aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/em28xx/em28xx-core.c
blob: 98e140b5d95e66a48876514721ab203369cf2e89 (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
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
/*
   em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices

   Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
		      Markus Rechberger <mrechberger@gmail.com>
		      Mauro Carvalho Chehab <mchehab@infradead.org>
		      Sascha Sommer <saschasommer@freenet.de>

   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>
#include <media/v4l2-common.h>

#include "em28xx.h"

/* #define ENABLE_DEBUG_ISOC_FRAMES */

static unsigned int core_debug;
module_param(core_debug, int, 0644);
MODULE_PARM_DESC(core_debug, "enable debug messages [core]");

#define em28xx_coredbg(fmt, arg...) do {\
	if (core_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __func__ , ##arg); } while (0)

static unsigned int reg_debug;
module_param(reg_debug, int, 0644);
MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");

#define em28xx_regdbg(fmt, arg...) do {\
	if (reg_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __func__ , ##arg); } while (0)

static int alt = EM28XX_PINOUT;
module_param(alt, int, 0644);
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");

/* FIXME */
#define em28xx_isocdbg(fmt, arg...) do {\
	if (core_debug) \
		printk(KERN_INFO "%s %s :"fmt, \
			 dev->name, __func__ , ##arg); } while (0)

/*
 * em28xx_read_reg_req()
 * reads data from the usb device specifying bRequest
 */
int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
				   char *buf, int len)
{
	int ret;
	int pipe = usb_rcvctrlpipe(dev->udev, 0);

	if (dev->state & DEV_DISCONNECTED)
		return -ENODEV;

	if (len > URB_MAX_CTRL_SIZE)
		return -EINVAL;

	if (reg_debug) {
		printk(KERN_DEBUG "(pipe 0x%08x): "
			"IN:  %02x %02x %02x %02x %02x %02x %02x %02x ",
			pipe,
			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			req, 0, 0,
			reg & 0xff, reg >> 8,
			len & 0xff, len >> 8);
	}

	mutex_lock(&dev->ctrl_urb_lock);
	ret = usb_control_msg(dev->udev, pipe, req,
			      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      0x0000, reg, dev->urb_buf, len, HZ);
	if (ret < 0) {
		if (reg_debug)
			printk(" failed!\n");
		mutex_unlock(&dev->ctrl_urb_lock);
		return ret;
	}

	if (len)
		memcpy(buf, dev->urb_buf, len);

	mutex_unlock(&dev->ctrl_urb_lock);

	if (reg_debug) {
		int byte;

		printk("<<<");
		for (byte = 0; byte < len; byte++)
			printk(" %02x", (unsigned char)buf[byte]);
		printk("\n");
	}

	return ret;
}

/*
 * em28xx_read_reg_req()
 * reads data from the usb device specifying bRequest
 */
int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
{
	int ret;
	u8 val;

	ret = em28xx_read_reg_req_len(dev, req, reg, &val, 1);
	if (ret < 0)
		return ret;

	return val;
}

int em28xx_read_reg(struct em28xx *dev, u16 reg)
{
	return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
}

/*
 * em28xx_write_regs_req()
 * sends data to the usb device, specifying bRequest
 */
int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
				 int len)
{
	int ret;
	int pipe = usb_sndctrlpipe(dev->udev, 0);

	if (dev->state & DEV_DISCONNECTED)
		return -ENODEV;

	if ((len < 1) || (len > URB_MAX_CTRL_SIZE))
		return -EINVAL;

	if (reg_debug) {
		int byte;

		printk(KERN_DEBUG "(pipe 0x%08x): "
			"OUT: %02x %02x %02x %02x %02x %02x %02x %02x >>>",
			pipe,
			USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			req, 0, 0,
			reg & 0xff, reg >> 8,
			len & 0xff, len >> 8);

		for (byte = 0; byte < len; byte++)
			printk(" %02x", (unsigned char)buf[byte]);
		printk("\n");
	}

	mutex_lock(&dev->ctrl_urb_lock);
	memcpy(dev->urb_buf, buf, len);
	ret = usb_control_msg(dev->udev, pipe, req,
			      USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			      0x0000, reg, dev->urb_buf, len, HZ);
	mutex_unlock(&dev->ctrl_urb_lock);

	if (dev->wait_after_write)
		msleep(dev->wait_after_write);

	return ret;
}

int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
{
	int rc;

	rc = em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);

	/* Stores GPO/GPIO values at the cache, if changed
	   Only write values should be stored, since input on a GPIO
	   register will return the input bits.
	   Not sure what happens on reading GPO register.
	 */
	if (rc >= 0) {
		if (reg == dev->reg_gpo_num)
			dev->reg_gpo = buf[0];
		else if (reg == dev->reg_gpio_num)
			dev->reg_gpio = buf[0];
	}

	return rc;
}

/* Write a single register */
int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
{
	return em28xx_write_regs(dev, reg, &val, 1);
}

/*
 * em28xx_write_reg_bits()
 * sets only some bits (specified by bitmask) of a register, by first reading
 * the actual value
 */
static int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
				 u8 bitmask)
{
	int oldval;
	u8 newval;

	/* Uses cache for gpo/gpio registers */
	if (reg == dev->reg_gpo_num)
		oldval = dev->reg_gpo;
	else if (reg == dev->reg_gpio_num)
		oldval = dev->reg_gpio;
	else
		oldval = em28xx_read_reg(dev, reg);

	if (oldval < 0)
		return oldval;

	newval = (((u8) oldval) & ~bitmask) | (val & bitmask);

	return em28xx_write_regs(dev, reg, &newval, 1);
}

/*
 * em28xx_is_ac97_ready()
 * Checks if ac97 is ready
 */
static int em28xx_is_ac97_ready(struct em28xx *dev)
{
	int ret, i;

	/* Wait up to 50 ms for AC97 command to complete */
	for (i = 0; i < 10; i++, msleep(5)) {
		ret = em28xx_read_reg(dev, EM28XX_R43_AC97BUSY);
		if (ret < 0)
			return ret;

		if (!(ret & 0x01))
			return 0;
	}

	em28xx_warn("AC97 command still being executed: not handled properly!\n");
	return -EBUSY;
}

/*
 * em28xx_read_ac97()
 * write a 16 bit value to the specified AC97 address (LSB first!)
 */
int em28xx_read_ac97(struct em28xx *dev, u8 reg)
{
	int ret;
	u8 addr = (reg & 0x7f) | 0x80;
	u16 val;

	ret = em28xx_is_ac97_ready(dev);
	if (ret < 0)
		return ret;

	ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
	if (ret < 0)
		return ret;

	ret = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R40_AC97LSB,
					   (u8 *)&val, sizeof(val));

	if (ret < 0)
		return ret;
	return le16_to_cpu(val);
}

/*
 * em28xx_write_ac97()
 * write a 16 bit value to the specified AC97 address (LSB first!)
 */
int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val)
{
	int ret;
	u8 addr = reg & 0x7f;
	__le16 value;

	value = cpu_to_le16(val);

	ret = em28xx_is_ac97_ready(dev);
	if (ret < 0)
		return ret;

	ret = em28xx_write_regs(dev, EM28XX_R40_AC97LSB, (u8 *) &value, 2);
	if (ret < 0)
		return ret;

	ret = em28xx_write_regs(dev, EM28XX_R42_AC97ADDR, &addr, 1);
	if (ret < 0)
		return ret;

	return 0;
}

struct em28xx_vol_table {
	enum em28xx_amux mux;
	u8		 reg;
};

static struct em28xx_vol_table inputs[] = {
	{ EM28XX_AMUX_VIDEO, 	AC97_VIDEO_VOL   },
	{ EM28XX_AMUX_LINE_IN,	AC97_LINEIN_VOL  },
	{ EM28XX_AMUX_PHONE,	AC97_PHONE_VOL   },
	{ EM28XX_AMUX_MIC,	AC97_MIC_VOL     },
	{ EM28XX_AMUX_CD,	AC97_CD_VOL      },
	{ EM28XX_AMUX_AUX,	AC97_AUX_VOL     },
	{ EM28XX_AMUX_PCM_OUT,	AC97_PCM_OUT_VOL },
};

static int set_ac97_input(struct em28xx *dev)
{
	int ret, i;
	enum em28xx_amux amux = dev->ctl_ainput;

	/* EM28XX_AMUX_VIDEO2 is a special case used to indicate that
	   em28xx should point to LINE IN, while AC97 should use VIDEO
	 */
	if (amux == EM28XX_AMUX_VIDEO2)
		amux = EM28XX_AMUX_VIDEO;

	/* Mute all entres but the one that were selected */
	for (i = 0; i < ARRAY_SIZE(inputs); i++) {
		if (amux == inputs[i].mux)
			ret = em28xx_write_ac97(dev, inputs[i].reg, 0x0808);
		else
			ret = em28xx_write_ac97(dev, inputs[i].reg, 0x8000);

		if (ret < 0)
			em28xx_warn("couldn't setup AC97 register %d\n",
				     inputs[i].reg);
	}
	return 0;
}

static int em28xx_set_audio_source(struct em28xx *dev)
{
	int ret;
	u8 input;

	if (dev->board.is_em2800) {
		if (dev->ctl_ainput == EM28XX_AMUX_VIDEO)
			input = EM2800_AUDIO_SRC_TUNER;
		else
			input = EM2800_AUDIO_SRC_LINE;

		ret = em28xx_write_regs(dev, EM2800_R08_AUDIOSRC, &input, 1);
		if (ret < 0)
			return ret;
	}

	if (dev->board.has_msp34xx)
		input = EM28XX_AUDIO_SRC_TUNER;
	else {
		switch (dev->ctl_ainput) {
		case EM28XX_AMUX_VIDEO:
			input = EM28XX_AUDIO_SRC_TUNER;
			break;
		default:
			input = EM28XX_AUDIO_SRC_LINE;
			break;
		}
	}

	if (dev->board.mute_gpio && dev->mute)
		em28xx_gpio_set(dev, dev->board.mute_gpio);
	else
		em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);

	ret = em28xx_write_reg_bits(dev, EM28XX_R0E_AUDIOSRC, input, 0xc0);
	if (ret < 0)
		return ret;
	msleep(5);

	switch (dev->audio_mode.ac97) {
	case EM28XX_NO_AC97:
		break;
	default:
		ret = set_ac97_input(dev);
	}

	return ret;
}

static const struct em28xx_vol_table outputs[] = {
	{ EM28XX_AOUT_MASTER, AC97_MASTER_VOL      },
	{ EM28XX_AOUT_LINE,   AC97_LINE_LEVEL_VOL  },
	{ EM28XX_AOUT_MONO,   AC97_MASTER_MONO_VOL },
	{ EM28XX_AOUT_LFE,    AC97_LFE_MASTER_VOL  },
	{ EM28XX_AOUT_SURR,   AC97_SURR_MASTER_VOL },
};

int em28xx_audio_analog_set(struct em28xx *dev)
{
	int ret, i;
	u8 xclk;

	if (!dev->audio_mode.has_audio)
		return 0;

	/* It is assumed that all devices use master volume for output.
	   It would be possible to use also line output.
	 */
	if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
		/* Mute all outputs */
		for (i = 0; i < ARRAY_SIZE(outputs); i++) {
			ret = em28xx_write_ac97(dev, outputs[i].reg, 0x8000);
			if (ret < 0)
				em28xx_warn("couldn't setup AC97 register %d\n",
				     outputs[i].reg);
		}
	}

	xclk = dev->board.xclk & 0x7f;
	if (!dev->mute)
		xclk |= EM28XX_XCLK_AUDIO_UNMUTE;

	ret = em28xx_write_reg(dev, EM28XX_R0F_XCLK, xclk);
	if (ret < 0)
		return ret;
	msleep(10);

	/* Selects the proper audio input */
	ret = em28xx_set_audio_source(dev);

	/* Sets volume */
	if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
		int vol;

		em28xx_write_ac97(dev, AC97_POWER_DOWN_CTRL, 0x4200);
		em28xx_write_ac97(dev, AC97_EXT_AUD_CTRL, 0x0031);
		em28xx_write_ac97(dev, AC97_PCM_IN_SRATE, 0xbb80);

		/* LSB: left channel - both channels with the same level */
		vol = (0x1f - dev->volume) | ((0x1f - dev->volume) << 8);

		/* Mute device, if needed */
		if (dev->mute)
			vol |= 0x8000;

		/* Sets volume */
		for (i = 0; i < ARRAY_SIZE(outputs); i++) {
			if (dev->ctl_aoutput & outputs[i].mux)
				ret = em28xx_write_ac97(dev, outputs[i].reg,
							vol);
			if (ret < 0)
				em28xx_warn("couldn't setup AC97 register %d\n",
				     outputs[i].reg);
		}

		if (dev->ctl_aoutput & EM28XX_AOUT_PCM_IN) {
			int sel = ac97_return_record_select(dev->ctl_aoutput);

			/* Use the same input for both left and right
			   channels */
			sel |= (sel << 8);

			em28xx_write_ac97(dev, AC97_RECORD_SELECT, sel);
		}
	}

	return ret;
}
EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);

int em28xx_audio_setup(struct em28xx *dev)
{
	int vid1, vid2, feat, cfg;
	u32 vid;

	if (dev->chip_id == CHIP_ID_EM2870 || dev->chip_id == CHIP_ID_EM2874) {
		/* Digital only device - don't load any alsa module */
		dev->audio_mode.has_audio = 0;
		dev->has_audio_class = 0;
		dev->has_alsa_audio = 0;
		return 0;
	}

	/* If device doesn't support Usb Audio Class, use vendor class */
	if (!dev->has_audio_class)
		dev->has_alsa_audio = 1;

	dev->audio_mode.has_audio = 1;

	/* See how this device is configured */
	cfg = em28xx_read_reg(dev, EM28XX_R00_CHIPCFG);
	em28xx_info("Config register raw data: 0x%02x\n", cfg);
	if (cfg < 0) {
		/* Register read error?  */
		cfg = EM28XX_CHIPCFG_AC97; /* Be conservative */
	} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) == 0x00) {
		/* The device doesn't have vendor audio at all */
		dev->has_alsa_audio = 0;
		dev->audio_mode.has_audio = 0;
		return 0;
	} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
		   EM28XX_CHIPCFG_I2S_3_SAMPRATES) {
		em28xx_info("I2S Audio (3 sample rates)\n");
		dev->audio_mode.i2s_3rates = 1;
	} else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
		   EM28XX_CHIPCFG_I2S_5_SAMPRATES) {
		em28xx_info("I2S Audio (5 sample rates)\n");
		dev->audio_mode.i2s_5rates = 1;
	}

	if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
		/* Skip the code that does AC97 vendor detection */
		dev->audio_mode.ac97 = EM28XX_NO_AC97;
		goto init_audio;
	}

	dev->audio_mode.ac97 = EM28XX_AC97_OTHER;

	vid1 = em28xx_read_ac97(dev, AC97_VENDOR_ID1);
	if (vid1 < 0) {
		/* Device likely doesn't support AC97 */
		em28xx_warn("AC97 chip type couldn't be determined\n");
		goto init_audio;
	}

	vid2 = em28xx_read_ac97(dev, AC97_VENDOR_ID2);
	if (vid2 < 0)
		goto init_audio;

	vid = vid1 << 16 | vid2;

	dev->audio_mode.ac97_vendor_id = vid;
	em28xx_warn("AC97 vendor ID = 0x%08x\n", vid);

	feat = em28xx_read_ac97(dev, AC97_RESET);
	if (feat < 0)
		goto init_audio;

	dev->audio_mode.ac97_feat = feat;
	em28xx_warn("AC97 features = 0x%04x\n", feat);

	/* Try to identify what audio processor we have */
	if ((vid == 0xffffffff) && (feat == 0x6a90))
		dev->audio_mode.ac97 = EM28XX_AC97_EM202;
	else if ((vid >> 8) == 0x838476)
		dev->audio_mode.ac97 = EM28XX_AC97_SIGMATEL;

init_audio:
	/* Reports detected AC97 processor */
	switch (dev->audio_mode.ac97) {
	case EM28XX_NO_AC97:
		em28xx_info("No AC97 audio processor\n");
		break;
	case EM28XX_AC97_EM202:
		em28xx_info("Empia 202 AC97 audio processor detected\n");
		break;
	case EM28XX_AC97_SIGMATEL:
		em28xx_info("Sigmatel audio processor detected(stac 97%02x)\n",
			    dev->audio_mode.ac97_vendor_id & 0xff);
		break;
	case EM28XX_AC97_OTHER:
		em28xx_warn("Unknown AC97 audio processor detected!\n");
		break;
	default:
		break;
	}

	return em28xx_audio_analog_set(dev);
}
EXPORT_SYMBOL_GPL(em28xx_audio_setup);

int em28xx_colorlevels_set_default(struct em28xx *dev)
{
	em28xx_write_reg(dev, EM28XX_R20_YGAIN, 0x10);	/* contrast */
	em28xx_write_reg(dev, EM28XX_R21_YOFFSET, 0x00);	/* brightness */
	em28xx_write_reg(dev, EM28XX_R22_UVGAIN, 0x10);	/* saturation */
	em28xx_write_reg(dev, EM28XX_R23_UOFFSET, 0x00);
	em28xx_write_reg(dev, EM28XX_R24_VOFFSET, 0x00);
	em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, 0x00);

	em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
	em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
	em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
	em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
	em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
	em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
	return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
}

int em28xx_capture_start(struct em28xx *dev, int start)
{
	int rc;

	if (dev->chip_id == CHIP_ID_EM2874) {
		/* The Transport Stream Enable Register moved in em2874 */
		if (!start) {
			rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
						   0x00,
						   EM2874_TS1_CAPTURE_ENABLE);
			return rc;
		}

		/* Enable Transport Stream */
		rc = em28xx_write_reg_bits(dev, EM2874_R5F_TS_ENABLE,
					   EM2874_TS1_CAPTURE_ENABLE,
					   EM2874_TS1_CAPTURE_ENABLE);
		return rc;
	}


	/* FIXME: which is the best order? */
	/* video registers are sampled by VREF */
	rc = em28xx_write_reg_bits(dev, EM28XX_R0C_USBSUSP,
				   start ? 0x10 : 0x00, 0x10);
	if (rc < 0)
		return rc;

	if (!start) {
		/* disable video capture */
		rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x27);
		return rc;
	}

	if (dev->board.is_webcam)
		rc = em28xx_write_reg(dev, 0x13, 0x0c);

	/* enable video capture */
	rc = em28xx_write_reg(dev, 0x48, 0x00);

	if (dev->mode == EM28XX_ANALOG_MODE)
		rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
	else
		rc = em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);

	msleep(6);

	return rc;
}

int em28xx_set_outfmt(struct em28xx *dev)
{
	int ret;

	ret = em28xx_write_reg_bits(dev, EM28XX_R27_OUTFMT,
				dev->format->reg | 0x20, 0xff);
	if (ret < 0)
			return ret;

	ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, dev->vinmode);
	if (ret < 0)
		return ret;

	return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, dev->vinctl);
}

static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
				  u8 ymin, u8 ymax)
{
	em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
			xmin, ymin, xmax, ymax);

	em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
	em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
	em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
	return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
}

static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
				   u16 width, u16 height)
{
	u8 cwidth = width;
	u8 cheight = height;
	u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);

	em28xx_coredbg("em28xx Area Set: (%d,%d)\n",
			(width | (overflow & 2) << 7),
			(height | (overflow & 1) << 8));

	em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
	em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
	em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
	em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
	return em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
}

static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
{
	u8 mode;
	/* the em2800 scaler only supports scaling down to 50% */

	if (dev->board.is_em2800) {
		mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
	} else {
		u8 buf[2];

		buf[0] = h;
		buf[1] = h >> 8;
		em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);

		buf[0] = v;
		buf[1] = v >> 8;
		em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
		/* it seems that both H and V scalers must be active
		   to work correctly */
		mode = (h || v) ? 0x30 : 0x00;
	}
	return em28xx_write_reg_bits(dev, EM28XX_R26_COMPR, mode, 0x30);
}

/* FIXME: this only function read values from dev */
int em28xx_resolution_set(struct em28xx *dev)
{
	int width, height;
	width = norm_maxw(dev);
	height = norm_maxh(dev);

	if (!dev->progressive)
		height >>= norm_maxh(dev);

	em28xx_set_outfmt(dev);


	em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
	em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);

	return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
}

int em28xx_set_alternate(struct em28xx *dev)
{
	int errCode, prev_alt = dev->alt;
	int i;
	unsigned int min_pkt_size = dev->width * 2 + 4;

	/* When image size is bigger than a certain value,
	   the frame size should be increased, otherwise, only
	   green screen will be received.
	 */
	if (dev->width * 2 * dev->height > 720 * 240 * 2)
		min_pkt_size *= 2;

	for (i = 0; i < dev->num_alt; i++) {
		/* stop when the selected alt setting offers enough bandwidth */
		if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
			dev->alt = i;
			break;
		/* otherwise make sure that we end up with the maximum bandwidth
		   because the min_pkt_size equation might be wrong...
		*/
		} else if (dev->alt_max_pkt_size[i] >
			   dev->alt_max_pkt_size[dev->alt])
			dev->alt = i;
	}

	if (dev->alt != prev_alt) {
		em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
				min_pkt_size, dev->alt);
		dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
		em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n",
			       dev->alt, dev->max_pkt_size);
		errCode = usb_set_interface(dev->udev, 0, dev->alt);
		if (errCode < 0) {
			em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
					dev->alt, errCode);
			return errCode;
		}
	}
	return 0;
}

int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
{
	int rc = 0;

	if (!gpio)
		return rc;

	if (dev->mode != EM28XX_SUSPEND) {
		em28xx_write_reg(dev, 0x48, 0x00);
		if (dev->mode == EM28XX_ANALOG_MODE)
			em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
		else
			em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
		msleep(6);
	}

	/* Send GPIO reset sequences specified at board entry */
	while (gpio->sleep >= 0) {
		if (gpio->reg >= 0) {
			rc = em28xx_write_reg_bits(dev,
						   gpio->reg,
						   gpio->val,
						   gpio->mask);
			if (rc < 0)
				return rc;
		}
		if (gpio->sleep > 0)
			msleep(gpio->sleep);

		gpio++;
	}
	return rc;
}

int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
{
	if (dev->mode == set_mode)
		return 0;

	if (set_mode == EM28XX_SUSPEND) {
		dev->mode = set_mode;

		/* FIXME: add suspend support for ac97 */

		return em28xx_gpio_set(dev, dev->board.suspend_gpio);
	}

	dev->mode = set_mode;

	if (dev->mode == EM28XX_DIGITAL_MODE)
		return em28xx_gpio_set(dev, dev->board.dvb_gpio);
	else
		return em28xx_gpio_set(dev, INPUT(dev->ctl_input)->gpio);
}
EXPORT_SYMBOL_GPL(em28xx_set_mode);

/* ------------------------------------------------------------------
	URB control
   ------------------------------------------------------------------*/

/*
 * IRQ callback, called by URB callback
 */
static void em28xx_irq_callback(struct urb *urb)
{
	struct em28xx_dmaqueue  *dma_q = urb->context;
	struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
	int rc, i;

	switch (urb->status) {
	case 0:             /* success */
	case -ETIMEDOUT:    /* NAK */
		break;
	case -ECONNRESET:   /* kill */
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	default:            /* error */
		em28xx_isocdbg("urb completition error %d.\n", urb->status);
		break;
	}

	/* Copy data from URB */
	spin_lock(&dev->slock);
	rc = dev->isoc_ctl.isoc_copy(dev, urb);
	spin_unlock(&dev->slock);

	/* Reset urb buffers */
	for (i = 0; i < urb->number_of_packets; i++) {
		urb->iso_frame_desc[i].status = 0;
		urb->iso_frame_desc[i].actual_length = 0;
	}
	urb->status = 0;

	urb->status = usb_submit_urb(urb, GFP_ATOMIC);
	if (urb->status) {
		em28xx_isocdbg("urb resubmit failed (error=%i)\n",
			       urb->status);
	}
}

/*
 * Stop and Deallocate URBs
 */
void em28xx_uninit_isoc(struct em28xx *dev)
{
	struct urb *urb;
	int i;

	em28xx_isocdbg("em28xx: called em28xx_uninit_isoc\n");

	dev->isoc_ctl.nfields = -1;
	for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
		urb = dev->isoc_ctl.urb[i];
		if (urb) {
			if (!irqs_disabled())
				usb_kill_urb(urb);
			else
				usb_unlink_urb(urb);

			if (dev->isoc_ctl.transfer_buffer[i]) {
				usb_buffer_free(dev->udev,
					urb->transfer_buffer_length,
					dev->isoc_ctl.transfer_buffer[i],
					urb->transfer_dma);
			}
			usb_free_urb(urb);
			dev->isoc_ctl.urb[i] = NULL;
		}
		dev->isoc_ctl.transfer_buffer[i] = NULL;
	}

	kfree(dev->isoc_ctl.urb);
	kfree(dev->isoc_ctl.transfer_buffer);

	dev->isoc_ctl.urb = NULL;
	dev->isoc_ctl.transfer_buffer = NULL;
	dev->isoc_ctl.num_bufs = 0;

	em28xx_capture_start(dev, 0);
}
EXPORT_SYMBOL_GPL(em28xx_uninit_isoc);

/*
 * Allocate URBs and start IRQ
 */
int em28xx_init_isoc(struct em28xx *dev, int max_packets,
		     int num_bufs, int max_pkt_size,
		     int (*isoc_copy) (struct em28xx *dev, struct urb *urb))
{
	struct em28xx_dmaqueue *dma_q = &dev->vidq;
	int i;
	int sb_size, pipe;
	struct urb *urb;
	int j, k;
	int rc;

	em28xx_isocdbg("em28xx: called em28xx_prepare_isoc\n");

	/* De-allocates all pending stuff */
	em28xx_uninit_isoc(dev);

	dev->isoc_ctl.isoc_copy = isoc_copy;
	dev->isoc_ctl.num_bufs = num_bufs;

	dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs,  GFP_KERNEL);
	if (!dev->isoc_ctl.urb) {
		em28xx_errdev("cannot alloc memory for usb buffers\n");
		return -ENOMEM;
	}

	dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
					      GFP_KERNEL);
	if (!dev->isoc_ctl.transfer_buffer) {
		em28xx_errdev("cannot allocate memory for usb transfer\n");
		kfree(dev->isoc_ctl.urb);
		return -ENOMEM;
	}

	dev->isoc_ctl.max_pkt_size = max_pkt_size;
	dev->isoc_ctl.buf = NULL;

	sb_size = max_packets * dev->isoc_ctl.max_pkt_size;

	/* allocate urbs and transfer buffers */
	for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
		urb = usb_alloc_urb(max_packets, GFP_KERNEL);
		if (!urb) {
			em28xx_err("cannot alloc isoc_ctl.urb %i\n", i);
			em28xx_uninit_isoc(dev);
			return -ENOMEM;
		}
		dev->isoc_ctl.urb[i] = urb;

		dev->isoc_ctl.transfer_buffer[i] = usb_buffer_alloc(dev->udev,
			sb_size, GFP_KERNEL, &urb->transfer_dma);
		if (!dev->isoc_ctl.transfer_buffer[i]) {
			em28xx_err("unable to allocate %i bytes for transfer"
					" buffer %i%s\n",
					sb_size, i,
					in_interrupt() ? " while in int" : "");
			em28xx_uninit_isoc(dev);
			return -ENOMEM;
		}
		memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);

		/* FIXME: this is a hack - should be
			'desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK'
			should also be using 'desc.bInterval'
		 */
		pipe = usb_rcvisocpipe(dev->udev,
			dev->mode == EM28XX_ANALOG_MODE ? 0x82 : 0x84);

		usb_fill_int_urb(urb, dev->udev, pipe,
				 dev->isoc_ctl.transfer_buffer[i], sb_size,
				 em28xx_irq_callback, dma_q, 1);

		urb->number_of_packets = max_packets;
		urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;

		k = 0;
		for (j = 0; j < max_packets; j++) {
			urb->iso_frame_desc[j].offset = k;
			urb->iso_frame_desc[j].length =
						dev->isoc_ctl.max_pkt_size;
			k += dev->isoc_ctl.max_pkt_size;
		}
	}

	init_waitqueue_head(&dma_q->wq);

	em28xx_capture_start(dev, 1);

	/* submit urbs and enables IRQ */
	for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
		rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_ATOMIC);
		if (rc) {
			em28xx_err("submit of urb %i failed (error=%i)\n", i,
				   rc);
			em28xx_uninit_isoc(dev);
			return rc;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(em28xx_init_isoc);

/* Determine the packet size for the DVB stream for the given device
   (underlying value programmed into the eeprom) */
int em28xx_isoc_dvb_max_packetsize(struct em28xx *dev)
{
	unsigned int chip_cfg2;
	unsigned int packet_size = 564;

	if (dev->chip_id == CHIP_ID_EM2874) {
		/* FIXME - for now assume 564 like it was before, but the
		   em2874 code should be added to return the proper value... */
		packet_size = 564;
	} else {
		/* TS max packet size stored in bits 1-0 of R01 */
		chip_cfg2 = em28xx_read_reg(dev, EM28XX_R01_CHIPCFG2);
		switch (chip_cfg2 & EM28XX_CHIPCFG2_TS_PACKETSIZE_MASK) {
		case EM28XX_CHIPCFG2_TS_PACKETSIZE_188:
			packet_size = 188;
			break;
		case EM28XX_CHIPCFG2_TS_PACKETSIZE_376:
			packet_size = 376;
			break;
		case EM28XX_CHIPCFG2_TS_PACKETSIZE_564:
			packet_size = 564;
			break;
		case EM28XX_CHIPCFG2_TS_PACKETSIZE_752:
			packet_size = 752;
			break;
		}
	}

	em28xx_coredbg("dvb max packet size=%d\n", packet_size);
	return packet_size;
}
EXPORT_SYMBOL_GPL(em28xx_isoc_dvb_max_packetsize);

/*
 * em28xx_wake_i2c()
 * configure i2c attached devices
 */
void em28xx_wake_i2c(struct em28xx *dev)
{
	v4l2_device_call_all(&dev->v4l2_dev, 0, core,  reset, 0);
	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
			INPUT(dev->ctl_input)->vmux, 0, 0);
	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
}

/*
 * Device control list
 */

static LIST_HEAD(em28xx_devlist);
static DEFINE_MUTEX(em28xx_devlist_mutex);

struct em28xx *em28xx_get_device(int minor,
				 enum v4l2_buf_type *fh_type,
				 int *has_radio)
{
	struct em28xx *h, *dev = NULL;

	*fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	*has_radio = 0;

	mutex_lock(&em28xx_devlist_mutex);
	list_for_each_entry(h, &em28xx_devlist, devlist) {
		if (h->vdev->minor == minor)
			dev = h;
		if (h->vbi_dev->minor == minor) {
			dev = h;
			*fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
		}
		if (h->radio_dev &&
		    h->radio_dev->minor == minor) {
			dev = h;
			*has_radio = 1;
		}
	}
	mutex_unlock(&em28xx_devlist_mutex);

	return dev;
}

/*
 * em28xx_realease_resources()
 * unregisters the v4l2,i2c and usb devices
 * called when the device gets disconected or at module unload
*/
void em28xx_remove_from_devlist(struct em28xx *dev)
{
	mutex_lock(&em28xx_devlist_mutex);
	list_del(&dev->devlist);
	mutex_unlock(&em28xx_devlist_mutex);
};

void em28xx_add_into_devlist(struct em28xx *dev)
{
	mutex_lock(&em28xx_devlist_mutex);
	list_add_tail(&dev->devlist, &em28xx_devlist);
	mutex_unlock(&em28xx_devlist_mutex);
};

/*
 * Extension interface
 */

static LIST_HEAD(em28xx_extension_devlist);
static DEFINE_MUTEX(em28xx_extension_devlist_lock);

int em28xx_register_extension(struct em28xx_ops *ops)
{
	struct em28xx *dev = NULL;

	mutex_lock(&em28xx_devlist_mutex);
	mutex_lock(&em28xx_extension_devlist_lock);
	list_add_tail(&ops->next, &em28xx_extension_devlist);
	list_for_each_entry(dev, &em28xx_devlist, devlist) {
		if (dev)
			ops->init(dev);
	}
	printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
	mutex_unlock(&em28xx_extension_devlist_lock);
	mutex_unlock(&em28xx_devlist_mutex);
	return 0;
}
EXPORT_SYMBOL(em28xx_register_extension);

void em28xx_unregister_extension(struct em28xx_ops *ops)
{
	struct em28xx *dev = NULL;

	mutex_lock(&em28xx_devlist_mutex);
	list_for_each_entry(dev, &em28xx_devlist, devlist) {
		if (dev)
			ops->fini(dev);
	}

	mutex_lock(&em28xx_extension_devlist_lock);
	printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
	list_del(&ops->next);
	mutex_unlock(&em28xx_extension_devlist_lock);
	mutex_unlock(&em28xx_devlist_mutex);
}
EXPORT_SYMBOL(em28xx_unregister_extension);

void em28xx_init_extension(struct em28xx *dev)
{
	struct em28xx_ops *ops = NULL;

	mutex_lock(&em28xx_extension_devlist_lock);
	if (!list_empty(&em28xx_extension_devlist)) {
		list_for_each_entry(ops, &em28xx_extension_devlist, next) {
			if (ops->init)
				ops->init(dev);
		}
	}
	mutex_unlock(&em28xx_extension_devlist_lock);
}

void em28xx_close_extension(struct em28xx *dev)
{
	struct em28xx_ops *ops = NULL;

	mutex_lock(&em28xx_extension_devlist_lock);
	if (!list_empty(&em28xx_extension_devlist)) {
		list_for_each_entry(ops, &em28xx_extension_devlist, next) {
			if (ops->fini)
				ops->fini(dev);
		}
	}
	mutex_unlock(&em28xx_extension_devlist_lock);
}