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Merge branch 'for-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
[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
24 #include "em28xx.h"
25
26 #include <linux/kernel.h>
27 #include <linux/usb.h>
28 #include <linux/init.h>
29 #include <linux/sound.h>
30 #include <linux/spinlock.h>
31 #include <linux/soundcard.h>
32 #include <linux/slab.h>
33 #include <linux/vmalloc.h>
34 #include <linux/proc_fs.h>
35 #include <linux/module.h>
36 #include <sound/core.h>
37 #include <sound/pcm.h>
38 #include <sound/pcm_params.h>
39 #include <sound/info.h>
40 #include <sound/initval.h>
41 #include <sound/control.h>
42 #include <sound/tlv.h>
43 #include <sound/ac97_codec.h>
44 #include <media/v4l2-common.h>
45
46 static int debug;
47 module_param(debug, int, 0644);
48 MODULE_PARM_DESC(debug, "activates debug info");
49
50 #define EM28XX_MAX_AUDIO_BUFS 5
51 #define EM28XX_MIN_AUDIO_PACKETS 64
52
53 #define dprintk(fmt, arg...) do { \
54 if (debug) \
55 dev_printk(KERN_DEBUG, &dev->intf->dev, \
56 "video: %s: " fmt, __func__, ## arg); \
57 } while (0)
58
59 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
60
61 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
62 {
63 int i;
64
65 dprintk("Stopping isoc\n");
66 for (i = 0; i < dev->adev.num_urb; i++) {
67 struct urb *urb = dev->adev.urb[i];
68
69 if (!irqs_disabled())
70 usb_kill_urb(urb);
71 else
72 usb_unlink_urb(urb);
73 }
74
75 return 0;
76 }
77
78 static void em28xx_audio_isocirq(struct urb *urb)
79 {
80 struct em28xx *dev = urb->context;
81 int i;
82 unsigned int oldptr;
83 int period_elapsed = 0;
84 int status;
85 unsigned char *cp;
86 unsigned int stride;
87 struct snd_pcm_substream *substream;
88 struct snd_pcm_runtime *runtime;
89
90 if (dev->disconnected) {
91 dprintk("device disconnected while streaming. URB status=%d.\n",
92 urb->status);
93 atomic_set(&dev->adev.stream_started, 0);
94 return;
95 }
96
97 switch (urb->status) {
98 case 0: /* success */
99 case -ETIMEDOUT: /* NAK */
100 break;
101 case -ECONNRESET: /* kill */
102 case -ENOENT:
103 case -ESHUTDOWN:
104 return;
105 default: /* error */
106 dprintk("urb completition error %d.\n", urb->status);
107 break;
108 }
109
110 if (atomic_read(&dev->adev.stream_started) == 0)
111 return;
112
113 if (dev->adev.capture_pcm_substream) {
114 substream = dev->adev.capture_pcm_substream;
115 runtime = substream->runtime;
116 stride = runtime->frame_bits >> 3;
117
118 for (i = 0; i < urb->number_of_packets; i++) {
119 int length =
120 urb->iso_frame_desc[i].actual_length / stride;
121 cp = (unsigned char *)urb->transfer_buffer +
122 urb->iso_frame_desc[i].offset;
123
124 if (!length)
125 continue;
126
127 oldptr = dev->adev.hwptr_done_capture;
128 if (oldptr + length >= runtime->buffer_size) {
129 unsigned int cnt =
130 runtime->buffer_size - oldptr;
131 memcpy(runtime->dma_area + oldptr * stride, cp,
132 cnt * stride);
133 memcpy(runtime->dma_area, cp + cnt * stride,
134 length * stride - cnt * stride);
135 } else {
136 memcpy(runtime->dma_area + oldptr * stride, cp,
137 length * stride);
138 }
139
140 snd_pcm_stream_lock(substream);
141
142 dev->adev.hwptr_done_capture += length;
143 if (dev->adev.hwptr_done_capture >=
144 runtime->buffer_size)
145 dev->adev.hwptr_done_capture -=
146 runtime->buffer_size;
147
148 dev->adev.capture_transfer_done += length;
149 if (dev->adev.capture_transfer_done >=
150 runtime->period_size) {
151 dev->adev.capture_transfer_done -=
152 runtime->period_size;
153 period_elapsed = 1;
154 }
155
156 snd_pcm_stream_unlock(substream);
157 }
158 if (period_elapsed)
159 snd_pcm_period_elapsed(substream);
160 }
161 urb->status = 0;
162
163 status = usb_submit_urb(urb, GFP_ATOMIC);
164 if (status < 0)
165 dev_err(&dev->intf->dev,
166 "resubmit of audio urb failed (error=%i)\n",
167 status);
168 return;
169 }
170
171 static int em28xx_init_audio_isoc(struct em28xx *dev)
172 {
173 int i, errCode;
174
175 dprintk("Starting isoc transfers\n");
176
177 /* Start streaming */
178 for (i = 0; i < dev->adev.num_urb; i++) {
179 memset(dev->adev.transfer_buffer[i], 0x80,
180 dev->adev.urb[i]->transfer_buffer_length);
181
182 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
183 if (errCode) {
184 dev_err(&dev->intf->dev,
185 "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 em28xx *dev = snd_pcm_substream_chip(subs);
201 struct snd_pcm_runtime *runtime = subs->runtime;
202
203 dprintk("Allocating vbuffer\n");
204 if (runtime->dma_area) {
205 if (runtime->dma_bytes > size)
206 return 0;
207
208 vfree(runtime->dma_area);
209 }
210 runtime->dma_area = vmalloc(size);
211 if (!runtime->dma_area)
212 return -ENOMEM;
213
214 runtime->dma_bytes = size;
215
216 return 0;
217 }
218
219 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
220 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
221 SNDRV_PCM_INFO_MMAP |
222 SNDRV_PCM_INFO_INTERLEAVED |
223 SNDRV_PCM_INFO_BATCH |
224 SNDRV_PCM_INFO_MMAP_VALID,
225
226 .formats = SNDRV_PCM_FMTBIT_S16_LE,
227
228 .rates = SNDRV_PCM_RATE_48000,
229
230 .rate_min = 48000,
231 .rate_max = 48000,
232 .channels_min = 2,
233 .channels_max = 2,
234 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
235
236 /*
237 * The period is 12.288 bytes. Allow a 10% of variation along its
238 * value, in order to avoid overruns/underruns due to some clock
239 * drift.
240 *
241 * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
242 * Calculate it dynamically.
243 */
244 .period_bytes_min = 11059,
245 .period_bytes_max = 13516,
246
247 .periods_min = 2,
248 .periods_max = 98, /* 12544, */
249 };
250
251 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
252 {
253 struct em28xx *dev = snd_pcm_substream_chip(substream);
254 struct snd_pcm_runtime *runtime = substream->runtime;
255 int nonblock, ret = 0;
256
257 if (!dev) {
258 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
259 return -ENODEV;
260 }
261
262 if (dev->disconnected)
263 return -ENODEV;
264
265 dprintk("opening device and trying to acquire exclusive lock\n");
266
267 nonblock = !!(substream->f_flags & O_NONBLOCK);
268 if (nonblock) {
269 if (!mutex_trylock(&dev->lock))
270 return -EAGAIN;
271 } else
272 mutex_lock(&dev->lock);
273
274 runtime->hw = snd_em28xx_hw_capture;
275
276 if (dev->adev.users == 0) {
277 if (dev->alt == 0 || dev->is_audio_only) {
278 struct usb_device *udev = interface_to_usbdev(dev->intf);
279
280 if (dev->is_audio_only)
281 /* audio is on a separate interface */
282 dev->alt = 1;
283 else
284 /* audio is on the same interface as video */
285 dev->alt = 7;
286 /*
287 * FIXME: The intention seems to be to select
288 * the alt setting with the largest
289 * wMaxPacketSize for the video endpoint.
290 * At least dev->alt should be used instead, but
291 * we should probably not touch it at all if it
292 * is already >0, because wMaxPacketSize of the
293 * audio endpoints seems to be the same for all.
294 */
295 dprintk("changing alternate number on interface %d to %d\n",
296 dev->ifnum, dev->alt);
297 usb_set_interface(udev, dev->ifnum, dev->alt);
298 }
299
300 /* Sets volume, mute, etc */
301 dev->mute = 0;
302 ret = em28xx_audio_analog_set(dev);
303 if (ret < 0)
304 goto err;
305 }
306
307 kref_get(&dev->ref);
308 dev->adev.users++;
309 mutex_unlock(&dev->lock);
310
311 /* Dynamically adjust the period size */
312 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
313 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
314 dev->adev.period * 95 / 100,
315 dev->adev.period * 105 / 100);
316
317 dev->adev.capture_pcm_substream = substream;
318
319 return 0;
320 err:
321 mutex_unlock(&dev->lock);
322
323 dev_err(&dev->intf->dev,
324 "Error while configuring em28xx mixer\n");
325 return ret;
326 }
327
328 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
329 {
330 struct em28xx *dev = snd_pcm_substream_chip(substream);
331
332 dprintk("closing device\n");
333
334 dev->mute = 1;
335 mutex_lock(&dev->lock);
336 dev->adev.users--;
337 if (atomic_read(&dev->adev.stream_started) > 0) {
338 atomic_set(&dev->adev.stream_started, 0);
339 schedule_work(&dev->adev.wq_trigger);
340 }
341
342 em28xx_audio_analog_set(dev);
343 if (substream->runtime->dma_area) {
344 dprintk("freeing\n");
345 vfree(substream->runtime->dma_area);
346 substream->runtime->dma_area = NULL;
347 }
348 mutex_unlock(&dev->lock);
349 kref_put(&dev->ref, em28xx_free_device);
350
351 return 0;
352 }
353
354 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
355 struct snd_pcm_hw_params *hw_params)
356 {
357 int ret;
358 struct em28xx *dev = snd_pcm_substream_chip(substream);
359
360 if (dev->disconnected)
361 return -ENODEV;
362
363 dprintk("Setting capture parameters\n");
364
365 ret = snd_pcm_alloc_vmalloc_buffer(substream,
366 params_buffer_bytes(hw_params));
367 if (ret < 0)
368 return ret;
369 #if 0
370 /* TODO: set up em28xx audio chip to deliver the correct audio format,
371 current default is 48000hz multiplexed => 96000hz mono
372 which shouldn't matter since analogue TV only supports mono */
373 unsigned int channels, rate, format;
374
375 format = params_format(hw_params);
376 rate = params_rate(hw_params);
377 channels = params_channels(hw_params);
378 #endif
379
380 return 0;
381 }
382
383 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
384 {
385 struct em28xx *dev = snd_pcm_substream_chip(substream);
386 struct em28xx_audio *adev = &dev->adev;
387
388 dprintk("Stop capture, if needed\n");
389
390 if (atomic_read(&adev->stream_started) > 0) {
391 atomic_set(&adev->stream_started, 0);
392 schedule_work(&adev->wq_trigger);
393 }
394
395 return 0;
396 }
397
398 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
399 {
400 struct em28xx *dev = snd_pcm_substream_chip(substream);
401
402 if (dev->disconnected)
403 return -ENODEV;
404
405 dev->adev.hwptr_done_capture = 0;
406 dev->adev.capture_transfer_done = 0;
407
408 return 0;
409 }
410
411 static void audio_trigger(struct work_struct *work)
412 {
413 struct em28xx_audio *adev =
414 container_of(work, struct em28xx_audio, wq_trigger);
415 struct em28xx *dev = container_of(adev, struct em28xx, adev);
416
417 if (atomic_read(&adev->stream_started)) {
418 dprintk("starting capture");
419 em28xx_init_audio_isoc(dev);
420 } else {
421 dprintk("stopping capture");
422 em28xx_deinit_isoc_audio(dev);
423 }
424 }
425
426 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
427 int cmd)
428 {
429 struct em28xx *dev = snd_pcm_substream_chip(substream);
430 int retval = 0;
431
432 if (dev->disconnected)
433 return -ENODEV;
434
435 switch (cmd) {
436 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
437 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
438 case SNDRV_PCM_TRIGGER_START:
439 atomic_set(&dev->adev.stream_started, 1);
440 break;
441 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
442 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
443 case SNDRV_PCM_TRIGGER_STOP:
444 atomic_set(&dev->adev.stream_started, 0);
445 break;
446 default:
447 retval = -EINVAL;
448 }
449 schedule_work(&dev->adev.wq_trigger);
450 return retval;
451 }
452
453 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
454 *substream)
455 {
456 unsigned long flags;
457 struct em28xx *dev;
458 snd_pcm_uframes_t hwptr_done;
459
460 dev = snd_pcm_substream_chip(substream);
461 if (dev->disconnected)
462 return SNDRV_PCM_POS_XRUN;
463
464 spin_lock_irqsave(&dev->adev.slock, flags);
465 hwptr_done = dev->adev.hwptr_done_capture;
466 spin_unlock_irqrestore(&dev->adev.slock, flags);
467
468 return hwptr_done;
469 }
470
471 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
472 unsigned long offset)
473 {
474 void *pageptr = subs->runtime->dma_area + offset;
475
476 return vmalloc_to_page(pageptr);
477 }
478
479 /*
480 * AC97 volume control support
481 */
482 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
483 struct snd_ctl_elem_info *info)
484 {
485 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
486
487 if (dev->disconnected)
488 return -ENODEV;
489
490 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
491 info->count = 2;
492 info->value.integer.min = 0;
493 info->value.integer.max = 0x1f;
494
495 return 0;
496 }
497
498 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
499 struct snd_ctl_elem_value *value)
500 {
501 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
502 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
503 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
504 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
505 int nonblock = 0;
506 int rc;
507
508 if (dev->disconnected)
509 return -ENODEV;
510
511 if (substream)
512 nonblock = !!(substream->f_flags & O_NONBLOCK);
513 if (nonblock) {
514 if (!mutex_trylock(&dev->lock))
515 return -EAGAIN;
516 } else
517 mutex_lock(&dev->lock);
518 rc = em28xx_read_ac97(dev, kcontrol->private_value);
519 if (rc < 0)
520 goto err;
521
522 val |= rc & 0x8000; /* Preserve the mute flag */
523
524 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
525 if (rc < 0)
526 goto err;
527
528 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
529 (val & 0x8000) ? "muted " : "",
530 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
531 val, (int)kcontrol->private_value);
532
533 err:
534 mutex_unlock(&dev->lock);
535 return rc;
536 }
537
538 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
539 struct snd_ctl_elem_value *value)
540 {
541 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
542 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
543 int nonblock = 0;
544 int val;
545
546 if (dev->disconnected)
547 return -ENODEV;
548
549 if (substream)
550 nonblock = !!(substream->f_flags & O_NONBLOCK);
551 if (nonblock) {
552 if (!mutex_trylock(&dev->lock))
553 return -EAGAIN;
554 } else
555 mutex_lock(&dev->lock);
556 val = em28xx_read_ac97(dev, kcontrol->private_value);
557 mutex_unlock(&dev->lock);
558 if (val < 0)
559 return val;
560
561 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
562 (val & 0x8000) ? "muted " : "",
563 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
564 val, (int)kcontrol->private_value);
565
566 value->value.integer.value[0] = 0x1f - (val & 0x1f);
567 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
568
569 return 0;
570 }
571
572 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
573 struct snd_ctl_elem_value *value)
574 {
575 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
576 u16 val = value->value.integer.value[0];
577 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
578 int nonblock = 0;
579 int rc;
580
581 if (dev->disconnected)
582 return -ENODEV;
583
584 if (substream)
585 nonblock = !!(substream->f_flags & O_NONBLOCK);
586 if (nonblock) {
587 if (!mutex_trylock(&dev->lock))
588 return -EAGAIN;
589 } else
590 mutex_lock(&dev->lock);
591 rc = em28xx_read_ac97(dev, kcontrol->private_value);
592 if (rc < 0)
593 goto err;
594
595 if (val)
596 rc &= 0x1f1f;
597 else
598 rc |= 0x8000;
599
600 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
601 if (rc < 0)
602 goto err;
603
604 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
605 (val & 0x8000) ? "muted " : "",
606 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
607 val, (int)kcontrol->private_value);
608
609 err:
610 mutex_unlock(&dev->lock);
611 return rc;
612 }
613
614 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
615 struct snd_ctl_elem_value *value)
616 {
617 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
618 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
619 int nonblock = 0;
620 int val;
621
622 if (dev->disconnected)
623 return -ENODEV;
624
625 if (substream)
626 nonblock = !!(substream->f_flags & O_NONBLOCK);
627 if (nonblock) {
628 if (!mutex_trylock(&dev->lock))
629 return -EAGAIN;
630 } else
631 mutex_lock(&dev->lock);
632 val = em28xx_read_ac97(dev, kcontrol->private_value);
633 mutex_unlock(&dev->lock);
634 if (val < 0)
635 return val;
636
637 if (val & 0x8000)
638 value->value.integer.value[0] = 0;
639 else
640 value->value.integer.value[0] = 1;
641
642 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
643 (val & 0x8000) ? "muted " : "",
644 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
645 val, (int)kcontrol->private_value);
646
647 return 0;
648 }
649
650 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
651
652 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
653 char *name, int id)
654 {
655 int err;
656 char ctl_name[44];
657 struct snd_kcontrol *kctl;
658 struct snd_kcontrol_new tmp;
659
660 memset(&tmp, 0, sizeof(tmp));
661 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
662 tmp.private_value = id,
663 tmp.name = ctl_name,
664
665 /* Add Mute Control */
666 sprintf(ctl_name, "%s Switch", name);
667 tmp.get = em28xx_vol_get_mute;
668 tmp.put = em28xx_vol_put_mute;
669 tmp.info = snd_ctl_boolean_mono_info;
670 kctl = snd_ctl_new1(&tmp, dev);
671 err = snd_ctl_add(card, kctl);
672 if (err < 0)
673 return err;
674 dprintk("Added control %s for ac97 volume control 0x%04x\n",
675 ctl_name, id);
676
677 memset(&tmp, 0, sizeof(tmp));
678 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
679 tmp.private_value = id,
680 tmp.name = ctl_name,
681
682 /* Add Volume Control */
683 sprintf(ctl_name, "%s Volume", name);
684 tmp.get = em28xx_vol_get;
685 tmp.put = em28xx_vol_put;
686 tmp.info = em28xx_vol_info;
687 tmp.tlv.p = em28xx_db_scale,
688 kctl = snd_ctl_new1(&tmp, dev);
689 err = snd_ctl_add(card, kctl);
690 if (err < 0)
691 return err;
692 dprintk("Added control %s for ac97 volume control 0x%04x\n",
693 ctl_name, id);
694
695 return 0;
696 }
697
698 /*
699 * register/unregister code and data
700 */
701 static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
702 .open = snd_em28xx_capture_open,
703 .close = snd_em28xx_pcm_close,
704 .ioctl = snd_pcm_lib_ioctl,
705 .hw_params = snd_em28xx_hw_capture_params,
706 .hw_free = snd_em28xx_hw_capture_free,
707 .prepare = snd_em28xx_prepare,
708 .trigger = snd_em28xx_capture_trigger,
709 .pointer = snd_em28xx_capture_pointer,
710 .page = snd_pcm_get_vmalloc_page,
711 };
712
713 static void em28xx_audio_free_urb(struct em28xx *dev)
714 {
715 struct usb_device *udev = interface_to_usbdev(dev->intf);
716 int i;
717
718 for (i = 0; i < dev->adev.num_urb; i++) {
719 struct urb *urb = dev->adev.urb[i];
720
721 if (!urb)
722 continue;
723
724 usb_free_coherent(udev, urb->transfer_buffer_length,
725 dev->adev.transfer_buffer[i],
726 urb->transfer_dma);
727
728 usb_free_urb(urb);
729 }
730 kfree(dev->adev.urb);
731 kfree(dev->adev.transfer_buffer);
732 dev->adev.num_urb = 0;
733 }
734
735 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
736 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
737 struct usb_endpoint_descriptor *e)
738 {
739 int size = le16_to_cpu(e->wMaxPacketSize);
740
741 if (udev->speed == USB_SPEED_HIGH)
742 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
743
744 return size & 0x7ff;
745 }
746
747 static int em28xx_audio_urb_init(struct em28xx *dev)
748 {
749 struct usb_interface *intf;
750 struct usb_endpoint_descriptor *e, *ep = NULL;
751 struct usb_device *udev = interface_to_usbdev(dev->intf);
752 int i, ep_size, interval, num_urb, npackets;
753 int urb_size, bytes_per_transfer;
754 u8 alt;
755
756 if (dev->ifnum)
757 alt = 1;
758 else
759 alt = 7;
760
761 intf = usb_ifnum_to_if(udev, dev->ifnum);
762
763 if (intf->num_altsetting <= alt) {
764 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
765 dev->ifnum, alt);
766 return -ENODEV;
767 }
768
769 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
770 e = &intf->altsetting[alt].endpoint[i].desc;
771 if (!usb_endpoint_dir_in(e))
772 continue;
773 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
774 ep = e;
775 break;
776 }
777 }
778
779 if (!ep) {
780 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
781 return -ENODEV;
782 }
783
784 ep_size = em28xx_audio_ep_packet_size(udev, ep);
785 interval = 1 << (ep->bInterval - 1);
786
787 dev_info(&dev->intf->dev,
788 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
789 EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
790 dev->ifnum, alt, interval, ep_size);
791
792 /* Calculate the number and size of URBs to better fit the audio samples */
793
794 /*
795 * Estimate the number of bytes per DMA transfer.
796 *
797 * This is given by the bit rate (for now, only 48000 Hz) multiplied
798 * by 2 channels and 2 bytes/sample divided by the number of microframe
799 * intervals and by the microframe rate (125 us)
800 */
801 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
802
803 /*
804 * Estimate the number of transfer URBs. Don't let it go past the
805 * maximum number of URBs that is known to be supported by the device.
806 */
807 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
808 if (num_urb > EM28XX_MAX_AUDIO_BUFS)
809 num_urb = EM28XX_MAX_AUDIO_BUFS;
810
811 /*
812 * Now that we know the number of bytes per transfer and the number of
813 * URBs, estimate the typical size of an URB, in order to adjust the
814 * minimal number of packets.
815 */
816 urb_size = bytes_per_transfer / num_urb;
817
818 /*
819 * Now, calculate the amount of audio packets to be filled on each
820 * URB. In order to preserve the old behaviour, use a minimal
821 * threshold for this value.
822 */
823 npackets = EM28XX_MIN_AUDIO_PACKETS;
824 if (urb_size > ep_size * npackets)
825 npackets = DIV_ROUND_UP(urb_size, ep_size);
826
827 dev_info(&dev->intf->dev,
828 "Number of URBs: %d, with %d packets and %d size\n",
829 num_urb, npackets, urb_size);
830
831 /* Estimate the bytes per period */
832 dev->adev.period = urb_size * npackets;
833
834 /* Allocate space to store the number of URBs to be used */
835
836 dev->adev.transfer_buffer = kcalloc(num_urb,
837 sizeof(*dev->adev.transfer_buffer),
838 GFP_ATOMIC);
839 if (!dev->adev.transfer_buffer) {
840 return -ENOMEM;
841 }
842
843 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
844 if (!dev->adev.urb) {
845 kfree(dev->adev.transfer_buffer);
846 return -ENOMEM;
847 }
848
849 /* Alloc memory for each URB and for each transfer buffer */
850 dev->adev.num_urb = num_urb;
851 for (i = 0; i < num_urb; i++) {
852 struct urb *urb;
853 int j, k;
854 void *buf;
855
856 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
857 if (!urb) {
858 em28xx_audio_free_urb(dev);
859 return -ENOMEM;
860 }
861 dev->adev.urb[i] = urb;
862
863 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_ATOMIC,
864 &urb->transfer_dma);
865 if (!buf) {
866 dev_err(&dev->intf->dev,
867 "usb_alloc_coherent failed!\n");
868 em28xx_audio_free_urb(dev);
869 return -ENOMEM;
870 }
871 dev->adev.transfer_buffer[i] = buf;
872
873 urb->dev = udev;
874 urb->context = dev;
875 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
876 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
877 urb->transfer_buffer = buf;
878 urb->interval = interval;
879 urb->complete = em28xx_audio_isocirq;
880 urb->number_of_packets = npackets;
881 urb->transfer_buffer_length = ep_size * npackets;
882
883 for (j = k = 0; j < npackets; j++, k += ep_size) {
884 urb->iso_frame_desc[j].offset = k;
885 urb->iso_frame_desc[j].length = ep_size;
886 }
887 }
888
889 return 0;
890 }
891
892 static int em28xx_audio_init(struct em28xx *dev)
893 {
894 struct em28xx_audio *adev = &dev->adev;
895 struct usb_device *udev = interface_to_usbdev(dev->intf);
896 struct snd_pcm *pcm;
897 struct snd_card *card;
898 static int devnr;
899 int err;
900
901 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
902 /* This device does not support the extension (in this case
903 the device is expecting the snd-usb-audio module or
904 doesn't have analog audio support at all) */
905 return 0;
906 }
907
908 dev_info(&dev->intf->dev, "Binding audio extension\n");
909
910 kref_get(&dev->ref);
911
912 dev_info(&dev->intf->dev,
913 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
914 dev_info(&dev->intf->dev,
915 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
916
917 err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
918 THIS_MODULE, 0, &card);
919 if (err < 0)
920 return err;
921
922 spin_lock_init(&adev->slock);
923 adev->sndcard = card;
924 adev->udev = udev;
925
926 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
927 if (err < 0)
928 goto card_free;
929
930 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
931 pcm->info_flags = 0;
932 pcm->private_data = dev;
933 strcpy(pcm->name, "Empia 28xx Capture");
934
935 strcpy(card->driver, "Em28xx-Audio");
936 strcpy(card->shortname, "Em28xx Audio");
937 strcpy(card->longname, "Empia Em28xx Audio");
938
939 INIT_WORK(&adev->wq_trigger, audio_trigger);
940
941 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
942 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
943 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
944 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
945 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
946 em28xx_cvol_new(card, dev, "CD", AC97_CD);
947 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
948 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
949
950 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
951 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
952 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
953 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
954 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
955 }
956
957 err = em28xx_audio_urb_init(dev);
958 if (err)
959 goto card_free;
960
961 err = snd_card_register(card);
962 if (err < 0)
963 goto urb_free;
964
965 dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
966 return 0;
967
968 urb_free:
969 em28xx_audio_free_urb(dev);
970
971 card_free:
972 snd_card_free(card);
973 adev->sndcard = NULL;
974
975 return err;
976 }
977
978 static int em28xx_audio_fini(struct em28xx *dev)
979 {
980 if (dev == NULL)
981 return 0;
982
983 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
984 /* This device does not support the extension (in this case
985 the device is expecting the snd-usb-audio module or
986 doesn't have analog audio support at all) */
987 return 0;
988 }
989
990 dev_info(&dev->intf->dev, "Closing audio extension\n");
991
992 if (dev->adev.sndcard) {
993 snd_card_disconnect(dev->adev.sndcard);
994 flush_work(&dev->adev.wq_trigger);
995
996 em28xx_audio_free_urb(dev);
997
998 snd_card_free(dev->adev.sndcard);
999 dev->adev.sndcard = NULL;
1000 }
1001
1002 kref_put(&dev->ref, em28xx_free_device);
1003 return 0;
1004 }
1005
1006 static int em28xx_audio_suspend(struct em28xx *dev)
1007 {
1008 if (dev == NULL)
1009 return 0;
1010
1011 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1012 return 0;
1013
1014 dev_info(&dev->intf->dev, "Suspending audio extension\n");
1015 em28xx_deinit_isoc_audio(dev);
1016 atomic_set(&dev->adev.stream_started, 0);
1017 return 0;
1018 }
1019
1020 static int em28xx_audio_resume(struct em28xx *dev)
1021 {
1022 if (dev == NULL)
1023 return 0;
1024
1025 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1026 return 0;
1027
1028 dev_info(&dev->intf->dev, "Resuming audio extension\n");
1029 /* Nothing to do other than schedule_work() ?? */
1030 schedule_work(&dev->adev.wq_trigger);
1031 return 0;
1032 }
1033
1034 static struct em28xx_ops audio_ops = {
1035 .id = EM28XX_AUDIO,
1036 .name = "Em28xx Audio Extension",
1037 .init = em28xx_audio_init,
1038 .fini = em28xx_audio_fini,
1039 .suspend = em28xx_audio_suspend,
1040 .resume = em28xx_audio_resume,
1041 };
1042
1043 static int __init em28xx_alsa_register(void)
1044 {
1045 return em28xx_register_extension(&audio_ops);
1046 }
1047
1048 static void __exit em28xx_alsa_unregister(void)
1049 {
1050 em28xx_unregister_extension(&audio_ops);
1051 }
1052
1053 MODULE_LICENSE("GPL");
1054 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1055 MODULE_AUTHOR("Mauro Carvalho Chehab");
1056 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1057 MODULE_VERSION(EM28XX_VERSION);
1058
1059 module_init(em28xx_alsa_register);
1060 module_exit(em28xx_alsa_unregister);
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