summaryrefslogtreecommitdiffstats
path: root/drivers/media/v4l2-core/tuner-core.c
blob: 559f8372e2eb3d9bfc021da1196582d3f438ba21 (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
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
/*
 * i2c tv tuner chip device driver
 * core core, i.e. kernel interfaces, registering and so on
 *
 * Copyright(c) by Ralph Metzler, Gerd Knorr, Gunther Mayer
 *
 * Copyright(c) 2005-2011 by Mauro Carvalho Chehab
 *	- Added support for a separate Radio tuner
 *	- Major rework and cleanups at the code
 *
 * This driver supports many devices and the idea is to let the driver
 * detect which device is present. So rather than listing all supported
 * devices here, we pretend to support a single, fake device type that will
 * handle both radio and analog TV tuning.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/i2c.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/videodev2.h>
#include <media/tuner.h>
#include <media/tuner-types.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include "mt20xx.h"
#include "tda8290.h"
#include "tea5761.h"
#include "tea5767.h"
#include "tuner-xc2028.h"
#include "tuner-simple.h"
#include "tda9887.h"
#include "xc5000.h"
#include "tda18271.h"
#include "xc4000.h"

#define UNSET (-1U)

#define PREFIX (t->i2c->dev.driver->name)

/*
 * Driver modprobe parameters
 */

/* insmod options used at init time => read/only */
static unsigned int addr;
static unsigned int no_autodetect;
static unsigned int show_i2c;

module_param(addr, int, 0444);
module_param(no_autodetect, int, 0444);
module_param(show_i2c, int, 0444);

/* insmod options used at runtime => read/write */
static int tuner_debug;
static unsigned int tv_range[2] = { 44, 958 };
static unsigned int radio_range[2] = { 65, 108 };
static char pal[] = "--";
static char secam[] = "--";
static char ntsc[] = "-";

module_param_named(debug, tuner_debug, int, 0644);
module_param_array(tv_range, int, NULL, 0644);
module_param_array(radio_range, int, NULL, 0644);
module_param_string(pal, pal, sizeof(pal), 0644);
module_param_string(secam, secam, sizeof(secam), 0644);
module_param_string(ntsc, ntsc, sizeof(ntsc), 0644);

/*
 * Static vars
 */

static LIST_HEAD(tuner_list);
static const struct v4l2_subdev_ops tuner_ops;

/*
 * Debug macros
 */

#define tuner_warn(fmt, arg...) do {			\
	printk(KERN_WARNING "%s %d-%04x: " fmt, PREFIX, \
	       i2c_adapter_id(t->i2c->adapter),		\
	       t->i2c->addr, ##arg);			\
	 } while (0)

#define tuner_info(fmt, arg...) do {			\
	printk(KERN_INFO "%s %d-%04x: " fmt, PREFIX,	\
	       i2c_adapter_id(t->i2c->adapter),		\
	       t->i2c->addr, ##arg);			\
	 } while (0)

#define tuner_err(fmt, arg...) do {			\
	printk(KERN_ERR "%s %d-%04x: " fmt, PREFIX,	\
	       i2c_adapter_id(t->i2c->adapter),		\
	       t->i2c->addr, ##arg);			\
	 } while (0)

#define tuner_dbg(fmt, arg...) do {				\
	if (tuner_debug)					\
		printk(KERN_DEBUG "%s %d-%04x: " fmt, PREFIX,	\
		       i2c_adapter_id(t->i2c->adapter),		\
		       t->i2c->addr, ##arg);			\
	 } while (0)

/*
 * Internal struct used inside the driver
 */

struct tuner {
	/* device */
	struct dvb_frontend fe;
	struct i2c_client   *i2c;
	struct v4l2_subdev  sd;
	struct list_head    list;

	/* keep track of the current settings */
	v4l2_std_id         std;
	unsigned int        tv_freq;
	unsigned int        radio_freq;
	unsigned int        audmode;

	enum v4l2_tuner_type mode;
	unsigned int        mode_mask; /* Combination of allowable modes */

	bool                standby;	/* Standby mode */

	unsigned int        type; /* chip type id */
	void                *config;
	const char          *name;
};

/*
 * Function prototypes
 */

static void set_tv_freq(struct i2c_client *c, unsigned int freq);
static void set_radio_freq(struct i2c_client *c, unsigned int freq);

/*
 * tuner attach/detach logic
 */

/* This macro allows us to probe dynamically, avoiding static links */
#ifdef CONFIG_MEDIA_ATTACH
#define tuner_symbol_probe(FUNCTION, ARGS...) ({ \
	int __r = -EINVAL; \
	typeof(&FUNCTION) __a = symbol_request(FUNCTION); \
	if (__a) { \
		__r = (int) __a(ARGS); \
		symbol_put(FUNCTION); \
	} else { \
		printk(KERN_ERR "TUNER: Unable to find " \
				"symbol "#FUNCTION"()\n"); \
	} \
	__r; \
})

static void tuner_detach(struct dvb_frontend *fe)
{
	if (fe->ops.tuner_ops.release) {
		fe->ops.tuner_ops.release(fe);
		symbol_put_addr(fe->ops.tuner_ops.release);
	}
	if (fe->ops.analog_ops.release) {
		fe->ops.analog_ops.release(fe);
		symbol_put_addr(fe->ops.analog_ops.release);
	}
}
#else
#define tuner_symbol_probe(FUNCTION, ARGS...) ({ \
	FUNCTION(ARGS); \
})

static void tuner_detach(struct dvb_frontend *fe)
{
	if (fe->ops.tuner_ops.release)
		fe->ops.tuner_ops.release(fe);
	if (fe->ops.analog_ops.release)
		fe->ops.analog_ops.release(fe);
}
#endif


static inline struct tuner *to_tuner(struct v4l2_subdev *sd)
{
	return container_of(sd, struct tuner, sd);
}

/*
 * struct analog_demod_ops callbacks
 */

static void fe_set_params(struct dvb_frontend *fe,
			  struct analog_parameters *params)
{
	struct dvb_tuner_ops *fe_tuner_ops = &fe->ops.tuner_ops;
	struct tuner *t = fe->analog_demod_priv;

	if (NULL == fe_tuner_ops->set_analog_params) {
		tuner_warn("Tuner frontend module has no way to set freq\n");
		return;
	}
	fe_tuner_ops->set_analog_params(fe, params);
}

static void fe_standby(struct dvb_frontend *fe)
{
	struct dvb_tuner_ops *fe_tuner_ops = &fe->ops.tuner_ops;

	if (fe_tuner_ops->sleep)
		fe_tuner_ops->sleep(fe);
}

static int fe_set_config(struct dvb_frontend *fe, void *priv_cfg)
{
	struct dvb_tuner_ops *fe_tuner_ops = &fe->ops.tuner_ops;
	struct tuner *t = fe->analog_demod_priv;

	if (fe_tuner_ops->set_config)
		return fe_tuner_ops->set_config(fe, priv_cfg);

	tuner_warn("Tuner frontend module has no way to set config\n");

	return 0;
}

static void tuner_status(struct dvb_frontend *fe);

static const struct analog_demod_ops tuner_analog_ops = {
	.set_params     = fe_set_params,
	.standby        = fe_standby,
	.set_config     = fe_set_config,
	.tuner_status   = tuner_status
};

/*
 * Functions to select between radio and TV and tuner probe/remove functions
 */

/**
 * set_type - Sets the tuner type for a given device
 *
 * @c:			i2c_client descriptor
 * @type:		type of the tuner (e. g. tuner number)
 * @new_mode_mask:	Indicates if tuner supports TV and/or Radio
 * @new_config:		an optional parameter used by a few tuners to adjust
			internal parameters, like LNA mode
 * @tuner_callback:	an optional function to be called when switching
 *			to analog mode
 *
 * This function applys the tuner config to tuner specified
 * by tun_setup structure. It contains several per-tuner initialization "magic"
 */
static void set_type(struct i2c_client *c, unsigned int type,
		     unsigned int new_mode_mask, void *new_config,
		     int (*tuner_callback) (void *dev, int component, int cmd, int arg))
{
	struct tuner *t = to_tuner(i2c_get_clientdata(c));
	struct dvb_tuner_ops *fe_tuner_ops = &t->fe.ops.tuner_ops;
	struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;
	unsigned char buffer[4];
	int tune_now = 1;

	if (type == UNSET || type == TUNER_ABSENT) {
		tuner_dbg("tuner 0x%02x: Tuner type absent\n", c->addr);
		return;
	}

	t->type = type;
	t->config = new_config;
	if (tuner_callback != NULL) {
		tuner_dbg("defining GPIO callback\n");
		t->fe.callback = tuner_callback;
	}

	/* discard private data, in case set_type() was previously called */
	tuner_detach(&t->fe);
	t->fe.analog_demod_priv = NULL;

	switch (t->type) {
	case TUNER_MT2032:
		if (!dvb_attach(microtune_attach,
			   &t->fe, t->i2c->adapter, t->i2c->addr))
			goto attach_failed;
		break;
	case TUNER_PHILIPS_TDA8290:
	{
		if (!dvb_attach(tda829x_attach, &t->fe, t->i2c->adapter,
				t->i2c->addr, t->config))
			goto attach_failed;
		break;
	}
	case TUNER_TEA5767:
		if (!dvb_attach(tea5767_attach, &t->fe,
				t->i2c->adapter, t->i2c->addr))
			goto attach_failed;
		t->mode_mask = T_RADIO;
		break;
	case TUNER_TEA5761:
		if (!dvb_attach(tea5761_attach, &t->fe,
				t->i2c->adapter, t->i2c->addr))
			goto attach_failed;
		t->mode_mask = T_RADIO;
		break;
	case TUNER_PHILIPS_FMD1216ME_MK3:
	case TUNER_PHILIPS_FMD1216MEX_MK3:
		buffer[0] = 0x0b;
		buffer[1] = 0xdc;
		buffer[2] = 0x9c;
		buffer[3] = 0x60;
		i2c_master_send(c, buffer, 4);
		mdelay(1);
		buffer[2] = 0x86;
		buffer[3] = 0x54;
		i2c_master_send(c, buffer, 4);
		if (!dvb_attach(simple_tuner_attach, &t->fe,
				t->i2c->adapter, t->i2c->addr, t->type))
			goto attach_failed;
		break;
	case TUNER_PHILIPS_TD1316:
		buffer[0] = 0x0b;
		buffer[1] = 0xdc;
		buffer[2] = 0x86;
		buffer[3] = 0xa4;
		i2c_master_send(c, buffer, 4);
		if (!dvb_attach(simple_tuner_attach, &t->fe,
				t->i2c->adapter, t->i2c->addr, t->type))
			goto attach_failed;
		break;
	case TUNER_XC2028:
	{
		struct xc2028_config cfg = {
			.i2c_adap  = t->i2c->adapter,
			.i2c_addr  = t->i2c->addr,
		};
		if (!dvb_attach(xc2028_attach, &t->fe, &cfg))
			goto attach_failed;
		tune_now = 0;
		break;
	}
	case TUNER_TDA9887:
		if (!dvb_attach(tda9887_attach,
			   &t->fe, t->i2c->adapter, t->i2c->addr))
			goto attach_failed;
		break;
	case TUNER_XC5000:
	{
		struct xc5000_config xc5000_cfg = {
			.i2c_address = t->i2c->addr,
			/* if_khz will be set at dvb_attach() */
			.if_khz	  = 0,
		};

		if (!dvb_attach(xc5000_attach,
				&t->fe, t->i2c->adapter, &xc5000_cfg))
			goto attach_failed;
		tune_now = 0;
		break;
	}
	case TUNER_XC5000C:
	{
		struct xc5000_config xc5000c_cfg = {
			.i2c_address = t->i2c->addr,
			/* if_khz will be set at dvb_attach() */
			.if_khz	  = 0,
			.chip_id  = XC5000C,
		};

		if (!dvb_attach(xc5000_attach,
				&t->fe, t->i2c->adapter, &xc5000c_cfg))
			goto attach_failed;
		tune_now = 0;
		break;
	}
	case TUNER_NXP_TDA18271:
	{
		struct tda18271_config cfg = {
			.small_i2c = TDA18271_03_BYTE_CHUNK_INIT,
		};

		if (!dvb_attach(tda18271_attach, &t->fe, t->i2c->addr,
				t->i2c->adapter, &cfg))
			goto attach_failed;
		tune_now = 0;
		break;
	}
	case TUNER_XC4000:
	{
		struct xc4000_config xc4000_cfg = {
			.i2c_address	  = t->i2c->addr,
			/* FIXME: the correct parameters will be set */
			/* only when the digital dvb_attach() occurs */
			.default_pm	  = 0,
			.dvb_amplitude	  = 0,
			.set_smoothedcvbs = 0,
			.if_khz		  = 0
		};
		if (!dvb_attach(xc4000_attach,
				&t->fe, t->i2c->adapter, &xc4000_cfg))
			goto attach_failed;
		tune_now = 0;
		break;
	}
	default:
		if (!dvb_attach(simple_tuner_attach, &t->fe,
				t->i2c->adapter, t->i2c->addr, t->type))
			goto attach_failed;

		break;
	}

	if ((NULL == analog_ops->set_params) &&
	    (fe_tuner_ops->set_analog_params)) {

		t->name = fe_tuner_ops->info.name;

		t->fe.analog_demod_priv = t;
		memcpy(analog_ops, &tuner_analog_ops,
		       sizeof(struct analog_demod_ops));

		if (fe_tuner_ops->get_rf_strength)
			analog_ops->has_signal = fe_tuner_ops->get_rf_strength;
		if (fe_tuner_ops->get_afc)
			analog_ops->get_afc = fe_tuner_ops->get_afc;

	} else {
		t->name = analog_ops->info.name;
	}

	tuner_dbg("type set to %s\n", t->name);

	t->mode_mask = new_mode_mask;

	/* Some tuners require more initialization setup before use,
	   such as firmware download or device calibration.
	   trying to set a frequency here will just fail
	   FIXME: better to move set_freq to the tuner code. This is needed
	   on analog tuners for PLL to properly work
	 */
	if (tune_now) {
		if (V4L2_TUNER_RADIO == t->mode)
			set_radio_freq(c, t->radio_freq);
		else
			set_tv_freq(c, t->tv_freq);
	}

	tuner_dbg("%s %s I2C addr 0x%02x with type %d used for 0x%02x\n",
		  c->adapter->name, c->dev.driver->name, c->addr << 1, type,
		  t->mode_mask);
	return;

attach_failed:
	tuner_dbg("Tuner attach for type = %d failed.\n", t->type);
	t->type = TUNER_ABSENT;

	return;
}

/**
 * tuner_s_type_addr - Sets the tuner type for a device
 *
 * @sd:		subdev descriptor
 * @tun_setup:	type to be associated to a given tuner i2c address
 *
 * This function applys the tuner config to tuner specified
 * by tun_setup structure.
 * If tuner I2C address is UNSET, then it will only set the device
 * if the tuner supports the mode specified in the call.
 * If the address is specified, the change will be applied only if
 * tuner I2C address matches.
 * The call can change the tuner number and the tuner mode.
 */
static int tuner_s_type_addr(struct v4l2_subdev *sd,
			     struct tuner_setup *tun_setup)
{
	struct tuner *t = to_tuner(sd);
	struct i2c_client *c = v4l2_get_subdevdata(sd);

	tuner_dbg("Calling set_type_addr for type=%d, addr=0x%02x, mode=0x%02x, config=%p\n",
			tun_setup->type,
			tun_setup->addr,
			tun_setup->mode_mask,
			tun_setup->config);

	if ((t->type == UNSET && ((tun_setup->addr == ADDR_UNSET) &&
	    (t->mode_mask & tun_setup->mode_mask))) ||
	    (tun_setup->addr == c->addr)) {
		set_type(c, tun_setup->type, tun_setup->mode_mask,
			 tun_setup->config, tun_setup->tuner_callback);
	} else
		tuner_dbg("set addr discarded for type %i, mask %x. "
			  "Asked to change tuner at addr 0x%02x, with mask %x\n",
			  t->type, t->mode_mask,
			  tun_setup->addr, tun_setup->mode_mask);

	return 0;
}

/**
 * tuner_s_config - Sets tuner configuration
 *
 * @sd:		subdev descriptor
 * @cfg:	tuner configuration
 *
 * Calls tuner set_config() private function to set some tuner-internal
 * parameters
 */
static int tuner_s_config(struct v4l2_subdev *sd,
			  const struct v4l2_priv_tun_config *cfg)
{
	struct tuner *t = to_tuner(sd);
	struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;

	if (t->type != cfg->tuner)
		return 0;

	if (analog_ops->set_config) {
		analog_ops->set_config(&t->fe, cfg->priv);
		return 0;
	}

	tuner_dbg("Tuner frontend module has no way to set config\n");
	return 0;
}

/**
 * tuner_lookup - Seek for tuner adapters
 *
 * @adap:	i2c_adapter struct
 * @radio:	pointer to be filled if the adapter is radio
 * @tv:		pointer to be filled if the adapter is TV
 *
 * Search for existing radio and/or TV tuners on the given I2C adapter,
 * discarding demod-only adapters (tda9887).
 *
 * Note that when this function is called from tuner_probe you can be
 * certain no other devices will be added/deleted at the same time, I2C
 * core protects against that.
 */
static void tuner_lookup(struct i2c_adapter *adap,
		struct tuner **radio, struct tuner **tv)
{
	struct tuner *pos;

	*radio = NULL;
	*tv = NULL;

	list_for_each_entry(pos, &tuner_list, list) {
		int mode_mask;

		if (pos->i2c->adapter != adap ||
		    strcmp(pos->i2c->dev.driver->name, "tuner"))
			continue;

		mode_mask = pos->mode_mask;
		if (*radio == NULL && mode_mask == T_RADIO)
			*radio = pos;
		/* Note: currently TDA9887 is the only demod-only
		   device. If other devices appear then we need to
		   make this test more general. */
		else if (*tv == NULL && pos->type != TUNER_TDA9887 &&
			 (pos->mode_mask & T_ANALOG_TV))
			*tv = pos;
	}
}

/**
 *tuner_probe - Probes the existing tuners on an I2C bus
 *
 * @client:	i2c_client descriptor
 * @id:		not used
 *
 * This routine probes for tuners at the expected I2C addresses. On most
 * cases, if a device answers to a given I2C address, it assumes that the
 * device is a tuner. On a few cases, however, an additional logic is needed
 * to double check if the device is really a tuner, or to identify the tuner
 * type, like on tea5767/5761 devices.
 *
 * During client attach, set_type is called by adapter's attach_inform callback.
 * set_type must then be completed by tuner_probe.
 */
static int tuner_probe(struct i2c_client *client,
		       const struct i2c_device_id *id)
{
	struct tuner *t;
	struct tuner *radio;
	struct tuner *tv;

	t = kzalloc(sizeof(struct tuner), GFP_KERNEL);
	if (NULL == t)
		return -ENOMEM;
	v4l2_i2c_subdev_init(&t->sd, client, &tuner_ops);
	t->i2c = client;
	t->name = "(tuner unset)";
	t->type = UNSET;
	t->audmode = V4L2_TUNER_MODE_STEREO;
	t->standby = true;
	t->radio_freq = 87.5 * 16000;	/* Initial freq range */
	t->tv_freq = 400 * 16; /* Sets freq to VHF High - needed for some PLL's to properly start */

	if (show_i2c) {
		unsigned char buffer[16];
		int i, rc;

		memset(buffer, 0, sizeof(buffer));
		rc = i2c_master_recv(client, buffer, sizeof(buffer));
		tuner_info("I2C RECV = ");
		for (i = 0; i < rc; i++)
			printk(KERN_CONT "%02x ", buffer[i]);
		printk("\n");
	}

	/* autodetection code based on the i2c addr */
	if (!no_autodetect) {
		switch (client->addr) {
		case 0x10:
			if (tuner_symbol_probe(tea5761_autodetection,
					       t->i2c->adapter,
					       t->i2c->addr) >= 0) {
				t->type = TUNER_TEA5761;
				t->mode_mask = T_RADIO;
				tuner_lookup(t->i2c->adapter, &radio, &tv);
				if (tv)
					tv->mode_mask &= ~T_RADIO;

				goto register_client;
			}
			kfree(t);
			return -ENODEV;
		case 0x42:
		case 0x43:
		case 0x4a:
		case 0x4b:
			/* If chip is not tda8290, don't register.
			   since it can be tda9887*/
			if (tuner_symbol_probe(tda829x_probe, t->i2c->adapter,
					       t->i2c->addr) >= 0) {
				tuner_dbg("tda829x detected\n");
			} else {
				/* Default is being tda9887 */
				t->type = TUNER_TDA9887;
				t->mode_mask = T_RADIO | T_ANALOG_TV;
				goto register_client;
			}
			break;
		case 0x60:
			if (tuner_symbol_probe(tea5767_autodetection,
					       t->i2c->adapter, t->i2c->addr)
					>= 0) {
				t->type = TUNER_TEA5767;
				t->mode_mask = T_RADIO;
				/* Sets freq to FM range */
				tuner_lookup(t->i2c->adapter, &radio, &tv);
				if (tv)
					tv->mode_mask &= ~T_RADIO;

				goto register_client;
			}
			break;
		}
	}

	/* Initializes only the first TV tuner on this adapter. Why only the
	   first? Because there are some devices (notably the ones with TI
	   tuners) that have more than one i2c address for the *same* device.
	   Experience shows that, except for just one case, the first
	   address is the right one. The exception is a Russian tuner
	   (ACORP_Y878F). So, the desired behavior is just to enable the
	   first found TV tuner. */
	tuner_lookup(t->i2c->adapter, &radio, &tv);
	if (tv == NULL) {
		t->mode_mask = T_ANALOG_TV;
		if (radio == NULL)
			t->mode_mask |= T_RADIO;
		tuner_dbg("Setting mode_mask to 0x%02x\n", t->mode_mask);
	}

	/* Should be just before return */
register_client:
	/* Sets a default mode */
	if (t->mode_mask & T_ANALOG_TV)
		t->mode = V4L2_TUNER_ANALOG_TV;
	else
		t->mode = V4L2_TUNER_RADIO;
	set_type(client, t->type, t->mode_mask, t->config, t->fe.callback);
	list_add_tail(&t->list, &tuner_list);

	tuner_info("Tuner %d found with type(s)%s%s.\n",
		   t->type,
		   t->mode_mask & T_RADIO ? " Radio" : "",
		   t->mode_mask & T_ANALOG_TV ? " TV" : "");
	return 0;
}

/**
 * tuner_remove - detaches a tuner
 *
 * @client:	i2c_client descriptor
 */

static int tuner_remove(struct i2c_client *client)
{
	struct tuner *t = to_tuner(i2c_get_clientdata(client));

	v4l2_device_unregister_subdev(&t->sd);
	tuner_detach(&t->fe);
	t->fe.analog_demod_priv = NULL;

	list_del(&t->list);
	kfree(t);
	return 0;
}

/*
 * Functions to switch between Radio and TV
 *
 * A few cards have a separate I2C tuner for radio. Those routines
 * take care of switching between TV/Radio mode, filtering only the
 * commands that apply to the Radio or TV tuner.
 */

/**
 * check_mode - Verify if tuner supports the requested mode
 * @t: a pointer to the module's internal struct_tuner
 *
 * This function checks if the tuner is capable of tuning analog TV,
 * digital TV or radio, depending on what the caller wants. If the
 * tuner can't support that mode, it returns -EINVAL. Otherwise, it
 * returns 0.
 * This function is needed for boards that have a separate tuner for
 * radio (like devices with tea5767).
 * NOTE: mt20xx uses V4L2_TUNER_DIGITAL_TV and calls set_tv_freq to
 *       select a TV frequency. So, t_mode = T_ANALOG_TV could actually
 *	 be used to represent a Digital TV too.
 */
static inline int check_mode(struct tuner *t, enum v4l2_tuner_type mode)
{
	int t_mode;
	if (mode == V4L2_TUNER_RADIO)
		t_mode = T_RADIO;
	else
		t_mode = T_ANALOG_TV;

	if ((t_mode & t->mode_mask) == 0)
		return -EINVAL;

	return 0;
}

/**
 * set_mode - Switch tuner to other mode.
 * @t:		a pointer to the module's internal struct_tuner
 * @mode:	enum v4l2_type (radio or TV)
 *
 * If tuner doesn't support the needed mode (radio or TV), prints a
 * debug message and returns -EINVAL, changing its state to standby.
 * Otherwise, changes the mode and returns 0.
 */
static int set_mode(struct tuner *t, enum v4l2_tuner_type mode)
{
	struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;

	if (mode != t->mode) {
		if (check_mode(t, mode) == -EINVAL) {
			tuner_dbg("Tuner doesn't support mode %d. "
				  "Putting tuner to sleep\n", mode);
			t->standby = true;
			if (analog_ops->standby)
				analog_ops->standby(&t->fe);
			return -EINVAL;
		}
		t->mode = mode;
		tuner_dbg("Changing to mode %d\n", mode);
	}
	return 0;
}

/**
 * set_freq - Set the tuner to the desired frequency.
 * @t:		a pointer to the module's internal struct_tuner
 * @freq:	frequency to set (0 means to use the current frequency)
 */
static void set_freq(struct tuner *t, unsigned int freq)
{
	struct i2c_client *client = v4l2_get_subdevdata(&t->sd);

	if (t->mode == V4L2_TUNER_RADIO) {
		if (!freq)
			freq = t->radio_freq;
		set_radio_freq(client, freq);
	} else {
		if (!freq)
			freq = t->tv_freq;
		set_tv_freq(client, freq);
	}
}

/*
 * Functions that are specific for TV mode
 */

/**
 * set_tv_freq - Set tuner frequency,  freq in Units of 62.5 kHz = 1/16MHz
 *
 * @c:	i2c_client descriptor
 * @freq: frequency
 */
static void set_tv_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = to_tuner(i2c_get_clientdata(c));
	struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;

	struct analog_parameters params = {
		.mode      = t->mode,
		.audmode   = t->audmode,
		.std       = t->std
	};

	if (t->type == UNSET) {
		tuner_warn("tuner type not set\n");
		return;
	}
	if (NULL == analog_ops->set_params) {
		tuner_warn("Tuner has no way to set tv freq\n");
		return;
	}
	if (freq < tv_range[0] * 16 || freq > tv_range[1] * 16) {
		tuner_dbg("TV freq (%d.%02d) out of range (%d-%d)\n",
			   freq / 16, freq % 16 * 100 / 16, tv_range[0],
			   tv_range[1]);
		/* V4L2 spec: if the freq is not possible then the closest
		   possible value should be selected */
		if (freq < tv_range[0] * 16)
			freq = tv_range[0] * 16;
		else
			freq = tv_range[1] * 16;
	}
	params.frequency = freq;
	tuner_dbg("tv freq set to %d.%02d\n",
			freq / 16, freq % 16 * 100 / 16);
	t->tv_freq = freq;
	t->standby = false;

	analog_ops->set_params(&t->fe, &params);
}

/**
 * tuner_fixup_std - force a given video standard variant
 *
 * @t: tuner internal struct
 * @std:	TV standard
 *
 * A few devices or drivers have problem to detect some standard variations.
 * On other operational systems, the drivers generally have a per-country
 * code, and some logic to apply per-country hacks. V4L2 API doesn't provide
 * such hacks. Instead, it relies on a proper video standard selection from
 * the userspace application. However, as some apps are buggy, not allowing
 * to distinguish all video standard variations, a modprobe parameter can
 * be used to force a video standard match.
 */
static v4l2_std_id tuner_fixup_std(struct tuner *t, v4l2_std_id std)
{
	if (pal[0] != '-' && (std & V4L2_STD_PAL) == V4L2_STD_PAL) {
		switch (pal[0]) {
		case '6':
			return V4L2_STD_PAL_60;
		case 'b':
		case 'B':
		case 'g':
		case 'G':
			return V4L2_STD_PAL_BG;
		case 'i':
		case 'I':
			return V4L2_STD_PAL_I;
		case 'd':
		case 'D':
		case 'k':
		case 'K':
			return V4L2_STD_PAL_DK;
		case 'M':
		case 'm':
			return V4L2_STD_PAL_M;
		case 'N':
		case 'n':
			if (pal[1] == 'c' || pal[1] == 'C')
				return V4L2_STD_PAL_Nc;
			return V4L2_STD_PAL_N;
		default:
			tuner_warn("pal= argument not recognised\n");
			break;
		}
	}
	if (secam[0] != '-' && (std & V4L2_STD_SECAM) == V4L2_STD_SECAM) {
		switch (secam[0]) {
		case 'b':
		case 'B':
		case 'g':
		case 'G':
		case 'h':
		case 'H':
			return V4L2_STD_SECAM_B |
			       V4L2_STD_SECAM_G |
			       V4L2_STD_SECAM_H;
		case 'd':
		case 'D':
		case 'k':
		case 'K':
			return V4L2_STD_SECAM_DK;
		case 'l':
		case 'L':
			if ((secam[1] == 'C') || (secam[1] == 'c'))
				return V4L2_STD_SECAM_LC;
			return V4L2_STD_SECAM_L;
		default:
			tuner_warn("secam= argument not recognised\n");
			break;
		}
	}

	if (ntsc[0] != '-' && (std & V4L2_STD_NTSC) == V4L2_STD_NTSC) {
		switch (ntsc[0]) {
		case 'm':
		case 'M':
			return V4L2_STD_NTSC_M;
		case 'j':
		case 'J':
			return V4L2_STD_NTSC_M_JP;
		case 'k':
		case 'K':
			return V4L2_STD_NTSC_M_KR;
		default:
			tuner_info("ntsc= argument not recognised\n");
			break;
		}
	}
	return std;
}

/*
 * Functions that are specific for Radio mode
 */

/**
 * set_radio_freq - Set tuner frequency,  freq in Units of 62.5 Hz  = 1/16kHz
 *
 * @c:	i2c_client descriptor
 * @freq: frequency
 */
static void set_radio_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = to_tuner(i2c_get_clientdata(c));
	struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;

	struct analog_parameters params = {
		.mode      = t->mode,
		.audmode   = t->audmode,
		.std       = t->std
	};

	if (t->type == UNSET) {
		tuner_warn("tuner type not set\n");
		return;
	}
	if (NULL == analog_ops->set_params) {
		tuner_warn("tuner has no way to set radio frequency\n");
		return;
	}
	if (freq < radio_range[0] * 16000 || freq > radio_range[1] * 16000) {
		tuner_dbg("radio freq (%d.%02d) out of range (%d-%d)\n",
			   freq / 16000, freq % 16000 * 100 / 16000,
			   radio_range[0], radio_range[1]);
		/* V4L2 spec: if the freq is not possible then the closest
		   possible value should be selected */
		if (freq < radio_range[0] * 16000)
			freq = radio_range[0] * 16000;
		else
			freq = radio_range[1] * 16000;
	}
	params.frequency = freq;
	tuner_dbg("radio freq set to %d.%02d\n",
			freq / 16000, freq % 16000 * 100 / 16000);
	t->radio_freq = freq;
	t->standby = false;

	analog_ops->set_params(&t->fe, &params);
	/*
	 * The tuner driver might decide to change the audmode if it only
	 * supports stereo, so update t->audmode.
	 */
	t->audmode = params.audmode;
}

/*
 * Debug function for reporting tuner status to userspace
 */

/**
 * tuner_status - Dumps the current tuner status at dmesg
 * @fe: pointer to struct dvb_frontend
 *
 * This callback is used only for driver debug purposes, answering to
 * VIDIOC_LOG_STATUS. No changes should happen on this call.
 */
static void tuner_status(struct dvb_frontend *fe)
{
	struct tuner *t = fe->analog_demod_priv;
	unsigned long freq, freq_fraction;
	struct dvb_tuner_ops *fe_tuner_ops = &fe->ops.tuner_ops;
	struct analog_demod_ops *analog_ops = &fe->ops.analog_ops;
	const char *p;

	switch (t->mode) {
	case V4L2_TUNER_RADIO:
		p = "radio";
		break;
	case V4L2_TUNER_DIGITAL_TV: /* Used by mt20xx */
		p = "digital TV";
		break;
	case V4L2_TUNER_ANALOG_TV:
	default:
		p = "analog TV";
		break;
	}
	if (t->mode == V4L2_TUNER_RADIO) {
		freq = t->radio_freq / 16000;
		freq_fraction = (t->radio_freq % 16000) * 100 / 16000;
	} else {
		freq = t->tv_freq / 16;
		freq_fraction = (t->tv_freq % 16) * 100 / 16;
	}
	tuner_info("Tuner mode:      %s%s\n", p,
		   t->standby ? " on standby mode" : "");
	tuner_info("Frequency:       %lu.%02lu MHz\n", freq, freq_fraction);
	tuner_info("Standard:        0x%08lx\n", (unsigned long)t->std);
	if (t->mode != V4L2_TUNER_RADIO)
		return;
	if (fe_tuner_ops->get_status) {
		u32 tuner_status;

		fe_tuner_ops->get_status(&t->fe, &tuner_status);
		if (tuner_status & TUNER_STATUS_LOCKED)
			tuner_info("Tuner is locked.\n");
		if (tuner_status & TUNER_STATUS_STEREO)
			tuner_info("Stereo:          yes\n");
	}
	if (analog_ops->has_signal) {
		u16 signal;

		if (!analog_ops->has_signal(fe, &signal))
			tuner_info("Signal strength: %hu\n", signal);
	}
}

/*
 * Function to splicitly change mode to radio. Probably not needed anymore
 */

static int tuner_s_radio(struct v4l2_subdev *sd)
{
	struct tuner *t = to_tuner(sd);

	if (set_mode(t, V4L2_TUNER_RADIO) == 0)
		set_freq(t, 0);
	return 0;
}

/*
 * Tuner callbacks to handle userspace ioctl's
 */

/**
 * tuner_s_power - controls the power state of the tuner
 * @sd: pointer to struct v4l2_subdev
 * @on: a zero value puts the tuner to sleep, non-zero wakes it up
 */
static int tuner_s_power(struct v4l2_subdev *sd, int on)
{
	struct tuner *t = to_tuner(sd);
	struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;

	if (on) {
		if (t->standby && set_mode(t, t->mode) == 0) {
			tuner_dbg("Waking up tuner\n");
			set_freq(t, 0);
		}
		return 0;
	}

	tuner_dbg("Putting tuner to sleep\n");
	t->standby = true;
	if (analog_ops->standby)
		analog_ops->standby(&t->fe);
	return 0;
}

static int tuner_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
{
	struct tuner *t = to_tuner(sd);

	if (set_mode(t, V4L2_TUNER_ANALOG_TV))
		return 0;

	t->std = tuner_fixup_std(t, std);
	if (t->std != std)
		tuner_dbg("Fixup standard %llx to %llx\n", std, t->std);
	set_freq(t, 0);
	return 0;
}

static int tuner_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f)
{
	struct tuner *t = to_tuner(sd);

	if (set_mode(t, f->type) == 0)
		set_freq(t, f->frequency);
	return 0;
}

/**
 * tuner_g_frequency - Get the tuned frequency for the tuner
 * @sd: pointer to struct v4l2_subdev
 * @f: pointer to struct v4l2_frequency
 *
 * At return, the structure f will be filled with tuner frequency
 * if the tuner matches the f->type.
 * Note: f->type should be initialized before calling it.
 * This is done by either video_ioctl2 or by the bridge driver.
 */
static int tuner_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
{
	struct tuner *t = to_tuner(sd);
	struct dvb_tuner_ops *fe_tuner_ops = &t->fe.ops.tuner_ops;

	if (check_mode(t, f->type) == -EINVAL)
		return 0;
	if (f->type == t->mode && fe_tuner_ops->get_frequency && !t->standby) {
		u32 abs_freq;

		fe_tuner_ops->get_frequency(&t->fe, &abs_freq);
		f->frequency = (V4L2_TUNER_RADIO == t->mode) ?
			DIV_ROUND_CLOSEST(abs_freq * 2, 125) :
			DIV_ROUND_CLOSEST(abs_freq, 62500);
	} else {
		f->frequency = (V4L2_TUNER_RADIO == f->type) ?
			t->radio_freq : t->tv_freq;
	}
	return 0;
}

/**
 * tuner_g_tuner - Fill in tuner information
 * @sd: pointer to struct v4l2_subdev
 * @vt: pointer to struct v4l2_tuner
 *
 * At return, the structure vt will be filled with tuner information
 * if the tuner matches vt->type.
 * Note: vt->type should be initialized before calling it.
 * This is done by either video_ioctl2 or by the bridge driver.
 */
static int tuner_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
{
	struct tuner *t = to_tuner(sd);
	struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;
	struct dvb_tuner_ops *fe_tuner_ops = &t->fe.ops.tuner_ops;

	if (check_mode(t, vt->type) == -EINVAL)
		return 0;
	if (vt->type == t->mode && analog_ops->get_afc)
		analog_ops->get_afc(&t->fe, &vt->afc);
	if (vt->type == t->mode && analog_ops->has_signal) {
		u16 signal = (u16)vt->signal;

		if (!analog_ops->has_signal(&t->fe, &signal))
			vt->signal = signal;
	}
	if (vt->type != V4L2_TUNER_RADIO) {
		vt->capability |= V4L2_TUNER_CAP_NORM;
		vt->rangelow = tv_range[0] * 16;
		vt->rangehigh = tv_range[1] * 16;
		return 0;
	}

	/* radio mode */
	if (vt->type == t->mode) {
		vt->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
		if (fe_tuner_ops->get_status) {
			u32 tuner_status;

			fe_tuner_ops->get_status(&t->fe, &tuner_status);
			vt->rxsubchans =
				(tuner_status & TUNER_STATUS_STEREO) ?
				V4L2_TUNER_SUB_STEREO :
				V4L2_TUNER_SUB_MONO;
		}
		vt->audmode = t->audmode;
	}
	vt->capability |= V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
	vt->rangelow = radio_range[0] * 16000;
	vt->rangehigh = radio_range[1] * 16000;

	return 0;
}

/**
 * tuner_s_tuner - Set the tuner's audio mode
 * @sd: pointer to struct v4l2_subdev
 * @vt: pointer to struct v4l2_tuner
 *
 * Sets the audio mode if the tuner matches vt->type.
 * Note: vt->type should be initialized before calling it.
 * This is done by either video_ioctl2 or by the bridge driver.
 */
static int tuner_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
{
	struct tuner *t = to_tuner(sd);

	if (set_mode(t, vt->type))
		return 0;

	if (t->mode == V4L2_TUNER_RADIO) {
		t->audmode = vt->audmode;
		/*
		 * For radio audmode can only be mono or stereo. Map any
		 * other values to stereo. The actual tuner driver that is
		 * called in set_radio_freq can decide to limit the audmode to
		 * mono if only mono is supported.
		 */
		if (t->audmode != V4L2_TUNER_MODE_MONO &&
		    t->audmode != V4L2_TUNER_MODE_STEREO)
			t->audmode = V4L2_TUNER_MODE_STEREO;
	}
	set_freq(t, 0);

	return 0;
}

static int tuner_log_status(struct v4l2_subdev *sd)
{
	struct tuner *t = to_tuner(sd);
	struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;

	if (analog_ops->tuner_status)
		analog_ops->tuner_status(&t->fe);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int tuner_suspend(struct device *dev)
{
	struct i2c_client *c = to_i2c_client(dev);
	struct tuner *t = to_tuner(i2c_get_clientdata(c));
	struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;

	tuner_dbg("suspend\n");

	if (t->fe.ops.tuner_ops.suspend)
		t->fe.ops.tuner_ops.suspend(&t->fe);
	else if (!t->standby && analog_ops->standby)
		analog_ops->standby(&t->fe);

	return 0;
}

static int tuner_resume(struct device *dev)
{
	struct i2c_client *c = to_i2c_client(dev);
	struct tuner *t = to_tuner(i2c_get_clientdata(c));

	tuner_dbg("resume\n");

	if (t->fe.ops.tuner_ops.resume)
		t->fe.ops.tuner_ops.resume(&t->fe);
	else if (!t->standby)
		if (set_mode(t, t->mode) == 0)
			set_freq(t, 0);

	return 0;
}
#endif

static int tuner_command(struct i2c_client *client, unsigned cmd, void *arg)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	/* TUNER_SET_CONFIG is still called by tuner-simple.c, so we have
	   to handle it here.
	   There must be a better way of doing this... */
	switch (cmd) {
	case TUNER_SET_CONFIG:
		return tuner_s_config(sd, arg);
	}
	return -ENOIOCTLCMD;
}

/*
 * Callback structs
 */

static const struct v4l2_subdev_core_ops tuner_core_ops = {
	.log_status = tuner_log_status,
	.s_power = tuner_s_power,
};

static const struct v4l2_subdev_tuner_ops tuner_tuner_ops = {
	.s_radio = tuner_s_radio,
	.g_tuner = tuner_g_tuner,
	.s_tuner = tuner_s_tuner,
	.s_frequency = tuner_s_frequency,
	.g_frequency = tuner_g_frequency,
	.s_type_addr = tuner_s_type_addr,
	.s_config = tuner_s_config,
};

static const struct v4l2_subdev_video_ops tuner_video_ops = {
	.s_std = tuner_s_std,
};

static const struct v4l2_subdev_ops tuner_ops = {
	.core = &tuner_core_ops,
	.tuner = &tuner_tuner_ops,
	.video = &tuner_video_ops,
};

/*
 * I2C structs and module init functions
 */

static const struct dev_pm_ops tuner_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(tuner_suspend, tuner_resume)
};

static const struct i2c_device_id tuner_id[] = {
	{ "tuner", }, /* autodetect */
	{ }
};
MODULE_DEVICE_TABLE(i2c, tuner_id);

static struct i2c_driver tuner_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "tuner",
		.pm	= &tuner_pm_ops,
	},
	.probe		= tuner_probe,
	.remove		= tuner_remove,
	.command	= tuner_command,
	.id_table	= tuner_id,
};

module_i2c_driver(tuner_driver);

MODULE_DESCRIPTION("device driver for various TV and TV+FM radio tuners");
MODULE_AUTHOR("Ralph Metzler, Gerd Knorr, Gunther Mayer");
MODULE_LICENSE("GPL");