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Merge remote-tracking branch 'regulator/fix/max77802' into regulator-linus
[mirror_ubuntu-artful-kernel.git] / sound / core / pcm_lib.c
CommitLineData
1da177e4
LT		 1/*
2 * Digital Audio (PCM) abstract layer
c1017a4c 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4
LT		 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
1da177e4 23#include <linux/slab.h>
174cd4b1 24#include <linux/sched/signal.h>
1da177e4 25#include <linux/time.h>
3f7440a6 26#include <linux/math64.h>
d81a6d71 27#include <linux/export.h>
1da177e4
LT		 28#include <sound/core.h>
29#include <sound/control.h>
2d3391ec 30#include <sound/tlv.h>
1da177e4
LT		 31#include <sound/info.h>
32#include <sound/pcm.h>
33#include <sound/pcm_params.h>
34#include <sound/timer.h>
35
f5914908
TI		 36#ifdef CONFIG_SND_PCM_XRUN_DEBUG
37#define CREATE_TRACE_POINTS
38#include "pcm_trace.h"
39#else
40#define trace_hwptr(substream, pos, in_interrupt)
41#define trace_xrun(substream)
42#define trace_hw_ptr_error(substream, reason)
43#endif
44
1da177e4
LT		 45/*
46 * fill ring buffer with silence
47 * runtime->silence_start: starting pointer to silence area
48 * runtime->silence_filled: size filled with silence
49 * runtime->silence_threshold: threshold from application
50 * runtime->silence_size: maximal size from application
51 *
52 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
53 */
877211f5 54void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
1da177e4 55{
877211f5 56 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 57 snd_pcm_uframes_t frames, ofs, transfer;
58
59 if (runtime->silence_size < runtime->boundary) {
60 snd_pcm_sframes_t noise_dist, n;
61 if (runtime->silence_start != runtime->control->appl_ptr) {
62 n = runtime->control->appl_ptr - runtime->silence_start;
63 if (n < 0)
64 n += runtime->boundary;
65 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
66 runtime->silence_filled -= n;
67 else
68 runtime->silence_filled = 0;
69 runtime->silence_start = runtime->control->appl_ptr;
70 }
235475cb 71 if (runtime->silence_filled >= runtime->buffer_size)
1da177e4 72 return;
1da177e4
LT		 73 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
74 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
75 return;
76 frames = runtime->silence_threshold - noise_dist;
77 if (frames > runtime->silence_size)
78 frames = runtime->silence_size;
79 } else {
80 if (new_hw_ptr == ULONG_MAX) { /* initialization */
81 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
9e216e8a
JK		 82 if (avail > runtime->buffer_size)
83 avail = runtime->buffer_size;
1da177e4
LT		 84 runtime->silence_filled = avail > 0 ? avail : 0;
85 runtime->silence_start = (runtime->status->hw_ptr +
86 runtime->silence_filled) %
87 runtime->boundary;
88 } else {
89 ofs = runtime->status->hw_ptr;
90 frames = new_hw_ptr - ofs;
91 if ((snd_pcm_sframes_t)frames < 0)
92 frames += runtime->boundary;
93 runtime->silence_filled -= frames;
94 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
95 runtime->silence_filled = 0;
9a826ddb 96 runtime->silence_start = new_hw_ptr;
1da177e4 97 } else {
9a826ddb 98 runtime->silence_start = ofs;
1da177e4 99 }
1da177e4
LT		 100 }
101 frames = runtime->buffer_size - runtime->silence_filled;
102 }
7eaa943c
TI		 103 if (snd_BUG_ON(frames > runtime->buffer_size))
104 return;
1da177e4
LT		 105 if (frames == 0)
106 return;
9a826ddb 107 ofs = runtime->silence_start % runtime->buffer_size;
1da177e4
LT		 108 while (frames > 0) {
109 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
110 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
111 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
112 if (substream->ops->silence) {
113 int err;
114 err = substream->ops->silence(substream, -1, ofs, transfer);
7eaa943c 115 snd_BUG_ON(err < 0);
1da177e4
LT		 116 } else {
117 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
118 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
119 }
120 } else {
121 unsigned int c;
122 unsigned int channels = runtime->channels;
123 if (substream->ops->silence) {
124 for (c = 0; c < channels; ++c) {
125 int err;
126 err = substream->ops->silence(substream, c, ofs, transfer);
7eaa943c 127 snd_BUG_ON(err < 0);
1da177e4
LT		 128 }
129 } else {
130 size_t dma_csize = runtime->dma_bytes / channels;
131 for (c = 0; c < channels; ++c) {
132 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
133 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
134 }
135 }
136 }
137 runtime->silence_filled += transfer;
138 frames -= transfer;
139 ofs = 0;
140 }
141}
142
acb03d44
EB		 143#ifdef CONFIG_SND_DEBUG
144void snd_pcm_debug_name(struct snd_pcm_substream *substream,
c0070110
TI		 145 char *name, size_t len)
146{
147 snprintf(name, len, "pcmC%dD%d%c:%d",
148 substream->pcm->card->number,
149 substream->pcm->device,
150 substream->stream ? 'c' : 'p',
151 substream->number);
152}
acb03d44
EB		 153EXPORT_SYMBOL(snd_pcm_debug_name);
154#endif
c0070110 155
741b20cf
JK		 156#define XRUN_DEBUG_BASIC (1<<0)
157#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
158#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
741b20cf 159
ed3da3d9 160#ifdef CONFIG_SND_PCM_XRUN_DEBUG
4d96eb25 161
741b20cf
JK		 162#define xrun_debug(substream, mask) \
163 ((substream)->pstr->xrun_debug & (mask))
0f17014b
JN		 164#else
165#define xrun_debug(substream, mask) 0
166#endif
ed3da3d9 167
741b20cf
JK		 168#define dump_stack_on_xrun(substream) do { \
169 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
170 dump_stack(); \
ed3da3d9
TI		 171 } while (0)
172
877211f5 173static void xrun(struct snd_pcm_substream *substream)
1da177e4 174{
13f040f9
JK		 175 struct snd_pcm_runtime *runtime = substream->runtime;
176
f5914908 177 trace_xrun(substream);
13f040f9
JK		 178 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
179 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
1da177e4 180 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
741b20cf 181 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
c0070110 182 char name[16];
acb03d44 183 snd_pcm_debug_name(substream, name, sizeof(name));
09e56df8 184 pcm_warn(substream->pcm, "XRUN: %s\n", name);
ed3da3d9 185 dump_stack_on_xrun(substream);
1da177e4 186 }
1da177e4
LT		 187}
188
0f17014b 189#ifdef CONFIG_SND_PCM_XRUN_DEBUG
f5914908 190#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
4d96eb25 191 do { \
f5914908 192 trace_hw_ptr_error(substream, reason); \
4d96eb25 193 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
f5914908
TI		 194 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
195 (in_interrupt) ? 'Q' : 'P', ##args); \
4d96eb25
JK		 196 dump_stack_on_xrun(substream); \
197 } \
198 } while (0)
199
4d96eb25
JK		 200#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
201
4d96eb25 202#define hw_ptr_error(substream, fmt, args...) do { } while (0)
4d96eb25
JK		 203
204#endif
205
1250932e
JK		 206int snd_pcm_update_state(struct snd_pcm_substream *substream,
207 struct snd_pcm_runtime *runtime)
1da177e4
LT		 208{
209 snd_pcm_uframes_t avail;
210
211 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
212 avail = snd_pcm_playback_avail(runtime);
213 else
214 avail = snd_pcm_capture_avail(runtime);
215 if (avail > runtime->avail_max)
216 runtime->avail_max = avail;
4cdc115f
TI		 217 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
218 if (avail >= runtime->buffer_size) {
1da177e4 219 snd_pcm_drain_done(substream);
4cdc115f
TI		 220 return -EPIPE;
221 }
222 } else {
223 if (avail >= runtime->stop_threshold) {
1da177e4 224 xrun(substream);
4cdc115f
TI		 225 return -EPIPE;
226 }
1da177e4 227 }
5daeba34
DD		 228 if (runtime->twake) {
229 if (avail >= runtime->twake)
230 wake_up(&runtime->tsleep);
231 } else if (avail >= runtime->control->avail_min)
232 wake_up(&runtime->sleep);
1da177e4
LT		 233 return 0;
234}
235
3179f620
PLB		 236static void update_audio_tstamp(struct snd_pcm_substream *substream,
237 struct timespec *curr_tstamp,
238 struct timespec *audio_tstamp)
239{
240 struct snd_pcm_runtime *runtime = substream->runtime;
241 u64 audio_frames, audio_nsecs;
242 struct timespec driver_tstamp;
243
244 if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
245 return;
246
247 if (!(substream->ops->get_time_info) ||
248 (runtime->audio_tstamp_report.actual_type ==
249 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
250
251 /*
252 * provide audio timestamp derived from pointer position
253 * add delay only if requested
254 */
255
256 audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
257
258 if (runtime->audio_tstamp_config.report_delay) {
259 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
260 audio_frames -= runtime->delay;
261 else
262 audio_frames += runtime->delay;
263 }
264 audio_nsecs = div_u64(audio_frames * 1000000000LL,
265 runtime->rate);
266 *audio_tstamp = ns_to_timespec(audio_nsecs);
267 }
268 runtime->status->audio_tstamp = *audio_tstamp;
269 runtime->status->tstamp = *curr_tstamp;
270
271 /*
272 * re-take a driver timestamp to let apps detect if the reference tstamp
273 * read by low-level hardware was provided with a delay
274 */
275 snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);
276 runtime->driver_tstamp = driver_tstamp;
277}
278
f240406b
JK		 279static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
280 unsigned int in_interrupt)
1da177e4 281{
877211f5 282 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4 283 snd_pcm_uframes_t pos;
f240406b 284 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
bbf6ad13
JK		 285 snd_pcm_sframes_t hdelta, delta;
286 unsigned long jdelta;
3509a03f
PLB		 287 unsigned long curr_jiffies;
288 struct timespec curr_tstamp;
4eeaaeae 289 struct timespec audio_tstamp;
0e8014d7 290 int crossed_boundary = 0;
1da177e4 291
bbf6ad13 292 old_hw_ptr = runtime->status->hw_ptr;
3509a03f
PLB		 293
294 /*
295 * group pointer, time and jiffies reads to allow for more
296 * accurate correlations/corrections.
297 * The values are stored at the end of this routine after
298 * corrections for hw_ptr position
299 */
f240406b 300 pos = substream->ops->pointer(substream);
3509a03f 301 curr_jiffies = jiffies;
4eeaaeae 302 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
3179f620
PLB		 303 if ((substream->ops->get_time_info) &&
304 (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
305 substream->ops->get_time_info(substream, &curr_tstamp,
306 &audio_tstamp,
307 &runtime->audio_tstamp_config,
308 &runtime->audio_tstamp_report);
309
310 /* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */
311 if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
312 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
313 } else
314 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
4eeaaeae
PLB		 315 }
316
1da177e4
LT		 317 if (pos == SNDRV_PCM_POS_XRUN) {
318 xrun(substream);
319 return -EPIPE;
320 }
f240406b 321 if (pos >= runtime->buffer_size) {
09e56df8 322 if (printk_ratelimit()) {
f240406b 323 char name[16];
acb03d44 324 snd_pcm_debug_name(substream, name, sizeof(name));
09e56df8 325 pcm_err(substream->pcm,
0ab1ace8 326 "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
09e56df8
TI		 327 name, pos, runtime->buffer_size,
328 runtime->period_size);
f240406b
JK		 329 }
330 pos = 0;
cedb8118 331 }
f240406b 332 pos -= pos % runtime->min_align;
f5914908 333 trace_hwptr(substream, pos, in_interrupt);
ed3da3d9
TI		 334 hw_base = runtime->hw_ptr_base;
335 new_hw_ptr = hw_base + pos;
f240406b
JK		 336 if (in_interrupt) {
337 /* we know that one period was processed */
338 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
e7636925 339 delta = runtime->hw_ptr_interrupt + runtime->period_size;
f240406b 340 if (delta > new_hw_ptr) {
bd76af0f 341 /* check for double acknowledged interrupts */
3509a03f 342 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
13a98839 343 if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
bd76af0f 344 hw_base += runtime->buffer_size;
0e8014d7 345 if (hw_base >= runtime->boundary) {
bd76af0f 346 hw_base = 0;
0e8014d7
PLB		 347 crossed_boundary++;
348 }
bd76af0f
JK		 349 new_hw_ptr = hw_base + pos;
350 goto __delta;
351 }
1da177e4 352 }
1da177e4 353 }
f240406b
JK		 354 /* new_hw_ptr might be lower than old_hw_ptr in case when */
355 /* pointer crosses the end of the ring buffer */
356 if (new_hw_ptr < old_hw_ptr) {
357 hw_base += runtime->buffer_size;
0e8014d7 358 if (hw_base >= runtime->boundary) {
f240406b 359 hw_base = 0;
0e8014d7
PLB		 360 crossed_boundary++;
361 }
f240406b
JK		 362 new_hw_ptr = hw_base + pos;
363 }
364 __delta:
b406e610
CL		 365 delta = new_hw_ptr - old_hw_ptr;
366 if (delta < 0)
367 delta += runtime->boundary;
ab69a490 368
59ff878f 369 if (runtime->no_period_wakeup) {
12ff414e 370 snd_pcm_sframes_t xrun_threshold;
59ff878f
CL		 371 /*
372 * Without regular period interrupts, we have to check
373 * the elapsed time to detect xruns.
374 */
3509a03f 375 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
47228e48
CL		 376 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
377 goto no_delta_check;
59ff878f 378 hdelta = jdelta - delta * HZ / runtime->rate;
12ff414e
KA		 379 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
380 while (hdelta > xrun_threshold) {
59ff878f
CL		 381 delta += runtime->buffer_size;
382 hw_base += runtime->buffer_size;
0e8014d7 383 if (hw_base >= runtime->boundary) {
59ff878f 384 hw_base = 0;
0e8014d7
PLB		 385 crossed_boundary++;
386 }
59ff878f
CL		 387 new_hw_ptr = hw_base + pos;
388 hdelta -= runtime->hw_ptr_buffer_jiffies;
389 }
ab69a490 390 goto no_delta_check;
59ff878f 391 }
ab69a490 392
f240406b 393 /* something must be really wrong */
7b3a177b 394 if (delta >= runtime->buffer_size + runtime->period_size) {
f5914908
TI		 395 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
396 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
397 substream->stream, (long)pos,
398 (long)new_hw_ptr, (long)old_hw_ptr);
f240406b
JK		 399 return 0;
400 }
c87d9732
TI		 401
402 /* Do jiffies check only in xrun_debug mode */
741b20cf 403 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
c87d9732
TI		 404 goto no_jiffies_check;
405
3e5b5016
TI		 406 /* Skip the jiffies check for hardwares with BATCH flag.
407 * Such hardware usually just increases the position at each IRQ,
408 * thus it can't give any strange position.
409 */
410 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
411 goto no_jiffies_check;
f240406b 412 hdelta = delta;
a4444da3
JK		 413 if (hdelta < runtime->delay)
414 goto no_jiffies_check;
415 hdelta -= runtime->delay;
3509a03f 416 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
bbf6ad13
JK		 417 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
418 delta = jdelta /
419 (((runtime->period_size * HZ) / runtime->rate)
420 + HZ/100);
f240406b
JK		 421 /* move new_hw_ptr according jiffies not pos variable */
422 new_hw_ptr = old_hw_ptr;
ed69c6a8 423 hw_base = delta;
f240406b
JK		 424 /* use loop to avoid checks for delta overflows */
425 /* the delta value is small or zero in most cases */
426 while (delta > 0) {
427 new_hw_ptr += runtime->period_size;
0e8014d7 428 if (new_hw_ptr >= runtime->boundary) {
f240406b 429 new_hw_ptr -= runtime->boundary;
0e8014d7
PLB		 430 crossed_boundary--;
431 }
f240406b
JK		 432 delta--;
433 }
434 /* align hw_base to buffer_size */
f5914908
TI		 435 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
436 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
bbf6ad13
JK		 437 (long)pos, (long)hdelta,
438 (long)runtime->period_size, jdelta,
ed69c6a8 439 ((hdelta * HZ) / runtime->rate), hw_base,
f240406b
JK		 440 (unsigned long)old_hw_ptr,
441 (unsigned long)new_hw_ptr);
ed69c6a8
JK		 442 /* reset values to proper state */
443 delta = 0;
444 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
bbf6ad13 445 }
3e5b5016 446 no_jiffies_check:
bbf6ad13 447 if (delta > runtime->period_size + runtime->period_size / 2) {
f5914908
TI		 448 hw_ptr_error(substream, in_interrupt,
449 "Lost interrupts?",
450 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
ed3da3d9 451 substream->stream, (long)delta,
f240406b
JK		 452 (long)new_hw_ptr,
453 (long)old_hw_ptr);
ed3da3d9 454 }
f240406b 455
ab69a490 456 no_delta_check:
3179f620
PLB		 457 if (runtime->status->hw_ptr == new_hw_ptr) {
458 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
f240406b 459 return 0;
3179f620 460 }
ab1863fc 461
1da177e4
LT		 462 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
463 runtime->silence_size > 0)
464 snd_pcm_playback_silence(substream, new_hw_ptr);
465
e7636925 466 if (in_interrupt) {
ead4046b
CL		 467 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
468 if (delta < 0)
469 delta += runtime->boundary;
470 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
471 runtime->hw_ptr_interrupt += delta;
472 if (runtime->hw_ptr_interrupt >= runtime->boundary)
473 runtime->hw_ptr_interrupt -= runtime->boundary;
e7636925 474 }
ed3da3d9 475 runtime->hw_ptr_base = hw_base;
1da177e4 476 runtime->status->hw_ptr = new_hw_ptr;
3509a03f 477 runtime->hw_ptr_jiffies = curr_jiffies;
0e8014d7
PLB		 478 if (crossed_boundary) {
479 snd_BUG_ON(crossed_boundary != 1);
480 runtime->hw_ptr_wrap += runtime->boundary;
481 }
4eeaaeae 482
3179f620 483 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
4eeaaeae 484
1250932e 485 return snd_pcm_update_state(substream, runtime);
1da177e4
LT		 486}
487
488/* CAUTION: call it with irq disabled */
877211f5 489int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
1da177e4 490{
f240406b 491 return snd_pcm_update_hw_ptr0(substream, 0);
1da177e4
LT		 492}
493
494/**
495 * snd_pcm_set_ops - set the PCM operators
496 * @pcm: the pcm instance
497 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
498 * @ops: the operator table
499 *
500 * Sets the given PCM operators to the pcm instance.
501 */
e6c2e7eb
LPC		 502void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
503 const struct snd_pcm_ops *ops)
1da177e4 504{
877211f5
TI		 505 struct snd_pcm_str *stream = &pcm->streams[direction];
506 struct snd_pcm_substream *substream;
1da177e4
LT		 507
508 for (substream = stream->substream; substream != NULL; substream = substream->next)
509 substream->ops = ops;
510}
511
e88e8ae6 512EXPORT_SYMBOL(snd_pcm_set_ops);
1da177e4
LT		 513
514/**
515 * snd_pcm_sync - set the PCM sync id
516 * @substream: the pcm substream
517 *
518 * Sets the PCM sync identifier for the card.
519 */
877211f5 520void snd_pcm_set_sync(struct snd_pcm_substream *substream)
1da177e4 521{
877211f5 522 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 523
524 runtime->sync.id32[0] = substream->pcm->card->number;
525 runtime->sync.id32[1] = -1;
526 runtime->sync.id32[2] = -1;
527 runtime->sync.id32[3] = -1;
528}
529
e88e8ae6
TI		 530EXPORT_SYMBOL(snd_pcm_set_sync);
531
1da177e4
LT		 532/*
533 * Standard ioctl routine
534 */
535
1da177e4
LT		 536static inline unsigned int div32(unsigned int a, unsigned int b,
537 unsigned int *r)
538{
539 if (b == 0) {
540 *r = 0;
541 return UINT_MAX;
542 }
543 *r = a % b;
544 return a / b;
545}
546
547static inline unsigned int div_down(unsigned int a, unsigned int b)
548{
549 if (b == 0)
550 return UINT_MAX;
551 return a / b;
552}
553
554static inline unsigned int div_up(unsigned int a, unsigned int b)
555{
556 unsigned int r;
557 unsigned int q;
558 if (b == 0)
559 return UINT_MAX;
560 q = div32(a, b, &r);
561 if (r)
562 ++q;
563 return q;
564}
565
566static inline unsigned int mul(unsigned int a, unsigned int b)
567{
568 if (a == 0)
569 return 0;
570 if (div_down(UINT_MAX, a) < b)
571 return UINT_MAX;
572 return a * b;
573}
574
575static inline unsigned int muldiv32(unsigned int a, unsigned int b,
576 unsigned int c, unsigned int *r)
577{
578 u_int64_t n = (u_int64_t) a * b;
579 if (c == 0) {
7eaa943c 580 snd_BUG_ON(!n);
1da177e4
LT		 581 *r = 0;
582 return UINT_MAX;
583 }
3f7440a6 584 n = div_u64_rem(n, c, r);
1da177e4
LT		 585 if (n >= UINT_MAX) {
586 *r = 0;
587 return UINT_MAX;
588 }
589 return n;
590}
591
1da177e4
LT		 592/**
593 * snd_interval_refine - refine the interval value of configurator
594 * @i: the interval value to refine
595 * @v: the interval value to refer to
596 *
597 * Refines the interval value with the reference value.
598 * The interval is changed to the range satisfying both intervals.
599 * The interval status (min, max, integer, etc.) are evaluated.
600 *
eb7c06e8
YB		 601 * Return: Positive if the value is changed, zero if it's not changed, or a
602 * negative error code.
1da177e4 603 */
877211f5 604int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
1da177e4
LT		 605{
606 int changed = 0;
7eaa943c
TI		 607 if (snd_BUG_ON(snd_interval_empty(i)))
608 return -EINVAL;
1da177e4
LT		 609 if (i->min < v->min) {
610 i->min = v->min;
611 i->openmin = v->openmin;
612 changed = 1;
613 } else if (i->min == v->min && !i->openmin && v->openmin) {
614 i->openmin = 1;
615 changed = 1;
616 }
617 if (i->max > v->max) {
618 i->max = v->max;
619 i->openmax = v->openmax;
620 changed = 1;
621 } else if (i->max == v->max && !i->openmax && v->openmax) {
622 i->openmax = 1;
623 changed = 1;
624 }
625 if (!i->integer && v->integer) {
626 i->integer = 1;
627 changed = 1;
628 }
629 if (i->integer) {
630 if (i->openmin) {
631 i->min++;
632 i->openmin = 0;
633 }
634 if (i->openmax) {
635 i->max--;
636 i->openmax = 0;
637 }
638 } else if (!i->openmin && !i->openmax && i->min == i->max)
639 i->integer = 1;
640 if (snd_interval_checkempty(i)) {
641 snd_interval_none(i);
642 return -EINVAL;
643 }
644 return changed;
645}
646
e88e8ae6
TI		 647EXPORT_SYMBOL(snd_interval_refine);
648
877211f5 649static int snd_interval_refine_first(struct snd_interval *i)
1da177e4 650{
7eaa943c
TI		 651 if (snd_BUG_ON(snd_interval_empty(i)))
652 return -EINVAL;
1da177e4
LT		 653 if (snd_interval_single(i))
654 return 0;
655 i->max = i->min;
656 i->openmax = i->openmin;
657 if (i->openmax)
658 i->max++;
659 return 1;
660}
661
877211f5 662static int snd_interval_refine_last(struct snd_interval *i)
1da177e4 663{
7eaa943c
TI		 664 if (snd_BUG_ON(snd_interval_empty(i)))
665 return -EINVAL;
1da177e4
LT		 666 if (snd_interval_single(i))
667 return 0;
668 i->min = i->max;
669 i->openmin = i->openmax;
670 if (i->openmin)
671 i->min--;
672 return 1;
673}
674
877211f5 675void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
1da177e4
LT		 676{
677 if (a->empty || b->empty) {
678 snd_interval_none(c);
679 return;
680 }
681 c->empty = 0;
682 c->min = mul(a->min, b->min);
683 c->openmin = (a->openmin || b->openmin);
684 c->max = mul(a->max, b->max);
685 c->openmax = (a->openmax || b->openmax);
686 c->integer = (a->integer && b->integer);
687}
688
689/**
690 * snd_interval_div - refine the interval value with division
df8db936
TI		 691 * @a: dividend
692 * @b: divisor
693 * @c: quotient
1da177e4
LT		 694 *
695 * c = a / b
696 *
697 * Returns non-zero if the value is changed, zero if not changed.
698 */
877211f5 699void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
1da177e4
LT		 700{
701 unsigned int r;
702 if (a->empty || b->empty) {
703 snd_interval_none(c);
704 return;
705 }
706 c->empty = 0;
707 c->min = div32(a->min, b->max, &r);
708 c->openmin = (r || a->openmin || b->openmax);
709 if (b->min > 0) {
710 c->max = div32(a->max, b->min, &r);
711 if (r) {
712 c->max++;
713 c->openmax = 1;
714 } else
715 c->openmax = (a->openmax || b->openmin);
716 } else {
717 c->max = UINT_MAX;
718 c->openmax = 0;
719 }
720 c->integer = 0;
721}
722
723/**
724 * snd_interval_muldivk - refine the interval value
df8db936
TI		 725 * @a: dividend 1
726 * @b: dividend 2
727 * @k: divisor (as integer)
728 * @c: result
729 *
1da177e4
LT		 730 * c = a * b / k
731 *
732 * Returns non-zero if the value is changed, zero if not changed.
733 */
877211f5
TI		 734void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
735 unsigned int k, struct snd_interval *c)
1da177e4
LT		 736{
737 unsigned int r;
738 if (a->empty || b->empty) {
739 snd_interval_none(c);
740 return;
741 }
742 c->empty = 0;
743 c->min = muldiv32(a->min, b->min, k, &r);
744 c->openmin = (r || a->openmin || b->openmin);
745 c->max = muldiv32(a->max, b->max, k, &r);
746 if (r) {
747 c->max++;
748 c->openmax = 1;
749 } else
750 c->openmax = (a->openmax || b->openmax);
751 c->integer = 0;
752}
753
754/**
755 * snd_interval_mulkdiv - refine the interval value
df8db936
TI		 756 * @a: dividend 1
757 * @k: dividend 2 (as integer)
758 * @b: divisor
759 * @c: result
1da177e4
LT		 760 *
761 * c = a * k / b
762 *
763 * Returns non-zero if the value is changed, zero if not changed.
764 */
877211f5
TI		 765void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
766 const struct snd_interval *b, struct snd_interval *c)
1da177e4
LT		 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 = muldiv32(a->min, k, b->max, &r);
775 c->openmin = (r || a->openmin || b->openmax);
776 if (b->min > 0) {
777 c->max = muldiv32(a->max, k, 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
1da177e4
LT		 790/* ---- */
791
792
793/**
794 * snd_interval_ratnum - refine the interval value
df8db936
TI		 795 * @i: interval to refine
796 * @rats_count: number of ratnum_t
797 * @rats: ratnum_t array
798 * @nump: pointer to store the resultant numerator
799 * @denp: pointer to store the resultant denominator
1da177e4 800 *
eb7c06e8
YB		 801 * Return: Positive if the value is changed, zero if it's not changed, or a
802 * negative error code.
1da177e4 803 */
877211f5 804int snd_interval_ratnum(struct snd_interval *i,
e5e113cf 805 unsigned int rats_count, const struct snd_ratnum *rats,
877211f5 806 unsigned int *nump, unsigned int *denp)
1da177e4 807{
8374e24c
KH		 808 unsigned int best_num, best_den;
809 int best_diff;
1da177e4 810 unsigned int k;
877211f5 811 struct snd_interval t;
1da177e4 812 int err;
8374e24c
KH		 813 unsigned int result_num, result_den;
814 int result_diff;
1da177e4
LT		 815
816 best_num = best_den = best_diff = 0;
817 for (k = 0; k < rats_count; ++k) {
818 unsigned int num = rats[k].num;
819 unsigned int den;
820 unsigned int q = i->min;
821 int diff;
822 if (q == 0)
823 q = 1;
40962d7c 824 den = div_up(num, q);
1da177e4
LT		 825 if (den < rats[k].den_min)
826 continue;
827 if (den > rats[k].den_max)
828 den = rats[k].den_max;
829 else {
830 unsigned int r;
831 r = (den - rats[k].den_min) % rats[k].den_step;
832 if (r != 0)
833 den -= r;
834 }
835 diff = num - q * den;
8374e24c
KH		 836 if (diff < 0)
837 diff = -diff;
1da177e4
LT		 838 if (best_num == 0 ||
839 diff * best_den < best_diff * den) {
840 best_diff = diff;
841 best_den = den;
842 best_num = num;
843 }
844 }
845 if (best_den == 0) {
846 i->empty = 1;
847 return -EINVAL;
848 }
849 t.min = div_down(best_num, best_den);
850 t.openmin = !!(best_num % best_den);
851
8374e24c
KH		 852 result_num = best_num;
853 result_diff = best_diff;
854 result_den = best_den;
1da177e4
LT		 855 best_num = best_den = best_diff = 0;
856 for (k = 0; k < rats_count; ++k) {
857 unsigned int num = rats[k].num;
858 unsigned int den;
859 unsigned int q = i->max;
860 int diff;
861 if (q == 0) {
862 i->empty = 1;
863 return -EINVAL;
864 }
40962d7c 865 den = div_down(num, q);
1da177e4
LT		 866 if (den > rats[k].den_max)
867 continue;
868 if (den < rats[k].den_min)
869 den = rats[k].den_min;
870 else {
871 unsigned int r;
872 r = (den - rats[k].den_min) % rats[k].den_step;
873 if (r != 0)
874 den += rats[k].den_step - r;
875 }
876 diff = q * den - num;
8374e24c
KH		 877 if (diff < 0)
878 diff = -diff;
1da177e4
LT		 879 if (best_num == 0 ||
880 diff * best_den < best_diff * den) {
881 best_diff = diff;
882 best_den = den;
883 best_num = num;
884 }
885 }
886 if (best_den == 0) {
887 i->empty = 1;
888 return -EINVAL;
889 }
890 t.max = div_up(best_num, best_den);
891 t.openmax = !!(best_num % best_den);
892 t.integer = 0;
893 err = snd_interval_refine(i, &t);
894 if (err < 0)
895 return err;
896
897 if (snd_interval_single(i)) {
8374e24c
KH		 898 if (best_diff * result_den < result_diff * best_den) {
899 result_num = best_num;
900 result_den = best_den;
901 }
1da177e4 902 if (nump)
8374e24c 903 *nump = result_num;
1da177e4 904 if (denp)
8374e24c 905 *denp = result_den;
1da177e4
LT		 906 }
907 return err;
908}
909
e88e8ae6
TI		 910EXPORT_SYMBOL(snd_interval_ratnum);
911
1da177e4
LT		 912/**
913 * snd_interval_ratden - refine the interval value
df8db936 914 * @i: interval to refine
877211f5
TI		 915 * @rats_count: number of struct ratden
916 * @rats: struct ratden array
df8db936
TI		 917 * @nump: pointer to store the resultant numerator
918 * @denp: pointer to store the resultant denominator
1da177e4 919 *
eb7c06e8
YB		 920 * Return: Positive if the value is changed, zero if it's not changed, or a
921 * negative error code.
1da177e4 922 */
877211f5 923static int snd_interval_ratden(struct snd_interval *i,
e5e113cf
LPC		 924 unsigned int rats_count,
925 const struct snd_ratden *rats,
1da177e4
LT		 926 unsigned int *nump, unsigned int *denp)
927{
928 unsigned int best_num, best_diff, best_den;
929 unsigned int k;
877211f5 930 struct snd_interval t;
1da177e4
LT		 931 int err;
932
933 best_num = best_den = best_diff = 0;
934 for (k = 0; k < rats_count; ++k) {
935 unsigned int num;
936 unsigned int den = rats[k].den;
937 unsigned int q = i->min;
938 int diff;
939 num = mul(q, den);
940 if (num > rats[k].num_max)
941 continue;
942 if (num < rats[k].num_min)
943 num = rats[k].num_max;
944 else {
945 unsigned int r;
946 r = (num - rats[k].num_min) % rats[k].num_step;
947 if (r != 0)
948 num += rats[k].num_step - r;
949 }
950 diff = num - q * den;
951 if (best_num == 0 ||
952 diff * best_den < best_diff * den) {
953 best_diff = diff;
954 best_den = den;
955 best_num = num;
956 }
957 }
958 if (best_den == 0) {
959 i->empty = 1;
960 return -EINVAL;
961 }
962 t.min = div_down(best_num, best_den);
963 t.openmin = !!(best_num % best_den);
964
965 best_num = best_den = best_diff = 0;
966 for (k = 0; k < rats_count; ++k) {
967 unsigned int num;
968 unsigned int den = rats[k].den;
969 unsigned int q = i->max;
970 int diff;
971 num = mul(q, den);
972 if (num < rats[k].num_min)
973 continue;
974 if (num > rats[k].num_max)
975 num = rats[k].num_max;
976 else {
977 unsigned int r;
978 r = (num - rats[k].num_min) % rats[k].num_step;
979 if (r != 0)
980 num -= r;
981 }
982 diff = q * den - num;
983 if (best_num == 0 ||
984 diff * best_den < best_diff * den) {
985 best_diff = diff;
986 best_den = den;
987 best_num = num;
988 }
989 }
990 if (best_den == 0) {
991 i->empty = 1;
992 return -EINVAL;
993 }
994 t.max = div_up(best_num, best_den);
995 t.openmax = !!(best_num % best_den);
996 t.integer = 0;
997 err = snd_interval_refine(i, &t);
998 if (err < 0)
999 return err;
1000
1001 if (snd_interval_single(i)) {
1002 if (nump)
1003 *nump = best_num;
1004 if (denp)
1005 *denp = best_den;
1006 }
1007 return err;
1008}
1009
1010/**
1011 * snd_interval_list - refine the interval value from the list
1012 * @i: the interval value to refine
1013 * @count: the number of elements in the list
1014 * @list: the value list
1015 * @mask: the bit-mask to evaluate
1016 *
1017 * Refines the interval value from the list.
1018 * When mask is non-zero, only the elements corresponding to bit 1 are
1019 * evaluated.
1020 *
eb7c06e8
YB		 1021 * Return: Positive if the value is changed, zero if it's not changed, or a
1022 * negative error code.
1da177e4 1023 */
4af87a93
MB		 1024int snd_interval_list(struct snd_interval *i, unsigned int count,
1025 const unsigned int *list, unsigned int mask)
1da177e4
LT		 1026{
1027 unsigned int k;
b1ddaf68 1028 struct snd_interval list_range;
0981a260
TI		 1029
1030 if (!count) {
1031 i->empty = 1;
1032 return -EINVAL;
1033 }
b1ddaf68
CL		 1034 snd_interval_any(&list_range);
1035 list_range.min = UINT_MAX;
1036 list_range.max = 0;
1da177e4
LT		 1037 for (k = 0; k < count; k++) {
1038 if (mask && !(mask & (1 << k)))
1039 continue;
b1ddaf68 1040 if (!snd_interval_test(i, list[k]))
1da177e4 1041 continue;
b1ddaf68
CL		 1042 list_range.min = min(list_range.min, list[k]);
1043 list_range.max = max(list_range.max, list[k]);
1da177e4 1044 }
b1ddaf68 1045 return snd_interval_refine(i, &list_range);
1da177e4
LT		 1046}
1047
e88e8ae6
TI		 1048EXPORT_SYMBOL(snd_interval_list);
1049
f66f898e
PR		 1050/**
1051 * snd_interval_ranges - refine the interval value from the list of ranges
1052 * @i: the interval value to refine
1053 * @count: the number of elements in the list of ranges
1054 * @ranges: the ranges list
1055 * @mask: the bit-mask to evaluate
1056 *
1057 * Refines the interval value from the list of ranges.
1058 * When mask is non-zero, only the elements corresponding to bit 1 are
1059 * evaluated.
1060 *
1061 * Return: Positive if the value is changed, zero if it's not changed, or a
1062 * negative error code.
1063 */
1064int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1065 const struct snd_interval *ranges, unsigned int mask)
1066{
1067 unsigned int k;
1068 struct snd_interval range_union;
1069 struct snd_interval range;
1070
1071 if (!count) {
1072 snd_interval_none(i);
1073 return -EINVAL;
1074 }
1075 snd_interval_any(&range_union);
1076 range_union.min = UINT_MAX;
1077 range_union.max = 0;
1078 for (k = 0; k < count; k++) {
1079 if (mask && !(mask & (1 << k)))
1080 continue;
1081 snd_interval_copy(&range, &ranges[k]);
1082 if (snd_interval_refine(&range, i) < 0)
1083 continue;
1084 if (snd_interval_empty(&range))
1085 continue;
1086
1087 if (range.min < range_union.min) {
1088 range_union.min = range.min;
1089 range_union.openmin = 1;
1090 }
1091 if (range.min == range_union.min && !range.openmin)
1092 range_union.openmin = 0;
1093 if (range.max > range_union.max) {
1094 range_union.max = range.max;
1095 range_union.openmax = 1;
1096 }
1097 if (range.max == range_union.max && !range.openmax)
1098 range_union.openmax = 0;
1099 }
1100 return snd_interval_refine(i, &range_union);
1101}
1102EXPORT_SYMBOL(snd_interval_ranges);
1103
0f519b62 1104static int snd_interval_step(struct snd_interval *i, unsigned int step)
1da177e4
LT		 1105{
1106 unsigned int n;
1107 int changed = 0;
0f519b62 1108 n = i->min % step;
1da177e4
LT		 1109 if (n != 0 || i->openmin) {
1110 i->min += step - n;
df1e4719 1111 i->openmin = 0;
1da177e4
LT		 1112 changed = 1;
1113 }
0f519b62 1114 n = i->max % step;
1da177e4
LT		 1115 if (n != 0 || i->openmax) {
1116 i->max -= n;
df1e4719 1117 i->openmax = 0;
1da177e4
LT		 1118 changed = 1;
1119 }
1120 if (snd_interval_checkempty(i)) {
1121 i->empty = 1;
1122 return -EINVAL;
1123 }
1124 return changed;
1125}
1126
1127/* Info constraints helpers */
1128
1129/**
1130 * snd_pcm_hw_rule_add - add the hw-constraint rule
1131 * @runtime: the pcm runtime instance
1132 * @cond: condition bits
1133 * @var: the variable to evaluate
1134 * @func: the evaluation function
1135 * @private: the private data pointer passed to function
1136 * @dep: the dependent variables
1137 *
eb7c06e8 1138 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1139 */
877211f5 1140int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1da177e4
LT		 1141 int var,
1142 snd_pcm_hw_rule_func_t func, void *private,
1143 int dep, ...)
1144{
877211f5
TI		 1145 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1146 struct snd_pcm_hw_rule *c;
1da177e4
LT		 1147 unsigned int k;
1148 va_list args;
1149 va_start(args, dep);
1150 if (constrs->rules_num >= constrs->rules_all) {
877211f5 1151 struct snd_pcm_hw_rule *new;
1da177e4
LT		 1152 unsigned int new_rules = constrs->rules_all + 16;
1153 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
87a1c8aa
JJ		 1154 if (!new) {
1155 va_end(args);
1da177e4 1156 return -ENOMEM;
87a1c8aa 1157 }
1da177e4
LT		 1158 if (constrs->rules) {
1159 memcpy(new, constrs->rules,
1160 constrs->rules_num * sizeof(*c));
1161 kfree(constrs->rules);
1162 }
1163 constrs->rules = new;
1164 constrs->rules_all = new_rules;
1165 }
1166 c = &constrs->rules[constrs->rules_num];
1167 c->cond = cond;
1168 c->func = func;
1169 c->var = var;
1170 c->private = private;
1171 k = 0;
1172 while (1) {
87a1c8aa
JJ		 1173 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1174 va_end(args);
7eaa943c 1175 return -EINVAL;
87a1c8aa 1176 }
1da177e4
LT		 1177 c->deps[k++] = dep;
1178 if (dep < 0)
1179 break;
1180 dep = va_arg(args, int);
1181 }
1182 constrs->rules_num++;
1183 va_end(args);
1184 return 0;
87a1c8aa 1185}
1da177e4 1186
e88e8ae6
TI		 1187EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1188
1da177e4 1189/**
1c85cc64 1190 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
df8db936
TI		 1191 * @runtime: PCM runtime instance
1192 * @var: hw_params variable to apply the mask
1193 * @mask: the bitmap mask
1194 *
1c85cc64 1195 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
eb7c06e8
YB		 1196 *
1197 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1198 */
877211f5 1199int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1da177e4
LT		 1200 u_int32_t mask)
1201{
877211f5
TI		 1202 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1203 struct snd_mask *maskp = constrs_mask(constrs, var);
1da177e4
LT		 1204 *maskp->bits &= mask;
1205 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1206 if (*maskp->bits == 0)
1207 return -EINVAL;
1208 return 0;
1209}
1210
1211/**
1c85cc64 1212 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
df8db936
TI		 1213 * @runtime: PCM runtime instance
1214 * @var: hw_params variable to apply the mask
1215 * @mask: the 64bit bitmap mask
1216 *
1c85cc64 1217 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
eb7c06e8
YB		 1218 *
1219 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1220 */
877211f5 1221int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1da177e4
LT		 1222 u_int64_t mask)
1223{
877211f5
TI		 1224 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1225 struct snd_mask *maskp = constrs_mask(constrs, var);
1da177e4
LT		 1226 maskp->bits[0] &= (u_int32_t)mask;
1227 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1228 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1229 if (! maskp->bits[0] && ! maskp->bits[1])
1230 return -EINVAL;
1231 return 0;
1232}
63a5d4c6 1233EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1da177e4
LT		 1234
1235/**
1c85cc64 1236 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
df8db936
TI		 1237 * @runtime: PCM runtime instance
1238 * @var: hw_params variable to apply the integer constraint
1239 *
1240 * Apply the constraint of integer to an interval parameter.
eb7c06e8
YB		 1241 *
1242 * Return: Positive if the value is changed, zero if it's not changed, or a
1243 * negative error code.
1da177e4 1244 */
877211f5 1245int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1da177e4 1246{
877211f5 1247 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1da177e4
LT		 1248 return snd_interval_setinteger(constrs_interval(constrs, var));
1249}
1250
e88e8ae6
TI		 1251EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1252
1da177e4 1253/**
1c85cc64 1254 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
df8db936
TI		 1255 * @runtime: PCM runtime instance
1256 * @var: hw_params variable to apply the range
1257 * @min: the minimal value
1258 * @max: the maximal value
1259 *
1260 * Apply the min/max range constraint to an interval parameter.
eb7c06e8
YB		 1261 *
1262 * Return: Positive if the value is changed, zero if it's not changed, or a
1263 * negative error code.
1da177e4 1264 */
877211f5 1265int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1da177e4
LT		 1266 unsigned int min, unsigned int max)
1267{
877211f5
TI		 1268 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1269 struct snd_interval t;
1da177e4
LT		 1270 t.min = min;
1271 t.max = max;
1272 t.openmin = t.openmax = 0;
1273 t.integer = 0;
1274 return snd_interval_refine(constrs_interval(constrs, var), &t);
1275}
1276
e88e8ae6
TI		 1277EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1278
877211f5
TI		 1279static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1280 struct snd_pcm_hw_rule *rule)
1da177e4 1281{
877211f5 1282 struct snd_pcm_hw_constraint_list *list = rule->private;
1da177e4
LT		 1283 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1284}
1285
1286
1287/**
1c85cc64 1288 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
df8db936
TI		 1289 * @runtime: PCM runtime instance
1290 * @cond: condition bits
1291 * @var: hw_params variable to apply the list constraint
1292 * @l: list
1293 *
1294 * Apply the list of constraints to an interval parameter.
eb7c06e8
YB		 1295 *
1296 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1297 */
877211f5 1298int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1da177e4
LT		 1299 unsigned int cond,
1300 snd_pcm_hw_param_t var,
1464189f 1301 const struct snd_pcm_hw_constraint_list *l)
1da177e4
LT		 1302{
1303 return snd_pcm_hw_rule_add(runtime, cond, var,
1464189f 1304 snd_pcm_hw_rule_list, (void *)l,
1da177e4
LT		 1305 var, -1);
1306}
1307
e88e8ae6
TI		 1308EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1309
f66f898e
PR		 1310static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
1311 struct snd_pcm_hw_rule *rule)
1312{
1313 struct snd_pcm_hw_constraint_ranges *r = rule->private;
1314 return snd_interval_ranges(hw_param_interval(params, rule->var),
1315 r->count, r->ranges, r->mask);
1316}
1317
1318
1319/**
1320 * snd_pcm_hw_constraint_ranges - apply list of range constraints to a parameter
1321 * @runtime: PCM runtime instance
1322 * @cond: condition bits
1323 * @var: hw_params variable to apply the list of range constraints
1324 * @r: ranges
1325 *
1326 * Apply the list of range constraints to an interval parameter.
1327 *
1328 * Return: Zero if successful, or a negative error code on failure.
1329 */
1330int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1331 unsigned int cond,
1332 snd_pcm_hw_param_t var,
1333 const struct snd_pcm_hw_constraint_ranges *r)
1334{
1335 return snd_pcm_hw_rule_add(runtime, cond, var,
1336 snd_pcm_hw_rule_ranges, (void *)r,
1337 var, -1);
1338}
1339EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
1340
877211f5
TI		 1341static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1342 struct snd_pcm_hw_rule *rule)
1da177e4 1343{
e5e113cf 1344 const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1da177e4
LT		 1345 unsigned int num = 0, den = 0;
1346 int err;
1347 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1348 r->nrats, r->rats, &num, &den);
1349 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1350 params->rate_num = num;
1351 params->rate_den = den;
1352 }
1353 return err;
1354}
1355
1356/**
1c85cc64 1357 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
df8db936
TI		 1358 * @runtime: PCM runtime instance
1359 * @cond: condition bits
1360 * @var: hw_params variable to apply the ratnums constraint
877211f5 1361 * @r: struct snd_ratnums constriants
eb7c06e8
YB		 1362 *
1363 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1364 */
877211f5 1365int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1da177e4
LT		 1366 unsigned int cond,
1367 snd_pcm_hw_param_t var,
e5e113cf 1368 const struct snd_pcm_hw_constraint_ratnums *r)
1da177e4
LT		 1369{
1370 return snd_pcm_hw_rule_add(runtime, cond, var,
e5e113cf 1371 snd_pcm_hw_rule_ratnums, (void *)r,
1da177e4
LT		 1372 var, -1);
1373}
1374
e88e8ae6
TI		 1375EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1376
877211f5
TI		 1377static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1378 struct snd_pcm_hw_rule *rule)
1da177e4 1379{
e5e113cf 1380 const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1da177e4
LT		 1381 unsigned int num = 0, den = 0;
1382 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1383 r->nrats, r->rats, &num, &den);
1384 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1385 params->rate_num = num;
1386 params->rate_den = den;
1387 }
1388 return err;
1389}
1390
1391/**
1c85cc64 1392 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
df8db936
TI		 1393 * @runtime: PCM runtime instance
1394 * @cond: condition bits
1395 * @var: hw_params variable to apply the ratdens constraint
877211f5 1396 * @r: struct snd_ratdens constriants
eb7c06e8
YB		 1397 *
1398 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1399 */
877211f5 1400int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1da177e4
LT		 1401 unsigned int cond,
1402 snd_pcm_hw_param_t var,
e5e113cf 1403 const struct snd_pcm_hw_constraint_ratdens *r)
1da177e4
LT		 1404{
1405 return snd_pcm_hw_rule_add(runtime, cond, var,
e5e113cf 1406 snd_pcm_hw_rule_ratdens, (void *)r,
1da177e4
LT		 1407 var, -1);
1408}
1409
e88e8ae6
TI		 1410EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1411
877211f5
TI		 1412static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1413 struct snd_pcm_hw_rule *rule)
1da177e4
LT		 1414{
1415 unsigned int l = (unsigned long) rule->private;
1416 int width = l & 0xffff;
1417 unsigned int msbits = l >> 16;
877211f5 1418 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
8ef9df55
LPC		 1419
1420 if (!snd_interval_single(i))
1421 return 0;
1422
1423 if ((snd_interval_value(i) == width) ||
1424 (width == 0 && snd_interval_value(i) > msbits))
19f52fae 1425 params->msbits = min_not_zero(params->msbits, msbits);
8ef9df55 1426
1da177e4
LT		 1427 return 0;
1428}
1429
1430/**
1c85cc64 1431 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
df8db936
TI		 1432 * @runtime: PCM runtime instance
1433 * @cond: condition bits
1434 * @width: sample bits width
1435 * @msbits: msbits width
eb7c06e8 1436 *
8ef9df55
LPC		 1437 * This constraint will set the number of most significant bits (msbits) if a
1438 * sample format with the specified width has been select. If width is set to 0
1439 * the msbits will be set for any sample format with a width larger than the
1440 * specified msbits.
1441 *
eb7c06e8 1442 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1443 */
877211f5 1444int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1da177e4
LT		 1445 unsigned int cond,
1446 unsigned int width,
1447 unsigned int msbits)
1448{
1449 unsigned long l = (msbits << 16) | width;
1450 return snd_pcm_hw_rule_add(runtime, cond, -1,
1451 snd_pcm_hw_rule_msbits,
1452 (void*) l,
1453 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1454}
1455
e88e8ae6
TI		 1456EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1457
877211f5
TI		 1458static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1459 struct snd_pcm_hw_rule *rule)
1da177e4
LT		 1460{
1461 unsigned long step = (unsigned long) rule->private;
0f519b62 1462 return snd_interval_step(hw_param_interval(params, rule->var), step);
1da177e4
LT		 1463}
1464
1465/**
1c85cc64 1466 * snd_pcm_hw_constraint_step - add a hw constraint step rule
df8db936
TI		 1467 * @runtime: PCM runtime instance
1468 * @cond: condition bits
1469 * @var: hw_params variable to apply the step constraint
1470 * @step: step size
eb7c06e8
YB		 1471 *
1472 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1473 */
877211f5 1474int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1da177e4
LT		 1475 unsigned int cond,
1476 snd_pcm_hw_param_t var,
1477 unsigned long step)
1478{
1479 return snd_pcm_hw_rule_add(runtime, cond, var,
1480 snd_pcm_hw_rule_step, (void *) step,
1481 var, -1);
1482}
1483
e88e8ae6
TI		 1484EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1485
877211f5 1486static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1da177e4 1487{
67c39317 1488 static unsigned int pow2_sizes[] = {
1da177e4
LT		 1489 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1490 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1491 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1492 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1493 };
1494 return snd_interval_list(hw_param_interval(params, rule->var),
1495 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1496}
1497
1498/**
1c85cc64 1499 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
df8db936
TI		 1500 * @runtime: PCM runtime instance
1501 * @cond: condition bits
1502 * @var: hw_params variable to apply the power-of-2 constraint
eb7c06e8
YB		 1503 *
1504 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1505 */
877211f5 1506int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1da177e4
LT		 1507 unsigned int cond,
1508 snd_pcm_hw_param_t var)
1509{
1510 return snd_pcm_hw_rule_add(runtime, cond, var,
1511 snd_pcm_hw_rule_pow2, NULL,
1512 var, -1);
1513}
1514
e88e8ae6
TI		 1515EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1516
d5b702a6
CL		 1517static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1518 struct snd_pcm_hw_rule *rule)
1519{
1520 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1521 struct snd_interval *rate;
1522
1523 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1524 return snd_interval_list(rate, 1, &base_rate, 0);
1525}
1526
1527/**
1528 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1529 * @runtime: PCM runtime instance
1530 * @base_rate: the rate at which the hardware does not resample
eb7c06e8
YB		 1531 *
1532 * Return: Zero if successful, or a negative error code on failure.
d5b702a6
CL		 1533 */
1534int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1535 unsigned int base_rate)
1536{
1537 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1538 SNDRV_PCM_HW_PARAM_RATE,
1539 snd_pcm_hw_rule_noresample_func,
1540 (void *)(uintptr_t)base_rate,
1541 SNDRV_PCM_HW_PARAM_RATE, -1);
1542}
1543EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1544
877211f5 1545static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
123992f7 1546 snd_pcm_hw_param_t var)
1da177e4
LT		 1547{
1548 if (hw_is_mask(var)) {
1549 snd_mask_any(hw_param_mask(params, var));
1550 params->cmask |= 1 << var;
1551 params->rmask |= 1 << var;
1552 return;
1553 }
1554 if (hw_is_interval(var)) {
1555 snd_interval_any(hw_param_interval(params, var));
1556 params->cmask |= 1 << var;
1557 params->rmask |= 1 << var;
1558 return;
1559 }
1560 snd_BUG();
1561}
1562
877211f5 1563void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1da177e4
LT		 1564{
1565 unsigned int k;
1566 memset(params, 0, sizeof(*params));
1567 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1568 _snd_pcm_hw_param_any(params, k);
1569 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1570 _snd_pcm_hw_param_any(params, k);
1571 params->info = ~0U;
1572}
1573
e88e8ae6 1574EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1da177e4
LT		 1575
1576/**
1c85cc64 1577 * snd_pcm_hw_param_value - return @params field @var value
df8db936
TI		 1578 * @params: the hw_params instance
1579 * @var: parameter to retrieve
1c85cc64 1580 * @dir: pointer to the direction (-1,0,1) or %NULL
1da177e4 1581 *
eb7c06e8
YB		 1582 * Return: The value for field @var if it's fixed in configuration space
1583 * defined by @params. -%EINVAL otherwise.
1da177e4 1584 */
e88e8ae6
TI		 1585int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1586 snd_pcm_hw_param_t var, int *dir)
1da177e4
LT		 1587{
1588 if (hw_is_mask(var)) {
877211f5 1589 const struct snd_mask *mask = hw_param_mask_c(params, var);
1da177e4
LT		 1590 if (!snd_mask_single(mask))
1591 return -EINVAL;
1592 if (dir)
1593 *dir = 0;
1594 return snd_mask_value(mask);
1595 }
1596 if (hw_is_interval(var)) {
877211f5 1597 const struct snd_interval *i = hw_param_interval_c(params, var);
1da177e4
LT		 1598 if (!snd_interval_single(i))
1599 return -EINVAL;
1600 if (dir)
1601 *dir = i->openmin;
1602 return snd_interval_value(i);
1603 }
1da177e4
LT		 1604 return -EINVAL;
1605}
1606
e88e8ae6 1607EXPORT_SYMBOL(snd_pcm_hw_param_value);
1da177e4 1608
877211f5 1609void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1da177e4
LT		 1610 snd_pcm_hw_param_t var)
1611{
1612 if (hw_is_mask(var)) {
1613 snd_mask_none(hw_param_mask(params, var));
1614 params->cmask |= 1 << var;
1615 params->rmask |= 1 << var;
1616 } else if (hw_is_interval(var)) {
1617 snd_interval_none(hw_param_interval(params, var));
1618 params->cmask |= 1 << var;
1619 params->rmask |= 1 << var;
1620 } else {
1621 snd_BUG();
1622 }
1623}
1624
e88e8ae6 1625EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1da177e4 1626
877211f5 1627static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
123992f7 1628 snd_pcm_hw_param_t var)
1da177e4
LT		 1629{
1630 int changed;
1631 if (hw_is_mask(var))
1632 changed = snd_mask_refine_first(hw_param_mask(params, var));
1633 else if (hw_is_interval(var))
1634 changed = snd_interval_refine_first(hw_param_interval(params, var));
2f4ca8e5 1635 else
1da177e4 1636 return -EINVAL;
1da177e4
LT		 1637 if (changed) {
1638 params->cmask |= 1 << var;
1639 params->rmask |= 1 << var;
1640 }
1641 return changed;
1642}
1643
1644
1645/**
1c85cc64 1646 * snd_pcm_hw_param_first - refine config space and return minimum value
df8db936
TI		 1647 * @pcm: PCM instance
1648 * @params: the hw_params instance
1649 * @var: parameter to retrieve
1c85cc64 1650 * @dir: pointer to the direction (-1,0,1) or %NULL
1da177e4 1651 *
1c85cc64 1652 * Inside configuration space defined by @params remove from @var all
1da177e4 1653 * values > minimum. Reduce configuration space accordingly.
eb7c06e8
YB		 1654 *
1655 * Return: The minimum, or a negative error code on failure.
1da177e4 1656 */
e88e8ae6
TI		 1657int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1658 struct snd_pcm_hw_params *params,
1659 snd_pcm_hw_param_t var, int *dir)
1da177e4
LT		 1660{
1661 int changed = _snd_pcm_hw_param_first(params, var);
1662 if (changed < 0)
1663 return changed;
1664 if (params->rmask) {
1665 int err = snd_pcm_hw_refine(pcm, params);
7eaa943c
TI		 1666 if (snd_BUG_ON(err < 0))
1667 return err;
1da177e4
LT		 1668 }
1669 return snd_pcm_hw_param_value(params, var, dir);
1670}
1671
e88e8ae6
TI		 1672EXPORT_SYMBOL(snd_pcm_hw_param_first);
1673
877211f5 1674static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
123992f7 1675 snd_pcm_hw_param_t var)
1da177e4
LT		 1676{
1677 int changed;
1678 if (hw_is_mask(var))
1679 changed = snd_mask_refine_last(hw_param_mask(params, var));
1680 else if (hw_is_interval(var))
1681 changed = snd_interval_refine_last(hw_param_interval(params, var));
2f4ca8e5 1682 else
1da177e4 1683 return -EINVAL;
1da177e4
LT		 1684 if (changed) {
1685 params->cmask |= 1 << var;
1686 params->rmask |= 1 << var;
1687 }
1688 return changed;
1689}
1690
1691
1692/**
1c85cc64 1693 * snd_pcm_hw_param_last - refine config space and return maximum value
df8db936
TI		 1694 * @pcm: PCM instance
1695 * @params: the hw_params instance
1696 * @var: parameter to retrieve
1c85cc64 1697 * @dir: pointer to the direction (-1,0,1) or %NULL
1da177e4 1698 *
1c85cc64 1699 * Inside configuration space defined by @params remove from @var all
1da177e4 1700 * values < maximum. Reduce configuration space accordingly.
eb7c06e8
YB		 1701 *
1702 * Return: The maximum, or a negative error code on failure.
1da177e4 1703 */
e88e8ae6
TI		 1704int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1705 struct snd_pcm_hw_params *params,
1706 snd_pcm_hw_param_t var, int *dir)
1da177e4
LT		 1707{
1708 int changed = _snd_pcm_hw_param_last(params, var);
1709 if (changed < 0)
1710 return changed;
1711 if (params->rmask) {
1712 int err = snd_pcm_hw_refine(pcm, params);
7eaa943c
TI		 1713 if (snd_BUG_ON(err < 0))
1714 return err;
1da177e4
LT		 1715 }
1716 return snd_pcm_hw_param_value(params, var, dir);
1717}
1718
e88e8ae6 1719EXPORT_SYMBOL(snd_pcm_hw_param_last);
1da177e4
LT		 1720
1721/**
1c85cc64 1722 * snd_pcm_hw_param_choose - choose a configuration defined by @params
df8db936
TI		 1723 * @pcm: PCM instance
1724 * @params: the hw_params instance
1da177e4 1725 *
1c85cc64 1726 * Choose one configuration from configuration space defined by @params.
1da177e4
LT		 1727 * The configuration chosen is that obtained fixing in this order:
1728 * first access, first format, first subformat, min channels,
1729 * min rate, min period time, max buffer size, min tick time
eb7c06e8
YB		 1730 *
1731 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1732 */
2f4ca8e5
TI		 1733int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1734 struct snd_pcm_hw_params *params)
1da177e4 1735{
2f4ca8e5
TI		 1736 static int vars[] = {
1737 SNDRV_PCM_HW_PARAM_ACCESS,
1738 SNDRV_PCM_HW_PARAM_FORMAT,
1739 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1740 SNDRV_PCM_HW_PARAM_CHANNELS,
1741 SNDRV_PCM_HW_PARAM_RATE,
1742 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1743 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1744 SNDRV_PCM_HW_PARAM_TICK_TIME,
1745 -1
1746 };
1747 int err, *v;
1da177e4 1748
2f4ca8e5
TI		 1749 for (v = vars; *v != -1; v++) {
1750 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1751 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1752 else
1753 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
7eaa943c
TI		 1754 if (snd_BUG_ON(err < 0))
1755 return err;
2f4ca8e5 1756 }
1da177e4
LT		 1757 return 0;
1758}
1759
877211f5 1760static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1da177e4
LT		 1761 void *arg)
1762{
877211f5 1763 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1764 unsigned long flags;
1765 snd_pcm_stream_lock_irqsave(substream, flags);
1766 if (snd_pcm_running(substream) &&
1767 snd_pcm_update_hw_ptr(substream) >= 0)
1768 runtime->status->hw_ptr %= runtime->buffer_size;
0e8014d7 1769 else {
1da177e4 1770 runtime->status->hw_ptr = 0;
0e8014d7
PLB		 1771 runtime->hw_ptr_wrap = 0;
1772 }
1da177e4
LT		 1773 snd_pcm_stream_unlock_irqrestore(substream, flags);
1774 return 0;
1775}
1776
877211f5 1777static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1da177e4
LT		 1778 void *arg)
1779{
877211f5
TI		 1780 struct snd_pcm_channel_info *info = arg;
1781 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1782 int width;
1783 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1784 info->offset = -1;
1785 return 0;
1786 }
1787 width = snd_pcm_format_physical_width(runtime->format);
1788 if (width < 0)
1789 return width;
1790 info->offset = 0;
1791 switch (runtime->access) {
1792 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1793 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1794 info->first = info->channel * width;
1795 info->step = runtime->channels * width;
1796 break;
1797 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1798 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1799 {
1800 size_t size = runtime->dma_bytes / runtime->channels;
1801 info->first = info->channel * size * 8;
1802 info->step = width;
1803 break;
1804 }
1805 default:
1806 snd_BUG();
1807 break;
1808 }
1809 return 0;
1810}
1811
8bea869c
JK		 1812static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1813 void *arg)
1814{
1815 struct snd_pcm_hw_params *params = arg;
1816 snd_pcm_format_t format;
a9960e6a
CL		 1817 int channels;
1818 ssize_t frame_size;
8bea869c
JK		 1819
1820 params->fifo_size = substream->runtime->hw.fifo_size;
1821 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1822 format = params_format(params);
1823 channels = params_channels(params);
a9960e6a
CL		 1824 frame_size = snd_pcm_format_size(format, channels);
1825 if (frame_size > 0)
1826 params->fifo_size /= (unsigned)frame_size;
8bea869c
JK		 1827 }
1828 return 0;
1829}
1830
1da177e4
LT		 1831/**
1832 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1833 * @substream: the pcm substream instance
1834 * @cmd: ioctl command
1835 * @arg: ioctl argument
1836 *
1837 * Processes the generic ioctl commands for PCM.
1838 * Can be passed as the ioctl callback for PCM ops.
1839 *
eb7c06e8 1840 * Return: Zero if successful, or a negative error code on failure.
1da177e4 1841 */
877211f5 1842int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1da177e4
LT		 1843 unsigned int cmd, void *arg)
1844{
1845 switch (cmd) {
1846 case SNDRV_PCM_IOCTL1_INFO:
1847 return 0;
1848 case SNDRV_PCM_IOCTL1_RESET:
1849 return snd_pcm_lib_ioctl_reset(substream, arg);
1850 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1851 return snd_pcm_lib_ioctl_channel_info(substream, arg);
8bea869c
JK		 1852 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1853 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1da177e4
LT		 1854 }
1855 return -ENXIO;
1856}
1857
e88e8ae6
TI		 1858EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1859
1da177e4
LT		 1860/**
1861 * snd_pcm_period_elapsed - update the pcm status for the next period
1862 * @substream: the pcm substream instance
1863 *
1864 * This function is called from the interrupt handler when the
1865 * PCM has processed the period size. It will update the current
31e8960b 1866 * pointer, wake up sleepers, etc.
1da177e4
LT		 1867 *
1868 * Even if more than one periods have elapsed since the last call, you
1869 * have to call this only once.
1870 */
877211f5 1871void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1da177e4 1872{
877211f5 1873 struct snd_pcm_runtime *runtime;
1da177e4
LT		 1874 unsigned long flags;
1875
7eaa943c
TI		 1876 if (PCM_RUNTIME_CHECK(substream))
1877 return;
1da177e4 1878 runtime = substream->runtime;
1da177e4 1879
1da177e4
LT		 1880 snd_pcm_stream_lock_irqsave(substream, flags);
1881 if (!snd_pcm_running(substream) ||
f240406b 1882 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1da177e4
LT		 1883 goto _end;
1884
90bbaf66 1885#ifdef CONFIG_SND_PCM_TIMER
1da177e4
LT		 1886 if (substream->timer_running)
1887 snd_timer_interrupt(substream->timer, 1);
90bbaf66 1888#endif
1da177e4 1889 _end:
1da177e4 1890 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
3aa02cb6 1891 snd_pcm_stream_unlock_irqrestore(substream, flags);
1da177e4
LT		 1892}
1893
e88e8ae6
TI		 1894EXPORT_SYMBOL(snd_pcm_period_elapsed);
1895
13075510
TI		 1896/*
1897 * Wait until avail_min data becomes available
1898 * Returns a negative error code if any error occurs during operation.
1899 * The available space is stored on availp. When err = 0 and avail = 0
1900 * on the capture stream, it indicates the stream is in DRAINING state.
1901 */
5daeba34 1902static int wait_for_avail(struct snd_pcm_substream *substream,
13075510
TI		 1903 snd_pcm_uframes_t *availp)
1904{
1905 struct snd_pcm_runtime *runtime = substream->runtime;
1906 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1907 wait_queue_t wait;
1908 int err = 0;
1909 snd_pcm_uframes_t avail = 0;
f2b3614c
TI		 1910 long wait_time, tout;
1911
763437a9
AV		 1912 init_waitqueue_entry(&wait, current);
1913 set_current_state(TASK_INTERRUPTIBLE);
1914 add_wait_queue(&runtime->tsleep, &wait);
1915
f2b3614c
TI		 1916 if (runtime->no_period_wakeup)
1917 wait_time = MAX_SCHEDULE_TIMEOUT;
1918 else {
1919 wait_time = 10;
1920 if (runtime->rate) {
1921 long t = runtime->period_size * 2 / runtime->rate;
1922 wait_time = max(t, wait_time);
1923 }
1924 wait_time = msecs_to_jiffies(wait_time * 1000);
1925 }
763437a9 1926
13075510
TI		 1927 for (;;) {
1928 if (signal_pending(current)) {
1929 err = -ERESTARTSYS;
1930 break;
1931 }
763437a9
AV		 1932
1933 /*
1934 * We need to check if space became available already
1935 * (and thus the wakeup happened already) first to close
1936 * the race of space already having become available.
1937 * This check must happen after been added to the waitqueue
1938 * and having current state be INTERRUPTIBLE.
1939 */
1940 if (is_playback)
1941 avail = snd_pcm_playback_avail(runtime);
1942 else
1943 avail = snd_pcm_capture_avail(runtime);
1944 if (avail >= runtime->twake)
1945 break;
13075510 1946 snd_pcm_stream_unlock_irq(substream);
763437a9
AV		 1947
1948 tout = schedule_timeout(wait_time);
1949
13075510 1950 snd_pcm_stream_lock_irq(substream);
763437a9 1951 set_current_state(TASK_INTERRUPTIBLE);
13075510
TI		 1952 switch (runtime->status->state) {
1953 case SNDRV_PCM_STATE_SUSPENDED:
1954 err = -ESTRPIPE;
1955 goto _endloop;
1956 case SNDRV_PCM_STATE_XRUN:
1957 err = -EPIPE;
1958 goto _endloop;
1959 case SNDRV_PCM_STATE_DRAINING:
1960 if (is_playback)
1961 err = -EPIPE;
1962 else
1963 avail = 0; /* indicate draining */
1964 goto _endloop;
1965 case SNDRV_PCM_STATE_OPEN:
1966 case SNDRV_PCM_STATE_SETUP:
1967 case SNDRV_PCM_STATE_DISCONNECTED:
1968 err = -EBADFD;
1969 goto _endloop;
ed697e1a
JK		 1970 case SNDRV_PCM_STATE_PAUSED:
1971 continue;
13075510
TI		 1972 }
1973 if (!tout) {
09e56df8
TI		 1974 pcm_dbg(substream->pcm,
1975 "%s write error (DMA or IRQ trouble?)\n",
1976 is_playback ? "playback" : "capture");
13075510
TI		 1977 err = -EIO;
1978 break;
1979 }
13075510
TI		 1980 }
1981 _endloop:
763437a9 1982 set_current_state(TASK_RUNNING);
c91a988d 1983 remove_wait_queue(&runtime->tsleep, &wait);
13075510
TI		 1984 *availp = avail;
1985 return err;
1986}
1987
877211f5 1988static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1da177e4
LT		 1989 unsigned int hwoff,
1990 unsigned long data, unsigned int off,
1991 snd_pcm_uframes_t frames)
1992{
877211f5 1993 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 1994 int err;
1995 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1996 if (substream->ops->copy) {
1997 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1998 return err;
1999 } else {
2000 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1da177e4
LT		 2001 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
2002 return -EFAULT;
2003 }
2004 return 0;
2005}
2006
877211f5 2007typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1da177e4
LT		 2008 unsigned long data, unsigned int off,
2009 snd_pcm_uframes_t size);
2010
877211f5 2011static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1da177e4
LT		 2012 unsigned long data,
2013 snd_pcm_uframes_t size,
2014 int nonblock,
2015 transfer_f transfer)
2016{
877211f5 2017 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 2018 snd_pcm_uframes_t xfer = 0;
2019 snd_pcm_uframes_t offset = 0;
0910c216 2020 snd_pcm_uframes_t avail;
1da177e4
LT		 2021 int err = 0;
2022
2023 if (size == 0)
2024 return 0;
1da177e4
LT		 2025
2026 snd_pcm_stream_lock_irq(substream);
2027 switch (runtime->status->state) {
2028 case SNDRV_PCM_STATE_PREPARED:
2029 case SNDRV_PCM_STATE_RUNNING:
2030 case SNDRV_PCM_STATE_PAUSED:
2031 break;
2032 case SNDRV_PCM_STATE_XRUN:
2033 err = -EPIPE;
2034 goto _end_unlock;
2035 case SNDRV_PCM_STATE_SUSPENDED:
2036 err = -ESTRPIPE;
2037 goto _end_unlock;
2038 default:
2039 err = -EBADFD;
2040 goto _end_unlock;
2041 }
2042
5daeba34 2043 runtime->twake = runtime->control->avail_min ? : 1;
0910c216
TI		 2044 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2045 snd_pcm_update_hw_ptr(substream);
2046 avail = snd_pcm_playback_avail(runtime);
1da177e4
LT		 2047 while (size > 0) {
2048 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1da177e4 2049 snd_pcm_uframes_t cont;
13075510 2050 if (!avail) {
1da177e4
LT		 2051 if (nonblock) {
2052 err = -EAGAIN;
2053 goto _end_unlock;
2054 }
5daeba34
DD		 2055 runtime->twake = min_t(snd_pcm_uframes_t, size,
2056 runtime->control->avail_min ? : 1);
2057 err = wait_for_avail(substream, &avail);
13075510 2058 if (err < 0)
443feb88 2059 goto _end_unlock;
1da177e4 2060 }
1da177e4
LT		 2061 frames = size > avail ? avail : size;
2062 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2063 if (frames > cont)
2064 frames = cont;
7eaa943c 2065 if (snd_BUG_ON(!frames)) {
c91a988d 2066 runtime->twake = 0;
7eaa943c
TI		 2067 snd_pcm_stream_unlock_irq(substream);
2068 return -EINVAL;
2069 }
1da177e4
LT		 2070 appl_ptr = runtime->control->appl_ptr;
2071 appl_ofs = appl_ptr % runtime->buffer_size;
2072 snd_pcm_stream_unlock_irq(substream);
1250932e 2073 err = transfer(substream, appl_ofs, data, offset, frames);
1da177e4 2074 snd_pcm_stream_lock_irq(substream);
1250932e
JK		 2075 if (err < 0)
2076 goto _end_unlock;
1da177e4
LT		 2077 switch (runtime->status->state) {
2078 case SNDRV_PCM_STATE_XRUN:
2079 err = -EPIPE;
2080 goto _end_unlock;
2081 case SNDRV_PCM_STATE_SUSPENDED:
2082 err = -ESTRPIPE;
2083 goto _end_unlock;
2084 default:
2085 break;
2086 }
2087 appl_ptr += frames;
2088 if (appl_ptr >= runtime->boundary)
2089 appl_ptr -= runtime->boundary;
2090 runtime->control->appl_ptr = appl_ptr;
2091 if (substream->ops->ack)
2092 substream->ops->ack(substream);
2093
2094 offset += frames;
2095 size -= frames;
2096 xfer += frames;
0910c216 2097 avail -= frames;
1da177e4
LT		 2098 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2099 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2100 err = snd_pcm_start(substream);
2101 if (err < 0)
2102 goto _end_unlock;
2103 }
1da177e4
LT		 2104 }
2105 _end_unlock:
c91a988d 2106 runtime->twake = 0;
1250932e
JK		 2107 if (xfer > 0 && err >= 0)
2108 snd_pcm_update_state(substream, runtime);
1da177e4 2109 snd_pcm_stream_unlock_irq(substream);
1da177e4
LT		 2110 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2111}
2112
7eaa943c
TI		 2113/* sanity-check for read/write methods */
2114static int pcm_sanity_check(struct snd_pcm_substream *substream)
1da177e4 2115{
877211f5 2116 struct snd_pcm_runtime *runtime;
7eaa943c
TI		 2117 if (PCM_RUNTIME_CHECK(substream))
2118 return -ENXIO;
1da177e4 2119 runtime = substream->runtime;
7eaa943c
TI		 2120 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
2121 return -EINVAL;
1da177e4
LT		 2122 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2123 return -EBADFD;
7eaa943c
TI		 2124 return 0;
2125}
2126
2127snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2128{
2129 struct snd_pcm_runtime *runtime;
2130 int nonblock;
2131 int err;
1da177e4 2132
7eaa943c
TI		 2133 err = pcm_sanity_check(substream);
2134 if (err < 0)
2135 return err;
2136 runtime = substream->runtime;
0df63e44 2137 nonblock = !!(substream->f_flags & O_NONBLOCK);
1da177e4
LT		 2138
2139 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2140 runtime->channels > 1)
2141 return -EINVAL;
2142 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2143 snd_pcm_lib_write_transfer);
2144}
2145
e88e8ae6
TI		 2146EXPORT_SYMBOL(snd_pcm_lib_write);
2147
877211f5 2148static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1da177e4
LT		 2149 unsigned int hwoff,
2150 unsigned long data, unsigned int off,
2151 snd_pcm_uframes_t frames)
2152{
877211f5 2153 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 2154 int err;
2155 void __user **bufs = (void __user **)data;
2156 int channels = runtime->channels;
2157 int c;
2158 if (substream->ops->copy) {
7eaa943c
TI		 2159 if (snd_BUG_ON(!substream->ops->silence))
2160 return -EINVAL;
1da177e4
LT		 2161 for (c = 0; c < channels; ++c, ++bufs) {
2162 if (*bufs == NULL) {
2163 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2164 return err;
2165 } else {
2166 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2167 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2168 return err;
2169 }
2170 }
2171 } else {
2172 /* default transfer behaviour */
2173 size_t dma_csize = runtime->dma_bytes / channels;
1da177e4
LT		 2174 for (c = 0; c < channels; ++c, ++bufs) {
2175 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2176 if (*bufs == NULL) {
2177 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2178 } else {
2179 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2180 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2181 return -EFAULT;
2182 }
2183 }
2184 }
2185 return 0;
2186}
2187
877211f5 2188snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1da177e4
LT		 2189 void __user **bufs,
2190 snd_pcm_uframes_t frames)
2191{
877211f5 2192 struct snd_pcm_runtime *runtime;
1da177e4 2193 int nonblock;
7eaa943c 2194 int err;
1da177e4 2195
7eaa943c
TI		 2196 err = pcm_sanity_check(substream);
2197 if (err < 0)
2198 return err;
1da177e4 2199 runtime = substream->runtime;
0df63e44 2200 nonblock = !!(substream->f_flags & O_NONBLOCK);
1da177e4
LT		 2201
2202 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2203 return -EINVAL;
2204 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2205 nonblock, snd_pcm_lib_writev_transfer);
2206}
2207
e88e8ae6
TI		 2208EXPORT_SYMBOL(snd_pcm_lib_writev);
2209
877211f5 2210static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
1da177e4
LT		 2211 unsigned int hwoff,
2212 unsigned long data, unsigned int off,
2213 snd_pcm_uframes_t frames)
2214{
877211f5 2215 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 2216 int err;
2217 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2218 if (substream->ops->copy) {
2219 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2220 return err;
2221 } else {
2222 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1da177e4
LT		 2223 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2224 return -EFAULT;
2225 }
2226 return 0;
2227}
2228
877211f5 2229static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
1da177e4
LT		 2230 unsigned long data,
2231 snd_pcm_uframes_t size,
2232 int nonblock,
2233 transfer_f transfer)
2234{
877211f5 2235 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 2236 snd_pcm_uframes_t xfer = 0;
2237 snd_pcm_uframes_t offset = 0;
0910c216 2238 snd_pcm_uframes_t avail;
1da177e4
LT		 2239 int err = 0;
2240
2241 if (size == 0)
2242 return 0;
1da177e4
LT		 2243
2244 snd_pcm_stream_lock_irq(substream);
2245 switch (runtime->status->state) {
2246 case SNDRV_PCM_STATE_PREPARED:
2247 if (size >= runtime->start_threshold) {
2248 err = snd_pcm_start(substream);
2249 if (err < 0)
2250 goto _end_unlock;
2251 }
2252 break;
2253 case SNDRV_PCM_STATE_DRAINING:
2254 case SNDRV_PCM_STATE_RUNNING:
2255 case SNDRV_PCM_STATE_PAUSED:
2256 break;
2257 case SNDRV_PCM_STATE_XRUN:
2258 err = -EPIPE;
2259 goto _end_unlock;
2260 case SNDRV_PCM_STATE_SUSPENDED:
2261 err = -ESTRPIPE;
2262 goto _end_unlock;
2263 default:
2264 err = -EBADFD;
2265 goto _end_unlock;
2266 }
2267
5daeba34 2268 runtime->twake = runtime->control->avail_min ? : 1;
0910c216
TI		 2269 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2270 snd_pcm_update_hw_ptr(substream);
2271 avail = snd_pcm_capture_avail(runtime);
1da177e4
LT		 2272 while (size > 0) {
2273 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1da177e4 2274 snd_pcm_uframes_t cont;
13075510
TI		 2275 if (!avail) {
2276 if (runtime->status->state ==
2277 SNDRV_PCM_STATE_DRAINING) {
2278 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1da177e4
LT		 2279 goto _end_unlock;
2280 }
1da177e4
LT		 2281 if (nonblock) {
2282 err = -EAGAIN;
2283 goto _end_unlock;
2284 }
5daeba34
DD		 2285 runtime->twake = min_t(snd_pcm_uframes_t, size,
2286 runtime->control->avail_min ? : 1);
2287 err = wait_for_avail(substream, &avail);
13075510 2288 if (err < 0)
443feb88 2289 goto _end_unlock;
13075510
TI		 2290 if (!avail)
2291 continue; /* draining */
1da177e4 2292 }
1da177e4
LT		 2293 frames = size > avail ? avail : size;
2294 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2295 if (frames > cont)
2296 frames = cont;
7eaa943c 2297 if (snd_BUG_ON(!frames)) {
c91a988d 2298 runtime->twake = 0;
7eaa943c
TI		 2299 snd_pcm_stream_unlock_irq(substream);
2300 return -EINVAL;
2301 }
1da177e4
LT		 2302 appl_ptr = runtime->control->appl_ptr;
2303 appl_ofs = appl_ptr % runtime->buffer_size;
2304 snd_pcm_stream_unlock_irq(substream);
1250932e 2305 err = transfer(substream, appl_ofs, data, offset, frames);
1da177e4 2306 snd_pcm_stream_lock_irq(substream);
1250932e
JK		 2307 if (err < 0)
2308 goto _end_unlock;
1da177e4
LT		 2309 switch (runtime->status->state) {
2310 case SNDRV_PCM_STATE_XRUN:
2311 err = -EPIPE;
2312 goto _end_unlock;
2313 case SNDRV_PCM_STATE_SUSPENDED:
2314 err = -ESTRPIPE;
2315 goto _end_unlock;
2316 default:
2317 break;
2318 }
2319 appl_ptr += frames;
2320 if (appl_ptr >= runtime->boundary)
2321 appl_ptr -= runtime->boundary;
2322 runtime->control->appl_ptr = appl_ptr;
2323 if (substream->ops->ack)
2324 substream->ops->ack(substream);
2325
2326 offset += frames;
2327 size -= frames;
2328 xfer += frames;
0910c216 2329 avail -= frames;
1da177e4
LT		 2330 }
2331 _end_unlock:
c91a988d 2332 runtime->twake = 0;
1250932e
JK		 2333 if (xfer > 0 && err >= 0)
2334 snd_pcm_update_state(substream, runtime);
1da177e4 2335 snd_pcm_stream_unlock_irq(substream);
1da177e4
LT		 2336 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2337}
2338
877211f5 2339snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
1da177e4 2340{
877211f5 2341 struct snd_pcm_runtime *runtime;
1da177e4 2342 int nonblock;
7eaa943c 2343 int err;
1da177e4 2344
7eaa943c
TI		 2345 err = pcm_sanity_check(substream);
2346 if (err < 0)
2347 return err;
1da177e4 2348 runtime = substream->runtime;
0df63e44 2349 nonblock = !!(substream->f_flags & O_NONBLOCK);
1da177e4
LT		 2350 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2351 return -EINVAL;
2352 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2353}
2354
e88e8ae6
TI		 2355EXPORT_SYMBOL(snd_pcm_lib_read);
2356
877211f5 2357static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
1da177e4
LT		 2358 unsigned int hwoff,
2359 unsigned long data, unsigned int off,
2360 snd_pcm_uframes_t frames)
2361{
877211f5 2362 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 2363 int err;
2364 void __user **bufs = (void __user **)data;
2365 int channels = runtime->channels;
2366 int c;
2367 if (substream->ops->copy) {
2368 for (c = 0; c < channels; ++c, ++bufs) {
2369 char __user *buf;
2370 if (*bufs == NULL)
2371 continue;
2372 buf = *bufs + samples_to_bytes(runtime, off);
2373 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2374 return err;
2375 }
2376 } else {
2377 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
1da177e4
LT		 2378 for (c = 0; c < channels; ++c, ++bufs) {
2379 char *hwbuf;
2380 char __user *buf;
2381 if (*bufs == NULL)
2382 continue;
2383
2384 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2385 buf = *bufs + samples_to_bytes(runtime, off);
2386 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2387 return -EFAULT;
2388 }
2389 }
2390 return 0;
2391}
2392
877211f5 2393snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1da177e4
LT		 2394 void __user **bufs,
2395 snd_pcm_uframes_t frames)
2396{
877211f5 2397 struct snd_pcm_runtime *runtime;
1da177e4 2398 int nonblock;
7eaa943c 2399 int err;
1da177e4 2400
7eaa943c
TI		 2401 err = pcm_sanity_check(substream);
2402 if (err < 0)
2403 return err;
1da177e4 2404 runtime = substream->runtime;
1da177e4
LT		 2405 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2406 return -EBADFD;
2407
0df63e44 2408 nonblock = !!(substream->f_flags & O_NONBLOCK);
1da177e4
LT		 2409 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2410 return -EINVAL;
2411 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2412}
2413
1da177e4 2414EXPORT_SYMBOL(snd_pcm_lib_readv);
2d3391ec
TI		 2415
2416/*
2417 * standard channel mapping helpers
2418 */
2419
2420/* default channel maps for multi-channel playbacks, up to 8 channels */
2421const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2422 { .channels = 1,
5efbc261 2423 .map = { SNDRV_CHMAP_MONO } },
2d3391ec
TI		 2424 { .channels = 2,
2425 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2426 { .channels = 4,
2427 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2428 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2429 { .channels = 6,
2430 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2431 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2432 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2433 { .channels = 8,
2434 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2435 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2436 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2437 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2438 { }
2439};
2440EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2441
2442/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2443const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2444 { .channels = 1,
5efbc261 2445 .map = { SNDRV_CHMAP_MONO } },
2d3391ec
TI		 2446 { .channels = 2,
2447 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2448 { .channels = 4,
2449 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2450 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2451 { .channels = 6,
2452 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2453 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2454 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2455 { .channels = 8,
2456 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2457 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2458 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2459 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2460 { }
2461};
2462EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2463
2464static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2465{
2466 if (ch > info->max_channels)
2467 return false;
2468 return !info->channel_mask || (info->channel_mask & (1U << ch));
2469}
2470
2471static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2472 struct snd_ctl_elem_info *uinfo)
2473{
2474 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2475
2476 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2477 uinfo->count = 0;
2478 uinfo->count = info->max_channels;
2479 uinfo->value.integer.min = 0;
2480 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2481 return 0;
2482}
2483
2484/* get callback for channel map ctl element
2485 * stores the channel position firstly matching with the current channels
2486 */
2487static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2488 struct snd_ctl_elem_value *ucontrol)
2489{
2490 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2491 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2492 struct snd_pcm_substream *substream;
2493 const struct snd_pcm_chmap_elem *map;
2494
2deaeaf1 2495 if (!info->chmap)
2d3391ec
TI		 2496 return -EINVAL;
2497 substream = snd_pcm_chmap_substream(info, idx);
2498 if (!substream)
2499 return -ENODEV;
2500 memset(ucontrol->value.integer.value, 0,
2501 sizeof(ucontrol->value.integer.value));
2502 if (!substream->runtime)
2503 return 0; /* no channels set */
2504 for (map = info->chmap; map->channels; map++) {
2505 int i;
2506 if (map->channels == substream->runtime->channels &&
2507 valid_chmap_channels(info, map->channels)) {
2508 for (i = 0; i < map->channels; i++)
2509 ucontrol->value.integer.value[i] = map->map[i];
2510 return 0;
2511 }
2512 }
2513 return -EINVAL;
2514}
2515
2516/* tlv callback for channel map ctl element
2517 * expands the pre-defined channel maps in a form of TLV
2518 */
2519static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2520 unsigned int size, unsigned int __user *tlv)
2521{
2522 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2523 const struct snd_pcm_chmap_elem *map;
2524 unsigned int __user *dst;
2525 int c, count = 0;
2526
2deaeaf1 2527 if (!info->chmap)
2d3391ec
TI		 2528 return -EINVAL;
2529 if (size < 8)
2530 return -ENOMEM;
2531 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2532 return -EFAULT;
2533 size -= 8;
2534 dst = tlv + 2;
2535 for (map = info->chmap; map->channels; map++) {
2536 int chs_bytes = map->channels * 4;
2537 if (!valid_chmap_channels(info, map->channels))
2538 continue;
2539 if (size < 8)
2540 return -ENOMEM;
2541 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2542 put_user(chs_bytes, dst + 1))
2543 return -EFAULT;
2544 dst += 2;
2545 size -= 8;
2546 count += 8;
2547 if (size < chs_bytes)
2548 return -ENOMEM;
2549 size -= chs_bytes;
2550 count += chs_bytes;
2551 for (c = 0; c < map->channels; c++) {
2552 if (put_user(map->map[c], dst))
2553 return -EFAULT;
2554 dst++;
2555 }
2556 }
2557 if (put_user(count, tlv + 1))
2558 return -EFAULT;
2559 return 0;
2560}
2561
2562static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2563{
2564 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2565 info->pcm->streams[info->stream].chmap_kctl = NULL;
2566 kfree(info);
2567}
2568
2569/**
2570 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2571 * @pcm: the assigned PCM instance
2572 * @stream: stream direction
2573 * @chmap: channel map elements (for query)
2574 * @max_channels: the max number of channels for the stream
2575 * @private_value: the value passed to each kcontrol's private_value field
2576 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2577 *
2578 * Create channel-mapping control elements assigned to the given PCM stream(s).
eb7c06e8 2579 * Return: Zero if successful, or a negative error value.
2d3391ec
TI		 2580 */
2581int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2582 const struct snd_pcm_chmap_elem *chmap,
2583 int max_channels,
2584 unsigned long private_value,
2585 struct snd_pcm_chmap **info_ret)
2586{
2587 struct snd_pcm_chmap *info;
2588 struct snd_kcontrol_new knew = {
2589 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2590 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2d3391ec
TI		 2591 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2592 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2593 .info = pcm_chmap_ctl_info,
2594 .get = pcm_chmap_ctl_get,
2595 .tlv.c = pcm_chmap_ctl_tlv,
2596 };
2597 int err;
2598
8d879be8
TI		 2599 if (WARN_ON(pcm->streams[stream].chmap_kctl))
2600 return -EBUSY;
2d3391ec
TI		 2601 info = kzalloc(sizeof(*info), GFP_KERNEL);
2602 if (!info)
2603 return -ENOMEM;
2604 info->pcm = pcm;
2605 info->stream = stream;
2606 info->chmap = chmap;
2607 info->max_channels = max_channels;
2608 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2609 knew.name = "Playback Channel Map";
2610 else
2611 knew.name = "Capture Channel Map";
2612 knew.device = pcm->device;
2613 knew.count = pcm->streams[stream].substream_count;
2614 knew.private_value = private_value;
2615 info->kctl = snd_ctl_new1(&knew, info);
2616 if (!info->kctl) {
2617 kfree(info);
2618 return -ENOMEM;
2619 }
2620 info->kctl->private_free = pcm_chmap_ctl_private_free;
2621 err = snd_ctl_add(pcm->card, info->kctl);
2622 if (err < 0)
2623 return err;
2624 pcm->streams[stream].chmap_kctl = info->kctl;
2625 if (info_ret)
2626 *info_ret = info;
2627 return 0;
2628}
2629EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);
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