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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / sound / core / pcm_native.c
blob303ac04ff6e427066bf95fe0932361efd7a94ea3
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/mm.h>
23 #include <linux/file.h>
24 #include <linux/slab.h>
25 #include <linux/smp_lock.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos_params.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 char *snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161 };
162 #endif
163
164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166 {
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192 #ifdef RULES_DEBUG
193 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
194 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195 #endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197 #ifdef RULES_DEBUG
198 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199 #endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212 #ifdef RULES_DEBUG
213 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 printk("empty");
216 else
217 printk("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 printk(" -> ");
221 #endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223 #ifdef RULES_DEBUG
224 if (i->empty)
225 printk("empty\n");
226 else
227 printk("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230 #endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257 #ifdef RULES_DEBUG
258 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 printk("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 printk("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 printk("empty");
268 else
269 printk("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274 #endif
275 changed = r->func(params, r);
276 #ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 printk(" -> ");
279 if (hw_is_mask(r->var))
280 printk("%x", *m->bits);
281 else {
282 if (i->empty)
283 printk("empty");
284 else
285 printk("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 printk("\n");
291 #endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333 }
334
335 EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339 {
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355 }
356
357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
358 {
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370 }
371
372 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
373 struct snd_pcm_hw_params *params)
374 {
375 struct snd_pcm_runtime *runtime;
376 int err, usecs;
377 unsigned int bits;
378 snd_pcm_uframes_t frames;
379
380 if (PCM_RUNTIME_CHECK(substream))
381 return -ENXIO;
382 runtime = substream->runtime;
383 snd_pcm_stream_lock_irq(substream);
384 switch (runtime->status->state) {
385 case SNDRV_PCM_STATE_OPEN:
386 case SNDRV_PCM_STATE_SETUP:
387 case SNDRV_PCM_STATE_PREPARED:
388 break;
389 default:
390 snd_pcm_stream_unlock_irq(substream);
391 return -EBADFD;
392 }
393 snd_pcm_stream_unlock_irq(substream);
394 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
395 if (!substream->oss.oss)
396 #endif
397 if (atomic_read(&substream->mmap_count))
398 return -EBADFD;
399
400 params->rmask = ~0U;
401 err = snd_pcm_hw_refine(substream, params);
402 if (err < 0)
403 goto _error;
404
405 err = snd_pcm_hw_params_choose(substream, params);
406 if (err < 0)
407 goto _error;
408
409 if (substream->ops->hw_params != NULL) {
410 err = substream->ops->hw_params(substream, params);
411 if (err < 0)
412 goto _error;
413 }
414
415 runtime->access = params_access(params);
416 runtime->format = params_format(params);
417 runtime->subformat = params_subformat(params);
418 runtime->channels = params_channels(params);
419 runtime->rate = params_rate(params);
420 runtime->period_size = params_period_size(params);
421 runtime->periods = params_periods(params);
422 runtime->buffer_size = params_buffer_size(params);
423 runtime->info = params->info;
424 runtime->rate_num = params->rate_num;
425 runtime->rate_den = params->rate_den;
426
427 bits = snd_pcm_format_physical_width(runtime->format);
428 runtime->sample_bits = bits;
429 bits *= runtime->channels;
430 runtime->frame_bits = bits;
431 frames = 1;
432 while (bits % 8 != 0) {
433 bits *= 2;
434 frames *= 2;
435 }
436 runtime->byte_align = bits / 8;
437 runtime->min_align = frames;
438
439 /* Default sw params */
440 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
441 runtime->period_step = 1;
442 runtime->control->avail_min = runtime->period_size;
443 runtime->start_threshold = 1;
444 runtime->stop_threshold = runtime->buffer_size;
445 runtime->silence_threshold = 0;
446 runtime->silence_size = 0;
447 runtime->boundary = runtime->buffer_size;
448 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
449 runtime->boundary *= 2;
450
451 snd_pcm_timer_resolution_change(substream);
452 runtime->status->state = SNDRV_PCM_STATE_SETUP;
453
454 if (substream->latency_pm_qos_req) {
455 pm_qos_remove_request(substream->latency_pm_qos_req);
456 substream->latency_pm_qos_req = NULL;
457 }
458 if ((usecs = period_to_usecs(runtime)) >= 0)
459 substream->latency_pm_qos_req = pm_qos_add_request(
460 PM_QOS_CPU_DMA_LATENCY, usecs);
461 return 0;
462 _error:
463 /* hardware might be unuseable from this time,
464 so we force application to retry to set
465 the correct hardware parameter settings */
466 runtime->status->state = SNDRV_PCM_STATE_OPEN;
467 if (substream->ops->hw_free != NULL)
468 substream->ops->hw_free(substream);
469 return err;
470 }
471
472 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
473 struct snd_pcm_hw_params __user * _params)
474 {
475 struct snd_pcm_hw_params *params;
476 int err;
477
478 params = memdup_user(_params, sizeof(*params));
479 if (IS_ERR(params))
480 return PTR_ERR(params);
481
482 err = snd_pcm_hw_params(substream, params);
483 if (copy_to_user(_params, params, sizeof(*params))) {
484 if (!err)
485 err = -EFAULT;
486 }
487
488 kfree(params);
489 return err;
490 }
491
492 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
493 {
494 struct snd_pcm_runtime *runtime;
495 int result = 0;
496
497 if (PCM_RUNTIME_CHECK(substream))
498 return -ENXIO;
499 runtime = substream->runtime;
500 snd_pcm_stream_lock_irq(substream);
501 switch (runtime->status->state) {
502 case SNDRV_PCM_STATE_SETUP:
503 case SNDRV_PCM_STATE_PREPARED:
504 break;
505 default:
506 snd_pcm_stream_unlock_irq(substream);
507 return -EBADFD;
508 }
509 snd_pcm_stream_unlock_irq(substream);
510 if (atomic_read(&substream->mmap_count))
511 return -EBADFD;
512 if (substream->ops->hw_free)
513 result = substream->ops->hw_free(substream);
514 runtime->status->state = SNDRV_PCM_STATE_OPEN;
515 pm_qos_remove_request(substream->latency_pm_qos_req);
516 substream->latency_pm_qos_req = NULL;
517 return result;
518 }
519
520 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
521 struct snd_pcm_sw_params *params)
522 {
523 struct snd_pcm_runtime *runtime;
524 int err;
525
526 if (PCM_RUNTIME_CHECK(substream))
527 return -ENXIO;
528 runtime = substream->runtime;
529 snd_pcm_stream_lock_irq(substream);
530 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
531 snd_pcm_stream_unlock_irq(substream);
532 return -EBADFD;
533 }
534 snd_pcm_stream_unlock_irq(substream);
535
536 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
537 return -EINVAL;
538 if (params->avail_min == 0)
539 return -EINVAL;
540 if (params->silence_size >= runtime->boundary) {
541 if (params->silence_threshold != 0)
542 return -EINVAL;
543 } else {
544 if (params->silence_size > params->silence_threshold)
545 return -EINVAL;
546 if (params->silence_threshold > runtime->buffer_size)
547 return -EINVAL;
548 }
549 err = 0;
550 snd_pcm_stream_lock_irq(substream);
551 runtime->tstamp_mode = params->tstamp_mode;
552 runtime->period_step = params->period_step;
553 runtime->control->avail_min = params->avail_min;
554 runtime->start_threshold = params->start_threshold;
555 runtime->stop_threshold = params->stop_threshold;
556 runtime->silence_threshold = params->silence_threshold;
557 runtime->silence_size = params->silence_size;
558 params->boundary = runtime->boundary;
559 if (snd_pcm_running(substream)) {
560 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
561 runtime->silence_size > 0)
562 snd_pcm_playback_silence(substream, ULONG_MAX);
563 err = snd_pcm_update_state(substream, runtime);
564 }
565 snd_pcm_stream_unlock_irq(substream);
566 return err;
567 }
568
569 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
570 struct snd_pcm_sw_params __user * _params)
571 {
572 struct snd_pcm_sw_params params;
573 int err;
574 if (copy_from_user(&params, _params, sizeof(params)))
575 return -EFAULT;
576 err = snd_pcm_sw_params(substream, &params);
577 if (copy_to_user(_params, &params, sizeof(params)))
578 return -EFAULT;
579 return err;
580 }
581
582 int snd_pcm_status(struct snd_pcm_substream *substream,
583 struct snd_pcm_status *status)
584 {
585 struct snd_pcm_runtime *runtime = substream->runtime;
586
587 snd_pcm_stream_lock_irq(substream);
588 status->state = runtime->status->state;
589 status->suspended_state = runtime->status->suspended_state;
590 if (status->state == SNDRV_PCM_STATE_OPEN)
591 goto _end;
592 status->trigger_tstamp = runtime->trigger_tstamp;
593 if (snd_pcm_running(substream)) {
594 snd_pcm_update_hw_ptr(substream);
595 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
596 status->tstamp = runtime->status->tstamp;
597 goto _tstamp_end;
598 }
599 }
600 snd_pcm_gettime(runtime, &status->tstamp);
601 _tstamp_end:
602 status->appl_ptr = runtime->control->appl_ptr;
603 status->hw_ptr = runtime->status->hw_ptr;
604 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
605 status->avail = snd_pcm_playback_avail(runtime);
606 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
607 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
608 status->delay = runtime->buffer_size - status->avail;
609 status->delay += runtime->delay;
610 } else
611 status->delay = 0;
612 } else {
613 status->avail = snd_pcm_capture_avail(runtime);
614 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
615 status->delay = status->avail + runtime->delay;
616 else
617 status->delay = 0;
618 }
619 status->avail_max = runtime->avail_max;
620 status->overrange = runtime->overrange;
621 runtime->avail_max = 0;
622 runtime->overrange = 0;
623 _end:
624 snd_pcm_stream_unlock_irq(substream);
625 return 0;
626 }
627
628 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
629 struct snd_pcm_status __user * _status)
630 {
631 struct snd_pcm_status status;
632 int res;
633
634 memset(&status, 0, sizeof(status));
635 res = snd_pcm_status(substream, &status);
636 if (res < 0)
637 return res;
638 if (copy_to_user(_status, &status, sizeof(status)))
639 return -EFAULT;
640 return 0;
641 }
642
643 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
644 struct snd_pcm_channel_info * info)
645 {
646 struct snd_pcm_runtime *runtime;
647 unsigned int channel;
648
649 channel = info->channel;
650 runtime = substream->runtime;
651 snd_pcm_stream_lock_irq(substream);
652 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
653 snd_pcm_stream_unlock_irq(substream);
654 return -EBADFD;
655 }
656 snd_pcm_stream_unlock_irq(substream);
657 if (channel >= runtime->channels)
658 return -EINVAL;
659 memset(info, 0, sizeof(*info));
660 info->channel = channel;
661 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
662 }
663
664 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
665 struct snd_pcm_channel_info __user * _info)
666 {
667 struct snd_pcm_channel_info info;
668 int res;
669
670 if (copy_from_user(&info, _info, sizeof(info)))
671 return -EFAULT;
672 res = snd_pcm_channel_info(substream, &info);
673 if (res < 0)
674 return res;
675 if (copy_to_user(_info, &info, sizeof(info)))
676 return -EFAULT;
677 return 0;
678 }
679
680 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
681 {
682 struct snd_pcm_runtime *runtime = substream->runtime;
683 if (runtime->trigger_master == NULL)
684 return;
685 if (runtime->trigger_master == substream) {
686 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
687 } else {
688 snd_pcm_trigger_tstamp(runtime->trigger_master);
689 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
690 }
691 runtime->trigger_master = NULL;
692 }
693
694 struct action_ops {
695 int (*pre_action)(struct snd_pcm_substream *substream, int state);
696 int (*do_action)(struct snd_pcm_substream *substream, int state);
697 void (*undo_action)(struct snd_pcm_substream *substream, int state);
698 void (*post_action)(struct snd_pcm_substream *substream, int state);
699 };
700
701 /*
702 * this functions is core for handling of linked stream
703 * Note: the stream state might be changed also on failure
704 * Note2: call with calling stream lock + link lock
705 */
706 static int snd_pcm_action_group(struct action_ops *ops,
707 struct snd_pcm_substream *substream,
708 int state, int do_lock)
709 {
710 struct snd_pcm_substream *s = NULL;
711 struct snd_pcm_substream *s1;
712 int res = 0;
713
714 snd_pcm_group_for_each_entry(s, substream) {
715 if (do_lock && s != substream)
716 spin_lock_nested(&s->self_group.lock,
717 SINGLE_DEPTH_NESTING);
718 res = ops->pre_action(s, state);
719 if (res < 0)
720 goto _unlock;
721 }
722 snd_pcm_group_for_each_entry(s, substream) {
723 res = ops->do_action(s, state);
724 if (res < 0) {
725 if (ops->undo_action) {
726 snd_pcm_group_for_each_entry(s1, substream) {
727 if (s1 == s) /* failed stream */
728 break;
729 ops->undo_action(s1, state);
730 }
731 }
732 s = NULL; /* unlock all */
733 goto _unlock;
734 }
735 }
736 snd_pcm_group_for_each_entry(s, substream) {
737 ops->post_action(s, state);
738 }
739 _unlock:
740 if (do_lock) {
741 /* unlock streams */
742 snd_pcm_group_for_each_entry(s1, substream) {
743 if (s1 != substream)
744 spin_unlock(&s1->self_group.lock);
745 if (s1 == s) /* end */
746 break;
747 }
748 }
749 return res;
750 }
751
752 /*
753 * Note: call with stream lock
754 */
755 static int snd_pcm_action_single(struct action_ops *ops,
756 struct snd_pcm_substream *substream,
757 int state)
758 {
759 int res;
760
761 res = ops->pre_action(substream, state);
762 if (res < 0)
763 return res;
764 res = ops->do_action(substream, state);
765 if (res == 0)
766 ops->post_action(substream, state);
767 else if (ops->undo_action)
768 ops->undo_action(substream, state);
769 return res;
770 }
771
772 /*
773 * Note: call with stream lock
774 */
775 static int snd_pcm_action(struct action_ops *ops,
776 struct snd_pcm_substream *substream,
777 int state)
778 {
779 int res;
780
781 if (snd_pcm_stream_linked(substream)) {
782 if (!spin_trylock(&substream->group->lock)) {
783 spin_unlock(&substream->self_group.lock);
784 spin_lock(&substream->group->lock);
785 spin_lock(&substream->self_group.lock);
786 }
787 res = snd_pcm_action_group(ops, substream, state, 1);
788 spin_unlock(&substream->group->lock);
789 } else {
790 res = snd_pcm_action_single(ops, substream, state);
791 }
792 return res;
793 }
794
795 /*
796 * Note: don't use any locks before
797 */
798 static int snd_pcm_action_lock_irq(struct action_ops *ops,
799 struct snd_pcm_substream *substream,
800 int state)
801 {
802 int res;
803
804 read_lock_irq(&snd_pcm_link_rwlock);
805 if (snd_pcm_stream_linked(substream)) {
806 spin_lock(&substream->group->lock);
807 spin_lock(&substream->self_group.lock);
808 res = snd_pcm_action_group(ops, substream, state, 1);
809 spin_unlock(&substream->self_group.lock);
810 spin_unlock(&substream->group->lock);
811 } else {
812 spin_lock(&substream->self_group.lock);
813 res = snd_pcm_action_single(ops, substream, state);
814 spin_unlock(&substream->self_group.lock);
815 }
816 read_unlock_irq(&snd_pcm_link_rwlock);
817 return res;
818 }
819
820 /*
821 */
822 static int snd_pcm_action_nonatomic(struct action_ops *ops,
823 struct snd_pcm_substream *substream,
824 int state)
825 {
826 int res;
827
828 down_read(&snd_pcm_link_rwsem);
829 if (snd_pcm_stream_linked(substream))
830 res = snd_pcm_action_group(ops, substream, state, 0);
831 else
832 res = snd_pcm_action_single(ops, substream, state);
833 up_read(&snd_pcm_link_rwsem);
834 return res;
835 }
836
837 /*
838 * start callbacks
839 */
840 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
841 {
842 struct snd_pcm_runtime *runtime = substream->runtime;
843 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
844 return -EBADFD;
845 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
846 !snd_pcm_playback_data(substream))
847 return -EPIPE;
848 runtime->trigger_master = substream;
849 return 0;
850 }
851
852 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
853 {
854 if (substream->runtime->trigger_master != substream)
855 return 0;
856 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
857 }
858
859 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
860 {
861 if (substream->runtime->trigger_master == substream)
862 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
863 }
864
865 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
866 {
867 struct snd_pcm_runtime *runtime = substream->runtime;
868 snd_pcm_trigger_tstamp(substream);
869 runtime->hw_ptr_jiffies = jiffies;
870 runtime->status->state = state;
871 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
872 runtime->silence_size > 0)
873 snd_pcm_playback_silence(substream, ULONG_MAX);
874 if (substream->timer)
875 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
876 &runtime->trigger_tstamp);
877 }
878
879 static struct action_ops snd_pcm_action_start = {
880 .pre_action = snd_pcm_pre_start,
881 .do_action = snd_pcm_do_start,
882 .undo_action = snd_pcm_undo_start,
883 .post_action = snd_pcm_post_start
884 };
885
886 /**
887 * snd_pcm_start - start all linked streams
888 * @substream: the PCM substream instance
889 */
890 int snd_pcm_start(struct snd_pcm_substream *substream)
891 {
892 return snd_pcm_action(&snd_pcm_action_start, substream,
893 SNDRV_PCM_STATE_RUNNING);
894 }
895
896 /*
897 * stop callbacks
898 */
899 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
900 {
901 struct snd_pcm_runtime *runtime = substream->runtime;
902 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
903 return -EBADFD;
904 runtime->trigger_master = substream;
905 return 0;
906 }
907
908 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
909 {
910 if (substream->runtime->trigger_master == substream &&
911 snd_pcm_running(substream))
912 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
913 return 0; /* unconditonally stop all substreams */
914 }
915
916 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
917 {
918 struct snd_pcm_runtime *runtime = substream->runtime;
919 if (runtime->status->state != state) {
920 snd_pcm_trigger_tstamp(substream);
921 if (substream->timer)
922 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
923 &runtime->trigger_tstamp);
924 runtime->status->state = state;
925 }
926 wake_up(&runtime->sleep);
927 wake_up(&runtime->tsleep);
928 }
929
930 static struct action_ops snd_pcm_action_stop = {
931 .pre_action = snd_pcm_pre_stop,
932 .do_action = snd_pcm_do_stop,
933 .post_action = snd_pcm_post_stop
934 };
935
936 /**
937 * snd_pcm_stop - try to stop all running streams in the substream group
938 * @substream: the PCM substream instance
939 * @state: PCM state after stopping the stream
940 *
941 * The state of each stream is then changed to the given state unconditionally.
942 */
943 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
944 {
945 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
946 }
947
948 EXPORT_SYMBOL(snd_pcm_stop);
949
950 /**
951 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
952 * @substream: the PCM substream
953 *
954 * After stopping, the state is changed to SETUP.
955 * Unlike snd_pcm_stop(), this affects only the given stream.
956 */
957 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
958 {
959 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
960 SNDRV_PCM_STATE_SETUP);
961 }
962
963 /*
964 * pause callbacks
965 */
966 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
967 {
968 struct snd_pcm_runtime *runtime = substream->runtime;
969 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
970 return -ENOSYS;
971 if (push) {
972 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
973 return -EBADFD;
974 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
975 return -EBADFD;
976 runtime->trigger_master = substream;
977 return 0;
978 }
979
980 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
981 {
982 if (substream->runtime->trigger_master != substream)
983 return 0;
984 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
985 * a delta betwen the current jiffies, this gives a large enough
986 * delta, effectively to skip the check once.
987 */
988 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
989 return substream->ops->trigger(substream,
990 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
991 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
992 }
993
994 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
995 {
996 if (substream->runtime->trigger_master == substream)
997 substream->ops->trigger(substream,
998 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
999 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1000 }
1001
1002 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1003 {
1004 struct snd_pcm_runtime *runtime = substream->runtime;
1005 snd_pcm_trigger_tstamp(substream);
1006 if (push) {
1007 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1008 if (substream->timer)
1009 snd_timer_notify(substream->timer,
1010 SNDRV_TIMER_EVENT_MPAUSE,
1011 &runtime->trigger_tstamp);
1012 wake_up(&runtime->sleep);
1013 wake_up(&runtime->tsleep);
1014 } else {
1015 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1016 if (substream->timer)
1017 snd_timer_notify(substream->timer,
1018 SNDRV_TIMER_EVENT_MCONTINUE,
1019 &runtime->trigger_tstamp);
1020 }
1021 }
1022
1023 static struct action_ops snd_pcm_action_pause = {
1024 .pre_action = snd_pcm_pre_pause,
1025 .do_action = snd_pcm_do_pause,
1026 .undo_action = snd_pcm_undo_pause,
1027 .post_action = snd_pcm_post_pause
1028 };
1029
1030 /*
1031 * Push/release the pause for all linked streams.
1032 */
1033 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1034 {
1035 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1036 }
1037
1038 #ifdef CONFIG_PM
1039 /* suspend */
1040
1041 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1042 {
1043 struct snd_pcm_runtime *runtime = substream->runtime;
1044 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1045 return -EBUSY;
1046 runtime->trigger_master = substream;
1047 return 0;
1048 }
1049
1050 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1051 {
1052 struct snd_pcm_runtime *runtime = substream->runtime;
1053 if (runtime->trigger_master != substream)
1054 return 0;
1055 if (! snd_pcm_running(substream))
1056 return 0;
1057 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1058 return 0; /* suspend unconditionally */
1059 }
1060
1061 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1062 {
1063 struct snd_pcm_runtime *runtime = substream->runtime;
1064 snd_pcm_trigger_tstamp(substream);
1065 if (substream->timer)
1066 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1067 &runtime->trigger_tstamp);
1068 runtime->status->suspended_state = runtime->status->state;
1069 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1070 wake_up(&runtime->sleep);
1071 wake_up(&runtime->tsleep);
1072 }
1073
1074 static struct action_ops snd_pcm_action_suspend = {
1075 .pre_action = snd_pcm_pre_suspend,
1076 .do_action = snd_pcm_do_suspend,
1077 .post_action = snd_pcm_post_suspend
1078 };
1079
1080 /**
1081 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1082 * @substream: the PCM substream
1083 *
1084 * After this call, all streams are changed to SUSPENDED state.
1085 */
1086 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1087 {
1088 int err;
1089 unsigned long flags;
1090
1091 if (! substream)
1092 return 0;
1093
1094 snd_pcm_stream_lock_irqsave(substream, flags);
1095 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1096 snd_pcm_stream_unlock_irqrestore(substream, flags);
1097 return err;
1098 }
1099
1100 EXPORT_SYMBOL(snd_pcm_suspend);
1101
1102 /**
1103 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1104 * @pcm: the PCM instance
1105 *
1106 * After this call, all streams are changed to SUSPENDED state.
1107 */
1108 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1109 {
1110 struct snd_pcm_substream *substream;
1111 int stream, err = 0;
1112
1113 if (! pcm)
1114 return 0;
1115
1116 for (stream = 0; stream < 2; stream++) {
1117 for (substream = pcm->streams[stream].substream;
1118 substream; substream = substream->next) {
1119 /* FIXME: the open/close code should lock this as well */
1120 if (substream->runtime == NULL)
1121 continue;
1122 err = snd_pcm_suspend(substream);
1123 if (err < 0 && err != -EBUSY)
1124 return err;
1125 }
1126 }
1127 return 0;
1128 }
1129
1130 EXPORT_SYMBOL(snd_pcm_suspend_all);
1131
1132 /* resume */
1133
1134 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1135 {
1136 struct snd_pcm_runtime *runtime = substream->runtime;
1137 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1138 return -ENOSYS;
1139 runtime->trigger_master = substream;
1140 return 0;
1141 }
1142
1143 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1144 {
1145 struct snd_pcm_runtime *runtime = substream->runtime;
1146 if (runtime->trigger_master != substream)
1147 return 0;
1148 /* DMA not running previously? */
1149 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1150 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1151 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1152 return 0;
1153 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1154 }
1155
1156 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1157 {
1158 if (substream->runtime->trigger_master == substream &&
1159 snd_pcm_running(substream))
1160 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1161 }
1162
1163 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1164 {
1165 struct snd_pcm_runtime *runtime = substream->runtime;
1166 snd_pcm_trigger_tstamp(substream);
1167 if (substream->timer)
1168 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1169 &runtime->trigger_tstamp);
1170 runtime->status->state = runtime->status->suspended_state;
1171 }
1172
1173 static struct action_ops snd_pcm_action_resume = {
1174 .pre_action = snd_pcm_pre_resume,
1175 .do_action = snd_pcm_do_resume,
1176 .undo_action = snd_pcm_undo_resume,
1177 .post_action = snd_pcm_post_resume
1178 };
1179
1180 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1181 {
1182 struct snd_card *card = substream->pcm->card;
1183 int res;
1184
1185 snd_power_lock(card);
1186 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1187 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1188 snd_power_unlock(card);
1189 return res;
1190 }
1191
1192 #else
1193
1194 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1195 {
1196 return -ENOSYS;
1197 }
1198
1199 #endif /* CONFIG_PM */
1200
1201 /*
1202 * xrun ioctl
1203 *
1204 * Change the RUNNING stream(s) to XRUN state.
1205 */
1206 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1207 {
1208 struct snd_card *card = substream->pcm->card;
1209 struct snd_pcm_runtime *runtime = substream->runtime;
1210 int result;
1211
1212 snd_power_lock(card);
1213 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1214 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1215 if (result < 0)
1216 goto _unlock;
1217 }
1218
1219 snd_pcm_stream_lock_irq(substream);
1220 switch (runtime->status->state) {
1221 case SNDRV_PCM_STATE_XRUN:
1222 result = 0; /* already there */
1223 break;
1224 case SNDRV_PCM_STATE_RUNNING:
1225 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1226 break;
1227 default:
1228 result = -EBADFD;
1229 }
1230 snd_pcm_stream_unlock_irq(substream);
1231 _unlock:
1232 snd_power_unlock(card);
1233 return result;
1234 }
1235
1236 /*
1237 * reset ioctl
1238 */
1239 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1240 {
1241 struct snd_pcm_runtime *runtime = substream->runtime;
1242 switch (runtime->status->state) {
1243 case SNDRV_PCM_STATE_RUNNING:
1244 case SNDRV_PCM_STATE_PREPARED:
1245 case SNDRV_PCM_STATE_PAUSED:
1246 case SNDRV_PCM_STATE_SUSPENDED:
1247 return 0;
1248 default:
1249 return -EBADFD;
1250 }
1251 }
1252
1253 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1254 {
1255 struct snd_pcm_runtime *runtime = substream->runtime;
1256 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1257 if (err < 0)
1258 return err;
1259 runtime->hw_ptr_base = 0;
1260 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1261 runtime->status->hw_ptr % runtime->period_size;
1262 runtime->silence_start = runtime->status->hw_ptr;
1263 runtime->silence_filled = 0;
1264 return 0;
1265 }
1266
1267 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1268 {
1269 struct snd_pcm_runtime *runtime = substream->runtime;
1270 runtime->control->appl_ptr = runtime->status->hw_ptr;
1271 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1272 runtime->silence_size > 0)
1273 snd_pcm_playback_silence(substream, ULONG_MAX);
1274 }
1275
1276 static struct action_ops snd_pcm_action_reset = {
1277 .pre_action = snd_pcm_pre_reset,
1278 .do_action = snd_pcm_do_reset,
1279 .post_action = snd_pcm_post_reset
1280 };
1281
1282 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1283 {
1284 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1285 }
1286
1287 /*
1288 * prepare ioctl
1289 */
1290 /* we use the second argument for updating f_flags */
1291 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1292 int f_flags)
1293 {
1294 struct snd_pcm_runtime *runtime = substream->runtime;
1295 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1296 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1297 return -EBADFD;
1298 if (snd_pcm_running(substream))
1299 return -EBUSY;
1300 substream->f_flags = f_flags;
1301 return 0;
1302 }
1303
1304 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1305 {
1306 int err;
1307 err = substream->ops->prepare(substream);
1308 if (err < 0)
1309 return err;
1310 return snd_pcm_do_reset(substream, 0);
1311 }
1312
1313 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1314 {
1315 struct snd_pcm_runtime *runtime = substream->runtime;
1316 runtime->control->appl_ptr = runtime->status->hw_ptr;
1317 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1318 }
1319
1320 static struct action_ops snd_pcm_action_prepare = {
1321 .pre_action = snd_pcm_pre_prepare,
1322 .do_action = snd_pcm_do_prepare,
1323 .post_action = snd_pcm_post_prepare
1324 };
1325
1326 /**
1327 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1328 * @substream: the PCM substream instance
1329 * @file: file to refer f_flags
1330 */
1331 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1332 struct file *file)
1333 {
1334 int res;
1335 struct snd_card *card = substream->pcm->card;
1336 int f_flags;
1337
1338 if (file)
1339 f_flags = file->f_flags;
1340 else
1341 f_flags = substream->f_flags;
1342
1343 snd_power_lock(card);
1344 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1345 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1346 substream, f_flags);
1347 snd_power_unlock(card);
1348 return res;
1349 }
1350
1351 /*
1352 * drain ioctl
1353 */
1354
1355 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1356 {
1357 substream->runtime->trigger_master = substream;
1358 return 0;
1359 }
1360
1361 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1362 {
1363 struct snd_pcm_runtime *runtime = substream->runtime;
1364 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1365 switch (runtime->status->state) {
1366 case SNDRV_PCM_STATE_PREPARED:
1367 /* start playback stream if possible */
1368 if (! snd_pcm_playback_empty(substream)) {
1369 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1370 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1371 }
1372 break;
1373 case SNDRV_PCM_STATE_RUNNING:
1374 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1375 break;
1376 default:
1377 break;
1378 }
1379 } else {
1380 /* stop running stream */
1381 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1382 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1383 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1384 snd_pcm_do_stop(substream, new_state);
1385 snd_pcm_post_stop(substream, new_state);
1386 }
1387 }
1388 return 0;
1389 }
1390
1391 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1392 {
1393 }
1394
1395 static struct action_ops snd_pcm_action_drain_init = {
1396 .pre_action = snd_pcm_pre_drain_init,
1397 .do_action = snd_pcm_do_drain_init,
1398 .post_action = snd_pcm_post_drain_init
1399 };
1400
1401 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1402
1403 /*
1404 * Drain the stream(s).
1405 * When the substream is linked, sync until the draining of all playback streams
1406 * is finished.
1407 * After this call, all streams are supposed to be either SETUP or DRAINING
1408 * (capture only) state.
1409 */
1410 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1411 struct file *file)
1412 {
1413 struct snd_card *card;
1414 struct snd_pcm_runtime *runtime;
1415 struct snd_pcm_substream *s;
1416 wait_queue_t wait;
1417 int result = 0;
1418 int nonblock = 0;
1419
1420 card = substream->pcm->card;
1421 runtime = substream->runtime;
1422
1423 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1424 return -EBADFD;
1425
1426 snd_power_lock(card);
1427 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1428 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1429 if (result < 0) {
1430 snd_power_unlock(card);
1431 return result;
1432 }
1433 }
1434
1435 if (file) {
1436 if (file->f_flags & O_NONBLOCK)
1437 nonblock = 1;
1438 } else if (substream->f_flags & O_NONBLOCK)
1439 nonblock = 1;
1440
1441 down_read(&snd_pcm_link_rwsem);
1442 snd_pcm_stream_lock_irq(substream);
1443 /* resume pause */
1444 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1445 snd_pcm_pause(substream, 0);
1446
1447 /* pre-start/stop - all running streams are changed to DRAINING state */
1448 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1449 if (result < 0)
1450 goto unlock;
1451 /* in non-blocking, we don't wait in ioctl but let caller poll */
1452 if (nonblock) {
1453 result = -EAGAIN;
1454 goto unlock;
1455 }
1456
1457 for (;;) {
1458 long tout;
1459 struct snd_pcm_runtime *to_check;
1460 if (signal_pending(current)) {
1461 result = -ERESTARTSYS;
1462 break;
1463 }
1464 /* find a substream to drain */
1465 to_check = NULL;
1466 snd_pcm_group_for_each_entry(s, substream) {
1467 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1468 continue;
1469 runtime = s->runtime;
1470 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1471 to_check = runtime;
1472 break;
1473 }
1474 }
1475 if (!to_check)
1476 break; /* all drained */
1477 init_waitqueue_entry(&wait, current);
1478 add_wait_queue(&to_check->sleep, &wait);
1479 set_current_state(TASK_INTERRUPTIBLE);
1480 snd_pcm_stream_unlock_irq(substream);
1481 up_read(&snd_pcm_link_rwsem);
1482 snd_power_unlock(card);
1483 tout = schedule_timeout(10 * HZ);
1484 snd_power_lock(card);
1485 down_read(&snd_pcm_link_rwsem);
1486 snd_pcm_stream_lock_irq(substream);
1487 remove_wait_queue(&to_check->sleep, &wait);
1488 if (tout == 0) {
1489 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1490 result = -ESTRPIPE;
1491 else {
1492 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1493 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1494 result = -EIO;
1495 }
1496 break;
1497 }
1498 }
1499
1500 unlock:
1501 snd_pcm_stream_unlock_irq(substream);
1502 up_read(&snd_pcm_link_rwsem);
1503 snd_power_unlock(card);
1504
1505 return result;
1506 }
1507
1508 /*
1509 * drop ioctl
1510 *
1511 * Immediately put all linked substreams into SETUP state.
1512 */
1513 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1514 {
1515 struct snd_pcm_runtime *runtime;
1516 struct snd_card *card;
1517 int result = 0;
1518
1519 if (PCM_RUNTIME_CHECK(substream))
1520 return -ENXIO;
1521 runtime = substream->runtime;
1522 card = substream->pcm->card;
1523
1524 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1525 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1526 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1527 return -EBADFD;
1528
1529 snd_pcm_stream_lock_irq(substream);
1530 /* resume pause */
1531 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1532 snd_pcm_pause(substream, 0);
1533
1534 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1535 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1536 snd_pcm_stream_unlock_irq(substream);
1537
1538 return result;
1539 }
1540
1541
1542 /* WARNING: Don't forget to fput back the file */
1543 static struct file *snd_pcm_file_fd(int fd)
1544 {
1545 struct file *file;
1546 struct inode *inode;
1547 unsigned int minor;
1548
1549 file = fget(fd);
1550 if (!file)
1551 return NULL;
1552 inode = file->f_path.dentry->d_inode;
1553 if (!S_ISCHR(inode->i_mode) ||
1554 imajor(inode) != snd_major) {
1555 fput(file);
1556 return NULL;
1557 }
1558 minor = iminor(inode);
1559 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1560 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1561 fput(file);
1562 return NULL;
1563 }
1564 return file;
1565 }
1566
1567 /*
1568 * PCM link handling
1569 */
1570 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1571 {
1572 int res = 0;
1573 struct file *file;
1574 struct snd_pcm_file *pcm_file;
1575 struct snd_pcm_substream *substream1;
1576
1577 file = snd_pcm_file_fd(fd);
1578 if (!file)
1579 return -EBADFD;
1580 pcm_file = file->private_data;
1581 substream1 = pcm_file->substream;
1582 down_write(&snd_pcm_link_rwsem);
1583 write_lock_irq(&snd_pcm_link_rwlock);
1584 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1585 substream->runtime->status->state != substream1->runtime->status->state) {
1586 res = -EBADFD;
1587 goto _end;
1588 }
1589 if (snd_pcm_stream_linked(substream1)) {
1590 res = -EALREADY;
1591 goto _end;
1592 }
1593 if (!snd_pcm_stream_linked(substream)) {
1594 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1595 if (substream->group == NULL) {
1596 res = -ENOMEM;
1597 goto _end;
1598 }
1599 spin_lock_init(&substream->group->lock);
1600 INIT_LIST_HEAD(&substream->group->substreams);
1601 list_add_tail(&substream->link_list, &substream->group->substreams);
1602 substream->group->count = 1;
1603 }
1604 list_add_tail(&substream1->link_list, &substream->group->substreams);
1605 substream->group->count++;
1606 substream1->group = substream->group;
1607 _end:
1608 write_unlock_irq(&snd_pcm_link_rwlock);
1609 up_write(&snd_pcm_link_rwsem);
1610 fput(file);
1611 return res;
1612 }
1613
1614 static void relink_to_local(struct snd_pcm_substream *substream)
1615 {
1616 substream->group = &substream->self_group;
1617 INIT_LIST_HEAD(&substream->self_group.substreams);
1618 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1619 }
1620
1621 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1622 {
1623 struct snd_pcm_substream *s;
1624 int res = 0;
1625
1626 down_write(&snd_pcm_link_rwsem);
1627 write_lock_irq(&snd_pcm_link_rwlock);
1628 if (!snd_pcm_stream_linked(substream)) {
1629 res = -EALREADY;
1630 goto _end;
1631 }
1632 list_del(&substream->link_list);
1633 substream->group->count--;
1634 if (substream->group->count == 1) { /* detach the last stream, too */
1635 snd_pcm_group_for_each_entry(s, substream) {
1636 relink_to_local(s);
1637 break;
1638 }
1639 kfree(substream->group);
1640 }
1641 relink_to_local(substream);
1642 _end:
1643 write_unlock_irq(&snd_pcm_link_rwlock);
1644 up_write(&snd_pcm_link_rwsem);
1645 return res;
1646 }
1647
1648 /*
1649 * hw configurator
1650 */
1651 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1652 struct snd_pcm_hw_rule *rule)
1653 {
1654 struct snd_interval t;
1655 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1656 hw_param_interval_c(params, rule->deps[1]), &t);
1657 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1658 }
1659
1660 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1661 struct snd_pcm_hw_rule *rule)
1662 {
1663 struct snd_interval t;
1664 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1665 hw_param_interval_c(params, rule->deps[1]), &t);
1666 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1667 }
1668
1669 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1670 struct snd_pcm_hw_rule *rule)
1671 {
1672 struct snd_interval t;
1673 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1674 hw_param_interval_c(params, rule->deps[1]),
1675 (unsigned long) rule->private, &t);
1676 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1677 }
1678
1679 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1680 struct snd_pcm_hw_rule *rule)
1681 {
1682 struct snd_interval t;
1683 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1684 (unsigned long) rule->private,
1685 hw_param_interval_c(params, rule->deps[1]), &t);
1686 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1687 }
1688
1689 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1690 struct snd_pcm_hw_rule *rule)
1691 {
1692 unsigned int k;
1693 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1694 struct snd_mask m;
1695 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1696 snd_mask_any(&m);
1697 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1698 int bits;
1699 if (! snd_mask_test(mask, k))
1700 continue;
1701 bits = snd_pcm_format_physical_width(k);
1702 if (bits <= 0)
1703 continue; /* ignore invalid formats */
1704 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1705 snd_mask_reset(&m, k);
1706 }
1707 return snd_mask_refine(mask, &m);
1708 }
1709
1710 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1711 struct snd_pcm_hw_rule *rule)
1712 {
1713 struct snd_interval t;
1714 unsigned int k;
1715 t.min = UINT_MAX;
1716 t.max = 0;
1717 t.openmin = 0;
1718 t.openmax = 0;
1719 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1720 int bits;
1721 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1722 continue;
1723 bits = snd_pcm_format_physical_width(k);
1724 if (bits <= 0)
1725 continue; /* ignore invalid formats */
1726 if (t.min > (unsigned)bits)
1727 t.min = bits;
1728 if (t.max < (unsigned)bits)
1729 t.max = bits;
1730 }
1731 t.integer = 1;
1732 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1733 }
1734
1735 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1736 #error "Change this table"
1737 #endif
1738
1739 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1740 48000, 64000, 88200, 96000, 176400, 192000 };
1741
1742 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1743 .count = ARRAY_SIZE(rates),
1744 .list = rates,
1745 };
1746
1747 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1748 struct snd_pcm_hw_rule *rule)
1749 {
1750 struct snd_pcm_hardware *hw = rule->private;
1751 return snd_interval_list(hw_param_interval(params, rule->var),
1752 snd_pcm_known_rates.count,
1753 snd_pcm_known_rates.list, hw->rates);
1754 }
1755
1756 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1757 struct snd_pcm_hw_rule *rule)
1758 {
1759 struct snd_interval t;
1760 struct snd_pcm_substream *substream = rule->private;
1761 t.min = 0;
1762 t.max = substream->buffer_bytes_max;
1763 t.openmin = 0;
1764 t.openmax = 0;
1765 t.integer = 1;
1766 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1767 }
1768
1769 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1770 {
1771 struct snd_pcm_runtime *runtime = substream->runtime;
1772 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1773 int k, err;
1774
1775 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1776 snd_mask_any(constrs_mask(constrs, k));
1777 }
1778
1779 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1780 snd_interval_any(constrs_interval(constrs, k));
1781 }
1782
1783 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1784 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1785 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1786 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1787 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1788
1789 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1790 snd_pcm_hw_rule_format, NULL,
1791 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1792 if (err < 0)
1793 return err;
1794 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1795 snd_pcm_hw_rule_sample_bits, NULL,
1796 SNDRV_PCM_HW_PARAM_FORMAT,
1797 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1798 if (err < 0)
1799 return err;
1800 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1801 snd_pcm_hw_rule_div, NULL,
1802 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1803 if (err < 0)
1804 return err;
1805 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1806 snd_pcm_hw_rule_mul, NULL,
1807 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1808 if (err < 0)
1809 return err;
1810 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1811 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1812 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1813 if (err < 0)
1814 return err;
1815 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1816 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1817 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1818 if (err < 0)
1819 return err;
1820 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1821 snd_pcm_hw_rule_div, NULL,
1822 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1823 if (err < 0)
1824 return err;
1825 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1826 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1827 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1828 if (err < 0)
1829 return err;
1830 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1831 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1832 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1833 if (err < 0)
1834 return err;
1835 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1836 snd_pcm_hw_rule_div, NULL,
1837 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1838 if (err < 0)
1839 return err;
1840 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1841 snd_pcm_hw_rule_div, NULL,
1842 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1843 if (err < 0)
1844 return err;
1845 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1846 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1847 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1848 if (err < 0)
1849 return err;
1850 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1851 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1852 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1853 if (err < 0)
1854 return err;
1855 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1856 snd_pcm_hw_rule_mul, NULL,
1857 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1858 if (err < 0)
1859 return err;
1860 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1861 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1862 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1863 if (err < 0)
1864 return err;
1865 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1866 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1867 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1868 if (err < 0)
1869 return err;
1870 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1871 snd_pcm_hw_rule_muldivk, (void*) 8,
1872 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1873 if (err < 0)
1874 return err;
1875 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1876 snd_pcm_hw_rule_muldivk, (void*) 8,
1877 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1878 if (err < 0)
1879 return err;
1880 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1881 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1882 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1883 if (err < 0)
1884 return err;
1885 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1886 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1887 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1888 if (err < 0)
1889 return err;
1890 return 0;
1891 }
1892
1893 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1894 {
1895 struct snd_pcm_runtime *runtime = substream->runtime;
1896 struct snd_pcm_hardware *hw = &runtime->hw;
1897 int err;
1898 unsigned int mask = 0;
1899
1900 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1901 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1902 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1903 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1904 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1905 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1906 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1907 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1908 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1909 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1910 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1911 }
1912 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1913 if (err < 0)
1914 return err;
1915
1916 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1917 if (err < 0)
1918 return err;
1919
1920 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1921 if (err < 0)
1922 return err;
1923
1924 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1925 hw->channels_min, hw->channels_max);
1926 if (err < 0)
1927 return err;
1928
1929 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1930 hw->rate_min, hw->rate_max);
1931 if (err < 0)
1932 return err;
1933
1934 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1935 hw->period_bytes_min, hw->period_bytes_max);
1936 if (err < 0)
1937 return err;
1938
1939 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1940 hw->periods_min, hw->periods_max);
1941 if (err < 0)
1942 return err;
1943
1944 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1945 hw->period_bytes_min, hw->buffer_bytes_max);
1946 if (err < 0)
1947 return err;
1948
1949 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1950 snd_pcm_hw_rule_buffer_bytes_max, substream,
1951 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1952 if (err < 0)
1953 return err;
1954
1955 /* FIXME: remove */
1956 if (runtime->dma_bytes) {
1957 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1958 if (err < 0)
1959 return -EINVAL;
1960 }
1961
1962 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1963 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1964 snd_pcm_hw_rule_rate, hw,
1965 SNDRV_PCM_HW_PARAM_RATE, -1);
1966 if (err < 0)
1967 return err;
1968 }
1969
1970 /* FIXME: this belong to lowlevel */
1971 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1972
1973 return 0;
1974 }
1975
1976 static void pcm_release_private(struct snd_pcm_substream *substream)
1977 {
1978 snd_pcm_unlink(substream);
1979 }
1980
1981 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1982 {
1983 substream->ref_count--;
1984 if (substream->ref_count > 0)
1985 return;
1986
1987 snd_pcm_drop(substream);
1988 if (substream->hw_opened) {
1989 if (substream->ops->hw_free != NULL)
1990 substream->ops->hw_free(substream);
1991 substream->ops->close(substream);
1992 substream->hw_opened = 0;
1993 }
1994 if (substream->pcm_release) {
1995 substream->pcm_release(substream);
1996 substream->pcm_release = NULL;
1997 }
1998 snd_pcm_detach_substream(substream);
1999 }
2000
2001 EXPORT_SYMBOL(snd_pcm_release_substream);
2002
2003 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2004 struct file *file,
2005 struct snd_pcm_substream **rsubstream)
2006 {
2007 struct snd_pcm_substream *substream;
2008 int err;
2009
2010 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2011 if (err < 0)
2012 return err;
2013 if (substream->ref_count > 1) {
2014 *rsubstream = substream;
2015 return 0;
2016 }
2017
2018 err = snd_pcm_hw_constraints_init(substream);
2019 if (err < 0) {
2020 snd_printd("snd_pcm_hw_constraints_init failed\n");
2021 goto error;
2022 }
2023
2024 if ((err = substream->ops->open(substream)) < 0)
2025 goto error;
2026
2027 substream->hw_opened = 1;
2028
2029 err = snd_pcm_hw_constraints_complete(substream);
2030 if (err < 0) {
2031 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2032 goto error;
2033 }
2034
2035 *rsubstream = substream;
2036 return 0;
2037
2038 error:
2039 snd_pcm_release_substream(substream);
2040 return err;
2041 }
2042
2043 EXPORT_SYMBOL(snd_pcm_open_substream);
2044
2045 static int snd_pcm_open_file(struct file *file,
2046 struct snd_pcm *pcm,
2047 int stream,
2048 struct snd_pcm_file **rpcm_file)
2049 {
2050 struct snd_pcm_file *pcm_file;
2051 struct snd_pcm_substream *substream;
2052 struct snd_pcm_str *str;
2053 int err;
2054
2055 if (rpcm_file)
2056 *rpcm_file = NULL;
2057
2058 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2059 if (err < 0)
2060 return err;
2061
2062 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2063 if (pcm_file == NULL) {
2064 snd_pcm_release_substream(substream);
2065 return -ENOMEM;
2066 }
2067 pcm_file->substream = substream;
2068 if (substream->ref_count == 1) {
2069 str = substream->pstr;
2070 substream->file = pcm_file;
2071 substream->pcm_release = pcm_release_private;
2072 }
2073 file->private_data = pcm_file;
2074 if (rpcm_file)
2075 *rpcm_file = pcm_file;
2076 return 0;
2077 }
2078
2079 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2080 {
2081 struct snd_pcm *pcm;
2082 int err = nonseekable_open(inode, file);
2083 if (err < 0)
2084 return err;
2085 pcm = snd_lookup_minor_data(iminor(inode),
2086 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2087 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2088 }
2089
2090 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2091 {
2092 struct snd_pcm *pcm;
2093 int err = nonseekable_open(inode, file);
2094 if (err < 0)
2095 return err;
2096 pcm = snd_lookup_minor_data(iminor(inode),
2097 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2098 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2099 }
2100
2101 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2102 {
2103 int err;
2104 struct snd_pcm_file *pcm_file;
2105 wait_queue_t wait;
2106
2107 if (pcm == NULL) {
2108 err = -ENODEV;
2109 goto __error1;
2110 }
2111 err = snd_card_file_add(pcm->card, file);
2112 if (err < 0)
2113 goto __error1;
2114 if (!try_module_get(pcm->card->module)) {
2115 err = -EFAULT;
2116 goto __error2;
2117 }
2118 init_waitqueue_entry(&wait, current);
2119 add_wait_queue(&pcm->open_wait, &wait);
2120 mutex_lock(&pcm->open_mutex);
2121 while (1) {
2122 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2123 if (err >= 0)
2124 break;
2125 if (err == -EAGAIN) {
2126 if (file->f_flags & O_NONBLOCK) {
2127 err = -EBUSY;
2128 break;
2129 }
2130 } else
2131 break;
2132 set_current_state(TASK_INTERRUPTIBLE);
2133 mutex_unlock(&pcm->open_mutex);
2134 schedule();
2135 mutex_lock(&pcm->open_mutex);
2136 if (signal_pending(current)) {
2137 err = -ERESTARTSYS;
2138 break;
2139 }
2140 }
2141 remove_wait_queue(&pcm->open_wait, &wait);
2142 mutex_unlock(&pcm->open_mutex);
2143 if (err < 0)
2144 goto __error;
2145 return err;
2146
2147 __error:
2148 module_put(pcm->card->module);
2149 __error2:
2150 snd_card_file_remove(pcm->card, file);
2151 __error1:
2152 return err;
2153 }
2154
2155 static int snd_pcm_release(struct inode *inode, struct file *file)
2156 {
2157 struct snd_pcm *pcm;
2158 struct snd_pcm_substream *substream;
2159 struct snd_pcm_file *pcm_file;
2160
2161 pcm_file = file->private_data;
2162 substream = pcm_file->substream;
2163 if (snd_BUG_ON(!substream))
2164 return -ENXIO;
2165 pcm = substream->pcm;
2166 mutex_lock(&pcm->open_mutex);
2167 snd_pcm_release_substream(substream);
2168 kfree(pcm_file);
2169 mutex_unlock(&pcm->open_mutex);
2170 wake_up(&pcm->open_wait);
2171 module_put(pcm->card->module);
2172 snd_card_file_remove(pcm->card, file);
2173 return 0;
2174 }
2175
2176 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2177 snd_pcm_uframes_t frames)
2178 {
2179 struct snd_pcm_runtime *runtime = substream->runtime;
2180 snd_pcm_sframes_t appl_ptr;
2181 snd_pcm_sframes_t ret;
2182 snd_pcm_sframes_t hw_avail;
2183
2184 if (frames == 0)
2185 return 0;
2186
2187 snd_pcm_stream_lock_irq(substream);
2188 switch (runtime->status->state) {
2189 case SNDRV_PCM_STATE_PREPARED:
2190 break;
2191 case SNDRV_PCM_STATE_DRAINING:
2192 case SNDRV_PCM_STATE_RUNNING:
2193 if (snd_pcm_update_hw_ptr(substream) >= 0)
2194 break;
2195 /* Fall through */
2196 case SNDRV_PCM_STATE_XRUN:
2197 ret = -EPIPE;
2198 goto __end;
2199 case SNDRV_PCM_STATE_SUSPENDED:
2200 ret = -ESTRPIPE;
2201 goto __end;
2202 default:
2203 ret = -EBADFD;
2204 goto __end;
2205 }
2206
2207 hw_avail = snd_pcm_playback_hw_avail(runtime);
2208 if (hw_avail <= 0) {
2209 ret = 0;
2210 goto __end;
2211 }
2212 if (frames > (snd_pcm_uframes_t)hw_avail)
2213 frames = hw_avail;
2214 appl_ptr = runtime->control->appl_ptr - frames;
2215 if (appl_ptr < 0)
2216 appl_ptr += runtime->boundary;
2217 runtime->control->appl_ptr = appl_ptr;
2218 ret = frames;
2219 __end:
2220 snd_pcm_stream_unlock_irq(substream);
2221 return ret;
2222 }
2223
2224 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2225 snd_pcm_uframes_t frames)
2226 {
2227 struct snd_pcm_runtime *runtime = substream->runtime;
2228 snd_pcm_sframes_t appl_ptr;
2229 snd_pcm_sframes_t ret;
2230 snd_pcm_sframes_t hw_avail;
2231
2232 if (frames == 0)
2233 return 0;
2234
2235 snd_pcm_stream_lock_irq(substream);
2236 switch (runtime->status->state) {
2237 case SNDRV_PCM_STATE_PREPARED:
2238 case SNDRV_PCM_STATE_DRAINING:
2239 break;
2240 case SNDRV_PCM_STATE_RUNNING:
2241 if (snd_pcm_update_hw_ptr(substream) >= 0)
2242 break;
2243 /* Fall through */
2244 case SNDRV_PCM_STATE_XRUN:
2245 ret = -EPIPE;
2246 goto __end;
2247 case SNDRV_PCM_STATE_SUSPENDED:
2248 ret = -ESTRPIPE;
2249 goto __end;
2250 default:
2251 ret = -EBADFD;
2252 goto __end;
2253 }
2254
2255 hw_avail = snd_pcm_capture_hw_avail(runtime);
2256 if (hw_avail <= 0) {
2257 ret = 0;
2258 goto __end;
2259 }
2260 if (frames > (snd_pcm_uframes_t)hw_avail)
2261 frames = hw_avail;
2262 appl_ptr = runtime->control->appl_ptr - frames;
2263 if (appl_ptr < 0)
2264 appl_ptr += runtime->boundary;
2265 runtime->control->appl_ptr = appl_ptr;
2266 ret = frames;
2267 __end:
2268 snd_pcm_stream_unlock_irq(substream);
2269 return ret;
2270 }
2271
2272 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2273 snd_pcm_uframes_t frames)
2274 {
2275 struct snd_pcm_runtime *runtime = substream->runtime;
2276 snd_pcm_sframes_t appl_ptr;
2277 snd_pcm_sframes_t ret;
2278 snd_pcm_sframes_t avail;
2279
2280 if (frames == 0)
2281 return 0;
2282
2283 snd_pcm_stream_lock_irq(substream);
2284 switch (runtime->status->state) {
2285 case SNDRV_PCM_STATE_PREPARED:
2286 case SNDRV_PCM_STATE_PAUSED:
2287 break;
2288 case SNDRV_PCM_STATE_DRAINING:
2289 case SNDRV_PCM_STATE_RUNNING:
2290 if (snd_pcm_update_hw_ptr(substream) >= 0)
2291 break;
2292 /* Fall through */
2293 case SNDRV_PCM_STATE_XRUN:
2294 ret = -EPIPE;
2295 goto __end;
2296 case SNDRV_PCM_STATE_SUSPENDED:
2297 ret = -ESTRPIPE;
2298 goto __end;
2299 default:
2300 ret = -EBADFD;
2301 goto __end;
2302 }
2303
2304 avail = snd_pcm_playback_avail(runtime);
2305 if (avail <= 0) {
2306 ret = 0;
2307 goto __end;
2308 }
2309 if (frames > (snd_pcm_uframes_t)avail)
2310 frames = avail;
2311 appl_ptr = runtime->control->appl_ptr + frames;
2312 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2313 appl_ptr -= runtime->boundary;
2314 runtime->control->appl_ptr = appl_ptr;
2315 ret = frames;
2316 __end:
2317 snd_pcm_stream_unlock_irq(substream);
2318 return ret;
2319 }
2320
2321 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2322 snd_pcm_uframes_t frames)
2323 {
2324 struct snd_pcm_runtime *runtime = substream->runtime;
2325 snd_pcm_sframes_t appl_ptr;
2326 snd_pcm_sframes_t ret;
2327 snd_pcm_sframes_t avail;
2328
2329 if (frames == 0)
2330 return 0;
2331
2332 snd_pcm_stream_lock_irq(substream);
2333 switch (runtime->status->state) {
2334 case SNDRV_PCM_STATE_PREPARED:
2335 case SNDRV_PCM_STATE_DRAINING:
2336 case SNDRV_PCM_STATE_PAUSED:
2337 break;
2338 case SNDRV_PCM_STATE_RUNNING:
2339 if (snd_pcm_update_hw_ptr(substream) >= 0)
2340 break;
2341 /* Fall through */
2342 case SNDRV_PCM_STATE_XRUN:
2343 ret = -EPIPE;
2344 goto __end;
2345 case SNDRV_PCM_STATE_SUSPENDED:
2346 ret = -ESTRPIPE;
2347 goto __end;
2348 default:
2349 ret = -EBADFD;
2350 goto __end;
2351 }
2352
2353 avail = snd_pcm_capture_avail(runtime);
2354 if (avail <= 0) {
2355 ret = 0;
2356 goto __end;
2357 }
2358 if (frames > (snd_pcm_uframes_t)avail)
2359 frames = avail;
2360 appl_ptr = runtime->control->appl_ptr + frames;
2361 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2362 appl_ptr -= runtime->boundary;
2363 runtime->control->appl_ptr = appl_ptr;
2364 ret = frames;
2365 __end:
2366 snd_pcm_stream_unlock_irq(substream);
2367 return ret;
2368 }
2369
2370 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2371 {
2372 struct snd_pcm_runtime *runtime = substream->runtime;
2373 int err;
2374
2375 snd_pcm_stream_lock_irq(substream);
2376 switch (runtime->status->state) {
2377 case SNDRV_PCM_STATE_DRAINING:
2378 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2379 goto __badfd;
2380 case SNDRV_PCM_STATE_RUNNING:
2381 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2382 break;
2383 /* Fall through */
2384 case SNDRV_PCM_STATE_PREPARED:
2385 case SNDRV_PCM_STATE_SUSPENDED:
2386 err = 0;
2387 break;
2388 case SNDRV_PCM_STATE_XRUN:
2389 err = -EPIPE;
2390 break;
2391 default:
2392 __badfd:
2393 err = -EBADFD;
2394 break;
2395 }
2396 snd_pcm_stream_unlock_irq(substream);
2397 return err;
2398 }
2399
2400 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2401 snd_pcm_sframes_t __user *res)
2402 {
2403 struct snd_pcm_runtime *runtime = substream->runtime;
2404 int err;
2405 snd_pcm_sframes_t n = 0;
2406
2407 snd_pcm_stream_lock_irq(substream);
2408 switch (runtime->status->state) {
2409 case SNDRV_PCM_STATE_DRAINING:
2410 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2411 goto __badfd;
2412 case SNDRV_PCM_STATE_RUNNING:
2413 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2414 break;
2415 /* Fall through */
2416 case SNDRV_PCM_STATE_PREPARED:
2417 case SNDRV_PCM_STATE_SUSPENDED:
2418 err = 0;
2419 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2420 n = snd_pcm_playback_hw_avail(runtime);
2421 else
2422 n = snd_pcm_capture_avail(runtime);
2423 n += runtime->delay;
2424 break;
2425 case SNDRV_PCM_STATE_XRUN:
2426 err = -EPIPE;
2427 break;
2428 default:
2429 __badfd:
2430 err = -EBADFD;
2431 break;
2432 }
2433 snd_pcm_stream_unlock_irq(substream);
2434 if (!err)
2435 if (put_user(n, res))
2436 err = -EFAULT;
2437 return err;
2438 }
2439
2440 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2441 struct snd_pcm_sync_ptr __user *_sync_ptr)
2442 {
2443 struct snd_pcm_runtime *runtime = substream->runtime;
2444 struct snd_pcm_sync_ptr sync_ptr;
2445 volatile struct snd_pcm_mmap_status *status;
2446 volatile struct snd_pcm_mmap_control *control;
2447 int err;
2448
2449 memset(&sync_ptr, 0, sizeof(sync_ptr));
2450 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2451 return -EFAULT;
2452 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2453 return -EFAULT;
2454 status = runtime->status;
2455 control = runtime->control;
2456 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2457 err = snd_pcm_hwsync(substream);
2458 if (err < 0)
2459 return err;
2460 }
2461 snd_pcm_stream_lock_irq(substream);
2462 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2463 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2464 else
2465 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2466 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2467 control->avail_min = sync_ptr.c.control.avail_min;
2468 else
2469 sync_ptr.c.control.avail_min = control->avail_min;
2470 sync_ptr.s.status.state = status->state;
2471 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2472 sync_ptr.s.status.tstamp = status->tstamp;
2473 sync_ptr.s.status.suspended_state = status->suspended_state;
2474 snd_pcm_stream_unlock_irq(substream);
2475 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2476 return -EFAULT;
2477 return 0;
2478 }
2479
2480 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2481 {
2482 struct snd_pcm_runtime *runtime = substream->runtime;
2483 int arg;
2484
2485 if (get_user(arg, _arg))
2486 return -EFAULT;
2487 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2488 return -EINVAL;
2489 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2490 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2491 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2492 return 0;
2493 }
2494
2495 static int snd_pcm_common_ioctl1(struct file *file,
2496 struct snd_pcm_substream *substream,
2497 unsigned int cmd, void __user *arg)
2498 {
2499 switch (cmd) {
2500 case SNDRV_PCM_IOCTL_PVERSION:
2501 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2502 case SNDRV_PCM_IOCTL_INFO:
2503 return snd_pcm_info_user(substream, arg);
2504 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2505 return 0;
2506 case SNDRV_PCM_IOCTL_TTSTAMP:
2507 return snd_pcm_tstamp(substream, arg);
2508 case SNDRV_PCM_IOCTL_HW_REFINE:
2509 return snd_pcm_hw_refine_user(substream, arg);
2510 case SNDRV_PCM_IOCTL_HW_PARAMS:
2511 return snd_pcm_hw_params_user(substream, arg);
2512 case SNDRV_PCM_IOCTL_HW_FREE:
2513 return snd_pcm_hw_free(substream);
2514 case SNDRV_PCM_IOCTL_SW_PARAMS:
2515 return snd_pcm_sw_params_user(substream, arg);
2516 case SNDRV_PCM_IOCTL_STATUS:
2517 return snd_pcm_status_user(substream, arg);
2518 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2519 return snd_pcm_channel_info_user(substream, arg);
2520 case SNDRV_PCM_IOCTL_PREPARE:
2521 return snd_pcm_prepare(substream, file);
2522 case SNDRV_PCM_IOCTL_RESET:
2523 return snd_pcm_reset(substream);
2524 case SNDRV_PCM_IOCTL_START:
2525 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2526 case SNDRV_PCM_IOCTL_LINK:
2527 return snd_pcm_link(substream, (int)(unsigned long) arg);
2528 case SNDRV_PCM_IOCTL_UNLINK:
2529 return snd_pcm_unlink(substream);
2530 case SNDRV_PCM_IOCTL_RESUME:
2531 return snd_pcm_resume(substream);
2532 case SNDRV_PCM_IOCTL_XRUN:
2533 return snd_pcm_xrun(substream);
2534 case SNDRV_PCM_IOCTL_HWSYNC:
2535 return snd_pcm_hwsync(substream);
2536 case SNDRV_PCM_IOCTL_DELAY:
2537 return snd_pcm_delay(substream, arg);
2538 case SNDRV_PCM_IOCTL_SYNC_PTR:
2539 return snd_pcm_sync_ptr(substream, arg);
2540 #ifdef CONFIG_SND_SUPPORT_OLD_API
2541 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2542 return snd_pcm_hw_refine_old_user(substream, arg);
2543 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2544 return snd_pcm_hw_params_old_user(substream, arg);
2545 #endif
2546 case SNDRV_PCM_IOCTL_DRAIN:
2547 return snd_pcm_drain(substream, file);
2548 case SNDRV_PCM_IOCTL_DROP:
2549 return snd_pcm_drop(substream);
2550 case SNDRV_PCM_IOCTL_PAUSE:
2551 {
2552 int res;
2553 snd_pcm_stream_lock_irq(substream);
2554 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2555 snd_pcm_stream_unlock_irq(substream);
2556 return res;
2557 }
2558 }
2559 snd_printd("unknown ioctl = 0x%x\n", cmd);
2560 return -ENOTTY;
2561 }
2562
2563 static int snd_pcm_playback_ioctl1(struct file *file,
2564 struct snd_pcm_substream *substream,
2565 unsigned int cmd, void __user *arg)
2566 {
2567 if (snd_BUG_ON(!substream))
2568 return -ENXIO;
2569 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2570 return -EINVAL;
2571 switch (cmd) {
2572 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2573 {
2574 struct snd_xferi xferi;
2575 struct snd_xferi __user *_xferi = arg;
2576 struct snd_pcm_runtime *runtime = substream->runtime;
2577 snd_pcm_sframes_t result;
2578 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2579 return -EBADFD;
2580 if (put_user(0, &_xferi->result))
2581 return -EFAULT;
2582 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2583 return -EFAULT;
2584 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2585 __put_user(result, &_xferi->result);
2586 return result < 0 ? result : 0;
2587 }
2588 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2589 {
2590 struct snd_xfern xfern;
2591 struct snd_xfern __user *_xfern = arg;
2592 struct snd_pcm_runtime *runtime = substream->runtime;
2593 void __user **bufs;
2594 snd_pcm_sframes_t result;
2595 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2596 return -EBADFD;
2597 if (runtime->channels > 128)
2598 return -EINVAL;
2599 if (put_user(0, &_xfern->result))
2600 return -EFAULT;
2601 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2602 return -EFAULT;
2603
2604 bufs = memdup_user(xfern.bufs,
2605 sizeof(void *) * runtime->channels);
2606 if (IS_ERR(bufs))
2607 return PTR_ERR(bufs);
2608 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2609 kfree(bufs);
2610 __put_user(result, &_xfern->result);
2611 return result < 0 ? result : 0;
2612 }
2613 case SNDRV_PCM_IOCTL_REWIND:
2614 {
2615 snd_pcm_uframes_t frames;
2616 snd_pcm_uframes_t __user *_frames = arg;
2617 snd_pcm_sframes_t result;
2618 if (get_user(frames, _frames))
2619 return -EFAULT;
2620 if (put_user(0, _frames))
2621 return -EFAULT;
2622 result = snd_pcm_playback_rewind(substream, frames);
2623 __put_user(result, _frames);
2624 return result < 0 ? result : 0;
2625 }
2626 case SNDRV_PCM_IOCTL_FORWARD:
2627 {
2628 snd_pcm_uframes_t frames;
2629 snd_pcm_uframes_t __user *_frames = arg;
2630 snd_pcm_sframes_t result;
2631 if (get_user(frames, _frames))
2632 return -EFAULT;
2633 if (put_user(0, _frames))
2634 return -EFAULT;
2635 result = snd_pcm_playback_forward(substream, frames);
2636 __put_user(result, _frames);
2637 return result < 0 ? result : 0;
2638 }
2639 }
2640 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2641 }
2642
2643 static int snd_pcm_capture_ioctl1(struct file *file,
2644 struct snd_pcm_substream *substream,
2645 unsigned int cmd, void __user *arg)
2646 {
2647 if (snd_BUG_ON(!substream))
2648 return -ENXIO;
2649 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2650 return -EINVAL;
2651 switch (cmd) {
2652 case SNDRV_PCM_IOCTL_READI_FRAMES:
2653 {
2654 struct snd_xferi xferi;
2655 struct snd_xferi __user *_xferi = arg;
2656 struct snd_pcm_runtime *runtime = substream->runtime;
2657 snd_pcm_sframes_t result;
2658 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2659 return -EBADFD;
2660 if (put_user(0, &_xferi->result))
2661 return -EFAULT;
2662 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2663 return -EFAULT;
2664 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2665 __put_user(result, &_xferi->result);
2666 return result < 0 ? result : 0;
2667 }
2668 case SNDRV_PCM_IOCTL_READN_FRAMES:
2669 {
2670 struct snd_xfern xfern;
2671 struct snd_xfern __user *_xfern = arg;
2672 struct snd_pcm_runtime *runtime = substream->runtime;
2673 void *bufs;
2674 snd_pcm_sframes_t result;
2675 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2676 return -EBADFD;
2677 if (runtime->channels > 128)
2678 return -EINVAL;
2679 if (put_user(0, &_xfern->result))
2680 return -EFAULT;
2681 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2682 return -EFAULT;
2683
2684 bufs = memdup_user(xfern.bufs,
2685 sizeof(void *) * runtime->channels);
2686 if (IS_ERR(bufs))
2687 return PTR_ERR(bufs);
2688 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2689 kfree(bufs);
2690 __put_user(result, &_xfern->result);
2691 return result < 0 ? result : 0;
2692 }
2693 case SNDRV_PCM_IOCTL_REWIND:
2694 {
2695 snd_pcm_uframes_t frames;
2696 snd_pcm_uframes_t __user *_frames = arg;
2697 snd_pcm_sframes_t result;
2698 if (get_user(frames, _frames))
2699 return -EFAULT;
2700 if (put_user(0, _frames))
2701 return -EFAULT;
2702 result = snd_pcm_capture_rewind(substream, frames);
2703 __put_user(result, _frames);
2704 return result < 0 ? result : 0;
2705 }
2706 case SNDRV_PCM_IOCTL_FORWARD:
2707 {
2708 snd_pcm_uframes_t frames;
2709 snd_pcm_uframes_t __user *_frames = arg;
2710 snd_pcm_sframes_t result;
2711 if (get_user(frames, _frames))
2712 return -EFAULT;
2713 if (put_user(0, _frames))
2714 return -EFAULT;
2715 result = snd_pcm_capture_forward(substream, frames);
2716 __put_user(result, _frames);
2717 return result < 0 ? result : 0;
2718 }
2719 }
2720 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2721 }
2722
2723 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2724 unsigned long arg)
2725 {
2726 struct snd_pcm_file *pcm_file;
2727
2728 pcm_file = file->private_data;
2729
2730 if (((cmd >> 8) & 0xff) != 'A')
2731 return -ENOTTY;
2732
2733 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2734 (void __user *)arg);
2735 }
2736
2737 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2738 unsigned long arg)
2739 {
2740 struct snd_pcm_file *pcm_file;
2741
2742 pcm_file = file->private_data;
2743
2744 if (((cmd >> 8) & 0xff) != 'A')
2745 return -ENOTTY;
2746
2747 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2748 (void __user *)arg);
2749 }
2750
2751 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2752 unsigned int cmd, void *arg)
2753 {
2754 mm_segment_t fs;
2755 int result;
2756
2757 fs = snd_enter_user();
2758 switch (substream->stream) {
2759 case SNDRV_PCM_STREAM_PLAYBACK:
2760 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2761 (void __user *)arg);
2762 break;
2763 case SNDRV_PCM_STREAM_CAPTURE:
2764 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2765 (void __user *)arg);
2766 break;
2767 default:
2768 result = -EINVAL;
2769 break;
2770 }
2771 snd_leave_user(fs);
2772 return result;
2773 }
2774
2775 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2776
2777 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2778 loff_t * offset)
2779 {
2780 struct snd_pcm_file *pcm_file;
2781 struct snd_pcm_substream *substream;
2782 struct snd_pcm_runtime *runtime;
2783 snd_pcm_sframes_t result;
2784
2785 pcm_file = file->private_data;
2786 substream = pcm_file->substream;
2787 if (PCM_RUNTIME_CHECK(substream))
2788 return -ENXIO;
2789 runtime = substream->runtime;
2790 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2791 return -EBADFD;
2792 if (!frame_aligned(runtime, count))
2793 return -EINVAL;
2794 count = bytes_to_frames(runtime, count);
2795 result = snd_pcm_lib_read(substream, buf, count);
2796 if (result > 0)
2797 result = frames_to_bytes(runtime, result);
2798 return result;
2799 }
2800
2801 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2802 size_t count, loff_t * offset)
2803 {
2804 struct snd_pcm_file *pcm_file;
2805 struct snd_pcm_substream *substream;
2806 struct snd_pcm_runtime *runtime;
2807 snd_pcm_sframes_t result;
2808
2809 pcm_file = file->private_data;
2810 substream = pcm_file->substream;
2811 if (PCM_RUNTIME_CHECK(substream))
2812 return -ENXIO;
2813 runtime = substream->runtime;
2814 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2815 return -EBADFD;
2816 if (!frame_aligned(runtime, count))
2817 return -EINVAL;
2818 count = bytes_to_frames(runtime, count);
2819 result = snd_pcm_lib_write(substream, buf, count);
2820 if (result > 0)
2821 result = frames_to_bytes(runtime, result);
2822 return result;
2823 }
2824
2825 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2826 unsigned long nr_segs, loff_t pos)
2827
2828 {
2829 struct snd_pcm_file *pcm_file;
2830 struct snd_pcm_substream *substream;
2831 struct snd_pcm_runtime *runtime;
2832 snd_pcm_sframes_t result;
2833 unsigned long i;
2834 void __user **bufs;
2835 snd_pcm_uframes_t frames;
2836
2837 pcm_file = iocb->ki_filp->private_data;
2838 substream = pcm_file->substream;
2839 if (PCM_RUNTIME_CHECK(substream))
2840 return -ENXIO;
2841 runtime = substream->runtime;
2842 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2843 return -EBADFD;
2844 if (nr_segs > 1024 || nr_segs != runtime->channels)
2845 return -EINVAL;
2846 if (!frame_aligned(runtime, iov->iov_len))
2847 return -EINVAL;
2848 frames = bytes_to_samples(runtime, iov->iov_len);
2849 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2850 if (bufs == NULL)
2851 return -ENOMEM;
2852 for (i = 0; i < nr_segs; ++i)
2853 bufs[i] = iov[i].iov_base;
2854 result = snd_pcm_lib_readv(substream, bufs, frames);
2855 if (result > 0)
2856 result = frames_to_bytes(runtime, result);
2857 kfree(bufs);
2858 return result;
2859 }
2860
2861 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2862 unsigned long nr_segs, loff_t pos)
2863 {
2864 struct snd_pcm_file *pcm_file;
2865 struct snd_pcm_substream *substream;
2866 struct snd_pcm_runtime *runtime;
2867 snd_pcm_sframes_t result;
2868 unsigned long i;
2869 void __user **bufs;
2870 snd_pcm_uframes_t frames;
2871
2872 pcm_file = iocb->ki_filp->private_data;
2873 substream = pcm_file->substream;
2874 if (PCM_RUNTIME_CHECK(substream))
2875 return -ENXIO;
2876 runtime = substream->runtime;
2877 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2878 return -EBADFD;
2879 if (nr_segs > 128 || nr_segs != runtime->channels ||
2880 !frame_aligned(runtime, iov->iov_len))
2881 return -EINVAL;
2882 frames = bytes_to_samples(runtime, iov->iov_len);
2883 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2884 if (bufs == NULL)
2885 return -ENOMEM;
2886 for (i = 0; i < nr_segs; ++i)
2887 bufs[i] = iov[i].iov_base;
2888 result = snd_pcm_lib_writev(substream, bufs, frames);
2889 if (result > 0)
2890 result = frames_to_bytes(runtime, result);
2891 kfree(bufs);
2892 return result;
2893 }
2894
2895 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2896 {
2897 struct snd_pcm_file *pcm_file;
2898 struct snd_pcm_substream *substream;
2899 struct snd_pcm_runtime *runtime;
2900 unsigned int mask;
2901 snd_pcm_uframes_t avail;
2902
2903 pcm_file = file->private_data;
2904
2905 substream = pcm_file->substream;
2906 if (PCM_RUNTIME_CHECK(substream))
2907 return -ENXIO;
2908 runtime = substream->runtime;
2909
2910 poll_wait(file, &runtime->sleep, wait);
2911
2912 snd_pcm_stream_lock_irq(substream);
2913 avail = snd_pcm_playback_avail(runtime);
2914 switch (runtime->status->state) {
2915 case SNDRV_PCM_STATE_RUNNING:
2916 case SNDRV_PCM_STATE_PREPARED:
2917 case SNDRV_PCM_STATE_PAUSED:
2918 if (avail >= runtime->control->avail_min) {
2919 mask = POLLOUT | POLLWRNORM;
2920 break;
2921 }
2922 /* Fall through */
2923 case SNDRV_PCM_STATE_DRAINING:
2924 mask = 0;
2925 break;
2926 default:
2927 mask = POLLOUT | POLLWRNORM | POLLERR;
2928 break;
2929 }
2930 snd_pcm_stream_unlock_irq(substream);
2931 return mask;
2932 }
2933
2934 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2935 {
2936 struct snd_pcm_file *pcm_file;
2937 struct snd_pcm_substream *substream;
2938 struct snd_pcm_runtime *runtime;
2939 unsigned int mask;
2940 snd_pcm_uframes_t avail;
2941
2942 pcm_file = file->private_data;
2943
2944 substream = pcm_file->substream;
2945 if (PCM_RUNTIME_CHECK(substream))
2946 return -ENXIO;
2947 runtime = substream->runtime;
2948
2949 poll_wait(file, &runtime->sleep, wait);
2950
2951 snd_pcm_stream_lock_irq(substream);
2952 avail = snd_pcm_capture_avail(runtime);
2953 switch (runtime->status->state) {
2954 case SNDRV_PCM_STATE_RUNNING:
2955 case SNDRV_PCM_STATE_PREPARED:
2956 case SNDRV_PCM_STATE_PAUSED:
2957 if (avail >= runtime->control->avail_min) {
2958 mask = POLLIN | POLLRDNORM;
2959 break;
2960 }
2961 mask = 0;
2962 break;
2963 case SNDRV_PCM_STATE_DRAINING:
2964 if (avail > 0) {
2965 mask = POLLIN | POLLRDNORM;
2966 break;
2967 }
2968 /* Fall through */
2969 default:
2970 mask = POLLIN | POLLRDNORM | POLLERR;
2971 break;
2972 }
2973 snd_pcm_stream_unlock_irq(substream);
2974 return mask;
2975 }
2976
2977 /*
2978 * mmap support
2979 */
2980
2981 /*
2982 * Only on coherent architectures, we can mmap the status and the control records
2983 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2984 */
2985 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2986 /*
2987 * mmap status record
2988 */
2989 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2990 struct vm_fault *vmf)
2991 {
2992 struct snd_pcm_substream *substream = area->vm_private_data;
2993 struct snd_pcm_runtime *runtime;
2994
2995 if (substream == NULL)
2996 return VM_FAULT_SIGBUS;
2997 runtime = substream->runtime;
2998 vmf->page = virt_to_page(runtime->status);
2999 get_page(vmf->page);
3000 return 0;
3001 }
3002
3003 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3004 {
3005 .fault = snd_pcm_mmap_status_fault,
3006 };
3007
3008 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3009 struct vm_area_struct *area)
3010 {
3011 struct snd_pcm_runtime *runtime;
3012 long size;
3013 if (!(area->vm_flags & VM_READ))
3014 return -EINVAL;
3015 runtime = substream->runtime;
3016 size = area->vm_end - area->vm_start;
3017 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3018 return -EINVAL;
3019 area->vm_ops = &snd_pcm_vm_ops_status;
3020 area->vm_private_data = substream;
3021 area->vm_flags |= VM_RESERVED;
3022 return 0;
3023 }
3024
3025 /*
3026 * mmap control record
3027 */
3028 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3029 struct vm_fault *vmf)
3030 {
3031 struct snd_pcm_substream *substream = area->vm_private_data;
3032 struct snd_pcm_runtime *runtime;
3033
3034 if (substream == NULL)
3035 return VM_FAULT_SIGBUS;
3036 runtime = substream->runtime;
3037 vmf->page = virt_to_page(runtime->control);
3038 get_page(vmf->page);
3039 return 0;
3040 }
3041
3042 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3043 {
3044 .fault = snd_pcm_mmap_control_fault,
3045 };
3046
3047 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3048 struct vm_area_struct *area)
3049 {
3050 struct snd_pcm_runtime *runtime;
3051 long size;
3052 if (!(area->vm_flags & VM_READ))
3053 return -EINVAL;
3054 runtime = substream->runtime;
3055 size = area->vm_end - area->vm_start;
3056 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3057 return -EINVAL;
3058 area->vm_ops = &snd_pcm_vm_ops_control;
3059 area->vm_private_data = substream;
3060 area->vm_flags |= VM_RESERVED;
3061 return 0;
3062 }
3063 #else /* ! coherent mmap */
3064 /*
3065 * don't support mmap for status and control records.
3066 */
3067 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3068 struct vm_area_struct *area)
3069 {
3070 return -ENXIO;
3071 }
3072 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3073 struct vm_area_struct *area)
3074 {
3075 return -ENXIO;
3076 }
3077 #endif /* coherent mmap */
3078
3079 static inline struct page *
3080 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3081 {
3082 void *vaddr = substream->runtime->dma_area + ofs;
3083 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3084 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3085 return virt_to_page(CAC_ADDR(vaddr));
3086 #endif
3087 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3088 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3089 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3090 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3091 /* assume dma_handle set via pfn_to_phys() in
3092 * mm/dma-noncoherent.c
3093 */
3094 return pfn_to_page(addr >> PAGE_SHIFT);
3095 }
3096 #endif
3097 return virt_to_page(vaddr);
3098 }
3099
3100 /*
3101 * fault callback for mmapping a RAM page
3102 */
3103 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3104 struct vm_fault *vmf)
3105 {
3106 struct snd_pcm_substream *substream = area->vm_private_data;
3107 struct snd_pcm_runtime *runtime;
3108 unsigned long offset;
3109 struct page * page;
3110 size_t dma_bytes;
3111
3112 if (substream == NULL)
3113 return VM_FAULT_SIGBUS;
3114 runtime = substream->runtime;
3115 offset = vmf->pgoff << PAGE_SHIFT;
3116 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3117 if (offset > dma_bytes - PAGE_SIZE)
3118 return VM_FAULT_SIGBUS;
3119 if (substream->ops->page)
3120 page = substream->ops->page(substream, offset);
3121 else
3122 page = snd_pcm_default_page_ops(substream, offset);
3123 if (!page)
3124 return VM_FAULT_SIGBUS;
3125 get_page(page);
3126 vmf->page = page;
3127 return 0;
3128 }
3129
3130 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3131 .open = snd_pcm_mmap_data_open,
3132 .close = snd_pcm_mmap_data_close,
3133 };
3134
3135 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3136 .open = snd_pcm_mmap_data_open,
3137 .close = snd_pcm_mmap_data_close,
3138 .fault = snd_pcm_mmap_data_fault,
3139 };
3140
3141 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3142 /* This should be defined / handled globally! */
3143 #ifdef CONFIG_ARM
3144 #define ARCH_HAS_DMA_MMAP_COHERENT
3145 #endif
3146 #endif
3147
3148 /*
3149 * mmap the DMA buffer on RAM
3150 */
3151 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3152 struct vm_area_struct *area)
3153 {
3154 area->vm_flags |= VM_RESERVED;
3155 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3156 if (!substream->ops->page &&
3157 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3158 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3159 area,
3160 substream->runtime->dma_area,
3161 substream->runtime->dma_addr,
3162 area->vm_end - area->vm_start);
3163 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3164 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3165 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3166 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3167 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3168 /* mmap with fault handler */
3169 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3170 return 0;
3171 }
3172
3173 /*
3174 * mmap the DMA buffer on I/O memory area
3175 */
3176 #if SNDRV_PCM_INFO_MMAP_IOMEM
3177 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3178 struct vm_area_struct *area)
3179 {
3180 long size;
3181 unsigned long offset;
3182
3183 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3184 area->vm_flags |= VM_IO;
3185 size = area->vm_end - area->vm_start;
3186 offset = area->vm_pgoff << PAGE_SHIFT;
3187 if (io_remap_pfn_range(area, area->vm_start,
3188 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3189 size, area->vm_page_prot))
3190 return -EAGAIN;
3191 return 0;
3192 }
3193
3194 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3195 #endif /* SNDRV_PCM_INFO_MMAP */
3196
3197 /* mmap callback with pgprot_noncached */
3198 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
3199 struct vm_area_struct *area)
3200 {
3201 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3202 return snd_pcm_default_mmap(substream, area);
3203 }
3204 EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
3205
3206 /*
3207 * mmap DMA buffer
3208 */
3209 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3210 struct vm_area_struct *area)
3211 {
3212 struct snd_pcm_runtime *runtime;
3213 long size;
3214 unsigned long offset;
3215 size_t dma_bytes;
3216 int err;
3217
3218 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3219 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3220 return -EINVAL;
3221 } else {
3222 if (!(area->vm_flags & VM_READ))
3223 return -EINVAL;
3224 }
3225 runtime = substream->runtime;
3226 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3227 return -EBADFD;
3228 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3229 return -ENXIO;
3230 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3231 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3232 return -EINVAL;
3233 size = area->vm_end - area->vm_start;
3234 offset = area->vm_pgoff << PAGE_SHIFT;
3235 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3236 if ((size_t)size > dma_bytes)
3237 return -EINVAL;
3238 if (offset > dma_bytes - size)
3239 return -EINVAL;
3240
3241 area->vm_ops = &snd_pcm_vm_ops_data;
3242 area->vm_private_data = substream;
3243 if (substream->ops->mmap)
3244 err = substream->ops->mmap(substream, area);
3245 else
3246 err = snd_pcm_default_mmap(substream, area);
3247 if (!err)
3248 atomic_inc(&substream->mmap_count);
3249 return err;
3250 }
3251
3252 EXPORT_SYMBOL(snd_pcm_mmap_data);
3253
3254 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3255 {
3256 struct snd_pcm_file * pcm_file;
3257 struct snd_pcm_substream *substream;
3258 unsigned long offset;
3259
3260 pcm_file = file->private_data;
3261 substream = pcm_file->substream;
3262 if (PCM_RUNTIME_CHECK(substream))
3263 return -ENXIO;
3264
3265 offset = area->vm_pgoff << PAGE_SHIFT;
3266 switch (offset) {
3267 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3268 if (pcm_file->no_compat_mmap)
3269 return -ENXIO;
3270 return snd_pcm_mmap_status(substream, file, area);
3271 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3272 if (pcm_file->no_compat_mmap)
3273 return -ENXIO;
3274 return snd_pcm_mmap_control(substream, file, area);
3275 default:
3276 return snd_pcm_mmap_data(substream, file, area);
3277 }
3278 return 0;
3279 }
3280
3281 static int snd_pcm_fasync(int fd, struct file * file, int on)
3282 {
3283 struct snd_pcm_file * pcm_file;
3284 struct snd_pcm_substream *substream;
3285 struct snd_pcm_runtime *runtime;
3286
3287 pcm_file = file->private_data;
3288 substream = pcm_file->substream;
3289 if (PCM_RUNTIME_CHECK(substream))
3290 return -ENXIO;
3291 runtime = substream->runtime;
3292 return fasync_helper(fd, file, on, &runtime->fasync);
3293 }
3294
3295 /*
3296 * ioctl32 compat
3297 */
3298 #ifdef CONFIG_COMPAT
3299 #include "pcm_compat.c"
3300 #else
3301 #define snd_pcm_ioctl_compat NULL
3302 #endif
3303
3304 /*
3305 * To be removed helpers to keep binary compatibility
3306 */
3307
3308 #ifdef CONFIG_SND_SUPPORT_OLD_API
3309 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3310 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3311
3312 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3313 struct snd_pcm_hw_params_old *oparams)
3314 {
3315 unsigned int i;
3316
3317 memset(params, 0, sizeof(*params));
3318 params->flags = oparams->flags;
3319 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3320 params->masks[i].bits[0] = oparams->masks[i];
3321 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3322 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3323 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3324 params->info = oparams->info;
3325 params->msbits = oparams->msbits;
3326 params->rate_num = oparams->rate_num;
3327 params->rate_den = oparams->rate_den;
3328 params->fifo_size = oparams->fifo_size;
3329 }
3330
3331 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3332 struct snd_pcm_hw_params *params)
3333 {
3334 unsigned int i;
3335
3336 memset(oparams, 0, sizeof(*oparams));
3337 oparams->flags = params->flags;
3338 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3339 oparams->masks[i] = params->masks[i].bits[0];
3340 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3341 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3342 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3343 oparams->info = params->info;
3344 oparams->msbits = params->msbits;
3345 oparams->rate_num = params->rate_num;
3346 oparams->rate_den = params->rate_den;
3347 oparams->fifo_size = params->fifo_size;
3348 }
3349
3350 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3351 struct snd_pcm_hw_params_old __user * _oparams)
3352 {
3353 struct snd_pcm_hw_params *params;
3354 struct snd_pcm_hw_params_old *oparams = NULL;
3355 int err;
3356
3357 params = kmalloc(sizeof(*params), GFP_KERNEL);
3358 if (!params)
3359 return -ENOMEM;
3360
3361 oparams = memdup_user(_oparams, sizeof(*oparams));
3362 if (IS_ERR(oparams)) {
3363 err = PTR_ERR(oparams);
3364 goto out;
3365 }
3366 snd_pcm_hw_convert_from_old_params(params, oparams);
3367 err = snd_pcm_hw_refine(substream, params);
3368 snd_pcm_hw_convert_to_old_params(oparams, params);
3369 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3370 if (!err)
3371 err = -EFAULT;
3372 }
3373
3374 kfree(oparams);
3375 out:
3376 kfree(params);
3377 return err;
3378 }
3379
3380 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3381 struct snd_pcm_hw_params_old __user * _oparams)
3382 {
3383 struct snd_pcm_hw_params *params;
3384 struct snd_pcm_hw_params_old *oparams = NULL;
3385 int err;
3386
3387 params = kmalloc(sizeof(*params), GFP_KERNEL);
3388 if (!params)
3389 return -ENOMEM;
3390
3391 oparams = memdup_user(_oparams, sizeof(*oparams));
3392 if (IS_ERR(oparams)) {
3393 err = PTR_ERR(oparams);
3394 goto out;
3395 }
3396 snd_pcm_hw_convert_from_old_params(params, oparams);
3397 err = snd_pcm_hw_params(substream, params);
3398 snd_pcm_hw_convert_to_old_params(oparams, params);
3399 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3400 if (!err)
3401 err = -EFAULT;
3402 }
3403
3404 kfree(oparams);
3405 out:
3406 kfree(params);
3407 return err;
3408 }
3409 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3410
3411 #ifndef CONFIG_MMU
3412 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3413 unsigned long addr,
3414 unsigned long len,
3415 unsigned long pgoff,
3416 unsigned long flags)
3417 {
3418 struct snd_pcm_file *pcm_file = file->private_data;
3419 struct snd_pcm_substream *substream = pcm_file->substream;
3420 struct snd_pcm_runtime *runtime = substream->runtime;
3421 unsigned long offset = pgoff << PAGE_SHIFT;
3422
3423 switch (offset) {
3424 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3425 return (unsigned long)runtime->status;
3426 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3427 return (unsigned long)runtime->control;
3428 default:
3429 return (unsigned long)runtime->dma_area + offset;
3430 }
3431 }
3432 #else
3433 # define snd_pcm_get_unmapped_area NULL
3434 #endif
3435
3436 /*
3437 * Register section
3438 */
3439
3440 const struct file_operations snd_pcm_f_ops[2] = {
3441 {
3442 .owner = THIS_MODULE,
3443 .write = snd_pcm_write,
3444 .aio_write = snd_pcm_aio_write,
3445 .open = snd_pcm_playback_open,
3446 .release = snd_pcm_release,
3447 .llseek = no_llseek,
3448 .poll = snd_pcm_playback_poll,
3449 .unlocked_ioctl = snd_pcm_playback_ioctl,
3450 .compat_ioctl = snd_pcm_ioctl_compat,
3451 .mmap = snd_pcm_mmap,
3452 .fasync = snd_pcm_fasync,
3453 .get_unmapped_area = snd_pcm_get_unmapped_area,
3454 },
3455 {
3456 .owner = THIS_MODULE,
3457 .read = snd_pcm_read,
3458 .aio_read = snd_pcm_aio_read,
3459 .open = snd_pcm_capture_open,
3460 .release = snd_pcm_release,
3461 .llseek = no_llseek,
3462 .poll = snd_pcm_capture_poll,
3463 .unlocked_ioctl = snd_pcm_capture_ioctl,
3464 .compat_ioctl = snd_pcm_ioctl_compat,
3465 .mmap = snd_pcm_mmap,
3466 .fasync = snd_pcm_fasync,
3467 .get_unmapped_area = snd_pcm_get_unmapped_area,
3468 }
3469 };
linux-next