1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Line 6 Linux USB driver
4 *
5 * Copyright (C) 2004-2010 Markus Grabner (line6@grabner-graz.at)
6 */
7
8 #include <linux/slab.h>
9 #include <linux/export.h>
10 #include <sound/core.h>
11 #include <sound/control.h>
12 #include <sound/pcm.h>
13 #include <sound/pcm_params.h>
14
15 #include "capture.h"
16 #include "driver.h"
17 #include "playback.h"
18
19 /* impulse response volume controls */
snd_line6_impulse_volume_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)20 static int snd_line6_impulse_volume_info(struct snd_kcontrol *kcontrol,
21 struct snd_ctl_elem_info *uinfo)
22 {
23 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
24 uinfo->count = 1;
25 uinfo->value.integer.min = 0;
26 uinfo->value.integer.max = 255;
27 return 0;
28 }
29
snd_line6_impulse_volume_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)30 static int snd_line6_impulse_volume_get(struct snd_kcontrol *kcontrol,
31 struct snd_ctl_elem_value *ucontrol)
32 {
33 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
34
35 ucontrol->value.integer.value[0] = line6pcm->impulse_volume;
36 return 0;
37 }
38
snd_line6_impulse_volume_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)39 static int snd_line6_impulse_volume_put(struct snd_kcontrol *kcontrol,
40 struct snd_ctl_elem_value *ucontrol)
41 {
42 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
43 int value = ucontrol->value.integer.value[0];
44 int err;
45
46 if (line6pcm->impulse_volume == value)
47 return 0;
48
49 line6pcm->impulse_volume = value;
50 if (value > 0) {
51 err = line6_pcm_acquire(line6pcm, LINE6_STREAM_IMPULSE, true);
52 if (err < 0) {
53 line6pcm->impulse_volume = 0;
54 return err;
55 }
56 } else {
57 line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE);
58 }
59 return 1;
60 }
61
62 /* impulse response period controls */
snd_line6_impulse_period_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)63 static int snd_line6_impulse_period_info(struct snd_kcontrol *kcontrol,
64 struct snd_ctl_elem_info *uinfo)
65 {
66 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
67 uinfo->count = 1;
68 uinfo->value.integer.min = 0;
69 uinfo->value.integer.max = 2000;
70 return 0;
71 }
72
snd_line6_impulse_period_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)73 static int snd_line6_impulse_period_get(struct snd_kcontrol *kcontrol,
74 struct snd_ctl_elem_value *ucontrol)
75 {
76 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
77
78 ucontrol->value.integer.value[0] = line6pcm->impulse_period;
79 return 0;
80 }
81
snd_line6_impulse_period_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)82 static int snd_line6_impulse_period_put(struct snd_kcontrol *kcontrol,
83 struct snd_ctl_elem_value *ucontrol)
84 {
85 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
86 int value = ucontrol->value.integer.value[0];
87
88 if (line6pcm->impulse_period == value)
89 return 0;
90
91 line6pcm->impulse_period = value;
92 return 1;
93 }
94
95 /*
96 Unlink all currently active URBs.
97 */
line6_unlink_audio_urbs(struct snd_line6_pcm * line6pcm,struct line6_pcm_stream * pcms)98 static void line6_unlink_audio_urbs(struct snd_line6_pcm *line6pcm,
99 struct line6_pcm_stream *pcms)
100 {
101 int i;
102
103 for (i = 0; i < line6pcm->line6->iso_buffers; i++) {
104 if (test_bit(i, &pcms->active_urbs)) {
105 if (!test_and_set_bit(i, &pcms->unlink_urbs))
106 usb_unlink_urb(pcms->urbs[i]);
107 }
108 }
109 }
110
111 /*
112 Wait until unlinking of all currently active URBs has been finished.
113 */
line6_wait_clear_audio_urbs(struct snd_line6_pcm * line6pcm,struct line6_pcm_stream * pcms)114 static void line6_wait_clear_audio_urbs(struct snd_line6_pcm *line6pcm,
115 struct line6_pcm_stream *pcms)
116 {
117 int timeout = HZ;
118 int i;
119 int alive;
120
121 do {
122 alive = 0;
123 for (i = 0; i < line6pcm->line6->iso_buffers; i++) {
124 if (test_bit(i, &pcms->active_urbs))
125 alive++;
126 }
127 if (!alive)
128 break;
129 set_current_state(TASK_UNINTERRUPTIBLE);
130 schedule_timeout(1);
131 } while (--timeout > 0);
132 if (alive)
133 dev_err(line6pcm->line6->ifcdev,
134 "timeout: still %d active urbs..\n", alive);
135 }
136
137 static inline struct line6_pcm_stream *
get_stream(struct snd_line6_pcm * line6pcm,int direction)138 get_stream(struct snd_line6_pcm *line6pcm, int direction)
139 {
140 return (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
141 &line6pcm->out : &line6pcm->in;
142 }
143
144 /* allocate a buffer if not opened yet;
145 * call this in line6pcm.state_mutex
146 */
line6_buffer_acquire(struct snd_line6_pcm * line6pcm,struct line6_pcm_stream * pstr,int direction,int type)147 static int line6_buffer_acquire(struct snd_line6_pcm *line6pcm,
148 struct line6_pcm_stream *pstr, int direction, int type)
149 {
150 const int pkt_size =
151 (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
152 line6pcm->max_packet_size_out :
153 line6pcm->max_packet_size_in;
154
155 /* Invoked multiple times in a row so allocate once only */
156 if (!test_and_set_bit(type, &pstr->opened) && !pstr->buffer) {
157 pstr->buffer =
158 kmalloc(array3_size(line6pcm->line6->iso_buffers,
159 LINE6_ISO_PACKETS, pkt_size),
160 GFP_KERNEL);
161 if (!pstr->buffer)
162 return -ENOMEM;
163 }
164 return 0;
165 }
166
167 /* free a buffer if all streams are closed;
168 * call this in line6pcm.state_mutex
169 */
line6_buffer_release(struct snd_line6_pcm * line6pcm,struct line6_pcm_stream * pstr,int type)170 static void line6_buffer_release(struct snd_line6_pcm *line6pcm,
171 struct line6_pcm_stream *pstr, int type)
172 {
173 clear_bit(type, &pstr->opened);
174 if (!pstr->opened) {
175 line6_wait_clear_audio_urbs(line6pcm, pstr);
176 kfree(pstr->buffer);
177 pstr->buffer = NULL;
178 }
179 }
180
181 /* start a PCM stream */
line6_stream_start(struct snd_line6_pcm * line6pcm,int direction,int type)182 static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction,
183 int type)
184 {
185 struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
186 int ret = 0;
187
188 guard(spinlock_irqsave)(&pstr->lock);
189 if (!test_and_set_bit(type, &pstr->running) &&
190 !(pstr->active_urbs || pstr->unlink_urbs)) {
191 pstr->count = 0;
192 /* Submit all currently available URBs */
193 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
194 ret = line6_submit_audio_out_all_urbs(line6pcm);
195 else
196 ret = line6_submit_audio_in_all_urbs(line6pcm);
197 }
198
199 if (ret < 0)
200 clear_bit(type, &pstr->running);
201 return ret;
202 }
203
204 /* stop a PCM stream; this doesn't sync with the unlinked URBs */
line6_stream_stop(struct snd_line6_pcm * line6pcm,int direction,int type)205 static void line6_stream_stop(struct snd_line6_pcm *line6pcm, int direction,
206 int type)
207 {
208 struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
209
210 scoped_guard(spinlock_irqsave, &pstr->lock) {
211 clear_bit(type, &pstr->running);
212 if (pstr->running)
213 return;
214 }
215
216 line6_unlink_audio_urbs(line6pcm, pstr);
217 if (direction == SNDRV_PCM_STREAM_CAPTURE) {
218 guard(spinlock_irqsave)(&pstr->lock);
219 line6pcm->prev_fbuf = NULL;
220 line6pcm->prev_fsize = 0;
221 }
222 }
223
224 /* common PCM trigger callback */
snd_line6_trigger(struct snd_pcm_substream * substream,int cmd)225 int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
226 {
227 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
228 struct snd_pcm_substream *s;
229 int err;
230
231 clear_bit(LINE6_FLAG_PREPARED, &line6pcm->flags);
232
233 snd_pcm_group_for_each_entry(s, substream) {
234 if (s->pcm->card != substream->pcm->card)
235 continue;
236
237 switch (cmd) {
238 case SNDRV_PCM_TRIGGER_START:
239 case SNDRV_PCM_TRIGGER_RESUME:
240 if (s->stream == SNDRV_PCM_STREAM_CAPTURE &&
241 (line6pcm->line6->properties->capabilities &
242 LINE6_CAP_IN_NEEDS_OUT)) {
243 err = line6_stream_start(line6pcm, SNDRV_PCM_STREAM_PLAYBACK,
244 LINE6_STREAM_CAPTURE_HELPER);
245 if (err < 0)
246 return err;
247 }
248 err = line6_stream_start(line6pcm, s->stream,
249 LINE6_STREAM_PCM);
250 if (err < 0)
251 return err;
252 break;
253
254 case SNDRV_PCM_TRIGGER_STOP:
255 case SNDRV_PCM_TRIGGER_SUSPEND:
256 if (s->stream == SNDRV_PCM_STREAM_CAPTURE &&
257 (line6pcm->line6->properties->capabilities &
258 LINE6_CAP_IN_NEEDS_OUT)) {
259 line6_stream_stop(line6pcm, SNDRV_PCM_STREAM_PLAYBACK,
260 LINE6_STREAM_CAPTURE_HELPER);
261 }
262 line6_stream_stop(line6pcm, s->stream,
263 LINE6_STREAM_PCM);
264 break;
265
266 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
267 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
268 return -EINVAL;
269 set_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
270 break;
271
272 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
273 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
274 return -EINVAL;
275 clear_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
276 break;
277
278 default:
279 return -EINVAL;
280 }
281 }
282
283 return 0;
284 }
285
286 /* common PCM pointer callback */
snd_line6_pointer(struct snd_pcm_substream * substream)287 snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream)
288 {
289 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
290 struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
291
292 return pstr->pos_done;
293 }
294
295 /* Stop and release duplex streams */
__line6_pcm_release(struct snd_line6_pcm * line6pcm,int type)296 static void __line6_pcm_release(struct snd_line6_pcm *line6pcm, int type)
297 {
298 struct line6_pcm_stream *pstr;
299 int dir;
300
301 for (dir = 0; dir < 2; dir++)
302 line6_stream_stop(line6pcm, dir, type);
303 for (dir = 0; dir < 2; dir++) {
304 pstr = get_stream(line6pcm, dir);
305 line6_buffer_release(line6pcm, pstr, type);
306 }
307 }
308
309 /* Stop and release duplex streams */
line6_pcm_release(struct snd_line6_pcm * line6pcm,int type)310 void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type)
311 {
312 guard(mutex)(&line6pcm->state_mutex);
313 __line6_pcm_release(line6pcm, type);
314 }
315 EXPORT_SYMBOL_GPL(line6_pcm_release);
316
317 /* Acquire and optionally start duplex streams:
318 * type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
319 */
line6_pcm_acquire(struct snd_line6_pcm * line6pcm,int type,bool start)320 int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type, bool start)
321 {
322 struct line6_pcm_stream *pstr;
323 int ret = 0, dir;
324
325 /* TODO: We should assert SNDRV_PCM_STREAM_PLAYBACK/CAPTURE == 0/1 */
326 guard(mutex)(&line6pcm->state_mutex);
327 for (dir = 0; dir < 2; dir++) {
328 pstr = get_stream(line6pcm, dir);
329 ret = line6_buffer_acquire(line6pcm, pstr, dir, type);
330 if (ret < 0)
331 goto error;
332 if (!pstr->running)
333 line6_wait_clear_audio_urbs(line6pcm, pstr);
334 }
335 if (start) {
336 for (dir = 0; dir < 2; dir++) {
337 ret = line6_stream_start(line6pcm, dir, type);
338 if (ret < 0)
339 goto error;
340 }
341 }
342 error:
343 if (ret < 0)
344 __line6_pcm_release(line6pcm, type);
345 return ret;
346 }
347 EXPORT_SYMBOL_GPL(line6_pcm_acquire);
348
349 /* common PCM hw_params callback */
snd_line6_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)350 int snd_line6_hw_params(struct snd_pcm_substream *substream,
351 struct snd_pcm_hw_params *hw_params)
352 {
353 int ret;
354 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
355 struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
356
357 guard(mutex)(&line6pcm->state_mutex);
358 ret = line6_buffer_acquire(line6pcm, pstr, substream->stream,
359 LINE6_STREAM_PCM);
360 if (ret < 0)
361 return ret;
362
363 pstr->period = params_period_bytes(hw_params);
364 return 0;
365 }
366
367 /* common PCM hw_free callback */
snd_line6_hw_free(struct snd_pcm_substream * substream)368 int snd_line6_hw_free(struct snd_pcm_substream *substream)
369 {
370 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
371 struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
372
373 guard(mutex)(&line6pcm->state_mutex);
374 line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
375 return 0;
376 }
377
378
379 /* control info callback */
snd_line6_control_playback_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)380 static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol,
381 struct snd_ctl_elem_info *uinfo)
382 {
383 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
384 uinfo->count = 2;
385 uinfo->value.integer.min = 0;
386 uinfo->value.integer.max = 256;
387 return 0;
388 }
389
390 /* control get callback */
snd_line6_control_playback_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)391 static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol,
392 struct snd_ctl_elem_value *ucontrol)
393 {
394 int i;
395 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
396
397 for (i = 0; i < 2; i++)
398 ucontrol->value.integer.value[i] = line6pcm->volume_playback[i];
399
400 return 0;
401 }
402
403 /* control put callback */
snd_line6_control_playback_put(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)404 static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol,
405 struct snd_ctl_elem_value *ucontrol)
406 {
407 int i, changed = 0;
408 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
409
410 for (i = 0; i < 2; i++)
411 if (line6pcm->volume_playback[i] !=
412 ucontrol->value.integer.value[i]) {
413 line6pcm->volume_playback[i] =
414 ucontrol->value.integer.value[i];
415 changed = 1;
416 }
417
418 return changed;
419 }
420
421 /* control definition */
422 static const struct snd_kcontrol_new line6_controls[] = {
423 {
424 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
425 .name = "PCM Playback Volume",
426 .info = snd_line6_control_playback_info,
427 .get = snd_line6_control_playback_get,
428 .put = snd_line6_control_playback_put
429 },
430 {
431 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
432 .name = "Impulse Response Volume",
433 .info = snd_line6_impulse_volume_info,
434 .get = snd_line6_impulse_volume_get,
435 .put = snd_line6_impulse_volume_put
436 },
437 {
438 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
439 .name = "Impulse Response Period",
440 .info = snd_line6_impulse_period_info,
441 .get = snd_line6_impulse_period_get,
442 .put = snd_line6_impulse_period_put
443 },
444 };
445
446 /*
447 Cleanup the PCM device.
448 */
cleanup_urbs(struct line6_pcm_stream * pcms,int iso_buffers)449 static void cleanup_urbs(struct line6_pcm_stream *pcms, int iso_buffers)
450 {
451 int i;
452
453 /* Most likely impossible in current code... */
454 if (pcms->urbs == NULL)
455 return;
456
457 for (i = 0; i < iso_buffers; i++) {
458 if (pcms->urbs[i]) {
459 usb_kill_urb(pcms->urbs[i]);
460 usb_free_urb(pcms->urbs[i]);
461 }
462 }
463 kfree(pcms->urbs);
464 pcms->urbs = NULL;
465 }
466
line6_cleanup_pcm(struct snd_pcm * pcm)467 static void line6_cleanup_pcm(struct snd_pcm *pcm)
468 {
469 struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
470
471 cleanup_urbs(&line6pcm->out, line6pcm->line6->iso_buffers);
472 cleanup_urbs(&line6pcm->in, line6pcm->line6->iso_buffers);
473 kfree(line6pcm);
474 }
475
476 /* create a PCM device */
snd_line6_new_pcm(struct usb_line6 * line6,struct snd_pcm ** pcm_ret)477 static int snd_line6_new_pcm(struct usb_line6 *line6, struct snd_pcm **pcm_ret)
478 {
479 struct snd_pcm *pcm;
480 int err;
481
482 err = snd_pcm_new(line6->card, (char *)line6->properties->name,
483 0, 1, 1, pcm_ret);
484 if (err < 0)
485 return err;
486 pcm = *pcm_ret;
487 strscpy(pcm->name, line6->properties->name);
488
489 /* set operators */
490 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
491 &snd_line6_playback_ops);
492 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
493
494 /* pre-allocation of buffers */
495 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
496 NULL, 64 * 1024, 128 * 1024);
497 return 0;
498 }
499
500 /*
501 Sync with PCM stream stops.
502 */
line6_pcm_disconnect(struct snd_line6_pcm * line6pcm)503 void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
504 {
505 line6_unlink_audio_urbs(line6pcm, &line6pcm->out);
506 line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
507 line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
508 line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
509 }
510
511 /*
512 Create and register the PCM device and mixer entries.
513 Create URBs for playback and capture.
514 */
line6_init_pcm(struct usb_line6 * line6,struct line6_pcm_properties * properties)515 int line6_init_pcm(struct usb_line6 *line6,
516 struct line6_pcm_properties *properties)
517 {
518 int i, err;
519 unsigned ep_read = line6->properties->ep_audio_r;
520 unsigned ep_write = line6->properties->ep_audio_w;
521 struct snd_pcm *pcm;
522 struct snd_line6_pcm *line6pcm;
523
524 if (!(line6->properties->capabilities & LINE6_CAP_PCM))
525 return 0; /* skip PCM initialization and report success */
526
527 err = snd_line6_new_pcm(line6, &pcm);
528 if (err < 0)
529 return err;
530
531 line6pcm = kzalloc_obj(*line6pcm);
532 if (!line6pcm)
533 return -ENOMEM;
534
535 mutex_init(&line6pcm->state_mutex);
536 line6pcm->pcm = pcm;
537 line6pcm->properties = properties;
538 line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
539 line6pcm->volume_monitor = 255;
540 line6pcm->line6 = line6;
541
542 spin_lock_init(&line6pcm->out.lock);
543 spin_lock_init(&line6pcm->in.lock);
544 line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
545
546 line6->line6pcm = line6pcm;
547
548 pcm->private_data = line6pcm;
549 pcm->private_free = line6_cleanup_pcm;
550
551 line6pcm->max_packet_size_in =
552 usb_maxpacket(line6->usbdev,
553 usb_rcvisocpipe(line6->usbdev, ep_read));
554 line6pcm->max_packet_size_out =
555 usb_maxpacket(line6->usbdev,
556 usb_sndisocpipe(line6->usbdev, ep_write));
557 if (!line6pcm->max_packet_size_in || !line6pcm->max_packet_size_out) {
558 dev_err(line6pcm->line6->ifcdev,
559 "cannot get proper max packet size\n");
560 return -EINVAL;
561 }
562
563 err = line6_create_audio_out_urbs(line6pcm);
564 if (err < 0)
565 return err;
566
567 err = line6_create_audio_in_urbs(line6pcm);
568 if (err < 0)
569 return err;
570
571 /* mixer: */
572 for (i = 0; i < ARRAY_SIZE(line6_controls); i++) {
573 err = snd_ctl_add(line6->card,
574 snd_ctl_new1(&line6_controls[i], line6pcm));
575 if (err < 0)
576 return err;
577 }
578
579 return 0;
580 }
581 EXPORT_SYMBOL_GPL(line6_init_pcm);
582
583 /* prepare pcm callback */
snd_line6_prepare(struct snd_pcm_substream * substream)584 int snd_line6_prepare(struct snd_pcm_substream *substream)
585 {
586 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
587 struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
588
589 guard(mutex)(&line6pcm->state_mutex);
590 if (!pstr->running)
591 line6_wait_clear_audio_urbs(line6pcm, pstr);
592
593 if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) {
594 line6pcm->out.count = 0;
595 line6pcm->out.pos = 0;
596 line6pcm->out.pos_done = 0;
597 line6pcm->out.bytes = 0;
598 line6pcm->in.count = 0;
599 line6pcm->in.pos_done = 0;
600 line6pcm->in.bytes = 0;
601 }
602
603 return 0;
604 }
605