summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb-frontends/it913x-fe.c
blob: 708cbf197913669d84eafe50e0f18fcee2f6ef4e (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
/*
 *  Driver for it913x-fe Frontend
 *
 *  with support for on chip it9137 integral tuner
 *
 *  Copyright (C) 2011 Malcolm Priestley (tvboxspy@gmail.com)
 *  IT9137 Copyright (C) ITE Tech Inc.
 *
 *  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/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>

#include "dvb_frontend.h"
#include "it913x-fe.h"
#include "it913x-fe-priv.h"

static int it913x_debug;

module_param_named(debug, it913x_debug, int, 0644);
MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");

#define dprintk(level, args...) do { \
	if (level & it913x_debug) \
		printk(KERN_DEBUG "it913x-fe: " args); \
} while (0)

#define deb_info(args...)  dprintk(0x01, args)
#define debug_data_snipet(level, name, p) \
	  dprintk(level, name" (%02x%02x%02x%02x%02x%02x%02x%02x)", \
		*p, *(p+1), *(p+2), *(p+3), *(p+4), \
			*(p+5), *(p+6), *(p+7));
#define info(format, arg...) \
	printk(KERN_INFO "it913x-fe: " format "\n" , ## arg)

struct it913x_fe_state {
	struct dvb_frontend frontend;
	struct i2c_adapter *i2c_adap;
	struct ite_config *config;
	u8 i2c_addr;
	u32 frequency;
	fe_modulation_t constellation;
	fe_transmit_mode_t transmission_mode;
	u8 priority;
	u32 crystalFrequency;
	u32 adcFrequency;
	u8 tuner_type;
	struct adctable *table;
	fe_status_t it913x_status;
	u16 tun_xtal;
	u8 tun_fdiv;
	u8 tun_clk_mode;
	u32 tun_fn_min;
	u32 ucblocks;
};

static int it913x_read_reg(struct it913x_fe_state *state,
		u32 reg, u8 *data, u8 count)
{
	int ret;
	u8 pro = PRO_DMOD; /* All reads from demodulator */
	u8 b[4];
	struct i2c_msg msg[2] = {
		{ .addr = state->i2c_addr + (pro << 1), .flags = 0,
			.buf = b, .len = sizeof(b) },
		{ .addr = state->i2c_addr + (pro << 1), .flags = I2C_M_RD,
			.buf = data, .len = count }
	};
	b[0] = (u8) reg >> 24;
	b[1] = (u8)(reg >> 16) & 0xff;
	b[2] = (u8)(reg >> 8) & 0xff;
	b[3] = (u8) reg & 0xff;

	ret = i2c_transfer(state->i2c_adap, msg, 2);

	return ret;
}

static int it913x_read_reg_u8(struct it913x_fe_state *state, u32 reg)
{
	int ret;
	u8 b[1];
	ret = it913x_read_reg(state, reg, &b[0], sizeof(b));
	return (ret < 0) ? -ENODEV : b[0];
}

static int it913x_write(struct it913x_fe_state *state,
		u8 pro, u32 reg, u8 buf[], u8 count)
{
	u8 b[256];
	struct i2c_msg msg[1] = {
		{ .addr = state->i2c_addr + (pro << 1), .flags = 0,
		  .buf = b, .len = count + 4 }
	};
	int ret;

	b[0] = (u8) reg >> 24;
	b[1] = (u8)(reg >> 16) & 0xff;
	b[2] = (u8)(reg >> 8) & 0xff;
	b[3] = (u8) reg & 0xff;
	memcpy(&b[4], buf, count);

	ret = i2c_transfer(state->i2c_adap, msg, 1);

	if (ret < 0)
		return -EIO;

	return 0;
}

static int it913x_write_reg(struct it913x_fe_state *state,
		u8 pro, u32 reg, u32 data)
{
	int ret;
	u8 b[4];
	u8 s;

	b[0] = data >> 24;
	b[1] = (data >> 16) & 0xff;
	b[2] = (data >> 8) & 0xff;
	b[3] = data & 0xff;
	/* expand write as needed */
	if (data < 0x100)
		s = 3;
	else if (data < 0x1000)
		s = 2;
	else if (data < 0x100000)
		s = 1;
	else
		s = 0;

	ret = it913x_write(state, pro, reg, &b[s], sizeof(b) - s);

	return ret;
}

static int it913x_fe_script_loader(struct it913x_fe_state *state,
		struct it913xset *loadscript)
{
	int ret, i;
	if (loadscript == NULL)
		return -EINVAL;

	for (i = 0; i < 1000; ++i) {
		if (loadscript[i].pro == 0xff)
			break;
		ret = it913x_write(state, loadscript[i].pro,
			loadscript[i].address,
			loadscript[i].reg, loadscript[i].count);
		if (ret < 0)
			return -ENODEV;
	}
	return 0;
}

static int it913x_init_tuner(struct it913x_fe_state *state)
{
	int ret, i, reg;
	u8 val, nv_val;
	u8 nv[] = {48, 32, 24, 16, 12, 8, 6, 4, 2};
	u8 b[2];

	reg = it913x_read_reg_u8(state, 0xec86);
	switch (reg) {
	case 0:
		state->tun_clk_mode = reg;
		state->tun_xtal = 2000;
		state->tun_fdiv = 3;
		val = 16;
		break;
	case -ENODEV:
		return -ENODEV;
	case 1:
	default:
		state->tun_clk_mode = reg;
		state->tun_xtal = 640;
		state->tun_fdiv = 1;
		val = 6;
		break;
	}

	reg = it913x_read_reg_u8(state, 0xed03);

	if (reg < 0)
		return -ENODEV;
	else if (reg < sizeof(nv))
		nv_val = nv[reg];
	else
		nv_val = 2;

	for (i = 0; i < 50; i++) {
		ret = it913x_read_reg(state, 0xed23, &b[0], sizeof(b));
		reg = (b[1] << 8) + b[0];
		if (reg > 0)
			break;
		if (ret < 0)
			return -ENODEV;
		udelay(2000);
	}
	state->tun_fn_min = state->tun_xtal * reg;
	state->tun_fn_min /= (state->tun_fdiv * nv_val);
	deb_info("Tuner fn_min %d", state->tun_fn_min);

	if (state->config->chip_ver > 1)
		msleep(50);
	else {
		for (i = 0; i < 50; i++) {
			reg = it913x_read_reg_u8(state, 0xec82);
			if (reg > 0)
				break;
			if (reg < 0)
				return -ENODEV;
			udelay(2000);
		}
	}

	return it913x_write_reg(state, PRO_DMOD, 0xed81, val);
}

static int it9137_set_tuner(struct it913x_fe_state *state,
		u32 bandwidth, u32 frequency_m)
{
	struct it913xset *set_tuner = set_it9137_template;
	int ret, reg;
	u32 frequency = frequency_m / 1000;
	u32 freq, temp_f, tmp;
	u16 iqik_m_cal;
	u16 n_div;
	u8 n;
	u8 l_band;
	u8 lna_band;
	u8 bw;

	if (state->config->firmware_ver == 1)
		set_tuner = set_it9135_template;
	else
		set_tuner = set_it9137_template;

	deb_info("Tuner Frequency %d Bandwidth %d", frequency, bandwidth);

	if (frequency >= 51000 && frequency <= 440000) {
		l_band = 0;
		lna_band = 0;
	} else if (frequency > 440000 && frequency <= 484000) {
		l_band = 1;
		lna_band = 1;
	} else if (frequency > 484000 && frequency <= 533000) {
		l_band = 1;
		lna_band = 2;
	} else if (frequency > 533000 && frequency <= 587000) {
		l_band = 1;
		lna_band = 3;
	} else if (frequency > 587000 && frequency <= 645000) {
		l_band = 1;
		lna_band = 4;
	} else if (frequency > 645000 && frequency <= 710000) {
		l_band = 1;
		lna_band = 5;
	} else if (frequency > 710000 && frequency <= 782000) {
		l_band = 1;
		lna_band = 6;
	} else if (frequency > 782000 && frequency <= 860000) {
		l_band = 1;
		lna_band = 7;
	} else if (frequency > 1450000 && frequency <= 1492000) {
		l_band = 1;
		lna_band = 0;
	} else if (frequency > 1660000 && frequency <= 1685000) {
		l_band = 1;
		lna_band = 1;
	} else
		return -EINVAL;
	set_tuner[0].reg[0] = lna_band;

	switch (bandwidth) {
	case 5000000:
		bw = 0;
		break;
	case 6000000:
		bw = 2;
		break;
	case 7000000:
		bw = 4;
		break;
	default:
	case 8000000:
		bw = 6;
		break;
	}

	set_tuner[1].reg[0] = bw;
	set_tuner[2].reg[0] = 0xa0 | (l_band << 3);

	if (frequency > 53000 && frequency <= 74000) {
		n_div = 48;
		n = 0;
	} else if (frequency > 74000 && frequency <= 111000) {
		n_div = 32;
		n = 1;
	} else if (frequency > 111000 && frequency <= 148000) {
		n_div = 24;
		n = 2;
	} else if (frequency > 148000 && frequency <= 222000) {
		n_div = 16;
		n = 3;
	} else if (frequency > 222000 && frequency <= 296000) {
		n_div = 12;
		n = 4;
	} else if (frequency > 296000 && frequency <= 445000) {
		n_div = 8;
		n = 5;
	} else if (frequency > 445000 && frequency <= state->tun_fn_min) {
		n_div = 6;
		n = 6;
	} else if (frequency > state->tun_fn_min && frequency <= 950000) {
		n_div = 4;
		n = 7;
	} else if (frequency > 1450000 && frequency <= 1680000) {
		n_div = 2;
		n = 0;
	} else
		return -EINVAL;

	reg = it913x_read_reg_u8(state, 0xed81);
	iqik_m_cal = (u16)reg * n_div;

	if (reg < 0x20) {
		if (state->tun_clk_mode == 0)
			iqik_m_cal = (iqik_m_cal * 9) >> 5;
		else
			iqik_m_cal >>= 1;
	} else {
		iqik_m_cal = 0x40 - iqik_m_cal;
		if (state->tun_clk_mode == 0)
			iqik_m_cal = ~((iqik_m_cal * 9) >> 5);
		else
			iqik_m_cal = ~(iqik_m_cal >> 1);
	}

	temp_f = frequency * (u32)n_div * (u32)state->tun_fdiv;
	freq = temp_f / state->tun_xtal;
	tmp = freq * state->tun_xtal;

	if ((temp_f - tmp) >= (state->tun_xtal >> 1))
		freq++;

	freq += (u32) n << 13;
	/* Frequency OMEGA_IQIK_M_CAL_MID*/
	temp_f = freq + (u32)iqik_m_cal;

	set_tuner[3].reg[0] =  temp_f & 0xff;
	set_tuner[4].reg[0] =  (temp_f >> 8) & 0xff;

	deb_info("High Frequency = %04x", temp_f);

	/* Lower frequency */
	set_tuner[5].reg[0] =  freq & 0xff;
	set_tuner[6].reg[0] =  (freq >> 8) & 0xff;

	deb_info("low Frequency = %04x", freq);

	ret = it913x_fe_script_loader(state, set_tuner);

	return (ret < 0) ? -ENODEV : 0;
}

static int it913x_fe_select_bw(struct it913x_fe_state *state,
			u32 bandwidth, u32 adcFrequency)
{
	int ret, i;
	u8 buffer[256];
	u32 coeff[8];
	u16 bfsfcw_fftinx_ratio;
	u16 fftinx_bfsfcw_ratio;
	u8 count;
	u8 bw;
	u8 adcmultiplier;

	deb_info("Bandwidth %d Adc %d", bandwidth, adcFrequency);

	switch (bandwidth) {
	case 5000000:
		bw = 3;
		break;
	case 6000000:
		bw = 0;
		break;
	case 7000000:
		bw = 1;
		break;
	default:
	case 8000000:
		bw = 2;
		break;
	}
	ret = it913x_write_reg(state, PRO_DMOD, REG_BW, bw);

	if (state->table == NULL)
		return -EINVAL;

	/* In write order */
	coeff[0] = state->table[bw].coeff_1_2048;
	coeff[1] = state->table[bw].coeff_2_2k;
	coeff[2] = state->table[bw].coeff_1_8191;
	coeff[3] = state->table[bw].coeff_1_8192;
	coeff[4] = state->table[bw].coeff_1_8193;
	coeff[5] = state->table[bw].coeff_2_8k;
	coeff[6] = state->table[bw].coeff_1_4096;
	coeff[7] = state->table[bw].coeff_2_4k;
	bfsfcw_fftinx_ratio = state->table[bw].bfsfcw_fftinx_ratio;
	fftinx_bfsfcw_ratio = state->table[bw].fftinx_bfsfcw_ratio;

	/* ADC multiplier */
	ret = it913x_read_reg_u8(state, ADC_X_2);
	if (ret < 0)
		return -EINVAL;

	adcmultiplier = ret;

	count = 0;

	/*  Build Buffer for COEFF Registers */
	for (i = 0; i < 8; i++) {
		if (adcmultiplier == 1)
			coeff[i] /= 2;
		buffer[count++] = (coeff[i] >> 24) & 0x3;
		buffer[count++] = (coeff[i] >> 16) & 0xff;
		buffer[count++] = (coeff[i] >> 8) & 0xff;
		buffer[count++] = coeff[i] & 0xff;
	}

	/* bfsfcw_fftinx_ratio register 0x21-0x22 */
	buffer[count++] = bfsfcw_fftinx_ratio & 0xff;
	buffer[count++] = (bfsfcw_fftinx_ratio >> 8) & 0xff;
	/* fftinx_bfsfcw_ratio register 0x23-0x24 */
	buffer[count++] = fftinx_bfsfcw_ratio & 0xff;
	buffer[count++] = (fftinx_bfsfcw_ratio >> 8) & 0xff;
	/* start at COEFF_1_2048 and write through to fftinx_bfsfcw_ratio*/
	ret = it913x_write(state, PRO_DMOD, COEFF_1_2048, buffer, count);

	for (i = 0; i < 42; i += 8)
		debug_data_snipet(0x1, "Buffer", &buffer[i]);

	return ret;
}



static int it913x_fe_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
	struct it913x_fe_state *state = fe->demodulator_priv;
	int ret, i;
	fe_status_t old_status = state->it913x_status;
	*status = 0;

	if (state->it913x_status == 0) {
		ret = it913x_read_reg_u8(state, EMPTY_CHANNEL_STATUS);
		if (ret == 0x1) {
			*status |= FE_HAS_SIGNAL;
			for (i = 0; i < 40; i++) {
				ret = it913x_read_reg_u8(state, MP2IF_SYNC_LK);
				if (ret == 0x1)
					break;
				msleep(25);
			}
			if (ret == 0x1)
				*status |= FE_HAS_CARRIER
					| FE_HAS_VITERBI
					| FE_HAS_SYNC;
			state->it913x_status = *status;
		}
	}

	if (state->it913x_status & FE_HAS_SYNC) {
		ret = it913x_read_reg_u8(state, TPSD_LOCK);
		if (ret == 0x1)
			*status |= FE_HAS_LOCK
				| state->it913x_status;
		else
			state->it913x_status = 0;
		if (old_status != state->it913x_status)
			ret = it913x_write_reg(state, PRO_LINK, GPIOH3_O, ret);
	}

	return 0;
}

/* FEC values based on fe_code_rate_t non supported values 0*/
int it913x_qpsk_pval[] = {0, -93, -91, -90, 0, -89, -88};
int it913x_16qam_pval[] = {0, -87, -85, -84, 0, -83, -82};
int it913x_64qam_pval[] = {0, -82, -80, -78, 0, -77, -76};

static int it913x_get_signal_strength(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct it913x_fe_state *state = fe->demodulator_priv;
	u8 code_rate;
	int ret, temp;
	u8 lna_gain_os;

	ret = it913x_read_reg_u8(state, VAR_P_INBAND);
	if (ret < 0)
		return ret;

	/* VHF/UHF gain offset */
	if (state->frequency < 300000000)
		lna_gain_os = 7;
	else
		lna_gain_os = 14;

	temp = (ret - 100) - lna_gain_os;

	if (state->priority == PRIORITY_HIGH)
		code_rate = p->code_rate_HP;
	else
		code_rate = p->code_rate_LP;

	if (code_rate >= ARRAY_SIZE(it913x_qpsk_pval))
		return -EINVAL;

	deb_info("Reg VAR_P_INBAND:%d Calc Offset Value:%d", ret, temp);

	/* Apply FEC offset values*/
	switch (p->modulation) {
	case QPSK:
		temp -= it913x_qpsk_pval[code_rate];
		break;
	case QAM_16:
		temp -= it913x_16qam_pval[code_rate];
		break;
	case QAM_64:
		temp -= it913x_64qam_pval[code_rate];
		break;
	default:
		return -EINVAL;
	}

	if (temp < -15)
		ret = 0;
	else if ((-15 <= temp) && (temp < 0))
		ret = (2 * (temp + 15)) / 3;
	else if ((0 <= temp) && (temp < 20))
		ret = 4 * temp + 10;
	else if ((20 <= temp) && (temp < 35))
		ret = (2 * (temp - 20)) / 3 + 90;
	else if (temp >= 35)
		ret = 100;

	deb_info("Signal Strength :%d", ret);

	return ret;
}

static int it913x_fe_read_signal_strength(struct dvb_frontend *fe,
		u16 *strength)
{
	struct it913x_fe_state *state = fe->demodulator_priv;
	int ret = 0;
	if (state->config->read_slevel) {
		if (state->it913x_status & FE_HAS_SIGNAL)
			ret = it913x_read_reg_u8(state, SIGNAL_LEVEL);
	} else
		ret = it913x_get_signal_strength(fe);

	if (ret >= 0)
		*strength = (u16)((u32)ret * 0xffff / 0x64);

	return (ret < 0) ? -ENODEV : 0;
}

static int it913x_fe_read_snr(struct dvb_frontend *fe, u16 *snr)
{
	struct it913x_fe_state *state = fe->demodulator_priv;
	int ret;
	u8 reg[3];
	u32 snr_val, snr_min, snr_max;
	u32 temp;

	ret = it913x_read_reg(state, 0x2c, reg, sizeof(reg));

	snr_val = (u32)(reg[2] << 16) | (reg[1] << 8) | reg[0];

	ret |= it913x_read_reg(state, 0xf78b, reg, 1);
	if (reg[0])
		snr_val /= reg[0];

	if (state->transmission_mode == TRANSMISSION_MODE_2K)
		snr_val *= 4;
	else if (state->transmission_mode == TRANSMISSION_MODE_4K)
		snr_val *= 2;

	if (state->constellation == QPSK) {
		snr_min = 0xb4711;
		snr_max = 0x191451;
	} else if (state->constellation == QAM_16) {
		snr_min = 0x4f0d5;
		snr_max = 0xc7925;
	} else if (state->constellation == QAM_64) {
		snr_min = 0x256d0;
		snr_max = 0x626be;
	} else
		return -EINVAL;

	if (snr_val < snr_min)
		*snr = 0;
	else if (snr_val < snr_max) {
		temp = (snr_val - snr_min) >> 5;
		temp *= 0xffff;
		temp /= (snr_max - snr_min) >> 5;
		*snr = (u16)temp;
	} else
		*snr = 0xffff;

	return (ret < 0) ? -ENODEV : 0;
}

static int it913x_fe_read_ber(struct dvb_frontend *fe, u32 *ber)
{
	struct it913x_fe_state *state = fe->demodulator_priv;
	u8 reg[5];
	/* Read Aborted Packets and Pre-Viterbi error rate 5 bytes */
	it913x_read_reg(state, RSD_ABORT_PKT_LSB, reg, sizeof(reg));
	state->ucblocks += (u32)(reg[1] << 8) | reg[0];
	*ber = (u32)(reg[4] << 16) | (reg[3] << 8) | reg[2];
	return 0;
}

static int it913x_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
	struct it913x_fe_state *state = fe->demodulator_priv;
	int ret;
	u8 reg[2];
	/* Aborted Packets */
	ret = it913x_read_reg(state, RSD_ABORT_PKT_LSB, reg, sizeof(reg));
	state->ucblocks += (u32)(reg[1] << 8) | reg[0];
	*ucblocks = state->ucblocks;
	return ret;
}

static int it913x_fe_get_frontend(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct it913x_fe_state *state = fe->demodulator_priv;
	u8 reg[8];

	it913x_read_reg(state, REG_TPSD_TX_MODE, reg, sizeof(reg));

	if (reg[3] < 3)
		p->modulation = fe_con[reg[3]];

	if (reg[0] < 3)
		p->transmission_mode = fe_mode[reg[0]];

	if (reg[1] < 4)
		p->guard_interval = fe_gi[reg[1]];

	if (reg[2] < 4)
		p->hierarchy = fe_hi[reg[2]];

	state->priority = reg[5];

	p->code_rate_HP = (reg[6] < 6) ? fe_code[reg[6]] : FEC_NONE;
	p->code_rate_LP = (reg[7] < 6) ? fe_code[reg[7]] : FEC_NONE;

	/* Update internal state to reflect the autodetected props */
	state->constellation = p->modulation;
	state->transmission_mode = p->transmission_mode;

	return 0;
}

static int it913x_fe_set_frontend(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct it913x_fe_state *state = fe->demodulator_priv;
	int i;
	u8 empty_ch, last_ch;

	state->it913x_status = 0;

	/* Set bw*/
	it913x_fe_select_bw(state, p->bandwidth_hz,
		state->adcFrequency);

	/* Training Mode Off */
	it913x_write_reg(state, PRO_LINK, TRAINING_MODE, 0x0);

	/* Clear Empty Channel */
	it913x_write_reg(state, PRO_DMOD, EMPTY_CHANNEL_STATUS, 0x0);

	/* Clear bits */
	it913x_write_reg(state, PRO_DMOD, MP2IF_SYNC_LK, 0x0);
	/* LED on */
	it913x_write_reg(state, PRO_LINK, GPIOH3_O, 0x1);
	/* Select Band*/
	if ((p->frequency >= 51000000) && (p->frequency <= 230000000))
		i = 0;
	else if ((p->frequency >= 350000000) && (p->frequency <= 900000000))
			i = 1;
	else if ((p->frequency >= 1450000000) && (p->frequency <= 1680000000))
			i = 2;
	else
		return -EOPNOTSUPP;

	it913x_write_reg(state, PRO_DMOD, FREE_BAND, i);

	deb_info("Frontend Set Tuner Type %02x", state->tuner_type);
	switch (state->tuner_type) {
	case IT9135_38:
	case IT9135_51:
	case IT9135_52:
	case IT9135_60:
	case IT9135_61:
	case IT9135_62:
		it9137_set_tuner(state,
			p->bandwidth_hz, p->frequency);
		break;
	default:
		if (fe->ops.tuner_ops.set_params) {
			fe->ops.tuner_ops.set_params(fe);
			if (fe->ops.i2c_gate_ctrl)
				fe->ops.i2c_gate_ctrl(fe, 0);
		}
		break;
	}
	/* LED off */
	it913x_write_reg(state, PRO_LINK, GPIOH3_O, 0x0);
	/* Trigger ofsm */
	it913x_write_reg(state, PRO_DMOD, TRIGGER_OFSM, 0x0);
	last_ch = 2;
	for (i = 0; i < 40; ++i) {
		empty_ch = it913x_read_reg_u8(state, EMPTY_CHANNEL_STATUS);
		if (last_ch == 1 && empty_ch == 1)
			break;
		if (last_ch == 2 && empty_ch == 2)
			return 0;
		last_ch = empty_ch;
		msleep(25);
	}
	for (i = 0; i < 40; ++i) {
		if (it913x_read_reg_u8(state, D_TPSD_LOCK) == 1)
			break;
		msleep(25);
	}

	state->frequency = p->frequency;
	return 0;
}

static int it913x_fe_suspend(struct it913x_fe_state *state)
{
	int ret, i;
	u8 b;

	ret = it913x_write_reg(state, PRO_DMOD, SUSPEND_FLAG, 0x1);

	ret |= it913x_write_reg(state, PRO_DMOD, TRIGGER_OFSM, 0x0);

	for (i = 0; i < 128; i++) {
		ret = it913x_read_reg(state, SUSPEND_FLAG, &b, 1);
		if (ret < 0)
			return -ENODEV;
		if (b == 0)
			break;

	}

	ret |= it913x_write_reg(state, PRO_DMOD, AFE_MEM0, 0x8);
	/* Turn LED off */
	ret |= it913x_write_reg(state, PRO_LINK, GPIOH3_O, 0x0);

	ret |= it913x_fe_script_loader(state, it9137_tuner_off);

	return (ret < 0) ? -ENODEV : 0;
}

/* Power sequence */
/* Power Up	Tuner on -> Frontend suspend off -> Tuner clk on */
/* Power Down	Frontend suspend on -> Tuner clk off -> Tuner off */

static int it913x_fe_sleep(struct dvb_frontend *fe)
{
	struct it913x_fe_state *state = fe->demodulator_priv;
	return it913x_fe_suspend(state);
}

static u32 compute_div(u32 a, u32 b, u32 x)
{
	u32 res = 0;
	u32 c = 0;
	u32 i = 0;

	if (a > b) {
		c = a / b;
		a = a - c * b;
	}

	for (i = 0; i < x; i++) {
		if (a >= b) {
			res += 1;
			a -= b;
		}
		a <<= 1;
		res <<= 1;
	}

	res = (c << x) + res;

	return res;
}

static int it913x_fe_start(struct it913x_fe_state *state)
{
	struct it913xset *set_lna;
	struct it913xset *set_mode;
	int ret;
	u8 adf = (state->config->adf & 0xf);
	u32 adc, xtal;
	u8 b[4];

	if (state->config->chip_ver == 1)
		ret = it913x_init_tuner(state);

	info("ADF table value	:%02x", adf);

	if (adf < 10) {
		state->crystalFrequency = fe_clockTable[adf].xtal ;
		state->table = fe_clockTable[adf].table;
		state->adcFrequency = state->table->adcFrequency;

		adc = compute_div(state->adcFrequency, 1000000ul, 19ul);
		xtal = compute_div(state->crystalFrequency, 1000000ul, 19ul);

	} else
		return -EINVAL;

	/* Set LED indicator on GPIOH3 */
	ret = it913x_write_reg(state, PRO_LINK, GPIOH3_EN, 0x1);
	ret |= it913x_write_reg(state, PRO_LINK, GPIOH3_ON, 0x1);
	ret |= it913x_write_reg(state, PRO_LINK, GPIOH3_O, 0x1);

	ret |= it913x_write_reg(state, PRO_LINK, 0xf641, state->tuner_type);
	ret |= it913x_write_reg(state, PRO_DMOD, 0xf5ca, 0x01);
	ret |= it913x_write_reg(state, PRO_DMOD, 0xf715, 0x01);

	b[0] = xtal & 0xff;
	b[1] = (xtal >> 8) & 0xff;
	b[2] = (xtal >> 16) & 0xff;
	b[3] = (xtal >> 24);
	ret |= it913x_write(state, PRO_DMOD, XTAL_CLK, b , 4);

	b[0] = adc & 0xff;
	b[1] = (adc >> 8) & 0xff;
	b[2] = (adc >> 16) & 0xff;
	ret |= it913x_write(state, PRO_DMOD, ADC_FREQ, b, 3);

	if (state->config->adc_x2)
		ret |= it913x_write_reg(state, PRO_DMOD, ADC_X_2, 0x01);
	b[0] = 0;
	b[1] = 0;
	b[2] = 0;
	ret |= it913x_write(state, PRO_DMOD, 0x0029, b, 3);

	info("Crystal Frequency :%d Adc Frequency :%d ADC X2: %02x",
		state->crystalFrequency, state->adcFrequency,
			state->config->adc_x2);
	deb_info("Xtal value :%04x Adc value :%04x", xtal, adc);

	if (ret < 0)
		return -ENODEV;

	/* v1 or v2 tuner script */
	if (state->config->chip_ver > 1)
		ret = it913x_fe_script_loader(state, it9135_v2);
	else
		ret = it913x_fe_script_loader(state, it9135_v1);
	if (ret < 0)
		return ret;

	/* LNA Scripts */
	switch (state->tuner_type) {
	case IT9135_51:
		set_lna = it9135_51;
		break;
	case IT9135_52:
		set_lna = it9135_52;
		break;
	case IT9135_60:
		set_lna = it9135_60;
		break;
	case IT9135_61:
		set_lna = it9135_61;
		break;
	case IT9135_62:
		set_lna = it9135_62;
		break;
	case IT9135_38:
	default:
		set_lna = it9135_38;
	}
	info("Tuner LNA type :%02x", state->tuner_type);

	ret = it913x_fe_script_loader(state, set_lna);
	if (ret < 0)
		return ret;

	if (state->config->chip_ver == 2) {
		ret = it913x_write_reg(state, PRO_DMOD, TRIGGER_OFSM, 0x1);
		ret |= it913x_write_reg(state, PRO_LINK, PADODPU, 0x0);
		ret |= it913x_write_reg(state, PRO_LINK, AGC_O_D, 0x0);
		ret |= it913x_init_tuner(state);
	}
	if (ret < 0)
		return -ENODEV;

	/* Always solo frontend */
	set_mode = set_solo_fe;
	ret |= it913x_fe_script_loader(state, set_mode);

	ret |= it913x_fe_suspend(state);
	return (ret < 0) ? -ENODEV : 0;
}

static int it913x_fe_init(struct dvb_frontend *fe)
{
	struct it913x_fe_state *state = fe->demodulator_priv;
	int ret = 0;
	/* Power Up Tuner - common all versions */
	ret = it913x_write_reg(state, PRO_DMOD, 0xec40, 0x1);

	ret |= it913x_fe_script_loader(state, init_1);

	ret |= it913x_write_reg(state, PRO_DMOD, AFE_MEM0, 0x0);

	ret |= it913x_write_reg(state, PRO_DMOD, 0xfba8, 0x0);

	return (ret < 0) ? -ENODEV : 0;
}

static void it913x_fe_release(struct dvb_frontend *fe)
{
	struct it913x_fe_state *state = fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops it913x_fe_ofdm_ops;

struct dvb_frontend *it913x_fe_attach(struct i2c_adapter *i2c_adap,
		u8 i2c_addr, struct ite_config *config)
{
	struct it913x_fe_state *state = NULL;
	int ret;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct it913x_fe_state), GFP_KERNEL);
	if (state == NULL)
		return NULL;
	if (config == NULL)
		goto error;

	state->i2c_adap = i2c_adap;
	state->i2c_addr = i2c_addr;
	state->config = config;

	switch (state->config->tuner_id_0) {
	case IT9135_51:
	case IT9135_52:
	case IT9135_60:
	case IT9135_61:
	case IT9135_62:
		state->tuner_type = state->config->tuner_id_0;
		break;
	default:
	case IT9135_38:
		state->tuner_type = IT9135_38;
	}

	ret = it913x_fe_start(state);
	if (ret < 0)
		goto error;


	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &it913x_fe_ofdm_ops,
			sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;

	return &state->frontend;
error:
	kfree(state);
	return NULL;
}
EXPORT_SYMBOL(it913x_fe_attach);

static struct dvb_frontend_ops it913x_fe_ofdm_ops = {
	.delsys = { SYS_DVBT },
	.info = {
		.name			= "it913x-fe DVB-T",
		.frequency_min		= 51000000,
		.frequency_max		= 1680000000,
		.frequency_stepsize	= 62500,
		.caps = 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_8_9 | FE_CAN_FEC_AUTO |
			FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
			FE_CAN_TRANSMISSION_MODE_AUTO |
			FE_CAN_GUARD_INTERVAL_AUTO |
			FE_CAN_HIERARCHY_AUTO,
	},

	.release = it913x_fe_release,

	.init = it913x_fe_init,
	.sleep = it913x_fe_sleep,

	.set_frontend = it913x_fe_set_frontend,
	.get_frontend = it913x_fe_get_frontend,

	.read_status = it913x_fe_read_status,
	.read_signal_strength = it913x_fe_read_signal_strength,
	.read_snr = it913x_fe_read_snr,
	.read_ber = it913x_fe_read_ber,
	.read_ucblocks = it913x_fe_read_ucblocks,
};

MODULE_DESCRIPTION("it913x Frontend and it9137 tuner");
MODULE_AUTHOR("Malcolm Priestley tvboxspy@gmail.com");
MODULE_VERSION("1.15");
MODULE_LICENSE("GPL");