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Merge tag 'xtensa-20161219' of git://github.com/jcmvbkbc/linux-xtensa
[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 dev_printk(KERN_DEBUG, &dev->intf->dev, \
60 "video: %s: " fmt, __func__, ## arg); \
61 } while (0)
62
63 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
64
65 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
66 {
67 int i;
68
69 dprintk("Stopping isoc\n");
70 for (i = 0; i < dev->adev.num_urb; i++) {
71 struct urb *urb = dev->adev.urb[i];
72
73 if (!irqs_disabled())
74 usb_kill_urb(urb);
75 else
76 usb_unlink_urb(urb);
77 }
78
79 return 0;
80 }
81
82 static void em28xx_audio_isocirq(struct urb *urb)
83 {
84 struct em28xx *dev = urb->context;
85 int i;
86 unsigned int oldptr;
87 int period_elapsed = 0;
88 int status;
89 unsigned char *cp;
90 unsigned int stride;
91 struct snd_pcm_substream *substream;
92 struct snd_pcm_runtime *runtime;
93
94 if (dev->disconnected) {
95 dprintk("device disconnected while streaming. URB status=%d.\n",
96 urb->status);
97 atomic_set(&dev->adev.stream_started, 0);
98 return;
99 }
100
101 switch (urb->status) {
102 case 0: /* success */
103 case -ETIMEDOUT: /* NAK */
104 break;
105 case -ECONNRESET: /* kill */
106 case -ENOENT:
107 case -ESHUTDOWN:
108 return;
109 default: /* error */
110 dprintk("urb completition error %d.\n", urb->status);
111 break;
112 }
113
114 if (atomic_read(&dev->adev.stream_started) == 0)
115 return;
116
117 if (dev->adev.capture_pcm_substream) {
118 substream = dev->adev.capture_pcm_substream;
119 runtime = substream->runtime;
120 stride = runtime->frame_bits >> 3;
121
122 for (i = 0; i < urb->number_of_packets; i++) {
123 int length =
124 urb->iso_frame_desc[i].actual_length / stride;
125 cp = (unsigned char *)urb->transfer_buffer +
126 urb->iso_frame_desc[i].offset;
127
128 if (!length)
129 continue;
130
131 oldptr = dev->adev.hwptr_done_capture;
132 if (oldptr + length >= runtime->buffer_size) {
133 unsigned int cnt =
134 runtime->buffer_size - oldptr;
135 memcpy(runtime->dma_area + oldptr * stride, cp,
136 cnt * stride);
137 memcpy(runtime->dma_area, cp + cnt * stride,
138 length * stride - cnt * stride);
139 } else {
140 memcpy(runtime->dma_area + oldptr * stride, cp,
141 length * stride);
142 }
143
144 snd_pcm_stream_lock(substream);
145
146 dev->adev.hwptr_done_capture += length;
147 if (dev->adev.hwptr_done_capture >=
148 runtime->buffer_size)
149 dev->adev.hwptr_done_capture -=
150 runtime->buffer_size;
151
152 dev->adev.capture_transfer_done += length;
153 if (dev->adev.capture_transfer_done >=
154 runtime->period_size) {
155 dev->adev.capture_transfer_done -=
156 runtime->period_size;
157 period_elapsed = 1;
158 }
159
160 snd_pcm_stream_unlock(substream);
161 }
162 if (period_elapsed)
163 snd_pcm_period_elapsed(substream);
164 }
165 urb->status = 0;
166
167 status = usb_submit_urb(urb, GFP_ATOMIC);
168 if (status < 0)
169 dev_err(&dev->intf->dev,
170 "resubmit of audio urb failed (error=%i)\n",
171 status);
172 return;
173 }
174
175 static int em28xx_init_audio_isoc(struct em28xx *dev)
176 {
177 int i, errCode;
178
179 dprintk("Starting isoc transfers\n");
180
181 /* Start streaming */
182 for (i = 0; i < dev->adev.num_urb; i++) {
183 memset(dev->adev.transfer_buffer[i], 0x80,
184 dev->adev.urb[i]->transfer_buffer_length);
185
186 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
187 if (errCode) {
188 dev_err(&dev->intf->dev,
189 "submit of audio urb failed (error=%i)\n",
190 errCode);
191 em28xx_deinit_isoc_audio(dev);
192 atomic_set(&dev->adev.stream_started, 0);
193 return errCode;
194 }
195
196 }
197
198 return 0;
199 }
200
201 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
202 size_t size)
203 {
204 struct em28xx *dev = snd_pcm_substream_chip(subs);
205 struct snd_pcm_runtime *runtime = subs->runtime;
206
207 dprintk("Allocating vbuffer\n");
208 if (runtime->dma_area) {
209 if (runtime->dma_bytes > size)
210 return 0;
211
212 vfree(runtime->dma_area);
213 }
214 runtime->dma_area = vmalloc(size);
215 if (!runtime->dma_area)
216 return -ENOMEM;
217
218 runtime->dma_bytes = size;
219
220 return 0;
221 }
222
223 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
224 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
225 SNDRV_PCM_INFO_MMAP |
226 SNDRV_PCM_INFO_INTERLEAVED |
227 SNDRV_PCM_INFO_BATCH |
228 SNDRV_PCM_INFO_MMAP_VALID,
229
230 .formats = SNDRV_PCM_FMTBIT_S16_LE,
231
232 .rates = SNDRV_PCM_RATE_48000,
233
234 .rate_min = 48000,
235 .rate_max = 48000,
236 .channels_min = 2,
237 .channels_max = 2,
238 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
239
240 /*
241 * The period is 12.288 bytes. Allow a 10% of variation along its
242 * value, in order to avoid overruns/underruns due to some clock
243 * drift.
244 *
245 * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
246 * Calculate it dynamically.
247 */
248 .period_bytes_min = 11059,
249 .period_bytes_max = 13516,
250
251 .periods_min = 2,
252 .periods_max = 98, /* 12544, */
253 };
254
255 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
256 {
257 struct em28xx *dev = snd_pcm_substream_chip(substream);
258 struct snd_pcm_runtime *runtime = substream->runtime;
259 int nonblock, ret = 0;
260
261 if (!dev) {
262 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
263 return -ENODEV;
264 }
265
266 if (dev->disconnected)
267 return -ENODEV;
268
269 dprintk("opening device and trying to acquire exclusive lock\n");
270
271 nonblock = !!(substream->f_flags & O_NONBLOCK);
272 if (nonblock) {
273 if (!mutex_trylock(&dev->lock))
274 return -EAGAIN;
275 } else
276 mutex_lock(&dev->lock);
277
278 runtime->hw = snd_em28xx_hw_capture;
279
280 if (dev->adev.users == 0) {
281 if (dev->alt == 0 || dev->is_audio_only) {
282 struct usb_device *udev = interface_to_usbdev(dev->intf);
283
284 if (dev->is_audio_only)
285 /* audio is on a separate interface */
286 dev->alt = 1;
287 else
288 /* audio is on the same interface as video */
289 dev->alt = 7;
290 /*
291 * FIXME: The intention seems to be to select
292 * the alt setting with the largest
293 * wMaxPacketSize for the video endpoint.
294 * At least dev->alt should be used instead, but
295 * we should probably not touch it at all if it
296 * is already >0, because wMaxPacketSize of the
297 * audio endpoints seems to be the same for all.
298 */
299 dprintk("changing alternate number on interface %d to %d\n",
300 dev->ifnum, dev->alt);
301 usb_set_interface(udev, dev->ifnum, dev->alt);
302 }
303
304 /* Sets volume, mute, etc */
305 dev->mute = 0;
306 ret = em28xx_audio_analog_set(dev);
307 if (ret < 0)
308 goto err;
309 }
310
311 kref_get(&dev->ref);
312 dev->adev.users++;
313 mutex_unlock(&dev->lock);
314
315 /* Dynamically adjust the period size */
316 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
317 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
318 dev->adev.period * 95 / 100,
319 dev->adev.period * 105 / 100);
320
321 dev->adev.capture_pcm_substream = substream;
322
323 return 0;
324 err:
325 mutex_unlock(&dev->lock);
326
327 dev_err(&dev->intf->dev,
328 "Error while configuring em28xx mixer\n");
329 return ret;
330 }
331
332 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
333 {
334 struct em28xx *dev = snd_pcm_substream_chip(substream);
335
336 dprintk("closing device\n");
337
338 dev->mute = 1;
339 mutex_lock(&dev->lock);
340 dev->adev.users--;
341 if (atomic_read(&dev->adev.stream_started) > 0) {
342 atomic_set(&dev->adev.stream_started, 0);
343 schedule_work(&dev->adev.wq_trigger);
344 }
345
346 em28xx_audio_analog_set(dev);
347 if (substream->runtime->dma_area) {
348 dprintk("freeing\n");
349 vfree(substream->runtime->dma_area);
350 substream->runtime->dma_area = NULL;
351 }
352 mutex_unlock(&dev->lock);
353 kref_put(&dev->ref, em28xx_free_device);
354
355 return 0;
356 }
357
358 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
359 struct snd_pcm_hw_params *hw_params)
360 {
361 int ret;
362 struct em28xx *dev = snd_pcm_substream_chip(substream);
363
364 if (dev->disconnected)
365 return -ENODEV;
366
367 dprintk("Setting capture parameters\n");
368
369 ret = snd_pcm_alloc_vmalloc_buffer(substream,
370 params_buffer_bytes(hw_params));
371 if (ret < 0)
372 return ret;
373 #if 0
374 /* TODO: set up em28xx audio chip to deliver the correct audio format,
375 current default is 48000hz multiplexed => 96000hz mono
376 which shouldn't matter since analogue TV only supports mono */
377 unsigned int channels, rate, format;
378
379 format = params_format(hw_params);
380 rate = params_rate(hw_params);
381 channels = params_channels(hw_params);
382 #endif
383
384 return 0;
385 }
386
387 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
388 {
389 struct em28xx *dev = snd_pcm_substream_chip(substream);
390 struct em28xx_audio *adev = &dev->adev;
391
392 dprintk("Stop capture, if needed\n");
393
394 if (atomic_read(&adev->stream_started) > 0) {
395 atomic_set(&adev->stream_started, 0);
396 schedule_work(&adev->wq_trigger);
397 }
398
399 return 0;
400 }
401
402 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
403 {
404 struct em28xx *dev = snd_pcm_substream_chip(substream);
405
406 if (dev->disconnected)
407 return -ENODEV;
408
409 dev->adev.hwptr_done_capture = 0;
410 dev->adev.capture_transfer_done = 0;
411
412 return 0;
413 }
414
415 static void audio_trigger(struct work_struct *work)
416 {
417 struct em28xx_audio *adev =
418 container_of(work, struct em28xx_audio, wq_trigger);
419 struct em28xx *dev = container_of(adev, struct em28xx, adev);
420
421 if (atomic_read(&adev->stream_started)) {
422 dprintk("starting capture");
423 em28xx_init_audio_isoc(dev);
424 } else {
425 dprintk("stopping capture");
426 em28xx_deinit_isoc_audio(dev);
427 }
428 }
429
430 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
431 int cmd)
432 {
433 struct em28xx *dev = snd_pcm_substream_chip(substream);
434 int retval = 0;
435
436 if (dev->disconnected)
437 return -ENODEV;
438
439 switch (cmd) {
440 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
441 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
442 case SNDRV_PCM_TRIGGER_START:
443 atomic_set(&dev->adev.stream_started, 1);
444 break;
445 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
446 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
447 case SNDRV_PCM_TRIGGER_STOP:
448 atomic_set(&dev->adev.stream_started, 0);
449 break;
450 default:
451 retval = -EINVAL;
452 }
453 schedule_work(&dev->adev.wq_trigger);
454 return retval;
455 }
456
457 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
458 *substream)
459 {
460 unsigned long flags;
461 struct em28xx *dev;
462 snd_pcm_uframes_t hwptr_done;
463
464 dev = snd_pcm_substream_chip(substream);
465 if (dev->disconnected)
466 return SNDRV_PCM_POS_XRUN;
467
468 spin_lock_irqsave(&dev->adev.slock, flags);
469 hwptr_done = dev->adev.hwptr_done_capture;
470 spin_unlock_irqrestore(&dev->adev.slock, flags);
471
472 return hwptr_done;
473 }
474
475 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
476 unsigned long offset)
477 {
478 void *pageptr = subs->runtime->dma_area + offset;
479
480 return vmalloc_to_page(pageptr);
481 }
482
483 /*
484 * AC97 volume control support
485 */
486 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
487 struct snd_ctl_elem_info *info)
488 {
489 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
490
491 if (dev->disconnected)
492 return -ENODEV;
493
494 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
495 info->count = 2;
496 info->value.integer.min = 0;
497 info->value.integer.max = 0x1f;
498
499 return 0;
500 }
501
502 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
503 struct snd_ctl_elem_value *value)
504 {
505 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
506 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
507 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
508 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
509 int nonblock = 0;
510 int rc;
511
512 if (dev->disconnected)
513 return -ENODEV;
514
515 if (substream)
516 nonblock = !!(substream->f_flags & O_NONBLOCK);
517 if (nonblock) {
518 if (!mutex_trylock(&dev->lock))
519 return -EAGAIN;
520 } else
521 mutex_lock(&dev->lock);
522 rc = em28xx_read_ac97(dev, kcontrol->private_value);
523 if (rc < 0)
524 goto err;
525
526 val |= rc & 0x8000; /* Preserve the mute flag */
527
528 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
529 if (rc < 0)
530 goto err;
531
532 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
533 (val & 0x8000) ? "muted " : "",
534 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
535 val, (int)kcontrol->private_value);
536
537 err:
538 mutex_unlock(&dev->lock);
539 return rc;
540 }
541
542 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
543 struct snd_ctl_elem_value *value)
544 {
545 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
546 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
547 int nonblock = 0;
548 int val;
549
550 if (dev->disconnected)
551 return -ENODEV;
552
553 if (substream)
554 nonblock = !!(substream->f_flags & O_NONBLOCK);
555 if (nonblock) {
556 if (!mutex_trylock(&dev->lock))
557 return -EAGAIN;
558 } else
559 mutex_lock(&dev->lock);
560 val = em28xx_read_ac97(dev, kcontrol->private_value);
561 mutex_unlock(&dev->lock);
562 if (val < 0)
563 return val;
564
565 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
566 (val & 0x8000) ? "muted " : "",
567 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
568 val, (int)kcontrol->private_value);
569
570 value->value.integer.value[0] = 0x1f - (val & 0x1f);
571 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
572
573 return 0;
574 }
575
576 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
577 struct snd_ctl_elem_value *value)
578 {
579 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
580 u16 val = value->value.integer.value[0];
581 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
582 int nonblock = 0;
583 int rc;
584
585 if (dev->disconnected)
586 return -ENODEV;
587
588 if (substream)
589 nonblock = !!(substream->f_flags & O_NONBLOCK);
590 if (nonblock) {
591 if (!mutex_trylock(&dev->lock))
592 return -EAGAIN;
593 } else
594 mutex_lock(&dev->lock);
595 rc = em28xx_read_ac97(dev, kcontrol->private_value);
596 if (rc < 0)
597 goto err;
598
599 if (val)
600 rc &= 0x1f1f;
601 else
602 rc |= 0x8000;
603
604 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
605 if (rc < 0)
606 goto err;
607
608 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
609 (val & 0x8000) ? "muted " : "",
610 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
611 val, (int)kcontrol->private_value);
612
613 err:
614 mutex_unlock(&dev->lock);
615 return rc;
616 }
617
618 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
619 struct snd_ctl_elem_value *value)
620 {
621 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
622 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
623 int nonblock = 0;
624 int val;
625
626 if (dev->disconnected)
627 return -ENODEV;
628
629 if (substream)
630 nonblock = !!(substream->f_flags & O_NONBLOCK);
631 if (nonblock) {
632 if (!mutex_trylock(&dev->lock))
633 return -EAGAIN;
634 } else
635 mutex_lock(&dev->lock);
636 val = em28xx_read_ac97(dev, kcontrol->private_value);
637 mutex_unlock(&dev->lock);
638 if (val < 0)
639 return val;
640
641 if (val & 0x8000)
642 value->value.integer.value[0] = 0;
643 else
644 value->value.integer.value[0] = 1;
645
646 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
647 (val & 0x8000) ? "muted " : "",
648 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
649 val, (int)kcontrol->private_value);
650
651 return 0;
652 }
653
654 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
655
656 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
657 char *name, int id)
658 {
659 int err;
660 char ctl_name[44];
661 struct snd_kcontrol *kctl;
662 struct snd_kcontrol_new tmp;
663
664 memset(&tmp, 0, sizeof(tmp));
665 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
666 tmp.private_value = id,
667 tmp.name = ctl_name,
668
669 /* Add Mute Control */
670 sprintf(ctl_name, "%s Switch", name);
671 tmp.get = em28xx_vol_get_mute;
672 tmp.put = em28xx_vol_put_mute;
673 tmp.info = snd_ctl_boolean_mono_info;
674 kctl = snd_ctl_new1(&tmp, dev);
675 err = snd_ctl_add(card, kctl);
676 if (err < 0)
677 return err;
678 dprintk("Added control %s for ac97 volume control 0x%04x\n",
679 ctl_name, id);
680
681 memset(&tmp, 0, sizeof(tmp));
682 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
683 tmp.private_value = id,
684 tmp.name = ctl_name,
685
686 /* Add Volume Control */
687 sprintf(ctl_name, "%s Volume", name);
688 tmp.get = em28xx_vol_get;
689 tmp.put = em28xx_vol_put;
690 tmp.info = em28xx_vol_info;
691 tmp.tlv.p = em28xx_db_scale,
692 kctl = snd_ctl_new1(&tmp, dev);
693 err = snd_ctl_add(card, kctl);
694 if (err < 0)
695 return err;
696 dprintk("Added control %s for ac97 volume control 0x%04x\n",
697 ctl_name, id);
698
699 return 0;
700 }
701
702 /*
703 * register/unregister code and data
704 */
705 static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
706 .open = snd_em28xx_capture_open,
707 .close = snd_em28xx_pcm_close,
708 .ioctl = snd_pcm_lib_ioctl,
709 .hw_params = snd_em28xx_hw_capture_params,
710 .hw_free = snd_em28xx_hw_capture_free,
711 .prepare = snd_em28xx_prepare,
712 .trigger = snd_em28xx_capture_trigger,
713 .pointer = snd_em28xx_capture_pointer,
714 .page = snd_pcm_get_vmalloc_page,
715 };
716
717 static void em28xx_audio_free_urb(struct em28xx *dev)
718 {
719 struct usb_device *udev = interface_to_usbdev(dev->intf);
720 int i;
721
722 for (i = 0; i < dev->adev.num_urb; i++) {
723 struct urb *urb = dev->adev.urb[i];
724
725 if (!urb)
726 continue;
727
728 usb_free_coherent(udev, urb->transfer_buffer_length,
729 dev->adev.transfer_buffer[i],
730 urb->transfer_dma);
731
732 usb_free_urb(urb);
733 }
734 kfree(dev->adev.urb);
735 kfree(dev->adev.transfer_buffer);
736 dev->adev.num_urb = 0;
737 }
738
739 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
740 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
741 struct usb_endpoint_descriptor *e)
742 {
743 int size = le16_to_cpu(e->wMaxPacketSize);
744
745 if (udev->speed == USB_SPEED_HIGH)
746 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
747
748 return size & 0x7ff;
749 }
750
751 static int em28xx_audio_urb_init(struct em28xx *dev)
752 {
753 struct usb_interface *intf;
754 struct usb_endpoint_descriptor *e, *ep = NULL;
755 struct usb_device *udev = interface_to_usbdev(dev->intf);
756 int i, ep_size, interval, num_urb, npackets;
757 int urb_size, bytes_per_transfer;
758 u8 alt;
759
760 if (dev->ifnum)
761 alt = 1;
762 else
763 alt = 7;
764
765 intf = usb_ifnum_to_if(udev, dev->ifnum);
766
767 if (intf->num_altsetting <= alt) {
768 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
769 dev->ifnum, alt);
770 return -ENODEV;
771 }
772
773 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
774 e = &intf->altsetting[alt].endpoint[i].desc;
775 if (!usb_endpoint_dir_in(e))
776 continue;
777 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
778 ep = e;
779 break;
780 }
781 }
782
783 if (!ep) {
784 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
785 return -ENODEV;
786 }
787
788 ep_size = em28xx_audio_ep_packet_size(udev, ep);
789 interval = 1 << (ep->bInterval - 1);
790
791 dev_info(&dev->intf->dev,
792 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
793 EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
794 dev->ifnum, alt, interval, ep_size);
795
796 /* Calculate the number and size of URBs to better fit the audio samples */
797
798 /*
799 * Estimate the number of bytes per DMA transfer.
800 *
801 * This is given by the bit rate (for now, only 48000 Hz) multiplied
802 * by 2 channels and 2 bytes/sample divided by the number of microframe
803 * intervals and by the microframe rate (125 us)
804 */
805 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
806
807 /*
808 * Estimate the number of transfer URBs. Don't let it go past the
809 * maximum number of URBs that is known to be supported by the device.
810 */
811 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
812 if (num_urb > EM28XX_MAX_AUDIO_BUFS)
813 num_urb = EM28XX_MAX_AUDIO_BUFS;
814
815 /*
816 * Now that we know the number of bytes per transfer and the number of
817 * URBs, estimate the typical size of an URB, in order to adjust the
818 * minimal number of packets.
819 */
820 urb_size = bytes_per_transfer / num_urb;
821
822 /*
823 * Now, calculate the amount of audio packets to be filled on each
824 * URB. In order to preserve the old behaviour, use a minimal
825 * threshold for this value.
826 */
827 npackets = EM28XX_MIN_AUDIO_PACKETS;
828 if (urb_size > ep_size * npackets)
829 npackets = DIV_ROUND_UP(urb_size, ep_size);
830
831 dev_info(&dev->intf->dev,
832 "Number of URBs: %d, with %d packets and %d size\n",
833 num_urb, npackets, urb_size);
834
835 /* Estimate the bytes per period */
836 dev->adev.period = urb_size * npackets;
837
838 /* Allocate space to store the number of URBs to be used */
839
840 dev->adev.transfer_buffer = kcalloc(num_urb,
841 sizeof(*dev->adev.transfer_buffer),
842 GFP_ATOMIC);
843 if (!dev->adev.transfer_buffer) {
844 return -ENOMEM;
845 }
846
847 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
848 if (!dev->adev.urb) {
849 kfree(dev->adev.transfer_buffer);
850 return -ENOMEM;
851 }
852
853 /* Alloc memory for each URB and for each transfer buffer */
854 dev->adev.num_urb = num_urb;
855 for (i = 0; i < num_urb; i++) {
856 struct urb *urb;
857 int j, k;
858 void *buf;
859
860 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
861 if (!urb) {
862 em28xx_audio_free_urb(dev);
863 return -ENOMEM;
864 }
865 dev->adev.urb[i] = urb;
866
867 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_ATOMIC,
868 &urb->transfer_dma);
869 if (!buf) {
870 dev_err(&dev->intf->dev,
871 "usb_alloc_coherent failed!\n");
872 em28xx_audio_free_urb(dev);
873 return -ENOMEM;
874 }
875 dev->adev.transfer_buffer[i] = buf;
876
877 urb->dev = udev;
878 urb->context = dev;
879 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
880 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
881 urb->transfer_buffer = buf;
882 urb->interval = interval;
883 urb->complete = em28xx_audio_isocirq;
884 urb->number_of_packets = npackets;
885 urb->transfer_buffer_length = ep_size * npackets;
886
887 for (j = k = 0; j < npackets; j++, k += ep_size) {
888 urb->iso_frame_desc[j].offset = k;
889 urb->iso_frame_desc[j].length = ep_size;
890 }
891 }
892
893 return 0;
894 }
895
896 static int em28xx_audio_init(struct em28xx *dev)
897 {
898 struct em28xx_audio *adev = &dev->adev;
899 struct usb_device *udev = interface_to_usbdev(dev->intf);
900 struct snd_pcm *pcm;
901 struct snd_card *card;
902 static int devnr;
903 int err;
904
905 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
906 /* This device does not support the extension (in this case
907 the device is expecting the snd-usb-audio module or
908 doesn't have analog audio support at all) */
909 return 0;
910 }
911
912 dev_info(&dev->intf->dev, "Binding audio extension\n");
913
914 kref_get(&dev->ref);
915
916 dev_info(&dev->intf->dev,
917 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
918 dev_info(&dev->intf->dev,
919 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
920
921 err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
922 THIS_MODULE, 0, &card);
923 if (err < 0)
924 return err;
925
926 spin_lock_init(&adev->slock);
927 adev->sndcard = card;
928 adev->udev = udev;
929
930 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
931 if (err < 0)
932 goto card_free;
933
934 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
935 pcm->info_flags = 0;
936 pcm->private_data = dev;
937 strcpy(pcm->name, "Empia 28xx Capture");
938
939 strcpy(card->driver, "Em28xx-Audio");
940 strcpy(card->shortname, "Em28xx Audio");
941 strcpy(card->longname, "Empia Em28xx Audio");
942
943 INIT_WORK(&adev->wq_trigger, audio_trigger);
944
945 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
946 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
947 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
948 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
949 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
950 em28xx_cvol_new(card, dev, "CD", AC97_CD);
951 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
952 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
953
954 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
955 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
956 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
957 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
958 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
959 }
960
961 err = em28xx_audio_urb_init(dev);
962 if (err)
963 goto card_free;
964
965 err = snd_card_register(card);
966 if (err < 0)
967 goto urb_free;
968
969 dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
970 return 0;
971
972 urb_free:
973 em28xx_audio_free_urb(dev);
974
975 card_free:
976 snd_card_free(card);
977 adev->sndcard = NULL;
978
979 return err;
980 }
981
982 static int em28xx_audio_fini(struct em28xx *dev)
983 {
984 if (dev == NULL)
985 return 0;
986
987 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
988 /* This device does not support the extension (in this case
989 the device is expecting the snd-usb-audio module or
990 doesn't have analog audio support at all) */
991 return 0;
992 }
993
994 dev_info(&dev->intf->dev, "Closing audio extension\n");
995
996 if (dev->adev.sndcard) {
997 snd_card_disconnect(dev->adev.sndcard);
998 flush_work(&dev->adev.wq_trigger);
999
1000 em28xx_audio_free_urb(dev);
1001
1002 snd_card_free(dev->adev.sndcard);
1003 dev->adev.sndcard = NULL;
1004 }
1005
1006 kref_put(&dev->ref, em28xx_free_device);
1007 return 0;
1008 }
1009
1010 static int em28xx_audio_suspend(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 dev_info(&dev->intf->dev, "Suspending audio extension\n");
1019 em28xx_deinit_isoc_audio(dev);
1020 atomic_set(&dev->adev.stream_started, 0);
1021 return 0;
1022 }
1023
1024 static int em28xx_audio_resume(struct em28xx *dev)
1025 {
1026 if (dev == NULL)
1027 return 0;
1028
1029 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1030 return 0;
1031
1032 dev_info(&dev->intf->dev, "Resuming audio extension\n");
1033 /* Nothing to do other than schedule_work() ?? */
1034 schedule_work(&dev->adev.wq_trigger);
1035 return 0;
1036 }
1037
1038 static struct em28xx_ops audio_ops = {
1039 .id = EM28XX_AUDIO,
1040 .name = "Em28xx Audio Extension",
1041 .init = em28xx_audio_init,
1042 .fini = em28xx_audio_fini,
1043 .suspend = em28xx_audio_suspend,
1044 .resume = em28xx_audio_resume,
1045 };
1046
1047 static int __init em28xx_alsa_register(void)
1048 {
1049 return em28xx_register_extension(&audio_ops);
1050 }
1051
1052 static void __exit em28xx_alsa_unregister(void)
1053 {
1054 em28xx_unregister_extension(&audio_ops);
1055 }
1056
1057 MODULE_LICENSE("GPL");
1058 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1059 MODULE_AUTHOR("Mauro Carvalho Chehab");
1060 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1061 MODULE_VERSION(EM28XX_VERSION);
1062
1063 module_init(em28xx_alsa_register);
1064 module_exit(em28xx_alsa_unregister);
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