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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 */
24static 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
34static 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
43static 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 */
67static 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
77static 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
86static 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*/
102static 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*/
118static 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
141static inline struct line6_pcm_stream *
142get_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 */
151static 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 */
172static 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 */
184static 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 */
209static 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 */
230int 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 */
292snd_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 */
303int 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}
331EXPORT_SYMBOL_GPL(line6_pcm_acquire);
332
333/* Stop and release duplex streams */
334void 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}
348EXPORT_SYMBOL_GPL(line6_pcm_release);
349
350/* common PCM hw_params callback */
351int 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 */
378int 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 */
391static 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 */
402static 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 */
415static 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 */
433static 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*/
460static 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
478static 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 */
488static 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*/
516void 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*/
528int 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}
589EXPORT_SYMBOL_GPL(line6_init_pcm);
590
591/* prepare pcm callback */
592int 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}