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x86: remove misleading comments in trampoline_*.S
[wrt350n-kernel.git] / sound / core / pcm_native.c
blob62449117ee14f6a13cc0f76d5bba6624df3596b9
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/mm.h>
23 #include <linux/file.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/latency.h>
27 #include <linux/uio.h>
28 #include <sound/core.h>
29 #include <sound/control.h>
30 #include <sound/info.h>
31 #include <sound/pcm.h>
32 #include <sound/pcm_params.h>
33 #include <sound/timer.h>
34 #include <sound/minors.h>
35 #include <asm/io.h>
36
37 /*
38 * Compatibility
39 */
40
41 struct snd_pcm_hw_params_old {
42 unsigned int flags;
43 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
44 SNDRV_PCM_HW_PARAM_ACCESS + 1];
45 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
46 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
47 unsigned int rmask;
48 unsigned int cmask;
49 unsigned int info;
50 unsigned int msbits;
51 unsigned int rate_num;
52 unsigned int rate_den;
53 snd_pcm_uframes_t fifo_size;
54 unsigned char reserved[64];
55 };
56
57 #ifdef CONFIG_SND_SUPPORT_OLD_API
58 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
59 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
60
61 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
62 struct snd_pcm_hw_params_old __user * _oparams);
63 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
64 struct snd_pcm_hw_params_old __user * _oparams);
65 #endif
66 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
67
68 /*
69 *
70 */
71
72 DEFINE_RWLOCK(snd_pcm_link_rwlock);
73 EXPORT_SYMBOL(snd_pcm_link_rwlock);
74
75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
76
77 static inline mm_segment_t snd_enter_user(void)
78 {
79 mm_segment_t fs = get_fs();
80 set_fs(get_ds());
81 return fs;
82 }
83
84 static inline void snd_leave_user(mm_segment_t fs)
85 {
86 set_fs(fs);
87 }
88
89
90
91 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
92 {
93 struct snd_pcm_runtime *runtime;
94 struct snd_pcm *pcm = substream->pcm;
95 struct snd_pcm_str *pstr = substream->pstr;
96
97 snd_assert(substream != NULL, return -ENXIO);
98 memset(info, 0, sizeof(*info));
99 info->card = pcm->card->number;
100 info->device = pcm->device;
101 info->stream = substream->stream;
102 info->subdevice = substream->number;
103 strlcpy(info->id, pcm->id, sizeof(info->id));
104 strlcpy(info->name, pcm->name, sizeof(info->name));
105 info->dev_class = pcm->dev_class;
106 info->dev_subclass = pcm->dev_subclass;
107 info->subdevices_count = pstr->substream_count;
108 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
109 strlcpy(info->subname, substream->name, sizeof(info->subname));
110 runtime = substream->runtime;
111 /* AB: FIXME!!! This is definitely nonsense */
112 if (runtime) {
113 info->sync = runtime->sync;
114 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
115 }
116 return 0;
117 }
118
119 int snd_pcm_info_user(struct snd_pcm_substream *substream,
120 struct snd_pcm_info __user * _info)
121 {
122 struct snd_pcm_info *info;
123 int err;
124
125 info = kmalloc(sizeof(*info), GFP_KERNEL);
126 if (! info)
127 return -ENOMEM;
128 err = snd_pcm_info(substream, info);
129 if (err >= 0) {
130 if (copy_to_user(_info, info, sizeof(*info)))
131 err = -EFAULT;
132 }
133 kfree(info);
134 return err;
135 }
136
137 #undef RULES_DEBUG
138
139 #ifdef RULES_DEBUG
140 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
141 char *snd_pcm_hw_param_names[] = {
142 HW_PARAM(ACCESS),
143 HW_PARAM(FORMAT),
144 HW_PARAM(SUBFORMAT),
145 HW_PARAM(SAMPLE_BITS),
146 HW_PARAM(FRAME_BITS),
147 HW_PARAM(CHANNELS),
148 HW_PARAM(RATE),
149 HW_PARAM(PERIOD_TIME),
150 HW_PARAM(PERIOD_SIZE),
151 HW_PARAM(PERIOD_BYTES),
152 HW_PARAM(PERIODS),
153 HW_PARAM(BUFFER_TIME),
154 HW_PARAM(BUFFER_SIZE),
155 HW_PARAM(BUFFER_BYTES),
156 HW_PARAM(TICK_TIME),
157 };
158 #endif
159
160 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
161 struct snd_pcm_hw_params *params)
162 {
163 unsigned int k;
164 struct snd_pcm_hardware *hw;
165 struct snd_interval *i = NULL;
166 struct snd_mask *m = NULL;
167 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
168 unsigned int rstamps[constrs->rules_num];
169 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
170 unsigned int stamp = 2;
171 int changed, again;
172
173 params->info = 0;
174 params->fifo_size = 0;
175 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
176 params->msbits = 0;
177 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
178 params->rate_num = 0;
179 params->rate_den = 0;
180 }
181
182 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
183 m = hw_param_mask(params, k);
184 if (snd_mask_empty(m))
185 return -EINVAL;
186 if (!(params->rmask & (1 << k)))
187 continue;
188 #ifdef RULES_DEBUG
189 printk("%s = ", snd_pcm_hw_param_names[k]);
190 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
191 #endif
192 changed = snd_mask_refine(m, constrs_mask(constrs, k));
193 #ifdef RULES_DEBUG
194 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195 #endif
196 if (changed)
197 params->cmask |= 1 << k;
198 if (changed < 0)
199 return changed;
200 }
201
202 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
203 i = hw_param_interval(params, k);
204 if (snd_interval_empty(i))
205 return -EINVAL;
206 if (!(params->rmask & (1 << k)))
207 continue;
208 #ifdef RULES_DEBUG
209 printk("%s = ", snd_pcm_hw_param_names[k]);
210 if (i->empty)
211 printk("empty");
212 else
213 printk("%c%u %u%c",
214 i->openmin ? '(' : '[', i->min,
215 i->max, i->openmax ? ')' : ']');
216 printk(" -> ");
217 #endif
218 changed = snd_interval_refine(i, constrs_interval(constrs, k));
219 #ifdef RULES_DEBUG
220 if (i->empty)
221 printk("empty\n");
222 else
223 printk("%c%u %u%c\n",
224 i->openmin ? '(' : '[', i->min,
225 i->max, i->openmax ? ')' : ']');
226 #endif
227 if (changed)
228 params->cmask |= 1 << k;
229 if (changed < 0)
230 return changed;
231 }
232
233 for (k = 0; k < constrs->rules_num; k++)
234 rstamps[k] = 0;
235 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
236 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
237 do {
238 again = 0;
239 for (k = 0; k < constrs->rules_num; k++) {
240 struct snd_pcm_hw_rule *r = &constrs->rules[k];
241 unsigned int d;
242 int doit = 0;
243 if (r->cond && !(r->cond & params->flags))
244 continue;
245 for (d = 0; r->deps[d] >= 0; d++) {
246 if (vstamps[r->deps[d]] > rstamps[k]) {
247 doit = 1;
248 break;
249 }
250 }
251 if (!doit)
252 continue;
253 #ifdef RULES_DEBUG
254 printk("Rule %d [%p]: ", k, r->func);
255 if (r->var >= 0) {
256 printk("%s = ", snd_pcm_hw_param_names[r->var]);
257 if (hw_is_mask(r->var)) {
258 m = hw_param_mask(params, r->var);
259 printk("%x", *m->bits);
260 } else {
261 i = hw_param_interval(params, r->var);
262 if (i->empty)
263 printk("empty");
264 else
265 printk("%c%u %u%c",
266 i->openmin ? '(' : '[', i->min,
267 i->max, i->openmax ? ')' : ']');
268 }
269 }
270 #endif
271 changed = r->func(params, r);
272 #ifdef RULES_DEBUG
273 if (r->var >= 0) {
274 printk(" -> ");
275 if (hw_is_mask(r->var))
276 printk("%x", *m->bits);
277 else {
278 if (i->empty)
279 printk("empty");
280 else
281 printk("%c%u %u%c",
282 i->openmin ? '(' : '[', i->min,
283 i->max, i->openmax ? ')' : ']');
284 }
285 }
286 printk("\n");
287 #endif
288 rstamps[k] = stamp;
289 if (changed && r->var >= 0) {
290 params->cmask |= (1 << r->var);
291 vstamps[r->var] = stamp;
292 again = 1;
293 }
294 if (changed < 0)
295 return changed;
296 stamp++;
297 }
298 } while (again);
299 if (!params->msbits) {
300 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
301 if (snd_interval_single(i))
302 params->msbits = snd_interval_value(i);
303 }
304
305 if (!params->rate_den) {
306 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
307 if (snd_interval_single(i)) {
308 params->rate_num = snd_interval_value(i);
309 params->rate_den = 1;
310 }
311 }
312
313 hw = &substream->runtime->hw;
314 if (!params->info)
315 params->info = hw->info;
316 if (!params->fifo_size)
317 params->fifo_size = hw->fifo_size;
318 params->rmask = 0;
319 return 0;
320 }
321
322 EXPORT_SYMBOL(snd_pcm_hw_refine);
323
324 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
325 struct snd_pcm_hw_params __user * _params)
326 {
327 struct snd_pcm_hw_params *params;
328 int err;
329
330 params = kmalloc(sizeof(*params), GFP_KERNEL);
331 if (!params) {
332 err = -ENOMEM;
333 goto out;
334 }
335 if (copy_from_user(params, _params, sizeof(*params))) {
336 err = -EFAULT;
337 goto out;
338 }
339 err = snd_pcm_hw_refine(substream, params);
340 if (copy_to_user(_params, params, sizeof(*params))) {
341 if (!err)
342 err = -EFAULT;
343 }
344 out:
345 kfree(params);
346 return err;
347 }
348
349 static int period_to_usecs(struct snd_pcm_runtime *runtime)
350 {
351 int usecs;
352
353 if (! runtime->rate)
354 return -1; /* invalid */
355
356 /* take 75% of period time as the deadline */
357 usecs = (750000 / runtime->rate) * runtime->period_size;
358 usecs += ((750000 % runtime->rate) * runtime->period_size) /
359 runtime->rate;
360
361 return usecs;
362 }
363
364 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
365 struct snd_pcm_hw_params *params)
366 {
367 struct snd_pcm_runtime *runtime;
368 int err, usecs;
369 unsigned int bits;
370 snd_pcm_uframes_t frames;
371
372 snd_assert(substream != NULL, return -ENXIO);
373 runtime = substream->runtime;
374 snd_assert(runtime != NULL, return -ENXIO);
375 snd_pcm_stream_lock_irq(substream);
376 switch (runtime->status->state) {
377 case SNDRV_PCM_STATE_OPEN:
378 case SNDRV_PCM_STATE_SETUP:
379 case SNDRV_PCM_STATE_PREPARED:
380 break;
381 default:
382 snd_pcm_stream_unlock_irq(substream);
383 return -EBADFD;
384 }
385 snd_pcm_stream_unlock_irq(substream);
386 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
387 if (!substream->oss.oss)
388 #endif
389 if (atomic_read(&substream->mmap_count))
390 return -EBADFD;
391
392 params->rmask = ~0U;
393 err = snd_pcm_hw_refine(substream, params);
394 if (err < 0)
395 goto _error;
396
397 err = snd_pcm_hw_params_choose(substream, params);
398 if (err < 0)
399 goto _error;
400
401 if (substream->ops->hw_params != NULL) {
402 err = substream->ops->hw_params(substream, params);
403 if (err < 0)
404 goto _error;
405 }
406
407 runtime->access = params_access(params);
408 runtime->format = params_format(params);
409 runtime->subformat = params_subformat(params);
410 runtime->channels = params_channels(params);
411 runtime->rate = params_rate(params);
412 runtime->period_size = params_period_size(params);
413 runtime->periods = params_periods(params);
414 runtime->buffer_size = params_buffer_size(params);
415 runtime->info = params->info;
416 runtime->rate_num = params->rate_num;
417 runtime->rate_den = params->rate_den;
418
419 bits = snd_pcm_format_physical_width(runtime->format);
420 runtime->sample_bits = bits;
421 bits *= runtime->channels;
422 runtime->frame_bits = bits;
423 frames = 1;
424 while (bits % 8 != 0) {
425 bits *= 2;
426 frames *= 2;
427 }
428 runtime->byte_align = bits / 8;
429 runtime->min_align = frames;
430
431 /* Default sw params */
432 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
433 runtime->period_step = 1;
434 runtime->control->avail_min = runtime->period_size;
435 runtime->start_threshold = 1;
436 runtime->stop_threshold = runtime->buffer_size;
437 runtime->silence_threshold = 0;
438 runtime->silence_size = 0;
439 runtime->boundary = runtime->buffer_size;
440 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
441 runtime->boundary *= 2;
442
443 snd_pcm_timer_resolution_change(substream);
444 runtime->status->state = SNDRV_PCM_STATE_SETUP;
445
446 remove_acceptable_latency(substream->latency_id);
447 if ((usecs = period_to_usecs(runtime)) >= 0)
448 set_acceptable_latency(substream->latency_id, usecs);
449 return 0;
450 _error:
451 /* hardware might be unuseable from this time,
452 so we force application to retry to set
453 the correct hardware parameter settings */
454 runtime->status->state = SNDRV_PCM_STATE_OPEN;
455 if (substream->ops->hw_free != NULL)
456 substream->ops->hw_free(substream);
457 return err;
458 }
459
460 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
461 struct snd_pcm_hw_params __user * _params)
462 {
463 struct snd_pcm_hw_params *params;
464 int err;
465
466 params = kmalloc(sizeof(*params), GFP_KERNEL);
467 if (!params) {
468 err = -ENOMEM;
469 goto out;
470 }
471 if (copy_from_user(params, _params, sizeof(*params))) {
472 err = -EFAULT;
473 goto out;
474 }
475 err = snd_pcm_hw_params(substream, params);
476 if (copy_to_user(_params, params, sizeof(*params))) {
477 if (!err)
478 err = -EFAULT;
479 }
480 out:
481 kfree(params);
482 return err;
483 }
484
485 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
486 {
487 struct snd_pcm_runtime *runtime;
488 int result = 0;
489
490 snd_assert(substream != NULL, return -ENXIO);
491 runtime = substream->runtime;
492 snd_assert(runtime != NULL, return -ENXIO);
493 snd_pcm_stream_lock_irq(substream);
494 switch (runtime->status->state) {
495 case SNDRV_PCM_STATE_SETUP:
496 case SNDRV_PCM_STATE_PREPARED:
497 break;
498 default:
499 snd_pcm_stream_unlock_irq(substream);
500 return -EBADFD;
501 }
502 snd_pcm_stream_unlock_irq(substream);
503 if (atomic_read(&substream->mmap_count))
504 return -EBADFD;
505 if (substream->ops->hw_free)
506 result = substream->ops->hw_free(substream);
507 runtime->status->state = SNDRV_PCM_STATE_OPEN;
508 remove_acceptable_latency(substream->latency_id);
509 return result;
510 }
511
512 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
513 struct snd_pcm_sw_params *params)
514 {
515 struct snd_pcm_runtime *runtime;
516
517 snd_assert(substream != NULL, return -ENXIO);
518 runtime = substream->runtime;
519 snd_assert(runtime != NULL, return -ENXIO);
520 snd_pcm_stream_lock_irq(substream);
521 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
522 snd_pcm_stream_unlock_irq(substream);
523 return -EBADFD;
524 }
525 snd_pcm_stream_unlock_irq(substream);
526
527 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
528 return -EINVAL;
529 if (params->avail_min == 0)
530 return -EINVAL;
531 if (params->silence_size >= runtime->boundary) {
532 if (params->silence_threshold != 0)
533 return -EINVAL;
534 } else {
535 if (params->silence_size > params->silence_threshold)
536 return -EINVAL;
537 if (params->silence_threshold > runtime->buffer_size)
538 return -EINVAL;
539 }
540 snd_pcm_stream_lock_irq(substream);
541 runtime->tstamp_mode = params->tstamp_mode;
542 runtime->period_step = params->period_step;
543 runtime->control->avail_min = params->avail_min;
544 runtime->start_threshold = params->start_threshold;
545 runtime->stop_threshold = params->stop_threshold;
546 runtime->silence_threshold = params->silence_threshold;
547 runtime->silence_size = params->silence_size;
548 params->boundary = runtime->boundary;
549 if (snd_pcm_running(substream)) {
550 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
551 runtime->silence_size > 0)
552 snd_pcm_playback_silence(substream, ULONG_MAX);
553 wake_up(&runtime->sleep);
554 }
555 snd_pcm_stream_unlock_irq(substream);
556 return 0;
557 }
558
559 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
560 struct snd_pcm_sw_params __user * _params)
561 {
562 struct snd_pcm_sw_params params;
563 int err;
564 if (copy_from_user(&params, _params, sizeof(params)))
565 return -EFAULT;
566 err = snd_pcm_sw_params(substream, &params);
567 if (copy_to_user(_params, &params, sizeof(params)))
568 return -EFAULT;
569 return err;
570 }
571
572 int snd_pcm_status(struct snd_pcm_substream *substream,
573 struct snd_pcm_status *status)
574 {
575 struct snd_pcm_runtime *runtime = substream->runtime;
576
577 snd_pcm_stream_lock_irq(substream);
578 status->state = runtime->status->state;
579 status->suspended_state = runtime->status->suspended_state;
580 if (status->state == SNDRV_PCM_STATE_OPEN)
581 goto _end;
582 status->trigger_tstamp = runtime->trigger_tstamp;
583 if (snd_pcm_running(substream)) {
584 snd_pcm_update_hw_ptr(substream);
585 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
586 status->tstamp = runtime->status->tstamp;
587 goto _tstamp_end;
588 }
589 }
590 snd_pcm_gettime(runtime, &status->tstamp);
591 _tstamp_end:
592 status->appl_ptr = runtime->control->appl_ptr;
593 status->hw_ptr = runtime->status->hw_ptr;
594 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
595 status->avail = snd_pcm_playback_avail(runtime);
596 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
597 runtime->status->state == SNDRV_PCM_STATE_DRAINING)
598 status->delay = runtime->buffer_size - status->avail;
599 else
600 status->delay = 0;
601 } else {
602 status->avail = snd_pcm_capture_avail(runtime);
603 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
604 status->delay = status->avail;
605 else
606 status->delay = 0;
607 }
608 status->avail_max = runtime->avail_max;
609 status->overrange = runtime->overrange;
610 runtime->avail_max = 0;
611 runtime->overrange = 0;
612 _end:
613 snd_pcm_stream_unlock_irq(substream);
614 return 0;
615 }
616
617 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
618 struct snd_pcm_status __user * _status)
619 {
620 struct snd_pcm_status status;
621 struct snd_pcm_runtime *runtime;
622 int res;
623
624 snd_assert(substream != NULL, return -ENXIO);
625 runtime = substream->runtime;
626 memset(&status, 0, sizeof(status));
627 res = snd_pcm_status(substream, &status);
628 if (res < 0)
629 return res;
630 if (copy_to_user(_status, &status, sizeof(status)))
631 return -EFAULT;
632 return 0;
633 }
634
635 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
636 struct snd_pcm_channel_info * info)
637 {
638 struct snd_pcm_runtime *runtime;
639 unsigned int channel;
640
641 snd_assert(substream != NULL, return -ENXIO);
642 channel = info->channel;
643 runtime = substream->runtime;
644 snd_pcm_stream_lock_irq(substream);
645 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
646 snd_pcm_stream_unlock_irq(substream);
647 return -EBADFD;
648 }
649 snd_pcm_stream_unlock_irq(substream);
650 if (channel >= runtime->channels)
651 return -EINVAL;
652 memset(info, 0, sizeof(*info));
653 info->channel = channel;
654 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
655 }
656
657 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
658 struct snd_pcm_channel_info __user * _info)
659 {
660 struct snd_pcm_channel_info info;
661 int res;
662
663 if (copy_from_user(&info, _info, sizeof(info)))
664 return -EFAULT;
665 res = snd_pcm_channel_info(substream, &info);
666 if (res < 0)
667 return res;
668 if (copy_to_user(_info, &info, sizeof(info)))
669 return -EFAULT;
670 return 0;
671 }
672
673 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
674 {
675 struct snd_pcm_runtime *runtime = substream->runtime;
676 if (runtime->trigger_master == NULL)
677 return;
678 if (runtime->trigger_master == substream) {
679 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
680 } else {
681 snd_pcm_trigger_tstamp(runtime->trigger_master);
682 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
683 }
684 runtime->trigger_master = NULL;
685 }
686
687 struct action_ops {
688 int (*pre_action)(struct snd_pcm_substream *substream, int state);
689 int (*do_action)(struct snd_pcm_substream *substream, int state);
690 void (*undo_action)(struct snd_pcm_substream *substream, int state);
691 void (*post_action)(struct snd_pcm_substream *substream, int state);
692 };
693
694 /*
695 * this functions is core for handling of linked stream
696 * Note: the stream state might be changed also on failure
697 * Note2: call with calling stream lock + link lock
698 */
699 static int snd_pcm_action_group(struct action_ops *ops,
700 struct snd_pcm_substream *substream,
701 int state, int do_lock)
702 {
703 struct snd_pcm_substream *s = NULL;
704 struct snd_pcm_substream *s1;
705 int res = 0;
706
707 snd_pcm_group_for_each_entry(s, substream) {
708 if (do_lock && s != substream)
709 spin_lock_nested(&s->self_group.lock,
710 SINGLE_DEPTH_NESTING);
711 res = ops->pre_action(s, state);
712 if (res < 0)
713 goto _unlock;
714 }
715 snd_pcm_group_for_each_entry(s, substream) {
716 res = ops->do_action(s, state);
717 if (res < 0) {
718 if (ops->undo_action) {
719 snd_pcm_group_for_each_entry(s1, substream) {
720 if (s1 == s) /* failed stream */
721 break;
722 ops->undo_action(s1, state);
723 }
724 }
725 s = NULL; /* unlock all */
726 goto _unlock;
727 }
728 }
729 snd_pcm_group_for_each_entry(s, substream) {
730 ops->post_action(s, state);
731 }
732 _unlock:
733 if (do_lock) {
734 /* unlock streams */
735 snd_pcm_group_for_each_entry(s1, substream) {
736 if (s1 != substream)
737 spin_unlock(&s1->self_group.lock);
738 if (s1 == s) /* end */
739 break;
740 }
741 }
742 return res;
743 }
744
745 /*
746 * Note: call with stream lock
747 */
748 static int snd_pcm_action_single(struct action_ops *ops,
749 struct snd_pcm_substream *substream,
750 int state)
751 {
752 int res;
753
754 res = ops->pre_action(substream, state);
755 if (res < 0)
756 return res;
757 res = ops->do_action(substream, state);
758 if (res == 0)
759 ops->post_action(substream, state);
760 else if (ops->undo_action)
761 ops->undo_action(substream, state);
762 return res;
763 }
764
765 /*
766 * Note: call with stream lock
767 */
768 static int snd_pcm_action(struct action_ops *ops,
769 struct snd_pcm_substream *substream,
770 int state)
771 {
772 int res;
773
774 if (snd_pcm_stream_linked(substream)) {
775 if (!spin_trylock(&substream->group->lock)) {
776 spin_unlock(&substream->self_group.lock);
777 spin_lock(&substream->group->lock);
778 spin_lock(&substream->self_group.lock);
779 }
780 res = snd_pcm_action_group(ops, substream, state, 1);
781 spin_unlock(&substream->group->lock);
782 } else {
783 res = snd_pcm_action_single(ops, substream, state);
784 }
785 return res;
786 }
787
788 /*
789 * Note: don't use any locks before
790 */
791 static int snd_pcm_action_lock_irq(struct action_ops *ops,
792 struct snd_pcm_substream *substream,
793 int state)
794 {
795 int res;
796
797 read_lock_irq(&snd_pcm_link_rwlock);
798 if (snd_pcm_stream_linked(substream)) {
799 spin_lock(&substream->group->lock);
800 spin_lock(&substream->self_group.lock);
801 res = snd_pcm_action_group(ops, substream, state, 1);
802 spin_unlock(&substream->self_group.lock);
803 spin_unlock(&substream->group->lock);
804 } else {
805 spin_lock(&substream->self_group.lock);
806 res = snd_pcm_action_single(ops, substream, state);
807 spin_unlock(&substream->self_group.lock);
808 }
809 read_unlock_irq(&snd_pcm_link_rwlock);
810 return res;
811 }
812
813 /*
814 */
815 static int snd_pcm_action_nonatomic(struct action_ops *ops,
816 struct snd_pcm_substream *substream,
817 int state)
818 {
819 int res;
820
821 down_read(&snd_pcm_link_rwsem);
822 if (snd_pcm_stream_linked(substream))
823 res = snd_pcm_action_group(ops, substream, state, 0);
824 else
825 res = snd_pcm_action_single(ops, substream, state);
826 up_read(&snd_pcm_link_rwsem);
827 return res;
828 }
829
830 /*
831 * start callbacks
832 */
833 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
834 {
835 struct snd_pcm_runtime *runtime = substream->runtime;
836 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
837 return -EBADFD;
838 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
839 !snd_pcm_playback_data(substream))
840 return -EPIPE;
841 runtime->trigger_master = substream;
842 return 0;
843 }
844
845 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
846 {
847 if (substream->runtime->trigger_master != substream)
848 return 0;
849 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
850 }
851
852 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
853 {
854 if (substream->runtime->trigger_master == substream)
855 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
856 }
857
858 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
859 {
860 struct snd_pcm_runtime *runtime = substream->runtime;
861 snd_pcm_trigger_tstamp(substream);
862 runtime->status->state = state;
863 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
864 runtime->silence_size > 0)
865 snd_pcm_playback_silence(substream, ULONG_MAX);
866 if (substream->timer)
867 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
868 &runtime->trigger_tstamp);
869 }
870
871 static struct action_ops snd_pcm_action_start = {
872 .pre_action = snd_pcm_pre_start,
873 .do_action = snd_pcm_do_start,
874 .undo_action = snd_pcm_undo_start,
875 .post_action = snd_pcm_post_start
876 };
877
878 /**
879 * snd_pcm_start
880 * @substream: the PCM substream instance
881 *
882 * Start all linked streams.
883 */
884 int snd_pcm_start(struct snd_pcm_substream *substream)
885 {
886 return snd_pcm_action(&snd_pcm_action_start, substream,
887 SNDRV_PCM_STATE_RUNNING);
888 }
889
890 /*
891 * stop callbacks
892 */
893 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
894 {
895 struct snd_pcm_runtime *runtime = substream->runtime;
896 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
897 return -EBADFD;
898 runtime->trigger_master = substream;
899 return 0;
900 }
901
902 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
903 {
904 if (substream->runtime->trigger_master == substream &&
905 snd_pcm_running(substream))
906 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
907 return 0; /* unconditonally stop all substreams */
908 }
909
910 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
911 {
912 struct snd_pcm_runtime *runtime = substream->runtime;
913 if (runtime->status->state != state) {
914 snd_pcm_trigger_tstamp(substream);
915 if (substream->timer)
916 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
917 &runtime->trigger_tstamp);
918 runtime->status->state = state;
919 }
920 wake_up(&runtime->sleep);
921 }
922
923 static struct action_ops snd_pcm_action_stop = {
924 .pre_action = snd_pcm_pre_stop,
925 .do_action = snd_pcm_do_stop,
926 .post_action = snd_pcm_post_stop
927 };
928
929 /**
930 * snd_pcm_stop
931 * @substream: the PCM substream instance
932 * @state: PCM state after stopping the stream
933 *
934 * Try to stop all running streams in the substream group.
935 * The state of each stream is changed to the given value after that unconditionally.
936 */
937 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
938 {
939 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
940 }
941
942 EXPORT_SYMBOL(snd_pcm_stop);
943
944 /**
945 * snd_pcm_drain_done
946 * @substream: the PCM substream
947 *
948 * Stop the DMA only when the given stream is playback.
949 * The state is changed to SETUP.
950 * Unlike snd_pcm_stop(), this affects only the given stream.
951 */
952 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
953 {
954 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
955 SNDRV_PCM_STATE_SETUP);
956 }
957
958 /*
959 * pause callbacks
960 */
961 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
962 {
963 struct snd_pcm_runtime *runtime = substream->runtime;
964 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
965 return -ENOSYS;
966 if (push) {
967 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
968 return -EBADFD;
969 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
970 return -EBADFD;
971 runtime->trigger_master = substream;
972 return 0;
973 }
974
975 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
976 {
977 if (substream->runtime->trigger_master != substream)
978 return 0;
979 return substream->ops->trigger(substream,
980 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
981 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
982 }
983
984 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
985 {
986 if (substream->runtime->trigger_master == substream)
987 substream->ops->trigger(substream,
988 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
989 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
990 }
991
992 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
993 {
994 struct snd_pcm_runtime *runtime = substream->runtime;
995 snd_pcm_trigger_tstamp(substream);
996 if (push) {
997 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
998 if (substream->timer)
999 snd_timer_notify(substream->timer,
1000 SNDRV_TIMER_EVENT_MPAUSE,
1001 &runtime->trigger_tstamp);
1002 wake_up(&runtime->sleep);
1003 } else {
1004 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1005 if (substream->timer)
1006 snd_timer_notify(substream->timer,
1007 SNDRV_TIMER_EVENT_MCONTINUE,
1008 &runtime->trigger_tstamp);
1009 }
1010 }
1011
1012 static struct action_ops snd_pcm_action_pause = {
1013 .pre_action = snd_pcm_pre_pause,
1014 .do_action = snd_pcm_do_pause,
1015 .undo_action = snd_pcm_undo_pause,
1016 .post_action = snd_pcm_post_pause
1017 };
1018
1019 /*
1020 * Push/release the pause for all linked streams.
1021 */
1022 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1023 {
1024 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1025 }
1026
1027 #ifdef CONFIG_PM
1028 /* suspend */
1029
1030 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1031 {
1032 struct snd_pcm_runtime *runtime = substream->runtime;
1033 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1034 return -EBUSY;
1035 runtime->trigger_master = substream;
1036 return 0;
1037 }
1038
1039 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1040 {
1041 struct snd_pcm_runtime *runtime = substream->runtime;
1042 if (runtime->trigger_master != substream)
1043 return 0;
1044 if (! snd_pcm_running(substream))
1045 return 0;
1046 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1047 return 0; /* suspend unconditionally */
1048 }
1049
1050 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1051 {
1052 struct snd_pcm_runtime *runtime = substream->runtime;
1053 snd_pcm_trigger_tstamp(substream);
1054 if (substream->timer)
1055 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1056 &runtime->trigger_tstamp);
1057 runtime->status->suspended_state = runtime->status->state;
1058 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1059 wake_up(&runtime->sleep);
1060 }
1061
1062 static struct action_ops snd_pcm_action_suspend = {
1063 .pre_action = snd_pcm_pre_suspend,
1064 .do_action = snd_pcm_do_suspend,
1065 .post_action = snd_pcm_post_suspend
1066 };
1067
1068 /**
1069 * snd_pcm_suspend
1070 * @substream: the PCM substream
1071 *
1072 * Trigger SUSPEND to all linked streams.
1073 * After this call, all streams are changed to SUSPENDED state.
1074 */
1075 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1076 {
1077 int err;
1078 unsigned long flags;
1079
1080 if (! substream)
1081 return 0;
1082
1083 snd_pcm_stream_lock_irqsave(substream, flags);
1084 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1085 snd_pcm_stream_unlock_irqrestore(substream, flags);
1086 return err;
1087 }
1088
1089 EXPORT_SYMBOL(snd_pcm_suspend);
1090
1091 /**
1092 * snd_pcm_suspend_all
1093 * @pcm: the PCM instance
1094 *
1095 * Trigger SUSPEND to all substreams in the given pcm.
1096 * After this call, all streams are changed to SUSPENDED state.
1097 */
1098 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1099 {
1100 struct snd_pcm_substream *substream;
1101 int stream, err = 0;
1102
1103 if (! pcm)
1104 return 0;
1105
1106 for (stream = 0; stream < 2; stream++) {
1107 for (substream = pcm->streams[stream].substream;
1108 substream; substream = substream->next) {
1109 /* FIXME: the open/close code should lock this as well */
1110 if (substream->runtime == NULL)
1111 continue;
1112 err = snd_pcm_suspend(substream);
1113 if (err < 0 && err != -EBUSY)
1114 return err;
1115 }
1116 }
1117 return 0;
1118 }
1119
1120 EXPORT_SYMBOL(snd_pcm_suspend_all);
1121
1122 /* resume */
1123
1124 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1125 {
1126 struct snd_pcm_runtime *runtime = substream->runtime;
1127 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1128 return -ENOSYS;
1129 runtime->trigger_master = substream;
1130 return 0;
1131 }
1132
1133 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1134 {
1135 struct snd_pcm_runtime *runtime = substream->runtime;
1136 if (runtime->trigger_master != substream)
1137 return 0;
1138 /* DMA not running previously? */
1139 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1140 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1141 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1142 return 0;
1143 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1144 }
1145
1146 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1147 {
1148 if (substream->runtime->trigger_master == substream &&
1149 snd_pcm_running(substream))
1150 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1151 }
1152
1153 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1154 {
1155 struct snd_pcm_runtime *runtime = substream->runtime;
1156 snd_pcm_trigger_tstamp(substream);
1157 if (substream->timer)
1158 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1159 &runtime->trigger_tstamp);
1160 runtime->status->state = runtime->status->suspended_state;
1161 }
1162
1163 static struct action_ops snd_pcm_action_resume = {
1164 .pre_action = snd_pcm_pre_resume,
1165 .do_action = snd_pcm_do_resume,
1166 .undo_action = snd_pcm_undo_resume,
1167 .post_action = snd_pcm_post_resume
1168 };
1169
1170 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1171 {
1172 struct snd_card *card = substream->pcm->card;
1173 int res;
1174
1175 snd_power_lock(card);
1176 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1177 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1178 snd_power_unlock(card);
1179 return res;
1180 }
1181
1182 #else
1183
1184 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1185 {
1186 return -ENOSYS;
1187 }
1188
1189 #endif /* CONFIG_PM */
1190
1191 /*
1192 * xrun ioctl
1193 *
1194 * Change the RUNNING stream(s) to XRUN state.
1195 */
1196 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1197 {
1198 struct snd_card *card = substream->pcm->card;
1199 struct snd_pcm_runtime *runtime = substream->runtime;
1200 int result;
1201
1202 snd_power_lock(card);
1203 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1204 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1205 if (result < 0)
1206 goto _unlock;
1207 }
1208
1209 snd_pcm_stream_lock_irq(substream);
1210 switch (runtime->status->state) {
1211 case SNDRV_PCM_STATE_XRUN:
1212 result = 0; /* already there */
1213 break;
1214 case SNDRV_PCM_STATE_RUNNING:
1215 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1216 break;
1217 default:
1218 result = -EBADFD;
1219 }
1220 snd_pcm_stream_unlock_irq(substream);
1221 _unlock:
1222 snd_power_unlock(card);
1223 return result;
1224 }
1225
1226 /*
1227 * reset ioctl
1228 */
1229 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1230 {
1231 struct snd_pcm_runtime *runtime = substream->runtime;
1232 switch (runtime->status->state) {
1233 case SNDRV_PCM_STATE_RUNNING:
1234 case SNDRV_PCM_STATE_PREPARED:
1235 case SNDRV_PCM_STATE_PAUSED:
1236 case SNDRV_PCM_STATE_SUSPENDED:
1237 return 0;
1238 default:
1239 return -EBADFD;
1240 }
1241 }
1242
1243 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1244 {
1245 struct snd_pcm_runtime *runtime = substream->runtime;
1246 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1247 if (err < 0)
1248 return err;
1249 // snd_assert(runtime->status->hw_ptr < runtime->buffer_size, );
1250 runtime->hw_ptr_base = 0;
1251 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1252 runtime->status->hw_ptr % runtime->period_size;
1253 runtime->silence_start = runtime->status->hw_ptr;
1254 runtime->silence_filled = 0;
1255 return 0;
1256 }
1257
1258 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1259 {
1260 struct snd_pcm_runtime *runtime = substream->runtime;
1261 runtime->control->appl_ptr = runtime->status->hw_ptr;
1262 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1263 runtime->silence_size > 0)
1264 snd_pcm_playback_silence(substream, ULONG_MAX);
1265 }
1266
1267 static struct action_ops snd_pcm_action_reset = {
1268 .pre_action = snd_pcm_pre_reset,
1269 .do_action = snd_pcm_do_reset,
1270 .post_action = snd_pcm_post_reset
1271 };
1272
1273 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1274 {
1275 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1276 }
1277
1278 /*
1279 * prepare ioctl
1280 */
1281 /* we use the second argument for updating f_flags */
1282 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1283 int f_flags)
1284 {
1285 struct snd_pcm_runtime *runtime = substream->runtime;
1286 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1287 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1288 return -EBADFD;
1289 if (snd_pcm_running(substream))
1290 return -EBUSY;
1291 substream->f_flags = f_flags;
1292 return 0;
1293 }
1294
1295 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1296 {
1297 int err;
1298 err = substream->ops->prepare(substream);
1299 if (err < 0)
1300 return err;
1301 return snd_pcm_do_reset(substream, 0);
1302 }
1303
1304 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1305 {
1306 struct snd_pcm_runtime *runtime = substream->runtime;
1307 runtime->control->appl_ptr = runtime->status->hw_ptr;
1308 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1309 }
1310
1311 static struct action_ops snd_pcm_action_prepare = {
1312 .pre_action = snd_pcm_pre_prepare,
1313 .do_action = snd_pcm_do_prepare,
1314 .post_action = snd_pcm_post_prepare
1315 };
1316
1317 /**
1318 * snd_pcm_prepare
1319 * @substream: the PCM substream instance
1320 * @file: file to refer f_flags
1321 *
1322 * Prepare the PCM substream to be triggerable.
1323 */
1324 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1325 struct file *file)
1326 {
1327 int res;
1328 struct snd_card *card = substream->pcm->card;
1329 int f_flags;
1330
1331 if (file)
1332 f_flags = file->f_flags;
1333 else
1334 f_flags = substream->f_flags;
1335
1336 snd_power_lock(card);
1337 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1338 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1339 substream, f_flags);
1340 snd_power_unlock(card);
1341 return res;
1342 }
1343
1344 /*
1345 * drain ioctl
1346 */
1347
1348 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1349 {
1350 if (substream->f_flags & O_NONBLOCK)
1351 return -EAGAIN;
1352 substream->runtime->trigger_master = substream;
1353 return 0;
1354 }
1355
1356 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1357 {
1358 struct snd_pcm_runtime *runtime = substream->runtime;
1359 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1360 switch (runtime->status->state) {
1361 case SNDRV_PCM_STATE_PREPARED:
1362 /* start playback stream if possible */
1363 if (! snd_pcm_playback_empty(substream)) {
1364 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1365 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1366 }
1367 break;
1368 case SNDRV_PCM_STATE_RUNNING:
1369 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1370 break;
1371 default:
1372 break;
1373 }
1374 } else {
1375 /* stop running stream */
1376 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1377 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1378 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1379 snd_pcm_do_stop(substream, new_state);
1380 snd_pcm_post_stop(substream, new_state);
1381 }
1382 }
1383 return 0;
1384 }
1385
1386 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1387 {
1388 }
1389
1390 static struct action_ops snd_pcm_action_drain_init = {
1391 .pre_action = snd_pcm_pre_drain_init,
1392 .do_action = snd_pcm_do_drain_init,
1393 .post_action = snd_pcm_post_drain_init
1394 };
1395
1396 struct drain_rec {
1397 struct snd_pcm_substream *substream;
1398 wait_queue_t wait;
1399 snd_pcm_uframes_t stop_threshold;
1400 };
1401
1402 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1403
1404 /*
1405 * Drain the stream(s).
1406 * When the substream is linked, sync until the draining of all playback streams
1407 * is finished.
1408 * After this call, all streams are supposed to be either SETUP or DRAINING
1409 * (capture only) state.
1410 */
1411 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1412 {
1413 struct snd_card *card;
1414 struct snd_pcm_runtime *runtime;
1415 struct snd_pcm_substream *s;
1416 int result = 0;
1417 int i, num_drecs;
1418 struct drain_rec *drec, drec_tmp, *d;
1419
1420 snd_assert(substream != NULL, return -ENXIO);
1421 card = substream->pcm->card;
1422 runtime = substream->runtime;
1423
1424 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1425 return -EBADFD;
1426
1427 snd_power_lock(card);
1428 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1429 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1430 if (result < 0) {
1431 snd_power_unlock(card);
1432 return result;
1433 }
1434 }
1435
1436 /* allocate temporary record for drain sync */
1437 down_read(&snd_pcm_link_rwsem);
1438 if (snd_pcm_stream_linked(substream)) {
1439 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1440 if (! drec) {
1441 up_read(&snd_pcm_link_rwsem);
1442 snd_power_unlock(card);
1443 return -ENOMEM;
1444 }
1445 } else
1446 drec = &drec_tmp;
1447
1448 /* count only playback streams */
1449 num_drecs = 0;
1450 snd_pcm_group_for_each_entry(s, substream) {
1451 runtime = s->runtime;
1452 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1453 d = &drec[num_drecs++];
1454 d->substream = s;
1455 init_waitqueue_entry(&d->wait, current);
1456 add_wait_queue(&runtime->sleep, &d->wait);
1457 /* stop_threshold fixup to avoid endless loop when
1458 * stop_threshold > buffer_size
1459 */
1460 d->stop_threshold = runtime->stop_threshold;
1461 if (runtime->stop_threshold > runtime->buffer_size)
1462 runtime->stop_threshold = runtime->buffer_size;
1463 }
1464 }
1465 up_read(&snd_pcm_link_rwsem);
1466
1467 snd_pcm_stream_lock_irq(substream);
1468 /* resume pause */
1469 if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1470 snd_pcm_pause(substream, 0);
1471
1472 /* pre-start/stop - all running streams are changed to DRAINING state */
1473 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1474 if (result < 0) {
1475 snd_pcm_stream_unlock_irq(substream);
1476 goto _error;
1477 }
1478
1479 for (;;) {
1480 long tout;
1481 if (signal_pending(current)) {
1482 result = -ERESTARTSYS;
1483 break;
1484 }
1485 /* all finished? */
1486 for (i = 0; i < num_drecs; i++) {
1487 runtime = drec[i].substream->runtime;
1488 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1489 break;
1490 }
1491 if (i == num_drecs)
1492 break; /* yes, all drained */
1493
1494 set_current_state(TASK_INTERRUPTIBLE);
1495 snd_pcm_stream_unlock_irq(substream);
1496 snd_power_unlock(card);
1497 tout = schedule_timeout(10 * HZ);
1498 snd_power_lock(card);
1499 snd_pcm_stream_lock_irq(substream);
1500 if (tout == 0) {
1501 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1502 result = -ESTRPIPE;
1503 else {
1504 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1505 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1506 result = -EIO;
1507 }
1508 break;
1509 }
1510 }
1511
1512 snd_pcm_stream_unlock_irq(substream);
1513
1514 _error:
1515 for (i = 0; i < num_drecs; i++) {
1516 d = &drec[i];
1517 runtime = d->substream->runtime;
1518 remove_wait_queue(&runtime->sleep, &d->wait);
1519 runtime->stop_threshold = d->stop_threshold;
1520 }
1521
1522 if (drec != &drec_tmp)
1523 kfree(drec);
1524 snd_power_unlock(card);
1525
1526 return result;
1527 }
1528
1529 /*
1530 * drop ioctl
1531 *
1532 * Immediately put all linked substreams into SETUP state.
1533 */
1534 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1535 {
1536 struct snd_pcm_runtime *runtime;
1537 struct snd_card *card;
1538 int result = 0;
1539
1540 snd_assert(substream != NULL, return -ENXIO);
1541 runtime = substream->runtime;
1542 card = substream->pcm->card;
1543
1544 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1545 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1546 return -EBADFD;
1547
1548 snd_power_lock(card);
1549 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1550 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1551 if (result < 0)
1552 goto _unlock;
1553 }
1554
1555 snd_pcm_stream_lock_irq(substream);
1556 /* resume pause */
1557 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1558 snd_pcm_pause(substream, 0);
1559
1560 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1561 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1562 snd_pcm_stream_unlock_irq(substream);
1563 _unlock:
1564 snd_power_unlock(card);
1565 return result;
1566 }
1567
1568
1569 /* WARNING: Don't forget to fput back the file */
1570 static struct file *snd_pcm_file_fd(int fd)
1571 {
1572 struct file *file;
1573 struct inode *inode;
1574 unsigned int minor;
1575
1576 file = fget(fd);
1577 if (!file)
1578 return NULL;
1579 inode = file->f_path.dentry->d_inode;
1580 if (!S_ISCHR(inode->i_mode) ||
1581 imajor(inode) != snd_major) {
1582 fput(file);
1583 return NULL;
1584 }
1585 minor = iminor(inode);
1586 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1587 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1588 fput(file);
1589 return NULL;
1590 }
1591 return file;
1592 }
1593
1594 /*
1595 * PCM link handling
1596 */
1597 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1598 {
1599 int res = 0;
1600 struct file *file;
1601 struct snd_pcm_file *pcm_file;
1602 struct snd_pcm_substream *substream1;
1603
1604 file = snd_pcm_file_fd(fd);
1605 if (!file)
1606 return -EBADFD;
1607 pcm_file = file->private_data;
1608 substream1 = pcm_file->substream;
1609 down_write(&snd_pcm_link_rwsem);
1610 write_lock_irq(&snd_pcm_link_rwlock);
1611 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1612 substream->runtime->status->state != substream1->runtime->status->state) {
1613 res = -EBADFD;
1614 goto _end;
1615 }
1616 if (snd_pcm_stream_linked(substream1)) {
1617 res = -EALREADY;
1618 goto _end;
1619 }
1620 if (!snd_pcm_stream_linked(substream)) {
1621 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1622 if (substream->group == NULL) {
1623 res = -ENOMEM;
1624 goto _end;
1625 }
1626 spin_lock_init(&substream->group->lock);
1627 INIT_LIST_HEAD(&substream->group->substreams);
1628 list_add_tail(&substream->link_list, &substream->group->substreams);
1629 substream->group->count = 1;
1630 }
1631 list_add_tail(&substream1->link_list, &substream->group->substreams);
1632 substream->group->count++;
1633 substream1->group = substream->group;
1634 _end:
1635 write_unlock_irq(&snd_pcm_link_rwlock);
1636 up_write(&snd_pcm_link_rwsem);
1637 fput(file);
1638 return res;
1639 }
1640
1641 static void relink_to_local(struct snd_pcm_substream *substream)
1642 {
1643 substream->group = &substream->self_group;
1644 INIT_LIST_HEAD(&substream->self_group.substreams);
1645 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1646 }
1647
1648 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1649 {
1650 struct snd_pcm_substream *s;
1651 int res = 0;
1652
1653 down_write(&snd_pcm_link_rwsem);
1654 write_lock_irq(&snd_pcm_link_rwlock);
1655 if (!snd_pcm_stream_linked(substream)) {
1656 res = -EALREADY;
1657 goto _end;
1658 }
1659 list_del(&substream->link_list);
1660 substream->group->count--;
1661 if (substream->group->count == 1) { /* detach the last stream, too */
1662 snd_pcm_group_for_each_entry(s, substream) {
1663 relink_to_local(s);
1664 break;
1665 }
1666 kfree(substream->group);
1667 }
1668 relink_to_local(substream);
1669 _end:
1670 write_unlock_irq(&snd_pcm_link_rwlock);
1671 up_write(&snd_pcm_link_rwsem);
1672 return res;
1673 }
1674
1675 /*
1676 * hw configurator
1677 */
1678 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1679 struct snd_pcm_hw_rule *rule)
1680 {
1681 struct snd_interval t;
1682 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1683 hw_param_interval_c(params, rule->deps[1]), &t);
1684 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1685 }
1686
1687 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1688 struct snd_pcm_hw_rule *rule)
1689 {
1690 struct snd_interval t;
1691 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1692 hw_param_interval_c(params, rule->deps[1]), &t);
1693 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1694 }
1695
1696 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1697 struct snd_pcm_hw_rule *rule)
1698 {
1699 struct snd_interval t;
1700 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1701 hw_param_interval_c(params, rule->deps[1]),
1702 (unsigned long) rule->private, &t);
1703 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1704 }
1705
1706 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1707 struct snd_pcm_hw_rule *rule)
1708 {
1709 struct snd_interval t;
1710 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1711 (unsigned long) rule->private,
1712 hw_param_interval_c(params, rule->deps[1]), &t);
1713 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1714 }
1715
1716 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1717 struct snd_pcm_hw_rule *rule)
1718 {
1719 unsigned int k;
1720 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1721 struct snd_mask m;
1722 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1723 snd_mask_any(&m);
1724 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1725 int bits;
1726 if (! snd_mask_test(mask, k))
1727 continue;
1728 bits = snd_pcm_format_physical_width(k);
1729 if (bits <= 0)
1730 continue; /* ignore invalid formats */
1731 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1732 snd_mask_reset(&m, k);
1733 }
1734 return snd_mask_refine(mask, &m);
1735 }
1736
1737 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1738 struct snd_pcm_hw_rule *rule)
1739 {
1740 struct snd_interval t;
1741 unsigned int k;
1742 t.min = UINT_MAX;
1743 t.max = 0;
1744 t.openmin = 0;
1745 t.openmax = 0;
1746 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1747 int bits;
1748 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1749 continue;
1750 bits = snd_pcm_format_physical_width(k);
1751 if (bits <= 0)
1752 continue; /* ignore invalid formats */
1753 if (t.min > (unsigned)bits)
1754 t.min = bits;
1755 if (t.max < (unsigned)bits)
1756 t.max = bits;
1757 }
1758 t.integer = 1;
1759 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1760 }
1761
1762 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1763 #error "Change this table"
1764 #endif
1765
1766 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1767 48000, 64000, 88200, 96000, 176400, 192000 };
1768
1769 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1770 .count = ARRAY_SIZE(rates),
1771 .list = rates,
1772 };
1773
1774 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1775 struct snd_pcm_hw_rule *rule)
1776 {
1777 struct snd_pcm_hardware *hw = rule->private;
1778 return snd_interval_list(hw_param_interval(params, rule->var),
1779 snd_pcm_known_rates.count,
1780 snd_pcm_known_rates.list, hw->rates);
1781 }
1782
1783 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1784 struct snd_pcm_hw_rule *rule)
1785 {
1786 struct snd_interval t;
1787 struct snd_pcm_substream *substream = rule->private;
1788 t.min = 0;
1789 t.max = substream->buffer_bytes_max;
1790 t.openmin = 0;
1791 t.openmax = 0;
1792 t.integer = 1;
1793 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1794 }
1795
1796 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1797 {
1798 struct snd_pcm_runtime *runtime = substream->runtime;
1799 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1800 int k, err;
1801
1802 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1803 snd_mask_any(constrs_mask(constrs, k));
1804 }
1805
1806 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1807 snd_interval_any(constrs_interval(constrs, k));
1808 }
1809
1810 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1811 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1812 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1813 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1814 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1815
1816 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1817 snd_pcm_hw_rule_format, NULL,
1818 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1819 if (err < 0)
1820 return err;
1821 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1822 snd_pcm_hw_rule_sample_bits, NULL,
1823 SNDRV_PCM_HW_PARAM_FORMAT,
1824 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1825 if (err < 0)
1826 return err;
1827 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1828 snd_pcm_hw_rule_div, NULL,
1829 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1830 if (err < 0)
1831 return err;
1832 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1833 snd_pcm_hw_rule_mul, NULL,
1834 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1835 if (err < 0)
1836 return err;
1837 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1838 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1839 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1840 if (err < 0)
1841 return err;
1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1843 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1844 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1845 if (err < 0)
1846 return err;
1847 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1848 snd_pcm_hw_rule_div, NULL,
1849 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1850 if (err < 0)
1851 return err;
1852 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1853 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1854 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1855 if (err < 0)
1856 return err;
1857 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1858 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1859 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1860 if (err < 0)
1861 return err;
1862 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1863 snd_pcm_hw_rule_div, NULL,
1864 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1865 if (err < 0)
1866 return err;
1867 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1868 snd_pcm_hw_rule_div, NULL,
1869 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1870 if (err < 0)
1871 return err;
1872 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1873 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1874 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1875 if (err < 0)
1876 return err;
1877 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1878 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1879 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1880 if (err < 0)
1881 return err;
1882 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1883 snd_pcm_hw_rule_mul, NULL,
1884 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1885 if (err < 0)
1886 return err;
1887 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1888 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1889 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1890 if (err < 0)
1891 return err;
1892 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1893 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1894 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1895 if (err < 0)
1896 return err;
1897 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1898 snd_pcm_hw_rule_muldivk, (void*) 8,
1899 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1900 if (err < 0)
1901 return err;
1902 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1903 snd_pcm_hw_rule_muldivk, (void*) 8,
1904 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1905 if (err < 0)
1906 return err;
1907 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1908 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1909 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1910 if (err < 0)
1911 return err;
1912 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1913 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1914 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1915 if (err < 0)
1916 return err;
1917 return 0;
1918 }
1919
1920 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1921 {
1922 struct snd_pcm_runtime *runtime = substream->runtime;
1923 struct snd_pcm_hardware *hw = &runtime->hw;
1924 int err;
1925 unsigned int mask = 0;
1926
1927 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1928 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1929 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1930 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1931 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1932 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1933 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1934 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1935 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1936 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1937 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1938 }
1939 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1940 snd_assert(err >= 0, return -EINVAL);
1941
1942 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1943 snd_assert(err >= 0, return -EINVAL);
1944
1945 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1946 snd_assert(err >= 0, return -EINVAL);
1947
1948 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1949 hw->channels_min, hw->channels_max);
1950 snd_assert(err >= 0, return -EINVAL);
1951
1952 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1953 hw->rate_min, hw->rate_max);
1954 snd_assert(err >= 0, return -EINVAL);
1955
1956 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1957 hw->period_bytes_min, hw->period_bytes_max);
1958 snd_assert(err >= 0, return -EINVAL);
1959
1960 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1961 hw->periods_min, hw->periods_max);
1962 snd_assert(err >= 0, return -EINVAL);
1963
1964 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1965 hw->period_bytes_min, hw->buffer_bytes_max);
1966 snd_assert(err >= 0, return -EINVAL);
1967
1968 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1969 snd_pcm_hw_rule_buffer_bytes_max, substream,
1970 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1971 if (err < 0)
1972 return err;
1973
1974 /* FIXME: remove */
1975 if (runtime->dma_bytes) {
1976 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1977 snd_assert(err >= 0, return -EINVAL);
1978 }
1979
1980 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1981 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1982 snd_pcm_hw_rule_rate, hw,
1983 SNDRV_PCM_HW_PARAM_RATE, -1);
1984 if (err < 0)
1985 return err;
1986 }
1987
1988 /* FIXME: this belong to lowlevel */
1989 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1990
1991 return 0;
1992 }
1993
1994 static void pcm_release_private(struct snd_pcm_substream *substream)
1995 {
1996 snd_pcm_unlink(substream);
1997 }
1998
1999 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2000 {
2001 substream->ref_count--;
2002 if (substream->ref_count > 0)
2003 return;
2004
2005 snd_pcm_drop(substream);
2006 if (substream->hw_opened) {
2007 if (substream->ops->hw_free != NULL)
2008 substream->ops->hw_free(substream);
2009 substream->ops->close(substream);
2010 substream->hw_opened = 0;
2011 }
2012 if (substream->pcm_release) {
2013 substream->pcm_release(substream);
2014 substream->pcm_release = NULL;
2015 }
2016 snd_pcm_detach_substream(substream);
2017 }
2018
2019 EXPORT_SYMBOL(snd_pcm_release_substream);
2020
2021 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2022 struct file *file,
2023 struct snd_pcm_substream **rsubstream)
2024 {
2025 struct snd_pcm_substream *substream;
2026 int err;
2027
2028 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2029 if (err < 0)
2030 return err;
2031 if (substream->ref_count > 1) {
2032 *rsubstream = substream;
2033 return 0;
2034 }
2035
2036 err = snd_pcm_hw_constraints_init(substream);
2037 if (err < 0) {
2038 snd_printd("snd_pcm_hw_constraints_init failed\n");
2039 goto error;
2040 }
2041
2042 if ((err = substream->ops->open(substream)) < 0)
2043 goto error;
2044
2045 substream->hw_opened = 1;
2046
2047 err = snd_pcm_hw_constraints_complete(substream);
2048 if (err < 0) {
2049 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2050 goto error;
2051 }
2052
2053 *rsubstream = substream;
2054 return 0;
2055
2056 error:
2057 snd_pcm_release_substream(substream);
2058 return err;
2059 }
2060
2061 EXPORT_SYMBOL(snd_pcm_open_substream);
2062
2063 static int snd_pcm_open_file(struct file *file,
2064 struct snd_pcm *pcm,
2065 int stream,
2066 struct snd_pcm_file **rpcm_file)
2067 {
2068 struct snd_pcm_file *pcm_file;
2069 struct snd_pcm_substream *substream;
2070 struct snd_pcm_str *str;
2071 int err;
2072
2073 snd_assert(rpcm_file != NULL, return -EINVAL);
2074 *rpcm_file = NULL;
2075
2076 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2077 if (err < 0)
2078 return err;
2079
2080 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2081 if (pcm_file == NULL) {
2082 snd_pcm_release_substream(substream);
2083 return -ENOMEM;
2084 }
2085 pcm_file->substream = substream;
2086 if (substream->ref_count == 1) {
2087 str = substream->pstr;
2088 substream->file = pcm_file;
2089 substream->pcm_release = pcm_release_private;
2090 }
2091 file->private_data = pcm_file;
2092 *rpcm_file = pcm_file;
2093 return 0;
2094 }
2095
2096 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2097 {
2098 struct snd_pcm *pcm;
2099
2100 pcm = snd_lookup_minor_data(iminor(inode),
2101 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2102 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2103 }
2104
2105 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2106 {
2107 struct snd_pcm *pcm;
2108
2109 pcm = snd_lookup_minor_data(iminor(inode),
2110 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2111 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2112 }
2113
2114 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2115 {
2116 int err;
2117 struct snd_pcm_file *pcm_file;
2118 wait_queue_t wait;
2119
2120 if (pcm == NULL) {
2121 err = -ENODEV;
2122 goto __error1;
2123 }
2124 err = snd_card_file_add(pcm->card, file);
2125 if (err < 0)
2126 goto __error1;
2127 if (!try_module_get(pcm->card->module)) {
2128 err = -EFAULT;
2129 goto __error2;
2130 }
2131 init_waitqueue_entry(&wait, current);
2132 add_wait_queue(&pcm->open_wait, &wait);
2133 mutex_lock(&pcm->open_mutex);
2134 while (1) {
2135 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2136 if (err >= 0)
2137 break;
2138 if (err == -EAGAIN) {
2139 if (file->f_flags & O_NONBLOCK) {
2140 err = -EBUSY;
2141 break;
2142 }
2143 } else
2144 break;
2145 set_current_state(TASK_INTERRUPTIBLE);
2146 mutex_unlock(&pcm->open_mutex);
2147 schedule();
2148 mutex_lock(&pcm->open_mutex);
2149 if (signal_pending(current)) {
2150 err = -ERESTARTSYS;
2151 break;
2152 }
2153 }
2154 remove_wait_queue(&pcm->open_wait, &wait);
2155 mutex_unlock(&pcm->open_mutex);
2156 if (err < 0)
2157 goto __error;
2158 return err;
2159
2160 __error:
2161 module_put(pcm->card->module);
2162 __error2:
2163 snd_card_file_remove(pcm->card, file);
2164 __error1:
2165 return err;
2166 }
2167
2168 static int snd_pcm_release(struct inode *inode, struct file *file)
2169 {
2170 struct snd_pcm *pcm;
2171 struct snd_pcm_substream *substream;
2172 struct snd_pcm_file *pcm_file;
2173
2174 pcm_file = file->private_data;
2175 substream = pcm_file->substream;
2176 snd_assert(substream != NULL, return -ENXIO);
2177 pcm = substream->pcm;
2178 fasync_helper(-1, file, 0, &substream->runtime->fasync);
2179 mutex_lock(&pcm->open_mutex);
2180 snd_pcm_release_substream(substream);
2181 kfree(pcm_file);
2182 mutex_unlock(&pcm->open_mutex);
2183 wake_up(&pcm->open_wait);
2184 module_put(pcm->card->module);
2185 snd_card_file_remove(pcm->card, file);
2186 return 0;
2187 }
2188
2189 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2190 snd_pcm_uframes_t frames)
2191 {
2192 struct snd_pcm_runtime *runtime = substream->runtime;
2193 snd_pcm_sframes_t appl_ptr;
2194 snd_pcm_sframes_t ret;
2195 snd_pcm_sframes_t hw_avail;
2196
2197 if (frames == 0)
2198 return 0;
2199
2200 snd_pcm_stream_lock_irq(substream);
2201 switch (runtime->status->state) {
2202 case SNDRV_PCM_STATE_PREPARED:
2203 break;
2204 case SNDRV_PCM_STATE_DRAINING:
2205 case SNDRV_PCM_STATE_RUNNING:
2206 if (snd_pcm_update_hw_ptr(substream) >= 0)
2207 break;
2208 /* Fall through */
2209 case SNDRV_PCM_STATE_XRUN:
2210 ret = -EPIPE;
2211 goto __end;
2212 default:
2213 ret = -EBADFD;
2214 goto __end;
2215 }
2216
2217 hw_avail = snd_pcm_playback_hw_avail(runtime);
2218 if (hw_avail <= 0) {
2219 ret = 0;
2220 goto __end;
2221 }
2222 if (frames > (snd_pcm_uframes_t)hw_avail)
2223 frames = hw_avail;
2224 appl_ptr = runtime->control->appl_ptr - frames;
2225 if (appl_ptr < 0)
2226 appl_ptr += runtime->boundary;
2227 runtime->control->appl_ptr = appl_ptr;
2228 ret = frames;
2229 __end:
2230 snd_pcm_stream_unlock_irq(substream);
2231 return ret;
2232 }
2233
2234 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2235 snd_pcm_uframes_t frames)
2236 {
2237 struct snd_pcm_runtime *runtime = substream->runtime;
2238 snd_pcm_sframes_t appl_ptr;
2239 snd_pcm_sframes_t ret;
2240 snd_pcm_sframes_t hw_avail;
2241
2242 if (frames == 0)
2243 return 0;
2244
2245 snd_pcm_stream_lock_irq(substream);
2246 switch (runtime->status->state) {
2247 case SNDRV_PCM_STATE_PREPARED:
2248 case SNDRV_PCM_STATE_DRAINING:
2249 break;
2250 case SNDRV_PCM_STATE_RUNNING:
2251 if (snd_pcm_update_hw_ptr(substream) >= 0)
2252 break;
2253 /* Fall through */
2254 case SNDRV_PCM_STATE_XRUN:
2255 ret = -EPIPE;
2256 goto __end;
2257 default:
2258 ret = -EBADFD;
2259 goto __end;
2260 }
2261
2262 hw_avail = snd_pcm_capture_hw_avail(runtime);
2263 if (hw_avail <= 0) {
2264 ret = 0;
2265 goto __end;
2266 }
2267 if (frames > (snd_pcm_uframes_t)hw_avail)
2268 frames = hw_avail;
2269 appl_ptr = runtime->control->appl_ptr - frames;
2270 if (appl_ptr < 0)
2271 appl_ptr += runtime->boundary;
2272 runtime->control->appl_ptr = appl_ptr;
2273 ret = frames;
2274 __end:
2275 snd_pcm_stream_unlock_irq(substream);
2276 return ret;
2277 }
2278
2279 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2280 snd_pcm_uframes_t frames)
2281 {
2282 struct snd_pcm_runtime *runtime = substream->runtime;
2283 snd_pcm_sframes_t appl_ptr;
2284 snd_pcm_sframes_t ret;
2285 snd_pcm_sframes_t avail;
2286
2287 if (frames == 0)
2288 return 0;
2289
2290 snd_pcm_stream_lock_irq(substream);
2291 switch (runtime->status->state) {
2292 case SNDRV_PCM_STATE_PREPARED:
2293 case SNDRV_PCM_STATE_PAUSED:
2294 break;
2295 case SNDRV_PCM_STATE_DRAINING:
2296 case SNDRV_PCM_STATE_RUNNING:
2297 if (snd_pcm_update_hw_ptr(substream) >= 0)
2298 break;
2299 /* Fall through */
2300 case SNDRV_PCM_STATE_XRUN:
2301 ret = -EPIPE;
2302 goto __end;
2303 default:
2304 ret = -EBADFD;
2305 goto __end;
2306 }
2307
2308 avail = snd_pcm_playback_avail(runtime);
2309 if (avail <= 0) {
2310 ret = 0;
2311 goto __end;
2312 }
2313 if (frames > (snd_pcm_uframes_t)avail)
2314 frames = avail;
2315 appl_ptr = runtime->control->appl_ptr + frames;
2316 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2317 appl_ptr -= runtime->boundary;
2318 runtime->control->appl_ptr = appl_ptr;
2319 ret = frames;
2320 __end:
2321 snd_pcm_stream_unlock_irq(substream);
2322 return ret;
2323 }
2324
2325 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2326 snd_pcm_uframes_t frames)
2327 {
2328 struct snd_pcm_runtime *runtime = substream->runtime;
2329 snd_pcm_sframes_t appl_ptr;
2330 snd_pcm_sframes_t ret;
2331 snd_pcm_sframes_t avail;
2332
2333 if (frames == 0)
2334 return 0;
2335
2336 snd_pcm_stream_lock_irq(substream);
2337 switch (runtime->status->state) {
2338 case SNDRV_PCM_STATE_PREPARED:
2339 case SNDRV_PCM_STATE_DRAINING:
2340 case SNDRV_PCM_STATE_PAUSED:
2341 break;
2342 case SNDRV_PCM_STATE_RUNNING:
2343 if (snd_pcm_update_hw_ptr(substream) >= 0)
2344 break;
2345 /* Fall through */
2346 case SNDRV_PCM_STATE_XRUN:
2347 ret = -EPIPE;
2348 goto __end;
2349 default:
2350 ret = -EBADFD;
2351 goto __end;
2352 }
2353
2354 avail = snd_pcm_capture_avail(runtime);
2355 if (avail <= 0) {
2356 ret = 0;
2357 goto __end;
2358 }
2359 if (frames > (snd_pcm_uframes_t)avail)
2360 frames = avail;
2361 appl_ptr = runtime->control->appl_ptr + frames;
2362 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2363 appl_ptr -= runtime->boundary;
2364 runtime->control->appl_ptr = appl_ptr;
2365 ret = frames;
2366 __end:
2367 snd_pcm_stream_unlock_irq(substream);
2368 return ret;
2369 }
2370
2371 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2372 {
2373 struct snd_pcm_runtime *runtime = substream->runtime;
2374 int err;
2375
2376 snd_pcm_stream_lock_irq(substream);
2377 switch (runtime->status->state) {
2378 case SNDRV_PCM_STATE_DRAINING:
2379 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2380 goto __badfd;
2381 case SNDRV_PCM_STATE_RUNNING:
2382 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2383 break;
2384 /* Fall through */
2385 case SNDRV_PCM_STATE_PREPARED:
2386 case SNDRV_PCM_STATE_SUSPENDED:
2387 err = 0;
2388 break;
2389 case SNDRV_PCM_STATE_XRUN:
2390 err = -EPIPE;
2391 break;
2392 default:
2393 __badfd:
2394 err = -EBADFD;
2395 break;
2396 }
2397 snd_pcm_stream_unlock_irq(substream);
2398 return err;
2399 }
2400
2401 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2402 snd_pcm_sframes_t __user *res)
2403 {
2404 struct snd_pcm_runtime *runtime = substream->runtime;
2405 int err;
2406 snd_pcm_sframes_t n = 0;
2407
2408 snd_pcm_stream_lock_irq(substream);
2409 switch (runtime->status->state) {
2410 case SNDRV_PCM_STATE_DRAINING:
2411 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2412 goto __badfd;
2413 case SNDRV_PCM_STATE_RUNNING:
2414 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2415 break;
2416 /* Fall through */
2417 case SNDRV_PCM_STATE_PREPARED:
2418 case SNDRV_PCM_STATE_SUSPENDED:
2419 err = 0;
2420 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2421 n = snd_pcm_playback_hw_avail(runtime);
2422 else
2423 n = snd_pcm_capture_avail(runtime);
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 snd_assert(substream != NULL, return -ENXIO);
2500
2501 switch (cmd) {
2502 case SNDRV_PCM_IOCTL_PVERSION:
2503 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2504 case SNDRV_PCM_IOCTL_INFO:
2505 return snd_pcm_info_user(substream, arg);
2506 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2507 return 0;
2508 case SNDRV_PCM_IOCTL_TTSTAMP:
2509 return snd_pcm_tstamp(substream, arg);
2510 case SNDRV_PCM_IOCTL_HW_REFINE:
2511 return snd_pcm_hw_refine_user(substream, arg);
2512 case SNDRV_PCM_IOCTL_HW_PARAMS:
2513 return snd_pcm_hw_params_user(substream, arg);
2514 case SNDRV_PCM_IOCTL_HW_FREE:
2515 return snd_pcm_hw_free(substream);
2516 case SNDRV_PCM_IOCTL_SW_PARAMS:
2517 return snd_pcm_sw_params_user(substream, arg);
2518 case SNDRV_PCM_IOCTL_STATUS:
2519 return snd_pcm_status_user(substream, arg);
2520 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2521 return snd_pcm_channel_info_user(substream, arg);
2522 case SNDRV_PCM_IOCTL_PREPARE:
2523 return snd_pcm_prepare(substream, file);
2524 case SNDRV_PCM_IOCTL_RESET:
2525 return snd_pcm_reset(substream);
2526 case SNDRV_PCM_IOCTL_START:
2527 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2528 case SNDRV_PCM_IOCTL_LINK:
2529 return snd_pcm_link(substream, (int)(unsigned long) arg);
2530 case SNDRV_PCM_IOCTL_UNLINK:
2531 return snd_pcm_unlink(substream);
2532 case SNDRV_PCM_IOCTL_RESUME:
2533 return snd_pcm_resume(substream);
2534 case SNDRV_PCM_IOCTL_XRUN:
2535 return snd_pcm_xrun(substream);
2536 case SNDRV_PCM_IOCTL_HWSYNC:
2537 return snd_pcm_hwsync(substream);
2538 case SNDRV_PCM_IOCTL_DELAY:
2539 return snd_pcm_delay(substream, arg);
2540 case SNDRV_PCM_IOCTL_SYNC_PTR:
2541 return snd_pcm_sync_ptr(substream, arg);
2542 #ifdef CONFIG_SND_SUPPORT_OLD_API
2543 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2544 return snd_pcm_hw_refine_old_user(substream, arg);
2545 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2546 return snd_pcm_hw_params_old_user(substream, arg);
2547 #endif
2548 case SNDRV_PCM_IOCTL_DRAIN:
2549 return snd_pcm_drain(substream);
2550 case SNDRV_PCM_IOCTL_DROP:
2551 return snd_pcm_drop(substream);
2552 case SNDRV_PCM_IOCTL_PAUSE:
2553 {
2554 int res;
2555 snd_pcm_stream_lock_irq(substream);
2556 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2557 snd_pcm_stream_unlock_irq(substream);
2558 return res;
2559 }
2560 }
2561 snd_printd("unknown ioctl = 0x%x\n", cmd);
2562 return -ENOTTY;
2563 }
2564
2565 static int snd_pcm_playback_ioctl1(struct file *file,
2566 struct snd_pcm_substream *substream,
2567 unsigned int cmd, void __user *arg)
2568 {
2569 snd_assert(substream != NULL, return -ENXIO);
2570 snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, 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 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2604 if (bufs == NULL)
2605 return -ENOMEM;
2606 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2607 kfree(bufs);
2608 return -EFAULT;
2609 }
2610 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2611 kfree(bufs);
2612 __put_user(result, &_xfern->result);
2613 return result < 0 ? result : 0;
2614 }
2615 case SNDRV_PCM_IOCTL_REWIND:
2616 {
2617 snd_pcm_uframes_t frames;
2618 snd_pcm_uframes_t __user *_frames = arg;
2619 snd_pcm_sframes_t result;
2620 if (get_user(frames, _frames))
2621 return -EFAULT;
2622 if (put_user(0, _frames))
2623 return -EFAULT;
2624 result = snd_pcm_playback_rewind(substream, frames);
2625 __put_user(result, _frames);
2626 return result < 0 ? result : 0;
2627 }
2628 case SNDRV_PCM_IOCTL_FORWARD:
2629 {
2630 snd_pcm_uframes_t frames;
2631 snd_pcm_uframes_t __user *_frames = arg;
2632 snd_pcm_sframes_t result;
2633 if (get_user(frames, _frames))
2634 return -EFAULT;
2635 if (put_user(0, _frames))
2636 return -EFAULT;
2637 result = snd_pcm_playback_forward(substream, frames);
2638 __put_user(result, _frames);
2639 return result < 0 ? result : 0;
2640 }
2641 }
2642 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2643 }
2644
2645 static int snd_pcm_capture_ioctl1(struct file *file,
2646 struct snd_pcm_substream *substream,
2647 unsigned int cmd, void __user *arg)
2648 {
2649 snd_assert(substream != NULL, return -ENXIO);
2650 snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, 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 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2684 if (bufs == NULL)
2685 return -ENOMEM;
2686 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2687 kfree(bufs);
2688 return -EFAULT;
2689 }
2690 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2691 kfree(bufs);
2692 __put_user(result, &_xfern->result);
2693 return result < 0 ? result : 0;
2694 }
2695 case SNDRV_PCM_IOCTL_REWIND:
2696 {
2697 snd_pcm_uframes_t frames;
2698 snd_pcm_uframes_t __user *_frames = arg;
2699 snd_pcm_sframes_t result;
2700 if (get_user(frames, _frames))
2701 return -EFAULT;
2702 if (put_user(0, _frames))
2703 return -EFAULT;
2704 result = snd_pcm_capture_rewind(substream, frames);
2705 __put_user(result, _frames);
2706 return result < 0 ? result : 0;
2707 }
2708 case SNDRV_PCM_IOCTL_FORWARD:
2709 {
2710 snd_pcm_uframes_t frames;
2711 snd_pcm_uframes_t __user *_frames = arg;
2712 snd_pcm_sframes_t result;
2713 if (get_user(frames, _frames))
2714 return -EFAULT;
2715 if (put_user(0, _frames))
2716 return -EFAULT;
2717 result = snd_pcm_capture_forward(substream, frames);
2718 __put_user(result, _frames);
2719 return result < 0 ? result : 0;
2720 }
2721 }
2722 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2723 }
2724
2725 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2726 unsigned long arg)
2727 {
2728 struct snd_pcm_file *pcm_file;
2729
2730 pcm_file = file->private_data;
2731
2732 if (((cmd >> 8) & 0xff) != 'A')
2733 return -ENOTTY;
2734
2735 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2736 (void __user *)arg);
2737 }
2738
2739 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2740 unsigned long arg)
2741 {
2742 struct snd_pcm_file *pcm_file;
2743
2744 pcm_file = file->private_data;
2745
2746 if (((cmd >> 8) & 0xff) != 'A')
2747 return -ENOTTY;
2748
2749 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2750 (void __user *)arg);
2751 }
2752
2753 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2754 unsigned int cmd, void *arg)
2755 {
2756 mm_segment_t fs;
2757 int result;
2758
2759 fs = snd_enter_user();
2760 switch (substream->stream) {
2761 case SNDRV_PCM_STREAM_PLAYBACK:
2762 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2763 (void __user *)arg);
2764 break;
2765 case SNDRV_PCM_STREAM_CAPTURE:
2766 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2767 (void __user *)arg);
2768 break;
2769 default:
2770 result = -EINVAL;
2771 break;
2772 }
2773 snd_leave_user(fs);
2774 return result;
2775 }
2776
2777 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2778
2779 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2780 loff_t * offset)
2781 {
2782 struct snd_pcm_file *pcm_file;
2783 struct snd_pcm_substream *substream;
2784 struct snd_pcm_runtime *runtime;
2785 snd_pcm_sframes_t result;
2786
2787 pcm_file = file->private_data;
2788 substream = pcm_file->substream;
2789 snd_assert(substream != NULL, return -ENXIO);
2790 runtime = substream->runtime;
2791 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2792 return -EBADFD;
2793 if (!frame_aligned(runtime, count))
2794 return -EINVAL;
2795 count = bytes_to_frames(runtime, count);
2796 result = snd_pcm_lib_read(substream, buf, count);
2797 if (result > 0)
2798 result = frames_to_bytes(runtime, result);
2799 return result;
2800 }
2801
2802 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2803 size_t count, loff_t * offset)
2804 {
2805 struct snd_pcm_file *pcm_file;
2806 struct snd_pcm_substream *substream;
2807 struct snd_pcm_runtime *runtime;
2808 snd_pcm_sframes_t result;
2809
2810 pcm_file = file->private_data;
2811 substream = pcm_file->substream;
2812 snd_assert(substream != NULL, result = -ENXIO; goto end);
2813 runtime = substream->runtime;
2814 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2815 result = -EBADFD;
2816 goto end;
2817 }
2818 if (!frame_aligned(runtime, count)) {
2819 result = -EINVAL;
2820 goto end;
2821 }
2822 count = bytes_to_frames(runtime, count);
2823 result = snd_pcm_lib_write(substream, buf, count);
2824 if (result > 0)
2825 result = frames_to_bytes(runtime, result);
2826 end:
2827 return result;
2828 }
2829
2830 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2831 unsigned long nr_segs, loff_t pos)
2832
2833 {
2834 struct snd_pcm_file *pcm_file;
2835 struct snd_pcm_substream *substream;
2836 struct snd_pcm_runtime *runtime;
2837 snd_pcm_sframes_t result;
2838 unsigned long i;
2839 void __user **bufs;
2840 snd_pcm_uframes_t frames;
2841
2842 pcm_file = iocb->ki_filp->private_data;
2843 substream = pcm_file->substream;
2844 snd_assert(substream != NULL, return -ENXIO);
2845 runtime = substream->runtime;
2846 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2847 return -EBADFD;
2848 if (nr_segs > 1024 || nr_segs != runtime->channels)
2849 return -EINVAL;
2850 if (!frame_aligned(runtime, iov->iov_len))
2851 return -EINVAL;
2852 frames = bytes_to_samples(runtime, iov->iov_len);
2853 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2854 if (bufs == NULL)
2855 return -ENOMEM;
2856 for (i = 0; i < nr_segs; ++i)
2857 bufs[i] = iov[i].iov_base;
2858 result = snd_pcm_lib_readv(substream, bufs, frames);
2859 if (result > 0)
2860 result = frames_to_bytes(runtime, result);
2861 kfree(bufs);
2862 return result;
2863 }
2864
2865 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2866 unsigned long nr_segs, loff_t pos)
2867 {
2868 struct snd_pcm_file *pcm_file;
2869 struct snd_pcm_substream *substream;
2870 struct snd_pcm_runtime *runtime;
2871 snd_pcm_sframes_t result;
2872 unsigned long i;
2873 void __user **bufs;
2874 snd_pcm_uframes_t frames;
2875
2876 pcm_file = iocb->ki_filp->private_data;
2877 substream = pcm_file->substream;
2878 snd_assert(substream != NULL, result = -ENXIO; goto end);
2879 runtime = substream->runtime;
2880 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2881 result = -EBADFD;
2882 goto end;
2883 }
2884 if (nr_segs > 128 || nr_segs != runtime->channels ||
2885 !frame_aligned(runtime, iov->iov_len)) {
2886 result = -EINVAL;
2887 goto end;
2888 }
2889 frames = bytes_to_samples(runtime, iov->iov_len);
2890 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2891 if (bufs == NULL)
2892 return -ENOMEM;
2893 for (i = 0; i < nr_segs; ++i)
2894 bufs[i] = iov[i].iov_base;
2895 result = snd_pcm_lib_writev(substream, bufs, frames);
2896 if (result > 0)
2897 result = frames_to_bytes(runtime, result);
2898 kfree(bufs);
2899 end:
2900 return result;
2901 }
2902
2903 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2904 {
2905 struct snd_pcm_file *pcm_file;
2906 struct snd_pcm_substream *substream;
2907 struct snd_pcm_runtime *runtime;
2908 unsigned int mask;
2909 snd_pcm_uframes_t avail;
2910
2911 pcm_file = file->private_data;
2912
2913 substream = pcm_file->substream;
2914 snd_assert(substream != NULL, return -ENXIO);
2915 runtime = substream->runtime;
2916
2917 poll_wait(file, &runtime->sleep, wait);
2918
2919 snd_pcm_stream_lock_irq(substream);
2920 avail = snd_pcm_playback_avail(runtime);
2921 switch (runtime->status->state) {
2922 case SNDRV_PCM_STATE_RUNNING:
2923 case SNDRV_PCM_STATE_PREPARED:
2924 case SNDRV_PCM_STATE_PAUSED:
2925 if (avail >= runtime->control->avail_min) {
2926 mask = POLLOUT | POLLWRNORM;
2927 break;
2928 }
2929 /* Fall through */
2930 case SNDRV_PCM_STATE_DRAINING:
2931 mask = 0;
2932 break;
2933 default:
2934 mask = POLLOUT | POLLWRNORM | POLLERR;
2935 break;
2936 }
2937 snd_pcm_stream_unlock_irq(substream);
2938 return mask;
2939 }
2940
2941 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2942 {
2943 struct snd_pcm_file *pcm_file;
2944 struct snd_pcm_substream *substream;
2945 struct snd_pcm_runtime *runtime;
2946 unsigned int mask;
2947 snd_pcm_uframes_t avail;
2948
2949 pcm_file = file->private_data;
2950
2951 substream = pcm_file->substream;
2952 snd_assert(substream != NULL, return -ENXIO);
2953 runtime = substream->runtime;
2954
2955 poll_wait(file, &runtime->sleep, wait);
2956
2957 snd_pcm_stream_lock_irq(substream);
2958 avail = snd_pcm_capture_avail(runtime);
2959 switch (runtime->status->state) {
2960 case SNDRV_PCM_STATE_RUNNING:
2961 case SNDRV_PCM_STATE_PREPARED:
2962 case SNDRV_PCM_STATE_PAUSED:
2963 if (avail >= runtime->control->avail_min) {
2964 mask = POLLIN | POLLRDNORM;
2965 break;
2966 }
2967 mask = 0;
2968 break;
2969 case SNDRV_PCM_STATE_DRAINING:
2970 if (avail > 0) {
2971 mask = POLLIN | POLLRDNORM;
2972 break;
2973 }
2974 /* Fall through */
2975 default:
2976 mask = POLLIN | POLLRDNORM | POLLERR;
2977 break;
2978 }
2979 snd_pcm_stream_unlock_irq(substream);
2980 return mask;
2981 }
2982
2983 /*
2984 * mmap support
2985 */
2986
2987 /*
2988 * Only on coherent architectures, we can mmap the status and the control records
2989 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2990 */
2991 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2992 /*
2993 * mmap status record
2994 */
2995 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2996 struct vm_fault *vmf)
2997 {
2998 struct snd_pcm_substream *substream = area->vm_private_data;
2999 struct snd_pcm_runtime *runtime;
3000
3001 if (substream == NULL)
3002 return VM_FAULT_SIGBUS;
3003 runtime = substream->runtime;
3004 vmf->page = virt_to_page(runtime->status);
3005 get_page(vmf->page);
3006 return 0;
3007 }
3008
3009 static struct vm_operations_struct snd_pcm_vm_ops_status =
3010 {
3011 .fault = snd_pcm_mmap_status_fault,
3012 };
3013
3014 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3015 struct vm_area_struct *area)
3016 {
3017 struct snd_pcm_runtime *runtime;
3018 long size;
3019 if (!(area->vm_flags & VM_READ))
3020 return -EINVAL;
3021 runtime = substream->runtime;
3022 snd_assert(runtime != NULL, return -EAGAIN);
3023 size = area->vm_end - area->vm_start;
3024 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3025 return -EINVAL;
3026 area->vm_ops = &snd_pcm_vm_ops_status;
3027 area->vm_private_data = substream;
3028 area->vm_flags |= VM_RESERVED;
3029 return 0;
3030 }
3031
3032 /*
3033 * mmap control record
3034 */
3035 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3036 struct vm_fault *vmf)
3037 {
3038 struct snd_pcm_substream *substream = area->vm_private_data;
3039 struct snd_pcm_runtime *runtime;
3040
3041 if (substream == NULL)
3042 return VM_FAULT_SIGBUS;
3043 runtime = substream->runtime;
3044 vmf->page = virt_to_page(runtime->control);
3045 get_page(vmf->page);
3046 return 0;
3047 }
3048
3049 static struct vm_operations_struct snd_pcm_vm_ops_control =
3050 {
3051 .fault = snd_pcm_mmap_control_fault,
3052 };
3053
3054 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3055 struct vm_area_struct *area)
3056 {
3057 struct snd_pcm_runtime *runtime;
3058 long size;
3059 if (!(area->vm_flags & VM_READ))
3060 return -EINVAL;
3061 runtime = substream->runtime;
3062 snd_assert(runtime != NULL, return -EAGAIN);
3063 size = area->vm_end - area->vm_start;
3064 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3065 return -EINVAL;
3066 area->vm_ops = &snd_pcm_vm_ops_control;
3067 area->vm_private_data = substream;
3068 area->vm_flags |= VM_RESERVED;
3069 return 0;
3070 }
3071 #else /* ! coherent mmap */
3072 /*
3073 * don't support mmap for status and control records.
3074 */
3075 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3076 struct vm_area_struct *area)
3077 {
3078 return -ENXIO;
3079 }
3080 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3081 struct vm_area_struct *area)
3082 {
3083 return -ENXIO;
3084 }
3085 #endif /* coherent mmap */
3086
3087 /*
3088 * fault callback for mmapping a RAM page
3089 */
3090 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3091 struct vm_fault *vmf)
3092 {
3093 struct snd_pcm_substream *substream = area->vm_private_data;
3094 struct snd_pcm_runtime *runtime;
3095 unsigned long offset;
3096 struct page * page;
3097 void *vaddr;
3098 size_t dma_bytes;
3099
3100 if (substream == NULL)
3101 return VM_FAULT_SIGBUS;
3102 runtime = substream->runtime;
3103 offset = vmf->pgoff << PAGE_SHIFT;
3104 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3105 if (offset > dma_bytes - PAGE_SIZE)
3106 return VM_FAULT_SIGBUS;
3107 if (substream->ops->page) {
3108 page = substream->ops->page(substream, offset);
3109 if (!page)
3110 return VM_FAULT_SIGBUS;
3111 } else {
3112 vaddr = runtime->dma_area + offset;
3113 page = virt_to_page(vaddr);
3114 }
3115 get_page(page);
3116 vmf->page = page;
3117 return 0;
3118 }
3119
3120 static struct vm_operations_struct snd_pcm_vm_ops_data =
3121 {
3122 .open = snd_pcm_mmap_data_open,
3123 .close = snd_pcm_mmap_data_close,
3124 .fault = snd_pcm_mmap_data_fault,
3125 };
3126
3127 /*
3128 * mmap the DMA buffer on RAM
3129 */
3130 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3131 struct vm_area_struct *area)
3132 {
3133 area->vm_ops = &snd_pcm_vm_ops_data;
3134 area->vm_private_data = substream;
3135 area->vm_flags |= VM_RESERVED;
3136 atomic_inc(&substream->mmap_count);
3137 return 0;
3138 }
3139
3140 /*
3141 * mmap the DMA buffer on I/O memory area
3142 */
3143 #if SNDRV_PCM_INFO_MMAP_IOMEM
3144 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3145 {
3146 .open = snd_pcm_mmap_data_open,
3147 .close = snd_pcm_mmap_data_close,
3148 };
3149
3150 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3151 struct vm_area_struct *area)
3152 {
3153 long size;
3154 unsigned long offset;
3155
3156 #ifdef pgprot_noncached
3157 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3158 #endif
3159 area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3160 area->vm_private_data = substream;
3161 area->vm_flags |= VM_IO;
3162 size = area->vm_end - area->vm_start;
3163 offset = area->vm_pgoff << PAGE_SHIFT;
3164 if (io_remap_pfn_range(area, area->vm_start,
3165 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3166 size, area->vm_page_prot))
3167 return -EAGAIN;
3168 atomic_inc(&substream->mmap_count);
3169 return 0;
3170 }
3171
3172 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3173 #endif /* SNDRV_PCM_INFO_MMAP */
3174
3175 /*
3176 * mmap DMA buffer
3177 */
3178 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3179 struct vm_area_struct *area)
3180 {
3181 struct snd_pcm_runtime *runtime;
3182 long size;
3183 unsigned long offset;
3184 size_t dma_bytes;
3185
3186 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3187 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3188 return -EINVAL;
3189 } else {
3190 if (!(area->vm_flags & VM_READ))
3191 return -EINVAL;
3192 }
3193 runtime = substream->runtime;
3194 snd_assert(runtime != NULL, return -EAGAIN);
3195 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3196 return -EBADFD;
3197 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3198 return -ENXIO;
3199 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3200 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3201 return -EINVAL;
3202 size = area->vm_end - area->vm_start;
3203 offset = area->vm_pgoff << PAGE_SHIFT;
3204 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3205 if ((size_t)size > dma_bytes)
3206 return -EINVAL;
3207 if (offset > dma_bytes - size)
3208 return -EINVAL;
3209
3210 if (substream->ops->mmap)
3211 return substream->ops->mmap(substream, area);
3212 else
3213 return snd_pcm_default_mmap(substream, area);
3214 }
3215
3216 EXPORT_SYMBOL(snd_pcm_mmap_data);
3217
3218 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3219 {
3220 struct snd_pcm_file * pcm_file;
3221 struct snd_pcm_substream *substream;
3222 unsigned long offset;
3223
3224 pcm_file = file->private_data;
3225 substream = pcm_file->substream;
3226 snd_assert(substream != NULL, return -ENXIO);
3227
3228 offset = area->vm_pgoff << PAGE_SHIFT;
3229 switch (offset) {
3230 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3231 if (pcm_file->no_compat_mmap)
3232 return -ENXIO;
3233 return snd_pcm_mmap_status(substream, file, area);
3234 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3235 if (pcm_file->no_compat_mmap)
3236 return -ENXIO;
3237 return snd_pcm_mmap_control(substream, file, area);
3238 default:
3239 return snd_pcm_mmap_data(substream, file, area);
3240 }
3241 return 0;
3242 }
3243
3244 static int snd_pcm_fasync(int fd, struct file * file, int on)
3245 {
3246 struct snd_pcm_file * pcm_file;
3247 struct snd_pcm_substream *substream;
3248 struct snd_pcm_runtime *runtime;
3249 int err;
3250
3251 pcm_file = file->private_data;
3252 substream = pcm_file->substream;
3253 snd_assert(substream != NULL, return -ENXIO);
3254 runtime = substream->runtime;
3255
3256 err = fasync_helper(fd, file, on, &runtime->fasync);
3257 if (err < 0)
3258 return err;
3259 return 0;
3260 }
3261
3262 /*
3263 * ioctl32 compat
3264 */
3265 #ifdef CONFIG_COMPAT
3266 #include "pcm_compat.c"
3267 #else
3268 #define snd_pcm_ioctl_compat NULL
3269 #endif
3270
3271 /*
3272 * To be removed helpers to keep binary compatibility
3273 */
3274
3275 #ifdef CONFIG_SND_SUPPORT_OLD_API
3276 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3277 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3278
3279 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3280 struct snd_pcm_hw_params_old *oparams)
3281 {
3282 unsigned int i;
3283
3284 memset(params, 0, sizeof(*params));
3285 params->flags = oparams->flags;
3286 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3287 params->masks[i].bits[0] = oparams->masks[i];
3288 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3289 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3290 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3291 params->info = oparams->info;
3292 params->msbits = oparams->msbits;
3293 params->rate_num = oparams->rate_num;
3294 params->rate_den = oparams->rate_den;
3295 params->fifo_size = oparams->fifo_size;
3296 }
3297
3298 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3299 struct snd_pcm_hw_params *params)
3300 {
3301 unsigned int i;
3302
3303 memset(oparams, 0, sizeof(*oparams));
3304 oparams->flags = params->flags;
3305 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3306 oparams->masks[i] = params->masks[i].bits[0];
3307 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3308 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3309 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3310 oparams->info = params->info;
3311 oparams->msbits = params->msbits;
3312 oparams->rate_num = params->rate_num;
3313 oparams->rate_den = params->rate_den;
3314 oparams->fifo_size = params->fifo_size;
3315 }
3316
3317 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3318 struct snd_pcm_hw_params_old __user * _oparams)
3319 {
3320 struct snd_pcm_hw_params *params;
3321 struct snd_pcm_hw_params_old *oparams = NULL;
3322 int err;
3323
3324 params = kmalloc(sizeof(*params), GFP_KERNEL);
3325 if (!params) {
3326 err = -ENOMEM;
3327 goto out;
3328 }
3329 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3330 if (!oparams) {
3331 err = -ENOMEM;
3332 goto out;
3333 }
3334
3335 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3336 err = -EFAULT;
3337 goto out;
3338 }
3339 snd_pcm_hw_convert_from_old_params(params, oparams);
3340 err = snd_pcm_hw_refine(substream, params);
3341 snd_pcm_hw_convert_to_old_params(oparams, params);
3342 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3343 if (!err)
3344 err = -EFAULT;
3345 }
3346 out:
3347 kfree(params);
3348 kfree(oparams);
3349 return err;
3350 }
3351
3352 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3353 struct snd_pcm_hw_params_old __user * _oparams)
3354 {
3355 struct snd_pcm_hw_params *params;
3356 struct snd_pcm_hw_params_old *oparams = NULL;
3357 int err;
3358
3359 params = kmalloc(sizeof(*params), GFP_KERNEL);
3360 if (!params) {
3361 err = -ENOMEM;
3362 goto out;
3363 }
3364 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3365 if (!oparams) {
3366 err = -ENOMEM;
3367 goto out;
3368 }
3369 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3370 err = -EFAULT;
3371 goto out;
3372 }
3373 snd_pcm_hw_convert_from_old_params(params, oparams);
3374 err = snd_pcm_hw_params(substream, params);
3375 snd_pcm_hw_convert_to_old_params(oparams, params);
3376 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3377 if (!err)
3378 err = -EFAULT;
3379 }
3380 out:
3381 kfree(params);
3382 kfree(oparams);
3383 return err;
3384 }
3385 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3386
3387 /*
3388 * Register section
3389 */
3390
3391 const struct file_operations snd_pcm_f_ops[2] = {
3392 {
3393 .owner = THIS_MODULE,
3394 .write = snd_pcm_write,
3395 .aio_write = snd_pcm_aio_write,
3396 .open = snd_pcm_playback_open,
3397 .release = snd_pcm_release,
3398 .poll = snd_pcm_playback_poll,
3399 .unlocked_ioctl = snd_pcm_playback_ioctl,
3400 .compat_ioctl = snd_pcm_ioctl_compat,
3401 .mmap = snd_pcm_mmap,
3402 .fasync = snd_pcm_fasync,
3403 },
3404 {
3405 .owner = THIS_MODULE,
3406 .read = snd_pcm_read,
3407 .aio_read = snd_pcm_aio_read,
3408 .open = snd_pcm_capture_open,
3409 .release = snd_pcm_release,
3410 .poll = snd_pcm_capture_poll,
3411 .unlocked_ioctl = snd_pcm_capture_ioctl,
3412 .compat_ioctl = snd_pcm_ioctl_compat,
3413 .mmap = snd_pcm_mmap,
3414 .fasync = snd_pcm_fasync,
3415 }
3416 };
WRT350N Kernel Patches