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ucc_geth: Factor out MAC initialization steps into a call
[firewire-audio.git] / sound / core / pcm_native.c
blobac2150e0670d8541e4023fb21fdb600e4bef6df8
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/mm.h>
23 #include <linux/file.h>
24 #include <linux/slab.h>
25 #include <linux/smp_lock.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos_params.h>
28 #include <linux/uio.h>
29 #include <sound/core.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/timer.h>
35 #include <sound/minors.h>
36 #include <asm/io.h>
37
38 /*
39 * Compatibility
40 */
41
42 struct snd_pcm_hw_params_old {
43 unsigned int flags;
44 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
45 SNDRV_PCM_HW_PARAM_ACCESS + 1];
46 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
47 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
48 unsigned int rmask;
49 unsigned int cmask;
50 unsigned int info;
51 unsigned int msbits;
52 unsigned int rate_num;
53 unsigned int rate_den;
54 snd_pcm_uframes_t fifo_size;
55 unsigned char reserved[64];
56 };
57
58 #ifdef CONFIG_SND_SUPPORT_OLD_API
59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
61
62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
63 struct snd_pcm_hw_params_old __user * _oparams);
64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66 #endif
67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
68
69 /*
70 *
71 */
72
73 DEFINE_RWLOCK(snd_pcm_link_rwlock);
74 EXPORT_SYMBOL(snd_pcm_link_rwlock);
75
76 static DECLARE_RWSEM(snd_pcm_link_rwsem);
77
78 static inline mm_segment_t snd_enter_user(void)
79 {
80 mm_segment_t fs = get_fs();
81 set_fs(get_ds());
82 return fs;
83 }
84
85 static inline void snd_leave_user(mm_segment_t fs)
86 {
87 set_fs(fs);
88 }
89
90
91
92 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
93 {
94 struct snd_pcm_runtime *runtime;
95 struct snd_pcm *pcm = substream->pcm;
96 struct snd_pcm_str *pstr = substream->pstr;
97
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(KERN_DEBUG "%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(KERN_DEBUG "%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(KERN_DEBUG "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 & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
316 if (!params->fifo_size) {
317 if (snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) ==
318 snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) &&
319 snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS]) ==
320 snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS])) {
321 changed = substream->ops->ioctl(substream,
322 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
323 if (changed < 0)
324 return changed;
325 }
326 }
327 params->rmask = 0;
328 return 0;
329 }
330
331 EXPORT_SYMBOL(snd_pcm_hw_refine);
332
333 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
334 struct snd_pcm_hw_params __user * _params)
335 {
336 struct snd_pcm_hw_params *params;
337 int err;
338
339 params = memdup_user(_params, sizeof(*params));
340 if (IS_ERR(params))
341 return PTR_ERR(params);
342
343 err = snd_pcm_hw_refine(substream, params);
344 if (copy_to_user(_params, params, sizeof(*params))) {
345 if (!err)
346 err = -EFAULT;
347 }
348
349 kfree(params);
350 return err;
351 }
352
353 static int period_to_usecs(struct snd_pcm_runtime *runtime)
354 {
355 int usecs;
356
357 if (! runtime->rate)
358 return -1; /* invalid */
359
360 /* take 75% of period time as the deadline */
361 usecs = (750000 / runtime->rate) * runtime->period_size;
362 usecs += ((750000 % runtime->rate) * runtime->period_size) /
363 runtime->rate;
364
365 return usecs;
366 }
367
368 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
369 struct snd_pcm_hw_params *params)
370 {
371 struct snd_pcm_runtime *runtime;
372 int err, usecs;
373 unsigned int bits;
374 snd_pcm_uframes_t frames;
375
376 if (PCM_RUNTIME_CHECK(substream))
377 return -ENXIO;
378 runtime = substream->runtime;
379 snd_pcm_stream_lock_irq(substream);
380 switch (runtime->status->state) {
381 case SNDRV_PCM_STATE_OPEN:
382 case SNDRV_PCM_STATE_SETUP:
383 case SNDRV_PCM_STATE_PREPARED:
384 break;
385 default:
386 snd_pcm_stream_unlock_irq(substream);
387 return -EBADFD;
388 }
389 snd_pcm_stream_unlock_irq(substream);
390 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
391 if (!substream->oss.oss)
392 #endif
393 if (atomic_read(&substream->mmap_count))
394 return -EBADFD;
395
396 params->rmask = ~0U;
397 err = snd_pcm_hw_refine(substream, params);
398 if (err < 0)
399 goto _error;
400
401 err = snd_pcm_hw_params_choose(substream, params);
402 if (err < 0)
403 goto _error;
404
405 if (substream->ops->hw_params != NULL) {
406 err = substream->ops->hw_params(substream, params);
407 if (err < 0)
408 goto _error;
409 }
410
411 runtime->access = params_access(params);
412 runtime->format = params_format(params);
413 runtime->subformat = params_subformat(params);
414 runtime->channels = params_channels(params);
415 runtime->rate = params_rate(params);
416 runtime->period_size = params_period_size(params);
417 runtime->periods = params_periods(params);
418 runtime->buffer_size = params_buffer_size(params);
419 runtime->info = params->info;
420 runtime->rate_num = params->rate_num;
421 runtime->rate_den = params->rate_den;
422
423 bits = snd_pcm_format_physical_width(runtime->format);
424 runtime->sample_bits = bits;
425 bits *= runtime->channels;
426 runtime->frame_bits = bits;
427 frames = 1;
428 while (bits % 8 != 0) {
429 bits *= 2;
430 frames *= 2;
431 }
432 runtime->byte_align = bits / 8;
433 runtime->min_align = frames;
434
435 /* Default sw params */
436 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
437 runtime->period_step = 1;
438 runtime->control->avail_min = runtime->period_size;
439 runtime->start_threshold = 1;
440 runtime->stop_threshold = runtime->buffer_size;
441 runtime->silence_threshold = 0;
442 runtime->silence_size = 0;
443 runtime->boundary = runtime->buffer_size;
444 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
445 runtime->boundary *= 2;
446
447 snd_pcm_timer_resolution_change(substream);
448 runtime->status->state = SNDRV_PCM_STATE_SETUP;
449
450 pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
451 substream->latency_id);
452 if ((usecs = period_to_usecs(runtime)) >= 0)
453 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
454 substream->latency_id, usecs);
455 return 0;
456 _error:
457 /* hardware might be unuseable from this time,
458 so we force application to retry to set
459 the correct hardware parameter settings */
460 runtime->status->state = SNDRV_PCM_STATE_OPEN;
461 if (substream->ops->hw_free != NULL)
462 substream->ops->hw_free(substream);
463 return err;
464 }
465
466 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
467 struct snd_pcm_hw_params __user * _params)
468 {
469 struct snd_pcm_hw_params *params;
470 int err;
471
472 params = memdup_user(_params, sizeof(*params));
473 if (IS_ERR(params))
474 return PTR_ERR(params);
475
476 err = snd_pcm_hw_params(substream, params);
477 if (copy_to_user(_params, params, sizeof(*params))) {
478 if (!err)
479 err = -EFAULT;
480 }
481
482 kfree(params);
483 return err;
484 }
485
486 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
487 {
488 struct snd_pcm_runtime *runtime;
489 int result = 0;
490
491 if (PCM_RUNTIME_CHECK(substream))
492 return -ENXIO;
493 runtime = substream->runtime;
494 snd_pcm_stream_lock_irq(substream);
495 switch (runtime->status->state) {
496 case SNDRV_PCM_STATE_SETUP:
497 case SNDRV_PCM_STATE_PREPARED:
498 break;
499 default:
500 snd_pcm_stream_unlock_irq(substream);
501 return -EBADFD;
502 }
503 snd_pcm_stream_unlock_irq(substream);
504 if (atomic_read(&substream->mmap_count))
505 return -EBADFD;
506 if (substream->ops->hw_free)
507 result = substream->ops->hw_free(substream);
508 runtime->status->state = SNDRV_PCM_STATE_OPEN;
509 pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
510 substream->latency_id);
511 return result;
512 }
513
514 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
515 struct snd_pcm_sw_params *params)
516 {
517 struct snd_pcm_runtime *runtime;
518
519 if (PCM_RUNTIME_CHECK(substream))
520 return -ENXIO;
521 runtime = substream->runtime;
522 snd_pcm_stream_lock_irq(substream);
523 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
524 snd_pcm_stream_unlock_irq(substream);
525 return -EBADFD;
526 }
527 snd_pcm_stream_unlock_irq(substream);
528
529 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
530 return -EINVAL;
531 if (params->avail_min == 0)
532 return -EINVAL;
533 if (params->silence_size >= runtime->boundary) {
534 if (params->silence_threshold != 0)
535 return -EINVAL;
536 } else {
537 if (params->silence_size > params->silence_threshold)
538 return -EINVAL;
539 if (params->silence_threshold > runtime->buffer_size)
540 return -EINVAL;
541 }
542 snd_pcm_stream_lock_irq(substream);
543 runtime->tstamp_mode = params->tstamp_mode;
544 runtime->period_step = params->period_step;
545 runtime->control->avail_min = params->avail_min;
546 runtime->start_threshold = params->start_threshold;
547 runtime->stop_threshold = params->stop_threshold;
548 runtime->silence_threshold = params->silence_threshold;
549 runtime->silence_size = params->silence_size;
550 params->boundary = runtime->boundary;
551 if (snd_pcm_running(substream)) {
552 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
553 runtime->silence_size > 0)
554 snd_pcm_playback_silence(substream, ULONG_MAX);
555 wake_up(&runtime->sleep);
556 }
557 snd_pcm_stream_unlock_irq(substream);
558 return 0;
559 }
560
561 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
562 struct snd_pcm_sw_params __user * _params)
563 {
564 struct snd_pcm_sw_params params;
565 int err;
566 if (copy_from_user(&params, _params, sizeof(params)))
567 return -EFAULT;
568 err = snd_pcm_sw_params(substream, &params);
569 if (copy_to_user(_params, &params, sizeof(params)))
570 return -EFAULT;
571 return err;
572 }
573
574 int snd_pcm_status(struct snd_pcm_substream *substream,
575 struct snd_pcm_status *status)
576 {
577 struct snd_pcm_runtime *runtime = substream->runtime;
578
579 snd_pcm_stream_lock_irq(substream);
580 status->state = runtime->status->state;
581 status->suspended_state = runtime->status->suspended_state;
582 if (status->state == SNDRV_PCM_STATE_OPEN)
583 goto _end;
584 status->trigger_tstamp = runtime->trigger_tstamp;
585 if (snd_pcm_running(substream)) {
586 snd_pcm_update_hw_ptr(substream);
587 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
588 status->tstamp = runtime->status->tstamp;
589 goto _tstamp_end;
590 }
591 }
592 snd_pcm_gettime(runtime, &status->tstamp);
593 _tstamp_end:
594 status->appl_ptr = runtime->control->appl_ptr;
595 status->hw_ptr = runtime->status->hw_ptr;
596 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
597 status->avail = snd_pcm_playback_avail(runtime);
598 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
599 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
600 status->delay = runtime->buffer_size - status->avail;
601 status->delay += runtime->delay;
602 } else
603 status->delay = 0;
604 } else {
605 status->avail = snd_pcm_capture_avail(runtime);
606 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
607 status->delay = status->avail + runtime->delay;
608 else
609 status->delay = 0;
610 }
611 status->avail_max = runtime->avail_max;
612 status->overrange = runtime->overrange;
613 runtime->avail_max = 0;
614 runtime->overrange = 0;
615 _end:
616 snd_pcm_stream_unlock_irq(substream);
617 return 0;
618 }
619
620 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
621 struct snd_pcm_status __user * _status)
622 {
623 struct snd_pcm_status status;
624 int res;
625
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 channel = info->channel;
642 runtime = substream->runtime;
643 snd_pcm_stream_lock_irq(substream);
644 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
645 snd_pcm_stream_unlock_irq(substream);
646 return -EBADFD;
647 }
648 snd_pcm_stream_unlock_irq(substream);
649 if (channel >= runtime->channels)
650 return -EINVAL;
651 memset(info, 0, sizeof(*info));
652 info->channel = channel;
653 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
654 }
655
656 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
657 struct snd_pcm_channel_info __user * _info)
658 {
659 struct snd_pcm_channel_info info;
660 int res;
661
662 if (copy_from_user(&info, _info, sizeof(info)))
663 return -EFAULT;
664 res = snd_pcm_channel_info(substream, &info);
665 if (res < 0)
666 return res;
667 if (copy_to_user(_info, &info, sizeof(info)))
668 return -EFAULT;
669 return 0;
670 }
671
672 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
673 {
674 struct snd_pcm_runtime *runtime = substream->runtime;
675 if (runtime->trigger_master == NULL)
676 return;
677 if (runtime->trigger_master == substream) {
678 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
679 } else {
680 snd_pcm_trigger_tstamp(runtime->trigger_master);
681 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
682 }
683 runtime->trigger_master = NULL;
684 }
685
686 struct action_ops {
687 int (*pre_action)(struct snd_pcm_substream *substream, int state);
688 int (*do_action)(struct snd_pcm_substream *substream, int state);
689 void (*undo_action)(struct snd_pcm_substream *substream, int state);
690 void (*post_action)(struct snd_pcm_substream *substream, int state);
691 };
692
693 /*
694 * this functions is core for handling of linked stream
695 * Note: the stream state might be changed also on failure
696 * Note2: call with calling stream lock + link lock
697 */
698 static int snd_pcm_action_group(struct action_ops *ops,
699 struct snd_pcm_substream *substream,
700 int state, int do_lock)
701 {
702 struct snd_pcm_substream *s = NULL;
703 struct snd_pcm_substream *s1;
704 int res = 0;
705
706 snd_pcm_group_for_each_entry(s, substream) {
707 if (do_lock && s != substream)
708 spin_lock_nested(&s->self_group.lock,
709 SINGLE_DEPTH_NESTING);
710 res = ops->pre_action(s, state);
711 if (res < 0)
712 goto _unlock;
713 }
714 snd_pcm_group_for_each_entry(s, substream) {
715 res = ops->do_action(s, state);
716 if (res < 0) {
717 if (ops->undo_action) {
718 snd_pcm_group_for_each_entry(s1, substream) {
719 if (s1 == s) /* failed stream */
720 break;
721 ops->undo_action(s1, state);
722 }
723 }
724 s = NULL; /* unlock all */
725 goto _unlock;
726 }
727 }
728 snd_pcm_group_for_each_entry(s, substream) {
729 ops->post_action(s, state);
730 }
731 _unlock:
732 if (do_lock) {
733 /* unlock streams */
734 snd_pcm_group_for_each_entry(s1, substream) {
735 if (s1 != substream)
736 spin_unlock(&s1->self_group.lock);
737 if (s1 == s) /* end */
738 break;
739 }
740 }
741 return res;
742 }
743
744 /*
745 * Note: call with stream lock
746 */
747 static int snd_pcm_action_single(struct action_ops *ops,
748 struct snd_pcm_substream *substream,
749 int state)
750 {
751 int res;
752
753 res = ops->pre_action(substream, state);
754 if (res < 0)
755 return res;
756 res = ops->do_action(substream, state);
757 if (res == 0)
758 ops->post_action(substream, state);
759 else if (ops->undo_action)
760 ops->undo_action(substream, state);
761 return res;
762 }
763
764 /*
765 * Note: call with stream lock
766 */
767 static int snd_pcm_action(struct action_ops *ops,
768 struct snd_pcm_substream *substream,
769 int state)
770 {
771 int res;
772
773 if (snd_pcm_stream_linked(substream)) {
774 if (!spin_trylock(&substream->group->lock)) {
775 spin_unlock(&substream->self_group.lock);
776 spin_lock(&substream->group->lock);
777 spin_lock(&substream->self_group.lock);
778 }
779 res = snd_pcm_action_group(ops, substream, state, 1);
780 spin_unlock(&substream->group->lock);
781 } else {
782 res = snd_pcm_action_single(ops, substream, state);
783 }
784 return res;
785 }
786
787 /*
788 * Note: don't use any locks before
789 */
790 static int snd_pcm_action_lock_irq(struct action_ops *ops,
791 struct snd_pcm_substream *substream,
792 int state)
793 {
794 int res;
795
796 read_lock_irq(&snd_pcm_link_rwlock);
797 if (snd_pcm_stream_linked(substream)) {
798 spin_lock(&substream->group->lock);
799 spin_lock(&substream->self_group.lock);
800 res = snd_pcm_action_group(ops, substream, state, 1);
801 spin_unlock(&substream->self_group.lock);
802 spin_unlock(&substream->group->lock);
803 } else {
804 spin_lock(&substream->self_group.lock);
805 res = snd_pcm_action_single(ops, substream, state);
806 spin_unlock(&substream->self_group.lock);
807 }
808 read_unlock_irq(&snd_pcm_link_rwlock);
809 return res;
810 }
811
812 /*
813 */
814 static int snd_pcm_action_nonatomic(struct action_ops *ops,
815 struct snd_pcm_substream *substream,
816 int state)
817 {
818 int res;
819
820 down_read(&snd_pcm_link_rwsem);
821 if (snd_pcm_stream_linked(substream))
822 res = snd_pcm_action_group(ops, substream, state, 0);
823 else
824 res = snd_pcm_action_single(ops, substream, state);
825 up_read(&snd_pcm_link_rwsem);
826 return res;
827 }
828
829 /*
830 * start callbacks
831 */
832 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
833 {
834 struct snd_pcm_runtime *runtime = substream->runtime;
835 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
836 return -EBADFD;
837 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
838 !snd_pcm_playback_data(substream))
839 return -EPIPE;
840 runtime->trigger_master = substream;
841 return 0;
842 }
843
844 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
845 {
846 if (substream->runtime->trigger_master != substream)
847 return 0;
848 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
849 }
850
851 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
852 {
853 if (substream->runtime->trigger_master == substream)
854 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
855 }
856
857 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
858 {
859 struct snd_pcm_runtime *runtime = substream->runtime;
860 snd_pcm_trigger_tstamp(substream);
861 runtime->hw_ptr_jiffies = jiffies;
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 - start all linked streams
880 * @substream: the PCM substream instance
881 */
882 int snd_pcm_start(struct snd_pcm_substream *substream)
883 {
884 return snd_pcm_action(&snd_pcm_action_start, substream,
885 SNDRV_PCM_STATE_RUNNING);
886 }
887
888 /*
889 * stop callbacks
890 */
891 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
892 {
893 struct snd_pcm_runtime *runtime = substream->runtime;
894 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
895 return -EBADFD;
896 runtime->trigger_master = substream;
897 return 0;
898 }
899
900 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
901 {
902 if (substream->runtime->trigger_master == substream &&
903 snd_pcm_running(substream))
904 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
905 return 0; /* unconditonally stop all substreams */
906 }
907
908 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
909 {
910 struct snd_pcm_runtime *runtime = substream->runtime;
911 if (runtime->status->state != state) {
912 snd_pcm_trigger_tstamp(substream);
913 if (substream->timer)
914 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
915 &runtime->trigger_tstamp);
916 runtime->status->state = state;
917 }
918 wake_up(&runtime->sleep);
919 }
920
921 static struct action_ops snd_pcm_action_stop = {
922 .pre_action = snd_pcm_pre_stop,
923 .do_action = snd_pcm_do_stop,
924 .post_action = snd_pcm_post_stop
925 };
926
927 /**
928 * snd_pcm_stop - try to stop all running streams in the substream group
929 * @substream: the PCM substream instance
930 * @state: PCM state after stopping the stream
931 *
932 * The state of each stream is then changed to the given state unconditionally.
933 */
934 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
935 {
936 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
937 }
938
939 EXPORT_SYMBOL(snd_pcm_stop);
940
941 /**
942 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
943 * @substream: the PCM substream
944 *
945 * After stopping, the state is changed to SETUP.
946 * Unlike snd_pcm_stop(), this affects only the given stream.
947 */
948 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
949 {
950 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
951 SNDRV_PCM_STATE_SETUP);
952 }
953
954 /*
955 * pause callbacks
956 */
957 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
958 {
959 struct snd_pcm_runtime *runtime = substream->runtime;
960 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
961 return -ENOSYS;
962 if (push) {
963 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
964 return -EBADFD;
965 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
966 return -EBADFD;
967 runtime->trigger_master = substream;
968 return 0;
969 }
970
971 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
972 {
973 if (substream->runtime->trigger_master != substream)
974 return 0;
975 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
976 * a delta betwen the current jiffies, this gives a large enough
977 * delta, effectively to skip the check once.
978 */
979 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
980 return substream->ops->trigger(substream,
981 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
982 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
983 }
984
985 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
986 {
987 if (substream->runtime->trigger_master == substream)
988 substream->ops->trigger(substream,
989 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
990 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
991 }
992
993 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
994 {
995 struct snd_pcm_runtime *runtime = substream->runtime;
996 snd_pcm_trigger_tstamp(substream);
997 if (push) {
998 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
999 if (substream->timer)
1000 snd_timer_notify(substream->timer,
1001 SNDRV_TIMER_EVENT_MPAUSE,
1002 &runtime->trigger_tstamp);
1003 wake_up(&runtime->sleep);
1004 } else {
1005 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1006 if (substream->timer)
1007 snd_timer_notify(substream->timer,
1008 SNDRV_TIMER_EVENT_MCONTINUE,
1009 &runtime->trigger_tstamp);
1010 }
1011 }
1012
1013 static struct action_ops snd_pcm_action_pause = {
1014 .pre_action = snd_pcm_pre_pause,
1015 .do_action = snd_pcm_do_pause,
1016 .undo_action = snd_pcm_undo_pause,
1017 .post_action = snd_pcm_post_pause
1018 };
1019
1020 /*
1021 * Push/release the pause for all linked streams.
1022 */
1023 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1024 {
1025 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1026 }
1027
1028 #ifdef CONFIG_PM
1029 /* suspend */
1030
1031 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1032 {
1033 struct snd_pcm_runtime *runtime = substream->runtime;
1034 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1035 return -EBUSY;
1036 runtime->trigger_master = substream;
1037 return 0;
1038 }
1039
1040 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1041 {
1042 struct snd_pcm_runtime *runtime = substream->runtime;
1043 if (runtime->trigger_master != substream)
1044 return 0;
1045 if (! snd_pcm_running(substream))
1046 return 0;
1047 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1048 return 0; /* suspend unconditionally */
1049 }
1050
1051 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1052 {
1053 struct snd_pcm_runtime *runtime = substream->runtime;
1054 snd_pcm_trigger_tstamp(substream);
1055 if (substream->timer)
1056 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1057 &runtime->trigger_tstamp);
1058 runtime->status->suspended_state = runtime->status->state;
1059 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1060 wake_up(&runtime->sleep);
1061 }
1062
1063 static struct action_ops snd_pcm_action_suspend = {
1064 .pre_action = snd_pcm_pre_suspend,
1065 .do_action = snd_pcm_do_suspend,
1066 .post_action = snd_pcm_post_suspend
1067 };
1068
1069 /**
1070 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1071 * @substream: the PCM substream
1072 *
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 - trigger SUSPEND to all substreams in the given pcm
1093 * @pcm: the PCM instance
1094 *
1095 * After this call, all streams are changed to SUSPENDED state.
1096 */
1097 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1098 {
1099 struct snd_pcm_substream *substream;
1100 int stream, err = 0;
1101
1102 if (! pcm)
1103 return 0;
1104
1105 for (stream = 0; stream < 2; stream++) {
1106 for (substream = pcm->streams[stream].substream;
1107 substream; substream = substream->next) {
1108 /* FIXME: the open/close code should lock this as well */
1109 if (substream->runtime == NULL)
1110 continue;
1111 err = snd_pcm_suspend(substream);
1112 if (err < 0 && err != -EBUSY)
1113 return err;
1114 }
1115 }
1116 return 0;
1117 }
1118
1119 EXPORT_SYMBOL(snd_pcm_suspend_all);
1120
1121 /* resume */
1122
1123 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1124 {
1125 struct snd_pcm_runtime *runtime = substream->runtime;
1126 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1127 return -ENOSYS;
1128 runtime->trigger_master = substream;
1129 return 0;
1130 }
1131
1132 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1133 {
1134 struct snd_pcm_runtime *runtime = substream->runtime;
1135 if (runtime->trigger_master != substream)
1136 return 0;
1137 /* DMA not running previously? */
1138 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1139 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1140 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1141 return 0;
1142 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1143 }
1144
1145 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1146 {
1147 if (substream->runtime->trigger_master == substream &&
1148 snd_pcm_running(substream))
1149 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1150 }
1151
1152 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1153 {
1154 struct snd_pcm_runtime *runtime = substream->runtime;
1155 snd_pcm_trigger_tstamp(substream);
1156 if (substream->timer)
1157 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1158 &runtime->trigger_tstamp);
1159 runtime->status->state = runtime->status->suspended_state;
1160 }
1161
1162 static struct action_ops snd_pcm_action_resume = {
1163 .pre_action = snd_pcm_pre_resume,
1164 .do_action = snd_pcm_do_resume,
1165 .undo_action = snd_pcm_undo_resume,
1166 .post_action = snd_pcm_post_resume
1167 };
1168
1169 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1170 {
1171 struct snd_card *card = substream->pcm->card;
1172 int res;
1173
1174 snd_power_lock(card);
1175 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1176 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1177 snd_power_unlock(card);
1178 return res;
1179 }
1180
1181 #else
1182
1183 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1184 {
1185 return -ENOSYS;
1186 }
1187
1188 #endif /* CONFIG_PM */
1189
1190 /*
1191 * xrun ioctl
1192 *
1193 * Change the RUNNING stream(s) to XRUN state.
1194 */
1195 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1196 {
1197 struct snd_card *card = substream->pcm->card;
1198 struct snd_pcm_runtime *runtime = substream->runtime;
1199 int result;
1200
1201 snd_power_lock(card);
1202 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1203 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1204 if (result < 0)
1205 goto _unlock;
1206 }
1207
1208 snd_pcm_stream_lock_irq(substream);
1209 switch (runtime->status->state) {
1210 case SNDRV_PCM_STATE_XRUN:
1211 result = 0; /* already there */
1212 break;
1213 case SNDRV_PCM_STATE_RUNNING:
1214 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1215 break;
1216 default:
1217 result = -EBADFD;
1218 }
1219 snd_pcm_stream_unlock_irq(substream);
1220 _unlock:
1221 snd_power_unlock(card);
1222 return result;
1223 }
1224
1225 /*
1226 * reset ioctl
1227 */
1228 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1229 {
1230 struct snd_pcm_runtime *runtime = substream->runtime;
1231 switch (runtime->status->state) {
1232 case SNDRV_PCM_STATE_RUNNING:
1233 case SNDRV_PCM_STATE_PREPARED:
1234 case SNDRV_PCM_STATE_PAUSED:
1235 case SNDRV_PCM_STATE_SUSPENDED:
1236 return 0;
1237 default:
1238 return -EBADFD;
1239 }
1240 }
1241
1242 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1243 {
1244 struct snd_pcm_runtime *runtime = substream->runtime;
1245 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1246 if (err < 0)
1247 return err;
1248 runtime->hw_ptr_base = 0;
1249 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1250 runtime->status->hw_ptr % runtime->period_size;
1251 runtime->silence_start = runtime->status->hw_ptr;
1252 runtime->silence_filled = 0;
1253 return 0;
1254 }
1255
1256 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1257 {
1258 struct snd_pcm_runtime *runtime = substream->runtime;
1259 runtime->control->appl_ptr = runtime->status->hw_ptr;
1260 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1261 runtime->silence_size > 0)
1262 snd_pcm_playback_silence(substream, ULONG_MAX);
1263 }
1264
1265 static struct action_ops snd_pcm_action_reset = {
1266 .pre_action = snd_pcm_pre_reset,
1267 .do_action = snd_pcm_do_reset,
1268 .post_action = snd_pcm_post_reset
1269 };
1270
1271 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1272 {
1273 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1274 }
1275
1276 /*
1277 * prepare ioctl
1278 */
1279 /* we use the second argument for updating f_flags */
1280 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1281 int f_flags)
1282 {
1283 struct snd_pcm_runtime *runtime = substream->runtime;
1284 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1285 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1286 return -EBADFD;
1287 if (snd_pcm_running(substream))
1288 return -EBUSY;
1289 substream->f_flags = f_flags;
1290 return 0;
1291 }
1292
1293 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1294 {
1295 int err;
1296 err = substream->ops->prepare(substream);
1297 if (err < 0)
1298 return err;
1299 return snd_pcm_do_reset(substream, 0);
1300 }
1301
1302 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1303 {
1304 struct snd_pcm_runtime *runtime = substream->runtime;
1305 runtime->control->appl_ptr = runtime->status->hw_ptr;
1306 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1307 }
1308
1309 static struct action_ops snd_pcm_action_prepare = {
1310 .pre_action = snd_pcm_pre_prepare,
1311 .do_action = snd_pcm_do_prepare,
1312 .post_action = snd_pcm_post_prepare
1313 };
1314
1315 /**
1316 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1317 * @substream: the PCM substream instance
1318 * @file: file to refer f_flags
1319 */
1320 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1321 struct file *file)
1322 {
1323 int res;
1324 struct snd_card *card = substream->pcm->card;
1325 int f_flags;
1326
1327 if (file)
1328 f_flags = file->f_flags;
1329 else
1330 f_flags = substream->f_flags;
1331
1332 snd_power_lock(card);
1333 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1334 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1335 substream, f_flags);
1336 snd_power_unlock(card);
1337 return res;
1338 }
1339
1340 /*
1341 * drain ioctl
1342 */
1343
1344 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1345 {
1346 if (substream->f_flags & O_NONBLOCK)
1347 return -EAGAIN;
1348 substream->runtime->trigger_master = substream;
1349 return 0;
1350 }
1351
1352 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1353 {
1354 struct snd_pcm_runtime *runtime = substream->runtime;
1355 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1356 switch (runtime->status->state) {
1357 case SNDRV_PCM_STATE_PREPARED:
1358 /* start playback stream if possible */
1359 if (! snd_pcm_playback_empty(substream)) {
1360 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1361 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1362 }
1363 break;
1364 case SNDRV_PCM_STATE_RUNNING:
1365 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1366 break;
1367 default:
1368 break;
1369 }
1370 } else {
1371 /* stop running stream */
1372 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1373 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1374 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1375 snd_pcm_do_stop(substream, new_state);
1376 snd_pcm_post_stop(substream, new_state);
1377 }
1378 }
1379 return 0;
1380 }
1381
1382 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1383 {
1384 }
1385
1386 static struct action_ops snd_pcm_action_drain_init = {
1387 .pre_action = snd_pcm_pre_drain_init,
1388 .do_action = snd_pcm_do_drain_init,
1389 .post_action = snd_pcm_post_drain_init
1390 };
1391
1392 struct drain_rec {
1393 struct snd_pcm_substream *substream;
1394 wait_queue_t wait;
1395 snd_pcm_uframes_t stop_threshold;
1396 };
1397
1398 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1399
1400 /*
1401 * Drain the stream(s).
1402 * When the substream is linked, sync until the draining of all playback streams
1403 * is finished.
1404 * After this call, all streams are supposed to be either SETUP or DRAINING
1405 * (capture only) state.
1406 */
1407 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1408 {
1409 struct snd_card *card;
1410 struct snd_pcm_runtime *runtime;
1411 struct snd_pcm_substream *s;
1412 int result = 0;
1413 int i, num_drecs;
1414 struct drain_rec *drec, drec_tmp, *d;
1415
1416 card = substream->pcm->card;
1417 runtime = substream->runtime;
1418
1419 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1420 return -EBADFD;
1421
1422 snd_power_lock(card);
1423 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1424 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1425 if (result < 0) {
1426 snd_power_unlock(card);
1427 return result;
1428 }
1429 }
1430
1431 /* allocate temporary record for drain sync */
1432 down_read(&snd_pcm_link_rwsem);
1433 if (snd_pcm_stream_linked(substream)) {
1434 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1435 if (! drec) {
1436 up_read(&snd_pcm_link_rwsem);
1437 snd_power_unlock(card);
1438 return -ENOMEM;
1439 }
1440 } else
1441 drec = &drec_tmp;
1442
1443 /* count only playback streams */
1444 num_drecs = 0;
1445 snd_pcm_group_for_each_entry(s, substream) {
1446 runtime = s->runtime;
1447 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1448 d = &drec[num_drecs++];
1449 d->substream = s;
1450 init_waitqueue_entry(&d->wait, current);
1451 add_wait_queue(&runtime->sleep, &d->wait);
1452 /* stop_threshold fixup to avoid endless loop when
1453 * stop_threshold > buffer_size
1454 */
1455 d->stop_threshold = runtime->stop_threshold;
1456 if (runtime->stop_threshold > runtime->buffer_size)
1457 runtime->stop_threshold = runtime->buffer_size;
1458 }
1459 }
1460 up_read(&snd_pcm_link_rwsem);
1461
1462 snd_pcm_stream_lock_irq(substream);
1463 /* resume pause */
1464 if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1465 snd_pcm_pause(substream, 0);
1466
1467 /* pre-start/stop - all running streams are changed to DRAINING state */
1468 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1469 if (result < 0) {
1470 snd_pcm_stream_unlock_irq(substream);
1471 goto _error;
1472 }
1473
1474 for (;;) {
1475 long tout;
1476 if (signal_pending(current)) {
1477 result = -ERESTARTSYS;
1478 break;
1479 }
1480 /* all finished? */
1481 for (i = 0; i < num_drecs; i++) {
1482 runtime = drec[i].substream->runtime;
1483 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1484 break;
1485 }
1486 if (i == num_drecs)
1487 break; /* yes, all drained */
1488
1489 set_current_state(TASK_INTERRUPTIBLE);
1490 snd_pcm_stream_unlock_irq(substream);
1491 snd_power_unlock(card);
1492 tout = schedule_timeout(10 * HZ);
1493 snd_power_lock(card);
1494 snd_pcm_stream_lock_irq(substream);
1495 if (tout == 0) {
1496 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1497 result = -ESTRPIPE;
1498 else {
1499 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1500 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1501 result = -EIO;
1502 }
1503 break;
1504 }
1505 }
1506
1507 snd_pcm_stream_unlock_irq(substream);
1508
1509 _error:
1510 for (i = 0; i < num_drecs; i++) {
1511 d = &drec[i];
1512 runtime = d->substream->runtime;
1513 remove_wait_queue(&runtime->sleep, &d->wait);
1514 runtime->stop_threshold = d->stop_threshold;
1515 }
1516
1517 if (drec != &drec_tmp)
1518 kfree(drec);
1519 snd_power_unlock(card);
1520
1521 return result;
1522 }
1523
1524 /*
1525 * drop ioctl
1526 *
1527 * Immediately put all linked substreams into SETUP state.
1528 */
1529 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1530 {
1531 struct snd_pcm_runtime *runtime;
1532 struct snd_card *card;
1533 int result = 0;
1534
1535 if (PCM_RUNTIME_CHECK(substream))
1536 return -ENXIO;
1537 runtime = substream->runtime;
1538 card = substream->pcm->card;
1539
1540 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1541 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1542 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1543 return -EBADFD;
1544
1545 snd_pcm_stream_lock_irq(substream);
1546 /* resume pause */
1547 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1548 snd_pcm_pause(substream, 0);
1549
1550 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1551 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1552 snd_pcm_stream_unlock_irq(substream);
1553
1554 return result;
1555 }
1556
1557
1558 /* WARNING: Don't forget to fput back the file */
1559 static struct file *snd_pcm_file_fd(int fd)
1560 {
1561 struct file *file;
1562 struct inode *inode;
1563 unsigned int minor;
1564
1565 file = fget(fd);
1566 if (!file)
1567 return NULL;
1568 inode = file->f_path.dentry->d_inode;
1569 if (!S_ISCHR(inode->i_mode) ||
1570 imajor(inode) != snd_major) {
1571 fput(file);
1572 return NULL;
1573 }
1574 minor = iminor(inode);
1575 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1576 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1577 fput(file);
1578 return NULL;
1579 }
1580 return file;
1581 }
1582
1583 /*
1584 * PCM link handling
1585 */
1586 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1587 {
1588 int res = 0;
1589 struct file *file;
1590 struct snd_pcm_file *pcm_file;
1591 struct snd_pcm_substream *substream1;
1592
1593 file = snd_pcm_file_fd(fd);
1594 if (!file)
1595 return -EBADFD;
1596 pcm_file = file->private_data;
1597 substream1 = pcm_file->substream;
1598 down_write(&snd_pcm_link_rwsem);
1599 write_lock_irq(&snd_pcm_link_rwlock);
1600 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1601 substream->runtime->status->state != substream1->runtime->status->state) {
1602 res = -EBADFD;
1603 goto _end;
1604 }
1605 if (snd_pcm_stream_linked(substream1)) {
1606 res = -EALREADY;
1607 goto _end;
1608 }
1609 if (!snd_pcm_stream_linked(substream)) {
1610 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1611 if (substream->group == NULL) {
1612 res = -ENOMEM;
1613 goto _end;
1614 }
1615 spin_lock_init(&substream->group->lock);
1616 INIT_LIST_HEAD(&substream->group->substreams);
1617 list_add_tail(&substream->link_list, &substream->group->substreams);
1618 substream->group->count = 1;
1619 }
1620 list_add_tail(&substream1->link_list, &substream->group->substreams);
1621 substream->group->count++;
1622 substream1->group = substream->group;
1623 _end:
1624 write_unlock_irq(&snd_pcm_link_rwlock);
1625 up_write(&snd_pcm_link_rwsem);
1626 fput(file);
1627 return res;
1628 }
1629
1630 static void relink_to_local(struct snd_pcm_substream *substream)
1631 {
1632 substream->group = &substream->self_group;
1633 INIT_LIST_HEAD(&substream->self_group.substreams);
1634 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1635 }
1636
1637 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1638 {
1639 struct snd_pcm_substream *s;
1640 int res = 0;
1641
1642 down_write(&snd_pcm_link_rwsem);
1643 write_lock_irq(&snd_pcm_link_rwlock);
1644 if (!snd_pcm_stream_linked(substream)) {
1645 res = -EALREADY;
1646 goto _end;
1647 }
1648 list_del(&substream->link_list);
1649 substream->group->count--;
1650 if (substream->group->count == 1) { /* detach the last stream, too */
1651 snd_pcm_group_for_each_entry(s, substream) {
1652 relink_to_local(s);
1653 break;
1654 }
1655 kfree(substream->group);
1656 }
1657 relink_to_local(substream);
1658 _end:
1659 write_unlock_irq(&snd_pcm_link_rwlock);
1660 up_write(&snd_pcm_link_rwsem);
1661 return res;
1662 }
1663
1664 /*
1665 * hw configurator
1666 */
1667 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1668 struct snd_pcm_hw_rule *rule)
1669 {
1670 struct snd_interval t;
1671 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1672 hw_param_interval_c(params, rule->deps[1]), &t);
1673 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1674 }
1675
1676 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1677 struct snd_pcm_hw_rule *rule)
1678 {
1679 struct snd_interval t;
1680 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1681 hw_param_interval_c(params, rule->deps[1]), &t);
1682 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1683 }
1684
1685 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1686 struct snd_pcm_hw_rule *rule)
1687 {
1688 struct snd_interval t;
1689 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1690 hw_param_interval_c(params, rule->deps[1]),
1691 (unsigned long) rule->private, &t);
1692 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1693 }
1694
1695 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1696 struct snd_pcm_hw_rule *rule)
1697 {
1698 struct snd_interval t;
1699 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1700 (unsigned long) rule->private,
1701 hw_param_interval_c(params, rule->deps[1]), &t);
1702 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1703 }
1704
1705 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1706 struct snd_pcm_hw_rule *rule)
1707 {
1708 unsigned int k;
1709 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1710 struct snd_mask m;
1711 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1712 snd_mask_any(&m);
1713 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1714 int bits;
1715 if (! snd_mask_test(mask, k))
1716 continue;
1717 bits = snd_pcm_format_physical_width(k);
1718 if (bits <= 0)
1719 continue; /* ignore invalid formats */
1720 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1721 snd_mask_reset(&m, k);
1722 }
1723 return snd_mask_refine(mask, &m);
1724 }
1725
1726 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1727 struct snd_pcm_hw_rule *rule)
1728 {
1729 struct snd_interval t;
1730 unsigned int k;
1731 t.min = UINT_MAX;
1732 t.max = 0;
1733 t.openmin = 0;
1734 t.openmax = 0;
1735 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1736 int bits;
1737 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1738 continue;
1739 bits = snd_pcm_format_physical_width(k);
1740 if (bits <= 0)
1741 continue; /* ignore invalid formats */
1742 if (t.min > (unsigned)bits)
1743 t.min = bits;
1744 if (t.max < (unsigned)bits)
1745 t.max = bits;
1746 }
1747 t.integer = 1;
1748 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1749 }
1750
1751 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1752 #error "Change this table"
1753 #endif
1754
1755 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1756 48000, 64000, 88200, 96000, 176400, 192000 };
1757
1758 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1759 .count = ARRAY_SIZE(rates),
1760 .list = rates,
1761 };
1762
1763 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1764 struct snd_pcm_hw_rule *rule)
1765 {
1766 struct snd_pcm_hardware *hw = rule->private;
1767 return snd_interval_list(hw_param_interval(params, rule->var),
1768 snd_pcm_known_rates.count,
1769 snd_pcm_known_rates.list, hw->rates);
1770 }
1771
1772 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1773 struct snd_pcm_hw_rule *rule)
1774 {
1775 struct snd_interval t;
1776 struct snd_pcm_substream *substream = rule->private;
1777 t.min = 0;
1778 t.max = substream->buffer_bytes_max;
1779 t.openmin = 0;
1780 t.openmax = 0;
1781 t.integer = 1;
1782 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1783 }
1784
1785 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1786 {
1787 struct snd_pcm_runtime *runtime = substream->runtime;
1788 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1789 int k, err;
1790
1791 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1792 snd_mask_any(constrs_mask(constrs, k));
1793 }
1794
1795 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1796 snd_interval_any(constrs_interval(constrs, k));
1797 }
1798
1799 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1800 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1801 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1802 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1803 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1804
1805 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1806 snd_pcm_hw_rule_format, NULL,
1807 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1808 if (err < 0)
1809 return err;
1810 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1811 snd_pcm_hw_rule_sample_bits, NULL,
1812 SNDRV_PCM_HW_PARAM_FORMAT,
1813 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1814 if (err < 0)
1815 return err;
1816 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1817 snd_pcm_hw_rule_div, NULL,
1818 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1819 if (err < 0)
1820 return err;
1821 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1822 snd_pcm_hw_rule_mul, NULL,
1823 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1824 if (err < 0)
1825 return err;
1826 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1827 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1828 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1829 if (err < 0)
1830 return err;
1831 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1832 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1833 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1834 if (err < 0)
1835 return err;
1836 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1837 snd_pcm_hw_rule_div, NULL,
1838 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1839 if (err < 0)
1840 return err;
1841 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1842 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1843 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1844 if (err < 0)
1845 return err;
1846 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1847 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1848 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1849 if (err < 0)
1850 return err;
1851 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1852 snd_pcm_hw_rule_div, NULL,
1853 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1854 if (err < 0)
1855 return err;
1856 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1857 snd_pcm_hw_rule_div, NULL,
1858 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1859 if (err < 0)
1860 return err;
1861 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1862 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1863 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1864 if (err < 0)
1865 return err;
1866 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1867 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1868 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1869 if (err < 0)
1870 return err;
1871 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1872 snd_pcm_hw_rule_mul, NULL,
1873 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1874 if (err < 0)
1875 return err;
1876 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1877 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1878 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1879 if (err < 0)
1880 return err;
1881 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1882 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1883 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1884 if (err < 0)
1885 return err;
1886 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1887 snd_pcm_hw_rule_muldivk, (void*) 8,
1888 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1889 if (err < 0)
1890 return err;
1891 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1892 snd_pcm_hw_rule_muldivk, (void*) 8,
1893 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1894 if (err < 0)
1895 return err;
1896 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1897 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1898 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1899 if (err < 0)
1900 return err;
1901 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1902 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1903 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1904 if (err < 0)
1905 return err;
1906 return 0;
1907 }
1908
1909 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1910 {
1911 struct snd_pcm_runtime *runtime = substream->runtime;
1912 struct snd_pcm_hardware *hw = &runtime->hw;
1913 int err;
1914 unsigned int mask = 0;
1915
1916 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1917 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1918 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1919 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1920 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1921 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1922 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1923 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1924 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1925 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1926 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1927 }
1928 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1929 if (err < 0)
1930 return err;
1931
1932 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1933 if (err < 0)
1934 return err;
1935
1936 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1937 if (err < 0)
1938 return err;
1939
1940 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1941 hw->channels_min, hw->channels_max);
1942 if (err < 0)
1943 return err;
1944
1945 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1946 hw->rate_min, hw->rate_max);
1947 if (err < 0)
1948 return err;
1949
1950 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1951 hw->period_bytes_min, hw->period_bytes_max);
1952 if (err < 0)
1953 return err;
1954
1955 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1956 hw->periods_min, hw->periods_max);
1957 if (err < 0)
1958 return err;
1959
1960 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1961 hw->period_bytes_min, hw->buffer_bytes_max);
1962 if (err < 0)
1963 return err;
1964
1965 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1966 snd_pcm_hw_rule_buffer_bytes_max, substream,
1967 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1968 if (err < 0)
1969 return err;
1970
1971 /* FIXME: remove */
1972 if (runtime->dma_bytes) {
1973 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1974 if (err < 0)
1975 return -EINVAL;
1976 }
1977
1978 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1979 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1980 snd_pcm_hw_rule_rate, hw,
1981 SNDRV_PCM_HW_PARAM_RATE, -1);
1982 if (err < 0)
1983 return err;
1984 }
1985
1986 /* FIXME: this belong to lowlevel */
1987 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1988
1989 return 0;
1990 }
1991
1992 static void pcm_release_private(struct snd_pcm_substream *substream)
1993 {
1994 snd_pcm_unlink(substream);
1995 }
1996
1997 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1998 {
1999 substream->ref_count--;
2000 if (substream->ref_count > 0)
2001 return;
2002
2003 snd_pcm_drop(substream);
2004 if (substream->hw_opened) {
2005 if (substream->ops->hw_free != NULL)
2006 substream->ops->hw_free(substream);
2007 substream->ops->close(substream);
2008 substream->hw_opened = 0;
2009 }
2010 if (substream->pcm_release) {
2011 substream->pcm_release(substream);
2012 substream->pcm_release = NULL;
2013 }
2014 snd_pcm_detach_substream(substream);
2015 }
2016
2017 EXPORT_SYMBOL(snd_pcm_release_substream);
2018
2019 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2020 struct file *file,
2021 struct snd_pcm_substream **rsubstream)
2022 {
2023 struct snd_pcm_substream *substream;
2024 int err;
2025
2026 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2027 if (err < 0)
2028 return err;
2029 if (substream->ref_count > 1) {
2030 *rsubstream = substream;
2031 return 0;
2032 }
2033
2034 err = snd_pcm_hw_constraints_init(substream);
2035 if (err < 0) {
2036 snd_printd("snd_pcm_hw_constraints_init failed\n");
2037 goto error;
2038 }
2039
2040 if ((err = substream->ops->open(substream)) < 0)
2041 goto error;
2042
2043 substream->hw_opened = 1;
2044
2045 err = snd_pcm_hw_constraints_complete(substream);
2046 if (err < 0) {
2047 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2048 goto error;
2049 }
2050
2051 *rsubstream = substream;
2052 return 0;
2053
2054 error:
2055 snd_pcm_release_substream(substream);
2056 return err;
2057 }
2058
2059 EXPORT_SYMBOL(snd_pcm_open_substream);
2060
2061 static int snd_pcm_open_file(struct file *file,
2062 struct snd_pcm *pcm,
2063 int stream,
2064 struct snd_pcm_file **rpcm_file)
2065 {
2066 struct snd_pcm_file *pcm_file;
2067 struct snd_pcm_substream *substream;
2068 struct snd_pcm_str *str;
2069 int err;
2070
2071 if (rpcm_file)
2072 *rpcm_file = NULL;
2073
2074 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2075 if (err < 0)
2076 return err;
2077
2078 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2079 if (pcm_file == NULL) {
2080 snd_pcm_release_substream(substream);
2081 return -ENOMEM;
2082 }
2083 pcm_file->substream = substream;
2084 if (substream->ref_count == 1) {
2085 str = substream->pstr;
2086 substream->file = pcm_file;
2087 substream->pcm_release = pcm_release_private;
2088 }
2089 file->private_data = pcm_file;
2090 if (rpcm_file)
2091 *rpcm_file = pcm_file;
2092 return 0;
2093 }
2094
2095 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2096 {
2097 struct snd_pcm *pcm;
2098
2099 pcm = snd_lookup_minor_data(iminor(inode),
2100 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2101 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2102 }
2103
2104 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2105 {
2106 struct snd_pcm *pcm;
2107
2108 pcm = snd_lookup_minor_data(iminor(inode),
2109 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2110 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2111 }
2112
2113 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2114 {
2115 int err;
2116 struct snd_pcm_file *pcm_file;
2117 wait_queue_t wait;
2118
2119 if (pcm == NULL) {
2120 err = -ENODEV;
2121 goto __error1;
2122 }
2123 err = snd_card_file_add(pcm->card, file);
2124 if (err < 0)
2125 goto __error1;
2126 if (!try_module_get(pcm->card->module)) {
2127 err = -EFAULT;
2128 goto __error2;
2129 }
2130 init_waitqueue_entry(&wait, current);
2131 add_wait_queue(&pcm->open_wait, &wait);
2132 mutex_lock(&pcm->open_mutex);
2133 while (1) {
2134 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2135 if (err >= 0)
2136 break;
2137 if (err == -EAGAIN) {
2138 if (file->f_flags & O_NONBLOCK) {
2139 err = -EBUSY;
2140 break;
2141 }
2142 } else
2143 break;
2144 set_current_state(TASK_INTERRUPTIBLE);
2145 mutex_unlock(&pcm->open_mutex);
2146 schedule();
2147 mutex_lock(&pcm->open_mutex);
2148 if (signal_pending(current)) {
2149 err = -ERESTARTSYS;
2150 break;
2151 }
2152 }
2153 remove_wait_queue(&pcm->open_wait, &wait);
2154 mutex_unlock(&pcm->open_mutex);
2155 if (err < 0)
2156 goto __error;
2157 return err;
2158
2159 __error:
2160 module_put(pcm->card->module);
2161 __error2:
2162 snd_card_file_remove(pcm->card, file);
2163 __error1:
2164 return err;
2165 }
2166
2167 static int snd_pcm_release(struct inode *inode, struct file *file)
2168 {
2169 struct snd_pcm *pcm;
2170 struct snd_pcm_substream *substream;
2171 struct snd_pcm_file *pcm_file;
2172
2173 pcm_file = file->private_data;
2174 substream = pcm_file->substream;
2175 if (snd_BUG_ON(!substream))
2176 return -ENXIO;
2177 pcm = substream->pcm;
2178 mutex_lock(&pcm->open_mutex);
2179 snd_pcm_release_substream(substream);
2180 kfree(pcm_file);
2181 mutex_unlock(&pcm->open_mutex);
2182 wake_up(&pcm->open_wait);
2183 module_put(pcm->card->module);
2184 snd_card_file_remove(pcm->card, file);
2185 return 0;
2186 }
2187
2188 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2189 snd_pcm_uframes_t frames)
2190 {
2191 struct snd_pcm_runtime *runtime = substream->runtime;
2192 snd_pcm_sframes_t appl_ptr;
2193 snd_pcm_sframes_t ret;
2194 snd_pcm_sframes_t hw_avail;
2195
2196 if (frames == 0)
2197 return 0;
2198
2199 snd_pcm_stream_lock_irq(substream);
2200 switch (runtime->status->state) {
2201 case SNDRV_PCM_STATE_PREPARED:
2202 break;
2203 case SNDRV_PCM_STATE_DRAINING:
2204 case SNDRV_PCM_STATE_RUNNING:
2205 if (snd_pcm_update_hw_ptr(substream) >= 0)
2206 break;
2207 /* Fall through */
2208 case SNDRV_PCM_STATE_XRUN:
2209 ret = -EPIPE;
2210 goto __end;
2211 default:
2212 ret = -EBADFD;
2213 goto __end;
2214 }
2215
2216 hw_avail = snd_pcm_playback_hw_avail(runtime);
2217 if (hw_avail <= 0) {
2218 ret = 0;
2219 goto __end;
2220 }
2221 if (frames > (snd_pcm_uframes_t)hw_avail)
2222 frames = hw_avail;
2223 appl_ptr = runtime->control->appl_ptr - frames;
2224 if (appl_ptr < 0)
2225 appl_ptr += runtime->boundary;
2226 runtime->control->appl_ptr = appl_ptr;
2227 ret = frames;
2228 __end:
2229 snd_pcm_stream_unlock_irq(substream);
2230 return ret;
2231 }
2232
2233 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2234 snd_pcm_uframes_t frames)
2235 {
2236 struct snd_pcm_runtime *runtime = substream->runtime;
2237 snd_pcm_sframes_t appl_ptr;
2238 snd_pcm_sframes_t ret;
2239 snd_pcm_sframes_t hw_avail;
2240
2241 if (frames == 0)
2242 return 0;
2243
2244 snd_pcm_stream_lock_irq(substream);
2245 switch (runtime->status->state) {
2246 case SNDRV_PCM_STATE_PREPARED:
2247 case SNDRV_PCM_STATE_DRAINING:
2248 break;
2249 case SNDRV_PCM_STATE_RUNNING:
2250 if (snd_pcm_update_hw_ptr(substream) >= 0)
2251 break;
2252 /* Fall through */
2253 case SNDRV_PCM_STATE_XRUN:
2254 ret = -EPIPE;
2255 goto __end;
2256 default:
2257 ret = -EBADFD;
2258 goto __end;
2259 }
2260
2261 hw_avail = snd_pcm_capture_hw_avail(runtime);
2262 if (hw_avail <= 0) {
2263 ret = 0;
2264 goto __end;
2265 }
2266 if (frames > (snd_pcm_uframes_t)hw_avail)
2267 frames = hw_avail;
2268 appl_ptr = runtime->control->appl_ptr - frames;
2269 if (appl_ptr < 0)
2270 appl_ptr += runtime->boundary;
2271 runtime->control->appl_ptr = appl_ptr;
2272 ret = frames;
2273 __end:
2274 snd_pcm_stream_unlock_irq(substream);
2275 return ret;
2276 }
2277
2278 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2279 snd_pcm_uframes_t frames)
2280 {
2281 struct snd_pcm_runtime *runtime = substream->runtime;
2282 snd_pcm_sframes_t appl_ptr;
2283 snd_pcm_sframes_t ret;
2284 snd_pcm_sframes_t avail;
2285
2286 if (frames == 0)
2287 return 0;
2288
2289 snd_pcm_stream_lock_irq(substream);
2290 switch (runtime->status->state) {
2291 case SNDRV_PCM_STATE_PREPARED:
2292 case SNDRV_PCM_STATE_PAUSED:
2293 break;
2294 case SNDRV_PCM_STATE_DRAINING:
2295 case SNDRV_PCM_STATE_RUNNING:
2296 if (snd_pcm_update_hw_ptr(substream) >= 0)
2297 break;
2298 /* Fall through */
2299 case SNDRV_PCM_STATE_XRUN:
2300 ret = -EPIPE;
2301 goto __end;
2302 default:
2303 ret = -EBADFD;
2304 goto __end;
2305 }
2306
2307 avail = snd_pcm_playback_avail(runtime);
2308 if (avail <= 0) {
2309 ret = 0;
2310 goto __end;
2311 }
2312 if (frames > (snd_pcm_uframes_t)avail)
2313 frames = avail;
2314 appl_ptr = runtime->control->appl_ptr + frames;
2315 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2316 appl_ptr -= runtime->boundary;
2317 runtime->control->appl_ptr = appl_ptr;
2318 ret = frames;
2319 __end:
2320 snd_pcm_stream_unlock_irq(substream);
2321 return ret;
2322 }
2323
2324 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2325 snd_pcm_uframes_t frames)
2326 {
2327 struct snd_pcm_runtime *runtime = substream->runtime;
2328 snd_pcm_sframes_t appl_ptr;
2329 snd_pcm_sframes_t ret;
2330 snd_pcm_sframes_t avail;
2331
2332 if (frames == 0)
2333 return 0;
2334
2335 snd_pcm_stream_lock_irq(substream);
2336 switch (runtime->status->state) {
2337 case SNDRV_PCM_STATE_PREPARED:
2338 case SNDRV_PCM_STATE_DRAINING:
2339 case SNDRV_PCM_STATE_PAUSED:
2340 break;
2341 case SNDRV_PCM_STATE_RUNNING:
2342 if (snd_pcm_update_hw_ptr(substream) >= 0)
2343 break;
2344 /* Fall through */
2345 case SNDRV_PCM_STATE_XRUN:
2346 ret = -EPIPE;
2347 goto __end;
2348 default:
2349 ret = -EBADFD;
2350 goto __end;
2351 }
2352
2353 avail = snd_pcm_capture_avail(runtime);
2354 if (avail <= 0) {
2355 ret = 0;
2356 goto __end;
2357 }
2358 if (frames > (snd_pcm_uframes_t)avail)
2359 frames = avail;
2360 appl_ptr = runtime->control->appl_ptr + frames;
2361 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2362 appl_ptr -= runtime->boundary;
2363 runtime->control->appl_ptr = appl_ptr;
2364 ret = frames;
2365 __end:
2366 snd_pcm_stream_unlock_irq(substream);
2367 return ret;
2368 }
2369
2370 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2371 {
2372 struct snd_pcm_runtime *runtime = substream->runtime;
2373 int err;
2374
2375 snd_pcm_stream_lock_irq(substream);
2376 switch (runtime->status->state) {
2377 case SNDRV_PCM_STATE_DRAINING:
2378 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2379 goto __badfd;
2380 case SNDRV_PCM_STATE_RUNNING:
2381 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2382 break;
2383 /* Fall through */
2384 case SNDRV_PCM_STATE_PREPARED:
2385 case SNDRV_PCM_STATE_SUSPENDED:
2386 err = 0;
2387 break;
2388 case SNDRV_PCM_STATE_XRUN:
2389 err = -EPIPE;
2390 break;
2391 default:
2392 __badfd:
2393 err = -EBADFD;
2394 break;
2395 }
2396 snd_pcm_stream_unlock_irq(substream);
2397 return err;
2398 }
2399
2400 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2401 snd_pcm_sframes_t __user *res)
2402 {
2403 struct snd_pcm_runtime *runtime = substream->runtime;
2404 int err;
2405 snd_pcm_sframes_t n = 0;
2406
2407 snd_pcm_stream_lock_irq(substream);
2408 switch (runtime->status->state) {
2409 case SNDRV_PCM_STATE_DRAINING:
2410 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2411 goto __badfd;
2412 case SNDRV_PCM_STATE_RUNNING:
2413 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2414 break;
2415 /* Fall through */
2416 case SNDRV_PCM_STATE_PREPARED:
2417 case SNDRV_PCM_STATE_SUSPENDED:
2418 err = 0;
2419 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2420 n = snd_pcm_playback_hw_avail(runtime);
2421 else
2422 n = snd_pcm_capture_avail(runtime);
2423 n += runtime->delay;
2424 break;
2425 case SNDRV_PCM_STATE_XRUN:
2426 err = -EPIPE;
2427 break;
2428 default:
2429 __badfd:
2430 err = -EBADFD;
2431 break;
2432 }
2433 snd_pcm_stream_unlock_irq(substream);
2434 if (!err)
2435 if (put_user(n, res))
2436 err = -EFAULT;
2437 return err;
2438 }
2439
2440 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2441 struct snd_pcm_sync_ptr __user *_sync_ptr)
2442 {
2443 struct snd_pcm_runtime *runtime = substream->runtime;
2444 struct snd_pcm_sync_ptr sync_ptr;
2445 volatile struct snd_pcm_mmap_status *status;
2446 volatile struct snd_pcm_mmap_control *control;
2447 int err;
2448
2449 memset(&sync_ptr, 0, sizeof(sync_ptr));
2450 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2451 return -EFAULT;
2452 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2453 return -EFAULT;
2454 status = runtime->status;
2455 control = runtime->control;
2456 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2457 err = snd_pcm_hwsync(substream);
2458 if (err < 0)
2459 return err;
2460 }
2461 snd_pcm_stream_lock_irq(substream);
2462 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2463 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2464 else
2465 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2466 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2467 control->avail_min = sync_ptr.c.control.avail_min;
2468 else
2469 sync_ptr.c.control.avail_min = control->avail_min;
2470 sync_ptr.s.status.state = status->state;
2471 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2472 sync_ptr.s.status.tstamp = status->tstamp;
2473 sync_ptr.s.status.suspended_state = status->suspended_state;
2474 snd_pcm_stream_unlock_irq(substream);
2475 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2476 return -EFAULT;
2477 return 0;
2478 }
2479
2480 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2481 {
2482 struct snd_pcm_runtime *runtime = substream->runtime;
2483 int arg;
2484
2485 if (get_user(arg, _arg))
2486 return -EFAULT;
2487 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2488 return -EINVAL;
2489 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2490 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2491 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2492 return 0;
2493 }
2494
2495 static int snd_pcm_common_ioctl1(struct file *file,
2496 struct snd_pcm_substream *substream,
2497 unsigned int cmd, void __user *arg)
2498 {
2499 switch (cmd) {
2500 case SNDRV_PCM_IOCTL_PVERSION:
2501 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2502 case SNDRV_PCM_IOCTL_INFO:
2503 return snd_pcm_info_user(substream, arg);
2504 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2505 return 0;
2506 case SNDRV_PCM_IOCTL_TTSTAMP:
2507 return snd_pcm_tstamp(substream, arg);
2508 case SNDRV_PCM_IOCTL_HW_REFINE:
2509 return snd_pcm_hw_refine_user(substream, arg);
2510 case SNDRV_PCM_IOCTL_HW_PARAMS:
2511 return snd_pcm_hw_params_user(substream, arg);
2512 case SNDRV_PCM_IOCTL_HW_FREE:
2513 return snd_pcm_hw_free(substream);
2514 case SNDRV_PCM_IOCTL_SW_PARAMS:
2515 return snd_pcm_sw_params_user(substream, arg);
2516 case SNDRV_PCM_IOCTL_STATUS:
2517 return snd_pcm_status_user(substream, arg);
2518 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2519 return snd_pcm_channel_info_user(substream, arg);
2520 case SNDRV_PCM_IOCTL_PREPARE:
2521 return snd_pcm_prepare(substream, file);
2522 case SNDRV_PCM_IOCTL_RESET:
2523 return snd_pcm_reset(substream);
2524 case SNDRV_PCM_IOCTL_START:
2525 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2526 case SNDRV_PCM_IOCTL_LINK:
2527 return snd_pcm_link(substream, (int)(unsigned long) arg);
2528 case SNDRV_PCM_IOCTL_UNLINK:
2529 return snd_pcm_unlink(substream);
2530 case SNDRV_PCM_IOCTL_RESUME:
2531 return snd_pcm_resume(substream);
2532 case SNDRV_PCM_IOCTL_XRUN:
2533 return snd_pcm_xrun(substream);
2534 case SNDRV_PCM_IOCTL_HWSYNC:
2535 return snd_pcm_hwsync(substream);
2536 case SNDRV_PCM_IOCTL_DELAY:
2537 return snd_pcm_delay(substream, arg);
2538 case SNDRV_PCM_IOCTL_SYNC_PTR:
2539 return snd_pcm_sync_ptr(substream, arg);
2540 #ifdef CONFIG_SND_SUPPORT_OLD_API
2541 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2542 return snd_pcm_hw_refine_old_user(substream, arg);
2543 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2544 return snd_pcm_hw_params_old_user(substream, arg);
2545 #endif
2546 case SNDRV_PCM_IOCTL_DRAIN:
2547 return snd_pcm_drain(substream);
2548 case SNDRV_PCM_IOCTL_DROP:
2549 return snd_pcm_drop(substream);
2550 case SNDRV_PCM_IOCTL_PAUSE:
2551 {
2552 int res;
2553 snd_pcm_stream_lock_irq(substream);
2554 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2555 snd_pcm_stream_unlock_irq(substream);
2556 return res;
2557 }
2558 }
2559 snd_printd("unknown ioctl = 0x%x\n", cmd);
2560 return -ENOTTY;
2561 }
2562
2563 static int snd_pcm_playback_ioctl1(struct file *file,
2564 struct snd_pcm_substream *substream,
2565 unsigned int cmd, void __user *arg)
2566 {
2567 if (snd_BUG_ON(!substream))
2568 return -ENXIO;
2569 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2570 return -EINVAL;
2571 switch (cmd) {
2572 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2573 {
2574 struct snd_xferi xferi;
2575 struct snd_xferi __user *_xferi = arg;
2576 struct snd_pcm_runtime *runtime = substream->runtime;
2577 snd_pcm_sframes_t result;
2578 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2579 return -EBADFD;
2580 if (put_user(0, &_xferi->result))
2581 return -EFAULT;
2582 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2583 return -EFAULT;
2584 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2585 __put_user(result, &_xferi->result);
2586 return result < 0 ? result : 0;
2587 }
2588 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2589 {
2590 struct snd_xfern xfern;
2591 struct snd_xfern __user *_xfern = arg;
2592 struct snd_pcm_runtime *runtime = substream->runtime;
2593 void __user **bufs;
2594 snd_pcm_sframes_t result;
2595 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2596 return -EBADFD;
2597 if (runtime->channels > 128)
2598 return -EINVAL;
2599 if (put_user(0, &_xfern->result))
2600 return -EFAULT;
2601 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2602 return -EFAULT;
2603
2604 bufs = memdup_user(xfern.bufs,
2605 sizeof(void *) * runtime->channels);
2606 if (IS_ERR(bufs))
2607 return PTR_ERR(bufs);
2608 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2609 kfree(bufs);
2610 __put_user(result, &_xfern->result);
2611 return result < 0 ? result : 0;
2612 }
2613 case SNDRV_PCM_IOCTL_REWIND:
2614 {
2615 snd_pcm_uframes_t frames;
2616 snd_pcm_uframes_t __user *_frames = arg;
2617 snd_pcm_sframes_t result;
2618 if (get_user(frames, _frames))
2619 return -EFAULT;
2620 if (put_user(0, _frames))
2621 return -EFAULT;
2622 result = snd_pcm_playback_rewind(substream, frames);
2623 __put_user(result, _frames);
2624 return result < 0 ? result : 0;
2625 }
2626 case SNDRV_PCM_IOCTL_FORWARD:
2627 {
2628 snd_pcm_uframes_t frames;
2629 snd_pcm_uframes_t __user *_frames = arg;
2630 snd_pcm_sframes_t result;
2631 if (get_user(frames, _frames))
2632 return -EFAULT;
2633 if (put_user(0, _frames))
2634 return -EFAULT;
2635 result = snd_pcm_playback_forward(substream, frames);
2636 __put_user(result, _frames);
2637 return result < 0 ? result : 0;
2638 }
2639 }
2640 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2641 }
2642
2643 static int snd_pcm_capture_ioctl1(struct file *file,
2644 struct snd_pcm_substream *substream,
2645 unsigned int cmd, void __user *arg)
2646 {
2647 if (snd_BUG_ON(!substream))
2648 return -ENXIO;
2649 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2650 return -EINVAL;
2651 switch (cmd) {
2652 case SNDRV_PCM_IOCTL_READI_FRAMES:
2653 {
2654 struct snd_xferi xferi;
2655 struct snd_xferi __user *_xferi = arg;
2656 struct snd_pcm_runtime *runtime = substream->runtime;
2657 snd_pcm_sframes_t result;
2658 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2659 return -EBADFD;
2660 if (put_user(0, &_xferi->result))
2661 return -EFAULT;
2662 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2663 return -EFAULT;
2664 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2665 __put_user(result, &_xferi->result);
2666 return result < 0 ? result : 0;
2667 }
2668 case SNDRV_PCM_IOCTL_READN_FRAMES:
2669 {
2670 struct snd_xfern xfern;
2671 struct snd_xfern __user *_xfern = arg;
2672 struct snd_pcm_runtime *runtime = substream->runtime;
2673 void *bufs;
2674 snd_pcm_sframes_t result;
2675 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2676 return -EBADFD;
2677 if (runtime->channels > 128)
2678 return -EINVAL;
2679 if (put_user(0, &_xfern->result))
2680 return -EFAULT;
2681 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2682 return -EFAULT;
2683
2684 bufs = memdup_user(xfern.bufs,
2685 sizeof(void *) * runtime->channels);
2686 if (IS_ERR(bufs))
2687 return PTR_ERR(bufs);
2688 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2689 kfree(bufs);
2690 __put_user(result, &_xfern->result);
2691 return result < 0 ? result : 0;
2692 }
2693 case SNDRV_PCM_IOCTL_REWIND:
2694 {
2695 snd_pcm_uframes_t frames;
2696 snd_pcm_uframes_t __user *_frames = arg;
2697 snd_pcm_sframes_t result;
2698 if (get_user(frames, _frames))
2699 return -EFAULT;
2700 if (put_user(0, _frames))
2701 return -EFAULT;
2702 result = snd_pcm_capture_rewind(substream, frames);
2703 __put_user(result, _frames);
2704 return result < 0 ? result : 0;
2705 }
2706 case SNDRV_PCM_IOCTL_FORWARD:
2707 {
2708 snd_pcm_uframes_t frames;
2709 snd_pcm_uframes_t __user *_frames = arg;
2710 snd_pcm_sframes_t result;
2711 if (get_user(frames, _frames))
2712 return -EFAULT;
2713 if (put_user(0, _frames))
2714 return -EFAULT;
2715 result = snd_pcm_capture_forward(substream, frames);
2716 __put_user(result, _frames);
2717 return result < 0 ? result : 0;
2718 }
2719 }
2720 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2721 }
2722
2723 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2724 unsigned long arg)
2725 {
2726 struct snd_pcm_file *pcm_file;
2727
2728 pcm_file = file->private_data;
2729
2730 if (((cmd >> 8) & 0xff) != 'A')
2731 return -ENOTTY;
2732
2733 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2734 (void __user *)arg);
2735 }
2736
2737 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2738 unsigned long arg)
2739 {
2740 struct snd_pcm_file *pcm_file;
2741
2742 pcm_file = file->private_data;
2743
2744 if (((cmd >> 8) & 0xff) != 'A')
2745 return -ENOTTY;
2746
2747 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2748 (void __user *)arg);
2749 }
2750
2751 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2752 unsigned int cmd, void *arg)
2753 {
2754 mm_segment_t fs;
2755 int result;
2756
2757 fs = snd_enter_user();
2758 switch (substream->stream) {
2759 case SNDRV_PCM_STREAM_PLAYBACK:
2760 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2761 (void __user *)arg);
2762 break;
2763 case SNDRV_PCM_STREAM_CAPTURE:
2764 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2765 (void __user *)arg);
2766 break;
2767 default:
2768 result = -EINVAL;
2769 break;
2770 }
2771 snd_leave_user(fs);
2772 return result;
2773 }
2774
2775 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2776
2777 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2778 loff_t * offset)
2779 {
2780 struct snd_pcm_file *pcm_file;
2781 struct snd_pcm_substream *substream;
2782 struct snd_pcm_runtime *runtime;
2783 snd_pcm_sframes_t result;
2784
2785 pcm_file = file->private_data;
2786 substream = pcm_file->substream;
2787 if (PCM_RUNTIME_CHECK(substream))
2788 return -ENXIO;
2789 runtime = substream->runtime;
2790 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2791 return -EBADFD;
2792 if (!frame_aligned(runtime, count))
2793 return -EINVAL;
2794 count = bytes_to_frames(runtime, count);
2795 result = snd_pcm_lib_read(substream, buf, count);
2796 if (result > 0)
2797 result = frames_to_bytes(runtime, result);
2798 return result;
2799 }
2800
2801 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2802 size_t count, loff_t * offset)
2803 {
2804 struct snd_pcm_file *pcm_file;
2805 struct snd_pcm_substream *substream;
2806 struct snd_pcm_runtime *runtime;
2807 snd_pcm_sframes_t result;
2808
2809 pcm_file = file->private_data;
2810 substream = pcm_file->substream;
2811 if (PCM_RUNTIME_CHECK(substream))
2812 return -ENXIO;
2813 runtime = substream->runtime;
2814 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2815 return -EBADFD;
2816 if (!frame_aligned(runtime, count))
2817 return -EINVAL;
2818 count = bytes_to_frames(runtime, count);
2819 result = snd_pcm_lib_write(substream, buf, count);
2820 if (result > 0)
2821 result = frames_to_bytes(runtime, result);
2822 return result;
2823 }
2824
2825 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2826 unsigned long nr_segs, loff_t pos)
2827
2828 {
2829 struct snd_pcm_file *pcm_file;
2830 struct snd_pcm_substream *substream;
2831 struct snd_pcm_runtime *runtime;
2832 snd_pcm_sframes_t result;
2833 unsigned long i;
2834 void __user **bufs;
2835 snd_pcm_uframes_t frames;
2836
2837 pcm_file = iocb->ki_filp->private_data;
2838 substream = pcm_file->substream;
2839 if (PCM_RUNTIME_CHECK(substream))
2840 return -ENXIO;
2841 runtime = substream->runtime;
2842 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2843 return -EBADFD;
2844 if (nr_segs > 1024 || nr_segs != runtime->channels)
2845 return -EINVAL;
2846 if (!frame_aligned(runtime, iov->iov_len))
2847 return -EINVAL;
2848 frames = bytes_to_samples(runtime, iov->iov_len);
2849 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2850 if (bufs == NULL)
2851 return -ENOMEM;
2852 for (i = 0; i < nr_segs; ++i)
2853 bufs[i] = iov[i].iov_base;
2854 result = snd_pcm_lib_readv(substream, bufs, frames);
2855 if (result > 0)
2856 result = frames_to_bytes(runtime, result);
2857 kfree(bufs);
2858 return result;
2859 }
2860
2861 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2862 unsigned long nr_segs, loff_t pos)
2863 {
2864 struct snd_pcm_file *pcm_file;
2865 struct snd_pcm_substream *substream;
2866 struct snd_pcm_runtime *runtime;
2867 snd_pcm_sframes_t result;
2868 unsigned long i;
2869 void __user **bufs;
2870 snd_pcm_uframes_t frames;
2871
2872 pcm_file = iocb->ki_filp->private_data;
2873 substream = pcm_file->substream;
2874 if (PCM_RUNTIME_CHECK(substream))
2875 return -ENXIO;
2876 runtime = substream->runtime;
2877 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2878 return -EBADFD;
2879 if (nr_segs > 128 || nr_segs != runtime->channels ||
2880 !frame_aligned(runtime, iov->iov_len))
2881 return -EINVAL;
2882 frames = bytes_to_samples(runtime, iov->iov_len);
2883 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2884 if (bufs == NULL)
2885 return -ENOMEM;
2886 for (i = 0; i < nr_segs; ++i)
2887 bufs[i] = iov[i].iov_base;
2888 result = snd_pcm_lib_writev(substream, bufs, frames);
2889 if (result > 0)
2890 result = frames_to_bytes(runtime, result);
2891 kfree(bufs);
2892 return result;
2893 }
2894
2895 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2896 {
2897 struct snd_pcm_file *pcm_file;
2898 struct snd_pcm_substream *substream;
2899 struct snd_pcm_runtime *runtime;
2900 unsigned int mask;
2901 snd_pcm_uframes_t avail;
2902
2903 pcm_file = file->private_data;
2904
2905 substream = pcm_file->substream;
2906 if (PCM_RUNTIME_CHECK(substream))
2907 return -ENXIO;
2908 runtime = substream->runtime;
2909
2910 poll_wait(file, &runtime->sleep, wait);
2911
2912 snd_pcm_stream_lock_irq(substream);
2913 avail = snd_pcm_playback_avail(runtime);
2914 switch (runtime->status->state) {
2915 case SNDRV_PCM_STATE_RUNNING:
2916 case SNDRV_PCM_STATE_PREPARED:
2917 case SNDRV_PCM_STATE_PAUSED:
2918 if (avail >= runtime->control->avail_min) {
2919 mask = POLLOUT | POLLWRNORM;
2920 break;
2921 }
2922 /* Fall through */
2923 case SNDRV_PCM_STATE_DRAINING:
2924 mask = 0;
2925 break;
2926 default:
2927 mask = POLLOUT | POLLWRNORM | POLLERR;
2928 break;
2929 }
2930 snd_pcm_stream_unlock_irq(substream);
2931 return mask;
2932 }
2933
2934 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2935 {
2936 struct snd_pcm_file *pcm_file;
2937 struct snd_pcm_substream *substream;
2938 struct snd_pcm_runtime *runtime;
2939 unsigned int mask;
2940 snd_pcm_uframes_t avail;
2941
2942 pcm_file = file->private_data;
2943
2944 substream = pcm_file->substream;
2945 if (PCM_RUNTIME_CHECK(substream))
2946 return -ENXIO;
2947 runtime = substream->runtime;
2948
2949 poll_wait(file, &runtime->sleep, wait);
2950
2951 snd_pcm_stream_lock_irq(substream);
2952 avail = snd_pcm_capture_avail(runtime);
2953 switch (runtime->status->state) {
2954 case SNDRV_PCM_STATE_RUNNING:
2955 case SNDRV_PCM_STATE_PREPARED:
2956 case SNDRV_PCM_STATE_PAUSED:
2957 if (avail >= runtime->control->avail_min) {
2958 mask = POLLIN | POLLRDNORM;
2959 break;
2960 }
2961 mask = 0;
2962 break;
2963 case SNDRV_PCM_STATE_DRAINING:
2964 if (avail > 0) {
2965 mask = POLLIN | POLLRDNORM;
2966 break;
2967 }
2968 /* Fall through */
2969 default:
2970 mask = POLLIN | POLLRDNORM | POLLERR;
2971 break;
2972 }
2973 snd_pcm_stream_unlock_irq(substream);
2974 return mask;
2975 }
2976
2977 /*
2978 * mmap support
2979 */
2980
2981 /*
2982 * Only on coherent architectures, we can mmap the status and the control records
2983 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2984 */
2985 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2986 /*
2987 * mmap status record
2988 */
2989 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2990 struct vm_fault *vmf)
2991 {
2992 struct snd_pcm_substream *substream = area->vm_private_data;
2993 struct snd_pcm_runtime *runtime;
2994
2995 if (substream == NULL)
2996 return VM_FAULT_SIGBUS;
2997 runtime = substream->runtime;
2998 vmf->page = virt_to_page(runtime->status);
2999 get_page(vmf->page);
3000 return 0;
3001 }
3002
3003 static struct vm_operations_struct snd_pcm_vm_ops_status =
3004 {
3005 .fault = snd_pcm_mmap_status_fault,
3006 };
3007
3008 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3009 struct vm_area_struct *area)
3010 {
3011 struct snd_pcm_runtime *runtime;
3012 long size;
3013 if (!(area->vm_flags & VM_READ))
3014 return -EINVAL;
3015 runtime = substream->runtime;
3016 size = area->vm_end - area->vm_start;
3017 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3018 return -EINVAL;
3019 area->vm_ops = &snd_pcm_vm_ops_status;
3020 area->vm_private_data = substream;
3021 area->vm_flags |= VM_RESERVED;
3022 return 0;
3023 }
3024
3025 /*
3026 * mmap control record
3027 */
3028 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3029 struct vm_fault *vmf)
3030 {
3031 struct snd_pcm_substream *substream = area->vm_private_data;
3032 struct snd_pcm_runtime *runtime;
3033
3034 if (substream == NULL)
3035 return VM_FAULT_SIGBUS;
3036 runtime = substream->runtime;
3037 vmf->page = virt_to_page(runtime->control);
3038 get_page(vmf->page);
3039 return 0;
3040 }
3041
3042 static struct vm_operations_struct snd_pcm_vm_ops_control =
3043 {
3044 .fault = snd_pcm_mmap_control_fault,
3045 };
3046
3047 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3048 struct vm_area_struct *area)
3049 {
3050 struct snd_pcm_runtime *runtime;
3051 long size;
3052 if (!(area->vm_flags & VM_READ))
3053 return -EINVAL;
3054 runtime = substream->runtime;
3055 size = area->vm_end - area->vm_start;
3056 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3057 return -EINVAL;
3058 area->vm_ops = &snd_pcm_vm_ops_control;
3059 area->vm_private_data = substream;
3060 area->vm_flags |= VM_RESERVED;
3061 return 0;
3062 }
3063 #else /* ! coherent mmap */
3064 /*
3065 * don't support mmap for status and control records.
3066 */
3067 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3068 struct vm_area_struct *area)
3069 {
3070 return -ENXIO;
3071 }
3072 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3073 struct vm_area_struct *area)
3074 {
3075 return -ENXIO;
3076 }
3077 #endif /* coherent mmap */
3078
3079 /*
3080 * fault callback for mmapping a RAM page
3081 */
3082 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3083 struct vm_fault *vmf)
3084 {
3085 struct snd_pcm_substream *substream = area->vm_private_data;
3086 struct snd_pcm_runtime *runtime;
3087 unsigned long offset;
3088 struct page * page;
3089 void *vaddr;
3090 size_t dma_bytes;
3091
3092 if (substream == NULL)
3093 return VM_FAULT_SIGBUS;
3094 runtime = substream->runtime;
3095 offset = vmf->pgoff << PAGE_SHIFT;
3096 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3097 if (offset > dma_bytes - PAGE_SIZE)
3098 return VM_FAULT_SIGBUS;
3099 if (substream->ops->page) {
3100 page = substream->ops->page(substream, offset);
3101 if (!page)
3102 return VM_FAULT_SIGBUS;
3103 } else {
3104 vaddr = runtime->dma_area + offset;
3105 page = virt_to_page(vaddr);
3106 }
3107 get_page(page);
3108 vmf->page = page;
3109 return 0;
3110 }
3111
3112 static struct vm_operations_struct snd_pcm_vm_ops_data =
3113 {
3114 .open = snd_pcm_mmap_data_open,
3115 .close = snd_pcm_mmap_data_close,
3116 .fault = snd_pcm_mmap_data_fault,
3117 };
3118
3119 /*
3120 * mmap the DMA buffer on RAM
3121 */
3122 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3123 struct vm_area_struct *area)
3124 {
3125 area->vm_ops = &snd_pcm_vm_ops_data;
3126 area->vm_private_data = substream;
3127 area->vm_flags |= VM_RESERVED;
3128 atomic_inc(&substream->mmap_count);
3129 return 0;
3130 }
3131
3132 /*
3133 * mmap the DMA buffer on I/O memory area
3134 */
3135 #if SNDRV_PCM_INFO_MMAP_IOMEM
3136 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3137 {
3138 .open = snd_pcm_mmap_data_open,
3139 .close = snd_pcm_mmap_data_close,
3140 };
3141
3142 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3143 struct vm_area_struct *area)
3144 {
3145 long size;
3146 unsigned long offset;
3147
3148 #ifdef pgprot_noncached
3149 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3150 #endif
3151 area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3152 area->vm_private_data = substream;
3153 area->vm_flags |= VM_IO;
3154 size = area->vm_end - area->vm_start;
3155 offset = area->vm_pgoff << PAGE_SHIFT;
3156 if (io_remap_pfn_range(area, area->vm_start,
3157 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3158 size, area->vm_page_prot))
3159 return -EAGAIN;
3160 atomic_inc(&substream->mmap_count);
3161 return 0;
3162 }
3163
3164 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3165 #endif /* SNDRV_PCM_INFO_MMAP */
3166
3167 /*
3168 * mmap DMA buffer
3169 */
3170 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3171 struct vm_area_struct *area)
3172 {
3173 struct snd_pcm_runtime *runtime;
3174 long size;
3175 unsigned long offset;
3176 size_t dma_bytes;
3177
3178 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3179 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3180 return -EINVAL;
3181 } else {
3182 if (!(area->vm_flags & VM_READ))
3183 return -EINVAL;
3184 }
3185 runtime = substream->runtime;
3186 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3187 return -EBADFD;
3188 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3189 return -ENXIO;
3190 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3191 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3192 return -EINVAL;
3193 size = area->vm_end - area->vm_start;
3194 offset = area->vm_pgoff << PAGE_SHIFT;
3195 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3196 if ((size_t)size > dma_bytes)
3197 return -EINVAL;
3198 if (offset > dma_bytes - size)
3199 return -EINVAL;
3200
3201 if (substream->ops->mmap)
3202 return substream->ops->mmap(substream, area);
3203 else
3204 return snd_pcm_default_mmap(substream, area);
3205 }
3206
3207 EXPORT_SYMBOL(snd_pcm_mmap_data);
3208
3209 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3210 {
3211 struct snd_pcm_file * pcm_file;
3212 struct snd_pcm_substream *substream;
3213 unsigned long offset;
3214
3215 pcm_file = file->private_data;
3216 substream = pcm_file->substream;
3217 if (PCM_RUNTIME_CHECK(substream))
3218 return -ENXIO;
3219
3220 offset = area->vm_pgoff << PAGE_SHIFT;
3221 switch (offset) {
3222 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3223 if (pcm_file->no_compat_mmap)
3224 return -ENXIO;
3225 return snd_pcm_mmap_status(substream, file, area);
3226 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3227 if (pcm_file->no_compat_mmap)
3228 return -ENXIO;
3229 return snd_pcm_mmap_control(substream, file, area);
3230 default:
3231 return snd_pcm_mmap_data(substream, file, area);
3232 }
3233 return 0;
3234 }
3235
3236 static int snd_pcm_fasync(int fd, struct file * file, int on)
3237 {
3238 struct snd_pcm_file * pcm_file;
3239 struct snd_pcm_substream *substream;
3240 struct snd_pcm_runtime *runtime;
3241 int err = -ENXIO;
3242
3243 lock_kernel();
3244 pcm_file = file->private_data;
3245 substream = pcm_file->substream;
3246 if (PCM_RUNTIME_CHECK(substream))
3247 goto out;
3248 runtime = substream->runtime;
3249 err = fasync_helper(fd, file, on, &runtime->fasync);
3250 out:
3251 unlock_kernel();
3252 return err;
3253 }
3254
3255 /*
3256 * ioctl32 compat
3257 */
3258 #ifdef CONFIG_COMPAT
3259 #include "pcm_compat.c"
3260 #else
3261 #define snd_pcm_ioctl_compat NULL
3262 #endif
3263
3264 /*
3265 * To be removed helpers to keep binary compatibility
3266 */
3267
3268 #ifdef CONFIG_SND_SUPPORT_OLD_API
3269 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3270 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3271
3272 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3273 struct snd_pcm_hw_params_old *oparams)
3274 {
3275 unsigned int i;
3276
3277 memset(params, 0, sizeof(*params));
3278 params->flags = oparams->flags;
3279 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3280 params->masks[i].bits[0] = oparams->masks[i];
3281 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3282 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3283 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3284 params->info = oparams->info;
3285 params->msbits = oparams->msbits;
3286 params->rate_num = oparams->rate_num;
3287 params->rate_den = oparams->rate_den;
3288 params->fifo_size = oparams->fifo_size;
3289 }
3290
3291 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3292 struct snd_pcm_hw_params *params)
3293 {
3294 unsigned int i;
3295
3296 memset(oparams, 0, sizeof(*oparams));
3297 oparams->flags = params->flags;
3298 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3299 oparams->masks[i] = params->masks[i].bits[0];
3300 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3301 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3302 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3303 oparams->info = params->info;
3304 oparams->msbits = params->msbits;
3305 oparams->rate_num = params->rate_num;
3306 oparams->rate_den = params->rate_den;
3307 oparams->fifo_size = params->fifo_size;
3308 }
3309
3310 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3311 struct snd_pcm_hw_params_old __user * _oparams)
3312 {
3313 struct snd_pcm_hw_params *params;
3314 struct snd_pcm_hw_params_old *oparams = NULL;
3315 int err;
3316
3317 params = kmalloc(sizeof(*params), GFP_KERNEL);
3318 if (!params)
3319 return -ENOMEM;
3320
3321 oparams = memdup_user(_oparams, sizeof(*oparams));
3322 if (IS_ERR(oparams)) {
3323 err = PTR_ERR(oparams);
3324 goto out;
3325 }
3326 snd_pcm_hw_convert_from_old_params(params, oparams);
3327 err = snd_pcm_hw_refine(substream, params);
3328 snd_pcm_hw_convert_to_old_params(oparams, params);
3329 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3330 if (!err)
3331 err = -EFAULT;
3332 }
3333
3334 kfree(oparams);
3335 out:
3336 kfree(params);
3337 return err;
3338 }
3339
3340 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3341 struct snd_pcm_hw_params_old __user * _oparams)
3342 {
3343 struct snd_pcm_hw_params *params;
3344 struct snd_pcm_hw_params_old *oparams = NULL;
3345 int err;
3346
3347 params = kmalloc(sizeof(*params), GFP_KERNEL);
3348 if (!params)
3349 return -ENOMEM;
3350
3351 oparams = memdup_user(_oparams, sizeof(*oparams));
3352 if (IS_ERR(oparams)) {
3353 err = PTR_ERR(oparams);
3354 goto out;
3355 }
3356 snd_pcm_hw_convert_from_old_params(params, oparams);
3357 err = snd_pcm_hw_params(substream, params);
3358 snd_pcm_hw_convert_to_old_params(oparams, params);
3359 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3360 if (!err)
3361 err = -EFAULT;
3362 }
3363
3364 kfree(oparams);
3365 out:
3366 kfree(params);
3367 return err;
3368 }
3369 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3370
3371 #ifndef CONFIG_MMU
3372 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
3373 unsigned long len, unsigned long pgoff,
3374 unsigned long flags)
3375 {
3376 return 0;
3377 }
3378 #else
3379 # define dummy_get_unmapped_area NULL
3380 #endif
3381
3382 /*
3383 * Register section
3384 */
3385
3386 const struct file_operations snd_pcm_f_ops[2] = {
3387 {
3388 .owner = THIS_MODULE,
3389 .write = snd_pcm_write,
3390 .aio_write = snd_pcm_aio_write,
3391 .open = snd_pcm_playback_open,
3392 .release = snd_pcm_release,
3393 .poll = snd_pcm_playback_poll,
3394 .unlocked_ioctl = snd_pcm_playback_ioctl,
3395 .compat_ioctl = snd_pcm_ioctl_compat,
3396 .mmap = snd_pcm_mmap,
3397 .fasync = snd_pcm_fasync,
3398 .get_unmapped_area = dummy_get_unmapped_area,
3399 },
3400 {
3401 .owner = THIS_MODULE,
3402 .read = snd_pcm_read,
3403 .aio_read = snd_pcm_aio_read,
3404 .open = snd_pcm_capture_open,
3405 .release = snd_pcm_release,
3406 .poll = snd_pcm_capture_poll,
3407 .unlocked_ioctl = snd_pcm_capture_ioctl,
3408 .compat_ioctl = snd_pcm_ioctl_compat,
3409 .mmap = snd_pcm_mmap,
3410 .fasync = snd_pcm_fasync,
3411 .get_unmapped_area = dummy_get_unmapped_area,
3412 }
3413 };
AMDTP streaming driver for the Linux FireWire stack (Juju)