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ext4: fix xfstest generic/299 block validity failures
[linux/fpc-iii.git] / sound / core / pcm_native.c
blob01a5e05ede95cddbbcaa6be3ddb4bcf13e3786ce
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/mm.h>
23 #include <linux/module.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos.h>
28 #include <linux/aio.h>
29 #include <linux/dma-mapping.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/pcm.h>
34 #include <sound/pcm_params.h>
35 #include <sound/timer.h>
36 #include <sound/minors.h>
37 #include <asm/io.h>
38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
39 #include <dma-coherence.h>
40 #endif
41
42 /*
43 * Compatibility
44 */
45
46 struct snd_pcm_hw_params_old {
47 unsigned int flags;
48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
49 SNDRV_PCM_HW_PARAM_ACCESS + 1];
50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
52 unsigned int rmask;
53 unsigned int cmask;
54 unsigned int info;
55 unsigned int msbits;
56 unsigned int rate_num;
57 unsigned int rate_den;
58 snd_pcm_uframes_t fifo_size;
59 unsigned char reserved[64];
60 };
61
62 #ifdef CONFIG_SND_SUPPORT_OLD_API
63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
65
66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70 #endif
71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73 /*
74 *
75 */
76
77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
79
80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
81
82 static inline mm_segment_t snd_enter_user(void)
83 {
84 mm_segment_t fs = get_fs();
85 set_fs(get_ds());
86 return fs;
87 }
88
89 static inline void snd_leave_user(mm_segment_t fs)
90 {
91 set_fs(fs);
92 }
93
94
95
96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
97 {
98 struct snd_pcm_runtime *runtime;
99 struct snd_pcm *pcm = substream->pcm;
100 struct snd_pcm_str *pstr = substream->pstr;
101
102 memset(info, 0, sizeof(*info));
103 info->card = pcm->card->number;
104 info->device = pcm->device;
105 info->stream = substream->stream;
106 info->subdevice = substream->number;
107 strlcpy(info->id, pcm->id, sizeof(info->id));
108 strlcpy(info->name, pcm->name, sizeof(info->name));
109 info->dev_class = pcm->dev_class;
110 info->dev_subclass = pcm->dev_subclass;
111 info->subdevices_count = pstr->substream_count;
112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
113 strlcpy(info->subname, substream->name, sizeof(info->subname));
114 runtime = substream->runtime;
115 /* AB: FIXME!!! This is definitely nonsense */
116 if (runtime) {
117 info->sync = runtime->sync;
118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
119 }
120 return 0;
121 }
122
123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
124 struct snd_pcm_info __user * _info)
125 {
126 struct snd_pcm_info *info;
127 int err;
128
129 info = kmalloc(sizeof(*info), GFP_KERNEL);
130 if (! info)
131 return -ENOMEM;
132 err = snd_pcm_info(substream, info);
133 if (err >= 0) {
134 if (copy_to_user(_info, info, sizeof(*info)))
135 err = -EFAULT;
136 }
137 kfree(info);
138 return err;
139 }
140
141 #undef RULES_DEBUG
142
143 #ifdef RULES_DEBUG
144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
145 static const char * const snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161 };
162 #endif
163
164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166 {
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192 #ifdef RULES_DEBUG
193 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
194 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195 #endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197 #ifdef RULES_DEBUG
198 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199 #endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212 #ifdef RULES_DEBUG
213 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 printk("empty");
216 else
217 printk("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 printk(" -> ");
221 #endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223 #ifdef RULES_DEBUG
224 if (i->empty)
225 printk("empty\n");
226 else
227 printk("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230 #endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257 #ifdef RULES_DEBUG
258 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 printk("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 printk("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 printk("empty");
268 else
269 printk("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274 #endif
275 changed = r->func(params, r);
276 #ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 printk(" -> ");
279 if (hw_is_mask(r->var))
280 printk("%x", *m->bits);
281 else {
282 if (i->empty)
283 printk("empty");
284 else
285 printk("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 printk("\n");
291 #endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333 }
334
335 EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339 {
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355 }
356
357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
358 {
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370 }
371
372 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
373 {
374 snd_pcm_stream_lock_irq(substream);
375 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
376 substream->runtime->status->state = state;
377 snd_pcm_stream_unlock_irq(substream);
378 }
379
380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
381 struct snd_pcm_hw_params *params)
382 {
383 struct snd_pcm_runtime *runtime;
384 int err, usecs;
385 unsigned int bits;
386 snd_pcm_uframes_t frames;
387
388 if (PCM_RUNTIME_CHECK(substream))
389 return -ENXIO;
390 runtime = substream->runtime;
391 snd_pcm_stream_lock_irq(substream);
392 switch (runtime->status->state) {
393 case SNDRV_PCM_STATE_OPEN:
394 case SNDRV_PCM_STATE_SETUP:
395 case SNDRV_PCM_STATE_PREPARED:
396 break;
397 default:
398 snd_pcm_stream_unlock_irq(substream);
399 return -EBADFD;
400 }
401 snd_pcm_stream_unlock_irq(substream);
402 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
403 if (!substream->oss.oss)
404 #endif
405 if (atomic_read(&substream->mmap_count))
406 return -EBADFD;
407
408 params->rmask = ~0U;
409 err = snd_pcm_hw_refine(substream, params);
410 if (err < 0)
411 goto _error;
412
413 err = snd_pcm_hw_params_choose(substream, params);
414 if (err < 0)
415 goto _error;
416
417 if (substream->ops->hw_params != NULL) {
418 err = substream->ops->hw_params(substream, params);
419 if (err < 0)
420 goto _error;
421 }
422
423 runtime->access = params_access(params);
424 runtime->format = params_format(params);
425 runtime->subformat = params_subformat(params);
426 runtime->channels = params_channels(params);
427 runtime->rate = params_rate(params);
428 runtime->period_size = params_period_size(params);
429 runtime->periods = params_periods(params);
430 runtime->buffer_size = params_buffer_size(params);
431 runtime->info = params->info;
432 runtime->rate_num = params->rate_num;
433 runtime->rate_den = params->rate_den;
434 runtime->no_period_wakeup =
435 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
436 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
437
438 bits = snd_pcm_format_physical_width(runtime->format);
439 runtime->sample_bits = bits;
440 bits *= runtime->channels;
441 runtime->frame_bits = bits;
442 frames = 1;
443 while (bits % 8 != 0) {
444 bits *= 2;
445 frames *= 2;
446 }
447 runtime->byte_align = bits / 8;
448 runtime->min_align = frames;
449
450 /* Default sw params */
451 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
452 runtime->period_step = 1;
453 runtime->control->avail_min = runtime->period_size;
454 runtime->start_threshold = 1;
455 runtime->stop_threshold = runtime->buffer_size;
456 runtime->silence_threshold = 0;
457 runtime->silence_size = 0;
458 runtime->boundary = runtime->buffer_size;
459 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
460 runtime->boundary *= 2;
461
462 snd_pcm_timer_resolution_change(substream);
463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
464
465 if (pm_qos_request_active(&substream->latency_pm_qos_req))
466 pm_qos_remove_request(&substream->latency_pm_qos_req);
467 if ((usecs = period_to_usecs(runtime)) >= 0)
468 pm_qos_add_request(&substream->latency_pm_qos_req,
469 PM_QOS_CPU_DMA_LATENCY, usecs);
470 return 0;
471 _error:
472 /* hardware might be unusable from this time,
473 so we force application to retry to set
474 the correct hardware parameter settings */
475 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
476 if (substream->ops->hw_free != NULL)
477 substream->ops->hw_free(substream);
478 return err;
479 }
480
481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
482 struct snd_pcm_hw_params __user * _params)
483 {
484 struct snd_pcm_hw_params *params;
485 int err;
486
487 params = memdup_user(_params, sizeof(*params));
488 if (IS_ERR(params))
489 return PTR_ERR(params);
490
491 err = snd_pcm_hw_params(substream, params);
492 if (copy_to_user(_params, params, sizeof(*params))) {
493 if (!err)
494 err = -EFAULT;
495 }
496
497 kfree(params);
498 return err;
499 }
500
501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
502 {
503 struct snd_pcm_runtime *runtime;
504 int result = 0;
505
506 if (PCM_RUNTIME_CHECK(substream))
507 return -ENXIO;
508 runtime = substream->runtime;
509 snd_pcm_stream_lock_irq(substream);
510 switch (runtime->status->state) {
511 case SNDRV_PCM_STATE_SETUP:
512 case SNDRV_PCM_STATE_PREPARED:
513 break;
514 default:
515 snd_pcm_stream_unlock_irq(substream);
516 return -EBADFD;
517 }
518 snd_pcm_stream_unlock_irq(substream);
519 if (atomic_read(&substream->mmap_count))
520 return -EBADFD;
521 if (substream->ops->hw_free)
522 result = substream->ops->hw_free(substream);
523 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
524 pm_qos_remove_request(&substream->latency_pm_qos_req);
525 return result;
526 }
527
528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
529 struct snd_pcm_sw_params *params)
530 {
531 struct snd_pcm_runtime *runtime;
532 int err;
533
534 if (PCM_RUNTIME_CHECK(substream))
535 return -ENXIO;
536 runtime = substream->runtime;
537 snd_pcm_stream_lock_irq(substream);
538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
539 snd_pcm_stream_unlock_irq(substream);
540 return -EBADFD;
541 }
542 snd_pcm_stream_unlock_irq(substream);
543
544 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
545 return -EINVAL;
546 if (params->avail_min == 0)
547 return -EINVAL;
548 if (params->silence_size >= runtime->boundary) {
549 if (params->silence_threshold != 0)
550 return -EINVAL;
551 } else {
552 if (params->silence_size > params->silence_threshold)
553 return -EINVAL;
554 if (params->silence_threshold > runtime->buffer_size)
555 return -EINVAL;
556 }
557 err = 0;
558 snd_pcm_stream_lock_irq(substream);
559 runtime->tstamp_mode = params->tstamp_mode;
560 runtime->period_step = params->period_step;
561 runtime->control->avail_min = params->avail_min;
562 runtime->start_threshold = params->start_threshold;
563 runtime->stop_threshold = params->stop_threshold;
564 runtime->silence_threshold = params->silence_threshold;
565 runtime->silence_size = params->silence_size;
566 params->boundary = runtime->boundary;
567 if (snd_pcm_running(substream)) {
568 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
569 runtime->silence_size > 0)
570 snd_pcm_playback_silence(substream, ULONG_MAX);
571 err = snd_pcm_update_state(substream, runtime);
572 }
573 snd_pcm_stream_unlock_irq(substream);
574 return err;
575 }
576
577 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
578 struct snd_pcm_sw_params __user * _params)
579 {
580 struct snd_pcm_sw_params params;
581 int err;
582 if (copy_from_user(&params, _params, sizeof(params)))
583 return -EFAULT;
584 err = snd_pcm_sw_params(substream, &params);
585 if (copy_to_user(_params, &params, sizeof(params)))
586 return -EFAULT;
587 return err;
588 }
589
590 int snd_pcm_status(struct snd_pcm_substream *substream,
591 struct snd_pcm_status *status)
592 {
593 struct snd_pcm_runtime *runtime = substream->runtime;
594
595 snd_pcm_stream_lock_irq(substream);
596 status->state = runtime->status->state;
597 status->suspended_state = runtime->status->suspended_state;
598 if (status->state == SNDRV_PCM_STATE_OPEN)
599 goto _end;
600 status->trigger_tstamp = runtime->trigger_tstamp;
601 if (snd_pcm_running(substream)) {
602 snd_pcm_update_hw_ptr(substream);
603 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
604 status->tstamp = runtime->status->tstamp;
605 status->audio_tstamp =
606 runtime->status->audio_tstamp;
607 goto _tstamp_end;
608 }
609 }
610 snd_pcm_gettime(runtime, &status->tstamp);
611 _tstamp_end:
612 status->appl_ptr = runtime->control->appl_ptr;
613 status->hw_ptr = runtime->status->hw_ptr;
614 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
615 status->avail = snd_pcm_playback_avail(runtime);
616 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
617 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
618 status->delay = runtime->buffer_size - status->avail;
619 status->delay += runtime->delay;
620 } else
621 status->delay = 0;
622 } else {
623 status->avail = snd_pcm_capture_avail(runtime);
624 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
625 status->delay = status->avail + runtime->delay;
626 else
627 status->delay = 0;
628 }
629 status->avail_max = runtime->avail_max;
630 status->overrange = runtime->overrange;
631 runtime->avail_max = 0;
632 runtime->overrange = 0;
633 _end:
634 snd_pcm_stream_unlock_irq(substream);
635 return 0;
636 }
637
638 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
639 struct snd_pcm_status __user * _status)
640 {
641 struct snd_pcm_status status;
642 int res;
643
644 memset(&status, 0, sizeof(status));
645 res = snd_pcm_status(substream, &status);
646 if (res < 0)
647 return res;
648 if (copy_to_user(_status, &status, sizeof(status)))
649 return -EFAULT;
650 return 0;
651 }
652
653 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
654 struct snd_pcm_channel_info * info)
655 {
656 struct snd_pcm_runtime *runtime;
657 unsigned int channel;
658
659 channel = info->channel;
660 runtime = substream->runtime;
661 snd_pcm_stream_lock_irq(substream);
662 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
663 snd_pcm_stream_unlock_irq(substream);
664 return -EBADFD;
665 }
666 snd_pcm_stream_unlock_irq(substream);
667 if (channel >= runtime->channels)
668 return -EINVAL;
669 memset(info, 0, sizeof(*info));
670 info->channel = channel;
671 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
672 }
673
674 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
675 struct snd_pcm_channel_info __user * _info)
676 {
677 struct snd_pcm_channel_info info;
678 int res;
679
680 if (copy_from_user(&info, _info, sizeof(info)))
681 return -EFAULT;
682 res = snd_pcm_channel_info(substream, &info);
683 if (res < 0)
684 return res;
685 if (copy_to_user(_info, &info, sizeof(info)))
686 return -EFAULT;
687 return 0;
688 }
689
690 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
691 {
692 struct snd_pcm_runtime *runtime = substream->runtime;
693 if (runtime->trigger_master == NULL)
694 return;
695 if (runtime->trigger_master == substream) {
696 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
697 } else {
698 snd_pcm_trigger_tstamp(runtime->trigger_master);
699 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
700 }
701 runtime->trigger_master = NULL;
702 }
703
704 struct action_ops {
705 int (*pre_action)(struct snd_pcm_substream *substream, int state);
706 int (*do_action)(struct snd_pcm_substream *substream, int state);
707 void (*undo_action)(struct snd_pcm_substream *substream, int state);
708 void (*post_action)(struct snd_pcm_substream *substream, int state);
709 };
710
711 /*
712 * this functions is core for handling of linked stream
713 * Note: the stream state might be changed also on failure
714 * Note2: call with calling stream lock + link lock
715 */
716 static int snd_pcm_action_group(struct action_ops *ops,
717 struct snd_pcm_substream *substream,
718 int state, int do_lock)
719 {
720 struct snd_pcm_substream *s = NULL;
721 struct snd_pcm_substream *s1;
722 int res = 0;
723
724 snd_pcm_group_for_each_entry(s, substream) {
725 if (do_lock && s != substream)
726 spin_lock_nested(&s->self_group.lock,
727 SINGLE_DEPTH_NESTING);
728 res = ops->pre_action(s, state);
729 if (res < 0)
730 goto _unlock;
731 }
732 snd_pcm_group_for_each_entry(s, substream) {
733 res = ops->do_action(s, state);
734 if (res < 0) {
735 if (ops->undo_action) {
736 snd_pcm_group_for_each_entry(s1, substream) {
737 if (s1 == s) /* failed stream */
738 break;
739 ops->undo_action(s1, state);
740 }
741 }
742 s = NULL; /* unlock all */
743 goto _unlock;
744 }
745 }
746 snd_pcm_group_for_each_entry(s, substream) {
747 ops->post_action(s, state);
748 }
749 _unlock:
750 if (do_lock) {
751 /* unlock streams */
752 snd_pcm_group_for_each_entry(s1, substream) {
753 if (s1 != substream)
754 spin_unlock(&s1->self_group.lock);
755 if (s1 == s) /* end */
756 break;
757 }
758 }
759 return res;
760 }
761
762 /*
763 * Note: call with stream lock
764 */
765 static int snd_pcm_action_single(struct action_ops *ops,
766 struct snd_pcm_substream *substream,
767 int state)
768 {
769 int res;
770
771 res = ops->pre_action(substream, state);
772 if (res < 0)
773 return res;
774 res = ops->do_action(substream, state);
775 if (res == 0)
776 ops->post_action(substream, state);
777 else if (ops->undo_action)
778 ops->undo_action(substream, state);
779 return res;
780 }
781
782 /*
783 * Note: call with stream lock
784 */
785 static int snd_pcm_action(struct action_ops *ops,
786 struct snd_pcm_substream *substream,
787 int state)
788 {
789 int res;
790
791 if (snd_pcm_stream_linked(substream)) {
792 if (!spin_trylock(&substream->group->lock)) {
793 spin_unlock(&substream->self_group.lock);
794 spin_lock(&substream->group->lock);
795 spin_lock(&substream->self_group.lock);
796 }
797 res = snd_pcm_action_group(ops, substream, state, 1);
798 spin_unlock(&substream->group->lock);
799 } else {
800 res = snd_pcm_action_single(ops, substream, state);
801 }
802 return res;
803 }
804
805 /*
806 * Note: don't use any locks before
807 */
808 static int snd_pcm_action_lock_irq(struct action_ops *ops,
809 struct snd_pcm_substream *substream,
810 int state)
811 {
812 int res;
813
814 read_lock_irq(&snd_pcm_link_rwlock);
815 if (snd_pcm_stream_linked(substream)) {
816 spin_lock(&substream->group->lock);
817 spin_lock(&substream->self_group.lock);
818 res = snd_pcm_action_group(ops, substream, state, 1);
819 spin_unlock(&substream->self_group.lock);
820 spin_unlock(&substream->group->lock);
821 } else {
822 spin_lock(&substream->self_group.lock);
823 res = snd_pcm_action_single(ops, substream, state);
824 spin_unlock(&substream->self_group.lock);
825 }
826 read_unlock_irq(&snd_pcm_link_rwlock);
827 return res;
828 }
829
830 /*
831 */
832 static int snd_pcm_action_nonatomic(struct action_ops *ops,
833 struct snd_pcm_substream *substream,
834 int state)
835 {
836 int res;
837
838 down_read(&snd_pcm_link_rwsem);
839 if (snd_pcm_stream_linked(substream))
840 res = snd_pcm_action_group(ops, substream, state, 0);
841 else
842 res = snd_pcm_action_single(ops, substream, state);
843 up_read(&snd_pcm_link_rwsem);
844 return res;
845 }
846
847 /*
848 * start callbacks
849 */
850 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
851 {
852 struct snd_pcm_runtime *runtime = substream->runtime;
853 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
854 return -EBADFD;
855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
856 !snd_pcm_playback_data(substream))
857 return -EPIPE;
858 runtime->trigger_master = substream;
859 return 0;
860 }
861
862 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
863 {
864 if (substream->runtime->trigger_master != substream)
865 return 0;
866 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
867 }
868
869 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
870 {
871 if (substream->runtime->trigger_master == substream)
872 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
873 }
874
875 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
876 {
877 struct snd_pcm_runtime *runtime = substream->runtime;
878 snd_pcm_trigger_tstamp(substream);
879 runtime->hw_ptr_jiffies = jiffies;
880 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
881 runtime->rate;
882 runtime->status->state = state;
883 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
884 runtime->silence_size > 0)
885 snd_pcm_playback_silence(substream, ULONG_MAX);
886 if (substream->timer)
887 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
888 &runtime->trigger_tstamp);
889 }
890
891 static struct action_ops snd_pcm_action_start = {
892 .pre_action = snd_pcm_pre_start,
893 .do_action = snd_pcm_do_start,
894 .undo_action = snd_pcm_undo_start,
895 .post_action = snd_pcm_post_start
896 };
897
898 /**
899 * snd_pcm_start - start all linked streams
900 * @substream: the PCM substream instance
901 *
902 * Return: Zero if successful, or a negative error code.
903 */
904 int snd_pcm_start(struct snd_pcm_substream *substream)
905 {
906 return snd_pcm_action(&snd_pcm_action_start, substream,
907 SNDRV_PCM_STATE_RUNNING);
908 }
909
910 /*
911 * stop callbacks
912 */
913 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
914 {
915 struct snd_pcm_runtime *runtime = substream->runtime;
916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
917 return -EBADFD;
918 runtime->trigger_master = substream;
919 return 0;
920 }
921
922 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
923 {
924 if (substream->runtime->trigger_master == substream &&
925 snd_pcm_running(substream))
926 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
927 return 0; /* unconditonally stop all substreams */
928 }
929
930 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
931 {
932 struct snd_pcm_runtime *runtime = substream->runtime;
933 if (runtime->status->state != state) {
934 snd_pcm_trigger_tstamp(substream);
935 if (substream->timer)
936 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
937 &runtime->trigger_tstamp);
938 runtime->status->state = state;
939 }
940 wake_up(&runtime->sleep);
941 wake_up(&runtime->tsleep);
942 }
943
944 static struct action_ops snd_pcm_action_stop = {
945 .pre_action = snd_pcm_pre_stop,
946 .do_action = snd_pcm_do_stop,
947 .post_action = snd_pcm_post_stop
948 };
949
950 /**
951 * snd_pcm_stop - try to stop all running streams in the substream group
952 * @substream: the PCM substream instance
953 * @state: PCM state after stopping the stream
954 *
955 * The state of each stream is then changed to the given state unconditionally.
956 *
957 * Return: Zero if succesful, or a negative error code.
958 */
959 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
960 {
961 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
962 }
963
964 EXPORT_SYMBOL(snd_pcm_stop);
965
966 /**
967 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
968 * @substream: the PCM substream
969 *
970 * After stopping, the state is changed to SETUP.
971 * Unlike snd_pcm_stop(), this affects only the given stream.
972 *
973 * Return: Zero if succesful, or a negative error code.
974 */
975 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
976 {
977 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
978 SNDRV_PCM_STATE_SETUP);
979 }
980
981 /*
982 * pause callbacks
983 */
984 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
985 {
986 struct snd_pcm_runtime *runtime = substream->runtime;
987 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
988 return -ENOSYS;
989 if (push) {
990 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
991 return -EBADFD;
992 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
993 return -EBADFD;
994 runtime->trigger_master = substream;
995 return 0;
996 }
997
998 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
999 {
1000 if (substream->runtime->trigger_master != substream)
1001 return 0;
1002 /* some drivers might use hw_ptr to recover from the pause -
1003 update the hw_ptr now */
1004 if (push)
1005 snd_pcm_update_hw_ptr(substream);
1006 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1007 * a delta between the current jiffies, this gives a large enough
1008 * delta, effectively to skip the check once.
1009 */
1010 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1011 return substream->ops->trigger(substream,
1012 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1013 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1014 }
1015
1016 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1017 {
1018 if (substream->runtime->trigger_master == substream)
1019 substream->ops->trigger(substream,
1020 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1021 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1022 }
1023
1024 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1025 {
1026 struct snd_pcm_runtime *runtime = substream->runtime;
1027 snd_pcm_trigger_tstamp(substream);
1028 if (push) {
1029 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1030 if (substream->timer)
1031 snd_timer_notify(substream->timer,
1032 SNDRV_TIMER_EVENT_MPAUSE,
1033 &runtime->trigger_tstamp);
1034 wake_up(&runtime->sleep);
1035 wake_up(&runtime->tsleep);
1036 } else {
1037 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1038 if (substream->timer)
1039 snd_timer_notify(substream->timer,
1040 SNDRV_TIMER_EVENT_MCONTINUE,
1041 &runtime->trigger_tstamp);
1042 }
1043 }
1044
1045 static struct action_ops snd_pcm_action_pause = {
1046 .pre_action = snd_pcm_pre_pause,
1047 .do_action = snd_pcm_do_pause,
1048 .undo_action = snd_pcm_undo_pause,
1049 .post_action = snd_pcm_post_pause
1050 };
1051
1052 /*
1053 * Push/release the pause for all linked streams.
1054 */
1055 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1056 {
1057 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1058 }
1059
1060 #ifdef CONFIG_PM
1061 /* suspend */
1062
1063 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1064 {
1065 struct snd_pcm_runtime *runtime = substream->runtime;
1066 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1067 return -EBUSY;
1068 runtime->trigger_master = substream;
1069 return 0;
1070 }
1071
1072 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1073 {
1074 struct snd_pcm_runtime *runtime = substream->runtime;
1075 if (runtime->trigger_master != substream)
1076 return 0;
1077 if (! snd_pcm_running(substream))
1078 return 0;
1079 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1080 return 0; /* suspend unconditionally */
1081 }
1082
1083 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1084 {
1085 struct snd_pcm_runtime *runtime = substream->runtime;
1086 snd_pcm_trigger_tstamp(substream);
1087 if (substream->timer)
1088 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1089 &runtime->trigger_tstamp);
1090 runtime->status->suspended_state = runtime->status->state;
1091 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1092 wake_up(&runtime->sleep);
1093 wake_up(&runtime->tsleep);
1094 }
1095
1096 static struct action_ops snd_pcm_action_suspend = {
1097 .pre_action = snd_pcm_pre_suspend,
1098 .do_action = snd_pcm_do_suspend,
1099 .post_action = snd_pcm_post_suspend
1100 };
1101
1102 /**
1103 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1104 * @substream: the PCM substream
1105 *
1106 * After this call, all streams are changed to SUSPENDED state.
1107 *
1108 * Return: Zero if successful (or @substream is %NULL), or a negative error
1109 * code.
1110 */
1111 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1112 {
1113 int err;
1114 unsigned long flags;
1115
1116 if (! substream)
1117 return 0;
1118
1119 snd_pcm_stream_lock_irqsave(substream, flags);
1120 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1121 snd_pcm_stream_unlock_irqrestore(substream, flags);
1122 return err;
1123 }
1124
1125 EXPORT_SYMBOL(snd_pcm_suspend);
1126
1127 /**
1128 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1129 * @pcm: the PCM instance
1130 *
1131 * After this call, all streams are changed to SUSPENDED state.
1132 *
1133 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1134 */
1135 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1136 {
1137 struct snd_pcm_substream *substream;
1138 int stream, err = 0;
1139
1140 if (! pcm)
1141 return 0;
1142
1143 for (stream = 0; stream < 2; stream++) {
1144 for (substream = pcm->streams[stream].substream;
1145 substream; substream = substream->next) {
1146 /* FIXME: the open/close code should lock this as well */
1147 if (substream->runtime == NULL)
1148 continue;
1149 err = snd_pcm_suspend(substream);
1150 if (err < 0 && err != -EBUSY)
1151 return err;
1152 }
1153 }
1154 return 0;
1155 }
1156
1157 EXPORT_SYMBOL(snd_pcm_suspend_all);
1158
1159 /* resume */
1160
1161 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1162 {
1163 struct snd_pcm_runtime *runtime = substream->runtime;
1164 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1165 return -ENOSYS;
1166 runtime->trigger_master = substream;
1167 return 0;
1168 }
1169
1170 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1171 {
1172 struct snd_pcm_runtime *runtime = substream->runtime;
1173 if (runtime->trigger_master != substream)
1174 return 0;
1175 /* DMA not running previously? */
1176 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1177 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1178 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1179 return 0;
1180 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1181 }
1182
1183 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1184 {
1185 if (substream->runtime->trigger_master == substream &&
1186 snd_pcm_running(substream))
1187 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1188 }
1189
1190 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1191 {
1192 struct snd_pcm_runtime *runtime = substream->runtime;
1193 snd_pcm_trigger_tstamp(substream);
1194 if (substream->timer)
1195 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1196 &runtime->trigger_tstamp);
1197 runtime->status->state = runtime->status->suspended_state;
1198 }
1199
1200 static struct action_ops snd_pcm_action_resume = {
1201 .pre_action = snd_pcm_pre_resume,
1202 .do_action = snd_pcm_do_resume,
1203 .undo_action = snd_pcm_undo_resume,
1204 .post_action = snd_pcm_post_resume
1205 };
1206
1207 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1208 {
1209 struct snd_card *card = substream->pcm->card;
1210 int res;
1211
1212 snd_power_lock(card);
1213 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1214 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1215 snd_power_unlock(card);
1216 return res;
1217 }
1218
1219 #else
1220
1221 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1222 {
1223 return -ENOSYS;
1224 }
1225
1226 #endif /* CONFIG_PM */
1227
1228 /*
1229 * xrun ioctl
1230 *
1231 * Change the RUNNING stream(s) to XRUN state.
1232 */
1233 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1234 {
1235 struct snd_card *card = substream->pcm->card;
1236 struct snd_pcm_runtime *runtime = substream->runtime;
1237 int result;
1238
1239 snd_power_lock(card);
1240 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1241 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1242 if (result < 0)
1243 goto _unlock;
1244 }
1245
1246 snd_pcm_stream_lock_irq(substream);
1247 switch (runtime->status->state) {
1248 case SNDRV_PCM_STATE_XRUN:
1249 result = 0; /* already there */
1250 break;
1251 case SNDRV_PCM_STATE_RUNNING:
1252 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1253 break;
1254 default:
1255 result = -EBADFD;
1256 }
1257 snd_pcm_stream_unlock_irq(substream);
1258 _unlock:
1259 snd_power_unlock(card);
1260 return result;
1261 }
1262
1263 /*
1264 * reset ioctl
1265 */
1266 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1267 {
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 switch (runtime->status->state) {
1270 case SNDRV_PCM_STATE_RUNNING:
1271 case SNDRV_PCM_STATE_PREPARED:
1272 case SNDRV_PCM_STATE_PAUSED:
1273 case SNDRV_PCM_STATE_SUSPENDED:
1274 return 0;
1275 default:
1276 return -EBADFD;
1277 }
1278 }
1279
1280 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1281 {
1282 struct snd_pcm_runtime *runtime = substream->runtime;
1283 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1284 if (err < 0)
1285 return err;
1286 runtime->hw_ptr_base = 0;
1287 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1288 runtime->status->hw_ptr % runtime->period_size;
1289 runtime->silence_start = runtime->status->hw_ptr;
1290 runtime->silence_filled = 0;
1291 return 0;
1292 }
1293
1294 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1295 {
1296 struct snd_pcm_runtime *runtime = substream->runtime;
1297 runtime->control->appl_ptr = runtime->status->hw_ptr;
1298 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1299 runtime->silence_size > 0)
1300 snd_pcm_playback_silence(substream, ULONG_MAX);
1301 }
1302
1303 static struct action_ops snd_pcm_action_reset = {
1304 .pre_action = snd_pcm_pre_reset,
1305 .do_action = snd_pcm_do_reset,
1306 .post_action = snd_pcm_post_reset
1307 };
1308
1309 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1310 {
1311 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1312 }
1313
1314 /*
1315 * prepare ioctl
1316 */
1317 /* we use the second argument for updating f_flags */
1318 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1319 int f_flags)
1320 {
1321 struct snd_pcm_runtime *runtime = substream->runtime;
1322 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1323 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1324 return -EBADFD;
1325 if (snd_pcm_running(substream))
1326 return -EBUSY;
1327 substream->f_flags = f_flags;
1328 return 0;
1329 }
1330
1331 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1332 {
1333 int err;
1334 err = substream->ops->prepare(substream);
1335 if (err < 0)
1336 return err;
1337 return snd_pcm_do_reset(substream, 0);
1338 }
1339
1340 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1341 {
1342 struct snd_pcm_runtime *runtime = substream->runtime;
1343 runtime->control->appl_ptr = runtime->status->hw_ptr;
1344 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1345 }
1346
1347 static struct action_ops snd_pcm_action_prepare = {
1348 .pre_action = snd_pcm_pre_prepare,
1349 .do_action = snd_pcm_do_prepare,
1350 .post_action = snd_pcm_post_prepare
1351 };
1352
1353 /**
1354 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1355 * @substream: the PCM substream instance
1356 * @file: file to refer f_flags
1357 *
1358 * Return: Zero if successful, or a negative error code.
1359 */
1360 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1361 struct file *file)
1362 {
1363 int res;
1364 struct snd_card *card = substream->pcm->card;
1365 int f_flags;
1366
1367 if (file)
1368 f_flags = file->f_flags;
1369 else
1370 f_flags = substream->f_flags;
1371
1372 snd_power_lock(card);
1373 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1374 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1375 substream, f_flags);
1376 snd_power_unlock(card);
1377 return res;
1378 }
1379
1380 /*
1381 * drain ioctl
1382 */
1383
1384 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1385 {
1386 struct snd_pcm_runtime *runtime = substream->runtime;
1387 switch (runtime->status->state) {
1388 case SNDRV_PCM_STATE_OPEN:
1389 case SNDRV_PCM_STATE_DISCONNECTED:
1390 case SNDRV_PCM_STATE_SUSPENDED:
1391 return -EBADFD;
1392 }
1393 runtime->trigger_master = substream;
1394 return 0;
1395 }
1396
1397 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1398 {
1399 struct snd_pcm_runtime *runtime = substream->runtime;
1400 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1401 switch (runtime->status->state) {
1402 case SNDRV_PCM_STATE_PREPARED:
1403 /* start playback stream if possible */
1404 if (! snd_pcm_playback_empty(substream)) {
1405 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1406 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1407 }
1408 break;
1409 case SNDRV_PCM_STATE_RUNNING:
1410 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1411 break;
1412 case SNDRV_PCM_STATE_XRUN:
1413 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1414 break;
1415 default:
1416 break;
1417 }
1418 } else {
1419 /* stop running stream */
1420 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1421 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1422 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1423 snd_pcm_do_stop(substream, new_state);
1424 snd_pcm_post_stop(substream, new_state);
1425 }
1426 }
1427 return 0;
1428 }
1429
1430 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1431 {
1432 }
1433
1434 static struct action_ops snd_pcm_action_drain_init = {
1435 .pre_action = snd_pcm_pre_drain_init,
1436 .do_action = snd_pcm_do_drain_init,
1437 .post_action = snd_pcm_post_drain_init
1438 };
1439
1440 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1441
1442 /*
1443 * Drain the stream(s).
1444 * When the substream is linked, sync until the draining of all playback streams
1445 * is finished.
1446 * After this call, all streams are supposed to be either SETUP or DRAINING
1447 * (capture only) state.
1448 */
1449 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1450 struct file *file)
1451 {
1452 struct snd_card *card;
1453 struct snd_pcm_runtime *runtime;
1454 struct snd_pcm_substream *s;
1455 wait_queue_t wait;
1456 int result = 0;
1457 int nonblock = 0;
1458
1459 card = substream->pcm->card;
1460 runtime = substream->runtime;
1461
1462 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1463 return -EBADFD;
1464
1465 snd_power_lock(card);
1466 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1467 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1468 if (result < 0) {
1469 snd_power_unlock(card);
1470 return result;
1471 }
1472 }
1473
1474 if (file) {
1475 if (file->f_flags & O_NONBLOCK)
1476 nonblock = 1;
1477 } else if (substream->f_flags & O_NONBLOCK)
1478 nonblock = 1;
1479
1480 down_read(&snd_pcm_link_rwsem);
1481 snd_pcm_stream_lock_irq(substream);
1482 /* resume pause */
1483 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1484 snd_pcm_pause(substream, 0);
1485
1486 /* pre-start/stop - all running streams are changed to DRAINING state */
1487 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1488 if (result < 0)
1489 goto unlock;
1490 /* in non-blocking, we don't wait in ioctl but let caller poll */
1491 if (nonblock) {
1492 result = -EAGAIN;
1493 goto unlock;
1494 }
1495
1496 for (;;) {
1497 long tout;
1498 struct snd_pcm_runtime *to_check;
1499 if (signal_pending(current)) {
1500 result = -ERESTARTSYS;
1501 break;
1502 }
1503 /* find a substream to drain */
1504 to_check = NULL;
1505 snd_pcm_group_for_each_entry(s, substream) {
1506 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1507 continue;
1508 runtime = s->runtime;
1509 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1510 to_check = runtime;
1511 break;
1512 }
1513 }
1514 if (!to_check)
1515 break; /* all drained */
1516 init_waitqueue_entry(&wait, current);
1517 add_wait_queue(&to_check->sleep, &wait);
1518 snd_pcm_stream_unlock_irq(substream);
1519 up_read(&snd_pcm_link_rwsem);
1520 snd_power_unlock(card);
1521 if (runtime->no_period_wakeup)
1522 tout = MAX_SCHEDULE_TIMEOUT;
1523 else {
1524 tout = 10;
1525 if (runtime->rate) {
1526 long t = runtime->period_size * 2 / runtime->rate;
1527 tout = max(t, tout);
1528 }
1529 tout = msecs_to_jiffies(tout * 1000);
1530 }
1531 tout = schedule_timeout_interruptible(tout);
1532 snd_power_lock(card);
1533 down_read(&snd_pcm_link_rwsem);
1534 snd_pcm_stream_lock_irq(substream);
1535 remove_wait_queue(&to_check->sleep, &wait);
1536 if (card->shutdown) {
1537 result = -ENODEV;
1538 break;
1539 }
1540 if (tout == 0) {
1541 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1542 result = -ESTRPIPE;
1543 else {
1544 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1545 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1546 result = -EIO;
1547 }
1548 break;
1549 }
1550 }
1551
1552 unlock:
1553 snd_pcm_stream_unlock_irq(substream);
1554 up_read(&snd_pcm_link_rwsem);
1555 snd_power_unlock(card);
1556
1557 return result;
1558 }
1559
1560 /*
1561 * drop ioctl
1562 *
1563 * Immediately put all linked substreams into SETUP state.
1564 */
1565 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1566 {
1567 struct snd_pcm_runtime *runtime;
1568 int result = 0;
1569
1570 if (PCM_RUNTIME_CHECK(substream))
1571 return -ENXIO;
1572 runtime = substream->runtime;
1573
1574 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1575 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1576 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1577 return -EBADFD;
1578
1579 snd_pcm_stream_lock_irq(substream);
1580 /* resume pause */
1581 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1582 snd_pcm_pause(substream, 0);
1583
1584 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1585 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1586 snd_pcm_stream_unlock_irq(substream);
1587
1588 return result;
1589 }
1590
1591
1592 static bool is_pcm_file(struct file *file)
1593 {
1594 struct inode *inode = file_inode(file);
1595 unsigned int minor;
1596
1597 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1598 return false;
1599 minor = iminor(inode);
1600 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1601 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1602 }
1603
1604 /*
1605 * PCM link handling
1606 */
1607 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1608 {
1609 int res = 0;
1610 struct snd_pcm_file *pcm_file;
1611 struct snd_pcm_substream *substream1;
1612 struct snd_pcm_group *group;
1613 struct fd f = fdget(fd);
1614
1615 if (!f.file)
1616 return -EBADFD;
1617 if (!is_pcm_file(f.file)) {
1618 res = -EBADFD;
1619 goto _badf;
1620 }
1621 pcm_file = f.file->private_data;
1622 substream1 = pcm_file->substream;
1623 group = kmalloc(sizeof(*group), GFP_KERNEL);
1624 if (!group) {
1625 res = -ENOMEM;
1626 goto _nolock;
1627 }
1628 down_write(&snd_pcm_link_rwsem);
1629 write_lock_irq(&snd_pcm_link_rwlock);
1630 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1631 substream->runtime->status->state != substream1->runtime->status->state) {
1632 res = -EBADFD;
1633 goto _end;
1634 }
1635 if (snd_pcm_stream_linked(substream1)) {
1636 res = -EALREADY;
1637 goto _end;
1638 }
1639 if (!snd_pcm_stream_linked(substream)) {
1640 substream->group = group;
1641 group = NULL;
1642 spin_lock_init(&substream->group->lock);
1643 INIT_LIST_HEAD(&substream->group->substreams);
1644 list_add_tail(&substream->link_list, &substream->group->substreams);
1645 substream->group->count = 1;
1646 }
1647 list_add_tail(&substream1->link_list, &substream->group->substreams);
1648 substream->group->count++;
1649 substream1->group = substream->group;
1650 _end:
1651 write_unlock_irq(&snd_pcm_link_rwlock);
1652 up_write(&snd_pcm_link_rwsem);
1653 _nolock:
1654 snd_card_unref(substream1->pcm->card);
1655 kfree(group);
1656 _badf:
1657 fdput(f);
1658 return res;
1659 }
1660
1661 static void relink_to_local(struct snd_pcm_substream *substream)
1662 {
1663 substream->group = &substream->self_group;
1664 INIT_LIST_HEAD(&substream->self_group.substreams);
1665 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1666 }
1667
1668 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1669 {
1670 struct snd_pcm_substream *s;
1671 int res = 0;
1672
1673 down_write(&snd_pcm_link_rwsem);
1674 write_lock_irq(&snd_pcm_link_rwlock);
1675 if (!snd_pcm_stream_linked(substream)) {
1676 res = -EALREADY;
1677 goto _end;
1678 }
1679 list_del(&substream->link_list);
1680 substream->group->count--;
1681 if (substream->group->count == 1) { /* detach the last stream, too */
1682 snd_pcm_group_for_each_entry(s, substream) {
1683 relink_to_local(s);
1684 break;
1685 }
1686 kfree(substream->group);
1687 }
1688 relink_to_local(substream);
1689 _end:
1690 write_unlock_irq(&snd_pcm_link_rwlock);
1691 up_write(&snd_pcm_link_rwsem);
1692 return res;
1693 }
1694
1695 /*
1696 * hw configurator
1697 */
1698 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1699 struct snd_pcm_hw_rule *rule)
1700 {
1701 struct snd_interval t;
1702 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1703 hw_param_interval_c(params, rule->deps[1]), &t);
1704 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1705 }
1706
1707 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1708 struct snd_pcm_hw_rule *rule)
1709 {
1710 struct snd_interval t;
1711 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1712 hw_param_interval_c(params, rule->deps[1]), &t);
1713 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1714 }
1715
1716 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1717 struct snd_pcm_hw_rule *rule)
1718 {
1719 struct snd_interval t;
1720 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1721 hw_param_interval_c(params, rule->deps[1]),
1722 (unsigned long) rule->private, &t);
1723 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1724 }
1725
1726 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1727 struct snd_pcm_hw_rule *rule)
1728 {
1729 struct snd_interval t;
1730 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1731 (unsigned long) rule->private,
1732 hw_param_interval_c(params, rule->deps[1]), &t);
1733 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1734 }
1735
1736 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1737 struct snd_pcm_hw_rule *rule)
1738 {
1739 unsigned int k;
1740 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1741 struct snd_mask m;
1742 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1743 snd_mask_any(&m);
1744 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1745 int bits;
1746 if (! snd_mask_test(mask, k))
1747 continue;
1748 bits = snd_pcm_format_physical_width(k);
1749 if (bits <= 0)
1750 continue; /* ignore invalid formats */
1751 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1752 snd_mask_reset(&m, k);
1753 }
1754 return snd_mask_refine(mask, &m);
1755 }
1756
1757 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1758 struct snd_pcm_hw_rule *rule)
1759 {
1760 struct snd_interval t;
1761 unsigned int k;
1762 t.min = UINT_MAX;
1763 t.max = 0;
1764 t.openmin = 0;
1765 t.openmax = 0;
1766 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1767 int bits;
1768 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1769 continue;
1770 bits = snd_pcm_format_physical_width(k);
1771 if (bits <= 0)
1772 continue; /* ignore invalid formats */
1773 if (t.min > (unsigned)bits)
1774 t.min = bits;
1775 if (t.max < (unsigned)bits)
1776 t.max = bits;
1777 }
1778 t.integer = 1;
1779 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1780 }
1781
1782 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1783 #error "Change this table"
1784 #endif
1785
1786 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1787 48000, 64000, 88200, 96000, 176400, 192000 };
1788
1789 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1790 .count = ARRAY_SIZE(rates),
1791 .list = rates,
1792 };
1793
1794 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1795 struct snd_pcm_hw_rule *rule)
1796 {
1797 struct snd_pcm_hardware *hw = rule->private;
1798 return snd_interval_list(hw_param_interval(params, rule->var),
1799 snd_pcm_known_rates.count,
1800 snd_pcm_known_rates.list, hw->rates);
1801 }
1802
1803 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1804 struct snd_pcm_hw_rule *rule)
1805 {
1806 struct snd_interval t;
1807 struct snd_pcm_substream *substream = rule->private;
1808 t.min = 0;
1809 t.max = substream->buffer_bytes_max;
1810 t.openmin = 0;
1811 t.openmax = 0;
1812 t.integer = 1;
1813 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1814 }
1815
1816 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1817 {
1818 struct snd_pcm_runtime *runtime = substream->runtime;
1819 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1820 int k, err;
1821
1822 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1823 snd_mask_any(constrs_mask(constrs, k));
1824 }
1825
1826 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1827 snd_interval_any(constrs_interval(constrs, k));
1828 }
1829
1830 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1831 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1832 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1833 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1834 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1835
1836 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1837 snd_pcm_hw_rule_format, NULL,
1838 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1839 if (err < 0)
1840 return err;
1841 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1842 snd_pcm_hw_rule_sample_bits, NULL,
1843 SNDRV_PCM_HW_PARAM_FORMAT,
1844 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1845 if (err < 0)
1846 return err;
1847 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1848 snd_pcm_hw_rule_div, NULL,
1849 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1850 if (err < 0)
1851 return err;
1852 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1853 snd_pcm_hw_rule_mul, NULL,
1854 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1855 if (err < 0)
1856 return err;
1857 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1858 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1859 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1860 if (err < 0)
1861 return err;
1862 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1863 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1864 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1865 if (err < 0)
1866 return err;
1867 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1868 snd_pcm_hw_rule_div, NULL,
1869 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1870 if (err < 0)
1871 return err;
1872 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1873 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1874 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1875 if (err < 0)
1876 return err;
1877 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1878 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1879 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1880 if (err < 0)
1881 return err;
1882 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1883 snd_pcm_hw_rule_div, NULL,
1884 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1885 if (err < 0)
1886 return err;
1887 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1888 snd_pcm_hw_rule_div, NULL,
1889 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1890 if (err < 0)
1891 return err;
1892 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1893 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1894 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1895 if (err < 0)
1896 return err;
1897 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1898 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1899 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1900 if (err < 0)
1901 return err;
1902 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1903 snd_pcm_hw_rule_mul, NULL,
1904 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1905 if (err < 0)
1906 return err;
1907 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1908 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1909 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1910 if (err < 0)
1911 return err;
1912 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1913 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1914 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1915 if (err < 0)
1916 return err;
1917 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1918 snd_pcm_hw_rule_muldivk, (void*) 8,
1919 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1920 if (err < 0)
1921 return err;
1922 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1923 snd_pcm_hw_rule_muldivk, (void*) 8,
1924 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1925 if (err < 0)
1926 return err;
1927 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1928 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1929 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1930 if (err < 0)
1931 return err;
1932 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1933 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1934 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1935 if (err < 0)
1936 return err;
1937 return 0;
1938 }
1939
1940 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1941 {
1942 struct snd_pcm_runtime *runtime = substream->runtime;
1943 struct snd_pcm_hardware *hw = &runtime->hw;
1944 int err;
1945 unsigned int mask = 0;
1946
1947 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1948 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1949 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1950 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1951 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1952 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1953 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1954 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1955 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1956 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1957 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1958 }
1959 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1960 if (err < 0)
1961 return err;
1962
1963 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1964 if (err < 0)
1965 return err;
1966
1967 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1968 if (err < 0)
1969 return err;
1970
1971 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1972 hw->channels_min, hw->channels_max);
1973 if (err < 0)
1974 return err;
1975
1976 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1977 hw->rate_min, hw->rate_max);
1978 if (err < 0)
1979 return err;
1980
1981 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1982 hw->period_bytes_min, hw->period_bytes_max);
1983 if (err < 0)
1984 return err;
1985
1986 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1987 hw->periods_min, hw->periods_max);
1988 if (err < 0)
1989 return err;
1990
1991 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1992 hw->period_bytes_min, hw->buffer_bytes_max);
1993 if (err < 0)
1994 return err;
1995
1996 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1997 snd_pcm_hw_rule_buffer_bytes_max, substream,
1998 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1999 if (err < 0)
2000 return err;
2001
2002 /* FIXME: remove */
2003 if (runtime->dma_bytes) {
2004 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2005 if (err < 0)
2006 return err;
2007 }
2008
2009 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2010 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2011 snd_pcm_hw_rule_rate, hw,
2012 SNDRV_PCM_HW_PARAM_RATE, -1);
2013 if (err < 0)
2014 return err;
2015 }
2016
2017 /* FIXME: this belong to lowlevel */
2018 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2019
2020 return 0;
2021 }
2022
2023 static void pcm_release_private(struct snd_pcm_substream *substream)
2024 {
2025 snd_pcm_unlink(substream);
2026 }
2027
2028 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2029 {
2030 substream->ref_count--;
2031 if (substream->ref_count > 0)
2032 return;
2033
2034 snd_pcm_drop(substream);
2035 if (substream->hw_opened) {
2036 if (substream->ops->hw_free != NULL)
2037 substream->ops->hw_free(substream);
2038 substream->ops->close(substream);
2039 substream->hw_opened = 0;
2040 }
2041 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2042 pm_qos_remove_request(&substream->latency_pm_qos_req);
2043 if (substream->pcm_release) {
2044 substream->pcm_release(substream);
2045 substream->pcm_release = NULL;
2046 }
2047 snd_pcm_detach_substream(substream);
2048 }
2049
2050 EXPORT_SYMBOL(snd_pcm_release_substream);
2051
2052 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2053 struct file *file,
2054 struct snd_pcm_substream **rsubstream)
2055 {
2056 struct snd_pcm_substream *substream;
2057 int err;
2058
2059 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2060 if (err < 0)
2061 return err;
2062 if (substream->ref_count > 1) {
2063 *rsubstream = substream;
2064 return 0;
2065 }
2066
2067 err = snd_pcm_hw_constraints_init(substream);
2068 if (err < 0) {
2069 snd_printd("snd_pcm_hw_constraints_init failed\n");
2070 goto error;
2071 }
2072
2073 if ((err = substream->ops->open(substream)) < 0)
2074 goto error;
2075
2076 substream->hw_opened = 1;
2077
2078 err = snd_pcm_hw_constraints_complete(substream);
2079 if (err < 0) {
2080 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2081 goto error;
2082 }
2083
2084 *rsubstream = substream;
2085 return 0;
2086
2087 error:
2088 snd_pcm_release_substream(substream);
2089 return err;
2090 }
2091
2092 EXPORT_SYMBOL(snd_pcm_open_substream);
2093
2094 static int snd_pcm_open_file(struct file *file,
2095 struct snd_pcm *pcm,
2096 int stream)
2097 {
2098 struct snd_pcm_file *pcm_file;
2099 struct snd_pcm_substream *substream;
2100 int err;
2101
2102 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2103 if (err < 0)
2104 return err;
2105
2106 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2107 if (pcm_file == NULL) {
2108 snd_pcm_release_substream(substream);
2109 return -ENOMEM;
2110 }
2111 pcm_file->substream = substream;
2112 if (substream->ref_count == 1) {
2113 substream->file = pcm_file;
2114 substream->pcm_release = pcm_release_private;
2115 }
2116 file->private_data = pcm_file;
2117
2118 return 0;
2119 }
2120
2121 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2122 {
2123 struct snd_pcm *pcm;
2124 int err = nonseekable_open(inode, file);
2125 if (err < 0)
2126 return err;
2127 pcm = snd_lookup_minor_data(iminor(inode),
2128 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2129 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2130 if (pcm)
2131 snd_card_unref(pcm->card);
2132 return err;
2133 }
2134
2135 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2136 {
2137 struct snd_pcm *pcm;
2138 int err = nonseekable_open(inode, file);
2139 if (err < 0)
2140 return err;
2141 pcm = snd_lookup_minor_data(iminor(inode),
2142 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2143 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2144 if (pcm)
2145 snd_card_unref(pcm->card);
2146 return err;
2147 }
2148
2149 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2150 {
2151 int err;
2152 wait_queue_t wait;
2153
2154 if (pcm == NULL) {
2155 err = -ENODEV;
2156 goto __error1;
2157 }
2158 err = snd_card_file_add(pcm->card, file);
2159 if (err < 0)
2160 goto __error1;
2161 if (!try_module_get(pcm->card->module)) {
2162 err = -EFAULT;
2163 goto __error2;
2164 }
2165 init_waitqueue_entry(&wait, current);
2166 add_wait_queue(&pcm->open_wait, &wait);
2167 mutex_lock(&pcm->open_mutex);
2168 while (1) {
2169 err = snd_pcm_open_file(file, pcm, stream);
2170 if (err >= 0)
2171 break;
2172 if (err == -EAGAIN) {
2173 if (file->f_flags & O_NONBLOCK) {
2174 err = -EBUSY;
2175 break;
2176 }
2177 } else
2178 break;
2179 set_current_state(TASK_INTERRUPTIBLE);
2180 mutex_unlock(&pcm->open_mutex);
2181 schedule();
2182 mutex_lock(&pcm->open_mutex);
2183 if (pcm->card->shutdown) {
2184 err = -ENODEV;
2185 break;
2186 }
2187 if (signal_pending(current)) {
2188 err = -ERESTARTSYS;
2189 break;
2190 }
2191 }
2192 remove_wait_queue(&pcm->open_wait, &wait);
2193 mutex_unlock(&pcm->open_mutex);
2194 if (err < 0)
2195 goto __error;
2196 return err;
2197
2198 __error:
2199 module_put(pcm->card->module);
2200 __error2:
2201 snd_card_file_remove(pcm->card, file);
2202 __error1:
2203 return err;
2204 }
2205
2206 static int snd_pcm_release(struct inode *inode, struct file *file)
2207 {
2208 struct snd_pcm *pcm;
2209 struct snd_pcm_substream *substream;
2210 struct snd_pcm_file *pcm_file;
2211
2212 pcm_file = file->private_data;
2213 substream = pcm_file->substream;
2214 if (snd_BUG_ON(!substream))
2215 return -ENXIO;
2216 pcm = substream->pcm;
2217 mutex_lock(&pcm->open_mutex);
2218 snd_pcm_release_substream(substream);
2219 kfree(pcm_file);
2220 mutex_unlock(&pcm->open_mutex);
2221 wake_up(&pcm->open_wait);
2222 module_put(pcm->card->module);
2223 snd_card_file_remove(pcm->card, file);
2224 return 0;
2225 }
2226
2227 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2228 snd_pcm_uframes_t frames)
2229 {
2230 struct snd_pcm_runtime *runtime = substream->runtime;
2231 snd_pcm_sframes_t appl_ptr;
2232 snd_pcm_sframes_t ret;
2233 snd_pcm_sframes_t hw_avail;
2234
2235 if (frames == 0)
2236 return 0;
2237
2238 snd_pcm_stream_lock_irq(substream);
2239 switch (runtime->status->state) {
2240 case SNDRV_PCM_STATE_PREPARED:
2241 break;
2242 case SNDRV_PCM_STATE_DRAINING:
2243 case SNDRV_PCM_STATE_RUNNING:
2244 if (snd_pcm_update_hw_ptr(substream) >= 0)
2245 break;
2246 /* Fall through */
2247 case SNDRV_PCM_STATE_XRUN:
2248 ret = -EPIPE;
2249 goto __end;
2250 case SNDRV_PCM_STATE_SUSPENDED:
2251 ret = -ESTRPIPE;
2252 goto __end;
2253 default:
2254 ret = -EBADFD;
2255 goto __end;
2256 }
2257
2258 hw_avail = snd_pcm_playback_hw_avail(runtime);
2259 if (hw_avail <= 0) {
2260 ret = 0;
2261 goto __end;
2262 }
2263 if (frames > (snd_pcm_uframes_t)hw_avail)
2264 frames = hw_avail;
2265 appl_ptr = runtime->control->appl_ptr - frames;
2266 if (appl_ptr < 0)
2267 appl_ptr += runtime->boundary;
2268 runtime->control->appl_ptr = appl_ptr;
2269 ret = frames;
2270 __end:
2271 snd_pcm_stream_unlock_irq(substream);
2272 return ret;
2273 }
2274
2275 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2276 snd_pcm_uframes_t frames)
2277 {
2278 struct snd_pcm_runtime *runtime = substream->runtime;
2279 snd_pcm_sframes_t appl_ptr;
2280 snd_pcm_sframes_t ret;
2281 snd_pcm_sframes_t hw_avail;
2282
2283 if (frames == 0)
2284 return 0;
2285
2286 snd_pcm_stream_lock_irq(substream);
2287 switch (runtime->status->state) {
2288 case SNDRV_PCM_STATE_PREPARED:
2289 case SNDRV_PCM_STATE_DRAINING:
2290 break;
2291 case SNDRV_PCM_STATE_RUNNING:
2292 if (snd_pcm_update_hw_ptr(substream) >= 0)
2293 break;
2294 /* Fall through */
2295 case SNDRV_PCM_STATE_XRUN:
2296 ret = -EPIPE;
2297 goto __end;
2298 case SNDRV_PCM_STATE_SUSPENDED:
2299 ret = -ESTRPIPE;
2300 goto __end;
2301 default:
2302 ret = -EBADFD;
2303 goto __end;
2304 }
2305
2306 hw_avail = snd_pcm_capture_hw_avail(runtime);
2307 if (hw_avail <= 0) {
2308 ret = 0;
2309 goto __end;
2310 }
2311 if (frames > (snd_pcm_uframes_t)hw_avail)
2312 frames = hw_avail;
2313 appl_ptr = runtime->control->appl_ptr - frames;
2314 if (appl_ptr < 0)
2315 appl_ptr += runtime->boundary;
2316 runtime->control->appl_ptr = appl_ptr;
2317 ret = frames;
2318 __end:
2319 snd_pcm_stream_unlock_irq(substream);
2320 return ret;
2321 }
2322
2323 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2324 snd_pcm_uframes_t frames)
2325 {
2326 struct snd_pcm_runtime *runtime = substream->runtime;
2327 snd_pcm_sframes_t appl_ptr;
2328 snd_pcm_sframes_t ret;
2329 snd_pcm_sframes_t avail;
2330
2331 if (frames == 0)
2332 return 0;
2333
2334 snd_pcm_stream_lock_irq(substream);
2335 switch (runtime->status->state) {
2336 case SNDRV_PCM_STATE_PREPARED:
2337 case SNDRV_PCM_STATE_PAUSED:
2338 break;
2339 case SNDRV_PCM_STATE_DRAINING:
2340 case SNDRV_PCM_STATE_RUNNING:
2341 if (snd_pcm_update_hw_ptr(substream) >= 0)
2342 break;
2343 /* Fall through */
2344 case SNDRV_PCM_STATE_XRUN:
2345 ret = -EPIPE;
2346 goto __end;
2347 case SNDRV_PCM_STATE_SUSPENDED:
2348 ret = -ESTRPIPE;
2349 goto __end;
2350 default:
2351 ret = -EBADFD;
2352 goto __end;
2353 }
2354
2355 avail = snd_pcm_playback_avail(runtime);
2356 if (avail <= 0) {
2357 ret = 0;
2358 goto __end;
2359 }
2360 if (frames > (snd_pcm_uframes_t)avail)
2361 frames = avail;
2362 appl_ptr = runtime->control->appl_ptr + frames;
2363 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2364 appl_ptr -= runtime->boundary;
2365 runtime->control->appl_ptr = appl_ptr;
2366 ret = frames;
2367 __end:
2368 snd_pcm_stream_unlock_irq(substream);
2369 return ret;
2370 }
2371
2372 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2373 snd_pcm_uframes_t frames)
2374 {
2375 struct snd_pcm_runtime *runtime = substream->runtime;
2376 snd_pcm_sframes_t appl_ptr;
2377 snd_pcm_sframes_t ret;
2378 snd_pcm_sframes_t avail;
2379
2380 if (frames == 0)
2381 return 0;
2382
2383 snd_pcm_stream_lock_irq(substream);
2384 switch (runtime->status->state) {
2385 case SNDRV_PCM_STATE_PREPARED:
2386 case SNDRV_PCM_STATE_DRAINING:
2387 case SNDRV_PCM_STATE_PAUSED:
2388 break;
2389 case SNDRV_PCM_STATE_RUNNING:
2390 if (snd_pcm_update_hw_ptr(substream) >= 0)
2391 break;
2392 /* Fall through */
2393 case SNDRV_PCM_STATE_XRUN:
2394 ret = -EPIPE;
2395 goto __end;
2396 case SNDRV_PCM_STATE_SUSPENDED:
2397 ret = -ESTRPIPE;
2398 goto __end;
2399 default:
2400 ret = -EBADFD;
2401 goto __end;
2402 }
2403
2404 avail = snd_pcm_capture_avail(runtime);
2405 if (avail <= 0) {
2406 ret = 0;
2407 goto __end;
2408 }
2409 if (frames > (snd_pcm_uframes_t)avail)
2410 frames = avail;
2411 appl_ptr = runtime->control->appl_ptr + frames;
2412 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2413 appl_ptr -= runtime->boundary;
2414 runtime->control->appl_ptr = appl_ptr;
2415 ret = frames;
2416 __end:
2417 snd_pcm_stream_unlock_irq(substream);
2418 return ret;
2419 }
2420
2421 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2422 {
2423 struct snd_pcm_runtime *runtime = substream->runtime;
2424 int err;
2425
2426 snd_pcm_stream_lock_irq(substream);
2427 switch (runtime->status->state) {
2428 case SNDRV_PCM_STATE_DRAINING:
2429 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2430 goto __badfd;
2431 /* Fall through */
2432 case SNDRV_PCM_STATE_RUNNING:
2433 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2434 break;
2435 /* Fall through */
2436 case SNDRV_PCM_STATE_PREPARED:
2437 case SNDRV_PCM_STATE_SUSPENDED:
2438 err = 0;
2439 break;
2440 case SNDRV_PCM_STATE_XRUN:
2441 err = -EPIPE;
2442 break;
2443 default:
2444 __badfd:
2445 err = -EBADFD;
2446 break;
2447 }
2448 snd_pcm_stream_unlock_irq(substream);
2449 return err;
2450 }
2451
2452 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2453 snd_pcm_sframes_t __user *res)
2454 {
2455 struct snd_pcm_runtime *runtime = substream->runtime;
2456 int err;
2457 snd_pcm_sframes_t n = 0;
2458
2459 snd_pcm_stream_lock_irq(substream);
2460 switch (runtime->status->state) {
2461 case SNDRV_PCM_STATE_DRAINING:
2462 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2463 goto __badfd;
2464 /* Fall through */
2465 case SNDRV_PCM_STATE_RUNNING:
2466 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2467 break;
2468 /* Fall through */
2469 case SNDRV_PCM_STATE_PREPARED:
2470 case SNDRV_PCM_STATE_SUSPENDED:
2471 err = 0;
2472 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2473 n = snd_pcm_playback_hw_avail(runtime);
2474 else
2475 n = snd_pcm_capture_avail(runtime);
2476 n += runtime->delay;
2477 break;
2478 case SNDRV_PCM_STATE_XRUN:
2479 err = -EPIPE;
2480 break;
2481 default:
2482 __badfd:
2483 err = -EBADFD;
2484 break;
2485 }
2486 snd_pcm_stream_unlock_irq(substream);
2487 if (!err)
2488 if (put_user(n, res))
2489 err = -EFAULT;
2490 return err;
2491 }
2492
2493 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2494 struct snd_pcm_sync_ptr __user *_sync_ptr)
2495 {
2496 struct snd_pcm_runtime *runtime = substream->runtime;
2497 struct snd_pcm_sync_ptr sync_ptr;
2498 volatile struct snd_pcm_mmap_status *status;
2499 volatile struct snd_pcm_mmap_control *control;
2500 int err;
2501
2502 memset(&sync_ptr, 0, sizeof(sync_ptr));
2503 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2504 return -EFAULT;
2505 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2506 return -EFAULT;
2507 status = runtime->status;
2508 control = runtime->control;
2509 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2510 err = snd_pcm_hwsync(substream);
2511 if (err < 0)
2512 return err;
2513 }
2514 snd_pcm_stream_lock_irq(substream);
2515 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2516 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2517 else
2518 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2519 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2520 control->avail_min = sync_ptr.c.control.avail_min;
2521 else
2522 sync_ptr.c.control.avail_min = control->avail_min;
2523 sync_ptr.s.status.state = status->state;
2524 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2525 sync_ptr.s.status.tstamp = status->tstamp;
2526 sync_ptr.s.status.suspended_state = status->suspended_state;
2527 snd_pcm_stream_unlock_irq(substream);
2528 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2529 return -EFAULT;
2530 return 0;
2531 }
2532
2533 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2534 {
2535 struct snd_pcm_runtime *runtime = substream->runtime;
2536 int arg;
2537
2538 if (get_user(arg, _arg))
2539 return -EFAULT;
2540 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2541 return -EINVAL;
2542 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2543 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2544 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2545 return 0;
2546 }
2547
2548 static int snd_pcm_common_ioctl1(struct file *file,
2549 struct snd_pcm_substream *substream,
2550 unsigned int cmd, void __user *arg)
2551 {
2552 switch (cmd) {
2553 case SNDRV_PCM_IOCTL_PVERSION:
2554 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2555 case SNDRV_PCM_IOCTL_INFO:
2556 return snd_pcm_info_user(substream, arg);
2557 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2558 return 0;
2559 case SNDRV_PCM_IOCTL_TTSTAMP:
2560 return snd_pcm_tstamp(substream, arg);
2561 case SNDRV_PCM_IOCTL_HW_REFINE:
2562 return snd_pcm_hw_refine_user(substream, arg);
2563 case SNDRV_PCM_IOCTL_HW_PARAMS:
2564 return snd_pcm_hw_params_user(substream, arg);
2565 case SNDRV_PCM_IOCTL_HW_FREE:
2566 return snd_pcm_hw_free(substream);
2567 case SNDRV_PCM_IOCTL_SW_PARAMS:
2568 return snd_pcm_sw_params_user(substream, arg);
2569 case SNDRV_PCM_IOCTL_STATUS:
2570 return snd_pcm_status_user(substream, arg);
2571 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2572 return snd_pcm_channel_info_user(substream, arg);
2573 case SNDRV_PCM_IOCTL_PREPARE:
2574 return snd_pcm_prepare(substream, file);
2575 case SNDRV_PCM_IOCTL_RESET:
2576 return snd_pcm_reset(substream);
2577 case SNDRV_PCM_IOCTL_START:
2578 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2579 case SNDRV_PCM_IOCTL_LINK:
2580 return snd_pcm_link(substream, (int)(unsigned long) arg);
2581 case SNDRV_PCM_IOCTL_UNLINK:
2582 return snd_pcm_unlink(substream);
2583 case SNDRV_PCM_IOCTL_RESUME:
2584 return snd_pcm_resume(substream);
2585 case SNDRV_PCM_IOCTL_XRUN:
2586 return snd_pcm_xrun(substream);
2587 case SNDRV_PCM_IOCTL_HWSYNC:
2588 return snd_pcm_hwsync(substream);
2589 case SNDRV_PCM_IOCTL_DELAY:
2590 return snd_pcm_delay(substream, arg);
2591 case SNDRV_PCM_IOCTL_SYNC_PTR:
2592 return snd_pcm_sync_ptr(substream, arg);
2593 #ifdef CONFIG_SND_SUPPORT_OLD_API
2594 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2595 return snd_pcm_hw_refine_old_user(substream, arg);
2596 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2597 return snd_pcm_hw_params_old_user(substream, arg);
2598 #endif
2599 case SNDRV_PCM_IOCTL_DRAIN:
2600 return snd_pcm_drain(substream, file);
2601 case SNDRV_PCM_IOCTL_DROP:
2602 return snd_pcm_drop(substream);
2603 case SNDRV_PCM_IOCTL_PAUSE:
2604 {
2605 int res;
2606 snd_pcm_stream_lock_irq(substream);
2607 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2608 snd_pcm_stream_unlock_irq(substream);
2609 return res;
2610 }
2611 }
2612 snd_printd("unknown ioctl = 0x%x\n", cmd);
2613 return -ENOTTY;
2614 }
2615
2616 static int snd_pcm_playback_ioctl1(struct file *file,
2617 struct snd_pcm_substream *substream,
2618 unsigned int cmd, void __user *arg)
2619 {
2620 if (snd_BUG_ON(!substream))
2621 return -ENXIO;
2622 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2623 return -EINVAL;
2624 switch (cmd) {
2625 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2626 {
2627 struct snd_xferi xferi;
2628 struct snd_xferi __user *_xferi = arg;
2629 struct snd_pcm_runtime *runtime = substream->runtime;
2630 snd_pcm_sframes_t result;
2631 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2632 return -EBADFD;
2633 if (put_user(0, &_xferi->result))
2634 return -EFAULT;
2635 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2636 return -EFAULT;
2637 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2638 __put_user(result, &_xferi->result);
2639 return result < 0 ? result : 0;
2640 }
2641 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2642 {
2643 struct snd_xfern xfern;
2644 struct snd_xfern __user *_xfern = arg;
2645 struct snd_pcm_runtime *runtime = substream->runtime;
2646 void __user **bufs;
2647 snd_pcm_sframes_t result;
2648 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2649 return -EBADFD;
2650 if (runtime->channels > 128)
2651 return -EINVAL;
2652 if (put_user(0, &_xfern->result))
2653 return -EFAULT;
2654 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2655 return -EFAULT;
2656
2657 bufs = memdup_user(xfern.bufs,
2658 sizeof(void *) * runtime->channels);
2659 if (IS_ERR(bufs))
2660 return PTR_ERR(bufs);
2661 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2662 kfree(bufs);
2663 __put_user(result, &_xfern->result);
2664 return result < 0 ? result : 0;
2665 }
2666 case SNDRV_PCM_IOCTL_REWIND:
2667 {
2668 snd_pcm_uframes_t frames;
2669 snd_pcm_uframes_t __user *_frames = arg;
2670 snd_pcm_sframes_t result;
2671 if (get_user(frames, _frames))
2672 return -EFAULT;
2673 if (put_user(0, _frames))
2674 return -EFAULT;
2675 result = snd_pcm_playback_rewind(substream, frames);
2676 __put_user(result, _frames);
2677 return result < 0 ? result : 0;
2678 }
2679 case SNDRV_PCM_IOCTL_FORWARD:
2680 {
2681 snd_pcm_uframes_t frames;
2682 snd_pcm_uframes_t __user *_frames = arg;
2683 snd_pcm_sframes_t result;
2684 if (get_user(frames, _frames))
2685 return -EFAULT;
2686 if (put_user(0, _frames))
2687 return -EFAULT;
2688 result = snd_pcm_playback_forward(substream, frames);
2689 __put_user(result, _frames);
2690 return result < 0 ? result : 0;
2691 }
2692 }
2693 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2694 }
2695
2696 static int snd_pcm_capture_ioctl1(struct file *file,
2697 struct snd_pcm_substream *substream,
2698 unsigned int cmd, void __user *arg)
2699 {
2700 if (snd_BUG_ON(!substream))
2701 return -ENXIO;
2702 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2703 return -EINVAL;
2704 switch (cmd) {
2705 case SNDRV_PCM_IOCTL_READI_FRAMES:
2706 {
2707 struct snd_xferi xferi;
2708 struct snd_xferi __user *_xferi = arg;
2709 struct snd_pcm_runtime *runtime = substream->runtime;
2710 snd_pcm_sframes_t result;
2711 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2712 return -EBADFD;
2713 if (put_user(0, &_xferi->result))
2714 return -EFAULT;
2715 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2716 return -EFAULT;
2717 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2718 __put_user(result, &_xferi->result);
2719 return result < 0 ? result : 0;
2720 }
2721 case SNDRV_PCM_IOCTL_READN_FRAMES:
2722 {
2723 struct snd_xfern xfern;
2724 struct snd_xfern __user *_xfern = arg;
2725 struct snd_pcm_runtime *runtime = substream->runtime;
2726 void *bufs;
2727 snd_pcm_sframes_t result;
2728 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2729 return -EBADFD;
2730 if (runtime->channels > 128)
2731 return -EINVAL;
2732 if (put_user(0, &_xfern->result))
2733 return -EFAULT;
2734 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2735 return -EFAULT;
2736
2737 bufs = memdup_user(xfern.bufs,
2738 sizeof(void *) * runtime->channels);
2739 if (IS_ERR(bufs))
2740 return PTR_ERR(bufs);
2741 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2742 kfree(bufs);
2743 __put_user(result, &_xfern->result);
2744 return result < 0 ? result : 0;
2745 }
2746 case SNDRV_PCM_IOCTL_REWIND:
2747 {
2748 snd_pcm_uframes_t frames;
2749 snd_pcm_uframes_t __user *_frames = arg;
2750 snd_pcm_sframes_t result;
2751 if (get_user(frames, _frames))
2752 return -EFAULT;
2753 if (put_user(0, _frames))
2754 return -EFAULT;
2755 result = snd_pcm_capture_rewind(substream, frames);
2756 __put_user(result, _frames);
2757 return result < 0 ? result : 0;
2758 }
2759 case SNDRV_PCM_IOCTL_FORWARD:
2760 {
2761 snd_pcm_uframes_t frames;
2762 snd_pcm_uframes_t __user *_frames = arg;
2763 snd_pcm_sframes_t result;
2764 if (get_user(frames, _frames))
2765 return -EFAULT;
2766 if (put_user(0, _frames))
2767 return -EFAULT;
2768 result = snd_pcm_capture_forward(substream, frames);
2769 __put_user(result, _frames);
2770 return result < 0 ? result : 0;
2771 }
2772 }
2773 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2774 }
2775
2776 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2777 unsigned long arg)
2778 {
2779 struct snd_pcm_file *pcm_file;
2780
2781 pcm_file = file->private_data;
2782
2783 if (((cmd >> 8) & 0xff) != 'A')
2784 return -ENOTTY;
2785
2786 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2787 (void __user *)arg);
2788 }
2789
2790 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2791 unsigned long arg)
2792 {
2793 struct snd_pcm_file *pcm_file;
2794
2795 pcm_file = file->private_data;
2796
2797 if (((cmd >> 8) & 0xff) != 'A')
2798 return -ENOTTY;
2799
2800 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2801 (void __user *)arg);
2802 }
2803
2804 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2805 unsigned int cmd, void *arg)
2806 {
2807 mm_segment_t fs;
2808 int result;
2809
2810 fs = snd_enter_user();
2811 switch (substream->stream) {
2812 case SNDRV_PCM_STREAM_PLAYBACK:
2813 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2814 (void __user *)arg);
2815 break;
2816 case SNDRV_PCM_STREAM_CAPTURE:
2817 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2818 (void __user *)arg);
2819 break;
2820 default:
2821 result = -EINVAL;
2822 break;
2823 }
2824 snd_leave_user(fs);
2825 return result;
2826 }
2827
2828 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2829
2830 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2831 loff_t * offset)
2832 {
2833 struct snd_pcm_file *pcm_file;
2834 struct snd_pcm_substream *substream;
2835 struct snd_pcm_runtime *runtime;
2836 snd_pcm_sframes_t result;
2837
2838 pcm_file = file->private_data;
2839 substream = pcm_file->substream;
2840 if (PCM_RUNTIME_CHECK(substream))
2841 return -ENXIO;
2842 runtime = substream->runtime;
2843 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2844 return -EBADFD;
2845 if (!frame_aligned(runtime, count))
2846 return -EINVAL;
2847 count = bytes_to_frames(runtime, count);
2848 result = snd_pcm_lib_read(substream, buf, count);
2849 if (result > 0)
2850 result = frames_to_bytes(runtime, result);
2851 return result;
2852 }
2853
2854 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2855 size_t count, loff_t * offset)
2856 {
2857 struct snd_pcm_file *pcm_file;
2858 struct snd_pcm_substream *substream;
2859 struct snd_pcm_runtime *runtime;
2860 snd_pcm_sframes_t result;
2861
2862 pcm_file = file->private_data;
2863 substream = pcm_file->substream;
2864 if (PCM_RUNTIME_CHECK(substream))
2865 return -ENXIO;
2866 runtime = substream->runtime;
2867 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2868 return -EBADFD;
2869 if (!frame_aligned(runtime, count))
2870 return -EINVAL;
2871 count = bytes_to_frames(runtime, count);
2872 result = snd_pcm_lib_write(substream, buf, count);
2873 if (result > 0)
2874 result = frames_to_bytes(runtime, result);
2875 return result;
2876 }
2877
2878 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2879 unsigned long nr_segs, loff_t pos)
2880
2881 {
2882 struct snd_pcm_file *pcm_file;
2883 struct snd_pcm_substream *substream;
2884 struct snd_pcm_runtime *runtime;
2885 snd_pcm_sframes_t result;
2886 unsigned long i;
2887 void __user **bufs;
2888 snd_pcm_uframes_t frames;
2889
2890 pcm_file = iocb->ki_filp->private_data;
2891 substream = pcm_file->substream;
2892 if (PCM_RUNTIME_CHECK(substream))
2893 return -ENXIO;
2894 runtime = substream->runtime;
2895 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2896 return -EBADFD;
2897 if (nr_segs > 1024 || nr_segs != runtime->channels)
2898 return -EINVAL;
2899 if (!frame_aligned(runtime, iov->iov_len))
2900 return -EINVAL;
2901 frames = bytes_to_samples(runtime, iov->iov_len);
2902 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2903 if (bufs == NULL)
2904 return -ENOMEM;
2905 for (i = 0; i < nr_segs; ++i)
2906 bufs[i] = iov[i].iov_base;
2907 result = snd_pcm_lib_readv(substream, bufs, frames);
2908 if (result > 0)
2909 result = frames_to_bytes(runtime, result);
2910 kfree(bufs);
2911 return result;
2912 }
2913
2914 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2915 unsigned long nr_segs, loff_t pos)
2916 {
2917 struct snd_pcm_file *pcm_file;
2918 struct snd_pcm_substream *substream;
2919 struct snd_pcm_runtime *runtime;
2920 snd_pcm_sframes_t result;
2921 unsigned long i;
2922 void __user **bufs;
2923 snd_pcm_uframes_t frames;
2924
2925 pcm_file = iocb->ki_filp->private_data;
2926 substream = pcm_file->substream;
2927 if (PCM_RUNTIME_CHECK(substream))
2928 return -ENXIO;
2929 runtime = substream->runtime;
2930 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2931 return -EBADFD;
2932 if (nr_segs > 128 || nr_segs != runtime->channels ||
2933 !frame_aligned(runtime, iov->iov_len))
2934 return -EINVAL;
2935 frames = bytes_to_samples(runtime, iov->iov_len);
2936 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2937 if (bufs == NULL)
2938 return -ENOMEM;
2939 for (i = 0; i < nr_segs; ++i)
2940 bufs[i] = iov[i].iov_base;
2941 result = snd_pcm_lib_writev(substream, bufs, frames);
2942 if (result > 0)
2943 result = frames_to_bytes(runtime, result);
2944 kfree(bufs);
2945 return result;
2946 }
2947
2948 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2949 {
2950 struct snd_pcm_file *pcm_file;
2951 struct snd_pcm_substream *substream;
2952 struct snd_pcm_runtime *runtime;
2953 unsigned int mask;
2954 snd_pcm_uframes_t avail;
2955
2956 pcm_file = file->private_data;
2957
2958 substream = pcm_file->substream;
2959 if (PCM_RUNTIME_CHECK(substream))
2960 return -ENXIO;
2961 runtime = substream->runtime;
2962
2963 poll_wait(file, &runtime->sleep, wait);
2964
2965 snd_pcm_stream_lock_irq(substream);
2966 avail = snd_pcm_playback_avail(runtime);
2967 switch (runtime->status->state) {
2968 case SNDRV_PCM_STATE_RUNNING:
2969 case SNDRV_PCM_STATE_PREPARED:
2970 case SNDRV_PCM_STATE_PAUSED:
2971 if (avail >= runtime->control->avail_min) {
2972 mask = POLLOUT | POLLWRNORM;
2973 break;
2974 }
2975 /* Fall through */
2976 case SNDRV_PCM_STATE_DRAINING:
2977 mask = 0;
2978 break;
2979 default:
2980 mask = POLLOUT | POLLWRNORM | POLLERR;
2981 break;
2982 }
2983 snd_pcm_stream_unlock_irq(substream);
2984 return mask;
2985 }
2986
2987 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2988 {
2989 struct snd_pcm_file *pcm_file;
2990 struct snd_pcm_substream *substream;
2991 struct snd_pcm_runtime *runtime;
2992 unsigned int mask;
2993 snd_pcm_uframes_t avail;
2994
2995 pcm_file = file->private_data;
2996
2997 substream = pcm_file->substream;
2998 if (PCM_RUNTIME_CHECK(substream))
2999 return -ENXIO;
3000 runtime = substream->runtime;
3001
3002 poll_wait(file, &runtime->sleep, wait);
3003
3004 snd_pcm_stream_lock_irq(substream);
3005 avail = snd_pcm_capture_avail(runtime);
3006 switch (runtime->status->state) {
3007 case SNDRV_PCM_STATE_RUNNING:
3008 case SNDRV_PCM_STATE_PREPARED:
3009 case SNDRV_PCM_STATE_PAUSED:
3010 if (avail >= runtime->control->avail_min) {
3011 mask = POLLIN | POLLRDNORM;
3012 break;
3013 }
3014 mask = 0;
3015 break;
3016 case SNDRV_PCM_STATE_DRAINING:
3017 if (avail > 0) {
3018 mask = POLLIN | POLLRDNORM;
3019 break;
3020 }
3021 /* Fall through */
3022 default:
3023 mask = POLLIN | POLLRDNORM | POLLERR;
3024 break;
3025 }
3026 snd_pcm_stream_unlock_irq(substream);
3027 return mask;
3028 }
3029
3030 /*
3031 * mmap support
3032 */
3033
3034 /*
3035 * Only on coherent architectures, we can mmap the status and the control records
3036 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3037 */
3038 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3039 /*
3040 * mmap status record
3041 */
3042 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3043 struct vm_fault *vmf)
3044 {
3045 struct snd_pcm_substream *substream = area->vm_private_data;
3046 struct snd_pcm_runtime *runtime;
3047
3048 if (substream == NULL)
3049 return VM_FAULT_SIGBUS;
3050 runtime = substream->runtime;
3051 vmf->page = virt_to_page(runtime->status);
3052 get_page(vmf->page);
3053 return 0;
3054 }
3055
3056 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3057 {
3058 .fault = snd_pcm_mmap_status_fault,
3059 };
3060
3061 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3062 struct vm_area_struct *area)
3063 {
3064 long size;
3065 if (!(area->vm_flags & VM_READ))
3066 return -EINVAL;
3067 size = area->vm_end - area->vm_start;
3068 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3069 return -EINVAL;
3070 area->vm_ops = &snd_pcm_vm_ops_status;
3071 area->vm_private_data = substream;
3072 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3073 return 0;
3074 }
3075
3076 /*
3077 * mmap control record
3078 */
3079 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3080 struct vm_fault *vmf)
3081 {
3082 struct snd_pcm_substream *substream = area->vm_private_data;
3083 struct snd_pcm_runtime *runtime;
3084
3085 if (substream == NULL)
3086 return VM_FAULT_SIGBUS;
3087 runtime = substream->runtime;
3088 vmf->page = virt_to_page(runtime->control);
3089 get_page(vmf->page);
3090 return 0;
3091 }
3092
3093 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3094 {
3095 .fault = snd_pcm_mmap_control_fault,
3096 };
3097
3098 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3099 struct vm_area_struct *area)
3100 {
3101 long size;
3102 if (!(area->vm_flags & VM_READ))
3103 return -EINVAL;
3104 size = area->vm_end - area->vm_start;
3105 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3106 return -EINVAL;
3107 area->vm_ops = &snd_pcm_vm_ops_control;
3108 area->vm_private_data = substream;
3109 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3110 return 0;
3111 }
3112 #else /* ! coherent mmap */
3113 /*
3114 * don't support mmap for status and control records.
3115 */
3116 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3117 struct vm_area_struct *area)
3118 {
3119 return -ENXIO;
3120 }
3121 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3122 struct vm_area_struct *area)
3123 {
3124 return -ENXIO;
3125 }
3126 #endif /* coherent mmap */
3127
3128 static inline struct page *
3129 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3130 {
3131 void *vaddr = substream->runtime->dma_area + ofs;
3132 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3133 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3134 return virt_to_page(CAC_ADDR(vaddr));
3135 #endif
3136 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3137 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3138 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3139 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3140 /* assume dma_handle set via pfn_to_phys() in
3141 * mm/dma-noncoherent.c
3142 */
3143 return pfn_to_page(addr >> PAGE_SHIFT);
3144 }
3145 #endif
3146 return virt_to_page(vaddr);
3147 }
3148
3149 /*
3150 * fault callback for mmapping a RAM page
3151 */
3152 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3153 struct vm_fault *vmf)
3154 {
3155 struct snd_pcm_substream *substream = area->vm_private_data;
3156 struct snd_pcm_runtime *runtime;
3157 unsigned long offset;
3158 struct page * page;
3159 size_t dma_bytes;
3160
3161 if (substream == NULL)
3162 return VM_FAULT_SIGBUS;
3163 runtime = substream->runtime;
3164 offset = vmf->pgoff << PAGE_SHIFT;
3165 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3166 if (offset > dma_bytes - PAGE_SIZE)
3167 return VM_FAULT_SIGBUS;
3168 if (substream->ops->page)
3169 page = substream->ops->page(substream, offset);
3170 else
3171 page = snd_pcm_default_page_ops(substream, offset);
3172 if (!page)
3173 return VM_FAULT_SIGBUS;
3174 get_page(page);
3175 vmf->page = page;
3176 return 0;
3177 }
3178
3179 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3180 .open = snd_pcm_mmap_data_open,
3181 .close = snd_pcm_mmap_data_close,
3182 };
3183
3184 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3185 .open = snd_pcm_mmap_data_open,
3186 .close = snd_pcm_mmap_data_close,
3187 .fault = snd_pcm_mmap_data_fault,
3188 };
3189
3190 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3191 /* This should be defined / handled globally! */
3192 #ifdef CONFIG_ARM
3193 #define ARCH_HAS_DMA_MMAP_COHERENT
3194 #endif
3195 #endif
3196
3197 /*
3198 * mmap the DMA buffer on RAM
3199 */
3200 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3201 struct vm_area_struct *area)
3202 {
3203 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3204 #ifdef CONFIG_GENERIC_ALLOCATOR
3205 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3206 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3207 return remap_pfn_range(area, area->vm_start,
3208 substream->dma_buffer.addr >> PAGE_SHIFT,
3209 area->vm_end - area->vm_start, area->vm_page_prot);
3210 }
3211 #endif /* CONFIG_GENERIC_ALLOCATOR */
3212 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3213 if (!substream->ops->page &&
3214 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3215 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3216 area,
3217 substream->runtime->dma_area,
3218 substream->runtime->dma_addr,
3219 area->vm_end - area->vm_start);
3220 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3221 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3222 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3223 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3224 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3225 /* mmap with fault handler */
3226 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3227 return 0;
3228 }
3229 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3230
3231 /*
3232 * mmap the DMA buffer on I/O memory area
3233 */
3234 #if SNDRV_PCM_INFO_MMAP_IOMEM
3235 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3236 struct vm_area_struct *area)
3237 {
3238 struct snd_pcm_runtime *runtime = substream->runtime;;
3239
3240 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3241 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3242 }
3243
3244 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3245 #endif /* SNDRV_PCM_INFO_MMAP */
3246
3247 /*
3248 * mmap DMA buffer
3249 */
3250 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3251 struct vm_area_struct *area)
3252 {
3253 struct snd_pcm_runtime *runtime;
3254 long size;
3255 unsigned long offset;
3256 size_t dma_bytes;
3257 int err;
3258
3259 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3260 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3261 return -EINVAL;
3262 } else {
3263 if (!(area->vm_flags & VM_READ))
3264 return -EINVAL;
3265 }
3266 runtime = substream->runtime;
3267 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3268 return -EBADFD;
3269 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3270 return -ENXIO;
3271 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3272 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3273 return -EINVAL;
3274 size = area->vm_end - area->vm_start;
3275 offset = area->vm_pgoff << PAGE_SHIFT;
3276 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3277 if ((size_t)size > dma_bytes)
3278 return -EINVAL;
3279 if (offset > dma_bytes - size)
3280 return -EINVAL;
3281
3282 area->vm_ops = &snd_pcm_vm_ops_data;
3283 area->vm_private_data = substream;
3284 if (substream->ops->mmap)
3285 err = substream->ops->mmap(substream, area);
3286 else
3287 err = snd_pcm_lib_default_mmap(substream, area);
3288 if (!err)
3289 atomic_inc(&substream->mmap_count);
3290 return err;
3291 }
3292
3293 EXPORT_SYMBOL(snd_pcm_mmap_data);
3294
3295 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3296 {
3297 struct snd_pcm_file * pcm_file;
3298 struct snd_pcm_substream *substream;
3299 unsigned long offset;
3300
3301 pcm_file = file->private_data;
3302 substream = pcm_file->substream;
3303 if (PCM_RUNTIME_CHECK(substream))
3304 return -ENXIO;
3305
3306 offset = area->vm_pgoff << PAGE_SHIFT;
3307 switch (offset) {
3308 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3309 if (pcm_file->no_compat_mmap)
3310 return -ENXIO;
3311 return snd_pcm_mmap_status(substream, file, area);
3312 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3313 if (pcm_file->no_compat_mmap)
3314 return -ENXIO;
3315 return snd_pcm_mmap_control(substream, file, area);
3316 default:
3317 return snd_pcm_mmap_data(substream, file, area);
3318 }
3319 return 0;
3320 }
3321
3322 static int snd_pcm_fasync(int fd, struct file * file, int on)
3323 {
3324 struct snd_pcm_file * pcm_file;
3325 struct snd_pcm_substream *substream;
3326 struct snd_pcm_runtime *runtime;
3327
3328 pcm_file = file->private_data;
3329 substream = pcm_file->substream;
3330 if (PCM_RUNTIME_CHECK(substream))
3331 return -ENXIO;
3332 runtime = substream->runtime;
3333 return fasync_helper(fd, file, on, &runtime->fasync);
3334 }
3335
3336 /*
3337 * ioctl32 compat
3338 */
3339 #ifdef CONFIG_COMPAT
3340 #include "pcm_compat.c"
3341 #else
3342 #define snd_pcm_ioctl_compat NULL
3343 #endif
3344
3345 /*
3346 * To be removed helpers to keep binary compatibility
3347 */
3348
3349 #ifdef CONFIG_SND_SUPPORT_OLD_API
3350 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3351 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3352
3353 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3354 struct snd_pcm_hw_params_old *oparams)
3355 {
3356 unsigned int i;
3357
3358 memset(params, 0, sizeof(*params));
3359 params->flags = oparams->flags;
3360 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3361 params->masks[i].bits[0] = oparams->masks[i];
3362 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3363 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3364 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3365 params->info = oparams->info;
3366 params->msbits = oparams->msbits;
3367 params->rate_num = oparams->rate_num;
3368 params->rate_den = oparams->rate_den;
3369 params->fifo_size = oparams->fifo_size;
3370 }
3371
3372 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3373 struct snd_pcm_hw_params *params)
3374 {
3375 unsigned int i;
3376
3377 memset(oparams, 0, sizeof(*oparams));
3378 oparams->flags = params->flags;
3379 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3380 oparams->masks[i] = params->masks[i].bits[0];
3381 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3382 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3383 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3384 oparams->info = params->info;
3385 oparams->msbits = params->msbits;
3386 oparams->rate_num = params->rate_num;
3387 oparams->rate_den = params->rate_den;
3388 oparams->fifo_size = params->fifo_size;
3389 }
3390
3391 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3392 struct snd_pcm_hw_params_old __user * _oparams)
3393 {
3394 struct snd_pcm_hw_params *params;
3395 struct snd_pcm_hw_params_old *oparams = NULL;
3396 int err;
3397
3398 params = kmalloc(sizeof(*params), GFP_KERNEL);
3399 if (!params)
3400 return -ENOMEM;
3401
3402 oparams = memdup_user(_oparams, sizeof(*oparams));
3403 if (IS_ERR(oparams)) {
3404 err = PTR_ERR(oparams);
3405 goto out;
3406 }
3407 snd_pcm_hw_convert_from_old_params(params, oparams);
3408 err = snd_pcm_hw_refine(substream, params);
3409 snd_pcm_hw_convert_to_old_params(oparams, params);
3410 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3411 if (!err)
3412 err = -EFAULT;
3413 }
3414
3415 kfree(oparams);
3416 out:
3417 kfree(params);
3418 return err;
3419 }
3420
3421 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3422 struct snd_pcm_hw_params_old __user * _oparams)
3423 {
3424 struct snd_pcm_hw_params *params;
3425 struct snd_pcm_hw_params_old *oparams = NULL;
3426 int err;
3427
3428 params = kmalloc(sizeof(*params), GFP_KERNEL);
3429 if (!params)
3430 return -ENOMEM;
3431
3432 oparams = memdup_user(_oparams, sizeof(*oparams));
3433 if (IS_ERR(oparams)) {
3434 err = PTR_ERR(oparams);
3435 goto out;
3436 }
3437 snd_pcm_hw_convert_from_old_params(params, oparams);
3438 err = snd_pcm_hw_params(substream, params);
3439 snd_pcm_hw_convert_to_old_params(oparams, params);
3440 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3441 if (!err)
3442 err = -EFAULT;
3443 }
3444
3445 kfree(oparams);
3446 out:
3447 kfree(params);
3448 return err;
3449 }
3450 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3451
3452 #ifndef CONFIG_MMU
3453 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3454 unsigned long addr,
3455 unsigned long len,
3456 unsigned long pgoff,
3457 unsigned long flags)
3458 {
3459 struct snd_pcm_file *pcm_file = file->private_data;
3460 struct snd_pcm_substream *substream = pcm_file->substream;
3461 struct snd_pcm_runtime *runtime = substream->runtime;
3462 unsigned long offset = pgoff << PAGE_SHIFT;
3463
3464 switch (offset) {
3465 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3466 return (unsigned long)runtime->status;
3467 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3468 return (unsigned long)runtime->control;
3469 default:
3470 return (unsigned long)runtime->dma_area + offset;
3471 }
3472 }
3473 #else
3474 # define snd_pcm_get_unmapped_area NULL
3475 #endif
3476
3477 /*
3478 * Register section
3479 */
3480
3481 const struct file_operations snd_pcm_f_ops[2] = {
3482 {
3483 .owner = THIS_MODULE,
3484 .write = snd_pcm_write,
3485 .aio_write = snd_pcm_aio_write,
3486 .open = snd_pcm_playback_open,
3487 .release = snd_pcm_release,
3488 .llseek = no_llseek,
3489 .poll = snd_pcm_playback_poll,
3490 .unlocked_ioctl = snd_pcm_playback_ioctl,
3491 .compat_ioctl = snd_pcm_ioctl_compat,
3492 .mmap = snd_pcm_mmap,
3493 .fasync = snd_pcm_fasync,
3494 .get_unmapped_area = snd_pcm_get_unmapped_area,
3495 },
3496 {
3497 .owner = THIS_MODULE,
3498 .read = snd_pcm_read,
3499 .aio_read = snd_pcm_aio_read,
3500 .open = snd_pcm_capture_open,
3501 .release = snd_pcm_release,
3502 .llseek = no_llseek,
3503 .poll = snd_pcm_capture_poll,
3504 .unlocked_ioctl = snd_pcm_capture_ioctl,
3505 .compat_ioctl = snd_pcm_ioctl_compat,
3506 .mmap = snd_pcm_mmap,
3507 .fasync = snd_pcm_fasync,
3508 .get_unmapped_area = snd_pcm_get_unmapped_area,
3509 }
3510 };
Linux with added FPC-III support