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jfs: don't allow os2 xattr namespace overlap with others
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / core / pcm_lib.c
blobe9d98be190c58db786c53ea8adc9770bd808d5ec
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Abramo Bagnara <abramo@alsa-project.org>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23 #include <linux/slab.h>
24 #include <linux/time.h>
25 #include <linux/math64.h>
26 #include <sound/core.h>
27 #include <sound/control.h>
28 #include <sound/info.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/timer.h>
32
33 /*
34 * fill ring buffer with silence
35 * runtime->silence_start: starting pointer to silence area
36 * runtime->silence_filled: size filled with silence
37 * runtime->silence_threshold: threshold from application
38 * runtime->silence_size: maximal size from application
39 *
40 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
41 */
42 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
43 {
44 struct snd_pcm_runtime *runtime = substream->runtime;
45 snd_pcm_uframes_t frames, ofs, transfer;
46
47 if (runtime->silence_size < runtime->boundary) {
48 snd_pcm_sframes_t noise_dist, n;
49 if (runtime->silence_start != runtime->control->appl_ptr) {
50 n = runtime->control->appl_ptr - runtime->silence_start;
51 if (n < 0)
52 n += runtime->boundary;
53 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
54 runtime->silence_filled -= n;
55 else
56 runtime->silence_filled = 0;
57 runtime->silence_start = runtime->control->appl_ptr;
58 }
59 if (runtime->silence_filled >= runtime->buffer_size)
60 return;
61 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
62 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
63 return;
64 frames = runtime->silence_threshold - noise_dist;
65 if (frames > runtime->silence_size)
66 frames = runtime->silence_size;
67 } else {
68 if (new_hw_ptr == ULONG_MAX) { /* initialization */
69 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
70 runtime->silence_filled = avail > 0 ? avail : 0;
71 runtime->silence_start = (runtime->status->hw_ptr +
72 runtime->silence_filled) %
73 runtime->boundary;
74 } else {
75 ofs = runtime->status->hw_ptr;
76 frames = new_hw_ptr - ofs;
77 if ((snd_pcm_sframes_t)frames < 0)
78 frames += runtime->boundary;
79 runtime->silence_filled -= frames;
80 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
81 runtime->silence_filled = 0;
82 runtime->silence_start = new_hw_ptr;
83 } else {
84 runtime->silence_start = ofs;
85 }
86 }
87 frames = runtime->buffer_size - runtime->silence_filled;
88 }
89 if (snd_BUG_ON(frames > runtime->buffer_size))
90 return;
91 if (frames == 0)
92 return;
93 ofs = runtime->silence_start % runtime->buffer_size;
94 while (frames > 0) {
95 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
96 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
97 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
98 if (substream->ops->silence) {
99 int err;
100 err = substream->ops->silence(substream, -1, ofs, transfer);
101 snd_BUG_ON(err < 0);
102 } else {
103 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
104 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
105 }
106 } else {
107 unsigned int c;
108 unsigned int channels = runtime->channels;
109 if (substream->ops->silence) {
110 for (c = 0; c < channels; ++c) {
111 int err;
112 err = substream->ops->silence(substream, c, ofs, transfer);
113 snd_BUG_ON(err < 0);
114 }
115 } else {
116 size_t dma_csize = runtime->dma_bytes / channels;
117 for (c = 0; c < channels; ++c) {
118 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
119 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
120 }
121 }
122 }
123 runtime->silence_filled += transfer;
124 frames -= transfer;
125 ofs = 0;
126 }
127 }
128
129 static void pcm_debug_name(struct snd_pcm_substream *substream,
130 char *name, size_t len)
131 {
132 snprintf(name, len, "pcmC%dD%d%c:%d",
133 substream->pcm->card->number,
134 substream->pcm->device,
135 substream->stream ? 'c' : 'p',
136 substream->number);
137 }
138
139 #define XRUN_DEBUG_BASIC (1<<0)
140 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
141 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
142 #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
143 #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
144 #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
145 #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
146
147 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
148
149 #define xrun_debug(substream, mask) \
150 ((substream)->pstr->xrun_debug & (mask))
151 #else
152 #define xrun_debug(substream, mask) 0
153 #endif
154
155 #define dump_stack_on_xrun(substream) do { \
156 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
157 dump_stack(); \
158 } while (0)
159
160 static void xrun(struct snd_pcm_substream *substream)
161 {
162 struct snd_pcm_runtime *runtime = substream->runtime;
163
164 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
165 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
166 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
167 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
168 char name[16];
169 pcm_debug_name(substream, name, sizeof(name));
170 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
171 dump_stack_on_xrun(substream);
172 }
173 }
174
175 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
176 #define hw_ptr_error(substream, fmt, args...) \
177 do { \
178 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
179 xrun_log_show(substream); \
180 if (printk_ratelimit()) { \
181 snd_printd("PCM: " fmt, ##args); \
182 } \
183 dump_stack_on_xrun(substream); \
184 } \
185 } while (0)
186
187 #define XRUN_LOG_CNT 10
188
189 struct hwptr_log_entry {
190 unsigned long jiffies;
191 snd_pcm_uframes_t pos;
192 snd_pcm_uframes_t period_size;
193 snd_pcm_uframes_t buffer_size;
194 snd_pcm_uframes_t old_hw_ptr;
195 snd_pcm_uframes_t hw_ptr_base;
196 };
197
198 struct snd_pcm_hwptr_log {
199 unsigned int idx;
200 unsigned int hit: 1;
201 struct hwptr_log_entry entries[XRUN_LOG_CNT];
202 };
203
204 static void xrun_log(struct snd_pcm_substream *substream,
205 snd_pcm_uframes_t pos)
206 {
207 struct snd_pcm_runtime *runtime = substream->runtime;
208 struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
209 struct hwptr_log_entry *entry;
210
211 if (log == NULL) {
212 log = kzalloc(sizeof(*log), GFP_ATOMIC);
213 if (log == NULL)
214 return;
215 runtime->hwptr_log = log;
216 } else {
217 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
218 return;
219 }
220 entry = &log->entries[log->idx];
221 entry->jiffies = jiffies;
222 entry->pos = pos;
223 entry->period_size = runtime->period_size;
224 entry->buffer_size = runtime->buffer_size;;
225 entry->old_hw_ptr = runtime->status->hw_ptr;
226 entry->hw_ptr_base = runtime->hw_ptr_base;
227 log->idx = (log->idx + 1) % XRUN_LOG_CNT;
228 }
229
230 static void xrun_log_show(struct snd_pcm_substream *substream)
231 {
232 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
233 struct hwptr_log_entry *entry;
234 char name[16];
235 unsigned int idx;
236 int cnt;
237
238 if (log == NULL)
239 return;
240 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
241 return;
242 pcm_debug_name(substream, name, sizeof(name));
243 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
244 entry = &log->entries[idx];
245 if (entry->period_size == 0)
246 break;
247 snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
248 "hwptr=%ld/%ld\n",
249 name, entry->jiffies, (unsigned long)entry->pos,
250 (unsigned long)entry->period_size,
251 (unsigned long)entry->buffer_size,
252 (unsigned long)entry->old_hw_ptr,
253 (unsigned long)entry->hw_ptr_base);
254 idx++;
255 idx %= XRUN_LOG_CNT;
256 }
257 log->hit = 1;
258 }
259
260 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
261
262 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
263 #define xrun_log(substream, pos) do { } while (0)
264 #define xrun_log_show(substream) do { } while (0)
265
266 #endif
267
268 int snd_pcm_update_state(struct snd_pcm_substream *substream,
269 struct snd_pcm_runtime *runtime)
270 {
271 snd_pcm_uframes_t avail;
272
273 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
274 avail = snd_pcm_playback_avail(runtime);
275 else
276 avail = snd_pcm_capture_avail(runtime);
277 if (avail > runtime->avail_max)
278 runtime->avail_max = avail;
279 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
280 if (avail >= runtime->buffer_size) {
281 snd_pcm_drain_done(substream);
282 return -EPIPE;
283 }
284 } else {
285 if (avail >= runtime->stop_threshold) {
286 xrun(substream);
287 return -EPIPE;
288 }
289 }
290 if (avail >= runtime->control->avail_min)
291 wake_up(runtime->twake ? &runtime->tsleep : &runtime->sleep);
292 return 0;
293 }
294
295 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
296 unsigned int in_interrupt)
297 {
298 struct snd_pcm_runtime *runtime = substream->runtime;
299 snd_pcm_uframes_t pos;
300 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
301 snd_pcm_sframes_t hdelta, delta;
302 unsigned long jdelta;
303
304 old_hw_ptr = runtime->status->hw_ptr;
305 pos = substream->ops->pointer(substream);
306 if (pos == SNDRV_PCM_POS_XRUN) {
307 xrun(substream);
308 return -EPIPE;
309 }
310 if (pos >= runtime->buffer_size) {
311 if (printk_ratelimit()) {
312 char name[16];
313 pcm_debug_name(substream, name, sizeof(name));
314 xrun_log_show(substream);
315 snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
316 "buffer size = %ld, period size = %ld\n",
317 name, pos, runtime->buffer_size,
318 runtime->period_size);
319 }
320 pos = 0;
321 }
322 pos -= pos % runtime->min_align;
323 if (xrun_debug(substream, XRUN_DEBUG_LOG))
324 xrun_log(substream, pos);
325 hw_base = runtime->hw_ptr_base;
326 new_hw_ptr = hw_base + pos;
327 if (in_interrupt) {
328 /* we know that one period was processed */
329 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
330 delta = runtime->hw_ptr_interrupt + runtime->period_size;
331 if (delta > new_hw_ptr) {
332 hw_base += runtime->buffer_size;
333 if (hw_base >= runtime->boundary)
334 hw_base = 0;
335 new_hw_ptr = hw_base + pos;
336 goto __delta;
337 }
338 }
339 /* new_hw_ptr might be lower than old_hw_ptr in case when */
340 /* pointer crosses the end of the ring buffer */
341 if (new_hw_ptr < old_hw_ptr) {
342 hw_base += runtime->buffer_size;
343 if (hw_base >= runtime->boundary)
344 hw_base = 0;
345 new_hw_ptr = hw_base + pos;
346 }
347 __delta:
348 delta = new_hw_ptr - old_hw_ptr;
349 if (delta < 0)
350 delta += runtime->boundary;
351 if (xrun_debug(substream, in_interrupt ?
352 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
353 char name[16];
354 pcm_debug_name(substream, name, sizeof(name));
355 snd_printd("%s_update: %s: pos=%u/%u/%u, "
356 "hwptr=%ld/%ld/%ld/%ld\n",
357 in_interrupt ? "period" : "hwptr",
358 name,
359 (unsigned int)pos,
360 (unsigned int)runtime->period_size,
361 (unsigned int)runtime->buffer_size,
362 (unsigned long)delta,
363 (unsigned long)old_hw_ptr,
364 (unsigned long)new_hw_ptr,
365 (unsigned long)runtime->hw_ptr_base);
366 }
367 /* something must be really wrong */
368 if (delta >= runtime->buffer_size + runtime->period_size) {
369 hw_ptr_error(substream,
370 "Unexpected hw_pointer value %s"
371 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
372 "old_hw_ptr=%ld)\n",
373 in_interrupt ? "[Q] " : "[P]",
374 substream->stream, (long)pos,
375 (long)new_hw_ptr, (long)old_hw_ptr);
376 return 0;
377 }
378
379 /* Do jiffies check only in xrun_debug mode */
380 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
381 goto no_jiffies_check;
382
383 /* Skip the jiffies check for hardwares with BATCH flag.
384 * Such hardware usually just increases the position at each IRQ,
385 * thus it can't give any strange position.
386 */
387 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
388 goto no_jiffies_check;
389 hdelta = delta;
390 if (hdelta < runtime->delay)
391 goto no_jiffies_check;
392 hdelta -= runtime->delay;
393 jdelta = jiffies - runtime->hw_ptr_jiffies;
394 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
395 delta = jdelta /
396 (((runtime->period_size * HZ) / runtime->rate)
397 + HZ/100);
398 /* move new_hw_ptr according jiffies not pos variable */
399 new_hw_ptr = old_hw_ptr;
400 hw_base = delta;
401 /* use loop to avoid checks for delta overflows */
402 /* the delta value is small or zero in most cases */
403 while (delta > 0) {
404 new_hw_ptr += runtime->period_size;
405 if (new_hw_ptr >= runtime->boundary)
406 new_hw_ptr -= runtime->boundary;
407 delta--;
408 }
409 /* align hw_base to buffer_size */
410 hw_ptr_error(substream,
411 "hw_ptr skipping! %s"
412 "(pos=%ld, delta=%ld, period=%ld, "
413 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
414 in_interrupt ? "[Q] " : "",
415 (long)pos, (long)hdelta,
416 (long)runtime->period_size, jdelta,
417 ((hdelta * HZ) / runtime->rate), hw_base,
418 (unsigned long)old_hw_ptr,
419 (unsigned long)new_hw_ptr);
420 /* reset values to proper state */
421 delta = 0;
422 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
423 }
424 no_jiffies_check:
425 if (delta > runtime->period_size + runtime->period_size / 2) {
426 hw_ptr_error(substream,
427 "Lost interrupts? %s"
428 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
429 "old_hw_ptr=%ld)\n",
430 in_interrupt ? "[Q] " : "",
431 substream->stream, (long)delta,
432 (long)new_hw_ptr,
433 (long)old_hw_ptr);
434 }
435
436 if (runtime->status->hw_ptr == new_hw_ptr)
437 return 0;
438
439 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
440 runtime->silence_size > 0)
441 snd_pcm_playback_silence(substream, new_hw_ptr);
442
443 if (in_interrupt) {
444 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
445 if (delta < 0)
446 delta += runtime->boundary;
447 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
448 runtime->hw_ptr_interrupt += delta;
449 if (runtime->hw_ptr_interrupt >= runtime->boundary)
450 runtime->hw_ptr_interrupt -= runtime->boundary;
451 }
452 runtime->hw_ptr_base = hw_base;
453 runtime->status->hw_ptr = new_hw_ptr;
454 runtime->hw_ptr_jiffies = jiffies;
455 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
456 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
457
458 return snd_pcm_update_state(substream, runtime);
459 }
460
461 /* CAUTION: call it with irq disabled */
462 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
463 {
464 return snd_pcm_update_hw_ptr0(substream, 0);
465 }
466
467 /**
468 * snd_pcm_set_ops - set the PCM operators
469 * @pcm: the pcm instance
470 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
471 * @ops: the operator table
472 *
473 * Sets the given PCM operators to the pcm instance.
474 */
475 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
476 {
477 struct snd_pcm_str *stream = &pcm->streams[direction];
478 struct snd_pcm_substream *substream;
479
480 for (substream = stream->substream; substream != NULL; substream = substream->next)
481 substream->ops = ops;
482 }
483
484 EXPORT_SYMBOL(snd_pcm_set_ops);
485
486 /**
487 * snd_pcm_sync - set the PCM sync id
488 * @substream: the pcm substream
489 *
490 * Sets the PCM sync identifier for the card.
491 */
492 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
493 {
494 struct snd_pcm_runtime *runtime = substream->runtime;
495
496 runtime->sync.id32[0] = substream->pcm->card->number;
497 runtime->sync.id32[1] = -1;
498 runtime->sync.id32[2] = -1;
499 runtime->sync.id32[3] = -1;
500 }
501
502 EXPORT_SYMBOL(snd_pcm_set_sync);
503
504 /*
505 * Standard ioctl routine
506 */
507
508 static inline unsigned int div32(unsigned int a, unsigned int b,
509 unsigned int *r)
510 {
511 if (b == 0) {
512 *r = 0;
513 return UINT_MAX;
514 }
515 *r = a % b;
516 return a / b;
517 }
518
519 static inline unsigned int div_down(unsigned int a, unsigned int b)
520 {
521 if (b == 0)
522 return UINT_MAX;
523 return a / b;
524 }
525
526 static inline unsigned int div_up(unsigned int a, unsigned int b)
527 {
528 unsigned int r;
529 unsigned int q;
530 if (b == 0)
531 return UINT_MAX;
532 q = div32(a, b, &r);
533 if (r)
534 ++q;
535 return q;
536 }
537
538 static inline unsigned int mul(unsigned int a, unsigned int b)
539 {
540 if (a == 0)
541 return 0;
542 if (div_down(UINT_MAX, a) < b)
543 return UINT_MAX;
544 return a * b;
545 }
546
547 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
548 unsigned int c, unsigned int *r)
549 {
550 u_int64_t n = (u_int64_t) a * b;
551 if (c == 0) {
552 snd_BUG_ON(!n);
553 *r = 0;
554 return UINT_MAX;
555 }
556 n = div_u64_rem(n, c, r);
557 if (n >= UINT_MAX) {
558 *r = 0;
559 return UINT_MAX;
560 }
561 return n;
562 }
563
564 /**
565 * snd_interval_refine - refine the interval value of configurator
566 * @i: the interval value to refine
567 * @v: the interval value to refer to
568 *
569 * Refines the interval value with the reference value.
570 * The interval is changed to the range satisfying both intervals.
571 * The interval status (min, max, integer, etc.) are evaluated.
572 *
573 * Returns non-zero if the value is changed, zero if not changed.
574 */
575 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
576 {
577 int changed = 0;
578 if (snd_BUG_ON(snd_interval_empty(i)))
579 return -EINVAL;
580 if (i->min < v->min) {
581 i->min = v->min;
582 i->openmin = v->openmin;
583 changed = 1;
584 } else if (i->min == v->min && !i->openmin && v->openmin) {
585 i->openmin = 1;
586 changed = 1;
587 }
588 if (i->max > v->max) {
589 i->max = v->max;
590 i->openmax = v->openmax;
591 changed = 1;
592 } else if (i->max == v->max && !i->openmax && v->openmax) {
593 i->openmax = 1;
594 changed = 1;
595 }
596 if (!i->integer && v->integer) {
597 i->integer = 1;
598 changed = 1;
599 }
600 if (i->integer) {
601 if (i->openmin) {
602 i->min++;
603 i->openmin = 0;
604 }
605 if (i->openmax) {
606 i->max--;
607 i->openmax = 0;
608 }
609 } else if (!i->openmin && !i->openmax && i->min == i->max)
610 i->integer = 1;
611 if (snd_interval_checkempty(i)) {
612 snd_interval_none(i);
613 return -EINVAL;
614 }
615 return changed;
616 }
617
618 EXPORT_SYMBOL(snd_interval_refine);
619
620 static int snd_interval_refine_first(struct snd_interval *i)
621 {
622 if (snd_BUG_ON(snd_interval_empty(i)))
623 return -EINVAL;
624 if (snd_interval_single(i))
625 return 0;
626 i->max = i->min;
627 i->openmax = i->openmin;
628 if (i->openmax)
629 i->max++;
630 return 1;
631 }
632
633 static int snd_interval_refine_last(struct snd_interval *i)
634 {
635 if (snd_BUG_ON(snd_interval_empty(i)))
636 return -EINVAL;
637 if (snd_interval_single(i))
638 return 0;
639 i->min = i->max;
640 i->openmin = i->openmax;
641 if (i->openmin)
642 i->min--;
643 return 1;
644 }
645
646 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
647 {
648 if (a->empty || b->empty) {
649 snd_interval_none(c);
650 return;
651 }
652 c->empty = 0;
653 c->min = mul(a->min, b->min);
654 c->openmin = (a->openmin || b->openmin);
655 c->max = mul(a->max, b->max);
656 c->openmax = (a->openmax || b->openmax);
657 c->integer = (a->integer && b->integer);
658 }
659
660 /**
661 * snd_interval_div - refine the interval value with division
662 * @a: dividend
663 * @b: divisor
664 * @c: quotient
665 *
666 * c = a / b
667 *
668 * Returns non-zero if the value is changed, zero if not changed.
669 */
670 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
671 {
672 unsigned int r;
673 if (a->empty || b->empty) {
674 snd_interval_none(c);
675 return;
676 }
677 c->empty = 0;
678 c->min = div32(a->min, b->max, &r);
679 c->openmin = (r || a->openmin || b->openmax);
680 if (b->min > 0) {
681 c->max = div32(a->max, b->min, &r);
682 if (r) {
683 c->max++;
684 c->openmax = 1;
685 } else
686 c->openmax = (a->openmax || b->openmin);
687 } else {
688 c->max = UINT_MAX;
689 c->openmax = 0;
690 }
691 c->integer = 0;
692 }
693
694 /**
695 * snd_interval_muldivk - refine the interval value
696 * @a: dividend 1
697 * @b: dividend 2
698 * @k: divisor (as integer)
699 * @c: result
700 *
701 * c = a * b / k
702 *
703 * Returns non-zero if the value is changed, zero if not changed.
704 */
705 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
706 unsigned int k, struct snd_interval *c)
707 {
708 unsigned int r;
709 if (a->empty || b->empty) {
710 snd_interval_none(c);
711 return;
712 }
713 c->empty = 0;
714 c->min = muldiv32(a->min, b->min, k, &r);
715 c->openmin = (r || a->openmin || b->openmin);
716 c->max = muldiv32(a->max, b->max, k, &r);
717 if (r) {
718 c->max++;
719 c->openmax = 1;
720 } else
721 c->openmax = (a->openmax || b->openmax);
722 c->integer = 0;
723 }
724
725 /**
726 * snd_interval_mulkdiv - refine the interval value
727 * @a: dividend 1
728 * @k: dividend 2 (as integer)
729 * @b: divisor
730 * @c: result
731 *
732 * c = a * k / b
733 *
734 * Returns non-zero if the value is changed, zero if not changed.
735 */
736 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
737 const struct snd_interval *b, struct snd_interval *c)
738 {
739 unsigned int r;
740 if (a->empty || b->empty) {
741 snd_interval_none(c);
742 return;
743 }
744 c->empty = 0;
745 c->min = muldiv32(a->min, k, b->max, &r);
746 c->openmin = (r || a->openmin || b->openmax);
747 if (b->min > 0) {
748 c->max = muldiv32(a->max, k, b->min, &r);
749 if (r) {
750 c->max++;
751 c->openmax = 1;
752 } else
753 c->openmax = (a->openmax || b->openmin);
754 } else {
755 c->max = UINT_MAX;
756 c->openmax = 0;
757 }
758 c->integer = 0;
759 }
760
761 /* ---- */
762
763
764 /**
765 * snd_interval_ratnum - refine the interval value
766 * @i: interval to refine
767 * @rats_count: number of ratnum_t
768 * @rats: ratnum_t array
769 * @nump: pointer to store the resultant numerator
770 * @denp: pointer to store the resultant denominator
771 *
772 * Returns non-zero if the value is changed, zero if not changed.
773 */
774 int snd_interval_ratnum(struct snd_interval *i,
775 unsigned int rats_count, struct snd_ratnum *rats,
776 unsigned int *nump, unsigned int *denp)
777 {
778 unsigned int best_num, best_den;
779 int best_diff;
780 unsigned int k;
781 struct snd_interval t;
782 int err;
783 unsigned int result_num, result_den;
784 int result_diff;
785
786 best_num = best_den = best_diff = 0;
787 for (k = 0; k < rats_count; ++k) {
788 unsigned int num = rats[k].num;
789 unsigned int den;
790 unsigned int q = i->min;
791 int diff;
792 if (q == 0)
793 q = 1;
794 den = div_up(num, q);
795 if (den < rats[k].den_min)
796 continue;
797 if (den > rats[k].den_max)
798 den = rats[k].den_max;
799 else {
800 unsigned int r;
801 r = (den - rats[k].den_min) % rats[k].den_step;
802 if (r != 0)
803 den -= r;
804 }
805 diff = num - q * den;
806 if (diff < 0)
807 diff = -diff;
808 if (best_num == 0 ||
809 diff * best_den < best_diff * den) {
810 best_diff = diff;
811 best_den = den;
812 best_num = num;
813 }
814 }
815 if (best_den == 0) {
816 i->empty = 1;
817 return -EINVAL;
818 }
819 t.min = div_down(best_num, best_den);
820 t.openmin = !!(best_num % best_den);
821
822 result_num = best_num;
823 result_diff = best_diff;
824 result_den = best_den;
825 best_num = best_den = best_diff = 0;
826 for (k = 0; k < rats_count; ++k) {
827 unsigned int num = rats[k].num;
828 unsigned int den;
829 unsigned int q = i->max;
830 int diff;
831 if (q == 0) {
832 i->empty = 1;
833 return -EINVAL;
834 }
835 den = div_down(num, q);
836 if (den > rats[k].den_max)
837 continue;
838 if (den < rats[k].den_min)
839 den = rats[k].den_min;
840 else {
841 unsigned int r;
842 r = (den - rats[k].den_min) % rats[k].den_step;
843 if (r != 0)
844 den += rats[k].den_step - r;
845 }
846 diff = q * den - num;
847 if (diff < 0)
848 diff = -diff;
849 if (best_num == 0 ||
850 diff * best_den < best_diff * den) {
851 best_diff = diff;
852 best_den = den;
853 best_num = num;
854 }
855 }
856 if (best_den == 0) {
857 i->empty = 1;
858 return -EINVAL;
859 }
860 t.max = div_up(best_num, best_den);
861 t.openmax = !!(best_num % best_den);
862 t.integer = 0;
863 err = snd_interval_refine(i, &t);
864 if (err < 0)
865 return err;
866
867 if (snd_interval_single(i)) {
868 if (best_diff * result_den < result_diff * best_den) {
869 result_num = best_num;
870 result_den = best_den;
871 }
872 if (nump)
873 *nump = result_num;
874 if (denp)
875 *denp = result_den;
876 }
877 return err;
878 }
879
880 EXPORT_SYMBOL(snd_interval_ratnum);
881
882 /**
883 * snd_interval_ratden - refine the interval value
884 * @i: interval to refine
885 * @rats_count: number of struct ratden
886 * @rats: struct ratden array
887 * @nump: pointer to store the resultant numerator
888 * @denp: pointer to store the resultant denominator
889 *
890 * Returns non-zero if the value is changed, zero if not changed.
891 */
892 static int snd_interval_ratden(struct snd_interval *i,
893 unsigned int rats_count, struct snd_ratden *rats,
894 unsigned int *nump, unsigned int *denp)
895 {
896 unsigned int best_num, best_diff, best_den;
897 unsigned int k;
898 struct snd_interval t;
899 int err;
900
901 best_num = best_den = best_diff = 0;
902 for (k = 0; k < rats_count; ++k) {
903 unsigned int num;
904 unsigned int den = rats[k].den;
905 unsigned int q = i->min;
906 int diff;
907 num = mul(q, den);
908 if (num > rats[k].num_max)
909 continue;
910 if (num < rats[k].num_min)
911 num = rats[k].num_max;
912 else {
913 unsigned int r;
914 r = (num - rats[k].num_min) % rats[k].num_step;
915 if (r != 0)
916 num += rats[k].num_step - r;
917 }
918 diff = num - q * den;
919 if (best_num == 0 ||
920 diff * best_den < best_diff * den) {
921 best_diff = diff;
922 best_den = den;
923 best_num = num;
924 }
925 }
926 if (best_den == 0) {
927 i->empty = 1;
928 return -EINVAL;
929 }
930 t.min = div_down(best_num, best_den);
931 t.openmin = !!(best_num % best_den);
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->max;
938 int diff;
939 num = mul(q, den);
940 if (num < rats[k].num_min)
941 continue;
942 if (num > rats[k].num_max)
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 -= r;
949 }
950 diff = q * den - num;
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.max = div_up(best_num, best_den);
963 t.openmax = !!(best_num % best_den);
964 t.integer = 0;
965 err = snd_interval_refine(i, &t);
966 if (err < 0)
967 return err;
968
969 if (snd_interval_single(i)) {
970 if (nump)
971 *nump = best_num;
972 if (denp)
973 *denp = best_den;
974 }
975 return err;
976 }
977
978 /**
979 * snd_interval_list - refine the interval value from the list
980 * @i: the interval value to refine
981 * @count: the number of elements in the list
982 * @list: the value list
983 * @mask: the bit-mask to evaluate
984 *
985 * Refines the interval value from the list.
986 * When mask is non-zero, only the elements corresponding to bit 1 are
987 * evaluated.
988 *
989 * Returns non-zero if the value is changed, zero if not changed.
990 */
991 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
992 {
993 unsigned int k;
994 struct snd_interval list_range;
995
996 if (!count) {
997 i->empty = 1;
998 return -EINVAL;
999 }
1000 snd_interval_any(&list_range);
1001 list_range.min = UINT_MAX;
1002 list_range.max = 0;
1003 for (k = 0; k < count; k++) {
1004 if (mask && !(mask & (1 << k)))
1005 continue;
1006 if (!snd_interval_test(i, list[k]))
1007 continue;
1008 list_range.min = min(list_range.min, list[k]);
1009 list_range.max = max(list_range.max, list[k]);
1010 }
1011 return snd_interval_refine(i, &list_range);
1012 }
1013
1014 EXPORT_SYMBOL(snd_interval_list);
1015
1016 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1017 {
1018 unsigned int n;
1019 int changed = 0;
1020 n = (i->min - min) % step;
1021 if (n != 0 || i->openmin) {
1022 i->min += step - n;
1023 changed = 1;
1024 }
1025 n = (i->max - min) % step;
1026 if (n != 0 || i->openmax) {
1027 i->max -= n;
1028 changed = 1;
1029 }
1030 if (snd_interval_checkempty(i)) {
1031 i->empty = 1;
1032 return -EINVAL;
1033 }
1034 return changed;
1035 }
1036
1037 /* Info constraints helpers */
1038
1039 /**
1040 * snd_pcm_hw_rule_add - add the hw-constraint rule
1041 * @runtime: the pcm runtime instance
1042 * @cond: condition bits
1043 * @var: the variable to evaluate
1044 * @func: the evaluation function
1045 * @private: the private data pointer passed to function
1046 * @dep: the dependent variables
1047 *
1048 * Returns zero if successful, or a negative error code on failure.
1049 */
1050 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1051 int var,
1052 snd_pcm_hw_rule_func_t func, void *private,
1053 int dep, ...)
1054 {
1055 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1056 struct snd_pcm_hw_rule *c;
1057 unsigned int k;
1058 va_list args;
1059 va_start(args, dep);
1060 if (constrs->rules_num >= constrs->rules_all) {
1061 struct snd_pcm_hw_rule *new;
1062 unsigned int new_rules = constrs->rules_all + 16;
1063 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1064 if (!new)
1065 return -ENOMEM;
1066 if (constrs->rules) {
1067 memcpy(new, constrs->rules,
1068 constrs->rules_num * sizeof(*c));
1069 kfree(constrs->rules);
1070 }
1071 constrs->rules = new;
1072 constrs->rules_all = new_rules;
1073 }
1074 c = &constrs->rules[constrs->rules_num];
1075 c->cond = cond;
1076 c->func = func;
1077 c->var = var;
1078 c->private = private;
1079 k = 0;
1080 while (1) {
1081 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
1082 return -EINVAL;
1083 c->deps[k++] = dep;
1084 if (dep < 0)
1085 break;
1086 dep = va_arg(args, int);
1087 }
1088 constrs->rules_num++;
1089 va_end(args);
1090 return 0;
1091 }
1092
1093 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1094
1095 /**
1096 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1097 * @runtime: PCM runtime instance
1098 * @var: hw_params variable to apply the mask
1099 * @mask: the bitmap mask
1100 *
1101 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1102 */
1103 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1104 u_int32_t mask)
1105 {
1106 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1107 struct snd_mask *maskp = constrs_mask(constrs, var);
1108 *maskp->bits &= mask;
1109 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1110 if (*maskp->bits == 0)
1111 return -EINVAL;
1112 return 0;
1113 }
1114
1115 /**
1116 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1117 * @runtime: PCM runtime instance
1118 * @var: hw_params variable to apply the mask
1119 * @mask: the 64bit bitmap mask
1120 *
1121 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1122 */
1123 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1124 u_int64_t mask)
1125 {
1126 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1127 struct snd_mask *maskp = constrs_mask(constrs, var);
1128 maskp->bits[0] &= (u_int32_t)mask;
1129 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1130 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1131 if (! maskp->bits[0] && ! maskp->bits[1])
1132 return -EINVAL;
1133 return 0;
1134 }
1135
1136 /**
1137 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1138 * @runtime: PCM runtime instance
1139 * @var: hw_params variable to apply the integer constraint
1140 *
1141 * Apply the constraint of integer to an interval parameter.
1142 */
1143 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1144 {
1145 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1146 return snd_interval_setinteger(constrs_interval(constrs, var));
1147 }
1148
1149 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1150
1151 /**
1152 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1153 * @runtime: PCM runtime instance
1154 * @var: hw_params variable to apply the range
1155 * @min: the minimal value
1156 * @max: the maximal value
1157 *
1158 * Apply the min/max range constraint to an interval parameter.
1159 */
1160 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1161 unsigned int min, unsigned int max)
1162 {
1163 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1164 struct snd_interval t;
1165 t.min = min;
1166 t.max = max;
1167 t.openmin = t.openmax = 0;
1168 t.integer = 0;
1169 return snd_interval_refine(constrs_interval(constrs, var), &t);
1170 }
1171
1172 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1173
1174 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1175 struct snd_pcm_hw_rule *rule)
1176 {
1177 struct snd_pcm_hw_constraint_list *list = rule->private;
1178 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1179 }
1180
1181
1182 /**
1183 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1184 * @runtime: PCM runtime instance
1185 * @cond: condition bits
1186 * @var: hw_params variable to apply the list constraint
1187 * @l: list
1188 *
1189 * Apply the list of constraints to an interval parameter.
1190 */
1191 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1192 unsigned int cond,
1193 snd_pcm_hw_param_t var,
1194 struct snd_pcm_hw_constraint_list *l)
1195 {
1196 return snd_pcm_hw_rule_add(runtime, cond, var,
1197 snd_pcm_hw_rule_list, l,
1198 var, -1);
1199 }
1200
1201 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1202
1203 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1204 struct snd_pcm_hw_rule *rule)
1205 {
1206 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1207 unsigned int num = 0, den = 0;
1208 int err;
1209 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1210 r->nrats, r->rats, &num, &den);
1211 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1212 params->rate_num = num;
1213 params->rate_den = den;
1214 }
1215 return err;
1216 }
1217
1218 /**
1219 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1220 * @runtime: PCM runtime instance
1221 * @cond: condition bits
1222 * @var: hw_params variable to apply the ratnums constraint
1223 * @r: struct snd_ratnums constriants
1224 */
1225 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1226 unsigned int cond,
1227 snd_pcm_hw_param_t var,
1228 struct snd_pcm_hw_constraint_ratnums *r)
1229 {
1230 return snd_pcm_hw_rule_add(runtime, cond, var,
1231 snd_pcm_hw_rule_ratnums, r,
1232 var, -1);
1233 }
1234
1235 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1236
1237 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1238 struct snd_pcm_hw_rule *rule)
1239 {
1240 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1241 unsigned int num = 0, den = 0;
1242 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1243 r->nrats, r->rats, &num, &den);
1244 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1245 params->rate_num = num;
1246 params->rate_den = den;
1247 }
1248 return err;
1249 }
1250
1251 /**
1252 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1253 * @runtime: PCM runtime instance
1254 * @cond: condition bits
1255 * @var: hw_params variable to apply the ratdens constraint
1256 * @r: struct snd_ratdens constriants
1257 */
1258 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1259 unsigned int cond,
1260 snd_pcm_hw_param_t var,
1261 struct snd_pcm_hw_constraint_ratdens *r)
1262 {
1263 return snd_pcm_hw_rule_add(runtime, cond, var,
1264 snd_pcm_hw_rule_ratdens, r,
1265 var, -1);
1266 }
1267
1268 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1269
1270 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1271 struct snd_pcm_hw_rule *rule)
1272 {
1273 unsigned int l = (unsigned long) rule->private;
1274 int width = l & 0xffff;
1275 unsigned int msbits = l >> 16;
1276 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1277 if (snd_interval_single(i) && snd_interval_value(i) == width)
1278 params->msbits = msbits;
1279 return 0;
1280 }
1281
1282 /**
1283 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1284 * @runtime: PCM runtime instance
1285 * @cond: condition bits
1286 * @width: sample bits width
1287 * @msbits: msbits width
1288 */
1289 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1290 unsigned int cond,
1291 unsigned int width,
1292 unsigned int msbits)
1293 {
1294 unsigned long l = (msbits << 16) | width;
1295 return snd_pcm_hw_rule_add(runtime, cond, -1,
1296 snd_pcm_hw_rule_msbits,
1297 (void*) l,
1298 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1299 }
1300
1301 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1302
1303 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1304 struct snd_pcm_hw_rule *rule)
1305 {
1306 unsigned long step = (unsigned long) rule->private;
1307 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1308 }
1309
1310 /**
1311 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1312 * @runtime: PCM runtime instance
1313 * @cond: condition bits
1314 * @var: hw_params variable to apply the step constraint
1315 * @step: step size
1316 */
1317 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1318 unsigned int cond,
1319 snd_pcm_hw_param_t var,
1320 unsigned long step)
1321 {
1322 return snd_pcm_hw_rule_add(runtime, cond, var,
1323 snd_pcm_hw_rule_step, (void *) step,
1324 var, -1);
1325 }
1326
1327 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1328
1329 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1330 {
1331 static unsigned int pow2_sizes[] = {
1332 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1333 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1334 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1335 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1336 };
1337 return snd_interval_list(hw_param_interval(params, rule->var),
1338 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1339 }
1340
1341 /**
1342 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1343 * @runtime: PCM runtime instance
1344 * @cond: condition bits
1345 * @var: hw_params variable to apply the power-of-2 constraint
1346 */
1347 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1348 unsigned int cond,
1349 snd_pcm_hw_param_t var)
1350 {
1351 return snd_pcm_hw_rule_add(runtime, cond, var,
1352 snd_pcm_hw_rule_pow2, NULL,
1353 var, -1);
1354 }
1355
1356 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1357
1358 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1359 snd_pcm_hw_param_t var)
1360 {
1361 if (hw_is_mask(var)) {
1362 snd_mask_any(hw_param_mask(params, var));
1363 params->cmask |= 1 << var;
1364 params->rmask |= 1 << var;
1365 return;
1366 }
1367 if (hw_is_interval(var)) {
1368 snd_interval_any(hw_param_interval(params, var));
1369 params->cmask |= 1 << var;
1370 params->rmask |= 1 << var;
1371 return;
1372 }
1373 snd_BUG();
1374 }
1375
1376 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1377 {
1378 unsigned int k;
1379 memset(params, 0, sizeof(*params));
1380 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1381 _snd_pcm_hw_param_any(params, k);
1382 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1383 _snd_pcm_hw_param_any(params, k);
1384 params->info = ~0U;
1385 }
1386
1387 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1388
1389 /**
1390 * snd_pcm_hw_param_value - return @params field @var value
1391 * @params: the hw_params instance
1392 * @var: parameter to retrieve
1393 * @dir: pointer to the direction (-1,0,1) or %NULL
1394 *
1395 * Return the value for field @var if it's fixed in configuration space
1396 * defined by @params. Return -%EINVAL otherwise.
1397 */
1398 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1399 snd_pcm_hw_param_t var, int *dir)
1400 {
1401 if (hw_is_mask(var)) {
1402 const struct snd_mask *mask = hw_param_mask_c(params, var);
1403 if (!snd_mask_single(mask))
1404 return -EINVAL;
1405 if (dir)
1406 *dir = 0;
1407 return snd_mask_value(mask);
1408 }
1409 if (hw_is_interval(var)) {
1410 const struct snd_interval *i = hw_param_interval_c(params, var);
1411 if (!snd_interval_single(i))
1412 return -EINVAL;
1413 if (dir)
1414 *dir = i->openmin;
1415 return snd_interval_value(i);
1416 }
1417 return -EINVAL;
1418 }
1419
1420 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1421
1422 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1423 snd_pcm_hw_param_t var)
1424 {
1425 if (hw_is_mask(var)) {
1426 snd_mask_none(hw_param_mask(params, var));
1427 params->cmask |= 1 << var;
1428 params->rmask |= 1 << var;
1429 } else if (hw_is_interval(var)) {
1430 snd_interval_none(hw_param_interval(params, var));
1431 params->cmask |= 1 << var;
1432 params->rmask |= 1 << var;
1433 } else {
1434 snd_BUG();
1435 }
1436 }
1437
1438 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1439
1440 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1441 snd_pcm_hw_param_t var)
1442 {
1443 int changed;
1444 if (hw_is_mask(var))
1445 changed = snd_mask_refine_first(hw_param_mask(params, var));
1446 else if (hw_is_interval(var))
1447 changed = snd_interval_refine_first(hw_param_interval(params, var));
1448 else
1449 return -EINVAL;
1450 if (changed) {
1451 params->cmask |= 1 << var;
1452 params->rmask |= 1 << var;
1453 }
1454 return changed;
1455 }
1456
1457
1458 /**
1459 * snd_pcm_hw_param_first - refine config space and return minimum value
1460 * @pcm: PCM instance
1461 * @params: the hw_params instance
1462 * @var: parameter to retrieve
1463 * @dir: pointer to the direction (-1,0,1) or %NULL
1464 *
1465 * Inside configuration space defined by @params remove from @var all
1466 * values > minimum. Reduce configuration space accordingly.
1467 * Return the minimum.
1468 */
1469 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1470 struct snd_pcm_hw_params *params,
1471 snd_pcm_hw_param_t var, int *dir)
1472 {
1473 int changed = _snd_pcm_hw_param_first(params, var);
1474 if (changed < 0)
1475 return changed;
1476 if (params->rmask) {
1477 int err = snd_pcm_hw_refine(pcm, params);
1478 if (snd_BUG_ON(err < 0))
1479 return err;
1480 }
1481 return snd_pcm_hw_param_value(params, var, dir);
1482 }
1483
1484 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1485
1486 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1487 snd_pcm_hw_param_t var)
1488 {
1489 int changed;
1490 if (hw_is_mask(var))
1491 changed = snd_mask_refine_last(hw_param_mask(params, var));
1492 else if (hw_is_interval(var))
1493 changed = snd_interval_refine_last(hw_param_interval(params, var));
1494 else
1495 return -EINVAL;
1496 if (changed) {
1497 params->cmask |= 1 << var;
1498 params->rmask |= 1 << var;
1499 }
1500 return changed;
1501 }
1502
1503
1504 /**
1505 * snd_pcm_hw_param_last - refine config space and return maximum value
1506 * @pcm: PCM instance
1507 * @params: the hw_params instance
1508 * @var: parameter to retrieve
1509 * @dir: pointer to the direction (-1,0,1) or %NULL
1510 *
1511 * Inside configuration space defined by @params remove from @var all
1512 * values < maximum. Reduce configuration space accordingly.
1513 * Return the maximum.
1514 */
1515 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1516 struct snd_pcm_hw_params *params,
1517 snd_pcm_hw_param_t var, int *dir)
1518 {
1519 int changed = _snd_pcm_hw_param_last(params, var);
1520 if (changed < 0)
1521 return changed;
1522 if (params->rmask) {
1523 int err = snd_pcm_hw_refine(pcm, params);
1524 if (snd_BUG_ON(err < 0))
1525 return err;
1526 }
1527 return snd_pcm_hw_param_value(params, var, dir);
1528 }
1529
1530 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1531
1532 /**
1533 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1534 * @pcm: PCM instance
1535 * @params: the hw_params instance
1536 *
1537 * Choose one configuration from configuration space defined by @params.
1538 * The configuration chosen is that obtained fixing in this order:
1539 * first access, first format, first subformat, min channels,
1540 * min rate, min period time, max buffer size, min tick time
1541 */
1542 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1543 struct snd_pcm_hw_params *params)
1544 {
1545 static int vars[] = {
1546 SNDRV_PCM_HW_PARAM_ACCESS,
1547 SNDRV_PCM_HW_PARAM_FORMAT,
1548 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1549 SNDRV_PCM_HW_PARAM_CHANNELS,
1550 SNDRV_PCM_HW_PARAM_RATE,
1551 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1552 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1553 SNDRV_PCM_HW_PARAM_TICK_TIME,
1554 -1
1555 };
1556 int err, *v;
1557
1558 for (v = vars; *v != -1; v++) {
1559 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1560 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1561 else
1562 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1563 if (snd_BUG_ON(err < 0))
1564 return err;
1565 }
1566 return 0;
1567 }
1568
1569 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1570 void *arg)
1571 {
1572 struct snd_pcm_runtime *runtime = substream->runtime;
1573 unsigned long flags;
1574 snd_pcm_stream_lock_irqsave(substream, flags);
1575 if (snd_pcm_running(substream) &&
1576 snd_pcm_update_hw_ptr(substream) >= 0)
1577 runtime->status->hw_ptr %= runtime->buffer_size;
1578 else
1579 runtime->status->hw_ptr = 0;
1580 snd_pcm_stream_unlock_irqrestore(substream, flags);
1581 return 0;
1582 }
1583
1584 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1585 void *arg)
1586 {
1587 struct snd_pcm_channel_info *info = arg;
1588 struct snd_pcm_runtime *runtime = substream->runtime;
1589 int width;
1590 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1591 info->offset = -1;
1592 return 0;
1593 }
1594 width = snd_pcm_format_physical_width(runtime->format);
1595 if (width < 0)
1596 return width;
1597 info->offset = 0;
1598 switch (runtime->access) {
1599 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1600 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1601 info->first = info->channel * width;
1602 info->step = runtime->channels * width;
1603 break;
1604 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1605 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1606 {
1607 size_t size = runtime->dma_bytes / runtime->channels;
1608 info->first = info->channel * size * 8;
1609 info->step = width;
1610 break;
1611 }
1612 default:
1613 snd_BUG();
1614 break;
1615 }
1616 return 0;
1617 }
1618
1619 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1620 void *arg)
1621 {
1622 struct snd_pcm_hw_params *params = arg;
1623 snd_pcm_format_t format;
1624 int channels, width;
1625
1626 params->fifo_size = substream->runtime->hw.fifo_size;
1627 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1628 format = params_format(params);
1629 channels = params_channels(params);
1630 width = snd_pcm_format_physical_width(format);
1631 params->fifo_size /= width * channels;
1632 }
1633 return 0;
1634 }
1635
1636 /**
1637 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1638 * @substream: the pcm substream instance
1639 * @cmd: ioctl command
1640 * @arg: ioctl argument
1641 *
1642 * Processes the generic ioctl commands for PCM.
1643 * Can be passed as the ioctl callback for PCM ops.
1644 *
1645 * Returns zero if successful, or a negative error code on failure.
1646 */
1647 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1648 unsigned int cmd, void *arg)
1649 {
1650 switch (cmd) {
1651 case SNDRV_PCM_IOCTL1_INFO:
1652 return 0;
1653 case SNDRV_PCM_IOCTL1_RESET:
1654 return snd_pcm_lib_ioctl_reset(substream, arg);
1655 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1656 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1657 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1658 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1659 }
1660 return -ENXIO;
1661 }
1662
1663 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1664
1665 /**
1666 * snd_pcm_period_elapsed - update the pcm status for the next period
1667 * @substream: the pcm substream instance
1668 *
1669 * This function is called from the interrupt handler when the
1670 * PCM has processed the period size. It will update the current
1671 * pointer, wake up sleepers, etc.
1672 *
1673 * Even if more than one periods have elapsed since the last call, you
1674 * have to call this only once.
1675 */
1676 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1677 {
1678 struct snd_pcm_runtime *runtime;
1679 unsigned long flags;
1680
1681 if (PCM_RUNTIME_CHECK(substream))
1682 return;
1683 runtime = substream->runtime;
1684
1685 if (runtime->transfer_ack_begin)
1686 runtime->transfer_ack_begin(substream);
1687
1688 snd_pcm_stream_lock_irqsave(substream, flags);
1689 if (!snd_pcm_running(substream) ||
1690 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1691 goto _end;
1692
1693 if (substream->timer_running)
1694 snd_timer_interrupt(substream->timer, 1);
1695 _end:
1696 snd_pcm_stream_unlock_irqrestore(substream, flags);
1697 if (runtime->transfer_ack_end)
1698 runtime->transfer_ack_end(substream);
1699 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1700 }
1701
1702 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1703
1704 /*
1705 * Wait until avail_min data becomes available
1706 * Returns a negative error code if any error occurs during operation.
1707 * The available space is stored on availp. When err = 0 and avail = 0
1708 * on the capture stream, it indicates the stream is in DRAINING state.
1709 */
1710 static int wait_for_avail_min(struct snd_pcm_substream *substream,
1711 snd_pcm_uframes_t *availp)
1712 {
1713 struct snd_pcm_runtime *runtime = substream->runtime;
1714 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1715 wait_queue_t wait;
1716 int err = 0;
1717 snd_pcm_uframes_t avail = 0;
1718 long tout;
1719
1720 init_waitqueue_entry(&wait, current);
1721 add_wait_queue(&runtime->tsleep, &wait);
1722 for (;;) {
1723 if (signal_pending(current)) {
1724 err = -ERESTARTSYS;
1725 break;
1726 }
1727 set_current_state(TASK_INTERRUPTIBLE);
1728 snd_pcm_stream_unlock_irq(substream);
1729 tout = schedule_timeout(msecs_to_jiffies(10000));
1730 snd_pcm_stream_lock_irq(substream);
1731 switch (runtime->status->state) {
1732 case SNDRV_PCM_STATE_SUSPENDED:
1733 err = -ESTRPIPE;
1734 goto _endloop;
1735 case SNDRV_PCM_STATE_XRUN:
1736 err = -EPIPE;
1737 goto _endloop;
1738 case SNDRV_PCM_STATE_DRAINING:
1739 if (is_playback)
1740 err = -EPIPE;
1741 else
1742 avail = 0; /* indicate draining */
1743 goto _endloop;
1744 case SNDRV_PCM_STATE_OPEN:
1745 case SNDRV_PCM_STATE_SETUP:
1746 case SNDRV_PCM_STATE_DISCONNECTED:
1747 err = -EBADFD;
1748 goto _endloop;
1749 }
1750 if (!tout) {
1751 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1752 is_playback ? "playback" : "capture");
1753 err = -EIO;
1754 break;
1755 }
1756 if (is_playback)
1757 avail = snd_pcm_playback_avail(runtime);
1758 else
1759 avail = snd_pcm_capture_avail(runtime);
1760 if (avail >= runtime->control->avail_min)
1761 break;
1762 }
1763 _endloop:
1764 remove_wait_queue(&runtime->tsleep, &wait);
1765 *availp = avail;
1766 return err;
1767 }
1768
1769 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1770 unsigned int hwoff,
1771 unsigned long data, unsigned int off,
1772 snd_pcm_uframes_t frames)
1773 {
1774 struct snd_pcm_runtime *runtime = substream->runtime;
1775 int err;
1776 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1777 if (substream->ops->copy) {
1778 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1779 return err;
1780 } else {
1781 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1782 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1783 return -EFAULT;
1784 }
1785 return 0;
1786 }
1787
1788 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1789 unsigned long data, unsigned int off,
1790 snd_pcm_uframes_t size);
1791
1792 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1793 unsigned long data,
1794 snd_pcm_uframes_t size,
1795 int nonblock,
1796 transfer_f transfer)
1797 {
1798 struct snd_pcm_runtime *runtime = substream->runtime;
1799 snd_pcm_uframes_t xfer = 0;
1800 snd_pcm_uframes_t offset = 0;
1801 int err = 0;
1802
1803 if (size == 0)
1804 return 0;
1805
1806 snd_pcm_stream_lock_irq(substream);
1807 switch (runtime->status->state) {
1808 case SNDRV_PCM_STATE_PREPARED:
1809 case SNDRV_PCM_STATE_RUNNING:
1810 case SNDRV_PCM_STATE_PAUSED:
1811 break;
1812 case SNDRV_PCM_STATE_XRUN:
1813 err = -EPIPE;
1814 goto _end_unlock;
1815 case SNDRV_PCM_STATE_SUSPENDED:
1816 err = -ESTRPIPE;
1817 goto _end_unlock;
1818 default:
1819 err = -EBADFD;
1820 goto _end_unlock;
1821 }
1822
1823 runtime->twake = 1;
1824 while (size > 0) {
1825 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1826 snd_pcm_uframes_t avail;
1827 snd_pcm_uframes_t cont;
1828 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1829 snd_pcm_update_hw_ptr(substream);
1830 avail = snd_pcm_playback_avail(runtime);
1831 if (!avail) {
1832 if (nonblock) {
1833 err = -EAGAIN;
1834 goto _end_unlock;
1835 }
1836 err = wait_for_avail_min(substream, &avail);
1837 if (err < 0)
1838 goto _end_unlock;
1839 }
1840 frames = size > avail ? avail : size;
1841 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1842 if (frames > cont)
1843 frames = cont;
1844 if (snd_BUG_ON(!frames)) {
1845 runtime->twake = 0;
1846 snd_pcm_stream_unlock_irq(substream);
1847 return -EINVAL;
1848 }
1849 appl_ptr = runtime->control->appl_ptr;
1850 appl_ofs = appl_ptr % runtime->buffer_size;
1851 snd_pcm_stream_unlock_irq(substream);
1852 err = transfer(substream, appl_ofs, data, offset, frames);
1853 snd_pcm_stream_lock_irq(substream);
1854 if (err < 0)
1855 goto _end_unlock;
1856 switch (runtime->status->state) {
1857 case SNDRV_PCM_STATE_XRUN:
1858 err = -EPIPE;
1859 goto _end_unlock;
1860 case SNDRV_PCM_STATE_SUSPENDED:
1861 err = -ESTRPIPE;
1862 goto _end_unlock;
1863 default:
1864 break;
1865 }
1866 appl_ptr += frames;
1867 if (appl_ptr >= runtime->boundary)
1868 appl_ptr -= runtime->boundary;
1869 runtime->control->appl_ptr = appl_ptr;
1870 if (substream->ops->ack)
1871 substream->ops->ack(substream);
1872
1873 offset += frames;
1874 size -= frames;
1875 xfer += frames;
1876 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1877 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1878 err = snd_pcm_start(substream);
1879 if (err < 0)
1880 goto _end_unlock;
1881 }
1882 }
1883 _end_unlock:
1884 runtime->twake = 0;
1885 if (xfer > 0 && err >= 0)
1886 snd_pcm_update_state(substream, runtime);
1887 snd_pcm_stream_unlock_irq(substream);
1888 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1889 }
1890
1891 /* sanity-check for read/write methods */
1892 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1893 {
1894 struct snd_pcm_runtime *runtime;
1895 if (PCM_RUNTIME_CHECK(substream))
1896 return -ENXIO;
1897 runtime = substream->runtime;
1898 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1899 return -EINVAL;
1900 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1901 return -EBADFD;
1902 return 0;
1903 }
1904
1905 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1906 {
1907 struct snd_pcm_runtime *runtime;
1908 int nonblock;
1909 int err;
1910
1911 err = pcm_sanity_check(substream);
1912 if (err < 0)
1913 return err;
1914 runtime = substream->runtime;
1915 nonblock = !!(substream->f_flags & O_NONBLOCK);
1916
1917 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1918 runtime->channels > 1)
1919 return -EINVAL;
1920 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1921 snd_pcm_lib_write_transfer);
1922 }
1923
1924 EXPORT_SYMBOL(snd_pcm_lib_write);
1925
1926 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1927 unsigned int hwoff,
1928 unsigned long data, unsigned int off,
1929 snd_pcm_uframes_t frames)
1930 {
1931 struct snd_pcm_runtime *runtime = substream->runtime;
1932 int err;
1933 void __user **bufs = (void __user **)data;
1934 int channels = runtime->channels;
1935 int c;
1936 if (substream->ops->copy) {
1937 if (snd_BUG_ON(!substream->ops->silence))
1938 return -EINVAL;
1939 for (c = 0; c < channels; ++c, ++bufs) {
1940 if (*bufs == NULL) {
1941 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1942 return err;
1943 } else {
1944 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1945 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1946 return err;
1947 }
1948 }
1949 } else {
1950 /* default transfer behaviour */
1951 size_t dma_csize = runtime->dma_bytes / channels;
1952 for (c = 0; c < channels; ++c, ++bufs) {
1953 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1954 if (*bufs == NULL) {
1955 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1956 } else {
1957 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1958 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1959 return -EFAULT;
1960 }
1961 }
1962 }
1963 return 0;
1964 }
1965
1966 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1967 void __user **bufs,
1968 snd_pcm_uframes_t frames)
1969 {
1970 struct snd_pcm_runtime *runtime;
1971 int nonblock;
1972 int err;
1973
1974 err = pcm_sanity_check(substream);
1975 if (err < 0)
1976 return err;
1977 runtime = substream->runtime;
1978 nonblock = !!(substream->f_flags & O_NONBLOCK);
1979
1980 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1981 return -EINVAL;
1982 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1983 nonblock, snd_pcm_lib_writev_transfer);
1984 }
1985
1986 EXPORT_SYMBOL(snd_pcm_lib_writev);
1987
1988 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
1989 unsigned int hwoff,
1990 unsigned long data, unsigned int off,
1991 snd_pcm_uframes_t frames)
1992 {
1993 struct snd_pcm_runtime *runtime = substream->runtime;
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);
2001 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2002 return -EFAULT;
2003 }
2004 return 0;
2005 }
2006
2007 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2008 unsigned long data,
2009 snd_pcm_uframes_t size,
2010 int nonblock,
2011 transfer_f transfer)
2012 {
2013 struct snd_pcm_runtime *runtime = substream->runtime;
2014 snd_pcm_uframes_t xfer = 0;
2015 snd_pcm_uframes_t offset = 0;
2016 int err = 0;
2017
2018 if (size == 0)
2019 return 0;
2020
2021 snd_pcm_stream_lock_irq(substream);
2022 switch (runtime->status->state) {
2023 case SNDRV_PCM_STATE_PREPARED:
2024 if (size >= runtime->start_threshold) {
2025 err = snd_pcm_start(substream);
2026 if (err < 0)
2027 goto _end_unlock;
2028 }
2029 break;
2030 case SNDRV_PCM_STATE_DRAINING:
2031 case SNDRV_PCM_STATE_RUNNING:
2032 case SNDRV_PCM_STATE_PAUSED:
2033 break;
2034 case SNDRV_PCM_STATE_XRUN:
2035 err = -EPIPE;
2036 goto _end_unlock;
2037 case SNDRV_PCM_STATE_SUSPENDED:
2038 err = -ESTRPIPE;
2039 goto _end_unlock;
2040 default:
2041 err = -EBADFD;
2042 goto _end_unlock;
2043 }
2044
2045 runtime->twake = 1;
2046 while (size > 0) {
2047 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2048 snd_pcm_uframes_t avail;
2049 snd_pcm_uframes_t cont;
2050 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2051 snd_pcm_update_hw_ptr(substream);
2052 avail = snd_pcm_capture_avail(runtime);
2053 if (!avail) {
2054 if (runtime->status->state ==
2055 SNDRV_PCM_STATE_DRAINING) {
2056 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2057 goto _end_unlock;
2058 }
2059 if (nonblock) {
2060 err = -EAGAIN;
2061 goto _end_unlock;
2062 }
2063 err = wait_for_avail_min(substream, &avail);
2064 if (err < 0)
2065 goto _end_unlock;
2066 if (!avail)
2067 continue; /* draining */
2068 }
2069 frames = size > avail ? avail : size;
2070 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2071 if (frames > cont)
2072 frames = cont;
2073 if (snd_BUG_ON(!frames)) {
2074 runtime->twake = 0;
2075 snd_pcm_stream_unlock_irq(substream);
2076 return -EINVAL;
2077 }
2078 appl_ptr = runtime->control->appl_ptr;
2079 appl_ofs = appl_ptr % runtime->buffer_size;
2080 snd_pcm_stream_unlock_irq(substream);
2081 err = transfer(substream, appl_ofs, data, offset, frames);
2082 snd_pcm_stream_lock_irq(substream);
2083 if (err < 0)
2084 goto _end_unlock;
2085 switch (runtime->status->state) {
2086 case SNDRV_PCM_STATE_XRUN:
2087 err = -EPIPE;
2088 goto _end_unlock;
2089 case SNDRV_PCM_STATE_SUSPENDED:
2090 err = -ESTRPIPE;
2091 goto _end_unlock;
2092 default:
2093 break;
2094 }
2095 appl_ptr += frames;
2096 if (appl_ptr >= runtime->boundary)
2097 appl_ptr -= runtime->boundary;
2098 runtime->control->appl_ptr = appl_ptr;
2099 if (substream->ops->ack)
2100 substream->ops->ack(substream);
2101
2102 offset += frames;
2103 size -= frames;
2104 xfer += frames;
2105 }
2106 _end_unlock:
2107 runtime->twake = 0;
2108 if (xfer > 0 && err >= 0)
2109 snd_pcm_update_state(substream, runtime);
2110 snd_pcm_stream_unlock_irq(substream);
2111 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2112 }
2113
2114 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2115 {
2116 struct snd_pcm_runtime *runtime;
2117 int nonblock;
2118 int err;
2119
2120 err = pcm_sanity_check(substream);
2121 if (err < 0)
2122 return err;
2123 runtime = substream->runtime;
2124 nonblock = !!(substream->f_flags & O_NONBLOCK);
2125 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2126 return -EINVAL;
2127 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2128 }
2129
2130 EXPORT_SYMBOL(snd_pcm_lib_read);
2131
2132 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2133 unsigned int hwoff,
2134 unsigned long data, unsigned int off,
2135 snd_pcm_uframes_t frames)
2136 {
2137 struct snd_pcm_runtime *runtime = substream->runtime;
2138 int err;
2139 void __user **bufs = (void __user **)data;
2140 int channels = runtime->channels;
2141 int c;
2142 if (substream->ops->copy) {
2143 for (c = 0; c < channels; ++c, ++bufs) {
2144 char __user *buf;
2145 if (*bufs == NULL)
2146 continue;
2147 buf = *bufs + samples_to_bytes(runtime, off);
2148 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2149 return err;
2150 }
2151 } else {
2152 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2153 for (c = 0; c < channels; ++c, ++bufs) {
2154 char *hwbuf;
2155 char __user *buf;
2156 if (*bufs == NULL)
2157 continue;
2158
2159 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2160 buf = *bufs + samples_to_bytes(runtime, off);
2161 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2162 return -EFAULT;
2163 }
2164 }
2165 return 0;
2166 }
2167
2168 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2169 void __user **bufs,
2170 snd_pcm_uframes_t frames)
2171 {
2172 struct snd_pcm_runtime *runtime;
2173 int nonblock;
2174 int err;
2175
2176 err = pcm_sanity_check(substream);
2177 if (err < 0)
2178 return err;
2179 runtime = substream->runtime;
2180 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2181 return -EBADFD;
2182
2183 nonblock = !!(substream->f_flags & O_NONBLOCK);
2184 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2185 return -EINVAL;
2186 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2187 }
2188
2189 EXPORT_SYMBOL(snd_pcm_lib_readv);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree