aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/cx25821/cx25821-alsa.c
blob: 1858a45dd081c2cbeae4b5dd1ce18745c6845f6c (plain) (blame)
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
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
/*
 *  Driver for the Conexant CX25821 PCIe bridge
 *
 *  Copyright (C) 2009 Conexant Systems Inc.
 *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
 *	Based on SAA713x ALSA driver and CX88 driver
 *
 *   This program 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
 *
 *   This program 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 this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
#include <linux/dma-mapping.h>
#include <linux/pci.h>
#include <linux/slab.h>

#include <linux/delay.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "cx25821.h"
#include "cx25821-reg.h"

#define AUDIO_SRAM_CHANNEL	SRAM_CH08

#define dprintk(level, fmt, arg...)				\
do {								\
	if (debug >= level)					\
		pr_info("%s/1: " fmt, chip->dev->name, ##arg);	\
} while (0)
#define dprintk_core(level, fmt, arg...)				\
do {									\
	if (debug >= level)						\
		printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name, ##arg); \
} while (0)

/****************************************************************************
	Data type declarations - Can be moded to a header file later
 ****************************************************************************/

static struct snd_card *snd_cx25821_cards[SNDRV_CARDS];
static int devno;

struct cx25821_audio_buffer {
	unsigned int bpl;
	struct btcx_riscmem risc;
	struct videobuf_dmabuf dma;
};

struct cx25821_audio_dev {
	struct cx25821_dev *dev;
	struct cx25821_dmaqueue q;

	/* pci i/o */
	struct pci_dev *pci;

	/* audio controls */
	int irq;

	struct snd_card *card;

	unsigned long iobase;
	spinlock_t reg_lock;
	atomic_t count;

	unsigned int dma_size;
	unsigned int period_size;
	unsigned int num_periods;

	struct videobuf_dmabuf *dma_risc;

	struct cx25821_audio_buffer *buf;

	struct snd_pcm_substream *substream;
};


/****************************************************************************
			Module global static vars
 ****************************************************************************/

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
static bool enable[SNDRV_CARDS] = { 1, [1 ... (SNDRV_CARDS - 1)] = 1 };

module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled.");

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s).");

/****************************************************************************
				Module macros
 ****************************************************************************/

MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
MODULE_AUTHOR("Hiep Huynh");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Conexant,25821}");	/* "{{Conexant,23881}," */

static unsigned int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable debug messages");

/****************************************************************************
			Module specific funtions
 ****************************************************************************/
/* Constants taken from cx88-reg.h */
#define AUD_INT_DN_RISCI1       (1 <<  0)
#define AUD_INT_UP_RISCI1       (1 <<  1)
#define AUD_INT_RDS_DN_RISCI1   (1 <<  2)
#define AUD_INT_DN_RISCI2       (1 <<  4)	/* yes, 3 is skipped */
#define AUD_INT_UP_RISCI2       (1 <<  5)
#define AUD_INT_RDS_DN_RISCI2   (1 <<  6)
#define AUD_INT_DN_SYNC         (1 << 12)
#define AUD_INT_UP_SYNC         (1 << 13)
#define AUD_INT_RDS_DN_SYNC     (1 << 14)
#define AUD_INT_OPC_ERR         (1 << 16)
#define AUD_INT_BER_IRQ         (1 << 20)
#define AUD_INT_MCHG_IRQ        (1 << 21)
#define GP_COUNT_CONTROL_RESET	0x3

#define PCI_MSK_AUD_EXT   (1 <<  4)
#define PCI_MSK_AUD_INT   (1 <<  3)
/*
 * BOARD Specific: Sets audio DMA
 */

static int _cx25821_start_audio_dma(struct cx25821_audio_dev *chip)
{
	struct cx25821_audio_buffer *buf = chip->buf;
	struct cx25821_dev *dev = chip->dev;
	struct sram_channel *audio_ch =
	    &cx25821_sram_channels[AUDIO_SRAM_CHANNEL];
	u32 tmp = 0;

	/* enable output on the GPIO 0 for the MCLK ADC (Audio) */
	cx25821_set_gpiopin_direction(chip->dev, 0, 0);

	/* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
	cx_clear(AUD_INT_DMA_CTL,
		 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);

	/* setup fifo + format - out channel */
	cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl,
					 buf->risc.dma);

	/* sets bpl size */
	cx_write(AUD_A_LNGTH, buf->bpl);

	/* reset counter */
	/* GP_COUNT_CONTROL_RESET = 0x3 */
	cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
	atomic_set(&chip->count, 0);

	/* Set the input mode to 16-bit */
	tmp = cx_read(AUD_A_CFG);
	cx_write(AUD_A_CFG, tmp | FLD_AUD_DST_PK_MODE | FLD_AUD_DST_ENABLE |
		 FLD_AUD_CLK_ENABLE);

	/*
	pr_info("DEBUG: Start audio DMA, %d B/line, cmds_start(0x%x)= %d lines/FIFO, %d periods, %d byte buffer\n",
		buf->bpl, audio_ch->cmds_start,
		cx_read(audio_ch->cmds_start + 12)>>1,
		chip->num_periods, buf->bpl * chip->num_periods);
	*/

	/* Enables corresponding bits at AUD_INT_STAT */
	cx_write(AUD_A_INT_MSK, FLD_AUD_DST_RISCI1 | FLD_AUD_DST_OF |
		 FLD_AUD_DST_SYNC | FLD_AUD_DST_OPC_ERR);

	/* Clean any pending interrupt bits already set */
	cx_write(AUD_A_INT_STAT, ~0);

	/* enable audio irqs */
	cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);

	/* Turn on audio downstream fifo and risc enable 0x101 */
	tmp = cx_read(AUD_INT_DMA_CTL);
	cx_set(AUD_INT_DMA_CTL, tmp |
	       (FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN));

	mdelay(100);
	return 0;
}

/*
 * BOARD Specific: Resets audio DMA
 */
static int _cx25821_stop_audio_dma(struct cx25821_audio_dev *chip)
{
	struct cx25821_dev *dev = chip->dev;

	/* stop dma */
	cx_clear(AUD_INT_DMA_CTL,
		 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);

	/* disable irqs */
	cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
	cx_clear(AUD_A_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
		 AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);

	return 0;
}

#define MAX_IRQ_LOOP 50

/*
 * BOARD Specific: IRQ dma bits
 */
static char *cx25821_aud_irqs[32] = {
	"dn_risci1", "up_risci1", "rds_dn_risc1",	/* 0-2 */
	NULL,						/* reserved */
	"dn_risci2", "up_risci2", "rds_dn_risc2",	/* 4-6 */
	NULL,						/* reserved */
	"dnf_of", "upf_uf", "rds_dnf_uf",		/* 8-10 */
	NULL,						/* reserved */
	"dn_sync", "up_sync", "rds_dn_sync",		/* 12-14 */
	NULL,						/* reserved */
	"opc_err", "par_err", "rip_err",		/* 16-18 */
	"pci_abort", "ber_irq", "mchg_irq"		/* 19-21 */
};

/*
 * BOARD Specific: Threats IRQ audio specific calls
 */
static void cx25821_aud_irq(struct cx25821_audio_dev *chip, u32 status,
			    u32 mask)
{
	struct cx25821_dev *dev = chip->dev;

	if (0 == (status & mask))
		return;

	cx_write(AUD_A_INT_STAT, status);
	if (debug > 1 || (status & mask & ~0xff))
		cx25821_print_irqbits(dev->name, "irq aud", cx25821_aud_irqs,
				ARRAY_SIZE(cx25821_aud_irqs), status, mask);

	/* risc op code error */
	if (status & AUD_INT_OPC_ERR) {
		pr_warn("WARNING %s/1: Audio risc op code error\n", dev->name);

		cx_clear(AUD_INT_DMA_CTL,
			 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
		cx25821_sram_channel_dump_audio(dev,
				&cx25821_sram_channels[AUDIO_SRAM_CHANNEL]);
	}
	if (status & AUD_INT_DN_SYNC) {
		pr_warn("WARNING %s: Downstream sync error!\n", dev->name);
		cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
		return;
	}

	/* risc1 downstream */
	if (status & AUD_INT_DN_RISCI1) {
		atomic_set(&chip->count, cx_read(AUD_A_GPCNT));
		snd_pcm_period_elapsed(chip->substream);
	}
}

/*
 * BOARD Specific: Handles IRQ calls
 */
static irqreturn_t cx25821_irq(int irq, void *dev_id)
{
	struct cx25821_audio_dev *chip = dev_id;
	struct cx25821_dev *dev = chip->dev;
	u32 status, pci_status;
	u32 audint_status, audint_mask;
	int loop, handled = 0;

	audint_status = cx_read(AUD_A_INT_STAT);
	audint_mask = cx_read(AUD_A_INT_MSK);
	status = cx_read(PCI_INT_STAT);

	for (loop = 0; loop < 1; loop++) {
		status = cx_read(PCI_INT_STAT);
		if (0 == status) {
			status = cx_read(PCI_INT_STAT);
			audint_status = cx_read(AUD_A_INT_STAT);
			audint_mask = cx_read(AUD_A_INT_MSK);

			if (status) {
				handled = 1;
				cx_write(PCI_INT_STAT, status);

				cx25821_aud_irq(chip, audint_status,
						audint_mask);
				break;
			} else {
				goto out;
			}
		}

		handled = 1;
		cx_write(PCI_INT_STAT, status);

		cx25821_aud_irq(chip, audint_status, audint_mask);
	}

	pci_status = cx_read(PCI_INT_STAT);

	if (handled)
		cx_write(PCI_INT_STAT, pci_status);

out:
	return IRQ_RETVAL(handled);
}

static int dsp_buffer_free(struct cx25821_audio_dev *chip)
{
	BUG_ON(!chip->dma_size);

	dprintk(2, "Freeing buffer\n");
	videobuf_dma_unmap(&chip->pci->dev, chip->dma_risc);
	videobuf_dma_free(chip->dma_risc);
	btcx_riscmem_free(chip->pci, &chip->buf->risc);
	kfree(chip->buf);

	chip->dma_risc = NULL;
	chip->dma_size = 0;

	return 0;
}

/****************************************************************************
				ALSA PCM Interface
 ****************************************************************************/

/*
 * Digital hardware definition
 */
#define DEFAULT_FIFO_SIZE	384
static struct snd_pcm_hardware snd_cx25821_digital_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_48000,
	.rate_min = 48000,
	.rate_max = 48000,
	.channels_min = 2,
	.channels_max = 2,
	/* Analog audio output will be full of clicks and pops if there
	   are not exactly four lines in the SRAM FIFO buffer.  */
	.period_bytes_min = DEFAULT_FIFO_SIZE / 3,
	.period_bytes_max = DEFAULT_FIFO_SIZE / 3,
	.periods_min = 1,
	.periods_max = AUDIO_LINE_SIZE,
	/* 128 * 128 = 16384 = 1024 * 16 */
	.buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE),
};

/*
 * audio pcm capture open callback
 */
static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream)
{
	struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;
	unsigned int bpl = 0;

	if (!chip) {
		pr_err("DEBUG: cx25821 can't find device struct. Can't proceed with open\n");
		return -ENODEV;
	}

	err = snd_pcm_hw_constraint_pow2(runtime, 0,
					 SNDRV_PCM_HW_PARAM_PERIODS);
	if (err < 0)
		goto _error;

	chip->substream = substream;

	runtime->hw = snd_cx25821_digital_hw;

	if (cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
	    DEFAULT_FIFO_SIZE) {
		/* since there are 3 audio Clusters */
		bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3;
		bpl &= ~7;	/* must be multiple of 8 */

		if (bpl > AUDIO_LINE_SIZE)
			bpl = AUDIO_LINE_SIZE;

		runtime->hw.period_bytes_min = bpl;
		runtime->hw.period_bytes_max = bpl;
	}

	return 0;
_error:
	dprintk(1, "Error opening PCM!\n");
	return err;
}

/*
 * audio close callback
 */
static int snd_cx25821_close(struct snd_pcm_substream *substream)
{
	return 0;
}

/*
 * hw_params callback
 */
static int snd_cx25821_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *hw_params)
{
	struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
	struct videobuf_dmabuf *dma;

	struct cx25821_audio_buffer *buf;
	int ret;

	if (substream->runtime->dma_area) {
		dsp_buffer_free(chip);
		substream->runtime->dma_area = NULL;
	}

	chip->period_size = params_period_bytes(hw_params);
	chip->num_periods = params_periods(hw_params);
	chip->dma_size = chip->period_size * params_periods(hw_params);

	BUG_ON(!chip->dma_size);
	BUG_ON(chip->num_periods & (chip->num_periods - 1));

	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
	if (NULL == buf)
		return -ENOMEM;

	if (chip->period_size > AUDIO_LINE_SIZE)
		chip->period_size = AUDIO_LINE_SIZE;

	buf->bpl = chip->period_size;

	dma = &buf->dma;
	videobuf_dma_init(dma);
	ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE,
			(PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
	if (ret < 0)
		goto error;

	ret = videobuf_dma_map(&chip->pci->dev, dma);
	if (ret < 0)
		goto error;

	ret = cx25821_risc_databuffer_audio(chip->pci, &buf->risc, dma->sglist,
			chip->period_size, chip->num_periods, 1);
	if (ret < 0) {
		pr_info("DEBUG: ERROR after cx25821_risc_databuffer_audio()\n");
		goto error;
	}

	/* Loop back to start of program */
	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
	buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
	buf->risc.jmp[2] = cpu_to_le32(0);	/* bits 63-32 */

	chip->buf = buf;
	chip->dma_risc = dma;

	substream->runtime->dma_area = chip->dma_risc->vaddr;
	substream->runtime->dma_bytes = chip->dma_size;
	substream->runtime->dma_addr = 0;

	return 0;

error:
	kfree(buf);
	return ret;
}

/*
 * hw free callback
 */
static int snd_cx25821_hw_free(struct snd_pcm_substream *substream)
{
	struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);

	if (substream->runtime->dma_area) {
		dsp_buffer_free(chip);
		substream->runtime->dma_area = NULL;
	}

	return 0;
}

/*
 * prepare callback
 */
static int snd_cx25821_prepare(struct snd_pcm_substream *substream)
{
	return 0;
}

/*
 * trigger callback
 */
static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream,
				    int cmd)
{
	struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
	int err = 0;

	/* Local interrupts are already disabled by ALSA */
	spin_lock(&chip->reg_lock);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		err = _cx25821_start_audio_dma(chip);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		err = _cx25821_stop_audio_dma(chip);
		break;
	default:
		err = -EINVAL;
		break;
	}

	spin_unlock(&chip->reg_lock);

	return err;
}

/*
 * pointer callback
 */
static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream
					     *substream)
{
	struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	u16 count;

	count = atomic_read(&chip->count);

	return runtime->period_size * (count & (runtime->periods - 1));
}

/*
 * page callback (needed for mmap)
 */
static struct page *snd_cx25821_page(struct snd_pcm_substream *substream,
				     unsigned long offset)
{
	void *pageptr = substream->runtime->dma_area + offset;

	return vmalloc_to_page(pageptr);
}

/*
 * operators
 */
static struct snd_pcm_ops snd_cx25821_pcm_ops = {
	.open = snd_cx25821_pcm_open,
	.close = snd_cx25821_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_cx25821_hw_params,
	.hw_free = snd_cx25821_hw_free,
	.prepare = snd_cx25821_prepare,
	.trigger = snd_cx25821_card_trigger,
	.pointer = snd_cx25821_pointer,
	.page = snd_cx25821_page,
};

/*
 * ALSA create a PCM device:  Called when initializing the board.
 * Sets up the name and hooks up the callbacks
 */
static int snd_cx25821_pcm(struct cx25821_audio_dev *chip, int device,
			   char *name)
{
	struct snd_pcm *pcm;
	int err;

	err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
	if (err < 0) {
		pr_info("ERROR: FAILED snd_pcm_new() in %s\n", __func__);
		return err;
	}
	pcm->private_data = chip;
	pcm->info_flags = 0;
	strcpy(pcm->name, name);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops);

	return 0;
}

/****************************************************************************
			Basic Flow for Sound Devices
 ****************************************************************************/

/*
 * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio
 * Only boards with eeprom and byte 1 at eeprom=1 have it
 */

static DEFINE_PCI_DEVICE_TABLE(cx25821_audio_pci_tbl) = {
	{0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{0,}
};

MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);

/*
 * Not used in the function snd_cx25821_dev_free so removing
 * from the file.
 */
/*
static int snd_cx25821_free(struct cx25821_audio_dev *chip)
{
	if (chip->irq >= 0)
		free_irq(chip->irq, chip);

	cx25821_dev_unregister(chip->dev);
	pci_disable_device(chip->pci);

	return 0;
}
*/

/*
 * Component Destructor
 */
static void snd_cx25821_dev_free(struct snd_card *card)
{
	struct cx25821_audio_dev *chip = card->private_data;

	/* snd_cx25821_free(chip); */
	snd_card_free(chip->card);
}

/*
 * Alsa Constructor - Component probe
 */
static int cx25821_audio_initdev(struct cx25821_dev *dev)
{
	struct snd_card *card;
	struct cx25821_audio_dev *chip;
	int err;

	if (devno >= SNDRV_CARDS) {
		pr_info("DEBUG ERROR: devno >= SNDRV_CARDS %s\n", __func__);
		return -ENODEV;
	}

	if (!enable[devno]) {
		++devno;
		pr_info("DEBUG ERROR: !enable[devno] %s\n", __func__);
		return -ENOENT;
	}

	err = snd_card_create(index[devno], id[devno], THIS_MODULE,
			sizeof(struct cx25821_audio_dev), &card);
	if (err < 0) {
		pr_info("DEBUG ERROR: cannot create snd_card_new in %s\n",
			__func__);
		return err;
	}

	strcpy(card->driver, "cx25821");

	/* Card "creation" */
	card->private_free = snd_cx25821_dev_free;
	chip = card->private_data;
	spin_lock_init(&chip->reg_lock);

	chip->dev = dev;
	chip->card = card;
	chip->pci = dev->pci;
	chip->iobase = pci_resource_start(dev->pci, 0);

	chip->irq = dev->pci->irq;

	err = request_irq(dev->pci->irq, cx25821_irq,
			  IRQF_SHARED, chip->dev->name, chip);

	if (err < 0) {
		pr_err("ERROR %s: can't get IRQ %d for ALSA\n", chip->dev->name,
			dev->pci->irq);
		goto error;
	}

	err = snd_cx25821_pcm(chip, 0, "cx25821 Digital");
	if (err < 0) {
		pr_info("DEBUG ERROR: cannot create snd_cx25821_pcm %s\n",
			__func__);
		goto error;
	}

	snd_card_set_dev(card, &chip->pci->dev);

	strcpy(card->shortname, "cx25821");
	sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name,
		chip->iobase, chip->irq);
	strcpy(card->mixername, "CX25821");

	pr_info("%s/%i: ALSA support for cx25821 boards\n", card->driver,
		devno);

	err = snd_card_register(card);
	if (err < 0) {
		pr_info("DEBUG ERROR: cannot register sound card %s\n",
			__func__);
		goto error;
	}

	snd_cx25821_cards[devno] = card;

	devno++;
	return 0;

error:
	snd_card_free(card);
	return err;
}

/****************************************************************************
				LINUX MODULE INIT
 ****************************************************************************/
static void cx25821_audio_fini(void)
{
	snd_card_free(snd_cx25821_cards[0]);
}

/*
 * Module initializer
 *
 * Loops through present saa7134 cards, and assigns an ALSA device
 * to each one
 *
 */
static int cx25821_alsa_init(void)
{
	struct cx25821_dev *dev = NULL;
	struct list_head *list;

	mutex_lock(&cx25821_devlist_mutex);
	list_for_each(list, &cx25821_devlist) {
		dev = list_entry(list, struct cx25821_dev, devlist);
		cx25821_audio_initdev(dev);
	}
	mutex_unlock(&cx25821_devlist_mutex);

	if (dev == NULL)
		pr_info("ERROR ALSA: no cx25821 cards found\n");

	return 0;

}

late_initcall(cx25821_alsa_init);
module_exit(cx25821_audio_fini);

/* ----------------------------------------------------------- */
/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */