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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / media / usb / em28xx / em28xx-audio.c
blob05e9bd11a3ff016128e6c9dd05e1086cd454ce0e
1 /*
2 * Empiatech em28x1 audio extension
3 *
4 * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
5 *
6 * Copyright (C) 2007-2014 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 <linux/kernel.h>
29 #include <linux/usb.h>
30 #include <linux/init.h>
31 #include <linux/sound.h>
32 #include <linux/spinlock.h>
33 #include <linux/soundcard.h>
34 #include <linux/slab.h>
35 #include <linux/vmalloc.h>
36 #include <linux/proc_fs.h>
37 #include <linux/module.h>
38 #include <sound/core.h>
39 #include <sound/pcm.h>
40 #include <sound/pcm_params.h>
41 #include <sound/info.h>
42 #include <sound/initval.h>
43 #include <sound/control.h>
44 #include <sound/tlv.h>
45 #include <sound/ac97_codec.h>
46 #include <media/v4l2-common.h>
47 #include "em28xx.h"
48
49 static int debug;
50 module_param(debug, int, 0644);
51 MODULE_PARM_DESC(debug, "activates debug info");
52
53 #define EM28XX_MAX_AUDIO_BUFS 5
54 #define EM28XX_MIN_AUDIO_PACKETS 64
55
56 #define dprintk(fmt, arg...) do { \
57 if (debug) \
58 printk(KERN_INFO "em28xx-audio %s: " fmt, \
59 __func__, ##arg); \
60 } 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->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->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 em28xx_errdev("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 em28xx_errdev("submit of audio urb failed (error=%i)\n",
186 errCode);
187 em28xx_deinit_isoc_audio(dev);
188 atomic_set(&dev->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 /*
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 ret = 0;
256
257 if (!dev) {
258 em28xx_err("BUG: em28xx can't find device struct."
259 " Can't proceed with open\n");
260 return -ENODEV;
261 }
262
263 if (dev->disconnected)
264 return -ENODEV;
265
266 dprintk("opening device and trying to acquire exclusive lock\n");
267
268 runtime->hw = snd_em28xx_hw_capture;
269 if ((dev->alt == 0 || dev->is_audio_only) && dev->adev.users == 0) {
270 int nonblock = !!(substream->f_flags & O_NONBLOCK);
271
272 if (nonblock) {
273 if (!mutex_trylock(&dev->lock))
274 return -EAGAIN;
275 } else
276 mutex_lock(&dev->lock);
277 if (dev->is_audio_only)
278 /* vendor audio is on a separate interface */
279 dev->alt = 1;
280 else
281 /* vendor audio is on the same interface as video */
282 dev->alt = 7;
283 /*
284 * FIXME: The intention seems to be to select the alt
285 * setting with the largest wMaxPacketSize for the video
286 * endpoint.
287 * At least dev->alt should be used instead, but we
288 * should probably not touch it at all if it is
289 * already >0, because wMaxPacketSize of the audio
290 * endpoints seems to be the same for all.
291 */
292
293 dprintk("changing alternate number on interface %d to %d\n",
294 dev->ifnum, dev->alt);
295 usb_set_interface(dev->udev, dev->ifnum, dev->alt);
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 dev->adev.users++;
304 mutex_unlock(&dev->lock);
305 }
306
307 /* Dynamically adjust the period size */
308 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
309 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
310 dev->adev.period * 95 / 100,
311 dev->adev.period * 105 / 100);
312
313 dev->adev.capture_pcm_substream = substream;
314
315 return 0;
316 err:
317 mutex_unlock(&dev->lock);
318
319 em28xx_err("Error while configuring em28xx mixer\n");
320 return ret;
321 }
322
323 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
324 {
325 struct em28xx *dev = snd_pcm_substream_chip(substream);
326
327 dprintk("closing device\n");
328
329 dev->mute = 1;
330 mutex_lock(&dev->lock);
331 dev->adev.users--;
332 if (atomic_read(&dev->stream_started) > 0) {
333 atomic_set(&dev->stream_started, 0);
334 schedule_work(&dev->wq_trigger);
335 }
336
337 em28xx_audio_analog_set(dev);
338 if (substream->runtime->dma_area) {
339 dprintk("freeing\n");
340 vfree(substream->runtime->dma_area);
341 substream->runtime->dma_area = NULL;
342 }
343 mutex_unlock(&dev->lock);
344
345 return 0;
346 }
347
348 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
349 struct snd_pcm_hw_params *hw_params)
350 {
351 int ret;
352 struct em28xx *dev = snd_pcm_substream_chip(substream);
353
354 if (dev->disconnected)
355 return -ENODEV;
356
357 dprintk("Setting capture parameters\n");
358
359 ret = snd_pcm_alloc_vmalloc_buffer(substream,
360 params_buffer_bytes(hw_params));
361 if (ret < 0)
362 return ret;
363 #if 0
364 /* TODO: set up em28xx audio chip to deliver the correct audio format,
365 current default is 48000hz multiplexed => 96000hz mono
366 which shouldn't matter since analogue TV only supports mono */
367 unsigned int channels, rate, format;
368
369 format = params_format(hw_params);
370 rate = params_rate(hw_params);
371 channels = params_channels(hw_params);
372 #endif
373
374 return 0;
375 }
376
377 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
378 {
379 struct em28xx *dev = snd_pcm_substream_chip(substream);
380
381 dprintk("Stop capture, if needed\n");
382
383 if (atomic_read(&dev->stream_started) > 0) {
384 atomic_set(&dev->stream_started, 0);
385 schedule_work(&dev->wq_trigger);
386 }
387
388 return 0;
389 }
390
391 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
392 {
393 struct em28xx *dev = snd_pcm_substream_chip(substream);
394
395 if (dev->disconnected)
396 return -ENODEV;
397
398 dev->adev.hwptr_done_capture = 0;
399 dev->adev.capture_transfer_done = 0;
400
401 return 0;
402 }
403
404 static void audio_trigger(struct work_struct *work)
405 {
406 struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
407
408 if (atomic_read(&dev->stream_started)) {
409 dprintk("starting capture");
410 em28xx_init_audio_isoc(dev);
411 } else {
412 dprintk("stopping capture");
413 em28xx_deinit_isoc_audio(dev);
414 }
415 }
416
417 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
418 int cmd)
419 {
420 struct em28xx *dev = snd_pcm_substream_chip(substream);
421 int retval = 0;
422
423 if (dev->disconnected)
424 return -ENODEV;
425
426 switch (cmd) {
427 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
428 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
429 case SNDRV_PCM_TRIGGER_START:
430 atomic_set(&dev->stream_started, 1);
431 break;
432 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
433 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
434 case SNDRV_PCM_TRIGGER_STOP:
435 atomic_set(&dev->stream_started, 0);
436 break;
437 default:
438 retval = -EINVAL;
439 }
440 schedule_work(&dev->wq_trigger);
441 return retval;
442 }
443
444 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
445 *substream)
446 {
447 unsigned long flags;
448 struct em28xx *dev;
449 snd_pcm_uframes_t hwptr_done;
450
451 dev = snd_pcm_substream_chip(substream);
452 if (dev->disconnected)
453 return SNDRV_PCM_POS_XRUN;
454
455 spin_lock_irqsave(&dev->adev.slock, flags);
456 hwptr_done = dev->adev.hwptr_done_capture;
457 spin_unlock_irqrestore(&dev->adev.slock, flags);
458
459 return hwptr_done;
460 }
461
462 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
463 unsigned long offset)
464 {
465 void *pageptr = subs->runtime->dma_area + offset;
466
467 return vmalloc_to_page(pageptr);
468 }
469
470 /*
471 * AC97 volume control support
472 */
473 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
474 struct snd_ctl_elem_info *info)
475 {
476 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
477
478 if (dev->disconnected)
479 return -ENODEV;
480
481 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
482 info->count = 2;
483 info->value.integer.min = 0;
484 info->value.integer.max = 0x1f;
485
486 return 0;
487 }
488
489 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
490 struct snd_ctl_elem_value *value)
491 {
492 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
493 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
494 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
495 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
496 int nonblock = 0;
497 int rc;
498
499 if (dev->disconnected)
500 return -ENODEV;
501
502 if (substream)
503 nonblock = !!(substream->f_flags & O_NONBLOCK);
504 if (nonblock) {
505 if (!mutex_trylock(&dev->lock))
506 return -EAGAIN;
507 } else
508 mutex_lock(&dev->lock);
509 rc = em28xx_read_ac97(dev, kcontrol->private_value);
510 if (rc < 0)
511 goto err;
512
513 val |= rc & 0x8000; /* Preserve the mute flag */
514
515 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
516 if (rc < 0)
517 goto err;
518
519 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
520 (val & 0x8000) ? "muted " : "",
521 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
522 val, (int)kcontrol->private_value);
523
524 err:
525 mutex_unlock(&dev->lock);
526 return rc;
527 }
528
529 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
530 struct snd_ctl_elem_value *value)
531 {
532 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
533 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
534 int nonblock = 0;
535 int val;
536
537 if (dev->disconnected)
538 return -ENODEV;
539
540 if (substream)
541 nonblock = !!(substream->f_flags & O_NONBLOCK);
542 if (nonblock) {
543 if (!mutex_trylock(&dev->lock))
544 return -EAGAIN;
545 } else
546 mutex_lock(&dev->lock);
547 val = em28xx_read_ac97(dev, kcontrol->private_value);
548 mutex_unlock(&dev->lock);
549 if (val < 0)
550 return val;
551
552 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
553 (val & 0x8000) ? "muted " : "",
554 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
555 val, (int)kcontrol->private_value);
556
557 value->value.integer.value[0] = 0x1f - (val & 0x1f);
558 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
559
560 return 0;
561 }
562
563 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
564 struct snd_ctl_elem_value *value)
565 {
566 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
567 u16 val = value->value.integer.value[0];
568 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
569 int nonblock = 0;
570 int rc;
571
572 if (dev->disconnected)
573 return -ENODEV;
574
575 if (substream)
576 nonblock = !!(substream->f_flags & O_NONBLOCK);
577 if (nonblock) {
578 if (!mutex_trylock(&dev->lock))
579 return -EAGAIN;
580 } else
581 mutex_lock(&dev->lock);
582 rc = em28xx_read_ac97(dev, kcontrol->private_value);
583 if (rc < 0)
584 goto err;
585
586 if (val)
587 rc &= 0x1f1f;
588 else
589 rc |= 0x8000;
590
591 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
592 if (rc < 0)
593 goto err;
594
595 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
596 (val & 0x8000) ? "muted " : "",
597 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
598 val, (int)kcontrol->private_value);
599
600 err:
601 mutex_unlock(&dev->lock);
602 return rc;
603 }
604
605 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
606 struct snd_ctl_elem_value *value)
607 {
608 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
609 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
610 int nonblock = 0;
611 int val;
612
613 if (dev->disconnected)
614 return -ENODEV;
615
616 if (substream)
617 nonblock = !!(substream->f_flags & O_NONBLOCK);
618 if (nonblock) {
619 if (!mutex_trylock(&dev->lock))
620 return -EAGAIN;
621 } else
622 mutex_lock(&dev->lock);
623 val = em28xx_read_ac97(dev, kcontrol->private_value);
624 mutex_unlock(&dev->lock);
625 if (val < 0)
626 return val;
627
628 if (val & 0x8000)
629 value->value.integer.value[0] = 0;
630 else
631 value->value.integer.value[0] = 1;
632
633 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
634 (val & 0x8000) ? "muted " : "",
635 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
636 val, (int)kcontrol->private_value);
637
638 return 0;
639 }
640
641 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
642
643 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
644 char *name, int id)
645 {
646 int err;
647 char ctl_name[44];
648 struct snd_kcontrol *kctl;
649 struct snd_kcontrol_new tmp;
650
651 memset (&tmp, 0, sizeof(tmp));
652 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
653 tmp.private_value = id,
654 tmp.name = ctl_name,
655
656 /* Add Mute Control */
657 sprintf(ctl_name, "%s Switch", name);
658 tmp.get = em28xx_vol_get_mute;
659 tmp.put = em28xx_vol_put_mute;
660 tmp.info = snd_ctl_boolean_mono_info;
661 kctl = snd_ctl_new1(&tmp, dev);
662 err = snd_ctl_add(card, kctl);
663 if (err < 0)
664 return err;
665 dprintk("Added control %s for ac97 volume control 0x%04x\n",
666 ctl_name, id);
667
668 memset (&tmp, 0, sizeof(tmp));
669 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
670 tmp.private_value = id,
671 tmp.name = ctl_name,
672
673 /* Add Volume Control */
674 sprintf(ctl_name, "%s Volume", name);
675 tmp.get = em28xx_vol_get;
676 tmp.put = em28xx_vol_put;
677 tmp.info = em28xx_vol_info;
678 tmp.tlv.p = em28xx_db_scale,
679 kctl = snd_ctl_new1(&tmp, dev);
680 err = snd_ctl_add(card, kctl);
681 if (err < 0)
682 return err;
683 dprintk("Added control %s for ac97 volume control 0x%04x\n",
684 ctl_name, id);
685
686 return 0;
687 }
688
689 /*
690 * register/unregister code and data
691 */
692 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
693 .open = snd_em28xx_capture_open,
694 .close = snd_em28xx_pcm_close,
695 .ioctl = snd_pcm_lib_ioctl,
696 .hw_params = snd_em28xx_hw_capture_params,
697 .hw_free = snd_em28xx_hw_capture_free,
698 .prepare = snd_em28xx_prepare,
699 .trigger = snd_em28xx_capture_trigger,
700 .pointer = snd_em28xx_capture_pointer,
701 .page = snd_pcm_get_vmalloc_page,
702 };
703
704 static void em28xx_audio_free_urb(struct em28xx *dev)
705 {
706 int i;
707
708 for (i = 0; i < dev->adev.num_urb; i++) {
709 struct urb *urb = dev->adev.urb[i];
710
711 if (!urb)
712 continue;
713
714 usb_free_coherent(dev->udev, urb->transfer_buffer_length,
715 dev->adev.transfer_buffer[i],
716 urb->transfer_dma);
717
718 usb_free_urb(urb);
719 }
720 kfree(dev->adev.urb);
721 kfree(dev->adev.transfer_buffer);
722 dev->adev.num_urb = 0;
723 }
724
725 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
726 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
727 struct usb_endpoint_descriptor *e)
728 {
729 int size = le16_to_cpu(e->wMaxPacketSize);
730
731 if (udev->speed == USB_SPEED_HIGH)
732 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
733
734 return size & 0x7ff;
735 }
736
737 static int em28xx_audio_urb_init(struct em28xx *dev)
738 {
739 struct usb_interface *intf;
740 struct usb_endpoint_descriptor *e, *ep = NULL;
741 int i, ep_size, interval, num_urb, npackets;
742 int urb_size, bytes_per_transfer;
743 u8 alt;
744
745 if (dev->ifnum)
746 alt = 1;
747 else
748 alt = 7;
749
750 intf = usb_ifnum_to_if(dev->udev, dev->ifnum);
751
752 if (intf->num_altsetting <= alt) {
753 em28xx_errdev("alt %d doesn't exist on interface %d\n",
754 dev->ifnum, alt);
755 return -ENODEV;
756 }
757
758 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
759 e = &intf->altsetting[alt].endpoint[i].desc;
760 if (!usb_endpoint_dir_in(e))
761 continue;
762 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
763 ep = e;
764 break;
765 }
766 }
767
768 if (!ep) {
769 em28xx_errdev("Couldn't find an audio endpoint");
770 return -ENODEV;
771 }
772
773 ep_size = em28xx_audio_ep_packet_size(dev->udev, ep);
774 interval = 1 << (ep->bInterval - 1);
775
776 em28xx_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
777 EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed),
778 dev->ifnum, alt,
779 interval,
780 ep_size);
781
782 /* Calculate the number and size of URBs to better fit the audio samples */
783
784 /*
785 * Estimate the number of bytes per DMA transfer.
786 *
787 * This is given by the bit rate (for now, only 48000 Hz) multiplied
788 * by 2 channels and 2 bytes/sample divided by the number of microframe
789 * intervals and by the microframe rate (125 us)
790 */
791 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
792
793 /*
794 * Estimate the number of transfer URBs. Don't let it go past the
795 * maximum number of URBs that is known to be supported by the device.
796 */
797 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
798 if (num_urb > EM28XX_MAX_AUDIO_BUFS)
799 num_urb = EM28XX_MAX_AUDIO_BUFS;
800
801 /*
802 * Now that we know the number of bytes per transfer and the number of
803 * URBs, estimate the typical size of an URB, in order to adjust the
804 * minimal number of packets.
805 */
806 urb_size = bytes_per_transfer / num_urb;
807
808 /*
809 * Now, calculate the amount of audio packets to be filled on each
810 * URB. In order to preserve the old behaviour, use a minimal
811 * threshold for this value.
812 */
813 npackets = EM28XX_MIN_AUDIO_PACKETS;
814 if (urb_size > ep_size * npackets)
815 npackets = DIV_ROUND_UP(urb_size, ep_size);
816
817 em28xx_info("Number of URBs: %d, with %d packets and %d size",
818 num_urb, npackets, urb_size);
819
820 /* Estimate the bytes per period */
821 dev->adev.period = urb_size * npackets;
822
823 /* Allocate space to store the number of URBs to be used */
824
825 dev->adev.transfer_buffer = kcalloc(num_urb,
826 sizeof(*dev->adev.transfer_buffer),
827 GFP_ATOMIC);
828 if (!dev->adev.transfer_buffer) {
829 return -ENOMEM;
830 }
831
832 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
833 if (!dev->adev.urb) {
834 kfree(dev->adev.transfer_buffer);
835 return -ENOMEM;
836 }
837
838 /* Alloc memory for each URB and for each transfer buffer */
839 dev->adev.num_urb = num_urb;
840 for (i = 0; i < num_urb; i++) {
841 struct urb *urb;
842 int j, k;
843 void *buf;
844
845 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
846 if (!urb) {
847 em28xx_errdev("usb_alloc_urb failed!\n");
848 em28xx_audio_free_urb(dev);
849 return -ENOMEM;
850 }
851 dev->adev.urb[i] = urb;
852
853 buf = usb_alloc_coherent(dev->udev, npackets * ep_size, GFP_ATOMIC,
854 &urb->transfer_dma);
855 if (!buf) {
856 em28xx_errdev("usb_alloc_coherent failed!\n");
857 em28xx_audio_free_urb(dev);
858 return -ENOMEM;
859 }
860 dev->adev.transfer_buffer[i] = buf;
861
862 urb->dev = dev->udev;
863 urb->context = dev;
864 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO);
865 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
866 urb->transfer_buffer = buf;
867 urb->interval = interval;
868 urb->complete = em28xx_audio_isocirq;
869 urb->number_of_packets = npackets;
870 urb->transfer_buffer_length = ep_size * npackets;
871
872 for (j = k = 0; j < npackets; j++, k += ep_size) {
873 urb->iso_frame_desc[j].offset = k;
874 urb->iso_frame_desc[j].length = ep_size;
875 }
876 }
877
878 return 0;
879 }
880
881 static int em28xx_audio_init(struct em28xx *dev)
882 {
883 struct em28xx_audio *adev = &dev->adev;
884 struct snd_pcm *pcm;
885 struct snd_card *card;
886 static int devnr;
887 int err;
888
889 if (!dev->has_alsa_audio) {
890 /* This device does not support the extension (in this case
891 the device is expecting the snd-usb-audio module or
892 doesn't have analog audio support at all) */
893 return 0;
894 }
895
896 em28xx_info("Binding audio extension\n");
897
898 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
899 "Rechberger\n");
900 printk(KERN_INFO
901 "em28xx-audio.c: Copyright (C) 2007-2014 Mauro Carvalho Chehab\n");
902
903 err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
904 &card);
905 if (err < 0)
906 return err;
907
908 spin_lock_init(&adev->slock);
909 adev->sndcard = card;
910 adev->udev = dev->udev;
911
912 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
913 if (err < 0)
914 goto card_free;
915
916 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
917 pcm->info_flags = 0;
918 pcm->private_data = dev;
919 strcpy(pcm->name, "Empia 28xx Capture");
920
921 snd_card_set_dev(card, &dev->udev->dev);
922 strcpy(card->driver, "Em28xx-Audio");
923 strcpy(card->shortname, "Em28xx Audio");
924 strcpy(card->longname, "Empia Em28xx Audio");
925
926 INIT_WORK(&dev->wq_trigger, audio_trigger);
927
928 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
929 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
930 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
931 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
932 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
933 em28xx_cvol_new(card, dev, "CD", AC97_CD);
934 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
935 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
936
937 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
938 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
939 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
940 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
941 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
942 }
943
944 err = em28xx_audio_urb_init(dev);
945 if (err)
946 goto card_free;
947
948 err = snd_card_register(card);
949 if (err < 0)
950 goto urb_free;
951
952 em28xx_info("Audio extension successfully initialized\n");
953 return 0;
954
955 urb_free:
956 em28xx_audio_free_urb(dev);
957
958 card_free:
959 snd_card_free(card);
960 adev->sndcard = NULL;
961
962 return err;
963 }
964
965 static int em28xx_audio_fini(struct em28xx *dev)
966 {
967 if (dev == NULL)
968 return 0;
969
970 if (dev->has_alsa_audio != 1) {
971 /* This device does not support the extension (in this case
972 the device is expecting the snd-usb-audio module or
973 doesn't have analog audio support at all) */
974 return 0;
975 }
976
977 em28xx_info("Closing audio extension");
978
979 if (dev->adev.sndcard) {
980 snd_card_disconnect(dev->adev.sndcard);
981 flush_work(&dev->wq_trigger);
982
983 em28xx_audio_free_urb(dev);
984
985 snd_card_free(dev->adev.sndcard);
986 dev->adev.sndcard = NULL;
987 }
988
989 return 0;
990 }
991
992 static struct em28xx_ops audio_ops = {
993 .id = EM28XX_AUDIO,
994 .name = "Em28xx Audio Extension",
995 .init = em28xx_audio_init,
996 .fini = em28xx_audio_fini,
997 };
998
999 static int __init em28xx_alsa_register(void)
1000 {
1001 return em28xx_register_extension(&audio_ops);
1002 }
1003
1004 static void __exit em28xx_alsa_unregister(void)
1005 {
1006 em28xx_unregister_extension(&audio_ops);
1007 }
1008
1009 MODULE_LICENSE("GPL");
1010 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1011 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
1012 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1013 MODULE_VERSION(EM28XX_VERSION);
1014
1015 module_init(em28xx_alsa_register);
1016 module_exit(em28xx_alsa_unregister);
Linux with added FPC-III support