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irqchip/s3c24xx: Mark init_eint as __maybe_unused
[linux/fpc-iii.git] / drivers / media / usb / em28xx / em28xx-audio.c
blob49a5f9532bd8d863e0b63d73b8216e532cae2b05
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->adev.stream_started, 0);
96 return;
97 }
98
99 switch (urb->status) {
100 case 0: /* success */
101 case -ETIMEDOUT: /* NAK */
102 break;
103 case -ECONNRESET: /* kill */
104 case -ENOENT:
105 case -ESHUTDOWN:
106 return;
107 default: /* error */
108 dprintk("urb completition error %d.\n", urb->status);
109 break;
110 }
111
112 if (atomic_read(&dev->adev.stream_started) == 0)
113 return;
114
115 if (dev->adev.capture_pcm_substream) {
116 substream = dev->adev.capture_pcm_substream;
117 runtime = substream->runtime;
118 stride = runtime->frame_bits >> 3;
119
120 for (i = 0; i < urb->number_of_packets; i++) {
121 int length =
122 urb->iso_frame_desc[i].actual_length / stride;
123 cp = (unsigned char *)urb->transfer_buffer +
124 urb->iso_frame_desc[i].offset;
125
126 if (!length)
127 continue;
128
129 oldptr = dev->adev.hwptr_done_capture;
130 if (oldptr + length >= runtime->buffer_size) {
131 unsigned int cnt =
132 runtime->buffer_size - oldptr;
133 memcpy(runtime->dma_area + oldptr * stride, cp,
134 cnt * stride);
135 memcpy(runtime->dma_area, cp + cnt * stride,
136 length * stride - cnt * stride);
137 } else {
138 memcpy(runtime->dma_area + oldptr * stride, cp,
139 length * stride);
140 }
141
142 snd_pcm_stream_lock(substream);
143
144 dev->adev.hwptr_done_capture += length;
145 if (dev->adev.hwptr_done_capture >=
146 runtime->buffer_size)
147 dev->adev.hwptr_done_capture -=
148 runtime->buffer_size;
149
150 dev->adev.capture_transfer_done += length;
151 if (dev->adev.capture_transfer_done >=
152 runtime->period_size) {
153 dev->adev.capture_transfer_done -=
154 runtime->period_size;
155 period_elapsed = 1;
156 }
157
158 snd_pcm_stream_unlock(substream);
159 }
160 if (period_elapsed)
161 snd_pcm_period_elapsed(substream);
162 }
163 urb->status = 0;
164
165 status = usb_submit_urb(urb, GFP_ATOMIC);
166 if (status < 0)
167 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->adev.stream_started, 0);
189 return errCode;
190 }
191
192 }
193
194 return 0;
195 }
196
197 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
198 size_t size)
199 {
200 struct snd_pcm_runtime *runtime = subs->runtime;
201
202 dprintk("Allocating vbuffer\n");
203 if (runtime->dma_area) {
204 if (runtime->dma_bytes > size)
205 return 0;
206
207 vfree(runtime->dma_area);
208 }
209 runtime->dma_area = vmalloc(size);
210 if (!runtime->dma_area)
211 return -ENOMEM;
212
213 runtime->dma_bytes = size;
214
215 return 0;
216 }
217
218 static struct snd_pcm_hardware snd_em28xx_hw_capture = {
219 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
220 SNDRV_PCM_INFO_MMAP |
221 SNDRV_PCM_INFO_INTERLEAVED |
222 SNDRV_PCM_INFO_BATCH |
223 SNDRV_PCM_INFO_MMAP_VALID,
224
225 .formats = SNDRV_PCM_FMTBIT_S16_LE,
226
227 .rates = SNDRV_PCM_RATE_48000,
228
229 .rate_min = 48000,
230 .rate_max = 48000,
231 .channels_min = 2,
232 .channels_max = 2,
233 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
234
235 /*
236 * The period is 12.288 bytes. Allow a 10% of variation along its
237 * value, in order to avoid overruns/underruns due to some clock
238 * drift.
239 *
240 * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
241 * Calculate it dynamically.
242 */
243 .period_bytes_min = 11059,
244 .period_bytes_max = 13516,
245
246 .periods_min = 2,
247 .periods_max = 98, /* 12544, */
248 };
249
250 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
251 {
252 struct em28xx *dev = snd_pcm_substream_chip(substream);
253 struct snd_pcm_runtime *runtime = substream->runtime;
254 int nonblock, ret = 0;
255
256 if (!dev) {
257 em28xx_err("BUG: em28xx can't find device struct."
258 " 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 if (dev->is_audio_only)
279 /* audio is on a separate interface */
280 dev->alt = 1;
281 else
282 /* audio is on the same interface as video */
283 dev->alt = 7;
284 /*
285 * FIXME: The intention seems to be to select
286 * the alt setting with the largest
287 * wMaxPacketSize for the video endpoint.
288 * At least dev->alt should be used instead, but
289 * we should probably not touch it at all if it
290 * is already >0, because wMaxPacketSize of the
291 * audio endpoints seems to be the same for all.
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
298 /* Sets volume, mute, etc */
299 dev->mute = 0;
300 ret = em28xx_audio_analog_set(dev);
301 if (ret < 0)
302 goto err;
303 }
304
305 kref_get(&dev->ref);
306 dev->adev.users++;
307 mutex_unlock(&dev->lock);
308
309 /* Dynamically adjust the period size */
310 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
311 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
312 dev->adev.period * 95 / 100,
313 dev->adev.period * 105 / 100);
314
315 dev->adev.capture_pcm_substream = substream;
316
317 return 0;
318 err:
319 mutex_unlock(&dev->lock);
320
321 em28xx_err("Error while configuring em28xx mixer\n");
322 return ret;
323 }
324
325 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
326 {
327 struct em28xx *dev = snd_pcm_substream_chip(substream);
328
329 dprintk("closing device\n");
330
331 dev->mute = 1;
332 mutex_lock(&dev->lock);
333 dev->adev.users--;
334 if (atomic_read(&dev->adev.stream_started) > 0) {
335 atomic_set(&dev->adev.stream_started, 0);
336 schedule_work(&dev->adev.wq_trigger);
337 }
338
339 em28xx_audio_analog_set(dev);
340 if (substream->runtime->dma_area) {
341 dprintk("freeing\n");
342 vfree(substream->runtime->dma_area);
343 substream->runtime->dma_area = NULL;
344 }
345 mutex_unlock(&dev->lock);
346 kref_put(&dev->ref, em28xx_free_device);
347
348 return 0;
349 }
350
351 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
352 struct snd_pcm_hw_params *hw_params)
353 {
354 int ret;
355 struct em28xx *dev = snd_pcm_substream_chip(substream);
356
357 if (dev->disconnected)
358 return -ENODEV;
359
360 dprintk("Setting capture parameters\n");
361
362 ret = snd_pcm_alloc_vmalloc_buffer(substream,
363 params_buffer_bytes(hw_params));
364 if (ret < 0)
365 return ret;
366 #if 0
367 /* TODO: set up em28xx audio chip to deliver the correct audio format,
368 current default is 48000hz multiplexed => 96000hz mono
369 which shouldn't matter since analogue TV only supports mono */
370 unsigned int channels, rate, format;
371
372 format = params_format(hw_params);
373 rate = params_rate(hw_params);
374 channels = params_channels(hw_params);
375 #endif
376
377 return 0;
378 }
379
380 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
381 {
382 struct em28xx *dev = snd_pcm_substream_chip(substream);
383 struct em28xx_audio *adev = &dev->adev;
384
385 dprintk("Stop capture, if needed\n");
386
387 if (atomic_read(&adev->stream_started) > 0) {
388 atomic_set(&adev->stream_started, 0);
389 schedule_work(&adev->wq_trigger);
390 }
391
392 return 0;
393 }
394
395 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
396 {
397 struct em28xx *dev = snd_pcm_substream_chip(substream);
398
399 if (dev->disconnected)
400 return -ENODEV;
401
402 dev->adev.hwptr_done_capture = 0;
403 dev->adev.capture_transfer_done = 0;
404
405 return 0;
406 }
407
408 static void audio_trigger(struct work_struct *work)
409 {
410 struct em28xx_audio *adev =
411 container_of(work, struct em28xx_audio, wq_trigger);
412 struct em28xx *dev = container_of(adev, struct em28xx, adev);
413
414 if (atomic_read(&adev->stream_started)) {
415 dprintk("starting capture");
416 em28xx_init_audio_isoc(dev);
417 } else {
418 dprintk("stopping capture");
419 em28xx_deinit_isoc_audio(dev);
420 }
421 }
422
423 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
424 int cmd)
425 {
426 struct em28xx *dev = snd_pcm_substream_chip(substream);
427 int retval = 0;
428
429 if (dev->disconnected)
430 return -ENODEV;
431
432 switch (cmd) {
433 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
434 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
435 case SNDRV_PCM_TRIGGER_START:
436 atomic_set(&dev->adev.stream_started, 1);
437 break;
438 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
439 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
440 case SNDRV_PCM_TRIGGER_STOP:
441 atomic_set(&dev->adev.stream_started, 0);
442 break;
443 default:
444 retval = -EINVAL;
445 }
446 schedule_work(&dev->adev.wq_trigger);
447 return retval;
448 }
449
450 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
451 *substream)
452 {
453 unsigned long flags;
454 struct em28xx *dev;
455 snd_pcm_uframes_t hwptr_done;
456
457 dev = snd_pcm_substream_chip(substream);
458 if (dev->disconnected)
459 return SNDRV_PCM_POS_XRUN;
460
461 spin_lock_irqsave(&dev->adev.slock, flags);
462 hwptr_done = dev->adev.hwptr_done_capture;
463 spin_unlock_irqrestore(&dev->adev.slock, flags);
464
465 return hwptr_done;
466 }
467
468 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
469 unsigned long offset)
470 {
471 void *pageptr = subs->runtime->dma_area + offset;
472
473 return vmalloc_to_page(pageptr);
474 }
475
476 /*
477 * AC97 volume control support
478 */
479 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
480 struct snd_ctl_elem_info *info)
481 {
482 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
483
484 if (dev->disconnected)
485 return -ENODEV;
486
487 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
488 info->count = 2;
489 info->value.integer.min = 0;
490 info->value.integer.max = 0x1f;
491
492 return 0;
493 }
494
495 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
496 struct snd_ctl_elem_value *value)
497 {
498 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
499 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
500 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
501 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
502 int nonblock = 0;
503 int rc;
504
505 if (dev->disconnected)
506 return -ENODEV;
507
508 if (substream)
509 nonblock = !!(substream->f_flags & O_NONBLOCK);
510 if (nonblock) {
511 if (!mutex_trylock(&dev->lock))
512 return -EAGAIN;
513 } else
514 mutex_lock(&dev->lock);
515 rc = em28xx_read_ac97(dev, kcontrol->private_value);
516 if (rc < 0)
517 goto err;
518
519 val |= rc & 0x8000; /* Preserve the mute flag */
520
521 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
522 if (rc < 0)
523 goto err;
524
525 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
526 (val & 0x8000) ? "muted " : "",
527 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
528 val, (int)kcontrol->private_value);
529
530 err:
531 mutex_unlock(&dev->lock);
532 return rc;
533 }
534
535 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
536 struct snd_ctl_elem_value *value)
537 {
538 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
539 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
540 int nonblock = 0;
541 int val;
542
543 if (dev->disconnected)
544 return -ENODEV;
545
546 if (substream)
547 nonblock = !!(substream->f_flags & O_NONBLOCK);
548 if (nonblock) {
549 if (!mutex_trylock(&dev->lock))
550 return -EAGAIN;
551 } else
552 mutex_lock(&dev->lock);
553 val = em28xx_read_ac97(dev, kcontrol->private_value);
554 mutex_unlock(&dev->lock);
555 if (val < 0)
556 return val;
557
558 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
559 (val & 0x8000) ? "muted " : "",
560 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
561 val, (int)kcontrol->private_value);
562
563 value->value.integer.value[0] = 0x1f - (val & 0x1f);
564 value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f);
565
566 return 0;
567 }
568
569 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
570 struct snd_ctl_elem_value *value)
571 {
572 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
573 u16 val = value->value.integer.value[0];
574 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
575 int nonblock = 0;
576 int rc;
577
578 if (dev->disconnected)
579 return -ENODEV;
580
581 if (substream)
582 nonblock = !!(substream->f_flags & O_NONBLOCK);
583 if (nonblock) {
584 if (!mutex_trylock(&dev->lock))
585 return -EAGAIN;
586 } else
587 mutex_lock(&dev->lock);
588 rc = em28xx_read_ac97(dev, kcontrol->private_value);
589 if (rc < 0)
590 goto err;
591
592 if (val)
593 rc &= 0x1f1f;
594 else
595 rc |= 0x8000;
596
597 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
598 if (rc < 0)
599 goto err;
600
601 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
602 (val & 0x8000) ? "muted " : "",
603 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
604 val, (int)kcontrol->private_value);
605
606 err:
607 mutex_unlock(&dev->lock);
608 return rc;
609 }
610
611 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
612 struct snd_ctl_elem_value *value)
613 {
614 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
615 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
616 int nonblock = 0;
617 int val;
618
619 if (dev->disconnected)
620 return -ENODEV;
621
622 if (substream)
623 nonblock = !!(substream->f_flags & O_NONBLOCK);
624 if (nonblock) {
625 if (!mutex_trylock(&dev->lock))
626 return -EAGAIN;
627 } else
628 mutex_lock(&dev->lock);
629 val = em28xx_read_ac97(dev, kcontrol->private_value);
630 mutex_unlock(&dev->lock);
631 if (val < 0)
632 return val;
633
634 if (val & 0x8000)
635 value->value.integer.value[0] = 0;
636 else
637 value->value.integer.value[0] = 1;
638
639 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
640 (val & 0x8000) ? "muted " : "",
641 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
642 val, (int)kcontrol->private_value);
643
644 return 0;
645 }
646
647 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
648
649 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
650 char *name, int id)
651 {
652 int err;
653 char ctl_name[44];
654 struct snd_kcontrol *kctl;
655 struct snd_kcontrol_new tmp;
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 Mute Control */
663 sprintf(ctl_name, "%s Switch", name);
664 tmp.get = em28xx_vol_get_mute;
665 tmp.put = em28xx_vol_put_mute;
666 tmp.info = snd_ctl_boolean_mono_info;
667 kctl = snd_ctl_new1(&tmp, dev);
668 err = snd_ctl_add(card, kctl);
669 if (err < 0)
670 return err;
671 dprintk("Added control %s for ac97 volume control 0x%04x\n",
672 ctl_name, id);
673
674 memset(&tmp, 0, sizeof(tmp));
675 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
676 tmp.private_value = id,
677 tmp.name = ctl_name,
678
679 /* Add Volume Control */
680 sprintf(ctl_name, "%s Volume", name);
681 tmp.get = em28xx_vol_get;
682 tmp.put = em28xx_vol_put;
683 tmp.info = em28xx_vol_info;
684 tmp.tlv.p = em28xx_db_scale,
685 kctl = snd_ctl_new1(&tmp, dev);
686 err = snd_ctl_add(card, kctl);
687 if (err < 0)
688 return err;
689 dprintk("Added control %s for ac97 volume control 0x%04x\n",
690 ctl_name, id);
691
692 return 0;
693 }
694
695 /*
696 * register/unregister code and data
697 */
698 static struct snd_pcm_ops snd_em28xx_pcm_capture = {
699 .open = snd_em28xx_capture_open,
700 .close = snd_em28xx_pcm_close,
701 .ioctl = snd_pcm_lib_ioctl,
702 .hw_params = snd_em28xx_hw_capture_params,
703 .hw_free = snd_em28xx_hw_capture_free,
704 .prepare = snd_em28xx_prepare,
705 .trigger = snd_em28xx_capture_trigger,
706 .pointer = snd_em28xx_capture_pointer,
707 .page = snd_pcm_get_vmalloc_page,
708 };
709
710 static void em28xx_audio_free_urb(struct em28xx *dev)
711 {
712 int i;
713
714 for (i = 0; i < dev->adev.num_urb; i++) {
715 struct urb *urb = dev->adev.urb[i];
716
717 if (!urb)
718 continue;
719
720 usb_free_coherent(dev->udev, urb->transfer_buffer_length,
721 dev->adev.transfer_buffer[i],
722 urb->transfer_dma);
723
724 usb_free_urb(urb);
725 }
726 kfree(dev->adev.urb);
727 kfree(dev->adev.transfer_buffer);
728 dev->adev.num_urb = 0;
729 }
730
731 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
732 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
733 struct usb_endpoint_descriptor *e)
734 {
735 int size = le16_to_cpu(e->wMaxPacketSize);
736
737 if (udev->speed == USB_SPEED_HIGH)
738 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
739
740 return size & 0x7ff;
741 }
742
743 static int em28xx_audio_urb_init(struct em28xx *dev)
744 {
745 struct usb_interface *intf;
746 struct usb_endpoint_descriptor *e, *ep = NULL;
747 int i, ep_size, interval, num_urb, npackets;
748 int urb_size, bytes_per_transfer;
749 u8 alt;
750
751 if (dev->ifnum)
752 alt = 1;
753 else
754 alt = 7;
755
756 intf = usb_ifnum_to_if(dev->udev, dev->ifnum);
757
758 if (intf->num_altsetting <= alt) {
759 em28xx_errdev("alt %d doesn't exist on interface %d\n",
760 dev->ifnum, alt);
761 return -ENODEV;
762 }
763
764 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
765 e = &intf->altsetting[alt].endpoint[i].desc;
766 if (!usb_endpoint_dir_in(e))
767 continue;
768 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
769 ep = e;
770 break;
771 }
772 }
773
774 if (!ep) {
775 em28xx_errdev("Couldn't find an audio endpoint");
776 return -ENODEV;
777 }
778
779 ep_size = em28xx_audio_ep_packet_size(dev->udev, ep);
780 interval = 1 << (ep->bInterval - 1);
781
782 em28xx_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
783 EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed),
784 dev->ifnum, alt,
785 interval,
786 ep_size);
787
788 /* Calculate the number and size of URBs to better fit the audio samples */
789
790 /*
791 * Estimate the number of bytes per DMA transfer.
792 *
793 * This is given by the bit rate (for now, only 48000 Hz) multiplied
794 * by 2 channels and 2 bytes/sample divided by the number of microframe
795 * intervals and by the microframe rate (125 us)
796 */
797 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
798
799 /*
800 * Estimate the number of transfer URBs. Don't let it go past the
801 * maximum number of URBs that is known to be supported by the device.
802 */
803 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
804 if (num_urb > EM28XX_MAX_AUDIO_BUFS)
805 num_urb = EM28XX_MAX_AUDIO_BUFS;
806
807 /*
808 * Now that we know the number of bytes per transfer and the number of
809 * URBs, estimate the typical size of an URB, in order to adjust the
810 * minimal number of packets.
811 */
812 urb_size = bytes_per_transfer / num_urb;
813
814 /*
815 * Now, calculate the amount of audio packets to be filled on each
816 * URB. In order to preserve the old behaviour, use a minimal
817 * threshold for this value.
818 */
819 npackets = EM28XX_MIN_AUDIO_PACKETS;
820 if (urb_size > ep_size * npackets)
821 npackets = DIV_ROUND_UP(urb_size, ep_size);
822
823 em28xx_info("Number of URBs: %d, with %d packets and %d size\n",
824 num_urb, npackets, urb_size);
825
826 /* Estimate the bytes per period */
827 dev->adev.period = urb_size * npackets;
828
829 /* Allocate space to store the number of URBs to be used */
830
831 dev->adev.transfer_buffer = kcalloc(num_urb,
832 sizeof(*dev->adev.transfer_buffer),
833 GFP_ATOMIC);
834 if (!dev->adev.transfer_buffer) {
835 return -ENOMEM;
836 }
837
838 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
839 if (!dev->adev.urb) {
840 kfree(dev->adev.transfer_buffer);
841 return -ENOMEM;
842 }
843
844 /* Alloc memory for each URB and for each transfer buffer */
845 dev->adev.num_urb = num_urb;
846 for (i = 0; i < num_urb; i++) {
847 struct urb *urb;
848 int j, k;
849 void *buf;
850
851 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
852 if (!urb) {
853 em28xx_errdev("usb_alloc_urb failed!\n");
854 em28xx_audio_free_urb(dev);
855 return -ENOMEM;
856 }
857 dev->adev.urb[i] = urb;
858
859 buf = usb_alloc_coherent(dev->udev, npackets * ep_size, GFP_ATOMIC,
860 &urb->transfer_dma);
861 if (!buf) {
862 em28xx_errdev("usb_alloc_coherent failed!\n");
863 em28xx_audio_free_urb(dev);
864 return -ENOMEM;
865 }
866 dev->adev.transfer_buffer[i] = buf;
867
868 urb->dev = dev->udev;
869 urb->context = dev;
870 urb->pipe = usb_rcvisocpipe(dev->udev, EM28XX_EP_AUDIO);
871 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
872 urb->transfer_buffer = buf;
873 urb->interval = interval;
874 urb->complete = em28xx_audio_isocirq;
875 urb->number_of_packets = npackets;
876 urb->transfer_buffer_length = ep_size * npackets;
877
878 for (j = k = 0; j < npackets; j++, k += ep_size) {
879 urb->iso_frame_desc[j].offset = k;
880 urb->iso_frame_desc[j].length = ep_size;
881 }
882 }
883
884 return 0;
885 }
886
887 static int em28xx_audio_init(struct em28xx *dev)
888 {
889 struct em28xx_audio *adev = &dev->adev;
890 struct snd_pcm *pcm;
891 struct snd_card *card;
892 static int devnr;
893 int err;
894
895 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
896 /* This device does not support the extension (in this case
897 the device is expecting the snd-usb-audio module or
898 doesn't have analog audio support at all) */
899 return 0;
900 }
901
902 em28xx_info("Binding audio extension\n");
903
904 kref_get(&dev->ref);
905
906 printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus "
907 "Rechberger\n");
908 printk(KERN_INFO
909 "em28xx-audio.c: Copyright (C) 2007-2014 Mauro Carvalho Chehab\n");
910
911 err = snd_card_new(&dev->udev->dev, index[devnr], "Em28xx Audio",
912 THIS_MODULE, 0, &card);
913 if (err < 0)
914 return err;
915
916 spin_lock_init(&adev->slock);
917 adev->sndcard = card;
918 adev->udev = dev->udev;
919
920 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
921 if (err < 0)
922 goto card_free;
923
924 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
925 pcm->info_flags = 0;
926 pcm->private_data = dev;
927 strcpy(pcm->name, "Empia 28xx Capture");
928
929 strcpy(card->driver, "Em28xx-Audio");
930 strcpy(card->shortname, "Em28xx Audio");
931 strcpy(card->longname, "Empia Em28xx Audio");
932
933 INIT_WORK(&adev->wq_trigger, audio_trigger);
934
935 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
936 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
937 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
938 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
939 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
940 em28xx_cvol_new(card, dev, "CD", AC97_CD);
941 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
942 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
943
944 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
945 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
946 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
947 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
948 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
949 }
950
951 err = em28xx_audio_urb_init(dev);
952 if (err)
953 goto card_free;
954
955 err = snd_card_register(card);
956 if (err < 0)
957 goto urb_free;
958
959 em28xx_info("Audio extension successfully initialized\n");
960 return 0;
961
962 urb_free:
963 em28xx_audio_free_urb(dev);
964
965 card_free:
966 snd_card_free(card);
967 adev->sndcard = NULL;
968
969 return err;
970 }
971
972 static int em28xx_audio_fini(struct em28xx *dev)
973 {
974 if (dev == NULL)
975 return 0;
976
977 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
978 /* This device does not support the extension (in this case
979 the device is expecting the snd-usb-audio module or
980 doesn't have analog audio support at all) */
981 return 0;
982 }
983
984 em28xx_info("Closing audio extension\n");
985
986 if (dev->adev.sndcard) {
987 snd_card_disconnect(dev->adev.sndcard);
988 flush_work(&dev->adev.wq_trigger);
989
990 em28xx_audio_free_urb(dev);
991
992 snd_card_free(dev->adev.sndcard);
993 dev->adev.sndcard = NULL;
994 }
995
996 kref_put(&dev->ref, em28xx_free_device);
997 return 0;
998 }
999
1000 static int em28xx_audio_suspend(struct em28xx *dev)
1001 {
1002 if (dev == NULL)
1003 return 0;
1004
1005 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1006 return 0;
1007
1008 em28xx_info("Suspending audio extension\n");
1009 em28xx_deinit_isoc_audio(dev);
1010 atomic_set(&dev->adev.stream_started, 0);
1011 return 0;
1012 }
1013
1014 static int em28xx_audio_resume(struct em28xx *dev)
1015 {
1016 if (dev == NULL)
1017 return 0;
1018
1019 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1020 return 0;
1021
1022 em28xx_info("Resuming audio extension\n");
1023 /* Nothing to do other than schedule_work() ?? */
1024 schedule_work(&dev->adev.wq_trigger);
1025 return 0;
1026 }
1027
1028 static struct em28xx_ops audio_ops = {
1029 .id = EM28XX_AUDIO,
1030 .name = "Em28xx Audio Extension",
1031 .init = em28xx_audio_init,
1032 .fini = em28xx_audio_fini,
1033 .suspend = em28xx_audio_suspend,
1034 .resume = em28xx_audio_resume,
1035 };
1036
1037 static int __init em28xx_alsa_register(void)
1038 {
1039 return em28xx_register_extension(&audio_ops);
1040 }
1041
1042 static void __exit em28xx_alsa_unregister(void)
1043 {
1044 em28xx_unregister_extension(&audio_ops);
1045 }
1046
1047 MODULE_LICENSE("GPL");
1048 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1049 MODULE_AUTHOR("Mauro Carvalho Chehab");
1050 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1051 MODULE_VERSION(EM28XX_VERSION);
1052
1053 module_init(em28xx_alsa_register);
1054 module_exit(em28xx_alsa_unregister);
Linux with added FPC-III support