summaryrefslogtreecommitdiffstats
path: root/sound/isa/ad1848/ad1848_lib.c
blob: 21536b7de608025400d7701a56e2d4cbcf004fe6 (plain)
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
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *  Routines for control of AD1848/AD1847/CS4248
 *
 *
 *   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; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   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 SNDRV_MAIN_OBJECT_FILE
#include <sound/driver.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <sound/core.h>
#include <sound/ad1848.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include <sound/pcm_params.h>

#include <asm/io.h>
#include <asm/dma.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
MODULE_DESCRIPTION("Routines for control of AD1848/AD1847/CS4248");
MODULE_LICENSE("GPL");

#if 0
#define SNDRV_DEBUG_MCE
#endif

/*
 *  Some variables
 */

static unsigned char freq_bits[14] = {
	/* 5510 */	0x00 | AD1848_XTAL2,
	/* 6620 */	0x0E | AD1848_XTAL2,
	/* 8000 */	0x00 | AD1848_XTAL1,
	/* 9600 */	0x0E | AD1848_XTAL1,
	/* 11025 */	0x02 | AD1848_XTAL2,
	/* 16000 */	0x02 | AD1848_XTAL1,
	/* 18900 */	0x04 | AD1848_XTAL2,
	/* 22050 */	0x06 | AD1848_XTAL2,
	/* 27042 */	0x04 | AD1848_XTAL1,
	/* 32000 */	0x06 | AD1848_XTAL1,
	/* 33075 */	0x0C | AD1848_XTAL2,
	/* 37800 */	0x08 | AD1848_XTAL2,
	/* 44100 */	0x0A | AD1848_XTAL2,
	/* 48000 */	0x0C | AD1848_XTAL1
};

static unsigned int rates[14] = {
	5510, 6620, 8000, 9600, 11025, 16000, 18900, 22050,
	27042, 32000, 33075, 37800, 44100, 48000
};

static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
	.count = ARRAY_SIZE(rates),
	.list = rates,
	.mask = 0,
};

static unsigned char snd_ad1848_original_image[16] =
{
	0x00,			/* 00 - lic */
	0x00,			/* 01 - ric */
	0x9f,			/* 02 - la1ic */
	0x9f,			/* 03 - ra1ic */
	0x9f,			/* 04 - la2ic */
	0x9f,			/* 05 - ra2ic */
	0xbf,			/* 06 - loc */
	0xbf,			/* 07 - roc */
	0x20,			/* 08 - dfr */
	AD1848_AUTOCALIB,	/* 09 - ic */
	0x00,			/* 0a - pc */
	0x00,			/* 0b - ti */
	0x00,			/* 0c - mi */
	0x00,			/* 0d - lbc */
	0x00,			/* 0e - dru */
	0x00,			/* 0f - drl */
};

/*
 *  Basic I/O functions
 */

static void snd_ad1848_wait(struct snd_ad1848 *chip)
{
	int timeout;

	for (timeout = 250; timeout > 0; timeout--) {
		if ((inb(AD1848P(chip, REGSEL)) & AD1848_INIT) == 0)
			break;
		udelay(100);
	}
}

void snd_ad1848_out(struct snd_ad1848 *chip,
			   unsigned char reg,
			   unsigned char value)
{
	snd_ad1848_wait(chip);
#ifdef CONFIG_SND_DEBUG
	if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
		snd_printk(KERN_WARNING "auto calibration time out - "
			   "reg = 0x%x, value = 0x%x\n", reg, value);
#endif
	outb(chip->mce_bit | reg, AD1848P(chip, REGSEL));
	outb(chip->image[reg] = value, AD1848P(chip, REG));
	mb();
	snd_printdd("codec out - reg 0x%x = 0x%x\n",
			chip->mce_bit | reg, value);
}

EXPORT_SYMBOL(snd_ad1848_out);

static void snd_ad1848_dout(struct snd_ad1848 *chip,
			    unsigned char reg, unsigned char value)
{
	snd_ad1848_wait(chip);
	outb(chip->mce_bit | reg, AD1848P(chip, REGSEL));
	outb(value, AD1848P(chip, REG));
	mb();
}

static unsigned char snd_ad1848_in(struct snd_ad1848 *chip, unsigned char reg)
{
	snd_ad1848_wait(chip);
#ifdef CONFIG_SND_DEBUG
	if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
		snd_printk(KERN_WARNING "auto calibration time out - "
			   "reg = 0x%x\n", reg);
#endif
	outb(chip->mce_bit | reg, AD1848P(chip, REGSEL));
	mb();
	return inb(AD1848P(chip, REG));
}

#if 0

static void snd_ad1848_debug(struct snd_ad1848 *chip)
{
	printk("AD1848 REGS:      INDEX = 0x%02x  ", inb(AD1848P(chip, REGSEL)));
	printk("                 STATUS = 0x%02x\n", inb(AD1848P(chip, STATUS)));
	printk("  0x00: left input      = 0x%02x  ", snd_ad1848_in(chip, 0x00));
	printk("  0x08: playback format = 0x%02x\n", snd_ad1848_in(chip, 0x08));
	printk("  0x01: right input     = 0x%02x  ", snd_ad1848_in(chip, 0x01));
	printk("  0x09: iface (CFIG 1)  = 0x%02x\n", snd_ad1848_in(chip, 0x09));
	printk("  0x02: AUXA left       = 0x%02x  ", snd_ad1848_in(chip, 0x02));
	printk("  0x0a: pin control     = 0x%02x\n", snd_ad1848_in(chip, 0x0a));
	printk("  0x03: AUXA right      = 0x%02x  ", snd_ad1848_in(chip, 0x03));
	printk("  0x0b: init & status   = 0x%02x\n", snd_ad1848_in(chip, 0x0b));
	printk("  0x04: AUXB left       = 0x%02x  ", snd_ad1848_in(chip, 0x04));
	printk("  0x0c: revision & mode = 0x%02x\n", snd_ad1848_in(chip, 0x0c));
	printk("  0x05: AUXB right      = 0x%02x  ", snd_ad1848_in(chip, 0x05));
	printk("  0x0d: loopback        = 0x%02x\n", snd_ad1848_in(chip, 0x0d));
	printk("  0x06: left output     = 0x%02x  ", snd_ad1848_in(chip, 0x06));
	printk("  0x0e: data upr count  = 0x%02x\n", snd_ad1848_in(chip, 0x0e));
	printk("  0x07: right output    = 0x%02x  ", snd_ad1848_in(chip, 0x07));
	printk("  0x0f: data lwr count  = 0x%02x\n", snd_ad1848_in(chip, 0x0f));
}

#endif

/*
 *  AD1848 detection / MCE routines
 */

static void snd_ad1848_mce_up(struct snd_ad1848 *chip)
{
	unsigned long flags;
	int timeout;

	snd_ad1848_wait(chip);
#ifdef CONFIG_SND_DEBUG
	if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
		snd_printk(KERN_WARNING "mce_up - auto calibration time out (0)\n");
#endif
	spin_lock_irqsave(&chip->reg_lock, flags);
	chip->mce_bit |= AD1848_MCE;
	timeout = inb(AD1848P(chip, REGSEL));
	if (timeout == 0x80)
		snd_printk(KERN_WARNING "mce_up [0x%lx]: serious init problem - codec still busy\n", chip->port);
	if (!(timeout & AD1848_MCE))
		outb(chip->mce_bit | (timeout & 0x1f), AD1848P(chip, REGSEL));
	spin_unlock_irqrestore(&chip->reg_lock, flags);
}

static void snd_ad1848_mce_down(struct snd_ad1848 *chip)
{
	unsigned long flags, timeout;
	int reg;

	spin_lock_irqsave(&chip->reg_lock, flags);
	for (timeout = 5; timeout > 0; timeout--)
		inb(AD1848P(chip, REGSEL));
	/* end of cleanup sequence */
	for (timeout = 12000; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--)
		udelay(100);

	snd_printdd("(1) timeout = %d\n", timeout);

#ifdef CONFIG_SND_DEBUG
	if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
		snd_printk(KERN_WARNING "mce_down [0x%lx] - auto calibration time out (0)\n", AD1848P(chip, REGSEL));
#endif

	chip->mce_bit &= ~AD1848_MCE;
	reg = inb(AD1848P(chip, REGSEL));
	outb(chip->mce_bit | (reg & 0x1f), AD1848P(chip, REGSEL));
	if (reg == 0x80)
		snd_printk(KERN_WARNING "mce_down [0x%lx]: serious init problem - codec still busy\n", chip->port);
	if ((reg & AD1848_MCE) == 0) {
		spin_unlock_irqrestore(&chip->reg_lock, flags);
		return;
	}

	/*
	 * Wait for auto-calibration (AC) process to finish, i.e. ACI to go low.
	 * It may take up to 5 sample periods (at most 907 us @ 5.5125 kHz) for
	 * the process to _start_, so it is important to wait at least that long
	 * before checking.  Otherwise we might think AC has finished when it
	 * has in fact not begun.  It could take 128 (no AC) or 384 (AC) cycles
	 * for ACI to drop.  This gives a wait of at most 70 ms with a more
	 * typical value of 3-9 ms.
	 */
	timeout = jiffies + msecs_to_jiffies(250);
	do {
		spin_unlock_irqrestore(&chip->reg_lock, flags);
		msleep(1);
		spin_lock_irqsave(&chip->reg_lock, flags);
		reg = snd_ad1848_in(chip, AD1848_TEST_INIT) &
		      AD1848_CALIB_IN_PROGRESS;
	} while (reg && time_before(jiffies, timeout));
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	if (reg)
		snd_printk(KERN_ERR
			   "mce_down - auto calibration time out (2)\n");

	snd_printdd("(4) jiffies = %lu\n", jiffies);
	snd_printd("mce_down - exit = 0x%x\n", inb(AD1848P(chip, REGSEL)));
}

static unsigned int snd_ad1848_get_count(unsigned char format,
				         unsigned int size)
{
	switch (format & 0xe0) {
	case AD1848_LINEAR_16:
		size >>= 1;
		break;
	}
	if (format & AD1848_STEREO)
		size >>= 1;
	return size;
}

static int snd_ad1848_trigger(struct snd_ad1848 *chip, unsigned char what,
			      int channel, int cmd)
{
	int result = 0;

#if 0
	printk("codec trigger!!! - what = %i, enable = %i, status = 0x%x\n", what, enable, inb(AD1848P(card, STATUS)));
#endif
	spin_lock(&chip->reg_lock);
	if (cmd == SNDRV_PCM_TRIGGER_START) {
		if (chip->image[AD1848_IFACE_CTRL] & what) {
			spin_unlock(&chip->reg_lock);
			return 0;
		}
		snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL] |= what);
		chip->mode |= AD1848_MODE_RUNNING;
	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
		if (!(chip->image[AD1848_IFACE_CTRL] & what)) {
			spin_unlock(&chip->reg_lock);
			return 0;
		}
		snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL] &= ~what);
		chip->mode &= ~AD1848_MODE_RUNNING;
	} else {
		result = -EINVAL;
	}
	spin_unlock(&chip->reg_lock);
	return result;
}

/*
 *  CODEC I/O
 */

static unsigned char snd_ad1848_get_rate(unsigned int rate)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(rates); i++)
		if (rate == rates[i])
			return freq_bits[i];
	snd_BUG();
	return freq_bits[ARRAY_SIZE(rates) - 1];
}

static int snd_ad1848_ioctl(struct snd_pcm_substream *substream,
			    unsigned int cmd, void *arg)
{
	return snd_pcm_lib_ioctl(substream, cmd, arg);
}

static unsigned char snd_ad1848_get_format(int format, int channels)
{
	unsigned char rformat;

	rformat = AD1848_LINEAR_8;
	switch (format) {
	case SNDRV_PCM_FORMAT_A_LAW:	rformat = AD1848_ALAW_8; break;
	case SNDRV_PCM_FORMAT_MU_LAW:	rformat = AD1848_ULAW_8; break;
	case SNDRV_PCM_FORMAT_S16_LE:	rformat = AD1848_LINEAR_16; break;
	}
	if (channels > 1)
		rformat |= AD1848_STEREO;
#if 0
	snd_printk("get_format: 0x%x (mode=0x%x)\n", format, mode);
#endif
	return rformat;
}

static void snd_ad1848_calibrate_mute(struct snd_ad1848 *chip, int mute)
{
	unsigned long flags;
	
	mute = mute ? 1 : 0;
	spin_lock_irqsave(&chip->reg_lock, flags);
	if (chip->calibrate_mute == mute) {
		spin_unlock_irqrestore(&chip->reg_lock, flags);
		return;
	}
	if (!mute) {
		snd_ad1848_dout(chip, AD1848_LEFT_INPUT, chip->image[AD1848_LEFT_INPUT]);
		snd_ad1848_dout(chip, AD1848_RIGHT_INPUT, chip->image[AD1848_RIGHT_INPUT]);
	}
	snd_ad1848_dout(chip, AD1848_AUX1_LEFT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX1_LEFT_INPUT]);
	snd_ad1848_dout(chip, AD1848_AUX1_RIGHT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX1_RIGHT_INPUT]);
	snd_ad1848_dout(chip, AD1848_AUX2_LEFT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX2_LEFT_INPUT]);
	snd_ad1848_dout(chip, AD1848_AUX2_RIGHT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX2_RIGHT_INPUT]);
	snd_ad1848_dout(chip, AD1848_LEFT_OUTPUT, mute ? 0x80 : chip->image[AD1848_LEFT_OUTPUT]);
	snd_ad1848_dout(chip, AD1848_RIGHT_OUTPUT, mute ? 0x80 : chip->image[AD1848_RIGHT_OUTPUT]);
	chip->calibrate_mute = mute;
	spin_unlock_irqrestore(&chip->reg_lock, flags);
}

static void snd_ad1848_set_data_format(struct snd_ad1848 *chip, struct snd_pcm_hw_params *hw_params)
{
	if (hw_params == NULL) {
		chip->image[AD1848_DATA_FORMAT] = 0x20;
	} else {
		chip->image[AD1848_DATA_FORMAT] =
		    snd_ad1848_get_format(params_format(hw_params), params_channels(hw_params)) |
		    snd_ad1848_get_rate(params_rate(hw_params));
	}
	// snd_printk(">>> pmode = 0x%x, dfr = 0x%x\n", pstr->mode, chip->image[AD1848_DATA_FORMAT]);
}

static int snd_ad1848_open(struct snd_ad1848 *chip, unsigned int mode)
{
	unsigned long flags;

	mutex_lock(&chip->open_mutex);
	if (chip->mode & AD1848_MODE_OPEN) {
		mutex_unlock(&chip->open_mutex);
		return -EAGAIN;
	}
	snd_ad1848_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
	snd_printk("open: (1)\n");
#endif
	snd_ad1848_mce_up(chip);
	spin_lock_irqsave(&chip->reg_lock, flags);
	chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO |
			     AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO |
			     AD1848_CALIB_MODE);
	chip->image[AD1848_IFACE_CTRL] |= AD1848_AUTOCALIB;
	snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_ad1848_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
	snd_printk("open: (2)\n");
#endif

	snd_ad1848_set_data_format(chip, NULL);

	snd_ad1848_mce_up(chip);
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_ad1848_mce_down(chip);

#ifdef SNDRV_DEBUG_MCE
	snd_printk("open: (3)\n");
#endif

	/* ok. now enable and ack CODEC IRQ */
	spin_lock_irqsave(&chip->reg_lock, flags);
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	chip->image[AD1848_PIN_CTRL] |= AD1848_IRQ_ENABLE;
	snd_ad1848_out(chip, AD1848_PIN_CTRL, chip->image[AD1848_PIN_CTRL]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	chip->mode = mode;
	mutex_unlock(&chip->open_mutex);

	return 0;
}

static void snd_ad1848_close(struct snd_ad1848 *chip)
{
	unsigned long flags;

	mutex_lock(&chip->open_mutex);
	if (!chip->mode) {
		mutex_unlock(&chip->open_mutex);
		return;
	}
	/* disable IRQ */
	spin_lock_irqsave(&chip->reg_lock, flags);
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	chip->image[AD1848_PIN_CTRL] &= ~AD1848_IRQ_ENABLE;
	snd_ad1848_out(chip, AD1848_PIN_CTRL, chip->image[AD1848_PIN_CTRL]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	/* now disable capture & playback */

	snd_ad1848_mce_up(chip);
	spin_lock_irqsave(&chip->reg_lock, flags);
	chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO |
			     AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO);
	snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_ad1848_mce_down(chip);

	/* clear IRQ again */
	spin_lock_irqsave(&chip->reg_lock, flags);
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	chip->mode = 0;
	mutex_unlock(&chip->open_mutex);
}

/*
 *  ok.. exported functions..
 */

static int snd_ad1848_playback_trigger(struct snd_pcm_substream *substream,
				       int cmd)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
	return snd_ad1848_trigger(chip, AD1848_PLAYBACK_ENABLE, SNDRV_PCM_STREAM_PLAYBACK, cmd);
}

static int snd_ad1848_capture_trigger(struct snd_pcm_substream *substream,
				      int cmd)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
	return snd_ad1848_trigger(chip, AD1848_CAPTURE_ENABLE, SNDRV_PCM_STREAM_CAPTURE, cmd);
}

static int snd_ad1848_playback_hw_params(struct snd_pcm_substream *substream,
					 struct snd_pcm_hw_params *hw_params)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
	unsigned long flags;
	int err;

	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
		return err;
	snd_ad1848_calibrate_mute(chip, 1);
	snd_ad1848_set_data_format(chip, hw_params);
	snd_ad1848_mce_up(chip);
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_ad1848_mce_down(chip);
	snd_ad1848_calibrate_mute(chip, 0);
	return 0;
}

static int snd_ad1848_playback_hw_free(struct snd_pcm_substream *substream)
{
	return snd_pcm_lib_free_pages(substream);
}

static int snd_ad1848_playback_prepare(struct snd_pcm_substream *substream)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long flags;
	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);

	chip->dma_size = size;
	chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO);
	snd_dma_program(chip->dma, runtime->dma_addr, size, DMA_MODE_WRITE | DMA_AUTOINIT);
	count = snd_ad1848_get_count(chip->image[AD1848_DATA_FORMAT], count) - 1;
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_ad1848_out(chip, AD1848_DATA_LWR_CNT, (unsigned char) count);
	snd_ad1848_out(chip, AD1848_DATA_UPR_CNT, (unsigned char) (count >> 8));
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return 0;
}

static int snd_ad1848_capture_hw_params(struct snd_pcm_substream *substream,
					struct snd_pcm_hw_params *hw_params)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
	unsigned long flags;
	int err;

	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
		return err;
	snd_ad1848_calibrate_mute(chip, 1);
	snd_ad1848_set_data_format(chip, hw_params);
	snd_ad1848_mce_up(chip);
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_ad1848_mce_down(chip);
	snd_ad1848_calibrate_mute(chip, 0);
	return 0;
}

static int snd_ad1848_capture_hw_free(struct snd_pcm_substream *substream)
{
	return snd_pcm_lib_free_pages(substream);
}

static int snd_ad1848_capture_prepare(struct snd_pcm_substream *substream)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long flags;
	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);

	chip->dma_size = size;
	chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO);
	snd_dma_program(chip->dma, runtime->dma_addr, size, DMA_MODE_READ | DMA_AUTOINIT);
	count = snd_ad1848_get_count(chip->image[AD1848_DATA_FORMAT], count) - 1;
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_ad1848_out(chip, AD1848_DATA_LWR_CNT, (unsigned char) count);
	snd_ad1848_out(chip, AD1848_DATA_UPR_CNT, (unsigned char) (count >> 8));
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return 0;
}

static irqreturn_t snd_ad1848_interrupt(int irq, void *dev_id)
{
	struct snd_ad1848 *chip = dev_id;

	if ((chip->mode & AD1848_MODE_PLAY) && chip->playback_substream &&
	    (chip->mode & AD1848_MODE_RUNNING))
		snd_pcm_period_elapsed(chip->playback_substream);
	if ((chip->mode & AD1848_MODE_CAPTURE) && chip->capture_substream &&
	    (chip->mode & AD1848_MODE_RUNNING))
		snd_pcm_period_elapsed(chip->capture_substream);
	outb(0, AD1848P(chip, STATUS));	/* clear global interrupt bit */
	return IRQ_HANDLED;
}

static snd_pcm_uframes_t snd_ad1848_playback_pointer(struct snd_pcm_substream *substream)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
	size_t ptr;
	
	if (!(chip->image[AD1848_IFACE_CTRL] & AD1848_PLAYBACK_ENABLE))
		return 0;
	ptr = snd_dma_pointer(chip->dma, chip->dma_size);
	return bytes_to_frames(substream->runtime, ptr);
}

static snd_pcm_uframes_t snd_ad1848_capture_pointer(struct snd_pcm_substream *substream)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
	size_t ptr;

	if (!(chip->image[AD1848_IFACE_CTRL] & AD1848_CAPTURE_ENABLE))
		return 0;
	ptr = snd_dma_pointer(chip->dma, chip->dma_size);
	return bytes_to_frames(substream->runtime, ptr);
}

/*

 */

static void snd_ad1848_thinkpad_twiddle(struct snd_ad1848 *chip, int on) {

	int tmp;

	if (!chip->thinkpad_flag) return;

	outb(0x1c, AD1848_THINKPAD_CTL_PORT1);
	tmp = inb(AD1848_THINKPAD_CTL_PORT2);

	if (on)
		/* turn it on */
		tmp |= AD1848_THINKPAD_CS4248_ENABLE_BIT;
	else
		/* turn it off */
		tmp &= ~AD1848_THINKPAD_CS4248_ENABLE_BIT;
	
	outb(tmp, AD1848_THINKPAD_CTL_PORT2);

}

#ifdef CONFIG_PM
static void snd_ad1848_suspend(struct snd_ad1848 *chip)
{
	snd_pcm_suspend_all(chip->pcm);
	if (chip->thinkpad_flag)
		snd_ad1848_thinkpad_twiddle(chip, 0);
}

static void snd_ad1848_resume(struct snd_ad1848 *chip)
{
	int i;

	if (chip->thinkpad_flag)
		snd_ad1848_thinkpad_twiddle(chip, 1);

	/* clear any pendings IRQ */
	inb(AD1848P(chip, STATUS));
	outb(0, AD1848P(chip, STATUS));
	mb();

	snd_ad1848_mce_down(chip);
	for (i = 0; i < 16; i++)
		snd_ad1848_out(chip, i, chip->image[i]);
	snd_ad1848_mce_up(chip);
	snd_ad1848_mce_down(chip);
}
#endif /* CONFIG_PM */

static int snd_ad1848_probe(struct snd_ad1848 * chip)
{
	unsigned long flags;
	int i, id, rev, ad1847;
	unsigned char *ptr;

#if 0
	snd_ad1848_debug(chip);
#endif
	id = ad1847 = 0;
	for (i = 0; i < 1000; i++) {
		mb();
		if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
			udelay(500);
		else {
			spin_lock_irqsave(&chip->reg_lock, flags);
			snd_ad1848_out(chip, AD1848_MISC_INFO, 0x00);
			snd_ad1848_out(chip, AD1848_LEFT_INPUT, 0xaa);
			snd_ad1848_out(chip, AD1848_RIGHT_INPUT, 0x45);
			rev = snd_ad1848_in(chip, AD1848_RIGHT_INPUT);
			if (rev == 0x65) {
				spin_unlock_irqrestore(&chip->reg_lock, flags);
				id = 1;
				ad1847 = 1;
				break;
			}
			if (snd_ad1848_in(chip, AD1848_LEFT_INPUT) == 0xaa && rev == 0x45) {
				spin_unlock_irqrestore(&chip->reg_lock, flags);
				id = 1;
				break;
			}
			spin_unlock_irqrestore(&chip->reg_lock, flags);
		}
	}
	if (id != 1)
		return -ENODEV;	/* no valid device found */
	if (chip->hardware == AD1848_HW_DETECT) {
		if (ad1847) {
			chip->hardware = AD1848_HW_AD1847;
		} else {
			chip->hardware = AD1848_HW_AD1848;
			rev = snd_ad1848_in(chip, AD1848_MISC_INFO);
			if (rev & 0x80) {
				chip->hardware = AD1848_HW_CS4248;
			} else if ((rev & 0x0f) == 0x0a) {
				snd_ad1848_out(chip, AD1848_MISC_INFO, 0x40);
				for (i = 0; i < 16; ++i) {
					if (snd_ad1848_in(chip, i) != snd_ad1848_in(chip, i + 16)) {
						chip->hardware = AD1848_HW_CMI8330;
						break;
					}
				}
				snd_ad1848_out(chip, AD1848_MISC_INFO, 0x00);
			}
		}
	}
	spin_lock_irqsave(&chip->reg_lock, flags);
	inb(AD1848P(chip, STATUS));	/* clear any pendings IRQ */
	outb(0, AD1848P(chip, STATUS));
	mb();
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	chip->image[AD1848_MISC_INFO] = 0x00;
	chip->image[AD1848_IFACE_CTRL] =
	    (chip->image[AD1848_IFACE_CTRL] & ~AD1848_SINGLE_DMA) | AD1848_SINGLE_DMA;
	ptr = (unsigned char *) &chip->image;
	snd_ad1848_mce_down(chip);
	spin_lock_irqsave(&chip->reg_lock, flags);
	for (i = 0; i < 16; i++)	/* ok.. fill all AD1848 registers */
		snd_ad1848_out(chip, i, *ptr++);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_ad1848_mce_up(chip);
	snd_ad1848_mce_down(chip);
	return 0;		/* all things are ok.. */
}

/*

 */

static struct snd_pcm_hardware snd_ad1848_playback =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		(SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW |
				 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE),
	.rates =		SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		5510,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		0,
};

static struct snd_pcm_hardware snd_ad1848_capture =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		(SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW |
				 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE),
	.rates =		SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		5510,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		0,
};

/*

 */

static int snd_ad1848_playback_open(struct snd_pcm_substream *substream)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	if ((err = snd_ad1848_open(chip, AD1848_MODE_PLAY)) < 0)
		return err;
	chip->playback_substream = substream;
	runtime->hw = snd_ad1848_playback;
	snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.buffer_bytes_max);
	snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.period_bytes_max);
	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
	return 0;
}

static int snd_ad1848_capture_open(struct snd_pcm_substream *substream)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	if ((err = snd_ad1848_open(chip, AD1848_MODE_CAPTURE)) < 0)
		return err;
	chip->capture_substream = substream;
	runtime->hw = snd_ad1848_capture;
	snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.buffer_bytes_max);
	snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.period_bytes_max);
	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
	return 0;
}

static int snd_ad1848_playback_close(struct snd_pcm_substream *substream)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);

	chip->mode &= ~AD1848_MODE_PLAY;
	chip->playback_substream = NULL;
	snd_ad1848_close(chip);
	return 0;
}

static int snd_ad1848_capture_close(struct snd_pcm_substream *substream)
{
	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);

	chip->mode &= ~AD1848_MODE_CAPTURE;
	chip->capture_substream = NULL;
	snd_ad1848_close(chip);
	return 0;
}

static int snd_ad1848_free(struct snd_ad1848 *chip)
{
	release_and_free_resource(chip->res_port);
	if (chip->irq >= 0)
		free_irq(chip->irq, (void *) chip);
	if (chip->dma >= 0) {
		snd_dma_disable(chip->dma);
		free_dma(chip->dma);
	}
	kfree(chip);
	return 0;
}

static int snd_ad1848_dev_free(struct snd_device *device)
{
	struct snd_ad1848 *chip = device->device_data;
	return snd_ad1848_free(chip);
}

static const char *snd_ad1848_chip_id(struct snd_ad1848 *chip)
{
	switch (chip->hardware) {
	case AD1848_HW_AD1847:	return "AD1847";
	case AD1848_HW_AD1848:	return "AD1848";
	case AD1848_HW_CS4248:	return "CS4248";
	case AD1848_HW_CMI8330: return "CMI8330/C3D";
	default:		return "???";
	}
}

int snd_ad1848_create(struct snd_card *card,
		      unsigned long port,
		      int irq, int dma,
		      unsigned short hardware,
		      struct snd_ad1848 ** rchip)
{
	static struct snd_device_ops ops = {
		.dev_free =	snd_ad1848_dev_free,
	};
	struct snd_ad1848 *chip;
	int err;

	*rchip = NULL;
	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;
	spin_lock_init(&chip->reg_lock);
	mutex_init(&chip->open_mutex);
	chip->card = card;
	chip->port = port;
	chip->irq = -1;
	chip->dma = -1;
	chip->hardware = hardware;
	memcpy(&chip->image, &snd_ad1848_original_image, sizeof(snd_ad1848_original_image));
	
	if ((chip->res_port = request_region(port, 4, "AD1848")) == NULL) {
		snd_printk(KERN_ERR "ad1848: can't grab port 0x%lx\n", port);
		snd_ad1848_free(chip);
		return -EBUSY;
	}
	if (request_irq(irq, snd_ad1848_interrupt, IRQF_DISABLED, "AD1848", (void *) chip)) {
		snd_printk(KERN_ERR "ad1848: can't grab IRQ %d\n", irq);
		snd_ad1848_free(chip);
		return -EBUSY;
	}
	chip->irq = irq;
	if (request_dma(dma, "AD1848")) {
		snd_printk(KERN_ERR "ad1848: can't grab DMA %d\n", dma);
		snd_ad1848_free(chip);
		return -EBUSY;
	}
	chip->dma = dma;

	if (hardware == AD1848_HW_THINKPAD) {
		chip->thinkpad_flag = 1;
		chip->hardware = AD1848_HW_DETECT; /* reset */
		snd_ad1848_thinkpad_twiddle(chip, 1);
	}

	if (snd_ad1848_probe(chip) < 0) {
		snd_ad1848_free(chip);
		return -ENODEV;
	}

	/* Register device */
	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
		snd_ad1848_free(chip);
		return err;
	}

#ifdef CONFIG_PM
	chip->suspend = snd_ad1848_suspend;
	chip->resume = snd_ad1848_resume;
#endif

	*rchip = chip;
	return 0;
}

EXPORT_SYMBOL(snd_ad1848_create);

static struct snd_pcm_ops snd_ad1848_playback_ops = {
	.open =		snd_ad1848_playback_open,
	.close =	snd_ad1848_playback_close,
	.ioctl =	snd_ad1848_ioctl,
	.hw_params =	snd_ad1848_playback_hw_params,
	.hw_free =	snd_ad1848_playback_hw_free,
	.prepare =	snd_ad1848_playback_prepare,
	.trigger =	snd_ad1848_playback_trigger,
	.pointer =	snd_ad1848_playback_pointer,
};

static struct snd_pcm_ops snd_ad1848_capture_ops = {
	.open =		snd_ad1848_capture_open,
	.close =	snd_ad1848_capture_close,
	.ioctl =	snd_ad1848_ioctl,
	.hw_params =	snd_ad1848_capture_hw_params,
	.hw_free =	snd_ad1848_capture_hw_free,
	.prepare =	snd_ad1848_capture_prepare,
	.trigger =	snd_ad1848_capture_trigger,
	.pointer =	snd_ad1848_capture_pointer,
};

int snd_ad1848_pcm(struct snd_ad1848 *chip, int device, struct snd_pcm **rpcm)
{
	struct snd_pcm *pcm;
	int err;

	if ((err = snd_pcm_new(chip->card, "AD1848", device, 1, 1, &pcm)) < 0)
		return err;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_ad1848_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_ad1848_capture_ops);

	pcm->private_data = chip;
	pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
	strcpy(pcm->name, snd_ad1848_chip_id(chip));

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
					      snd_dma_isa_data(),
					      64*1024, chip->dma > 3 ? 128*1024 : 64*1024);

	chip->pcm = pcm;
	if (rpcm)
		*rpcm = pcm;
	return 0;
}

EXPORT_SYMBOL(snd_ad1848_pcm);

const struct snd_pcm_ops *snd_ad1848_get_pcm_ops(int direction)
{
	return direction == SNDRV_PCM_STREAM_PLAYBACK ?
		&snd_ad1848_playback_ops : &snd_ad1848_capture_ops;
}

EXPORT_SYMBOL(snd_ad1848_get_pcm_ops);

/*
 *  MIXER part
 */

static int snd_ad1848_info_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
	static char *texts[4] = {
		"Line", "Aux", "Mic", "Mix"
	};

	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
	uinfo->count = 2;
	uinfo->value.enumerated.items = 4;
	if (uinfo->value.enumerated.item > 3)
		uinfo->value.enumerated.item = 3;
	strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
	return 0;
}

static int snd_ad1848_get_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	
	spin_lock_irqsave(&chip->reg_lock, flags);
	ucontrol->value.enumerated.item[0] = (chip->image[AD1848_LEFT_INPUT] & AD1848_MIXS_ALL) >> 6;
	ucontrol->value.enumerated.item[1] = (chip->image[AD1848_RIGHT_INPUT] & AD1848_MIXS_ALL) >> 6;
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return 0;
}

static int snd_ad1848_put_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	unsigned short left, right;
	int change;
	
	if (ucontrol->value.enumerated.item[0] > 3 ||
	    ucontrol->value.enumerated.item[1] > 3)
		return -EINVAL;
	left = ucontrol->value.enumerated.item[0] << 6;
	right = ucontrol->value.enumerated.item[1] << 6;
	spin_lock_irqsave(&chip->reg_lock, flags);
	left = (chip->image[AD1848_LEFT_INPUT] & ~AD1848_MIXS_ALL) | left;
	right = (chip->image[AD1848_RIGHT_INPUT] & ~AD1848_MIXS_ALL) | right;
	change = left != chip->image[AD1848_LEFT_INPUT] ||
	         right != chip->image[AD1848_RIGHT_INPUT];
	snd_ad1848_out(chip, AD1848_LEFT_INPUT, left);
	snd_ad1848_out(chip, AD1848_RIGHT_INPUT, right);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return change;
}

static int snd_ad1848_info_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
	int mask = (kcontrol->private_value >> 16) & 0xff;

	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = mask;
	return 0;
}

static int snd_ad1848_get_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int reg = kcontrol->private_value & 0xff;
	int shift = (kcontrol->private_value >> 8) & 0xff;
	int mask = (kcontrol->private_value >> 16) & 0xff;
	int invert = (kcontrol->private_value >> 24) & 0xff;
	
	spin_lock_irqsave(&chip->reg_lock, flags);
	ucontrol->value.integer.value[0] = (chip->image[reg] >> shift) & mask;
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	if (invert)
		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
	return 0;
}

static int snd_ad1848_put_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int reg = kcontrol->private_value & 0xff;
	int shift = (kcontrol->private_value >> 8) & 0xff;
	int mask = (kcontrol->private_value >> 16) & 0xff;
	int invert = (kcontrol->private_value >> 24) & 0xff;
	int change;
	unsigned short val;
	
	val = (ucontrol->value.integer.value[0] & mask);
	if (invert)
		val = mask - val;
	val <<= shift;
	spin_lock_irqsave(&chip->reg_lock, flags);
	val = (chip->image[reg] & ~(mask << shift)) | val;
	change = val != chip->image[reg];
	snd_ad1848_out(chip, reg, val);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return change;
}

static int snd_ad1848_info_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
	int mask = (kcontrol->private_value >> 24) & 0xff;

	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = mask;
	return 0;
}

static int snd_ad1848_get_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int left_reg = kcontrol->private_value & 0xff;
	int right_reg = (kcontrol->private_value >> 8) & 0xff;
	int shift_left = (kcontrol->private_value >> 16) & 0x07;
	int shift_right = (kcontrol->private_value >> 19) & 0x07;
	int mask = (kcontrol->private_value >> 24) & 0xff;
	int invert = (kcontrol->private_value >> 22) & 1;
	
	spin_lock_irqsave(&chip->reg_lock, flags);
	ucontrol->value.integer.value[0] = (chip->image[left_reg] >> shift_left) & mask;
	ucontrol->value.integer.value[1] = (chip->image[right_reg] >> shift_right) & mask;
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	if (invert) {
		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
		ucontrol->value.integer.value[1] = mask - ucontrol->value.integer.value[1];
	}
	return 0;
}

static int snd_ad1848_put_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int left_reg = kcontrol->private_value & 0xff;
	int right_reg = (kcontrol->private_value >> 8) & 0xff;
	int shift_left = (kcontrol->private_value >> 16) & 0x07;
	int shift_right = (kcontrol->private_value >> 19) & 0x07;
	int mask = (kcontrol->private_value >> 24) & 0xff;
	int invert = (kcontrol->private_value >> 22) & 1;
	int change;
	unsigned short val1, val2;
	
	val1 = ucontrol->value.integer.value[0] & mask;
	val2 = ucontrol->value.integer.value[1] & mask;
	if (invert) {
		val1 = mask - val1;
		val2 = mask - val2;
	}
	val1 <<= shift_left;
	val2 <<= shift_right;
	spin_lock_irqsave(&chip->reg_lock, flags);
	if (left_reg != right_reg) {
		val1 = (chip->image[left_reg] & ~(mask << shift_left)) | val1;
		val2 = (chip->image[right_reg] & ~(mask << shift_right)) | val2;
		change = val1 != chip->image[left_reg] || val2 != chip->image[right_reg];
		snd_ad1848_out(chip, left_reg, val1);
		snd_ad1848_out(chip, right_reg, val2);
	} else {
		val1 = (chip->image[left_reg] & ~((mask << shift_left) | (mask << shift_right))) | val1 | val2;
		change = val1 != chip->image[left_reg];
		snd_ad1848_out(chip, left_reg, val1);		
	}
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return change;
}

/*
 */
int snd_ad1848_add_ctl_elem(struct snd_ad1848 *chip,
			    const struct ad1848_mix_elem *c)
{
	static struct snd_kcontrol_new newctls[] = {
		[AD1848_MIX_SINGLE] = {
			.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
			.info = snd_ad1848_info_single,
			.get = snd_ad1848_get_single,
			.put = snd_ad1848_put_single,
		},
		[AD1848_MIX_DOUBLE] = {
			.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
			.info = snd_ad1848_info_double,
			.get = snd_ad1848_get_double,
			.put = snd_ad1848_put_double,
		},
		[AD1848_MIX_CAPTURE] = {
			.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
			.info = snd_ad1848_info_mux,
			.get = snd_ad1848_get_mux,
			.put = snd_ad1848_put_mux,
		},
	};
	struct snd_kcontrol *ctl;
	int err;

	ctl = snd_ctl_new1(&newctls[c->type], chip);
	if (! ctl)
		return -ENOMEM;
	strlcpy(ctl->id.name, c->name, sizeof(ctl->id.name));
	ctl->id.index = c->index;
	ctl->private_value = c->private_value;
	if (c->tlv) {
		ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
		ctl->tlv.p = c->tlv;
	}
	if ((err = snd_ctl_add(chip->card, ctl)) < 0)
		return err;
	return 0;
}

EXPORT_SYMBOL(snd_ad1848_add_ctl_elem);

static const DECLARE_TLV_DB_SCALE(db_scale_6bit, -9450, 150, 0);
static const DECLARE_TLV_DB_SCALE(db_scale_5bit_12db_max, -3450, 150, 0);
static const DECLARE_TLV_DB_SCALE(db_scale_rec_gain, 0, 150, 0);

static struct ad1848_mix_elem snd_ad1848_controls[] = {
AD1848_DOUBLE("PCM Playback Switch", 0, AD1848_LEFT_OUTPUT, AD1848_RIGHT_OUTPUT, 7, 7, 1, 1),
AD1848_DOUBLE_TLV("PCM Playback Volume", 0, AD1848_LEFT_OUTPUT, AD1848_RIGHT_OUTPUT, 0, 0, 63, 1,
		  db_scale_6bit),
AD1848_DOUBLE("Aux Playback Switch", 0, AD1848_AUX1_LEFT_INPUT, AD1848_AUX1_RIGHT_INPUT, 7, 7, 1, 1),
AD1848_DOUBLE_TLV("Aux Playback Volume", 0, AD1848_AUX1_LEFT_INPUT, AD1848_AUX1_RIGHT_INPUT, 0, 0, 31, 1,
		  db_scale_5bit_12db_max),
AD1848_DOUBLE("Aux Playback Switch", 1, AD1848_AUX2_LEFT_INPUT, AD1848_AUX2_RIGHT_INPUT, 7, 7, 1, 1),
AD1848_DOUBLE_TLV("Aux Playback Volume", 1, AD1848_AUX2_LEFT_INPUT, AD1848_AUX2_RIGHT_INPUT, 0, 0, 31, 1,
		  db_scale_5bit_12db_max),
AD1848_DOUBLE_TLV("Capture Volume", 0, AD1848_LEFT_INPUT, AD1848_RIGHT_INPUT, 0, 0, 15, 0,
		  db_scale_rec_gain),
{
	.name = "Capture Source",
	.type = AD1848_MIX_CAPTURE,
},
AD1848_SINGLE("Loopback Capture Switch", 0, AD1848_LOOPBACK, 0, 1, 0),
AD1848_SINGLE_TLV("Loopback Capture Volume", 0, AD1848_LOOPBACK, 1, 63, 0,
		  db_scale_6bit),
};
                                        
int snd_ad1848_mixer(struct snd_ad1848 *chip)
{
	struct snd_card *card;
	struct snd_pcm *pcm;
	unsigned int idx;
	int err;

	snd_assert(chip != NULL && chip->pcm != NULL, return -EINVAL);

	pcm = chip->pcm;
	card = chip->card;

	strcpy(card->mixername, pcm->name);

	for (idx = 0; idx < ARRAY_SIZE(snd_ad1848_controls); idx++)
		if ((err = snd_ad1848_add_ctl_elem(chip, &snd_ad1848_controls[idx])) < 0)
			return err;

	return 0;
}

EXPORT_SYMBOL(snd_ad1848_mixer);

/*
 *  INIT part
 */

static int __init alsa_ad1848_init(void)
{
	return 0;
}

static void __exit alsa_ad1848_exit(void)
{
}

module_init(alsa_ad1848_init)
module_exit(alsa_ad1848_exit)