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ALSA: PCM: Fix some races at disconnection
[linux/fpc-iii.git] / sound / core / pcm_native.c
blob8753c89f329043dd71968d5a344d2a8acf959502
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/mm.h>
23 #include <linux/module.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos.h>
28 #include <linux/uio.h>
29 #include <linux/dma-mapping.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/pcm.h>
34 #include <sound/pcm_params.h>
35 #include <sound/timer.h>
36 #include <sound/minors.h>
37 #include <asm/io.h>
38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
39 #include <dma-coherence.h>
40 #endif
41
42 /*
43 * Compatibility
44 */
45
46 struct snd_pcm_hw_params_old {
47 unsigned int flags;
48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
49 SNDRV_PCM_HW_PARAM_ACCESS + 1];
50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
52 unsigned int rmask;
53 unsigned int cmask;
54 unsigned int info;
55 unsigned int msbits;
56 unsigned int rate_num;
57 unsigned int rate_den;
58 snd_pcm_uframes_t fifo_size;
59 unsigned char reserved[64];
60 };
61
62 #ifdef CONFIG_SND_SUPPORT_OLD_API
63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
65
66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70 #endif
71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73 /*
74 *
75 */
76
77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
79
80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
81
82 static inline mm_segment_t snd_enter_user(void)
83 {
84 mm_segment_t fs = get_fs();
85 set_fs(get_ds());
86 return fs;
87 }
88
89 static inline void snd_leave_user(mm_segment_t fs)
90 {
91 set_fs(fs);
92 }
93
94
95
96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
97 {
98 struct snd_pcm_runtime *runtime;
99 struct snd_pcm *pcm = substream->pcm;
100 struct snd_pcm_str *pstr = substream->pstr;
101
102 memset(info, 0, sizeof(*info));
103 info->card = pcm->card->number;
104 info->device = pcm->device;
105 info->stream = substream->stream;
106 info->subdevice = substream->number;
107 strlcpy(info->id, pcm->id, sizeof(info->id));
108 strlcpy(info->name, pcm->name, sizeof(info->name));
109 info->dev_class = pcm->dev_class;
110 info->dev_subclass = pcm->dev_subclass;
111 info->subdevices_count = pstr->substream_count;
112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
113 strlcpy(info->subname, substream->name, sizeof(info->subname));
114 runtime = substream->runtime;
115 /* AB: FIXME!!! This is definitely nonsense */
116 if (runtime) {
117 info->sync = runtime->sync;
118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
119 }
120 return 0;
121 }
122
123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
124 struct snd_pcm_info __user * _info)
125 {
126 struct snd_pcm_info *info;
127 int err;
128
129 info = kmalloc(sizeof(*info), GFP_KERNEL);
130 if (! info)
131 return -ENOMEM;
132 err = snd_pcm_info(substream, info);
133 if (err >= 0) {
134 if (copy_to_user(_info, info, sizeof(*info)))
135 err = -EFAULT;
136 }
137 kfree(info);
138 return err;
139 }
140
141 #undef RULES_DEBUG
142
143 #ifdef RULES_DEBUG
144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
145 static const char * const snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161 };
162 #endif
163
164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166 {
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192 #ifdef RULES_DEBUG
193 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
194 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195 #endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197 #ifdef RULES_DEBUG
198 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199 #endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212 #ifdef RULES_DEBUG
213 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 printk("empty");
216 else
217 printk("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 printk(" -> ");
221 #endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223 #ifdef RULES_DEBUG
224 if (i->empty)
225 printk("empty\n");
226 else
227 printk("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230 #endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257 #ifdef RULES_DEBUG
258 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 printk("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 printk("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 printk("empty");
268 else
269 printk("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274 #endif
275 changed = r->func(params, r);
276 #ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 printk(" -> ");
279 if (hw_is_mask(r->var))
280 printk("%x", *m->bits);
281 else {
282 if (i->empty)
283 printk("empty");
284 else
285 printk("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 printk("\n");
291 #endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333 }
334
335 EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339 {
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355 }
356
357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
358 {
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370 }
371
372 static 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 goto _tstamp_end;
606 }
607 }
608 snd_pcm_gettime(runtime, &status->tstamp);
609 _tstamp_end:
610 status->appl_ptr = runtime->control->appl_ptr;
611 status->hw_ptr = runtime->status->hw_ptr;
612 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
613 status->avail = snd_pcm_playback_avail(runtime);
614 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
615 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
616 status->delay = runtime->buffer_size - status->avail;
617 status->delay += runtime->delay;
618 } else
619 status->delay = 0;
620 } else {
621 status->avail = snd_pcm_capture_avail(runtime);
622 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
623 status->delay = status->avail + runtime->delay;
624 else
625 status->delay = 0;
626 }
627 status->avail_max = runtime->avail_max;
628 status->overrange = runtime->overrange;
629 runtime->avail_max = 0;
630 runtime->overrange = 0;
631 _end:
632 snd_pcm_stream_unlock_irq(substream);
633 return 0;
634 }
635
636 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
637 struct snd_pcm_status __user * _status)
638 {
639 struct snd_pcm_status status;
640 int res;
641
642 memset(&status, 0, sizeof(status));
643 res = snd_pcm_status(substream, &status);
644 if (res < 0)
645 return res;
646 if (copy_to_user(_status, &status, sizeof(status)))
647 return -EFAULT;
648 return 0;
649 }
650
651 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
652 struct snd_pcm_channel_info * info)
653 {
654 struct snd_pcm_runtime *runtime;
655 unsigned int channel;
656
657 channel = info->channel;
658 runtime = substream->runtime;
659 snd_pcm_stream_lock_irq(substream);
660 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
661 snd_pcm_stream_unlock_irq(substream);
662 return -EBADFD;
663 }
664 snd_pcm_stream_unlock_irq(substream);
665 if (channel >= runtime->channels)
666 return -EINVAL;
667 memset(info, 0, sizeof(*info));
668 info->channel = channel;
669 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
670 }
671
672 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
673 struct snd_pcm_channel_info __user * _info)
674 {
675 struct snd_pcm_channel_info info;
676 int res;
677
678 if (copy_from_user(&info, _info, sizeof(info)))
679 return -EFAULT;
680 res = snd_pcm_channel_info(substream, &info);
681 if (res < 0)
682 return res;
683 if (copy_to_user(_info, &info, sizeof(info)))
684 return -EFAULT;
685 return 0;
686 }
687
688 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
689 {
690 struct snd_pcm_runtime *runtime = substream->runtime;
691 if (runtime->trigger_master == NULL)
692 return;
693 if (runtime->trigger_master == substream) {
694 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
695 } else {
696 snd_pcm_trigger_tstamp(runtime->trigger_master);
697 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
698 }
699 runtime->trigger_master = NULL;
700 }
701
702 struct action_ops {
703 int (*pre_action)(struct snd_pcm_substream *substream, int state);
704 int (*do_action)(struct snd_pcm_substream *substream, int state);
705 void (*undo_action)(struct snd_pcm_substream *substream, int state);
706 void (*post_action)(struct snd_pcm_substream *substream, int state);
707 };
708
709 /*
710 * this functions is core for handling of linked stream
711 * Note: the stream state might be changed also on failure
712 * Note2: call with calling stream lock + link lock
713 */
714 static int snd_pcm_action_group(struct action_ops *ops,
715 struct snd_pcm_substream *substream,
716 int state, int do_lock)
717 {
718 struct snd_pcm_substream *s = NULL;
719 struct snd_pcm_substream *s1;
720 int res = 0;
721
722 snd_pcm_group_for_each_entry(s, substream) {
723 if (do_lock && s != substream)
724 spin_lock_nested(&s->self_group.lock,
725 SINGLE_DEPTH_NESTING);
726 res = ops->pre_action(s, state);
727 if (res < 0)
728 goto _unlock;
729 }
730 snd_pcm_group_for_each_entry(s, substream) {
731 res = ops->do_action(s, state);
732 if (res < 0) {
733 if (ops->undo_action) {
734 snd_pcm_group_for_each_entry(s1, substream) {
735 if (s1 == s) /* failed stream */
736 break;
737 ops->undo_action(s1, state);
738 }
739 }
740 s = NULL; /* unlock all */
741 goto _unlock;
742 }
743 }
744 snd_pcm_group_for_each_entry(s, substream) {
745 ops->post_action(s, state);
746 }
747 _unlock:
748 if (do_lock) {
749 /* unlock streams */
750 snd_pcm_group_for_each_entry(s1, substream) {
751 if (s1 != substream)
752 spin_unlock(&s1->self_group.lock);
753 if (s1 == s) /* end */
754 break;
755 }
756 }
757 return res;
758 }
759
760 /*
761 * Note: call with stream lock
762 */
763 static int snd_pcm_action_single(struct action_ops *ops,
764 struct snd_pcm_substream *substream,
765 int state)
766 {
767 int res;
768
769 res = ops->pre_action(substream, state);
770 if (res < 0)
771 return res;
772 res = ops->do_action(substream, state);
773 if (res == 0)
774 ops->post_action(substream, state);
775 else if (ops->undo_action)
776 ops->undo_action(substream, state);
777 return res;
778 }
779
780 /*
781 * Note: call with stream lock
782 */
783 static int snd_pcm_action(struct action_ops *ops,
784 struct snd_pcm_substream *substream,
785 int state)
786 {
787 int res;
788
789 if (snd_pcm_stream_linked(substream)) {
790 if (!spin_trylock(&substream->group->lock)) {
791 spin_unlock(&substream->self_group.lock);
792 spin_lock(&substream->group->lock);
793 spin_lock(&substream->self_group.lock);
794 }
795 res = snd_pcm_action_group(ops, substream, state, 1);
796 spin_unlock(&substream->group->lock);
797 } else {
798 res = snd_pcm_action_single(ops, substream, state);
799 }
800 return res;
801 }
802
803 /*
804 * Note: don't use any locks before
805 */
806 static int snd_pcm_action_lock_irq(struct action_ops *ops,
807 struct snd_pcm_substream *substream,
808 int state)
809 {
810 int res;
811
812 read_lock_irq(&snd_pcm_link_rwlock);
813 if (snd_pcm_stream_linked(substream)) {
814 spin_lock(&substream->group->lock);
815 spin_lock(&substream->self_group.lock);
816 res = snd_pcm_action_group(ops, substream, state, 1);
817 spin_unlock(&substream->self_group.lock);
818 spin_unlock(&substream->group->lock);
819 } else {
820 spin_lock(&substream->self_group.lock);
821 res = snd_pcm_action_single(ops, substream, state);
822 spin_unlock(&substream->self_group.lock);
823 }
824 read_unlock_irq(&snd_pcm_link_rwlock);
825 return res;
826 }
827
828 /*
829 */
830 static int snd_pcm_action_nonatomic(struct action_ops *ops,
831 struct snd_pcm_substream *substream,
832 int state)
833 {
834 int res;
835
836 down_read(&snd_pcm_link_rwsem);
837 if (snd_pcm_stream_linked(substream))
838 res = snd_pcm_action_group(ops, substream, state, 0);
839 else
840 res = snd_pcm_action_single(ops, substream, state);
841 up_read(&snd_pcm_link_rwsem);
842 return res;
843 }
844
845 /*
846 * start callbacks
847 */
848 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
849 {
850 struct snd_pcm_runtime *runtime = substream->runtime;
851 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
852 return -EBADFD;
853 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
854 !snd_pcm_playback_data(substream))
855 return -EPIPE;
856 runtime->trigger_master = substream;
857 return 0;
858 }
859
860 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
861 {
862 if (substream->runtime->trigger_master != substream)
863 return 0;
864 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
865 }
866
867 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
868 {
869 if (substream->runtime->trigger_master == substream)
870 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
871 }
872
873 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
874 {
875 struct snd_pcm_runtime *runtime = substream->runtime;
876 snd_pcm_trigger_tstamp(substream);
877 runtime->hw_ptr_jiffies = jiffies;
878 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
879 runtime->rate;
880 runtime->status->state = state;
881 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
882 runtime->silence_size > 0)
883 snd_pcm_playback_silence(substream, ULONG_MAX);
884 if (substream->timer)
885 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
886 &runtime->trigger_tstamp);
887 }
888
889 static struct action_ops snd_pcm_action_start = {
890 .pre_action = snd_pcm_pre_start,
891 .do_action = snd_pcm_do_start,
892 .undo_action = snd_pcm_undo_start,
893 .post_action = snd_pcm_post_start
894 };
895
896 /**
897 * snd_pcm_start - start all linked streams
898 * @substream: the PCM substream instance
899 */
900 int snd_pcm_start(struct snd_pcm_substream *substream)
901 {
902 return snd_pcm_action(&snd_pcm_action_start, substream,
903 SNDRV_PCM_STATE_RUNNING);
904 }
905
906 /*
907 * stop callbacks
908 */
909 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
910 {
911 struct snd_pcm_runtime *runtime = substream->runtime;
912 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
913 return -EBADFD;
914 runtime->trigger_master = substream;
915 return 0;
916 }
917
918 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
919 {
920 if (substream->runtime->trigger_master == substream &&
921 snd_pcm_running(substream))
922 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
923 return 0; /* unconditonally stop all substreams */
924 }
925
926 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
927 {
928 struct snd_pcm_runtime *runtime = substream->runtime;
929 if (runtime->status->state != state) {
930 snd_pcm_trigger_tstamp(substream);
931 if (substream->timer)
932 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
933 &runtime->trigger_tstamp);
934 runtime->status->state = state;
935 }
936 wake_up(&runtime->sleep);
937 wake_up(&runtime->tsleep);
938 }
939
940 static struct action_ops snd_pcm_action_stop = {
941 .pre_action = snd_pcm_pre_stop,
942 .do_action = snd_pcm_do_stop,
943 .post_action = snd_pcm_post_stop
944 };
945
946 /**
947 * snd_pcm_stop - try to stop all running streams in the substream group
948 * @substream: the PCM substream instance
949 * @state: PCM state after stopping the stream
950 *
951 * The state of each stream is then changed to the given state unconditionally.
952 */
953 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
954 {
955 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
956 }
957
958 EXPORT_SYMBOL(snd_pcm_stop);
959
960 /**
961 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
962 * @substream: the PCM substream
963 *
964 * After stopping, the state is changed to SETUP.
965 * Unlike snd_pcm_stop(), this affects only the given stream.
966 */
967 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
968 {
969 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
970 SNDRV_PCM_STATE_SETUP);
971 }
972
973 /*
974 * pause callbacks
975 */
976 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
977 {
978 struct snd_pcm_runtime *runtime = substream->runtime;
979 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
980 return -ENOSYS;
981 if (push) {
982 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
983 return -EBADFD;
984 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
985 return -EBADFD;
986 runtime->trigger_master = substream;
987 return 0;
988 }
989
990 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
991 {
992 if (substream->runtime->trigger_master != substream)
993 return 0;
994 /* some drivers might use hw_ptr to recover from the pause -
995 update the hw_ptr now */
996 if (push)
997 snd_pcm_update_hw_ptr(substream);
998 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
999 * a delta between the current jiffies, this gives a large enough
1000 * delta, effectively to skip the check once.
1001 */
1002 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1003 return substream->ops->trigger(substream,
1004 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1005 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1006 }
1007
1008 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1009 {
1010 if (substream->runtime->trigger_master == substream)
1011 substream->ops->trigger(substream,
1012 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1013 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1014 }
1015
1016 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1017 {
1018 struct snd_pcm_runtime *runtime = substream->runtime;
1019 snd_pcm_trigger_tstamp(substream);
1020 if (push) {
1021 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1022 if (substream->timer)
1023 snd_timer_notify(substream->timer,
1024 SNDRV_TIMER_EVENT_MPAUSE,
1025 &runtime->trigger_tstamp);
1026 wake_up(&runtime->sleep);
1027 wake_up(&runtime->tsleep);
1028 } else {
1029 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1030 if (substream->timer)
1031 snd_timer_notify(substream->timer,
1032 SNDRV_TIMER_EVENT_MCONTINUE,
1033 &runtime->trigger_tstamp);
1034 }
1035 }
1036
1037 static struct action_ops snd_pcm_action_pause = {
1038 .pre_action = snd_pcm_pre_pause,
1039 .do_action = snd_pcm_do_pause,
1040 .undo_action = snd_pcm_undo_pause,
1041 .post_action = snd_pcm_post_pause
1042 };
1043
1044 /*
1045 * Push/release the pause for all linked streams.
1046 */
1047 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1048 {
1049 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1050 }
1051
1052 #ifdef CONFIG_PM
1053 /* suspend */
1054
1055 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1056 {
1057 struct snd_pcm_runtime *runtime = substream->runtime;
1058 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1059 return -EBUSY;
1060 runtime->trigger_master = substream;
1061 return 0;
1062 }
1063
1064 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1065 {
1066 struct snd_pcm_runtime *runtime = substream->runtime;
1067 if (runtime->trigger_master != substream)
1068 return 0;
1069 if (! snd_pcm_running(substream))
1070 return 0;
1071 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1072 return 0; /* suspend unconditionally */
1073 }
1074
1075 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1076 {
1077 struct snd_pcm_runtime *runtime = substream->runtime;
1078 snd_pcm_trigger_tstamp(substream);
1079 if (substream->timer)
1080 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1081 &runtime->trigger_tstamp);
1082 runtime->status->suspended_state = runtime->status->state;
1083 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1084 wake_up(&runtime->sleep);
1085 wake_up(&runtime->tsleep);
1086 }
1087
1088 static struct action_ops snd_pcm_action_suspend = {
1089 .pre_action = snd_pcm_pre_suspend,
1090 .do_action = snd_pcm_do_suspend,
1091 .post_action = snd_pcm_post_suspend
1092 };
1093
1094 /**
1095 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1096 * @substream: the PCM substream
1097 *
1098 * After this call, all streams are changed to SUSPENDED state.
1099 */
1100 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1101 {
1102 int err;
1103 unsigned long flags;
1104
1105 if (! substream)
1106 return 0;
1107
1108 snd_pcm_stream_lock_irqsave(substream, flags);
1109 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1110 snd_pcm_stream_unlock_irqrestore(substream, flags);
1111 return err;
1112 }
1113
1114 EXPORT_SYMBOL(snd_pcm_suspend);
1115
1116 /**
1117 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1118 * @pcm: the PCM instance
1119 *
1120 * After this call, all streams are changed to SUSPENDED state.
1121 */
1122 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1123 {
1124 struct snd_pcm_substream *substream;
1125 int stream, err = 0;
1126
1127 if (! pcm)
1128 return 0;
1129
1130 for (stream = 0; stream < 2; stream++) {
1131 for (substream = pcm->streams[stream].substream;
1132 substream; substream = substream->next) {
1133 /* FIXME: the open/close code should lock this as well */
1134 if (substream->runtime == NULL)
1135 continue;
1136 err = snd_pcm_suspend(substream);
1137 if (err < 0 && err != -EBUSY)
1138 return err;
1139 }
1140 }
1141 return 0;
1142 }
1143
1144 EXPORT_SYMBOL(snd_pcm_suspend_all);
1145
1146 /* resume */
1147
1148 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1149 {
1150 struct snd_pcm_runtime *runtime = substream->runtime;
1151 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1152 return -ENOSYS;
1153 runtime->trigger_master = substream;
1154 return 0;
1155 }
1156
1157 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1158 {
1159 struct snd_pcm_runtime *runtime = substream->runtime;
1160 if (runtime->trigger_master != substream)
1161 return 0;
1162 /* DMA not running previously? */
1163 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1164 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1165 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1166 return 0;
1167 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1168 }
1169
1170 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1171 {
1172 if (substream->runtime->trigger_master == substream &&
1173 snd_pcm_running(substream))
1174 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1175 }
1176
1177 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1178 {
1179 struct snd_pcm_runtime *runtime = substream->runtime;
1180 snd_pcm_trigger_tstamp(substream);
1181 if (substream->timer)
1182 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1183 &runtime->trigger_tstamp);
1184 runtime->status->state = runtime->status->suspended_state;
1185 }
1186
1187 static struct action_ops snd_pcm_action_resume = {
1188 .pre_action = snd_pcm_pre_resume,
1189 .do_action = snd_pcm_do_resume,
1190 .undo_action = snd_pcm_undo_resume,
1191 .post_action = snd_pcm_post_resume
1192 };
1193
1194 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1195 {
1196 struct snd_card *card = substream->pcm->card;
1197 int res;
1198
1199 snd_power_lock(card);
1200 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1201 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1202 snd_power_unlock(card);
1203 return res;
1204 }
1205
1206 #else
1207
1208 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1209 {
1210 return -ENOSYS;
1211 }
1212
1213 #endif /* CONFIG_PM */
1214
1215 /*
1216 * xrun ioctl
1217 *
1218 * Change the RUNNING stream(s) to XRUN state.
1219 */
1220 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1221 {
1222 struct snd_card *card = substream->pcm->card;
1223 struct snd_pcm_runtime *runtime = substream->runtime;
1224 int result;
1225
1226 snd_power_lock(card);
1227 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1228 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1229 if (result < 0)
1230 goto _unlock;
1231 }
1232
1233 snd_pcm_stream_lock_irq(substream);
1234 switch (runtime->status->state) {
1235 case SNDRV_PCM_STATE_XRUN:
1236 result = 0; /* already there */
1237 break;
1238 case SNDRV_PCM_STATE_RUNNING:
1239 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1240 break;
1241 default:
1242 result = -EBADFD;
1243 }
1244 snd_pcm_stream_unlock_irq(substream);
1245 _unlock:
1246 snd_power_unlock(card);
1247 return result;
1248 }
1249
1250 /*
1251 * reset ioctl
1252 */
1253 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1254 {
1255 struct snd_pcm_runtime *runtime = substream->runtime;
1256 switch (runtime->status->state) {
1257 case SNDRV_PCM_STATE_RUNNING:
1258 case SNDRV_PCM_STATE_PREPARED:
1259 case SNDRV_PCM_STATE_PAUSED:
1260 case SNDRV_PCM_STATE_SUSPENDED:
1261 return 0;
1262 default:
1263 return -EBADFD;
1264 }
1265 }
1266
1267 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1268 {
1269 struct snd_pcm_runtime *runtime = substream->runtime;
1270 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1271 if (err < 0)
1272 return err;
1273 runtime->hw_ptr_base = 0;
1274 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1275 runtime->status->hw_ptr % runtime->period_size;
1276 runtime->silence_start = runtime->status->hw_ptr;
1277 runtime->silence_filled = 0;
1278 return 0;
1279 }
1280
1281 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1282 {
1283 struct snd_pcm_runtime *runtime = substream->runtime;
1284 runtime->control->appl_ptr = runtime->status->hw_ptr;
1285 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1286 runtime->silence_size > 0)
1287 snd_pcm_playback_silence(substream, ULONG_MAX);
1288 }
1289
1290 static struct action_ops snd_pcm_action_reset = {
1291 .pre_action = snd_pcm_pre_reset,
1292 .do_action = snd_pcm_do_reset,
1293 .post_action = snd_pcm_post_reset
1294 };
1295
1296 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1297 {
1298 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1299 }
1300
1301 /*
1302 * prepare ioctl
1303 */
1304 /* we use the second argument for updating f_flags */
1305 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1306 int f_flags)
1307 {
1308 struct snd_pcm_runtime *runtime = substream->runtime;
1309 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1310 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1311 return -EBADFD;
1312 if (snd_pcm_running(substream))
1313 return -EBUSY;
1314 substream->f_flags = f_flags;
1315 return 0;
1316 }
1317
1318 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1319 {
1320 int err;
1321 err = substream->ops->prepare(substream);
1322 if (err < 0)
1323 return err;
1324 return snd_pcm_do_reset(substream, 0);
1325 }
1326
1327 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1328 {
1329 struct snd_pcm_runtime *runtime = substream->runtime;
1330 runtime->control->appl_ptr = runtime->status->hw_ptr;
1331 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1332 }
1333
1334 static struct action_ops snd_pcm_action_prepare = {
1335 .pre_action = snd_pcm_pre_prepare,
1336 .do_action = snd_pcm_do_prepare,
1337 .post_action = snd_pcm_post_prepare
1338 };
1339
1340 /**
1341 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1342 * @substream: the PCM substream instance
1343 * @file: file to refer f_flags
1344 */
1345 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1346 struct file *file)
1347 {
1348 int res;
1349 struct snd_card *card = substream->pcm->card;
1350 int f_flags;
1351
1352 if (file)
1353 f_flags = file->f_flags;
1354 else
1355 f_flags = substream->f_flags;
1356
1357 snd_power_lock(card);
1358 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1359 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1360 substream, f_flags);
1361 snd_power_unlock(card);
1362 return res;
1363 }
1364
1365 /*
1366 * drain ioctl
1367 */
1368
1369 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1370 {
1371 struct snd_pcm_runtime *runtime = substream->runtime;
1372 switch (runtime->status->state) {
1373 case SNDRV_PCM_STATE_OPEN:
1374 case SNDRV_PCM_STATE_DISCONNECTED:
1375 case SNDRV_PCM_STATE_SUSPENDED:
1376 return -EBADFD;
1377 }
1378 runtime->trigger_master = substream;
1379 return 0;
1380 }
1381
1382 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1383 {
1384 struct snd_pcm_runtime *runtime = substream->runtime;
1385 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1386 switch (runtime->status->state) {
1387 case SNDRV_PCM_STATE_PREPARED:
1388 /* start playback stream if possible */
1389 if (! snd_pcm_playback_empty(substream)) {
1390 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1391 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1392 }
1393 break;
1394 case SNDRV_PCM_STATE_RUNNING:
1395 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1396 break;
1397 case SNDRV_PCM_STATE_XRUN:
1398 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1399 break;
1400 default:
1401 break;
1402 }
1403 } else {
1404 /* stop running stream */
1405 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1406 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1407 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1408 snd_pcm_do_stop(substream, new_state);
1409 snd_pcm_post_stop(substream, new_state);
1410 }
1411 }
1412 return 0;
1413 }
1414
1415 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1416 {
1417 }
1418
1419 static struct action_ops snd_pcm_action_drain_init = {
1420 .pre_action = snd_pcm_pre_drain_init,
1421 .do_action = snd_pcm_do_drain_init,
1422 .post_action = snd_pcm_post_drain_init
1423 };
1424
1425 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1426
1427 /*
1428 * Drain the stream(s).
1429 * When the substream is linked, sync until the draining of all playback streams
1430 * is finished.
1431 * After this call, all streams are supposed to be either SETUP or DRAINING
1432 * (capture only) state.
1433 */
1434 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1435 struct file *file)
1436 {
1437 struct snd_card *card;
1438 struct snd_pcm_runtime *runtime;
1439 struct snd_pcm_substream *s;
1440 wait_queue_t wait;
1441 int result = 0;
1442 int nonblock = 0;
1443
1444 card = substream->pcm->card;
1445 runtime = substream->runtime;
1446
1447 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1448 return -EBADFD;
1449
1450 snd_power_lock(card);
1451 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1452 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1453 if (result < 0) {
1454 snd_power_unlock(card);
1455 return result;
1456 }
1457 }
1458
1459 if (file) {
1460 if (file->f_flags & O_NONBLOCK)
1461 nonblock = 1;
1462 } else if (substream->f_flags & O_NONBLOCK)
1463 nonblock = 1;
1464
1465 down_read(&snd_pcm_link_rwsem);
1466 snd_pcm_stream_lock_irq(substream);
1467 /* resume pause */
1468 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1469 snd_pcm_pause(substream, 0);
1470
1471 /* pre-start/stop - all running streams are changed to DRAINING state */
1472 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1473 if (result < 0)
1474 goto unlock;
1475 /* in non-blocking, we don't wait in ioctl but let caller poll */
1476 if (nonblock) {
1477 result = -EAGAIN;
1478 goto unlock;
1479 }
1480
1481 for (;;) {
1482 long tout;
1483 struct snd_pcm_runtime *to_check;
1484 if (signal_pending(current)) {
1485 result = -ERESTARTSYS;
1486 break;
1487 }
1488 /* find a substream to drain */
1489 to_check = NULL;
1490 snd_pcm_group_for_each_entry(s, substream) {
1491 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1492 continue;
1493 runtime = s->runtime;
1494 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1495 to_check = runtime;
1496 break;
1497 }
1498 }
1499 if (!to_check)
1500 break; /* all drained */
1501 init_waitqueue_entry(&wait, current);
1502 add_wait_queue(&to_check->sleep, &wait);
1503 snd_pcm_stream_unlock_irq(substream);
1504 up_read(&snd_pcm_link_rwsem);
1505 snd_power_unlock(card);
1506 if (runtime->no_period_wakeup)
1507 tout = MAX_SCHEDULE_TIMEOUT;
1508 else {
1509 tout = 10;
1510 if (runtime->rate) {
1511 long t = runtime->period_size * 2 / runtime->rate;
1512 tout = max(t, tout);
1513 }
1514 tout = msecs_to_jiffies(tout * 1000);
1515 }
1516 tout = schedule_timeout_interruptible(tout);
1517 snd_power_lock(card);
1518 down_read(&snd_pcm_link_rwsem);
1519 snd_pcm_stream_lock_irq(substream);
1520 remove_wait_queue(&to_check->sleep, &wait);
1521 if (tout == 0) {
1522 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1523 result = -ESTRPIPE;
1524 else {
1525 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1526 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1527 result = -EIO;
1528 }
1529 break;
1530 }
1531 }
1532
1533 unlock:
1534 snd_pcm_stream_unlock_irq(substream);
1535 up_read(&snd_pcm_link_rwsem);
1536 snd_power_unlock(card);
1537
1538 return result;
1539 }
1540
1541 /*
1542 * drop ioctl
1543 *
1544 * Immediately put all linked substreams into SETUP state.
1545 */
1546 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1547 {
1548 struct snd_pcm_runtime *runtime;
1549 int result = 0;
1550
1551 if (PCM_RUNTIME_CHECK(substream))
1552 return -ENXIO;
1553 runtime = substream->runtime;
1554
1555 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1556 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1557 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1558 return -EBADFD;
1559
1560 snd_pcm_stream_lock_irq(substream);
1561 /* resume pause */
1562 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1563 snd_pcm_pause(substream, 0);
1564
1565 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1566 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1567 snd_pcm_stream_unlock_irq(substream);
1568
1569 return result;
1570 }
1571
1572
1573 /* WARNING: Don't forget to fput back the file */
1574 static struct file *snd_pcm_file_fd(int fd, int *fput_needed)
1575 {
1576 struct file *file;
1577 struct inode *inode;
1578 unsigned int minor;
1579
1580 file = fget_light(fd, fput_needed);
1581 if (!file)
1582 return NULL;
1583 inode = file->f_path.dentry->d_inode;
1584 if (!S_ISCHR(inode->i_mode) ||
1585 imajor(inode) != snd_major) {
1586 fput_light(file, *fput_needed);
1587 return NULL;
1588 }
1589 minor = iminor(inode);
1590 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1591 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1592 fput_light(file, *fput_needed);
1593 return NULL;
1594 }
1595 return file;
1596 }
1597
1598 /*
1599 * PCM link handling
1600 */
1601 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1602 {
1603 int res = 0;
1604 struct file *file;
1605 struct snd_pcm_file *pcm_file;
1606 struct snd_pcm_substream *substream1;
1607 struct snd_pcm_group *group;
1608 int fput_needed;
1609
1610 file = snd_pcm_file_fd(fd, &fput_needed);
1611 if (!file)
1612 return -EBADFD;
1613 pcm_file = file->private_data;
1614 substream1 = pcm_file->substream;
1615 group = kmalloc(sizeof(*group), GFP_KERNEL);
1616 if (!group) {
1617 res = -ENOMEM;
1618 goto _nolock;
1619 }
1620 down_write(&snd_pcm_link_rwsem);
1621 write_lock_irq(&snd_pcm_link_rwlock);
1622 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1623 substream->runtime->status->state != substream1->runtime->status->state) {
1624 res = -EBADFD;
1625 goto _end;
1626 }
1627 if (snd_pcm_stream_linked(substream1)) {
1628 res = -EALREADY;
1629 goto _end;
1630 }
1631 if (!snd_pcm_stream_linked(substream)) {
1632 substream->group = group;
1633 spin_lock_init(&substream->group->lock);
1634 INIT_LIST_HEAD(&substream->group->substreams);
1635 list_add_tail(&substream->link_list, &substream->group->substreams);
1636 substream->group->count = 1;
1637 }
1638 list_add_tail(&substream1->link_list, &substream->group->substreams);
1639 substream->group->count++;
1640 substream1->group = substream->group;
1641 _end:
1642 write_unlock_irq(&snd_pcm_link_rwlock);
1643 up_write(&snd_pcm_link_rwsem);
1644 _nolock:
1645 fput_light(file, fput_needed);
1646 if (res < 0)
1647 kfree(group);
1648 return res;
1649 }
1650
1651 static void relink_to_local(struct snd_pcm_substream *substream)
1652 {
1653 substream->group = &substream->self_group;
1654 INIT_LIST_HEAD(&substream->self_group.substreams);
1655 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1656 }
1657
1658 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1659 {
1660 struct snd_pcm_substream *s;
1661 int res = 0;
1662
1663 down_write(&snd_pcm_link_rwsem);
1664 write_lock_irq(&snd_pcm_link_rwlock);
1665 if (!snd_pcm_stream_linked(substream)) {
1666 res = -EALREADY;
1667 goto _end;
1668 }
1669 list_del(&substream->link_list);
1670 substream->group->count--;
1671 if (substream->group->count == 1) { /* detach the last stream, too */
1672 snd_pcm_group_for_each_entry(s, substream) {
1673 relink_to_local(s);
1674 break;
1675 }
1676 kfree(substream->group);
1677 }
1678 relink_to_local(substream);
1679 _end:
1680 write_unlock_irq(&snd_pcm_link_rwlock);
1681 up_write(&snd_pcm_link_rwsem);
1682 return res;
1683 }
1684
1685 /*
1686 * hw configurator
1687 */
1688 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1689 struct snd_pcm_hw_rule *rule)
1690 {
1691 struct snd_interval t;
1692 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1693 hw_param_interval_c(params, rule->deps[1]), &t);
1694 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1695 }
1696
1697 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1698 struct snd_pcm_hw_rule *rule)
1699 {
1700 struct snd_interval t;
1701 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1702 hw_param_interval_c(params, rule->deps[1]), &t);
1703 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1704 }
1705
1706 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1707 struct snd_pcm_hw_rule *rule)
1708 {
1709 struct snd_interval t;
1710 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1711 hw_param_interval_c(params, rule->deps[1]),
1712 (unsigned long) rule->private, &t);
1713 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1714 }
1715
1716 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1717 struct snd_pcm_hw_rule *rule)
1718 {
1719 struct snd_interval t;
1720 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1721 (unsigned long) rule->private,
1722 hw_param_interval_c(params, rule->deps[1]), &t);
1723 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1724 }
1725
1726 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1727 struct snd_pcm_hw_rule *rule)
1728 {
1729 unsigned int k;
1730 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1731 struct snd_mask m;
1732 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1733 snd_mask_any(&m);
1734 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1735 int bits;
1736 if (! snd_mask_test(mask, k))
1737 continue;
1738 bits = snd_pcm_format_physical_width(k);
1739 if (bits <= 0)
1740 continue; /* ignore invalid formats */
1741 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1742 snd_mask_reset(&m, k);
1743 }
1744 return snd_mask_refine(mask, &m);
1745 }
1746
1747 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1748 struct snd_pcm_hw_rule *rule)
1749 {
1750 struct snd_interval t;
1751 unsigned int k;
1752 t.min = UINT_MAX;
1753 t.max = 0;
1754 t.openmin = 0;
1755 t.openmax = 0;
1756 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1757 int bits;
1758 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1759 continue;
1760 bits = snd_pcm_format_physical_width(k);
1761 if (bits <= 0)
1762 continue; /* ignore invalid formats */
1763 if (t.min > (unsigned)bits)
1764 t.min = bits;
1765 if (t.max < (unsigned)bits)
1766 t.max = bits;
1767 }
1768 t.integer = 1;
1769 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1770 }
1771
1772 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1773 #error "Change this table"
1774 #endif
1775
1776 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1777 48000, 64000, 88200, 96000, 176400, 192000 };
1778
1779 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1780 .count = ARRAY_SIZE(rates),
1781 .list = rates,
1782 };
1783
1784 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1785 struct snd_pcm_hw_rule *rule)
1786 {
1787 struct snd_pcm_hardware *hw = rule->private;
1788 return snd_interval_list(hw_param_interval(params, rule->var),
1789 snd_pcm_known_rates.count,
1790 snd_pcm_known_rates.list, hw->rates);
1791 }
1792
1793 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1794 struct snd_pcm_hw_rule *rule)
1795 {
1796 struct snd_interval t;
1797 struct snd_pcm_substream *substream = rule->private;
1798 t.min = 0;
1799 t.max = substream->buffer_bytes_max;
1800 t.openmin = 0;
1801 t.openmax = 0;
1802 t.integer = 1;
1803 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1804 }
1805
1806 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1807 {
1808 struct snd_pcm_runtime *runtime = substream->runtime;
1809 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1810 int k, err;
1811
1812 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1813 snd_mask_any(constrs_mask(constrs, k));
1814 }
1815
1816 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1817 snd_interval_any(constrs_interval(constrs, k));
1818 }
1819
1820 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1821 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1822 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1823 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1824 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1825
1826 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1827 snd_pcm_hw_rule_format, NULL,
1828 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1829 if (err < 0)
1830 return err;
1831 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1832 snd_pcm_hw_rule_sample_bits, NULL,
1833 SNDRV_PCM_HW_PARAM_FORMAT,
1834 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1835 if (err < 0)
1836 return err;
1837 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1838 snd_pcm_hw_rule_div, NULL,
1839 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1840 if (err < 0)
1841 return err;
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1843 snd_pcm_hw_rule_mul, NULL,
1844 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1845 if (err < 0)
1846 return err;
1847 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1848 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1849 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1850 if (err < 0)
1851 return err;
1852 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1853 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1854 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1855 if (err < 0)
1856 return err;
1857 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1858 snd_pcm_hw_rule_div, NULL,
1859 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1860 if (err < 0)
1861 return err;
1862 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1863 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1864 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1865 if (err < 0)
1866 return err;
1867 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1868 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1869 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1870 if (err < 0)
1871 return err;
1872 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1873 snd_pcm_hw_rule_div, NULL,
1874 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1875 if (err < 0)
1876 return err;
1877 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1878 snd_pcm_hw_rule_div, NULL,
1879 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1880 if (err < 0)
1881 return err;
1882 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1883 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1884 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1885 if (err < 0)
1886 return err;
1887 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1888 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1889 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1890 if (err < 0)
1891 return err;
1892 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1893 snd_pcm_hw_rule_mul, NULL,
1894 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1895 if (err < 0)
1896 return err;
1897 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1898 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1899 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -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_muldivk, (void*) 1000000,
1904 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1905 if (err < 0)
1906 return err;
1907 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1908 snd_pcm_hw_rule_muldivk, (void*) 8,
1909 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 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_BYTES,
1913 snd_pcm_hw_rule_muldivk, (void*) 8,
1914 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1915 if (err < 0)
1916 return err;
1917 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1918 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1919 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1920 if (err < 0)
1921 return err;
1922 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1923 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1924 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1925 if (err < 0)
1926 return err;
1927 return 0;
1928 }
1929
1930 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1931 {
1932 struct snd_pcm_runtime *runtime = substream->runtime;
1933 struct snd_pcm_hardware *hw = &runtime->hw;
1934 int err;
1935 unsigned int mask = 0;
1936
1937 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1938 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1939 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1940 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1941 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1942 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1943 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1944 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1945 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1946 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1947 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1948 }
1949 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1950 if (err < 0)
1951 return err;
1952
1953 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1954 if (err < 0)
1955 return err;
1956
1957 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1958 if (err < 0)
1959 return err;
1960
1961 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1962 hw->channels_min, hw->channels_max);
1963 if (err < 0)
1964 return err;
1965
1966 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1967 hw->rate_min, hw->rate_max);
1968 if (err < 0)
1969 return err;
1970
1971 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1972 hw->period_bytes_min, hw->period_bytes_max);
1973 if (err < 0)
1974 return err;
1975
1976 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1977 hw->periods_min, hw->periods_max);
1978 if (err < 0)
1979 return err;
1980
1981 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1982 hw->period_bytes_min, hw->buffer_bytes_max);
1983 if (err < 0)
1984 return err;
1985
1986 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1987 snd_pcm_hw_rule_buffer_bytes_max, substream,
1988 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1989 if (err < 0)
1990 return err;
1991
1992 /* FIXME: remove */
1993 if (runtime->dma_bytes) {
1994 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1995 if (err < 0)
1996 return -EINVAL;
1997 }
1998
1999 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2000 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2001 snd_pcm_hw_rule_rate, hw,
2002 SNDRV_PCM_HW_PARAM_RATE, -1);
2003 if (err < 0)
2004 return err;
2005 }
2006
2007 /* FIXME: this belong to lowlevel */
2008 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2009
2010 return 0;
2011 }
2012
2013 static void pcm_release_private(struct snd_pcm_substream *substream)
2014 {
2015 snd_pcm_unlink(substream);
2016 }
2017
2018 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2019 {
2020 substream->ref_count--;
2021 if (substream->ref_count > 0)
2022 return;
2023
2024 snd_pcm_drop(substream);
2025 if (substream->hw_opened) {
2026 if (substream->ops->hw_free != NULL)
2027 substream->ops->hw_free(substream);
2028 substream->ops->close(substream);
2029 substream->hw_opened = 0;
2030 }
2031 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2032 pm_qos_remove_request(&substream->latency_pm_qos_req);
2033 if (substream->pcm_release) {
2034 substream->pcm_release(substream);
2035 substream->pcm_release = NULL;
2036 }
2037 snd_pcm_detach_substream(substream);
2038 }
2039
2040 EXPORT_SYMBOL(snd_pcm_release_substream);
2041
2042 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2043 struct file *file,
2044 struct snd_pcm_substream **rsubstream)
2045 {
2046 struct snd_pcm_substream *substream;
2047 int err;
2048
2049 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2050 if (err < 0)
2051 return err;
2052 if (substream->ref_count > 1) {
2053 *rsubstream = substream;
2054 return 0;
2055 }
2056
2057 err = snd_pcm_hw_constraints_init(substream);
2058 if (err < 0) {
2059 snd_printd("snd_pcm_hw_constraints_init failed\n");
2060 goto error;
2061 }
2062
2063 if ((err = substream->ops->open(substream)) < 0)
2064 goto error;
2065
2066 substream->hw_opened = 1;
2067
2068 err = snd_pcm_hw_constraints_complete(substream);
2069 if (err < 0) {
2070 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2071 goto error;
2072 }
2073
2074 *rsubstream = substream;
2075 return 0;
2076
2077 error:
2078 snd_pcm_release_substream(substream);
2079 return err;
2080 }
2081
2082 EXPORT_SYMBOL(snd_pcm_open_substream);
2083
2084 static int snd_pcm_open_file(struct file *file,
2085 struct snd_pcm *pcm,
2086 int stream)
2087 {
2088 struct snd_pcm_file *pcm_file;
2089 struct snd_pcm_substream *substream;
2090 int err;
2091
2092 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2093 if (err < 0)
2094 return err;
2095
2096 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2097 if (pcm_file == NULL) {
2098 snd_pcm_release_substream(substream);
2099 return -ENOMEM;
2100 }
2101 pcm_file->substream = substream;
2102 if (substream->ref_count == 1) {
2103 substream->file = pcm_file;
2104 substream->pcm_release = pcm_release_private;
2105 }
2106 file->private_data = pcm_file;
2107
2108 return 0;
2109 }
2110
2111 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2112 {
2113 struct snd_pcm *pcm;
2114 int err = nonseekable_open(inode, file);
2115 if (err < 0)
2116 return err;
2117 pcm = snd_lookup_minor_data(iminor(inode),
2118 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2119 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2120 }
2121
2122 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2123 {
2124 struct snd_pcm *pcm;
2125 int err = nonseekable_open(inode, file);
2126 if (err < 0)
2127 return err;
2128 pcm = snd_lookup_minor_data(iminor(inode),
2129 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2130 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2131 }
2132
2133 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2134 {
2135 int err;
2136 wait_queue_t wait;
2137
2138 if (pcm == NULL) {
2139 err = -ENODEV;
2140 goto __error1;
2141 }
2142 err = snd_card_file_add(pcm->card, file);
2143 if (err < 0)
2144 goto __error1;
2145 if (!try_module_get(pcm->card->module)) {
2146 err = -EFAULT;
2147 goto __error2;
2148 }
2149 init_waitqueue_entry(&wait, current);
2150 add_wait_queue(&pcm->open_wait, &wait);
2151 mutex_lock(&pcm->open_mutex);
2152 while (1) {
2153 err = snd_pcm_open_file(file, pcm, stream);
2154 if (err >= 0)
2155 break;
2156 if (err == -EAGAIN) {
2157 if (file->f_flags & O_NONBLOCK) {
2158 err = -EBUSY;
2159 break;
2160 }
2161 } else
2162 break;
2163 set_current_state(TASK_INTERRUPTIBLE);
2164 mutex_unlock(&pcm->open_mutex);
2165 schedule();
2166 mutex_lock(&pcm->open_mutex);
2167 if (signal_pending(current)) {
2168 err = -ERESTARTSYS;
2169 break;
2170 }
2171 }
2172 remove_wait_queue(&pcm->open_wait, &wait);
2173 mutex_unlock(&pcm->open_mutex);
2174 if (err < 0)
2175 goto __error;
2176 return err;
2177
2178 __error:
2179 module_put(pcm->card->module);
2180 __error2:
2181 snd_card_file_remove(pcm->card, file);
2182 __error1:
2183 return err;
2184 }
2185
2186 static int snd_pcm_release(struct inode *inode, struct file *file)
2187 {
2188 struct snd_pcm *pcm;
2189 struct snd_pcm_substream *substream;
2190 struct snd_pcm_file *pcm_file;
2191
2192 pcm_file = file->private_data;
2193 substream = pcm_file->substream;
2194 if (snd_BUG_ON(!substream))
2195 return -ENXIO;
2196 pcm = substream->pcm;
2197 mutex_lock(&pcm->open_mutex);
2198 snd_pcm_release_substream(substream);
2199 kfree(pcm_file);
2200 mutex_unlock(&pcm->open_mutex);
2201 wake_up(&pcm->open_wait);
2202 module_put(pcm->card->module);
2203 snd_card_file_remove(pcm->card, file);
2204 return 0;
2205 }
2206
2207 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2208 snd_pcm_uframes_t frames)
2209 {
2210 struct snd_pcm_runtime *runtime = substream->runtime;
2211 snd_pcm_sframes_t appl_ptr;
2212 snd_pcm_sframes_t ret;
2213 snd_pcm_sframes_t hw_avail;
2214
2215 if (frames == 0)
2216 return 0;
2217
2218 snd_pcm_stream_lock_irq(substream);
2219 switch (runtime->status->state) {
2220 case SNDRV_PCM_STATE_PREPARED:
2221 break;
2222 case SNDRV_PCM_STATE_DRAINING:
2223 case SNDRV_PCM_STATE_RUNNING:
2224 if (snd_pcm_update_hw_ptr(substream) >= 0)
2225 break;
2226 /* Fall through */
2227 case SNDRV_PCM_STATE_XRUN:
2228 ret = -EPIPE;
2229 goto __end;
2230 case SNDRV_PCM_STATE_SUSPENDED:
2231 ret = -ESTRPIPE;
2232 goto __end;
2233 default:
2234 ret = -EBADFD;
2235 goto __end;
2236 }
2237
2238 hw_avail = snd_pcm_playback_hw_avail(runtime);
2239 if (hw_avail <= 0) {
2240 ret = 0;
2241 goto __end;
2242 }
2243 if (frames > (snd_pcm_uframes_t)hw_avail)
2244 frames = hw_avail;
2245 appl_ptr = runtime->control->appl_ptr - frames;
2246 if (appl_ptr < 0)
2247 appl_ptr += runtime->boundary;
2248 runtime->control->appl_ptr = appl_ptr;
2249 ret = frames;
2250 __end:
2251 snd_pcm_stream_unlock_irq(substream);
2252 return ret;
2253 }
2254
2255 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2256 snd_pcm_uframes_t frames)
2257 {
2258 struct snd_pcm_runtime *runtime = substream->runtime;
2259 snd_pcm_sframes_t appl_ptr;
2260 snd_pcm_sframes_t ret;
2261 snd_pcm_sframes_t hw_avail;
2262
2263 if (frames == 0)
2264 return 0;
2265
2266 snd_pcm_stream_lock_irq(substream);
2267 switch (runtime->status->state) {
2268 case SNDRV_PCM_STATE_PREPARED:
2269 case SNDRV_PCM_STATE_DRAINING:
2270 break;
2271 case SNDRV_PCM_STATE_RUNNING:
2272 if (snd_pcm_update_hw_ptr(substream) >= 0)
2273 break;
2274 /* Fall through */
2275 case SNDRV_PCM_STATE_XRUN:
2276 ret = -EPIPE;
2277 goto __end;
2278 case SNDRV_PCM_STATE_SUSPENDED:
2279 ret = -ESTRPIPE;
2280 goto __end;
2281 default:
2282 ret = -EBADFD;
2283 goto __end;
2284 }
2285
2286 hw_avail = snd_pcm_capture_hw_avail(runtime);
2287 if (hw_avail <= 0) {
2288 ret = 0;
2289 goto __end;
2290 }
2291 if (frames > (snd_pcm_uframes_t)hw_avail)
2292 frames = hw_avail;
2293 appl_ptr = runtime->control->appl_ptr - frames;
2294 if (appl_ptr < 0)
2295 appl_ptr += runtime->boundary;
2296 runtime->control->appl_ptr = appl_ptr;
2297 ret = frames;
2298 __end:
2299 snd_pcm_stream_unlock_irq(substream);
2300 return ret;
2301 }
2302
2303 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2304 snd_pcm_uframes_t frames)
2305 {
2306 struct snd_pcm_runtime *runtime = substream->runtime;
2307 snd_pcm_sframes_t appl_ptr;
2308 snd_pcm_sframes_t ret;
2309 snd_pcm_sframes_t avail;
2310
2311 if (frames == 0)
2312 return 0;
2313
2314 snd_pcm_stream_lock_irq(substream);
2315 switch (runtime->status->state) {
2316 case SNDRV_PCM_STATE_PREPARED:
2317 case SNDRV_PCM_STATE_PAUSED:
2318 break;
2319 case SNDRV_PCM_STATE_DRAINING:
2320 case SNDRV_PCM_STATE_RUNNING:
2321 if (snd_pcm_update_hw_ptr(substream) >= 0)
2322 break;
2323 /* Fall through */
2324 case SNDRV_PCM_STATE_XRUN:
2325 ret = -EPIPE;
2326 goto __end;
2327 case SNDRV_PCM_STATE_SUSPENDED:
2328 ret = -ESTRPIPE;
2329 goto __end;
2330 default:
2331 ret = -EBADFD;
2332 goto __end;
2333 }
2334
2335 avail = snd_pcm_playback_avail(runtime);
2336 if (avail <= 0) {
2337 ret = 0;
2338 goto __end;
2339 }
2340 if (frames > (snd_pcm_uframes_t)avail)
2341 frames = avail;
2342 appl_ptr = runtime->control->appl_ptr + frames;
2343 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2344 appl_ptr -= runtime->boundary;
2345 runtime->control->appl_ptr = appl_ptr;
2346 ret = frames;
2347 __end:
2348 snd_pcm_stream_unlock_irq(substream);
2349 return ret;
2350 }
2351
2352 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2353 snd_pcm_uframes_t frames)
2354 {
2355 struct snd_pcm_runtime *runtime = substream->runtime;
2356 snd_pcm_sframes_t appl_ptr;
2357 snd_pcm_sframes_t ret;
2358 snd_pcm_sframes_t avail;
2359
2360 if (frames == 0)
2361 return 0;
2362
2363 snd_pcm_stream_lock_irq(substream);
2364 switch (runtime->status->state) {
2365 case SNDRV_PCM_STATE_PREPARED:
2366 case SNDRV_PCM_STATE_DRAINING:
2367 case SNDRV_PCM_STATE_PAUSED:
2368 break;
2369 case SNDRV_PCM_STATE_RUNNING:
2370 if (snd_pcm_update_hw_ptr(substream) >= 0)
2371 break;
2372 /* Fall through */
2373 case SNDRV_PCM_STATE_XRUN:
2374 ret = -EPIPE;
2375 goto __end;
2376 case SNDRV_PCM_STATE_SUSPENDED:
2377 ret = -ESTRPIPE;
2378 goto __end;
2379 default:
2380 ret = -EBADFD;
2381 goto __end;
2382 }
2383
2384 avail = snd_pcm_capture_avail(runtime);
2385 if (avail <= 0) {
2386 ret = 0;
2387 goto __end;
2388 }
2389 if (frames > (snd_pcm_uframes_t)avail)
2390 frames = avail;
2391 appl_ptr = runtime->control->appl_ptr + frames;
2392 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2393 appl_ptr -= runtime->boundary;
2394 runtime->control->appl_ptr = appl_ptr;
2395 ret = frames;
2396 __end:
2397 snd_pcm_stream_unlock_irq(substream);
2398 return ret;
2399 }
2400
2401 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2402 {
2403 struct snd_pcm_runtime *runtime = substream->runtime;
2404 int err;
2405
2406 snd_pcm_stream_lock_irq(substream);
2407 switch (runtime->status->state) {
2408 case SNDRV_PCM_STATE_DRAINING:
2409 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2410 goto __badfd;
2411 case SNDRV_PCM_STATE_RUNNING:
2412 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2413 break;
2414 /* Fall through */
2415 case SNDRV_PCM_STATE_PREPARED:
2416 case SNDRV_PCM_STATE_SUSPENDED:
2417 err = 0;
2418 break;
2419 case SNDRV_PCM_STATE_XRUN:
2420 err = -EPIPE;
2421 break;
2422 default:
2423 __badfd:
2424 err = -EBADFD;
2425 break;
2426 }
2427 snd_pcm_stream_unlock_irq(substream);
2428 return err;
2429 }
2430
2431 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2432 snd_pcm_sframes_t __user *res)
2433 {
2434 struct snd_pcm_runtime *runtime = substream->runtime;
2435 int err;
2436 snd_pcm_sframes_t n = 0;
2437
2438 snd_pcm_stream_lock_irq(substream);
2439 switch (runtime->status->state) {
2440 case SNDRV_PCM_STATE_DRAINING:
2441 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2442 goto __badfd;
2443 case SNDRV_PCM_STATE_RUNNING:
2444 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2445 break;
2446 /* Fall through */
2447 case SNDRV_PCM_STATE_PREPARED:
2448 case SNDRV_PCM_STATE_SUSPENDED:
2449 err = 0;
2450 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2451 n = snd_pcm_playback_hw_avail(runtime);
2452 else
2453 n = snd_pcm_capture_avail(runtime);
2454 n += runtime->delay;
2455 break;
2456 case SNDRV_PCM_STATE_XRUN:
2457 err = -EPIPE;
2458 break;
2459 default:
2460 __badfd:
2461 err = -EBADFD;
2462 break;
2463 }
2464 snd_pcm_stream_unlock_irq(substream);
2465 if (!err)
2466 if (put_user(n, res))
2467 err = -EFAULT;
2468 return err;
2469 }
2470
2471 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2472 struct snd_pcm_sync_ptr __user *_sync_ptr)
2473 {
2474 struct snd_pcm_runtime *runtime = substream->runtime;
2475 struct snd_pcm_sync_ptr sync_ptr;
2476 volatile struct snd_pcm_mmap_status *status;
2477 volatile struct snd_pcm_mmap_control *control;
2478 int err;
2479
2480 memset(&sync_ptr, 0, sizeof(sync_ptr));
2481 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2482 return -EFAULT;
2483 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2484 return -EFAULT;
2485 status = runtime->status;
2486 control = runtime->control;
2487 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2488 err = snd_pcm_hwsync(substream);
2489 if (err < 0)
2490 return err;
2491 }
2492 snd_pcm_stream_lock_irq(substream);
2493 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2494 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2495 else
2496 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2497 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2498 control->avail_min = sync_ptr.c.control.avail_min;
2499 else
2500 sync_ptr.c.control.avail_min = control->avail_min;
2501 sync_ptr.s.status.state = status->state;
2502 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2503 sync_ptr.s.status.tstamp = status->tstamp;
2504 sync_ptr.s.status.suspended_state = status->suspended_state;
2505 snd_pcm_stream_unlock_irq(substream);
2506 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2507 return -EFAULT;
2508 return 0;
2509 }
2510
2511 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2512 {
2513 struct snd_pcm_runtime *runtime = substream->runtime;
2514 int arg;
2515
2516 if (get_user(arg, _arg))
2517 return -EFAULT;
2518 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2519 return -EINVAL;
2520 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2521 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2522 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2523 return 0;
2524 }
2525
2526 static int snd_pcm_common_ioctl1(struct file *file,
2527 struct snd_pcm_substream *substream,
2528 unsigned int cmd, void __user *arg)
2529 {
2530 switch (cmd) {
2531 case SNDRV_PCM_IOCTL_PVERSION:
2532 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2533 case SNDRV_PCM_IOCTL_INFO:
2534 return snd_pcm_info_user(substream, arg);
2535 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2536 return 0;
2537 case SNDRV_PCM_IOCTL_TTSTAMP:
2538 return snd_pcm_tstamp(substream, arg);
2539 case SNDRV_PCM_IOCTL_HW_REFINE:
2540 return snd_pcm_hw_refine_user(substream, arg);
2541 case SNDRV_PCM_IOCTL_HW_PARAMS:
2542 return snd_pcm_hw_params_user(substream, arg);
2543 case SNDRV_PCM_IOCTL_HW_FREE:
2544 return snd_pcm_hw_free(substream);
2545 case SNDRV_PCM_IOCTL_SW_PARAMS:
2546 return snd_pcm_sw_params_user(substream, arg);
2547 case SNDRV_PCM_IOCTL_STATUS:
2548 return snd_pcm_status_user(substream, arg);
2549 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2550 return snd_pcm_channel_info_user(substream, arg);
2551 case SNDRV_PCM_IOCTL_PREPARE:
2552 return snd_pcm_prepare(substream, file);
2553 case SNDRV_PCM_IOCTL_RESET:
2554 return snd_pcm_reset(substream);
2555 case SNDRV_PCM_IOCTL_START:
2556 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2557 case SNDRV_PCM_IOCTL_LINK:
2558 return snd_pcm_link(substream, (int)(unsigned long) arg);
2559 case SNDRV_PCM_IOCTL_UNLINK:
2560 return snd_pcm_unlink(substream);
2561 case SNDRV_PCM_IOCTL_RESUME:
2562 return snd_pcm_resume(substream);
2563 case SNDRV_PCM_IOCTL_XRUN:
2564 return snd_pcm_xrun(substream);
2565 case SNDRV_PCM_IOCTL_HWSYNC:
2566 return snd_pcm_hwsync(substream);
2567 case SNDRV_PCM_IOCTL_DELAY:
2568 return snd_pcm_delay(substream, arg);
2569 case SNDRV_PCM_IOCTL_SYNC_PTR:
2570 return snd_pcm_sync_ptr(substream, arg);
2571 #ifdef CONFIG_SND_SUPPORT_OLD_API
2572 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2573 return snd_pcm_hw_refine_old_user(substream, arg);
2574 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2575 return snd_pcm_hw_params_old_user(substream, arg);
2576 #endif
2577 case SNDRV_PCM_IOCTL_DRAIN:
2578 return snd_pcm_drain(substream, file);
2579 case SNDRV_PCM_IOCTL_DROP:
2580 return snd_pcm_drop(substream);
2581 case SNDRV_PCM_IOCTL_PAUSE:
2582 {
2583 int res;
2584 snd_pcm_stream_lock_irq(substream);
2585 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2586 snd_pcm_stream_unlock_irq(substream);
2587 return res;
2588 }
2589 }
2590 snd_printd("unknown ioctl = 0x%x\n", cmd);
2591 return -ENOTTY;
2592 }
2593
2594 static int snd_pcm_playback_ioctl1(struct file *file,
2595 struct snd_pcm_substream *substream,
2596 unsigned int cmd, void __user *arg)
2597 {
2598 if (snd_BUG_ON(!substream))
2599 return -ENXIO;
2600 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2601 return -EINVAL;
2602 switch (cmd) {
2603 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2604 {
2605 struct snd_xferi xferi;
2606 struct snd_xferi __user *_xferi = arg;
2607 struct snd_pcm_runtime *runtime = substream->runtime;
2608 snd_pcm_sframes_t result;
2609 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2610 return -EBADFD;
2611 if (put_user(0, &_xferi->result))
2612 return -EFAULT;
2613 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2614 return -EFAULT;
2615 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2616 __put_user(result, &_xferi->result);
2617 return result < 0 ? result : 0;
2618 }
2619 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2620 {
2621 struct snd_xfern xfern;
2622 struct snd_xfern __user *_xfern = arg;
2623 struct snd_pcm_runtime *runtime = substream->runtime;
2624 void __user **bufs;
2625 snd_pcm_sframes_t result;
2626 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2627 return -EBADFD;
2628 if (runtime->channels > 128)
2629 return -EINVAL;
2630 if (put_user(0, &_xfern->result))
2631 return -EFAULT;
2632 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2633 return -EFAULT;
2634
2635 bufs = memdup_user(xfern.bufs,
2636 sizeof(void *) * runtime->channels);
2637 if (IS_ERR(bufs))
2638 return PTR_ERR(bufs);
2639 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2640 kfree(bufs);
2641 __put_user(result, &_xfern->result);
2642 return result < 0 ? result : 0;
2643 }
2644 case SNDRV_PCM_IOCTL_REWIND:
2645 {
2646 snd_pcm_uframes_t frames;
2647 snd_pcm_uframes_t __user *_frames = arg;
2648 snd_pcm_sframes_t result;
2649 if (get_user(frames, _frames))
2650 return -EFAULT;
2651 if (put_user(0, _frames))
2652 return -EFAULT;
2653 result = snd_pcm_playback_rewind(substream, frames);
2654 __put_user(result, _frames);
2655 return result < 0 ? result : 0;
2656 }
2657 case SNDRV_PCM_IOCTL_FORWARD:
2658 {
2659 snd_pcm_uframes_t frames;
2660 snd_pcm_uframes_t __user *_frames = arg;
2661 snd_pcm_sframes_t result;
2662 if (get_user(frames, _frames))
2663 return -EFAULT;
2664 if (put_user(0, _frames))
2665 return -EFAULT;
2666 result = snd_pcm_playback_forward(substream, frames);
2667 __put_user(result, _frames);
2668 return result < 0 ? result : 0;
2669 }
2670 }
2671 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2672 }
2673
2674 static int snd_pcm_capture_ioctl1(struct file *file,
2675 struct snd_pcm_substream *substream,
2676 unsigned int cmd, void __user *arg)
2677 {
2678 if (snd_BUG_ON(!substream))
2679 return -ENXIO;
2680 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2681 return -EINVAL;
2682 switch (cmd) {
2683 case SNDRV_PCM_IOCTL_READI_FRAMES:
2684 {
2685 struct snd_xferi xferi;
2686 struct snd_xferi __user *_xferi = arg;
2687 struct snd_pcm_runtime *runtime = substream->runtime;
2688 snd_pcm_sframes_t result;
2689 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2690 return -EBADFD;
2691 if (put_user(0, &_xferi->result))
2692 return -EFAULT;
2693 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2694 return -EFAULT;
2695 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2696 __put_user(result, &_xferi->result);
2697 return result < 0 ? result : 0;
2698 }
2699 case SNDRV_PCM_IOCTL_READN_FRAMES:
2700 {
2701 struct snd_xfern xfern;
2702 struct snd_xfern __user *_xfern = arg;
2703 struct snd_pcm_runtime *runtime = substream->runtime;
2704 void *bufs;
2705 snd_pcm_sframes_t result;
2706 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2707 return -EBADFD;
2708 if (runtime->channels > 128)
2709 return -EINVAL;
2710 if (put_user(0, &_xfern->result))
2711 return -EFAULT;
2712 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2713 return -EFAULT;
2714
2715 bufs = memdup_user(xfern.bufs,
2716 sizeof(void *) * runtime->channels);
2717 if (IS_ERR(bufs))
2718 return PTR_ERR(bufs);
2719 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2720 kfree(bufs);
2721 __put_user(result, &_xfern->result);
2722 return result < 0 ? result : 0;
2723 }
2724 case SNDRV_PCM_IOCTL_REWIND:
2725 {
2726 snd_pcm_uframes_t frames;
2727 snd_pcm_uframes_t __user *_frames = arg;
2728 snd_pcm_sframes_t result;
2729 if (get_user(frames, _frames))
2730 return -EFAULT;
2731 if (put_user(0, _frames))
2732 return -EFAULT;
2733 result = snd_pcm_capture_rewind(substream, frames);
2734 __put_user(result, _frames);
2735 return result < 0 ? result : 0;
2736 }
2737 case SNDRV_PCM_IOCTL_FORWARD:
2738 {
2739 snd_pcm_uframes_t frames;
2740 snd_pcm_uframes_t __user *_frames = arg;
2741 snd_pcm_sframes_t result;
2742 if (get_user(frames, _frames))
2743 return -EFAULT;
2744 if (put_user(0, _frames))
2745 return -EFAULT;
2746 result = snd_pcm_capture_forward(substream, frames);
2747 __put_user(result, _frames);
2748 return result < 0 ? result : 0;
2749 }
2750 }
2751 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2752 }
2753
2754 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2755 unsigned long arg)
2756 {
2757 struct snd_pcm_file *pcm_file;
2758
2759 pcm_file = file->private_data;
2760
2761 if (((cmd >> 8) & 0xff) != 'A')
2762 return -ENOTTY;
2763
2764 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2765 (void __user *)arg);
2766 }
2767
2768 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2769 unsigned long arg)
2770 {
2771 struct snd_pcm_file *pcm_file;
2772
2773 pcm_file = file->private_data;
2774
2775 if (((cmd >> 8) & 0xff) != 'A')
2776 return -ENOTTY;
2777
2778 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2779 (void __user *)arg);
2780 }
2781
2782 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2783 unsigned int cmd, void *arg)
2784 {
2785 mm_segment_t fs;
2786 int result;
2787
2788 fs = snd_enter_user();
2789 switch (substream->stream) {
2790 case SNDRV_PCM_STREAM_PLAYBACK:
2791 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2792 (void __user *)arg);
2793 break;
2794 case SNDRV_PCM_STREAM_CAPTURE:
2795 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2796 (void __user *)arg);
2797 break;
2798 default:
2799 result = -EINVAL;
2800 break;
2801 }
2802 snd_leave_user(fs);
2803 return result;
2804 }
2805
2806 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2807
2808 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2809 loff_t * offset)
2810 {
2811 struct snd_pcm_file *pcm_file;
2812 struct snd_pcm_substream *substream;
2813 struct snd_pcm_runtime *runtime;
2814 snd_pcm_sframes_t result;
2815
2816 pcm_file = file->private_data;
2817 substream = pcm_file->substream;
2818 if (PCM_RUNTIME_CHECK(substream))
2819 return -ENXIO;
2820 runtime = substream->runtime;
2821 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2822 return -EBADFD;
2823 if (!frame_aligned(runtime, count))
2824 return -EINVAL;
2825 count = bytes_to_frames(runtime, count);
2826 result = snd_pcm_lib_read(substream, buf, count);
2827 if (result > 0)
2828 result = frames_to_bytes(runtime, result);
2829 return result;
2830 }
2831
2832 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2833 size_t count, loff_t * offset)
2834 {
2835 struct snd_pcm_file *pcm_file;
2836 struct snd_pcm_substream *substream;
2837 struct snd_pcm_runtime *runtime;
2838 snd_pcm_sframes_t result;
2839
2840 pcm_file = file->private_data;
2841 substream = pcm_file->substream;
2842 if (PCM_RUNTIME_CHECK(substream))
2843 return -ENXIO;
2844 runtime = substream->runtime;
2845 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2846 return -EBADFD;
2847 if (!frame_aligned(runtime, count))
2848 return -EINVAL;
2849 count = bytes_to_frames(runtime, count);
2850 result = snd_pcm_lib_write(substream, buf, count);
2851 if (result > 0)
2852 result = frames_to_bytes(runtime, result);
2853 return result;
2854 }
2855
2856 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2857 unsigned long nr_segs, loff_t pos)
2858
2859 {
2860 struct snd_pcm_file *pcm_file;
2861 struct snd_pcm_substream *substream;
2862 struct snd_pcm_runtime *runtime;
2863 snd_pcm_sframes_t result;
2864 unsigned long i;
2865 void __user **bufs;
2866 snd_pcm_uframes_t frames;
2867
2868 pcm_file = iocb->ki_filp->private_data;
2869 substream = pcm_file->substream;
2870 if (PCM_RUNTIME_CHECK(substream))
2871 return -ENXIO;
2872 runtime = substream->runtime;
2873 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2874 return -EBADFD;
2875 if (nr_segs > 1024 || nr_segs != runtime->channels)
2876 return -EINVAL;
2877 if (!frame_aligned(runtime, iov->iov_len))
2878 return -EINVAL;
2879 frames = bytes_to_samples(runtime, iov->iov_len);
2880 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2881 if (bufs == NULL)
2882 return -ENOMEM;
2883 for (i = 0; i < nr_segs; ++i)
2884 bufs[i] = iov[i].iov_base;
2885 result = snd_pcm_lib_readv(substream, bufs, frames);
2886 if (result > 0)
2887 result = frames_to_bytes(runtime, result);
2888 kfree(bufs);
2889 return result;
2890 }
2891
2892 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2893 unsigned long nr_segs, loff_t pos)
2894 {
2895 struct snd_pcm_file *pcm_file;
2896 struct snd_pcm_substream *substream;
2897 struct snd_pcm_runtime *runtime;
2898 snd_pcm_sframes_t result;
2899 unsigned long i;
2900 void __user **bufs;
2901 snd_pcm_uframes_t frames;
2902
2903 pcm_file = iocb->ki_filp->private_data;
2904 substream = pcm_file->substream;
2905 if (PCM_RUNTIME_CHECK(substream))
2906 return -ENXIO;
2907 runtime = substream->runtime;
2908 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2909 return -EBADFD;
2910 if (nr_segs > 128 || nr_segs != runtime->channels ||
2911 !frame_aligned(runtime, iov->iov_len))
2912 return -EINVAL;
2913 frames = bytes_to_samples(runtime, iov->iov_len);
2914 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2915 if (bufs == NULL)
2916 return -ENOMEM;
2917 for (i = 0; i < nr_segs; ++i)
2918 bufs[i] = iov[i].iov_base;
2919 result = snd_pcm_lib_writev(substream, bufs, frames);
2920 if (result > 0)
2921 result = frames_to_bytes(runtime, result);
2922 kfree(bufs);
2923 return result;
2924 }
2925
2926 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2927 {
2928 struct snd_pcm_file *pcm_file;
2929 struct snd_pcm_substream *substream;
2930 struct snd_pcm_runtime *runtime;
2931 unsigned int mask;
2932 snd_pcm_uframes_t avail;
2933
2934 pcm_file = file->private_data;
2935
2936 substream = pcm_file->substream;
2937 if (PCM_RUNTIME_CHECK(substream))
2938 return -ENXIO;
2939 runtime = substream->runtime;
2940
2941 poll_wait(file, &runtime->sleep, wait);
2942
2943 snd_pcm_stream_lock_irq(substream);
2944 avail = snd_pcm_playback_avail(runtime);
2945 switch (runtime->status->state) {
2946 case SNDRV_PCM_STATE_RUNNING:
2947 case SNDRV_PCM_STATE_PREPARED:
2948 case SNDRV_PCM_STATE_PAUSED:
2949 if (avail >= runtime->control->avail_min) {
2950 mask = POLLOUT | POLLWRNORM;
2951 break;
2952 }
2953 /* Fall through */
2954 case SNDRV_PCM_STATE_DRAINING:
2955 mask = 0;
2956 break;
2957 default:
2958 mask = POLLOUT | POLLWRNORM | POLLERR;
2959 break;
2960 }
2961 snd_pcm_stream_unlock_irq(substream);
2962 return mask;
2963 }
2964
2965 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2966 {
2967 struct snd_pcm_file *pcm_file;
2968 struct snd_pcm_substream *substream;
2969 struct snd_pcm_runtime *runtime;
2970 unsigned int mask;
2971 snd_pcm_uframes_t avail;
2972
2973 pcm_file = file->private_data;
2974
2975 substream = pcm_file->substream;
2976 if (PCM_RUNTIME_CHECK(substream))
2977 return -ENXIO;
2978 runtime = substream->runtime;
2979
2980 poll_wait(file, &runtime->sleep, wait);
2981
2982 snd_pcm_stream_lock_irq(substream);
2983 avail = snd_pcm_capture_avail(runtime);
2984 switch (runtime->status->state) {
2985 case SNDRV_PCM_STATE_RUNNING:
2986 case SNDRV_PCM_STATE_PREPARED:
2987 case SNDRV_PCM_STATE_PAUSED:
2988 if (avail >= runtime->control->avail_min) {
2989 mask = POLLIN | POLLRDNORM;
2990 break;
2991 }
2992 mask = 0;
2993 break;
2994 case SNDRV_PCM_STATE_DRAINING:
2995 if (avail > 0) {
2996 mask = POLLIN | POLLRDNORM;
2997 break;
2998 }
2999 /* Fall through */
3000 default:
3001 mask = POLLIN | POLLRDNORM | POLLERR;
3002 break;
3003 }
3004 snd_pcm_stream_unlock_irq(substream);
3005 return mask;
3006 }
3007
3008 /*
3009 * mmap support
3010 */
3011
3012 /*
3013 * Only on coherent architectures, we can mmap the status and the control records
3014 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3015 */
3016 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3017 /*
3018 * mmap status record
3019 */
3020 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3021 struct vm_fault *vmf)
3022 {
3023 struct snd_pcm_substream *substream = area->vm_private_data;
3024 struct snd_pcm_runtime *runtime;
3025
3026 if (substream == NULL)
3027 return VM_FAULT_SIGBUS;
3028 runtime = substream->runtime;
3029 vmf->page = virt_to_page(runtime->status);
3030 get_page(vmf->page);
3031 return 0;
3032 }
3033
3034 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3035 {
3036 .fault = snd_pcm_mmap_status_fault,
3037 };
3038
3039 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3040 struct vm_area_struct *area)
3041 {
3042 long size;
3043 if (!(area->vm_flags & VM_READ))
3044 return -EINVAL;
3045 size = area->vm_end - area->vm_start;
3046 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3047 return -EINVAL;
3048 area->vm_ops = &snd_pcm_vm_ops_status;
3049 area->vm_private_data = substream;
3050 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3051 return 0;
3052 }
3053
3054 /*
3055 * mmap control record
3056 */
3057 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3058 struct vm_fault *vmf)
3059 {
3060 struct snd_pcm_substream *substream = area->vm_private_data;
3061 struct snd_pcm_runtime *runtime;
3062
3063 if (substream == NULL)
3064 return VM_FAULT_SIGBUS;
3065 runtime = substream->runtime;
3066 vmf->page = virt_to_page(runtime->control);
3067 get_page(vmf->page);
3068 return 0;
3069 }
3070
3071 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3072 {
3073 .fault = snd_pcm_mmap_control_fault,
3074 };
3075
3076 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3077 struct vm_area_struct *area)
3078 {
3079 long size;
3080 if (!(area->vm_flags & VM_READ))
3081 return -EINVAL;
3082 size = area->vm_end - area->vm_start;
3083 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3084 return -EINVAL;
3085 area->vm_ops = &snd_pcm_vm_ops_control;
3086 area->vm_private_data = substream;
3087 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3088 return 0;
3089 }
3090 #else /* ! coherent mmap */
3091 /*
3092 * don't support mmap for status and control records.
3093 */
3094 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3095 struct vm_area_struct *area)
3096 {
3097 return -ENXIO;
3098 }
3099 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3100 struct vm_area_struct *area)
3101 {
3102 return -ENXIO;
3103 }
3104 #endif /* coherent mmap */
3105
3106 static inline struct page *
3107 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3108 {
3109 void *vaddr = substream->runtime->dma_area + ofs;
3110 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3111 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3112 return virt_to_page(CAC_ADDR(vaddr));
3113 #endif
3114 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3115 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3116 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3117 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3118 /* assume dma_handle set via pfn_to_phys() in
3119 * mm/dma-noncoherent.c
3120 */
3121 return pfn_to_page(addr >> PAGE_SHIFT);
3122 }
3123 #endif
3124 return virt_to_page(vaddr);
3125 }
3126
3127 /*
3128 * fault callback for mmapping a RAM page
3129 */
3130 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3131 struct vm_fault *vmf)
3132 {
3133 struct snd_pcm_substream *substream = area->vm_private_data;
3134 struct snd_pcm_runtime *runtime;
3135 unsigned long offset;
3136 struct page * page;
3137 size_t dma_bytes;
3138
3139 if (substream == NULL)
3140 return VM_FAULT_SIGBUS;
3141 runtime = substream->runtime;
3142 offset = vmf->pgoff << PAGE_SHIFT;
3143 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3144 if (offset > dma_bytes - PAGE_SIZE)
3145 return VM_FAULT_SIGBUS;
3146 if (substream->ops->page)
3147 page = substream->ops->page(substream, offset);
3148 else
3149 page = snd_pcm_default_page_ops(substream, offset);
3150 if (!page)
3151 return VM_FAULT_SIGBUS;
3152 get_page(page);
3153 vmf->page = page;
3154 return 0;
3155 }
3156
3157 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3158 .open = snd_pcm_mmap_data_open,
3159 .close = snd_pcm_mmap_data_close,
3160 };
3161
3162 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3163 .open = snd_pcm_mmap_data_open,
3164 .close = snd_pcm_mmap_data_close,
3165 .fault = snd_pcm_mmap_data_fault,
3166 };
3167
3168 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3169 /* This should be defined / handled globally! */
3170 #ifdef CONFIG_ARM
3171 #define ARCH_HAS_DMA_MMAP_COHERENT
3172 #endif
3173 #endif
3174
3175 /*
3176 * mmap the DMA buffer on RAM
3177 */
3178 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3179 struct vm_area_struct *area)
3180 {
3181 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3182 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3183 if (!substream->ops->page &&
3184 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3185 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3186 area,
3187 substream->runtime->dma_area,
3188 substream->runtime->dma_addr,
3189 area->vm_end - area->vm_start);
3190 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3191 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3192 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3193 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3194 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3195 /* mmap with fault handler */
3196 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3197 return 0;
3198 }
3199 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3200
3201 /*
3202 * mmap the DMA buffer on I/O memory area
3203 */
3204 #if SNDRV_PCM_INFO_MMAP_IOMEM
3205 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3206 struct vm_area_struct *area)
3207 {
3208 long size;
3209 unsigned long offset;
3210
3211 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3212 area->vm_flags |= VM_IO;
3213 size = area->vm_end - area->vm_start;
3214 offset = area->vm_pgoff << PAGE_SHIFT;
3215 if (io_remap_pfn_range(area, area->vm_start,
3216 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3217 size, area->vm_page_prot))
3218 return -EAGAIN;
3219 return 0;
3220 }
3221
3222 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3223 #endif /* SNDRV_PCM_INFO_MMAP */
3224
3225 /*
3226 * mmap DMA buffer
3227 */
3228 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3229 struct vm_area_struct *area)
3230 {
3231 struct snd_pcm_runtime *runtime;
3232 long size;
3233 unsigned long offset;
3234 size_t dma_bytes;
3235 int err;
3236
3237 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3238 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3239 return -EINVAL;
3240 } else {
3241 if (!(area->vm_flags & VM_READ))
3242 return -EINVAL;
3243 }
3244 runtime = substream->runtime;
3245 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3246 return -EBADFD;
3247 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3248 return -ENXIO;
3249 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3250 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3251 return -EINVAL;
3252 size = area->vm_end - area->vm_start;
3253 offset = area->vm_pgoff << PAGE_SHIFT;
3254 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3255 if ((size_t)size > dma_bytes)
3256 return -EINVAL;
3257 if (offset > dma_bytes - size)
3258 return -EINVAL;
3259
3260 area->vm_ops = &snd_pcm_vm_ops_data;
3261 area->vm_private_data = substream;
3262 if (substream->ops->mmap)
3263 err = substream->ops->mmap(substream, area);
3264 else
3265 err = snd_pcm_lib_default_mmap(substream, area);
3266 if (!err)
3267 atomic_inc(&substream->mmap_count);
3268 return err;
3269 }
3270
3271 EXPORT_SYMBOL(snd_pcm_mmap_data);
3272
3273 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3274 {
3275 struct snd_pcm_file * pcm_file;
3276 struct snd_pcm_substream *substream;
3277 unsigned long offset;
3278
3279 pcm_file = file->private_data;
3280 substream = pcm_file->substream;
3281 if (PCM_RUNTIME_CHECK(substream))
3282 return -ENXIO;
3283
3284 offset = area->vm_pgoff << PAGE_SHIFT;
3285 switch (offset) {
3286 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3287 if (pcm_file->no_compat_mmap)
3288 return -ENXIO;
3289 return snd_pcm_mmap_status(substream, file, area);
3290 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3291 if (pcm_file->no_compat_mmap)
3292 return -ENXIO;
3293 return snd_pcm_mmap_control(substream, file, area);
3294 default:
3295 return snd_pcm_mmap_data(substream, file, area);
3296 }
3297 return 0;
3298 }
3299
3300 static int snd_pcm_fasync(int fd, struct file * file, int on)
3301 {
3302 struct snd_pcm_file * pcm_file;
3303 struct snd_pcm_substream *substream;
3304 struct snd_pcm_runtime *runtime;
3305
3306 pcm_file = file->private_data;
3307 substream = pcm_file->substream;
3308 if (PCM_RUNTIME_CHECK(substream))
3309 return -ENXIO;
3310 runtime = substream->runtime;
3311 return fasync_helper(fd, file, on, &runtime->fasync);
3312 }
3313
3314 /*
3315 * ioctl32 compat
3316 */
3317 #ifdef CONFIG_COMPAT
3318 #include "pcm_compat.c"
3319 #else
3320 #define snd_pcm_ioctl_compat NULL
3321 #endif
3322
3323 /*
3324 * To be removed helpers to keep binary compatibility
3325 */
3326
3327 #ifdef CONFIG_SND_SUPPORT_OLD_API
3328 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3329 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3330
3331 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3332 struct snd_pcm_hw_params_old *oparams)
3333 {
3334 unsigned int i;
3335
3336 memset(params, 0, sizeof(*params));
3337 params->flags = oparams->flags;
3338 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3339 params->masks[i].bits[0] = oparams->masks[i];
3340 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3341 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3342 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3343 params->info = oparams->info;
3344 params->msbits = oparams->msbits;
3345 params->rate_num = oparams->rate_num;
3346 params->rate_den = oparams->rate_den;
3347 params->fifo_size = oparams->fifo_size;
3348 }
3349
3350 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3351 struct snd_pcm_hw_params *params)
3352 {
3353 unsigned int i;
3354
3355 memset(oparams, 0, sizeof(*oparams));
3356 oparams->flags = params->flags;
3357 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3358 oparams->masks[i] = params->masks[i].bits[0];
3359 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3360 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3361 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3362 oparams->info = params->info;
3363 oparams->msbits = params->msbits;
3364 oparams->rate_num = params->rate_num;
3365 oparams->rate_den = params->rate_den;
3366 oparams->fifo_size = params->fifo_size;
3367 }
3368
3369 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3370 struct snd_pcm_hw_params_old __user * _oparams)
3371 {
3372 struct snd_pcm_hw_params *params;
3373 struct snd_pcm_hw_params_old *oparams = NULL;
3374 int err;
3375
3376 params = kmalloc(sizeof(*params), GFP_KERNEL);
3377 if (!params)
3378 return -ENOMEM;
3379
3380 oparams = memdup_user(_oparams, sizeof(*oparams));
3381 if (IS_ERR(oparams)) {
3382 err = PTR_ERR(oparams);
3383 goto out;
3384 }
3385 snd_pcm_hw_convert_from_old_params(params, oparams);
3386 err = snd_pcm_hw_refine(substream, params);
3387 snd_pcm_hw_convert_to_old_params(oparams, params);
3388 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3389 if (!err)
3390 err = -EFAULT;
3391 }
3392
3393 kfree(oparams);
3394 out:
3395 kfree(params);
3396 return err;
3397 }
3398
3399 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3400 struct snd_pcm_hw_params_old __user * _oparams)
3401 {
3402 struct snd_pcm_hw_params *params;
3403 struct snd_pcm_hw_params_old *oparams = NULL;
3404 int err;
3405
3406 params = kmalloc(sizeof(*params), GFP_KERNEL);
3407 if (!params)
3408 return -ENOMEM;
3409
3410 oparams = memdup_user(_oparams, sizeof(*oparams));
3411 if (IS_ERR(oparams)) {
3412 err = PTR_ERR(oparams);
3413 goto out;
3414 }
3415 snd_pcm_hw_convert_from_old_params(params, oparams);
3416 err = snd_pcm_hw_params(substream, params);
3417 snd_pcm_hw_convert_to_old_params(oparams, params);
3418 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3419 if (!err)
3420 err = -EFAULT;
3421 }
3422
3423 kfree(oparams);
3424 out:
3425 kfree(params);
3426 return err;
3427 }
3428 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3429
3430 #ifndef CONFIG_MMU
3431 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3432 unsigned long addr,
3433 unsigned long len,
3434 unsigned long pgoff,
3435 unsigned long flags)
3436 {
3437 struct snd_pcm_file *pcm_file = file->private_data;
3438 struct snd_pcm_substream *substream = pcm_file->substream;
3439 struct snd_pcm_runtime *runtime = substream->runtime;
3440 unsigned long offset = pgoff << PAGE_SHIFT;
3441
3442 switch (offset) {
3443 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3444 return (unsigned long)runtime->status;
3445 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3446 return (unsigned long)runtime->control;
3447 default:
3448 return (unsigned long)runtime->dma_area + offset;
3449 }
3450 }
3451 #else
3452 # define snd_pcm_get_unmapped_area NULL
3453 #endif
3454
3455 /*
3456 * Register section
3457 */
3458
3459 const struct file_operations snd_pcm_f_ops[2] = {
3460 {
3461 .owner = THIS_MODULE,
3462 .write = snd_pcm_write,
3463 .aio_write = snd_pcm_aio_write,
3464 .open = snd_pcm_playback_open,
3465 .release = snd_pcm_release,
3466 .llseek = no_llseek,
3467 .poll = snd_pcm_playback_poll,
3468 .unlocked_ioctl = snd_pcm_playback_ioctl,
3469 .compat_ioctl = snd_pcm_ioctl_compat,
3470 .mmap = snd_pcm_mmap,
3471 .fasync = snd_pcm_fasync,
3472 .get_unmapped_area = snd_pcm_get_unmapped_area,
3473 },
3474 {
3475 .owner = THIS_MODULE,
3476 .read = snd_pcm_read,
3477 .aio_read = snd_pcm_aio_read,
3478 .open = snd_pcm_capture_open,
3479 .release = snd_pcm_release,
3480 .llseek = no_llseek,
3481 .poll = snd_pcm_capture_poll,
3482 .unlocked_ioctl = snd_pcm_capture_ioctl,
3483 .compat_ioctl = snd_pcm_ioctl_compat,
3484 .mmap = snd_pcm_mmap,
3485 .fasync = snd_pcm_fasync,
3486 .get_unmapped_area = snd_pcm_get_unmapped_area,
3487 }
3488 };
Linux with added FPC-III support