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si4713-i2c: avoid potential buffer overflow on si4713
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / core / pcm_native.c
blob1a07750f3836ae93826fa20d5c5f7a56511bb3c3
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <linux/mm.h>
23 #include <linux/file.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/pm_qos_params.h>
27 #include <linux/uio.h>
28 #include <linux/dma-mapping.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 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
38 #include <dma-coherence.h>
39 #endif
40
41 /*
42 * Compatibility
43 */
44
45 struct snd_pcm_hw_params_old {
46 unsigned int flags;
47 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
48 SNDRV_PCM_HW_PARAM_ACCESS + 1];
49 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
50 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
51 unsigned int rmask;
52 unsigned int cmask;
53 unsigned int info;
54 unsigned int msbits;
55 unsigned int rate_num;
56 unsigned int rate_den;
57 snd_pcm_uframes_t fifo_size;
58 unsigned char reserved[64];
59 };
60
61 #ifdef CONFIG_SND_SUPPORT_OLD_API
62 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
63 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
64
65 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
66 struct snd_pcm_hw_params_old __user * _oparams);
67 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
68 struct snd_pcm_hw_params_old __user * _oparams);
69 #endif
70 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
71
72 /*
73 *
74 */
75
76 DEFINE_RWLOCK(snd_pcm_link_rwlock);
77 EXPORT_SYMBOL(snd_pcm_link_rwlock);
78
79 static DECLARE_RWSEM(snd_pcm_link_rwsem);
80
81 static inline mm_segment_t snd_enter_user(void)
82 {
83 mm_segment_t fs = get_fs();
84 set_fs(get_ds());
85 return fs;
86 }
87
88 static inline void snd_leave_user(mm_segment_t fs)
89 {
90 set_fs(fs);
91 }
92
93
94
95 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
96 {
97 struct snd_pcm_runtime *runtime;
98 struct snd_pcm *pcm = substream->pcm;
99 struct snd_pcm_str *pstr = substream->pstr;
100
101 memset(info, 0, sizeof(*info));
102 info->card = pcm->card->number;
103 info->device = pcm->device;
104 info->stream = substream->stream;
105 info->subdevice = substream->number;
106 strlcpy(info->id, pcm->id, sizeof(info->id));
107 strlcpy(info->name, pcm->name, sizeof(info->name));
108 info->dev_class = pcm->dev_class;
109 info->dev_subclass = pcm->dev_subclass;
110 info->subdevices_count = pstr->substream_count;
111 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
112 strlcpy(info->subname, substream->name, sizeof(info->subname));
113 runtime = substream->runtime;
114 /* AB: FIXME!!! This is definitely nonsense */
115 if (runtime) {
116 info->sync = runtime->sync;
117 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
118 }
119 return 0;
120 }
121
122 int snd_pcm_info_user(struct snd_pcm_substream *substream,
123 struct snd_pcm_info __user * _info)
124 {
125 struct snd_pcm_info *info;
126 int err;
127
128 info = kmalloc(sizeof(*info), GFP_KERNEL);
129 if (! info)
130 return -ENOMEM;
131 err = snd_pcm_info(substream, info);
132 if (err >= 0) {
133 if (copy_to_user(_info, info, sizeof(*info)))
134 err = -EFAULT;
135 }
136 kfree(info);
137 return err;
138 }
139
140 #undef RULES_DEBUG
141
142 #ifdef RULES_DEBUG
143 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
144 static const char * const snd_pcm_hw_param_names[] = {
145 HW_PARAM(ACCESS),
146 HW_PARAM(FORMAT),
147 HW_PARAM(SUBFORMAT),
148 HW_PARAM(SAMPLE_BITS),
149 HW_PARAM(FRAME_BITS),
150 HW_PARAM(CHANNELS),
151 HW_PARAM(RATE),
152 HW_PARAM(PERIOD_TIME),
153 HW_PARAM(PERIOD_SIZE),
154 HW_PARAM(PERIOD_BYTES),
155 HW_PARAM(PERIODS),
156 HW_PARAM(BUFFER_TIME),
157 HW_PARAM(BUFFER_SIZE),
158 HW_PARAM(BUFFER_BYTES),
159 HW_PARAM(TICK_TIME),
160 };
161 #endif
162
163 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
164 struct snd_pcm_hw_params *params)
165 {
166 unsigned int k;
167 struct snd_pcm_hardware *hw;
168 struct snd_interval *i = NULL;
169 struct snd_mask *m = NULL;
170 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
171 unsigned int rstamps[constrs->rules_num];
172 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
173 unsigned int stamp = 2;
174 int changed, again;
175
176 params->info = 0;
177 params->fifo_size = 0;
178 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
179 params->msbits = 0;
180 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
181 params->rate_num = 0;
182 params->rate_den = 0;
183 }
184
185 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
186 m = hw_param_mask(params, k);
187 if (snd_mask_empty(m))
188 return -EINVAL;
189 if (!(params->rmask & (1 << k)))
190 continue;
191 #ifdef RULES_DEBUG
192 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
193 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
194 #endif
195 changed = snd_mask_refine(m, constrs_mask(constrs, k));
196 #ifdef RULES_DEBUG
197 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
198 #endif
199 if (changed)
200 params->cmask |= 1 << k;
201 if (changed < 0)
202 return changed;
203 }
204
205 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
206 i = hw_param_interval(params, k);
207 if (snd_interval_empty(i))
208 return -EINVAL;
209 if (!(params->rmask & (1 << k)))
210 continue;
211 #ifdef RULES_DEBUG
212 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
213 if (i->empty)
214 printk("empty");
215 else
216 printk("%c%u %u%c",
217 i->openmin ? '(' : '[', i->min,
218 i->max, i->openmax ? ')' : ']');
219 printk(" -> ");
220 #endif
221 changed = snd_interval_refine(i, constrs_interval(constrs, k));
222 #ifdef RULES_DEBUG
223 if (i->empty)
224 printk("empty\n");
225 else
226 printk("%c%u %u%c\n",
227 i->openmin ? '(' : '[', i->min,
228 i->max, i->openmax ? ')' : ']');
229 #endif
230 if (changed)
231 params->cmask |= 1 << k;
232 if (changed < 0)
233 return changed;
234 }
235
236 for (k = 0; k < constrs->rules_num; k++)
237 rstamps[k] = 0;
238 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
239 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
240 do {
241 again = 0;
242 for (k = 0; k < constrs->rules_num; k++) {
243 struct snd_pcm_hw_rule *r = &constrs->rules[k];
244 unsigned int d;
245 int doit = 0;
246 if (r->cond && !(r->cond & params->flags))
247 continue;
248 for (d = 0; r->deps[d] >= 0; d++) {
249 if (vstamps[r->deps[d]] > rstamps[k]) {
250 doit = 1;
251 break;
252 }
253 }
254 if (!doit)
255 continue;
256 #ifdef RULES_DEBUG
257 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
258 if (r->var >= 0) {
259 printk("%s = ", snd_pcm_hw_param_names[r->var]);
260 if (hw_is_mask(r->var)) {
261 m = hw_param_mask(params, r->var);
262 printk("%x", *m->bits);
263 } else {
264 i = hw_param_interval(params, r->var);
265 if (i->empty)
266 printk("empty");
267 else
268 printk("%c%u %u%c",
269 i->openmin ? '(' : '[', i->min,
270 i->max, i->openmax ? ')' : ']');
271 }
272 }
273 #endif
274 changed = r->func(params, r);
275 #ifdef RULES_DEBUG
276 if (r->var >= 0) {
277 printk(" -> ");
278 if (hw_is_mask(r->var))
279 printk("%x", *m->bits);
280 else {
281 if (i->empty)
282 printk("empty");
283 else
284 printk("%c%u %u%c",
285 i->openmin ? '(' : '[', i->min,
286 i->max, i->openmax ? ')' : ']');
287 }
288 }
289 printk("\n");
290 #endif
291 rstamps[k] = stamp;
292 if (changed && r->var >= 0) {
293 params->cmask |= (1 << r->var);
294 vstamps[r->var] = stamp;
295 again = 1;
296 }
297 if (changed < 0)
298 return changed;
299 stamp++;
300 }
301 } while (again);
302 if (!params->msbits) {
303 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
304 if (snd_interval_single(i))
305 params->msbits = snd_interval_value(i);
306 }
307
308 if (!params->rate_den) {
309 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
310 if (snd_interval_single(i)) {
311 params->rate_num = snd_interval_value(i);
312 params->rate_den = 1;
313 }
314 }
315
316 hw = &substream->runtime->hw;
317 if (!params->info)
318 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
319 if (!params->fifo_size) {
320 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
321 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
322 if (snd_mask_min(m) == snd_mask_max(m) &&
323 snd_interval_min(i) == snd_interval_max(i)) {
324 changed = substream->ops->ioctl(substream,
325 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
326 if (changed < 0)
327 return changed;
328 }
329 }
330 params->rmask = 0;
331 return 0;
332 }
333
334 EXPORT_SYMBOL(snd_pcm_hw_refine);
335
336 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
337 struct snd_pcm_hw_params __user * _params)
338 {
339 struct snd_pcm_hw_params *params;
340 int err;
341
342 params = memdup_user(_params, sizeof(*params));
343 if (IS_ERR(params))
344 return PTR_ERR(params);
345
346 err = snd_pcm_hw_refine(substream, params);
347 if (copy_to_user(_params, params, sizeof(*params))) {
348 if (!err)
349 err = -EFAULT;
350 }
351
352 kfree(params);
353 return err;
354 }
355
356 static int period_to_usecs(struct snd_pcm_runtime *runtime)
357 {
358 int usecs;
359
360 if (! runtime->rate)
361 return -1; /* invalid */
362
363 /* take 75% of period time as the deadline */
364 usecs = (750000 / runtime->rate) * runtime->period_size;
365 usecs += ((750000 % runtime->rate) * runtime->period_size) /
366 runtime->rate;
367
368 return usecs;
369 }
370
371 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
372 struct snd_pcm_hw_params *params)
373 {
374 struct snd_pcm_runtime *runtime;
375 int err, usecs;
376 unsigned int bits;
377 snd_pcm_uframes_t frames;
378
379 if (PCM_RUNTIME_CHECK(substream))
380 return -ENXIO;
381 runtime = substream->runtime;
382 snd_pcm_stream_lock_irq(substream);
383 switch (runtime->status->state) {
384 case SNDRV_PCM_STATE_OPEN:
385 case SNDRV_PCM_STATE_SETUP:
386 case SNDRV_PCM_STATE_PREPARED:
387 break;
388 default:
389 snd_pcm_stream_unlock_irq(substream);
390 return -EBADFD;
391 }
392 snd_pcm_stream_unlock_irq(substream);
393 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
394 if (!substream->oss.oss)
395 #endif
396 if (atomic_read(&substream->mmap_count))
397 return -EBADFD;
398
399 params->rmask = ~0U;
400 err = snd_pcm_hw_refine(substream, params);
401 if (err < 0)
402 goto _error;
403
404 err = snd_pcm_hw_params_choose(substream, params);
405 if (err < 0)
406 goto _error;
407
408 if (substream->ops->hw_params != NULL) {
409 err = substream->ops->hw_params(substream, params);
410 if (err < 0)
411 goto _error;
412 }
413
414 runtime->access = params_access(params);
415 runtime->format = params_format(params);
416 runtime->subformat = params_subformat(params);
417 runtime->channels = params_channels(params);
418 runtime->rate = params_rate(params);
419 runtime->period_size = params_period_size(params);
420 runtime->periods = params_periods(params);
421 runtime->buffer_size = params_buffer_size(params);
422 runtime->info = params->info;
423 runtime->rate_num = params->rate_num;
424 runtime->rate_den = params->rate_den;
425 runtime->no_period_wakeup =
426 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
427 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
428
429 bits = snd_pcm_format_physical_width(runtime->format);
430 runtime->sample_bits = bits;
431 bits *= runtime->channels;
432 runtime->frame_bits = bits;
433 frames = 1;
434 while (bits % 8 != 0) {
435 bits *= 2;
436 frames *= 2;
437 }
438 runtime->byte_align = bits / 8;
439 runtime->min_align = frames;
440
441 /* Default sw params */
442 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
443 runtime->period_step = 1;
444 runtime->control->avail_min = runtime->period_size;
445 runtime->start_threshold = 1;
446 runtime->stop_threshold = runtime->buffer_size;
447 runtime->silence_threshold = 0;
448 runtime->silence_size = 0;
449 runtime->boundary = runtime->buffer_size;
450 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
451 runtime->boundary *= 2;
452
453 snd_pcm_timer_resolution_change(substream);
454 runtime->status->state = SNDRV_PCM_STATE_SETUP;
455
456 if (pm_qos_request_active(&substream->latency_pm_qos_req))
457 pm_qos_remove_request(&substream->latency_pm_qos_req);
458 if ((usecs = period_to_usecs(runtime)) >= 0)
459 pm_qos_add_request(&substream->latency_pm_qos_req,
460 PM_QOS_CPU_DMA_LATENCY, usecs);
461 return 0;
462 _error:
463 /* hardware might be unusable from this time,
464 so we force application to retry to set
465 the correct hardware parameter settings */
466 runtime->status->state = SNDRV_PCM_STATE_OPEN;
467 if (substream->ops->hw_free != NULL)
468 substream->ops->hw_free(substream);
469 return err;
470 }
471
472 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
473 struct snd_pcm_hw_params __user * _params)
474 {
475 struct snd_pcm_hw_params *params;
476 int err;
477
478 params = memdup_user(_params, sizeof(*params));
479 if (IS_ERR(params))
480 return PTR_ERR(params);
481
482 err = snd_pcm_hw_params(substream, params);
483 if (copy_to_user(_params, params, sizeof(*params))) {
484 if (!err)
485 err = -EFAULT;
486 }
487
488 kfree(params);
489 return err;
490 }
491
492 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
493 {
494 struct snd_pcm_runtime *runtime;
495 int result = 0;
496
497 if (PCM_RUNTIME_CHECK(substream))
498 return -ENXIO;
499 runtime = substream->runtime;
500 snd_pcm_stream_lock_irq(substream);
501 switch (runtime->status->state) {
502 case SNDRV_PCM_STATE_SETUP:
503 case SNDRV_PCM_STATE_PREPARED:
504 break;
505 default:
506 snd_pcm_stream_unlock_irq(substream);
507 return -EBADFD;
508 }
509 snd_pcm_stream_unlock_irq(substream);
510 if (atomic_read(&substream->mmap_count))
511 return -EBADFD;
512 if (substream->ops->hw_free)
513 result = substream->ops->hw_free(substream);
514 runtime->status->state = SNDRV_PCM_STATE_OPEN;
515 pm_qos_remove_request(&substream->latency_pm_qos_req);
516 return result;
517 }
518
519 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
520 struct snd_pcm_sw_params *params)
521 {
522 struct snd_pcm_runtime *runtime;
523 int err;
524
525 if (PCM_RUNTIME_CHECK(substream))
526 return -ENXIO;
527 runtime = substream->runtime;
528 snd_pcm_stream_lock_irq(substream);
529 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
530 snd_pcm_stream_unlock_irq(substream);
531 return -EBADFD;
532 }
533 snd_pcm_stream_unlock_irq(substream);
534
535 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
536 return -EINVAL;
537 if (params->avail_min == 0)
538 return -EINVAL;
539 if (params->silence_size >= runtime->boundary) {
540 if (params->silence_threshold != 0)
541 return -EINVAL;
542 } else {
543 if (params->silence_size > params->silence_threshold)
544 return -EINVAL;
545 if (params->silence_threshold > runtime->buffer_size)
546 return -EINVAL;
547 }
548 err = 0;
549 snd_pcm_stream_lock_irq(substream);
550 runtime->tstamp_mode = params->tstamp_mode;
551 runtime->period_step = params->period_step;
552 runtime->control->avail_min = params->avail_min;
553 runtime->start_threshold = params->start_threshold;
554 runtime->stop_threshold = params->stop_threshold;
555 runtime->silence_threshold = params->silence_threshold;
556 runtime->silence_size = params->silence_size;
557 params->boundary = runtime->boundary;
558 if (snd_pcm_running(substream)) {
559 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
560 runtime->silence_size > 0)
561 snd_pcm_playback_silence(substream, ULONG_MAX);
562 err = snd_pcm_update_state(substream, runtime);
563 }
564 snd_pcm_stream_unlock_irq(substream);
565 return err;
566 }
567
568 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
569 struct snd_pcm_sw_params __user * _params)
570 {
571 struct snd_pcm_sw_params params;
572 int err;
573 if (copy_from_user(&params, _params, sizeof(params)))
574 return -EFAULT;
575 err = snd_pcm_sw_params(substream, &params);
576 if (copy_to_user(_params, &params, sizeof(params)))
577 return -EFAULT;
578 return err;
579 }
580
581 int snd_pcm_status(struct snd_pcm_substream *substream,
582 struct snd_pcm_status *status)
583 {
584 struct snd_pcm_runtime *runtime = substream->runtime;
585
586 snd_pcm_stream_lock_irq(substream);
587 status->state = runtime->status->state;
588 status->suspended_state = runtime->status->suspended_state;
589 if (status->state == SNDRV_PCM_STATE_OPEN)
590 goto _end;
591 status->trigger_tstamp = runtime->trigger_tstamp;
592 if (snd_pcm_running(substream)) {
593 snd_pcm_update_hw_ptr(substream);
594 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
595 status->tstamp = runtime->status->tstamp;
596 goto _tstamp_end;
597 }
598 }
599 snd_pcm_gettime(runtime, &status->tstamp);
600 _tstamp_end:
601 status->appl_ptr = runtime->control->appl_ptr;
602 status->hw_ptr = runtime->status->hw_ptr;
603 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
604 status->avail = snd_pcm_playback_avail(runtime);
605 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
606 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
607 status->delay = runtime->buffer_size - status->avail;
608 status->delay += runtime->delay;
609 } else
610 status->delay = 0;
611 } else {
612 status->avail = snd_pcm_capture_avail(runtime);
613 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
614 status->delay = status->avail + runtime->delay;
615 else
616 status->delay = 0;
617 }
618 status->avail_max = runtime->avail_max;
619 status->overrange = runtime->overrange;
620 runtime->avail_max = 0;
621 runtime->overrange = 0;
622 _end:
623 snd_pcm_stream_unlock_irq(substream);
624 return 0;
625 }
626
627 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
628 struct snd_pcm_status __user * _status)
629 {
630 struct snd_pcm_status status;
631 int res;
632
633 memset(&status, 0, sizeof(status));
634 res = snd_pcm_status(substream, &status);
635 if (res < 0)
636 return res;
637 if (copy_to_user(_status, &status, sizeof(status)))
638 return -EFAULT;
639 return 0;
640 }
641
642 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
643 struct snd_pcm_channel_info * info)
644 {
645 struct snd_pcm_runtime *runtime;
646 unsigned int channel;
647
648 channel = info->channel;
649 runtime = substream->runtime;
650 snd_pcm_stream_lock_irq(substream);
651 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
652 snd_pcm_stream_unlock_irq(substream);
653 return -EBADFD;
654 }
655 snd_pcm_stream_unlock_irq(substream);
656 if (channel >= runtime->channels)
657 return -EINVAL;
658 memset(info, 0, sizeof(*info));
659 info->channel = channel;
660 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
661 }
662
663 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
664 struct snd_pcm_channel_info __user * _info)
665 {
666 struct snd_pcm_channel_info info;
667 int res;
668
669 if (copy_from_user(&info, _info, sizeof(info)))
670 return -EFAULT;
671 res = snd_pcm_channel_info(substream, &info);
672 if (res < 0)
673 return res;
674 if (copy_to_user(_info, &info, sizeof(info)))
675 return -EFAULT;
676 return 0;
677 }
678
679 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
680 {
681 struct snd_pcm_runtime *runtime = substream->runtime;
682 if (runtime->trigger_master == NULL)
683 return;
684 if (runtime->trigger_master == substream) {
685 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
686 } else {
687 snd_pcm_trigger_tstamp(runtime->trigger_master);
688 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
689 }
690 runtime->trigger_master = NULL;
691 }
692
693 struct action_ops {
694 int (*pre_action)(struct snd_pcm_substream *substream, int state);
695 int (*do_action)(struct snd_pcm_substream *substream, int state);
696 void (*undo_action)(struct snd_pcm_substream *substream, int state);
697 void (*post_action)(struct snd_pcm_substream *substream, int state);
698 };
699
700 /*
701 * this functions is core for handling of linked stream
702 * Note: the stream state might be changed also on failure
703 * Note2: call with calling stream lock + link lock
704 */
705 static int snd_pcm_action_group(struct action_ops *ops,
706 struct snd_pcm_substream *substream,
707 int state, int do_lock)
708 {
709 struct snd_pcm_substream *s = NULL;
710 struct snd_pcm_substream *s1;
711 int res = 0;
712
713 snd_pcm_group_for_each_entry(s, substream) {
714 if (do_lock && s != substream)
715 spin_lock_nested(&s->self_group.lock,
716 SINGLE_DEPTH_NESTING);
717 res = ops->pre_action(s, state);
718 if (res < 0)
719 goto _unlock;
720 }
721 snd_pcm_group_for_each_entry(s, substream) {
722 res = ops->do_action(s, state);
723 if (res < 0) {
724 if (ops->undo_action) {
725 snd_pcm_group_for_each_entry(s1, substream) {
726 if (s1 == s) /* failed stream */
727 break;
728 ops->undo_action(s1, state);
729 }
730 }
731 s = NULL; /* unlock all */
732 goto _unlock;
733 }
734 }
735 snd_pcm_group_for_each_entry(s, substream) {
736 ops->post_action(s, state);
737 }
738 _unlock:
739 if (do_lock) {
740 /* unlock streams */
741 snd_pcm_group_for_each_entry(s1, substream) {
742 if (s1 != substream)
743 spin_unlock(&s1->self_group.lock);
744 if (s1 == s) /* end */
745 break;
746 }
747 }
748 return res;
749 }
750
751 /*
752 * Note: call with stream lock
753 */
754 static int snd_pcm_action_single(struct action_ops *ops,
755 struct snd_pcm_substream *substream,
756 int state)
757 {
758 int res;
759
760 res = ops->pre_action(substream, state);
761 if (res < 0)
762 return res;
763 res = ops->do_action(substream, state);
764 if (res == 0)
765 ops->post_action(substream, state);
766 else if (ops->undo_action)
767 ops->undo_action(substream, state);
768 return res;
769 }
770
771 /*
772 * Note: call with stream lock
773 */
774 static int snd_pcm_action(struct action_ops *ops,
775 struct snd_pcm_substream *substream,
776 int state)
777 {
778 int res;
779
780 if (snd_pcm_stream_linked(substream)) {
781 if (!spin_trylock(&substream->group->lock)) {
782 spin_unlock(&substream->self_group.lock);
783 spin_lock(&substream->group->lock);
784 spin_lock(&substream->self_group.lock);
785 }
786 res = snd_pcm_action_group(ops, substream, state, 1);
787 spin_unlock(&substream->group->lock);
788 } else {
789 res = snd_pcm_action_single(ops, substream, state);
790 }
791 return res;
792 }
793
794 /*
795 * Note: don't use any locks before
796 */
797 static int snd_pcm_action_lock_irq(struct action_ops *ops,
798 struct snd_pcm_substream *substream,
799 int state)
800 {
801 int res;
802
803 read_lock_irq(&snd_pcm_link_rwlock);
804 if (snd_pcm_stream_linked(substream)) {
805 spin_lock(&substream->group->lock);
806 spin_lock(&substream->self_group.lock);
807 res = snd_pcm_action_group(ops, substream, state, 1);
808 spin_unlock(&substream->self_group.lock);
809 spin_unlock(&substream->group->lock);
810 } else {
811 spin_lock(&substream->self_group.lock);
812 res = snd_pcm_action_single(ops, substream, state);
813 spin_unlock(&substream->self_group.lock);
814 }
815 read_unlock_irq(&snd_pcm_link_rwlock);
816 return res;
817 }
818
819 /*
820 */
821 static int snd_pcm_action_nonatomic(struct action_ops *ops,
822 struct snd_pcm_substream *substream,
823 int state)
824 {
825 int res;
826
827 down_read(&snd_pcm_link_rwsem);
828 if (snd_pcm_stream_linked(substream))
829 res = snd_pcm_action_group(ops, substream, state, 0);
830 else
831 res = snd_pcm_action_single(ops, substream, state);
832 up_read(&snd_pcm_link_rwsem);
833 return res;
834 }
835
836 /*
837 * start callbacks
838 */
839 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
840 {
841 struct snd_pcm_runtime *runtime = substream->runtime;
842 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
843 return -EBADFD;
844 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
845 !snd_pcm_playback_data(substream))
846 return -EPIPE;
847 runtime->trigger_master = substream;
848 return 0;
849 }
850
851 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
852 {
853 if (substream->runtime->trigger_master != substream)
854 return 0;
855 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
856 }
857
858 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
859 {
860 if (substream->runtime->trigger_master == substream)
861 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
862 }
863
864 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
865 {
866 struct snd_pcm_runtime *runtime = substream->runtime;
867 snd_pcm_trigger_tstamp(substream);
868 runtime->hw_ptr_jiffies = jiffies;
869 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
870 runtime->rate;
871 runtime->status->state = state;
872 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
873 runtime->silence_size > 0)
874 snd_pcm_playback_silence(substream, ULONG_MAX);
875 if (substream->timer)
876 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
877 &runtime->trigger_tstamp);
878 }
879
880 static struct action_ops snd_pcm_action_start = {
881 .pre_action = snd_pcm_pre_start,
882 .do_action = snd_pcm_do_start,
883 .undo_action = snd_pcm_undo_start,
884 .post_action = snd_pcm_post_start
885 };
886
887 /**
888 * snd_pcm_start - start all linked streams
889 * @substream: the PCM substream instance
890 */
891 int snd_pcm_start(struct snd_pcm_substream *substream)
892 {
893 return snd_pcm_action(&snd_pcm_action_start, substream,
894 SNDRV_PCM_STATE_RUNNING);
895 }
896
897 /*
898 * stop callbacks
899 */
900 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
901 {
902 struct snd_pcm_runtime *runtime = substream->runtime;
903 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
904 return -EBADFD;
905 runtime->trigger_master = substream;
906 return 0;
907 }
908
909 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
910 {
911 if (substream->runtime->trigger_master == substream &&
912 snd_pcm_running(substream))
913 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
914 return 0; /* unconditonally stop all substreams */
915 }
916
917 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
918 {
919 struct snd_pcm_runtime *runtime = substream->runtime;
920 if (runtime->status->state != state) {
921 snd_pcm_trigger_tstamp(substream);
922 if (substream->timer)
923 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
924 &runtime->trigger_tstamp);
925 runtime->status->state = state;
926 }
927 wake_up(&runtime->sleep);
928 wake_up(&runtime->tsleep);
929 }
930
931 static struct action_ops snd_pcm_action_stop = {
932 .pre_action = snd_pcm_pre_stop,
933 .do_action = snd_pcm_do_stop,
934 .post_action = snd_pcm_post_stop
935 };
936
937 /**
938 * snd_pcm_stop - try to stop all running streams in the substream group
939 * @substream: the PCM substream instance
940 * @state: PCM state after stopping the stream
941 *
942 * The state of each stream is then changed to the given state unconditionally.
943 */
944 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
945 {
946 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
947 }
948
949 EXPORT_SYMBOL(snd_pcm_stop);
950
951 /**
952 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
953 * @substream: the PCM substream
954 *
955 * After stopping, the state is changed to SETUP.
956 * Unlike snd_pcm_stop(), this affects only the given stream.
957 */
958 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
959 {
960 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
961 SNDRV_PCM_STATE_SETUP);
962 }
963
964 /*
965 * pause callbacks
966 */
967 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
968 {
969 struct snd_pcm_runtime *runtime = substream->runtime;
970 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
971 return -ENOSYS;
972 if (push) {
973 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
974 return -EBADFD;
975 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
976 return -EBADFD;
977 runtime->trigger_master = substream;
978 return 0;
979 }
980
981 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
982 {
983 if (substream->runtime->trigger_master != substream)
984 return 0;
985 /* some drivers might use hw_ptr to recover from the pause -
986 update the hw_ptr now */
987 if (push)
988 snd_pcm_update_hw_ptr(substream);
989 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
990 * a delta between the current jiffies, this gives a large enough
991 * delta, effectively to skip the check once.
992 */
993 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
994 return substream->ops->trigger(substream,
995 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
996 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
997 }
998
999 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1000 {
1001 if (substream->runtime->trigger_master == substream)
1002 substream->ops->trigger(substream,
1003 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1004 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1005 }
1006
1007 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1008 {
1009 struct snd_pcm_runtime *runtime = substream->runtime;
1010 snd_pcm_trigger_tstamp(substream);
1011 if (push) {
1012 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1013 if (substream->timer)
1014 snd_timer_notify(substream->timer,
1015 SNDRV_TIMER_EVENT_MPAUSE,
1016 &runtime->trigger_tstamp);
1017 wake_up(&runtime->sleep);
1018 wake_up(&runtime->tsleep);
1019 } else {
1020 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1021 if (substream->timer)
1022 snd_timer_notify(substream->timer,
1023 SNDRV_TIMER_EVENT_MCONTINUE,
1024 &runtime->trigger_tstamp);
1025 }
1026 }
1027
1028 static struct action_ops snd_pcm_action_pause = {
1029 .pre_action = snd_pcm_pre_pause,
1030 .do_action = snd_pcm_do_pause,
1031 .undo_action = snd_pcm_undo_pause,
1032 .post_action = snd_pcm_post_pause
1033 };
1034
1035 /*
1036 * Push/release the pause for all linked streams.
1037 */
1038 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1039 {
1040 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1041 }
1042
1043 #ifdef CONFIG_PM
1044 /* suspend */
1045
1046 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1047 {
1048 struct snd_pcm_runtime *runtime = substream->runtime;
1049 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1050 return -EBUSY;
1051 runtime->trigger_master = substream;
1052 return 0;
1053 }
1054
1055 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1056 {
1057 struct snd_pcm_runtime *runtime = substream->runtime;
1058 if (runtime->trigger_master != substream)
1059 return 0;
1060 if (! snd_pcm_running(substream))
1061 return 0;
1062 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1063 return 0; /* suspend unconditionally */
1064 }
1065
1066 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1067 {
1068 struct snd_pcm_runtime *runtime = substream->runtime;
1069 snd_pcm_trigger_tstamp(substream);
1070 if (substream->timer)
1071 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1072 &runtime->trigger_tstamp);
1073 runtime->status->suspended_state = runtime->status->state;
1074 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1075 wake_up(&runtime->sleep);
1076 wake_up(&runtime->tsleep);
1077 }
1078
1079 static struct action_ops snd_pcm_action_suspend = {
1080 .pre_action = snd_pcm_pre_suspend,
1081 .do_action = snd_pcm_do_suspend,
1082 .post_action = snd_pcm_post_suspend
1083 };
1084
1085 /**
1086 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1087 * @substream: the PCM substream
1088 *
1089 * After this call, all streams are changed to SUSPENDED state.
1090 */
1091 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1092 {
1093 int err;
1094 unsigned long flags;
1095
1096 if (! substream)
1097 return 0;
1098
1099 snd_pcm_stream_lock_irqsave(substream, flags);
1100 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1101 snd_pcm_stream_unlock_irqrestore(substream, flags);
1102 return err;
1103 }
1104
1105 EXPORT_SYMBOL(snd_pcm_suspend);
1106
1107 /**
1108 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1109 * @pcm: the PCM instance
1110 *
1111 * After this call, all streams are changed to SUSPENDED state.
1112 */
1113 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1114 {
1115 struct snd_pcm_substream *substream;
1116 int stream, err = 0;
1117
1118 if (! pcm)
1119 return 0;
1120
1121 for (stream = 0; stream < 2; stream++) {
1122 for (substream = pcm->streams[stream].substream;
1123 substream; substream = substream->next) {
1124 /* FIXME: the open/close code should lock this as well */
1125 if (substream->runtime == NULL)
1126 continue;
1127 err = snd_pcm_suspend(substream);
1128 if (err < 0 && err != -EBUSY)
1129 return err;
1130 }
1131 }
1132 return 0;
1133 }
1134
1135 EXPORT_SYMBOL(snd_pcm_suspend_all);
1136
1137 /* resume */
1138
1139 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1140 {
1141 struct snd_pcm_runtime *runtime = substream->runtime;
1142 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1143 return -ENOSYS;
1144 runtime->trigger_master = substream;
1145 return 0;
1146 }
1147
1148 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1149 {
1150 struct snd_pcm_runtime *runtime = substream->runtime;
1151 if (runtime->trigger_master != substream)
1152 return 0;
1153 /* DMA not running previously? */
1154 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1155 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1156 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1157 return 0;
1158 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1159 }
1160
1161 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1162 {
1163 if (substream->runtime->trigger_master == substream &&
1164 snd_pcm_running(substream))
1165 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1166 }
1167
1168 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1169 {
1170 struct snd_pcm_runtime *runtime = substream->runtime;
1171 snd_pcm_trigger_tstamp(substream);
1172 if (substream->timer)
1173 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1174 &runtime->trigger_tstamp);
1175 runtime->status->state = runtime->status->suspended_state;
1176 }
1177
1178 static struct action_ops snd_pcm_action_resume = {
1179 .pre_action = snd_pcm_pre_resume,
1180 .do_action = snd_pcm_do_resume,
1181 .undo_action = snd_pcm_undo_resume,
1182 .post_action = snd_pcm_post_resume
1183 };
1184
1185 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1186 {
1187 struct snd_card *card = substream->pcm->card;
1188 int res;
1189
1190 snd_power_lock(card);
1191 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1192 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1193 snd_power_unlock(card);
1194 return res;
1195 }
1196
1197 #else
1198
1199 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1200 {
1201 return -ENOSYS;
1202 }
1203
1204 #endif /* CONFIG_PM */
1205
1206 /*
1207 * xrun ioctl
1208 *
1209 * Change the RUNNING stream(s) to XRUN state.
1210 */
1211 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1212 {
1213 struct snd_card *card = substream->pcm->card;
1214 struct snd_pcm_runtime *runtime = substream->runtime;
1215 int result;
1216
1217 snd_power_lock(card);
1218 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1219 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1220 if (result < 0)
1221 goto _unlock;
1222 }
1223
1224 snd_pcm_stream_lock_irq(substream);
1225 switch (runtime->status->state) {
1226 case SNDRV_PCM_STATE_XRUN:
1227 result = 0; /* already there */
1228 break;
1229 case SNDRV_PCM_STATE_RUNNING:
1230 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1231 break;
1232 default:
1233 result = -EBADFD;
1234 }
1235 snd_pcm_stream_unlock_irq(substream);
1236 _unlock:
1237 snd_power_unlock(card);
1238 return result;
1239 }
1240
1241 /*
1242 * reset ioctl
1243 */
1244 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1245 {
1246 struct snd_pcm_runtime *runtime = substream->runtime;
1247 switch (runtime->status->state) {
1248 case SNDRV_PCM_STATE_RUNNING:
1249 case SNDRV_PCM_STATE_PREPARED:
1250 case SNDRV_PCM_STATE_PAUSED:
1251 case SNDRV_PCM_STATE_SUSPENDED:
1252 return 0;
1253 default:
1254 return -EBADFD;
1255 }
1256 }
1257
1258 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1259 {
1260 struct snd_pcm_runtime *runtime = substream->runtime;
1261 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1262 if (err < 0)
1263 return err;
1264 runtime->hw_ptr_base = 0;
1265 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1266 runtime->status->hw_ptr % runtime->period_size;
1267 runtime->silence_start = runtime->status->hw_ptr;
1268 runtime->silence_filled = 0;
1269 return 0;
1270 }
1271
1272 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1273 {
1274 struct snd_pcm_runtime *runtime = substream->runtime;
1275 runtime->control->appl_ptr = runtime->status->hw_ptr;
1276 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1277 runtime->silence_size > 0)
1278 snd_pcm_playback_silence(substream, ULONG_MAX);
1279 }
1280
1281 static struct action_ops snd_pcm_action_reset = {
1282 .pre_action = snd_pcm_pre_reset,
1283 .do_action = snd_pcm_do_reset,
1284 .post_action = snd_pcm_post_reset
1285 };
1286
1287 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1288 {
1289 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1290 }
1291
1292 /*
1293 * prepare ioctl
1294 */
1295 /* we use the second argument for updating f_flags */
1296 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1297 int f_flags)
1298 {
1299 struct snd_pcm_runtime *runtime = substream->runtime;
1300 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1301 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1302 return -EBADFD;
1303 if (snd_pcm_running(substream))
1304 return -EBUSY;
1305 substream->f_flags = f_flags;
1306 return 0;
1307 }
1308
1309 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1310 {
1311 int err;
1312 err = substream->ops->prepare(substream);
1313 if (err < 0)
1314 return err;
1315 return snd_pcm_do_reset(substream, 0);
1316 }
1317
1318 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1319 {
1320 struct snd_pcm_runtime *runtime = substream->runtime;
1321 runtime->control->appl_ptr = runtime->status->hw_ptr;
1322 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1323 }
1324
1325 static struct action_ops snd_pcm_action_prepare = {
1326 .pre_action = snd_pcm_pre_prepare,
1327 .do_action = snd_pcm_do_prepare,
1328 .post_action = snd_pcm_post_prepare
1329 };
1330
1331 /**
1332 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1333 * @substream: the PCM substream instance
1334 * @file: file to refer f_flags
1335 */
1336 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1337 struct file *file)
1338 {
1339 int res;
1340 struct snd_card *card = substream->pcm->card;
1341 int f_flags;
1342
1343 if (file)
1344 f_flags = file->f_flags;
1345 else
1346 f_flags = substream->f_flags;
1347
1348 snd_power_lock(card);
1349 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1350 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1351 substream, f_flags);
1352 snd_power_unlock(card);
1353 return res;
1354 }
1355
1356 /*
1357 * drain ioctl
1358 */
1359
1360 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1361 {
1362 substream->runtime->trigger_master = substream;
1363 return 0;
1364 }
1365
1366 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1367 {
1368 struct snd_pcm_runtime *runtime = substream->runtime;
1369 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1370 switch (runtime->status->state) {
1371 case SNDRV_PCM_STATE_PREPARED:
1372 /* start playback stream if possible */
1373 if (! snd_pcm_playback_empty(substream)) {
1374 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1375 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1376 }
1377 break;
1378 case SNDRV_PCM_STATE_RUNNING:
1379 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1380 break;
1381 default:
1382 break;
1383 }
1384 } else {
1385 /* stop running stream */
1386 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1387 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1388 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1389 snd_pcm_do_stop(substream, new_state);
1390 snd_pcm_post_stop(substream, new_state);
1391 }
1392 }
1393 return 0;
1394 }
1395
1396 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1397 {
1398 }
1399
1400 static struct action_ops snd_pcm_action_drain_init = {
1401 .pre_action = snd_pcm_pre_drain_init,
1402 .do_action = snd_pcm_do_drain_init,
1403 .post_action = snd_pcm_post_drain_init
1404 };
1405
1406 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1407
1408 /*
1409 * Drain the stream(s).
1410 * When the substream is linked, sync until the draining of all playback streams
1411 * is finished.
1412 * After this call, all streams are supposed to be either SETUP or DRAINING
1413 * (capture only) state.
1414 */
1415 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1416 struct file *file)
1417 {
1418 struct snd_card *card;
1419 struct snd_pcm_runtime *runtime;
1420 struct snd_pcm_substream *s;
1421 wait_queue_t wait;
1422 int result = 0;
1423 int nonblock = 0;
1424
1425 card = substream->pcm->card;
1426 runtime = substream->runtime;
1427
1428 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1429 return -EBADFD;
1430
1431 snd_power_lock(card);
1432 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1433 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1434 if (result < 0) {
1435 snd_power_unlock(card);
1436 return result;
1437 }
1438 }
1439
1440 if (file) {
1441 if (file->f_flags & O_NONBLOCK)
1442 nonblock = 1;
1443 } else if (substream->f_flags & O_NONBLOCK)
1444 nonblock = 1;
1445
1446 down_read(&snd_pcm_link_rwsem);
1447 snd_pcm_stream_lock_irq(substream);
1448 /* resume pause */
1449 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1450 snd_pcm_pause(substream, 0);
1451
1452 /* pre-start/stop - all running streams are changed to DRAINING state */
1453 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1454 if (result < 0)
1455 goto unlock;
1456 /* in non-blocking, we don't wait in ioctl but let caller poll */
1457 if (nonblock) {
1458 result = -EAGAIN;
1459 goto unlock;
1460 }
1461
1462 for (;;) {
1463 long tout;
1464 struct snd_pcm_runtime *to_check;
1465 if (signal_pending(current)) {
1466 result = -ERESTARTSYS;
1467 break;
1468 }
1469 /* find a substream to drain */
1470 to_check = NULL;
1471 snd_pcm_group_for_each_entry(s, substream) {
1472 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1473 continue;
1474 runtime = s->runtime;
1475 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1476 to_check = runtime;
1477 break;
1478 }
1479 }
1480 if (!to_check)
1481 break; /* all drained */
1482 init_waitqueue_entry(&wait, current);
1483 add_wait_queue(&to_check->sleep, &wait);
1484 set_current_state(TASK_INTERRUPTIBLE);
1485 snd_pcm_stream_unlock_irq(substream);
1486 up_read(&snd_pcm_link_rwsem);
1487 snd_power_unlock(card);
1488 tout = schedule_timeout(10 * HZ);
1489 snd_power_lock(card);
1490 down_read(&snd_pcm_link_rwsem);
1491 snd_pcm_stream_lock_irq(substream);
1492 remove_wait_queue(&to_check->sleep, &wait);
1493 if (tout == 0) {
1494 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1495 result = -ESTRPIPE;
1496 else {
1497 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1498 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1499 result = -EIO;
1500 }
1501 break;
1502 }
1503 }
1504
1505 unlock:
1506 snd_pcm_stream_unlock_irq(substream);
1507 up_read(&snd_pcm_link_rwsem);
1508 snd_power_unlock(card);
1509
1510 return result;
1511 }
1512
1513 /*
1514 * drop ioctl
1515 *
1516 * Immediately put all linked substreams into SETUP state.
1517 */
1518 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1519 {
1520 struct snd_pcm_runtime *runtime;
1521 struct snd_card *card;
1522 int result = 0;
1523
1524 if (PCM_RUNTIME_CHECK(substream))
1525 return -ENXIO;
1526 runtime = substream->runtime;
1527 card = substream->pcm->card;
1528
1529 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1530 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1531 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1532 return -EBADFD;
1533
1534 snd_pcm_stream_lock_irq(substream);
1535 /* resume pause */
1536 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1537 snd_pcm_pause(substream, 0);
1538
1539 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1540 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1541 snd_pcm_stream_unlock_irq(substream);
1542
1543 return result;
1544 }
1545
1546
1547 /* WARNING: Don't forget to fput back the file */
1548 static struct file *snd_pcm_file_fd(int fd)
1549 {
1550 struct file *file;
1551 struct inode *inode;
1552 unsigned int minor;
1553
1554 file = fget(fd);
1555 if (!file)
1556 return NULL;
1557 inode = file->f_path.dentry->d_inode;
1558 if (!S_ISCHR(inode->i_mode) ||
1559 imajor(inode) != snd_major) {
1560 fput(file);
1561 return NULL;
1562 }
1563 minor = iminor(inode);
1564 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1565 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1566 fput(file);
1567 return NULL;
1568 }
1569 return file;
1570 }
1571
1572 /*
1573 * PCM link handling
1574 */
1575 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1576 {
1577 int res = 0;
1578 struct file *file;
1579 struct snd_pcm_file *pcm_file;
1580 struct snd_pcm_substream *substream1;
1581
1582 file = snd_pcm_file_fd(fd);
1583 if (!file)
1584 return -EBADFD;
1585 pcm_file = file->private_data;
1586 substream1 = pcm_file->substream;
1587 down_write(&snd_pcm_link_rwsem);
1588 write_lock_irq(&snd_pcm_link_rwlock);
1589 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1590 substream->runtime->status->state != substream1->runtime->status->state) {
1591 res = -EBADFD;
1592 goto _end;
1593 }
1594 if (snd_pcm_stream_linked(substream1)) {
1595 res = -EALREADY;
1596 goto _end;
1597 }
1598 if (!snd_pcm_stream_linked(substream)) {
1599 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1600 if (substream->group == NULL) {
1601 res = -ENOMEM;
1602 goto _end;
1603 }
1604 spin_lock_init(&substream->group->lock);
1605 INIT_LIST_HEAD(&substream->group->substreams);
1606 list_add_tail(&substream->link_list, &substream->group->substreams);
1607 substream->group->count = 1;
1608 }
1609 list_add_tail(&substream1->link_list, &substream->group->substreams);
1610 substream->group->count++;
1611 substream1->group = substream->group;
1612 _end:
1613 write_unlock_irq(&snd_pcm_link_rwlock);
1614 up_write(&snd_pcm_link_rwsem);
1615 fput(file);
1616 return res;
1617 }
1618
1619 static void relink_to_local(struct snd_pcm_substream *substream)
1620 {
1621 substream->group = &substream->self_group;
1622 INIT_LIST_HEAD(&substream->self_group.substreams);
1623 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1624 }
1625
1626 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1627 {
1628 struct snd_pcm_substream *s;
1629 int res = 0;
1630
1631 down_write(&snd_pcm_link_rwsem);
1632 write_lock_irq(&snd_pcm_link_rwlock);
1633 if (!snd_pcm_stream_linked(substream)) {
1634 res = -EALREADY;
1635 goto _end;
1636 }
1637 list_del(&substream->link_list);
1638 substream->group->count--;
1639 if (substream->group->count == 1) { /* detach the last stream, too */
1640 snd_pcm_group_for_each_entry(s, substream) {
1641 relink_to_local(s);
1642 break;
1643 }
1644 kfree(substream->group);
1645 }
1646 relink_to_local(substream);
1647 _end:
1648 write_unlock_irq(&snd_pcm_link_rwlock);
1649 up_write(&snd_pcm_link_rwsem);
1650 return res;
1651 }
1652
1653 /*
1654 * hw configurator
1655 */
1656 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1657 struct snd_pcm_hw_rule *rule)
1658 {
1659 struct snd_interval t;
1660 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1661 hw_param_interval_c(params, rule->deps[1]), &t);
1662 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1663 }
1664
1665 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1666 struct snd_pcm_hw_rule *rule)
1667 {
1668 struct snd_interval t;
1669 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1670 hw_param_interval_c(params, rule->deps[1]), &t);
1671 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1672 }
1673
1674 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1675 struct snd_pcm_hw_rule *rule)
1676 {
1677 struct snd_interval t;
1678 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1679 hw_param_interval_c(params, rule->deps[1]),
1680 (unsigned long) rule->private, &t);
1681 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1682 }
1683
1684 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1685 struct snd_pcm_hw_rule *rule)
1686 {
1687 struct snd_interval t;
1688 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1689 (unsigned long) rule->private,
1690 hw_param_interval_c(params, rule->deps[1]), &t);
1691 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1692 }
1693
1694 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1695 struct snd_pcm_hw_rule *rule)
1696 {
1697 unsigned int k;
1698 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1699 struct snd_mask m;
1700 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1701 snd_mask_any(&m);
1702 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1703 int bits;
1704 if (! snd_mask_test(mask, k))
1705 continue;
1706 bits = snd_pcm_format_physical_width(k);
1707 if (bits <= 0)
1708 continue; /* ignore invalid formats */
1709 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1710 snd_mask_reset(&m, k);
1711 }
1712 return snd_mask_refine(mask, &m);
1713 }
1714
1715 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1716 struct snd_pcm_hw_rule *rule)
1717 {
1718 struct snd_interval t;
1719 unsigned int k;
1720 t.min = UINT_MAX;
1721 t.max = 0;
1722 t.openmin = 0;
1723 t.openmax = 0;
1724 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1725 int bits;
1726 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1727 continue;
1728 bits = snd_pcm_format_physical_width(k);
1729 if (bits <= 0)
1730 continue; /* ignore invalid formats */
1731 if (t.min > (unsigned)bits)
1732 t.min = bits;
1733 if (t.max < (unsigned)bits)
1734 t.max = bits;
1735 }
1736 t.integer = 1;
1737 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1738 }
1739
1740 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1741 #error "Change this table"
1742 #endif
1743
1744 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1745 48000, 64000, 88200, 96000, 176400, 192000 };
1746
1747 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1748 .count = ARRAY_SIZE(rates),
1749 .list = rates,
1750 };
1751
1752 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1753 struct snd_pcm_hw_rule *rule)
1754 {
1755 struct snd_pcm_hardware *hw = rule->private;
1756 return snd_interval_list(hw_param_interval(params, rule->var),
1757 snd_pcm_known_rates.count,
1758 snd_pcm_known_rates.list, hw->rates);
1759 }
1760
1761 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1762 struct snd_pcm_hw_rule *rule)
1763 {
1764 struct snd_interval t;
1765 struct snd_pcm_substream *substream = rule->private;
1766 t.min = 0;
1767 t.max = substream->buffer_bytes_max;
1768 t.openmin = 0;
1769 t.openmax = 0;
1770 t.integer = 1;
1771 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1772 }
1773
1774 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1775 {
1776 struct snd_pcm_runtime *runtime = substream->runtime;
1777 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1778 int k, err;
1779
1780 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1781 snd_mask_any(constrs_mask(constrs, k));
1782 }
1783
1784 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1785 snd_interval_any(constrs_interval(constrs, k));
1786 }
1787
1788 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1789 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1790 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1791 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1792 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1793
1794 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1795 snd_pcm_hw_rule_format, NULL,
1796 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1797 if (err < 0)
1798 return err;
1799 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1800 snd_pcm_hw_rule_sample_bits, NULL,
1801 SNDRV_PCM_HW_PARAM_FORMAT,
1802 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1803 if (err < 0)
1804 return err;
1805 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1806 snd_pcm_hw_rule_div, NULL,
1807 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1808 if (err < 0)
1809 return err;
1810 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1811 snd_pcm_hw_rule_mul, NULL,
1812 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1813 if (err < 0)
1814 return err;
1815 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1816 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1817 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1818 if (err < 0)
1819 return err;
1820 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1821 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1822 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1823 if (err < 0)
1824 return err;
1825 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1826 snd_pcm_hw_rule_div, NULL,
1827 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1828 if (err < 0)
1829 return err;
1830 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1831 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1832 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1833 if (err < 0)
1834 return err;
1835 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1836 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1837 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1838 if (err < 0)
1839 return err;
1840 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1841 snd_pcm_hw_rule_div, NULL,
1842 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1843 if (err < 0)
1844 return err;
1845 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1846 snd_pcm_hw_rule_div, NULL,
1847 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1848 if (err < 0)
1849 return err;
1850 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1851 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1852 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1853 if (err < 0)
1854 return err;
1855 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1856 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1857 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1858 if (err < 0)
1859 return err;
1860 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1861 snd_pcm_hw_rule_mul, NULL,
1862 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1863 if (err < 0)
1864 return err;
1865 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1866 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1867 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1868 if (err < 0)
1869 return err;
1870 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1871 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1872 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1873 if (err < 0)
1874 return err;
1875 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1876 snd_pcm_hw_rule_muldivk, (void*) 8,
1877 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1878 if (err < 0)
1879 return err;
1880 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1881 snd_pcm_hw_rule_muldivk, (void*) 8,
1882 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1883 if (err < 0)
1884 return err;
1885 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1886 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1887 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1888 if (err < 0)
1889 return err;
1890 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1891 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1892 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1893 if (err < 0)
1894 return err;
1895 return 0;
1896 }
1897
1898 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1899 {
1900 struct snd_pcm_runtime *runtime = substream->runtime;
1901 struct snd_pcm_hardware *hw = &runtime->hw;
1902 int err;
1903 unsigned int mask = 0;
1904
1905 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1906 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1907 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1908 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1909 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1910 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1911 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1912 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1913 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1914 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1915 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1916 }
1917 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1918 if (err < 0)
1919 return err;
1920
1921 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1922 if (err < 0)
1923 return err;
1924
1925 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1926 if (err < 0)
1927 return err;
1928
1929 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1930 hw->channels_min, hw->channels_max);
1931 if (err < 0)
1932 return err;
1933
1934 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1935 hw->rate_min, hw->rate_max);
1936 if (err < 0)
1937 return err;
1938
1939 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1940 hw->period_bytes_min, hw->period_bytes_max);
1941 if (err < 0)
1942 return err;
1943
1944 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1945 hw->periods_min, hw->periods_max);
1946 if (err < 0)
1947 return err;
1948
1949 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1950 hw->period_bytes_min, hw->buffer_bytes_max);
1951 if (err < 0)
1952 return err;
1953
1954 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1955 snd_pcm_hw_rule_buffer_bytes_max, substream,
1956 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1957 if (err < 0)
1958 return err;
1959
1960 /* FIXME: remove */
1961 if (runtime->dma_bytes) {
1962 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1963 if (err < 0)
1964 return -EINVAL;
1965 }
1966
1967 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1968 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1969 snd_pcm_hw_rule_rate, hw,
1970 SNDRV_PCM_HW_PARAM_RATE, -1);
1971 if (err < 0)
1972 return err;
1973 }
1974
1975 /* FIXME: this belong to lowlevel */
1976 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1977
1978 return 0;
1979 }
1980
1981 static void pcm_release_private(struct snd_pcm_substream *substream)
1982 {
1983 snd_pcm_unlink(substream);
1984 }
1985
1986 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1987 {
1988 substream->ref_count--;
1989 if (substream->ref_count > 0)
1990 return;
1991
1992 snd_pcm_drop(substream);
1993 if (substream->hw_opened) {
1994 if (substream->ops->hw_free != NULL)
1995 substream->ops->hw_free(substream);
1996 substream->ops->close(substream);
1997 substream->hw_opened = 0;
1998 }
1999 if (pm_qos_request_active(&substream->latency_pm_qos_req))
2000 pm_qos_remove_request(&substream->latency_pm_qos_req);
2001 if (substream->pcm_release) {
2002 substream->pcm_release(substream);
2003 substream->pcm_release = NULL;
2004 }
2005 snd_pcm_detach_substream(substream);
2006 }
2007
2008 EXPORT_SYMBOL(snd_pcm_release_substream);
2009
2010 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2011 struct file *file,
2012 struct snd_pcm_substream **rsubstream)
2013 {
2014 struct snd_pcm_substream *substream;
2015 int err;
2016
2017 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2018 if (err < 0)
2019 return err;
2020 if (substream->ref_count > 1) {
2021 *rsubstream = substream;
2022 return 0;
2023 }
2024
2025 err = snd_pcm_hw_constraints_init(substream);
2026 if (err < 0) {
2027 snd_printd("snd_pcm_hw_constraints_init failed\n");
2028 goto error;
2029 }
2030
2031 if ((err = substream->ops->open(substream)) < 0)
2032 goto error;
2033
2034 substream->hw_opened = 1;
2035
2036 err = snd_pcm_hw_constraints_complete(substream);
2037 if (err < 0) {
2038 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2039 goto error;
2040 }
2041
2042 *rsubstream = substream;
2043 return 0;
2044
2045 error:
2046 snd_pcm_release_substream(substream);
2047 return err;
2048 }
2049
2050 EXPORT_SYMBOL(snd_pcm_open_substream);
2051
2052 static int snd_pcm_open_file(struct file *file,
2053 struct snd_pcm *pcm,
2054 int stream,
2055 struct snd_pcm_file **rpcm_file)
2056 {
2057 struct snd_pcm_file *pcm_file;
2058 struct snd_pcm_substream *substream;
2059 struct snd_pcm_str *str;
2060 int err;
2061
2062 if (rpcm_file)
2063 *rpcm_file = NULL;
2064
2065 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2066 if (err < 0)
2067 return err;
2068
2069 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2070 if (pcm_file == NULL) {
2071 snd_pcm_release_substream(substream);
2072 return -ENOMEM;
2073 }
2074 pcm_file->substream = substream;
2075 if (substream->ref_count == 1) {
2076 str = substream->pstr;
2077 substream->file = pcm_file;
2078 substream->pcm_release = pcm_release_private;
2079 }
2080 file->private_data = pcm_file;
2081 if (rpcm_file)
2082 *rpcm_file = pcm_file;
2083 return 0;
2084 }
2085
2086 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2087 {
2088 struct snd_pcm *pcm;
2089 int err = nonseekable_open(inode, file);
2090 if (err < 0)
2091 return err;
2092 pcm = snd_lookup_minor_data(iminor(inode),
2093 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2094 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2095 }
2096
2097 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2098 {
2099 struct snd_pcm *pcm;
2100 int err = nonseekable_open(inode, file);
2101 if (err < 0)
2102 return err;
2103 pcm = snd_lookup_minor_data(iminor(inode),
2104 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2105 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2106 }
2107
2108 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2109 {
2110 int err;
2111 struct snd_pcm_file *pcm_file;
2112 wait_queue_t wait;
2113
2114 if (pcm == NULL) {
2115 err = -ENODEV;
2116 goto __error1;
2117 }
2118 err = snd_card_file_add(pcm->card, file);
2119 if (err < 0)
2120 goto __error1;
2121 if (!try_module_get(pcm->card->module)) {
2122 err = -EFAULT;
2123 goto __error2;
2124 }
2125 init_waitqueue_entry(&wait, current);
2126 add_wait_queue(&pcm->open_wait, &wait);
2127 mutex_lock(&pcm->open_mutex);
2128 while (1) {
2129 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2130 if (err >= 0)
2131 break;
2132 if (err == -EAGAIN) {
2133 if (file->f_flags & O_NONBLOCK) {
2134 err = -EBUSY;
2135 break;
2136 }
2137 } else
2138 break;
2139 set_current_state(TASK_INTERRUPTIBLE);
2140 mutex_unlock(&pcm->open_mutex);
2141 schedule();
2142 mutex_lock(&pcm->open_mutex);
2143 if (signal_pending(current)) {
2144 err = -ERESTARTSYS;
2145 break;
2146 }
2147 }
2148 remove_wait_queue(&pcm->open_wait, &wait);
2149 mutex_unlock(&pcm->open_mutex);
2150 if (err < 0)
2151 goto __error;
2152 return err;
2153
2154 __error:
2155 module_put(pcm->card->module);
2156 __error2:
2157 snd_card_file_remove(pcm->card, file);
2158 __error1:
2159 return err;
2160 }
2161
2162 static int snd_pcm_release(struct inode *inode, struct file *file)
2163 {
2164 struct snd_pcm *pcm;
2165 struct snd_pcm_substream *substream;
2166 struct snd_pcm_file *pcm_file;
2167
2168 pcm_file = file->private_data;
2169 substream = pcm_file->substream;
2170 if (snd_BUG_ON(!substream))
2171 return -ENXIO;
2172 pcm = substream->pcm;
2173 mutex_lock(&pcm->open_mutex);
2174 snd_pcm_release_substream(substream);
2175 kfree(pcm_file);
2176 mutex_unlock(&pcm->open_mutex);
2177 wake_up(&pcm->open_wait);
2178 module_put(pcm->card->module);
2179 snd_card_file_remove(pcm->card, file);
2180 return 0;
2181 }
2182
2183 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2184 snd_pcm_uframes_t frames)
2185 {
2186 struct snd_pcm_runtime *runtime = substream->runtime;
2187 snd_pcm_sframes_t appl_ptr;
2188 snd_pcm_sframes_t ret;
2189 snd_pcm_sframes_t hw_avail;
2190
2191 if (frames == 0)
2192 return 0;
2193
2194 snd_pcm_stream_lock_irq(substream);
2195 switch (runtime->status->state) {
2196 case SNDRV_PCM_STATE_PREPARED:
2197 break;
2198 case SNDRV_PCM_STATE_DRAINING:
2199 case SNDRV_PCM_STATE_RUNNING:
2200 if (snd_pcm_update_hw_ptr(substream) >= 0)
2201 break;
2202 /* Fall through */
2203 case SNDRV_PCM_STATE_XRUN:
2204 ret = -EPIPE;
2205 goto __end;
2206 case SNDRV_PCM_STATE_SUSPENDED:
2207 ret = -ESTRPIPE;
2208 goto __end;
2209 default:
2210 ret = -EBADFD;
2211 goto __end;
2212 }
2213
2214 hw_avail = snd_pcm_playback_hw_avail(runtime);
2215 if (hw_avail <= 0) {
2216 ret = 0;
2217 goto __end;
2218 }
2219 if (frames > (snd_pcm_uframes_t)hw_avail)
2220 frames = hw_avail;
2221 appl_ptr = runtime->control->appl_ptr - frames;
2222 if (appl_ptr < 0)
2223 appl_ptr += runtime->boundary;
2224 runtime->control->appl_ptr = appl_ptr;
2225 ret = frames;
2226 __end:
2227 snd_pcm_stream_unlock_irq(substream);
2228 return ret;
2229 }
2230
2231 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2232 snd_pcm_uframes_t frames)
2233 {
2234 struct snd_pcm_runtime *runtime = substream->runtime;
2235 snd_pcm_sframes_t appl_ptr;
2236 snd_pcm_sframes_t ret;
2237 snd_pcm_sframes_t hw_avail;
2238
2239 if (frames == 0)
2240 return 0;
2241
2242 snd_pcm_stream_lock_irq(substream);
2243 switch (runtime->status->state) {
2244 case SNDRV_PCM_STATE_PREPARED:
2245 case SNDRV_PCM_STATE_DRAINING:
2246 break;
2247 case SNDRV_PCM_STATE_RUNNING:
2248 if (snd_pcm_update_hw_ptr(substream) >= 0)
2249 break;
2250 /* Fall through */
2251 case SNDRV_PCM_STATE_XRUN:
2252 ret = -EPIPE;
2253 goto __end;
2254 case SNDRV_PCM_STATE_SUSPENDED:
2255 ret = -ESTRPIPE;
2256 goto __end;
2257 default:
2258 ret = -EBADFD;
2259 goto __end;
2260 }
2261
2262 hw_avail = snd_pcm_capture_hw_avail(runtime);
2263 if (hw_avail <= 0) {
2264 ret = 0;
2265 goto __end;
2266 }
2267 if (frames > (snd_pcm_uframes_t)hw_avail)
2268 frames = hw_avail;
2269 appl_ptr = runtime->control->appl_ptr - frames;
2270 if (appl_ptr < 0)
2271 appl_ptr += runtime->boundary;
2272 runtime->control->appl_ptr = appl_ptr;
2273 ret = frames;
2274 __end:
2275 snd_pcm_stream_unlock_irq(substream);
2276 return ret;
2277 }
2278
2279 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2280 snd_pcm_uframes_t frames)
2281 {
2282 struct snd_pcm_runtime *runtime = substream->runtime;
2283 snd_pcm_sframes_t appl_ptr;
2284 snd_pcm_sframes_t ret;
2285 snd_pcm_sframes_t avail;
2286
2287 if (frames == 0)
2288 return 0;
2289
2290 snd_pcm_stream_lock_irq(substream);
2291 switch (runtime->status->state) {
2292 case SNDRV_PCM_STATE_PREPARED:
2293 case SNDRV_PCM_STATE_PAUSED:
2294 break;
2295 case SNDRV_PCM_STATE_DRAINING:
2296 case SNDRV_PCM_STATE_RUNNING:
2297 if (snd_pcm_update_hw_ptr(substream) >= 0)
2298 break;
2299 /* Fall through */
2300 case SNDRV_PCM_STATE_XRUN:
2301 ret = -EPIPE;
2302 goto __end;
2303 case SNDRV_PCM_STATE_SUSPENDED:
2304 ret = -ESTRPIPE;
2305 goto __end;
2306 default:
2307 ret = -EBADFD;
2308 goto __end;
2309 }
2310
2311 avail = snd_pcm_playback_avail(runtime);
2312 if (avail <= 0) {
2313 ret = 0;
2314 goto __end;
2315 }
2316 if (frames > (snd_pcm_uframes_t)avail)
2317 frames = avail;
2318 appl_ptr = runtime->control->appl_ptr + frames;
2319 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2320 appl_ptr -= runtime->boundary;
2321 runtime->control->appl_ptr = appl_ptr;
2322 ret = frames;
2323 __end:
2324 snd_pcm_stream_unlock_irq(substream);
2325 return ret;
2326 }
2327
2328 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2329 snd_pcm_uframes_t frames)
2330 {
2331 struct snd_pcm_runtime *runtime = substream->runtime;
2332 snd_pcm_sframes_t appl_ptr;
2333 snd_pcm_sframes_t ret;
2334 snd_pcm_sframes_t avail;
2335
2336 if (frames == 0)
2337 return 0;
2338
2339 snd_pcm_stream_lock_irq(substream);
2340 switch (runtime->status->state) {
2341 case SNDRV_PCM_STATE_PREPARED:
2342 case SNDRV_PCM_STATE_DRAINING:
2343 case SNDRV_PCM_STATE_PAUSED:
2344 break;
2345 case SNDRV_PCM_STATE_RUNNING:
2346 if (snd_pcm_update_hw_ptr(substream) >= 0)
2347 break;
2348 /* Fall through */
2349 case SNDRV_PCM_STATE_XRUN:
2350 ret = -EPIPE;
2351 goto __end;
2352 case SNDRV_PCM_STATE_SUSPENDED:
2353 ret = -ESTRPIPE;
2354 goto __end;
2355 default:
2356 ret = -EBADFD;
2357 goto __end;
2358 }
2359
2360 avail = snd_pcm_capture_avail(runtime);
2361 if (avail <= 0) {
2362 ret = 0;
2363 goto __end;
2364 }
2365 if (frames > (snd_pcm_uframes_t)avail)
2366 frames = avail;
2367 appl_ptr = runtime->control->appl_ptr + frames;
2368 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2369 appl_ptr -= runtime->boundary;
2370 runtime->control->appl_ptr = appl_ptr;
2371 ret = frames;
2372 __end:
2373 snd_pcm_stream_unlock_irq(substream);
2374 return ret;
2375 }
2376
2377 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2378 {
2379 struct snd_pcm_runtime *runtime = substream->runtime;
2380 int err;
2381
2382 snd_pcm_stream_lock_irq(substream);
2383 switch (runtime->status->state) {
2384 case SNDRV_PCM_STATE_DRAINING:
2385 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2386 goto __badfd;
2387 case SNDRV_PCM_STATE_RUNNING:
2388 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2389 break;
2390 /* Fall through */
2391 case SNDRV_PCM_STATE_PREPARED:
2392 case SNDRV_PCM_STATE_SUSPENDED:
2393 err = 0;
2394 break;
2395 case SNDRV_PCM_STATE_XRUN:
2396 err = -EPIPE;
2397 break;
2398 default:
2399 __badfd:
2400 err = -EBADFD;
2401 break;
2402 }
2403 snd_pcm_stream_unlock_irq(substream);
2404 return err;
2405 }
2406
2407 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2408 snd_pcm_sframes_t __user *res)
2409 {
2410 struct snd_pcm_runtime *runtime = substream->runtime;
2411 int err;
2412 snd_pcm_sframes_t n = 0;
2413
2414 snd_pcm_stream_lock_irq(substream);
2415 switch (runtime->status->state) {
2416 case SNDRV_PCM_STATE_DRAINING:
2417 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2418 goto __badfd;
2419 case SNDRV_PCM_STATE_RUNNING:
2420 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2421 break;
2422 /* Fall through */
2423 case SNDRV_PCM_STATE_PREPARED:
2424 case SNDRV_PCM_STATE_SUSPENDED:
2425 err = 0;
2426 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2427 n = snd_pcm_playback_hw_avail(runtime);
2428 else
2429 n = snd_pcm_capture_avail(runtime);
2430 n += runtime->delay;
2431 break;
2432 case SNDRV_PCM_STATE_XRUN:
2433 err = -EPIPE;
2434 break;
2435 default:
2436 __badfd:
2437 err = -EBADFD;
2438 break;
2439 }
2440 snd_pcm_stream_unlock_irq(substream);
2441 if (!err)
2442 if (put_user(n, res))
2443 err = -EFAULT;
2444 return err;
2445 }
2446
2447 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2448 struct snd_pcm_sync_ptr __user *_sync_ptr)
2449 {
2450 struct snd_pcm_runtime *runtime = substream->runtime;
2451 struct snd_pcm_sync_ptr sync_ptr;
2452 volatile struct snd_pcm_mmap_status *status;
2453 volatile struct snd_pcm_mmap_control *control;
2454 int err;
2455
2456 memset(&sync_ptr, 0, sizeof(sync_ptr));
2457 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2458 return -EFAULT;
2459 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2460 return -EFAULT;
2461 status = runtime->status;
2462 control = runtime->control;
2463 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2464 err = snd_pcm_hwsync(substream);
2465 if (err < 0)
2466 return err;
2467 }
2468 snd_pcm_stream_lock_irq(substream);
2469 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2470 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2471 else
2472 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2473 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2474 control->avail_min = sync_ptr.c.control.avail_min;
2475 else
2476 sync_ptr.c.control.avail_min = control->avail_min;
2477 sync_ptr.s.status.state = status->state;
2478 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2479 sync_ptr.s.status.tstamp = status->tstamp;
2480 sync_ptr.s.status.suspended_state = status->suspended_state;
2481 snd_pcm_stream_unlock_irq(substream);
2482 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2483 return -EFAULT;
2484 return 0;
2485 }
2486
2487 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2488 {
2489 struct snd_pcm_runtime *runtime = substream->runtime;
2490 int arg;
2491
2492 if (get_user(arg, _arg))
2493 return -EFAULT;
2494 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2495 return -EINVAL;
2496 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2497 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2498 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2499 return 0;
2500 }
2501
2502 static int snd_pcm_common_ioctl1(struct file *file,
2503 struct snd_pcm_substream *substream,
2504 unsigned int cmd, void __user *arg)
2505 {
2506 switch (cmd) {
2507 case SNDRV_PCM_IOCTL_PVERSION:
2508 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2509 case SNDRV_PCM_IOCTL_INFO:
2510 return snd_pcm_info_user(substream, arg);
2511 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2512 return 0;
2513 case SNDRV_PCM_IOCTL_TTSTAMP:
2514 return snd_pcm_tstamp(substream, arg);
2515 case SNDRV_PCM_IOCTL_HW_REFINE:
2516 return snd_pcm_hw_refine_user(substream, arg);
2517 case SNDRV_PCM_IOCTL_HW_PARAMS:
2518 return snd_pcm_hw_params_user(substream, arg);
2519 case SNDRV_PCM_IOCTL_HW_FREE:
2520 return snd_pcm_hw_free(substream);
2521 case SNDRV_PCM_IOCTL_SW_PARAMS:
2522 return snd_pcm_sw_params_user(substream, arg);
2523 case SNDRV_PCM_IOCTL_STATUS:
2524 return snd_pcm_status_user(substream, arg);
2525 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2526 return snd_pcm_channel_info_user(substream, arg);
2527 case SNDRV_PCM_IOCTL_PREPARE:
2528 return snd_pcm_prepare(substream, file);
2529 case SNDRV_PCM_IOCTL_RESET:
2530 return snd_pcm_reset(substream);
2531 case SNDRV_PCM_IOCTL_START:
2532 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2533 case SNDRV_PCM_IOCTL_LINK:
2534 return snd_pcm_link(substream, (int)(unsigned long) arg);
2535 case SNDRV_PCM_IOCTL_UNLINK:
2536 return snd_pcm_unlink(substream);
2537 case SNDRV_PCM_IOCTL_RESUME:
2538 return snd_pcm_resume(substream);
2539 case SNDRV_PCM_IOCTL_XRUN:
2540 return snd_pcm_xrun(substream);
2541 case SNDRV_PCM_IOCTL_HWSYNC:
2542 return snd_pcm_hwsync(substream);
2543 case SNDRV_PCM_IOCTL_DELAY:
2544 return snd_pcm_delay(substream, arg);
2545 case SNDRV_PCM_IOCTL_SYNC_PTR:
2546 return snd_pcm_sync_ptr(substream, arg);
2547 #ifdef CONFIG_SND_SUPPORT_OLD_API
2548 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2549 return snd_pcm_hw_refine_old_user(substream, arg);
2550 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2551 return snd_pcm_hw_params_old_user(substream, arg);
2552 #endif
2553 case SNDRV_PCM_IOCTL_DRAIN:
2554 return snd_pcm_drain(substream, file);
2555 case SNDRV_PCM_IOCTL_DROP:
2556 return snd_pcm_drop(substream);
2557 case SNDRV_PCM_IOCTL_PAUSE:
2558 {
2559 int res;
2560 snd_pcm_stream_lock_irq(substream);
2561 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2562 snd_pcm_stream_unlock_irq(substream);
2563 return res;
2564 }
2565 }
2566 snd_printd("unknown ioctl = 0x%x\n", cmd);
2567 return -ENOTTY;
2568 }
2569
2570 static int snd_pcm_playback_ioctl1(struct file *file,
2571 struct snd_pcm_substream *substream,
2572 unsigned int cmd, void __user *arg)
2573 {
2574 if (snd_BUG_ON(!substream))
2575 return -ENXIO;
2576 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2577 return -EINVAL;
2578 switch (cmd) {
2579 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2580 {
2581 struct snd_xferi xferi;
2582 struct snd_xferi __user *_xferi = arg;
2583 struct snd_pcm_runtime *runtime = substream->runtime;
2584 snd_pcm_sframes_t result;
2585 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2586 return -EBADFD;
2587 if (put_user(0, &_xferi->result))
2588 return -EFAULT;
2589 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2590 return -EFAULT;
2591 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2592 __put_user(result, &_xferi->result);
2593 return result < 0 ? result : 0;
2594 }
2595 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2596 {
2597 struct snd_xfern xfern;
2598 struct snd_xfern __user *_xfern = arg;
2599 struct snd_pcm_runtime *runtime = substream->runtime;
2600 void __user **bufs;
2601 snd_pcm_sframes_t result;
2602 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2603 return -EBADFD;
2604 if (runtime->channels > 128)
2605 return -EINVAL;
2606 if (put_user(0, &_xfern->result))
2607 return -EFAULT;
2608 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2609 return -EFAULT;
2610
2611 bufs = memdup_user(xfern.bufs,
2612 sizeof(void *) * runtime->channels);
2613 if (IS_ERR(bufs))
2614 return PTR_ERR(bufs);
2615 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2616 kfree(bufs);
2617 __put_user(result, &_xfern->result);
2618 return result < 0 ? result : 0;
2619 }
2620 case SNDRV_PCM_IOCTL_REWIND:
2621 {
2622 snd_pcm_uframes_t frames;
2623 snd_pcm_uframes_t __user *_frames = arg;
2624 snd_pcm_sframes_t result;
2625 if (get_user(frames, _frames))
2626 return -EFAULT;
2627 if (put_user(0, _frames))
2628 return -EFAULT;
2629 result = snd_pcm_playback_rewind(substream, frames);
2630 __put_user(result, _frames);
2631 return result < 0 ? result : 0;
2632 }
2633 case SNDRV_PCM_IOCTL_FORWARD:
2634 {
2635 snd_pcm_uframes_t frames;
2636 snd_pcm_uframes_t __user *_frames = arg;
2637 snd_pcm_sframes_t result;
2638 if (get_user(frames, _frames))
2639 return -EFAULT;
2640 if (put_user(0, _frames))
2641 return -EFAULT;
2642 result = snd_pcm_playback_forward(substream, frames);
2643 __put_user(result, _frames);
2644 return result < 0 ? result : 0;
2645 }
2646 }
2647 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2648 }
2649
2650 static int snd_pcm_capture_ioctl1(struct file *file,
2651 struct snd_pcm_substream *substream,
2652 unsigned int cmd, void __user *arg)
2653 {
2654 if (snd_BUG_ON(!substream))
2655 return -ENXIO;
2656 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2657 return -EINVAL;
2658 switch (cmd) {
2659 case SNDRV_PCM_IOCTL_READI_FRAMES:
2660 {
2661 struct snd_xferi xferi;
2662 struct snd_xferi __user *_xferi = arg;
2663 struct snd_pcm_runtime *runtime = substream->runtime;
2664 snd_pcm_sframes_t result;
2665 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2666 return -EBADFD;
2667 if (put_user(0, &_xferi->result))
2668 return -EFAULT;
2669 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2670 return -EFAULT;
2671 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2672 __put_user(result, &_xferi->result);
2673 return result < 0 ? result : 0;
2674 }
2675 case SNDRV_PCM_IOCTL_READN_FRAMES:
2676 {
2677 struct snd_xfern xfern;
2678 struct snd_xfern __user *_xfern = arg;
2679 struct snd_pcm_runtime *runtime = substream->runtime;
2680 void *bufs;
2681 snd_pcm_sframes_t result;
2682 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2683 return -EBADFD;
2684 if (runtime->channels > 128)
2685 return -EINVAL;
2686 if (put_user(0, &_xfern->result))
2687 return -EFAULT;
2688 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2689 return -EFAULT;
2690
2691 bufs = memdup_user(xfern.bufs,
2692 sizeof(void *) * runtime->channels);
2693 if (IS_ERR(bufs))
2694 return PTR_ERR(bufs);
2695 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2696 kfree(bufs);
2697 __put_user(result, &_xfern->result);
2698 return result < 0 ? result : 0;
2699 }
2700 case SNDRV_PCM_IOCTL_REWIND:
2701 {
2702 snd_pcm_uframes_t frames;
2703 snd_pcm_uframes_t __user *_frames = arg;
2704 snd_pcm_sframes_t result;
2705 if (get_user(frames, _frames))
2706 return -EFAULT;
2707 if (put_user(0, _frames))
2708 return -EFAULT;
2709 result = snd_pcm_capture_rewind(substream, frames);
2710 __put_user(result, _frames);
2711 return result < 0 ? result : 0;
2712 }
2713 case SNDRV_PCM_IOCTL_FORWARD:
2714 {
2715 snd_pcm_uframes_t frames;
2716 snd_pcm_uframes_t __user *_frames = arg;
2717 snd_pcm_sframes_t result;
2718 if (get_user(frames, _frames))
2719 return -EFAULT;
2720 if (put_user(0, _frames))
2721 return -EFAULT;
2722 result = snd_pcm_capture_forward(substream, frames);
2723 __put_user(result, _frames);
2724 return result < 0 ? result : 0;
2725 }
2726 }
2727 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2728 }
2729
2730 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2731 unsigned long arg)
2732 {
2733 struct snd_pcm_file *pcm_file;
2734
2735 pcm_file = file->private_data;
2736
2737 if (((cmd >> 8) & 0xff) != 'A')
2738 return -ENOTTY;
2739
2740 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2741 (void __user *)arg);
2742 }
2743
2744 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2745 unsigned long arg)
2746 {
2747 struct snd_pcm_file *pcm_file;
2748
2749 pcm_file = file->private_data;
2750
2751 if (((cmd >> 8) & 0xff) != 'A')
2752 return -ENOTTY;
2753
2754 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2755 (void __user *)arg);
2756 }
2757
2758 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2759 unsigned int cmd, void *arg)
2760 {
2761 mm_segment_t fs;
2762 int result;
2763
2764 fs = snd_enter_user();
2765 switch (substream->stream) {
2766 case SNDRV_PCM_STREAM_PLAYBACK:
2767 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2768 (void __user *)arg);
2769 break;
2770 case SNDRV_PCM_STREAM_CAPTURE:
2771 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2772 (void __user *)arg);
2773 break;
2774 default:
2775 result = -EINVAL;
2776 break;
2777 }
2778 snd_leave_user(fs);
2779 return result;
2780 }
2781
2782 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2783
2784 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2785 loff_t * offset)
2786 {
2787 struct snd_pcm_file *pcm_file;
2788 struct snd_pcm_substream *substream;
2789 struct snd_pcm_runtime *runtime;
2790 snd_pcm_sframes_t result;
2791
2792 pcm_file = file->private_data;
2793 substream = pcm_file->substream;
2794 if (PCM_RUNTIME_CHECK(substream))
2795 return -ENXIO;
2796 runtime = substream->runtime;
2797 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2798 return -EBADFD;
2799 if (!frame_aligned(runtime, count))
2800 return -EINVAL;
2801 count = bytes_to_frames(runtime, count);
2802 result = snd_pcm_lib_read(substream, buf, count);
2803 if (result > 0)
2804 result = frames_to_bytes(runtime, result);
2805 return result;
2806 }
2807
2808 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2809 size_t count, loff_t * offset)
2810 {
2811 struct snd_pcm_file *pcm_file;
2812 struct snd_pcm_substream *substream;
2813 struct snd_pcm_runtime *runtime;
2814 snd_pcm_sframes_t result;
2815
2816 pcm_file = file->private_data;
2817 substream = pcm_file->substream;
2818 if (PCM_RUNTIME_CHECK(substream))
2819 return -ENXIO;
2820 runtime = substream->runtime;
2821 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2822 return -EBADFD;
2823 if (!frame_aligned(runtime, count))
2824 return -EINVAL;
2825 count = bytes_to_frames(runtime, count);
2826 result = snd_pcm_lib_write(substream, buf, count);
2827 if (result > 0)
2828 result = frames_to_bytes(runtime, result);
2829 return result;
2830 }
2831
2832 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2833 unsigned long nr_segs, loff_t pos)
2834
2835 {
2836 struct snd_pcm_file *pcm_file;
2837 struct snd_pcm_substream *substream;
2838 struct snd_pcm_runtime *runtime;
2839 snd_pcm_sframes_t result;
2840 unsigned long i;
2841 void __user **bufs;
2842 snd_pcm_uframes_t frames;
2843
2844 pcm_file = iocb->ki_filp->private_data;
2845 substream = pcm_file->substream;
2846 if (PCM_RUNTIME_CHECK(substream))
2847 return -ENXIO;
2848 runtime = substream->runtime;
2849 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2850 return -EBADFD;
2851 if (nr_segs > 1024 || nr_segs != runtime->channels)
2852 return -EINVAL;
2853 if (!frame_aligned(runtime, iov->iov_len))
2854 return -EINVAL;
2855 frames = bytes_to_samples(runtime, iov->iov_len);
2856 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2857 if (bufs == NULL)
2858 return -ENOMEM;
2859 for (i = 0; i < nr_segs; ++i)
2860 bufs[i] = iov[i].iov_base;
2861 result = snd_pcm_lib_readv(substream, bufs, frames);
2862 if (result > 0)
2863 result = frames_to_bytes(runtime, result);
2864 kfree(bufs);
2865 return result;
2866 }
2867
2868 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2869 unsigned long nr_segs, loff_t pos)
2870 {
2871 struct snd_pcm_file *pcm_file;
2872 struct snd_pcm_substream *substream;
2873 struct snd_pcm_runtime *runtime;
2874 snd_pcm_sframes_t result;
2875 unsigned long i;
2876 void __user **bufs;
2877 snd_pcm_uframes_t frames;
2878
2879 pcm_file = iocb->ki_filp->private_data;
2880 substream = pcm_file->substream;
2881 if (PCM_RUNTIME_CHECK(substream))
2882 return -ENXIO;
2883 runtime = substream->runtime;
2884 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2885 return -EBADFD;
2886 if (nr_segs > 128 || nr_segs != runtime->channels ||
2887 !frame_aligned(runtime, iov->iov_len))
2888 return -EINVAL;
2889 frames = bytes_to_samples(runtime, iov->iov_len);
2890 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2891 if (bufs == NULL)
2892 return -ENOMEM;
2893 for (i = 0; i < nr_segs; ++i)
2894 bufs[i] = iov[i].iov_base;
2895 result = snd_pcm_lib_writev(substream, bufs, frames);
2896 if (result > 0)
2897 result = frames_to_bytes(runtime, result);
2898 kfree(bufs);
2899 return result;
2900 }
2901
2902 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2903 {
2904 struct snd_pcm_file *pcm_file;
2905 struct snd_pcm_substream *substream;
2906 struct snd_pcm_runtime *runtime;
2907 unsigned int mask;
2908 snd_pcm_uframes_t avail;
2909
2910 pcm_file = file->private_data;
2911
2912 substream = pcm_file->substream;
2913 if (PCM_RUNTIME_CHECK(substream))
2914 return -ENXIO;
2915 runtime = substream->runtime;
2916
2917 poll_wait(file, &runtime->sleep, wait);
2918
2919 snd_pcm_stream_lock_irq(substream);
2920 avail = snd_pcm_playback_avail(runtime);
2921 switch (runtime->status->state) {
2922 case SNDRV_PCM_STATE_RUNNING:
2923 case SNDRV_PCM_STATE_PREPARED:
2924 case SNDRV_PCM_STATE_PAUSED:
2925 if (avail >= runtime->control->avail_min) {
2926 mask = POLLOUT | POLLWRNORM;
2927 break;
2928 }
2929 /* Fall through */
2930 case SNDRV_PCM_STATE_DRAINING:
2931 mask = 0;
2932 break;
2933 default:
2934 mask = POLLOUT | POLLWRNORM | POLLERR;
2935 break;
2936 }
2937 snd_pcm_stream_unlock_irq(substream);
2938 return mask;
2939 }
2940
2941 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2942 {
2943 struct snd_pcm_file *pcm_file;
2944 struct snd_pcm_substream *substream;
2945 struct snd_pcm_runtime *runtime;
2946 unsigned int mask;
2947 snd_pcm_uframes_t avail;
2948
2949 pcm_file = file->private_data;
2950
2951 substream = pcm_file->substream;
2952 if (PCM_RUNTIME_CHECK(substream))
2953 return -ENXIO;
2954 runtime = substream->runtime;
2955
2956 poll_wait(file, &runtime->sleep, wait);
2957
2958 snd_pcm_stream_lock_irq(substream);
2959 avail = snd_pcm_capture_avail(runtime);
2960 switch (runtime->status->state) {
2961 case SNDRV_PCM_STATE_RUNNING:
2962 case SNDRV_PCM_STATE_PREPARED:
2963 case SNDRV_PCM_STATE_PAUSED:
2964 if (avail >= runtime->control->avail_min) {
2965 mask = POLLIN | POLLRDNORM;
2966 break;
2967 }
2968 mask = 0;
2969 break;
2970 case SNDRV_PCM_STATE_DRAINING:
2971 if (avail > 0) {
2972 mask = POLLIN | POLLRDNORM;
2973 break;
2974 }
2975 /* Fall through */
2976 default:
2977 mask = POLLIN | POLLRDNORM | POLLERR;
2978 break;
2979 }
2980 snd_pcm_stream_unlock_irq(substream);
2981 return mask;
2982 }
2983
2984 /*
2985 * mmap support
2986 */
2987
2988 /*
2989 * Only on coherent architectures, we can mmap the status and the control records
2990 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2991 */
2992 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2993 /*
2994 * mmap status record
2995 */
2996 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2997 struct vm_fault *vmf)
2998 {
2999 struct snd_pcm_substream *substream = area->vm_private_data;
3000 struct snd_pcm_runtime *runtime;
3001
3002 if (substream == NULL)
3003 return VM_FAULT_SIGBUS;
3004 runtime = substream->runtime;
3005 vmf->page = virt_to_page(runtime->status);
3006 get_page(vmf->page);
3007 return 0;
3008 }
3009
3010 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3011 {
3012 .fault = snd_pcm_mmap_status_fault,
3013 };
3014
3015 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3016 struct vm_area_struct *area)
3017 {
3018 struct snd_pcm_runtime *runtime;
3019 long size;
3020 if (!(area->vm_flags & VM_READ))
3021 return -EINVAL;
3022 runtime = substream->runtime;
3023 size = area->vm_end - area->vm_start;
3024 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3025 return -EINVAL;
3026 area->vm_ops = &snd_pcm_vm_ops_status;
3027 area->vm_private_data = substream;
3028 area->vm_flags |= VM_RESERVED;
3029 return 0;
3030 }
3031
3032 /*
3033 * mmap control record
3034 */
3035 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3036 struct vm_fault *vmf)
3037 {
3038 struct snd_pcm_substream *substream = area->vm_private_data;
3039 struct snd_pcm_runtime *runtime;
3040
3041 if (substream == NULL)
3042 return VM_FAULT_SIGBUS;
3043 runtime = substream->runtime;
3044 vmf->page = virt_to_page(runtime->control);
3045 get_page(vmf->page);
3046 return 0;
3047 }
3048
3049 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3050 {
3051 .fault = snd_pcm_mmap_control_fault,
3052 };
3053
3054 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3055 struct vm_area_struct *area)
3056 {
3057 struct snd_pcm_runtime *runtime;
3058 long size;
3059 if (!(area->vm_flags & VM_READ))
3060 return -EINVAL;
3061 runtime = substream->runtime;
3062 size = area->vm_end - area->vm_start;
3063 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3064 return -EINVAL;
3065 area->vm_ops = &snd_pcm_vm_ops_control;
3066 area->vm_private_data = substream;
3067 area->vm_flags |= VM_RESERVED;
3068 return 0;
3069 }
3070 #else /* ! coherent mmap */
3071 /*
3072 * don't support mmap for status and control records.
3073 */
3074 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3075 struct vm_area_struct *area)
3076 {
3077 return -ENXIO;
3078 }
3079 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3080 struct vm_area_struct *area)
3081 {
3082 return -ENXIO;
3083 }
3084 #endif /* coherent mmap */
3085
3086 static inline struct page *
3087 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3088 {
3089 void *vaddr = substream->runtime->dma_area + ofs;
3090 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3091 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3092 return virt_to_page(CAC_ADDR(vaddr));
3093 #endif
3094 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3095 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3096 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3097 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3098 /* assume dma_handle set via pfn_to_phys() in
3099 * mm/dma-noncoherent.c
3100 */
3101 return pfn_to_page(addr >> PAGE_SHIFT);
3102 }
3103 #endif
3104 return virt_to_page(vaddr);
3105 }
3106
3107 /*
3108 * fault callback for mmapping a RAM page
3109 */
3110 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3111 struct vm_fault *vmf)
3112 {
3113 struct snd_pcm_substream *substream = area->vm_private_data;
3114 struct snd_pcm_runtime *runtime;
3115 unsigned long offset;
3116 struct page * page;
3117 size_t dma_bytes;
3118
3119 if (substream == NULL)
3120 return VM_FAULT_SIGBUS;
3121 runtime = substream->runtime;
3122 offset = vmf->pgoff << PAGE_SHIFT;
3123 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3124 if (offset > dma_bytes - PAGE_SIZE)
3125 return VM_FAULT_SIGBUS;
3126 if (substream->ops->page)
3127 page = substream->ops->page(substream, offset);
3128 else
3129 page = snd_pcm_default_page_ops(substream, offset);
3130 if (!page)
3131 return VM_FAULT_SIGBUS;
3132 get_page(page);
3133 vmf->page = page;
3134 return 0;
3135 }
3136
3137 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3138 .open = snd_pcm_mmap_data_open,
3139 .close = snd_pcm_mmap_data_close,
3140 };
3141
3142 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3143 .open = snd_pcm_mmap_data_open,
3144 .close = snd_pcm_mmap_data_close,
3145 .fault = snd_pcm_mmap_data_fault,
3146 };
3147
3148 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3149 /* This should be defined / handled globally! */
3150 #ifdef CONFIG_ARM
3151 #define ARCH_HAS_DMA_MMAP_COHERENT
3152 #endif
3153 #endif
3154
3155 /*
3156 * mmap the DMA buffer on RAM
3157 */
3158 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3159 struct vm_area_struct *area)
3160 {
3161 area->vm_flags |= VM_RESERVED;
3162 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3163 if (!substream->ops->page &&
3164 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3165 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3166 area,
3167 substream->runtime->dma_area,
3168 substream->runtime->dma_addr,
3169 area->vm_end - area->vm_start);
3170 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3171 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3172 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3173 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3174 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3175 /* mmap with fault handler */
3176 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3177 return 0;
3178 }
3179
3180 /*
3181 * mmap the DMA buffer on I/O memory area
3182 */
3183 #if SNDRV_PCM_INFO_MMAP_IOMEM
3184 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3185 struct vm_area_struct *area)
3186 {
3187 long size;
3188 unsigned long offset;
3189
3190 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3191 area->vm_flags |= VM_IO;
3192 size = area->vm_end - area->vm_start;
3193 offset = area->vm_pgoff << PAGE_SHIFT;
3194 if (io_remap_pfn_range(area, area->vm_start,
3195 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3196 size, area->vm_page_prot))
3197 return -EAGAIN;
3198 return 0;
3199 }
3200
3201 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3202 #endif /* SNDRV_PCM_INFO_MMAP */
3203
3204 /*
3205 * mmap DMA buffer
3206 */
3207 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3208 struct vm_area_struct *area)
3209 {
3210 struct snd_pcm_runtime *runtime;
3211 long size;
3212 unsigned long offset;
3213 size_t dma_bytes;
3214 int err;
3215
3216 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3217 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3218 return -EINVAL;
3219 } else {
3220 if (!(area->vm_flags & VM_READ))
3221 return -EINVAL;
3222 }
3223 runtime = substream->runtime;
3224 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3225 return -EBADFD;
3226 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3227 return -ENXIO;
3228 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3229 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3230 return -EINVAL;
3231 size = area->vm_end - area->vm_start;
3232 offset = area->vm_pgoff << PAGE_SHIFT;
3233 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3234 if ((size_t)size > dma_bytes)
3235 return -EINVAL;
3236 if (offset > dma_bytes - size)
3237 return -EINVAL;
3238
3239 area->vm_ops = &snd_pcm_vm_ops_data;
3240 area->vm_private_data = substream;
3241 if (substream->ops->mmap)
3242 err = substream->ops->mmap(substream, area);
3243 else
3244 err = snd_pcm_default_mmap(substream, area);
3245 if (!err)
3246 atomic_inc(&substream->mmap_count);
3247 return err;
3248 }
3249
3250 EXPORT_SYMBOL(snd_pcm_mmap_data);
3251
3252 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3253 {
3254 struct snd_pcm_file * pcm_file;
3255 struct snd_pcm_substream *substream;
3256 unsigned long offset;
3257
3258 pcm_file = file->private_data;
3259 substream = pcm_file->substream;
3260 if (PCM_RUNTIME_CHECK(substream))
3261 return -ENXIO;
3262
3263 offset = area->vm_pgoff << PAGE_SHIFT;
3264 switch (offset) {
3265 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3266 if (pcm_file->no_compat_mmap)
3267 return -ENXIO;
3268 return snd_pcm_mmap_status(substream, file, area);
3269 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3270 if (pcm_file->no_compat_mmap)
3271 return -ENXIO;
3272 return snd_pcm_mmap_control(substream, file, area);
3273 default:
3274 return snd_pcm_mmap_data(substream, file, area);
3275 }
3276 return 0;
3277 }
3278
3279 static int snd_pcm_fasync(int fd, struct file * file, int on)
3280 {
3281 struct snd_pcm_file * pcm_file;
3282 struct snd_pcm_substream *substream;
3283 struct snd_pcm_runtime *runtime;
3284
3285 pcm_file = file->private_data;
3286 substream = pcm_file->substream;
3287 if (PCM_RUNTIME_CHECK(substream))
3288 return -ENXIO;
3289 runtime = substream->runtime;
3290 return fasync_helper(fd, file, on, &runtime->fasync);
3291 }
3292
3293 /*
3294 * ioctl32 compat
3295 */
3296 #ifdef CONFIG_COMPAT
3297 #include "pcm_compat.c"
3298 #else
3299 #define snd_pcm_ioctl_compat NULL
3300 #endif
3301
3302 /*
3303 * To be removed helpers to keep binary compatibility
3304 */
3305
3306 #ifdef CONFIG_SND_SUPPORT_OLD_API
3307 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3308 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3309
3310 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3311 struct snd_pcm_hw_params_old *oparams)
3312 {
3313 unsigned int i;
3314
3315 memset(params, 0, sizeof(*params));
3316 params->flags = oparams->flags;
3317 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3318 params->masks[i].bits[0] = oparams->masks[i];
3319 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3320 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3321 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3322 params->info = oparams->info;
3323 params->msbits = oparams->msbits;
3324 params->rate_num = oparams->rate_num;
3325 params->rate_den = oparams->rate_den;
3326 params->fifo_size = oparams->fifo_size;
3327 }
3328
3329 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3330 struct snd_pcm_hw_params *params)
3331 {
3332 unsigned int i;
3333
3334 memset(oparams, 0, sizeof(*oparams));
3335 oparams->flags = params->flags;
3336 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3337 oparams->masks[i] = params->masks[i].bits[0];
3338 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3339 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3340 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3341 oparams->info = params->info;
3342 oparams->msbits = params->msbits;
3343 oparams->rate_num = params->rate_num;
3344 oparams->rate_den = params->rate_den;
3345 oparams->fifo_size = params->fifo_size;
3346 }
3347
3348 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3349 struct snd_pcm_hw_params_old __user * _oparams)
3350 {
3351 struct snd_pcm_hw_params *params;
3352 struct snd_pcm_hw_params_old *oparams = NULL;
3353 int err;
3354
3355 params = kmalloc(sizeof(*params), GFP_KERNEL);
3356 if (!params)
3357 return -ENOMEM;
3358
3359 oparams = memdup_user(_oparams, sizeof(*oparams));
3360 if (IS_ERR(oparams)) {
3361 err = PTR_ERR(oparams);
3362 goto out;
3363 }
3364 snd_pcm_hw_convert_from_old_params(params, oparams);
3365 err = snd_pcm_hw_refine(substream, params);
3366 snd_pcm_hw_convert_to_old_params(oparams, params);
3367 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3368 if (!err)
3369 err = -EFAULT;
3370 }
3371
3372 kfree(oparams);
3373 out:
3374 kfree(params);
3375 return err;
3376 }
3377
3378 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3379 struct snd_pcm_hw_params_old __user * _oparams)
3380 {
3381 struct snd_pcm_hw_params *params;
3382 struct snd_pcm_hw_params_old *oparams = NULL;
3383 int err;
3384
3385 params = kmalloc(sizeof(*params), GFP_KERNEL);
3386 if (!params)
3387 return -ENOMEM;
3388
3389 oparams = memdup_user(_oparams, sizeof(*oparams));
3390 if (IS_ERR(oparams)) {
3391 err = PTR_ERR(oparams);
3392 goto out;
3393 }
3394 snd_pcm_hw_convert_from_old_params(params, oparams);
3395 err = snd_pcm_hw_params(substream, params);
3396 snd_pcm_hw_convert_to_old_params(oparams, params);
3397 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3398 if (!err)
3399 err = -EFAULT;
3400 }
3401
3402 kfree(oparams);
3403 out:
3404 kfree(params);
3405 return err;
3406 }
3407 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3408
3409 #ifndef CONFIG_MMU
3410 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3411 unsigned long addr,
3412 unsigned long len,
3413 unsigned long pgoff,
3414 unsigned long flags)
3415 {
3416 struct snd_pcm_file *pcm_file = file->private_data;
3417 struct snd_pcm_substream *substream = pcm_file->substream;
3418 struct snd_pcm_runtime *runtime = substream->runtime;
3419 unsigned long offset = pgoff << PAGE_SHIFT;
3420
3421 switch (offset) {
3422 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3423 return (unsigned long)runtime->status;
3424 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3425 return (unsigned long)runtime->control;
3426 default:
3427 return (unsigned long)runtime->dma_area + offset;
3428 }
3429 }
3430 #else
3431 # define snd_pcm_get_unmapped_area NULL
3432 #endif
3433
3434 /*
3435 * Register section
3436 */
3437
3438 const struct file_operations snd_pcm_f_ops[2] = {
3439 {
3440 .owner = THIS_MODULE,
3441 .write = snd_pcm_write,
3442 .aio_write = snd_pcm_aio_write,
3443 .open = snd_pcm_playback_open,
3444 .release = snd_pcm_release,
3445 .llseek = no_llseek,
3446 .poll = snd_pcm_playback_poll,
3447 .unlocked_ioctl = snd_pcm_playback_ioctl,
3448 .compat_ioctl = snd_pcm_ioctl_compat,
3449 .mmap = snd_pcm_mmap,
3450 .fasync = snd_pcm_fasync,
3451 .get_unmapped_area = snd_pcm_get_unmapped_area,
3452 },
3453 {
3454 .owner = THIS_MODULE,
3455 .read = snd_pcm_read,
3456 .aio_read = snd_pcm_aio_read,
3457 .open = snd_pcm_capture_open,
3458 .release = snd_pcm_release,
3459 .llseek = no_llseek,
3460 .poll = snd_pcm_capture_poll,
3461 .unlocked_ioctl = snd_pcm_capture_ioctl,
3462 .compat_ioctl = snd_pcm_ioctl_compat,
3463 .mmap = snd_pcm_mmap,
3464 .fasync = snd_pcm_fasync,
3465 .get_unmapped_area = snd_pcm_get_unmapped_area,
3466 }
3467 };
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree