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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 <linux/export.h>
27#include <sound/core.h>
28#include <sound/control.h>
29#include <sound/tlv.h>
30#include <sound/info.h>
31#include <sound/pcm.h>
32#include <sound/pcm_params.h>
33#include <sound/timer.h>
34
35/*
36 * fill ring buffer with silence
37 * runtime->silence_start: starting pointer to silence area
38 * runtime->silence_filled: size filled with silence
39 * runtime->silence_threshold: threshold from application
40 * runtime->silence_size: maximal size from application
41 *
42 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
43 */
44void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
45{
46 struct snd_pcm_runtime *runtime = substream->runtime;
47 snd_pcm_uframes_t frames, ofs, transfer;
48
49 if (runtime->silence_size < runtime->boundary) {
50 snd_pcm_sframes_t noise_dist, n;
51 if (runtime->silence_start != runtime->control->appl_ptr) {
52 n = runtime->control->appl_ptr - runtime->silence_start;
53 if (n < 0)
54 n += runtime->boundary;
55 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
56 runtime->silence_filled -= n;
57 else
58 runtime->silence_filled = 0;
59 runtime->silence_start = runtime->control->appl_ptr;
60 }
61 if (runtime->silence_filled >= runtime->buffer_size)
62 return;
63 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
64 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
65 return;
66 frames = runtime->silence_threshold - noise_dist;
67 if (frames > runtime->silence_size)
68 frames = runtime->silence_size;
69 } else {
70 if (new_hw_ptr == ULONG_MAX) { /* initialization */
71 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
72 if (avail > runtime->buffer_size)
73 avail = runtime->buffer_size;
74 runtime->silence_filled = avail > 0 ? avail : 0;
75 runtime->silence_start = (runtime->status->hw_ptr +
76 runtime->silence_filled) %
77 runtime->boundary;
78 } else {
79 ofs = runtime->status->hw_ptr;
80 frames = new_hw_ptr - ofs;
81 if ((snd_pcm_sframes_t)frames < 0)
82 frames += runtime->boundary;
83 runtime->silence_filled -= frames;
84 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
85 runtime->silence_filled = 0;
86 runtime->silence_start = new_hw_ptr;
87 } else {
88 runtime->silence_start = ofs;
89 }
90 }
91 frames = runtime->buffer_size - runtime->silence_filled;
92 }
93 if (snd_BUG_ON(frames > runtime->buffer_size))
94 return;
95 if (frames == 0)
96 return;
97 ofs = runtime->silence_start % runtime->buffer_size;
98 while (frames > 0) {
99 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
100 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
101 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
102 if (substream->ops->silence) {
103 int err;
104 err = substream->ops->silence(substream, -1, ofs, transfer);
105 snd_BUG_ON(err < 0);
106 } else {
107 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
108 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
109 }
110 } else {
111 unsigned int c;
112 unsigned int channels = runtime->channels;
113 if (substream->ops->silence) {
114 for (c = 0; c < channels; ++c) {
115 int err;
116 err = substream->ops->silence(substream, c, ofs, transfer);
117 snd_BUG_ON(err < 0);
118 }
119 } else {
120 size_t dma_csize = runtime->dma_bytes / channels;
121 for (c = 0; c < channels; ++c) {
122 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
123 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
124 }
125 }
126 }
127 runtime->silence_filled += transfer;
128 frames -= transfer;
129 ofs = 0;
130 }
131}
132
133#ifdef CONFIG_SND_DEBUG
134void snd_pcm_debug_name(struct snd_pcm_substream *substream,
135 char *name, size_t len)
136{
137 snprintf(name, len, "pcmC%dD%d%c:%d",
138 substream->pcm->card->number,
139 substream->pcm->device,
140 substream->stream ? 'c' : 'p',
141 substream->number);
142}
143EXPORT_SYMBOL(snd_pcm_debug_name);
144#endif
145
146#define XRUN_DEBUG_BASIC (1<<0)
147#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
148#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
149#define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
150#define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
151#define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
152#define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
153
154#ifdef CONFIG_SND_PCM_XRUN_DEBUG
155
156#define xrun_debug(substream, mask) \
157 ((substream)->pstr->xrun_debug & (mask))
158#else
159#define xrun_debug(substream, mask) 0
160#endif
161
162#define dump_stack_on_xrun(substream) do { \
163 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
164 dump_stack(); \
165 } while (0)
166
167static void xrun(struct snd_pcm_substream *substream)
168{
169 struct snd_pcm_runtime *runtime = substream->runtime;
170
171 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
172 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
173 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
174 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
175 char name[16];
176 snd_pcm_debug_name(substream, name, sizeof(name));
177 pcm_warn(substream->pcm, "XRUN: %s\n", name);
178 dump_stack_on_xrun(substream);
179 }
180}
181
182#ifdef CONFIG_SND_PCM_XRUN_DEBUG
183#define hw_ptr_error(substream, fmt, args...) \
184 do { \
185 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
186 xrun_log_show(substream); \
187 pr_err_ratelimited("ALSA: PCM: " fmt, ##args); \
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 pr_info("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 unsigned long curr_jiffies;
316 struct timespec curr_tstamp;
317 struct timespec audio_tstamp;
318 int crossed_boundary = 0;
319
320 old_hw_ptr = runtime->status->hw_ptr;
321
322 /*
323 * group pointer, time and jiffies reads to allow for more
324 * accurate correlations/corrections.
325 * The values are stored at the end of this routine after
326 * corrections for hw_ptr position
327 */
328 pos = substream->ops->pointer(substream);
329 curr_jiffies = jiffies;
330 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
331 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
332
333 if ((runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) &&
334 (substream->ops->wall_clock))
335 substream->ops->wall_clock(substream, &audio_tstamp);
336 }
337
338 if (pos == SNDRV_PCM_POS_XRUN) {
339 xrun(substream);
340 return -EPIPE;
341 }
342 if (pos >= runtime->buffer_size) {
343 if (printk_ratelimit()) {
344 char name[16];
345 snd_pcm_debug_name(substream, name, sizeof(name));
346 xrun_log_show(substream);
347 pcm_err(substream->pcm,
348 "BUG: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
349 name, pos, runtime->buffer_size,
350 runtime->period_size);
351 }
352 pos = 0;
353 }
354 pos -= pos % runtime->min_align;
355 if (xrun_debug(substream, XRUN_DEBUG_LOG))
356 xrun_log(substream, pos, in_interrupt);
357 hw_base = runtime->hw_ptr_base;
358 new_hw_ptr = hw_base + pos;
359 if (in_interrupt) {
360 /* we know that one period was processed */
361 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
362 delta = runtime->hw_ptr_interrupt + runtime->period_size;
363 if (delta > new_hw_ptr) {
364 /* check for double acknowledged interrupts */
365 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
366 if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
367 hw_base += runtime->buffer_size;
368 if (hw_base >= runtime->boundary) {
369 hw_base = 0;
370 crossed_boundary++;
371 }
372 new_hw_ptr = hw_base + pos;
373 goto __delta;
374 }
375 }
376 }
377 /* new_hw_ptr might be lower than old_hw_ptr in case when */
378 /* pointer crosses the end of the ring buffer */
379 if (new_hw_ptr < old_hw_ptr) {
380 hw_base += runtime->buffer_size;
381 if (hw_base >= runtime->boundary) {
382 hw_base = 0;
383 crossed_boundary++;
384 }
385 new_hw_ptr = hw_base + pos;
386 }
387 __delta:
388 delta = new_hw_ptr - old_hw_ptr;
389 if (delta < 0)
390 delta += runtime->boundary;
391 if (xrun_debug(substream, in_interrupt ?
392 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
393 char name[16];
394 snd_pcm_debug_name(substream, name, sizeof(name));
395 pcm_dbg(substream->pcm,
396 "%s_update: %s: pos=%u/%u/%u, hwptr=%ld/%ld/%ld/%ld\n",
397 in_interrupt ? "period" : "hwptr",
398 name,
399 (unsigned int)pos,
400 (unsigned int)runtime->period_size,
401 (unsigned int)runtime->buffer_size,
402 (unsigned long)delta,
403 (unsigned long)old_hw_ptr,
404 (unsigned long)new_hw_ptr,
405 (unsigned long)runtime->hw_ptr_base);
406 }
407
408 if (runtime->no_period_wakeup) {
409 snd_pcm_sframes_t xrun_threshold;
410 /*
411 * Without regular period interrupts, we have to check
412 * the elapsed time to detect xruns.
413 */
414 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
415 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
416 goto no_delta_check;
417 hdelta = jdelta - delta * HZ / runtime->rate;
418 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
419 while (hdelta > xrun_threshold) {
420 delta += runtime->buffer_size;
421 hw_base += runtime->buffer_size;
422 if (hw_base >= runtime->boundary) {
423 hw_base = 0;
424 crossed_boundary++;
425 }
426 new_hw_ptr = hw_base + pos;
427 hdelta -= runtime->hw_ptr_buffer_jiffies;
428 }
429 goto no_delta_check;
430 }
431
432 /* something must be really wrong */
433 if (delta >= runtime->buffer_size + runtime->period_size) {
434 hw_ptr_error(substream,
435 "Unexpected hw_pointer value %s"
436 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
437 "old_hw_ptr=%ld)\n",
438 in_interrupt ? "[Q] " : "[P]",
439 substream->stream, (long)pos,
440 (long)new_hw_ptr, (long)old_hw_ptr);
441 return 0;
442 }
443
444 /* Do jiffies check only in xrun_debug mode */
445 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
446 goto no_jiffies_check;
447
448 /* Skip the jiffies check for hardwares with BATCH flag.
449 * Such hardware usually just increases the position at each IRQ,
450 * thus it can't give any strange position.
451 */
452 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
453 goto no_jiffies_check;
454 hdelta = delta;
455 if (hdelta < runtime->delay)
456 goto no_jiffies_check;
457 hdelta -= runtime->delay;
458 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
459 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
460 delta = jdelta /
461 (((runtime->period_size * HZ) / runtime->rate)
462 + HZ/100);
463 /* move new_hw_ptr according jiffies not pos variable */
464 new_hw_ptr = old_hw_ptr;
465 hw_base = delta;
466 /* use loop to avoid checks for delta overflows */
467 /* the delta value is small or zero in most cases */
468 while (delta > 0) {
469 new_hw_ptr += runtime->period_size;
470 if (new_hw_ptr >= runtime->boundary) {
471 new_hw_ptr -= runtime->boundary;
472 crossed_boundary--;
473 }
474 delta--;
475 }
476 /* align hw_base to buffer_size */
477 hw_ptr_error(substream,
478 "hw_ptr skipping! %s"
479 "(pos=%ld, delta=%ld, period=%ld, "
480 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
481 in_interrupt ? "[Q] " : "",
482 (long)pos, (long)hdelta,
483 (long)runtime->period_size, jdelta,
484 ((hdelta * HZ) / runtime->rate), hw_base,
485 (unsigned long)old_hw_ptr,
486 (unsigned long)new_hw_ptr);
487 /* reset values to proper state */
488 delta = 0;
489 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
490 }
491 no_jiffies_check:
492 if (delta > runtime->period_size + runtime->period_size / 2) {
493 hw_ptr_error(substream,
494 "Lost interrupts? %s"
495 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
496 "old_hw_ptr=%ld)\n",
497 in_interrupt ? "[Q] " : "",
498 substream->stream, (long)delta,
499 (long)new_hw_ptr,
500 (long)old_hw_ptr);
501 }
502
503 no_delta_check:
504 if (runtime->status->hw_ptr == new_hw_ptr)
505 return 0;
506
507 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
508 runtime->silence_size > 0)
509 snd_pcm_playback_silence(substream, new_hw_ptr);
510
511 if (in_interrupt) {
512 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
513 if (delta < 0)
514 delta += runtime->boundary;
515 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
516 runtime->hw_ptr_interrupt += delta;
517 if (runtime->hw_ptr_interrupt >= runtime->boundary)
518 runtime->hw_ptr_interrupt -= runtime->boundary;
519 }
520 runtime->hw_ptr_base = hw_base;
521 runtime->status->hw_ptr = new_hw_ptr;
522 runtime->hw_ptr_jiffies = curr_jiffies;
523 if (crossed_boundary) {
524 snd_BUG_ON(crossed_boundary != 1);
525 runtime->hw_ptr_wrap += runtime->boundary;
526 }
527 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
528 runtime->status->tstamp = curr_tstamp;
529
530 if (!(runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)) {
531 /*
532 * no wall clock available, provide audio timestamp
533 * derived from pointer position+delay
534 */
535 u64 audio_frames, audio_nsecs;
536
537 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
538 audio_frames = runtime->hw_ptr_wrap
539 + runtime->status->hw_ptr
540 - runtime->delay;
541 else
542 audio_frames = runtime->hw_ptr_wrap
543 + runtime->status->hw_ptr
544 + runtime->delay;
545 audio_nsecs = div_u64(audio_frames * 1000000000LL,
546 runtime->rate);
547 audio_tstamp = ns_to_timespec(audio_nsecs);
548 }
549 runtime->status->audio_tstamp = audio_tstamp;
550 }
551
552 return snd_pcm_update_state(substream, runtime);
553}
554
555/* CAUTION: call it with irq disabled */
556int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
557{
558 return snd_pcm_update_hw_ptr0(substream, 0);
559}
560
561/**
562 * snd_pcm_set_ops - set the PCM operators
563 * @pcm: the pcm instance
564 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
565 * @ops: the operator table
566 *
567 * Sets the given PCM operators to the pcm instance.
568 */
569void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
570 const struct snd_pcm_ops *ops)
571{
572 struct snd_pcm_str *stream = &pcm->streams[direction];
573 struct snd_pcm_substream *substream;
574
575 for (substream = stream->substream; substream != NULL; substream = substream->next)
576 substream->ops = ops;
577}
578
579EXPORT_SYMBOL(snd_pcm_set_ops);
580
581/**
582 * snd_pcm_sync - set the PCM sync id
583 * @substream: the pcm substream
584 *
585 * Sets the PCM sync identifier for the card.
586 */
587void snd_pcm_set_sync(struct snd_pcm_substream *substream)
588{
589 struct snd_pcm_runtime *runtime = substream->runtime;
590
591 runtime->sync.id32[0] = substream->pcm->card->number;
592 runtime->sync.id32[1] = -1;
593 runtime->sync.id32[2] = -1;
594 runtime->sync.id32[3] = -1;
595}
596
597EXPORT_SYMBOL(snd_pcm_set_sync);
598
599/*
600 * Standard ioctl routine
601 */
602
603static inline unsigned int div32(unsigned int a, unsigned int b,
604 unsigned int *r)
605{
606 if (b == 0) {
607 *r = 0;
608 return UINT_MAX;
609 }
610 *r = a % b;
611 return a / b;
612}
613
614static inline unsigned int div_down(unsigned int a, unsigned int b)
615{
616 if (b == 0)
617 return UINT_MAX;
618 return a / b;
619}
620
621static inline unsigned int div_up(unsigned int a, unsigned int b)
622{
623 unsigned int r;
624 unsigned int q;
625 if (b == 0)
626 return UINT_MAX;
627 q = div32(a, b, &r);
628 if (r)
629 ++q;
630 return q;
631}
632
633static inline unsigned int mul(unsigned int a, unsigned int b)
634{
635 if (a == 0)
636 return 0;
637 if (div_down(UINT_MAX, a) < b)
638 return UINT_MAX;
639 return a * b;
640}
641
642static inline unsigned int muldiv32(unsigned int a, unsigned int b,
643 unsigned int c, unsigned int *r)
644{
645 u_int64_t n = (u_int64_t) a * b;
646 if (c == 0) {
647 snd_BUG_ON(!n);
648 *r = 0;
649 return UINT_MAX;
650 }
651 n = div_u64_rem(n, c, r);
652 if (n >= UINT_MAX) {
653 *r = 0;
654 return UINT_MAX;
655 }
656 return n;
657}
658
659/**
660 * snd_interval_refine - refine the interval value of configurator
661 * @i: the interval value to refine
662 * @v: the interval value to refer to
663 *
664 * Refines the interval value with the reference value.
665 * The interval is changed to the range satisfying both intervals.
666 * The interval status (min, max, integer, etc.) are evaluated.
667 *
668 * Return: Positive if the value is changed, zero if it's not changed, or a
669 * negative error code.
670 */
671int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
672{
673 int changed = 0;
674 if (snd_BUG_ON(snd_interval_empty(i)))
675 return -EINVAL;
676 if (i->min < v->min) {
677 i->min = v->min;
678 i->openmin = v->openmin;
679 changed = 1;
680 } else if (i->min == v->min && !i->openmin && v->openmin) {
681 i->openmin = 1;
682 changed = 1;
683 }
684 if (i->max > v->max) {
685 i->max = v->max;
686 i->openmax = v->openmax;
687 changed = 1;
688 } else if (i->max == v->max && !i->openmax && v->openmax) {
689 i->openmax = 1;
690 changed = 1;
691 }
692 if (!i->integer && v->integer) {
693 i->integer = 1;
694 changed = 1;
695 }
696 if (i->integer) {
697 if (i->openmin) {
698 i->min++;
699 i->openmin = 0;
700 }
701 if (i->openmax) {
702 i->max--;
703 i->openmax = 0;
704 }
705 } else if (!i->openmin && !i->openmax && i->min == i->max)
706 i->integer = 1;
707 if (snd_interval_checkempty(i)) {
708 snd_interval_none(i);
709 return -EINVAL;
710 }
711 return changed;
712}
713
714EXPORT_SYMBOL(snd_interval_refine);
715
716static int snd_interval_refine_first(struct snd_interval *i)
717{
718 if (snd_BUG_ON(snd_interval_empty(i)))
719 return -EINVAL;
720 if (snd_interval_single(i))
721 return 0;
722 i->max = i->min;
723 i->openmax = i->openmin;
724 if (i->openmax)
725 i->max++;
726 return 1;
727}
728
729static int snd_interval_refine_last(struct snd_interval *i)
730{
731 if (snd_BUG_ON(snd_interval_empty(i)))
732 return -EINVAL;
733 if (snd_interval_single(i))
734 return 0;
735 i->min = i->max;
736 i->openmin = i->openmax;
737 if (i->openmin)
738 i->min--;
739 return 1;
740}
741
742void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
743{
744 if (a->empty || b->empty) {
745 snd_interval_none(c);
746 return;
747 }
748 c->empty = 0;
749 c->min = mul(a->min, b->min);
750 c->openmin = (a->openmin || b->openmin);
751 c->max = mul(a->max, b->max);
752 c->openmax = (a->openmax || b->openmax);
753 c->integer = (a->integer && b->integer);
754}
755
756/**
757 * snd_interval_div - refine the interval value with division
758 * @a: dividend
759 * @b: divisor
760 * @c: quotient
761 *
762 * c = a / b
763 *
764 * Returns non-zero if the value is changed, zero if not changed.
765 */
766void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
767{
768 unsigned int r;
769 if (a->empty || b->empty) {
770 snd_interval_none(c);
771 return;
772 }
773 c->empty = 0;
774 c->min = div32(a->min, b->max, &r);
775 c->openmin = (r || a->openmin || b->openmax);
776 if (b->min > 0) {
777 c->max = div32(a->max, b->min, &r);
778 if (r) {
779 c->max++;
780 c->openmax = 1;
781 } else
782 c->openmax = (a->openmax || b->openmin);
783 } else {
784 c->max = UINT_MAX;
785 c->openmax = 0;
786 }
787 c->integer = 0;
788}
789
790/**
791 * snd_interval_muldivk - refine the interval value
792 * @a: dividend 1
793 * @b: dividend 2
794 * @k: divisor (as integer)
795 * @c: result
796 *
797 * c = a * b / k
798 *
799 * Returns non-zero if the value is changed, zero if not changed.
800 */
801void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
802 unsigned int k, struct snd_interval *c)
803{
804 unsigned int r;
805 if (a->empty || b->empty) {
806 snd_interval_none(c);
807 return;
808 }
809 c->empty = 0;
810 c->min = muldiv32(a->min, b->min, k, &r);
811 c->openmin = (r || a->openmin || b->openmin);
812 c->max = muldiv32(a->max, b->max, k, &r);
813 if (r) {
814 c->max++;
815 c->openmax = 1;
816 } else
817 c->openmax = (a->openmax || b->openmax);
818 c->integer = 0;
819}
820
821/**
822 * snd_interval_mulkdiv - refine the interval value
823 * @a: dividend 1
824 * @k: dividend 2 (as integer)
825 * @b: divisor
826 * @c: result
827 *
828 * c = a * k / b
829 *
830 * Returns non-zero if the value is changed, zero if not changed.
831 */
832void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
833 const struct snd_interval *b, struct snd_interval *c)
834{
835 unsigned int r;
836 if (a->empty || b->empty) {
837 snd_interval_none(c);
838 return;
839 }
840 c->empty = 0;
841 c->min = muldiv32(a->min, k, b->max, &r);
842 c->openmin = (r || a->openmin || b->openmax);
843 if (b->min > 0) {
844 c->max = muldiv32(a->max, k, b->min, &r);
845 if (r) {
846 c->max++;
847 c->openmax = 1;
848 } else
849 c->openmax = (a->openmax || b->openmin);
850 } else {
851 c->max = UINT_MAX;
852 c->openmax = 0;
853 }
854 c->integer = 0;
855}
856
857/* ---- */
858
859
860/**
861 * snd_interval_ratnum - refine the interval value
862 * @i: interval to refine
863 * @rats_count: number of ratnum_t
864 * @rats: ratnum_t array
865 * @nump: pointer to store the resultant numerator
866 * @denp: pointer to store the resultant denominator
867 *
868 * Return: Positive if the value is changed, zero if it's not changed, or a
869 * negative error code.
870 */
871int snd_interval_ratnum(struct snd_interval *i,
872 unsigned int rats_count, struct snd_ratnum *rats,
873 unsigned int *nump, unsigned int *denp)
874{
875 unsigned int best_num, best_den;
876 int best_diff;
877 unsigned int k;
878 struct snd_interval t;
879 int err;
880 unsigned int result_num, result_den;
881 int result_diff;
882
883 best_num = best_den = best_diff = 0;
884 for (k = 0; k < rats_count; ++k) {
885 unsigned int num = rats[k].num;
886 unsigned int den;
887 unsigned int q = i->min;
888 int diff;
889 if (q == 0)
890 q = 1;
891 den = div_up(num, q);
892 if (den < rats[k].den_min)
893 continue;
894 if (den > rats[k].den_max)
895 den = rats[k].den_max;
896 else {
897 unsigned int r;
898 r = (den - rats[k].den_min) % rats[k].den_step;
899 if (r != 0)
900 den -= r;
901 }
902 diff = num - q * den;
903 if (diff < 0)
904 diff = -diff;
905 if (best_num == 0 ||
906 diff * best_den < best_diff * den) {
907 best_diff = diff;
908 best_den = den;
909 best_num = num;
910 }
911 }
912 if (best_den == 0) {
913 i->empty = 1;
914 return -EINVAL;
915 }
916 t.min = div_down(best_num, best_den);
917 t.openmin = !!(best_num % best_den);
918
919 result_num = best_num;
920 result_diff = best_diff;
921 result_den = best_den;
922 best_num = best_den = best_diff = 0;
923 for (k = 0; k < rats_count; ++k) {
924 unsigned int num = rats[k].num;
925 unsigned int den;
926 unsigned int q = i->max;
927 int diff;
928 if (q == 0) {
929 i->empty = 1;
930 return -EINVAL;
931 }
932 den = div_down(num, q);
933 if (den > rats[k].den_max)
934 continue;
935 if (den < rats[k].den_min)
936 den = rats[k].den_min;
937 else {
938 unsigned int r;
939 r = (den - rats[k].den_min) % rats[k].den_step;
940 if (r != 0)
941 den += rats[k].den_step - r;
942 }
943 diff = q * den - num;
944 if (diff < 0)
945 diff = -diff;
946 if (best_num == 0 ||
947 diff * best_den < best_diff * den) {
948 best_diff = diff;
949 best_den = den;
950 best_num = num;
951 }
952 }
953 if (best_den == 0) {
954 i->empty = 1;
955 return -EINVAL;
956 }
957 t.max = div_up(best_num, best_den);
958 t.openmax = !!(best_num % best_den);
959 t.integer = 0;
960 err = snd_interval_refine(i, &t);
961 if (err < 0)
962 return err;
963
964 if (snd_interval_single(i)) {
965 if (best_diff * result_den < result_diff * best_den) {
966 result_num = best_num;
967 result_den = best_den;
968 }
969 if (nump)
970 *nump = result_num;
971 if (denp)
972 *denp = result_den;
973 }
974 return err;
975}
976
977EXPORT_SYMBOL(snd_interval_ratnum);
978
979/**
980 * snd_interval_ratden - refine the interval value
981 * @i: interval to refine
982 * @rats_count: number of struct ratden
983 * @rats: struct ratden array
984 * @nump: pointer to store the resultant numerator
985 * @denp: pointer to store the resultant denominator
986 *
987 * Return: Positive if the value is changed, zero if it's not changed, or a
988 * negative error code.
989 */
990static int snd_interval_ratden(struct snd_interval *i,
991 unsigned int rats_count, struct snd_ratden *rats,
992 unsigned int *nump, unsigned int *denp)
993{
994 unsigned int best_num, best_diff, best_den;
995 unsigned int k;
996 struct snd_interval t;
997 int err;
998
999 best_num = best_den = best_diff = 0;
1000 for (k = 0; k < rats_count; ++k) {
1001 unsigned int num;
1002 unsigned int den = rats[k].den;
1003 unsigned int q = i->min;
1004 int diff;
1005 num = mul(q, den);
1006 if (num > rats[k].num_max)
1007 continue;
1008 if (num < rats[k].num_min)
1009 num = rats[k].num_max;
1010 else {
1011 unsigned int r;
1012 r = (num - rats[k].num_min) % rats[k].num_step;
1013 if (r != 0)
1014 num += rats[k].num_step - r;
1015 }
1016 diff = num - q * den;
1017 if (best_num == 0 ||
1018 diff * best_den < best_diff * den) {
1019 best_diff = diff;
1020 best_den = den;
1021 best_num = num;
1022 }
1023 }
1024 if (best_den == 0) {
1025 i->empty = 1;
1026 return -EINVAL;
1027 }
1028 t.min = div_down(best_num, best_den);
1029 t.openmin = !!(best_num % best_den);
1030
1031 best_num = best_den = best_diff = 0;
1032 for (k = 0; k < rats_count; ++k) {
1033 unsigned int num;
1034 unsigned int den = rats[k].den;
1035 unsigned int q = i->max;
1036 int diff;
1037 num = mul(q, den);
1038 if (num < rats[k].num_min)
1039 continue;
1040 if (num > rats[k].num_max)
1041 num = rats[k].num_max;
1042 else {
1043 unsigned int r;
1044 r = (num - rats[k].num_min) % rats[k].num_step;
1045 if (r != 0)
1046 num -= r;
1047 }
1048 diff = q * den - num;
1049 if (best_num == 0 ||
1050 diff * best_den < best_diff * den) {
1051 best_diff = diff;
1052 best_den = den;
1053 best_num = num;
1054 }
1055 }
1056 if (best_den == 0) {
1057 i->empty = 1;
1058 return -EINVAL;
1059 }
1060 t.max = div_up(best_num, best_den);
1061 t.openmax = !!(best_num % best_den);
1062 t.integer = 0;
1063 err = snd_interval_refine(i, &t);
1064 if (err < 0)
1065 return err;
1066
1067 if (snd_interval_single(i)) {
1068 if (nump)
1069 *nump = best_num;
1070 if (denp)
1071 *denp = best_den;
1072 }
1073 return err;
1074}
1075
1076/**
1077 * snd_interval_list - refine the interval value from the list
1078 * @i: the interval value to refine
1079 * @count: the number of elements in the list
1080 * @list: the value list
1081 * @mask: the bit-mask to evaluate
1082 *
1083 * Refines the interval value from the list.
1084 * When mask is non-zero, only the elements corresponding to bit 1 are
1085 * evaluated.
1086 *
1087 * Return: Positive if the value is changed, zero if it's not changed, or a
1088 * negative error code.
1089 */
1090int snd_interval_list(struct snd_interval *i, unsigned int count,
1091 const unsigned int *list, unsigned int mask)
1092{
1093 unsigned int k;
1094 struct snd_interval list_range;
1095
1096 if (!count) {
1097 i->empty = 1;
1098 return -EINVAL;
1099 }
1100 snd_interval_any(&list_range);
1101 list_range.min = UINT_MAX;
1102 list_range.max = 0;
1103 for (k = 0; k < count; k++) {
1104 if (mask && !(mask & (1 << k)))
1105 continue;
1106 if (!snd_interval_test(i, list[k]))
1107 continue;
1108 list_range.min = min(list_range.min, list[k]);
1109 list_range.max = max(list_range.max, list[k]);
1110 }
1111 return snd_interval_refine(i, &list_range);
1112}
1113
1114EXPORT_SYMBOL(snd_interval_list);
1115
1116static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1117{
1118 unsigned int n;
1119 int changed = 0;
1120 n = (i->min - min) % step;
1121 if (n != 0 || i->openmin) {
1122 i->min += step - n;
1123 changed = 1;
1124 }
1125 n = (i->max - min) % step;
1126 if (n != 0 || i->openmax) {
1127 i->max -= n;
1128 changed = 1;
1129 }
1130 if (snd_interval_checkempty(i)) {
1131 i->empty = 1;
1132 return -EINVAL;
1133 }
1134 return changed;
1135}
1136
1137/* Info constraints helpers */
1138
1139/**
1140 * snd_pcm_hw_rule_add - add the hw-constraint rule
1141 * @runtime: the pcm runtime instance
1142 * @cond: condition bits
1143 * @var: the variable to evaluate
1144 * @func: the evaluation function
1145 * @private: the private data pointer passed to function
1146 * @dep: the dependent variables
1147 *
1148 * Return: Zero if successful, or a negative error code on failure.
1149 */
1150int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1151 int var,
1152 snd_pcm_hw_rule_func_t func, void *private,
1153 int dep, ...)
1154{
1155 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1156 struct snd_pcm_hw_rule *c;
1157 unsigned int k;
1158 va_list args;
1159 va_start(args, dep);
1160 if (constrs->rules_num >= constrs->rules_all) {
1161 struct snd_pcm_hw_rule *new;
1162 unsigned int new_rules = constrs->rules_all + 16;
1163 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1164 if (!new) {
1165 va_end(args);
1166 return -ENOMEM;
1167 }
1168 if (constrs->rules) {
1169 memcpy(new, constrs->rules,
1170 constrs->rules_num * sizeof(*c));
1171 kfree(constrs->rules);
1172 }
1173 constrs->rules = new;
1174 constrs->rules_all = new_rules;
1175 }
1176 c = &constrs->rules[constrs->rules_num];
1177 c->cond = cond;
1178 c->func = func;
1179 c->var = var;
1180 c->private = private;
1181 k = 0;
1182 while (1) {
1183 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1184 va_end(args);
1185 return -EINVAL;
1186 }
1187 c->deps[k++] = dep;
1188 if (dep < 0)
1189 break;
1190 dep = va_arg(args, int);
1191 }
1192 constrs->rules_num++;
1193 va_end(args);
1194 return 0;
1195}
1196
1197EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1198
1199/**
1200 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1201 * @runtime: PCM runtime instance
1202 * @var: hw_params variable to apply the mask
1203 * @mask: the bitmap mask
1204 *
1205 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1206 *
1207 * Return: Zero if successful, or a negative error code on failure.
1208 */
1209int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1210 u_int32_t mask)
1211{
1212 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1213 struct snd_mask *maskp = constrs_mask(constrs, var);
1214 *maskp->bits &= mask;
1215 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1216 if (*maskp->bits == 0)
1217 return -EINVAL;
1218 return 0;
1219}
1220
1221/**
1222 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1223 * @runtime: PCM runtime instance
1224 * @var: hw_params variable to apply the mask
1225 * @mask: the 64bit bitmap mask
1226 *
1227 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1228 *
1229 * Return: Zero if successful, or a negative error code on failure.
1230 */
1231int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1232 u_int64_t mask)
1233{
1234 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1235 struct snd_mask *maskp = constrs_mask(constrs, var);
1236 maskp->bits[0] &= (u_int32_t)mask;
1237 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1238 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1239 if (! maskp->bits[0] && ! maskp->bits[1])
1240 return -EINVAL;
1241 return 0;
1242}
1243EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1244
1245/**
1246 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1247 * @runtime: PCM runtime instance
1248 * @var: hw_params variable to apply the integer constraint
1249 *
1250 * Apply the constraint of integer to an interval parameter.
1251 *
1252 * Return: Positive if the value is changed, zero if it's not changed, or a
1253 * negative error code.
1254 */
1255int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1256{
1257 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1258 return snd_interval_setinteger(constrs_interval(constrs, var));
1259}
1260
1261EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1262
1263/**
1264 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1265 * @runtime: PCM runtime instance
1266 * @var: hw_params variable to apply the range
1267 * @min: the minimal value
1268 * @max: the maximal value
1269 *
1270 * Apply the min/max range constraint to an interval parameter.
1271 *
1272 * Return: Positive if the value is changed, zero if it's not changed, or a
1273 * negative error code.
1274 */
1275int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1276 unsigned int min, unsigned int max)
1277{
1278 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1279 struct snd_interval t;
1280 t.min = min;
1281 t.max = max;
1282 t.openmin = t.openmax = 0;
1283 t.integer = 0;
1284 return snd_interval_refine(constrs_interval(constrs, var), &t);
1285}
1286
1287EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1288
1289static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1290 struct snd_pcm_hw_rule *rule)
1291{
1292 struct snd_pcm_hw_constraint_list *list = rule->private;
1293 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1294}
1295
1296
1297/**
1298 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1299 * @runtime: PCM runtime instance
1300 * @cond: condition bits
1301 * @var: hw_params variable to apply the list constraint
1302 * @l: list
1303 *
1304 * Apply the list of constraints to an interval parameter.
1305 *
1306 * Return: Zero if successful, or a negative error code on failure.
1307 */
1308int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1309 unsigned int cond,
1310 snd_pcm_hw_param_t var,
1311 const struct snd_pcm_hw_constraint_list *l)
1312{
1313 return snd_pcm_hw_rule_add(runtime, cond, var,
1314 snd_pcm_hw_rule_list, (void *)l,
1315 var, -1);
1316}
1317
1318EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1319
1320static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1321 struct snd_pcm_hw_rule *rule)
1322{
1323 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1324 unsigned int num = 0, den = 0;
1325 int err;
1326 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1327 r->nrats, r->rats, &num, &den);
1328 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1329 params->rate_num = num;
1330 params->rate_den = den;
1331 }
1332 return err;
1333}
1334
1335/**
1336 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1337 * @runtime: PCM runtime instance
1338 * @cond: condition bits
1339 * @var: hw_params variable to apply the ratnums constraint
1340 * @r: struct snd_ratnums constriants
1341 *
1342 * Return: Zero if successful, or a negative error code on failure.
1343 */
1344int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1345 unsigned int cond,
1346 snd_pcm_hw_param_t var,
1347 struct snd_pcm_hw_constraint_ratnums *r)
1348{
1349 return snd_pcm_hw_rule_add(runtime, cond, var,
1350 snd_pcm_hw_rule_ratnums, r,
1351 var, -1);
1352}
1353
1354EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1355
1356static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1357 struct snd_pcm_hw_rule *rule)
1358{
1359 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1360 unsigned int num = 0, den = 0;
1361 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1362 r->nrats, r->rats, &num, &den);
1363 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1364 params->rate_num = num;
1365 params->rate_den = den;
1366 }
1367 return err;
1368}
1369
1370/**
1371 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1372 * @runtime: PCM runtime instance
1373 * @cond: condition bits
1374 * @var: hw_params variable to apply the ratdens constraint
1375 * @r: struct snd_ratdens constriants
1376 *
1377 * Return: Zero if successful, or a negative error code on failure.
1378 */
1379int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1380 unsigned int cond,
1381 snd_pcm_hw_param_t var,
1382 struct snd_pcm_hw_constraint_ratdens *r)
1383{
1384 return snd_pcm_hw_rule_add(runtime, cond, var,
1385 snd_pcm_hw_rule_ratdens, r,
1386 var, -1);
1387}
1388
1389EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1390
1391static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1392 struct snd_pcm_hw_rule *rule)
1393{
1394 unsigned int l = (unsigned long) rule->private;
1395 int width = l & 0xffff;
1396 unsigned int msbits = l >> 16;
1397 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1398 if (snd_interval_single(i) && snd_interval_value(i) == width)
1399 params->msbits = msbits;
1400 return 0;
1401}
1402
1403/**
1404 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1405 * @runtime: PCM runtime instance
1406 * @cond: condition bits
1407 * @width: sample bits width
1408 * @msbits: msbits width
1409 *
1410 * Return: Zero if successful, or a negative error code on failure.
1411 */
1412int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1413 unsigned int cond,
1414 unsigned int width,
1415 unsigned int msbits)
1416{
1417 unsigned long l = (msbits << 16) | width;
1418 return snd_pcm_hw_rule_add(runtime, cond, -1,
1419 snd_pcm_hw_rule_msbits,
1420 (void*) l,
1421 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1422}
1423
1424EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1425
1426static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1427 struct snd_pcm_hw_rule *rule)
1428{
1429 unsigned long step = (unsigned long) rule->private;
1430 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1431}
1432
1433/**
1434 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1435 * @runtime: PCM runtime instance
1436 * @cond: condition bits
1437 * @var: hw_params variable to apply the step constraint
1438 * @step: step size
1439 *
1440 * Return: Zero if successful, or a negative error code on failure.
1441 */
1442int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1443 unsigned int cond,
1444 snd_pcm_hw_param_t var,
1445 unsigned long step)
1446{
1447 return snd_pcm_hw_rule_add(runtime, cond, var,
1448 snd_pcm_hw_rule_step, (void *) step,
1449 var, -1);
1450}
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 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}
1482
1483EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1484
1485static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1486 struct snd_pcm_hw_rule *rule)
1487{
1488 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1489 struct snd_interval *rate;
1490
1491 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1492 return snd_interval_list(rate, 1, &base_rate, 0);
1493}
1494
1495/**
1496 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1497 * @runtime: PCM runtime instance
1498 * @base_rate: the rate at which the hardware does not resample
1499 *
1500 * Return: Zero if successful, or a negative error code on failure.
1501 */
1502int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1503 unsigned int base_rate)
1504{
1505 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1506 SNDRV_PCM_HW_PARAM_RATE,
1507 snd_pcm_hw_rule_noresample_func,
1508 (void *)(uintptr_t)base_rate,
1509 SNDRV_PCM_HW_PARAM_RATE, -1);
1510}
1511EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1512
1513static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1514 snd_pcm_hw_param_t var)
1515{
1516 if (hw_is_mask(var)) {
1517 snd_mask_any(hw_param_mask(params, var));
1518 params->cmask |= 1 << var;
1519 params->rmask |= 1 << var;
1520 return;
1521 }
1522 if (hw_is_interval(var)) {
1523 snd_interval_any(hw_param_interval(params, var));
1524 params->cmask |= 1 << var;
1525 params->rmask |= 1 << var;
1526 return;
1527 }
1528 snd_BUG();
1529}
1530
1531void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1532{
1533 unsigned int k;
1534 memset(params, 0, sizeof(*params));
1535 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1536 _snd_pcm_hw_param_any(params, k);
1537 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1538 _snd_pcm_hw_param_any(params, k);
1539 params->info = ~0U;
1540}
1541
1542EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1543
1544/**
1545 * snd_pcm_hw_param_value - return @params field @var value
1546 * @params: the hw_params instance
1547 * @var: parameter to retrieve
1548 * @dir: pointer to the direction (-1,0,1) or %NULL
1549 *
1550 * Return: The value for field @var if it's fixed in configuration space
1551 * defined by @params. -%EINVAL otherwise.
1552 */
1553int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1554 snd_pcm_hw_param_t var, int *dir)
1555{
1556 if (hw_is_mask(var)) {
1557 const struct snd_mask *mask = hw_param_mask_c(params, var);
1558 if (!snd_mask_single(mask))
1559 return -EINVAL;
1560 if (dir)
1561 *dir = 0;
1562 return snd_mask_value(mask);
1563 }
1564 if (hw_is_interval(var)) {
1565 const struct snd_interval *i = hw_param_interval_c(params, var);
1566 if (!snd_interval_single(i))
1567 return -EINVAL;
1568 if (dir)
1569 *dir = i->openmin;
1570 return snd_interval_value(i);
1571 }
1572 return -EINVAL;
1573}
1574
1575EXPORT_SYMBOL(snd_pcm_hw_param_value);
1576
1577void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1578 snd_pcm_hw_param_t var)
1579{
1580 if (hw_is_mask(var)) {
1581 snd_mask_none(hw_param_mask(params, var));
1582 params->cmask |= 1 << var;
1583 params->rmask |= 1 << var;
1584 } else if (hw_is_interval(var)) {
1585 snd_interval_none(hw_param_interval(params, var));
1586 params->cmask |= 1 << var;
1587 params->rmask |= 1 << var;
1588 } else {
1589 snd_BUG();
1590 }
1591}
1592
1593EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1594
1595static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1596 snd_pcm_hw_param_t var)
1597{
1598 int changed;
1599 if (hw_is_mask(var))
1600 changed = snd_mask_refine_first(hw_param_mask(params, var));
1601 else if (hw_is_interval(var))
1602 changed = snd_interval_refine_first(hw_param_interval(params, var));
1603 else
1604 return -EINVAL;
1605 if (changed) {
1606 params->cmask |= 1 << var;
1607 params->rmask |= 1 << var;
1608 }
1609 return changed;
1610}
1611
1612
1613/**
1614 * snd_pcm_hw_param_first - refine config space and return minimum value
1615 * @pcm: PCM instance
1616 * @params: the hw_params instance
1617 * @var: parameter to retrieve
1618 * @dir: pointer to the direction (-1,0,1) or %NULL
1619 *
1620 * Inside configuration space defined by @params remove from @var all
1621 * values > minimum. Reduce configuration space accordingly.
1622 *
1623 * Return: The minimum, or a negative error code on failure.
1624 */
1625int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1626 struct snd_pcm_hw_params *params,
1627 snd_pcm_hw_param_t var, int *dir)
1628{
1629 int changed = _snd_pcm_hw_param_first(params, var);
1630 if (changed < 0)
1631 return changed;
1632 if (params->rmask) {
1633 int err = snd_pcm_hw_refine(pcm, params);
1634 if (snd_BUG_ON(err < 0))
1635 return err;
1636 }
1637 return snd_pcm_hw_param_value(params, var, dir);
1638}
1639
1640EXPORT_SYMBOL(snd_pcm_hw_param_first);
1641
1642static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1643 snd_pcm_hw_param_t var)
1644{
1645 int changed;
1646 if (hw_is_mask(var))
1647 changed = snd_mask_refine_last(hw_param_mask(params, var));
1648 else if (hw_is_interval(var))
1649 changed = snd_interval_refine_last(hw_param_interval(params, var));
1650 else
1651 return -EINVAL;
1652 if (changed) {
1653 params->cmask |= 1 << var;
1654 params->rmask |= 1 << var;
1655 }
1656 return changed;
1657}
1658
1659
1660/**
1661 * snd_pcm_hw_param_last - refine config space and return maximum value
1662 * @pcm: PCM instance
1663 * @params: the hw_params instance
1664 * @var: parameter to retrieve
1665 * @dir: pointer to the direction (-1,0,1) or %NULL
1666 *
1667 * Inside configuration space defined by @params remove from @var all
1668 * values < maximum. Reduce configuration space accordingly.
1669 *
1670 * Return: The maximum, or a negative error code on failure.
1671 */
1672int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1673 struct snd_pcm_hw_params *params,
1674 snd_pcm_hw_param_t var, int *dir)
1675{
1676 int changed = _snd_pcm_hw_param_last(params, var);
1677 if (changed < 0)
1678 return changed;
1679 if (params->rmask) {
1680 int err = snd_pcm_hw_refine(pcm, params);
1681 if (snd_BUG_ON(err < 0))
1682 return err;
1683 }
1684 return snd_pcm_hw_param_value(params, var, dir);
1685}
1686
1687EXPORT_SYMBOL(snd_pcm_hw_param_last);
1688
1689/**
1690 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1691 * @pcm: PCM instance
1692 * @params: the hw_params instance
1693 *
1694 * Choose one configuration from configuration space defined by @params.
1695 * The configuration chosen is that obtained fixing in this order:
1696 * first access, first format, first subformat, min channels,
1697 * min rate, min period time, max buffer size, min tick time
1698 *
1699 * Return: Zero if successful, or a negative error code on failure.
1700 */
1701int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1702 struct snd_pcm_hw_params *params)
1703{
1704 static int vars[] = {
1705 SNDRV_PCM_HW_PARAM_ACCESS,
1706 SNDRV_PCM_HW_PARAM_FORMAT,
1707 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1708 SNDRV_PCM_HW_PARAM_CHANNELS,
1709 SNDRV_PCM_HW_PARAM_RATE,
1710 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1711 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1712 SNDRV_PCM_HW_PARAM_TICK_TIME,
1713 -1
1714 };
1715 int err, *v;
1716
1717 for (v = vars; *v != -1; v++) {
1718 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1719 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1720 else
1721 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1722 if (snd_BUG_ON(err < 0))
1723 return err;
1724 }
1725 return 0;
1726}
1727
1728static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1729 void *arg)
1730{
1731 struct snd_pcm_runtime *runtime = substream->runtime;
1732 unsigned long flags;
1733 snd_pcm_stream_lock_irqsave(substream, flags);
1734 if (snd_pcm_running(substream) &&
1735 snd_pcm_update_hw_ptr(substream) >= 0)
1736 runtime->status->hw_ptr %= runtime->buffer_size;
1737 else {
1738 runtime->status->hw_ptr = 0;
1739 runtime->hw_ptr_wrap = 0;
1740 }
1741 snd_pcm_stream_unlock_irqrestore(substream, flags);
1742 return 0;
1743}
1744
1745static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1746 void *arg)
1747{
1748 struct snd_pcm_channel_info *info = arg;
1749 struct snd_pcm_runtime *runtime = substream->runtime;
1750 int width;
1751 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1752 info->offset = -1;
1753 return 0;
1754 }
1755 width = snd_pcm_format_physical_width(runtime->format);
1756 if (width < 0)
1757 return width;
1758 info->offset = 0;
1759 switch (runtime->access) {
1760 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1761 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1762 info->first = info->channel * width;
1763 info->step = runtime->channels * width;
1764 break;
1765 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1766 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1767 {
1768 size_t size = runtime->dma_bytes / runtime->channels;
1769 info->first = info->channel * size * 8;
1770 info->step = width;
1771 break;
1772 }
1773 default:
1774 snd_BUG();
1775 break;
1776 }
1777 return 0;
1778}
1779
1780static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1781 void *arg)
1782{
1783 struct snd_pcm_hw_params *params = arg;
1784 snd_pcm_format_t format;
1785 int channels, width;
1786
1787 params->fifo_size = substream->runtime->hw.fifo_size;
1788 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1789 format = params_format(params);
1790 channels = params_channels(params);
1791 width = snd_pcm_format_physical_width(format);
1792 params->fifo_size /= width * channels;
1793 }
1794 return 0;
1795}
1796
1797/**
1798 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1799 * @substream: the pcm substream instance
1800 * @cmd: ioctl command
1801 * @arg: ioctl argument
1802 *
1803 * Processes the generic ioctl commands for PCM.
1804 * Can be passed as the ioctl callback for PCM ops.
1805 *
1806 * Return: Zero if successful, or a negative error code on failure.
1807 */
1808int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1809 unsigned int cmd, void *arg)
1810{
1811 switch (cmd) {
1812 case SNDRV_PCM_IOCTL1_INFO:
1813 return 0;
1814 case SNDRV_PCM_IOCTL1_RESET:
1815 return snd_pcm_lib_ioctl_reset(substream, arg);
1816 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1817 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1818 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1819 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1820 }
1821 return -ENXIO;
1822}
1823
1824EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1825
1826/**
1827 * snd_pcm_period_elapsed - update the pcm status for the next period
1828 * @substream: the pcm substream instance
1829 *
1830 * This function is called from the interrupt handler when the
1831 * PCM has processed the period size. It will update the current
1832 * pointer, wake up sleepers, etc.
1833 *
1834 * Even if more than one periods have elapsed since the last call, you
1835 * have to call this only once.
1836 */
1837void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1838{
1839 struct snd_pcm_runtime *runtime;
1840 unsigned long flags;
1841
1842 if (PCM_RUNTIME_CHECK(substream))
1843 return;
1844 runtime = substream->runtime;
1845
1846 if (runtime->transfer_ack_begin)
1847 runtime->transfer_ack_begin(substream);
1848
1849 snd_pcm_stream_lock_irqsave(substream, flags);
1850 if (!snd_pcm_running(substream) ||
1851 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1852 goto _end;
1853
1854 if (substream->timer_running)
1855 snd_timer_interrupt(substream->timer, 1);
1856 _end:
1857 snd_pcm_stream_unlock_irqrestore(substream, flags);
1858 if (runtime->transfer_ack_end)
1859 runtime->transfer_ack_end(substream);
1860 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1861}
1862
1863EXPORT_SYMBOL(snd_pcm_period_elapsed);
1864
1865/*
1866 * Wait until avail_min data becomes available
1867 * Returns a negative error code if any error occurs during operation.
1868 * The available space is stored on availp. When err = 0 and avail = 0
1869 * on the capture stream, it indicates the stream is in DRAINING state.
1870 */
1871static int wait_for_avail(struct snd_pcm_substream *substream,
1872 snd_pcm_uframes_t *availp)
1873{
1874 struct snd_pcm_runtime *runtime = substream->runtime;
1875 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1876 wait_queue_t wait;
1877 int err = 0;
1878 snd_pcm_uframes_t avail = 0;
1879 long wait_time, tout;
1880
1881 init_waitqueue_entry(&wait, current);
1882 set_current_state(TASK_INTERRUPTIBLE);
1883 add_wait_queue(&runtime->tsleep, &wait);
1884
1885 if (runtime->no_period_wakeup)
1886 wait_time = MAX_SCHEDULE_TIMEOUT;
1887 else {
1888 wait_time = 10;
1889 if (runtime->rate) {
1890 long t = runtime->period_size * 2 / runtime->rate;
1891 wait_time = max(t, wait_time);
1892 }
1893 wait_time = msecs_to_jiffies(wait_time * 1000);
1894 }
1895
1896 for (;;) {
1897 if (signal_pending(current)) {
1898 err = -ERESTARTSYS;
1899 break;
1900 }
1901
1902 /*
1903 * We need to check if space became available already
1904 * (and thus the wakeup happened already) first to close
1905 * the race of space already having become available.
1906 * This check must happen after been added to the waitqueue
1907 * and having current state be INTERRUPTIBLE.
1908 */
1909 if (is_playback)
1910 avail = snd_pcm_playback_avail(runtime);
1911 else
1912 avail = snd_pcm_capture_avail(runtime);
1913 if (avail >= runtime->twake)
1914 break;
1915 snd_pcm_stream_unlock_irq(substream);
1916
1917 tout = schedule_timeout(wait_time);
1918
1919 snd_pcm_stream_lock_irq(substream);
1920 set_current_state(TASK_INTERRUPTIBLE);
1921 switch (runtime->status->state) {
1922 case SNDRV_PCM_STATE_SUSPENDED:
1923 err = -ESTRPIPE;
1924 goto _endloop;
1925 case SNDRV_PCM_STATE_XRUN:
1926 err = -EPIPE;
1927 goto _endloop;
1928 case SNDRV_PCM_STATE_DRAINING:
1929 if (is_playback)
1930 err = -EPIPE;
1931 else
1932 avail = 0; /* indicate draining */
1933 goto _endloop;
1934 case SNDRV_PCM_STATE_OPEN:
1935 case SNDRV_PCM_STATE_SETUP:
1936 case SNDRV_PCM_STATE_DISCONNECTED:
1937 err = -EBADFD;
1938 goto _endloop;
1939 case SNDRV_PCM_STATE_PAUSED:
1940 continue;
1941 }
1942 if (!tout) {
1943 pcm_dbg(substream->pcm,
1944 "%s write error (DMA or IRQ trouble?)\n",
1945 is_playback ? "playback" : "capture");
1946 err = -EIO;
1947 break;
1948 }
1949 }
1950 _endloop:
1951 set_current_state(TASK_RUNNING);
1952 remove_wait_queue(&runtime->tsleep, &wait);
1953 *availp = avail;
1954 return err;
1955}
1956
1957static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1958 unsigned int hwoff,
1959 unsigned long data, unsigned int off,
1960 snd_pcm_uframes_t frames)
1961{
1962 struct snd_pcm_runtime *runtime = substream->runtime;
1963 int err;
1964 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1965 if (substream->ops->copy) {
1966 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1967 return err;
1968 } else {
1969 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1970 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1971 return -EFAULT;
1972 }
1973 return 0;
1974}
1975
1976typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1977 unsigned long data, unsigned int off,
1978 snd_pcm_uframes_t size);
1979
1980static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1981 unsigned long data,
1982 snd_pcm_uframes_t size,
1983 int nonblock,
1984 transfer_f transfer)
1985{
1986 struct snd_pcm_runtime *runtime = substream->runtime;
1987 snd_pcm_uframes_t xfer = 0;
1988 snd_pcm_uframes_t offset = 0;
1989 snd_pcm_uframes_t avail;
1990 int err = 0;
1991
1992 if (size == 0)
1993 return 0;
1994
1995 snd_pcm_stream_lock_irq(substream);
1996 switch (runtime->status->state) {
1997 case SNDRV_PCM_STATE_PREPARED:
1998 case SNDRV_PCM_STATE_RUNNING:
1999 case SNDRV_PCM_STATE_PAUSED:
2000 break;
2001 case SNDRV_PCM_STATE_XRUN:
2002 err = -EPIPE;
2003 goto _end_unlock;
2004 case SNDRV_PCM_STATE_SUSPENDED:
2005 err = -ESTRPIPE;
2006 goto _end_unlock;
2007 default:
2008 err = -EBADFD;
2009 goto _end_unlock;
2010 }
2011
2012 runtime->twake = runtime->control->avail_min ? : 1;
2013 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2014 snd_pcm_update_hw_ptr(substream);
2015 avail = snd_pcm_playback_avail(runtime);
2016 while (size > 0) {
2017 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2018 snd_pcm_uframes_t cont;
2019 if (!avail) {
2020 if (nonblock) {
2021 err = -EAGAIN;
2022 goto _end_unlock;
2023 }
2024 runtime->twake = min_t(snd_pcm_uframes_t, size,
2025 runtime->control->avail_min ? : 1);
2026 err = wait_for_avail(substream, &avail);
2027 if (err < 0)
2028 goto _end_unlock;
2029 }
2030 frames = size > avail ? avail : size;
2031 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2032 if (frames > cont)
2033 frames = cont;
2034 if (snd_BUG_ON(!frames)) {
2035 runtime->twake = 0;
2036 snd_pcm_stream_unlock_irq(substream);
2037 return -EINVAL;
2038 }
2039 appl_ptr = runtime->control->appl_ptr;
2040 appl_ofs = appl_ptr % runtime->buffer_size;
2041 snd_pcm_stream_unlock_irq(substream);
2042 err = transfer(substream, appl_ofs, data, offset, frames);
2043 snd_pcm_stream_lock_irq(substream);
2044 if (err < 0)
2045 goto _end_unlock;
2046 switch (runtime->status->state) {
2047 case SNDRV_PCM_STATE_XRUN:
2048 err = -EPIPE;
2049 goto _end_unlock;
2050 case SNDRV_PCM_STATE_SUSPENDED:
2051 err = -ESTRPIPE;
2052 goto _end_unlock;
2053 default:
2054 break;
2055 }
2056 appl_ptr += frames;
2057 if (appl_ptr >= runtime->boundary)
2058 appl_ptr -= runtime->boundary;
2059 runtime->control->appl_ptr = appl_ptr;
2060 if (substream->ops->ack)
2061 substream->ops->ack(substream);
2062
2063 offset += frames;
2064 size -= frames;
2065 xfer += frames;
2066 avail -= frames;
2067 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2068 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2069 err = snd_pcm_start(substream);
2070 if (err < 0)
2071 goto _end_unlock;
2072 }
2073 }
2074 _end_unlock:
2075 runtime->twake = 0;
2076 if (xfer > 0 && err >= 0)
2077 snd_pcm_update_state(substream, runtime);
2078 snd_pcm_stream_unlock_irq(substream);
2079 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2080}
2081
2082/* sanity-check for read/write methods */
2083static int pcm_sanity_check(struct snd_pcm_substream *substream)
2084{
2085 struct snd_pcm_runtime *runtime;
2086 if (PCM_RUNTIME_CHECK(substream))
2087 return -ENXIO;
2088 runtime = substream->runtime;
2089 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
2090 return -EINVAL;
2091 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2092 return -EBADFD;
2093 return 0;
2094}
2095
2096snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2097{
2098 struct snd_pcm_runtime *runtime;
2099 int nonblock;
2100 int err;
2101
2102 err = pcm_sanity_check(substream);
2103 if (err < 0)
2104 return err;
2105 runtime = substream->runtime;
2106 nonblock = !!(substream->f_flags & O_NONBLOCK);
2107
2108 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2109 runtime->channels > 1)
2110 return -EINVAL;
2111 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2112 snd_pcm_lib_write_transfer);
2113}
2114
2115EXPORT_SYMBOL(snd_pcm_lib_write);
2116
2117static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
2118 unsigned int hwoff,
2119 unsigned long data, unsigned int off,
2120 snd_pcm_uframes_t frames)
2121{
2122 struct snd_pcm_runtime *runtime = substream->runtime;
2123 int err;
2124 void __user **bufs = (void __user **)data;
2125 int channels = runtime->channels;
2126 int c;
2127 if (substream->ops->copy) {
2128 if (snd_BUG_ON(!substream->ops->silence))
2129 return -EINVAL;
2130 for (c = 0; c < channels; ++c, ++bufs) {
2131 if (*bufs == NULL) {
2132 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2133 return err;
2134 } else {
2135 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2136 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2137 return err;
2138 }
2139 }
2140 } else {
2141 /* default transfer behaviour */
2142 size_t dma_csize = runtime->dma_bytes / channels;
2143 for (c = 0; c < channels; ++c, ++bufs) {
2144 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2145 if (*bufs == NULL) {
2146 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2147 } else {
2148 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2149 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2150 return -EFAULT;
2151 }
2152 }
2153 }
2154 return 0;
2155}
2156
2157snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2158 void __user **bufs,
2159 snd_pcm_uframes_t frames)
2160{
2161 struct snd_pcm_runtime *runtime;
2162 int nonblock;
2163 int err;
2164
2165 err = pcm_sanity_check(substream);
2166 if (err < 0)
2167 return err;
2168 runtime = substream->runtime;
2169 nonblock = !!(substream->f_flags & O_NONBLOCK);
2170
2171 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2172 return -EINVAL;
2173 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2174 nonblock, snd_pcm_lib_writev_transfer);
2175}
2176
2177EXPORT_SYMBOL(snd_pcm_lib_writev);
2178
2179static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2180 unsigned int hwoff,
2181 unsigned long data, unsigned int off,
2182 snd_pcm_uframes_t frames)
2183{
2184 struct snd_pcm_runtime *runtime = substream->runtime;
2185 int err;
2186 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2187 if (substream->ops->copy) {
2188 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2189 return err;
2190 } else {
2191 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2192 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2193 return -EFAULT;
2194 }
2195 return 0;
2196}
2197
2198static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2199 unsigned long data,
2200 snd_pcm_uframes_t size,
2201 int nonblock,
2202 transfer_f transfer)
2203{
2204 struct snd_pcm_runtime *runtime = substream->runtime;
2205 snd_pcm_uframes_t xfer = 0;
2206 snd_pcm_uframes_t offset = 0;
2207 snd_pcm_uframes_t avail;
2208 int err = 0;
2209
2210 if (size == 0)
2211 return 0;
2212
2213 snd_pcm_stream_lock_irq(substream);
2214 switch (runtime->status->state) {
2215 case SNDRV_PCM_STATE_PREPARED:
2216 if (size >= runtime->start_threshold) {
2217 err = snd_pcm_start(substream);
2218 if (err < 0)
2219 goto _end_unlock;
2220 }
2221 break;
2222 case SNDRV_PCM_STATE_DRAINING:
2223 case SNDRV_PCM_STATE_RUNNING:
2224 case SNDRV_PCM_STATE_PAUSED:
2225 break;
2226 case SNDRV_PCM_STATE_XRUN:
2227 err = -EPIPE;
2228 goto _end_unlock;
2229 case SNDRV_PCM_STATE_SUSPENDED:
2230 err = -ESTRPIPE;
2231 goto _end_unlock;
2232 default:
2233 err = -EBADFD;
2234 goto _end_unlock;
2235 }
2236
2237 runtime->twake = runtime->control->avail_min ? : 1;
2238 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2239 snd_pcm_update_hw_ptr(substream);
2240 avail = snd_pcm_capture_avail(runtime);
2241 while (size > 0) {
2242 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2243 snd_pcm_uframes_t cont;
2244 if (!avail) {
2245 if (runtime->status->state ==
2246 SNDRV_PCM_STATE_DRAINING) {
2247 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2248 goto _end_unlock;
2249 }
2250 if (nonblock) {
2251 err = -EAGAIN;
2252 goto _end_unlock;
2253 }
2254 runtime->twake = min_t(snd_pcm_uframes_t, size,
2255 runtime->control->avail_min ? : 1);
2256 err = wait_for_avail(substream, &avail);
2257 if (err < 0)
2258 goto _end_unlock;
2259 if (!avail)
2260 continue; /* draining */
2261 }
2262 frames = size > avail ? avail : size;
2263 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2264 if (frames > cont)
2265 frames = cont;
2266 if (snd_BUG_ON(!frames)) {
2267 runtime->twake = 0;
2268 snd_pcm_stream_unlock_irq(substream);
2269 return -EINVAL;
2270 }
2271 appl_ptr = runtime->control->appl_ptr;
2272 appl_ofs = appl_ptr % runtime->buffer_size;
2273 snd_pcm_stream_unlock_irq(substream);
2274 err = transfer(substream, appl_ofs, data, offset, frames);
2275 snd_pcm_stream_lock_irq(substream);
2276 if (err < 0)
2277 goto _end_unlock;
2278 switch (runtime->status->state) {
2279 case SNDRV_PCM_STATE_XRUN:
2280 err = -EPIPE;
2281 goto _end_unlock;
2282 case SNDRV_PCM_STATE_SUSPENDED:
2283 err = -ESTRPIPE;
2284 goto _end_unlock;
2285 default:
2286 break;
2287 }
2288 appl_ptr += frames;
2289 if (appl_ptr >= runtime->boundary)
2290 appl_ptr -= runtime->boundary;
2291 runtime->control->appl_ptr = appl_ptr;
2292 if (substream->ops->ack)
2293 substream->ops->ack(substream);
2294
2295 offset += frames;
2296 size -= frames;
2297 xfer += frames;
2298 avail -= frames;
2299 }
2300 _end_unlock:
2301 runtime->twake = 0;
2302 if (xfer > 0 && err >= 0)
2303 snd_pcm_update_state(substream, runtime);
2304 snd_pcm_stream_unlock_irq(substream);
2305 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2306}
2307
2308snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2309{
2310 struct snd_pcm_runtime *runtime;
2311 int nonblock;
2312 int err;
2313
2314 err = pcm_sanity_check(substream);
2315 if (err < 0)
2316 return err;
2317 runtime = substream->runtime;
2318 nonblock = !!(substream->f_flags & O_NONBLOCK);
2319 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2320 return -EINVAL;
2321 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2322}
2323
2324EXPORT_SYMBOL(snd_pcm_lib_read);
2325
2326static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2327 unsigned int hwoff,
2328 unsigned long data, unsigned int off,
2329 snd_pcm_uframes_t frames)
2330{
2331 struct snd_pcm_runtime *runtime = substream->runtime;
2332 int err;
2333 void __user **bufs = (void __user **)data;
2334 int channels = runtime->channels;
2335 int c;
2336 if (substream->ops->copy) {
2337 for (c = 0; c < channels; ++c, ++bufs) {
2338 char __user *buf;
2339 if (*bufs == NULL)
2340 continue;
2341 buf = *bufs + samples_to_bytes(runtime, off);
2342 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2343 return err;
2344 }
2345 } else {
2346 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2347 for (c = 0; c < channels; ++c, ++bufs) {
2348 char *hwbuf;
2349 char __user *buf;
2350 if (*bufs == NULL)
2351 continue;
2352
2353 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2354 buf = *bufs + samples_to_bytes(runtime, off);
2355 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2356 return -EFAULT;
2357 }
2358 }
2359 return 0;
2360}
2361
2362snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2363 void __user **bufs,
2364 snd_pcm_uframes_t frames)
2365{
2366 struct snd_pcm_runtime *runtime;
2367 int nonblock;
2368 int err;
2369
2370 err = pcm_sanity_check(substream);
2371 if (err < 0)
2372 return err;
2373 runtime = substream->runtime;
2374 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2375 return -EBADFD;
2376
2377 nonblock = !!(substream->f_flags & O_NONBLOCK);
2378 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2379 return -EINVAL;
2380 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2381}
2382
2383EXPORT_SYMBOL(snd_pcm_lib_readv);
2384
2385/*
2386 * standard channel mapping helpers
2387 */
2388
2389/* default channel maps for multi-channel playbacks, up to 8 channels */
2390const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2391 { .channels = 1,
2392 .map = { SNDRV_CHMAP_MONO } },
2393 { .channels = 2,
2394 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2395 { .channels = 4,
2396 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2397 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2398 { .channels = 6,
2399 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2400 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2401 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2402 { .channels = 8,
2403 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2404 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2405 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2406 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2407 { }
2408};
2409EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2410
2411/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2412const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2413 { .channels = 1,
2414 .map = { SNDRV_CHMAP_MONO } },
2415 { .channels = 2,
2416 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2417 { .channels = 4,
2418 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2419 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2420 { .channels = 6,
2421 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2422 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2423 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2424 { .channels = 8,
2425 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2426 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2427 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2428 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2429 { }
2430};
2431EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2432
2433static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2434{
2435 if (ch > info->max_channels)
2436 return false;
2437 return !info->channel_mask || (info->channel_mask & (1U << ch));
2438}
2439
2440static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2441 struct snd_ctl_elem_info *uinfo)
2442{
2443 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2444
2445 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2446 uinfo->count = 0;
2447 uinfo->count = info->max_channels;
2448 uinfo->value.integer.min = 0;
2449 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2450 return 0;
2451}
2452
2453/* get callback for channel map ctl element
2454 * stores the channel position firstly matching with the current channels
2455 */
2456static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2457 struct snd_ctl_elem_value *ucontrol)
2458{
2459 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2460 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2461 struct snd_pcm_substream *substream;
2462 const struct snd_pcm_chmap_elem *map;
2463
2464 if (snd_BUG_ON(!info->chmap))
2465 return -EINVAL;
2466 substream = snd_pcm_chmap_substream(info, idx);
2467 if (!substream)
2468 return -ENODEV;
2469 memset(ucontrol->value.integer.value, 0,
2470 sizeof(ucontrol->value.integer.value));
2471 if (!substream->runtime)
2472 return 0; /* no channels set */
2473 for (map = info->chmap; map->channels; map++) {
2474 int i;
2475 if (map->channels == substream->runtime->channels &&
2476 valid_chmap_channels(info, map->channels)) {
2477 for (i = 0; i < map->channels; i++)
2478 ucontrol->value.integer.value[i] = map->map[i];
2479 return 0;
2480 }
2481 }
2482 return -EINVAL;
2483}
2484
2485/* tlv callback for channel map ctl element
2486 * expands the pre-defined channel maps in a form of TLV
2487 */
2488static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2489 unsigned int size, unsigned int __user *tlv)
2490{
2491 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2492 const struct snd_pcm_chmap_elem *map;
2493 unsigned int __user *dst;
2494 int c, count = 0;
2495
2496 if (snd_BUG_ON(!info->chmap))
2497 return -EINVAL;
2498 if (size < 8)
2499 return -ENOMEM;
2500 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2501 return -EFAULT;
2502 size -= 8;
2503 dst = tlv + 2;
2504 for (map = info->chmap; map->channels; map++) {
2505 int chs_bytes = map->channels * 4;
2506 if (!valid_chmap_channels(info, map->channels))
2507 continue;
2508 if (size < 8)
2509 return -ENOMEM;
2510 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2511 put_user(chs_bytes, dst + 1))
2512 return -EFAULT;
2513 dst += 2;
2514 size -= 8;
2515 count += 8;
2516 if (size < chs_bytes)
2517 return -ENOMEM;
2518 size -= chs_bytes;
2519 count += chs_bytes;
2520 for (c = 0; c < map->channels; c++) {
2521 if (put_user(map->map[c], dst))
2522 return -EFAULT;
2523 dst++;
2524 }
2525 }
2526 if (put_user(count, tlv + 1))
2527 return -EFAULT;
2528 return 0;
2529}
2530
2531static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2532{
2533 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2534 info->pcm->streams[info->stream].chmap_kctl = NULL;
2535 kfree(info);
2536}
2537
2538/**
2539 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2540 * @pcm: the assigned PCM instance
2541 * @stream: stream direction
2542 * @chmap: channel map elements (for query)
2543 * @max_channels: the max number of channels for the stream
2544 * @private_value: the value passed to each kcontrol's private_value field
2545 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2546 *
2547 * Create channel-mapping control elements assigned to the given PCM stream(s).
2548 * Return: Zero if successful, or a negative error value.
2549 */
2550int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2551 const struct snd_pcm_chmap_elem *chmap,
2552 int max_channels,
2553 unsigned long private_value,
2554 struct snd_pcm_chmap **info_ret)
2555{
2556 struct snd_pcm_chmap *info;
2557 struct snd_kcontrol_new knew = {
2558 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2559 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2560 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2561 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2562 .info = pcm_chmap_ctl_info,
2563 .get = pcm_chmap_ctl_get,
2564 .tlv.c = pcm_chmap_ctl_tlv,
2565 };
2566 int err;
2567
2568 info = kzalloc(sizeof(*info), GFP_KERNEL);
2569 if (!info)
2570 return -ENOMEM;
2571 info->pcm = pcm;
2572 info->stream = stream;
2573 info->chmap = chmap;
2574 info->max_channels = max_channels;
2575 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2576 knew.name = "Playback Channel Map";
2577 else
2578 knew.name = "Capture Channel Map";
2579 knew.device = pcm->device;
2580 knew.count = pcm->streams[stream].substream_count;
2581 knew.private_value = private_value;
2582 info->kctl = snd_ctl_new1(&knew, info);
2583 if (!info->kctl) {
2584 kfree(info);
2585 return -ENOMEM;
2586 }
2587 info->kctl->private_free = pcm_chmap_ctl_private_free;
2588 err = snd_ctl_add(pcm->card, info->kctl);
2589 if (err < 0)
2590 return err;
2591 pcm->streams[stream].chmap_kctl = info->kctl;
2592 if (info_ret)
2593 *info_ret = info;
2594 return 0;
2595}
2596EXPORT_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 <linux/export.h>
27#include <sound/core.h>
28#include <sound/control.h>
29#include <sound/tlv.h>
30#include <sound/info.h>
31#include <sound/pcm.h>
32#include <sound/pcm_params.h>
33#include <sound/timer.h>
34
35#ifdef CONFIG_SND_PCM_XRUN_DEBUG
36#define CREATE_TRACE_POINTS
37#include "pcm_trace.h"
38#else
39#define trace_hwptr(substream, pos, in_interrupt)
40#define trace_xrun(substream)
41#define trace_hw_ptr_error(substream, reason)
42#endif
43
44/*
45 * fill ring buffer with silence
46 * runtime->silence_start: starting pointer to silence area
47 * runtime->silence_filled: size filled with silence
48 * runtime->silence_threshold: threshold from application
49 * runtime->silence_size: maximal size from application
50 *
51 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
52 */
53void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
54{
55 struct snd_pcm_runtime *runtime = substream->runtime;
56 snd_pcm_uframes_t frames, ofs, transfer;
57
58 if (runtime->silence_size < runtime->boundary) {
59 snd_pcm_sframes_t noise_dist, n;
60 if (runtime->silence_start != runtime->control->appl_ptr) {
61 n = runtime->control->appl_ptr - runtime->silence_start;
62 if (n < 0)
63 n += runtime->boundary;
64 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
65 runtime->silence_filled -= n;
66 else
67 runtime->silence_filled = 0;
68 runtime->silence_start = runtime->control->appl_ptr;
69 }
70 if (runtime->silence_filled >= runtime->buffer_size)
71 return;
72 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
73 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
74 return;
75 frames = runtime->silence_threshold - noise_dist;
76 if (frames > runtime->silence_size)
77 frames = runtime->silence_size;
78 } else {
79 if (new_hw_ptr == ULONG_MAX) { /* initialization */
80 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
81 if (avail > runtime->buffer_size)
82 avail = runtime->buffer_size;
83 runtime->silence_filled = avail > 0 ? avail : 0;
84 runtime->silence_start = (runtime->status->hw_ptr +
85 runtime->silence_filled) %
86 runtime->boundary;
87 } else {
88 ofs = runtime->status->hw_ptr;
89 frames = new_hw_ptr - ofs;
90 if ((snd_pcm_sframes_t)frames < 0)
91 frames += runtime->boundary;
92 runtime->silence_filled -= frames;
93 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
94 runtime->silence_filled = 0;
95 runtime->silence_start = new_hw_ptr;
96 } else {
97 runtime->silence_start = ofs;
98 }
99 }
100 frames = runtime->buffer_size - runtime->silence_filled;
101 }
102 if (snd_BUG_ON(frames > runtime->buffer_size))
103 return;
104 if (frames == 0)
105 return;
106 ofs = runtime->silence_start % runtime->buffer_size;
107 while (frames > 0) {
108 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
109 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
110 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
111 if (substream->ops->silence) {
112 int err;
113 err = substream->ops->silence(substream, -1, ofs, transfer);
114 snd_BUG_ON(err < 0);
115 } else {
116 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
117 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
118 }
119 } else {
120 unsigned int c;
121 unsigned int channels = runtime->channels;
122 if (substream->ops->silence) {
123 for (c = 0; c < channels; ++c) {
124 int err;
125 err = substream->ops->silence(substream, c, ofs, transfer);
126 snd_BUG_ON(err < 0);
127 }
128 } else {
129 size_t dma_csize = runtime->dma_bytes / channels;
130 for (c = 0; c < channels; ++c) {
131 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
132 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
133 }
134 }
135 }
136 runtime->silence_filled += transfer;
137 frames -= transfer;
138 ofs = 0;
139 }
140}
141
142#ifdef CONFIG_SND_DEBUG
143void snd_pcm_debug_name(struct snd_pcm_substream *substream,
144 char *name, size_t len)
145{
146 snprintf(name, len, "pcmC%dD%d%c:%d",
147 substream->pcm->card->number,
148 substream->pcm->device,
149 substream->stream ? 'c' : 'p',
150 substream->number);
151}
152EXPORT_SYMBOL(snd_pcm_debug_name);
153#endif
154
155#define XRUN_DEBUG_BASIC (1<<0)
156#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
157#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
158
159#ifdef CONFIG_SND_PCM_XRUN_DEBUG
160
161#define xrun_debug(substream, mask) \
162 ((substream)->pstr->xrun_debug & (mask))
163#else
164#define xrun_debug(substream, mask) 0
165#endif
166
167#define dump_stack_on_xrun(substream) do { \
168 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
169 dump_stack(); \
170 } while (0)
171
172static void xrun(struct snd_pcm_substream *substream)
173{
174 struct snd_pcm_runtime *runtime = substream->runtime;
175
176 trace_xrun(substream);
177 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
178 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
179 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
180 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
181 char name[16];
182 snd_pcm_debug_name(substream, name, sizeof(name));
183 pcm_warn(substream->pcm, "XRUN: %s\n", name);
184 dump_stack_on_xrun(substream);
185 }
186}
187
188#ifdef CONFIG_SND_PCM_XRUN_DEBUG
189#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
190 do { \
191 trace_hw_ptr_error(substream, reason); \
192 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
193 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
194 (in_interrupt) ? 'Q' : 'P', ##args); \
195 dump_stack_on_xrun(substream); \
196 } \
197 } while (0)
198
199#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
200
201#define hw_ptr_error(substream, fmt, args...) do { } while (0)
202
203#endif
204
205int snd_pcm_update_state(struct snd_pcm_substream *substream,
206 struct snd_pcm_runtime *runtime)
207{
208 snd_pcm_uframes_t avail;
209
210 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
211 avail = snd_pcm_playback_avail(runtime);
212 else
213 avail = snd_pcm_capture_avail(runtime);
214 if (avail > runtime->avail_max)
215 runtime->avail_max = avail;
216 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
217 if (avail >= runtime->buffer_size) {
218 snd_pcm_drain_done(substream);
219 return -EPIPE;
220 }
221 } else {
222 if (avail >= runtime->stop_threshold) {
223 xrun(substream);
224 return -EPIPE;
225 }
226 }
227 if (runtime->twake) {
228 if (avail >= runtime->twake)
229 wake_up(&runtime->tsleep);
230 } else if (avail >= runtime->control->avail_min)
231 wake_up(&runtime->sleep);
232 return 0;
233}
234
235static void update_audio_tstamp(struct snd_pcm_substream *substream,
236 struct timespec *curr_tstamp,
237 struct timespec *audio_tstamp)
238{
239 struct snd_pcm_runtime *runtime = substream->runtime;
240 u64 audio_frames, audio_nsecs;
241 struct timespec driver_tstamp;
242
243 if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
244 return;
245
246 if (!(substream->ops->get_time_info) ||
247 (runtime->audio_tstamp_report.actual_type ==
248 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
249
250 /*
251 * provide audio timestamp derived from pointer position
252 * add delay only if requested
253 */
254
255 audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
256
257 if (runtime->audio_tstamp_config.report_delay) {
258 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
259 audio_frames -= runtime->delay;
260 else
261 audio_frames += runtime->delay;
262 }
263 audio_nsecs = div_u64(audio_frames * 1000000000LL,
264 runtime->rate);
265 *audio_tstamp = ns_to_timespec(audio_nsecs);
266 }
267 runtime->status->audio_tstamp = *audio_tstamp;
268 runtime->status->tstamp = *curr_tstamp;
269
270 /*
271 * re-take a driver timestamp to let apps detect if the reference tstamp
272 * read by low-level hardware was provided with a delay
273 */
274 snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);
275 runtime->driver_tstamp = driver_tstamp;
276}
277
278static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
279 unsigned int in_interrupt)
280{
281 struct snd_pcm_runtime *runtime = substream->runtime;
282 snd_pcm_uframes_t pos;
283 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
284 snd_pcm_sframes_t hdelta, delta;
285 unsigned long jdelta;
286 unsigned long curr_jiffies;
287 struct timespec curr_tstamp;
288 struct timespec audio_tstamp;
289 int crossed_boundary = 0;
290
291 old_hw_ptr = runtime->status->hw_ptr;
292
293 /*
294 * group pointer, time and jiffies reads to allow for more
295 * accurate correlations/corrections.
296 * The values are stored at the end of this routine after
297 * corrections for hw_ptr position
298 */
299 pos = substream->ops->pointer(substream);
300 curr_jiffies = jiffies;
301 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
302 if ((substream->ops->get_time_info) &&
303 (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
304 substream->ops->get_time_info(substream, &curr_tstamp,
305 &audio_tstamp,
306 &runtime->audio_tstamp_config,
307 &runtime->audio_tstamp_report);
308
309 /* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */
310 if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
311 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
312 } else
313 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
314 }
315
316 if (pos == SNDRV_PCM_POS_XRUN) {
317 xrun(substream);
318 return -EPIPE;
319 }
320 if (pos >= runtime->buffer_size) {
321 if (printk_ratelimit()) {
322 char name[16];
323 snd_pcm_debug_name(substream, name, sizeof(name));
324 pcm_err(substream->pcm,
325 "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
326 name, pos, runtime->buffer_size,
327 runtime->period_size);
328 }
329 pos = 0;
330 }
331 pos -= pos % runtime->min_align;
332 trace_hwptr(substream, pos, in_interrupt);
333 hw_base = runtime->hw_ptr_base;
334 new_hw_ptr = hw_base + pos;
335 if (in_interrupt) {
336 /* we know that one period was processed */
337 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
338 delta = runtime->hw_ptr_interrupt + runtime->period_size;
339 if (delta > new_hw_ptr) {
340 /* check for double acknowledged interrupts */
341 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
342 if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
343 hw_base += runtime->buffer_size;
344 if (hw_base >= runtime->boundary) {
345 hw_base = 0;
346 crossed_boundary++;
347 }
348 new_hw_ptr = hw_base + pos;
349 goto __delta;
350 }
351 }
352 }
353 /* new_hw_ptr might be lower than old_hw_ptr in case when */
354 /* pointer crosses the end of the ring buffer */
355 if (new_hw_ptr < old_hw_ptr) {
356 hw_base += runtime->buffer_size;
357 if (hw_base >= runtime->boundary) {
358 hw_base = 0;
359 crossed_boundary++;
360 }
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
368 if (runtime->no_period_wakeup) {
369 snd_pcm_sframes_t xrun_threshold;
370 /*
371 * Without regular period interrupts, we have to check
372 * the elapsed time to detect xruns.
373 */
374 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
375 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
376 goto no_delta_check;
377 hdelta = jdelta - delta * HZ / runtime->rate;
378 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
379 while (hdelta > xrun_threshold) {
380 delta += runtime->buffer_size;
381 hw_base += runtime->buffer_size;
382 if (hw_base >= runtime->boundary) {
383 hw_base = 0;
384 crossed_boundary++;
385 }
386 new_hw_ptr = hw_base + pos;
387 hdelta -= runtime->hw_ptr_buffer_jiffies;
388 }
389 goto no_delta_check;
390 }
391
392 /* something must be really wrong */
393 if (delta >= runtime->buffer_size + runtime->period_size) {
394 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
395 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
396 substream->stream, (long)pos,
397 (long)new_hw_ptr, (long)old_hw_ptr);
398 return 0;
399 }
400
401 /* Do jiffies check only in xrun_debug mode */
402 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
403 goto no_jiffies_check;
404
405 /* Skip the jiffies check for hardwares with BATCH flag.
406 * Such hardware usually just increases the position at each IRQ,
407 * thus it can't give any strange position.
408 */
409 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
410 goto no_jiffies_check;
411 hdelta = delta;
412 if (hdelta < runtime->delay)
413 goto no_jiffies_check;
414 hdelta -= runtime->delay;
415 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
416 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
417 delta = jdelta /
418 (((runtime->period_size * HZ) / runtime->rate)
419 + HZ/100);
420 /* move new_hw_ptr according jiffies not pos variable */
421 new_hw_ptr = old_hw_ptr;
422 hw_base = delta;
423 /* use loop to avoid checks for delta overflows */
424 /* the delta value is small or zero in most cases */
425 while (delta > 0) {
426 new_hw_ptr += runtime->period_size;
427 if (new_hw_ptr >= runtime->boundary) {
428 new_hw_ptr -= runtime->boundary;
429 crossed_boundary--;
430 }
431 delta--;
432 }
433 /* align hw_base to buffer_size */
434 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
435 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
436 (long)pos, (long)hdelta,
437 (long)runtime->period_size, jdelta,
438 ((hdelta * HZ) / runtime->rate), hw_base,
439 (unsigned long)old_hw_ptr,
440 (unsigned long)new_hw_ptr);
441 /* reset values to proper state */
442 delta = 0;
443 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
444 }
445 no_jiffies_check:
446 if (delta > runtime->period_size + runtime->period_size / 2) {
447 hw_ptr_error(substream, in_interrupt,
448 "Lost interrupts?",
449 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
450 substream->stream, (long)delta,
451 (long)new_hw_ptr,
452 (long)old_hw_ptr);
453 }
454
455 no_delta_check:
456 if (runtime->status->hw_ptr == new_hw_ptr) {
457 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
458 return 0;
459 }
460
461 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
462 runtime->silence_size > 0)
463 snd_pcm_playback_silence(substream, new_hw_ptr);
464
465 if (in_interrupt) {
466 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
467 if (delta < 0)
468 delta += runtime->boundary;
469 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
470 runtime->hw_ptr_interrupt += delta;
471 if (runtime->hw_ptr_interrupt >= runtime->boundary)
472 runtime->hw_ptr_interrupt -= runtime->boundary;
473 }
474 runtime->hw_ptr_base = hw_base;
475 runtime->status->hw_ptr = new_hw_ptr;
476 runtime->hw_ptr_jiffies = curr_jiffies;
477 if (crossed_boundary) {
478 snd_BUG_ON(crossed_boundary != 1);
479 runtime->hw_ptr_wrap += runtime->boundary;
480 }
481
482 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
483
484 return snd_pcm_update_state(substream, runtime);
485}
486
487/* CAUTION: call it with irq disabled */
488int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
489{
490 return snd_pcm_update_hw_ptr0(substream, 0);
491}
492
493/**
494 * snd_pcm_set_ops - set the PCM operators
495 * @pcm: the pcm instance
496 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
497 * @ops: the operator table
498 *
499 * Sets the given PCM operators to the pcm instance.
500 */
501void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
502 const struct snd_pcm_ops *ops)
503{
504 struct snd_pcm_str *stream = &pcm->streams[direction];
505 struct snd_pcm_substream *substream;
506
507 for (substream = stream->substream; substream != NULL; substream = substream->next)
508 substream->ops = ops;
509}
510
511EXPORT_SYMBOL(snd_pcm_set_ops);
512
513/**
514 * snd_pcm_sync - set the PCM sync id
515 * @substream: the pcm substream
516 *
517 * Sets the PCM sync identifier for the card.
518 */
519void snd_pcm_set_sync(struct snd_pcm_substream *substream)
520{
521 struct snd_pcm_runtime *runtime = substream->runtime;
522
523 runtime->sync.id32[0] = substream->pcm->card->number;
524 runtime->sync.id32[1] = -1;
525 runtime->sync.id32[2] = -1;
526 runtime->sync.id32[3] = -1;
527}
528
529EXPORT_SYMBOL(snd_pcm_set_sync);
530
531/*
532 * Standard ioctl routine
533 */
534
535static inline unsigned int div32(unsigned int a, unsigned int b,
536 unsigned int *r)
537{
538 if (b == 0) {
539 *r = 0;
540 return UINT_MAX;
541 }
542 *r = a % b;
543 return a / b;
544}
545
546static inline unsigned int div_down(unsigned int a, unsigned int b)
547{
548 if (b == 0)
549 return UINT_MAX;
550 return a / b;
551}
552
553static inline unsigned int div_up(unsigned int a, unsigned int b)
554{
555 unsigned int r;
556 unsigned int q;
557 if (b == 0)
558 return UINT_MAX;
559 q = div32(a, b, &r);
560 if (r)
561 ++q;
562 return q;
563}
564
565static inline unsigned int mul(unsigned int a, unsigned int b)
566{
567 if (a == 0)
568 return 0;
569 if (div_down(UINT_MAX, a) < b)
570 return UINT_MAX;
571 return a * b;
572}
573
574static inline unsigned int muldiv32(unsigned int a, unsigned int b,
575 unsigned int c, unsigned int *r)
576{
577 u_int64_t n = (u_int64_t) a * b;
578 if (c == 0) {
579 snd_BUG_ON(!n);
580 *r = 0;
581 return UINT_MAX;
582 }
583 n = div_u64_rem(n, c, r);
584 if (n >= UINT_MAX) {
585 *r = 0;
586 return UINT_MAX;
587 }
588 return n;
589}
590
591/**
592 * snd_interval_refine - refine the interval value of configurator
593 * @i: the interval value to refine
594 * @v: the interval value to refer to
595 *
596 * Refines the interval value with the reference value.
597 * The interval is changed to the range satisfying both intervals.
598 * The interval status (min, max, integer, etc.) are evaluated.
599 *
600 * Return: Positive if the value is changed, zero if it's not changed, or a
601 * negative error code.
602 */
603int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
604{
605 int changed = 0;
606 if (snd_BUG_ON(snd_interval_empty(i)))
607 return -EINVAL;
608 if (i->min < v->min) {
609 i->min = v->min;
610 i->openmin = v->openmin;
611 changed = 1;
612 } else if (i->min == v->min && !i->openmin && v->openmin) {
613 i->openmin = 1;
614 changed = 1;
615 }
616 if (i->max > v->max) {
617 i->max = v->max;
618 i->openmax = v->openmax;
619 changed = 1;
620 } else if (i->max == v->max && !i->openmax && v->openmax) {
621 i->openmax = 1;
622 changed = 1;
623 }
624 if (!i->integer && v->integer) {
625 i->integer = 1;
626 changed = 1;
627 }
628 if (i->integer) {
629 if (i->openmin) {
630 i->min++;
631 i->openmin = 0;
632 }
633 if (i->openmax) {
634 i->max--;
635 i->openmax = 0;
636 }
637 } else if (!i->openmin && !i->openmax && i->min == i->max)
638 i->integer = 1;
639 if (snd_interval_checkempty(i)) {
640 snd_interval_none(i);
641 return -EINVAL;
642 }
643 return changed;
644}
645
646EXPORT_SYMBOL(snd_interval_refine);
647
648static int snd_interval_refine_first(struct snd_interval *i)
649{
650 if (snd_BUG_ON(snd_interval_empty(i)))
651 return -EINVAL;
652 if (snd_interval_single(i))
653 return 0;
654 i->max = i->min;
655 i->openmax = i->openmin;
656 if (i->openmax)
657 i->max++;
658 return 1;
659}
660
661static int snd_interval_refine_last(struct snd_interval *i)
662{
663 if (snd_BUG_ON(snd_interval_empty(i)))
664 return -EINVAL;
665 if (snd_interval_single(i))
666 return 0;
667 i->min = i->max;
668 i->openmin = i->openmax;
669 if (i->openmin)
670 i->min--;
671 return 1;
672}
673
674void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
675{
676 if (a->empty || b->empty) {
677 snd_interval_none(c);
678 return;
679 }
680 c->empty = 0;
681 c->min = mul(a->min, b->min);
682 c->openmin = (a->openmin || b->openmin);
683 c->max = mul(a->max, b->max);
684 c->openmax = (a->openmax || b->openmax);
685 c->integer = (a->integer && b->integer);
686}
687
688/**
689 * snd_interval_div - refine the interval value with division
690 * @a: dividend
691 * @b: divisor
692 * @c: quotient
693 *
694 * c = a / b
695 *
696 * Returns non-zero if the value is changed, zero if not changed.
697 */
698void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
699{
700 unsigned int r;
701 if (a->empty || b->empty) {
702 snd_interval_none(c);
703 return;
704 }
705 c->empty = 0;
706 c->min = div32(a->min, b->max, &r);
707 c->openmin = (r || a->openmin || b->openmax);
708 if (b->min > 0) {
709 c->max = div32(a->max, b->min, &r);
710 if (r) {
711 c->max++;
712 c->openmax = 1;
713 } else
714 c->openmax = (a->openmax || b->openmin);
715 } else {
716 c->max = UINT_MAX;
717 c->openmax = 0;
718 }
719 c->integer = 0;
720}
721
722/**
723 * snd_interval_muldivk - refine the interval value
724 * @a: dividend 1
725 * @b: dividend 2
726 * @k: divisor (as integer)
727 * @c: result
728 *
729 * c = a * b / k
730 *
731 * Returns non-zero if the value is changed, zero if not changed.
732 */
733void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
734 unsigned int k, struct snd_interval *c)
735{
736 unsigned int r;
737 if (a->empty || b->empty) {
738 snd_interval_none(c);
739 return;
740 }
741 c->empty = 0;
742 c->min = muldiv32(a->min, b->min, k, &r);
743 c->openmin = (r || a->openmin || b->openmin);
744 c->max = muldiv32(a->max, b->max, k, &r);
745 if (r) {
746 c->max++;
747 c->openmax = 1;
748 } else
749 c->openmax = (a->openmax || b->openmax);
750 c->integer = 0;
751}
752
753/**
754 * snd_interval_mulkdiv - refine the interval value
755 * @a: dividend 1
756 * @k: dividend 2 (as integer)
757 * @b: divisor
758 * @c: result
759 *
760 * c = a * k / b
761 *
762 * Returns non-zero if the value is changed, zero if not changed.
763 */
764void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
765 const struct snd_interval *b, struct snd_interval *c)
766{
767 unsigned int r;
768 if (a->empty || b->empty) {
769 snd_interval_none(c);
770 return;
771 }
772 c->empty = 0;
773 c->min = muldiv32(a->min, k, b->max, &r);
774 c->openmin = (r || a->openmin || b->openmax);
775 if (b->min > 0) {
776 c->max = muldiv32(a->max, k, b->min, &r);
777 if (r) {
778 c->max++;
779 c->openmax = 1;
780 } else
781 c->openmax = (a->openmax || b->openmin);
782 } else {
783 c->max = UINT_MAX;
784 c->openmax = 0;
785 }
786 c->integer = 0;
787}
788
789/* ---- */
790
791
792/**
793 * snd_interval_ratnum - refine the interval value
794 * @i: interval to refine
795 * @rats_count: number of ratnum_t
796 * @rats: ratnum_t array
797 * @nump: pointer to store the resultant numerator
798 * @denp: pointer to store the resultant denominator
799 *
800 * Return: Positive if the value is changed, zero if it's not changed, or a
801 * negative error code.
802 */
803int snd_interval_ratnum(struct snd_interval *i,
804 unsigned int rats_count, const struct snd_ratnum *rats,
805 unsigned int *nump, unsigned int *denp)
806{
807 unsigned int best_num, best_den;
808 int best_diff;
809 unsigned int k;
810 struct snd_interval t;
811 int err;
812 unsigned int result_num, result_den;
813 int result_diff;
814
815 best_num = best_den = best_diff = 0;
816 for (k = 0; k < rats_count; ++k) {
817 unsigned int num = rats[k].num;
818 unsigned int den;
819 unsigned int q = i->min;
820 int diff;
821 if (q == 0)
822 q = 1;
823 den = div_up(num, q);
824 if (den < rats[k].den_min)
825 continue;
826 if (den > rats[k].den_max)
827 den = rats[k].den_max;
828 else {
829 unsigned int r;
830 r = (den - rats[k].den_min) % rats[k].den_step;
831 if (r != 0)
832 den -= r;
833 }
834 diff = num - q * den;
835 if (diff < 0)
836 diff = -diff;
837 if (best_num == 0 ||
838 diff * best_den < best_diff * den) {
839 best_diff = diff;
840 best_den = den;
841 best_num = num;
842 }
843 }
844 if (best_den == 0) {
845 i->empty = 1;
846 return -EINVAL;
847 }
848 t.min = div_down(best_num, best_den);
849 t.openmin = !!(best_num % best_den);
850
851 result_num = best_num;
852 result_diff = best_diff;
853 result_den = best_den;
854 best_num = best_den = best_diff = 0;
855 for (k = 0; k < rats_count; ++k) {
856 unsigned int num = rats[k].num;
857 unsigned int den;
858 unsigned int q = i->max;
859 int diff;
860 if (q == 0) {
861 i->empty = 1;
862 return -EINVAL;
863 }
864 den = div_down(num, q);
865 if (den > rats[k].den_max)
866 continue;
867 if (den < rats[k].den_min)
868 den = rats[k].den_min;
869 else {
870 unsigned int r;
871 r = (den - rats[k].den_min) % rats[k].den_step;
872 if (r != 0)
873 den += rats[k].den_step - r;
874 }
875 diff = q * den - num;
876 if (diff < 0)
877 diff = -diff;
878 if (best_num == 0 ||
879 diff * best_den < best_diff * den) {
880 best_diff = diff;
881 best_den = den;
882 best_num = num;
883 }
884 }
885 if (best_den == 0) {
886 i->empty = 1;
887 return -EINVAL;
888 }
889 t.max = div_up(best_num, best_den);
890 t.openmax = !!(best_num % best_den);
891 t.integer = 0;
892 err = snd_interval_refine(i, &t);
893 if (err < 0)
894 return err;
895
896 if (snd_interval_single(i)) {
897 if (best_diff * result_den < result_diff * best_den) {
898 result_num = best_num;
899 result_den = best_den;
900 }
901 if (nump)
902 *nump = result_num;
903 if (denp)
904 *denp = result_den;
905 }
906 return err;
907}
908
909EXPORT_SYMBOL(snd_interval_ratnum);
910
911/**
912 * snd_interval_ratden - refine the interval value
913 * @i: interval to refine
914 * @rats_count: number of struct ratden
915 * @rats: struct ratden array
916 * @nump: pointer to store the resultant numerator
917 * @denp: pointer to store the resultant denominator
918 *
919 * Return: Positive if the value is changed, zero if it's not changed, or a
920 * negative error code.
921 */
922static int snd_interval_ratden(struct snd_interval *i,
923 unsigned int rats_count,
924 const struct snd_ratden *rats,
925 unsigned int *nump, unsigned int *denp)
926{
927 unsigned int best_num, best_diff, best_den;
928 unsigned int k;
929 struct snd_interval t;
930 int err;
931
932 best_num = best_den = best_diff = 0;
933 for (k = 0; k < rats_count; ++k) {
934 unsigned int num;
935 unsigned int den = rats[k].den;
936 unsigned int q = i->min;
937 int diff;
938 num = mul(q, den);
939 if (num > rats[k].num_max)
940 continue;
941 if (num < rats[k].num_min)
942 num = rats[k].num_max;
943 else {
944 unsigned int r;
945 r = (num - rats[k].num_min) % rats[k].num_step;
946 if (r != 0)
947 num += rats[k].num_step - r;
948 }
949 diff = num - q * den;
950 if (best_num == 0 ||
951 diff * best_den < best_diff * den) {
952 best_diff = diff;
953 best_den = den;
954 best_num = num;
955 }
956 }
957 if (best_den == 0) {
958 i->empty = 1;
959 return -EINVAL;
960 }
961 t.min = div_down(best_num, best_den);
962 t.openmin = !!(best_num % best_den);
963
964 best_num = best_den = best_diff = 0;
965 for (k = 0; k < rats_count; ++k) {
966 unsigned int num;
967 unsigned int den = rats[k].den;
968 unsigned int q = i->max;
969 int diff;
970 num = mul(q, den);
971 if (num < rats[k].num_min)
972 continue;
973 if (num > rats[k].num_max)
974 num = rats[k].num_max;
975 else {
976 unsigned int r;
977 r = (num - rats[k].num_min) % rats[k].num_step;
978 if (r != 0)
979 num -= r;
980 }
981 diff = q * den - num;
982 if (best_num == 0 ||
983 diff * best_den < best_diff * den) {
984 best_diff = diff;
985 best_den = den;
986 best_num = num;
987 }
988 }
989 if (best_den == 0) {
990 i->empty = 1;
991 return -EINVAL;
992 }
993 t.max = div_up(best_num, best_den);
994 t.openmax = !!(best_num % best_den);
995 t.integer = 0;
996 err = snd_interval_refine(i, &t);
997 if (err < 0)
998 return err;
999
1000 if (snd_interval_single(i)) {
1001 if (nump)
1002 *nump = best_num;
1003 if (denp)
1004 *denp = best_den;
1005 }
1006 return err;
1007}
1008
1009/**
1010 * snd_interval_list - refine the interval value from the list
1011 * @i: the interval value to refine
1012 * @count: the number of elements in the list
1013 * @list: the value list
1014 * @mask: the bit-mask to evaluate
1015 *
1016 * Refines the interval value from the list.
1017 * When mask is non-zero, only the elements corresponding to bit 1 are
1018 * evaluated.
1019 *
1020 * Return: Positive if the value is changed, zero if it's not changed, or a
1021 * negative error code.
1022 */
1023int snd_interval_list(struct snd_interval *i, unsigned int count,
1024 const unsigned int *list, unsigned int mask)
1025{
1026 unsigned int k;
1027 struct snd_interval list_range;
1028
1029 if (!count) {
1030 i->empty = 1;
1031 return -EINVAL;
1032 }
1033 snd_interval_any(&list_range);
1034 list_range.min = UINT_MAX;
1035 list_range.max = 0;
1036 for (k = 0; k < count; k++) {
1037 if (mask && !(mask & (1 << k)))
1038 continue;
1039 if (!snd_interval_test(i, list[k]))
1040 continue;
1041 list_range.min = min(list_range.min, list[k]);
1042 list_range.max = max(list_range.max, list[k]);
1043 }
1044 return snd_interval_refine(i, &list_range);
1045}
1046
1047EXPORT_SYMBOL(snd_interval_list);
1048
1049/**
1050 * snd_interval_ranges - refine the interval value from the list of ranges
1051 * @i: the interval value to refine
1052 * @count: the number of elements in the list of ranges
1053 * @ranges: the ranges list
1054 * @mask: the bit-mask to evaluate
1055 *
1056 * Refines the interval value from the list of ranges.
1057 * When mask is non-zero, only the elements corresponding to bit 1 are
1058 * evaluated.
1059 *
1060 * Return: Positive if the value is changed, zero if it's not changed, or a
1061 * negative error code.
1062 */
1063int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1064 const struct snd_interval *ranges, unsigned int mask)
1065{
1066 unsigned int k;
1067 struct snd_interval range_union;
1068 struct snd_interval range;
1069
1070 if (!count) {
1071 snd_interval_none(i);
1072 return -EINVAL;
1073 }
1074 snd_interval_any(&range_union);
1075 range_union.min = UINT_MAX;
1076 range_union.max = 0;
1077 for (k = 0; k < count; k++) {
1078 if (mask && !(mask & (1 << k)))
1079 continue;
1080 snd_interval_copy(&range, &ranges[k]);
1081 if (snd_interval_refine(&range, i) < 0)
1082 continue;
1083 if (snd_interval_empty(&range))
1084 continue;
1085
1086 if (range.min < range_union.min) {
1087 range_union.min = range.min;
1088 range_union.openmin = 1;
1089 }
1090 if (range.min == range_union.min && !range.openmin)
1091 range_union.openmin = 0;
1092 if (range.max > range_union.max) {
1093 range_union.max = range.max;
1094 range_union.openmax = 1;
1095 }
1096 if (range.max == range_union.max && !range.openmax)
1097 range_union.openmax = 0;
1098 }
1099 return snd_interval_refine(i, &range_union);
1100}
1101EXPORT_SYMBOL(snd_interval_ranges);
1102
1103static int snd_interval_step(struct snd_interval *i, unsigned int step)
1104{
1105 unsigned int n;
1106 int changed = 0;
1107 n = i->min % step;
1108 if (n != 0 || i->openmin) {
1109 i->min += step - n;
1110 i->openmin = 0;
1111 changed = 1;
1112 }
1113 n = i->max % step;
1114 if (n != 0 || i->openmax) {
1115 i->max -= n;
1116 i->openmax = 0;
1117 changed = 1;
1118 }
1119 if (snd_interval_checkempty(i)) {
1120 i->empty = 1;
1121 return -EINVAL;
1122 }
1123 return changed;
1124}
1125
1126/* Info constraints helpers */
1127
1128/**
1129 * snd_pcm_hw_rule_add - add the hw-constraint rule
1130 * @runtime: the pcm runtime instance
1131 * @cond: condition bits
1132 * @var: the variable to evaluate
1133 * @func: the evaluation function
1134 * @private: the private data pointer passed to function
1135 * @dep: the dependent variables
1136 *
1137 * Return: Zero if successful, or a negative error code on failure.
1138 */
1139int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1140 int var,
1141 snd_pcm_hw_rule_func_t func, void *private,
1142 int dep, ...)
1143{
1144 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1145 struct snd_pcm_hw_rule *c;
1146 unsigned int k;
1147 va_list args;
1148 va_start(args, dep);
1149 if (constrs->rules_num >= constrs->rules_all) {
1150 struct snd_pcm_hw_rule *new;
1151 unsigned int new_rules = constrs->rules_all + 16;
1152 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1153 if (!new) {
1154 va_end(args);
1155 return -ENOMEM;
1156 }
1157 if (constrs->rules) {
1158 memcpy(new, constrs->rules,
1159 constrs->rules_num * sizeof(*c));
1160 kfree(constrs->rules);
1161 }
1162 constrs->rules = new;
1163 constrs->rules_all = new_rules;
1164 }
1165 c = &constrs->rules[constrs->rules_num];
1166 c->cond = cond;
1167 c->func = func;
1168 c->var = var;
1169 c->private = private;
1170 k = 0;
1171 while (1) {
1172 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1173 va_end(args);
1174 return -EINVAL;
1175 }
1176 c->deps[k++] = dep;
1177 if (dep < 0)
1178 break;
1179 dep = va_arg(args, int);
1180 }
1181 constrs->rules_num++;
1182 va_end(args);
1183 return 0;
1184}
1185
1186EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1187
1188/**
1189 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1190 * @runtime: PCM runtime instance
1191 * @var: hw_params variable to apply the mask
1192 * @mask: the bitmap mask
1193 *
1194 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1195 *
1196 * Return: Zero if successful, or a negative error code on failure.
1197 */
1198int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1199 u_int32_t mask)
1200{
1201 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1202 struct snd_mask *maskp = constrs_mask(constrs, var);
1203 *maskp->bits &= mask;
1204 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1205 if (*maskp->bits == 0)
1206 return -EINVAL;
1207 return 0;
1208}
1209
1210/**
1211 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1212 * @runtime: PCM runtime instance
1213 * @var: hw_params variable to apply the mask
1214 * @mask: the 64bit bitmap mask
1215 *
1216 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1217 *
1218 * Return: Zero if successful, or a negative error code on failure.
1219 */
1220int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1221 u_int64_t mask)
1222{
1223 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1224 struct snd_mask *maskp = constrs_mask(constrs, var);
1225 maskp->bits[0] &= (u_int32_t)mask;
1226 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1227 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1228 if (! maskp->bits[0] && ! maskp->bits[1])
1229 return -EINVAL;
1230 return 0;
1231}
1232EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1233
1234/**
1235 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1236 * @runtime: PCM runtime instance
1237 * @var: hw_params variable to apply the integer constraint
1238 *
1239 * Apply the constraint of integer to an interval parameter.
1240 *
1241 * Return: Positive if the value is changed, zero if it's not changed, or a
1242 * negative error code.
1243 */
1244int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1245{
1246 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1247 return snd_interval_setinteger(constrs_interval(constrs, var));
1248}
1249
1250EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1251
1252/**
1253 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1254 * @runtime: PCM runtime instance
1255 * @var: hw_params variable to apply the range
1256 * @min: the minimal value
1257 * @max: the maximal value
1258 *
1259 * Apply the min/max range constraint to an interval parameter.
1260 *
1261 * Return: Positive if the value is changed, zero if it's not changed, or a
1262 * negative error code.
1263 */
1264int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1265 unsigned int min, unsigned int max)
1266{
1267 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1268 struct snd_interval t;
1269 t.min = min;
1270 t.max = max;
1271 t.openmin = t.openmax = 0;
1272 t.integer = 0;
1273 return snd_interval_refine(constrs_interval(constrs, var), &t);
1274}
1275
1276EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1277
1278static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1279 struct snd_pcm_hw_rule *rule)
1280{
1281 struct snd_pcm_hw_constraint_list *list = rule->private;
1282 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1283}
1284
1285
1286/**
1287 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1288 * @runtime: PCM runtime instance
1289 * @cond: condition bits
1290 * @var: hw_params variable to apply the list constraint
1291 * @l: list
1292 *
1293 * Apply the list of constraints to an interval parameter.
1294 *
1295 * Return: Zero if successful, or a negative error code on failure.
1296 */
1297int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1298 unsigned int cond,
1299 snd_pcm_hw_param_t var,
1300 const struct snd_pcm_hw_constraint_list *l)
1301{
1302 return snd_pcm_hw_rule_add(runtime, cond, var,
1303 snd_pcm_hw_rule_list, (void *)l,
1304 var, -1);
1305}
1306
1307EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1308
1309static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
1310 struct snd_pcm_hw_rule *rule)
1311{
1312 struct snd_pcm_hw_constraint_ranges *r = rule->private;
1313 return snd_interval_ranges(hw_param_interval(params, rule->var),
1314 r->count, r->ranges, r->mask);
1315}
1316
1317
1318/**
1319 * snd_pcm_hw_constraint_ranges - apply list of range constraints to a parameter
1320 * @runtime: PCM runtime instance
1321 * @cond: condition bits
1322 * @var: hw_params variable to apply the list of range constraints
1323 * @r: ranges
1324 *
1325 * Apply the list of range constraints to an interval parameter.
1326 *
1327 * Return: Zero if successful, or a negative error code on failure.
1328 */
1329int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1330 unsigned int cond,
1331 snd_pcm_hw_param_t var,
1332 const struct snd_pcm_hw_constraint_ranges *r)
1333{
1334 return snd_pcm_hw_rule_add(runtime, cond, var,
1335 snd_pcm_hw_rule_ranges, (void *)r,
1336 var, -1);
1337}
1338EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
1339
1340static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1341 struct snd_pcm_hw_rule *rule)
1342{
1343 const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1344 unsigned int num = 0, den = 0;
1345 int err;
1346 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1347 r->nrats, r->rats, &num, &den);
1348 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1349 params->rate_num = num;
1350 params->rate_den = den;
1351 }
1352 return err;
1353}
1354
1355/**
1356 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1357 * @runtime: PCM runtime instance
1358 * @cond: condition bits
1359 * @var: hw_params variable to apply the ratnums constraint
1360 * @r: struct snd_ratnums constriants
1361 *
1362 * Return: Zero if successful, or a negative error code on failure.
1363 */
1364int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1365 unsigned int cond,
1366 snd_pcm_hw_param_t var,
1367 const struct snd_pcm_hw_constraint_ratnums *r)
1368{
1369 return snd_pcm_hw_rule_add(runtime, cond, var,
1370 snd_pcm_hw_rule_ratnums, (void *)r,
1371 var, -1);
1372}
1373
1374EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1375
1376static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1377 struct snd_pcm_hw_rule *rule)
1378{
1379 const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1380 unsigned int num = 0, den = 0;
1381 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1382 r->nrats, r->rats, &num, &den);
1383 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1384 params->rate_num = num;
1385 params->rate_den = den;
1386 }
1387 return err;
1388}
1389
1390/**
1391 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1392 * @runtime: PCM runtime instance
1393 * @cond: condition bits
1394 * @var: hw_params variable to apply the ratdens constraint
1395 * @r: struct snd_ratdens constriants
1396 *
1397 * Return: Zero if successful, or a negative error code on failure.
1398 */
1399int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1400 unsigned int cond,
1401 snd_pcm_hw_param_t var,
1402 const struct snd_pcm_hw_constraint_ratdens *r)
1403{
1404 return snd_pcm_hw_rule_add(runtime, cond, var,
1405 snd_pcm_hw_rule_ratdens, (void *)r,
1406 var, -1);
1407}
1408
1409EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1410
1411static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1412 struct snd_pcm_hw_rule *rule)
1413{
1414 unsigned int l = (unsigned long) rule->private;
1415 int width = l & 0xffff;
1416 unsigned int msbits = l >> 16;
1417 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1418
1419 if (!snd_interval_single(i))
1420 return 0;
1421
1422 if ((snd_interval_value(i) == width) ||
1423 (width == 0 && snd_interval_value(i) > msbits))
1424 params->msbits = min_not_zero(params->msbits, msbits);
1425
1426 return 0;
1427}
1428
1429/**
1430 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1431 * @runtime: PCM runtime instance
1432 * @cond: condition bits
1433 * @width: sample bits width
1434 * @msbits: msbits width
1435 *
1436 * This constraint will set the number of most significant bits (msbits) if a
1437 * sample format with the specified width has been select. If width is set to 0
1438 * the msbits will be set for any sample format with a width larger than the
1439 * specified msbits.
1440 *
1441 * Return: Zero if successful, or a negative error code on failure.
1442 */
1443int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1444 unsigned int cond,
1445 unsigned int width,
1446 unsigned int msbits)
1447{
1448 unsigned long l = (msbits << 16) | width;
1449 return snd_pcm_hw_rule_add(runtime, cond, -1,
1450 snd_pcm_hw_rule_msbits,
1451 (void*) l,
1452 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1453}
1454
1455EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1456
1457static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1458 struct snd_pcm_hw_rule *rule)
1459{
1460 unsigned long step = (unsigned long) rule->private;
1461 return snd_interval_step(hw_param_interval(params, rule->var), step);
1462}
1463
1464/**
1465 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1466 * @runtime: PCM runtime instance
1467 * @cond: condition bits
1468 * @var: hw_params variable to apply the step constraint
1469 * @step: step size
1470 *
1471 * Return: Zero if successful, or a negative error code on failure.
1472 */
1473int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1474 unsigned int cond,
1475 snd_pcm_hw_param_t var,
1476 unsigned long step)
1477{
1478 return snd_pcm_hw_rule_add(runtime, cond, var,
1479 snd_pcm_hw_rule_step, (void *) step,
1480 var, -1);
1481}
1482
1483EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1484
1485static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1486{
1487 static unsigned int pow2_sizes[] = {
1488 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1489 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1490 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1491 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1492 };
1493 return snd_interval_list(hw_param_interval(params, rule->var),
1494 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1495}
1496
1497/**
1498 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1499 * @runtime: PCM runtime instance
1500 * @cond: condition bits
1501 * @var: hw_params variable to apply the power-of-2 constraint
1502 *
1503 * Return: Zero if successful, or a negative error code on failure.
1504 */
1505int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1506 unsigned int cond,
1507 snd_pcm_hw_param_t var)
1508{
1509 return snd_pcm_hw_rule_add(runtime, cond, var,
1510 snd_pcm_hw_rule_pow2, NULL,
1511 var, -1);
1512}
1513
1514EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1515
1516static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1517 struct snd_pcm_hw_rule *rule)
1518{
1519 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1520 struct snd_interval *rate;
1521
1522 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1523 return snd_interval_list(rate, 1, &base_rate, 0);
1524}
1525
1526/**
1527 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1528 * @runtime: PCM runtime instance
1529 * @base_rate: the rate at which the hardware does not resample
1530 *
1531 * Return: Zero if successful, or a negative error code on failure.
1532 */
1533int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1534 unsigned int base_rate)
1535{
1536 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1537 SNDRV_PCM_HW_PARAM_RATE,
1538 snd_pcm_hw_rule_noresample_func,
1539 (void *)(uintptr_t)base_rate,
1540 SNDRV_PCM_HW_PARAM_RATE, -1);
1541}
1542EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1543
1544static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1545 snd_pcm_hw_param_t var)
1546{
1547 if (hw_is_mask(var)) {
1548 snd_mask_any(hw_param_mask(params, var));
1549 params->cmask |= 1 << var;
1550 params->rmask |= 1 << var;
1551 return;
1552 }
1553 if (hw_is_interval(var)) {
1554 snd_interval_any(hw_param_interval(params, var));
1555 params->cmask |= 1 << var;
1556 params->rmask |= 1 << var;
1557 return;
1558 }
1559 snd_BUG();
1560}
1561
1562void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1563{
1564 unsigned int k;
1565 memset(params, 0, sizeof(*params));
1566 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1567 _snd_pcm_hw_param_any(params, k);
1568 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1569 _snd_pcm_hw_param_any(params, k);
1570 params->info = ~0U;
1571}
1572
1573EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1574
1575/**
1576 * snd_pcm_hw_param_value - return @params field @var value
1577 * @params: the hw_params instance
1578 * @var: parameter to retrieve
1579 * @dir: pointer to the direction (-1,0,1) or %NULL
1580 *
1581 * Return: The value for field @var if it's fixed in configuration space
1582 * defined by @params. -%EINVAL otherwise.
1583 */
1584int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1585 snd_pcm_hw_param_t var, int *dir)
1586{
1587 if (hw_is_mask(var)) {
1588 const struct snd_mask *mask = hw_param_mask_c(params, var);
1589 if (!snd_mask_single(mask))
1590 return -EINVAL;
1591 if (dir)
1592 *dir = 0;
1593 return snd_mask_value(mask);
1594 }
1595 if (hw_is_interval(var)) {
1596 const struct snd_interval *i = hw_param_interval_c(params, var);
1597 if (!snd_interval_single(i))
1598 return -EINVAL;
1599 if (dir)
1600 *dir = i->openmin;
1601 return snd_interval_value(i);
1602 }
1603 return -EINVAL;
1604}
1605
1606EXPORT_SYMBOL(snd_pcm_hw_param_value);
1607
1608void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1609 snd_pcm_hw_param_t var)
1610{
1611 if (hw_is_mask(var)) {
1612 snd_mask_none(hw_param_mask(params, var));
1613 params->cmask |= 1 << var;
1614 params->rmask |= 1 << var;
1615 } else if (hw_is_interval(var)) {
1616 snd_interval_none(hw_param_interval(params, var));
1617 params->cmask |= 1 << var;
1618 params->rmask |= 1 << var;
1619 } else {
1620 snd_BUG();
1621 }
1622}
1623
1624EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1625
1626static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1627 snd_pcm_hw_param_t var)
1628{
1629 int changed;
1630 if (hw_is_mask(var))
1631 changed = snd_mask_refine_first(hw_param_mask(params, var));
1632 else if (hw_is_interval(var))
1633 changed = snd_interval_refine_first(hw_param_interval(params, var));
1634 else
1635 return -EINVAL;
1636 if (changed) {
1637 params->cmask |= 1 << var;
1638 params->rmask |= 1 << var;
1639 }
1640 return changed;
1641}
1642
1643
1644/**
1645 * snd_pcm_hw_param_first - refine config space and return minimum value
1646 * @pcm: PCM instance
1647 * @params: the hw_params instance
1648 * @var: parameter to retrieve
1649 * @dir: pointer to the direction (-1,0,1) or %NULL
1650 *
1651 * Inside configuration space defined by @params remove from @var all
1652 * values > minimum. Reduce configuration space accordingly.
1653 *
1654 * Return: The minimum, or a negative error code on failure.
1655 */
1656int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1657 struct snd_pcm_hw_params *params,
1658 snd_pcm_hw_param_t var, int *dir)
1659{
1660 int changed = _snd_pcm_hw_param_first(params, var);
1661 if (changed < 0)
1662 return changed;
1663 if (params->rmask) {
1664 int err = snd_pcm_hw_refine(pcm, params);
1665 if (snd_BUG_ON(err < 0))
1666 return err;
1667 }
1668 return snd_pcm_hw_param_value(params, var, dir);
1669}
1670
1671EXPORT_SYMBOL(snd_pcm_hw_param_first);
1672
1673static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1674 snd_pcm_hw_param_t var)
1675{
1676 int changed;
1677 if (hw_is_mask(var))
1678 changed = snd_mask_refine_last(hw_param_mask(params, var));
1679 else if (hw_is_interval(var))
1680 changed = snd_interval_refine_last(hw_param_interval(params, var));
1681 else
1682 return -EINVAL;
1683 if (changed) {
1684 params->cmask |= 1 << var;
1685 params->rmask |= 1 << var;
1686 }
1687 return changed;
1688}
1689
1690
1691/**
1692 * snd_pcm_hw_param_last - refine config space and return maximum value
1693 * @pcm: PCM instance
1694 * @params: the hw_params instance
1695 * @var: parameter to retrieve
1696 * @dir: pointer to the direction (-1,0,1) or %NULL
1697 *
1698 * Inside configuration space defined by @params remove from @var all
1699 * values < maximum. Reduce configuration space accordingly.
1700 *
1701 * Return: The maximum, or a negative error code on failure.
1702 */
1703int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1704 struct snd_pcm_hw_params *params,
1705 snd_pcm_hw_param_t var, int *dir)
1706{
1707 int changed = _snd_pcm_hw_param_last(params, var);
1708 if (changed < 0)
1709 return changed;
1710 if (params->rmask) {
1711 int err = snd_pcm_hw_refine(pcm, params);
1712 if (snd_BUG_ON(err < 0))
1713 return err;
1714 }
1715 return snd_pcm_hw_param_value(params, var, dir);
1716}
1717
1718EXPORT_SYMBOL(snd_pcm_hw_param_last);
1719
1720/**
1721 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1722 * @pcm: PCM instance
1723 * @params: the hw_params instance
1724 *
1725 * Choose one configuration from configuration space defined by @params.
1726 * The configuration chosen is that obtained fixing in this order:
1727 * first access, first format, first subformat, min channels,
1728 * min rate, min period time, max buffer size, min tick time
1729 *
1730 * Return: Zero if successful, or a negative error code on failure.
1731 */
1732int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1733 struct snd_pcm_hw_params *params)
1734{
1735 static int vars[] = {
1736 SNDRV_PCM_HW_PARAM_ACCESS,
1737 SNDRV_PCM_HW_PARAM_FORMAT,
1738 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1739 SNDRV_PCM_HW_PARAM_CHANNELS,
1740 SNDRV_PCM_HW_PARAM_RATE,
1741 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1742 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1743 SNDRV_PCM_HW_PARAM_TICK_TIME,
1744 -1
1745 };
1746 int err, *v;
1747
1748 for (v = vars; *v != -1; v++) {
1749 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1750 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1751 else
1752 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1753 if (snd_BUG_ON(err < 0))
1754 return err;
1755 }
1756 return 0;
1757}
1758
1759static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1760 void *arg)
1761{
1762 struct snd_pcm_runtime *runtime = substream->runtime;
1763 unsigned long flags;
1764 snd_pcm_stream_lock_irqsave(substream, flags);
1765 if (snd_pcm_running(substream) &&
1766 snd_pcm_update_hw_ptr(substream) >= 0)
1767 runtime->status->hw_ptr %= runtime->buffer_size;
1768 else {
1769 runtime->status->hw_ptr = 0;
1770 runtime->hw_ptr_wrap = 0;
1771 }
1772 snd_pcm_stream_unlock_irqrestore(substream, flags);
1773 return 0;
1774}
1775
1776static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1777 void *arg)
1778{
1779 struct snd_pcm_channel_info *info = arg;
1780 struct snd_pcm_runtime *runtime = substream->runtime;
1781 int width;
1782 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1783 info->offset = -1;
1784 return 0;
1785 }
1786 width = snd_pcm_format_physical_width(runtime->format);
1787 if (width < 0)
1788 return width;
1789 info->offset = 0;
1790 switch (runtime->access) {
1791 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1792 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1793 info->first = info->channel * width;
1794 info->step = runtime->channels * width;
1795 break;
1796 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1797 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1798 {
1799 size_t size = runtime->dma_bytes / runtime->channels;
1800 info->first = info->channel * size * 8;
1801 info->step = width;
1802 break;
1803 }
1804 default:
1805 snd_BUG();
1806 break;
1807 }
1808 return 0;
1809}
1810
1811static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1812 void *arg)
1813{
1814 struct snd_pcm_hw_params *params = arg;
1815 snd_pcm_format_t format;
1816 int channels;
1817 ssize_t frame_size;
1818
1819 params->fifo_size = substream->runtime->hw.fifo_size;
1820 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1821 format = params_format(params);
1822 channels = params_channels(params);
1823 frame_size = snd_pcm_format_size(format, channels);
1824 if (frame_size > 0)
1825 params->fifo_size /= (unsigned)frame_size;
1826 }
1827 return 0;
1828}
1829
1830/**
1831 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1832 * @substream: the pcm substream instance
1833 * @cmd: ioctl command
1834 * @arg: ioctl argument
1835 *
1836 * Processes the generic ioctl commands for PCM.
1837 * Can be passed as the ioctl callback for PCM ops.
1838 *
1839 * Return: Zero if successful, or a negative error code on failure.
1840 */
1841int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1842 unsigned int cmd, void *arg)
1843{
1844 switch (cmd) {
1845 case SNDRV_PCM_IOCTL1_INFO:
1846 return 0;
1847 case SNDRV_PCM_IOCTL1_RESET:
1848 return snd_pcm_lib_ioctl_reset(substream, arg);
1849 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1850 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1851 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1852 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1853 }
1854 return -ENXIO;
1855}
1856
1857EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1858
1859/**
1860 * snd_pcm_period_elapsed - update the pcm status for the next period
1861 * @substream: the pcm substream instance
1862 *
1863 * This function is called from the interrupt handler when the
1864 * PCM has processed the period size. It will update the current
1865 * pointer, wake up sleepers, etc.
1866 *
1867 * Even if more than one periods have elapsed since the last call, you
1868 * have to call this only once.
1869 */
1870void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1871{
1872 struct snd_pcm_runtime *runtime;
1873 unsigned long flags;
1874
1875 if (PCM_RUNTIME_CHECK(substream))
1876 return;
1877 runtime = substream->runtime;
1878
1879 snd_pcm_stream_lock_irqsave(substream, flags);
1880 if (!snd_pcm_running(substream) ||
1881 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1882 goto _end;
1883
1884#ifdef CONFIG_SND_PCM_TIMER
1885 if (substream->timer_running)
1886 snd_timer_interrupt(substream->timer, 1);
1887#endif
1888 _end:
1889 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1890 snd_pcm_stream_unlock_irqrestore(substream, flags);
1891}
1892
1893EXPORT_SYMBOL(snd_pcm_period_elapsed);
1894
1895/*
1896 * Wait until avail_min data becomes available
1897 * Returns a negative error code if any error occurs during operation.
1898 * The available space is stored on availp. When err = 0 and avail = 0
1899 * on the capture stream, it indicates the stream is in DRAINING state.
1900 */
1901static int wait_for_avail(struct snd_pcm_substream *substream,
1902 snd_pcm_uframes_t *availp)
1903{
1904 struct snd_pcm_runtime *runtime = substream->runtime;
1905 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1906 wait_queue_t wait;
1907 int err = 0;
1908 snd_pcm_uframes_t avail = 0;
1909 long wait_time, tout;
1910
1911 init_waitqueue_entry(&wait, current);
1912 set_current_state(TASK_INTERRUPTIBLE);
1913 add_wait_queue(&runtime->tsleep, &wait);
1914
1915 if (runtime->no_period_wakeup)
1916 wait_time = MAX_SCHEDULE_TIMEOUT;
1917 else {
1918 wait_time = 10;
1919 if (runtime->rate) {
1920 long t = runtime->period_size * 2 / runtime->rate;
1921 wait_time = max(t, wait_time);
1922 }
1923 wait_time = msecs_to_jiffies(wait_time * 1000);
1924 }
1925
1926 for (;;) {
1927 if (signal_pending(current)) {
1928 err = -ERESTARTSYS;
1929 break;
1930 }
1931
1932 /*
1933 * We need to check if space became available already
1934 * (and thus the wakeup happened already) first to close
1935 * the race of space already having become available.
1936 * This check must happen after been added to the waitqueue
1937 * and having current state be INTERRUPTIBLE.
1938 */
1939 if (is_playback)
1940 avail = snd_pcm_playback_avail(runtime);
1941 else
1942 avail = snd_pcm_capture_avail(runtime);
1943 if (avail >= runtime->twake)
1944 break;
1945 snd_pcm_stream_unlock_irq(substream);
1946
1947 tout = schedule_timeout(wait_time);
1948
1949 snd_pcm_stream_lock_irq(substream);
1950 set_current_state(TASK_INTERRUPTIBLE);
1951 switch (runtime->status->state) {
1952 case SNDRV_PCM_STATE_SUSPENDED:
1953 err = -ESTRPIPE;
1954 goto _endloop;
1955 case SNDRV_PCM_STATE_XRUN:
1956 err = -EPIPE;
1957 goto _endloop;
1958 case SNDRV_PCM_STATE_DRAINING:
1959 if (is_playback)
1960 err = -EPIPE;
1961 else
1962 avail = 0; /* indicate draining */
1963 goto _endloop;
1964 case SNDRV_PCM_STATE_OPEN:
1965 case SNDRV_PCM_STATE_SETUP:
1966 case SNDRV_PCM_STATE_DISCONNECTED:
1967 err = -EBADFD;
1968 goto _endloop;
1969 case SNDRV_PCM_STATE_PAUSED:
1970 continue;
1971 }
1972 if (!tout) {
1973 pcm_dbg(substream->pcm,
1974 "%s write error (DMA or IRQ trouble?)\n",
1975 is_playback ? "playback" : "capture");
1976 err = -EIO;
1977 break;
1978 }
1979 }
1980 _endloop:
1981 set_current_state(TASK_RUNNING);
1982 remove_wait_queue(&runtime->tsleep, &wait);
1983 *availp = avail;
1984 return err;
1985}
1986
1987static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1988 unsigned int hwoff,
1989 unsigned long data, unsigned int off,
1990 snd_pcm_uframes_t frames)
1991{
1992 struct snd_pcm_runtime *runtime = substream->runtime;
1993 int err;
1994 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1995 if (substream->ops->copy) {
1996 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1997 return err;
1998 } else {
1999 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2000 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
2001 return -EFAULT;
2002 }
2003 return 0;
2004}
2005
2006typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
2007 unsigned long data, unsigned int off,
2008 snd_pcm_uframes_t size);
2009
2010static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
2011 unsigned long data,
2012 snd_pcm_uframes_t size,
2013 int nonblock,
2014 transfer_f transfer)
2015{
2016 struct snd_pcm_runtime *runtime = substream->runtime;
2017 snd_pcm_uframes_t xfer = 0;
2018 snd_pcm_uframes_t offset = 0;
2019 snd_pcm_uframes_t avail;
2020 int err = 0;
2021
2022 if (size == 0)
2023 return 0;
2024
2025 snd_pcm_stream_lock_irq(substream);
2026 switch (runtime->status->state) {
2027 case SNDRV_PCM_STATE_PREPARED:
2028 case SNDRV_PCM_STATE_RUNNING:
2029 case SNDRV_PCM_STATE_PAUSED:
2030 break;
2031 case SNDRV_PCM_STATE_XRUN:
2032 err = -EPIPE;
2033 goto _end_unlock;
2034 case SNDRV_PCM_STATE_SUSPENDED:
2035 err = -ESTRPIPE;
2036 goto _end_unlock;
2037 default:
2038 err = -EBADFD;
2039 goto _end_unlock;
2040 }
2041
2042 runtime->twake = runtime->control->avail_min ? : 1;
2043 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2044 snd_pcm_update_hw_ptr(substream);
2045 avail = snd_pcm_playback_avail(runtime);
2046 while (size > 0) {
2047 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2048 snd_pcm_uframes_t cont;
2049 if (!avail) {
2050 if (nonblock) {
2051 err = -EAGAIN;
2052 goto _end_unlock;
2053 }
2054 runtime->twake = min_t(snd_pcm_uframes_t, size,
2055 runtime->control->avail_min ? : 1);
2056 err = wait_for_avail(substream, &avail);
2057 if (err < 0)
2058 goto _end_unlock;
2059 }
2060 frames = size > avail ? avail : size;
2061 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2062 if (frames > cont)
2063 frames = cont;
2064 if (snd_BUG_ON(!frames)) {
2065 runtime->twake = 0;
2066 snd_pcm_stream_unlock_irq(substream);
2067 return -EINVAL;
2068 }
2069 appl_ptr = runtime->control->appl_ptr;
2070 appl_ofs = appl_ptr % runtime->buffer_size;
2071 snd_pcm_stream_unlock_irq(substream);
2072 err = transfer(substream, appl_ofs, data, offset, frames);
2073 snd_pcm_stream_lock_irq(substream);
2074 if (err < 0)
2075 goto _end_unlock;
2076 switch (runtime->status->state) {
2077 case SNDRV_PCM_STATE_XRUN:
2078 err = -EPIPE;
2079 goto _end_unlock;
2080 case SNDRV_PCM_STATE_SUSPENDED:
2081 err = -ESTRPIPE;
2082 goto _end_unlock;
2083 default:
2084 break;
2085 }
2086 appl_ptr += frames;
2087 if (appl_ptr >= runtime->boundary)
2088 appl_ptr -= runtime->boundary;
2089 runtime->control->appl_ptr = appl_ptr;
2090 if (substream->ops->ack)
2091 substream->ops->ack(substream);
2092
2093 offset += frames;
2094 size -= frames;
2095 xfer += frames;
2096 avail -= frames;
2097 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2098 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2099 err = snd_pcm_start(substream);
2100 if (err < 0)
2101 goto _end_unlock;
2102 }
2103 }
2104 _end_unlock:
2105 runtime->twake = 0;
2106 if (xfer > 0 && err >= 0)
2107 snd_pcm_update_state(substream, runtime);
2108 snd_pcm_stream_unlock_irq(substream);
2109 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2110}
2111
2112/* sanity-check for read/write methods */
2113static int pcm_sanity_check(struct snd_pcm_substream *substream)
2114{
2115 struct snd_pcm_runtime *runtime;
2116 if (PCM_RUNTIME_CHECK(substream))
2117 return -ENXIO;
2118 runtime = substream->runtime;
2119 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
2120 return -EINVAL;
2121 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2122 return -EBADFD;
2123 return 0;
2124}
2125
2126snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2127{
2128 struct snd_pcm_runtime *runtime;
2129 int nonblock;
2130 int err;
2131
2132 err = pcm_sanity_check(substream);
2133 if (err < 0)
2134 return err;
2135 runtime = substream->runtime;
2136 nonblock = !!(substream->f_flags & O_NONBLOCK);
2137
2138 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2139 runtime->channels > 1)
2140 return -EINVAL;
2141 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2142 snd_pcm_lib_write_transfer);
2143}
2144
2145EXPORT_SYMBOL(snd_pcm_lib_write);
2146
2147static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
2148 unsigned int hwoff,
2149 unsigned long data, unsigned int off,
2150 snd_pcm_uframes_t frames)
2151{
2152 struct snd_pcm_runtime *runtime = substream->runtime;
2153 int err;
2154 void __user **bufs = (void __user **)data;
2155 int channels = runtime->channels;
2156 int c;
2157 if (substream->ops->copy) {
2158 if (snd_BUG_ON(!substream->ops->silence))
2159 return -EINVAL;
2160 for (c = 0; c < channels; ++c, ++bufs) {
2161 if (*bufs == NULL) {
2162 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2163 return err;
2164 } else {
2165 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2166 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2167 return err;
2168 }
2169 }
2170 } else {
2171 /* default transfer behaviour */
2172 size_t dma_csize = runtime->dma_bytes / channels;
2173 for (c = 0; c < channels; ++c, ++bufs) {
2174 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2175 if (*bufs == NULL) {
2176 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2177 } else {
2178 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2179 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2180 return -EFAULT;
2181 }
2182 }
2183 }
2184 return 0;
2185}
2186
2187snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2188 void __user **bufs,
2189 snd_pcm_uframes_t frames)
2190{
2191 struct snd_pcm_runtime *runtime;
2192 int nonblock;
2193 int err;
2194
2195 err = pcm_sanity_check(substream);
2196 if (err < 0)
2197 return err;
2198 runtime = substream->runtime;
2199 nonblock = !!(substream->f_flags & O_NONBLOCK);
2200
2201 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2202 return -EINVAL;
2203 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2204 nonblock, snd_pcm_lib_writev_transfer);
2205}
2206
2207EXPORT_SYMBOL(snd_pcm_lib_writev);
2208
2209static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2210 unsigned int hwoff,
2211 unsigned long data, unsigned int off,
2212 snd_pcm_uframes_t frames)
2213{
2214 struct snd_pcm_runtime *runtime = substream->runtime;
2215 int err;
2216 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2217 if (substream->ops->copy) {
2218 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2219 return err;
2220 } else {
2221 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2222 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2223 return -EFAULT;
2224 }
2225 return 0;
2226}
2227
2228static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2229 unsigned long data,
2230 snd_pcm_uframes_t size,
2231 int nonblock,
2232 transfer_f transfer)
2233{
2234 struct snd_pcm_runtime *runtime = substream->runtime;
2235 snd_pcm_uframes_t xfer = 0;
2236 snd_pcm_uframes_t offset = 0;
2237 snd_pcm_uframes_t avail;
2238 int err = 0;
2239
2240 if (size == 0)
2241 return 0;
2242
2243 snd_pcm_stream_lock_irq(substream);
2244 switch (runtime->status->state) {
2245 case SNDRV_PCM_STATE_PREPARED:
2246 if (size >= runtime->start_threshold) {
2247 err = snd_pcm_start(substream);
2248 if (err < 0)
2249 goto _end_unlock;
2250 }
2251 break;
2252 case SNDRV_PCM_STATE_DRAINING:
2253 case SNDRV_PCM_STATE_RUNNING:
2254 case SNDRV_PCM_STATE_PAUSED:
2255 break;
2256 case SNDRV_PCM_STATE_XRUN:
2257 err = -EPIPE;
2258 goto _end_unlock;
2259 case SNDRV_PCM_STATE_SUSPENDED:
2260 err = -ESTRPIPE;
2261 goto _end_unlock;
2262 default:
2263 err = -EBADFD;
2264 goto _end_unlock;
2265 }
2266
2267 runtime->twake = runtime->control->avail_min ? : 1;
2268 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2269 snd_pcm_update_hw_ptr(substream);
2270 avail = snd_pcm_capture_avail(runtime);
2271 while (size > 0) {
2272 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2273 snd_pcm_uframes_t cont;
2274 if (!avail) {
2275 if (runtime->status->state ==
2276 SNDRV_PCM_STATE_DRAINING) {
2277 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2278 goto _end_unlock;
2279 }
2280 if (nonblock) {
2281 err = -EAGAIN;
2282 goto _end_unlock;
2283 }
2284 runtime->twake = min_t(snd_pcm_uframes_t, size,
2285 runtime->control->avail_min ? : 1);
2286 err = wait_for_avail(substream, &avail);
2287 if (err < 0)
2288 goto _end_unlock;
2289 if (!avail)
2290 continue; /* draining */
2291 }
2292 frames = size > avail ? avail : size;
2293 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2294 if (frames > cont)
2295 frames = cont;
2296 if (snd_BUG_ON(!frames)) {
2297 runtime->twake = 0;
2298 snd_pcm_stream_unlock_irq(substream);
2299 return -EINVAL;
2300 }
2301 appl_ptr = runtime->control->appl_ptr;
2302 appl_ofs = appl_ptr % runtime->buffer_size;
2303 snd_pcm_stream_unlock_irq(substream);
2304 err = transfer(substream, appl_ofs, data, offset, frames);
2305 snd_pcm_stream_lock_irq(substream);
2306 if (err < 0)
2307 goto _end_unlock;
2308 switch (runtime->status->state) {
2309 case SNDRV_PCM_STATE_XRUN:
2310 err = -EPIPE;
2311 goto _end_unlock;
2312 case SNDRV_PCM_STATE_SUSPENDED:
2313 err = -ESTRPIPE;
2314 goto _end_unlock;
2315 default:
2316 break;
2317 }
2318 appl_ptr += frames;
2319 if (appl_ptr >= runtime->boundary)
2320 appl_ptr -= runtime->boundary;
2321 runtime->control->appl_ptr = appl_ptr;
2322 if (substream->ops->ack)
2323 substream->ops->ack(substream);
2324
2325 offset += frames;
2326 size -= frames;
2327 xfer += frames;
2328 avail -= frames;
2329 }
2330 _end_unlock:
2331 runtime->twake = 0;
2332 if (xfer > 0 && err >= 0)
2333 snd_pcm_update_state(substream, runtime);
2334 snd_pcm_stream_unlock_irq(substream);
2335 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2336}
2337
2338snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2339{
2340 struct snd_pcm_runtime *runtime;
2341 int nonblock;
2342 int err;
2343
2344 err = pcm_sanity_check(substream);
2345 if (err < 0)
2346 return err;
2347 runtime = substream->runtime;
2348 nonblock = !!(substream->f_flags & O_NONBLOCK);
2349 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2350 return -EINVAL;
2351 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2352}
2353
2354EXPORT_SYMBOL(snd_pcm_lib_read);
2355
2356static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2357 unsigned int hwoff,
2358 unsigned long data, unsigned int off,
2359 snd_pcm_uframes_t frames)
2360{
2361 struct snd_pcm_runtime *runtime = substream->runtime;
2362 int err;
2363 void __user **bufs = (void __user **)data;
2364 int channels = runtime->channels;
2365 int c;
2366 if (substream->ops->copy) {
2367 for (c = 0; c < channels; ++c, ++bufs) {
2368 char __user *buf;
2369 if (*bufs == NULL)
2370 continue;
2371 buf = *bufs + samples_to_bytes(runtime, off);
2372 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2373 return err;
2374 }
2375 } else {
2376 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2377 for (c = 0; c < channels; ++c, ++bufs) {
2378 char *hwbuf;
2379 char __user *buf;
2380 if (*bufs == NULL)
2381 continue;
2382
2383 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2384 buf = *bufs + samples_to_bytes(runtime, off);
2385 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2386 return -EFAULT;
2387 }
2388 }
2389 return 0;
2390}
2391
2392snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2393 void __user **bufs,
2394 snd_pcm_uframes_t frames)
2395{
2396 struct snd_pcm_runtime *runtime;
2397 int nonblock;
2398 int err;
2399
2400 err = pcm_sanity_check(substream);
2401 if (err < 0)
2402 return err;
2403 runtime = substream->runtime;
2404 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2405 return -EBADFD;
2406
2407 nonblock = !!(substream->f_flags & O_NONBLOCK);
2408 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2409 return -EINVAL;
2410 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2411}
2412
2413EXPORT_SYMBOL(snd_pcm_lib_readv);
2414
2415/*
2416 * standard channel mapping helpers
2417 */
2418
2419/* default channel maps for multi-channel playbacks, up to 8 channels */
2420const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2421 { .channels = 1,
2422 .map = { SNDRV_CHMAP_MONO } },
2423 { .channels = 2,
2424 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2425 { .channels = 4,
2426 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2427 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2428 { .channels = 6,
2429 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2430 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2431 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2432 { .channels = 8,
2433 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2434 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2435 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2436 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2437 { }
2438};
2439EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2440
2441/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2442const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2443 { .channels = 1,
2444 .map = { SNDRV_CHMAP_MONO } },
2445 { .channels = 2,
2446 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2447 { .channels = 4,
2448 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2449 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2450 { .channels = 6,
2451 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2452 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2453 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2454 { .channels = 8,
2455 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2456 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2457 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2458 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2459 { }
2460};
2461EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2462
2463static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2464{
2465 if (ch > info->max_channels)
2466 return false;
2467 return !info->channel_mask || (info->channel_mask & (1U << ch));
2468}
2469
2470static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2471 struct snd_ctl_elem_info *uinfo)
2472{
2473 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2474
2475 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2476 uinfo->count = 0;
2477 uinfo->count = info->max_channels;
2478 uinfo->value.integer.min = 0;
2479 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2480 return 0;
2481}
2482
2483/* get callback for channel map ctl element
2484 * stores the channel position firstly matching with the current channels
2485 */
2486static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2487 struct snd_ctl_elem_value *ucontrol)
2488{
2489 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2490 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2491 struct snd_pcm_substream *substream;
2492 const struct snd_pcm_chmap_elem *map;
2493
2494 if (snd_BUG_ON(!info->chmap))
2495 return -EINVAL;
2496 substream = snd_pcm_chmap_substream(info, idx);
2497 if (!substream)
2498 return -ENODEV;
2499 memset(ucontrol->value.integer.value, 0,
2500 sizeof(ucontrol->value.integer.value));
2501 if (!substream->runtime)
2502 return 0; /* no channels set */
2503 for (map = info->chmap; map->channels; map++) {
2504 int i;
2505 if (map->channels == substream->runtime->channels &&
2506 valid_chmap_channels(info, map->channels)) {
2507 for (i = 0; i < map->channels; i++)
2508 ucontrol->value.integer.value[i] = map->map[i];
2509 return 0;
2510 }
2511 }
2512 return -EINVAL;
2513}
2514
2515/* tlv callback for channel map ctl element
2516 * expands the pre-defined channel maps in a form of TLV
2517 */
2518static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2519 unsigned int size, unsigned int __user *tlv)
2520{
2521 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2522 const struct snd_pcm_chmap_elem *map;
2523 unsigned int __user *dst;
2524 int c, count = 0;
2525
2526 if (snd_BUG_ON(!info->chmap))
2527 return -EINVAL;
2528 if (size < 8)
2529 return -ENOMEM;
2530 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2531 return -EFAULT;
2532 size -= 8;
2533 dst = tlv + 2;
2534 for (map = info->chmap; map->channels; map++) {
2535 int chs_bytes = map->channels * 4;
2536 if (!valid_chmap_channels(info, map->channels))
2537 continue;
2538 if (size < 8)
2539 return -ENOMEM;
2540 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2541 put_user(chs_bytes, dst + 1))
2542 return -EFAULT;
2543 dst += 2;
2544 size -= 8;
2545 count += 8;
2546 if (size < chs_bytes)
2547 return -ENOMEM;
2548 size -= chs_bytes;
2549 count += chs_bytes;
2550 for (c = 0; c < map->channels; c++) {
2551 if (put_user(map->map[c], dst))
2552 return -EFAULT;
2553 dst++;
2554 }
2555 }
2556 if (put_user(count, tlv + 1))
2557 return -EFAULT;
2558 return 0;
2559}
2560
2561static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2562{
2563 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2564 info->pcm->streams[info->stream].chmap_kctl = NULL;
2565 kfree(info);
2566}
2567
2568/**
2569 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2570 * @pcm: the assigned PCM instance
2571 * @stream: stream direction
2572 * @chmap: channel map elements (for query)
2573 * @max_channels: the max number of channels for the stream
2574 * @private_value: the value passed to each kcontrol's private_value field
2575 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2576 *
2577 * Create channel-mapping control elements assigned to the given PCM stream(s).
2578 * Return: Zero if successful, or a negative error value.
2579 */
2580int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2581 const struct snd_pcm_chmap_elem *chmap,
2582 int max_channels,
2583 unsigned long private_value,
2584 struct snd_pcm_chmap **info_ret)
2585{
2586 struct snd_pcm_chmap *info;
2587 struct snd_kcontrol_new knew = {
2588 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2589 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2590 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2591 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2592 .info = pcm_chmap_ctl_info,
2593 .get = pcm_chmap_ctl_get,
2594 .tlv.c = pcm_chmap_ctl_tlv,
2595 };
2596 int err;
2597
2598 if (WARN_ON(pcm->streams[stream].chmap_kctl))
2599 return -EBUSY;
2600 info = kzalloc(sizeof(*info), GFP_KERNEL);
2601 if (!info)
2602 return -ENOMEM;
2603 info->pcm = pcm;
2604 info->stream = stream;
2605 info->chmap = chmap;
2606 info->max_channels = max_channels;
2607 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2608 knew.name = "Playback Channel Map";
2609 else
2610 knew.name = "Capture Channel Map";
2611 knew.device = pcm->device;
2612 knew.count = pcm->streams[stream].substream_count;
2613 knew.private_value = private_value;
2614 info->kctl = snd_ctl_new1(&knew, info);
2615 if (!info->kctl) {
2616 kfree(info);
2617 return -ENOMEM;
2618 }
2619 info->kctl->private_free = pcm_chmap_ctl_private_free;
2620 err = snd_ctl_add(pcm->card, info->kctl);
2621 if (err < 0)
2622 return err;
2623 pcm->streams[stream].chmap_kctl = info->kctl;
2624 if (info_ret)
2625 *info_ret = info;
2626 return 0;
2627}
2628EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);