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Linux/sound/usb/line6/pcm.c

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  1 /*
  2  * Line 6 Linux USB driver
  3  *
  4  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
  5  *
  6  *      This program is free software; you can redistribute it and/or
  7  *      modify it under the terms of the GNU General Public License as
  8  *      published by the Free Software Foundation, version 2.
  9  *
 10  */
 11 
 12 #include <linux/slab.h>
 13 #include <linux/export.h>
 14 #include <sound/core.h>
 15 #include <sound/control.h>
 16 #include <sound/pcm.h>
 17 #include <sound/pcm_params.h>
 18 
 19 #include "capture.h"
 20 #include "driver.h"
 21 #include "playback.h"
 22 
 23 /* impulse response volume controls */
 24 static int snd_line6_impulse_volume_info(struct snd_kcontrol *kcontrol,
 25                                          struct snd_ctl_elem_info *uinfo)
 26 {
 27         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 28         uinfo->count = 1;
 29         uinfo->value.integer.min = 0;
 30         uinfo->value.integer.max = 255;
 31         return 0;
 32 }
 33 
 34 static int snd_line6_impulse_volume_get(struct snd_kcontrol *kcontrol,
 35                                         struct snd_ctl_elem_value *ucontrol)
 36 {
 37         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
 38 
 39         ucontrol->value.integer.value[0] = line6pcm->impulse_volume;
 40         return 0;
 41 }
 42 
 43 static int snd_line6_impulse_volume_put(struct snd_kcontrol *kcontrol,
 44                                         struct snd_ctl_elem_value *ucontrol)
 45 {
 46         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
 47         int value = ucontrol->value.integer.value[0];
 48         int err;
 49 
 50         if (line6pcm->impulse_volume == value)
 51                 return 0;
 52 
 53         line6pcm->impulse_volume = value;
 54         if (value > 0) {
 55                 err = line6_pcm_acquire(line6pcm, LINE6_STREAM_IMPULSE, true);
 56                 if (err < 0) {
 57                         line6pcm->impulse_volume = 0;
 58                         return err;
 59                 }
 60         } else {
 61                 line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE);
 62         }
 63         return 1;
 64 }
 65 
 66 /* impulse response period controls */
 67 static int snd_line6_impulse_period_info(struct snd_kcontrol *kcontrol,
 68                                          struct snd_ctl_elem_info *uinfo)
 69 {
 70         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 71         uinfo->count = 1;
 72         uinfo->value.integer.min = 0;
 73         uinfo->value.integer.max = 2000;
 74         return 0;
 75 }
 76 
 77 static int snd_line6_impulse_period_get(struct snd_kcontrol *kcontrol,
 78                                         struct snd_ctl_elem_value *ucontrol)
 79 {
 80         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
 81 
 82         ucontrol->value.integer.value[0] = line6pcm->impulse_period;
 83         return 0;
 84 }
 85 
 86 static int snd_line6_impulse_period_put(struct snd_kcontrol *kcontrol,
 87                                         struct snd_ctl_elem_value *ucontrol)
 88 {
 89         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
 90         int value = ucontrol->value.integer.value[0];
 91 
 92         if (line6pcm->impulse_period == value)
 93                 return 0;
 94 
 95         line6pcm->impulse_period = value;
 96         return 1;
 97 }
 98 
 99 /*
100         Unlink all currently active URBs.
101 */
102 static void line6_unlink_audio_urbs(struct snd_line6_pcm *line6pcm,
103                                     struct line6_pcm_stream *pcms)
104 {
105         int i;
106 
107         for (i = 0; i < line6pcm->line6->iso_buffers; i++) {
108                 if (test_bit(i, &pcms->active_urbs)) {
109                         if (!test_and_set_bit(i, &pcms->unlink_urbs))
110                                 usb_unlink_urb(pcms->urbs[i]);
111                 }
112         }
113 }
114 
115 /*
116         Wait until unlinking of all currently active URBs has been finished.
117 */
118 static void line6_wait_clear_audio_urbs(struct snd_line6_pcm *line6pcm,
119                                         struct line6_pcm_stream *pcms)
120 {
121         int timeout = HZ;
122         int i;
123         int alive;
124 
125         do {
126                 alive = 0;
127                 for (i = 0; i < line6pcm->line6->iso_buffers; i++) {
128                         if (test_bit(i, &pcms->active_urbs))
129                                 alive++;
130                 }
131                 if (!alive)
132                         break;
133                 set_current_state(TASK_UNINTERRUPTIBLE);
134                 schedule_timeout(1);
135         } while (--timeout > 0);
136         if (alive)
137                 dev_err(line6pcm->line6->ifcdev,
138                         "timeout: still %d active urbs..\n", alive);
139 }
140 
141 static inline struct line6_pcm_stream *
142 get_stream(struct snd_line6_pcm *line6pcm, int direction)
143 {
144         return (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
145                 &line6pcm->out : &line6pcm->in;
146 }
147 
148 /* allocate a buffer if not opened yet;
149  * call this in line6pcm.state_mutex
150  */
151 static int line6_buffer_acquire(struct snd_line6_pcm *line6pcm,
152                                 struct line6_pcm_stream *pstr, int direction, int type)
153 {
154         const int pkt_size =
155                 (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
156                         line6pcm->max_packet_size_out :
157                         line6pcm->max_packet_size_in;
158 
159         /* Invoked multiple times in a row so allocate once only */
160         if (!test_and_set_bit(type, &pstr->opened) && !pstr->buffer) {
161                 pstr->buffer = kmalloc(line6pcm->line6->iso_buffers *
162                                        LINE6_ISO_PACKETS * pkt_size, GFP_KERNEL);
163                 if (!pstr->buffer)
164                         return -ENOMEM;
165         }
166         return 0;
167 }
168 
169 /* free a buffer if all streams are closed;
170  * call this in line6pcm.state_mutex
171  */
172 static void line6_buffer_release(struct snd_line6_pcm *line6pcm,
173                                  struct line6_pcm_stream *pstr, int type)
174 {
175         clear_bit(type, &pstr->opened);
176         if (!pstr->opened) {
177                 line6_wait_clear_audio_urbs(line6pcm, pstr);
178                 kfree(pstr->buffer);
179                 pstr->buffer = NULL;
180         }
181 }
182 
183 /* start a PCM stream */
184 static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction,
185                               int type)
186 {
187         unsigned long flags;
188         struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
189         int ret = 0;
190 
191         spin_lock_irqsave(&pstr->lock, flags);
192         if (!test_and_set_bit(type, &pstr->running) &&
193             !(pstr->active_urbs || pstr->unlink_urbs)) {
194                 pstr->count = 0;
195                 /* Submit all currently available URBs */
196                 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
197                         ret = line6_submit_audio_out_all_urbs(line6pcm);
198                 else
199                         ret = line6_submit_audio_in_all_urbs(line6pcm);
200         }
201 
202         if (ret < 0)
203                 clear_bit(type, &pstr->running);
204         spin_unlock_irqrestore(&pstr->lock, flags);
205         return ret;
206 }
207 
208 /* stop a PCM stream; this doesn't sync with the unlinked URBs */
209 static void line6_stream_stop(struct snd_line6_pcm *line6pcm, int direction,
210                           int type)
211 {
212         unsigned long flags;
213         struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
214 
215         spin_lock_irqsave(&pstr->lock, flags);
216         clear_bit(type, &pstr->running);
217         if (!pstr->running) {
218                 spin_unlock_irqrestore(&pstr->lock, flags);
219                 line6_unlink_audio_urbs(line6pcm, pstr);
220                 spin_lock_irqsave(&pstr->lock, flags);
221                 if (direction == SNDRV_PCM_STREAM_CAPTURE) {
222                         line6pcm->prev_fbuf = NULL;
223                         line6pcm->prev_fsize = 0;
224                 }
225         }
226         spin_unlock_irqrestore(&pstr->lock, flags);
227 }
228 
229 /* common PCM trigger callback */
230 int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
231 {
232         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
233         struct snd_pcm_substream *s;
234         int err;
235 
236         clear_bit(LINE6_FLAG_PREPARED, &line6pcm->flags);
237 
238         snd_pcm_group_for_each_entry(s, substream) {
239                 if (s->pcm->card != substream->pcm->card)
240                         continue;
241 
242                 switch (cmd) {
243                 case SNDRV_PCM_TRIGGER_START:
244                 case SNDRV_PCM_TRIGGER_RESUME:
245                         if (s->stream == SNDRV_PCM_STREAM_CAPTURE &&
246                                 (line6pcm->line6->properties->capabilities &
247                                         LINE6_CAP_IN_NEEDS_OUT)) {
248                                 err = line6_stream_start(line6pcm, SNDRV_PCM_STREAM_PLAYBACK,
249                                                  LINE6_STREAM_CAPTURE_HELPER);
250                                 if (err < 0)
251                                         return err;
252                         }
253                         err = line6_stream_start(line6pcm, s->stream,
254                                                  LINE6_STREAM_PCM);
255                         if (err < 0)
256                                 return err;
257                         break;
258 
259                 case SNDRV_PCM_TRIGGER_STOP:
260                 case SNDRV_PCM_TRIGGER_SUSPEND:
261                         if (s->stream == SNDRV_PCM_STREAM_CAPTURE &&
262                                 (line6pcm->line6->properties->capabilities &
263                                         LINE6_CAP_IN_NEEDS_OUT)) {
264                                 line6_stream_stop(line6pcm, SNDRV_PCM_STREAM_PLAYBACK,
265                                           LINE6_STREAM_CAPTURE_HELPER);
266                         }
267                         line6_stream_stop(line6pcm, s->stream,
268                                           LINE6_STREAM_PCM);
269                         break;
270 
271                 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
272                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
273                                 return -EINVAL;
274                         set_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
275                         break;
276 
277                 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
278                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
279                                 return -EINVAL;
280                         clear_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
281                         break;
282 
283                 default:
284                         return -EINVAL;
285                 }
286         }
287 
288         return 0;
289 }
290 
291 /* common PCM pointer callback */
292 snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream)
293 {
294         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
295         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
296 
297         return pstr->pos_done;
298 }
299 
300 /* Acquire and optionally start duplex streams:
301  * type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
302  */
303 int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type, bool start)
304 {
305         struct line6_pcm_stream *pstr;
306         int ret = 0, dir;
307 
308         /* TODO: We should assert SNDRV_PCM_STREAM_PLAYBACK/CAPTURE == 0/1 */
309         mutex_lock(&line6pcm->state_mutex);
310         for (dir = 0; dir < 2; dir++) {
311                 pstr = get_stream(line6pcm, dir);
312                 ret = line6_buffer_acquire(line6pcm, pstr, dir, type);
313                 if (ret < 0)
314                         goto error;
315                 if (!pstr->running)
316                         line6_wait_clear_audio_urbs(line6pcm, pstr);
317         }
318         if (start) {
319                 for (dir = 0; dir < 2; dir++) {
320                         ret = line6_stream_start(line6pcm, dir, type);
321                         if (ret < 0)
322                                 goto error;
323                 }
324         }
325  error:
326         mutex_unlock(&line6pcm->state_mutex);
327         if (ret < 0)
328                 line6_pcm_release(line6pcm, type);
329         return ret;
330 }
331 EXPORT_SYMBOL_GPL(line6_pcm_acquire);
332 
333 /* Stop and release duplex streams */
334 void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type)
335 {
336         struct line6_pcm_stream *pstr;
337         int dir;
338 
339         mutex_lock(&line6pcm->state_mutex);
340         for (dir = 0; dir < 2; dir++)
341                 line6_stream_stop(line6pcm, dir, type);
342         for (dir = 0; dir < 2; dir++) {
343                 pstr = get_stream(line6pcm, dir);
344                 line6_buffer_release(line6pcm, pstr, type);
345         }
346         mutex_unlock(&line6pcm->state_mutex);
347 }
348 EXPORT_SYMBOL_GPL(line6_pcm_release);
349 
350 /* common PCM hw_params callback */
351 int snd_line6_hw_params(struct snd_pcm_substream *substream,
352                         struct snd_pcm_hw_params *hw_params)
353 {
354         int ret;
355         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
356         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
357 
358         mutex_lock(&line6pcm->state_mutex);
359         ret = line6_buffer_acquire(line6pcm, pstr, substream->stream,
360                                    LINE6_STREAM_PCM);
361         if (ret < 0)
362                 goto error;
363 
364         ret = snd_pcm_lib_malloc_pages(substream,
365                                        params_buffer_bytes(hw_params));
366         if (ret < 0) {
367                 line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
368                 goto error;
369         }
370 
371         pstr->period = params_period_bytes(hw_params);
372  error:
373         mutex_unlock(&line6pcm->state_mutex);
374         return ret;
375 }
376 
377 /* common PCM hw_free callback */
378 int snd_line6_hw_free(struct snd_pcm_substream *substream)
379 {
380         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
381         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
382 
383         mutex_lock(&line6pcm->state_mutex);
384         line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
385         mutex_unlock(&line6pcm->state_mutex);
386         return snd_pcm_lib_free_pages(substream);
387 }
388 
389 
390 /* control info callback */
391 static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol,
392                                            struct snd_ctl_elem_info *uinfo)
393 {
394         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
395         uinfo->count = 2;
396         uinfo->value.integer.min = 0;
397         uinfo->value.integer.max = 256;
398         return 0;
399 }
400 
401 /* control get callback */
402 static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol,
403                                           struct snd_ctl_elem_value *ucontrol)
404 {
405         int i;
406         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
407 
408         for (i = 0; i < 2; i++)
409                 ucontrol->value.integer.value[i] = line6pcm->volume_playback[i];
410 
411         return 0;
412 }
413 
414 /* control put callback */
415 static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol,
416                                           struct snd_ctl_elem_value *ucontrol)
417 {
418         int i, changed = 0;
419         struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
420 
421         for (i = 0; i < 2; i++)
422                 if (line6pcm->volume_playback[i] !=
423                     ucontrol->value.integer.value[i]) {
424                         line6pcm->volume_playback[i] =
425                             ucontrol->value.integer.value[i];
426                         changed = 1;
427                 }
428 
429         return changed;
430 }
431 
432 /* control definition */
433 static const struct snd_kcontrol_new line6_controls[] = {
434         {
435                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
436                 .name = "PCM Playback Volume",
437                 .info = snd_line6_control_playback_info,
438                 .get = snd_line6_control_playback_get,
439                 .put = snd_line6_control_playback_put
440         },
441         {
442                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
443                 .name = "Impulse Response Volume",
444                 .info = snd_line6_impulse_volume_info,
445                 .get = snd_line6_impulse_volume_get,
446                 .put = snd_line6_impulse_volume_put
447         },
448         {
449                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
450                 .name = "Impulse Response Period",
451                 .info = snd_line6_impulse_period_info,
452                 .get = snd_line6_impulse_period_get,
453                 .put = snd_line6_impulse_period_put
454         },
455 };
456 
457 /*
458         Cleanup the PCM device.
459 */
460 static void cleanup_urbs(struct line6_pcm_stream *pcms, int iso_buffers)
461 {
462         int i;
463 
464         /* Most likely impossible in current code... */
465         if (pcms->urbs == NULL)
466                 return;
467 
468         for (i = 0; i < iso_buffers; i++) {
469                 if (pcms->urbs[i]) {
470                         usb_kill_urb(pcms->urbs[i]);
471                         usb_free_urb(pcms->urbs[i]);
472                 }
473         }
474         kfree(pcms->urbs);
475         pcms->urbs = NULL;
476 }
477 
478 static void line6_cleanup_pcm(struct snd_pcm *pcm)
479 {
480         struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
481 
482         cleanup_urbs(&line6pcm->out, line6pcm->line6->iso_buffers);
483         cleanup_urbs(&line6pcm->in, line6pcm->line6->iso_buffers);
484         kfree(line6pcm);
485 }
486 
487 /* create a PCM device */
488 static int snd_line6_new_pcm(struct usb_line6 *line6, struct snd_pcm **pcm_ret)
489 {
490         struct snd_pcm *pcm;
491         int err;
492 
493         err = snd_pcm_new(line6->card, (char *)line6->properties->name,
494                           0, 1, 1, pcm_ret);
495         if (err < 0)
496                 return err;
497         pcm = *pcm_ret;
498         strcpy(pcm->name, line6->properties->name);
499 
500         /* set operators */
501         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
502                         &snd_line6_playback_ops);
503         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
504 
505         /* pre-allocation of buffers */
506         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
507                                               snd_dma_continuous_data
508                                               (GFP_KERNEL), 64 * 1024,
509                                               128 * 1024);
510         return 0;
511 }
512 
513 /*
514         Sync with PCM stream stops.
515 */
516 void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
517 {
518         line6_unlink_audio_urbs(line6pcm, &line6pcm->out);
519         line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
520         line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
521         line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
522 }
523 
524 /*
525         Create and register the PCM device and mixer entries.
526         Create URBs for playback and capture.
527 */
528 int line6_init_pcm(struct usb_line6 *line6,
529                    struct line6_pcm_properties *properties)
530 {
531         int i, err;
532         unsigned ep_read = line6->properties->ep_audio_r;
533         unsigned ep_write = line6->properties->ep_audio_w;
534         struct snd_pcm *pcm;
535         struct snd_line6_pcm *line6pcm;
536 
537         if (!(line6->properties->capabilities & LINE6_CAP_PCM))
538                 return 0;       /* skip PCM initialization and report success */
539 
540         err = snd_line6_new_pcm(line6, &pcm);
541         if (err < 0)
542                 return err;
543 
544         line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL);
545         if (!line6pcm)
546                 return -ENOMEM;
547 
548         mutex_init(&line6pcm->state_mutex);
549         line6pcm->pcm = pcm;
550         line6pcm->properties = properties;
551         line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
552         line6pcm->volume_monitor = 255;
553         line6pcm->line6 = line6;
554 
555         line6pcm->max_packet_size_in =
556                 usb_maxpacket(line6->usbdev,
557                         usb_rcvisocpipe(line6->usbdev, ep_read), 0);
558         line6pcm->max_packet_size_out =
559                 usb_maxpacket(line6->usbdev,
560                         usb_sndisocpipe(line6->usbdev, ep_write), 1);
561 
562         spin_lock_init(&line6pcm->out.lock);
563         spin_lock_init(&line6pcm->in.lock);
564         line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
565 
566         line6->line6pcm = line6pcm;
567 
568         pcm->private_data = line6pcm;
569         pcm->private_free = line6_cleanup_pcm;
570 
571         err = line6_create_audio_out_urbs(line6pcm);
572         if (err < 0)
573                 return err;
574 
575         err = line6_create_audio_in_urbs(line6pcm);
576         if (err < 0)
577                 return err;
578 
579         /* mixer: */
580         for (i = 0; i < ARRAY_SIZE(line6_controls); i++) {
581                 err = snd_ctl_add(line6->card,
582                                   snd_ctl_new1(&line6_controls[i], line6pcm));
583                 if (err < 0)
584                         return err;
585         }
586 
587         return 0;
588 }
589 EXPORT_SYMBOL_GPL(line6_init_pcm);
590 
591 /* prepare pcm callback */
592 int snd_line6_prepare(struct snd_pcm_substream *substream)
593 {
594         struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
595         struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
596 
597         mutex_lock(&line6pcm->state_mutex);
598         if (!pstr->running)
599                 line6_wait_clear_audio_urbs(line6pcm, pstr);
600 
601         if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) {
602                 line6pcm->out.count = 0;
603                 line6pcm->out.pos = 0;
604                 line6pcm->out.pos_done = 0;
605                 line6pcm->out.bytes = 0;
606                 line6pcm->in.count = 0;
607                 line6pcm->in.pos_done = 0;
608                 line6pcm->in.bytes = 0;
609         }
610 
611         mutex_unlock(&line6pcm->state_mutex);
612         return 0;
613 }
614 

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