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Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetoot...
[deliverable/linux.git] / sound / core / pcm_native.c
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/mm.h>
23 #include <linux/module.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos.h>
28 #include <linux/aio.h>
29 #include <linux/dma-mapping.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/pcm.h>
34 #include <sound/pcm_params.h>
35 #include <sound/timer.h>
36 #include <sound/minors.h>
37 #include <asm/io.h>
38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
39 #include <dma-coherence.h>
40 #endif
41
42 /*
43 * Compatibility
44 */
45
46 struct snd_pcm_hw_params_old {
47 unsigned int flags;
48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
49 SNDRV_PCM_HW_PARAM_ACCESS + 1];
50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
52 unsigned int rmask;
53 unsigned int cmask;
54 unsigned int info;
55 unsigned int msbits;
56 unsigned int rate_num;
57 unsigned int rate_den;
58 snd_pcm_uframes_t fifo_size;
59 unsigned char reserved[64];
60 };
61
62 #ifdef CONFIG_SND_SUPPORT_OLD_API
63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
65
66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70 #endif
71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73 /*
74 *
75 */
76
77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
79
80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
81
82 static inline mm_segment_t snd_enter_user(void)
83 {
84 mm_segment_t fs = get_fs();
85 set_fs(get_ds());
86 return fs;
87 }
88
89 static inline void snd_leave_user(mm_segment_t fs)
90 {
91 set_fs(fs);
92 }
93
94
95
96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
97 {
98 struct snd_pcm_runtime *runtime;
99 struct snd_pcm *pcm = substream->pcm;
100 struct snd_pcm_str *pstr = substream->pstr;
101
102 memset(info, 0, sizeof(*info));
103 info->card = pcm->card->number;
104 info->device = pcm->device;
105 info->stream = substream->stream;
106 info->subdevice = substream->number;
107 strlcpy(info->id, pcm->id, sizeof(info->id));
108 strlcpy(info->name, pcm->name, sizeof(info->name));
109 info->dev_class = pcm->dev_class;
110 info->dev_subclass = pcm->dev_subclass;
111 info->subdevices_count = pstr->substream_count;
112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
113 strlcpy(info->subname, substream->name, sizeof(info->subname));
114 runtime = substream->runtime;
115 /* AB: FIXME!!! This is definitely nonsense */
116 if (runtime) {
117 info->sync = runtime->sync;
118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
119 }
120 return 0;
121 }
122
123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
124 struct snd_pcm_info __user * _info)
125 {
126 struct snd_pcm_info *info;
127 int err;
128
129 info = kmalloc(sizeof(*info), GFP_KERNEL);
130 if (! info)
131 return -ENOMEM;
132 err = snd_pcm_info(substream, info);
133 if (err >= 0) {
134 if (copy_to_user(_info, info, sizeof(*info)))
135 err = -EFAULT;
136 }
137 kfree(info);
138 return err;
139 }
140
141 #undef RULES_DEBUG
142
143 #ifdef RULES_DEBUG
144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
145 static const char * const snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161 };
162 #endif
163
164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166 {
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192 #ifdef RULES_DEBUG
193 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
194 pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195 #endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197 #ifdef RULES_DEBUG
198 pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199 #endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212 #ifdef RULES_DEBUG
213 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 pr_cont("empty");
216 else
217 pr_cont("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 pr_cont(" -> ");
221 #endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223 #ifdef RULES_DEBUG
224 if (i->empty)
225 pr_cont("empty\n");
226 else
227 pr_cont("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230 #endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257 #ifdef RULES_DEBUG
258 pr_debug("Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 pr_cont("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 pr_cont("empty");
268 else
269 pr_cont("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274 #endif
275 changed = r->func(params, r);
276 #ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 pr_cont(" -> ");
279 if (hw_is_mask(r->var))
280 pr_cont("%x", *m->bits);
281 else {
282 if (i->empty)
283 pr_cont("empty");
284 else
285 pr_cont("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 pr_cont("\n");
291 #endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333 }
334
335 EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339 {
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355 }
356
357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
358 {
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370 }
371
372 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
373 {
374 snd_pcm_stream_lock_irq(substream);
375 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
376 substream->runtime->status->state = state;
377 snd_pcm_stream_unlock_irq(substream);
378 }
379
380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
381 struct snd_pcm_hw_params *params)
382 {
383 struct snd_pcm_runtime *runtime;
384 int err, usecs;
385 unsigned int bits;
386 snd_pcm_uframes_t frames;
387
388 if (PCM_RUNTIME_CHECK(substream))
389 return -ENXIO;
390 runtime = substream->runtime;
391 snd_pcm_stream_lock_irq(substream);
392 switch (runtime->status->state) {
393 case SNDRV_PCM_STATE_OPEN:
394 case SNDRV_PCM_STATE_SETUP:
395 case SNDRV_PCM_STATE_PREPARED:
396 break;
397 default:
398 snd_pcm_stream_unlock_irq(substream);
399 return -EBADFD;
400 }
401 snd_pcm_stream_unlock_irq(substream);
402 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
403 if (!substream->oss.oss)
404 #endif
405 if (atomic_read(&substream->mmap_count))
406 return -EBADFD;
407
408 params->rmask = ~0U;
409 err = snd_pcm_hw_refine(substream, params);
410 if (err < 0)
411 goto _error;
412
413 err = snd_pcm_hw_params_choose(substream, params);
414 if (err < 0)
415 goto _error;
416
417 if (substream->ops->hw_params != NULL) {
418 err = substream->ops->hw_params(substream, params);
419 if (err < 0)
420 goto _error;
421 }
422
423 runtime->access = params_access(params);
424 runtime->format = params_format(params);
425 runtime->subformat = params_subformat(params);
426 runtime->channels = params_channels(params);
427 runtime->rate = params_rate(params);
428 runtime->period_size = params_period_size(params);
429 runtime->periods = params_periods(params);
430 runtime->buffer_size = params_buffer_size(params);
431 runtime->info = params->info;
432 runtime->rate_num = params->rate_num;
433 runtime->rate_den = params->rate_den;
434 runtime->no_period_wakeup =
435 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
436 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
437
438 bits = snd_pcm_format_physical_width(runtime->format);
439 runtime->sample_bits = bits;
440 bits *= runtime->channels;
441 runtime->frame_bits = bits;
442 frames = 1;
443 while (bits % 8 != 0) {
444 bits *= 2;
445 frames *= 2;
446 }
447 runtime->byte_align = bits / 8;
448 runtime->min_align = frames;
449
450 /* Default sw params */
451 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
452 runtime->period_step = 1;
453 runtime->control->avail_min = runtime->period_size;
454 runtime->start_threshold = 1;
455 runtime->stop_threshold = runtime->buffer_size;
456 runtime->silence_threshold = 0;
457 runtime->silence_size = 0;
458 runtime->boundary = runtime->buffer_size;
459 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
460 runtime->boundary *= 2;
461
462 snd_pcm_timer_resolution_change(substream);
463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
464
465 if (pm_qos_request_active(&substream->latency_pm_qos_req))
466 pm_qos_remove_request(&substream->latency_pm_qos_req);
467 if ((usecs = period_to_usecs(runtime)) >= 0)
468 pm_qos_add_request(&substream->latency_pm_qos_req,
469 PM_QOS_CPU_DMA_LATENCY, usecs);
470 return 0;
471 _error:
472 /* hardware might be unusable from this time,
473 so we force application to retry to set
474 the correct hardware parameter settings */
475 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
476 if (substream->ops->hw_free != NULL)
477 substream->ops->hw_free(substream);
478 return err;
479 }
480
481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
482 struct snd_pcm_hw_params __user * _params)
483 {
484 struct snd_pcm_hw_params *params;
485 int err;
486
487 params = memdup_user(_params, sizeof(*params));
488 if (IS_ERR(params))
489 return PTR_ERR(params);
490
491 err = snd_pcm_hw_params(substream, params);
492 if (copy_to_user(_params, params, sizeof(*params))) {
493 if (!err)
494 err = -EFAULT;
495 }
496
497 kfree(params);
498 return err;
499 }
500
501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
502 {
503 struct snd_pcm_runtime *runtime;
504 int result = 0;
505
506 if (PCM_RUNTIME_CHECK(substream))
507 return -ENXIO;
508 runtime = substream->runtime;
509 snd_pcm_stream_lock_irq(substream);
510 switch (runtime->status->state) {
511 case SNDRV_PCM_STATE_SETUP:
512 case SNDRV_PCM_STATE_PREPARED:
513 break;
514 default:
515 snd_pcm_stream_unlock_irq(substream);
516 return -EBADFD;
517 }
518 snd_pcm_stream_unlock_irq(substream);
519 if (atomic_read(&substream->mmap_count))
520 return -EBADFD;
521 if (substream->ops->hw_free)
522 result = substream->ops->hw_free(substream);
523 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
524 pm_qos_remove_request(&substream->latency_pm_qos_req);
525 return result;
526 }
527
528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
529 struct snd_pcm_sw_params *params)
530 {
531 struct snd_pcm_runtime *runtime;
532 int err;
533
534 if (PCM_RUNTIME_CHECK(substream))
535 return -ENXIO;
536 runtime = substream->runtime;
537 snd_pcm_stream_lock_irq(substream);
538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
539 snd_pcm_stream_unlock_irq(substream);
540 return -EBADFD;
541 }
542 snd_pcm_stream_unlock_irq(substream);
543
544 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
545 return -EINVAL;
546 if (params->avail_min == 0)
547 return -EINVAL;
548 if (params->silence_size >= runtime->boundary) {
549 if (params->silence_threshold != 0)
550 return -EINVAL;
551 } else {
552 if (params->silence_size > params->silence_threshold)
553 return -EINVAL;
554 if (params->silence_threshold > runtime->buffer_size)
555 return -EINVAL;
556 }
557 err = 0;
558 snd_pcm_stream_lock_irq(substream);
559 runtime->tstamp_mode = params->tstamp_mode;
560 runtime->period_step = params->period_step;
561 runtime->control->avail_min = params->avail_min;
562 runtime->start_threshold = params->start_threshold;
563 runtime->stop_threshold = params->stop_threshold;
564 runtime->silence_threshold = params->silence_threshold;
565 runtime->silence_size = params->silence_size;
566 params->boundary = runtime->boundary;
567 if (snd_pcm_running(substream)) {
568 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
569 runtime->silence_size > 0)
570 snd_pcm_playback_silence(substream, ULONG_MAX);
571 err = snd_pcm_update_state(substream, runtime);
572 }
573 snd_pcm_stream_unlock_irq(substream);
574 return err;
575 }
576
577 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
578 struct snd_pcm_sw_params __user * _params)
579 {
580 struct snd_pcm_sw_params params;
581 int err;
582 if (copy_from_user(&params, _params, sizeof(params)))
583 return -EFAULT;
584 err = snd_pcm_sw_params(substream, &params);
585 if (copy_to_user(_params, &params, sizeof(params)))
586 return -EFAULT;
587 return err;
588 }
589
590 int snd_pcm_status(struct snd_pcm_substream *substream,
591 struct snd_pcm_status *status)
592 {
593 struct snd_pcm_runtime *runtime = substream->runtime;
594
595 snd_pcm_stream_lock_irq(substream);
596 status->state = runtime->status->state;
597 status->suspended_state = runtime->status->suspended_state;
598 if (status->state == SNDRV_PCM_STATE_OPEN)
599 goto _end;
600 status->trigger_tstamp = runtime->trigger_tstamp;
601 if (snd_pcm_running(substream)) {
602 snd_pcm_update_hw_ptr(substream);
603 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
604 status->tstamp = runtime->status->tstamp;
605 status->audio_tstamp =
606 runtime->status->audio_tstamp;
607 goto _tstamp_end;
608 }
609 }
610 snd_pcm_gettime(runtime, &status->tstamp);
611 _tstamp_end:
612 status->appl_ptr = runtime->control->appl_ptr;
613 status->hw_ptr = runtime->status->hw_ptr;
614 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
615 status->avail = snd_pcm_playback_avail(runtime);
616 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
617 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
618 status->delay = runtime->buffer_size - status->avail;
619 status->delay += runtime->delay;
620 } else
621 status->delay = 0;
622 } else {
623 status->avail = snd_pcm_capture_avail(runtime);
624 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
625 status->delay = status->avail + runtime->delay;
626 else
627 status->delay = 0;
628 }
629 status->avail_max = runtime->avail_max;
630 status->overrange = runtime->overrange;
631 runtime->avail_max = 0;
632 runtime->overrange = 0;
633 _end:
634 snd_pcm_stream_unlock_irq(substream);
635 return 0;
636 }
637
638 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
639 struct snd_pcm_status __user * _status)
640 {
641 struct snd_pcm_status status;
642 int res;
643
644 memset(&status, 0, sizeof(status));
645 res = snd_pcm_status(substream, &status);
646 if (res < 0)
647 return res;
648 if (copy_to_user(_status, &status, sizeof(status)))
649 return -EFAULT;
650 return 0;
651 }
652
653 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
654 struct snd_pcm_channel_info * info)
655 {
656 struct snd_pcm_runtime *runtime;
657 unsigned int channel;
658
659 channel = info->channel;
660 runtime = substream->runtime;
661 snd_pcm_stream_lock_irq(substream);
662 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
663 snd_pcm_stream_unlock_irq(substream);
664 return -EBADFD;
665 }
666 snd_pcm_stream_unlock_irq(substream);
667 if (channel >= runtime->channels)
668 return -EINVAL;
669 memset(info, 0, sizeof(*info));
670 info->channel = channel;
671 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
672 }
673
674 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
675 struct snd_pcm_channel_info __user * _info)
676 {
677 struct snd_pcm_channel_info info;
678 int res;
679
680 if (copy_from_user(&info, _info, sizeof(info)))
681 return -EFAULT;
682 res = snd_pcm_channel_info(substream, &info);
683 if (res < 0)
684 return res;
685 if (copy_to_user(_info, &info, sizeof(info)))
686 return -EFAULT;
687 return 0;
688 }
689
690 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
691 {
692 struct snd_pcm_runtime *runtime = substream->runtime;
693 if (runtime->trigger_master == NULL)
694 return;
695 if (runtime->trigger_master == substream) {
696 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
697 } else {
698 snd_pcm_trigger_tstamp(runtime->trigger_master);
699 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
700 }
701 runtime->trigger_master = NULL;
702 }
703
704 struct action_ops {
705 int (*pre_action)(struct snd_pcm_substream *substream, int state);
706 int (*do_action)(struct snd_pcm_substream *substream, int state);
707 void (*undo_action)(struct snd_pcm_substream *substream, int state);
708 void (*post_action)(struct snd_pcm_substream *substream, int state);
709 };
710
711 /*
712 * this functions is core for handling of linked stream
713 * Note: the stream state might be changed also on failure
714 * Note2: call with calling stream lock + link lock
715 */
716 static int snd_pcm_action_group(struct action_ops *ops,
717 struct snd_pcm_substream *substream,
718 int state, int do_lock)
719 {
720 struct snd_pcm_substream *s = NULL;
721 struct snd_pcm_substream *s1;
722 int res = 0;
723
724 snd_pcm_group_for_each_entry(s, substream) {
725 if (do_lock && s != substream)
726 spin_lock_nested(&s->self_group.lock,
727 SINGLE_DEPTH_NESTING);
728 res = ops->pre_action(s, state);
729 if (res < 0)
730 goto _unlock;
731 }
732 snd_pcm_group_for_each_entry(s, substream) {
733 res = ops->do_action(s, state);
734 if (res < 0) {
735 if (ops->undo_action) {
736 snd_pcm_group_for_each_entry(s1, substream) {
737 if (s1 == s) /* failed stream */
738 break;
739 ops->undo_action(s1, state);
740 }
741 }
742 s = NULL; /* unlock all */
743 goto _unlock;
744 }
745 }
746 snd_pcm_group_for_each_entry(s, substream) {
747 ops->post_action(s, state);
748 }
749 _unlock:
750 if (do_lock) {
751 /* unlock streams */
752 snd_pcm_group_for_each_entry(s1, substream) {
753 if (s1 != substream)
754 spin_unlock(&s1->self_group.lock);
755 if (s1 == s) /* end */
756 break;
757 }
758 }
759 return res;
760 }
761
762 /*
763 * Note: call with stream lock
764 */
765 static int snd_pcm_action_single(struct action_ops *ops,
766 struct snd_pcm_substream *substream,
767 int state)
768 {
769 int res;
770
771 res = ops->pre_action(substream, state);
772 if (res < 0)
773 return res;
774 res = ops->do_action(substream, state);
775 if (res == 0)
776 ops->post_action(substream, state);
777 else if (ops->undo_action)
778 ops->undo_action(substream, state);
779 return res;
780 }
781
782 /*
783 * Note: call with stream lock
784 */
785 static int snd_pcm_action(struct action_ops *ops,
786 struct snd_pcm_substream *substream,
787 int state)
788 {
789 int res;
790
791 if (snd_pcm_stream_linked(substream)) {
792 if (!spin_trylock(&substream->group->lock)) {
793 spin_unlock(&substream->self_group.lock);
794 spin_lock(&substream->group->lock);
795 spin_lock(&substream->self_group.lock);
796 }
797 res = snd_pcm_action_group(ops, substream, state, 1);
798 spin_unlock(&substream->group->lock);
799 } else {
800 res = snd_pcm_action_single(ops, substream, state);
801 }
802 return res;
803 }
804
805 /*
806 * Note: don't use any locks before
807 */
808 static int snd_pcm_action_lock_irq(struct action_ops *ops,
809 struct snd_pcm_substream *substream,
810 int state)
811 {
812 int res;
813
814 read_lock_irq(&snd_pcm_link_rwlock);
815 if (snd_pcm_stream_linked(substream)) {
816 spin_lock(&substream->group->lock);
817 spin_lock(&substream->self_group.lock);
818 res = snd_pcm_action_group(ops, substream, state, 1);
819 spin_unlock(&substream->self_group.lock);
820 spin_unlock(&substream->group->lock);
821 } else {
822 spin_lock(&substream->self_group.lock);
823 res = snd_pcm_action_single(ops, substream, state);
824 spin_unlock(&substream->self_group.lock);
825 }
826 read_unlock_irq(&snd_pcm_link_rwlock);
827 return res;
828 }
829
830 /*
831 */
832 static int snd_pcm_action_nonatomic(struct action_ops *ops,
833 struct snd_pcm_substream *substream,
834 int state)
835 {
836 int res;
837
838 down_read(&snd_pcm_link_rwsem);
839 if (snd_pcm_stream_linked(substream))
840 res = snd_pcm_action_group(ops, substream, state, 0);
841 else
842 res = snd_pcm_action_single(ops, substream, state);
843 up_read(&snd_pcm_link_rwsem);
844 return res;
845 }
846
847 /*
848 * start callbacks
849 */
850 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
851 {
852 struct snd_pcm_runtime *runtime = substream->runtime;
853 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
854 return -EBADFD;
855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
856 !snd_pcm_playback_data(substream))
857 return -EPIPE;
858 runtime->trigger_master = substream;
859 return 0;
860 }
861
862 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
863 {
864 if (substream->runtime->trigger_master != substream)
865 return 0;
866 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
867 }
868
869 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
870 {
871 if (substream->runtime->trigger_master == substream)
872 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
873 }
874
875 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
876 {
877 struct snd_pcm_runtime *runtime = substream->runtime;
878 snd_pcm_trigger_tstamp(substream);
879 runtime->hw_ptr_jiffies = jiffies;
880 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
881 runtime->rate;
882 runtime->status->state = state;
883 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
884 runtime->silence_size > 0)
885 snd_pcm_playback_silence(substream, ULONG_MAX);
886 if (substream->timer)
887 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
888 &runtime->trigger_tstamp);
889 }
890
891 static struct action_ops snd_pcm_action_start = {
892 .pre_action = snd_pcm_pre_start,
893 .do_action = snd_pcm_do_start,
894 .undo_action = snd_pcm_undo_start,
895 .post_action = snd_pcm_post_start
896 };
897
898 /**
899 * snd_pcm_start - start all linked streams
900 * @substream: the PCM substream instance
901 *
902 * Return: Zero if successful, or a negative error code.
903 */
904 int snd_pcm_start(struct snd_pcm_substream *substream)
905 {
906 return snd_pcm_action(&snd_pcm_action_start, substream,
907 SNDRV_PCM_STATE_RUNNING);
908 }
909
910 /*
911 * stop callbacks
912 */
913 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
914 {
915 struct snd_pcm_runtime *runtime = substream->runtime;
916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
917 return -EBADFD;
918 runtime->trigger_master = substream;
919 return 0;
920 }
921
922 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
923 {
924 if (substream->runtime->trigger_master == substream &&
925 snd_pcm_running(substream))
926 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
927 return 0; /* unconditonally stop all substreams */
928 }
929
930 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
931 {
932 struct snd_pcm_runtime *runtime = substream->runtime;
933 if (runtime->status->state != state) {
934 snd_pcm_trigger_tstamp(substream);
935 if (substream->timer)
936 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
937 &runtime->trigger_tstamp);
938 runtime->status->state = state;
939 }
940 wake_up(&runtime->sleep);
941 wake_up(&runtime->tsleep);
942 }
943
944 static struct action_ops snd_pcm_action_stop = {
945 .pre_action = snd_pcm_pre_stop,
946 .do_action = snd_pcm_do_stop,
947 .post_action = snd_pcm_post_stop
948 };
949
950 /**
951 * snd_pcm_stop - try to stop all running streams in the substream group
952 * @substream: the PCM substream instance
953 * @state: PCM state after stopping the stream
954 *
955 * The state of each stream is then changed to the given state unconditionally.
956 *
957 * Return: Zero if successful, or a negative error code.
958 */
959 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
960 {
961 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
962 }
963
964 EXPORT_SYMBOL(snd_pcm_stop);
965
966 /**
967 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
968 * @substream: the PCM substream
969 *
970 * After stopping, the state is changed to SETUP.
971 * Unlike snd_pcm_stop(), this affects only the given stream.
972 *
973 * Return: Zero if succesful, or a negative error code.
974 */
975 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
976 {
977 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
978 SNDRV_PCM_STATE_SETUP);
979 }
980
981 /*
982 * pause callbacks
983 */
984 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
985 {
986 struct snd_pcm_runtime *runtime = substream->runtime;
987 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
988 return -ENOSYS;
989 if (push) {
990 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
991 return -EBADFD;
992 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
993 return -EBADFD;
994 runtime->trigger_master = substream;
995 return 0;
996 }
997
998 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
999 {
1000 if (substream->runtime->trigger_master != substream)
1001 return 0;
1002 /* some drivers might use hw_ptr to recover from the pause -
1003 update the hw_ptr now */
1004 if (push)
1005 snd_pcm_update_hw_ptr(substream);
1006 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1007 * a delta between the current jiffies, this gives a large enough
1008 * delta, effectively to skip the check once.
1009 */
1010 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1011 return substream->ops->trigger(substream,
1012 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1013 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1014 }
1015
1016 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1017 {
1018 if (substream->runtime->trigger_master == substream)
1019 substream->ops->trigger(substream,
1020 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1021 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1022 }
1023
1024 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1025 {
1026 struct snd_pcm_runtime *runtime = substream->runtime;
1027 snd_pcm_trigger_tstamp(substream);
1028 if (push) {
1029 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1030 if (substream->timer)
1031 snd_timer_notify(substream->timer,
1032 SNDRV_TIMER_EVENT_MPAUSE,
1033 &runtime->trigger_tstamp);
1034 wake_up(&runtime->sleep);
1035 wake_up(&runtime->tsleep);
1036 } else {
1037 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1038 if (substream->timer)
1039 snd_timer_notify(substream->timer,
1040 SNDRV_TIMER_EVENT_MCONTINUE,
1041 &runtime->trigger_tstamp);
1042 }
1043 }
1044
1045 static struct action_ops snd_pcm_action_pause = {
1046 .pre_action = snd_pcm_pre_pause,
1047 .do_action = snd_pcm_do_pause,
1048 .undo_action = snd_pcm_undo_pause,
1049 .post_action = snd_pcm_post_pause
1050 };
1051
1052 /*
1053 * Push/release the pause for all linked streams.
1054 */
1055 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1056 {
1057 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1058 }
1059
1060 #ifdef CONFIG_PM
1061 /* suspend */
1062
1063 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1064 {
1065 struct snd_pcm_runtime *runtime = substream->runtime;
1066 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1067 return -EBUSY;
1068 runtime->trigger_master = substream;
1069 return 0;
1070 }
1071
1072 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1073 {
1074 struct snd_pcm_runtime *runtime = substream->runtime;
1075 if (runtime->trigger_master != substream)
1076 return 0;
1077 if (! snd_pcm_running(substream))
1078 return 0;
1079 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1080 return 0; /* suspend unconditionally */
1081 }
1082
1083 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1084 {
1085 struct snd_pcm_runtime *runtime = substream->runtime;
1086 snd_pcm_trigger_tstamp(substream);
1087 if (substream->timer)
1088 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1089 &runtime->trigger_tstamp);
1090 runtime->status->suspended_state = runtime->status->state;
1091 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1092 wake_up(&runtime->sleep);
1093 wake_up(&runtime->tsleep);
1094 }
1095
1096 static struct action_ops snd_pcm_action_suspend = {
1097 .pre_action = snd_pcm_pre_suspend,
1098 .do_action = snd_pcm_do_suspend,
1099 .post_action = snd_pcm_post_suspend
1100 };
1101
1102 /**
1103 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1104 * @substream: the PCM substream
1105 *
1106 * After this call, all streams are changed to SUSPENDED state.
1107 *
1108 * Return: Zero if successful (or @substream is %NULL), or a negative error
1109 * code.
1110 */
1111 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1112 {
1113 int err;
1114 unsigned long flags;
1115
1116 if (! substream)
1117 return 0;
1118
1119 snd_pcm_stream_lock_irqsave(substream, flags);
1120 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1121 snd_pcm_stream_unlock_irqrestore(substream, flags);
1122 return err;
1123 }
1124
1125 EXPORT_SYMBOL(snd_pcm_suspend);
1126
1127 /**
1128 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1129 * @pcm: the PCM instance
1130 *
1131 * After this call, all streams are changed to SUSPENDED state.
1132 *
1133 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1134 */
1135 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1136 {
1137 struct snd_pcm_substream *substream;
1138 int stream, err = 0;
1139
1140 if (! pcm)
1141 return 0;
1142
1143 for (stream = 0; stream < 2; stream++) {
1144 for (substream = pcm->streams[stream].substream;
1145 substream; substream = substream->next) {
1146 /* FIXME: the open/close code should lock this as well */
1147 if (substream->runtime == NULL)
1148 continue;
1149 err = snd_pcm_suspend(substream);
1150 if (err < 0 && err != -EBUSY)
1151 return err;
1152 }
1153 }
1154 return 0;
1155 }
1156
1157 EXPORT_SYMBOL(snd_pcm_suspend_all);
1158
1159 /* resume */
1160
1161 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1162 {
1163 struct snd_pcm_runtime *runtime = substream->runtime;
1164 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1165 return -ENOSYS;
1166 runtime->trigger_master = substream;
1167 return 0;
1168 }
1169
1170 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1171 {
1172 struct snd_pcm_runtime *runtime = substream->runtime;
1173 if (runtime->trigger_master != substream)
1174 return 0;
1175 /* DMA not running previously? */
1176 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1177 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1178 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1179 return 0;
1180 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1181 }
1182
1183 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1184 {
1185 if (substream->runtime->trigger_master == substream &&
1186 snd_pcm_running(substream))
1187 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1188 }
1189
1190 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1191 {
1192 struct snd_pcm_runtime *runtime = substream->runtime;
1193 snd_pcm_trigger_tstamp(substream);
1194 if (substream->timer)
1195 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1196 &runtime->trigger_tstamp);
1197 runtime->status->state = runtime->status->suspended_state;
1198 }
1199
1200 static struct action_ops snd_pcm_action_resume = {
1201 .pre_action = snd_pcm_pre_resume,
1202 .do_action = snd_pcm_do_resume,
1203 .undo_action = snd_pcm_undo_resume,
1204 .post_action = snd_pcm_post_resume
1205 };
1206
1207 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1208 {
1209 struct snd_card *card = substream->pcm->card;
1210 int res;
1211
1212 snd_power_lock(card);
1213 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1214 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1215 snd_power_unlock(card);
1216 return res;
1217 }
1218
1219 #else
1220
1221 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1222 {
1223 return -ENOSYS;
1224 }
1225
1226 #endif /* CONFIG_PM */
1227
1228 /*
1229 * xrun ioctl
1230 *
1231 * Change the RUNNING stream(s) to XRUN state.
1232 */
1233 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1234 {
1235 struct snd_card *card = substream->pcm->card;
1236 struct snd_pcm_runtime *runtime = substream->runtime;
1237 int result;
1238
1239 snd_power_lock(card);
1240 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1241 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1242 if (result < 0)
1243 goto _unlock;
1244 }
1245
1246 snd_pcm_stream_lock_irq(substream);
1247 switch (runtime->status->state) {
1248 case SNDRV_PCM_STATE_XRUN:
1249 result = 0; /* already there */
1250 break;
1251 case SNDRV_PCM_STATE_RUNNING:
1252 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1253 break;
1254 default:
1255 result = -EBADFD;
1256 }
1257 snd_pcm_stream_unlock_irq(substream);
1258 _unlock:
1259 snd_power_unlock(card);
1260 return result;
1261 }
1262
1263 /*
1264 * reset ioctl
1265 */
1266 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1267 {
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 switch (runtime->status->state) {
1270 case SNDRV_PCM_STATE_RUNNING:
1271 case SNDRV_PCM_STATE_PREPARED:
1272 case SNDRV_PCM_STATE_PAUSED:
1273 case SNDRV_PCM_STATE_SUSPENDED:
1274 return 0;
1275 default:
1276 return -EBADFD;
1277 }
1278 }
1279
1280 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1281 {
1282 struct snd_pcm_runtime *runtime = substream->runtime;
1283 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1284 if (err < 0)
1285 return err;
1286 runtime->hw_ptr_base = 0;
1287 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1288 runtime->status->hw_ptr % runtime->period_size;
1289 runtime->silence_start = runtime->status->hw_ptr;
1290 runtime->silence_filled = 0;
1291 return 0;
1292 }
1293
1294 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1295 {
1296 struct snd_pcm_runtime *runtime = substream->runtime;
1297 runtime->control->appl_ptr = runtime->status->hw_ptr;
1298 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1299 runtime->silence_size > 0)
1300 snd_pcm_playback_silence(substream, ULONG_MAX);
1301 }
1302
1303 static struct action_ops snd_pcm_action_reset = {
1304 .pre_action = snd_pcm_pre_reset,
1305 .do_action = snd_pcm_do_reset,
1306 .post_action = snd_pcm_post_reset
1307 };
1308
1309 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1310 {
1311 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1312 }
1313
1314 /*
1315 * prepare ioctl
1316 */
1317 /* we use the second argument for updating f_flags */
1318 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1319 int f_flags)
1320 {
1321 struct snd_pcm_runtime *runtime = substream->runtime;
1322 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1323 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1324 return -EBADFD;
1325 if (snd_pcm_running(substream))
1326 return -EBUSY;
1327 substream->f_flags = f_flags;
1328 return 0;
1329 }
1330
1331 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1332 {
1333 int err;
1334 err = substream->ops->prepare(substream);
1335 if (err < 0)
1336 return err;
1337 return snd_pcm_do_reset(substream, 0);
1338 }
1339
1340 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1341 {
1342 struct snd_pcm_runtime *runtime = substream->runtime;
1343 runtime->control->appl_ptr = runtime->status->hw_ptr;
1344 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1345 }
1346
1347 static struct action_ops snd_pcm_action_prepare = {
1348 .pre_action = snd_pcm_pre_prepare,
1349 .do_action = snd_pcm_do_prepare,
1350 .post_action = snd_pcm_post_prepare
1351 };
1352
1353 /**
1354 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1355 * @substream: the PCM substream instance
1356 * @file: file to refer f_flags
1357 *
1358 * Return: Zero if successful, or a negative error code.
1359 */
1360 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1361 struct file *file)
1362 {
1363 int res;
1364 struct snd_card *card = substream->pcm->card;
1365 int f_flags;
1366
1367 if (file)
1368 f_flags = file->f_flags;
1369 else
1370 f_flags = substream->f_flags;
1371
1372 snd_power_lock(card);
1373 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1374 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1375 substream, f_flags);
1376 snd_power_unlock(card);
1377 return res;
1378 }
1379
1380 /*
1381 * drain ioctl
1382 */
1383
1384 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1385 {
1386 struct snd_pcm_runtime *runtime = substream->runtime;
1387 switch (runtime->status->state) {
1388 case SNDRV_PCM_STATE_OPEN:
1389 case SNDRV_PCM_STATE_DISCONNECTED:
1390 case SNDRV_PCM_STATE_SUSPENDED:
1391 return -EBADFD;
1392 }
1393 runtime->trigger_master = substream;
1394 return 0;
1395 }
1396
1397 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1398 {
1399 struct snd_pcm_runtime *runtime = substream->runtime;
1400 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1401 switch (runtime->status->state) {
1402 case SNDRV_PCM_STATE_PREPARED:
1403 /* start playback stream if possible */
1404 if (! snd_pcm_playback_empty(substream)) {
1405 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1406 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1407 }
1408 break;
1409 case SNDRV_PCM_STATE_RUNNING:
1410 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1411 break;
1412 case SNDRV_PCM_STATE_XRUN:
1413 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1414 break;
1415 default:
1416 break;
1417 }
1418 } else {
1419 /* stop running stream */
1420 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1421 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1422 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1423 snd_pcm_do_stop(substream, new_state);
1424 snd_pcm_post_stop(substream, new_state);
1425 }
1426 }
1427 return 0;
1428 }
1429
1430 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1431 {
1432 }
1433
1434 static struct action_ops snd_pcm_action_drain_init = {
1435 .pre_action = snd_pcm_pre_drain_init,
1436 .do_action = snd_pcm_do_drain_init,
1437 .post_action = snd_pcm_post_drain_init
1438 };
1439
1440 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1441
1442 /*
1443 * Drain the stream(s).
1444 * When the substream is linked, sync until the draining of all playback streams
1445 * is finished.
1446 * After this call, all streams are supposed to be either SETUP or DRAINING
1447 * (capture only) state.
1448 */
1449 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1450 struct file *file)
1451 {
1452 struct snd_card *card;
1453 struct snd_pcm_runtime *runtime;
1454 struct snd_pcm_substream *s;
1455 wait_queue_t wait;
1456 int result = 0;
1457 int nonblock = 0;
1458
1459 card = substream->pcm->card;
1460 runtime = substream->runtime;
1461
1462 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1463 return -EBADFD;
1464
1465 snd_power_lock(card);
1466 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1467 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1468 if (result < 0) {
1469 snd_power_unlock(card);
1470 return result;
1471 }
1472 }
1473
1474 if (file) {
1475 if (file->f_flags & O_NONBLOCK)
1476 nonblock = 1;
1477 } else if (substream->f_flags & O_NONBLOCK)
1478 nonblock = 1;
1479
1480 down_read(&snd_pcm_link_rwsem);
1481 snd_pcm_stream_lock_irq(substream);
1482 /* resume pause */
1483 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1484 snd_pcm_pause(substream, 0);
1485
1486 /* pre-start/stop - all running streams are changed to DRAINING state */
1487 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1488 if (result < 0)
1489 goto unlock;
1490 /* in non-blocking, we don't wait in ioctl but let caller poll */
1491 if (nonblock) {
1492 result = -EAGAIN;
1493 goto unlock;
1494 }
1495
1496 for (;;) {
1497 long tout;
1498 struct snd_pcm_runtime *to_check;
1499 if (signal_pending(current)) {
1500 result = -ERESTARTSYS;
1501 break;
1502 }
1503 /* find a substream to drain */
1504 to_check = NULL;
1505 snd_pcm_group_for_each_entry(s, substream) {
1506 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1507 continue;
1508 runtime = s->runtime;
1509 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1510 to_check = runtime;
1511 break;
1512 }
1513 }
1514 if (!to_check)
1515 break; /* all drained */
1516 init_waitqueue_entry(&wait, current);
1517 add_wait_queue(&to_check->sleep, &wait);
1518 snd_pcm_stream_unlock_irq(substream);
1519 up_read(&snd_pcm_link_rwsem);
1520 snd_power_unlock(card);
1521 if (runtime->no_period_wakeup)
1522 tout = MAX_SCHEDULE_TIMEOUT;
1523 else {
1524 tout = 10;
1525 if (runtime->rate) {
1526 long t = runtime->period_size * 2 / runtime->rate;
1527 tout = max(t, tout);
1528 }
1529 tout = msecs_to_jiffies(tout * 1000);
1530 }
1531 tout = schedule_timeout_interruptible(tout);
1532 snd_power_lock(card);
1533 down_read(&snd_pcm_link_rwsem);
1534 snd_pcm_stream_lock_irq(substream);
1535 remove_wait_queue(&to_check->sleep, &wait);
1536 if (card->shutdown) {
1537 result = -ENODEV;
1538 break;
1539 }
1540 if (tout == 0) {
1541 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1542 result = -ESTRPIPE;
1543 else {
1544 dev_dbg(substream->pcm->card->dev,
1545 "playback drain error (DMA or IRQ trouble?)\n");
1546 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1547 result = -EIO;
1548 }
1549 break;
1550 }
1551 }
1552
1553 unlock:
1554 snd_pcm_stream_unlock_irq(substream);
1555 up_read(&snd_pcm_link_rwsem);
1556 snd_power_unlock(card);
1557
1558 return result;
1559 }
1560
1561 /*
1562 * drop ioctl
1563 *
1564 * Immediately put all linked substreams into SETUP state.
1565 */
1566 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1567 {
1568 struct snd_pcm_runtime *runtime;
1569 int result = 0;
1570
1571 if (PCM_RUNTIME_CHECK(substream))
1572 return -ENXIO;
1573 runtime = substream->runtime;
1574
1575 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1576 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1577 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1578 return -EBADFD;
1579
1580 snd_pcm_stream_lock_irq(substream);
1581 /* resume pause */
1582 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1583 snd_pcm_pause(substream, 0);
1584
1585 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1586 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1587 snd_pcm_stream_unlock_irq(substream);
1588
1589 return result;
1590 }
1591
1592
1593 static bool is_pcm_file(struct file *file)
1594 {
1595 struct inode *inode = file_inode(file);
1596 unsigned int minor;
1597
1598 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1599 return false;
1600 minor = iminor(inode);
1601 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1602 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1603 }
1604
1605 /*
1606 * PCM link handling
1607 */
1608 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1609 {
1610 int res = 0;
1611 struct snd_pcm_file *pcm_file;
1612 struct snd_pcm_substream *substream1;
1613 struct snd_pcm_group *group;
1614 struct fd f = fdget(fd);
1615
1616 if (!f.file)
1617 return -EBADFD;
1618 if (!is_pcm_file(f.file)) {
1619 res = -EBADFD;
1620 goto _badf;
1621 }
1622 pcm_file = f.file->private_data;
1623 substream1 = pcm_file->substream;
1624 group = kmalloc(sizeof(*group), GFP_KERNEL);
1625 if (!group) {
1626 res = -ENOMEM;
1627 goto _nolock;
1628 }
1629 down_write(&snd_pcm_link_rwsem);
1630 write_lock_irq(&snd_pcm_link_rwlock);
1631 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1632 substream->runtime->status->state != substream1->runtime->status->state) {
1633 res = -EBADFD;
1634 goto _end;
1635 }
1636 if (snd_pcm_stream_linked(substream1)) {
1637 res = -EALREADY;
1638 goto _end;
1639 }
1640 if (!snd_pcm_stream_linked(substream)) {
1641 substream->group = group;
1642 group = NULL;
1643 spin_lock_init(&substream->group->lock);
1644 INIT_LIST_HEAD(&substream->group->substreams);
1645 list_add_tail(&substream->link_list, &substream->group->substreams);
1646 substream->group->count = 1;
1647 }
1648 list_add_tail(&substream1->link_list, &substream->group->substreams);
1649 substream->group->count++;
1650 substream1->group = substream->group;
1651 _end:
1652 write_unlock_irq(&snd_pcm_link_rwlock);
1653 up_write(&snd_pcm_link_rwsem);
1654 _nolock:
1655 snd_card_unref(substream1->pcm->card);
1656 kfree(group);
1657 _badf:
1658 fdput(f);
1659 return res;
1660 }
1661
1662 static void relink_to_local(struct snd_pcm_substream *substream)
1663 {
1664 substream->group = &substream->self_group;
1665 INIT_LIST_HEAD(&substream->self_group.substreams);
1666 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1667 }
1668
1669 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1670 {
1671 struct snd_pcm_substream *s;
1672 int res = 0;
1673
1674 down_write(&snd_pcm_link_rwsem);
1675 write_lock_irq(&snd_pcm_link_rwlock);
1676 if (!snd_pcm_stream_linked(substream)) {
1677 res = -EALREADY;
1678 goto _end;
1679 }
1680 list_del(&substream->link_list);
1681 substream->group->count--;
1682 if (substream->group->count == 1) { /* detach the last stream, too */
1683 snd_pcm_group_for_each_entry(s, substream) {
1684 relink_to_local(s);
1685 break;
1686 }
1687 kfree(substream->group);
1688 }
1689 relink_to_local(substream);
1690 _end:
1691 write_unlock_irq(&snd_pcm_link_rwlock);
1692 up_write(&snd_pcm_link_rwsem);
1693 return res;
1694 }
1695
1696 /*
1697 * hw configurator
1698 */
1699 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1700 struct snd_pcm_hw_rule *rule)
1701 {
1702 struct snd_interval t;
1703 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1704 hw_param_interval_c(params, rule->deps[1]), &t);
1705 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1706 }
1707
1708 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1709 struct snd_pcm_hw_rule *rule)
1710 {
1711 struct snd_interval t;
1712 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1713 hw_param_interval_c(params, rule->deps[1]), &t);
1714 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1715 }
1716
1717 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1718 struct snd_pcm_hw_rule *rule)
1719 {
1720 struct snd_interval t;
1721 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1722 hw_param_interval_c(params, rule->deps[1]),
1723 (unsigned long) rule->private, &t);
1724 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1725 }
1726
1727 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1728 struct snd_pcm_hw_rule *rule)
1729 {
1730 struct snd_interval t;
1731 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1732 (unsigned long) rule->private,
1733 hw_param_interval_c(params, rule->deps[1]), &t);
1734 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1735 }
1736
1737 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1738 struct snd_pcm_hw_rule *rule)
1739 {
1740 unsigned int k;
1741 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1742 struct snd_mask m;
1743 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1744 snd_mask_any(&m);
1745 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1746 int bits;
1747 if (! snd_mask_test(mask, k))
1748 continue;
1749 bits = snd_pcm_format_physical_width(k);
1750 if (bits <= 0)
1751 continue; /* ignore invalid formats */
1752 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1753 snd_mask_reset(&m, k);
1754 }
1755 return snd_mask_refine(mask, &m);
1756 }
1757
1758 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1759 struct snd_pcm_hw_rule *rule)
1760 {
1761 struct snd_interval t;
1762 unsigned int k;
1763 t.min = UINT_MAX;
1764 t.max = 0;
1765 t.openmin = 0;
1766 t.openmax = 0;
1767 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1768 int bits;
1769 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1770 continue;
1771 bits = snd_pcm_format_physical_width(k);
1772 if (bits <= 0)
1773 continue; /* ignore invalid formats */
1774 if (t.min > (unsigned)bits)
1775 t.min = bits;
1776 if (t.max < (unsigned)bits)
1777 t.max = bits;
1778 }
1779 t.integer = 1;
1780 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1781 }
1782
1783 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1784 #error "Change this table"
1785 #endif
1786
1787 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1788 48000, 64000, 88200, 96000, 176400, 192000 };
1789
1790 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1791 .count = ARRAY_SIZE(rates),
1792 .list = rates,
1793 };
1794
1795 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1796 struct snd_pcm_hw_rule *rule)
1797 {
1798 struct snd_pcm_hardware *hw = rule->private;
1799 return snd_interval_list(hw_param_interval(params, rule->var),
1800 snd_pcm_known_rates.count,
1801 snd_pcm_known_rates.list, hw->rates);
1802 }
1803
1804 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1805 struct snd_pcm_hw_rule *rule)
1806 {
1807 struct snd_interval t;
1808 struct snd_pcm_substream *substream = rule->private;
1809 t.min = 0;
1810 t.max = substream->buffer_bytes_max;
1811 t.openmin = 0;
1812 t.openmax = 0;
1813 t.integer = 1;
1814 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1815 }
1816
1817 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1818 {
1819 struct snd_pcm_runtime *runtime = substream->runtime;
1820 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1821 int k, err;
1822
1823 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1824 snd_mask_any(constrs_mask(constrs, k));
1825 }
1826
1827 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1828 snd_interval_any(constrs_interval(constrs, k));
1829 }
1830
1831 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1832 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1833 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1834 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1835 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1836
1837 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1838 snd_pcm_hw_rule_format, NULL,
1839 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1840 if (err < 0)
1841 return err;
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1843 snd_pcm_hw_rule_sample_bits, NULL,
1844 SNDRV_PCM_HW_PARAM_FORMAT,
1845 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1846 if (err < 0)
1847 return err;
1848 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1849 snd_pcm_hw_rule_div, NULL,
1850 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1851 if (err < 0)
1852 return err;
1853 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1854 snd_pcm_hw_rule_mul, NULL,
1855 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1856 if (err < 0)
1857 return err;
1858 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1859 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1860 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1861 if (err < 0)
1862 return err;
1863 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1864 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1866 if (err < 0)
1867 return err;
1868 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1869 snd_pcm_hw_rule_div, NULL,
1870 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1871 if (err < 0)
1872 return err;
1873 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1874 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1875 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1876 if (err < 0)
1877 return err;
1878 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1879 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1880 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1881 if (err < 0)
1882 return err;
1883 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1884 snd_pcm_hw_rule_div, NULL,
1885 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1886 if (err < 0)
1887 return err;
1888 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1889 snd_pcm_hw_rule_div, NULL,
1890 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1891 if (err < 0)
1892 return err;
1893 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1894 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1895 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1896 if (err < 0)
1897 return err;
1898 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1899 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1900 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1901 if (err < 0)
1902 return err;
1903 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1904 snd_pcm_hw_rule_mul, NULL,
1905 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1906 if (err < 0)
1907 return err;
1908 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1909 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1910 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1911 if (err < 0)
1912 return err;
1913 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1914 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1915 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1916 if (err < 0)
1917 return err;
1918 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1919 snd_pcm_hw_rule_muldivk, (void*) 8,
1920 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1921 if (err < 0)
1922 return err;
1923 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1924 snd_pcm_hw_rule_muldivk, (void*) 8,
1925 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1926 if (err < 0)
1927 return err;
1928 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1929 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1930 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1931 if (err < 0)
1932 return err;
1933 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1934 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1935 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1936 if (err < 0)
1937 return err;
1938 return 0;
1939 }
1940
1941 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1942 {
1943 struct snd_pcm_runtime *runtime = substream->runtime;
1944 struct snd_pcm_hardware *hw = &runtime->hw;
1945 int err;
1946 unsigned int mask = 0;
1947
1948 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1949 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1950 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1951 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1952 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1953 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1954 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1955 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1956 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1957 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1958 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1959 }
1960 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1961 if (err < 0)
1962 return err;
1963
1964 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1965 if (err < 0)
1966 return err;
1967
1968 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1969 if (err < 0)
1970 return err;
1971
1972 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1973 hw->channels_min, hw->channels_max);
1974 if (err < 0)
1975 return err;
1976
1977 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1978 hw->rate_min, hw->rate_max);
1979 if (err < 0)
1980 return err;
1981
1982 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1983 hw->period_bytes_min, hw->period_bytes_max);
1984 if (err < 0)
1985 return err;
1986
1987 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1988 hw->periods_min, hw->periods_max);
1989 if (err < 0)
1990 return err;
1991
1992 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1993 hw->period_bytes_min, hw->buffer_bytes_max);
1994 if (err < 0)
1995 return err;
1996
1997 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1998 snd_pcm_hw_rule_buffer_bytes_max, substream,
1999 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2000 if (err < 0)
2001 return err;
2002
2003 /* FIXME: remove */
2004 if (runtime->dma_bytes) {
2005 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2006 if (err < 0)
2007 return err;
2008 }
2009
2010 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2011 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2012 snd_pcm_hw_rule_rate, hw,
2013 SNDRV_PCM_HW_PARAM_RATE, -1);
2014 if (err < 0)
2015 return err;
2016 }
2017
2018 /* FIXME: this belong to lowlevel */
2019 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2020
2021 return 0;
2022 }
2023
2024 static void pcm_release_private(struct snd_pcm_substream *substream)
2025 {
2026 snd_pcm_unlink(substream);
2027 }
2028
2029 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2030 {
2031 substream->ref_count--;
2032 if (substream->ref_count > 0)
2033 return;
2034
2035 snd_pcm_drop(substream);
2036 if (substream->hw_opened) {
2037 if (substream->ops->hw_free != NULL)
2038 substream->ops->hw_free(substream);
2039 substream->ops->close(substream);
2040 substream->hw_opened = 0;
2041 }
2042 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2043 pm_qos_remove_request(&substream->latency_pm_qos_req);
2044 if (substream->pcm_release) {
2045 substream->pcm_release(substream);
2046 substream->pcm_release = NULL;
2047 }
2048 snd_pcm_detach_substream(substream);
2049 }
2050
2051 EXPORT_SYMBOL(snd_pcm_release_substream);
2052
2053 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2054 struct file *file,
2055 struct snd_pcm_substream **rsubstream)
2056 {
2057 struct snd_pcm_substream *substream;
2058 int err;
2059
2060 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2061 if (err < 0)
2062 return err;
2063 if (substream->ref_count > 1) {
2064 *rsubstream = substream;
2065 return 0;
2066 }
2067
2068 err = snd_pcm_hw_constraints_init(substream);
2069 if (err < 0) {
2070 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2071 goto error;
2072 }
2073
2074 if ((err = substream->ops->open(substream)) < 0)
2075 goto error;
2076
2077 substream->hw_opened = 1;
2078
2079 err = snd_pcm_hw_constraints_complete(substream);
2080 if (err < 0) {
2081 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2082 goto error;
2083 }
2084
2085 *rsubstream = substream;
2086 return 0;
2087
2088 error:
2089 snd_pcm_release_substream(substream);
2090 return err;
2091 }
2092
2093 EXPORT_SYMBOL(snd_pcm_open_substream);
2094
2095 static int snd_pcm_open_file(struct file *file,
2096 struct snd_pcm *pcm,
2097 int stream)
2098 {
2099 struct snd_pcm_file *pcm_file;
2100 struct snd_pcm_substream *substream;
2101 int err;
2102
2103 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2104 if (err < 0)
2105 return err;
2106
2107 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2108 if (pcm_file == NULL) {
2109 snd_pcm_release_substream(substream);
2110 return -ENOMEM;
2111 }
2112 pcm_file->substream = substream;
2113 if (substream->ref_count == 1) {
2114 substream->file = pcm_file;
2115 substream->pcm_release = pcm_release_private;
2116 }
2117 file->private_data = pcm_file;
2118
2119 return 0;
2120 }
2121
2122 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2123 {
2124 struct snd_pcm *pcm;
2125 int err = nonseekable_open(inode, file);
2126 if (err < 0)
2127 return err;
2128 pcm = snd_lookup_minor_data(iminor(inode),
2129 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2130 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2131 if (pcm)
2132 snd_card_unref(pcm->card);
2133 return err;
2134 }
2135
2136 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2137 {
2138 struct snd_pcm *pcm;
2139 int err = nonseekable_open(inode, file);
2140 if (err < 0)
2141 return err;
2142 pcm = snd_lookup_minor_data(iminor(inode),
2143 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2144 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2145 if (pcm)
2146 snd_card_unref(pcm->card);
2147 return err;
2148 }
2149
2150 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2151 {
2152 int err;
2153 wait_queue_t wait;
2154
2155 if (pcm == NULL) {
2156 err = -ENODEV;
2157 goto __error1;
2158 }
2159 err = snd_card_file_add(pcm->card, file);
2160 if (err < 0)
2161 goto __error1;
2162 if (!try_module_get(pcm->card->module)) {
2163 err = -EFAULT;
2164 goto __error2;
2165 }
2166 init_waitqueue_entry(&wait, current);
2167 add_wait_queue(&pcm->open_wait, &wait);
2168 mutex_lock(&pcm->open_mutex);
2169 while (1) {
2170 err = snd_pcm_open_file(file, pcm, stream);
2171 if (err >= 0)
2172 break;
2173 if (err == -EAGAIN) {
2174 if (file->f_flags & O_NONBLOCK) {
2175 err = -EBUSY;
2176 break;
2177 }
2178 } else
2179 break;
2180 set_current_state(TASK_INTERRUPTIBLE);
2181 mutex_unlock(&pcm->open_mutex);
2182 schedule();
2183 mutex_lock(&pcm->open_mutex);
2184 if (pcm->card->shutdown) {
2185 err = -ENODEV;
2186 break;
2187 }
2188 if (signal_pending(current)) {
2189 err = -ERESTARTSYS;
2190 break;
2191 }
2192 }
2193 remove_wait_queue(&pcm->open_wait, &wait);
2194 mutex_unlock(&pcm->open_mutex);
2195 if (err < 0)
2196 goto __error;
2197 return err;
2198
2199 __error:
2200 module_put(pcm->card->module);
2201 __error2:
2202 snd_card_file_remove(pcm->card, file);
2203 __error1:
2204 return err;
2205 }
2206
2207 static int snd_pcm_release(struct inode *inode, struct file *file)
2208 {
2209 struct snd_pcm *pcm;
2210 struct snd_pcm_substream *substream;
2211 struct snd_pcm_file *pcm_file;
2212
2213 pcm_file = file->private_data;
2214 substream = pcm_file->substream;
2215 if (snd_BUG_ON(!substream))
2216 return -ENXIO;
2217 pcm = substream->pcm;
2218 mutex_lock(&pcm->open_mutex);
2219 snd_pcm_release_substream(substream);
2220 kfree(pcm_file);
2221 mutex_unlock(&pcm->open_mutex);
2222 wake_up(&pcm->open_wait);
2223 module_put(pcm->card->module);
2224 snd_card_file_remove(pcm->card, file);
2225 return 0;
2226 }
2227
2228 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2229 snd_pcm_uframes_t frames)
2230 {
2231 struct snd_pcm_runtime *runtime = substream->runtime;
2232 snd_pcm_sframes_t appl_ptr;
2233 snd_pcm_sframes_t ret;
2234 snd_pcm_sframes_t hw_avail;
2235
2236 if (frames == 0)
2237 return 0;
2238
2239 snd_pcm_stream_lock_irq(substream);
2240 switch (runtime->status->state) {
2241 case SNDRV_PCM_STATE_PREPARED:
2242 break;
2243 case SNDRV_PCM_STATE_DRAINING:
2244 case SNDRV_PCM_STATE_RUNNING:
2245 if (snd_pcm_update_hw_ptr(substream) >= 0)
2246 break;
2247 /* Fall through */
2248 case SNDRV_PCM_STATE_XRUN:
2249 ret = -EPIPE;
2250 goto __end;
2251 case SNDRV_PCM_STATE_SUSPENDED:
2252 ret = -ESTRPIPE;
2253 goto __end;
2254 default:
2255 ret = -EBADFD;
2256 goto __end;
2257 }
2258
2259 hw_avail = snd_pcm_playback_hw_avail(runtime);
2260 if (hw_avail <= 0) {
2261 ret = 0;
2262 goto __end;
2263 }
2264 if (frames > (snd_pcm_uframes_t)hw_avail)
2265 frames = hw_avail;
2266 appl_ptr = runtime->control->appl_ptr - frames;
2267 if (appl_ptr < 0)
2268 appl_ptr += runtime->boundary;
2269 runtime->control->appl_ptr = appl_ptr;
2270 ret = frames;
2271 __end:
2272 snd_pcm_stream_unlock_irq(substream);
2273 return ret;
2274 }
2275
2276 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2277 snd_pcm_uframes_t frames)
2278 {
2279 struct snd_pcm_runtime *runtime = substream->runtime;
2280 snd_pcm_sframes_t appl_ptr;
2281 snd_pcm_sframes_t ret;
2282 snd_pcm_sframes_t hw_avail;
2283
2284 if (frames == 0)
2285 return 0;
2286
2287 snd_pcm_stream_lock_irq(substream);
2288 switch (runtime->status->state) {
2289 case SNDRV_PCM_STATE_PREPARED:
2290 case SNDRV_PCM_STATE_DRAINING:
2291 break;
2292 case SNDRV_PCM_STATE_RUNNING:
2293 if (snd_pcm_update_hw_ptr(substream) >= 0)
2294 break;
2295 /* Fall through */
2296 case SNDRV_PCM_STATE_XRUN:
2297 ret = -EPIPE;
2298 goto __end;
2299 case SNDRV_PCM_STATE_SUSPENDED:
2300 ret = -ESTRPIPE;
2301 goto __end;
2302 default:
2303 ret = -EBADFD;
2304 goto __end;
2305 }
2306
2307 hw_avail = snd_pcm_capture_hw_avail(runtime);
2308 if (hw_avail <= 0) {
2309 ret = 0;
2310 goto __end;
2311 }
2312 if (frames > (snd_pcm_uframes_t)hw_avail)
2313 frames = hw_avail;
2314 appl_ptr = runtime->control->appl_ptr - frames;
2315 if (appl_ptr < 0)
2316 appl_ptr += runtime->boundary;
2317 runtime->control->appl_ptr = appl_ptr;
2318 ret = frames;
2319 __end:
2320 snd_pcm_stream_unlock_irq(substream);
2321 return ret;
2322 }
2323
2324 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2325 snd_pcm_uframes_t frames)
2326 {
2327 struct snd_pcm_runtime *runtime = substream->runtime;
2328 snd_pcm_sframes_t appl_ptr;
2329 snd_pcm_sframes_t ret;
2330 snd_pcm_sframes_t avail;
2331
2332 if (frames == 0)
2333 return 0;
2334
2335 snd_pcm_stream_lock_irq(substream);
2336 switch (runtime->status->state) {
2337 case SNDRV_PCM_STATE_PREPARED:
2338 case SNDRV_PCM_STATE_PAUSED:
2339 break;
2340 case SNDRV_PCM_STATE_DRAINING:
2341 case SNDRV_PCM_STATE_RUNNING:
2342 if (snd_pcm_update_hw_ptr(substream) >= 0)
2343 break;
2344 /* Fall through */
2345 case SNDRV_PCM_STATE_XRUN:
2346 ret = -EPIPE;
2347 goto __end;
2348 case SNDRV_PCM_STATE_SUSPENDED:
2349 ret = -ESTRPIPE;
2350 goto __end;
2351 default:
2352 ret = -EBADFD;
2353 goto __end;
2354 }
2355
2356 avail = snd_pcm_playback_avail(runtime);
2357 if (avail <= 0) {
2358 ret = 0;
2359 goto __end;
2360 }
2361 if (frames > (snd_pcm_uframes_t)avail)
2362 frames = avail;
2363 appl_ptr = runtime->control->appl_ptr + frames;
2364 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2365 appl_ptr -= runtime->boundary;
2366 runtime->control->appl_ptr = appl_ptr;
2367 ret = frames;
2368 __end:
2369 snd_pcm_stream_unlock_irq(substream);
2370 return ret;
2371 }
2372
2373 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2374 snd_pcm_uframes_t frames)
2375 {
2376 struct snd_pcm_runtime *runtime = substream->runtime;
2377 snd_pcm_sframes_t appl_ptr;
2378 snd_pcm_sframes_t ret;
2379 snd_pcm_sframes_t avail;
2380
2381 if (frames == 0)
2382 return 0;
2383
2384 snd_pcm_stream_lock_irq(substream);
2385 switch (runtime->status->state) {
2386 case SNDRV_PCM_STATE_PREPARED:
2387 case SNDRV_PCM_STATE_DRAINING:
2388 case SNDRV_PCM_STATE_PAUSED:
2389 break;
2390 case SNDRV_PCM_STATE_RUNNING:
2391 if (snd_pcm_update_hw_ptr(substream) >= 0)
2392 break;
2393 /* Fall through */
2394 case SNDRV_PCM_STATE_XRUN:
2395 ret = -EPIPE;
2396 goto __end;
2397 case SNDRV_PCM_STATE_SUSPENDED:
2398 ret = -ESTRPIPE;
2399 goto __end;
2400 default:
2401 ret = -EBADFD;
2402 goto __end;
2403 }
2404
2405 avail = snd_pcm_capture_avail(runtime);
2406 if (avail <= 0) {
2407 ret = 0;
2408 goto __end;
2409 }
2410 if (frames > (snd_pcm_uframes_t)avail)
2411 frames = avail;
2412 appl_ptr = runtime->control->appl_ptr + frames;
2413 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2414 appl_ptr -= runtime->boundary;
2415 runtime->control->appl_ptr = appl_ptr;
2416 ret = frames;
2417 __end:
2418 snd_pcm_stream_unlock_irq(substream);
2419 return ret;
2420 }
2421
2422 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2423 {
2424 struct snd_pcm_runtime *runtime = substream->runtime;
2425 int err;
2426
2427 snd_pcm_stream_lock_irq(substream);
2428 switch (runtime->status->state) {
2429 case SNDRV_PCM_STATE_DRAINING:
2430 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2431 goto __badfd;
2432 /* Fall through */
2433 case SNDRV_PCM_STATE_RUNNING:
2434 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2435 break;
2436 /* Fall through */
2437 case SNDRV_PCM_STATE_PREPARED:
2438 case SNDRV_PCM_STATE_SUSPENDED:
2439 err = 0;
2440 break;
2441 case SNDRV_PCM_STATE_XRUN:
2442 err = -EPIPE;
2443 break;
2444 default:
2445 __badfd:
2446 err = -EBADFD;
2447 break;
2448 }
2449 snd_pcm_stream_unlock_irq(substream);
2450 return err;
2451 }
2452
2453 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2454 snd_pcm_sframes_t __user *res)
2455 {
2456 struct snd_pcm_runtime *runtime = substream->runtime;
2457 int err;
2458 snd_pcm_sframes_t n = 0;
2459
2460 snd_pcm_stream_lock_irq(substream);
2461 switch (runtime->status->state) {
2462 case SNDRV_PCM_STATE_DRAINING:
2463 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2464 goto __badfd;
2465 /* Fall through */
2466 case SNDRV_PCM_STATE_RUNNING:
2467 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2468 break;
2469 /* Fall through */
2470 case SNDRV_PCM_STATE_PREPARED:
2471 case SNDRV_PCM_STATE_SUSPENDED:
2472 err = 0;
2473 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2474 n = snd_pcm_playback_hw_avail(runtime);
2475 else
2476 n = snd_pcm_capture_avail(runtime);
2477 n += runtime->delay;
2478 break;
2479 case SNDRV_PCM_STATE_XRUN:
2480 err = -EPIPE;
2481 break;
2482 default:
2483 __badfd:
2484 err = -EBADFD;
2485 break;
2486 }
2487 snd_pcm_stream_unlock_irq(substream);
2488 if (!err)
2489 if (put_user(n, res))
2490 err = -EFAULT;
2491 return err;
2492 }
2493
2494 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2495 struct snd_pcm_sync_ptr __user *_sync_ptr)
2496 {
2497 struct snd_pcm_runtime *runtime = substream->runtime;
2498 struct snd_pcm_sync_ptr sync_ptr;
2499 volatile struct snd_pcm_mmap_status *status;
2500 volatile struct snd_pcm_mmap_control *control;
2501 int err;
2502
2503 memset(&sync_ptr, 0, sizeof(sync_ptr));
2504 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2505 return -EFAULT;
2506 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2507 return -EFAULT;
2508 status = runtime->status;
2509 control = runtime->control;
2510 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2511 err = snd_pcm_hwsync(substream);
2512 if (err < 0)
2513 return err;
2514 }
2515 snd_pcm_stream_lock_irq(substream);
2516 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2517 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2518 else
2519 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2520 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2521 control->avail_min = sync_ptr.c.control.avail_min;
2522 else
2523 sync_ptr.c.control.avail_min = control->avail_min;
2524 sync_ptr.s.status.state = status->state;
2525 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2526 sync_ptr.s.status.tstamp = status->tstamp;
2527 sync_ptr.s.status.suspended_state = status->suspended_state;
2528 snd_pcm_stream_unlock_irq(substream);
2529 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2530 return -EFAULT;
2531 return 0;
2532 }
2533
2534 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2535 {
2536 struct snd_pcm_runtime *runtime = substream->runtime;
2537 int arg;
2538
2539 if (get_user(arg, _arg))
2540 return -EFAULT;
2541 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2542 return -EINVAL;
2543 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2544 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2545 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2546 return 0;
2547 }
2548
2549 static int snd_pcm_common_ioctl1(struct file *file,
2550 struct snd_pcm_substream *substream,
2551 unsigned int cmd, void __user *arg)
2552 {
2553 switch (cmd) {
2554 case SNDRV_PCM_IOCTL_PVERSION:
2555 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2556 case SNDRV_PCM_IOCTL_INFO:
2557 return snd_pcm_info_user(substream, arg);
2558 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2559 return 0;
2560 case SNDRV_PCM_IOCTL_TTSTAMP:
2561 return snd_pcm_tstamp(substream, arg);
2562 case SNDRV_PCM_IOCTL_HW_REFINE:
2563 return snd_pcm_hw_refine_user(substream, arg);
2564 case SNDRV_PCM_IOCTL_HW_PARAMS:
2565 return snd_pcm_hw_params_user(substream, arg);
2566 case SNDRV_PCM_IOCTL_HW_FREE:
2567 return snd_pcm_hw_free(substream);
2568 case SNDRV_PCM_IOCTL_SW_PARAMS:
2569 return snd_pcm_sw_params_user(substream, arg);
2570 case SNDRV_PCM_IOCTL_STATUS:
2571 return snd_pcm_status_user(substream, arg);
2572 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2573 return snd_pcm_channel_info_user(substream, arg);
2574 case SNDRV_PCM_IOCTL_PREPARE:
2575 return snd_pcm_prepare(substream, file);
2576 case SNDRV_PCM_IOCTL_RESET:
2577 return snd_pcm_reset(substream);
2578 case SNDRV_PCM_IOCTL_START:
2579 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2580 case SNDRV_PCM_IOCTL_LINK:
2581 return snd_pcm_link(substream, (int)(unsigned long) arg);
2582 case SNDRV_PCM_IOCTL_UNLINK:
2583 return snd_pcm_unlink(substream);
2584 case SNDRV_PCM_IOCTL_RESUME:
2585 return snd_pcm_resume(substream);
2586 case SNDRV_PCM_IOCTL_XRUN:
2587 return snd_pcm_xrun(substream);
2588 case SNDRV_PCM_IOCTL_HWSYNC:
2589 return snd_pcm_hwsync(substream);
2590 case SNDRV_PCM_IOCTL_DELAY:
2591 return snd_pcm_delay(substream, arg);
2592 case SNDRV_PCM_IOCTL_SYNC_PTR:
2593 return snd_pcm_sync_ptr(substream, arg);
2594 #ifdef CONFIG_SND_SUPPORT_OLD_API
2595 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2596 return snd_pcm_hw_refine_old_user(substream, arg);
2597 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2598 return snd_pcm_hw_params_old_user(substream, arg);
2599 #endif
2600 case SNDRV_PCM_IOCTL_DRAIN:
2601 return snd_pcm_drain(substream, file);
2602 case SNDRV_PCM_IOCTL_DROP:
2603 return snd_pcm_drop(substream);
2604 case SNDRV_PCM_IOCTL_PAUSE:
2605 {
2606 int res;
2607 snd_pcm_stream_lock_irq(substream);
2608 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2609 snd_pcm_stream_unlock_irq(substream);
2610 return res;
2611 }
2612 }
2613 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2614 return -ENOTTY;
2615 }
2616
2617 static int snd_pcm_playback_ioctl1(struct file *file,
2618 struct snd_pcm_substream *substream,
2619 unsigned int cmd, void __user *arg)
2620 {
2621 if (snd_BUG_ON(!substream))
2622 return -ENXIO;
2623 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2624 return -EINVAL;
2625 switch (cmd) {
2626 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2627 {
2628 struct snd_xferi xferi;
2629 struct snd_xferi __user *_xferi = arg;
2630 struct snd_pcm_runtime *runtime = substream->runtime;
2631 snd_pcm_sframes_t result;
2632 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2633 return -EBADFD;
2634 if (put_user(0, &_xferi->result))
2635 return -EFAULT;
2636 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2637 return -EFAULT;
2638 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2639 __put_user(result, &_xferi->result);
2640 return result < 0 ? result : 0;
2641 }
2642 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2643 {
2644 struct snd_xfern xfern;
2645 struct snd_xfern __user *_xfern = arg;
2646 struct snd_pcm_runtime *runtime = substream->runtime;
2647 void __user **bufs;
2648 snd_pcm_sframes_t result;
2649 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2650 return -EBADFD;
2651 if (runtime->channels > 128)
2652 return -EINVAL;
2653 if (put_user(0, &_xfern->result))
2654 return -EFAULT;
2655 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2656 return -EFAULT;
2657
2658 bufs = memdup_user(xfern.bufs,
2659 sizeof(void *) * runtime->channels);
2660 if (IS_ERR(bufs))
2661 return PTR_ERR(bufs);
2662 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2663 kfree(bufs);
2664 __put_user(result, &_xfern->result);
2665 return result < 0 ? result : 0;
2666 }
2667 case SNDRV_PCM_IOCTL_REWIND:
2668 {
2669 snd_pcm_uframes_t frames;
2670 snd_pcm_uframes_t __user *_frames = arg;
2671 snd_pcm_sframes_t result;
2672 if (get_user(frames, _frames))
2673 return -EFAULT;
2674 if (put_user(0, _frames))
2675 return -EFAULT;
2676 result = snd_pcm_playback_rewind(substream, frames);
2677 __put_user(result, _frames);
2678 return result < 0 ? result : 0;
2679 }
2680 case SNDRV_PCM_IOCTL_FORWARD:
2681 {
2682 snd_pcm_uframes_t frames;
2683 snd_pcm_uframes_t __user *_frames = arg;
2684 snd_pcm_sframes_t result;
2685 if (get_user(frames, _frames))
2686 return -EFAULT;
2687 if (put_user(0, _frames))
2688 return -EFAULT;
2689 result = snd_pcm_playback_forward(substream, frames);
2690 __put_user(result, _frames);
2691 return result < 0 ? result : 0;
2692 }
2693 }
2694 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2695 }
2696
2697 static int snd_pcm_capture_ioctl1(struct file *file,
2698 struct snd_pcm_substream *substream,
2699 unsigned int cmd, void __user *arg)
2700 {
2701 if (snd_BUG_ON(!substream))
2702 return -ENXIO;
2703 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2704 return -EINVAL;
2705 switch (cmd) {
2706 case SNDRV_PCM_IOCTL_READI_FRAMES:
2707 {
2708 struct snd_xferi xferi;
2709 struct snd_xferi __user *_xferi = arg;
2710 struct snd_pcm_runtime *runtime = substream->runtime;
2711 snd_pcm_sframes_t result;
2712 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2713 return -EBADFD;
2714 if (put_user(0, &_xferi->result))
2715 return -EFAULT;
2716 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2717 return -EFAULT;
2718 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2719 __put_user(result, &_xferi->result);
2720 return result < 0 ? result : 0;
2721 }
2722 case SNDRV_PCM_IOCTL_READN_FRAMES:
2723 {
2724 struct snd_xfern xfern;
2725 struct snd_xfern __user *_xfern = arg;
2726 struct snd_pcm_runtime *runtime = substream->runtime;
2727 void *bufs;
2728 snd_pcm_sframes_t result;
2729 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2730 return -EBADFD;
2731 if (runtime->channels > 128)
2732 return -EINVAL;
2733 if (put_user(0, &_xfern->result))
2734 return -EFAULT;
2735 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2736 return -EFAULT;
2737
2738 bufs = memdup_user(xfern.bufs,
2739 sizeof(void *) * runtime->channels);
2740 if (IS_ERR(bufs))
2741 return PTR_ERR(bufs);
2742 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2743 kfree(bufs);
2744 __put_user(result, &_xfern->result);
2745 return result < 0 ? result : 0;
2746 }
2747 case SNDRV_PCM_IOCTL_REWIND:
2748 {
2749 snd_pcm_uframes_t frames;
2750 snd_pcm_uframes_t __user *_frames = arg;
2751 snd_pcm_sframes_t result;
2752 if (get_user(frames, _frames))
2753 return -EFAULT;
2754 if (put_user(0, _frames))
2755 return -EFAULT;
2756 result = snd_pcm_capture_rewind(substream, frames);
2757 __put_user(result, _frames);
2758 return result < 0 ? result : 0;
2759 }
2760 case SNDRV_PCM_IOCTL_FORWARD:
2761 {
2762 snd_pcm_uframes_t frames;
2763 snd_pcm_uframes_t __user *_frames = arg;
2764 snd_pcm_sframes_t result;
2765 if (get_user(frames, _frames))
2766 return -EFAULT;
2767 if (put_user(0, _frames))
2768 return -EFAULT;
2769 result = snd_pcm_capture_forward(substream, frames);
2770 __put_user(result, _frames);
2771 return result < 0 ? result : 0;
2772 }
2773 }
2774 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2775 }
2776
2777 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2778 unsigned long arg)
2779 {
2780 struct snd_pcm_file *pcm_file;
2781
2782 pcm_file = file->private_data;
2783
2784 if (((cmd >> 8) & 0xff) != 'A')
2785 return -ENOTTY;
2786
2787 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2788 (void __user *)arg);
2789 }
2790
2791 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2792 unsigned long arg)
2793 {
2794 struct snd_pcm_file *pcm_file;
2795
2796 pcm_file = file->private_data;
2797
2798 if (((cmd >> 8) & 0xff) != 'A')
2799 return -ENOTTY;
2800
2801 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2802 (void __user *)arg);
2803 }
2804
2805 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2806 unsigned int cmd, void *arg)
2807 {
2808 mm_segment_t fs;
2809 int result;
2810
2811 fs = snd_enter_user();
2812 switch (substream->stream) {
2813 case SNDRV_PCM_STREAM_PLAYBACK:
2814 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2815 (void __user *)arg);
2816 break;
2817 case SNDRV_PCM_STREAM_CAPTURE:
2818 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2819 (void __user *)arg);
2820 break;
2821 default:
2822 result = -EINVAL;
2823 break;
2824 }
2825 snd_leave_user(fs);
2826 return result;
2827 }
2828
2829 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2830
2831 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2832 loff_t * offset)
2833 {
2834 struct snd_pcm_file *pcm_file;
2835 struct snd_pcm_substream *substream;
2836 struct snd_pcm_runtime *runtime;
2837 snd_pcm_sframes_t result;
2838
2839 pcm_file = file->private_data;
2840 substream = pcm_file->substream;
2841 if (PCM_RUNTIME_CHECK(substream))
2842 return -ENXIO;
2843 runtime = substream->runtime;
2844 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2845 return -EBADFD;
2846 if (!frame_aligned(runtime, count))
2847 return -EINVAL;
2848 count = bytes_to_frames(runtime, count);
2849 result = snd_pcm_lib_read(substream, buf, count);
2850 if (result > 0)
2851 result = frames_to_bytes(runtime, result);
2852 return result;
2853 }
2854
2855 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2856 size_t count, loff_t * offset)
2857 {
2858 struct snd_pcm_file *pcm_file;
2859 struct snd_pcm_substream *substream;
2860 struct snd_pcm_runtime *runtime;
2861 snd_pcm_sframes_t result;
2862
2863 pcm_file = file->private_data;
2864 substream = pcm_file->substream;
2865 if (PCM_RUNTIME_CHECK(substream))
2866 return -ENXIO;
2867 runtime = substream->runtime;
2868 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2869 return -EBADFD;
2870 if (!frame_aligned(runtime, count))
2871 return -EINVAL;
2872 count = bytes_to_frames(runtime, count);
2873 result = snd_pcm_lib_write(substream, buf, count);
2874 if (result > 0)
2875 result = frames_to_bytes(runtime, result);
2876 return result;
2877 }
2878
2879 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2880 unsigned long nr_segs, loff_t pos)
2881
2882 {
2883 struct snd_pcm_file *pcm_file;
2884 struct snd_pcm_substream *substream;
2885 struct snd_pcm_runtime *runtime;
2886 snd_pcm_sframes_t result;
2887 unsigned long i;
2888 void __user **bufs;
2889 snd_pcm_uframes_t frames;
2890
2891 pcm_file = iocb->ki_filp->private_data;
2892 substream = pcm_file->substream;
2893 if (PCM_RUNTIME_CHECK(substream))
2894 return -ENXIO;
2895 runtime = substream->runtime;
2896 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2897 return -EBADFD;
2898 if (nr_segs > 1024 || nr_segs != runtime->channels)
2899 return -EINVAL;
2900 if (!frame_aligned(runtime, iov->iov_len))
2901 return -EINVAL;
2902 frames = bytes_to_samples(runtime, iov->iov_len);
2903 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2904 if (bufs == NULL)
2905 return -ENOMEM;
2906 for (i = 0; i < nr_segs; ++i)
2907 bufs[i] = iov[i].iov_base;
2908 result = snd_pcm_lib_readv(substream, bufs, frames);
2909 if (result > 0)
2910 result = frames_to_bytes(runtime, result);
2911 kfree(bufs);
2912 return result;
2913 }
2914
2915 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2916 unsigned long nr_segs, loff_t pos)
2917 {
2918 struct snd_pcm_file *pcm_file;
2919 struct snd_pcm_substream *substream;
2920 struct snd_pcm_runtime *runtime;
2921 snd_pcm_sframes_t result;
2922 unsigned long i;
2923 void __user **bufs;
2924 snd_pcm_uframes_t frames;
2925
2926 pcm_file = iocb->ki_filp->private_data;
2927 substream = pcm_file->substream;
2928 if (PCM_RUNTIME_CHECK(substream))
2929 return -ENXIO;
2930 runtime = substream->runtime;
2931 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2932 return -EBADFD;
2933 if (nr_segs > 128 || nr_segs != runtime->channels ||
2934 !frame_aligned(runtime, iov->iov_len))
2935 return -EINVAL;
2936 frames = bytes_to_samples(runtime, iov->iov_len);
2937 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2938 if (bufs == NULL)
2939 return -ENOMEM;
2940 for (i = 0; i < nr_segs; ++i)
2941 bufs[i] = iov[i].iov_base;
2942 result = snd_pcm_lib_writev(substream, bufs, frames);
2943 if (result > 0)
2944 result = frames_to_bytes(runtime, result);
2945 kfree(bufs);
2946 return result;
2947 }
2948
2949 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2950 {
2951 struct snd_pcm_file *pcm_file;
2952 struct snd_pcm_substream *substream;
2953 struct snd_pcm_runtime *runtime;
2954 unsigned int mask;
2955 snd_pcm_uframes_t avail;
2956
2957 pcm_file = file->private_data;
2958
2959 substream = pcm_file->substream;
2960 if (PCM_RUNTIME_CHECK(substream))
2961 return -ENXIO;
2962 runtime = substream->runtime;
2963
2964 poll_wait(file, &runtime->sleep, wait);
2965
2966 snd_pcm_stream_lock_irq(substream);
2967 avail = snd_pcm_playback_avail(runtime);
2968 switch (runtime->status->state) {
2969 case SNDRV_PCM_STATE_RUNNING:
2970 case SNDRV_PCM_STATE_PREPARED:
2971 case SNDRV_PCM_STATE_PAUSED:
2972 if (avail >= runtime->control->avail_min) {
2973 mask = POLLOUT | POLLWRNORM;
2974 break;
2975 }
2976 /* Fall through */
2977 case SNDRV_PCM_STATE_DRAINING:
2978 mask = 0;
2979 break;
2980 default:
2981 mask = POLLOUT | POLLWRNORM | POLLERR;
2982 break;
2983 }
2984 snd_pcm_stream_unlock_irq(substream);
2985 return mask;
2986 }
2987
2988 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2989 {
2990 struct snd_pcm_file *pcm_file;
2991 struct snd_pcm_substream *substream;
2992 struct snd_pcm_runtime *runtime;
2993 unsigned int mask;
2994 snd_pcm_uframes_t avail;
2995
2996 pcm_file = file->private_data;
2997
2998 substream = pcm_file->substream;
2999 if (PCM_RUNTIME_CHECK(substream))
3000 return -ENXIO;
3001 runtime = substream->runtime;
3002
3003 poll_wait(file, &runtime->sleep, wait);
3004
3005 snd_pcm_stream_lock_irq(substream);
3006 avail = snd_pcm_capture_avail(runtime);
3007 switch (runtime->status->state) {
3008 case SNDRV_PCM_STATE_RUNNING:
3009 case SNDRV_PCM_STATE_PREPARED:
3010 case SNDRV_PCM_STATE_PAUSED:
3011 if (avail >= runtime->control->avail_min) {
3012 mask = POLLIN | POLLRDNORM;
3013 break;
3014 }
3015 mask = 0;
3016 break;
3017 case SNDRV_PCM_STATE_DRAINING:
3018 if (avail > 0) {
3019 mask = POLLIN | POLLRDNORM;
3020 break;
3021 }
3022 /* Fall through */
3023 default:
3024 mask = POLLIN | POLLRDNORM | POLLERR;
3025 break;
3026 }
3027 snd_pcm_stream_unlock_irq(substream);
3028 return mask;
3029 }
3030
3031 /*
3032 * mmap support
3033 */
3034
3035 /*
3036 * Only on coherent architectures, we can mmap the status and the control records
3037 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3038 */
3039 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3040 /*
3041 * mmap status record
3042 */
3043 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3044 struct vm_fault *vmf)
3045 {
3046 struct snd_pcm_substream *substream = area->vm_private_data;
3047 struct snd_pcm_runtime *runtime;
3048
3049 if (substream == NULL)
3050 return VM_FAULT_SIGBUS;
3051 runtime = substream->runtime;
3052 vmf->page = virt_to_page(runtime->status);
3053 get_page(vmf->page);
3054 return 0;
3055 }
3056
3057 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3058 {
3059 .fault = snd_pcm_mmap_status_fault,
3060 };
3061
3062 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3063 struct vm_area_struct *area)
3064 {
3065 long size;
3066 if (!(area->vm_flags & VM_READ))
3067 return -EINVAL;
3068 size = area->vm_end - area->vm_start;
3069 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3070 return -EINVAL;
3071 area->vm_ops = &snd_pcm_vm_ops_status;
3072 area->vm_private_data = substream;
3073 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3074 return 0;
3075 }
3076
3077 /*
3078 * mmap control record
3079 */
3080 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3081 struct vm_fault *vmf)
3082 {
3083 struct snd_pcm_substream *substream = area->vm_private_data;
3084 struct snd_pcm_runtime *runtime;
3085
3086 if (substream == NULL)
3087 return VM_FAULT_SIGBUS;
3088 runtime = substream->runtime;
3089 vmf->page = virt_to_page(runtime->control);
3090 get_page(vmf->page);
3091 return 0;
3092 }
3093
3094 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3095 {
3096 .fault = snd_pcm_mmap_control_fault,
3097 };
3098
3099 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3100 struct vm_area_struct *area)
3101 {
3102 long size;
3103 if (!(area->vm_flags & VM_READ))
3104 return -EINVAL;
3105 size = area->vm_end - area->vm_start;
3106 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3107 return -EINVAL;
3108 area->vm_ops = &snd_pcm_vm_ops_control;
3109 area->vm_private_data = substream;
3110 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3111 return 0;
3112 }
3113 #else /* ! coherent mmap */
3114 /*
3115 * don't support mmap for status and control records.
3116 */
3117 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3118 struct vm_area_struct *area)
3119 {
3120 return -ENXIO;
3121 }
3122 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3123 struct vm_area_struct *area)
3124 {
3125 return -ENXIO;
3126 }
3127 #endif /* coherent mmap */
3128
3129 static inline struct page *
3130 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3131 {
3132 void *vaddr = substream->runtime->dma_area + ofs;
3133 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3134 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3135 return virt_to_page(CAC_ADDR(vaddr));
3136 #endif
3137 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3138 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3139 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3140 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3141 /* assume dma_handle set via pfn_to_phys() in
3142 * mm/dma-noncoherent.c
3143 */
3144 return pfn_to_page(addr >> PAGE_SHIFT);
3145 }
3146 #endif
3147 return virt_to_page(vaddr);
3148 }
3149
3150 /*
3151 * fault callback for mmapping a RAM page
3152 */
3153 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3154 struct vm_fault *vmf)
3155 {
3156 struct snd_pcm_substream *substream = area->vm_private_data;
3157 struct snd_pcm_runtime *runtime;
3158 unsigned long offset;
3159 struct page * page;
3160 size_t dma_bytes;
3161
3162 if (substream == NULL)
3163 return VM_FAULT_SIGBUS;
3164 runtime = substream->runtime;
3165 offset = vmf->pgoff << PAGE_SHIFT;
3166 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3167 if (offset > dma_bytes - PAGE_SIZE)
3168 return VM_FAULT_SIGBUS;
3169 if (substream->ops->page)
3170 page = substream->ops->page(substream, offset);
3171 else
3172 page = snd_pcm_default_page_ops(substream, offset);
3173 if (!page)
3174 return VM_FAULT_SIGBUS;
3175 get_page(page);
3176 vmf->page = page;
3177 return 0;
3178 }
3179
3180 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3181 .open = snd_pcm_mmap_data_open,
3182 .close = snd_pcm_mmap_data_close,
3183 };
3184
3185 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3186 .open = snd_pcm_mmap_data_open,
3187 .close = snd_pcm_mmap_data_close,
3188 .fault = snd_pcm_mmap_data_fault,
3189 };
3190
3191 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3192 /* This should be defined / handled globally! */
3193 #ifdef CONFIG_ARM
3194 #define ARCH_HAS_DMA_MMAP_COHERENT
3195 #endif
3196 #endif
3197
3198 /*
3199 * mmap the DMA buffer on RAM
3200 */
3201 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3202 struct vm_area_struct *area)
3203 {
3204 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3205 #ifdef CONFIG_GENERIC_ALLOCATOR
3206 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3207 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3208 return remap_pfn_range(area, area->vm_start,
3209 substream->dma_buffer.addr >> PAGE_SHIFT,
3210 area->vm_end - area->vm_start, area->vm_page_prot);
3211 }
3212 #endif /* CONFIG_GENERIC_ALLOCATOR */
3213 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3214 if (!substream->ops->page &&
3215 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3216 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3217 area,
3218 substream->runtime->dma_area,
3219 substream->runtime->dma_addr,
3220 area->vm_end - area->vm_start);
3221 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3222 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3223 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3224 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3225 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3226 /* mmap with fault handler */
3227 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3228 return 0;
3229 }
3230 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3231
3232 /*
3233 * mmap the DMA buffer on I/O memory area
3234 */
3235 #if SNDRV_PCM_INFO_MMAP_IOMEM
3236 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3237 struct vm_area_struct *area)
3238 {
3239 struct snd_pcm_runtime *runtime = substream->runtime;;
3240
3241 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3242 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3243 }
3244
3245 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3246 #endif /* SNDRV_PCM_INFO_MMAP */
3247
3248 /*
3249 * mmap DMA buffer
3250 */
3251 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3252 struct vm_area_struct *area)
3253 {
3254 struct snd_pcm_runtime *runtime;
3255 long size;
3256 unsigned long offset;
3257 size_t dma_bytes;
3258 int err;
3259
3260 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3261 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3262 return -EINVAL;
3263 } else {
3264 if (!(area->vm_flags & VM_READ))
3265 return -EINVAL;
3266 }
3267 runtime = substream->runtime;
3268 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3269 return -EBADFD;
3270 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3271 return -ENXIO;
3272 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3273 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3274 return -EINVAL;
3275 size = area->vm_end - area->vm_start;
3276 offset = area->vm_pgoff << PAGE_SHIFT;
3277 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3278 if ((size_t)size > dma_bytes)
3279 return -EINVAL;
3280 if (offset > dma_bytes - size)
3281 return -EINVAL;
3282
3283 area->vm_ops = &snd_pcm_vm_ops_data;
3284 area->vm_private_data = substream;
3285 if (substream->ops->mmap)
3286 err = substream->ops->mmap(substream, area);
3287 else
3288 err = snd_pcm_lib_default_mmap(substream, area);
3289 if (!err)
3290 atomic_inc(&substream->mmap_count);
3291 return err;
3292 }
3293
3294 EXPORT_SYMBOL(snd_pcm_mmap_data);
3295
3296 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3297 {
3298 struct snd_pcm_file * pcm_file;
3299 struct snd_pcm_substream *substream;
3300 unsigned long offset;
3301
3302 pcm_file = file->private_data;
3303 substream = pcm_file->substream;
3304 if (PCM_RUNTIME_CHECK(substream))
3305 return -ENXIO;
3306
3307 offset = area->vm_pgoff << PAGE_SHIFT;
3308 switch (offset) {
3309 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3310 if (pcm_file->no_compat_mmap)
3311 return -ENXIO;
3312 return snd_pcm_mmap_status(substream, file, area);
3313 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3314 if (pcm_file->no_compat_mmap)
3315 return -ENXIO;
3316 return snd_pcm_mmap_control(substream, file, area);
3317 default:
3318 return snd_pcm_mmap_data(substream, file, area);
3319 }
3320 return 0;
3321 }
3322
3323 static int snd_pcm_fasync(int fd, struct file * file, int on)
3324 {
3325 struct snd_pcm_file * pcm_file;
3326 struct snd_pcm_substream *substream;
3327 struct snd_pcm_runtime *runtime;
3328
3329 pcm_file = file->private_data;
3330 substream = pcm_file->substream;
3331 if (PCM_RUNTIME_CHECK(substream))
3332 return -ENXIO;
3333 runtime = substream->runtime;
3334 return fasync_helper(fd, file, on, &runtime->fasync);
3335 }
3336
3337 /*
3338 * ioctl32 compat
3339 */
3340 #ifdef CONFIG_COMPAT
3341 #include "pcm_compat.c"
3342 #else
3343 #define snd_pcm_ioctl_compat NULL
3344 #endif
3345
3346 /*
3347 * To be removed helpers to keep binary compatibility
3348 */
3349
3350 #ifdef CONFIG_SND_SUPPORT_OLD_API
3351 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3352 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3353
3354 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3355 struct snd_pcm_hw_params_old *oparams)
3356 {
3357 unsigned int i;
3358
3359 memset(params, 0, sizeof(*params));
3360 params->flags = oparams->flags;
3361 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3362 params->masks[i].bits[0] = oparams->masks[i];
3363 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3364 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3365 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3366 params->info = oparams->info;
3367 params->msbits = oparams->msbits;
3368 params->rate_num = oparams->rate_num;
3369 params->rate_den = oparams->rate_den;
3370 params->fifo_size = oparams->fifo_size;
3371 }
3372
3373 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3374 struct snd_pcm_hw_params *params)
3375 {
3376 unsigned int i;
3377
3378 memset(oparams, 0, sizeof(*oparams));
3379 oparams->flags = params->flags;
3380 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3381 oparams->masks[i] = params->masks[i].bits[0];
3382 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3383 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3384 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3385 oparams->info = params->info;
3386 oparams->msbits = params->msbits;
3387 oparams->rate_num = params->rate_num;
3388 oparams->rate_den = params->rate_den;
3389 oparams->fifo_size = params->fifo_size;
3390 }
3391
3392 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3393 struct snd_pcm_hw_params_old __user * _oparams)
3394 {
3395 struct snd_pcm_hw_params *params;
3396 struct snd_pcm_hw_params_old *oparams = NULL;
3397 int err;
3398
3399 params = kmalloc(sizeof(*params), GFP_KERNEL);
3400 if (!params)
3401 return -ENOMEM;
3402
3403 oparams = memdup_user(_oparams, sizeof(*oparams));
3404 if (IS_ERR(oparams)) {
3405 err = PTR_ERR(oparams);
3406 goto out;
3407 }
3408 snd_pcm_hw_convert_from_old_params(params, oparams);
3409 err = snd_pcm_hw_refine(substream, params);
3410 snd_pcm_hw_convert_to_old_params(oparams, params);
3411 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3412 if (!err)
3413 err = -EFAULT;
3414 }
3415
3416 kfree(oparams);
3417 out:
3418 kfree(params);
3419 return err;
3420 }
3421
3422 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3423 struct snd_pcm_hw_params_old __user * _oparams)
3424 {
3425 struct snd_pcm_hw_params *params;
3426 struct snd_pcm_hw_params_old *oparams = NULL;
3427 int err;
3428
3429 params = kmalloc(sizeof(*params), GFP_KERNEL);
3430 if (!params)
3431 return -ENOMEM;
3432
3433 oparams = memdup_user(_oparams, sizeof(*oparams));
3434 if (IS_ERR(oparams)) {
3435 err = PTR_ERR(oparams);
3436 goto out;
3437 }
3438 snd_pcm_hw_convert_from_old_params(params, oparams);
3439 err = snd_pcm_hw_params(substream, params);
3440 snd_pcm_hw_convert_to_old_params(oparams, params);
3441 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3442 if (!err)
3443 err = -EFAULT;
3444 }
3445
3446 kfree(oparams);
3447 out:
3448 kfree(params);
3449 return err;
3450 }
3451 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3452
3453 #ifndef CONFIG_MMU
3454 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3455 unsigned long addr,
3456 unsigned long len,
3457 unsigned long pgoff,
3458 unsigned long flags)
3459 {
3460 struct snd_pcm_file *pcm_file = file->private_data;
3461 struct snd_pcm_substream *substream = pcm_file->substream;
3462 struct snd_pcm_runtime *runtime = substream->runtime;
3463 unsigned long offset = pgoff << PAGE_SHIFT;
3464
3465 switch (offset) {
3466 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3467 return (unsigned long)runtime->status;
3468 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3469 return (unsigned long)runtime->control;
3470 default:
3471 return (unsigned long)runtime->dma_area + offset;
3472 }
3473 }
3474 #else
3475 # define snd_pcm_get_unmapped_area NULL
3476 #endif
3477
3478 /*
3479 * Register section
3480 */
3481
3482 const struct file_operations snd_pcm_f_ops[2] = {
3483 {
3484 .owner = THIS_MODULE,
3485 .write = snd_pcm_write,
3486 .aio_write = snd_pcm_aio_write,
3487 .open = snd_pcm_playback_open,
3488 .release = snd_pcm_release,
3489 .llseek = no_llseek,
3490 .poll = snd_pcm_playback_poll,
3491 .unlocked_ioctl = snd_pcm_playback_ioctl,
3492 .compat_ioctl = snd_pcm_ioctl_compat,
3493 .mmap = snd_pcm_mmap,
3494 .fasync = snd_pcm_fasync,
3495 .get_unmapped_area = snd_pcm_get_unmapped_area,
3496 },
3497 {
3498 .owner = THIS_MODULE,
3499 .read = snd_pcm_read,
3500 .aio_read = snd_pcm_aio_read,
3501 .open = snd_pcm_capture_open,
3502 .release = snd_pcm_release,
3503 .llseek = no_llseek,
3504 .poll = snd_pcm_capture_poll,
3505 .unlocked_ioctl = snd_pcm_capture_ioctl,
3506 .compat_ioctl = snd_pcm_ioctl_compat,
3507 .mmap = snd_pcm_mmap,
3508 .fasync = snd_pcm_fasync,
3509 .get_unmapped_area = snd_pcm_get_unmapped_area,
3510 }
3511 };
Linux kernel - Deliverables
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