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Merge tag 'v4.9-rc5' into patchwork
[mirror_ubuntu-artful-kernel.git] / drivers / media / usb / em28xx / em28xx-audio.c
1 /*
2 * Empiatech em28x1 audio extension
3 *
4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
5 *
6 * Copyright (C) 2007-2016 Mauro Carvalho Chehab
7 * - Port to work with the in-kernel driver
8 * - Cleanups, fixes, alsa-controls, etc.
9 *
10 * This driver is based on my previous au600 usb pstn audio driver
11 * and inherits all the copyrights
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28 #include "em28xx.h"
29
30 #include <linux/kernel.h>
31 #include <linux/usb.h>
32 #include <linux/init.h>
33 #include <linux/sound.h>
34 #include <linux/spinlock.h>
35 #include <linux/soundcard.h>
36 #include <linux/slab.h>
37 #include <linux/vmalloc.h>
38 #include <linux/proc_fs.h>
39 #include <linux/module.h>
40 #include <sound/core.h>
41 #include <sound/pcm.h>
42 #include <sound/pcm_params.h>
43 #include <sound/info.h>
44 #include <sound/initval.h>
45 #include <sound/control.h>
46 #include <sound/tlv.h>
47 #include <sound/ac97_codec.h>
48 #include <media/v4l2-common.h>
49
50 static int debug;
51 module_param(debug, int, 0644);
52 MODULE_PARM_DESC(debug, "activates debug info");
53
54 #define EM28XX_MAX_AUDIO_BUFS 5
55 #define EM28XX_MIN_AUDIO_PACKETS 64
56
57 #define dprintk(fmt, arg...) do { \
58 if (debug) \
59 printk(KERN_DEBUG pr_fmt("audio: %s: " fmt), \
60 __func__, ##arg); } while (0)
61
62 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
63
64 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
65 {
66 int i;
67
68 dprintk("Stopping isoc\n");
69 for (i = 0; i < dev->adev.num_urb; i++) {
70 struct urb *urb = dev->adev.urb[i];
71
72 if (!irqs_disabled())
73 usb_kill_urb(urb);
74 else
75 usb_unlink_urb(urb);
76 }
77
78 return 0;
79 }
80
81 static void em28xx_audio_isocirq(struct urb *urb)
82 {
83 struct em28xx *dev = urb->context;
84 int i;
85 unsigned int oldptr;
86 int period_elapsed = 0;
87 int status;
88 unsigned char *cp;
89 unsigned int stride;
90 struct snd_pcm_substream *substream;
91 struct snd_pcm_runtime *runtime;
92
93 if (dev->disconnected) {
94 dprintk("device disconnected while streaming. URB status=%d.\n", urb->status);
95 atomic_set(&dev->adev.stream_started, 0);
96 return;
97 }
98
99 switch (urb->status) {
100 case 0: /* success */
101 case -ETIMEDOUT: /* NAK */
102 break;
103 case -ECONNRESET: /* kill */
104 case -ENOENT:
105 case -ESHUTDOWN:
106 return;
107 default: /* error */
108 dprintk("urb completition error %d.\n", urb->status);
109 break;
110 }
111
112 if (atomic_read(&dev->adev.stream_started) == 0)
113 return;
114
115 if (dev->adev.capture_pcm_substream) {
116 substream = dev->adev.capture_pcm_substream;
117 runtime = substream->runtime;
118 stride = runtime->frame_bits >> 3;
119
120 for (i = 0; i < urb->number_of_packets; i++) {
121 int length =
122 urb->iso_frame_desc[i].actual_length / stride;
123 cp = (unsigned char *)urb->transfer_buffer +
124 urb->iso_frame_desc[i].offset;
125
126 if (!length)
127 continue;
128
129 oldptr = dev->adev.hwptr_done_capture;
130 if (oldptr + length >= runtime->buffer_size) {
131 unsigned int cnt =
132 runtime->buffer_size - oldptr;
133 memcpy(runtime->dma_area + oldptr * stride, cp,
134 cnt * stride);
135 memcpy(runtime->dma_area, cp + cnt * stride,
136 length * stride - cnt * stride);
137 } else {
138 memcpy(runtime->dma_area + oldptr * stride, cp,
139 length * stride);
140 }
141
142 snd_pcm_stream_lock(substream);
143
144 dev->adev.hwptr_done_capture += length;
145 if (dev->adev.hwptr_done_capture >=
146 runtime->buffer_size)
147 dev->adev.hwptr_done_capture -=
148 runtime->buffer_size;
149
150 dev->adev.capture_transfer_done += length;
151 if (dev->adev.capture_transfer_done >=
152 runtime->period_size) {
153 dev->adev.capture_transfer_done -=
154 runtime->period_size;
155 period_elapsed = 1;
156 }
157
158 snd_pcm_stream_unlock(substream);
159 }
160 if (period_elapsed)
161 snd_pcm_period_elapsed(substream);
162 }
163 urb->status = 0;
164
165 status = usb_submit_urb(urb, GFP_ATOMIC);
166 if (status < 0)
167 pr_err("resubmit of audio urb failed (error=%i)\n",
168 status);
169 return;
170 }
171
172 static int em28xx_init_audio_isoc(struct em28xx *dev)
173 {
174 int i, errCode;
175
176 dprintk("Starting isoc transfers\n");
177
178 /* Start streaming */
179 for (i = 0; i < dev->adev.num_urb; i++) {
180 memset(dev->adev.transfer_buffer[i], 0x80,
181 dev->adev.urb[i]->transfer_buffer_length);
182
183 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
184 if (errCode) {
185 pr_err("submit of audio urb failed (error=%i)\n",
186 errCode);
187 em28xx_deinit_isoc_audio(dev);
188 atomic_set(&dev->adev.stream_started, 0);
189 return errCode;
190 }
191
192 }
193
194 return 0;
195 }
196
197 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
198 size_t size)
199 {
200 struct snd_pcm_runtime *runtime = subs->runtime;
201
202 dprintk("Allocating vbuffer\n");
203 if (runtime->dma_area) {
204 if (runtime->dma_bytes > size)
205 return 0;
206
207 vfree(runtime->dma_area);
208 }
209 runtime->dma_area = vmalloc(size);
210 if (!runtime->dma_area)
211 return -ENOMEM;
212
213 runtime->dma_bytes = size;
214
215 return 0;
216 }
217
218 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
219 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
220 SNDRV_PCM_INFO_MMAP |
221 SNDRV_PCM_INFO_INTERLEAVED |
222 SNDRV_PCM_INFO_BATCH |
223 SNDRV_PCM_INFO_MMAP_VALID,
224
225 .formats = SNDRV_PCM_FMTBIT_S16_LE,
226
227 .rates = SNDRV_PCM_RATE_48000,
228
229 .rate_min = 48000,
230 .rate_max = 48000,
231 .channels_min = 2,
232 .channels_max = 2,
233 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
234
235 /*
236 * The period is 12.288 bytes. Allow a 10% of variation along its
237 * value, in order to avoid overruns/underruns due to some clock
238 * drift.
239 *
240 * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
241 * Calculate it dynamically.
242 */
243 .period_bytes_min = 11059,
244 .period_bytes_max = 13516,
245
246 .periods_min = 2,
247 .periods_max = 98, /* 12544, */
248 };
249
250 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
251 {
252 struct em28xx *dev = snd_pcm_substream_chip(substream);
253 struct snd_pcm_runtime *runtime = substream->runtime;
254 int nonblock, ret = 0;
255
256 if (!dev) {
257 pr_err("BUG: em28xx can't find device struct. Can't proceed with open\n");
258 return -ENODEV;
259 }
260
261 if (dev->disconnected)
262 return -ENODEV;
263
264 dprintk("opening device and trying to acquire exclusive lock\n");
265
266 nonblock = !!(substream->f_flags & O_NONBLOCK);
267 if (nonblock) {
268 if (!mutex_trylock(&dev->lock))
269 return -EAGAIN;
270 } else
271 mutex_lock(&dev->lock);
272
273 runtime->hw = snd_em28xx_hw_capture;
274
275 if (dev->adev.users == 0) {
276 if (dev->alt == 0 || dev->is_audio_only) {
277 if (dev->is_audio_only)
278 /* audio is on a separate interface */
279 dev->alt = 1;
280 else
281 /* audio is on the same interface as video */
282 dev->alt = 7;
283 /*
284 * FIXME: The intention seems to be to select
285 * the alt setting with the largest
286 * wMaxPacketSize for the video endpoint.
287 * At least dev->alt should be used instead, but
288 * we should probably not touch it at all if it
289 * is already >0, because wMaxPacketSize of the
290 * audio endpoints seems to be the same for all.
291 */
292 dprintk("changing alternate number on interface %d to %d\n",
293 dev->ifnum, dev->alt);
294 usb_set_interface(dev->udev, dev->ifnum, dev->alt);
295 }
296
297 /* Sets volume, mute, etc */
298 dev->mute = 0;
299 ret = em28xx_audio_analog_set(dev);
300 if (ret < 0)
301 goto err;
302 }
303
304 kref_get(&dev->ref);
305 dev->adev.users++;
306 mutex_unlock(&dev->lock);
307
308 /* Dynamically adjust the period size */
309 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
310 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
311 dev->adev.period * 95 / 100,
312 dev->adev.period * 105 / 100);
313
314 dev->adev.capture_pcm_substream = substream;
315
316 return 0;
317 err:
318 mutex_unlock(&dev->lock);
319
320 pr_err("Error while configuring em28xx mixer\n");
321 return ret;
322 }
323
324 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
325 {
326 struct em28xx *dev = snd_pcm_substream_chip(substream);
327
328 dprintk("closing device\n");
329
330 dev->mute = 1;
331 mutex_lock(&dev->lock);
332 dev->adev.users--;
333 if (atomic_read(&dev->adev.stream_started) > 0) {
334 atomic_set(&dev->adev.stream_started, 0);
335 schedule_work(&dev->adev.wq_trigger);
336 }
337
338 em28xx_audio_analog_set(dev);
339 if (substream->runtime->dma_area) {
340 dprintk("freeing\n");
341 vfree(substream->runtime->dma_area);
342 substream->runtime->dma_area = NULL;
343 }
344 mutex_unlock(&dev->lock);
345 kref_put(&dev->ref, em28xx_free_device);
346
347 return 0;
348 }
349
350 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
351 struct snd_pcm_hw_params *hw_params)
352 {
353 int ret;
354 struct em28xx *dev = snd_pcm_substream_chip(substream);
355
356 if (dev->disconnected)
357 return -ENODEV;
358
359 dprintk("Setting capture parameters\n");
360
361 ret = snd_pcm_alloc_vmalloc_buffer(substream,
362 params_buffer_bytes(hw_params));
363 if (ret < 0)
364 return ret;
365 #if 0
366 /* TODO: set up em28xx audio chip to deliver the correct audio format,
367 current default is 48000hz multiplexed => 96000hz mono
368 which shouldn't matter since analogue TV only supports mono */
369 unsigned int channels, rate, format;
370
371 format = params_format(hw_params);
372 rate = params_rate(hw_params);
373 channels = params_channels(hw_params);
374 #endif
375
376 return 0;
377 }
378
379 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
380 {
381 struct em28xx *dev = snd_pcm_substream_chip(substream);
382 struct em28xx_audio *adev = &dev->adev;
383
384 dprintk("Stop capture, if needed\n");
385
386 if (atomic_read(&adev->stream_started) > 0) {
387 atomic_set(&adev->stream_started, 0);
388 schedule_work(&adev->wq_trigger);
389 }
390
391 return 0;
392 }
393
394 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
395 {
396 struct em28xx *dev = snd_pcm_substream_chip(substream);
397
398 if (dev->disconnected)
399 return -ENODEV;
400
401 dev->adev.hwptr_done_capture = 0;
402 dev->adev.capture_transfer_done = 0;
403
404 return 0;
405 }
406
407 static void audio_trigger(struct work_struct *work)
408 {
409 struct em28xx_audio *adev =
410 container_of(work, struct em28xx_audio, wq_trigger);
411 struct em28xx *dev = container_of(adev, struct em28xx, adev);
412
413 if (atomic_read(&adev->stream_started)) {
414 dprintk("starting capture");
415 em28xx_init_audio_isoc(dev);
416 } else {
417 dprintk("stopping capture");
418 em28xx_deinit_isoc_audio(dev);
419 }
420 }
421
422 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
423 int cmd)
424 {
425 struct em28xx *dev = snd_pcm_substream_chip(substream);
426 int retval = 0;
427
428 if (dev->disconnected)
429 return -ENODEV;
430
431 switch (cmd) {
432 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
433 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
434 case SNDRV_PCM_TRIGGER_START:
435 atomic_set(&dev->adev.stream_started, 1);
436 break;
437 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
438 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
439 case SNDRV_PCM_TRIGGER_STOP:
440 atomic_set(&dev->adev.stream_started, 0);
441 break;
442 default:
443 retval = -EINVAL;
444 }
445 schedule_work(&dev->adev.wq_trigger);
446 return retval;
447 }
448
449 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
450 *substream)
451 {
452 unsigned long flags;
453 struct em28xx *dev;
454 snd_pcm_uframes_t hwptr_done;
455
456 dev = snd_pcm_substream_chip(substream);
457 if (dev->disconnected)
458 return SNDRV_PCM_POS_XRUN;
459
460 spin_lock_irqsave(&dev->adev.slock, flags);
461 hwptr_done = dev->adev.hwptr_done_capture;
462 spin_unlock_irqrestore(&dev->adev.slock, flags);
463
464 return hwptr_done;
465 }
466
467 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
468 unsigned long offset)
469 {
470 void *pageptr = subs->runtime->dma_area + offset;
471
472 return vmalloc_to_page(pageptr);
473 }
474
475 /*
476 * AC97 volume control support
477 */
478 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
479 struct snd_ctl_elem_info *info)
480 {
481 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
482
483 if (dev->disconnected)
484 return -ENODEV;
485
486 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
487 info->count = 2;
488 info->value.integer.min = 0;
489 info->value.integer.max = 0x1f;
490
491 return 0;
492 }
493
494 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
495 struct snd_ctl_elem_value *value)
496 {
497 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
498 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
499 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
500 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
501 int nonblock = 0;
502 int rc;
503
504 if (dev->disconnected)
505 return -ENODEV;
506
507 if (substream)
508 nonblock = !!(substream->f_flags & O_NONBLOCK);
509 if (nonblock) {
510 if (!mutex_trylock(&dev->lock))
511 return -EAGAIN;
512 } else
513 mutex_lock(&dev->lock);
514 rc = em28xx_read_ac97(dev, kcontrol->private_value);
515 if (rc < 0)
516 goto err;
517
518 val |= rc & 0x8000; /* Preserve the mute flag */
519
520 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
521 if (rc < 0)
522 goto err;
523
524 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
525 (val & 0x8000) ? "muted " : "",
526 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
527 val, (int)kcontrol->private_value);
528
529 err:
530 mutex_unlock(&dev->lock);
531 return rc;
532 }
533
534 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
535 struct snd_ctl_elem_value *value)
536 {
537 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
538 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
539 int nonblock = 0;
540 int val;
541
542 if (dev->disconnected)
543 return -ENODEV;
544
545 if (substream)
546 nonblock = !!(substream->f_flags & O_NONBLOCK);
547 if (nonblock) {
548 if (!mutex_trylock(&dev->lock))
549 return -EAGAIN;
550 } else
551 mutex_lock(&dev->lock);
552 val = em28xx_read_ac97(dev, kcontrol->private_value);
553 mutex_unlock(&dev->lock);
554 if (val < 0)
555 return val;
556
557 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
558 (val & 0x8000) ? "muted " : "",
559 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
560 val, (int)kcontrol->private_value);
561
562 value->value.integer.value[0] = 0x1f - (val & 0x1f);
563 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
564
565 return 0;
566 }
567
568 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
569 struct snd_ctl_elem_value *value)
570 {
571 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
572 u16 val = value->value.integer.value[0];
573 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
574 int nonblock = 0;
575 int rc;
576
577 if (dev->disconnected)
578 return -ENODEV;
579
580 if (substream)
581 nonblock = !!(substream->f_flags & O_NONBLOCK);
582 if (nonblock) {
583 if (!mutex_trylock(&dev->lock))
584 return -EAGAIN;
585 } else
586 mutex_lock(&dev->lock);
587 rc = em28xx_read_ac97(dev, kcontrol->private_value);
588 if (rc < 0)
589 goto err;
590
591 if (val)
592 rc &= 0x1f1f;
593 else
594 rc |= 0x8000;
595
596 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
597 if (rc < 0)
598 goto err;
599
600 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
601 (val & 0x8000) ? "muted " : "",
602 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
603 val, (int)kcontrol->private_value);
604
605 err:
606 mutex_unlock(&dev->lock);
607 return rc;
608 }
609
610 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
611 struct snd_ctl_elem_value *value)
612 {
613 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
614 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
615 int nonblock = 0;
616 int val;
617
618 if (dev->disconnected)
619 return -ENODEV;
620
621 if (substream)
622 nonblock = !!(substream->f_flags & O_NONBLOCK);
623 if (nonblock) {
624 if (!mutex_trylock(&dev->lock))
625 return -EAGAIN;
626 } else
627 mutex_lock(&dev->lock);
628 val = em28xx_read_ac97(dev, kcontrol->private_value);
629 mutex_unlock(&dev->lock);
630 if (val < 0)
631 return val;
632
633 if (val & 0x8000)
634 value->value.integer.value[0] = 0;
635 else
636 value->value.integer.value[0] = 1;
637
638 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
639 (val & 0x8000) ? "muted " : "",
640 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
641 val, (int)kcontrol->private_value);
642
643 return 0;
644 }
645
646 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
647
648 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
649 char *name, int id)
650 {
651 int err;
652 char ctl_name[44];
653 struct snd_kcontrol *kctl;
654 struct snd_kcontrol_new tmp;
655
656 memset(&tmp, 0, sizeof(tmp));
657 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
658 tmp.private_value = id,
659 tmp.name = ctl_name,
660
661 /* Add Mute Control */
662 sprintf(ctl_name, "%s Switch", name);
663 tmp.get = em28xx_vol_get_mute;
664 tmp.put = em28xx_vol_put_mute;
665 tmp.info = snd_ctl_boolean_mono_info;
666 kctl = snd_ctl_new1(&tmp, dev);
667 err = snd_ctl_add(card, kctl);
668 if (err < 0)
669 return err;
670 dprintk("Added control %s for ac97 volume control 0x%04x\n",
671 ctl_name, id);
672
673 memset(&tmp, 0, sizeof(tmp));
674 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
675 tmp.private_value = id,
676 tmp.name = ctl_name,
677
678 /* Add Volume Control */
679 sprintf(ctl_name, "%s Volume", name);
680 tmp.get = em28xx_vol_get;
681 tmp.put = em28xx_vol_put;
682 tmp.info = em28xx_vol_info;
683 tmp.tlv.p = em28xx_db_scale,
684 kctl = snd_ctl_new1(&tmp, dev);
685 err = snd_ctl_add(card, kctl);
686 if (err < 0)
687 return err;
688 dprintk("Added control %s for ac97 volume control 0x%04x\n",
689 ctl_name, id);
690
691 return 0;
692 }
693
694 /*
695 * register/unregister code and data
696 */
697 static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
698 .open = snd_em28xx_capture_open,
699 .close = snd_em28xx_pcm_close,
700 .ioctl = snd_pcm_lib_ioctl,
701 .hw_params = snd_em28xx_hw_capture_params,
702 .hw_free = snd_em28xx_hw_capture_free,
703 .prepare = snd_em28xx_prepare,
704 .trigger = snd_em28xx_capture_trigger,
705 .pointer = snd_em28xx_capture_pointer,
706 .page = snd_pcm_get_vmalloc_page,
707 };
708
709 static void em28xx_audio_free_urb(struct em28xx *dev)
710 {
711 int i;
712
713 for (i = 0; i < dev->adev.num_urb; i++) {
714 struct urb *urb = dev->adev.urb[i];
715
716 if (!urb)
717 continue;
718
719 usb_free_coherent(dev->udev, urb->transfer_buffer_length,
720 dev->adev.transfer_buffer[i],
721 urb->transfer_dma);
722
723 usb_free_urb(urb);
724 }
725 kfree(dev->adev.urb);
726 kfree(dev->adev.transfer_buffer);
727 dev->adev.num_urb = 0;
728 }
729
730 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
731 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
732 struct usb_endpoint_descriptor *e)
733 {
734 int size = le16_to_cpu(e->wMaxPacketSize);
735
736 if (udev->speed == USB_SPEED_HIGH)
737 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
738
739 return size & 0x7ff;
740 }
741
742 static int em28xx_audio_urb_init(struct em28xx *dev)
743 {
744 struct usb_interface *intf;
745 struct usb_endpoint_descriptor *e, *ep = NULL;
746 int i, ep_size, interval, num_urb, npackets;
747 int urb_size, bytes_per_transfer;
748 u8 alt;
749
750 if (dev->ifnum)
751 alt = 1;
752 else
753 alt = 7;
754
755 intf = usb_ifnum_to_if(dev->udev, dev->ifnum);
756
757 if (intf->num_altsetting <= alt) {
758 pr_err("alt %d doesn't exist on interface %d\n",
759 dev->ifnum, alt);
760 return -ENODEV;
761 }
762
763 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
764 e = &intf->altsetting[alt].endpoint[i].desc;
765 if (!usb_endpoint_dir_in(e))
766 continue;
767 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
768 ep = e;
769 break;
770 }
771 }
772
773 if (!ep) {
774 pr_err("Couldn't find an audio endpoint");
775 return -ENODEV;
776 }
777
778 ep_size = em28xx_audio_ep_packet_size(dev->udev, ep);
779 interval = 1 << (ep->bInterval - 1);
780
781 pr_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
782 EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed),
783 dev->ifnum, alt,
784 interval,
785 ep_size);
786
787 /* Calculate the number and size of URBs to better fit the audio samples */
788
789 /*
790 * Estimate the number of bytes per DMA transfer.
791 *
792 * This is given by the bit rate (for now, only 48000 Hz) multiplied
793 * by 2 channels and 2 bytes/sample divided by the number of microframe
794 * intervals and by the microframe rate (125 us)
795 */
796 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
797
798 /*
799 * Estimate the number of transfer URBs. Don't let it go past the
800 * maximum number of URBs that is known to be supported by the device.
801 */
802 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
803 if (num_urb > EM28XX_MAX_AUDIO_BUFS)
804 num_urb = EM28XX_MAX_AUDIO_BUFS;
805
806 /*
807 * Now that we know the number of bytes per transfer and the number of
808 * URBs, estimate the typical size of an URB, in order to adjust the
809 * minimal number of packets.
810 */
811 urb_size = bytes_per_transfer / num_urb;
812
813 /*
814 * Now, calculate the amount of audio packets to be filled on each
815 * URB. In order to preserve the old behaviour, use a minimal
816 * threshold for this value.
817 */
818 npackets = EM28XX_MIN_AUDIO_PACKETS;
819 if (urb_size > ep_size * npackets)
820 npackets = DIV_ROUND_UP(urb_size, ep_size);
821
822 pr_info("Number of URBs: %d, with %d packets and %d size\n",
823 num_urb, npackets, urb_size);
824
825 /* Estimate the bytes per period */
826 dev->adev.period = urb_size * npackets;
827
828 /* Allocate space to store the number of URBs to be used */
829
830 dev->adev.transfer_buffer = kcalloc(num_urb,
831 sizeof(*dev->adev.transfer_buffer),
832 GFP_ATOMIC);
833 if (!dev->adev.transfer_buffer) {
834 return -ENOMEM;
835 }
836
837 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
838 if (!dev->adev.urb) {
839 kfree(dev->adev.transfer_buffer);
840 return -ENOMEM;
841 }
842
843 /* Alloc memory for each URB and for each transfer buffer */
844 dev->adev.num_urb = num_urb;
845 for (i = 0; i < num_urb; i++) {
846 struct urb *urb;
847 int j, k;
848 void *buf;
849
850 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
851 if (!urb) {
852 em28xx_audio_free_urb(dev);
853 return -ENOMEM;
854 }
855 dev->adev.urb[i] = urb;
856
857 buf = usb_alloc_coherent(dev->udev, npackets * ep_size, GFP_ATOMIC,
858 &urb->transfer_dma);
859 if (!buf) {
860 pr_err("usb_alloc_coherent failed!\n");
861 em28xx_audio_free_urb(dev);
862 return -ENOMEM;
863 }
864 dev->adev.transfer_buffer[i] = buf;
865
866 urb->dev = dev->udev;
867 urb->context = dev;
868 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO);
869 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
870 urb->transfer_buffer = buf;
871 urb->interval = interval;
872 urb->complete = em28xx_audio_isocirq;
873 urb->number_of_packets = npackets;
874 urb->transfer_buffer_length = ep_size * npackets;
875
876 for (j = k = 0; j < npackets; j++, k += ep_size) {
877 urb->iso_frame_desc[j].offset = k;
878 urb->iso_frame_desc[j].length = ep_size;
879 }
880 }
881
882 return 0;
883 }
884
885 static int em28xx_audio_init(struct em28xx *dev)
886 {
887 struct em28xx_audio *adev = &dev->adev;
888 struct snd_pcm *pcm;
889 struct snd_card *card;
890 static int devnr;
891 int err;
892
893 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
894 /* This device does not support the extension (in this case
895 the device is expecting the snd-usb-audio module or
896 doesn't have analog audio support at all) */
897 return 0;
898 }
899
900 pr_info("Binding audio extension\n");
901
902 kref_get(&dev->ref);
903
904 pr_info("em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
905 pr_info("em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
906
907 err = snd_card_new(&dev->udev->dev, index[devnr], "Em28xx Audio",
908 THIS_MODULE, 0, &card);
909 if (err < 0)
910 return err;
911
912 spin_lock_init(&adev->slock);
913 adev->sndcard = card;
914 adev->udev = dev->udev;
915
916 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
917 if (err < 0)
918 goto card_free;
919
920 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
921 pcm->info_flags = 0;
922 pcm->private_data = dev;
923 strcpy(pcm->name, "Empia 28xx Capture");
924
925 strcpy(card->driver, "Em28xx-Audio");
926 strcpy(card->shortname, "Em28xx Audio");
927 strcpy(card->longname, "Empia Em28xx Audio");
928
929 INIT_WORK(&adev->wq_trigger, audio_trigger);
930
931 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
932 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
933 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
934 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
935 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
936 em28xx_cvol_new(card, dev, "CD", AC97_CD);
937 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
938 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
939
940 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
941 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
942 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
943 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
944 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
945 }
946
947 err = em28xx_audio_urb_init(dev);
948 if (err)
949 goto card_free;
950
951 err = snd_card_register(card);
952 if (err < 0)
953 goto urb_free;
954
955 pr_info("Audio extension successfully initialized\n");
956 return 0;
957
958 urb_free:
959 em28xx_audio_free_urb(dev);
960
961 card_free:
962 snd_card_free(card);
963 adev->sndcard = NULL;
964
965 return err;
966 }
967
968 static int em28xx_audio_fini(struct em28xx *dev)
969 {
970 if (dev == NULL)
971 return 0;
972
973 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
974 /* This device does not support the extension (in this case
975 the device is expecting the snd-usb-audio module or
976 doesn't have analog audio support at all) */
977 return 0;
978 }
979
980 pr_info("Closing audio extension\n");
981
982 if (dev->adev.sndcard) {
983 snd_card_disconnect(dev->adev.sndcard);
984 flush_work(&dev->adev.wq_trigger);
985
986 em28xx_audio_free_urb(dev);
987
988 snd_card_free(dev->adev.sndcard);
989 dev->adev.sndcard = NULL;
990 }
991
992 kref_put(&dev->ref, em28xx_free_device);
993 return 0;
994 }
995
996 static int em28xx_audio_suspend(struct em28xx *dev)
997 {
998 if (dev == NULL)
999 return 0;
1000
1001 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1002 return 0;
1003
1004 pr_info("Suspending audio extension\n");
1005 em28xx_deinit_isoc_audio(dev);
1006 atomic_set(&dev->adev.stream_started, 0);
1007 return 0;
1008 }
1009
1010 static int em28xx_audio_resume(struct em28xx *dev)
1011 {
1012 if (dev == NULL)
1013 return 0;
1014
1015 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1016 return 0;
1017
1018 pr_info("Resuming audio extension\n");
1019 /* Nothing to do other than schedule_work() ?? */
1020 schedule_work(&dev->adev.wq_trigger);
1021 return 0;
1022 }
1023
1024 static struct em28xx_ops audio_ops = {
1025 .id = EM28XX_AUDIO,
1026 .name = "Em28xx Audio Extension",
1027 .init = em28xx_audio_init,
1028 .fini = em28xx_audio_fini,
1029 .suspend = em28xx_audio_suspend,
1030 .resume = em28xx_audio_resume,
1031 };
1032
1033 static int __init em28xx_alsa_register(void)
1034 {
1035 return em28xx_register_extension(&audio_ops);
1036 }
1037
1038 static void __exit em28xx_alsa_unregister(void)
1039 {
1040 em28xx_unregister_extension(&audio_ops);
1041 }
1042
1043 MODULE_LICENSE("GPL");
1044 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1045 MODULE_AUTHOR("Mauro Carvalho Chehab");
1046 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1047 MODULE_VERSION(EM28XX_VERSION);
1048
1049 module_init(em28xx_alsa_register);
1050 module_exit(em28xx_alsa_unregister);
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