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interconnect: qcom: Fix Kconfig indentation
[linux/fpc-iii.git] / drivers / media / usb / em28xx / em28xx-audio.c
blob79dfbb25714bf21d284a278b1aa67ee7562a5576
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // Empiatech em28x1 audio extension
4 //
5 // Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com>
6 //
7 // Copyright (C) 2007-2016 Mauro Carvalho Chehab
8 // - Port to work with the in-kernel driver
9 // - Cleanups, fixes, alsa-controls, etc.
10 //
11 // This driver is based on my previous au600 usb pstn audio driver
12 // and inherits all the copyrights
13 //
14 // This program is free software; you can redistribute it and/or modify
15 // it under the terms of the GNU General Public License as published by
16 // the Free Software Foundation; either version 2 of the License, or
17 // (at your option) any later version.
18 //
19 // This program is distributed in the hope that it will be useful,
20 // but WITHOUT ANY WARRANTY; without even the implied warranty of
21 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 // GNU General Public License for more details.
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/module.h>
35 #include <sound/core.h>
36 #include <sound/pcm.h>
37 #include <sound/pcm_params.h>
38 #include <sound/info.h>
39 #include <sound/initval.h>
40 #include <sound/control.h>
41 #include <sound/tlv.h>
42 #include <sound/ac97_codec.h>
43 #include <media/v4l2-common.h>
44
45 static int debug;
46 module_param(debug, int, 0644);
47 MODULE_PARM_DESC(debug, "activates debug info");
48
49 #define EM28XX_MAX_AUDIO_BUFS 5
50 #define EM28XX_MIN_AUDIO_PACKETS 64
51
52 #define dprintk(fmt, arg...) do { \
53 if (debug) \
54 dev_printk(KERN_DEBUG, &dev->intf->dev, \
55 "video: %s: " fmt, __func__, ## arg); \
56 } while (0)
57
58 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
59
60 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
61 {
62 int i;
63
64 dprintk("Stopping isoc\n");
65 for (i = 0; i < dev->adev.num_urb; i++) {
66 struct urb *urb = dev->adev.urb[i];
67
68 if (!irqs_disabled())
69 usb_kill_urb(urb);
70 else
71 usb_unlink_urb(urb);
72 }
73
74 return 0;
75 }
76
77 static void em28xx_audio_isocirq(struct urb *urb)
78 {
79 struct em28xx *dev = urb->context;
80 int i;
81 unsigned int oldptr;
82 int period_elapsed = 0;
83 int status;
84 unsigned char *cp;
85 unsigned int stride;
86 struct snd_pcm_substream *substream;
87 struct snd_pcm_runtime *runtime;
88
89 if (dev->disconnected) {
90 dprintk("device disconnected while streaming. URB status=%d.\n",
91 urb->status);
92 atomic_set(&dev->adev.stream_started, 0);
93 return;
94 }
95
96 switch (urb->status) {
97 case 0: /* success */
98 case -ETIMEDOUT: /* NAK */
99 break;
100 case -ECONNRESET: /* kill */
101 case -ENOENT:
102 case -ESHUTDOWN:
103 return;
104 default: /* error */
105 dprintk("urb completion error %d.\n", urb->status);
106 break;
107 }
108
109 if (atomic_read(&dev->adev.stream_started) == 0)
110 return;
111
112 if (dev->adev.capture_pcm_substream) {
113 substream = dev->adev.capture_pcm_substream;
114 runtime = substream->runtime;
115 stride = runtime->frame_bits >> 3;
116
117 for (i = 0; i < urb->number_of_packets; i++) {
118 unsigned long flags;
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_irqsave(substream, flags);
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_irqrestore(substream, flags);
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 }
169
170 static int em28xx_init_audio_isoc(struct em28xx *dev)
171 {
172 int i, err;
173
174 dprintk("Starting isoc transfers\n");
175
176 /* Start streaming */
177 for (i = 0; i < dev->adev.num_urb; i++) {
178 memset(dev->adev.transfer_buffer[i], 0x80,
179 dev->adev.urb[i]->transfer_buffer_length);
180
181 err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
182 if (err) {
183 dev_err(&dev->intf->dev,
184 "submit of audio urb failed (error=%i)\n",
185 err);
186 em28xx_deinit_isoc_audio(dev);
187 atomic_set(&dev->adev.stream_started, 0);
188 return err;
189 }
190 }
191
192 return 0;
193 }
194
195 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
196 size_t size)
197 {
198 struct em28xx *dev = snd_pcm_substream_chip(subs);
199 struct snd_pcm_runtime *runtime = subs->runtime;
200
201 dprintk("Allocating vbuffer\n");
202 if (runtime->dma_area) {
203 if (runtime->dma_bytes > size)
204 return 0;
205
206 vfree(runtime->dma_area);
207 }
208 runtime->dma_area = vmalloc(size);
209 if (!runtime->dma_area)
210 return -ENOMEM;
211
212 runtime->dma_bytes = size;
213
214 return 0;
215 }
216
217 static const struct snd_pcm_hardware snd_em28xx_hw_capture = {
218 .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
219 SNDRV_PCM_INFO_MMAP |
220 SNDRV_PCM_INFO_INTERLEAVED |
221 SNDRV_PCM_INFO_BATCH |
222 SNDRV_PCM_INFO_MMAP_VALID,
223
224 .formats = SNDRV_PCM_FMTBIT_S16_LE,
225
226 .rates = SNDRV_PCM_RATE_48000,
227
228 .rate_min = 48000,
229 .rate_max = 48000,
230 .channels_min = 2,
231 .channels_max = 2,
232 .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
233
234 /*
235 * The period is 12.288 bytes. Allow a 10% of variation along its
236 * value, in order to avoid overruns/underruns due to some clock
237 * drift.
238 *
239 * FIXME: This period assumes 64 packets, and a 48000 PCM rate.
240 * Calculate it dynamically.
241 */
242 .period_bytes_min = 11059,
243 .period_bytes_max = 13516,
244
245 .periods_min = 2,
246 .periods_max = 98, /* 12544, */
247 };
248
249 static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
250 {
251 struct em28xx *dev = snd_pcm_substream_chip(substream);
252 struct snd_pcm_runtime *runtime = substream->runtime;
253 int nonblock, ret = 0;
254
255 if (!dev) {
256 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
257 return -ENODEV;
258 }
259
260 if (dev->disconnected)
261 return -ENODEV;
262
263 dprintk("opening device and trying to acquire exclusive lock\n");
264
265 nonblock = !!(substream->f_flags & O_NONBLOCK);
266 if (nonblock) {
267 if (!mutex_trylock(&dev->lock))
268 return -EAGAIN;
269 } else {
270 mutex_lock(&dev->lock);
271 }
272
273 runtime->hw = snd_em28xx_hw_capture;
274
275 if (dev->adev.users == 0) {
276 if (!dev->alt || dev->is_audio_only) {
277 struct usb_device *udev;
278
279 udev = interface_to_usbdev(dev->intf);
280
281 if (dev->is_audio_only)
282 /* audio is on a separate interface */
283 dev->alt = 1;
284 else
285 /* audio is on the same interface as video */
286 dev->alt = 7;
287 /*
288 * FIXME: The intention seems to be to select
289 * the alt setting with the largest
290 * wMaxPacketSize for the video endpoint.
291 * At least dev->alt should be used instead, but
292 * we should probably not touch it at all if it
293 * is already >0, because wMaxPacketSize of the
294 * audio endpoints seems to be the same for all.
295 */
296 dprintk("changing alternate number on interface %d to %d\n",
297 dev->ifnum, dev->alt);
298 usb_set_interface(udev, dev->ifnum, dev->alt);
299 }
300
301 /* Sets volume, mute, etc */
302 dev->mute = 0;
303 ret = em28xx_audio_analog_set(dev);
304 if (ret < 0)
305 goto err;
306 }
307
308 kref_get(&dev->ref);
309 dev->adev.users++;
310 mutex_unlock(&dev->lock);
311
312 /* Dynamically adjust the period size */
313 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
314 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
315 dev->adev.period * 95 / 100,
316 dev->adev.period * 105 / 100);
317
318 dev->adev.capture_pcm_substream = substream;
319
320 return 0;
321 err:
322 mutex_unlock(&dev->lock);
323
324 dev_err(&dev->intf->dev,
325 "Error while configuring em28xx mixer\n");
326 return ret;
327 }
328
329 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
330 {
331 struct em28xx *dev = snd_pcm_substream_chip(substream);
332
333 dprintk("closing device\n");
334
335 dev->mute = 1;
336 mutex_lock(&dev->lock);
337 dev->adev.users--;
338 if (atomic_read(&dev->adev.stream_started) > 0) {
339 atomic_set(&dev->adev.stream_started, 0);
340 schedule_work(&dev->adev.wq_trigger);
341 }
342
343 em28xx_audio_analog_set(dev);
344 if (substream->runtime->dma_area) {
345 dprintk("freeing\n");
346 vfree(substream->runtime->dma_area);
347 substream->runtime->dma_area = NULL;
348 }
349 mutex_unlock(&dev->lock);
350 kref_put(&dev->ref, em28xx_free_device);
351
352 return 0;
353 }
354
355 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
356 struct snd_pcm_hw_params *hw_params)
357 {
358 int ret;
359 struct em28xx *dev = snd_pcm_substream_chip(substream);
360
361 if (dev->disconnected)
362 return -ENODEV;
363
364 dprintk("Setting capture parameters\n");
365
366 ret = snd_pcm_alloc_vmalloc_buffer(substream,
367 params_buffer_bytes(hw_params));
368 if (ret < 0)
369 return ret;
370 #if 0
371 /*
372 * TODO: set up em28xx audio chip to deliver the correct audio format,
373 * current default is 48000hz multiplexed => 96000hz mono
374 * which shouldn't matter since analogue TV only supports mono
375 */
376 unsigned int channels, rate, format;
377
378 format = params_format(hw_params);
379 rate = params_rate(hw_params);
380 channels = params_channels(hw_params);
381 #endif
382
383 return 0;
384 }
385
386 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
387 {
388 struct em28xx *dev = snd_pcm_substream_chip(substream);
389 struct em28xx_audio *adev = &dev->adev;
390
391 dprintk("Stop capture, if needed\n");
392
393 if (atomic_read(&adev->stream_started) > 0) {
394 atomic_set(&adev->stream_started, 0);
395 schedule_work(&adev->wq_trigger);
396 }
397
398 return 0;
399 }
400
401 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
402 {
403 struct em28xx *dev = snd_pcm_substream_chip(substream);
404
405 if (dev->disconnected)
406 return -ENODEV;
407
408 dev->adev.hwptr_done_capture = 0;
409 dev->adev.capture_transfer_done = 0;
410
411 return 0;
412 }
413
414 static void audio_trigger(struct work_struct *work)
415 {
416 struct em28xx_audio *adev =
417 container_of(work, struct em28xx_audio, wq_trigger);
418 struct em28xx *dev = container_of(adev, struct em28xx, adev);
419
420 if (atomic_read(&adev->stream_started)) {
421 dprintk("starting capture");
422 em28xx_init_audio_isoc(dev);
423 } else {
424 dprintk("stopping capture");
425 em28xx_deinit_isoc_audio(dev);
426 }
427 }
428
429 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
430 int cmd)
431 {
432 struct em28xx *dev = snd_pcm_substream_chip(substream);
433 int retval = 0;
434
435 if (dev->disconnected)
436 return -ENODEV;
437
438 switch (cmd) {
439 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
440 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
441 case SNDRV_PCM_TRIGGER_START:
442 atomic_set(&dev->adev.stream_started, 1);
443 break;
444 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
445 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
446 case SNDRV_PCM_TRIGGER_STOP:
447 atomic_set(&dev->adev.stream_started, 0);
448 break;
449 default:
450 retval = -EINVAL;
451 }
452 schedule_work(&dev->adev.wq_trigger);
453 return retval;
454 }
455
456 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
457 *substream)
458 {
459 unsigned long flags;
460 struct em28xx *dev;
461 snd_pcm_uframes_t hwptr_done;
462
463 dev = snd_pcm_substream_chip(substream);
464 if (dev->disconnected)
465 return SNDRV_PCM_POS_XRUN;
466
467 spin_lock_irqsave(&dev->adev.slock, flags);
468 hwptr_done = dev->adev.hwptr_done_capture;
469 spin_unlock_irqrestore(&dev->adev.slock, flags);
470
471 return hwptr_done;
472 }
473
474 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
475 unsigned long offset)
476 {
477 void *pageptr = subs->runtime->dma_area + offset;
478
479 return vmalloc_to_page(pageptr);
480 }
481
482 /*
483 * AC97 volume control support
484 */
485 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
486 struct snd_ctl_elem_info *info)
487 {
488 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
489
490 if (dev->disconnected)
491 return -ENODEV;
492
493 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
494 info->count = 2;
495 info->value.integer.min = 0;
496 info->value.integer.max = 0x1f;
497
498 return 0;
499 }
500
501 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
502 struct snd_ctl_elem_value *value)
503 {
504 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
505 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
506 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
507 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
508 int nonblock = 0;
509 int rc;
510
511 if (dev->disconnected)
512 return -ENODEV;
513
514 if (substream)
515 nonblock = !!(substream->f_flags & O_NONBLOCK);
516 if (nonblock) {
517 if (!mutex_trylock(&dev->lock))
518 return -EAGAIN;
519 } else {
520 mutex_lock(&dev->lock);
521 }
522 rc = em28xx_read_ac97(dev, kcontrol->private_value);
523 if (rc < 0)
524 goto err;
525
526 val |= rc & 0x8000; /* Preserve the mute flag */
527
528 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
529 if (rc < 0)
530 goto err;
531
532 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
533 (val & 0x8000) ? "muted " : "",
534 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
535 val, (int)kcontrol->private_value);
536
537 err:
538 mutex_unlock(&dev->lock);
539 return rc;
540 }
541
542 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
543 struct snd_ctl_elem_value *value)
544 {
545 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
546 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
547 int nonblock = 0;
548 int val;
549
550 if (dev->disconnected)
551 return -ENODEV;
552
553 if (substream)
554 nonblock = !!(substream->f_flags & O_NONBLOCK);
555 if (nonblock) {
556 if (!mutex_trylock(&dev->lock))
557 return -EAGAIN;
558 } else {
559 mutex_lock(&dev->lock);
560 }
561 val = em28xx_read_ac97(dev, kcontrol->private_value);
562 mutex_unlock(&dev->lock);
563 if (val < 0)
564 return val;
565
566 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
567 (val & 0x8000) ? "muted " : "",
568 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
569 val, (int)kcontrol->private_value);
570
571 value->value.integer.value[0] = 0x1f - (val & 0x1f);
572 value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);
573
574 return 0;
575 }
576
577 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
578 struct snd_ctl_elem_value *value)
579 {
580 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
581 u16 val = value->value.integer.value[0];
582 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
583 int nonblock = 0;
584 int rc;
585
586 if (dev->disconnected)
587 return -ENODEV;
588
589 if (substream)
590 nonblock = !!(substream->f_flags & O_NONBLOCK);
591 if (nonblock) {
592 if (!mutex_trylock(&dev->lock))
593 return -EAGAIN;
594 } else {
595 mutex_lock(&dev->lock);
596 }
597 rc = em28xx_read_ac97(dev, kcontrol->private_value);
598 if (rc < 0)
599 goto err;
600
601 if (val)
602 rc &= 0x1f1f;
603 else
604 rc |= 0x8000;
605
606 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
607 if (rc < 0)
608 goto err;
609
610 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
611 (val & 0x8000) ? "muted " : "",
612 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
613 val, (int)kcontrol->private_value);
614
615 err:
616 mutex_unlock(&dev->lock);
617 return rc;
618 }
619
620 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
621 struct snd_ctl_elem_value *value)
622 {
623 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
624 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
625 int nonblock = 0;
626 int val;
627
628 if (dev->disconnected)
629 return -ENODEV;
630
631 if (substream)
632 nonblock = !!(substream->f_flags & O_NONBLOCK);
633 if (nonblock) {
634 if (!mutex_trylock(&dev->lock))
635 return -EAGAIN;
636 } else {
637 mutex_lock(&dev->lock);
638 }
639 val = em28xx_read_ac97(dev, kcontrol->private_value);
640 mutex_unlock(&dev->lock);
641 if (val < 0)
642 return val;
643
644 if (val & 0x8000)
645 value->value.integer.value[0] = 0;
646 else
647 value->value.integer.value[0] = 1;
648
649 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
650 (val & 0x8000) ? "muted " : "",
651 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
652 val, (int)kcontrol->private_value);
653
654 return 0;
655 }
656
657 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
658
659 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
660 char *name, int id)
661 {
662 int err;
663 char ctl_name[44];
664 struct snd_kcontrol *kctl;
665 struct snd_kcontrol_new tmp;
666
667 memset(&tmp, 0, sizeof(tmp));
668 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
669 tmp.private_value = id,
670 tmp.name = ctl_name,
671
672 /* Add Mute Control */
673 sprintf(ctl_name, "%s Switch", name);
674 tmp.get = em28xx_vol_get_mute;
675 tmp.put = em28xx_vol_put_mute;
676 tmp.info = snd_ctl_boolean_mono_info;
677 kctl = snd_ctl_new1(&tmp, dev);
678 err = snd_ctl_add(card, kctl);
679 if (err < 0)
680 return err;
681 dprintk("Added control %s for ac97 volume control 0x%04x\n",
682 ctl_name, id);
683
684 memset(&tmp, 0, sizeof(tmp));
685 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
686 tmp.private_value = id,
687 tmp.name = ctl_name,
688
689 /* Add Volume Control */
690 sprintf(ctl_name, "%s Volume", name);
691 tmp.get = em28xx_vol_get;
692 tmp.put = em28xx_vol_put;
693 tmp.info = em28xx_vol_info;
694 tmp.tlv.p = em28xx_db_scale,
695 kctl = snd_ctl_new1(&tmp, dev);
696 err = snd_ctl_add(card, kctl);
697 if (err < 0)
698 return err;
699 dprintk("Added control %s for ac97 volume control 0x%04x\n",
700 ctl_name, id);
701
702 return 0;
703 }
704
705 /*
706 * register/unregister code and data
707 */
708 static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
709 .open = snd_em28xx_capture_open,
710 .close = snd_em28xx_pcm_close,
711 .ioctl = snd_pcm_lib_ioctl,
712 .hw_params = snd_em28xx_hw_capture_params,
713 .hw_free = snd_em28xx_hw_capture_free,
714 .prepare = snd_em28xx_prepare,
715 .trigger = snd_em28xx_capture_trigger,
716 .pointer = snd_em28xx_capture_pointer,
717 .page = snd_pcm_get_vmalloc_page,
718 };
719
720 static void em28xx_audio_free_urb(struct em28xx *dev)
721 {
722 struct usb_device *udev = interface_to_usbdev(dev->intf);
723 int i;
724
725 for (i = 0; i < dev->adev.num_urb; i++) {
726 struct urb *urb = dev->adev.urb[i];
727
728 if (!urb)
729 continue;
730
731 usb_free_coherent(udev, urb->transfer_buffer_length,
732 dev->adev.transfer_buffer[i],
733 urb->transfer_dma);
734
735 usb_free_urb(urb);
736 }
737 kfree(dev->adev.urb);
738 kfree(dev->adev.transfer_buffer);
739 dev->adev.num_urb = 0;
740 }
741
742 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
743 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
744 struct usb_endpoint_descriptor *e)
745 {
746 int size = le16_to_cpu(e->wMaxPacketSize);
747
748 if (udev->speed == USB_SPEED_HIGH)
749 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
750
751 return size & 0x7ff;
752 }
753
754 static int em28xx_audio_urb_init(struct em28xx *dev)
755 {
756 struct usb_interface *intf;
757 struct usb_endpoint_descriptor *e, *ep = NULL;
758 struct usb_device *udev = interface_to_usbdev(dev->intf);
759 int i, ep_size, interval, num_urb, npackets;
760 int urb_size, bytes_per_transfer;
761 u8 alt;
762
763 if (dev->ifnum)
764 alt = 1;
765 else
766 alt = 7;
767
768 intf = usb_ifnum_to_if(udev, dev->ifnum);
769
770 if (intf->num_altsetting <= alt) {
771 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
772 dev->ifnum, alt);
773 return -ENODEV;
774 }
775
776 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
777 e = &intf->altsetting[alt].endpoint[i].desc;
778 if (!usb_endpoint_dir_in(e))
779 continue;
780 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
781 ep = e;
782 break;
783 }
784 }
785
786 if (!ep) {
787 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
788 return -ENODEV;
789 }
790
791 ep_size = em28xx_audio_ep_packet_size(udev, ep);
792 interval = 1 << (ep->bInterval - 1);
793
794 dev_info(&dev->intf->dev,
795 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
796 EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
797 dev->ifnum, alt, interval, ep_size);
798
799 /* Calculate the number and size of URBs to better fit the audio samples */
800
801 /*
802 * Estimate the number of bytes per DMA transfer.
803 *
804 * This is given by the bit rate (for now, only 48000 Hz) multiplied
805 * by 2 channels and 2 bytes/sample divided by the number of microframe
806 * intervals and by the microframe rate (125 us)
807 */
808 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
809
810 /*
811 * Estimate the number of transfer URBs. Don't let it go past the
812 * maximum number of URBs that is known to be supported by the device.
813 */
814 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
815 if (num_urb > EM28XX_MAX_AUDIO_BUFS)
816 num_urb = EM28XX_MAX_AUDIO_BUFS;
817
818 /*
819 * Now that we know the number of bytes per transfer and the number of
820 * URBs, estimate the typical size of an URB, in order to adjust the
821 * minimal number of packets.
822 */
823 urb_size = bytes_per_transfer / num_urb;
824
825 /*
826 * Now, calculate the amount of audio packets to be filled on each
827 * URB. In order to preserve the old behaviour, use a minimal
828 * threshold for this value.
829 */
830 npackets = EM28XX_MIN_AUDIO_PACKETS;
831 if (urb_size > ep_size * npackets)
832 npackets = DIV_ROUND_UP(urb_size, ep_size);
833
834 dev_info(&dev->intf->dev,
835 "Number of URBs: %d, with %d packets and %d size\n",
836 num_urb, npackets, urb_size);
837
838 /* Estimate the bytes per period */
839 dev->adev.period = urb_size * npackets;
840
841 /* Allocate space to store the number of URBs to be used */
842
843 dev->adev.transfer_buffer = kcalloc(num_urb,
844 sizeof(*dev->adev.transfer_buffer),
845 GFP_KERNEL);
846 if (!dev->adev.transfer_buffer)
847 return -ENOMEM;
848
849 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_KERNEL);
850 if (!dev->adev.urb) {
851 kfree(dev->adev.transfer_buffer);
852 return -ENOMEM;
853 }
854
855 /* Alloc memory for each URB and for each transfer buffer */
856 dev->adev.num_urb = num_urb;
857 for (i = 0; i < num_urb; i++) {
858 struct urb *urb;
859 int j, k;
860 void *buf;
861
862 urb = usb_alloc_urb(npackets, GFP_KERNEL);
863 if (!urb) {
864 em28xx_audio_free_urb(dev);
865 return -ENOMEM;
866 }
867 dev->adev.urb[i] = urb;
868
869 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_KERNEL,
870 &urb->transfer_dma);
871 if (!buf) {
872 dev_err(&dev->intf->dev,
873 "usb_alloc_coherent failed!\n");
874 em28xx_audio_free_urb(dev);
875 return -ENOMEM;
876 }
877 dev->adev.transfer_buffer[i] = buf;
878
879 urb->dev = udev;
880 urb->context = dev;
881 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
882 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
883 urb->transfer_buffer = buf;
884 urb->interval = interval;
885 urb->complete = em28xx_audio_isocirq;
886 urb->number_of_packets = npackets;
887 urb->transfer_buffer_length = ep_size * npackets;
888
889 for (j = k = 0; j < npackets; j++, k += ep_size) {
890 urb->iso_frame_desc[j].offset = k;
891 urb->iso_frame_desc[j].length = ep_size;
892 }
893 }
894
895 return 0;
896 }
897
898 static int em28xx_audio_init(struct em28xx *dev)
899 {
900 struct em28xx_audio *adev = &dev->adev;
901 struct usb_device *udev = interface_to_usbdev(dev->intf);
902 struct snd_pcm *pcm;
903 struct snd_card *card;
904 static int devnr;
905 int err;
906
907 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
908 /*
909 * This device does not support the extension (in this case
910 * the device is expecting the snd-usb-audio module or
911 * doesn't have analog audio support at all)
912 */
913 return 0;
914 }
915
916 dev_info(&dev->intf->dev, "Binding audio extension\n");
917
918 kref_get(&dev->ref);
919
920 dev_info(&dev->intf->dev,
921 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
922 dev_info(&dev->intf->dev,
923 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
924
925 err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
926 THIS_MODULE, 0, &card);
927 if (err < 0)
928 return err;
929
930 spin_lock_init(&adev->slock);
931 adev->sndcard = card;
932 adev->udev = udev;
933
934 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
935 if (err < 0)
936 goto card_free;
937
938 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
939 pcm->info_flags = 0;
940 pcm->private_data = dev;
941 strscpy(pcm->name, "Empia 28xx Capture", sizeof(pcm->name));
942
943 strscpy(card->driver, "Em28xx-Audio", sizeof(card->driver));
944 strscpy(card->shortname, "Em28xx Audio", sizeof(card->shortname));
945 strscpy(card->longname, "Empia Em28xx Audio", sizeof(card->longname));
946
947 INIT_WORK(&adev->wq_trigger, audio_trigger);
948
949 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
950 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
951 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
952 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
953 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
954 em28xx_cvol_new(card, dev, "CD", AC97_CD);
955 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
956 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
957
958 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
959 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
960 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
961 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
962 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
963 }
964
965 err = em28xx_audio_urb_init(dev);
966 if (err)
967 goto card_free;
968
969 err = snd_card_register(card);
970 if (err < 0)
971 goto urb_free;
972
973 dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
974 return 0;
975
976 urb_free:
977 em28xx_audio_free_urb(dev);
978
979 card_free:
980 snd_card_free(card);
981 adev->sndcard = NULL;
982
983 return err;
984 }
985
986 static int em28xx_audio_fini(struct em28xx *dev)
987 {
988 if (!dev)
989 return 0;
990
991 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
992 /*
993 * This device does not support the extension (in this case
994 * the device is expecting the snd-usb-audio module or
995 * doesn't have analog audio support at all)
996 */
997 return 0;
998 }
999
1000 dev_info(&dev->intf->dev, "Closing audio extension\n");
1001
1002 if (dev->adev.sndcard) {
1003 snd_card_disconnect(dev->adev.sndcard);
1004 flush_work(&dev->adev.wq_trigger);
1005
1006 em28xx_audio_free_urb(dev);
1007
1008 snd_card_free(dev->adev.sndcard);
1009 dev->adev.sndcard = NULL;
1010 }
1011
1012 kref_put(&dev->ref, em28xx_free_device);
1013 return 0;
1014 }
1015
1016 static int em28xx_audio_suspend(struct em28xx *dev)
1017 {
1018 if (!dev)
1019 return 0;
1020
1021 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1022 return 0;
1023
1024 dev_info(&dev->intf->dev, "Suspending audio extension\n");
1025 em28xx_deinit_isoc_audio(dev);
1026 atomic_set(&dev->adev.stream_started, 0);
1027 return 0;
1028 }
1029
1030 static int em28xx_audio_resume(struct em28xx *dev)
1031 {
1032 if (!dev)
1033 return 0;
1034
1035 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1036 return 0;
1037
1038 dev_info(&dev->intf->dev, "Resuming audio extension\n");
1039 /* Nothing to do other than schedule_work() ?? */
1040 schedule_work(&dev->adev.wq_trigger);
1041 return 0;
1042 }
1043
1044 static struct em28xx_ops audio_ops = {
1045 .id = EM28XX_AUDIO,
1046 .name = "Em28xx Audio Extension",
1047 .init = em28xx_audio_init,
1048 .fini = em28xx_audio_fini,
1049 .suspend = em28xx_audio_suspend,
1050 .resume = em28xx_audio_resume,
1051 };
1052
1053 static int __init em28xx_alsa_register(void)
1054 {
1055 return em28xx_register_extension(&audio_ops);
1056 }
1057
1058 static void __exit em28xx_alsa_unregister(void)
1059 {
1060 em28xx_unregister_extension(&audio_ops);
1061 }
1062
1063 MODULE_LICENSE("GPL v2");
1064 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1065 MODULE_AUTHOR("Mauro Carvalho Chehab");
1066 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1067 MODULE_VERSION(EM28XX_VERSION);
1068
1069 module_init(em28xx_alsa_register);
1070 module_exit(em28xx_alsa_unregister);
Linux with added FPC-III support