 */
776void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
777 const struct snd_interval *b, struct snd_interval *c)
778{
779 unsigned int r;
780 if (a->empty || b->empty) {
781 snd_interval_none(c);
782 return;
783 }
784 c->empty = 0;
785 c->min = muldiv32(a->min, k, b->max, &r);
786 c->openmin = (r || a->openmin || b->openmax);
787 if (b->min > 0) {
788 c->max = muldiv32(a->max, k, b->min, &r);
789 if (r) {
790 c->max++;
791 c->openmax = 1;
792 } else
793 c->openmax = (a->openmax || b->openmin);
794 } else {
795 c->max = UINT_MAX;
796 c->openmax = 0;
797 }
798 c->integer = 0;
799}
800
801/* ---- */
802
803
804/**
805 * snd_interval_ratnum - refine the interval value
806 * @i: interval to refine
807 * @rats_count: number of ratnum_t
808 * @rats: ratnum_t array
809 * @nump: pointer to store the resultant numerator
810 * @denp: pointer to store the resultant denominator
811 *
812 * Returns non-zero if the value is changed, zero if not changed.
813 */
814int snd_interval_ratnum(struct snd_interval *i,
815 unsigned int rats_count, struct snd_ratnum *rats,
816 unsigned int *nump, unsigned int *denp)
817{
818 unsigned int best_num, best_den;
819 int best_diff;
820 unsigned int k;
821 struct snd_interval t;
822 int err;
823 unsigned int result_num, result_den;
824 int result_diff;
825
826 best_num = best_den = best_diff = 0;
827 for (k = 0; k < rats_count; ++k) {
828 unsigned int num = rats[k].num;
829 unsigned int den;
830 unsigned int q = i->min;
831 int diff;
832 if (q == 0)
833 q = 1;
834 den = div_up(num, q);
835 if (den < rats[k].den_min)
836 continue;
837 if (den > rats[k].den_max)
838 den = rats[k].den_max;
839 else {
840 unsigned int r;
841 r = (den - rats[k].den_min) % rats[k].den_step;
842 if (r != 0)
843 den -= r;
844 }
845 diff = num - q * den;
846 if (diff < 0)
847 diff = -diff;
848 if (best_num == 0 ||
849 diff * best_den < best_diff * den) {
850 best_diff = diff;
851 best_den = den;
852 best_num = num;
853 }
854 }
855 if (best_den == 0) {
856 i->empty = 1;
857 return -EINVAL;
858 }
859 t.min = div_down(best_num, best_den);
860 t.openmin = !!(best_num % best_den);
861
862 result_num = best_num;
863 result_diff = best_diff;
864 result_den = best_den;
865 best_num = best_den = best_diff = 0;
866 for (k = 0; k < rats_count; ++k) {
867 unsigned int num = rats[k].num;
868 unsigned int den;
869 unsigned int q = i->max;
870 int diff;
871 if (q == 0) {
872 i->empty = 1;
873 return -EINVAL;
874 }
875 den = div_down(num, q);
876 if (den > rats[k].den_max)
877 continue;
878 if (den < rats[k].den_min)
879 den = rats[k].den_min;
880 else {
881 unsigned int r;
882 r = (den - rats[k].den_min) % rats[k].den_step;
883 if (r != 0)
884 den += rats[k].den_step - r;
885 }
886 diff = q * den - num;
887 if (diff < 0)
888 diff = -diff;
889 if (best_num == 0 ||
890 diff * best_den < best_diff * den) {
891 best_diff = diff;
892 best_den = den;
893 best_num = num;
894 }
895 }
896 if (best_den == 0) {
897 i->empty = 1;
898 return -EINVAL;
899 }
900 t.max = div_up(best_num, best_den);
901 t.openmax = !!(best_num % best_den);
902 t.integer = 0;
903 err = snd_interval_refine(i, &t);
904 if (err < 0)
905 return err;
906
907 if (snd_interval_single(i)) {
908 if (best_diff * result_den < result_diff * best_den) {
909 result_num = best_num;
910 result_den = best_den;
911 }
912 if (nump)
913 *nump = result_num;
914 if (denp)
915 *denp = result_den;
916 }
917 return err;
918}
919
920EXPORT_SYMBOL(snd_interval_ratnum);
921
922/**
923 * snd_interval_ratden - refine the interval value
924 * @i: interval to refine
925 * @rats_count: number of struct ratden
926 * @rats: struct ratden array
927 * @nump: pointer to store the resultant numerator
928 * @denp: pointer to store the resultant denominator
929 *
930 * Returns non-zero if the value is changed, zero if not changed.
931 */
932static int snd_interval_ratden(struct snd_interval *i,
933 unsigned int rats_count, struct snd_ratden *rats,
934 unsigned int *nump, unsigned int *denp)
935{
936 unsigned int best_num, best_diff, best_den;
937 unsigned int k;
938 struct snd_interval t;
939 int err;
940
941 best_num = best_den = best_diff = 0;
942 for (k = 0; k < rats_count; ++k) {
943 unsigned int num;
944 unsigned int den = rats[k].den;
945 unsigned int q = i->min;
946 int diff;
947 num = mul(q, den);
948 if (num > rats[k].num_max)
949 continue;
950 if (num < rats[k].num_min)
951 num = rats[k].num_max;
952 else {
953 unsigned int r;
954 r = (num - rats[k].num_min) % rats[k].num_step;
955 if (r != 0)
956 num += rats[k].num_step - r;
957 }
958 diff = num - q * den;
959 if (best_num == 0 ||
960 diff * best_den < best_diff * den) {
961 best_diff = diff;
962 best_den = den;
963 best_num = num;
964 }
965 }
966 if (best_den == 0) {
967 i->empty = 1;
968 return -EINVAL;
969 }
970 t.min = div_down(best_num, best_den);
971 t.openmin = !!(best_num % best_den);
972
973 best_num = best_den = best_diff = 0;
974 for (k = 0; k < rats_count; ++k) {
975 unsigned int num;
976 unsigned int den = rats[k].den;
977 unsigned int q = i->max;
978 int diff;
979 num = mul(q, den);
980 if (num < rats[k].num_min)
981 continue;
982 if (num > rats[k].num_max)
983 num = rats[k].num_max;
984 else {
985 unsigned int r;
986 r = (num - rats[k].num_min) % rats[k].num_step;
987 if (r != 0)
988 num -= r;
989 }
990 diff = q * den - num;
991 if (best_num == 0 ||
992 diff * best_den < best_diff * den) {
993 best_diff = diff;
994 best_den = den;
995 best_num = num;
996 }
997 }
998 if (best_den == 0) {
999 i->empty = 1;
1000 return -EINVAL;
1001 }
1002 t.max = div_up(best_num, best_den);
1003 t.openmax = !!(best_num % best_den);
1004 t.integer = 0;
1005 err = snd_interval_refine(i, &t);
1006 if (err < 0)
1007 return err;
1008
1009 if (snd_interval_single(i)) {
1010 if (nump)
1011 *nump = best_num;
1012 if (denp)
1013 *denp = best_den;
1014 }
1015 return err;
1016}
1017
1018/**
1019 * snd_interval_list - refine the interval value from the list
1020 * @i: the interval value to refine
1021 * @count: the number of elements in the list
1022 * @list: the value list
1023 * @mask: the bit-mask to evaluate
1024 *
1025 * Refines the interval value from the list.
1026 * When mask is non-zero, only the elements corresponding to bit 1 are
1027 * evaluated.
1028 *
1029 * Returns non-zero if the value is changed, zero if not changed.
1030 */
1031int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
1032{
1033 unsigned int k;
1034 struct snd_interval list_range;
1035
1036 if (!count) {
1037 i->empty = 1;
1038 return -EINVAL;
1039 }
1040 snd_interval_any(&list_range);
1041 list_range.min = UINT_MAX;
1042 list_range.max = 0;
1043 for (k = 0; k < count; k++) {
1044 if (mask && !(mask & (1 << k)))
1045 continue;
1046 if (!snd_interval_test(i, list[k]))
1047 continue;
1048 list_range.min = min(list_range.min, list[k]);
1049 list_range.max = max(list_range.max, list[k]);
1050 }
1051 return snd_interval_refine(i, &list_range);
1052}
1053
1054EXPORT_SYMBOL(snd_interval_list);
1055
1056static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1057{
1058 unsigned int n;
1059 int changed = 0;
1060 n = (i->min - min) % step;
1061 if (n != 0 || i->openmin) {
1062 i->min += step - n;
1063 changed = 1;
1064 }
1065 n = (i->max - min) % step;
1066 if (n != 0 || i->openmax) {
1067 i->max -= n;
1068 changed = 1;
1069 }
1070 if (snd_interval_checkempty(i)) {
1071 i->empty = 1;
1072 return -EINVAL;
1073 }
1074 return changed;
1075}
1076
1077/* Info constraints helpers */
1078
1079/**
1080 * snd_pcm_hw_rule_add - add the hw-constraint rule
1081 * @runtime: the pcm runtime instance
1082 * @cond: condition bits
1083 * @var: the variable to evaluate
1084 * @func: the evaluation function
1085 * @private: the private data pointer passed to function
1086 * @dep: the dependent variables
1087 *
1088 * Returns zero if successful, or a negative error code on failure.
1089 */
1090int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1091 int var,
1092 snd_pcm_hw_rule_func_t func, void *private,
1093 int dep, ...)
1094{
1095 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1096 struct snd_pcm_hw_rule *c;
1097 unsigned int k;
1098 va_list args;
1099 va_start(args, dep);
1100 if (constrs->rules_num >= constrs->rules_all) {
1101 struct snd_pcm_hw_rule *new;
1102 unsigned int new_rules = constrs->rules_all + 16;
1103 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1104 if (!new) {
1105 va_end(args);
1106 return -ENOMEM;
1107 }
1108 if (constrs->rules) {
1109 memcpy(new, constrs->rules,
1110 constrs->rules_num * sizeof(*c));
1111 kfree(constrs->rules);
1112 }
1113 constrs->rules = new;
1114 constrs->rules_all = new_rules;
1115 }
1116 c = &constrs->rules[constrs->rules_num];
1117 c->cond = cond;
1118 c->func = func;
1119 c->var = var;
1120 c->private = private;
1121 k = 0;
1122 while (1) {
1123 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1124 va_end(args);
1125 return -EINVAL;
1126 }
1127 c->deps[k++] = dep;
1128 if (dep < 0)
1129 break;
1130 dep = va_arg(args, int);
1131 }
1132 constrs->rules_num++;
1133 va_end(args);
1134 return 0;
1135}
1136
1137EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1138
1139/**
1140 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1141 * @runtime: PCM runtime instance
1142 * @var: hw_params variable to apply the mask
1143 * @mask: the bitmap mask
1144 *
1145 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1146 */
1147int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1148 u_int32_t mask)
1149{
1150 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1151 struct snd_mask *maskp = constrs_mask(constrs, var);
1152 *maskp->bits &= mask;
1153 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1154 if (*maskp->bits == 0)
1155 return -EINVAL;
1156 return 0;
1157}
1158
1159/**
1160 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1161 * @runtime: PCM runtime instance
1162 * @var: hw_params variable to apply the mask
1163 * @mask: the 64bit bitmap mask
1164 *
1165 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1166 */
1167int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1168 u_int64_t mask)
1169{
1170 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1171 struct snd_mask *maskp = constrs_mask(constrs, var);
1172 maskp->bits[0] &= (u_int32_t)mask;
1173 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1174 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1175 if (! maskp->bits[0] && ! maskp->bits[1])
1176 return -EINVAL;
1177 return 0;
1178}
1179
1180/**
1181 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1182 * @runtime: PCM runtime instance
1183 * @var: hw_params variable to apply the integer constraint
1184 *
1185 * Apply the constraint of integer to an interval parameter.
1186 */
1187int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1188{
1189 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1190 return snd_interval_setinteger(constrs_interval(constrs, var));
1191}
1192
1193EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1194
1195/**
1196 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1197 * @runtime: PCM runtime instance
1198 * @var: hw_params variable to apply the range
1199 * @min: the minimal value
1200 * @max: the maximal value
1201 *
1202 * Apply the min/max range constraint to an interval parameter.
1203 */
1204int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1205 unsigned int min, unsigned int max)
1206{
1207 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1208 struct snd_interval t;
1209 t.min = min;
1210 t.max = max;
1211 t.openmin = t.openmax = 0;
1212 t.integer = 0;
1213 return snd_interval_refine(constrs_interval(constrs, var), &t);
1214}
1215
1216EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1217
1218static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1219 struct snd_pcm_hw_rule *rule)
1220{
1221 struct snd_pcm_hw_constraint_list *list = rule->private;
1222 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1223}
1224
1225
1226/**
1227 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1228 * @runtime: PCM runtime instance
1229 * @cond: condition bits
1230 * @var: hw_params variable to apply the list constraint
1231 * @l: list
1232 *
1233 * Apply the list of constraints to an interval parameter.
1234 */
1235int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1236 unsigned int cond,
1237 snd_pcm_hw_param_t var,
1238 struct snd_pcm_hw_constraint_list *l)
1239{
1240 return snd_pcm_hw_rule_add(runtime, cond, var,
1241 snd_pcm_hw_rule_list, l,
1242 var, -1);
1243}
1244
1245EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1246
1247static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1248 struct snd_pcm_hw_rule *rule)
1249{
1250 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1251 unsigned int num = 0, den = 0;
1252 int err;
1253 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1254 r->nrats, r->rats, &num, &den);
1255 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1256 params->rate_num = num;
1257 params->rate_den = den;
1258 }
1259 return err;
1260}
1261
1262/**
1263 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1264 * @runtime: PCM runtime instance
1265 * @cond: condition bits
1266 * @var: hw_params variable to apply the ratnums constraint
1267 * @r: struct snd_ratnums constriants
1268 */
1269int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1270 unsigned int cond,
1271 snd_pcm_hw_param_t var,
1272 struct snd_pcm_hw_constraint_ratnums *r)
1273{
1274 return snd_pcm_hw_rule_add(runtime, cond, var,
1275 snd_pcm_hw_rule_ratnums, r,
1276 var, -1);
1277}
1278
1279EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1280
1281static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1282 struct snd_pcm_hw_rule *rule)
1283{
1284 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1285 unsigned int num = 0, den = 0;
1286 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1287 r->nrats, r->rats, &num, &den);
1288 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1289 params->rate_num = num;
1290 params->rate_den = den;
1291 }
1292 return err;
1293}
1294
1295/**
1296 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1297 * @runtime: PCM runtime instance
1298 * @cond: condition bits
1299 * @var: hw_params variable to apply the ratdens constraint
1300 * @r: struct snd_ratdens constriants
1301 */
1302int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1303 unsigned int cond,
1304 snd_pcm_hw_param_t var,
1305 struct snd_pcm_hw_constraint_ratdens *r)
1306{
1307 return snd_pcm_hw_rule_add(runtime, cond, var,
1308 snd_pcm_hw_rule_ratdens, r,
1309 var, -1);
1310}
1311
1312EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1313
1314static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1315 struct snd_pcm_hw_rule *rule)
1316{
1317 unsigned int l = (unsigned long) rule->private;
1318 int width = l & 0xffff;
1319 unsigned int msbits = l >> 16;
1320 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1321 if (snd_interval_single(i) && snd_interval_value(i) == width)
1322 params->msbits = msbits;
1323 return 0;
1324}
1325
1326/**
1327 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1328 * @runtime: PCM runtime instance
1329 * @cond: condition bits
1330 * @width: sample bits width
1331 * @msbits: msbits width
1332 */
1333int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1334 unsigned int cond,
1335 unsigned int width,
1336 unsigned int msbits)
1337{
1338 unsigned long l = (msbits << 16) | width;
1339 return snd_pcm_hw_rule_add(runtime, cond, -1,
1340 snd_pcm_hw_rule_msbits,
1341 (void*) l,
1342 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1343}
1344
1345EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1346
1347static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1348 struct snd_pcm_hw_rule *rule)
1349{
1350 unsigned long step = (unsigned long) rule->private;
1351 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1352}
1353
1354/**
1355 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1356 * @runtime: PCM runtime instance
1357 * @cond: condition bits
1358 * @var: hw_params variable to apply the step constraint
1359 * @step: step size
1360 */
1361int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1362 unsigned int cond,
1363 snd_pcm_hw_param_t var,
1364 unsigned long step)
1365{
1366 return snd_pcm_hw_rule_add(runtime, cond, var,
1367 snd_pcm_hw_rule_step, (void *) step,
1368 var, -1);
1369}
1370
1371EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1372
1373static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1374{
1375 static unsigned int pow2_sizes[] = {
1376 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1377 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1378 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1379 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1380 };
1381 return snd_interval_list(hw_param_interval(params, rule->var),
1382 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1383}
1384
1385/**
1386 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1387 * @runtime: PCM runtime instance
1388 * @cond: condition bits
1389 * @var: hw_params variable to apply the power-of-2 constraint
1390 */
1391int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1392 unsigned int cond,
1393 snd_pcm_hw_param_t var)
1394{
1395 return snd_pcm_hw_rule_add(runtime, cond, var,
1396 snd_pcm_hw_rule_pow2, NULL,
1397 var, -1);
1398}
1399
1400EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1401
1402static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1403 snd_pcm_hw_param_t var)
1404{
1405 if (hw_is_mask(var)) {
1406 snd_mask_any(hw_param_mask(params, var));
1407 params->cmask |= 1 << var;
1408 params->rmask |= 1 << var;
1409 return;
1410 }
1411 if (hw_is_interval(var)) {
1412 snd_interval_any(hw_param_interval(params, var));
1413 params->cmask |= 1 << var;
1414 params->rmask |= 1 << var;
1415 return;
1416 }
1417 snd_BUG();
1418}
1419
1420void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1421{
1422 unsigned int k;
1423 memset(params, 0, sizeof(*params));
1424 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1425 _snd_pcm_hw_param_any(params, k);
1426 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1427 _snd_pcm_hw_param_any(params, k);
1428 params->info = ~0U;
1429}
1430
1431EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1432
1433/**
1434 * snd_pcm_hw_param_value - return @params field @var value
1435 * @params: the hw_params instance
1436 * @var: parameter to retrieve
1437 * @dir: pointer to the direction (-1,0,1) or %NULL
1438 *
1439 * Return the value for field @var if it's fixed in configuration space
1440 * defined by @params. Return -%EINVAL otherwise.
1441 */
1442int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1443 snd_pcm_hw_param_t var, int *dir)
1444{
1445 if (hw_is_mask(var)) {
1446 const struct snd_mask *mask = hw_param_mask_c(params, var);
1447 if (!snd_mask_single(mask))
1448 return -EINVAL;
1449 if (dir)
1450 *dir = 0;
1451 return snd_mask_value(mask);
1452 }
1453 if (hw_is_interval(var)) {
1454 const struct snd_interval *i = hw_param_interval_c(params, var);
1455 if (!snd_interval_single(i))
1456 return -EINVAL;
1457 if (dir)
1458 *dir = i->openmin;
1459 return snd_interval_value(i);
1460 }
1461 return -EINVAL;
1462}
1463
1464EXPORT_SYMBOL(snd_pcm_hw_param_value);
1465
1466void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1467 snd_pcm_hw_param_t var)
1468{
1469 if (hw_is_mask(var)) {
1470 snd_mask_none(hw_param_mask(params, var));
1471 params->cmask |= 1 << var;
1472 params->rmask |= 1 << var;
1473 } else if (hw_is_interval(var)) {
1474 snd_interval_none(hw_param_interval(params, var));
1475 params->cmask |= 1 << var;
1476 params->rmask |= 1 << var;
1477 } else {
1478 snd_BUG();
1479 }
1480}
1481
1482EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1483
1484static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1485 snd_pcm_hw_param_t var)
1486{
1487 int changed;
1488 if (hw_is_mask(var))
1489 changed = snd_mask_refine_first(hw_param_mask(params, var));
1490 else if (hw_is_interval(var))
1491 changed = snd_interval_refine_first(hw_param_interval(params, var));
1492 else
1493 return -EINVAL;
1494 if (changed) {
1495 params->cmask |= 1 << var;
1496 params->rmask |= 1 << var;
1497 }
1498 return changed;
1499}
1500
1501
1502/**
1503 * snd_pcm_hw_param_first - refine config space and return minimum value
1504 * @pcm: PCM instance
1505 * @params: the hw_params instance
1506 * @var: parameter to retrieve
1507 * @dir: pointer to the direction (-1,0,1) or %NULL
1508 *
1509 * Inside configuration space defined by @params remove from @var all
1510 * values > minimum. Reduce configuration space accordingly.
1511 * Return the minimum.
1512 */
1513int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1514 struct snd_pcm_hw_params *params,
1515 snd_pcm_hw_param_t var, int *dir)
1516{
1517 int changed = _snd_pcm_hw_param_first(params, var);
1518 if (changed < 0)
1519 return changed;
1520 if (params->rmask) {
1521 int err = snd_pcm_hw_refine(pcm, params);
1522 if (snd_BUG_ON(err < 0))
1523 return err;
1524 }
1525 return snd_pcm_hw_param_value(params, var, dir);
1526}
1527
1528EXPORT_SYMBOL(snd_pcm_hw_param_first);
1529
1530static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1531 snd_pcm_hw_param_t var)
1532{
1533 int changed;
1534 if (hw_is_mask(var))
1535 changed = snd_mask_refine_last(hw_param_mask(params, var));
1536 else if (hw_is_interval(var))
1537 changed = snd_interval_refine_last(hw_param_interval(params, var));
1538 else
1539 return -EINVAL;
1540 if (changed) {
1541 params->cmask |= 1 << var;
1542 params->rmask |= 1 << var;
1543 }
1544 return changed;
1545}
1546
1547
1548/**
1549 * snd_pcm_hw_param_last - refine config space and return maximum value
1550 * @pcm: PCM instance
1551 * @params: the hw_params instance
1552 * @var: parameter to retrieve
1553 * @dir: pointer to the direction (-1,0,1) or %NULL
1554 *
1555 * Inside configuration space defined by @params remove from @var all
1556 * values < maximum. Reduce configuration space accordingly.
1557 * Return the maximum.
1558 */
1559int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1560 struct snd_pcm_hw_params *params,
1561 snd_pcm_hw_param_t var, int *dir)
1562{
1563 int changed = _snd_pcm_hw_param_last(params, var);
1564 if (changed < 0)
1565 return changed;
1566 if (params->rmask) {
1567 int err = snd_pcm_hw_refine(pcm, params);
1568 if (snd_BUG_ON(err < 0))
1569 return err;
1570 }
1571 return snd_pcm_hw_param_value(params, var, dir);
1572}
1573
1574EXPORT_SYMBOL(snd_pcm_hw_param_last);
1575
1576/**
1577 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1578 * @pcm: PCM instance
1579 * @params: the hw_params instance
1580 *
1581 * Choose one configuration from configuration space defined by @params.
1582 * The configuration chosen is that obtained fixing in this order:
1583 * first access, first format, first subformat, min channels,
1584 * min rate, min period time, max buffer size, min tick time
1585 */
1586int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1587 struct snd_pcm_hw_params *params)
1588{
1589 static int vars[] = {
1590 SNDRV_PCM_HW_PARAM_ACCESS,
1591 SNDRV_PCM_HW_PARAM_FORMAT,
1592 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1593 SNDRV_PCM_HW_PARAM_CHANNELS,
1594 SNDRV_PCM_HW_PARAM_RATE,
1595 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1596 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1597 SNDRV_PCM_HW_PARAM_TICK_TIME,
1598 -1
1599 };
1600 int err, *v;
1601
1602 for (v = vars; *v != -1; v++) {
1603 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1604 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1605 else
1606 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1607 if (snd_BUG_ON(err < 0))
1608 return err;
1609 }
1610 return 0;
1611}
1612
1613static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1614 void *arg)
1615{
1616 struct snd_pcm_runtime *runtime = substream->runtime;
1617 unsigned long flags;
1618 snd_pcm_stream_lock_irqsave(substream, flags);
1619 if (snd_pcm_running(substream) &&
1620 snd_pcm_update_hw_ptr(substream) >= 0)
1621 runtime->status->hw_ptr %= runtime->buffer_size;
1622 else
1623 runtime->status->hw_ptr = 0;
1624 snd_pcm_stream_unlock_irqrestore(substream, flags);
1625 return 0;
1626}
1627
1628static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1629 void *arg)
1630{
1631 struct snd_pcm_channel_info *info = arg;
1632 struct snd_pcm_runtime *runtime = substream->runtime;
1633 int width;
1634 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1635 info->offset = -1;
1636 return 0;
1637 }
1638 width = snd_pcm_format_physical_width(runtime->format);
1639 if (width < 0)
1640 return width;
1641 info->offset = 0;
1642 switch (runtime->access) {
1643 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1644 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1645 info->first = info->channel * width;
1646 info->step = runtime->channels * width;
1647 break;
1648 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1649 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1650 {
1651 size_t size = runtime->dma_bytes / runtime->channels;
1652 info->first = info->channel * size * 8;
1653 info->step = width;
1654 break;
1655 }
1656 default:
1657 snd_BUG();
1658 break;
1659 }
1660 return 0;
1661}
1662
1663static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1664 void *arg)
1665{
1666 struct snd_pcm_hw_params *params = arg;
1667 snd_pcm_format_t format;
1668 int channels, width;
1669
1670 params->fifo_size = substream->runtime->hw.fifo_size;
1671 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1672 format = params_format(params);
1673 channels = params_channels(params);
1674 width = snd_pcm_format_physical_width(format);
1675 params->fifo_size /= width * channels;
1676 }
1677 return 0;
1678}
1679
1680/**
1681 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1682 * @substream: the pcm substream instance
1683 * @cmd: ioctl command
1684 * @arg: ioctl argument
1685 *
1686 * Processes the generic ioctl commands for PCM.
1687 * Can be passed as the ioctl callback for PCM ops.
1688 *
1689 * Returns zero if successful, or a negative error code on failure.
1690 */
1691int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1692 unsigned int cmd, void *arg)
1693{
1694 switch (cmd) {
1695 case SNDRV_PCM_IOCTL1_INFO:
1696 return 0;
1697 case SNDRV_PCM_IOCTL1_RESET:
1698 return snd_pcm_lib_ioctl_reset(substream, arg);
1699 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1700 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1701 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1702 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1703 }
1704 return -ENXIO;
1705}
1706
1707EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1708
1709/**
1710 * snd_pcm_period_elapsed - update the pcm status for the next period
1711 * @substream: the pcm substream instance
1712 *
1713 * This function is called from the interrupt handler when the
1714 * PCM has processed the period size. It will update the current
1715 * pointer, wake up sleepers, etc.
1716 *
1717 * Even if more than one periods have elapsed since the last call, you
1718 * have to call this only once.
1719 */
1720void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1721{
1722 struct snd_pcm_runtime *runtime;
1723 unsigned long flags;
1724
1725 if (PCM_RUNTIME_CHECK(substream))
1726 return;
1727 runtime = substream->runtime;
1728
1729 if (runtime->transfer_ack_begin)
1730 runtime->transfer_ack_begin(substream);
1731
1732 snd_pcm_stream_lock_irqsave(substream, flags);
1733 if (!snd_pcm_running(substream) ||
1734 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1735 goto _end;
1736
1737 if (substream->timer_running)
1738 snd_timer_interrupt(substream->timer, 1);
1739 _end:
1740 snd_pcm_stream_unlock_irqrestore(substream, flags);
1741 if (runtime->transfer_ack_end)
1742 runtime->transfer_ack_end(substream);
1743 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1744}
1745
1746EXPORT_SYMBOL(snd_pcm_period_elapsed);
1747
1748/*
1749 * Wait until avail_min data becomes available
1750 * Returns a negative error code if any error occurs during operation.
1751 * The available space is stored on availp. When err = 0 and avail = 0
1752 * on the capture stream, it indicates the stream is in DRAINING state.
1753 */
1754static int wait_for_avail(struct snd_pcm_substream *substream,
1755 snd_pcm_uframes_t *availp)
1756{
1757 struct snd_pcm_runtime *runtime = substream->runtime;
1758 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1759 wait_queue_t wait;
1760 int err = 0;
1761 snd_pcm_uframes_t avail = 0;
1762 long wait_time, tout;
1763
1764 init_waitqueue_entry(&wait, current);
1765 set_current_state(TASK_INTERRUPTIBLE);
1766 add_wait_queue(&runtime->tsleep, &wait);
1767
1768 if (runtime->no_period_wakeup)
1769 wait_time = MAX_SCHEDULE_TIMEOUT;
1770 else {
1771 wait_time = 10;
1772 if (runtime->rate) {
1773 long t = runtime->period_size * 2 / runtime->rate;
1774 wait_time = max(t, wait_time);
1775 }
1776 wait_time = msecs_to_jiffies(wait_time * 1000);
1777 }
1778
1779 for (;;) {
1780 if (signal_pending(current)) {
1781 err = -ERESTARTSYS;
1782 break;
1783 }
1784
1785 /*
1786 * We need to check if space became available already
1787 * (and thus the wakeup happened already) first to close
1788 * the race of space already having become available.
1789 * This check must happen after been added to the waitqueue
1790 * and having current state be INTERRUPTIBLE.
1791 */
1792 if (is_playback)
1793 avail = snd_pcm_playback_avail(runtime);
1794 else
1795 avail = snd_pcm_capture_avail(runtime);
1796 if (avail >= runtime->twake)
1797 break;
1798 snd_pcm_stream_unlock_irq(substream);
1799
1800 tout = schedule_timeout(wait_time);
1801
1802 snd_pcm_stream_lock_irq(substream);
1803 set_current_state(TASK_INTERRUPTIBLE);
1804 switch (runtime->status->state) {
1805 case SNDRV_PCM_STATE_SUSPENDED:
1806 err = -ESTRPIPE;
1807 goto _endloop;
1808 case SNDRV_PCM_STATE_XRUN:
1809 err = -EPIPE;
1810 goto _endloop;
1811 case SNDRV_PCM_STATE_DRAINING:
1812 if (is_playback)
1813 err = -EPIPE;
1814 else
1815 avail = 0; /* indicate draining */
1816 goto _endloop;
1817 case SNDRV_PCM_STATE_OPEN:
1818 case SNDRV_PCM_STATE_SETUP:
1819 case SNDRV_PCM_STATE_DISCONNECTED:
1820 err = -EBADFD;
1821 goto _endloop;
1822 }
1823 if (!tout) {
1824 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1825 is_playback ? "playback" : "capture");
1826 err = -EIO;
1827 break;
1828 }
1829 }
1830 _endloop:
1831 set_current_state(TASK_RUNNING);
1832 remove_wait_queue(&runtime->tsleep, &wait);
1833 *availp = avail;
1834 return err;
1835}
1836
1837static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1838 unsigned int hwoff,
1839 unsigned long data, unsigned int off,
1840 snd_pcm_uframes_t frames)
1841{
1842 struct snd_pcm_runtime *runtime = substream->runtime;
1843 int err;
1844 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1845 if (substream->ops->copy) {
1846 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1847 return err;
1848 } else {
1849 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1850 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1851 return -EFAULT;
1852 }
1853 return 0;
1854}
1855
1856typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1857 unsigned long data, unsigned int off,
1858 snd_pcm_uframes_t size);
1859
1860static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1861 unsigned long data,
1862 snd_pcm_uframes_t size,
1863 int nonblock,
1864 transfer_f transfer)
1865{
1866 struct snd_pcm_runtime *runtime = substream->runtime;
1867 snd_pcm_uframes_t xfer = 0;
1868 snd_pcm_uframes_t offset = 0;
1869 int err = 0;
1870
1871 if (size == 0)
1872 return 0;
1873
1874 snd_pcm_stream_lock_irq(substream);
1875 switch (runtime->status->state) {
1876 case SNDRV_PCM_STATE_PREPARED:
1877 case SNDRV_PCM_STATE_RUNNING:
1878 case SNDRV_PCM_STATE_PAUSED:
1879 break;
1880 case SNDRV_PCM_STATE_XRUN:
1881 err = -EPIPE;
1882 goto _end_unlock;
1883 case SNDRV_PCM_STATE_SUSPENDED:
1884 err = -ESTRPIPE;
1885 goto _end_unlock;
1886 default:
1887 err = -EBADFD;
1888 goto _end_unlock;
1889 }
1890
1891 runtime->twake = runtime->control->avail_min ? : 1;
1892 while (size > 0) {
1893 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1894 snd_pcm_uframes_t avail;
1895 snd_pcm_uframes_t cont;
1896 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1897 snd_pcm_update_hw_ptr(substream);
1898 avail = snd_pcm_playback_avail(runtime);
1899 if (!avail) {
1900 if (nonblock) {
1901 err = -EAGAIN;
1902 goto _end_unlock;
1903 }
1904 runtime->twake = min_t(snd_pcm_uframes_t, size,
1905 runtime->control->avail_min ? : 1);
1906 err = wait_for_avail(substream, &avail);
1907 if (err < 0)
1908 goto _end_unlock;
1909 }
1910 frames = size > avail ? avail : size;
1911 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1912 if (frames > cont)
1913 frames = cont;
1914 if (snd_BUG_ON(!frames)) {
1915 runtime->twake = 0;
1916 snd_pcm_stream_unlock_irq(substream);
1917 return -EINVAL;
1918 }
1919 appl_ptr = runtime->control->appl_ptr;
1920 appl_ofs = appl_ptr % runtime->buffer_size;
1921 snd_pcm_stream_unlock_irq(substream);
1922 err = transfer(substream, appl_ofs, data, offset, frames);
1923 snd_pcm_stream_lock_irq(substream);
1924 if (err < 0)
1925 goto _end_unlock;
1926 switch (runtime->status->state) {
1927 case SNDRV_PCM_STATE_XRUN:
1928 err = -EPIPE;
1929 goto _end_unlock;
1930 case SNDRV_PCM_STATE_SUSPENDED:
1931 err = -ESTRPIPE;
1932 goto _end_unlock;
1933 default:
1934 break;
1935 }
1936 appl_ptr += frames;
1937 if (appl_ptr >= runtime->boundary)
1938 appl_ptr -= runtime->boundary;
1939 runtime->control->appl_ptr = appl_ptr;
1940 if (substream->ops->ack)
1941 substream->ops->ack(substream);
1942
1943 offset += frames;
1944 size -= frames;
1945 xfer += frames;
1946 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1947 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1948 err = snd_pcm_start(substream);
1949 if (err < 0)
1950 goto _end_unlock;
1951 }
1952 }
1953 _end_unlock:
1954 runtime->twake = 0;
1955 if (xfer > 0 && err >= 0)
1956 snd_pcm_update_state(substream, runtime);
1957 snd_pcm_stream_unlock_irq(substream);
1958 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1959}
1960
1961/* sanity-check for read/write methods */
1962static int pcm_sanity_check(struct snd_pcm_substream *substream)
1963{
1964 struct snd_pcm_runtime *runtime;
1965 if (PCM_RUNTIME_CHECK(substream))
1966 return -ENXIO;
1967 runtime = substream->runtime;
1968 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1969 return -EINVAL;
1970 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1971 return -EBADFD;
1972 return 0;
1973}
1974
1975snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1976{
1977 struct snd_pcm_runtime *runtime;
1978 int nonblock;
1979 int err;
1980
1981 err = pcm_sanity_check(substream);
1982 if (err < 0)
1983 return err;
1984 runtime = substream->runtime;
1985 nonblock = !!(substream->f_flags & O_NONBLOCK);
1986
1987 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1988 runtime->channels > 1)
1989 return -EINVAL;
1990 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1991 snd_pcm_lib_write_transfer);
1992}
1993
1994EXPORT_SYMBOL(snd_pcm_lib_write);
1995
1996static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1997 unsigned int hwoff,
1998 unsigned long data, unsigned int off,
1999 snd_pcm_uframes_t frames)
2000{
2001 struct snd_pcm_runtime *runtime = substream->runtime;
2002 int err;
2003 void __user **bufs = (void __user **)data;
2004 int channels = runtime->channels;
2005 int c;
2006 if (substream->ops->copy) {
2007 if (snd_BUG_ON(!substream->ops->silence))
2008 return -EINVAL;
2009 for (c = 0; c < channels; ++c, ++bufs) {
2010 if (*bufs == NULL) {
2011 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2012 return err;
2013 } else {
2014 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2015 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2016 return err;
2017 }
2018 }
2019 } else {
2020 /* default transfer behaviour */
2021 size_t dma_csize = runtime->dma_bytes / channels;
2022 for (c = 0; c < channels; ++c, ++bufs) {
2023 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2024 if (*bufs == NULL) {
2025 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2026 } else {
2027 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2028 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2029 return -EFAULT;
2030 }
2031 }
2032 }
2033 return 0;
2034}
2035
2036snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2037 void __user **bufs,
2038 snd_pcm_uframes_t frames)
2039{
2040 struct snd_pcm_runtime *runtime;
2041 int nonblock;
2042 int err;
2043
2044 err = pcm_sanity_check(substream);
2045 if (err < 0)
2046 return err;
2047 runtime = substream->runtime;
2048 nonblock = !!(substream->f_flags & O_NONBLOCK);
2049
2050 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2051 return -EINVAL;
2052 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2053 nonblock, snd_pcm_lib_writev_transfer);
2054}
2055
2056EXPORT_SYMBOL(snd_pcm_lib_writev);
2057
2058static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2059 unsigned int hwoff,
2060 unsigned long data, unsigned int off,
2061 snd_pcm_uframes_t frames)
2062{
2063 struct snd_pcm_runtime *runtime = substream->runtime;
2064 int err;
2065 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2066 if (substream->ops->copy) {
2067 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2068 return err;
2069 } else {
2070 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2071 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2072 return -EFAULT;
2073 }
2074 return 0;
2075}
2076
2077static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2078 unsigned long data,
2079 snd_pcm_uframes_t size,
2080 int nonblock,
2081 transfer_f transfer)
2082{
2083 struct snd_pcm_runtime *runtime = substream->runtime;
2084 snd_pcm_uframes_t xfer = 0;
2085 snd_pcm_uframes_t offset = 0;
2086 int err = 0;
2087
2088 if (size == 0)
2089 return 0;
2090
2091 snd_pcm_stream_lock_irq(substream);
2092 switch (runtime->status->state) {
2093 case SNDRV_PCM_STATE_PREPARED:
2094 if (size >= runtime->start_threshold) {
2095 err = snd_pcm_start(substream);
2096 if (err < 0)
2097 goto _end_unlock;
2098 }
2099 break;
2100 case SNDRV_PCM_STATE_DRAINING:
2101 case SNDRV_PCM_STATE_RUNNING:
2102 case SNDRV_PCM_STATE_PAUSED:
2103 break;
2104 case SNDRV_PCM_STATE_XRUN:
2105 err = -EPIPE;
2106 goto _end_unlock;
2107 case SNDRV_PCM_STATE_SUSPENDED:
2108 err = -ESTRPIPE;
2109 goto _end_unlock;
2110 default:
2111 err = -EBADFD;
2112 goto _end_unlock;
2113 }
2114
2115 runtime->twake = runtime->control->avail_min ? : 1;
2116 while (size > 0) {
2117 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2118 snd_pcm_uframes_t avail;
2119 snd_pcm_uframes_t cont;
2120 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2121 snd_pcm_update_hw_ptr(substream);
2122 avail = snd_pcm_capture_avail(runtime);
2123 if (!avail) {
2124 if (runtime->status->state ==
2125 SNDRV_PCM_STATE_DRAINING) {
2126 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2127 goto _end_unlock;
2128 }
2129 if (nonblock) {
2130 err = -EAGAIN;
2131 goto _end_unlock;
2132 }
2133 runtime->twake = min_t(snd_pcm_uframes_t, size,
2134 runtime->control->avail_min ? : 1);
2135 err = wait_for_avail(substream, &avail);
2136 if (err < 0)
2137 goto _end_unlock;
2138 if (!avail)
2139 continue; /* draining */
2140 }
2141 frames = size > avail ? avail : size;
2142 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2143 if (frames > cont)
2144 frames = cont;
2145 if (snd_BUG_ON(!frames)) {
2146 runtime->twake = 0;
2147 snd_pcm_stream_unlock_irq(substream);
2148 return -EINVAL;
2149 }
2150 appl_ptr = runtime->control->appl_ptr;
2151 appl_ofs = appl_ptr % runtime->buffer_size;
2152 snd_pcm_stream_unlock_irq(substream);
2153 err = transfer(substream, appl_ofs, data, offset, frames);
2154 snd_pcm_stream_lock_irq(substream);
2155 if (err < 0)
2156 goto _end_unlock;
2157 switch (runtime->status->state) {
2158 case SNDRV_PCM_STATE_XRUN:
2159 err = -EPIPE;
2160 goto _end_unlock;
2161 case SNDRV_PCM_STATE_SUSPENDED:
2162 err = -ESTRPIPE;
2163 goto _end_unlock;
2164 default:
2165 break;
2166 }
2167 appl_ptr += frames;
2168 if (appl_ptr >= runtime->boundary)
2169 appl_ptr -= runtime->boundary;
2170 runtime->control->appl_ptr = appl_ptr;
2171 if (substream->ops->ack)
2172 substream->ops->ack(substream);
2173
2174 offset += frames;
2175 size -= frames;
2176 xfer += frames;
2177 }
2178 _end_unlock:
2179 runtime->twake = 0;
2180 if (xfer > 0 && err >= 0)
2181 snd_pcm_update_state(substream, runtime);
2182 snd_pcm_stream_unlock_irq(substream);
2183 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2184}
2185
2186snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2187{
2188 struct snd_pcm_runtime *runtime;
2189 int nonblock;
2190 int err;
2191
2192 err = pcm_sanity_check(substream);
2193 if (err < 0)
2194 return err;
2195 runtime = substream->runtime;
2196 nonblock = !!(substream->f_flags & O_NONBLOCK);
2197 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2198 return -EINVAL;
2199 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2200}
2201
2202EXPORT_SYMBOL(snd_pcm_lib_read);
2203
2204static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2205 unsigned int hwoff,
2206 unsigned long data, unsigned int off,
2207 snd_pcm_uframes_t frames)
2208{
2209 struct snd_pcm_runtime *runtime = substream->runtime;
2210 int err;
2211 void __user **bufs = (void __user **)data;
2212 int channels = runtime->channels;
2213 int c;
2214 if (substream->ops->copy) {
2215 for (c = 0; c < channels; ++c, ++bufs) {
2216 char __user *buf;
2217 if (*bufs == NULL)
2218 continue;
2219 buf = *bufs + samples_to_bytes(runtime, off);
2220 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2221 return err;
2222 }
2223 } else {
2224 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2225 for (c = 0; c < channels; ++c, ++bufs) {
2226 char *hwbuf;
2227 char __user *buf;
2228 if (*bufs == NULL)
2229 continue;
2230
2231 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2232 buf = *bufs + samples_to_bytes(runtime, off);
2233 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2234 return -EFAULT;
2235 }
2236 }
2237 return 0;
2238}
2239
2240snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2241 void __user **bufs,
2242 snd_pcm_uframes_t frames)
2243{
2244 struct snd_pcm_runtime *runtime;
2245 int nonblock;
2246 int err;
2247
2248 err = pcm_sanity_check(substream);
2249 if (err < 0)
2250 return err;
2251 runtime = substream->runtime;
2252 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2253 return -EBADFD;
2254
2255 nonblock = !!(substream->f_flags & O_NONBLOCK);
2256 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2257 return -EINVAL;
2258 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2259}
2260
2261EXPORT_SYMBOL(snd_pcm_lib_readv);