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[media] em28xx: fix usb alternate setting for analog and digital video endpoints > 0
[deliverable/linux.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) 2007-2014 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 }
170 return;
171 }
172
173 static int em28xx_init_audio_isoc(struct em28xx *dev)
174 {
175 int i, errCode;
176
177 dprintk("Starting isoc transfers\n");
178
179 /* Start streaming */
180 for (i = 0; i < dev->adev.num_urb; i++) {
181 memset(dev->adev.transfer_buffer[i], 0x80,
182 dev->adev.urb[i]->transfer_buffer_length);
183
184 errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
185 if (errCode) {
186 em28xx_errdev("submit of audio urb failed\n");
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->ifnum) && 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->ifnum)
278 dev->alt = 1;
279 else
280 dev->alt = 7;
281
282 dprintk("changing alternate number on interface %d to %d\n",
283 dev->ifnum, dev->alt);
284 usb_set_interface(dev->udev, dev->ifnum, dev->alt);
285
286 /* Sets volume, mute, etc */
287 dev->mute = 0;
288 ret = em28xx_audio_analog_set(dev);
289 if (ret < 0)
290 goto err;
291
292 dev->adev.users++;
293 mutex_unlock(&dev->lock);
294 }
295
296 /* Dynamically adjust the period size */
297 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
298 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
299 dev->adev.period * 95 / 100,
300 dev->adev.period * 105 / 100);
301
302 dev->adev.capture_pcm_substream = substream;
303
304 return 0;
305 err:
306 mutex_unlock(&dev->lock);
307
308 em28xx_err("Error while configuring em28xx mixer\n");
309 return ret;
310 }
311
312 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
313 {
314 struct em28xx *dev = snd_pcm_substream_chip(substream);
315
316 dprintk("closing device\n");
317
318 dev->mute = 1;
319 mutex_lock(&dev->lock);
320 dev->adev.users--;
321 if (atomic_read(&dev->stream_started) > 0) {
322 atomic_set(&dev->stream_started, 0);
323 schedule_work(&dev->wq_trigger);
324 }
325
326 em28xx_audio_analog_set(dev);
327 if (substream->runtime->dma_area) {
328 dprintk("freeing\n");
329 vfree(substream->runtime->dma_area);
330 substream->runtime->dma_area = NULL;
331 }
332 mutex_unlock(&dev->lock);
333
334 return 0;
335 }
336
337 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params *hw_params)
339 {
340 int ret;
341 struct em28xx *dev = snd_pcm_substream_chip(substream);
342
343 if (dev->disconnected)
344 return -ENODEV;
345
346 dprintk("Setting capture parameters\n");
347
348 ret = snd_pcm_alloc_vmalloc_buffer(substream,
349 params_buffer_bytes(hw_params));
350 if (ret < 0)
351 return ret;
352 #if 0
353 /* TODO: set up em28xx audio chip to deliver the correct audio format,
354 current default is 48000hz multiplexed => 96000hz mono
355 which shouldn't matter since analogue TV only supports mono */
356 unsigned int channels, rate, format;
357
358 format = params_format(hw_params);
359 rate = params_rate(hw_params);
360 channels = params_channels(hw_params);
361 #endif
362
363 return 0;
364 }
365
366 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
367 {
368 struct em28xx *dev = snd_pcm_substream_chip(substream);
369
370 dprintk("Stop capture, if needed\n");
371
372 if (atomic_read(&dev->stream_started) > 0) {
373 atomic_set(&dev->stream_started, 0);
374 schedule_work(&dev->wq_trigger);
375 }
376
377 return 0;
378 }
379
380 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
381 {
382 struct em28xx *dev = snd_pcm_substream_chip(substream);
383
384 if (dev->disconnected)
385 return -ENODEV;
386
387 dev->adev.hwptr_done_capture = 0;
388 dev->adev.capture_transfer_done = 0;
389
390 return 0;
391 }
392
393 static void audio_trigger(struct work_struct *work)
394 {
395 struct em28xx *dev = container_of(work, struct em28xx, wq_trigger);
396
397 if (atomic_read(&dev->stream_started)) {
398 dprintk("starting capture");
399 em28xx_init_audio_isoc(dev);
400 } else {
401 dprintk("stopping capture");
402 em28xx_deinit_isoc_audio(dev);
403 }
404 }
405
406 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
407 int cmd)
408 {
409 struct em28xx *dev = snd_pcm_substream_chip(substream);
410 int retval = 0;
411
412 if (dev->disconnected)
413 return -ENODEV;
414
415 switch (cmd) {
416 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
417 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
418 case SNDRV_PCM_TRIGGER_START:
419 atomic_set(&dev->stream_started, 1);
420 break;
421 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
422 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
423 case SNDRV_PCM_TRIGGER_STOP:
424 atomic_set(&dev->stream_started, 0);
425 break;
426 default:
427 retval = -EINVAL;
428 }
429 schedule_work(&dev->wq_trigger);
430 return retval;
431 }
432
433 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
434 *substream)
435 {
436 unsigned long flags;
437 struct em28xx *dev;
438 snd_pcm_uframes_t hwptr_done;
439
440 dev = snd_pcm_substream_chip(substream);
441 if (dev->disconnected)
442 return SNDRV_PCM_POS_XRUN;
443
444 spin_lock_irqsave(&dev->adev.slock, flags);
445 hwptr_done = dev->adev.hwptr_done_capture;
446 spin_unlock_irqrestore(&dev->adev.slock, flags);
447
448 return hwptr_done;
449 }
450
451 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
452 unsigned long offset)
453 {
454 void *pageptr = subs->runtime->dma_area + offset;
455
456 return vmalloc_to_page(pageptr);
457 }
458
459 /*
460 * AC97 volume control support
461 */
462 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
463 struct snd_ctl_elem_info *info)
464 {
465 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
466
467 if (dev->disconnected)
468 return -ENODEV;
469
470 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
471 info->count = 2;
472 info->value.integer.min = 0;
473 info->value.integer.max = 0x1f;
474
475 return 0;
476 }
477
478 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
479 struct snd_ctl_elem_value *value)
480 {
481 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
482 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
483 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
484 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
485 int nonblock = 0;
486 int rc;
487
488 if (dev->disconnected)
489 return -ENODEV;
490
491 if (substream)
492 nonblock = !!(substream->f_flags & O_NONBLOCK);
493 if (nonblock) {
494 if (!mutex_trylock(&dev->lock))
495 return -EAGAIN;
496 } else
497 mutex_lock(&dev->lock);
498 rc = em28xx_read_ac97(dev, kcontrol->private_value);
499 if (rc < 0)
500 goto err;
501
502 val |= rc & 0x8000; /* Preserve the mute flag */
503
504 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
505 if (rc < 0)
506 goto err;
507
508 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
509 (val & 0x8000) ? "muted " : "",
510 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
511 val, (int)kcontrol->private_value);
512
513 err:
514 mutex_unlock(&dev->lock);
515 return rc;
516 }
517
518 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
519 struct snd_ctl_elem_value *value)
520 {
521 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
522 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
523 int nonblock = 0;
524 int val;
525
526 if (dev->disconnected)
527 return -ENODEV;
528
529 if (substream)
530 nonblock = !!(substream->f_flags & O_NONBLOCK);
531 if (nonblock) {
532 if (!mutex_trylock(&dev->lock))
533 return -EAGAIN;
534 } else
535 mutex_lock(&dev->lock);
536 val = em28xx_read_ac97(dev, kcontrol->private_value);
537 mutex_unlock(&dev->lock);
538 if (val < 0)
539 return val;
540
541 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
542 (val & 0x8000) ? "muted " : "",
543 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
544 val, (int)kcontrol->private_value);
545
546 value->value.integer.value[0] = 0x1f - (val & 0x1f);
547 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
548
549 return 0;
550 }
551
552 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
553 struct snd_ctl_elem_value *value)
554 {
555 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
556 u16 val = value->value.integer.value[0];
557 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
558 int nonblock = 0;
559 int rc;
560
561 if (dev->disconnected)
562 return -ENODEV;
563
564 if (substream)
565 nonblock = !!(substream->f_flags & O_NONBLOCK);
566 if (nonblock) {
567 if (!mutex_trylock(&dev->lock))
568 return -EAGAIN;
569 } else
570 mutex_lock(&dev->lock);
571 rc = em28xx_read_ac97(dev, kcontrol->private_value);
572 if (rc < 0)
573 goto err;
574
575 if (val)
576 rc &= 0x1f1f;
577 else
578 rc |= 0x8000;
579
580 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
581 if (rc < 0)
582 goto err;
583
584 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
585 (val & 0x8000) ? "muted " : "",
586 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
587 val, (int)kcontrol->private_value);
588
589 err:
590 mutex_unlock(&dev->lock);
591 return rc;
592 }
593
594 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
595 struct snd_ctl_elem_value *value)
596 {
597 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
598 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
599 int nonblock = 0;
600 int val;
601
602 if (dev->disconnected)
603 return -ENODEV;
604
605 if (substream)
606 nonblock = !!(substream->f_flags & O_NONBLOCK);
607 if (nonblock) {
608 if (!mutex_trylock(&dev->lock))
609 return -EAGAIN;
610 } else
611 mutex_lock(&dev->lock);
612 val = em28xx_read_ac97(dev, kcontrol->private_value);
613 mutex_unlock(&dev->lock);
614 if (val < 0)
615 return val;
616
617 if (val & 0x8000)
618 value->value.integer.value[0] = 0;
619 else
620 value->value.integer.value[0] = 1;
621
622 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
623 (val & 0x8000) ? "muted " : "",
624 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
625 val, (int)kcontrol->private_value);
626
627 return 0;
628 }
629
630 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
631
632 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
633 char *name, int id)
634 {
635 int err;
636 char ctl_name[44];
637 struct snd_kcontrol *kctl;
638 struct snd_kcontrol_new tmp;
639
640 memset (&tmp, 0, sizeof(tmp));
641 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
642 tmp.private_value = id,
643 tmp.name = ctl_name,
644
645 /* Add Mute Control */
646 sprintf(ctl_name, "%s Switch", name);
647 tmp.get = em28xx_vol_get_mute;
648 tmp.put = em28xx_vol_put_mute;
649 tmp.info = snd_ctl_boolean_mono_info;
650 kctl = snd_ctl_new1(&tmp, dev);
651 err = snd_ctl_add(card, kctl);
652 if (err < 0)
653 return err;
654 dprintk("Added control %s for ac97 volume control 0x%04x\n",
655 ctl_name, id);
656
657 memset (&tmp, 0, sizeof(tmp));
658 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
659 tmp.private_value = id,
660 tmp.name = ctl_name,
661
662 /* Add Volume Control */
663 sprintf(ctl_name, "%s Volume", name);
664 tmp.get = em28xx_vol_get;
665 tmp.put = em28xx_vol_put;
666 tmp.info = em28xx_vol_info;
667 tmp.tlv.p = em28xx_db_scale,
668 kctl = snd_ctl_new1(&tmp, dev);
669 err = snd_ctl_add(card, kctl);
670 if (err < 0)
671 return err;
672 dprintk("Added control %s for ac97 volume control 0x%04x\n",
673 ctl_name, id);
674
675 return 0;
676 }
677
678 /*
679 * register/unregister code and data
680 */
681 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
682 .open = snd_em28xx_capture_open,
683 .close = snd_em28xx_pcm_close,
684 .ioctl = snd_pcm_lib_ioctl,
685 .hw_params = snd_em28xx_hw_capture_params,
686 .hw_free = snd_em28xx_hw_capture_free,
687 .prepare = snd_em28xx_prepare,
688 .trigger = snd_em28xx_capture_trigger,
689 .pointer = snd_em28xx_capture_pointer,
690 .page = snd_pcm_get_vmalloc_page,
691 };
692
693 static void em28xx_audio_free_urb(struct em28xx *dev)
694 {
695 int i;
696
697 for (i = 0; i < dev->adev.num_urb; i++) {
698 struct urb *urb = dev->adev.urb[i];
699
700 if (!urb)
701 continue;
702
703 if (dev->adev.transfer_buffer[i])
704 usb_free_coherent(dev->udev,
705 urb->transfer_buffer_length,
706 dev->adev.transfer_buffer[i],
707 urb->transfer_dma);
708
709 usb_free_urb(urb);
710 }
711 kfree(dev->adev.urb);
712 kfree(dev->adev.transfer_buffer);
713 dev->adev.num_urb = 0;
714 }
715
716 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
717 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
718 struct usb_endpoint_descriptor *e)
719 {
720 int size = le16_to_cpu(e->wMaxPacketSize);
721
722 if (udev->speed == USB_SPEED_HIGH)
723 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
724
725 return size & 0x7ff;
726 }
727
728 static int em28xx_audio_urb_init(struct em28xx *dev)
729 {
730 struct usb_interface *intf;
731 struct usb_endpoint_descriptor *e, *ep = NULL;
732 int i, ep_size, interval, num_urb, npackets;
733 int urb_size, bytes_per_transfer;
734 u8 alt;
735
736 if (dev->ifnum)
737 alt = 1;
738 else
739 alt = 7;
740
741 intf = usb_ifnum_to_if(dev->udev, dev->ifnum);
742
743 if (intf->num_altsetting <= alt) {
744 em28xx_errdev("alt %d doesn't exist on interface %d\n",
745 dev->ifnum, alt);
746 return -ENODEV;
747 }
748
749 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
750 e = &intf->altsetting[alt].endpoint[i].desc;
751 if (!usb_endpoint_dir_in(e))
752 continue;
753 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
754 ep = e;
755 break;
756 }
757 }
758
759 if (!ep) {
760 em28xx_errdev("Couldn't find an audio endpoint");
761 return -ENODEV;
762 }
763
764 ep_size = em28xx_audio_ep_packet_size(dev->udev, ep);
765 interval = 1 << (ep->bInterval - 1);
766
767 em28xx_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
768 EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed),
769 dev->ifnum, alt,
770 interval,
771 ep_size);
772
773 /* Calculate the number and size of URBs to better fit the audio samples */
774
775 /*
776 * Estimate the number of bytes per DMA transfer.
777 *
778 * This is given by the bit rate (for now, only 48000 Hz) multiplied
779 * by 2 channels and 2 bytes/sample divided by the number of microframe
780 * intervals and by the microframe rate (125 us)
781 */
782 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
783
784 /*
785 * Estimate the number of transfer URBs. Don't let it go past the
786 * maximum number of URBs that is known to be supported by the device.
787 */
788 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
789 if (num_urb > EM28XX_MAX_AUDIO_BUFS)
790 num_urb = EM28XX_MAX_AUDIO_BUFS;
791
792 /*
793 * Now that we know the number of bytes per transfer and the number of
794 * URBs, estimate the typical size of an URB, in order to adjust the
795 * minimal number of packets.
796 */
797 urb_size = bytes_per_transfer / num_urb;
798
799 /*
800 * Now, calculate the amount of audio packets to be filled on each
801 * URB. In order to preserve the old behaviour, use a minimal
802 * threshold for this value.
803 */
804 npackets = EM28XX_MIN_AUDIO_PACKETS;
805 if (urb_size > ep_size * npackets)
806 npackets = DIV_ROUND_UP(urb_size, ep_size);
807
808 em28xx_info("Number of URBs: %d, with %d packets and %d size",
809 num_urb, npackets, urb_size);
810
811 /* Estimate the bytes per period */
812 dev->adev.period = urb_size * npackets;
813
814 /* Allocate space to store the number of URBs to be used */
815
816 dev->adev.transfer_buffer = kcalloc(num_urb,
817 sizeof(*dev->adev.transfer_buffer),
818 GFP_ATOMIC);
819 if (!dev->adev.transfer_buffer) {
820 return -ENOMEM;
821 }
822
823 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
824 if (!dev->adev.urb) {
825 kfree(dev->adev.transfer_buffer);
826 return -ENOMEM;
827 }
828
829 /* Alloc memory for each URB and for each transfer buffer */
830 dev->adev.num_urb = num_urb;
831 for (i = 0; i < num_urb; i++) {
832 struct urb *urb;
833 int j, k;
834 void *buf;
835
836 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
837 if (!urb) {
838 em28xx_errdev("usb_alloc_urb failed!\n");
839 em28xx_audio_free_urb(dev);
840 return -ENOMEM;
841 }
842 dev->adev.urb[i] = urb;
843
844 buf = usb_alloc_coherent(dev->udev, npackets * ep_size, GFP_ATOMIC,
845 &urb->transfer_dma);
846 if (!buf) {
847 em28xx_errdev("usb_alloc_coherent failed!\n");
848 em28xx_audio_free_urb(dev);
849 return -ENOMEM;
850 }
851 dev->adev.transfer_buffer[i] = buf;
852
853 urb->dev = dev->udev;
854 urb->context = dev;
855 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO);
856 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
857 urb->transfer_buffer = buf;
858 urb->interval = interval;
859 urb->complete = em28xx_audio_isocirq;
860 urb->number_of_packets = npackets;
861 urb->transfer_buffer_length = ep_size * npackets;
862
863 for (j = k = 0; j < npackets; j++, k += ep_size) {
864 urb->iso_frame_desc[j].offset = k;
865 urb->iso_frame_desc[j].length = ep_size;
866 }
867 }
868
869 return 0;
870 }
871
872 static int em28xx_audio_init(struct em28xx *dev)
873 {
874 struct em28xx_audio *adev = &dev->adev;
875 struct snd_pcm *pcm;
876 struct snd_card *card;
877 static int devnr;
878 int err;
879
880 if (!dev->has_alsa_audio) {
881 /* This device does not support the extension (in this case
882 the device is expecting the snd-usb-audio module or
883 doesn't have analog audio support at all) */
884 return 0;
885 }
886
887 em28xx_info("Binding audio extension\n");
888
889 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
890 "Rechberger\n");
891 printk(KERN_INFO
892 "em28xx-audio.c: Copyright (C) 2007-2014 Mauro Carvalho Chehab\n");
893
894 err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0,
895 &card);
896 if (err < 0)
897 return err;
898
899 spin_lock_init(&adev->slock);
900 adev->sndcard = card;
901 adev->udev = dev->udev;
902
903 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
904 if (err < 0)
905 goto card_free;
906
907 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
908 pcm->info_flags = 0;
909 pcm->private_data = dev;
910 strcpy(pcm->name, "Empia 28xx Capture");
911
912 snd_card_set_dev(card, &dev->udev->dev);
913 strcpy(card->driver, "Em28xx-Audio");
914 strcpy(card->shortname, "Em28xx Audio");
915 strcpy(card->longname, "Empia Em28xx Audio");
916
917 INIT_WORK(&dev->wq_trigger, audio_trigger);
918
919 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
920 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
921 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
922 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
923 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
924 em28xx_cvol_new(card, dev, "CD", AC97_CD);
925 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
926 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
927
928 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
929 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
930 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
931 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
932 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
933 }
934
935 err = em28xx_audio_urb_init(dev);
936 if (err)
937 goto card_free;
938
939 err = snd_card_register(card);
940 if (err < 0)
941 goto urb_free;
942
943 em28xx_info("Audio extension successfully initialized\n");
944 return 0;
945
946 urb_free:
947 em28xx_audio_free_urb(dev);
948
949 card_free:
950 snd_card_free(card);
951 adev->sndcard = NULL;
952
953 return err;
954 }
955
956 static int em28xx_audio_fini(struct em28xx *dev)
957 {
958 if (dev == NULL)
959 return 0;
960
961 if (dev->has_alsa_audio != 1) {
962 /* This device does not support the extension (in this case
963 the device is expecting the snd-usb-audio module or
964 doesn't have analog audio support at all) */
965 return 0;
966 }
967
968 em28xx_info("Closing audio extension");
969
970 if (dev->adev.sndcard) {
971 snd_card_disconnect(dev->adev.sndcard);
972 flush_work(&dev->wq_trigger);
973
974 em28xx_audio_free_urb(dev);
975
976 snd_card_free(dev->adev.sndcard);
977 dev->adev.sndcard = NULL;
978 }
979
980 return 0;
981 }
982
983 static struct em28xx_ops audio_ops = {
984 .id = EM28XX_AUDIO,
985 .name = "Em28xx Audio Extension",
986 .init = em28xx_audio_init,
987 .fini = em28xx_audio_fini,
988 };
989
990 static int __init em28xx_alsa_register(void)
991 {
992 return em28xx_register_extension(&audio_ops);
993 }
994
995 static void __exit em28xx_alsa_unregister(void)
996 {
997 em28xx_unregister_extension(&audio_ops);
998 }
999
1000 MODULE_LICENSE("GPL");
1001 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1002 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
1003 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1004 MODULE_VERSION(EM28XX_VERSION);
1005
1006 module_init(em28xx_alsa_register);
1007 module_exit(em28xx_alsa_unregister);
Linux kernel - Deliverables
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