Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[linux-stable.git] / sound / usb / line6 / pcm.c
blob6a4af725aedd2c33b0a44ade0a6df8b086e44678
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Line 6 Linux USB driver
5 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
6 */
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>
15 #include "capture.h"
16 #include "driver.h"
17 #include "playback.h"
19 /* impulse response volume controls */
20 static int snd_line6_impulse_volume_info(struct snd_kcontrol *kcontrol,
21 struct snd_ctl_elem_info *uinfo)
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;
30 static int snd_line6_impulse_volume_get(struct snd_kcontrol *kcontrol,
31 struct snd_ctl_elem_value *ucontrol)
33 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
35 ucontrol->value.integer.value[0] = line6pcm->impulse_volume;
36 return 0;
39 static int snd_line6_impulse_volume_put(struct snd_kcontrol *kcontrol,
40 struct snd_ctl_elem_value *ucontrol)
42 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
43 int value = ucontrol->value.integer.value[0];
44 int err;
46 if (line6pcm->impulse_volume == value)
47 return 0;
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;
56 } else {
57 line6_pcm_release(line6pcm, LINE6_STREAM_IMPULSE);
59 return 1;
62 /* impulse response period controls */
63 static int snd_line6_impulse_period_info(struct snd_kcontrol *kcontrol,
64 struct snd_ctl_elem_info *uinfo)
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;
73 static int snd_line6_impulse_period_get(struct snd_kcontrol *kcontrol,
74 struct snd_ctl_elem_value *ucontrol)
76 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
78 ucontrol->value.integer.value[0] = line6pcm->impulse_period;
79 return 0;
82 static int snd_line6_impulse_period_put(struct snd_kcontrol *kcontrol,
83 struct snd_ctl_elem_value *ucontrol)
85 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
86 int value = ucontrol->value.integer.value[0];
88 if (line6pcm->impulse_period == value)
89 return 0;
91 line6pcm->impulse_period = value;
92 return 1;
96 Unlink all currently active URBs.
98 static void line6_unlink_audio_urbs(struct snd_line6_pcm *line6pcm,
99 struct line6_pcm_stream *pcms)
101 int i;
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]);
112 Wait until unlinking of all currently active URBs has been finished.
114 static void line6_wait_clear_audio_urbs(struct snd_line6_pcm *line6pcm,
115 struct line6_pcm_stream *pcms)
117 int timeout = HZ;
118 int i;
119 int alive;
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++;
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);
137 static inline struct line6_pcm_stream *
138 get_stream(struct snd_line6_pcm *line6pcm, int direction)
140 return (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
141 &line6pcm->out : &line6pcm->in;
144 /* allocate a buffer if not opened yet;
145 * call this in line6pcm.state_mutex
147 static int line6_buffer_acquire(struct snd_line6_pcm *line6pcm,
148 struct line6_pcm_stream *pstr, int direction, int type)
150 const int pkt_size =
151 (direction == SNDRV_PCM_STREAM_PLAYBACK) ?
152 line6pcm->max_packet_size_out :
153 line6pcm->max_packet_size_in;
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;
164 return 0;
167 /* free a buffer if all streams are closed;
168 * call this in line6pcm.state_mutex
170 static void line6_buffer_release(struct snd_line6_pcm *line6pcm,
171 struct line6_pcm_stream *pstr, int type)
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;
181 /* start a PCM stream */
182 static int line6_stream_start(struct snd_line6_pcm *line6pcm, int direction,
183 int type)
185 unsigned long flags;
186 struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
187 int ret = 0;
189 spin_lock_irqsave(&pstr->lock, flags);
190 if (!test_and_set_bit(type, &pstr->running) &&
191 !(pstr->active_urbs || pstr->unlink_urbs)) {
192 pstr->count = 0;
193 /* Submit all currently available URBs */
194 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
195 ret = line6_submit_audio_out_all_urbs(line6pcm);
196 else
197 ret = line6_submit_audio_in_all_urbs(line6pcm);
200 if (ret < 0)
201 clear_bit(type, &pstr->running);
202 spin_unlock_irqrestore(&pstr->lock, flags);
203 return ret;
206 /* stop a PCM stream; this doesn't sync with the unlinked URBs */
207 static void line6_stream_stop(struct snd_line6_pcm *line6pcm, int direction,
208 int type)
210 unsigned long flags;
211 struct line6_pcm_stream *pstr = get_stream(line6pcm, direction);
213 spin_lock_irqsave(&pstr->lock, flags);
214 clear_bit(type, &pstr->running);
215 if (!pstr->running) {
216 spin_unlock_irqrestore(&pstr->lock, flags);
217 line6_unlink_audio_urbs(line6pcm, pstr);
218 spin_lock_irqsave(&pstr->lock, flags);
219 if (direction == SNDRV_PCM_STREAM_CAPTURE) {
220 line6pcm->prev_fbuf = NULL;
221 line6pcm->prev_fsize = 0;
224 spin_unlock_irqrestore(&pstr->lock, flags);
227 /* common PCM trigger callback */
228 int snd_line6_trigger(struct snd_pcm_substream *substream, int cmd)
230 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
231 struct snd_pcm_substream *s;
232 int err;
234 clear_bit(LINE6_FLAG_PREPARED, &line6pcm->flags);
236 snd_pcm_group_for_each_entry(s, substream) {
237 if (s->pcm->card != substream->pcm->card)
238 continue;
240 switch (cmd) {
241 case SNDRV_PCM_TRIGGER_START:
242 case SNDRV_PCM_TRIGGER_RESUME:
243 if (s->stream == SNDRV_PCM_STREAM_CAPTURE &&
244 (line6pcm->line6->properties->capabilities &
245 LINE6_CAP_IN_NEEDS_OUT)) {
246 err = line6_stream_start(line6pcm, SNDRV_PCM_STREAM_PLAYBACK,
247 LINE6_STREAM_CAPTURE_HELPER);
248 if (err < 0)
249 return err;
251 err = line6_stream_start(line6pcm, s->stream,
252 LINE6_STREAM_PCM);
253 if (err < 0)
254 return err;
255 break;
257 case SNDRV_PCM_TRIGGER_STOP:
258 case SNDRV_PCM_TRIGGER_SUSPEND:
259 if (s->stream == SNDRV_PCM_STREAM_CAPTURE &&
260 (line6pcm->line6->properties->capabilities &
261 LINE6_CAP_IN_NEEDS_OUT)) {
262 line6_stream_stop(line6pcm, SNDRV_PCM_STREAM_PLAYBACK,
263 LINE6_STREAM_CAPTURE_HELPER);
265 line6_stream_stop(line6pcm, s->stream,
266 LINE6_STREAM_PCM);
267 break;
269 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
270 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
271 return -EINVAL;
272 set_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
273 break;
275 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
276 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
277 return -EINVAL;
278 clear_bit(LINE6_FLAG_PAUSE_PLAYBACK, &line6pcm->flags);
279 break;
281 default:
282 return -EINVAL;
286 return 0;
289 /* common PCM pointer callback */
290 snd_pcm_uframes_t snd_line6_pointer(struct snd_pcm_substream *substream)
292 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
293 struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
295 return pstr->pos_done;
298 /* Acquire and optionally start duplex streams:
299 * type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
301 int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type, bool start)
303 struct line6_pcm_stream *pstr;
304 int ret = 0, dir;
306 /* TODO: We should assert SNDRV_PCM_STREAM_PLAYBACK/CAPTURE == 0/1 */
307 mutex_lock(&line6pcm->state_mutex);
308 for (dir = 0; dir < 2; dir++) {
309 pstr = get_stream(line6pcm, dir);
310 ret = line6_buffer_acquire(line6pcm, pstr, dir, type);
311 if (ret < 0)
312 goto error;
313 if (!pstr->running)
314 line6_wait_clear_audio_urbs(line6pcm, pstr);
316 if (start) {
317 for (dir = 0; dir < 2; dir++) {
318 ret = line6_stream_start(line6pcm, dir, type);
319 if (ret < 0)
320 goto error;
323 error:
324 mutex_unlock(&line6pcm->state_mutex);
325 if (ret < 0)
326 line6_pcm_release(line6pcm, type);
327 return ret;
329 EXPORT_SYMBOL_GPL(line6_pcm_acquire);
331 /* Stop and release duplex streams */
332 void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type)
334 struct line6_pcm_stream *pstr;
335 int dir;
337 mutex_lock(&line6pcm->state_mutex);
338 for (dir = 0; dir < 2; dir++)
339 line6_stream_stop(line6pcm, dir, type);
340 for (dir = 0; dir < 2; dir++) {
341 pstr = get_stream(line6pcm, dir);
342 line6_buffer_release(line6pcm, pstr, type);
344 mutex_unlock(&line6pcm->state_mutex);
346 EXPORT_SYMBOL_GPL(line6_pcm_release);
348 /* common PCM hw_params callback */
349 int snd_line6_hw_params(struct snd_pcm_substream *substream,
350 struct snd_pcm_hw_params *hw_params)
352 int ret;
353 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
354 struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
356 mutex_lock(&line6pcm->state_mutex);
357 ret = line6_buffer_acquire(line6pcm, pstr, substream->stream,
358 LINE6_STREAM_PCM);
359 if (ret < 0)
360 goto error;
362 pstr->period = params_period_bytes(hw_params);
363 error:
364 mutex_unlock(&line6pcm->state_mutex);
365 return ret;
368 /* common PCM hw_free callback */
369 int snd_line6_hw_free(struct snd_pcm_substream *substream)
371 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
372 struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
374 mutex_lock(&line6pcm->state_mutex);
375 line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
376 mutex_unlock(&line6pcm->state_mutex);
377 return 0;
381 /* control info callback */
382 static int snd_line6_control_playback_info(struct snd_kcontrol *kcontrol,
383 struct snd_ctl_elem_info *uinfo)
385 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
386 uinfo->count = 2;
387 uinfo->value.integer.min = 0;
388 uinfo->value.integer.max = 256;
389 return 0;
392 /* control get callback */
393 static int snd_line6_control_playback_get(struct snd_kcontrol *kcontrol,
394 struct snd_ctl_elem_value *ucontrol)
396 int i;
397 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
399 for (i = 0; i < 2; i++)
400 ucontrol->value.integer.value[i] = line6pcm->volume_playback[i];
402 return 0;
405 /* control put callback */
406 static int snd_line6_control_playback_put(struct snd_kcontrol *kcontrol,
407 struct snd_ctl_elem_value *ucontrol)
409 int i, changed = 0;
410 struct snd_line6_pcm *line6pcm = snd_kcontrol_chip(kcontrol);
412 for (i = 0; i < 2; i++)
413 if (line6pcm->volume_playback[i] !=
414 ucontrol->value.integer.value[i]) {
415 line6pcm->volume_playback[i] =
416 ucontrol->value.integer.value[i];
417 changed = 1;
420 return changed;
423 /* control definition */
424 static const struct snd_kcontrol_new line6_controls[] = {
426 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
427 .name = "PCM Playback Volume",
428 .info = snd_line6_control_playback_info,
429 .get = snd_line6_control_playback_get,
430 .put = snd_line6_control_playback_put
433 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
434 .name = "Impulse Response Volume",
435 .info = snd_line6_impulse_volume_info,
436 .get = snd_line6_impulse_volume_get,
437 .put = snd_line6_impulse_volume_put
440 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
441 .name = "Impulse Response Period",
442 .info = snd_line6_impulse_period_info,
443 .get = snd_line6_impulse_period_get,
444 .put = snd_line6_impulse_period_put
449 Cleanup the PCM device.
451 static void cleanup_urbs(struct line6_pcm_stream *pcms, int iso_buffers)
453 int i;
455 /* Most likely impossible in current code... */
456 if (pcms->urbs == NULL)
457 return;
459 for (i = 0; i < iso_buffers; i++) {
460 if (pcms->urbs[i]) {
461 usb_kill_urb(pcms->urbs[i]);
462 usb_free_urb(pcms->urbs[i]);
465 kfree(pcms->urbs);
466 pcms->urbs = NULL;
469 static void line6_cleanup_pcm(struct snd_pcm *pcm)
471 struct snd_line6_pcm *line6pcm = snd_pcm_chip(pcm);
473 cleanup_urbs(&line6pcm->out, line6pcm->line6->iso_buffers);
474 cleanup_urbs(&line6pcm->in, line6pcm->line6->iso_buffers);
475 kfree(line6pcm);
478 /* create a PCM device */
479 static int snd_line6_new_pcm(struct usb_line6 *line6, struct snd_pcm **pcm_ret)
481 struct snd_pcm *pcm;
482 int err;
484 err = snd_pcm_new(line6->card, (char *)line6->properties->name,
485 0, 1, 1, pcm_ret);
486 if (err < 0)
487 return err;
488 pcm = *pcm_ret;
489 strcpy(pcm->name, line6->properties->name);
491 /* set operators */
492 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
493 &snd_line6_playback_ops);
494 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_line6_capture_ops);
496 /* pre-allocation of buffers */
497 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
498 NULL, 64 * 1024, 128 * 1024);
499 return 0;
503 Sync with PCM stream stops.
505 void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
507 line6_unlink_audio_urbs(line6pcm, &line6pcm->out);
508 line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
509 line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
510 line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
514 Create and register the PCM device and mixer entries.
515 Create URBs for playback and capture.
517 int line6_init_pcm(struct usb_line6 *line6,
518 struct line6_pcm_properties *properties)
520 int i, err;
521 unsigned ep_read = line6->properties->ep_audio_r;
522 unsigned ep_write = line6->properties->ep_audio_w;
523 struct snd_pcm *pcm;
524 struct snd_line6_pcm *line6pcm;
526 if (!(line6->properties->capabilities & LINE6_CAP_PCM))
527 return 0; /* skip PCM initialization and report success */
529 err = snd_line6_new_pcm(line6, &pcm);
530 if (err < 0)
531 return err;
533 line6pcm = kzalloc(sizeof(*line6pcm), GFP_KERNEL);
534 if (!line6pcm)
535 return -ENOMEM;
537 mutex_init(&line6pcm->state_mutex);
538 line6pcm->pcm = pcm;
539 line6pcm->properties = properties;
540 line6pcm->volume_playback[0] = line6pcm->volume_playback[1] = 255;
541 line6pcm->volume_monitor = 255;
542 line6pcm->line6 = line6;
544 spin_lock_init(&line6pcm->out.lock);
545 spin_lock_init(&line6pcm->in.lock);
546 line6pcm->impulse_period = LINE6_IMPULSE_DEFAULT_PERIOD;
548 line6->line6pcm = line6pcm;
550 pcm->private_data = line6pcm;
551 pcm->private_free = line6_cleanup_pcm;
553 line6pcm->max_packet_size_in =
554 usb_maxpacket(line6->usbdev,
555 usb_rcvisocpipe(line6->usbdev, ep_read));
556 line6pcm->max_packet_size_out =
557 usb_maxpacket(line6->usbdev,
558 usb_sndisocpipe(line6->usbdev, ep_write));
559 if (!line6pcm->max_packet_size_in || !line6pcm->max_packet_size_out) {
560 dev_err(line6pcm->line6->ifcdev,
561 "cannot get proper max packet size\n");
562 return -EINVAL;
565 err = line6_create_audio_out_urbs(line6pcm);
566 if (err < 0)
567 return err;
569 err = line6_create_audio_in_urbs(line6pcm);
570 if (err < 0)
571 return err;
573 /* mixer: */
574 for (i = 0; i < ARRAY_SIZE(line6_controls); i++) {
575 err = snd_ctl_add(line6->card,
576 snd_ctl_new1(&line6_controls[i], line6pcm));
577 if (err < 0)
578 return err;
581 return 0;
583 EXPORT_SYMBOL_GPL(line6_init_pcm);
585 /* prepare pcm callback */
586 int snd_line6_prepare(struct snd_pcm_substream *substream)
588 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
589 struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);
591 mutex_lock(&line6pcm->state_mutex);
592 if (!pstr->running)
593 line6_wait_clear_audio_urbs(line6pcm, pstr);
595 if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) {
596 line6pcm->out.count = 0;
597 line6pcm->out.pos = 0;
598 line6pcm->out.pos_done = 0;
599 line6pcm->out.bytes = 0;
600 line6pcm->in.count = 0;
601 line6pcm->in.pos_done = 0;
602 line6pcm->in.bytes = 0;
605 mutex_unlock(&line6pcm->state_mutex);
606 return 0;