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perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / drivers / media / usb / em28xx / em28xx-audio.c
blob67481fc8244587772dfddf9764b377d52d496b4d
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/proc_fs.h>
35 #include <linux/module.h>
36 #include <sound/core.h>
37 #include <sound/pcm.h>
38 #include <sound/pcm_params.h>
39 #include <sound/info.h>
40 #include <sound/initval.h>
41 #include <sound/control.h>
42 #include <sound/tlv.h>
43 #include <sound/ac97_codec.h>
44 #include <media/v4l2-common.h>
45
46 static int debug;
47 module_param(debug, int, 0644);
48 MODULE_PARM_DESC(debug, "activates debug info");
49
50 #define EM28XX_MAX_AUDIO_BUFS 5
51 #define EM28XX_MIN_AUDIO_PACKETS 64
52
53 #define dprintk(fmt, arg...) do { \
54 if (debug) \
55 dev_printk(KERN_DEBUG, &dev->intf->dev, \
56 "video: %s: " fmt, __func__, ## arg); \
57 } while (0)
58
59 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
60
61 static int em28xx_deinit_isoc_audio(struct em28xx *dev)
62 {
63 int i;
64
65 dprintk("Stopping isoc\n");
66 for (i = 0; i < dev->adev.num_urb; i++) {
67 struct urb *urb = dev->adev.urb[i];
68
69 if (!irqs_disabled())
70 usb_kill_urb(urb);
71 else
72 usb_unlink_urb(urb);
73 }
74
75 return 0;
76 }
77
78 static void em28xx_audio_isocirq(struct urb *urb)
79 {
80 struct em28xx *dev = urb->context;
81 int i;
82 unsigned int oldptr;
83 int period_elapsed = 0;
84 int status;
85 unsigned char *cp;
86 unsigned int stride;
87 struct snd_pcm_substream *substream;
88 struct snd_pcm_runtime *runtime;
89
90 if (dev->disconnected) {
91 dprintk("device disconnected while streaming. URB status=%d.\n",
92 urb->status);
93 atomic_set(&dev->adev.stream_started, 0);
94 return;
95 }
96
97 switch (urb->status) {
98 case 0: /* success */
99 case -ETIMEDOUT: /* NAK */
100 break;
101 case -ECONNRESET: /* kill */
102 case -ENOENT:
103 case -ESHUTDOWN:
104 return;
105 default: /* error */
106 dprintk("urb completion error %d.\n", urb->status);
107 break;
108 }
109
110 if (atomic_read(&dev->adev.stream_started) == 0)
111 return;
112
113 if (dev->adev.capture_pcm_substream) {
114 substream = dev->adev.capture_pcm_substream;
115 runtime = substream->runtime;
116 stride = runtime->frame_bits >> 3;
117
118 for (i = 0; i < urb->number_of_packets; i++) {
119 unsigned long flags;
120 int length =
121 urb->iso_frame_desc[i].actual_length / stride;
122 cp = (unsigned char *)urb->transfer_buffer +
123 urb->iso_frame_desc[i].offset;
124
125 if (!length)
126 continue;
127
128 oldptr = dev->adev.hwptr_done_capture;
129 if (oldptr + length >= runtime->buffer_size) {
130 unsigned int cnt =
131 runtime->buffer_size - oldptr;
132 memcpy(runtime->dma_area + oldptr * stride, cp,
133 cnt * stride);
134 memcpy(runtime->dma_area, cp + cnt * stride,
135 length * stride - cnt * stride);
136 } else {
137 memcpy(runtime->dma_area + oldptr * stride, cp,
138 length * stride);
139 }
140
141 snd_pcm_stream_lock_irqsave(substream, flags);
142
143 dev->adev.hwptr_done_capture += length;
144 if (dev->adev.hwptr_done_capture >=
145 runtime->buffer_size)
146 dev->adev.hwptr_done_capture -=
147 runtime->buffer_size;
148
149 dev->adev.capture_transfer_done += length;
150 if (dev->adev.capture_transfer_done >=
151 runtime->period_size) {
152 dev->adev.capture_transfer_done -=
153 runtime->period_size;
154 period_elapsed = 1;
155 }
156
157 snd_pcm_stream_unlock_irqrestore(substream, flags);
158 }
159 if (period_elapsed)
160 snd_pcm_period_elapsed(substream);
161 }
162 urb->status = 0;
163
164 status = usb_submit_urb(urb, GFP_ATOMIC);
165 if (status < 0)
166 dev_err(&dev->intf->dev,
167 "resubmit of audio urb failed (error=%i)\n",
168 status);
169 }
170
171 static int em28xx_init_audio_isoc(struct em28xx *dev)
172 {
173 int i, err;
174
175 dprintk("Starting isoc transfers\n");
176
177 /* Start streaming */
178 for (i = 0; i < dev->adev.num_urb; i++) {
179 memset(dev->adev.transfer_buffer[i], 0x80,
180 dev->adev.urb[i]->transfer_buffer_length);
181
182 err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC);
183 if (err) {
184 dev_err(&dev->intf->dev,
185 "submit of audio urb failed (error=%i)\n",
186 err);
187 em28xx_deinit_isoc_audio(dev);
188 atomic_set(&dev->adev.stream_started, 0);
189 return err;
190 }
191 }
192
193 return 0;
194 }
195
196 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
197 size_t size)
198 {
199 struct em28xx *dev = snd_pcm_substream_chip(subs);
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 const 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 pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n");
258 return -ENODEV;
259 }
260
261 if (dev->disconnected)
262 return -ENODEV;
263
264 dprintk("opening device and trying to acquire exclusive lock\n");
265
266 nonblock = !!(substream->f_flags & O_NONBLOCK);
267 if (nonblock) {
268 if (!mutex_trylock(&dev->lock))
269 return -EAGAIN;
270 } else {
271 mutex_lock(&dev->lock);
272 }
273
274 runtime->hw = snd_em28xx_hw_capture;
275
276 if (dev->adev.users == 0) {
277 if (!dev->alt || dev->is_audio_only) {
278 struct usb_device *udev;
279
280 udev = interface_to_usbdev(dev->intf);
281
282 if (dev->is_audio_only)
283 /* audio is on a separate interface */
284 dev->alt = 1;
285 else
286 /* audio is on the same interface as video */
287 dev->alt = 7;
288 /*
289 * FIXME: The intention seems to be to select
290 * the alt setting with the largest
291 * wMaxPacketSize for the video endpoint.
292 * At least dev->alt should be used instead, but
293 * we should probably not touch it at all if it
294 * is already >0, because wMaxPacketSize of the
295 * audio endpoints seems to be the same for all.
296 */
297 dprintk("changing alternate number on interface %d to %d\n",
298 dev->ifnum, dev->alt);
299 usb_set_interface(udev, dev->ifnum, dev->alt);
300 }
301
302 /* Sets volume, mute, etc */
303 dev->mute = 0;
304 ret = em28xx_audio_analog_set(dev);
305 if (ret < 0)
306 goto err;
307 }
308
309 kref_get(&dev->ref);
310 dev->adev.users++;
311 mutex_unlock(&dev->lock);
312
313 /* Dynamically adjust the period size */
314 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
315 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
316 dev->adev.period * 95 / 100,
317 dev->adev.period * 105 / 100);
318
319 dev->adev.capture_pcm_substream = substream;
320
321 return 0;
322 err:
323 mutex_unlock(&dev->lock);
324
325 dev_err(&dev->intf->dev,
326 "Error while configuring em28xx mixer\n");
327 return ret;
328 }
329
330 static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
331 {
332 struct em28xx *dev = snd_pcm_substream_chip(substream);
333
334 dprintk("closing device\n");
335
336 dev->mute = 1;
337 mutex_lock(&dev->lock);
338 dev->adev.users--;
339 if (atomic_read(&dev->adev.stream_started) > 0) {
340 atomic_set(&dev->adev.stream_started, 0);
341 schedule_work(&dev->adev.wq_trigger);
342 }
343
344 em28xx_audio_analog_set(dev);
345 if (substream->runtime->dma_area) {
346 dprintk("freeing\n");
347 vfree(substream->runtime->dma_area);
348 substream->runtime->dma_area = NULL;
349 }
350 mutex_unlock(&dev->lock);
351 kref_put(&dev->ref, em28xx_free_device);
352
353 return 0;
354 }
355
356 static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream,
357 struct snd_pcm_hw_params *hw_params)
358 {
359 int ret;
360 struct em28xx *dev = snd_pcm_substream_chip(substream);
361
362 if (dev->disconnected)
363 return -ENODEV;
364
365 dprintk("Setting capture parameters\n");
366
367 ret = snd_pcm_alloc_vmalloc_buffer(substream,
368 params_buffer_bytes(hw_params));
369 if (ret < 0)
370 return ret;
371 #if 0
372 /*
373 * TODO: set up em28xx audio chip to deliver the correct audio format,
374 * current default is 48000hz multiplexed => 96000hz mono
375 * which shouldn't matter since analogue TV only supports mono
376 */
377 unsigned int channels, rate, format;
378
379 format = params_format(hw_params);
380 rate = params_rate(hw_params);
381 channels = params_channels(hw_params);
382 #endif
383
384 return 0;
385 }
386
387 static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream)
388 {
389 struct em28xx *dev = snd_pcm_substream_chip(substream);
390 struct em28xx_audio *adev = &dev->adev;
391
392 dprintk("Stop capture, if needed\n");
393
394 if (atomic_read(&adev->stream_started) > 0) {
395 atomic_set(&adev->stream_started, 0);
396 schedule_work(&adev->wq_trigger);
397 }
398
399 return 0;
400 }
401
402 static int snd_em28xx_prepare(struct snd_pcm_substream *substream)
403 {
404 struct em28xx *dev = snd_pcm_substream_chip(substream);
405
406 if (dev->disconnected)
407 return -ENODEV;
408
409 dev->adev.hwptr_done_capture = 0;
410 dev->adev.capture_transfer_done = 0;
411
412 return 0;
413 }
414
415 static void audio_trigger(struct work_struct *work)
416 {
417 struct em28xx_audio *adev =
418 container_of(work, struct em28xx_audio, wq_trigger);
419 struct em28xx *dev = container_of(adev, struct em28xx, adev);
420
421 if (atomic_read(&adev->stream_started)) {
422 dprintk("starting capture");
423 em28xx_init_audio_isoc(dev);
424 } else {
425 dprintk("stopping capture");
426 em28xx_deinit_isoc_audio(dev);
427 }
428 }
429
430 static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
431 int cmd)
432 {
433 struct em28xx *dev = snd_pcm_substream_chip(substream);
434 int retval = 0;
435
436 if (dev->disconnected)
437 return -ENODEV;
438
439 switch (cmd) {
440 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
441 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
442 case SNDRV_PCM_TRIGGER_START:
443 atomic_set(&dev->adev.stream_started, 1);
444 break;
445 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
446 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
447 case SNDRV_PCM_TRIGGER_STOP:
448 atomic_set(&dev->adev.stream_started, 0);
449 break;
450 default:
451 retval = -EINVAL;
452 }
453 schedule_work(&dev->adev.wq_trigger);
454 return retval;
455 }
456
457 static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream
458 *substream)
459 {
460 unsigned long flags;
461 struct em28xx *dev;
462 snd_pcm_uframes_t hwptr_done;
463
464 dev = snd_pcm_substream_chip(substream);
465 if (dev->disconnected)
466 return SNDRV_PCM_POS_XRUN;
467
468 spin_lock_irqsave(&dev->adev.slock, flags);
469 hwptr_done = dev->adev.hwptr_done_capture;
470 spin_unlock_irqrestore(&dev->adev.slock, flags);
471
472 return hwptr_done;
473 }
474
475 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
476 unsigned long offset)
477 {
478 void *pageptr = subs->runtime->dma_area + offset;
479
480 return vmalloc_to_page(pageptr);
481 }
482
483 /*
484 * AC97 volume control support
485 */
486 static int em28xx_vol_info(struct snd_kcontrol *kcontrol,
487 struct snd_ctl_elem_info *info)
488 {
489 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
490
491 if (dev->disconnected)
492 return -ENODEV;
493
494 info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
495 info->count = 2;
496 info->value.integer.min = 0;
497 info->value.integer.max = 0x1f;
498
499 return 0;
500 }
501
502 static int em28xx_vol_put(struct snd_kcontrol *kcontrol,
503 struct snd_ctl_elem_value *value)
504 {
505 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
506 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
507 u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) |
508 (0x1f - (value->value.integer.value[1] & 0x1f)) << 8;
509 int nonblock = 0;
510 int rc;
511
512 if (dev->disconnected)
513 return -ENODEV;
514
515 if (substream)
516 nonblock = !!(substream->f_flags & O_NONBLOCK);
517 if (nonblock) {
518 if (!mutex_trylock(&dev->lock))
519 return -EAGAIN;
520 } else {
521 mutex_lock(&dev->lock);
522 }
523 rc = em28xx_read_ac97(dev, kcontrol->private_value);
524 if (rc < 0)
525 goto err;
526
527 val |= rc & 0x8000; /* Preserve the mute flag */
528
529 rc = em28xx_write_ac97(dev, kcontrol->private_value, val);
530 if (rc < 0)
531 goto err;
532
533 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
534 (val & 0x8000) ? "muted " : "",
535 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
536 val, (int)kcontrol->private_value);
537
538 err:
539 mutex_unlock(&dev->lock);
540 return rc;
541 }
542
543 static int em28xx_vol_get(struct snd_kcontrol *kcontrol,
544 struct snd_ctl_elem_value *value)
545 {
546 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
547 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
548 int nonblock = 0;
549 int val;
550
551 if (dev->disconnected)
552 return -ENODEV;
553
554 if (substream)
555 nonblock = !!(substream->f_flags & O_NONBLOCK);
556 if (nonblock) {
557 if (!mutex_trylock(&dev->lock))
558 return -EAGAIN;
559 } else {
560 mutex_lock(&dev->lock);
561 }
562 val = em28xx_read_ac97(dev, kcontrol->private_value);
563 mutex_unlock(&dev->lock);
564 if (val < 0)
565 return val;
566
567 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
568 (val & 0x8000) ? "muted " : "",
569 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
570 val, (int)kcontrol->private_value);
571
572 value->value.integer.value[0] = 0x1f - (val & 0x1f);
573 value->value.integer.value[1] = 0x1f - ((val >> 8) & 0x1f);
574
575 return 0;
576 }
577
578 static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol,
579 struct snd_ctl_elem_value *value)
580 {
581 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
582 u16 val = value->value.integer.value[0];
583 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
584 int nonblock = 0;
585 int rc;
586
587 if (dev->disconnected)
588 return -ENODEV;
589
590 if (substream)
591 nonblock = !!(substream->f_flags & O_NONBLOCK);
592 if (nonblock) {
593 if (!mutex_trylock(&dev->lock))
594 return -EAGAIN;
595 } else {
596 mutex_lock(&dev->lock);
597 }
598 rc = em28xx_read_ac97(dev, kcontrol->private_value);
599 if (rc < 0)
600 goto err;
601
602 if (val)
603 rc &= 0x1f1f;
604 else
605 rc |= 0x8000;
606
607 rc = em28xx_write_ac97(dev, kcontrol->private_value, rc);
608 if (rc < 0)
609 goto err;
610
611 dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n",
612 (val & 0x8000) ? "muted " : "",
613 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
614 val, (int)kcontrol->private_value);
615
616 err:
617 mutex_unlock(&dev->lock);
618 return rc;
619 }
620
621 static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol,
622 struct snd_ctl_elem_value *value)
623 {
624 struct em28xx *dev = snd_kcontrol_chip(kcontrol);
625 struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream;
626 int nonblock = 0;
627 int val;
628
629 if (dev->disconnected)
630 return -ENODEV;
631
632 if (substream)
633 nonblock = !!(substream->f_flags & O_NONBLOCK);
634 if (nonblock) {
635 if (!mutex_trylock(&dev->lock))
636 return -EAGAIN;
637 } else {
638 mutex_lock(&dev->lock);
639 }
640 val = em28xx_read_ac97(dev, kcontrol->private_value);
641 mutex_unlock(&dev->lock);
642 if (val < 0)
643 return val;
644
645 if (val & 0x8000)
646 value->value.integer.value[0] = 0;
647 else
648 value->value.integer.value[0] = 1;
649
650 dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n",
651 (val & 0x8000) ? "muted " : "",
652 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f),
653 val, (int)kcontrol->private_value);
654
655 return 0;
656 }
657
658 static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0);
659
660 static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev,
661 char *name, int id)
662 {
663 int err;
664 char ctl_name[44];
665 struct snd_kcontrol *kctl;
666 struct snd_kcontrol_new tmp;
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 Mute Control */
674 sprintf(ctl_name, "%s Switch", name);
675 tmp.get = em28xx_vol_get_mute;
676 tmp.put = em28xx_vol_put_mute;
677 tmp.info = snd_ctl_boolean_mono_info;
678 kctl = snd_ctl_new1(&tmp, dev);
679 err = snd_ctl_add(card, kctl);
680 if (err < 0)
681 return err;
682 dprintk("Added control %s for ac97 volume control 0x%04x\n",
683 ctl_name, id);
684
685 memset(&tmp, 0, sizeof(tmp));
686 tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
687 tmp.private_value = id,
688 tmp.name = ctl_name,
689
690 /* Add Volume Control */
691 sprintf(ctl_name, "%s Volume", name);
692 tmp.get = em28xx_vol_get;
693 tmp.put = em28xx_vol_put;
694 tmp.info = em28xx_vol_info;
695 tmp.tlv.p = em28xx_db_scale,
696 kctl = snd_ctl_new1(&tmp, dev);
697 err = snd_ctl_add(card, kctl);
698 if (err < 0)
699 return err;
700 dprintk("Added control %s for ac97 volume control 0x%04x\n",
701 ctl_name, id);
702
703 return 0;
704 }
705
706 /*
707 * register/unregister code and data
708 */
709 static const struct snd_pcm_ops snd_em28xx_pcm_capture = {
710 .open = snd_em28xx_capture_open,
711 .close = snd_em28xx_pcm_close,
712 .ioctl = snd_pcm_lib_ioctl,
713 .hw_params = snd_em28xx_hw_capture_params,
714 .hw_free = snd_em28xx_hw_capture_free,
715 .prepare = snd_em28xx_prepare,
716 .trigger = snd_em28xx_capture_trigger,
717 .pointer = snd_em28xx_capture_pointer,
718 .page = snd_pcm_get_vmalloc_page,
719 };
720
721 static void em28xx_audio_free_urb(struct em28xx *dev)
722 {
723 struct usb_device *udev = interface_to_usbdev(dev->intf);
724 int i;
725
726 for (i = 0; i < dev->adev.num_urb; i++) {
727 struct urb *urb = dev->adev.urb[i];
728
729 if (!urb)
730 continue;
731
732 usb_free_coherent(udev, urb->transfer_buffer_length,
733 dev->adev.transfer_buffer[i],
734 urb->transfer_dma);
735
736 usb_free_urb(urb);
737 }
738 kfree(dev->adev.urb);
739 kfree(dev->adev.transfer_buffer);
740 dev->adev.num_urb = 0;
741 }
742
743 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
744 static int em28xx_audio_ep_packet_size(struct usb_device *udev,
745 struct usb_endpoint_descriptor *e)
746 {
747 int size = le16_to_cpu(e->wMaxPacketSize);
748
749 if (udev->speed == USB_SPEED_HIGH)
750 return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03));
751
752 return size & 0x7ff;
753 }
754
755 static int em28xx_audio_urb_init(struct em28xx *dev)
756 {
757 struct usb_interface *intf;
758 struct usb_endpoint_descriptor *e, *ep = NULL;
759 struct usb_device *udev = interface_to_usbdev(dev->intf);
760 int i, ep_size, interval, num_urb, npackets;
761 int urb_size, bytes_per_transfer;
762 u8 alt;
763
764 if (dev->ifnum)
765 alt = 1;
766 else
767 alt = 7;
768
769 intf = usb_ifnum_to_if(udev, dev->ifnum);
770
771 if (intf->num_altsetting <= alt) {
772 dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n",
773 dev->ifnum, alt);
774 return -ENODEV;
775 }
776
777 for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) {
778 e = &intf->altsetting[alt].endpoint[i].desc;
779 if (!usb_endpoint_dir_in(e))
780 continue;
781 if (e->bEndpointAddress == EM28XX_EP_AUDIO) {
782 ep = e;
783 break;
784 }
785 }
786
787 if (!ep) {
788 dev_err(&dev->intf->dev, "Couldn't find an audio endpoint");
789 return -ENODEV;
790 }
791
792 ep_size = em28xx_audio_ep_packet_size(udev, ep);
793 interval = 1 << (ep->bInterval - 1);
794
795 dev_info(&dev->intf->dev,
796 "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
797 EM28XX_EP_AUDIO, usb_speed_string(udev->speed),
798 dev->ifnum, alt, interval, ep_size);
799
800 /* Calculate the number and size of URBs to better fit the audio samples */
801
802 /*
803 * Estimate the number of bytes per DMA transfer.
804 *
805 * This is given by the bit rate (for now, only 48000 Hz) multiplied
806 * by 2 channels and 2 bytes/sample divided by the number of microframe
807 * intervals and by the microframe rate (125 us)
808 */
809 bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval);
810
811 /*
812 * Estimate the number of transfer URBs. Don't let it go past the
813 * maximum number of URBs that is known to be supported by the device.
814 */
815 num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size);
816 if (num_urb > EM28XX_MAX_AUDIO_BUFS)
817 num_urb = EM28XX_MAX_AUDIO_BUFS;
818
819 /*
820 * Now that we know the number of bytes per transfer and the number of
821 * URBs, estimate the typical size of an URB, in order to adjust the
822 * minimal number of packets.
823 */
824 urb_size = bytes_per_transfer / num_urb;
825
826 /*
827 * Now, calculate the amount of audio packets to be filled on each
828 * URB. In order to preserve the old behaviour, use a minimal
829 * threshold for this value.
830 */
831 npackets = EM28XX_MIN_AUDIO_PACKETS;
832 if (urb_size > ep_size * npackets)
833 npackets = DIV_ROUND_UP(urb_size, ep_size);
834
835 dev_info(&dev->intf->dev,
836 "Number of URBs: %d, with %d packets and %d size\n",
837 num_urb, npackets, urb_size);
838
839 /* Estimate the bytes per period */
840 dev->adev.period = urb_size * npackets;
841
842 /* Allocate space to store the number of URBs to be used */
843
844 dev->adev.transfer_buffer = kcalloc(num_urb,
845 sizeof(*dev->adev.transfer_buffer),
846 GFP_ATOMIC);
847 if (!dev->adev.transfer_buffer)
848 return -ENOMEM;
849
850 dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC);
851 if (!dev->adev.urb) {
852 kfree(dev->adev.transfer_buffer);
853 return -ENOMEM;
854 }
855
856 /* Alloc memory for each URB and for each transfer buffer */
857 dev->adev.num_urb = num_urb;
858 for (i = 0; i < num_urb; i++) {
859 struct urb *urb;
860 int j, k;
861 void *buf;
862
863 urb = usb_alloc_urb(npackets, GFP_ATOMIC);
864 if (!urb) {
865 em28xx_audio_free_urb(dev);
866 return -ENOMEM;
867 }
868 dev->adev.urb[i] = urb;
869
870 buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_ATOMIC,
871 &urb->transfer_dma);
872 if (!buf) {
873 dev_err(&dev->intf->dev,
874 "usb_alloc_coherent failed!\n");
875 em28xx_audio_free_urb(dev);
876 return -ENOMEM;
877 }
878 dev->adev.transfer_buffer[i] = buf;
879
880 urb->dev = udev;
881 urb->context = dev;
882 urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO);
883 urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
884 urb->transfer_buffer = buf;
885 urb->interval = interval;
886 urb->complete = em28xx_audio_isocirq;
887 urb->number_of_packets = npackets;
888 urb->transfer_buffer_length = ep_size * npackets;
889
890 for (j = k = 0; j < npackets; j++, k += ep_size) {
891 urb->iso_frame_desc[j].offset = k;
892 urb->iso_frame_desc[j].length = ep_size;
893 }
894 }
895
896 return 0;
897 }
898
899 static int em28xx_audio_init(struct em28xx *dev)
900 {
901 struct em28xx_audio *adev = &dev->adev;
902 struct usb_device *udev = interface_to_usbdev(dev->intf);
903 struct snd_pcm *pcm;
904 struct snd_card *card;
905 static int devnr;
906 int err;
907
908 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
909 /*
910 * This device does not support the extension (in this case
911 * the device is expecting the snd-usb-audio module or
912 * doesn't have analog audio support at all)
913 */
914 return 0;
915 }
916
917 dev_info(&dev->intf->dev, "Binding audio extension\n");
918
919 kref_get(&dev->ref);
920
921 dev_info(&dev->intf->dev,
922 "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n");
923 dev_info(&dev->intf->dev,
924 "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n");
925
926 err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio",
927 THIS_MODULE, 0, &card);
928 if (err < 0)
929 return err;
930
931 spin_lock_init(&adev->slock);
932 adev->sndcard = card;
933 adev->udev = udev;
934
935 err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm);
936 if (err < 0)
937 goto card_free;
938
939 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture);
940 pcm->info_flags = 0;
941 pcm->private_data = dev;
942 strcpy(pcm->name, "Empia 28xx Capture");
943
944 strcpy(card->driver, "Em28xx-Audio");
945 strcpy(card->shortname, "Em28xx Audio");
946 strcpy(card->longname, "Empia Em28xx Audio");
947
948 INIT_WORK(&adev->wq_trigger, audio_trigger);
949
950 if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
951 em28xx_cvol_new(card, dev, "Video", AC97_VIDEO);
952 em28xx_cvol_new(card, dev, "Line In", AC97_LINE);
953 em28xx_cvol_new(card, dev, "Phone", AC97_PHONE);
954 em28xx_cvol_new(card, dev, "Microphone", AC97_MIC);
955 em28xx_cvol_new(card, dev, "CD", AC97_CD);
956 em28xx_cvol_new(card, dev, "AUX", AC97_AUX);
957 em28xx_cvol_new(card, dev, "PCM", AC97_PCM);
958
959 em28xx_cvol_new(card, dev, "Master", AC97_MASTER);
960 em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE);
961 em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO);
962 em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER);
963 em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER);
964 }
965
966 err = em28xx_audio_urb_init(dev);
967 if (err)
968 goto card_free;
969
970 err = snd_card_register(card);
971 if (err < 0)
972 goto urb_free;
973
974 dev_info(&dev->intf->dev, "Audio extension successfully initialized\n");
975 return 0;
976
977 urb_free:
978 em28xx_audio_free_urb(dev);
979
980 card_free:
981 snd_card_free(card);
982 adev->sndcard = NULL;
983
984 return err;
985 }
986
987 static int em28xx_audio_fini(struct em28xx *dev)
988 {
989 if (!dev)
990 return 0;
991
992 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) {
993 /*
994 * This device does not support the extension (in this case
995 * the device is expecting the snd-usb-audio module or
996 * doesn't have analog audio support at all)
997 */
998 return 0;
999 }
1000
1001 dev_info(&dev->intf->dev, "Closing audio extension\n");
1002
1003 if (dev->adev.sndcard) {
1004 snd_card_disconnect(dev->adev.sndcard);
1005 flush_work(&dev->adev.wq_trigger);
1006
1007 em28xx_audio_free_urb(dev);
1008
1009 snd_card_free(dev->adev.sndcard);
1010 dev->adev.sndcard = NULL;
1011 }
1012
1013 kref_put(&dev->ref, em28xx_free_device);
1014 return 0;
1015 }
1016
1017 static int em28xx_audio_suspend(struct em28xx *dev)
1018 {
1019 if (!dev)
1020 return 0;
1021
1022 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1023 return 0;
1024
1025 dev_info(&dev->intf->dev, "Suspending audio extension\n");
1026 em28xx_deinit_isoc_audio(dev);
1027 atomic_set(&dev->adev.stream_started, 0);
1028 return 0;
1029 }
1030
1031 static int em28xx_audio_resume(struct em28xx *dev)
1032 {
1033 if (!dev)
1034 return 0;
1035
1036 if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR)
1037 return 0;
1038
1039 dev_info(&dev->intf->dev, "Resuming audio extension\n");
1040 /* Nothing to do other than schedule_work() ?? */
1041 schedule_work(&dev->adev.wq_trigger);
1042 return 0;
1043 }
1044
1045 static struct em28xx_ops audio_ops = {
1046 .id = EM28XX_AUDIO,
1047 .name = "Em28xx Audio Extension",
1048 .init = em28xx_audio_init,
1049 .fini = em28xx_audio_fini,
1050 .suspend = em28xx_audio_suspend,
1051 .resume = em28xx_audio_resume,
1052 };
1053
1054 static int __init em28xx_alsa_register(void)
1055 {
1056 return em28xx_register_extension(&audio_ops);
1057 }
1058
1059 static void __exit em28xx_alsa_unregister(void)
1060 {
1061 em28xx_unregister_extension(&audio_ops);
1062 }
1063
1064 MODULE_LICENSE("GPL v2");
1065 MODULE_AUTHOR("Markus Rechberger <mrechberger@gmail.com>");
1066 MODULE_AUTHOR("Mauro Carvalho Chehab");
1067 MODULE_DESCRIPTION(DRIVER_DESC " - audio interface");
1068 MODULE_VERSION(EM28XX_VERSION);
1069
1070 module_init(em28xx_alsa_register);
1071 module_exit(em28xx_alsa_unregister);
Linux with added FPC-III support