free electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
/*****************************************************************************
 *
 * Copyright (C) 2008 Cedric Bregardis <cedric.bregardis@free.fr> and
 * Jean-Christian Hassler <jhassler@free.fr>
 *
 * This file is part of the Audiowerk2 ALSA driver
 *
 * The Audiowerk2 ALSA driver is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.
 *
 * The Audiowerk2 ALSA driver is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Audiowerk2 ALSA driver; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 *****************************************************************************/
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/control.h>

#include "saa7146.h"
#include "aw2-saa7146.h"

MODULE_AUTHOR("Cedric Bregardis <cedric.bregardis@free.fr>, "
	      "Jean-Christian Hassler <jhassler@free.fr>");
MODULE_DESCRIPTION("Emagic Audiowerk 2 sound driver");
MODULE_LICENSE("GPL");

/*********************************
 * DEFINES
 ********************************/
#define CTL_ROUTE_ANALOG 0
#define CTL_ROUTE_DIGITAL 1

/*********************************
 * TYPEDEFS
 ********************************/
  /* hardware definition */
static struct snd_pcm_hardware snd_aw2_playback_hw = {
	.info = (SNDRV_PCM_INFO_MMAP |
		 SNDRV_PCM_INFO_INTERLEAVED |
		 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rates = SNDRV_PCM_RATE_44100,
	.rate_min = 44100,
	.rate_max = 44100,
	.channels_min = 2,
	.channels_max = 4,
	.buffer_bytes_max = 32768,
	.period_bytes_min = 4096,
	.period_bytes_max = 32768,
	.periods_min = 1,
	.periods_max = 1024,
};

static struct snd_pcm_hardware snd_aw2_capture_hw = {
	.info = (SNDRV_PCM_INFO_MMAP |
		 SNDRV_PCM_INFO_INTERLEAVED |
		 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID),
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rates = SNDRV_PCM_RATE_44100,
	.rate_min = 44100,
	.rate_max = 44100,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = 32768,
	.period_bytes_min = 4096,
	.period_bytes_max = 32768,
	.periods_min = 1,
	.periods_max = 1024,
};

struct aw2_pcm_device {
	struct snd_pcm *pcm;
	unsigned int stream_number;
	struct aw2 *chip;
};

struct aw2 {
	struct snd_aw2_saa7146 saa7146;

	struct pci_dev *pci;
	int irq;
	spinlock_t reg_lock;
	struct mutex mtx;

	unsigned long iobase_phys;
	void __iomem *iobase_virt;

	struct snd_card *card;

	struct aw2_pcm_device device_playback[NB_STREAM_PLAYBACK];
	struct aw2_pcm_device device_capture[NB_STREAM_CAPTURE];
};

/*********************************
 * FUNCTION DECLARATIONS
 ********************************/
static int snd_aw2_dev_free(struct snd_device *device);
static int snd_aw2_create(struct snd_card *card,
			  struct pci_dev *pci, struct aw2 **rchip);
static int snd_aw2_probe(struct pci_dev *pci,
			 const struct pci_device_id *pci_id);
static void snd_aw2_remove(struct pci_dev *pci);
static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream);
static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream);
static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream);
static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream);
static int snd_aw2_pcm_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *hw_params);
static int snd_aw2_pcm_hw_free(struct snd_pcm_substream *substream);
static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream);
static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream);
static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
					int cmd);
static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
				       int cmd);
static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
						      *substream);
static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
						     *substream);
static int snd_aw2_new_pcm(struct aw2 *chip);

static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
					       struct snd_ctl_elem_info *uinfo);
static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
					      struct snd_ctl_elem_value
					      *ucontrol);
static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
					      struct snd_ctl_elem_value
					      *ucontrol);

/*********************************
 * VARIABLES
 ********************************/
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for Audiowerk2 soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for the Audiowerk2 soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable Audiowerk2 soundcard.");

static const struct pci_device_id snd_aw2_ids[] = {
	{PCI_VENDOR_ID_PHILIPS, PCI_DEVICE_ID_PHILIPS_SAA7146, 0, 0,
	 0, 0, 0},
	{0}
};

MODULE_DEVICE_TABLE(pci, snd_aw2_ids);

/* pci_driver definition */
static struct pci_driver aw2_driver = {
	.name = KBUILD_MODNAME,
	.id_table = snd_aw2_ids,
	.probe = snd_aw2_probe,
	.remove = snd_aw2_remove,
};

module_pci_driver(aw2_driver);

/* operators for playback PCM alsa interface */
static const struct snd_pcm_ops snd_aw2_playback_ops = {
	.open = snd_aw2_pcm_playback_open,
	.close = snd_aw2_pcm_playback_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_aw2_pcm_hw_params,
	.hw_free = snd_aw2_pcm_hw_free,
	.prepare = snd_aw2_pcm_prepare_playback,
	.trigger = snd_aw2_pcm_trigger_playback,
	.pointer = snd_aw2_pcm_pointer_playback,
};

/* operators for capture PCM alsa interface */
static const struct snd_pcm_ops snd_aw2_capture_ops = {
	.open = snd_aw2_pcm_capture_open,
	.close = snd_aw2_pcm_capture_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_aw2_pcm_hw_params,
	.hw_free = snd_aw2_pcm_hw_free,
	.prepare = snd_aw2_pcm_prepare_capture,
	.trigger = snd_aw2_pcm_trigger_capture,
	.pointer = snd_aw2_pcm_pointer_capture,
};

static struct snd_kcontrol_new aw2_control = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "PCM Capture Route",
	.index = 0,
	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
	.private_value = 0xffff,
	.info = snd_aw2_control_switch_capture_info,
	.get = snd_aw2_control_switch_capture_get,
	.put = snd_aw2_control_switch_capture_put
};

/*********************************
 * FUNCTION IMPLEMENTATIONS
 ********************************/

/* component-destructor */
static int snd_aw2_dev_free(struct snd_device *device)
{
	struct aw2 *chip = device->device_data;

	/* Free hardware */
	snd_aw2_saa7146_free(&chip->saa7146);

	/* release the irq */
	if (chip->irq >= 0)
		free_irq(chip->irq, (void *)chip);
	/* release the i/o ports & memory */
	iounmap(chip->iobase_virt);
	pci_release_regions(chip->pci);
	/* disable the PCI entry */
	pci_disable_device(chip->pci);
	/* release the data */
	kfree(chip);

	return 0;
}

/* chip-specific constructor */
static int snd_aw2_create(struct snd_card *card,
			  struct pci_dev *pci, struct aw2 **rchip)
{
	struct aw2 *chip;
	int err;
	static struct snd_device_ops ops = {
		.dev_free = snd_aw2_dev_free,
	};

	*rchip = NULL;

	/* initialize the PCI entry */
	err = pci_enable_device(pci);
	if (err < 0)
		return err;
	pci_set_master(pci);

	/* check PCI availability (32bit DMA) */
	if ((dma_set_mask(&pci->dev, DMA_BIT_MASK(32)) < 0) ||
	    (dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(32)) < 0)) {
		dev_err(card->dev, "Impossible to set 32bit mask DMA\n");
		pci_disable_device(pci);
		return -ENXIO;
	}
	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (chip == NULL) {
		pci_disable_device(pci);
		return -ENOMEM;
	}

	/* initialize the stuff */
	chip->card = card;
	chip->pci = pci;
	chip->irq = -1;

	/* (1) PCI resource allocation */
	err = pci_request_regions(pci, "Audiowerk2");
	if (err < 0) {
		pci_disable_device(pci);
		kfree(chip);
		return err;
	}
	chip->iobase_phys = pci_resource_start(pci, 0);
	chip->iobase_virt =
		ioremap_nocache(chip->iobase_phys,
				pci_resource_len(pci, 0));

	if (chip->iobase_virt == NULL) {
		dev_err(card->dev, "unable to remap memory region");
		pci_release_regions(pci);
		pci_disable_device(pci);
		kfree(chip);
		return -ENOMEM;
	}

	/* (2) initialization of the chip hardware */
	snd_aw2_saa7146_setup(&chip->saa7146, chip->iobase_virt);

	if (request_irq(pci->irq, snd_aw2_saa7146_interrupt,
			IRQF_SHARED, KBUILD_MODNAME, chip)) {
		dev_err(card->dev, "Cannot grab irq %d\n", pci->irq);

		iounmap(chip->iobase_virt);
		pci_release_regions(chip->pci);
		pci_disable_device(chip->pci);
		kfree(chip);
		return -EBUSY;
	}
	chip->irq = pci->irq;

	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	if (err < 0) {
		free_irq(chip->irq, (void *)chip);
		iounmap(chip->iobase_virt);
		pci_release_regions(chip->pci);
		pci_disable_device(chip->pci);
		kfree(chip);
		return err;
	}

	*rchip = chip;

	dev_info(card->dev,
		 "Audiowerk 2 sound card (saa7146 chipset) detected and managed\n");
	return 0;
}

/* constructor */
static int snd_aw2_probe(struct pci_dev *pci,
			 const struct pci_device_id *pci_id)
{
	static int dev;
	struct snd_card *card;
	struct aw2 *chip;
	int err;

	/* (1) Continue if device is not enabled, else inc dev */
	if (dev >= SNDRV_CARDS)
		return -ENODEV;
	if (!enable[dev]) {
		dev++;
		return -ENOENT;
	}

	/* (2) Create card instance */
	err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
			   0, &card);
	if (err < 0)
		return err;

	/* (3) Create main component */
	err = snd_aw2_create(card, pci, &chip);
	if (err < 0) {
		snd_card_free(card);
		return err;
	}

	/* initialize mutex */
	mutex_init(&chip->mtx);
	/* init spinlock */
	spin_lock_init(&chip->reg_lock);
	/* (4) Define driver ID and name string */
	strcpy(card->driver, "aw2");
	strcpy(card->shortname, "Audiowerk2");

	sprintf(card->longname, "%s with SAA7146 irq %i",
		card->shortname, chip->irq);

	/* (5) Create other components */
	snd_aw2_new_pcm(chip);

	/* (6) Register card instance */
	err = snd_card_register(card);
	if (err < 0) {
		snd_card_free(card);
		return err;
	}

	/* (7) Set PCI driver data */
	pci_set_drvdata(pci, card);

	dev++;
	return 0;
}

/* destructor */
static void snd_aw2_remove(struct pci_dev *pci)
{
	snd_card_free(pci_get_drvdata(pci));
}

/* open callback */
static int snd_aw2_pcm_playback_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	dev_dbg(substream->pcm->card->dev, "Playback_open\n");
	runtime->hw = snd_aw2_playback_hw;
	return 0;
}

/* close callback */
static int snd_aw2_pcm_playback_close(struct snd_pcm_substream *substream)
{
	return 0;

}

static int snd_aw2_pcm_capture_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	dev_dbg(substream->pcm->card->dev, "Capture_open\n");
	runtime->hw = snd_aw2_capture_hw;
	return 0;
}

/* close callback */
static int snd_aw2_pcm_capture_close(struct snd_pcm_substream *substream)
{
	/* TODO: something to do ? */
	return 0;
}

 /* hw_params callback */
static int snd_aw2_pcm_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *hw_params)
{
	return snd_pcm_lib_malloc_pages(substream,
					params_buffer_bytes(hw_params));
}

/* hw_free callback */
static int snd_aw2_pcm_hw_free(struct snd_pcm_substream *substream)
{
	return snd_pcm_lib_free_pages(substream);
}

/* prepare callback for playback */
static int snd_aw2_pcm_prepare_playback(struct snd_pcm_substream *substream)
{
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long period_size, buffer_size;

	mutex_lock(&chip->mtx);

	period_size = snd_pcm_lib_period_bytes(substream);
	buffer_size = snd_pcm_lib_buffer_bytes(substream);

	snd_aw2_saa7146_pcm_init_playback(&chip->saa7146,
					  pcm_device->stream_number,
					  runtime->dma_addr, period_size,
					  buffer_size);

	/* Define Interrupt callback */
	snd_aw2_saa7146_define_it_playback_callback(pcm_device->stream_number,
						    (snd_aw2_saa7146_it_cb)
						    snd_pcm_period_elapsed,
						    (void *)substream);

	mutex_unlock(&chip->mtx);

	return 0;
}

/* prepare callback for capture */
static int snd_aw2_pcm_prepare_capture(struct snd_pcm_substream *substream)
{
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long period_size, buffer_size;

	mutex_lock(&chip->mtx);

	period_size = snd_pcm_lib_period_bytes(substream);
	buffer_size = snd_pcm_lib_buffer_bytes(substream);

	snd_aw2_saa7146_pcm_init_capture(&chip->saa7146,
					 pcm_device->stream_number,
					 runtime->dma_addr, period_size,
					 buffer_size);

	/* Define Interrupt callback */
	snd_aw2_saa7146_define_it_capture_callback(pcm_device->stream_number,
						   (snd_aw2_saa7146_it_cb)
						   snd_pcm_period_elapsed,
						   (void *)substream);

	mutex_unlock(&chip->mtx);

	return 0;
}

/* playback trigger callback */
static int snd_aw2_pcm_trigger_playback(struct snd_pcm_substream *substream,
					int cmd)
{
	int status = 0;
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	spin_lock(&chip->reg_lock);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		snd_aw2_saa7146_pcm_trigger_start_playback(&chip->saa7146,
							   pcm_device->
							   stream_number);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		snd_aw2_saa7146_pcm_trigger_stop_playback(&chip->saa7146,
							  pcm_device->
							  stream_number);
		break;
	default:
		status = -EINVAL;
	}
	spin_unlock(&chip->reg_lock);
	return status;
}

/* capture trigger callback */
static int snd_aw2_pcm_trigger_capture(struct snd_pcm_substream *substream,
				       int cmd)
{
	int status = 0;
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	spin_lock(&chip->reg_lock);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		snd_aw2_saa7146_pcm_trigger_start_capture(&chip->saa7146,
							  pcm_device->
							  stream_number);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		snd_aw2_saa7146_pcm_trigger_stop_capture(&chip->saa7146,
							 pcm_device->
							 stream_number);
		break;
	default:
		status = -EINVAL;
	}
	spin_unlock(&chip->reg_lock);
	return status;
}

/* playback pointer callback */
static snd_pcm_uframes_t snd_aw2_pcm_pointer_playback(struct snd_pcm_substream
						      *substream)
{
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	unsigned int current_ptr;

	/* get the current hardware pointer */
	struct snd_pcm_runtime *runtime = substream->runtime;
	current_ptr =
		snd_aw2_saa7146_get_hw_ptr_playback(&chip->saa7146,
						    pcm_device->stream_number,
						    runtime->dma_area,
						    runtime->buffer_size);

	return bytes_to_frames(substream->runtime, current_ptr);
}

/* capture pointer callback */
static snd_pcm_uframes_t snd_aw2_pcm_pointer_capture(struct snd_pcm_substream
						     *substream)
{
	struct aw2_pcm_device *pcm_device = snd_pcm_substream_chip(substream);
	struct aw2 *chip = pcm_device->chip;
	unsigned int current_ptr;

	/* get the current hardware pointer */
	struct snd_pcm_runtime *runtime = substream->runtime;
	current_ptr =
		snd_aw2_saa7146_get_hw_ptr_capture(&chip->saa7146,
						   pcm_device->stream_number,
						   runtime->dma_area,
						   runtime->buffer_size);

	return bytes_to_frames(substream->runtime, current_ptr);
}

/* create a pcm device */
static int snd_aw2_new_pcm(struct aw2 *chip)
{
	struct snd_pcm *pcm_playback_ana;
	struct snd_pcm *pcm_playback_num;
	struct snd_pcm *pcm_capture;
	struct aw2_pcm_device *pcm_device;
	int err = 0;

	/* Create new Alsa PCM device */

	err = snd_pcm_new(chip->card, "Audiowerk2 analog playback", 0, 1, 0,
			  &pcm_playback_ana);
	if (err < 0) {
		dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
		return err;
	}

	/* Creation ok */
	pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_ANA];

	/* Set PCM device name */
	strcpy(pcm_playback_ana->name, "Analog playback");
	/* Associate private data to PCM device */
	pcm_playback_ana->private_data = pcm_device;
	/* set operators of PCM device */
	snd_pcm_set_ops(pcm_playback_ana, SNDRV_PCM_STREAM_PLAYBACK,
			&snd_aw2_playback_ops);
	/* store PCM device */
	pcm_device->pcm = pcm_playback_ana;
	/* give base chip pointer to our internal pcm device
	   structure */
	pcm_device->chip = chip;
	/* Give stream number to PCM device */
	pcm_device->stream_number = NUM_STREAM_PLAYBACK_ANA;

	/* pre-allocation of buffers */
	/* Preallocate continuous pages. */
	err = snd_pcm_lib_preallocate_pages_for_all(pcm_playback_ana,
						    SNDRV_DMA_TYPE_DEV,
						    snd_dma_pci_data
						    (chip->pci),
						    64 * 1024, 64 * 1024);
	if (err)
		dev_err(chip->card->dev,
			"snd_pcm_lib_preallocate_pages_for_all error (0x%X)\n",
			err);

	err = snd_pcm_new(chip->card, "Audiowerk2 digital playback", 1, 1, 0,
			  &pcm_playback_num);

	if (err < 0) {
		dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
		return err;
	}
	/* Creation ok */
	pcm_device = &chip->device_playback[NUM_STREAM_PLAYBACK_DIG];

	/* Set PCM device name */
	strcpy(pcm_playback_num->name, "Digital playback");
	/* Associate private data to PCM device */
	pcm_playback_num->private_data = pcm_device;
	/* set operators of PCM device */
	snd_pcm_set_ops(pcm_playback_num, SNDRV_PCM_STREAM_PLAYBACK,
			&snd_aw2_playback_ops);
	/* store PCM device */
	pcm_device->pcm = pcm_playback_num;
	/* give base chip pointer to our internal pcm device
	   structure */
	pcm_device->chip = chip;
	/* Give stream number to PCM device */
	pcm_device->stream_number = NUM_STREAM_PLAYBACK_DIG;

	/* pre-allocation of buffers */
	/* Preallocate continuous pages. */
	err = snd_pcm_lib_preallocate_pages_for_all(pcm_playback_num,
						    SNDRV_DMA_TYPE_DEV,
						    snd_dma_pci_data
						    (chip->pci),
						    64 * 1024, 64 * 1024);
	if (err)
		dev_err(chip->card->dev,
			"snd_pcm_lib_preallocate_pages_for_all error (0x%X)\n",
			err);

	err = snd_pcm_new(chip->card, "Audiowerk2 capture", 2, 0, 1,
			  &pcm_capture);

	if (err < 0) {
		dev_err(chip->card->dev, "snd_pcm_new error (0x%X)\n", err);
		return err;
	}

	/* Creation ok */
	pcm_device = &chip->device_capture[NUM_STREAM_CAPTURE_ANA];

	/* Set PCM device name */
	strcpy(pcm_capture->name, "Capture");
	/* Associate private data to PCM device */
	pcm_capture->private_data = pcm_device;
	/* set operators of PCM device */
	snd_pcm_set_ops(pcm_capture, SNDRV_PCM_STREAM_CAPTURE,
			&snd_aw2_capture_ops);
	/* store PCM device */
	pcm_device->pcm = pcm_capture;
	/* give base chip pointer to our internal pcm device
	   structure */
	pcm_device->chip = chip;
	/* Give stream number to PCM device */
	pcm_device->stream_number = NUM_STREAM_CAPTURE_ANA;

	/* pre-allocation of buffers */
	/* Preallocate continuous pages. */
	err = snd_pcm_lib_preallocate_pages_for_all(pcm_capture,
						    SNDRV_DMA_TYPE_DEV,
						    snd_dma_pci_data
						    (chip->pci),
						    64 * 1024, 64 * 1024);
	if (err)
		dev_err(chip->card->dev,
			"snd_pcm_lib_preallocate_pages_for_all error (0x%X)\n",
			err);


	/* Create control */
	err = snd_ctl_add(chip->card, snd_ctl_new1(&aw2_control, chip));
	if (err < 0) {
		dev_err(chip->card->dev, "snd_ctl_add error (0x%X)\n", err);
		return err;
	}

	return 0;
}

static int snd_aw2_control_switch_capture_info(struct snd_kcontrol *kcontrol,
					       struct snd_ctl_elem_info *uinfo)
{
	static const char * const texts[2] = {
		"Analog", "Digital"
	};
	return snd_ctl_enum_info(uinfo, 1, 2, texts);
}

static int snd_aw2_control_switch_capture_get(struct snd_kcontrol *kcontrol,
					      struct snd_ctl_elem_value
					      *ucontrol)
{
	struct aw2 *chip = snd_kcontrol_chip(kcontrol);
	if (snd_aw2_saa7146_is_using_digital_input(&chip->saa7146))
		ucontrol->value.enumerated.item[0] = CTL_ROUTE_DIGITAL;
	else
		ucontrol->value.enumerated.item[0] = CTL_ROUTE_ANALOG;
	return 0;
}

static int snd_aw2_control_switch_capture_put(struct snd_kcontrol *kcontrol,
					      struct snd_ctl_elem_value
					      *ucontrol)
{
	struct aw2 *chip = snd_kcontrol_chip(kcontrol);
	int changed = 0;
	int is_disgital =
	    snd_aw2_saa7146_is_using_digital_input(&chip->saa7146);

	if (((ucontrol->value.integer.value[0] == CTL_ROUTE_DIGITAL)
	     && !is_disgital)
	    || ((ucontrol->value.integer.value[0] == CTL_ROUTE_ANALOG)
		&& is_disgital)) {
		snd_aw2_saa7146_use_digital_input(&chip->saa7146, !is_disgital);
		changed = 1;
	}
	return changed;
}