summaryrefslogtreecommitdiff
path: root/drivers/media/dvb-frontends/si2165.c
blob: 98ddb49ad52b1a27a268ef6fabab3d3de97496e7 (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
/*
    Driver for Silicon Labs Si2161 DVB-T and Si2165 DVB-C/-T Demodulator

    Copyright (C) 2013-2014 Matthias Schwarzott <zzam@gentoo.org>

    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.

    References:
    http://www.silabs.com/Support%20Documents/TechnicalDocs/Si2165-short.pdf
*/

#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/firmware.h>

#include "dvb_frontend.h"
#include "dvb_math.h"
#include "si2165_priv.h"
#include "si2165.h"

/* Hauppauge WinTV-HVR-930C-HD B130 / PCTV QuatroStick 521e 1113xx
 * uses 16 MHz xtal */

/* Hauppauge WinTV-HVR-930C-HD B131 / PCTV QuatroStick 522e 1114xx
 * uses 24 MHz clock provided by tuner */

struct si2165_state {
	struct i2c_adapter *i2c;

	struct dvb_frontend frontend;

	struct si2165_config config;

	u8 chip_revcode;
	u8 chip_type;

	/* calculated by xtal and div settings */
	u32 fvco_hz;
	u32 sys_clk;
	u32 adc_clk;

	bool has_dvbc;
	bool has_dvbt;
	bool firmware_loaded;
};

#define DEBUG_OTHER	0x01
#define DEBUG_I2C_WRITE	0x02
#define DEBUG_I2C_READ	0x04
#define DEBUG_REG_READ	0x08
#define DEBUG_REG_WRITE	0x10
#define DEBUG_FW_LOAD	0x20

static int debug = 0x00;

#define dprintk(args...) \
	do { \
		if (debug & DEBUG_OTHER) \
			printk(KERN_DEBUG "si2165: " args); \
	} while (0)

#define deb_i2c_write(args...) \
	do { \
		if (debug & DEBUG_I2C_WRITE) \
			printk(KERN_DEBUG "si2165: i2c write: " args); \
	} while (0)

#define deb_i2c_read(args...) \
	do { \
		if (debug & DEBUG_I2C_READ) \
			printk(KERN_DEBUG "si2165: i2c read: " args); \
	} while (0)

#define deb_readreg(args...) \
	do { \
		if (debug & DEBUG_REG_READ) \
			printk(KERN_DEBUG "si2165: reg read: " args); \
	} while (0)

#define deb_writereg(args...) \
	do { \
		if (debug & DEBUG_REG_WRITE) \
			printk(KERN_DEBUG "si2165: reg write: " args); \
	} while (0)

#define deb_fw_load(args...) \
	do { \
		if (debug & DEBUG_FW_LOAD) \
			printk(KERN_DEBUG "si2165: fw load: " args); \
	} while (0)

static int si2165_write(struct si2165_state *state, const u16 reg,
		       const u8 *src, const int count)
{
	int ret;
	struct i2c_msg msg;
	u8 buf[2 + 4]; /* write a maximum of 4 bytes of data */

	if (count + 2 > sizeof(buf)) {
		dev_warn(&state->i2c->dev,
			  "%s: i2c wr reg=%04x: count=%d is too big!\n",
			  KBUILD_MODNAME, reg, count);
		return -EINVAL;
	}
	buf[0] = reg >> 8;
	buf[1] = reg & 0xff;
	memcpy(buf + 2, src, count);

	msg.addr = state->config.i2c_addr;
	msg.flags = 0;
	msg.buf = buf;
	msg.len = count + 2;

	if (debug & DEBUG_I2C_WRITE)
		deb_i2c_write("reg: 0x%04x, data: %*ph\n", reg, count, src);

	ret = i2c_transfer(state->i2c, &msg, 1);

	if (ret != 1) {
		dev_err(&state->i2c->dev, "%s: ret == %d\n", __func__, ret);
		if (ret < 0)
			return ret;
		else
			return -EREMOTEIO;
	}

	return 0;
}

static int si2165_read(struct si2165_state *state,
		       const u16 reg, u8 *val, const int count)
{
	int ret;
	u8 reg_buf[] = { reg >> 8, reg & 0xff };
	struct i2c_msg msg[] = {
		{ .addr = state->config.i2c_addr,
		  .flags = 0, .buf = reg_buf, .len = 2 },
		{ .addr = state->config.i2c_addr,
		  .flags = I2C_M_RD, .buf = val, .len = count },
	};

	ret = i2c_transfer(state->i2c, msg, 2);

	if (ret != 2) {
		dev_err(&state->i2c->dev, "%s: error (addr %02x reg %04x error (ret == %i)\n",
			__func__, state->config.i2c_addr, reg, ret);
		if (ret < 0)
			return ret;
		else
			return -EREMOTEIO;
	}

	if (debug & DEBUG_I2C_READ)
		deb_i2c_read("reg: 0x%04x, data: %*ph\n", reg, count, val);

	return 0;
}

static int si2165_readreg8(struct si2165_state *state,
		       const u16 reg, u8 *val)
{
	int ret;

	ret = si2165_read(state, reg, val, 1);
	deb_readreg("R(0x%04x)=0x%02x\n", reg, *val);
	return ret;
}

static int si2165_readreg16(struct si2165_state *state,
		       const u16 reg, u16 *val)
{
	u8 buf[2];

	int ret = si2165_read(state, reg, buf, 2);
	*val = buf[0] | buf[1] << 8;
	deb_readreg("R(0x%04x)=0x%04x\n", reg, *val);
	return ret;
}

static int si2165_writereg8(struct si2165_state *state, const u16 reg, u8 val)
{
	return si2165_write(state, reg, &val, 1);
}

static int si2165_writereg16(struct si2165_state *state, const u16 reg, u16 val)
{
	u8 buf[2] = { val & 0xff, (val >> 8) & 0xff };

	return si2165_write(state, reg, buf, 2);
}

static int si2165_writereg24(struct si2165_state *state, const u16 reg, u32 val)
{
	u8 buf[3] = { val & 0xff, (val >> 8) & 0xff, (val >> 16) & 0xff };

	return si2165_write(state, reg, buf, 3);
}

static int si2165_writereg32(struct si2165_state *state, const u16 reg, u32 val)
{
	u8 buf[4] = {
		val & 0xff,
		(val >> 8) & 0xff,
		(val >> 16) & 0xff,
		(val >> 24) & 0xff
	};
	return si2165_write(state, reg, buf, 4);
}

static int si2165_writereg_mask8(struct si2165_state *state, const u16 reg,
				 u8 val, u8 mask)
{
	int ret;
	u8 tmp;

	if (mask != 0xff) {
		ret = si2165_readreg8(state, reg, &tmp);
		if (ret < 0)
			goto err;

		val &= mask;
		tmp &= ~mask;
		val |= tmp;
	}

	ret = si2165_writereg8(state, reg, val);
err:
	return ret;
}

static int si2165_get_tune_settings(struct dvb_frontend *fe,
				    struct dvb_frontend_tune_settings *s)
{
	s->min_delay_ms = 1000;
	return 0;
}

static int si2165_init_pll(struct si2165_state *state)
{
	u32 ref_freq_Hz = state->config.ref_freq_Hz;
	u8 divr = 1; /* 1..7 */
	u8 divp = 1; /* only 1 or 4 */
	u8 divn = 56; /* 1..63 */
	u8 divm = 8;
	u8 divl = 12;
	u8 buf[4];

	/* hardcoded values can be deleted if calculation is verified
	 * or it yields the same values as the windows driver */
	switch (ref_freq_Hz) {
	case 16000000u:
		divn = 56;
		break;
	case 24000000u:
		divr = 2;
		divp = 4;
		divn = 19;
		break;
	default:
		/* ref_freq / divr must be between 4 and 16 MHz */
		if (ref_freq_Hz > 16000000u)
			divr = 2;

		/* now select divn and divp such that
		 * fvco is in 1624..1824 MHz */
		if (1624000000u * divr > ref_freq_Hz * 2u * 63u)
			divp = 4;

		/* is this already correct regarding rounding? */
		divn = 1624000000u * divr / (ref_freq_Hz * 2u * divp);
		break;
	}

	/* adc_clk and sys_clk depend on xtal and pll settings */
	state->fvco_hz = ref_freq_Hz / divr
			* 2u * divn * divp;
	state->adc_clk = state->fvco_hz / (divm * 4u);
	state->sys_clk = state->fvco_hz / (divl * 2u);

	/* write pll registers 0x00a0..0x00a3 at once */
	buf[0] = divl;
	buf[1] = divm;
	buf[2] = (divn & 0x3f) | ((divp == 1) ? 0x40 : 0x00) | 0x80;
	buf[3] = divr;
	return si2165_write(state, 0x00a0, buf, 4);
}

static int si2165_adjust_pll_divl(struct si2165_state *state, u8 divl)
{
	state->sys_clk = state->fvco_hz / (divl * 2u);
	return si2165_writereg8(state, 0x00a0, divl); /* pll_divl */
}

static u32 si2165_get_fe_clk(struct si2165_state *state)
{
	/* assume Oversampling mode Ovr4 is used */
	return state->adc_clk;
}

static int si2165_wait_init_done(struct si2165_state *state)
{
	int ret = -EINVAL;
	u8 val = 0;
	int i;

	for (i = 0; i < 3; ++i) {
		si2165_readreg8(state, 0x0054, &val);
		if (val == 0x01)
			return 0;
		usleep_range(1000, 50000);
	}
	dev_err(&state->i2c->dev, "%s: init_done was not set\n",
		KBUILD_MODNAME);
	return ret;
}

static int si2165_upload_firmware_block(struct si2165_state *state,
	const u8 *data, u32 len, u32 *poffset, u32 block_count)
{
	int ret;
	u8 buf_ctrl[4] = { 0x00, 0x00, 0x00, 0xc0 };
	u8 wordcount;
	u32 cur_block = 0;
	u32 offset = poffset ? *poffset : 0;

	if (len < 4)
		return -EINVAL;
	if (len % 4 != 0)
		return -EINVAL;

	deb_fw_load("si2165_upload_firmware_block called with len=0x%x offset=0x%x blockcount=0x%x\n",
				len, offset, block_count);
	while (offset+12 <= len && cur_block < block_count) {
		deb_fw_load("si2165_upload_firmware_block in while len=0x%x offset=0x%x cur_block=0x%x blockcount=0x%x\n",
					len, offset, cur_block, block_count);
		wordcount = data[offset];
		if (wordcount < 1 || data[offset+1] ||
		    data[offset+2] || data[offset+3]) {
			dev_warn(&state->i2c->dev,
				 "%s: bad fw data[0..3] = %*ph\n",
				KBUILD_MODNAME, 4, data);
			return -EINVAL;
		}

		if (offset + 8 + wordcount * 4 > len) {
			dev_warn(&state->i2c->dev,
				 "%s: len is too small for block len=%d, wordcount=%d\n",
				KBUILD_MODNAME, len, wordcount);
			return -EINVAL;
		}

		buf_ctrl[0] = wordcount - 1;

		ret = si2165_write(state, 0x0364, buf_ctrl, 4);
		if (ret < 0)
			goto error;
		ret = si2165_write(state, 0x0368, data+offset+4, 4);
		if (ret < 0)
			goto error;

		offset += 8;

		while (wordcount > 0) {
			ret = si2165_write(state, 0x36c, data+offset, 4);
			if (ret < 0)
				goto error;
			wordcount--;
			offset += 4;
		}
		cur_block++;
	}

	deb_fw_load("si2165_upload_firmware_block after while len=0x%x offset=0x%x cur_block=0x%x blockcount=0x%x\n",
				len, offset, cur_block, block_count);

	if (poffset)
		*poffset = offset;

	deb_fw_load("si2165_upload_firmware_block returned offset=0x%x\n",
				offset);

	return 0;
error:
	return ret;
}

static int si2165_upload_firmware(struct si2165_state *state)
{
	/* int ret; */
	u8 val[3];
	u16 val16;
	int ret;

	const struct firmware *fw = NULL;
	u8 *fw_file;
	const u8 *data;
	u32 len;
	u32 offset;
	u8 patch_version;
	u8 block_count;
	u16 crc_expected;

	switch (state->chip_revcode) {
	case 0x03: /* revision D */
		fw_file = SI2165_FIRMWARE_REV_D;
		break;
	default:
		dev_info(&state->i2c->dev, "%s: no firmware file for revision=%d\n",
			KBUILD_MODNAME, state->chip_revcode);
		return 0;
	}

	/* request the firmware, this will block and timeout */
	ret = request_firmware(&fw, fw_file, state->i2c->dev.parent);
	if (ret) {
		dev_warn(&state->i2c->dev, "%s: firmware file '%s' not found\n",
				KBUILD_MODNAME, fw_file);
		goto error;
	}

	data = fw->data;
	len = fw->size;

	dev_info(&state->i2c->dev, "%s: downloading firmware from file '%s' size=%d\n",
			KBUILD_MODNAME, fw_file, len);

	if (len % 4 != 0) {
		dev_warn(&state->i2c->dev, "%s: firmware size is not multiple of 4\n",
				KBUILD_MODNAME);
		ret = -EINVAL;
		goto error;
	}

	/* check header (8 bytes) */
	if (len < 8) {
		dev_warn(&state->i2c->dev, "%s: firmware header is missing\n",
				KBUILD_MODNAME);
		ret = -EINVAL;
		goto error;
	}

	if (data[0] != 1 || data[1] != 0) {
		dev_warn(&state->i2c->dev, "%s: firmware file version is wrong\n",
				KBUILD_MODNAME);
		ret = -EINVAL;
		goto error;
	}

	patch_version = data[2];
	block_count = data[4];
	crc_expected = data[7] << 8 | data[6];

	/* start uploading fw */
	/* boot/wdog status */
	ret = si2165_writereg8(state, 0x0341, 0x00);
	if (ret < 0)
		goto error;
	/* reset */
	ret = si2165_writereg8(state, 0x00c0, 0x00);
	if (ret < 0)
		goto error;
	/* boot/wdog status */
	ret = si2165_readreg8(state, 0x0341, val);
	if (ret < 0)
		goto error;

	/* enable reset on error */
	ret = si2165_readreg8(state, 0x035c, val);
	if (ret < 0)
		goto error;
	ret = si2165_readreg8(state, 0x035c, val);
	if (ret < 0)
		goto error;
	ret = si2165_writereg8(state, 0x035c, 0x02);
	if (ret < 0)
		goto error;

	/* start right after the header */
	offset = 8;

	dev_info(&state->i2c->dev, "%s: si2165_upload_firmware extracted patch_version=0x%02x, block_count=0x%02x, crc_expected=0x%04x\n",
		KBUILD_MODNAME, patch_version, block_count, crc_expected);

	ret = si2165_upload_firmware_block(state, data, len, &offset, 1);
	if (ret < 0)
		goto error;

	ret = si2165_writereg8(state, 0x0344, patch_version);
	if (ret < 0)
		goto error;

	/* reset crc */
	ret = si2165_writereg8(state, 0x0379, 0x01);
	if (ret)
		return ret;

	ret = si2165_upload_firmware_block(state, data, len,
					   &offset, block_count);
	if (ret < 0) {
		dev_err(&state->i2c->dev,
			"%s: firmare could not be uploaded\n",
			KBUILD_MODNAME);
		goto error;
	}

	/* read crc */
	ret = si2165_readreg16(state, 0x037a, &val16);
	if (ret)
		goto error;

	if (val16 != crc_expected) {
		dev_err(&state->i2c->dev,
			"%s: firmware crc mismatch %04x != %04x\n",
			KBUILD_MODNAME, val16, crc_expected);
		ret = -EINVAL;
		goto error;
	}

	ret = si2165_upload_firmware_block(state, data, len, &offset, 5);
	if (ret)
		goto error;

	if (len != offset) {
		dev_err(&state->i2c->dev,
			"%s: firmare len mismatch %04x != %04x\n",
			KBUILD_MODNAME, len, offset);
		ret = -EINVAL;
		goto error;
	}

	/* reset watchdog error register */
	ret = si2165_writereg_mask8(state, 0x0341, 0x02, 0x02);
	if (ret < 0)
		goto error;

	/* enable reset on error */
	ret = si2165_writereg_mask8(state, 0x035c, 0x01, 0x01);
	if (ret < 0)
		goto error;

	dev_info(&state->i2c->dev, "%s: fw load finished\n", KBUILD_MODNAME);

	ret = 0;
	state->firmware_loaded = true;
error:
	if (fw) {
		release_firmware(fw);
		fw = NULL;
	}

	return ret;
}

static int si2165_init(struct dvb_frontend *fe)
{
	int ret = 0;
	struct si2165_state *state = fe->demodulator_priv;
	u8 val;
	u8 patch_version = 0x00;

	dprintk("%s: called\n", __func__);

	/* powerup */
	ret = si2165_writereg8(state, 0x0000, state->config.chip_mode);
	if (ret < 0)
		goto error;
	/* dsp_clock_enable */
	ret = si2165_writereg8(state, 0x0104, 0x01);
	if (ret < 0)
		goto error;
	ret = si2165_readreg8(state, 0x0000, &val); /* verify chip_mode */
	if (ret < 0)
		goto error;
	if (val != state->config.chip_mode) {
		dev_err(&state->i2c->dev, "%s: could not set chip_mode\n",
			KBUILD_MODNAME);
		return -EINVAL;
	}

	/* agc */
	ret = si2165_writereg8(state, 0x018b, 0x00);
	if (ret < 0)
		goto error;
	ret = si2165_writereg8(state, 0x0190, 0x01);
	if (ret < 0)
		goto error;
	ret = si2165_writereg8(state, 0x0170, 0x00);
	if (ret < 0)
		goto error;
	ret = si2165_writereg8(state, 0x0171, 0x07);
	if (ret < 0)
		goto error;
	/* rssi pad */
	ret = si2165_writereg8(state, 0x0646, 0x00);
	if (ret < 0)
		goto error;
	ret = si2165_writereg8(state, 0x0641, 0x00);
	if (ret < 0)
		goto error;

	ret = si2165_init_pll(state);
	if (ret < 0)
		goto error;

	/* enable chip_init */
	ret = si2165_writereg8(state, 0x0050, 0x01);
	if (ret < 0)
		goto error;
	/* set start_init */
	ret = si2165_writereg8(state, 0x0096, 0x01);
	if (ret < 0)
		goto error;
	ret = si2165_wait_init_done(state);
	if (ret < 0)
		goto error;

	/* disable chip_init */
	ret = si2165_writereg8(state, 0x0050, 0x00);
	if (ret < 0)
		goto error;

	/* ber_pkt */
	ret = si2165_writereg16(state, 0x0470 , 0x7530);
	if (ret < 0)
		goto error;

	ret = si2165_readreg8(state, 0x0344, &patch_version);
	if (ret < 0)
		goto error;

	ret = si2165_writereg8(state, 0x00cb, 0x00);
	if (ret < 0)
		goto error;

	/* dsp_addr_jump */
	ret = si2165_writereg32(state, 0x0348, 0xf4000000);
	if (ret < 0)
		goto error;
	/* boot/wdog status */
	ret = si2165_readreg8(state, 0x0341, &val);
	if (ret < 0)
		goto error;

	if (patch_version == 0x00) {
		ret = si2165_upload_firmware(state);
		if (ret < 0)
			goto error;
	}

	/* write adc values after each reset*/
	ret = si2165_writereg8(state, 0x012a, 0x46);
	if (ret < 0)
		goto error;
	ret = si2165_writereg8(state, 0x012c, 0x00);
	if (ret < 0)
		goto error;
	ret = si2165_writereg8(state, 0x012e, 0x0a);
	if (ret < 0)
		goto error;
	ret = si2165_writereg8(state, 0x012f, 0xff);
	if (ret < 0)
		goto error;
	ret = si2165_writereg8(state, 0x0123, 0x70);
	if (ret < 0)
		goto error;

	return 0;
error:
	return ret;
}

static int si2165_sleep(struct dvb_frontend *fe)
{
	int ret;
	struct si2165_state *state = fe->demodulator_priv;

	/* dsp clock disable */
	ret = si2165_writereg8(state, 0x0104, 0x00);
	if (ret < 0)
		return ret;
	/* chip mode */
	ret = si2165_writereg8(state, 0x0000, SI2165_MODE_OFF);
	if (ret < 0)
		return ret;
	return 0;
}

static int si2165_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
	int ret;
	u8 fec_lock = 0;
	struct si2165_state *state = fe->demodulator_priv;

	if (!state->has_dvbt)
		return -EINVAL;

	/* check fec_lock */
	ret = si2165_readreg8(state, 0x4e0, &fec_lock);
	if (ret < 0)
		return ret;
	*status = 0;
	if (fec_lock & 0x01) {
		*status |= FE_HAS_SIGNAL;
		*status |= FE_HAS_CARRIER;
		*status |= FE_HAS_VITERBI;
		*status |= FE_HAS_SYNC;
		*status |= FE_HAS_LOCK;
	}

	return 0;
}

static int si2165_set_oversamp(struct si2165_state *state, u32 dvb_rate)
{
	u64 oversamp;
	u32 reg_value;

	oversamp = si2165_get_fe_clk(state);
	oversamp <<= 23;
	do_div(oversamp, dvb_rate);
	reg_value = oversamp & 0x3fffffff;

	/* oversamp, usbdump contained 0x03100000; */
	return si2165_writereg32(state, 0x00e4, reg_value);
}

static int si2165_set_if_freq_shift(struct si2165_state *state, u32 IF)
{
	u64 if_freq_shift;
	s32 reg_value = 0;
	u32 fe_clk = si2165_get_fe_clk(state);

	if_freq_shift = IF;
	if_freq_shift <<= 29;

	do_div(if_freq_shift, fe_clk);
	reg_value = (s32)if_freq_shift;

	if (state->config.inversion)
		reg_value = -reg_value;

	reg_value = reg_value & 0x1fffffff;

	/* if_freq_shift, usbdump contained 0x023ee08f; */
	return si2165_writereg32(state, 0x00e8, reg_value);
}

static int si2165_set_parameters(struct dvb_frontend *fe)
{
	int ret;
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct si2165_state *state = fe->demodulator_priv;
	u8 val[3];
	u32 IF;
	u32 dvb_rate = 0;
	u16 bw10k;

	dprintk("%s: called\n", __func__);

	if (!fe->ops.tuner_ops.get_if_frequency) {
		dev_err(&state->i2c->dev,
			"%s: Error: get_if_frequency() not defined at tuner. Can't work without it!\n",
			KBUILD_MODNAME);
		return -EINVAL;
	}

	if (!state->has_dvbt)
		return -EINVAL;

	if (p->bandwidth_hz > 0) {
		dvb_rate = p->bandwidth_hz * 8 / 7;
		bw10k = p->bandwidth_hz / 10000;
	} else {
		dvb_rate = 8 * 8 / 7;
		bw10k = 800;
	}

	/* standard = DVB-T */
	ret = si2165_writereg8(state, 0x00ec, 0x01);
	if (ret < 0)
		return ret;
	ret = si2165_adjust_pll_divl(state, 12);
	if (ret < 0)
		return ret;

	fe->ops.tuner_ops.get_if_frequency(fe, &IF);
	ret = si2165_set_if_freq_shift(state, IF);
	if (ret < 0)
		return ret;
	ret = si2165_writereg8(state, 0x08f8, 0x00);
	if (ret < 0)
		return ret;
	/* ts output config */
	ret = si2165_writereg8(state, 0x04e4, 0x20);
	if (ret < 0)
		return ret;
	ret = si2165_writereg16(state, 0x04ef, 0x00fe);
	if (ret < 0)
		return ret;
	ret = si2165_writereg24(state, 0x04f4, 0x555555);
	if (ret < 0)
		return ret;
	ret = si2165_writereg8(state, 0x04e5, 0x01);
	if (ret < 0)
		return ret;
	/* bandwidth in 10KHz steps */
	ret = si2165_writereg16(state, 0x0308, bw10k);
	if (ret < 0)
		return ret;
	ret = si2165_set_oversamp(state, dvb_rate);
	if (ret < 0)
		return ret;
	/* impulsive_noise_remover */
	ret = si2165_writereg8(state, 0x031c, 0x01);
	if (ret < 0)
		return ret;
	ret = si2165_writereg8(state, 0x00cb, 0x00);
	if (ret < 0)
		return ret;
	/* agc2 */
	ret = si2165_writereg8(state, 0x016e, 0x41);
	if (ret < 0)
		return ret;
	ret = si2165_writereg8(state, 0x016c, 0x0e);
	if (ret < 0)
		return ret;
	ret = si2165_writereg8(state, 0x016d, 0x10);
	if (ret < 0)
		return ret;
	/* agc */
	ret = si2165_writereg8(state, 0x015b, 0x03);
	if (ret < 0)
		return ret;
	ret = si2165_writereg8(state, 0x0150, 0x78);
	if (ret < 0)
		return ret;
	/* agc */
	ret = si2165_writereg8(state, 0x01a0, 0x78);
	if (ret < 0)
		return ret;
	ret = si2165_writereg8(state, 0x01c8, 0x68);
	if (ret < 0)
		return ret;
	/* freq_sync_range */
	ret = si2165_writereg16(state, 0x030c, 0x0064);
	if (ret < 0)
		return ret;
	/* gp_reg0 */
	ret = si2165_readreg8(state, 0x0387, val);
	if (ret < 0)
		return ret;
	ret = si2165_writereg8(state, 0x0387, 0x00);
	if (ret < 0)
		return ret;
	/* dsp_addr_jump */
	ret = si2165_writereg32(state, 0x0348, 0xf4000000);
	if (ret < 0)
		return ret;

	if (fe->ops.tuner_ops.set_params)
		fe->ops.tuner_ops.set_params(fe);

	/* recalc if_freq_shift if IF might has changed */
	fe->ops.tuner_ops.get_if_frequency(fe, &IF);
	ret = si2165_set_if_freq_shift(state, IF);
	if (ret < 0)
		return ret;

	/* boot/wdog status */
	ret = si2165_readreg8(state, 0x0341, val);
	if (ret < 0)
		return ret;
	ret = si2165_writereg8(state, 0x0341, 0x00);
	if (ret < 0)
		return ret;
	/* reset all */
	ret = si2165_writereg8(state, 0x00c0, 0x00);
	if (ret < 0)
		return ret;
	/* gp_reg0 */
	ret = si2165_writereg32(state, 0x0384, 0x00000000);
	if (ret < 0)
		return ret;
	/* start_synchro */
	ret = si2165_writereg8(state, 0x02e0, 0x01);
	if (ret < 0)
		return ret;
	/* boot/wdog status */
	ret = si2165_readreg8(state, 0x0341, val);
	if (ret < 0)
		return ret;

	return 0;
}

static void si2165_release(struct dvb_frontend *fe)
{
	struct si2165_state *state = fe->demodulator_priv;

	dprintk("%s: called\n", __func__);
	kfree(state);
}

static struct dvb_frontend_ops si2165_ops = {
	.info = {
		.name = "Silicon Labs ",
		.caps =	FE_CAN_FEC_1_2 |
			FE_CAN_FEC_2_3 |
			FE_CAN_FEC_3_4 |
			FE_CAN_FEC_5_6 |
			FE_CAN_FEC_7_8 |
			FE_CAN_FEC_AUTO |
			FE_CAN_QPSK |
			FE_CAN_QAM_16 |
			FE_CAN_QAM_32 |
			FE_CAN_QAM_64 |
			FE_CAN_QAM_128 |
			FE_CAN_QAM_256 |
			FE_CAN_QAM_AUTO |
			FE_CAN_TRANSMISSION_MODE_AUTO |
			FE_CAN_GUARD_INTERVAL_AUTO |
			FE_CAN_HIERARCHY_AUTO |
			FE_CAN_MUTE_TS |
			FE_CAN_TRANSMISSION_MODE_AUTO |
			FE_CAN_RECOVER
	},

	.get_tune_settings = si2165_get_tune_settings,

	.init = si2165_init,
	.sleep = si2165_sleep,

	.set_frontend      = si2165_set_parameters,
	.read_status       = si2165_read_status,

	.release = si2165_release,
};

struct dvb_frontend *si2165_attach(const struct si2165_config *config,
				   struct i2c_adapter *i2c)
{
	struct si2165_state *state = NULL;
	int n;
	int io_ret;
	u8 val;
	char rev_char;
	const char *chip_name;

	if (config == NULL || i2c == NULL)
		goto error;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct si2165_state), GFP_KERNEL);
	if (state == NULL)
		goto error;

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

	if (state->config.ref_freq_Hz < 4000000
	    || state->config.ref_freq_Hz > 27000000) {
		dev_err(&state->i2c->dev, "%s: ref_freq of %d Hz not supported by this driver\n",
			 KBUILD_MODNAME, state->config.ref_freq_Hz);
		goto error;
	}

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &si2165_ops,
		sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;

	/* powerup */
	io_ret = si2165_writereg8(state, 0x0000, state->config.chip_mode);
	if (io_ret < 0)
		goto error;

	io_ret = si2165_readreg8(state, 0x0000, &val);
	if (io_ret < 0)
		goto error;
	if (val != state->config.chip_mode)
		goto error;

	io_ret = si2165_readreg8(state, 0x0023, &state->chip_revcode);
	if (io_ret < 0)
		goto error;

	io_ret = si2165_readreg8(state, 0x0118, &state->chip_type);
	if (io_ret < 0)
		goto error;

	/* powerdown */
	io_ret = si2165_writereg8(state, 0x0000, SI2165_MODE_OFF);
	if (io_ret < 0)
		goto error;

	if (state->chip_revcode < 26)
		rev_char = 'A' + state->chip_revcode;
	else
		rev_char = '?';

	switch (state->chip_type) {
	case 0x06:
		chip_name = "Si2161";
		state->has_dvbt = true;
		break;
	case 0x07:
		chip_name = "Si2165";
		state->has_dvbt = true;
		state->has_dvbc = true;
		break;
	default:
		dev_err(&state->i2c->dev, "%s: Unsupported Silicon Labs chip (type %d, rev %d)\n",
			KBUILD_MODNAME, state->chip_type, state->chip_revcode);
		goto error;
	}

	dev_info(&state->i2c->dev,
		"%s: Detected Silicon Labs %s-%c (type %d, rev %d)\n",
		KBUILD_MODNAME, chip_name, rev_char, state->chip_type,
		state->chip_revcode);

	strlcat(state->frontend.ops.info.name, chip_name,
			sizeof(state->frontend.ops.info.name));

	n = 0;
	if (state->has_dvbt) {
		state->frontend.ops.delsys[n++] = SYS_DVBT;
		strlcat(state->frontend.ops.info.name, " DVB-T",
			sizeof(state->frontend.ops.info.name));
	}
	if (state->has_dvbc)
		dev_warn(&state->i2c->dev, "%s: DVB-C is not yet supported.\n",
		       KBUILD_MODNAME);

	return &state->frontend;

error:
	kfree(state);
	return NULL;
}
EXPORT_SYMBOL(si2165_attach);

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

MODULE_DESCRIPTION("Silicon Labs Si2165 DVB-C/-T Demodulator driver");
MODULE_AUTHOR("Matthias Schwarzott <zzam@gentoo.org>");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE(SI2165_FIRMWARE_REV_D);