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