summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb-frontends/cx24120.c
blob: 066ee387bf250894b1067b023b2d1d760790ad02 (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
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
/*
    Conexant cx24120/cx24118 - DVBS/S2 Satellite demod/tuner driver

    Copyright (C) 2008 Patrick Boettcher <pb@linuxtv.org>
    Copyright (C) 2009 Sergey Tyurin <forum.free-x.de>
    Updated 2012 by Jannis Achstetter <jannis_achstetter@web.de>
    Copyright (C) 2015 Jemma Denson <jdenson@gmail.com>
	April 2015
	    Refactored & simplified driver
	    Updated to work with delivery system supplied by DVBv5
	    Add frequency, fec & pilot to get_frontend

	Cards supported: Technisat Skystar S2

    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.
*/

#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/firmware.h>
#include "dvb_frontend.h"
#include "cx24120.h"

#define CX24120_SEARCH_RANGE_KHZ 5000
#define CX24120_FIRMWARE "dvb-fe-cx24120-1.20.58.2.fw"

/* cx24120 i2c registers  */
#define CX24120_REG_CMD_START	0x00		/* write cmd_id */
#define CX24120_REG_CMD_ARGS	0x01		/* write command arguments */
#define CX24120_REG_CMD_END	0x1f		/* write 0x01 for end */

#define CX24120_REG_MAILBOX	0x33
#define CX24120_REG_FREQ3	0x34		/* frequency */
#define CX24120_REG_FREQ2	0x35
#define CX24120_REG_FREQ1	0x36

#define CX24120_REG_FECMODE	0x39		/* FEC status */
#define CX24120_REG_STATUS	0x3a		/* Tuner status */
#define CX24120_REG_SIGSTR_H	0x3a		/* Signal strength high */
#define CX24120_REG_SIGSTR_L	0x3b		/* Signal strength low byte */
#define CX24120_REG_QUALITY_H	0x40		/* SNR high byte */
#define CX24120_REG_QUALITY_L	0x41		/* SNR low byte */

#define CX24120_REG_BER_HH	0x47		/* BER high byte of high word */
#define CX24120_REG_BER_HL	0x48		/* BER low byte of high word */
#define CX24120_REG_BER_LH	0x49		/* BER high byte of low word */
#define CX24120_REG_BER_LL	0x4a		/* BER low byte of low word */

#define CX24120_REG_UCB_H	0x50		/* UCB high byte */
#define CX24120_REG_UCB_L	0x51		/* UCB low byte  */

#define CX24120_REG_CLKDIV	0xe6
#define CX24120_REG_RATEDIV	0xf0

#define CX24120_REG_REVISION	0xff		/* Chip revision (ro) */

/* Command messages */
enum command_message_id {
	CMD_VCO_SET		= 0x10,		/* cmd.len = 12; */
	CMD_TUNEREQUEST		= 0x11,		/* cmd.len = 15; */

	CMD_MPEG_ONOFF		= 0x13,		/* cmd.len = 4; */
	CMD_MPEG_INIT		= 0x14,		/* cmd.len = 7; */
	CMD_BANDWIDTH		= 0x15,		/* cmd.len = 12; */
	CMD_CLOCK_READ		= 0x16,		/* read clock */
	CMD_CLOCK_SET		= 0x17,		/* cmd.len = 10; */

	CMD_DISEQC_MSG1		= 0x20,		/* cmd.len = 11; */
	CMD_DISEQC_MSG2		= 0x21,		/* cmd.len = d->msg_len + 6; */
	CMD_SETVOLTAGE		= 0x22,		/* cmd.len = 2; */
	CMD_SETTONE		= 0x23,		/* cmd.len = 4; */
	CMD_DISEQC_BURST	= 0x24,		/* cmd.len not used !!! */

	CMD_READ_SNR		= 0x1a,		/* Read signal strength */
	CMD_START_TUNER		= 0x1b,		/* ??? */

	CMD_FWVERSION		= 0x35,

	CMD_BER_CTRL		= 0x3c,		/* cmd.len = 0x03; */
};

#define CX24120_MAX_CMD_LEN	30

/* pilot mask */
#define CX24120_PILOT_OFF	0x00
#define CX24120_PILOT_ON	0x40
#define CX24120_PILOT_AUTO	0x80

/* signal status */
#define CX24120_HAS_SIGNAL	0x01
#define CX24120_HAS_CARRIER	0x02
#define CX24120_HAS_VITERBI	0x04
#define CX24120_HAS_LOCK	0x08
#define CX24120_HAS_UNK1	0x10
#define CX24120_HAS_UNK2	0x20
#define CX24120_STATUS_MASK	0x0f
#define CX24120_SIGNAL_MASK	0xc0

/* ber window */
#define CX24120_BER_WINDOW	16
#define CX24120_BER_WSIZE	((1 << CX24120_BER_WINDOW) * 208 * 8)

#define info(args...) pr_info("cx24120: " args)
#define err(args...)  pr_err("cx24120: ### ERROR: " args)

/* The Demod/Tuner can't easily provide these, we cache them */
struct cx24120_tuning {
	u32 frequency;
	u32 symbol_rate;
	enum fe_spectral_inversion inversion;
	enum fe_code_rate fec;

	enum fe_delivery_system delsys;
	enum fe_modulation modulation;
	enum fe_pilot pilot;

	/* Demod values */
	u8 fec_val;
	u8 fec_mask;
	u8 clkdiv;
	u8 ratediv;
	u8 inversion_val;
	u8 pilot_val;
};

/* Private state */
struct cx24120_state {
	struct i2c_adapter *i2c;
	const struct cx24120_config *config;
	struct dvb_frontend frontend;

	u8 cold_init;
	u8 mpeg_enabled;
	u8 need_clock_set;

	/* current and next tuning parameters */
	struct cx24120_tuning dcur;
	struct cx24120_tuning dnxt;

	enum fe_status fe_status;

	/* dvbv5 stats calculations */
	u32 bitrate;
	u32 berw_usecs;
	u32 ber_prev;
	u32 ucb_offset;
	unsigned long ber_jiffies_stats;
	unsigned long per_jiffies_stats;
};

/* Command message to firmware */
struct cx24120_cmd {
	u8 id;
	u8 len;
	u8 arg[CX24120_MAX_CMD_LEN];
};

/* Read single register */
static int cx24120_readreg(struct cx24120_state *state, u8 reg)
{
	int ret;
	u8 buf = 0;
	struct i2c_msg msg[] = {
		{
			.addr = state->config->i2c_addr,
			.flags = 0,
			.len = 1,
			.buf = &reg
		}, {
			.addr = state->config->i2c_addr,
			.flags = I2C_M_RD,
			.len = 1,
			.buf = &buf
		}
	};

	ret = i2c_transfer(state->i2c, msg, 2);
	if (ret != 2) {
		err("Read error: reg=0x%02x, ret=%i)\n", reg, ret);
		return ret;
	}

	dev_dbg(&state->i2c->dev, "reg=0x%02x; data=0x%02x\n", reg, buf);

	return buf;
}

/* Write single register */
static int cx24120_writereg(struct cx24120_state *state, u8 reg, u8 data)
{
	u8 buf[] = { reg, data };
	struct i2c_msg msg = {
		.addr = state->config->i2c_addr,
		.flags = 0,
		.buf = buf,
		.len = 2
	};
	int ret;

	ret = i2c_transfer(state->i2c, &msg, 1);
	if (ret != 1) {
		err("Write error: i2c_write error(err == %i, 0x%02x: 0x%02x)\n",
		    ret, reg, data);
		return ret;
	}

	dev_dbg(&state->i2c->dev, "reg=0x%02x; data=0x%02x\n", reg, data);

	return 0;
}

/* Write multiple registers in chunks of i2c_wr_max-sized buffers */
static int cx24120_writeregs(struct cx24120_state *state,
			     u8 reg, const u8 *values, u16 len, u8 incr)
{
	int ret;
	u16 max = state->config->i2c_wr_max > 0 ?
				state->config->i2c_wr_max :
				len;

	struct i2c_msg msg = {
		.addr = state->config->i2c_addr,
		.flags = 0,
	};

	msg.buf = kmalloc(max + 1, GFP_KERNEL);
	if (!msg.buf)
		return -ENOMEM;

	while (len) {
		msg.buf[0] = reg;
		msg.len = len > max ? max : len;
		memcpy(&msg.buf[1], values, msg.len);

		len    -= msg.len;      /* data length revers counter */
		values += msg.len;      /* incr data pointer */

		if (incr)
			reg += msg.len;
		msg.len++;              /* don't forget the addr byte */

		ret = i2c_transfer(state->i2c, &msg, 1);
		if (ret != 1) {
			err("i2c_write error(err == %i, 0x%02x)\n", ret, reg);
			goto out;
		}

		dev_dbg(&state->i2c->dev, "reg=0x%02x; data=%*ph\n",
			reg, msg.len - 1, msg.buf + 1);
	}

	ret = 0;

out:
	kfree(msg.buf);
	return ret;
}

static struct dvb_frontend_ops cx24120_ops;

struct dvb_frontend *cx24120_attach(const struct cx24120_config *config,
				    struct i2c_adapter *i2c)
{
	struct cx24120_state *state;
	int demod_rev;

	info("Conexant cx24120/cx24118 - DVBS/S2 Satellite demod/tuner\n");
	state = kzalloc(sizeof(*state), GFP_KERNEL);
	if (!state) {
		err("Unable to allocate memory for cx24120_state\n");
		goto error;
	}

	/* setup the state */
	state->config = config;
	state->i2c = i2c;

	/* check if the demod is present and has proper type */
	demod_rev = cx24120_readreg(state, CX24120_REG_REVISION);
	switch (demod_rev) {
	case 0x07:
		info("Demod cx24120 rev. 0x07 detected.\n");
		break;
	case 0x05:
		info("Demod cx24120 rev. 0x05 detected.\n");
		break;
	default:
		err("Unsupported demod revision: 0x%x detected.\n", demod_rev);
		goto error;
	}

	/* create dvb_frontend */
	state->cold_init = 0;
	memcpy(&state->frontend.ops, &cx24120_ops,
	       sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;

	info("Conexant cx24120/cx24118 attached.\n");
	return &state->frontend;

error:
	kfree(state);
	return NULL;
}
EXPORT_SYMBOL(cx24120_attach);

static int cx24120_test_rom(struct cx24120_state *state)
{
	int err, ret;

	err = cx24120_readreg(state, 0xfd);
	if (err & 4) {
		ret = cx24120_readreg(state, 0xdf) & 0xfe;
		err = cx24120_writereg(state, 0xdf, ret);
	}
	return err;
}

static int cx24120_read_snr(struct dvb_frontend *fe, u16 *snr)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	if (c->cnr.stat[0].scale != FE_SCALE_DECIBEL)
		*snr = 0;
	else
		*snr = div_s64(c->cnr.stat[0].svalue, 100);

	return 0;
}

static int cx24120_read_ber(struct dvb_frontend *fe, u32 *ber)
{
	struct cx24120_state *state = fe->demodulator_priv;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	if (c->post_bit_error.stat[0].scale != FE_SCALE_COUNTER) {
		*ber = 0;
		return 0;
	}

	*ber = c->post_bit_error.stat[0].uvalue - state->ber_prev;
	state->ber_prev = c->post_bit_error.stat[0].uvalue;

	return 0;
}

static int cx24120_msg_mpeg_output_global_config(struct cx24120_state *state,
						 u8 flag);

/* Check if we're running a command that needs to disable mpeg out */
static void cx24120_check_cmd(struct cx24120_state *state, u8 id)
{
	switch (id) {
	case CMD_TUNEREQUEST:
	case CMD_CLOCK_READ:
	case CMD_DISEQC_MSG1:
	case CMD_DISEQC_MSG2:
	case CMD_SETVOLTAGE:
	case CMD_SETTONE:
	case CMD_DISEQC_BURST:
		cx24120_msg_mpeg_output_global_config(state, 0);
		/* Old driver would do a msleep(100) here */
	default:
		return;
	}
}

/* Send a message to the firmware */
static int cx24120_message_send(struct cx24120_state *state,
				struct cx24120_cmd *cmd)
{
	int ficus;

	if (state->mpeg_enabled) {
		/* Disable mpeg out on certain commands */
		cx24120_check_cmd(state, cmd->id);
	}

	cx24120_writereg(state, CX24120_REG_CMD_START, cmd->id);
	cx24120_writeregs(state, CX24120_REG_CMD_ARGS, &cmd->arg[0],
			  cmd->len, 1);
	cx24120_writereg(state, CX24120_REG_CMD_END, 0x01);

	ficus = 1000;
	while (cx24120_readreg(state, CX24120_REG_CMD_END)) {
		msleep(20);
		ficus -= 20;
		if (ficus == 0) {
			err("Error sending message to firmware\n");
			return -EREMOTEIO;
		}
	}
	dev_dbg(&state->i2c->dev, "sent message 0x%02x\n", cmd->id);

	return 0;
}

/* Send a message and fill arg[] with the results */
static int cx24120_message_sendrcv(struct cx24120_state *state,
				   struct cx24120_cmd *cmd, u8 numreg)
{
	int ret, i;

	if (numreg > CX24120_MAX_CMD_LEN) {
		err("Too many registers to read. cmd->reg = %d", numreg);
		return -EREMOTEIO;
	}

	ret = cx24120_message_send(state, cmd);
	if (ret != 0)
		return ret;

	if (!numreg)
		return 0;

	/* Read numreg registers starting from register cmd->len */
	for (i = 0; i < numreg; i++)
		cmd->arg[i] = cx24120_readreg(state, (cmd->len + i + 1));

	return 0;
}

static int cx24120_read_signal_strength(struct dvb_frontend *fe,
					u16 *signal_strength)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	if (c->strength.stat[0].scale != FE_SCALE_RELATIVE)
		*signal_strength = 0;
	else
		*signal_strength = c->strength.stat[0].uvalue;

	return 0;
}

static int cx24120_msg_mpeg_output_global_config(struct cx24120_state *state,
						 u8 enable)
{
	struct cx24120_cmd cmd;
	int ret;

	cmd.id = CMD_MPEG_ONOFF;
	cmd.len = 4;
	cmd.arg[0] = 0x01;
	cmd.arg[1] = 0x00;
	cmd.arg[2] = enable ? 0 : (u8)(-1);
	cmd.arg[3] = 0x01;

	ret = cx24120_message_send(state, &cmd);
	if (ret != 0) {
		dev_dbg(&state->i2c->dev, "failed to %s MPEG output\n",
			enable ? "enable" : "disable");
		return ret;
	}

	state->mpeg_enabled = enable;
	dev_dbg(&state->i2c->dev, "MPEG output %s\n",
		enable ? "enabled" : "disabled");

	return 0;
}

static int cx24120_msg_mpeg_output_config(struct cx24120_state *state, u8 seq)
{
	struct cx24120_cmd cmd;
	struct cx24120_initial_mpeg_config i =
			state->config->initial_mpeg_config;

	cmd.id = CMD_MPEG_INIT;
	cmd.len = 7;
	cmd.arg[0] = seq; /* sequental number - can be 0,1,2 */
	cmd.arg[1] = ((i.x1 & 0x01) << 1) | ((i.x1 >> 1) & 0x01);
	cmd.arg[2] = 0x05;
	cmd.arg[3] = 0x02;
	cmd.arg[4] = ((i.x2 >> 1) & 0x01);
	cmd.arg[5] = (i.x2 & 0xf0) | (i.x3 & 0x0f);
	cmd.arg[6] = 0x10;

	return cx24120_message_send(state, &cmd);
}

static int cx24120_diseqc_send_burst(struct dvb_frontend *fe,
				     enum fe_sec_mini_cmd burst)
{
	struct cx24120_state *state = fe->demodulator_priv;
	struct cx24120_cmd cmd;

	dev_dbg(&state->i2c->dev, "\n");

	/*
	 * Yes, cmd.len is set to zero. The old driver
	 * didn't specify any len, but also had a
	 * memset 0 before every use of the cmd struct
	 * which would have set it to zero.
	 * This quite probably needs looking into.
	 */
	cmd.id = CMD_DISEQC_BURST;
	cmd.len = 0;
	cmd.arg[0] = 0x00;
	cmd.arg[1] = (burst == SEC_MINI_B) ? 0x01 : 0x00;

	return cx24120_message_send(state, &cmd);
}

static int cx24120_set_tone(struct dvb_frontend *fe, enum fe_sec_tone_mode tone)
{
	struct cx24120_state *state = fe->demodulator_priv;
	struct cx24120_cmd cmd;

	dev_dbg(&state->i2c->dev, "(%d)\n", tone);

	if ((tone != SEC_TONE_ON) && (tone != SEC_TONE_OFF)) {
		err("Invalid tone=%d\n", tone);
		return -EINVAL;
	}

	cmd.id = CMD_SETTONE;
	cmd.len = 4;
	cmd.arg[0] = 0x00;
	cmd.arg[1] = 0x00;
	cmd.arg[2] = 0x00;
	cmd.arg[3] = (tone == SEC_TONE_ON) ? 0x01 : 0x00;

	return cx24120_message_send(state, &cmd);
}

static int cx24120_set_voltage(struct dvb_frontend *fe,
			       enum fe_sec_voltage voltage)
{
	struct cx24120_state *state = fe->demodulator_priv;
	struct cx24120_cmd cmd;

	dev_dbg(&state->i2c->dev, "(%d)\n", voltage);

	cmd.id = CMD_SETVOLTAGE;
	cmd.len = 2;
	cmd.arg[0] = 0x00;
	cmd.arg[1] = (voltage == SEC_VOLTAGE_18) ? 0x01 : 0x00;

	return cx24120_message_send(state, &cmd);
}

static int cx24120_send_diseqc_msg(struct dvb_frontend *fe,
				   struct dvb_diseqc_master_cmd *d)
{
	struct cx24120_state *state = fe->demodulator_priv;
	struct cx24120_cmd cmd;
	int back_count;

	dev_dbg(&state->i2c->dev, "\n");

	cmd.id = CMD_DISEQC_MSG1;
	cmd.len = 11;
	cmd.arg[0] = 0x00;
	cmd.arg[1] = 0x00;
	cmd.arg[2] = 0x03;
	cmd.arg[3] = 0x16;
	cmd.arg[4] = 0x28;
	cmd.arg[5] = 0x01;
	cmd.arg[6] = 0x01;
	cmd.arg[7] = 0x14;
	cmd.arg[8] = 0x19;
	cmd.arg[9] = 0x14;
	cmd.arg[10] = 0x1e;

	if (cx24120_message_send(state, &cmd)) {
		err("send 1st message(0x%x) failed\n", cmd.id);
		return -EREMOTEIO;
	}

	cmd.id = CMD_DISEQC_MSG2;
	cmd.len = d->msg_len + 6;
	cmd.arg[0] = 0x00;
	cmd.arg[1] = 0x01;
	cmd.arg[2] = 0x02;
	cmd.arg[3] = 0x00;
	cmd.arg[4] = 0x00;
	cmd.arg[5] = d->msg_len;

	memcpy(&cmd.arg[6], &d->msg, d->msg_len);

	if (cx24120_message_send(state, &cmd)) {
		err("send 2nd message(0x%x) failed\n", cmd.id);
		return -EREMOTEIO;
	}

	back_count = 500;
	do {
		if (!(cx24120_readreg(state, 0x93) & 0x01)) {
			dev_dbg(&state->i2c->dev, "diseqc sequence sent\n");
			return 0;
		}
		msleep(20);
		back_count -= 20;
	} while (back_count);

	err("Too long waiting for diseqc.\n");
	return -ETIMEDOUT;
}

static void cx24120_get_stats(struct cx24120_state *state)
{
	struct dvb_frontend *fe = &state->frontend;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct cx24120_cmd cmd;
	int ret, cnr, msecs;
	u16 sig, ucb;
	u32 ber;

	dev_dbg(&state->i2c->dev, "\n");

	/* signal strength */
	if (state->fe_status & FE_HAS_SIGNAL) {
		cmd.id = CMD_READ_SNR;
		cmd.len = 1;
		cmd.arg[0] = 0x00;

		ret = cx24120_message_send(state, &cmd);
		if (ret != 0) {
			err("error reading signal strength\n");
			return;
		}

		/* raw */
		sig = cx24120_readreg(state, CX24120_REG_SIGSTR_H) >> 6;
		sig = sig << 8;
		sig |= cx24120_readreg(state, CX24120_REG_SIGSTR_L);
		dev_dbg(&state->i2c->dev,
			"signal strength from firmware = 0x%x\n", sig);

		/* cooked */
		sig = -100 * sig + 94324;

		c->strength.stat[0].scale = FE_SCALE_RELATIVE;
		c->strength.stat[0].uvalue = sig;
	} else {
		c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
	}

	/* CNR */
	if (state->fe_status & FE_HAS_VITERBI) {
		cnr = cx24120_readreg(state, CX24120_REG_QUALITY_H) << 8;
		cnr |= cx24120_readreg(state, CX24120_REG_QUALITY_L);
		dev_dbg(&state->i2c->dev, "read SNR index = %d\n", cnr);

		/* guessed - seems about right */
		cnr = cnr * 100;

		c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
		c->cnr.stat[0].svalue = cnr;
	} else {
		c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
	}

	/* BER & UCB require lock */
	if (!(state->fe_status & FE_HAS_LOCK)) {
		c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
		c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
		c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
		c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
		return;
	}

	/* BER */
	if (time_after(jiffies, state->ber_jiffies_stats)) {
		msecs = (state->berw_usecs + 500) / 1000;
		state->ber_jiffies_stats = jiffies + msecs_to_jiffies(msecs);

		ber = cx24120_readreg(state, CX24120_REG_BER_HH) << 24;
		ber |= cx24120_readreg(state, CX24120_REG_BER_HL) << 16;
		ber |= cx24120_readreg(state, CX24120_REG_BER_LH) << 8;
		ber |= cx24120_readreg(state, CX24120_REG_BER_LL);
		dev_dbg(&state->i2c->dev, "read BER index = %d\n", ber);

		c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
		c->post_bit_error.stat[0].uvalue += ber;

		c->post_bit_count.stat[0].scale = FE_SCALE_COUNTER;
		c->post_bit_count.stat[0].uvalue += CX24120_BER_WSIZE;
	}

	/* UCB */
	if (time_after(jiffies, state->per_jiffies_stats)) {
		state->per_jiffies_stats = jiffies + msecs_to_jiffies(1000);

		ucb = cx24120_readreg(state, CX24120_REG_UCB_H) << 8;
		ucb |= cx24120_readreg(state, CX24120_REG_UCB_L);
		dev_dbg(&state->i2c->dev, "ucblocks = %d\n", ucb);

		/* handle reset */
		if (ucb < state->ucb_offset)
			state->ucb_offset = c->block_error.stat[0].uvalue;

		c->block_error.stat[0].scale = FE_SCALE_COUNTER;
		c->block_error.stat[0].uvalue = ucb + state->ucb_offset;

		c->block_count.stat[0].scale = FE_SCALE_COUNTER;
		c->block_count.stat[0].uvalue += state->bitrate / 8 / 208;
	}
}

static void cx24120_set_clock_ratios(struct dvb_frontend *fe);

/* Read current tuning status */
static int cx24120_read_status(struct dvb_frontend *fe, enum fe_status *status)
{
	struct cx24120_state *state = fe->demodulator_priv;
	int lock;

	lock = cx24120_readreg(state, CX24120_REG_STATUS);

	dev_dbg(&state->i2c->dev, "status = 0x%02x\n", lock);

	*status = 0;

	if (lock & CX24120_HAS_SIGNAL)
		*status = FE_HAS_SIGNAL;
	if (lock & CX24120_HAS_CARRIER)
		*status |= FE_HAS_CARRIER;
	if (lock & CX24120_HAS_VITERBI)
		*status |= FE_HAS_VITERBI | FE_HAS_SYNC;
	if (lock & CX24120_HAS_LOCK)
		*status |= FE_HAS_LOCK;

	/*
	 * TODO: is FE_HAS_SYNC in the right place?
	 * Other cx241xx drivers have this slightly
	 * different
	 */

	state->fe_status = *status;
	cx24120_get_stats(state);

	/* Set the clock once tuned in */
	if (state->need_clock_set && *status & FE_HAS_LOCK) {
		/* Set clock ratios */
		cx24120_set_clock_ratios(fe);

		/* Old driver would do a msleep(200) here */

		/* Renable mpeg output */
		if (!state->mpeg_enabled)
			cx24120_msg_mpeg_output_global_config(state, 1);

		state->need_clock_set = 0;
	}

	return 0;
}

/*
 * FEC & modulation lookup table
 * Used for decoding the REG_FECMODE register
 * once tuned in.
 */
struct cx24120_modfec {
	enum fe_delivery_system delsys;
	enum fe_modulation mod;
	enum fe_code_rate fec;
	u8 val;
};

static const struct cx24120_modfec modfec_lookup_table[] = {
	/*delsys     mod    fec       val */
	{ SYS_DVBS,  QPSK,  FEC_1_2,  0x01 },
	{ SYS_DVBS,  QPSK,  FEC_2_3,  0x02 },
	{ SYS_DVBS,  QPSK,  FEC_3_4,  0x03 },
	{ SYS_DVBS,  QPSK,  FEC_4_5,  0x04 },
	{ SYS_DVBS,  QPSK,  FEC_5_6,  0x05 },
	{ SYS_DVBS,  QPSK,  FEC_6_7,  0x06 },
	{ SYS_DVBS,  QPSK,  FEC_7_8,  0x07 },

	{ SYS_DVBS2, QPSK,  FEC_1_2,  0x04 },
	{ SYS_DVBS2, QPSK,  FEC_3_5,  0x05 },
	{ SYS_DVBS2, QPSK,  FEC_2_3,  0x06 },
	{ SYS_DVBS2, QPSK,  FEC_3_4,  0x07 },
	{ SYS_DVBS2, QPSK,  FEC_4_5,  0x08 },
	{ SYS_DVBS2, QPSK,  FEC_5_6,  0x09 },
	{ SYS_DVBS2, QPSK,  FEC_8_9,  0x0a },
	{ SYS_DVBS2, QPSK,  FEC_9_10, 0x0b },

	{ SYS_DVBS2, PSK_8, FEC_3_5,  0x0c },
	{ SYS_DVBS2, PSK_8, FEC_2_3,  0x0d },
	{ SYS_DVBS2, PSK_8, FEC_3_4,  0x0e },
	{ SYS_DVBS2, PSK_8, FEC_5_6,  0x0f },
	{ SYS_DVBS2, PSK_8, FEC_8_9,  0x10 },
	{ SYS_DVBS2, PSK_8, FEC_9_10, 0x11 },
};

/* Retrieve current fec, modulation & pilot values */
static int cx24120_get_fec(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct cx24120_state *state = fe->demodulator_priv;
	int idx;
	int ret;
	int fec;

	ret = cx24120_readreg(state, CX24120_REG_FECMODE);
	fec = ret & 0x3f; /* Lower 6 bits */

	dev_dbg(&state->i2c->dev, "raw fec = %d\n", fec);

	for (idx = 0; idx < ARRAY_SIZE(modfec_lookup_table); idx++) {
		if (modfec_lookup_table[idx].delsys != state->dcur.delsys)
			continue;
		if (modfec_lookup_table[idx].val != fec)
			continue;

		break; /* found */
	}

	if (idx >= ARRAY_SIZE(modfec_lookup_table)) {
		dev_dbg(&state->i2c->dev, "couldn't find fec!\n");
		return -EINVAL;
	}

	/* save values back to cache */
	c->modulation = modfec_lookup_table[idx].mod;
	c->fec_inner = modfec_lookup_table[idx].fec;
	c->pilot = (ret & 0x80) ? PILOT_ON : PILOT_OFF;

	dev_dbg(&state->i2c->dev, "mod(%d), fec(%d), pilot(%d)\n",
		c->modulation, c->fec_inner, c->pilot);

	return 0;
}

/* Calculate ber window time */
static void cx24120_calculate_ber_window(struct cx24120_state *state, u32 rate)
{
	struct dvb_frontend *fe = &state->frontend;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	u64 tmp;

	/*
	 * Calculate bitrate from rate in the clock ratios table.
	 * This isn't *exactly* right but close enough.
	 */
	tmp = (u64)c->symbol_rate * rate;
	do_div(tmp, 256);
	state->bitrate = tmp;

	/* usecs per ber window */
	tmp = 1000000ULL * CX24120_BER_WSIZE;
	do_div(tmp, state->bitrate);
	state->berw_usecs = tmp;

	dev_dbg(&state->i2c->dev, "bitrate: %u, berw_usecs: %u\n",
		state->bitrate, state->berw_usecs);
}

/*
 * Clock ratios lookup table
 *
 * Values obtained from much larger table in old driver
 * which had numerous entries which would never match.
 *
 * There's probably some way of calculating these but I
 * can't determine the pattern
 */
struct cx24120_clock_ratios_table {
	enum fe_delivery_system delsys;
	enum fe_pilot pilot;
	enum fe_modulation mod;
	enum fe_code_rate fec;
	u32 m_rat;
	u32 n_rat;
	u32 rate;
};

static const struct cx24120_clock_ratios_table clock_ratios_table[] = {
	/*delsys     pilot      mod    fec       m_rat    n_rat   rate */
	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_1_2,  273088,  254505, 274 },
	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_3_5,  17272,   13395,  330 },
	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_2_3,  24344,   16967,  367 },
	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_3_4,  410788,  254505, 413 },
	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_4_5,  438328,  254505, 440 },
	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_5_6,  30464,   16967,  459 },
	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_8_9,  487832,  254505, 490 },
	{ SYS_DVBS2, PILOT_OFF, QPSK,  FEC_9_10, 493952,  254505, 496 },
	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_3_5,  328168,  169905, 494 },
	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_2_3,  24344,   11327,  550 },
	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_3_4,  410788,  169905, 618 },
	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_5_6,  30464,   11327,  688 },
	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_8_9,  487832,  169905, 735 },
	{ SYS_DVBS2, PILOT_OFF, PSK_8, FEC_9_10, 493952,  169905, 744 },
	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_1_2,  273088,  260709, 268 },
	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_3_5,  328168,  260709, 322 },
	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_2_3,  121720,  86903,  358 },
	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_3_4,  410788,  260709, 403 },
	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_4_5,  438328,  260709, 430 },
	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_5_6,  152320,  86903,  448 },
	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_8_9,  487832,  260709, 479 },
	{ SYS_DVBS2, PILOT_ON,  QPSK,  FEC_9_10, 493952,  260709, 485 },
	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_3_5,  328168,  173853, 483 },
	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_2_3,  121720,  57951,  537 },
	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_3_4,  410788,  173853, 604 },
	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_5_6,  152320,  57951,  672 },
	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_8_9,  487832,  173853, 718 },
	{ SYS_DVBS2, PILOT_ON,  PSK_8, FEC_9_10, 493952,  173853, 727 },
	{ SYS_DVBS,  PILOT_OFF, QPSK,  FEC_1_2,  152592,  152592, 256 },
	{ SYS_DVBS,  PILOT_OFF, QPSK,  FEC_2_3,  305184,  228888, 341 },
	{ SYS_DVBS,  PILOT_OFF, QPSK,  FEC_3_4,  457776,  305184, 384 },
	{ SYS_DVBS,  PILOT_OFF, QPSK,  FEC_5_6,  762960,  457776, 427 },
	{ SYS_DVBS,  PILOT_OFF, QPSK,  FEC_7_8,  1068144, 610368, 448 },
};

/* Set clock ratio from lookup table */
static void cx24120_set_clock_ratios(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct cx24120_state *state = fe->demodulator_priv;
	struct cx24120_cmd cmd;
	int ret, idx;

	/* Find fec, modulation, pilot */
	ret = cx24120_get_fec(fe);
	if (ret != 0)
		return;

	/* Find the clock ratios in the lookup table */
	for (idx = 0; idx < ARRAY_SIZE(clock_ratios_table); idx++) {
		if (clock_ratios_table[idx].delsys != state->dcur.delsys)
			continue;
		if (clock_ratios_table[idx].mod != c->modulation)
			continue;
		if (clock_ratios_table[idx].fec != c->fec_inner)
			continue;
		if (clock_ratios_table[idx].pilot != c->pilot)
			continue;

		break;		/* found */
	}

	if (idx >= ARRAY_SIZE(clock_ratios_table)) {
		info("Clock ratio not found - data reception in danger\n");
		return;
	}

	/* Read current values? */
	cmd.id = CMD_CLOCK_READ;
	cmd.len = 1;
	cmd.arg[0] = 0x00;
	ret = cx24120_message_sendrcv(state, &cmd, 6);
	if (ret != 0)
		return;
	/* in cmd[0]-[5] - result */

	dev_dbg(&state->i2c->dev, "m=%d, n=%d; idx: %d m=%d, n=%d, rate=%d\n",
		cmd.arg[2] | (cmd.arg[1] << 8) | (cmd.arg[0] << 16),
		cmd.arg[5] | (cmd.arg[4] << 8) | (cmd.arg[3] << 16),
		idx,
		clock_ratios_table[idx].m_rat,
		clock_ratios_table[idx].n_rat,
		clock_ratios_table[idx].rate);

	/* Set the clock */
	cmd.id = CMD_CLOCK_SET;
	cmd.len = 10;
	cmd.arg[0] = 0;
	cmd.arg[1] = 0x10;
	cmd.arg[2] = (clock_ratios_table[idx].m_rat >> 16) & 0xff;
	cmd.arg[3] = (clock_ratios_table[idx].m_rat >>  8) & 0xff;
	cmd.arg[4] = (clock_ratios_table[idx].m_rat >>  0) & 0xff;
	cmd.arg[5] = (clock_ratios_table[idx].n_rat >> 16) & 0xff;
	cmd.arg[6] = (clock_ratios_table[idx].n_rat >>  8) & 0xff;
	cmd.arg[7] = (clock_ratios_table[idx].n_rat >>  0) & 0xff;
	cmd.arg[8] = (clock_ratios_table[idx].rate >> 8) & 0xff;
	cmd.arg[9] = (clock_ratios_table[idx].rate >> 0) & 0xff;

	cx24120_message_send(state, &cmd);

	/* Calculate ber window rates for stat work */
	cx24120_calculate_ber_window(state, clock_ratios_table[idx].rate);
}

/* Set inversion value */
static int cx24120_set_inversion(struct cx24120_state *state,
				 enum fe_spectral_inversion inversion)
{
	dev_dbg(&state->i2c->dev, "(%d)\n", inversion);

	switch (inversion) {
	case INVERSION_OFF:
		state->dnxt.inversion_val = 0x00;
		break;
	case INVERSION_ON:
		state->dnxt.inversion_val = 0x04;
		break;
	case INVERSION_AUTO:
		state->dnxt.inversion_val = 0x0c;
		break;
	default:
		return -EINVAL;
	}

	state->dnxt.inversion = inversion;

	return 0;
}

/* FEC lookup table for tuning */
struct cx24120_modfec_table {
	enum fe_delivery_system delsys;
	enum fe_modulation mod;
	enum fe_code_rate fec;
	u8 val;
};

static const struct cx24120_modfec_table modfec_table[] = {
	/*delsys     mod    fec       val */
	{ SYS_DVBS,  QPSK,  FEC_1_2,  0x2e },
	{ SYS_DVBS,  QPSK,  FEC_2_3,  0x2f },
	{ SYS_DVBS,  QPSK,  FEC_3_4,  0x30 },
	{ SYS_DVBS,  QPSK,  FEC_5_6,  0x31 },
	{ SYS_DVBS,  QPSK,  FEC_6_7,  0x32 },
	{ SYS_DVBS,  QPSK,  FEC_7_8,  0x33 },

	{ SYS_DVBS2, QPSK,  FEC_1_2,  0x04 },
	{ SYS_DVBS2, QPSK,  FEC_3_5,  0x05 },
	{ SYS_DVBS2, QPSK,  FEC_2_3,  0x06 },
	{ SYS_DVBS2, QPSK,  FEC_3_4,  0x07 },
	{ SYS_DVBS2, QPSK,  FEC_4_5,  0x08 },
	{ SYS_DVBS2, QPSK,  FEC_5_6,  0x09 },
	{ SYS_DVBS2, QPSK,  FEC_8_9,  0x0a },
	{ SYS_DVBS2, QPSK,  FEC_9_10, 0x0b },

	{ SYS_DVBS2, PSK_8, FEC_3_5,  0x0c },
	{ SYS_DVBS2, PSK_8, FEC_2_3,  0x0d },
	{ SYS_DVBS2, PSK_8, FEC_3_4,  0x0e },
	{ SYS_DVBS2, PSK_8, FEC_5_6,  0x0f },
	{ SYS_DVBS2, PSK_8, FEC_8_9,  0x10 },
	{ SYS_DVBS2, PSK_8, FEC_9_10, 0x11 },
};

/* Set fec_val & fec_mask values from delsys, modulation & fec */
static int cx24120_set_fec(struct cx24120_state *state, enum fe_modulation mod,
			   enum fe_code_rate fec)
{
	int idx;

	dev_dbg(&state->i2c->dev, "(0x%02x,0x%02x)\n", mod, fec);

	state->dnxt.fec = fec;

	/* Lookup fec_val from modfec table */
	for (idx = 0; idx < ARRAY_SIZE(modfec_table); idx++) {
		if (modfec_table[idx].delsys != state->dnxt.delsys)
			continue;
		if (modfec_table[idx].mod != mod)
			continue;
		if (modfec_table[idx].fec != fec)
			continue;

		/* found */
		state->dnxt.fec_mask = 0x00;
		state->dnxt.fec_val = modfec_table[idx].val;
		return 0;
	}

	if (state->dnxt.delsys == SYS_DVBS2) {
		/* DVBS2 auto is 0x00/0x00 */
		state->dnxt.fec_mask = 0x00;
		state->dnxt.fec_val  = 0x00;
	} else {
		/* Set DVB-S to auto */
		state->dnxt.fec_val  = 0x2e;
		state->dnxt.fec_mask = 0xac;
	}

	return 0;
}

/* Set pilot */
static int cx24120_set_pilot(struct cx24120_state *state, enum fe_pilot pilot)
{
	dev_dbg(&state->i2c->dev, "(%d)\n", pilot);

	/* Pilot only valid in DVBS2 */
	if (state->dnxt.delsys != SYS_DVBS2) {
		state->dnxt.pilot_val = CX24120_PILOT_OFF;
		return 0;
	}

	switch (pilot) {
	case PILOT_OFF:
		state->dnxt.pilot_val = CX24120_PILOT_OFF;
		break;
	case PILOT_ON:
		state->dnxt.pilot_val = CX24120_PILOT_ON;
		break;
	case PILOT_AUTO:
	default:
		state->dnxt.pilot_val = CX24120_PILOT_AUTO;
	}

	return 0;
}

/* Set symbol rate */
static int cx24120_set_symbolrate(struct cx24120_state *state, u32 rate)
{
	dev_dbg(&state->i2c->dev, "(%d)\n", rate);

	state->dnxt.symbol_rate = rate;

	/* Check symbol rate */
	if (rate  > 31000000) {
		state->dnxt.clkdiv  = (-(rate < 31000001) & 3) + 2;
		state->dnxt.ratediv = (-(rate < 31000001) & 6) + 4;
	} else {
		state->dnxt.clkdiv  = 3;
		state->dnxt.ratediv = 6;
	}

	return 0;
}

/* Overwrite the current tuning params, we are about to tune */
static void cx24120_clone_params(struct dvb_frontend *fe)
{
	struct cx24120_state *state = fe->demodulator_priv;

	state->dcur = state->dnxt;
}

static int cx24120_set_frontend(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct cx24120_state *state = fe->demodulator_priv;
	struct cx24120_cmd cmd;
	int ret;

	switch (c->delivery_system) {
	case SYS_DVBS2:
		dev_dbg(&state->i2c->dev, "DVB-S2\n");
		break;
	case SYS_DVBS:
		dev_dbg(&state->i2c->dev, "DVB-S\n");
		break;
	default:
		dev_dbg(&state->i2c->dev,
			"delivery system(%d) not supported\n",
			c->delivery_system);
		ret = -EINVAL;
		break;
	}

	state->dnxt.delsys = c->delivery_system;
	state->dnxt.modulation = c->modulation;
	state->dnxt.frequency = c->frequency;
	state->dnxt.pilot = c->pilot;

	ret = cx24120_set_inversion(state, c->inversion);
	if (ret !=  0)
		return ret;

	ret = cx24120_set_fec(state, c->modulation, c->fec_inner);
	if (ret !=  0)
		return ret;

	ret = cx24120_set_pilot(state, c->pilot);
	if (ret != 0)
		return ret;

	ret = cx24120_set_symbolrate(state, c->symbol_rate);
	if (ret !=  0)
		return ret;

	/* discard the 'current' tuning parameters and prepare to tune */
	cx24120_clone_params(fe);

	dev_dbg(&state->i2c->dev,
		"delsys      = %d\n", state->dcur.delsys);
	dev_dbg(&state->i2c->dev,
		"modulation  = %d\n", state->dcur.modulation);
	dev_dbg(&state->i2c->dev,
		"frequency   = %d\n", state->dcur.frequency);
	dev_dbg(&state->i2c->dev,
		"pilot       = %d (val = 0x%02x)\n",
		state->dcur.pilot, state->dcur.pilot_val);
	dev_dbg(&state->i2c->dev,
		"symbol_rate = %d (clkdiv/ratediv = 0x%02x/0x%02x)\n",
		 state->dcur.symbol_rate,
		 state->dcur.clkdiv, state->dcur.ratediv);
	dev_dbg(&state->i2c->dev,
		"FEC         = %d (mask/val = 0x%02x/0x%02x)\n",
		state->dcur.fec, state->dcur.fec_mask, state->dcur.fec_val);
	dev_dbg(&state->i2c->dev,
		"Inversion   = %d (val = 0x%02x)\n",
		state->dcur.inversion, state->dcur.inversion_val);

	/* Flag that clock needs to be set after tune */
	state->need_clock_set = 1;

	/* Tune in */
	cmd.id = CMD_TUNEREQUEST;
	cmd.len = 15;
	cmd.arg[0] = 0;
	cmd.arg[1]  = (state->dcur.frequency & 0xff0000) >> 16;
	cmd.arg[2]  = (state->dcur.frequency & 0x00ff00) >> 8;
	cmd.arg[3]  = (state->dcur.frequency & 0x0000ff);
	cmd.arg[4]  = ((state->dcur.symbol_rate / 1000) & 0xff00) >> 8;
	cmd.arg[5]  = ((state->dcur.symbol_rate / 1000) & 0x00ff);
	cmd.arg[6]  = state->dcur.inversion;
	cmd.arg[7]  = state->dcur.fec_val | state->dcur.pilot_val;
	cmd.arg[8]  = CX24120_SEARCH_RANGE_KHZ >> 8;
	cmd.arg[9]  = CX24120_SEARCH_RANGE_KHZ & 0xff;
	cmd.arg[10] = 0;		/* maybe rolloff? */
	cmd.arg[11] = state->dcur.fec_mask;
	cmd.arg[12] = state->dcur.ratediv;
	cmd.arg[13] = state->dcur.clkdiv;
	cmd.arg[14] = 0;

	/* Send tune command */
	ret = cx24120_message_send(state, &cmd);
	if (ret != 0)
		return ret;

	/* Write symbol rate values */
	ret = cx24120_writereg(state, CX24120_REG_CLKDIV, state->dcur.clkdiv);
	ret = cx24120_readreg(state, CX24120_REG_RATEDIV);
	ret &= 0xfffffff0;
	ret |= state->dcur.ratediv;
	ret = cx24120_writereg(state, CX24120_REG_RATEDIV, ret);

	return 0;
}

/* Set vco from config */
static int cx24120_set_vco(struct cx24120_state *state)
{
	struct cx24120_cmd cmd;
	u32 nxtal_khz, vco;
	u64 inv_vco;
	u32 xtal_khz = state->config->xtal_khz;

	nxtal_khz = xtal_khz * 4;
	vco = nxtal_khz * 10;
	inv_vco = DIV_ROUND_CLOSEST_ULL(0x400000000ULL, vco);

	dev_dbg(&state->i2c->dev, "xtal=%d, vco=%d, inv_vco=%lld\n",
		xtal_khz, vco, inv_vco);

	cmd.id = CMD_VCO_SET;
	cmd.len = 12;
	cmd.arg[0] = (vco >> 16) & 0xff;
	cmd.arg[1] = (vco >> 8) & 0xff;
	cmd.arg[2] = vco & 0xff;
	cmd.arg[3] = (inv_vco >> 8) & 0xff;
	cmd.arg[4] = (inv_vco) & 0xff;
	cmd.arg[5] = 0x03;
	cmd.arg[6] = (nxtal_khz >> 8) & 0xff;
	cmd.arg[7] = nxtal_khz & 0xff;
	cmd.arg[8] = 0x06;
	cmd.arg[9] = 0x03;
	cmd.arg[10] = (xtal_khz >> 16) & 0xff;
	cmd.arg[11] = xtal_khz & 0xff;

	return cx24120_message_send(state, &cmd);
}

static int cx24120_init(struct dvb_frontend *fe)
{
	const struct firmware *fw;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct cx24120_state *state = fe->demodulator_priv;
	struct cx24120_cmd cmd;
	u8 reg;
	int ret, i;
	unsigned char vers[4];

	if (state->cold_init)
		return 0;

	/* ???? */
	cx24120_writereg(state, 0xea, 0x00);
	cx24120_test_rom(state);
	reg = cx24120_readreg(state, 0xfb) & 0xfe;
	cx24120_writereg(state, 0xfb, reg);
	reg = cx24120_readreg(state, 0xfc) & 0xfe;
	cx24120_writereg(state, 0xfc, reg);
	cx24120_writereg(state, 0xc3, 0x04);
	cx24120_writereg(state, 0xc4, 0x04);
	cx24120_writereg(state, 0xce, 0x00);
	cx24120_writereg(state, 0xcf, 0x00);
	reg = cx24120_readreg(state, 0xea) & 0xfe;
	cx24120_writereg(state, 0xea, reg);
	cx24120_writereg(state, 0xeb, 0x0c);
	cx24120_writereg(state, 0xec, 0x06);
	cx24120_writereg(state, 0xed, 0x05);
	cx24120_writereg(state, 0xee, 0x03);
	cx24120_writereg(state, 0xef, 0x05);
	cx24120_writereg(state, 0xf3, 0x03);
	cx24120_writereg(state, 0xf4, 0x44);

	for (i = 0; i < 3; i++) {
		cx24120_writereg(state, 0xf0 + i, 0x04);
		cx24120_writereg(state, 0xe6 + i, 0x02);
	}

	cx24120_writereg(state, 0xea, (reg | 0x01));
	for (i = 0; i < 6; i += 2) {
		cx24120_writereg(state, 0xc5 + i, 0x00);
		cx24120_writereg(state, 0xc6 + i, 0x00);
	}

	cx24120_writereg(state, 0xe4, 0x03);
	cx24120_writereg(state, 0xeb, 0x0a);

	dev_dbg(&state->i2c->dev, "requesting firmware (%s) to download...\n",
		CX24120_FIRMWARE);

	ret = state->config->request_firmware(fe, &fw, CX24120_FIRMWARE);
	if (ret) {
		err("Could not load firmware (%s): %d\n", CX24120_FIRMWARE,
		    ret);
		return ret;
	}

	dev_dbg(&state->i2c->dev,
		"Firmware found, size %d bytes (%02x %02x .. %02x %02x)\n",
		(int)fw->size,			/* firmware_size in bytes */
		fw->data[0],			/* fw 1st byte */
		fw->data[1],			/* fw 2d byte */
		fw->data[fw->size - 2],		/* fw before last byte */
		fw->data[fw->size - 1]);	/* fw last byte */

	cx24120_test_rom(state);
	reg = cx24120_readreg(state, 0xfb) & 0xfe;
	cx24120_writereg(state, 0xfb, reg);
	cx24120_writereg(state, 0xe0, 0x76);
	cx24120_writereg(state, 0xf7, 0x81);
	cx24120_writereg(state, 0xf8, 0x00);
	cx24120_writereg(state, 0xf9, 0x00);
	cx24120_writeregs(state, 0xfa, fw->data, (fw->size - 1), 0x00);
	cx24120_writereg(state, 0xf7, 0xc0);
	cx24120_writereg(state, 0xe0, 0x00);
	reg = (fw->size - 2) & 0x00ff;
	cx24120_writereg(state, 0xf8, reg);
	reg = ((fw->size - 2) >> 8) & 0x00ff;
	cx24120_writereg(state, 0xf9, reg);
	cx24120_writereg(state, 0xf7, 0x00);
	cx24120_writereg(state, 0xdc, 0x00);
	cx24120_writereg(state, 0xdc, 0x07);
	msleep(500);

	/* Check final byte matches final byte of firmware */
	reg = cx24120_readreg(state, 0xe1);
	if (reg == fw->data[fw->size - 1]) {
		dev_dbg(&state->i2c->dev, "Firmware uploaded successfully\n");
		ret = 0;
	} else {
		err("Firmware upload failed. Last byte returned=0x%x\n", ret);
		ret = -EREMOTEIO;
	}
	cx24120_writereg(state, 0xdc, 0x00);
	release_firmware(fw);
	if (ret != 0)
		return ret;

	/* Start tuner */
	cmd.id = CMD_START_TUNER;
	cmd.len = 3;
	cmd.arg[0] = 0x00;
	cmd.arg[1] = 0x00;
	cmd.arg[2] = 0x00;

	if (cx24120_message_send(state, &cmd) != 0) {
		err("Error tuner start! :(\n");
		return -EREMOTEIO;
	}

	/* Set VCO */
	ret = cx24120_set_vco(state);
	if (ret != 0) {
		err("Error set VCO! :(\n");
		return ret;
	}

	/* set bandwidth */
	cmd.id = CMD_BANDWIDTH;
	cmd.len = 12;
	cmd.arg[0] = 0x00;
	cmd.arg[1] = 0x00;
	cmd.arg[2] = 0x00;
	cmd.arg[3] = 0x00;
	cmd.arg[4] = 0x05;
	cmd.arg[5] = 0x02;
	cmd.arg[6] = 0x02;
	cmd.arg[7] = 0x00;
	cmd.arg[8] = 0x05;
	cmd.arg[9] = 0x02;
	cmd.arg[10] = 0x02;
	cmd.arg[11] = 0x00;

	if (cx24120_message_send(state, &cmd)) {
		err("Error set bandwidth!\n");
		return -EREMOTEIO;
	}

	reg = cx24120_readreg(state, 0xba);
	if (reg > 3) {
		dev_dbg(&state->i2c->dev, "Reset-readreg 0xba: %x\n", ret);
		err("Error initialising tuner!\n");
		return -EREMOTEIO;
	}

	dev_dbg(&state->i2c->dev, "Tuner initialised correctly.\n");

	/* Initialise mpeg outputs */
	cx24120_writereg(state, 0xeb, 0x0a);
	if (cx24120_msg_mpeg_output_global_config(state, 0) ||
	    cx24120_msg_mpeg_output_config(state, 0) ||
	    cx24120_msg_mpeg_output_config(state, 1) ||
	    cx24120_msg_mpeg_output_config(state, 2)) {
		err("Error initialising mpeg output. :(\n");
		return -EREMOTEIO;
	}

	/* Set size of BER window */
	cmd.id = CMD_BER_CTRL;
	cmd.len = 3;
	cmd.arg[0] = 0x00;
	cmd.arg[1] = CX24120_BER_WINDOW;
	cmd.arg[2] = CX24120_BER_WINDOW;
	if (cx24120_message_send(state, &cmd)) {
		err("Error setting ber window\n");
		return -EREMOTEIO;
	}

	/* Firmware CMD 35: Get firmware version */
	cmd.id = CMD_FWVERSION;
	cmd.len = 1;
	for (i = 0; i < 4; i++) {
		cmd.arg[0] = i;
		ret = cx24120_message_send(state, &cmd);
		if (ret != 0)
			return ret;
		vers[i] = cx24120_readreg(state, CX24120_REG_MAILBOX);
	}
	info("FW version %i.%i.%i.%i\n", vers[0], vers[1], vers[2], vers[3]);

	/* init stats here in order signal app which stats are supported */
	c->strength.len = 1;
	c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
	c->cnr.len = 1;
	c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
	c->post_bit_error.len = 1;
	c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
	c->post_bit_count.len = 1;
	c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
	c->block_error.len = 1;
	c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
	c->block_count.len = 1;
	c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;

	state->cold_init = 1;

	return 0;
}

static int cx24120_tune(struct dvb_frontend *fe, bool re_tune,
			unsigned int mode_flags, unsigned int *delay,
			enum fe_status *status)
{
	struct cx24120_state *state = fe->demodulator_priv;
	int ret;

	dev_dbg(&state->i2c->dev, "(%d)\n", re_tune);

	/* TODO: Do we need to set delay? */

	if (re_tune) {
		ret = cx24120_set_frontend(fe);
		if (ret)
			return ret;
	}

	return cx24120_read_status(fe, status);
}

static int cx24120_get_algo(struct dvb_frontend *fe)
{
	return DVBFE_ALGO_HW;
}

static int cx24120_sleep(struct dvb_frontend *fe)
{
	return 0;
}

static int cx24120_get_frontend(struct dvb_frontend *fe,
				struct dtv_frontend_properties *c)
{
	struct cx24120_state *state = fe->demodulator_priv;
	u8 freq1, freq2, freq3;
	int status;

	dev_dbg(&state->i2c->dev, "\n");

	/* don't return empty data if we're not tuned in */
	status = cx24120_readreg(state, CX24120_REG_STATUS);
	if (!(status & CX24120_HAS_LOCK))
		return 0;

	/* Get frequency */
	freq1 = cx24120_readreg(state, CX24120_REG_FREQ1);
	freq2 = cx24120_readreg(state, CX24120_REG_FREQ2);
	freq3 = cx24120_readreg(state, CX24120_REG_FREQ3);
	c->frequency = (freq3 << 16) | (freq2 << 8) | freq1;
	dev_dbg(&state->i2c->dev, "frequency = %d\n", c->frequency);

	/* Get modulation, fec, pilot */
	cx24120_get_fec(fe);

	return 0;
}

static void cx24120_release(struct dvb_frontend *fe)
{
	struct cx24120_state *state = fe->demodulator_priv;

	dev_dbg(&state->i2c->dev, "Clear state structure\n");
	kfree(state);
}

static int cx24120_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
	struct cx24120_state *state = fe->demodulator_priv;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	if (c->block_error.stat[0].scale != FE_SCALE_COUNTER) {
		*ucblocks = 0;
		return 0;
	}

	*ucblocks = c->block_error.stat[0].uvalue - state->ucb_offset;

	return 0;
}

static struct dvb_frontend_ops cx24120_ops = {
	.delsys = { SYS_DVBS, SYS_DVBS2 },
	.info = {
		.name = "Conexant CX24120/CX24118",
		.frequency_min = 950000,
		.frequency_max = 2150000,
		.frequency_stepsize = 1011, /* kHz for QPSK frontends */
		.frequency_tolerance = 5000,
		.symbol_rate_min = 1000000,
		.symbol_rate_max = 45000000,
		.caps =	FE_CAN_INVERSION_AUTO |
			FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
			FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
			FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
			FE_CAN_2G_MODULATION |
			FE_CAN_QPSK | FE_CAN_RECOVER
	},
	.release =			cx24120_release,

	.init =				cx24120_init,
	.sleep =			cx24120_sleep,

	.tune =				cx24120_tune,
	.get_frontend_algo =		cx24120_get_algo,
	.set_frontend =			cx24120_set_frontend,

	.get_frontend =			cx24120_get_frontend,
	.read_status =			cx24120_read_status,
	.read_ber =			cx24120_read_ber,
	.read_signal_strength =		cx24120_read_signal_strength,
	.read_snr =			cx24120_read_snr,
	.read_ucblocks =		cx24120_read_ucblocks,

	.diseqc_send_master_cmd =	cx24120_send_diseqc_msg,

	.diseqc_send_burst =		cx24120_diseqc_send_burst,
	.set_tone =			cx24120_set_tone,
	.set_voltage =			cx24120_set_voltage,
};

MODULE_DESCRIPTION("DVB Frontend module for Conexant CX24120/CX24118 hardware");
MODULE_AUTHOR("Jemma Denson");
MODULE_LICENSE("GPL");