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Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
[linux-2.6/kvm.git] / sound / core / pcm_native.c
blob1c6be91dfb9887ea1b3634735858e27757c42e21
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/file.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/pm_qos_params.h>
27 #include <linux/uio.h>
28 #include <linux/dma-mapping.h>
29 #include <sound/core.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/timer.h>
35 #include <sound/minors.h>
36 #include <asm/io.h>
37 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
38 #include <dma-coherence.h>
39 #endif
40
41 /*
42 * Compatibility
43 */
44
45 struct snd_pcm_hw_params_old {
46 unsigned int flags;
47 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
48 SNDRV_PCM_HW_PARAM_ACCESS + 1];
49 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
50 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
51 unsigned int rmask;
52 unsigned int cmask;
53 unsigned int info;
54 unsigned int msbits;
55 unsigned int rate_num;
56 unsigned int rate_den;
57 snd_pcm_uframes_t fifo_size;
58 unsigned char reserved[64];
59 };
60
61 #ifdef CONFIG_SND_SUPPORT_OLD_API
62 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
63 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
64
65 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
66 struct snd_pcm_hw_params_old __user * _oparams);
67 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
68 struct snd_pcm_hw_params_old __user * _oparams);
69 #endif
70 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
71
72 /*
73 *
74 */
75
76 DEFINE_RWLOCK(snd_pcm_link_rwlock);
77 EXPORT_SYMBOL(snd_pcm_link_rwlock);
78
79 static DECLARE_RWSEM(snd_pcm_link_rwsem);
80
81 static inline mm_segment_t snd_enter_user(void)
82 {
83 mm_segment_t fs = get_fs();
84 set_fs(get_ds());
85 return fs;
86 }
87
88 static inline void snd_leave_user(mm_segment_t fs)
89 {
90 set_fs(fs);
91 }
92
93
94
95 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
96 {
97 struct snd_pcm_runtime *runtime;
98 struct snd_pcm *pcm = substream->pcm;
99 struct snd_pcm_str *pstr = substream->pstr;
100
101 memset(info, 0, sizeof(*info));
102 info->card = pcm->card->number;
103 info->device = pcm->device;
104 info->stream = substream->stream;
105 info->subdevice = substream->number;
106 strlcpy(info->id, pcm->id, sizeof(info->id));
107 strlcpy(info->name, pcm->name, sizeof(info->name));
108 info->dev_class = pcm->dev_class;
109 info->dev_subclass = pcm->dev_subclass;
110 info->subdevices_count = pstr->substream_count;
111 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
112 strlcpy(info->subname, substream->name, sizeof(info->subname));
113 runtime = substream->runtime;
114 /* AB: FIXME!!! This is definitely nonsense */
115 if (runtime) {
116 info->sync = runtime->sync;
117 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
118 }
119 return 0;
120 }
121
122 int snd_pcm_info_user(struct snd_pcm_substream *substream,
123 struct snd_pcm_info __user * _info)
124 {
125 struct snd_pcm_info *info;
126 int err;
127
128 info = kmalloc(sizeof(*info), GFP_KERNEL);
129 if (! info)
130 return -ENOMEM;
131 err = snd_pcm_info(substream, info);
132 if (err >= 0) {
133 if (copy_to_user(_info, info, sizeof(*info)))
134 err = -EFAULT;
135 }
136 kfree(info);
137 return err;
138 }
139
140 #undef RULES_DEBUG
141
142 #ifdef RULES_DEBUG
143 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
144 static const char * const snd_pcm_hw_param_names[] = {
145 HW_PARAM(ACCESS),
146 HW_PARAM(FORMAT),
147 HW_PARAM(SUBFORMAT),
148 HW_PARAM(SAMPLE_BITS),
149 HW_PARAM(FRAME_BITS),
150 HW_PARAM(CHANNELS),
151 HW_PARAM(RATE),
152 HW_PARAM(PERIOD_TIME),
153 HW_PARAM(PERIOD_SIZE),
154 HW_PARAM(PERIOD_BYTES),
155 HW_PARAM(PERIODS),
156 HW_PARAM(BUFFER_TIME),
157 HW_PARAM(BUFFER_SIZE),
158 HW_PARAM(BUFFER_BYTES),
159 HW_PARAM(TICK_TIME),
160 };
161 #endif
162
163 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
164 struct snd_pcm_hw_params *params)
165 {
166 unsigned int k;
167 struct snd_pcm_hardware *hw;
168 struct snd_interval *i = NULL;
169 struct snd_mask *m = NULL;
170 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
171 unsigned int rstamps[constrs->rules_num];
172 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
173 unsigned int stamp = 2;
174 int changed, again;
175
176 params->info = 0;
177 params->fifo_size = 0;
178 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
179 params->msbits = 0;
180 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
181 params->rate_num = 0;
182 params->rate_den = 0;
183 }
184
185 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
186 m = hw_param_mask(params, k);
187 if (snd_mask_empty(m))
188 return -EINVAL;
189 if (!(params->rmask & (1 << k)))
190 continue;
191 #ifdef RULES_DEBUG
192 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
193 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
194 #endif
195 changed = snd_mask_refine(m, constrs_mask(constrs, k));
196 #ifdef RULES_DEBUG
197 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
198 #endif
199 if (changed)
200 params->cmask |= 1 << k;
201 if (changed < 0)
202 return changed;
203 }
204
205 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
206 i = hw_param_interval(params, k);
207 if (snd_interval_empty(i))
208 return -EINVAL;
209 if (!(params->rmask & (1 << k)))
210 continue;
211 #ifdef RULES_DEBUG
212 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
213 if (i->empty)
214 printk("empty");
215 else
216 printk("%c%u %u%c",
217 i->openmin ? '(' : '[', i->min,
218 i->max, i->openmax ? ')' : ']');
219 printk(" -> ");
220 #endif
221 changed = snd_interval_refine(i, constrs_interval(constrs, k));
222 #ifdef RULES_DEBUG
223 if (i->empty)
224 printk("empty\n");
225 else
226 printk("%c%u %u%c\n",
227 i->openmin ? '(' : '[', i->min,
228 i->max, i->openmax ? ')' : ']');
229 #endif
230 if (changed)
231 params->cmask |= 1 << k;
232 if (changed < 0)
233 return changed;
234 }
235
236 for (k = 0; k < constrs->rules_num; k++)
237 rstamps[k] = 0;
238 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
239 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
240 do {
241 again = 0;
242 for (k = 0; k < constrs->rules_num; k++) {
243 struct snd_pcm_hw_rule *r = &constrs->rules[k];
244 unsigned int d;
245 int doit = 0;
246 if (r->cond && !(r->cond & params->flags))
247 continue;
248 for (d = 0; r->deps[d] >= 0; d++) {
249 if (vstamps[r->deps[d]] > rstamps[k]) {
250 doit = 1;
251 break;
252 }
253 }
254 if (!doit)
255 continue;
256 #ifdef RULES_DEBUG
257 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
258 if (r->var >= 0) {
259 printk("%s = ", snd_pcm_hw_param_names[r->var]);
260 if (hw_is_mask(r->var)) {
261 m = hw_param_mask(params, r->var);
262 printk("%x", *m->bits);
263 } else {
264 i = hw_param_interval(params, r->var);
265 if (i->empty)
266 printk("empty");
267 else
268 printk("%c%u %u%c",
269 i->openmin ? '(' : '[', i->min,
270 i->max, i->openmax ? ')' : ']');
271 }
272 }
273 #endif
274 changed = r->func(params, r);
275 #ifdef RULES_DEBUG
276 if (r->var >= 0) {
277 printk(" -> ");
278 if (hw_is_mask(r->var))
279 printk("%x", *m->bits);
280 else {
281 if (i->empty)
282 printk("empty");
283 else
284 printk("%c%u %u%c",
285 i->openmin ? '(' : '[', i->min,
286 i->max, i->openmax ? ')' : ']');
287 }
288 }
289 printk("\n");
290 #endif
291 rstamps[k] = stamp;
292 if (changed && r->var >= 0) {
293 params->cmask |= (1 << r->var);
294 vstamps[r->var] = stamp;
295 again = 1;
296 }
297 if (changed < 0)
298 return changed;
299 stamp++;
300 }
301 } while (again);
302 if (!params->msbits) {
303 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
304 if (snd_interval_single(i))
305 params->msbits = snd_interval_value(i);
306 }
307
308 if (!params->rate_den) {
309 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
310 if (snd_interval_single(i)) {
311 params->rate_num = snd_interval_value(i);
312 params->rate_den = 1;
313 }
314 }
315
316 hw = &substream->runtime->hw;
317 if (!params->info)
318 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
319 if (!params->fifo_size) {
320 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
321 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
322 if (snd_mask_min(m) == snd_mask_max(m) &&
323 snd_interval_min(i) == snd_interval_max(i)) {
324 changed = substream->ops->ioctl(substream,
325 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
326 if (changed < 0)
327 return changed;
328 }
329 }
330 params->rmask = 0;
331 return 0;
332 }
333
334 EXPORT_SYMBOL(snd_pcm_hw_refine);
335
336 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
337 struct snd_pcm_hw_params __user * _params)
338 {
339 struct snd_pcm_hw_params *params;
340 int err;
341
342 params = memdup_user(_params, sizeof(*params));
343 if (IS_ERR(params))
344 return PTR_ERR(params);
345
346 err = snd_pcm_hw_refine(substream, params);
347 if (copy_to_user(_params, params, sizeof(*params))) {
348 if (!err)
349 err = -EFAULT;
350 }
351
352 kfree(params);
353 return err;
354 }
355
356 static int period_to_usecs(struct snd_pcm_runtime *runtime)
357 {
358 int usecs;
359
360 if (! runtime->rate)
361 return -1; /* invalid */
362
363 /* take 75% of period time as the deadline */
364 usecs = (750000 / runtime->rate) * runtime->period_size;
365 usecs += ((750000 % runtime->rate) * runtime->period_size) /
366 runtime->rate;
367
368 return usecs;
369 }
370
371 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
372 struct snd_pcm_hw_params *params)
373 {
374 struct snd_pcm_runtime *runtime;
375 int err, usecs;
376 unsigned int bits;
377 snd_pcm_uframes_t frames;
378
379 if (PCM_RUNTIME_CHECK(substream))
380 return -ENXIO;
381 runtime = substream->runtime;
382 snd_pcm_stream_lock_irq(substream);
383 switch (runtime->status->state) {
384 case SNDRV_PCM_STATE_OPEN:
385 case SNDRV_PCM_STATE_SETUP:
386 case SNDRV_PCM_STATE_PREPARED:
387 break;
388 default:
389 snd_pcm_stream_unlock_irq(substream);
390 return -EBADFD;
391 }
392 snd_pcm_stream_unlock_irq(substream);
393 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
394 if (!substream->oss.oss)
395 #endif
396 if (atomic_read(&substream->mmap_count))
397 return -EBADFD;
398
399 params->rmask = ~0U;
400 err = snd_pcm_hw_refine(substream, params);
401 if (err < 0)
402 goto _error;
403
404 err = snd_pcm_hw_params_choose(substream, params);
405 if (err < 0)
406 goto _error;
407
408 if (substream->ops->hw_params != NULL) {
409 err = substream->ops->hw_params(substream, params);
410 if (err < 0)
411 goto _error;
412 }
413
414 runtime->access = params_access(params);
415 runtime->format = params_format(params);
416 runtime->subformat = params_subformat(params);
417 runtime->channels = params_channels(params);
418 runtime->rate = params_rate(params);
419 runtime->period_size = params_period_size(params);
420 runtime->periods = params_periods(params);
421 runtime->buffer_size = params_buffer_size(params);
422 runtime->info = params->info;
423 runtime->rate_num = params->rate_num;
424 runtime->rate_den = params->rate_den;
425 runtime->no_period_wakeup =
426 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
427 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
428
429 bits = snd_pcm_format_physical_width(runtime->format);
430 runtime->sample_bits = bits;
431 bits *= runtime->channels;
432 runtime->frame_bits = bits;
433 frames = 1;
434 while (bits % 8 != 0) {
435 bits *= 2;
436 frames *= 2;
437 }
438 runtime->byte_align = bits / 8;
439 runtime->min_align = frames;
440
441 /* Default sw params */
442 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
443 runtime->period_step = 1;
444 runtime->control->avail_min = runtime->period_size;
445 runtime->start_threshold = 1;
446 runtime->stop_threshold = runtime->buffer_size;
447 runtime->silence_threshold = 0;
448 runtime->silence_size = 0;
449 runtime->boundary = runtime->buffer_size;
450 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
451 runtime->boundary *= 2;
452
453 snd_pcm_timer_resolution_change(substream);
454 runtime->status->state = SNDRV_PCM_STATE_SETUP;
455
456 if (pm_qos_request_active(&substream->latency_pm_qos_req))
457 pm_qos_remove_request(&substream->latency_pm_qos_req);
458 if ((usecs = period_to_usecs(runtime)) >= 0)
459 pm_qos_add_request(&substream->latency_pm_qos_req,
460 PM_QOS_CPU_DMA_LATENCY, usecs);
461 return 0;
462 _error:
463 /* hardware might be unusable from this time,
464 so we force application to retry to set
465 the correct hardware parameter settings */
466 runtime->status->state = SNDRV_PCM_STATE_OPEN;
467 if (substream->ops->hw_free != NULL)
468 substream->ops->hw_free(substream);
469 return err;
470 }
471
472 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
473 struct snd_pcm_hw_params __user * _params)
474 {
475 struct snd_pcm_hw_params *params;
476 int err;
477
478 params = memdup_user(_params, sizeof(*params));
479 if (IS_ERR(params))
480 return PTR_ERR(params);
481
482 err = snd_pcm_hw_params(substream, params);
483 if (copy_to_user(_params, params, sizeof(*params))) {
484 if (!err)
485 err = -EFAULT;
486 }
487
488 kfree(params);
489 return err;
490 }
491
492 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
493 {
494 struct snd_pcm_runtime *runtime;
495 int result = 0;
496
497 if (PCM_RUNTIME_CHECK(substream))
498 return -ENXIO;
499 runtime = substream->runtime;
500 snd_pcm_stream_lock_irq(substream);
501 switch (runtime->status->state) {
502 case SNDRV_PCM_STATE_SETUP:
503 case SNDRV_PCM_STATE_PREPARED:
504 break;
505 default:
506 snd_pcm_stream_unlock_irq(substream);
507 return -EBADFD;
508 }
509 snd_pcm_stream_unlock_irq(substream);
510 if (atomic_read(&substream->mmap_count))
511 return -EBADFD;
512 if (substream->ops->hw_free)
513 result = substream->ops->hw_free(substream);
514 runtime->status->state = SNDRV_PCM_STATE_OPEN;
515 pm_qos_remove_request(&substream->latency_pm_qos_req);
516 return result;
517 }
518
519 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
520 struct snd_pcm_sw_params *params)
521 {
522 struct snd_pcm_runtime *runtime;
523 int err;
524
525 if (PCM_RUNTIME_CHECK(substream))
526 return -ENXIO;
527 runtime = substream->runtime;
528 snd_pcm_stream_lock_irq(substream);
529 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
530 snd_pcm_stream_unlock_irq(substream);
531 return -EBADFD;
532 }
533 snd_pcm_stream_unlock_irq(substream);
534
535 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
536 return -EINVAL;
537 if (params->avail_min == 0)
538 return -EINVAL;
539 if (params->silence_size >= runtime->boundary) {
540 if (params->silence_threshold != 0)
541 return -EINVAL;
542 } else {
543 if (params->silence_size > params->silence_threshold)
544 return -EINVAL;
545 if (params->silence_threshold > runtime->buffer_size)
546 return -EINVAL;
547 }
548 err = 0;
549 snd_pcm_stream_lock_irq(substream);
550 runtime->tstamp_mode = params->tstamp_mode;
551 runtime->period_step = params->period_step;
552 runtime->control->avail_min = params->avail_min;
553 runtime->start_threshold = params->start_threshold;
554 runtime->stop_threshold = params->stop_threshold;
555 runtime->silence_threshold = params->silence_threshold;
556 runtime->silence_size = params->silence_size;
557 params->boundary = runtime->boundary;
558 if (snd_pcm_running(substream)) {
559 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
560 runtime->silence_size > 0)
561 snd_pcm_playback_silence(substream, ULONG_MAX);
562 err = snd_pcm_update_state(substream, runtime);
563 }
564 snd_pcm_stream_unlock_irq(substream);
565 return err;
566 }
567
568 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
569 struct snd_pcm_sw_params __user * _params)
570 {
571 struct snd_pcm_sw_params params;
572 int err;
573 if (copy_from_user(&params, _params, sizeof(params)))
574 return -EFAULT;
575 err = snd_pcm_sw_params(substream, &params);
576 if (copy_to_user(_params, &params, sizeof(params)))
577 return -EFAULT;
578 return err;
579 }
580
581 int snd_pcm_status(struct snd_pcm_substream *substream,
582 struct snd_pcm_status *status)
583 {
584 struct snd_pcm_runtime *runtime = substream->runtime;
585
586 snd_pcm_stream_lock_irq(substream);
587 status->state = runtime->status->state;
588 status->suspended_state = runtime->status->suspended_state;
589 if (status->state == SNDRV_PCM_STATE_OPEN)
590 goto _end;
591 status->trigger_tstamp = runtime->trigger_tstamp;
592 if (snd_pcm_running(substream)) {
593 snd_pcm_update_hw_ptr(substream);
594 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
595 status->tstamp = runtime->status->tstamp;
596 goto _tstamp_end;
597 }
598 }
599 snd_pcm_gettime(runtime, &status->tstamp);
600 _tstamp_end:
601 status->appl_ptr = runtime->control->appl_ptr;
602 status->hw_ptr = runtime->status->hw_ptr;
603 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
604 status->avail = snd_pcm_playback_avail(runtime);
605 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
606 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
607 status->delay = runtime->buffer_size - status->avail;
608 status->delay += runtime->delay;
609 } else
610 status->delay = 0;
611 } else {
612 status->avail = snd_pcm_capture_avail(runtime);
613 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
614 status->delay = status->avail + runtime->delay;
615 else
616 status->delay = 0;
617 }
618 status->avail_max = runtime->avail_max;
619 status->overrange = runtime->overrange;
620 runtime->avail_max = 0;
621 runtime->overrange = 0;
622 _end:
623 snd_pcm_stream_unlock_irq(substream);
624 return 0;
625 }
626
627 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
628 struct snd_pcm_status __user * _status)
629 {
630 struct snd_pcm_status status;
631 int res;
632
633 memset(&status, 0, sizeof(status));
634 res = snd_pcm_status(substream, &status);
635 if (res < 0)
636 return res;
637 if (copy_to_user(_status, &status, sizeof(status)))
638 return -EFAULT;
639 return 0;
640 }
641
642 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
643 struct snd_pcm_channel_info * info)
644 {
645 struct snd_pcm_runtime *runtime;
646 unsigned int channel;
647
648 channel = info->channel;
649 runtime = substream->runtime;
650 snd_pcm_stream_lock_irq(substream);
651 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
652 snd_pcm_stream_unlock_irq(substream);
653 return -EBADFD;
654 }
655 snd_pcm_stream_unlock_irq(substream);
656 if (channel >= runtime->channels)
657 return -EINVAL;
658 memset(info, 0, sizeof(*info));
659 info->channel = channel;
660 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
661 }
662
663 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
664 struct snd_pcm_channel_info __user * _info)
665 {
666 struct snd_pcm_channel_info info;
667 int res;
668
669 if (copy_from_user(&info, _info, sizeof(info)))
670 return -EFAULT;
671 res = snd_pcm_channel_info(substream, &info);
672 if (res < 0)
673 return res;
674 if (copy_to_user(_info, &info, sizeof(info)))
675 return -EFAULT;
676 return 0;
677 }
678
679 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
680 {
681 struct snd_pcm_runtime *runtime = substream->runtime;
682 if (runtime->trigger_master == NULL)
683 return;
684 if (runtime->trigger_master == substream) {
685 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
686 } else {
687 snd_pcm_trigger_tstamp(runtime->trigger_master);
688 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
689 }
690 runtime->trigger_master = NULL;
691 }
692
693 struct action_ops {
694 int (*pre_action)(struct snd_pcm_substream *substream, int state);
695 int (*do_action)(struct snd_pcm_substream *substream, int state);
696 void (*undo_action)(struct snd_pcm_substream *substream, int state);
697 void (*post_action)(struct snd_pcm_substream *substream, int state);
698 };
699
700 /*
701 * this functions is core for handling of linked stream
702 * Note: the stream state might be changed also on failure
703 * Note2: call with calling stream lock + link lock
704 */
705 static int snd_pcm_action_group(struct action_ops *ops,
706 struct snd_pcm_substream *substream,
707 int state, int do_lock)
708 {
709 struct snd_pcm_substream *s = NULL;
710 struct snd_pcm_substream *s1;
711 int res = 0;
712
713 snd_pcm_group_for_each_entry(s, substream) {
714 if (do_lock && s != substream)
715 spin_lock_nested(&s->self_group.lock,
716 SINGLE_DEPTH_NESTING);
717 res = ops->pre_action(s, state);
718 if (res < 0)
719 goto _unlock;
720 }
721 snd_pcm_group_for_each_entry(s, substream) {
722 res = ops->do_action(s, state);
723 if (res < 0) {
724 if (ops->undo_action) {
725 snd_pcm_group_for_each_entry(s1, substream) {
726 if (s1 == s) /* failed stream */
727 break;
728 ops->undo_action(s1, state);
729 }
730 }
731 s = NULL; /* unlock all */
732 goto _unlock;
733 }
734 }
735 snd_pcm_group_for_each_entry(s, substream) {
736 ops->post_action(s, state);
737 }
738 _unlock:
739 if (do_lock) {
740 /* unlock streams */
741 snd_pcm_group_for_each_entry(s1, substream) {
742 if (s1 != substream)
743 spin_unlock(&s1->self_group.lock);
744 if (s1 == s) /* end */
745 break;
746 }
747 }
748 return res;
749 }
750
751 /*
752 * Note: call with stream lock
753 */
754 static int snd_pcm_action_single(struct action_ops *ops,
755 struct snd_pcm_substream *substream,
756 int state)
757 {
758 int res;
759
760 res = ops->pre_action(substream, state);
761 if (res < 0)
762 return res;
763 res = ops->do_action(substream, state);
764 if (res == 0)
765 ops->post_action(substream, state);
766 else if (ops->undo_action)
767 ops->undo_action(substream, state);
768 return res;
769 }
770
771 /*
772 * Note: call with stream lock
773 */
774 static int snd_pcm_action(struct action_ops *ops,
775 struct snd_pcm_substream *substream,
776 int state)
777 {
778 int res;
779
780 if (snd_pcm_stream_linked(substream)) {
781 if (!spin_trylock(&substream->group->lock)) {
782 spin_unlock(&substream->self_group.lock);
783 spin_lock(&substream->group->lock);
784 spin_lock(&substream->self_group.lock);
785 }
786 res = snd_pcm_action_group(ops, substream, state, 1);
787 spin_unlock(&substream->group->lock);
788 } else {
789 res = snd_pcm_action_single(ops, substream, state);
790 }
791 return res;
792 }
793
794 /*
795 * Note: don't use any locks before
796 */
797 static int snd_pcm_action_lock_irq(struct action_ops *ops,
798 struct snd_pcm_substream *substream,
799 int state)
800 {
801 int res;
802
803 read_lock_irq(&snd_pcm_link_rwlock);
804 if (snd_pcm_stream_linked(substream)) {
805 spin_lock(&substream->group->lock);
806 spin_lock(&substream->self_group.lock);
807 res = snd_pcm_action_group(ops, substream, state, 1);
808 spin_unlock(&substream->self_group.lock);
809 spin_unlock(&substream->group->lock);
810 } else {
811 spin_lock(&substream->self_group.lock);
812 res = snd_pcm_action_single(ops, substream, state);
813 spin_unlock(&substream->self_group.lock);
814 }
815 read_unlock_irq(&snd_pcm_link_rwlock);
816 return res;
817 }
818
819 /*
820 */
821 static int snd_pcm_action_nonatomic(struct action_ops *ops,
822 struct snd_pcm_substream *substream,
823 int state)
824 {
825 int res;
826
827 down_read(&snd_pcm_link_rwsem);
828 if (snd_pcm_stream_linked(substream))
829 res = snd_pcm_action_group(ops, substream, state, 0);
830 else
831 res = snd_pcm_action_single(ops, substream, state);
832 up_read(&snd_pcm_link_rwsem);
833 return res;
834 }
835
836 /*
837 * start callbacks
838 */
839 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
840 {
841 struct snd_pcm_runtime *runtime = substream->runtime;
842 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
843 return -EBADFD;
844 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
845 !snd_pcm_playback_data(substream))
846 return -EPIPE;
847 runtime->trigger_master = substream;
848 return 0;
849 }
850
851 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
852 {
853 if (substream->runtime->trigger_master != substream)
854 return 0;
855 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
856 }
857
858 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
859 {
860 if (substream->runtime->trigger_master == substream)
861 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
862 }
863
864 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
865 {
866 struct snd_pcm_runtime *runtime = substream->runtime;
867 snd_pcm_trigger_tstamp(substream);
868 runtime->hw_ptr_jiffies = jiffies;
869 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
870 runtime->rate;
871 runtime->status->state = state;
872 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
873 runtime->silence_size > 0)
874 snd_pcm_playback_silence(substream, ULONG_MAX);
875 if (substream->timer)
876 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
877 &runtime->trigger_tstamp);
878 }
879
880 static struct action_ops snd_pcm_action_start = {
881 .pre_action = snd_pcm_pre_start,
882 .do_action = snd_pcm_do_start,
883 .undo_action = snd_pcm_undo_start,
884 .post_action = snd_pcm_post_start
885 };
886
887 /**
888 * snd_pcm_start - start all linked streams
889 * @substream: the PCM substream instance
890 */
891 int snd_pcm_start(struct snd_pcm_substream *substream)
892 {
893 return snd_pcm_action(&snd_pcm_action_start, substream,
894 SNDRV_PCM_STATE_RUNNING);
895 }
896
897 /*
898 * stop callbacks
899 */
900 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
901 {
902 struct snd_pcm_runtime *runtime = substream->runtime;
903 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
904 return -EBADFD;
905 runtime->trigger_master = substream;
906 return 0;
907 }
908
909 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
910 {
911 if (substream->runtime->trigger_master == substream &&
912 snd_pcm_running(substream))
913 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
914 return 0; /* unconditonally stop all substreams */
915 }
916
917 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
918 {
919 struct snd_pcm_runtime *runtime = substream->runtime;
920 if (runtime->status->state != state) {
921 snd_pcm_trigger_tstamp(substream);
922 if (substream->timer)
923 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
924 &runtime->trigger_tstamp);
925 runtime->status->state = state;
926 }
927 wake_up(&runtime->sleep);
928 wake_up(&runtime->tsleep);
929 }
930
931 static struct action_ops snd_pcm_action_stop = {
932 .pre_action = snd_pcm_pre_stop,
933 .do_action = snd_pcm_do_stop,
934 .post_action = snd_pcm_post_stop
935 };
936
937 /**
938 * snd_pcm_stop - try to stop all running streams in the substream group
939 * @substream: the PCM substream instance
940 * @state: PCM state after stopping the stream
941 *
942 * The state of each stream is then changed to the given state unconditionally.
943 */
944 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
945 {
946 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
947 }
948
949 EXPORT_SYMBOL(snd_pcm_stop);
950
951 /**
952 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
953 * @substream: the PCM substream
954 *
955 * After stopping, the state is changed to SETUP.
956 * Unlike snd_pcm_stop(), this affects only the given stream.
957 */
958 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
959 {
960 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
961 SNDRV_PCM_STATE_SETUP);
962 }
963
964 /*
965 * pause callbacks
966 */
967 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
968 {
969 struct snd_pcm_runtime *runtime = substream->runtime;
970 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
971 return -ENOSYS;
972 if (push) {
973 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
974 return -EBADFD;
975 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
976 return -EBADFD;
977 runtime->trigger_master = substream;
978 return 0;
979 }
980
981 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
982 {
983 if (substream->runtime->trigger_master != substream)
984 return 0;
985 /* some drivers might use hw_ptr to recover from the pause -
986 update the hw_ptr now */
987 if (push)
988 snd_pcm_update_hw_ptr(substream);
989 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
990 * a delta between the current jiffies, this gives a large enough
991 * delta, effectively to skip the check once.
992 */
993 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
994 return substream->ops->trigger(substream,
995 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
996 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
997 }
998
999 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1000 {
1001 if (substream->runtime->trigger_master == substream)
1002 substream->ops->trigger(substream,
1003 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1004 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1005 }
1006
1007 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1008 {
1009 struct snd_pcm_runtime *runtime = substream->runtime;
1010 snd_pcm_trigger_tstamp(substream);
1011 if (push) {
1012 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1013 if (substream->timer)
1014 snd_timer_notify(substream->timer,
1015 SNDRV_TIMER_EVENT_MPAUSE,
1016 &runtime->trigger_tstamp);
1017 wake_up(&runtime->sleep);
1018 wake_up(&runtime->tsleep);
1019 } else {
1020 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1021 if (substream->timer)
1022 snd_timer_notify(substream->timer,
1023 SNDRV_TIMER_EVENT_MCONTINUE,
1024 &runtime->trigger_tstamp);
1025 }
1026 }
1027
1028 static struct action_ops snd_pcm_action_pause = {
1029 .pre_action = snd_pcm_pre_pause,
1030 .do_action = snd_pcm_do_pause,
1031 .undo_action = snd_pcm_undo_pause,
1032 .post_action = snd_pcm_post_pause
1033 };
1034
1035 /*
1036 * Push/release the pause for all linked streams.
1037 */
1038 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1039 {
1040 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1041 }
1042
1043 #ifdef CONFIG_PM
1044 /* suspend */
1045
1046 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1047 {
1048 struct snd_pcm_runtime *runtime = substream->runtime;
1049 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1050 return -EBUSY;
1051 runtime->trigger_master = substream;
1052 return 0;
1053 }
1054
1055 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1056 {
1057 struct snd_pcm_runtime *runtime = substream->runtime;
1058 if (runtime->trigger_master != substream)
1059 return 0;
1060 if (! snd_pcm_running(substream))
1061 return 0;
1062 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1063 return 0; /* suspend unconditionally */
1064 }
1065
1066 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1067 {
1068 struct snd_pcm_runtime *runtime = substream->runtime;
1069 snd_pcm_trigger_tstamp(substream);
1070 if (substream->timer)
1071 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1072 &runtime->trigger_tstamp);
1073 runtime->status->suspended_state = runtime->status->state;
1074 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1075 wake_up(&runtime->sleep);
1076 wake_up(&runtime->tsleep);
1077 }
1078
1079 static struct action_ops snd_pcm_action_suspend = {
1080 .pre_action = snd_pcm_pre_suspend,
1081 .do_action = snd_pcm_do_suspend,
1082 .post_action = snd_pcm_post_suspend
1083 };
1084
1085 /**
1086 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1087 * @substream: the PCM substream
1088 *
1089 * After this call, all streams are changed to SUSPENDED state.
1090 */
1091 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1092 {
1093 int err;
1094 unsigned long flags;
1095
1096 if (! substream)
1097 return 0;
1098
1099 snd_pcm_stream_lock_irqsave(substream, flags);
1100 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1101 snd_pcm_stream_unlock_irqrestore(substream, flags);
1102 return err;
1103 }
1104
1105 EXPORT_SYMBOL(snd_pcm_suspend);
1106
1107 /**
1108 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1109 * @pcm: the PCM instance
1110 *
1111 * After this call, all streams are changed to SUSPENDED state.
1112 */
1113 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1114 {
1115 struct snd_pcm_substream *substream;
1116 int stream, err = 0;
1117
1118 if (! pcm)
1119 return 0;
1120
1121 for (stream = 0; stream < 2; stream++) {
1122 for (substream = pcm->streams[stream].substream;
1123 substream; substream = substream->next) {
1124 /* FIXME: the open/close code should lock this as well */
1125 if (substream->runtime == NULL)
1126 continue;
1127 err = snd_pcm_suspend(substream);
1128 if (err < 0 && err != -EBUSY)
1129 return err;
1130 }
1131 }
1132 return 0;
1133 }
1134
1135 EXPORT_SYMBOL(snd_pcm_suspend_all);
1136
1137 /* resume */
1138
1139 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1140 {
1141 struct snd_pcm_runtime *runtime = substream->runtime;
1142 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1143 return -ENOSYS;
1144 runtime->trigger_master = substream;
1145 return 0;
1146 }
1147
1148 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1149 {
1150 struct snd_pcm_runtime *runtime = substream->runtime;
1151 if (runtime->trigger_master != substream)
1152 return 0;
1153 /* DMA not running previously? */
1154 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1155 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1156 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1157 return 0;
1158 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1159 }
1160
1161 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1162 {
1163 if (substream->runtime->trigger_master == substream &&
1164 snd_pcm_running(substream))
1165 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1166 }
1167
1168 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1169 {
1170 struct snd_pcm_runtime *runtime = substream->runtime;
1171 snd_pcm_trigger_tstamp(substream);
1172 if (substream->timer)
1173 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1174 &runtime->trigger_tstamp);
1175 runtime->status->state = runtime->status->suspended_state;
1176 }
1177
1178 static struct action_ops snd_pcm_action_resume = {
1179 .pre_action = snd_pcm_pre_resume,
1180 .do_action = snd_pcm_do_resume,
1181 .undo_action = snd_pcm_undo_resume,
1182 .post_action = snd_pcm_post_resume
1183 };
1184
1185 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1186 {
1187 struct snd_card *card = substream->pcm->card;
1188 int res;
1189
1190 snd_power_lock(card);
1191 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1192 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1193 snd_power_unlock(card);
1194 return res;
1195 }
1196
1197 #else
1198
1199 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1200 {
1201 return -ENOSYS;
1202 }
1203
1204 #endif /* CONFIG_PM */
1205
1206 /*
1207 * xrun ioctl
1208 *
1209 * Change the RUNNING stream(s) to XRUN state.
1210 */
1211 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1212 {
1213 struct snd_card *card = substream->pcm->card;
1214 struct snd_pcm_runtime *runtime = substream->runtime;
1215 int result;
1216
1217 snd_power_lock(card);
1218 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1219 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1220 if (result < 0)
1221 goto _unlock;
1222 }
1223
1224 snd_pcm_stream_lock_irq(substream);
1225 switch (runtime->status->state) {
1226 case SNDRV_PCM_STATE_XRUN:
1227 result = 0; /* already there */
1228 break;
1229 case SNDRV_PCM_STATE_RUNNING:
1230 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1231 break;
1232 default:
1233 result = -EBADFD;
1234 }
1235 snd_pcm_stream_unlock_irq(substream);
1236 _unlock:
1237 snd_power_unlock(card);
1238 return result;
1239 }
1240
1241 /*
1242 * reset ioctl
1243 */
1244 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1245 {
1246 struct snd_pcm_runtime *runtime = substream->runtime;
1247 switch (runtime->status->state) {
1248 case SNDRV_PCM_STATE_RUNNING:
1249 case SNDRV_PCM_STATE_PREPARED:
1250 case SNDRV_PCM_STATE_PAUSED:
1251 case SNDRV_PCM_STATE_SUSPENDED:
1252 return 0;
1253 default:
1254 return -EBADFD;
1255 }
1256 }
1257
1258 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1259 {
1260 struct snd_pcm_runtime *runtime = substream->runtime;
1261 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1262 if (err < 0)
1263 return err;
1264 runtime->hw_ptr_base = 0;
1265 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1266 runtime->status->hw_ptr % runtime->period_size;
1267 runtime->silence_start = runtime->status->hw_ptr;
1268 runtime->silence_filled = 0;
1269 return 0;
1270 }
1271
1272 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1273 {
1274 struct snd_pcm_runtime *runtime = substream->runtime;
1275 runtime->control->appl_ptr = runtime->status->hw_ptr;
1276 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1277 runtime->silence_size > 0)
1278 snd_pcm_playback_silence(substream, ULONG_MAX);
1279 }
1280
1281 static struct action_ops snd_pcm_action_reset = {
1282 .pre_action = snd_pcm_pre_reset,
1283 .do_action = snd_pcm_do_reset,
1284 .post_action = snd_pcm_post_reset
1285 };
1286
1287 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1288 {
1289 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1290 }
1291
1292 /*
1293 * prepare ioctl
1294 */
1295 /* we use the second argument for updating f_flags */
1296 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1297 int f_flags)
1298 {
1299 struct snd_pcm_runtime *runtime = substream->runtime;
1300 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1301 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1302 return -EBADFD;
1303 if (snd_pcm_running(substream))
1304 return -EBUSY;
1305 substream->f_flags = f_flags;
1306 return 0;
1307 }
1308
1309 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1310 {
1311 int err;
1312 err = substream->ops->prepare(substream);
1313 if (err < 0)
1314 return err;
1315 return snd_pcm_do_reset(substream, 0);
1316 }
1317
1318 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1319 {
1320 struct snd_pcm_runtime *runtime = substream->runtime;
1321 runtime->control->appl_ptr = runtime->status->hw_ptr;
1322 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1323 }
1324
1325 static struct action_ops snd_pcm_action_prepare = {
1326 .pre_action = snd_pcm_pre_prepare,
1327 .do_action = snd_pcm_do_prepare,
1328 .post_action = snd_pcm_post_prepare
1329 };
1330
1331 /**
1332 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1333 * @substream: the PCM substream instance
1334 * @file: file to refer f_flags
1335 */
1336 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1337 struct file *file)
1338 {
1339 int res;
1340 struct snd_card *card = substream->pcm->card;
1341 int f_flags;
1342
1343 if (file)
1344 f_flags = file->f_flags;
1345 else
1346 f_flags = substream->f_flags;
1347
1348 snd_power_lock(card);
1349 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1350 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1351 substream, f_flags);
1352 snd_power_unlock(card);
1353 return res;
1354 }
1355
1356 /*
1357 * drain ioctl
1358 */
1359
1360 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1361 {
1362 substream->runtime->trigger_master = substream;
1363 return 0;
1364 }
1365
1366 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1367 {
1368 struct snd_pcm_runtime *runtime = substream->runtime;
1369 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1370 switch (runtime->status->state) {
1371 case SNDRV_PCM_STATE_PREPARED:
1372 /* start playback stream if possible */
1373 if (! snd_pcm_playback_empty(substream)) {
1374 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1375 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1376 }
1377 break;
1378 case SNDRV_PCM_STATE_RUNNING:
1379 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1380 break;
1381 default:
1382 break;
1383 }
1384 } else {
1385 /* stop running stream */
1386 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1387 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1388 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1389 snd_pcm_do_stop(substream, new_state);
1390 snd_pcm_post_stop(substream, new_state);
1391 }
1392 }
1393 return 0;
1394 }
1395
1396 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1397 {
1398 }
1399
1400 static struct action_ops snd_pcm_action_drain_init = {
1401 .pre_action = snd_pcm_pre_drain_init,
1402 .do_action = snd_pcm_do_drain_init,
1403 .post_action = snd_pcm_post_drain_init
1404 };
1405
1406 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1407
1408 /*
1409 * Drain the stream(s).
1410 * When the substream is linked, sync until the draining of all playback streams
1411 * is finished.
1412 * After this call, all streams are supposed to be either SETUP or DRAINING
1413 * (capture only) state.
1414 */
1415 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1416 struct file *file)
1417 {
1418 struct snd_card *card;
1419 struct snd_pcm_runtime *runtime;
1420 struct snd_pcm_substream *s;
1421 wait_queue_t wait;
1422 int result = 0;
1423 int nonblock = 0;
1424
1425 card = substream->pcm->card;
1426 runtime = substream->runtime;
1427
1428 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1429 return -EBADFD;
1430
1431 snd_power_lock(card);
1432 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1433 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1434 if (result < 0) {
1435 snd_power_unlock(card);
1436 return result;
1437 }
1438 }
1439
1440 if (file) {
1441 if (file->f_flags & O_NONBLOCK)
1442 nonblock = 1;
1443 } else if (substream->f_flags & O_NONBLOCK)
1444 nonblock = 1;
1445
1446 down_read(&snd_pcm_link_rwsem);
1447 snd_pcm_stream_lock_irq(substream);
1448 /* resume pause */
1449 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1450 snd_pcm_pause(substream, 0);
1451
1452 /* pre-start/stop - all running streams are changed to DRAINING state */
1453 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1454 if (result < 0)
1455 goto unlock;
1456 /* in non-blocking, we don't wait in ioctl but let caller poll */
1457 if (nonblock) {
1458 result = -EAGAIN;
1459 goto unlock;
1460 }
1461
1462 for (;;) {
1463 long tout;
1464 struct snd_pcm_runtime *to_check;
1465 if (signal_pending(current)) {
1466 result = -ERESTARTSYS;
1467 break;
1468 }
1469 /* find a substream to drain */
1470 to_check = NULL;
1471 snd_pcm_group_for_each_entry(s, substream) {
1472 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1473 continue;
1474 runtime = s->runtime;
1475 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1476 to_check = runtime;
1477 break;
1478 }
1479 }
1480 if (!to_check)
1481 break; /* all drained */
1482 init_waitqueue_entry(&wait, current);
1483 add_wait_queue(&to_check->sleep, &wait);
1484 snd_pcm_stream_unlock_irq(substream);
1485 up_read(&snd_pcm_link_rwsem);
1486 snd_power_unlock(card);
1487 if (runtime->no_period_wakeup)
1488 tout = MAX_SCHEDULE_TIMEOUT;
1489 else {
1490 tout = 10;
1491 if (runtime->rate) {
1492 long t = runtime->period_size * 2 / runtime->rate;
1493 tout = max(t, tout);
1494 }
1495 tout = msecs_to_jiffies(tout * 1000);
1496 }
1497 tout = schedule_timeout_interruptible(tout);
1498 snd_power_lock(card);
1499 down_read(&snd_pcm_link_rwsem);
1500 snd_pcm_stream_lock_irq(substream);
1501 remove_wait_queue(&to_check->sleep, &wait);
1502 if (tout == 0) {
1503 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1504 result = -ESTRPIPE;
1505 else {
1506 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1507 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1508 result = -EIO;
1509 }
1510 break;
1511 }
1512 }
1513
1514 unlock:
1515 snd_pcm_stream_unlock_irq(substream);
1516 up_read(&snd_pcm_link_rwsem);
1517 snd_power_unlock(card);
1518
1519 return result;
1520 }
1521
1522 /*
1523 * drop ioctl
1524 *
1525 * Immediately put all linked substreams into SETUP state.
1526 */
1527 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1528 {
1529 struct snd_pcm_runtime *runtime;
1530 int result = 0;
1531
1532 if (PCM_RUNTIME_CHECK(substream))
1533 return -ENXIO;
1534 runtime = substream->runtime;
1535
1536 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1537 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1538 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1539 return -EBADFD;
1540
1541 snd_pcm_stream_lock_irq(substream);
1542 /* resume pause */
1543 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1544 snd_pcm_pause(substream, 0);
1545
1546 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1547 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1548 snd_pcm_stream_unlock_irq(substream);
1549
1550 return result;
1551 }
1552
1553
1554 /* WARNING: Don't forget to fput back the file */
1555 static struct file *snd_pcm_file_fd(int fd)
1556 {
1557 struct file *file;
1558 struct inode *inode;
1559 unsigned int minor;
1560
1561 file = fget(fd);
1562 if (!file)
1563 return NULL;
1564 inode = file->f_path.dentry->d_inode;
1565 if (!S_ISCHR(inode->i_mode) ||
1566 imajor(inode) != snd_major) {
1567 fput(file);
1568 return NULL;
1569 }
1570 minor = iminor(inode);
1571 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1572 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1573 fput(file);
1574 return NULL;
1575 }
1576 return file;
1577 }
1578
1579 /*
1580 * PCM link handling
1581 */
1582 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1583 {
1584 int res = 0;
1585 struct file *file;
1586 struct snd_pcm_file *pcm_file;
1587 struct snd_pcm_substream *substream1;
1588
1589 file = snd_pcm_file_fd(fd);
1590 if (!file)
1591 return -EBADFD;
1592 pcm_file = file->private_data;
1593 substream1 = pcm_file->substream;
1594 down_write(&snd_pcm_link_rwsem);
1595 write_lock_irq(&snd_pcm_link_rwlock);
1596 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1597 substream->runtime->status->state != substream1->runtime->status->state) {
1598 res = -EBADFD;
1599 goto _end;
1600 }
1601 if (snd_pcm_stream_linked(substream1)) {
1602 res = -EALREADY;
1603 goto _end;
1604 }
1605 if (!snd_pcm_stream_linked(substream)) {
1606 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1607 if (substream->group == NULL) {
1608 res = -ENOMEM;
1609 goto _end;
1610 }
1611 spin_lock_init(&substream->group->lock);
1612 INIT_LIST_HEAD(&substream->group->substreams);
1613 list_add_tail(&substream->link_list, &substream->group->substreams);
1614 substream->group->count = 1;
1615 }
1616 list_add_tail(&substream1->link_list, &substream->group->substreams);
1617 substream->group->count++;
1618 substream1->group = substream->group;
1619 _end:
1620 write_unlock_irq(&snd_pcm_link_rwlock);
1621 up_write(&snd_pcm_link_rwsem);
1622 fput(file);
1623 return res;
1624 }
1625
1626 static void relink_to_local(struct snd_pcm_substream *substream)
1627 {
1628 substream->group = &substream->self_group;
1629 INIT_LIST_HEAD(&substream->self_group.substreams);
1630 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1631 }
1632
1633 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1634 {
1635 struct snd_pcm_substream *s;
1636 int res = 0;
1637
1638 down_write(&snd_pcm_link_rwsem);
1639 write_lock_irq(&snd_pcm_link_rwlock);
1640 if (!snd_pcm_stream_linked(substream)) {
1641 res = -EALREADY;
1642 goto _end;
1643 }
1644 list_del(&substream->link_list);
1645 substream->group->count--;
1646 if (substream->group->count == 1) { /* detach the last stream, too */
1647 snd_pcm_group_for_each_entry(s, substream) {
1648 relink_to_local(s);
1649 break;
1650 }
1651 kfree(substream->group);
1652 }
1653 relink_to_local(substream);
1654 _end:
1655 write_unlock_irq(&snd_pcm_link_rwlock);
1656 up_write(&snd_pcm_link_rwsem);
1657 return res;
1658 }
1659
1660 /*
1661 * hw configurator
1662 */
1663 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1664 struct snd_pcm_hw_rule *rule)
1665 {
1666 struct snd_interval t;
1667 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1668 hw_param_interval_c(params, rule->deps[1]), &t);
1669 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1670 }
1671
1672 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1673 struct snd_pcm_hw_rule *rule)
1674 {
1675 struct snd_interval t;
1676 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1677 hw_param_interval_c(params, rule->deps[1]), &t);
1678 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1679 }
1680
1681 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1682 struct snd_pcm_hw_rule *rule)
1683 {
1684 struct snd_interval t;
1685 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1686 hw_param_interval_c(params, rule->deps[1]),
1687 (unsigned long) rule->private, &t);
1688 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1689 }
1690
1691 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1692 struct snd_pcm_hw_rule *rule)
1693 {
1694 struct snd_interval t;
1695 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1696 (unsigned long) rule->private,
1697 hw_param_interval_c(params, rule->deps[1]), &t);
1698 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1699 }
1700
1701 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1702 struct snd_pcm_hw_rule *rule)
1703 {
1704 unsigned int k;
1705 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1706 struct snd_mask m;
1707 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1708 snd_mask_any(&m);
1709 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1710 int bits;
1711 if (! snd_mask_test(mask, k))
1712 continue;
1713 bits = snd_pcm_format_physical_width(k);
1714 if (bits <= 0)
1715 continue; /* ignore invalid formats */
1716 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1717 snd_mask_reset(&m, k);
1718 }
1719 return snd_mask_refine(mask, &m);
1720 }
1721
1722 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1723 struct snd_pcm_hw_rule *rule)
1724 {
1725 struct snd_interval t;
1726 unsigned int k;
1727 t.min = UINT_MAX;
1728 t.max = 0;
1729 t.openmin = 0;
1730 t.openmax = 0;
1731 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1732 int bits;
1733 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1734 continue;
1735 bits = snd_pcm_format_physical_width(k);
1736 if (bits <= 0)
1737 continue; /* ignore invalid formats */
1738 if (t.min > (unsigned)bits)
1739 t.min = bits;
1740 if (t.max < (unsigned)bits)
1741 t.max = bits;
1742 }
1743 t.integer = 1;
1744 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1745 }
1746
1747 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1748 #error "Change this table"
1749 #endif
1750
1751 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1752 48000, 64000, 88200, 96000, 176400, 192000 };
1753
1754 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1755 .count = ARRAY_SIZE(rates),
1756 .list = rates,
1757 };
1758
1759 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1760 struct snd_pcm_hw_rule *rule)
1761 {
1762 struct snd_pcm_hardware *hw = rule->private;
1763 return snd_interval_list(hw_param_interval(params, rule->var),
1764 snd_pcm_known_rates.count,
1765 snd_pcm_known_rates.list, hw->rates);
1766 }
1767
1768 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1769 struct snd_pcm_hw_rule *rule)
1770 {
1771 struct snd_interval t;
1772 struct snd_pcm_substream *substream = rule->private;
1773 t.min = 0;
1774 t.max = substream->buffer_bytes_max;
1775 t.openmin = 0;
1776 t.openmax = 0;
1777 t.integer = 1;
1778 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1779 }
1780
1781 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1782 {
1783 struct snd_pcm_runtime *runtime = substream->runtime;
1784 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1785 int k, err;
1786
1787 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1788 snd_mask_any(constrs_mask(constrs, k));
1789 }
1790
1791 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1792 snd_interval_any(constrs_interval(constrs, k));
1793 }
1794
1795 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1796 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1797 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1798 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1799 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1800
1801 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1802 snd_pcm_hw_rule_format, NULL,
1803 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1804 if (err < 0)
1805 return err;
1806 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1807 snd_pcm_hw_rule_sample_bits, NULL,
1808 SNDRV_PCM_HW_PARAM_FORMAT,
1809 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1810 if (err < 0)
1811 return err;
1812 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1813 snd_pcm_hw_rule_div, NULL,
1814 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1815 if (err < 0)
1816 return err;
1817 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1818 snd_pcm_hw_rule_mul, NULL,
1819 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1820 if (err < 0)
1821 return err;
1822 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1823 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1824 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1825 if (err < 0)
1826 return err;
1827 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1828 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1829 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1830 if (err < 0)
1831 return err;
1832 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1833 snd_pcm_hw_rule_div, NULL,
1834 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1835 if (err < 0)
1836 return err;
1837 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1838 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1839 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1840 if (err < 0)
1841 return err;
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1843 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1844 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1845 if (err < 0)
1846 return err;
1847 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1848 snd_pcm_hw_rule_div, NULL,
1849 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1850 if (err < 0)
1851 return err;
1852 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1853 snd_pcm_hw_rule_div, NULL,
1854 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1855 if (err < 0)
1856 return err;
1857 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1858 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1859 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1860 if (err < 0)
1861 return err;
1862 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1863 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1864 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1865 if (err < 0)
1866 return err;
1867 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1868 snd_pcm_hw_rule_mul, NULL,
1869 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1870 if (err < 0)
1871 return err;
1872 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1873 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1874 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1875 if (err < 0)
1876 return err;
1877 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1878 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1879 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1880 if (err < 0)
1881 return err;
1882 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1883 snd_pcm_hw_rule_muldivk, (void*) 8,
1884 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1885 if (err < 0)
1886 return err;
1887 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1888 snd_pcm_hw_rule_muldivk, (void*) 8,
1889 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1890 if (err < 0)
1891 return err;
1892 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1893 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1894 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1895 if (err < 0)
1896 return err;
1897 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1898 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1899 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1900 if (err < 0)
1901 return err;
1902 return 0;
1903 }
1904
1905 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1906 {
1907 struct snd_pcm_runtime *runtime = substream->runtime;
1908 struct snd_pcm_hardware *hw = &runtime->hw;
1909 int err;
1910 unsigned int mask = 0;
1911
1912 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1913 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1914 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1915 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1916 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1917 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1918 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1919 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1920 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1921 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1922 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1923 }
1924 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1925 if (err < 0)
1926 return err;
1927
1928 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1929 if (err < 0)
1930 return err;
1931
1932 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1933 if (err < 0)
1934 return err;
1935
1936 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1937 hw->channels_min, hw->channels_max);
1938 if (err < 0)
1939 return err;
1940
1941 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1942 hw->rate_min, hw->rate_max);
1943 if (err < 0)
1944 return err;
1945
1946 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1947 hw->period_bytes_min, hw->period_bytes_max);
1948 if (err < 0)
1949 return err;
1950
1951 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1952 hw->periods_min, hw->periods_max);
1953 if (err < 0)
1954 return err;
1955
1956 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1957 hw->period_bytes_min, hw->buffer_bytes_max);
1958 if (err < 0)
1959 return err;
1960
1961 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1962 snd_pcm_hw_rule_buffer_bytes_max, substream,
1963 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1964 if (err < 0)
1965 return err;
1966
1967 /* FIXME: remove */
1968 if (runtime->dma_bytes) {
1969 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1970 if (err < 0)
1971 return -EINVAL;
1972 }
1973
1974 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1975 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1976 snd_pcm_hw_rule_rate, hw,
1977 SNDRV_PCM_HW_PARAM_RATE, -1);
1978 if (err < 0)
1979 return err;
1980 }
1981
1982 /* FIXME: this belong to lowlevel */
1983 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1984
1985 return 0;
1986 }
1987
1988 static void pcm_release_private(struct snd_pcm_substream *substream)
1989 {
1990 snd_pcm_unlink(substream);
1991 }
1992
1993 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1994 {
1995 substream->ref_count--;
1996 if (substream->ref_count > 0)
1997 return;
1998
1999 snd_pcm_drop(substream);
2000 if (substream->hw_opened) {
2001 if (substream->ops->hw_free != NULL)
2002 substream->ops->hw_free(substream);
2003 substream->ops->close(substream);
2004 substream->hw_opened = 0;
2005 }
2006 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2007 pm_qos_remove_request(&substream->latency_pm_qos_req);
2008 if (substream->pcm_release) {
2009 substream->pcm_release(substream);
2010 substream->pcm_release = NULL;
2011 }
2012 snd_pcm_detach_substream(substream);
2013 }
2014
2015 EXPORT_SYMBOL(snd_pcm_release_substream);
2016
2017 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2018 struct file *file,
2019 struct snd_pcm_substream **rsubstream)
2020 {
2021 struct snd_pcm_substream *substream;
2022 int err;
2023
2024 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2025 if (err < 0)
2026 return err;
2027 if (substream->ref_count > 1) {
2028 *rsubstream = substream;
2029 return 0;
2030 }
2031
2032 err = snd_pcm_hw_constraints_init(substream);
2033 if (err < 0) {
2034 snd_printd("snd_pcm_hw_constraints_init failed\n");
2035 goto error;
2036 }
2037
2038 if ((err = substream->ops->open(substream)) < 0)
2039 goto error;
2040
2041 substream->hw_opened = 1;
2042
2043 err = snd_pcm_hw_constraints_complete(substream);
2044 if (err < 0) {
2045 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2046 goto error;
2047 }
2048
2049 *rsubstream = substream;
2050 return 0;
2051
2052 error:
2053 snd_pcm_release_substream(substream);
2054 return err;
2055 }
2056
2057 EXPORT_SYMBOL(snd_pcm_open_substream);
2058
2059 static int snd_pcm_open_file(struct file *file,
2060 struct snd_pcm *pcm,
2061 int stream,
2062 struct snd_pcm_file **rpcm_file)
2063 {
2064 struct snd_pcm_file *pcm_file;
2065 struct snd_pcm_substream *substream;
2066 int err;
2067
2068 if (rpcm_file)
2069 *rpcm_file = NULL;
2070
2071 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2072 if (err < 0)
2073 return err;
2074
2075 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2076 if (pcm_file == NULL) {
2077 snd_pcm_release_substream(substream);
2078 return -ENOMEM;
2079 }
2080 pcm_file->substream = substream;
2081 if (substream->ref_count == 1) {
2082 substream->file = pcm_file;
2083 substream->pcm_release = pcm_release_private;
2084 }
2085 file->private_data = pcm_file;
2086 if (rpcm_file)
2087 *rpcm_file = pcm_file;
2088 return 0;
2089 }
2090
2091 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2092 {
2093 struct snd_pcm *pcm;
2094 int err = nonseekable_open(inode, file);
2095 if (err < 0)
2096 return err;
2097 pcm = snd_lookup_minor_data(iminor(inode),
2098 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2099 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2100 }
2101
2102 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2103 {
2104 struct snd_pcm *pcm;
2105 int err = nonseekable_open(inode, file);
2106 if (err < 0)
2107 return err;
2108 pcm = snd_lookup_minor_data(iminor(inode),
2109 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2110 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2111 }
2112
2113 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2114 {
2115 int err;
2116 struct snd_pcm_file *pcm_file;
2117 wait_queue_t wait;
2118
2119 if (pcm == NULL) {
2120 err = -ENODEV;
2121 goto __error1;
2122 }
2123 err = snd_card_file_add(pcm->card, file);
2124 if (err < 0)
2125 goto __error1;
2126 if (!try_module_get(pcm->card->module)) {
2127 err = -EFAULT;
2128 goto __error2;
2129 }
2130 init_waitqueue_entry(&wait, current);
2131 add_wait_queue(&pcm->open_wait, &wait);
2132 mutex_lock(&pcm->open_mutex);
2133 while (1) {
2134 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2135 if (err >= 0)
2136 break;
2137 if (err == -EAGAIN) {
2138 if (file->f_flags & O_NONBLOCK) {
2139 err = -EBUSY;
2140 break;
2141 }
2142 } else
2143 break;
2144 set_current_state(TASK_INTERRUPTIBLE);
2145 mutex_unlock(&pcm->open_mutex);
2146 schedule();
2147 mutex_lock(&pcm->open_mutex);
2148 if (signal_pending(current)) {
2149 err = -ERESTARTSYS;
2150 break;
2151 }
2152 }
2153 remove_wait_queue(&pcm->open_wait, &wait);
2154 mutex_unlock(&pcm->open_mutex);
2155 if (err < 0)
2156 goto __error;
2157 return err;
2158
2159 __error:
2160 module_put(pcm->card->module);
2161 __error2:
2162 snd_card_file_remove(pcm->card, file);
2163 __error1:
2164 return err;
2165 }
2166
2167 static int snd_pcm_release(struct inode *inode, struct file *file)
2168 {
2169 struct snd_pcm *pcm;
2170 struct snd_pcm_substream *substream;
2171 struct snd_pcm_file *pcm_file;
2172
2173 pcm_file = file->private_data;
2174 substream = pcm_file->substream;
2175 if (snd_BUG_ON(!substream))
2176 return -ENXIO;
2177 pcm = substream->pcm;
2178 mutex_lock(&pcm->open_mutex);
2179 snd_pcm_release_substream(substream);
2180 kfree(pcm_file);
2181 mutex_unlock(&pcm->open_mutex);
2182 wake_up(&pcm->open_wait);
2183 module_put(pcm->card->module);
2184 snd_card_file_remove(pcm->card, file);
2185 return 0;
2186 }
2187
2188 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2189 snd_pcm_uframes_t frames)
2190 {
2191 struct snd_pcm_runtime *runtime = substream->runtime;
2192 snd_pcm_sframes_t appl_ptr;
2193 snd_pcm_sframes_t ret;
2194 snd_pcm_sframes_t hw_avail;
2195
2196 if (frames == 0)
2197 return 0;
2198
2199 snd_pcm_stream_lock_irq(substream);
2200 switch (runtime->status->state) {
2201 case SNDRV_PCM_STATE_PREPARED:
2202 break;
2203 case SNDRV_PCM_STATE_DRAINING:
2204 case SNDRV_PCM_STATE_RUNNING:
2205 if (snd_pcm_update_hw_ptr(substream) >= 0)
2206 break;
2207 /* Fall through */
2208 case SNDRV_PCM_STATE_XRUN:
2209 ret = -EPIPE;
2210 goto __end;
2211 case SNDRV_PCM_STATE_SUSPENDED:
2212 ret = -ESTRPIPE;
2213 goto __end;
2214 default:
2215 ret = -EBADFD;
2216 goto __end;
2217 }
2218
2219 hw_avail = snd_pcm_playback_hw_avail(runtime);
2220 if (hw_avail <= 0) {
2221 ret = 0;
2222 goto __end;
2223 }
2224 if (frames > (snd_pcm_uframes_t)hw_avail)
2225 frames = hw_avail;
2226 appl_ptr = runtime->control->appl_ptr - frames;
2227 if (appl_ptr < 0)
2228 appl_ptr += runtime->boundary;
2229 runtime->control->appl_ptr = appl_ptr;
2230 ret = frames;
2231 __end:
2232 snd_pcm_stream_unlock_irq(substream);
2233 return ret;
2234 }
2235
2236 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2237 snd_pcm_uframes_t frames)
2238 {
2239 struct snd_pcm_runtime *runtime = substream->runtime;
2240 snd_pcm_sframes_t appl_ptr;
2241 snd_pcm_sframes_t ret;
2242 snd_pcm_sframes_t hw_avail;
2243
2244 if (frames == 0)
2245 return 0;
2246
2247 snd_pcm_stream_lock_irq(substream);
2248 switch (runtime->status->state) {
2249 case SNDRV_PCM_STATE_PREPARED:
2250 case SNDRV_PCM_STATE_DRAINING:
2251 break;
2252 case SNDRV_PCM_STATE_RUNNING:
2253 if (snd_pcm_update_hw_ptr(substream) >= 0)
2254 break;
2255 /* Fall through */
2256 case SNDRV_PCM_STATE_XRUN:
2257 ret = -EPIPE;
2258 goto __end;
2259 case SNDRV_PCM_STATE_SUSPENDED:
2260 ret = -ESTRPIPE;
2261 goto __end;
2262 default:
2263 ret = -EBADFD;
2264 goto __end;
2265 }
2266
2267 hw_avail = snd_pcm_capture_hw_avail(runtime);
2268 if (hw_avail <= 0) {
2269 ret = 0;
2270 goto __end;
2271 }
2272 if (frames > (snd_pcm_uframes_t)hw_avail)
2273 frames = hw_avail;
2274 appl_ptr = runtime->control->appl_ptr - frames;
2275 if (appl_ptr < 0)
2276 appl_ptr += runtime->boundary;
2277 runtime->control->appl_ptr = appl_ptr;
2278 ret = frames;
2279 __end:
2280 snd_pcm_stream_unlock_irq(substream);
2281 return ret;
2282 }
2283
2284 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2285 snd_pcm_uframes_t frames)
2286 {
2287 struct snd_pcm_runtime *runtime = substream->runtime;
2288 snd_pcm_sframes_t appl_ptr;
2289 snd_pcm_sframes_t ret;
2290 snd_pcm_sframes_t avail;
2291
2292 if (frames == 0)
2293 return 0;
2294
2295 snd_pcm_stream_lock_irq(substream);
2296 switch (runtime->status->state) {
2297 case SNDRV_PCM_STATE_PREPARED:
2298 case SNDRV_PCM_STATE_PAUSED:
2299 break;
2300 case SNDRV_PCM_STATE_DRAINING:
2301 case SNDRV_PCM_STATE_RUNNING:
2302 if (snd_pcm_update_hw_ptr(substream) >= 0)
2303 break;
2304 /* Fall through */
2305 case SNDRV_PCM_STATE_XRUN:
2306 ret = -EPIPE;
2307 goto __end;
2308 case SNDRV_PCM_STATE_SUSPENDED:
2309 ret = -ESTRPIPE;
2310 goto __end;
2311 default:
2312 ret = -EBADFD;
2313 goto __end;
2314 }
2315
2316 avail = snd_pcm_playback_avail(runtime);
2317 if (avail <= 0) {
2318 ret = 0;
2319 goto __end;
2320 }
2321 if (frames > (snd_pcm_uframes_t)avail)
2322 frames = avail;
2323 appl_ptr = runtime->control->appl_ptr + frames;
2324 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2325 appl_ptr -= runtime->boundary;
2326 runtime->control->appl_ptr = appl_ptr;
2327 ret = frames;
2328 __end:
2329 snd_pcm_stream_unlock_irq(substream);
2330 return ret;
2331 }
2332
2333 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2334 snd_pcm_uframes_t frames)
2335 {
2336 struct snd_pcm_runtime *runtime = substream->runtime;
2337 snd_pcm_sframes_t appl_ptr;
2338 snd_pcm_sframes_t ret;
2339 snd_pcm_sframes_t avail;
2340
2341 if (frames == 0)
2342 return 0;
2343
2344 snd_pcm_stream_lock_irq(substream);
2345 switch (runtime->status->state) {
2346 case SNDRV_PCM_STATE_PREPARED:
2347 case SNDRV_PCM_STATE_DRAINING:
2348 case SNDRV_PCM_STATE_PAUSED:
2349 break;
2350 case SNDRV_PCM_STATE_RUNNING:
2351 if (snd_pcm_update_hw_ptr(substream) >= 0)
2352 break;
2353 /* Fall through */
2354 case SNDRV_PCM_STATE_XRUN:
2355 ret = -EPIPE;
2356 goto __end;
2357 case SNDRV_PCM_STATE_SUSPENDED:
2358 ret = -ESTRPIPE;
2359 goto __end;
2360 default:
2361 ret = -EBADFD;
2362 goto __end;
2363 }
2364
2365 avail = snd_pcm_capture_avail(runtime);
2366 if (avail <= 0) {
2367 ret = 0;
2368 goto __end;
2369 }
2370 if (frames > (snd_pcm_uframes_t)avail)
2371 frames = avail;
2372 appl_ptr = runtime->control->appl_ptr + frames;
2373 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2374 appl_ptr -= runtime->boundary;
2375 runtime->control->appl_ptr = appl_ptr;
2376 ret = frames;
2377 __end:
2378 snd_pcm_stream_unlock_irq(substream);
2379 return ret;
2380 }
2381
2382 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2383 {
2384 struct snd_pcm_runtime *runtime = substream->runtime;
2385 int err;
2386
2387 snd_pcm_stream_lock_irq(substream);
2388 switch (runtime->status->state) {
2389 case SNDRV_PCM_STATE_DRAINING:
2390 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2391 goto __badfd;
2392 case SNDRV_PCM_STATE_RUNNING:
2393 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2394 break;
2395 /* Fall through */
2396 case SNDRV_PCM_STATE_PREPARED:
2397 case SNDRV_PCM_STATE_SUSPENDED:
2398 err = 0;
2399 break;
2400 case SNDRV_PCM_STATE_XRUN:
2401 err = -EPIPE;
2402 break;
2403 default:
2404 __badfd:
2405 err = -EBADFD;
2406 break;
2407 }
2408 snd_pcm_stream_unlock_irq(substream);
2409 return err;
2410 }
2411
2412 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2413 snd_pcm_sframes_t __user *res)
2414 {
2415 struct snd_pcm_runtime *runtime = substream->runtime;
2416 int err;
2417 snd_pcm_sframes_t n = 0;
2418
2419 snd_pcm_stream_lock_irq(substream);
2420 switch (runtime->status->state) {
2421 case SNDRV_PCM_STATE_DRAINING:
2422 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2423 goto __badfd;
2424 case SNDRV_PCM_STATE_RUNNING:
2425 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2426 break;
2427 /* Fall through */
2428 case SNDRV_PCM_STATE_PREPARED:
2429 case SNDRV_PCM_STATE_SUSPENDED:
2430 err = 0;
2431 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2432 n = snd_pcm_playback_hw_avail(runtime);
2433 else
2434 n = snd_pcm_capture_avail(runtime);
2435 n += runtime->delay;
2436 break;
2437 case SNDRV_PCM_STATE_XRUN:
2438 err = -EPIPE;
2439 break;
2440 default:
2441 __badfd:
2442 err = -EBADFD;
2443 break;
2444 }
2445 snd_pcm_stream_unlock_irq(substream);
2446 if (!err)
2447 if (put_user(n, res))
2448 err = -EFAULT;
2449 return err;
2450 }
2451
2452 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2453 struct snd_pcm_sync_ptr __user *_sync_ptr)
2454 {
2455 struct snd_pcm_runtime *runtime = substream->runtime;
2456 struct snd_pcm_sync_ptr sync_ptr;
2457 volatile struct snd_pcm_mmap_status *status;
2458 volatile struct snd_pcm_mmap_control *control;
2459 int err;
2460
2461 memset(&sync_ptr, 0, sizeof(sync_ptr));
2462 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2463 return -EFAULT;
2464 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2465 return -EFAULT;
2466 status = runtime->status;
2467 control = runtime->control;
2468 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2469 err = snd_pcm_hwsync(substream);
2470 if (err < 0)
2471 return err;
2472 }
2473 snd_pcm_stream_lock_irq(substream);
2474 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2475 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2476 else
2477 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2478 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2479 control->avail_min = sync_ptr.c.control.avail_min;
2480 else
2481 sync_ptr.c.control.avail_min = control->avail_min;
2482 sync_ptr.s.status.state = status->state;
2483 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2484 sync_ptr.s.status.tstamp = status->tstamp;
2485 sync_ptr.s.status.suspended_state = status->suspended_state;
2486 snd_pcm_stream_unlock_irq(substream);
2487 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2488 return -EFAULT;
2489 return 0;
2490 }
2491
2492 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2493 {
2494 struct snd_pcm_runtime *runtime = substream->runtime;
2495 int arg;
2496
2497 if (get_user(arg, _arg))
2498 return -EFAULT;
2499 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2500 return -EINVAL;
2501 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2502 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2503 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2504 return 0;
2505 }
2506
2507 static int snd_pcm_common_ioctl1(struct file *file,
2508 struct snd_pcm_substream *substream,
2509 unsigned int cmd, void __user *arg)
2510 {
2511 switch (cmd) {
2512 case SNDRV_PCM_IOCTL_PVERSION:
2513 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2514 case SNDRV_PCM_IOCTL_INFO:
2515 return snd_pcm_info_user(substream, arg);
2516 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2517 return 0;
2518 case SNDRV_PCM_IOCTL_TTSTAMP:
2519 return snd_pcm_tstamp(substream, arg);
2520 case SNDRV_PCM_IOCTL_HW_REFINE:
2521 return snd_pcm_hw_refine_user(substream, arg);
2522 case SNDRV_PCM_IOCTL_HW_PARAMS:
2523 return snd_pcm_hw_params_user(substream, arg);
2524 case SNDRV_PCM_IOCTL_HW_FREE:
2525 return snd_pcm_hw_free(substream);
2526 case SNDRV_PCM_IOCTL_SW_PARAMS:
2527 return snd_pcm_sw_params_user(substream, arg);
2528 case SNDRV_PCM_IOCTL_STATUS:
2529 return snd_pcm_status_user(substream, arg);
2530 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2531 return snd_pcm_channel_info_user(substream, arg);
2532 case SNDRV_PCM_IOCTL_PREPARE:
2533 return snd_pcm_prepare(substream, file);
2534 case SNDRV_PCM_IOCTL_RESET:
2535 return snd_pcm_reset(substream);
2536 case SNDRV_PCM_IOCTL_START:
2537 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2538 case SNDRV_PCM_IOCTL_LINK:
2539 return snd_pcm_link(substream, (int)(unsigned long) arg);
2540 case SNDRV_PCM_IOCTL_UNLINK:
2541 return snd_pcm_unlink(substream);
2542 case SNDRV_PCM_IOCTL_RESUME:
2543 return snd_pcm_resume(substream);
2544 case SNDRV_PCM_IOCTL_XRUN:
2545 return snd_pcm_xrun(substream);
2546 case SNDRV_PCM_IOCTL_HWSYNC:
2547 return snd_pcm_hwsync(substream);
2548 case SNDRV_PCM_IOCTL_DELAY:
2549 return snd_pcm_delay(substream, arg);
2550 case SNDRV_PCM_IOCTL_SYNC_PTR:
2551 return snd_pcm_sync_ptr(substream, arg);
2552 #ifdef CONFIG_SND_SUPPORT_OLD_API
2553 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2554 return snd_pcm_hw_refine_old_user(substream, arg);
2555 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2556 return snd_pcm_hw_params_old_user(substream, arg);
2557 #endif
2558 case SNDRV_PCM_IOCTL_DRAIN:
2559 return snd_pcm_drain(substream, file);
2560 case SNDRV_PCM_IOCTL_DROP:
2561 return snd_pcm_drop(substream);
2562 case SNDRV_PCM_IOCTL_PAUSE:
2563 {
2564 int res;
2565 snd_pcm_stream_lock_irq(substream);
2566 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2567 snd_pcm_stream_unlock_irq(substream);
2568 return res;
2569 }
2570 }
2571 snd_printd("unknown ioctl = 0x%x\n", cmd);
2572 return -ENOTTY;
2573 }
2574
2575 static int snd_pcm_playback_ioctl1(struct file *file,
2576 struct snd_pcm_substream *substream,
2577 unsigned int cmd, void __user *arg)
2578 {
2579 if (snd_BUG_ON(!substream))
2580 return -ENXIO;
2581 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2582 return -EINVAL;
2583 switch (cmd) {
2584 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2585 {
2586 struct snd_xferi xferi;
2587 struct snd_xferi __user *_xferi = arg;
2588 struct snd_pcm_runtime *runtime = substream->runtime;
2589 snd_pcm_sframes_t result;
2590 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2591 return -EBADFD;
2592 if (put_user(0, &_xferi->result))
2593 return -EFAULT;
2594 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2595 return -EFAULT;
2596 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2597 __put_user(result, &_xferi->result);
2598 return result < 0 ? result : 0;
2599 }
2600 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2601 {
2602 struct snd_xfern xfern;
2603 struct snd_xfern __user *_xfern = arg;
2604 struct snd_pcm_runtime *runtime = substream->runtime;
2605 void __user **bufs;
2606 snd_pcm_sframes_t result;
2607 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2608 return -EBADFD;
2609 if (runtime->channels > 128)
2610 return -EINVAL;
2611 if (put_user(0, &_xfern->result))
2612 return -EFAULT;
2613 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2614 return -EFAULT;
2615
2616 bufs = memdup_user(xfern.bufs,
2617 sizeof(void *) * runtime->channels);
2618 if (IS_ERR(bufs))
2619 return PTR_ERR(bufs);
2620 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2621 kfree(bufs);
2622 __put_user(result, &_xfern->result);
2623 return result < 0 ? result : 0;
2624 }
2625 case SNDRV_PCM_IOCTL_REWIND:
2626 {
2627 snd_pcm_uframes_t frames;
2628 snd_pcm_uframes_t __user *_frames = arg;
2629 snd_pcm_sframes_t result;
2630 if (get_user(frames, _frames))
2631 return -EFAULT;
2632 if (put_user(0, _frames))
2633 return -EFAULT;
2634 result = snd_pcm_playback_rewind(substream, frames);
2635 __put_user(result, _frames);
2636 return result < 0 ? result : 0;
2637 }
2638 case SNDRV_PCM_IOCTL_FORWARD:
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_forward(substream, frames);
2648 __put_user(result, _frames);
2649 return result < 0 ? result : 0;
2650 }
2651 }
2652 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2653 }
2654
2655 static int snd_pcm_capture_ioctl1(struct file *file,
2656 struct snd_pcm_substream *substream,
2657 unsigned int cmd, void __user *arg)
2658 {
2659 if (snd_BUG_ON(!substream))
2660 return -ENXIO;
2661 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2662 return -EINVAL;
2663 switch (cmd) {
2664 case SNDRV_PCM_IOCTL_READI_FRAMES:
2665 {
2666 struct snd_xferi xferi;
2667 struct snd_xferi __user *_xferi = arg;
2668 struct snd_pcm_runtime *runtime = substream->runtime;
2669 snd_pcm_sframes_t result;
2670 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2671 return -EBADFD;
2672 if (put_user(0, &_xferi->result))
2673 return -EFAULT;
2674 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2675 return -EFAULT;
2676 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2677 __put_user(result, &_xferi->result);
2678 return result < 0 ? result : 0;
2679 }
2680 case SNDRV_PCM_IOCTL_READN_FRAMES:
2681 {
2682 struct snd_xfern xfern;
2683 struct snd_xfern __user *_xfern = arg;
2684 struct snd_pcm_runtime *runtime = substream->runtime;
2685 void *bufs;
2686 snd_pcm_sframes_t result;
2687 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2688 return -EBADFD;
2689 if (runtime->channels > 128)
2690 return -EINVAL;
2691 if (put_user(0, &_xfern->result))
2692 return -EFAULT;
2693 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2694 return -EFAULT;
2695
2696 bufs = memdup_user(xfern.bufs,
2697 sizeof(void *) * runtime->channels);
2698 if (IS_ERR(bufs))
2699 return PTR_ERR(bufs);
2700 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2701 kfree(bufs);
2702 __put_user(result, &_xfern->result);
2703 return result < 0 ? result : 0;
2704 }
2705 case SNDRV_PCM_IOCTL_REWIND:
2706 {
2707 snd_pcm_uframes_t frames;
2708 snd_pcm_uframes_t __user *_frames = arg;
2709 snd_pcm_sframes_t result;
2710 if (get_user(frames, _frames))
2711 return -EFAULT;
2712 if (put_user(0, _frames))
2713 return -EFAULT;
2714 result = snd_pcm_capture_rewind(substream, frames);
2715 __put_user(result, _frames);
2716 return result < 0 ? result : 0;
2717 }
2718 case SNDRV_PCM_IOCTL_FORWARD:
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_forward(substream, frames);
2728 __put_user(result, _frames);
2729 return result < 0 ? result : 0;
2730 }
2731 }
2732 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2733 }
2734
2735 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2736 unsigned long arg)
2737 {
2738 struct snd_pcm_file *pcm_file;
2739
2740 pcm_file = file->private_data;
2741
2742 if (((cmd >> 8) & 0xff) != 'A')
2743 return -ENOTTY;
2744
2745 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2746 (void __user *)arg);
2747 }
2748
2749 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2750 unsigned long arg)
2751 {
2752 struct snd_pcm_file *pcm_file;
2753
2754 pcm_file = file->private_data;
2755
2756 if (((cmd >> 8) & 0xff) != 'A')
2757 return -ENOTTY;
2758
2759 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2760 (void __user *)arg);
2761 }
2762
2763 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2764 unsigned int cmd, void *arg)
2765 {
2766 mm_segment_t fs;
2767 int result;
2768
2769 fs = snd_enter_user();
2770 switch (substream->stream) {
2771 case SNDRV_PCM_STREAM_PLAYBACK:
2772 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2773 (void __user *)arg);
2774 break;
2775 case SNDRV_PCM_STREAM_CAPTURE:
2776 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2777 (void __user *)arg);
2778 break;
2779 default:
2780 result = -EINVAL;
2781 break;
2782 }
2783 snd_leave_user(fs);
2784 return result;
2785 }
2786
2787 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2788
2789 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2790 loff_t * offset)
2791 {
2792 struct snd_pcm_file *pcm_file;
2793 struct snd_pcm_substream *substream;
2794 struct snd_pcm_runtime *runtime;
2795 snd_pcm_sframes_t result;
2796
2797 pcm_file = file->private_data;
2798 substream = pcm_file->substream;
2799 if (PCM_RUNTIME_CHECK(substream))
2800 return -ENXIO;
2801 runtime = substream->runtime;
2802 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2803 return -EBADFD;
2804 if (!frame_aligned(runtime, count))
2805 return -EINVAL;
2806 count = bytes_to_frames(runtime, count);
2807 result = snd_pcm_lib_read(substream, buf, count);
2808 if (result > 0)
2809 result = frames_to_bytes(runtime, result);
2810 return result;
2811 }
2812
2813 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2814 size_t count, loff_t * offset)
2815 {
2816 struct snd_pcm_file *pcm_file;
2817 struct snd_pcm_substream *substream;
2818 struct snd_pcm_runtime *runtime;
2819 snd_pcm_sframes_t result;
2820
2821 pcm_file = file->private_data;
2822 substream = pcm_file->substream;
2823 if (PCM_RUNTIME_CHECK(substream))
2824 return -ENXIO;
2825 runtime = substream->runtime;
2826 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2827 return -EBADFD;
2828 if (!frame_aligned(runtime, count))
2829 return -EINVAL;
2830 count = bytes_to_frames(runtime, count);
2831 result = snd_pcm_lib_write(substream, buf, count);
2832 if (result > 0)
2833 result = frames_to_bytes(runtime, result);
2834 return result;
2835 }
2836
2837 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2838 unsigned long nr_segs, loff_t pos)
2839
2840 {
2841 struct snd_pcm_file *pcm_file;
2842 struct snd_pcm_substream *substream;
2843 struct snd_pcm_runtime *runtime;
2844 snd_pcm_sframes_t result;
2845 unsigned long i;
2846 void __user **bufs;
2847 snd_pcm_uframes_t frames;
2848
2849 pcm_file = iocb->ki_filp->private_data;
2850 substream = pcm_file->substream;
2851 if (PCM_RUNTIME_CHECK(substream))
2852 return -ENXIO;
2853 runtime = substream->runtime;
2854 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2855 return -EBADFD;
2856 if (nr_segs > 1024 || nr_segs != runtime->channels)
2857 return -EINVAL;
2858 if (!frame_aligned(runtime, iov->iov_len))
2859 return -EINVAL;
2860 frames = bytes_to_samples(runtime, iov->iov_len);
2861 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2862 if (bufs == NULL)
2863 return -ENOMEM;
2864 for (i = 0; i < nr_segs; ++i)
2865 bufs[i] = iov[i].iov_base;
2866 result = snd_pcm_lib_readv(substream, bufs, frames);
2867 if (result > 0)
2868 result = frames_to_bytes(runtime, result);
2869 kfree(bufs);
2870 return result;
2871 }
2872
2873 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2874 unsigned long nr_segs, loff_t pos)
2875 {
2876 struct snd_pcm_file *pcm_file;
2877 struct snd_pcm_substream *substream;
2878 struct snd_pcm_runtime *runtime;
2879 snd_pcm_sframes_t result;
2880 unsigned long i;
2881 void __user **bufs;
2882 snd_pcm_uframes_t frames;
2883
2884 pcm_file = iocb->ki_filp->private_data;
2885 substream = pcm_file->substream;
2886 if (PCM_RUNTIME_CHECK(substream))
2887 return -ENXIO;
2888 runtime = substream->runtime;
2889 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2890 return -EBADFD;
2891 if (nr_segs > 128 || nr_segs != runtime->channels ||
2892 !frame_aligned(runtime, iov->iov_len))
2893 return -EINVAL;
2894 frames = bytes_to_samples(runtime, iov->iov_len);
2895 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2896 if (bufs == NULL)
2897 return -ENOMEM;
2898 for (i = 0; i < nr_segs; ++i)
2899 bufs[i] = iov[i].iov_base;
2900 result = snd_pcm_lib_writev(substream, bufs, frames);
2901 if (result > 0)
2902 result = frames_to_bytes(runtime, result);
2903 kfree(bufs);
2904 return result;
2905 }
2906
2907 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2908 {
2909 struct snd_pcm_file *pcm_file;
2910 struct snd_pcm_substream *substream;
2911 struct snd_pcm_runtime *runtime;
2912 unsigned int mask;
2913 snd_pcm_uframes_t avail;
2914
2915 pcm_file = file->private_data;
2916
2917 substream = pcm_file->substream;
2918 if (PCM_RUNTIME_CHECK(substream))
2919 return -ENXIO;
2920 runtime = substream->runtime;
2921
2922 poll_wait(file, &runtime->sleep, wait);
2923
2924 snd_pcm_stream_lock_irq(substream);
2925 avail = snd_pcm_playback_avail(runtime);
2926 switch (runtime->status->state) {
2927 case SNDRV_PCM_STATE_RUNNING:
2928 case SNDRV_PCM_STATE_PREPARED:
2929 case SNDRV_PCM_STATE_PAUSED:
2930 if (avail >= runtime->control->avail_min) {
2931 mask = POLLOUT | POLLWRNORM;
2932 break;
2933 }
2934 /* Fall through */
2935 case SNDRV_PCM_STATE_DRAINING:
2936 mask = 0;
2937 break;
2938 default:
2939 mask = POLLOUT | POLLWRNORM | POLLERR;
2940 break;
2941 }
2942 snd_pcm_stream_unlock_irq(substream);
2943 return mask;
2944 }
2945
2946 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2947 {
2948 struct snd_pcm_file *pcm_file;
2949 struct snd_pcm_substream *substream;
2950 struct snd_pcm_runtime *runtime;
2951 unsigned int mask;
2952 snd_pcm_uframes_t avail;
2953
2954 pcm_file = file->private_data;
2955
2956 substream = pcm_file->substream;
2957 if (PCM_RUNTIME_CHECK(substream))
2958 return -ENXIO;
2959 runtime = substream->runtime;
2960
2961 poll_wait(file, &runtime->sleep, wait);
2962
2963 snd_pcm_stream_lock_irq(substream);
2964 avail = snd_pcm_capture_avail(runtime);
2965 switch (runtime->status->state) {
2966 case SNDRV_PCM_STATE_RUNNING:
2967 case SNDRV_PCM_STATE_PREPARED:
2968 case SNDRV_PCM_STATE_PAUSED:
2969 if (avail >= runtime->control->avail_min) {
2970 mask = POLLIN | POLLRDNORM;
2971 break;
2972 }
2973 mask = 0;
2974 break;
2975 case SNDRV_PCM_STATE_DRAINING:
2976 if (avail > 0) {
2977 mask = POLLIN | POLLRDNORM;
2978 break;
2979 }
2980 /* Fall through */
2981 default:
2982 mask = POLLIN | POLLRDNORM | POLLERR;
2983 break;
2984 }
2985 snd_pcm_stream_unlock_irq(substream);
2986 return mask;
2987 }
2988
2989 /*
2990 * mmap support
2991 */
2992
2993 /*
2994 * Only on coherent architectures, we can mmap the status and the control records
2995 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2996 */
2997 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2998 /*
2999 * mmap status record
3000 */
3001 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3002 struct vm_fault *vmf)
3003 {
3004 struct snd_pcm_substream *substream = area->vm_private_data;
3005 struct snd_pcm_runtime *runtime;
3006
3007 if (substream == NULL)
3008 return VM_FAULT_SIGBUS;
3009 runtime = substream->runtime;
3010 vmf->page = virt_to_page(runtime->status);
3011 get_page(vmf->page);
3012 return 0;
3013 }
3014
3015 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3016 {
3017 .fault = snd_pcm_mmap_status_fault,
3018 };
3019
3020 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3021 struct vm_area_struct *area)
3022 {
3023 long size;
3024 if (!(area->vm_flags & VM_READ))
3025 return -EINVAL;
3026 size = area->vm_end - area->vm_start;
3027 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3028 return -EINVAL;
3029 area->vm_ops = &snd_pcm_vm_ops_status;
3030 area->vm_private_data = substream;
3031 area->vm_flags |= VM_RESERVED;
3032 return 0;
3033 }
3034
3035 /*
3036 * mmap control record
3037 */
3038 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3039 struct vm_fault *vmf)
3040 {
3041 struct snd_pcm_substream *substream = area->vm_private_data;
3042 struct snd_pcm_runtime *runtime;
3043
3044 if (substream == NULL)
3045 return VM_FAULT_SIGBUS;
3046 runtime = substream->runtime;
3047 vmf->page = virt_to_page(runtime->control);
3048 get_page(vmf->page);
3049 return 0;
3050 }
3051
3052 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3053 {
3054 .fault = snd_pcm_mmap_control_fault,
3055 };
3056
3057 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3058 struct vm_area_struct *area)
3059 {
3060 long size;
3061 if (!(area->vm_flags & VM_READ))
3062 return -EINVAL;
3063 size = area->vm_end - area->vm_start;
3064 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3065 return -EINVAL;
3066 area->vm_ops = &snd_pcm_vm_ops_control;
3067 area->vm_private_data = substream;
3068 area->vm_flags |= VM_RESERVED;
3069 return 0;
3070 }
3071 #else /* ! coherent mmap */
3072 /*
3073 * don't support mmap for status and control records.
3074 */
3075 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3076 struct vm_area_struct *area)
3077 {
3078 return -ENXIO;
3079 }
3080 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3081 struct vm_area_struct *area)
3082 {
3083 return -ENXIO;
3084 }
3085 #endif /* coherent mmap */
3086
3087 static inline struct page *
3088 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3089 {
3090 void *vaddr = substream->runtime->dma_area + ofs;
3091 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3092 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3093 return virt_to_page(CAC_ADDR(vaddr));
3094 #endif
3095 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3096 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3097 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3098 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3099 /* assume dma_handle set via pfn_to_phys() in
3100 * mm/dma-noncoherent.c
3101 */
3102 return pfn_to_page(addr >> PAGE_SHIFT);
3103 }
3104 #endif
3105 return virt_to_page(vaddr);
3106 }
3107
3108 /*
3109 * fault callback for mmapping a RAM page
3110 */
3111 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3112 struct vm_fault *vmf)
3113 {
3114 struct snd_pcm_substream *substream = area->vm_private_data;
3115 struct snd_pcm_runtime *runtime;
3116 unsigned long offset;
3117 struct page * page;
3118 size_t dma_bytes;
3119
3120 if (substream == NULL)
3121 return VM_FAULT_SIGBUS;
3122 runtime = substream->runtime;
3123 offset = vmf->pgoff << PAGE_SHIFT;
3124 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3125 if (offset > dma_bytes - PAGE_SIZE)
3126 return VM_FAULT_SIGBUS;
3127 if (substream->ops->page)
3128 page = substream->ops->page(substream, offset);
3129 else
3130 page = snd_pcm_default_page_ops(substream, offset);
3131 if (!page)
3132 return VM_FAULT_SIGBUS;
3133 get_page(page);
3134 vmf->page = page;
3135 return 0;
3136 }
3137
3138 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3139 .open = snd_pcm_mmap_data_open,
3140 .close = snd_pcm_mmap_data_close,
3141 };
3142
3143 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3144 .open = snd_pcm_mmap_data_open,
3145 .close = snd_pcm_mmap_data_close,
3146 .fault = snd_pcm_mmap_data_fault,
3147 };
3148
3149 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3150 /* This should be defined / handled globally! */
3151 #ifdef CONFIG_ARM
3152 #define ARCH_HAS_DMA_MMAP_COHERENT
3153 #endif
3154 #endif
3155
3156 /*
3157 * mmap the DMA buffer on RAM
3158 */
3159 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3160 struct vm_area_struct *area)
3161 {
3162 area->vm_flags |= VM_RESERVED;
3163 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3164 if (!substream->ops->page &&
3165 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3166 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3167 area,
3168 substream->runtime->dma_area,
3169 substream->runtime->dma_addr,
3170 area->vm_end - area->vm_start);
3171 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3172 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3173 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3174 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3175 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3176 /* mmap with fault handler */
3177 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3178 return 0;
3179 }
3180
3181 /*
3182 * mmap the DMA buffer on I/O memory area
3183 */
3184 #if SNDRV_PCM_INFO_MMAP_IOMEM
3185 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3186 struct vm_area_struct *area)
3187 {
3188 long size;
3189 unsigned long offset;
3190
3191 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3192 area->vm_flags |= VM_IO;
3193 size = area->vm_end - area->vm_start;
3194 offset = area->vm_pgoff << PAGE_SHIFT;
3195 if (io_remap_pfn_range(area, area->vm_start,
3196 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3197 size, area->vm_page_prot))
3198 return -EAGAIN;
3199 return 0;
3200 }
3201
3202 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3203 #endif /* SNDRV_PCM_INFO_MMAP */
3204
3205 /*
3206 * mmap DMA buffer
3207 */
3208 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3209 struct vm_area_struct *area)
3210 {
3211 struct snd_pcm_runtime *runtime;
3212 long size;
3213 unsigned long offset;
3214 size_t dma_bytes;
3215 int err;
3216
3217 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3218 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3219 return -EINVAL;
3220 } else {
3221 if (!(area->vm_flags & VM_READ))
3222 return -EINVAL;
3223 }
3224 runtime = substream->runtime;
3225 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3226 return -EBADFD;
3227 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3228 return -ENXIO;
3229 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3230 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3231 return -EINVAL;
3232 size = area->vm_end - area->vm_start;
3233 offset = area->vm_pgoff << PAGE_SHIFT;
3234 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3235 if ((size_t)size > dma_bytes)
3236 return -EINVAL;
3237 if (offset > dma_bytes - size)
3238 return -EINVAL;
3239
3240 area->vm_ops = &snd_pcm_vm_ops_data;
3241 area->vm_private_data = substream;
3242 if (substream->ops->mmap)
3243 err = substream->ops->mmap(substream, area);
3244 else
3245 err = snd_pcm_default_mmap(substream, area);
3246 if (!err)
3247 atomic_inc(&substream->mmap_count);
3248 return err;
3249 }
3250
3251 EXPORT_SYMBOL(snd_pcm_mmap_data);
3252
3253 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3254 {
3255 struct snd_pcm_file * pcm_file;
3256 struct snd_pcm_substream *substream;
3257 unsigned long offset;
3258
3259 pcm_file = file->private_data;
3260 substream = pcm_file->substream;
3261 if (PCM_RUNTIME_CHECK(substream))
3262 return -ENXIO;
3263
3264 offset = area->vm_pgoff << PAGE_SHIFT;
3265 switch (offset) {
3266 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3267 if (pcm_file->no_compat_mmap)
3268 return -ENXIO;
3269 return snd_pcm_mmap_status(substream, file, area);
3270 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3271 if (pcm_file->no_compat_mmap)
3272 return -ENXIO;
3273 return snd_pcm_mmap_control(substream, file, area);
3274 default:
3275 return snd_pcm_mmap_data(substream, file, area);
3276 }
3277 return 0;
3278 }
3279
3280 static int snd_pcm_fasync(int fd, struct file * file, int on)
3281 {
3282 struct snd_pcm_file * pcm_file;
3283 struct snd_pcm_substream *substream;
3284 struct snd_pcm_runtime *runtime;
3285
3286 pcm_file = file->private_data;
3287 substream = pcm_file->substream;
3288 if (PCM_RUNTIME_CHECK(substream))
3289 return -ENXIO;
3290 runtime = substream->runtime;
3291 return fasync_helper(fd, file, on, &runtime->fasync);
3292 }
3293
3294 /*
3295 * ioctl32 compat
3296 */
3297 #ifdef CONFIG_COMPAT
3298 #include "pcm_compat.c"
3299 #else
3300 #define snd_pcm_ioctl_compat NULL
3301 #endif
3302
3303 /*
3304 * To be removed helpers to keep binary compatibility
3305 */
3306
3307 #ifdef CONFIG_SND_SUPPORT_OLD_API
3308 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3309 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3310
3311 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3312 struct snd_pcm_hw_params_old *oparams)
3313 {
3314 unsigned int i;
3315
3316 memset(params, 0, sizeof(*params));
3317 params->flags = oparams->flags;
3318 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3319 params->masks[i].bits[0] = oparams->masks[i];
3320 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3321 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3322 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3323 params->info = oparams->info;
3324 params->msbits = oparams->msbits;
3325 params->rate_num = oparams->rate_num;
3326 params->rate_den = oparams->rate_den;
3327 params->fifo_size = oparams->fifo_size;
3328 }
3329
3330 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3331 struct snd_pcm_hw_params *params)
3332 {
3333 unsigned int i;
3334
3335 memset(oparams, 0, sizeof(*oparams));
3336 oparams->flags = params->flags;
3337 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3338 oparams->masks[i] = params->masks[i].bits[0];
3339 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3340 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3341 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3342 oparams->info = params->info;
3343 oparams->msbits = params->msbits;
3344 oparams->rate_num = params->rate_num;
3345 oparams->rate_den = params->rate_den;
3346 oparams->fifo_size = params->fifo_size;
3347 }
3348
3349 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3350 struct snd_pcm_hw_params_old __user * _oparams)
3351 {
3352 struct snd_pcm_hw_params *params;
3353 struct snd_pcm_hw_params_old *oparams = NULL;
3354 int err;
3355
3356 params = kmalloc(sizeof(*params), GFP_KERNEL);
3357 if (!params)
3358 return -ENOMEM;
3359
3360 oparams = memdup_user(_oparams, sizeof(*oparams));
3361 if (IS_ERR(oparams)) {
3362 err = PTR_ERR(oparams);
3363 goto out;
3364 }
3365 snd_pcm_hw_convert_from_old_params(params, oparams);
3366 err = snd_pcm_hw_refine(substream, params);
3367 snd_pcm_hw_convert_to_old_params(oparams, params);
3368 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3369 if (!err)
3370 err = -EFAULT;
3371 }
3372
3373 kfree(oparams);
3374 out:
3375 kfree(params);
3376 return err;
3377 }
3378
3379 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3380 struct snd_pcm_hw_params_old __user * _oparams)
3381 {
3382 struct snd_pcm_hw_params *params;
3383 struct snd_pcm_hw_params_old *oparams = NULL;
3384 int err;
3385
3386 params = kmalloc(sizeof(*params), GFP_KERNEL);
3387 if (!params)
3388 return -ENOMEM;
3389
3390 oparams = memdup_user(_oparams, sizeof(*oparams));
3391 if (IS_ERR(oparams)) {
3392 err = PTR_ERR(oparams);
3393 goto out;
3394 }
3395 snd_pcm_hw_convert_from_old_params(params, oparams);
3396 err = snd_pcm_hw_params(substream, params);
3397 snd_pcm_hw_convert_to_old_params(oparams, params);
3398 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3399 if (!err)
3400 err = -EFAULT;
3401 }
3402
3403 kfree(oparams);
3404 out:
3405 kfree(params);
3406 return err;
3407 }
3408 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3409
3410 #ifndef CONFIG_MMU
3411 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3412 unsigned long addr,
3413 unsigned long len,
3414 unsigned long pgoff,
3415 unsigned long flags)
3416 {
3417 struct snd_pcm_file *pcm_file = file->private_data;
3418 struct snd_pcm_substream *substream = pcm_file->substream;
3419 struct snd_pcm_runtime *runtime = substream->runtime;
3420 unsigned long offset = pgoff << PAGE_SHIFT;
3421
3422 switch (offset) {
3423 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3424 return (unsigned long)runtime->status;
3425 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3426 return (unsigned long)runtime->control;
3427 default:
3428 return (unsigned long)runtime->dma_area + offset;
3429 }
3430 }
3431 #else
3432 # define snd_pcm_get_unmapped_area NULL
3433 #endif
3434
3435 /*
3436 * Register section
3437 */
3438
3439 const struct file_operations snd_pcm_f_ops[2] = {
3440 {
3441 .owner = THIS_MODULE,
3442 .write = snd_pcm_write,
3443 .aio_write = snd_pcm_aio_write,
3444 .open = snd_pcm_playback_open,
3445 .release = snd_pcm_release,
3446 .llseek = no_llseek,
3447 .poll = snd_pcm_playback_poll,
3448 .unlocked_ioctl = snd_pcm_playback_ioctl,
3449 .compat_ioctl = snd_pcm_ioctl_compat,
3450 .mmap = snd_pcm_mmap,
3451 .fasync = snd_pcm_fasync,
3452 .get_unmapped_area = snd_pcm_get_unmapped_area,
3453 },
3454 {
3455 .owner = THIS_MODULE,
3456 .read = snd_pcm_read,
3457 .aio_read = snd_pcm_aio_read,
3458 .open = snd_pcm_capture_open,
3459 .release = snd_pcm_release,
3460 .llseek = no_llseek,
3461 .poll = snd_pcm_capture_poll,
3462 .unlocked_ioctl = snd_pcm_capture_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 };
kernel-based virtual machine