summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb-frontends/dib3000mb.c
blob: 0f0480d8576d77264fc8815d4df888972b790c57 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Frontend driver for mobile DVB-T demodulator DiBcom 3000M-B
 * DiBcom (http://www.dibcom.fr/)
 *
 * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@posteo.de)
 *
 * based on GPL code from DibCom, which has
 *
 * Copyright (C) 2004 Amaury Demol for DiBcom
 *
 * Acknowledgements
 *
 *  Amaury Demol from DiBcom for providing specs and driver
 *  sources, on which this driver (and the dvb-dibusb) are based.
 *
 * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

#include <media/dvb_frontend.h>

#include "dib3000.h"
#include "dib3000mb_priv.h"

/* Version information */
#define DRIVER_VERSION "0.1"
#define DRIVER_DESC "DiBcom 3000M-B DVB-T demodulator"
#define DRIVER_AUTHOR "Patrick Boettcher, patrick.boettcher@posteo.de"

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "set debugging level (1=info,2=xfer,4=setfe,8=getfe (|-able)).");

#define deb_info(args...) dprintk(0x01, args)
#define deb_i2c(args...)  dprintk(0x02, args)
#define deb_srch(args...) dprintk(0x04, args)
#define deb_info(args...) dprintk(0x01, args)
#define deb_xfer(args...) dprintk(0x02, args)
#define deb_setf(args...) dprintk(0x04, args)
#define deb_getf(args...) dprintk(0x08, args)

static int dib3000_read_reg(struct dib3000_state *state, u16 reg)
{
	u8 wb[] = { ((reg >> 8) | 0x80) & 0xff, reg & 0xff };
	u8 rb[2];
	struct i2c_msg msg[] = {
		{ .addr = state->config.demod_address, .flags = 0,        .buf = wb, .len = 2 },
		{ .addr = state->config.demod_address, .flags = I2C_M_RD, .buf = rb, .len = 2 },
	};

	if (i2c_transfer(state->i2c, msg, 2) != 2)
		deb_i2c("i2c read error\n");

	deb_i2c("reading i2c bus (reg: %5d 0x%04x, val: %5d 0x%04x)\n",reg,reg,
			(rb[0] << 8) | rb[1],(rb[0] << 8) | rb[1]);

	return (rb[0] << 8) | rb[1];
}

static int dib3000_write_reg(struct dib3000_state *state, u16 reg, u16 val)
{
	u8 b[] = {
		(reg >> 8) & 0xff, reg & 0xff,
		(val >> 8) & 0xff, val & 0xff,
	};
	struct i2c_msg msg[] = {
		{ .addr = state->config.demod_address, .flags = 0, .buf = b, .len = 4 }
	};
	deb_i2c("writing i2c bus (reg: %5d 0x%04x, val: %5d 0x%04x)\n",reg,reg,val,val);

	return i2c_transfer(state->i2c,msg, 1) != 1 ? -EREMOTEIO : 0;
}

static int dib3000_search_status(u16 irq,u16 lock)
{
	if (irq & 0x02) {
		if (lock & 0x01) {
			deb_srch("auto search succeeded\n");
			return 1; // auto search succeeded
		} else {
			deb_srch("auto search not successful\n");
			return 0; // auto search failed
		}
	} else if (irq & 0x01)  {
		deb_srch("auto search failed\n");
		return 0; // auto search failed
	}
	return -1; // try again
}

/* for auto search */
static u16 dib3000_seq[2][2][2] =     /* fft,gua,   inv   */
	{ /* fft */
		{ /* gua */
			{ 0, 1 },                   /*  0   0   { 0,1 } */
			{ 3, 9 },                   /*  0   1   { 0,1 } */
		},
		{
			{ 2, 5 },                   /*  1   0   { 0,1 } */
			{ 6, 11 },                  /*  1   1   { 0,1 } */
		}
	};

static int dib3000mb_get_frontend(struct dvb_frontend* fe,
				  struct dtv_frontend_properties *c);

static int dib3000mb_set_frontend(struct dvb_frontend *fe, int tuner)
{
	struct dib3000_state* state = fe->demodulator_priv;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	enum fe_code_rate fe_cr = FEC_NONE;
	int search_state, seq;

	if (tuner && 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);

		switch (c->bandwidth_hz) {
			case 8000000:
				wr_foreach(dib3000mb_reg_timing_freq, dib3000mb_timing_freq[2]);
				wr_foreach(dib3000mb_reg_bandwidth, dib3000mb_bandwidth_8mhz);
				break;
			case 7000000:
				wr_foreach(dib3000mb_reg_timing_freq, dib3000mb_timing_freq[1]);
				wr_foreach(dib3000mb_reg_bandwidth, dib3000mb_bandwidth_7mhz);
				break;
			case 6000000:
				wr_foreach(dib3000mb_reg_timing_freq, dib3000mb_timing_freq[0]);
				wr_foreach(dib3000mb_reg_bandwidth, dib3000mb_bandwidth_6mhz);
				break;
			case 0:
				return -EOPNOTSUPP;
			default:
				pr_err("unknown bandwidth value.\n");
				return -EINVAL;
		}
		deb_setf("bandwidth: %d MHZ\n", c->bandwidth_hz / 1000000);
	}
	wr(DIB3000MB_REG_LOCK1_MASK, DIB3000MB_LOCK1_SEARCH_4);

	switch (c->transmission_mode) {
		case TRANSMISSION_MODE_2K:
			deb_setf("transmission mode: 2k\n");
			wr(DIB3000MB_REG_FFT, DIB3000_TRANSMISSION_MODE_2K);
			break;
		case TRANSMISSION_MODE_8K:
			deb_setf("transmission mode: 8k\n");
			wr(DIB3000MB_REG_FFT, DIB3000_TRANSMISSION_MODE_8K);
			break;
		case TRANSMISSION_MODE_AUTO:
			deb_setf("transmission mode: auto\n");
			break;
		default:
			return -EINVAL;
	}

	switch (c->guard_interval) {
		case GUARD_INTERVAL_1_32:
			deb_setf("guard 1_32\n");
			wr(DIB3000MB_REG_GUARD_TIME, DIB3000_GUARD_TIME_1_32);
			break;
		case GUARD_INTERVAL_1_16:
			deb_setf("guard 1_16\n");
			wr(DIB3000MB_REG_GUARD_TIME, DIB3000_GUARD_TIME_1_16);
			break;
		case GUARD_INTERVAL_1_8:
			deb_setf("guard 1_8\n");
			wr(DIB3000MB_REG_GUARD_TIME, DIB3000_GUARD_TIME_1_8);
			break;
		case GUARD_INTERVAL_1_4:
			deb_setf("guard 1_4\n");
			wr(DIB3000MB_REG_GUARD_TIME, DIB3000_GUARD_TIME_1_4);
			break;
		case GUARD_INTERVAL_AUTO:
			deb_setf("guard auto\n");
			break;
		default:
			return -EINVAL;
	}

	switch (c->inversion) {
		case INVERSION_OFF:
			deb_setf("inversion off\n");
			wr(DIB3000MB_REG_DDS_INV, DIB3000_DDS_INVERSION_OFF);
			break;
		case INVERSION_AUTO:
			deb_setf("inversion auto\n");
			break;
		case INVERSION_ON:
			deb_setf("inversion on\n");
			wr(DIB3000MB_REG_DDS_INV, DIB3000_DDS_INVERSION_ON);
			break;
		default:
			return -EINVAL;
	}

	switch (c->modulation) {
		case QPSK:
			deb_setf("modulation: qpsk\n");
			wr(DIB3000MB_REG_QAM, DIB3000_CONSTELLATION_QPSK);
			break;
		case QAM_16:
			deb_setf("modulation: qam16\n");
			wr(DIB3000MB_REG_QAM, DIB3000_CONSTELLATION_16QAM);
			break;
		case QAM_64:
			deb_setf("modulation: qam64\n");
			wr(DIB3000MB_REG_QAM, DIB3000_CONSTELLATION_64QAM);
			break;
		case QAM_AUTO:
			break;
		default:
			return -EINVAL;
	}
	switch (c->hierarchy) {
		case HIERARCHY_NONE:
			deb_setf("hierarchy: none\n");
			/* fall through */
		case HIERARCHY_1:
			deb_setf("hierarchy: alpha=1\n");
			wr(DIB3000MB_REG_VIT_ALPHA, DIB3000_ALPHA_1);
			break;
		case HIERARCHY_2:
			deb_setf("hierarchy: alpha=2\n");
			wr(DIB3000MB_REG_VIT_ALPHA, DIB3000_ALPHA_2);
			break;
		case HIERARCHY_4:
			deb_setf("hierarchy: alpha=4\n");
			wr(DIB3000MB_REG_VIT_ALPHA, DIB3000_ALPHA_4);
			break;
		case HIERARCHY_AUTO:
			deb_setf("hierarchy: alpha=auto\n");
			break;
		default:
			return -EINVAL;
	}

	if (c->hierarchy == HIERARCHY_NONE) {
		wr(DIB3000MB_REG_VIT_HRCH, DIB3000_HRCH_OFF);
		wr(DIB3000MB_REG_VIT_HP, DIB3000_SELECT_HP);
		fe_cr = c->code_rate_HP;
	} else if (c->hierarchy != HIERARCHY_AUTO) {
		wr(DIB3000MB_REG_VIT_HRCH, DIB3000_HRCH_ON);
		wr(DIB3000MB_REG_VIT_HP, DIB3000_SELECT_LP);
		fe_cr = c->code_rate_LP;
	}
	switch (fe_cr) {
		case FEC_1_2:
			deb_setf("fec: 1_2\n");
			wr(DIB3000MB_REG_VIT_CODE_RATE, DIB3000_FEC_1_2);
			break;
		case FEC_2_3:
			deb_setf("fec: 2_3\n");
			wr(DIB3000MB_REG_VIT_CODE_RATE, DIB3000_FEC_2_3);
			break;
		case FEC_3_4:
			deb_setf("fec: 3_4\n");
			wr(DIB3000MB_REG_VIT_CODE_RATE, DIB3000_FEC_3_4);
			break;
		case FEC_5_6:
			deb_setf("fec: 5_6\n");
			wr(DIB3000MB_REG_VIT_CODE_RATE, DIB3000_FEC_5_6);
			break;
		case FEC_7_8:
			deb_setf("fec: 7_8\n");
			wr(DIB3000MB_REG_VIT_CODE_RATE, DIB3000_FEC_7_8);
			break;
		case FEC_NONE:
			deb_setf("fec: none\n");
			break;
		case FEC_AUTO:
			deb_setf("fec: auto\n");
			break;
		default:
			return -EINVAL;
	}

	seq = dib3000_seq
		[c->transmission_mode == TRANSMISSION_MODE_AUTO]
		[c->guard_interval == GUARD_INTERVAL_AUTO]
		[c->inversion == INVERSION_AUTO];

	deb_setf("seq? %d\n", seq);

	wr(DIB3000MB_REG_SEQ, seq);

	wr(DIB3000MB_REG_ISI, seq ? DIB3000MB_ISI_INHIBIT : DIB3000MB_ISI_ACTIVATE);

	if (c->transmission_mode == TRANSMISSION_MODE_2K) {
		if (c->guard_interval == GUARD_INTERVAL_1_8) {
			wr(DIB3000MB_REG_SYNC_IMPROVEMENT, DIB3000MB_SYNC_IMPROVE_2K_1_8);
		} else {
			wr(DIB3000MB_REG_SYNC_IMPROVEMENT, DIB3000MB_SYNC_IMPROVE_DEFAULT);
		}

		wr(DIB3000MB_REG_UNK_121, DIB3000MB_UNK_121_2K);
	} else {
		wr(DIB3000MB_REG_UNK_121, DIB3000MB_UNK_121_DEFAULT);
	}

	wr(DIB3000MB_REG_MOBILE_ALGO, DIB3000MB_MOBILE_ALGO_OFF);
	wr(DIB3000MB_REG_MOBILE_MODE_QAM, DIB3000MB_MOBILE_MODE_QAM_OFF);
	wr(DIB3000MB_REG_MOBILE_MODE, DIB3000MB_MOBILE_MODE_OFF);

	wr_foreach(dib3000mb_reg_agc_bandwidth, dib3000mb_agc_bandwidth_high);

	wr(DIB3000MB_REG_ISI, DIB3000MB_ISI_ACTIVATE);

	wr(DIB3000MB_REG_RESTART, DIB3000MB_RESTART_AGC + DIB3000MB_RESTART_CTRL);
	wr(DIB3000MB_REG_RESTART, DIB3000MB_RESTART_OFF);

	/* wait for AGC lock */
	msleep(70);

	wr_foreach(dib3000mb_reg_agc_bandwidth, dib3000mb_agc_bandwidth_low);

	/* something has to be auto searched */
	if (c->modulation == QAM_AUTO ||
		c->hierarchy == HIERARCHY_AUTO ||
		fe_cr == FEC_AUTO ||
		c->inversion == INVERSION_AUTO) {
		int as_count=0;

		deb_setf("autosearch enabled.\n");

		wr(DIB3000MB_REG_ISI, DIB3000MB_ISI_INHIBIT);

		wr(DIB3000MB_REG_RESTART, DIB3000MB_RESTART_AUTO_SEARCH);
		wr(DIB3000MB_REG_RESTART, DIB3000MB_RESTART_OFF);

		while ((search_state =
				dib3000_search_status(
					rd(DIB3000MB_REG_AS_IRQ_PENDING),
					rd(DIB3000MB_REG_LOCK2_VALUE))) < 0 && as_count++ < 100)
			msleep(1);

		deb_setf("search_state after autosearch %d after %d checks\n",
			 search_state, as_count);

		if (search_state == 1) {
			if (dib3000mb_get_frontend(fe, c) == 0) {
				deb_setf("reading tuning data from frontend succeeded.\n");
				return dib3000mb_set_frontend(fe, 0);
			}
		}

	} else {
		wr(DIB3000MB_REG_RESTART, DIB3000MB_RESTART_CTRL);
		wr(DIB3000MB_REG_RESTART, DIB3000MB_RESTART_OFF);
	}

	return 0;
}

static int dib3000mb_fe_init(struct dvb_frontend* fe, int mobile_mode)
{
	struct dib3000_state* state = fe->demodulator_priv;

	deb_info("dib3000mb is getting up.\n");
	wr(DIB3000MB_REG_POWER_CONTROL, DIB3000MB_POWER_UP);

	wr(DIB3000MB_REG_RESTART, DIB3000MB_RESTART_AGC);

	wr(DIB3000MB_REG_RESET_DEVICE, DIB3000MB_RESET_DEVICE);
	wr(DIB3000MB_REG_RESET_DEVICE, DIB3000MB_RESET_DEVICE_RST);

	wr(DIB3000MB_REG_CLOCK, DIB3000MB_CLOCK_DEFAULT);

	wr(DIB3000MB_REG_ELECT_OUT_MODE, DIB3000MB_ELECT_OUT_MODE_ON);

	wr(DIB3000MB_REG_DDS_FREQ_MSB, DIB3000MB_DDS_FREQ_MSB);
	wr(DIB3000MB_REG_DDS_FREQ_LSB, DIB3000MB_DDS_FREQ_LSB);

	wr_foreach(dib3000mb_reg_timing_freq, dib3000mb_timing_freq[2]);

	wr_foreach(dib3000mb_reg_impulse_noise,
			dib3000mb_impulse_noise_values[DIB3000MB_IMPNOISE_OFF]);

	wr_foreach(dib3000mb_reg_agc_gain, dib3000mb_default_agc_gain);

	wr(DIB3000MB_REG_PHASE_NOISE, DIB3000MB_PHASE_NOISE_DEFAULT);

	wr_foreach(dib3000mb_reg_phase_noise, dib3000mb_default_noise_phase);

	wr_foreach(dib3000mb_reg_lock_duration, dib3000mb_default_lock_duration);

	wr_foreach(dib3000mb_reg_agc_bandwidth, dib3000mb_agc_bandwidth_low);

	wr(DIB3000MB_REG_LOCK0_MASK, DIB3000MB_LOCK0_DEFAULT);
	wr(DIB3000MB_REG_LOCK1_MASK, DIB3000MB_LOCK1_SEARCH_4);
	wr(DIB3000MB_REG_LOCK2_MASK, DIB3000MB_LOCK2_DEFAULT);
	wr(DIB3000MB_REG_SEQ, dib3000_seq[1][1][1]);

	wr_foreach(dib3000mb_reg_bandwidth, dib3000mb_bandwidth_8mhz);

	wr(DIB3000MB_REG_UNK_68, DIB3000MB_UNK_68);
	wr(DIB3000MB_REG_UNK_69, DIB3000MB_UNK_69);
	wr(DIB3000MB_REG_UNK_71, DIB3000MB_UNK_71);
	wr(DIB3000MB_REG_UNK_77, DIB3000MB_UNK_77);
	wr(DIB3000MB_REG_UNK_78, DIB3000MB_UNK_78);
	wr(DIB3000MB_REG_ISI, DIB3000MB_ISI_INHIBIT);
	wr(DIB3000MB_REG_UNK_92, DIB3000MB_UNK_92);
	wr(DIB3000MB_REG_UNK_96, DIB3000MB_UNK_96);
	wr(DIB3000MB_REG_UNK_97, DIB3000MB_UNK_97);
	wr(DIB3000MB_REG_UNK_106, DIB3000MB_UNK_106);
	wr(DIB3000MB_REG_UNK_107, DIB3000MB_UNK_107);
	wr(DIB3000MB_REG_UNK_108, DIB3000MB_UNK_108);
	wr(DIB3000MB_REG_UNK_122, DIB3000MB_UNK_122);
	wr(DIB3000MB_REG_MOBILE_MODE_QAM, DIB3000MB_MOBILE_MODE_QAM_OFF);
	wr(DIB3000MB_REG_BERLEN, DIB3000MB_BERLEN_DEFAULT);

	wr_foreach(dib3000mb_reg_filter_coeffs, dib3000mb_filter_coeffs);

	wr(DIB3000MB_REG_MOBILE_ALGO, DIB3000MB_MOBILE_ALGO_ON);
	wr(DIB3000MB_REG_MULTI_DEMOD_MSB, DIB3000MB_MULTI_DEMOD_MSB);
	wr(DIB3000MB_REG_MULTI_DEMOD_LSB, DIB3000MB_MULTI_DEMOD_LSB);

	wr(DIB3000MB_REG_OUTPUT_MODE, DIB3000MB_OUTPUT_MODE_SLAVE);

	wr(DIB3000MB_REG_FIFO_142, DIB3000MB_FIFO_142);
	wr(DIB3000MB_REG_MPEG2_OUT_MODE, DIB3000MB_MPEG2_OUT_MODE_188);
	wr(DIB3000MB_REG_PID_PARSE, DIB3000MB_PID_PARSE_ACTIVATE);
	wr(DIB3000MB_REG_FIFO, DIB3000MB_FIFO_INHIBIT);
	wr(DIB3000MB_REG_FIFO_146, DIB3000MB_FIFO_146);
	wr(DIB3000MB_REG_FIFO_147, DIB3000MB_FIFO_147);

	wr(DIB3000MB_REG_DATA_IN_DIVERSITY, DIB3000MB_DATA_DIVERSITY_IN_OFF);

	return 0;
}

static int dib3000mb_get_frontend(struct dvb_frontend* fe,
				  struct dtv_frontend_properties *c)
{
	struct dib3000_state* state = fe->demodulator_priv;
	enum fe_code_rate *cr;
	u16 tps_val;
	int inv_test1,inv_test2;
	u32 dds_val, threshold = 0x800000;

	if (!rd(DIB3000MB_REG_TPS_LOCK))
		return 0;

	dds_val = ((rd(DIB3000MB_REG_DDS_VALUE_MSB) & 0xff) << 16) + rd(DIB3000MB_REG_DDS_VALUE_LSB);
	deb_getf("DDS_VAL: %x %x %x\n", dds_val, rd(DIB3000MB_REG_DDS_VALUE_MSB), rd(DIB3000MB_REG_DDS_VALUE_LSB));
	if (dds_val < threshold)
		inv_test1 = 0;
	else if (dds_val == threshold)
		inv_test1 = 1;
	else
		inv_test1 = 2;

	dds_val = ((rd(DIB3000MB_REG_DDS_FREQ_MSB) & 0xff) << 16) + rd(DIB3000MB_REG_DDS_FREQ_LSB);
	deb_getf("DDS_FREQ: %x %x %x\n", dds_val, rd(DIB3000MB_REG_DDS_FREQ_MSB), rd(DIB3000MB_REG_DDS_FREQ_LSB));
	if (dds_val < threshold)
		inv_test2 = 0;
	else if (dds_val == threshold)
		inv_test2 = 1;
	else
		inv_test2 = 2;

	c->inversion =
		((inv_test2 == 2) && (inv_test1==1 || inv_test1==0)) ||
		((inv_test2 == 0) && (inv_test1==1 || inv_test1==2)) ?
		INVERSION_ON : INVERSION_OFF;

	deb_getf("inversion %d %d, %d\n", inv_test2, inv_test1, c->inversion);

	switch ((tps_val = rd(DIB3000MB_REG_TPS_QAM))) {
		case DIB3000_CONSTELLATION_QPSK:
			deb_getf("QPSK\n");
			c->modulation = QPSK;
			break;
		case DIB3000_CONSTELLATION_16QAM:
			deb_getf("QAM16\n");
			c->modulation = QAM_16;
			break;
		case DIB3000_CONSTELLATION_64QAM:
			deb_getf("QAM64\n");
			c->modulation = QAM_64;
			break;
		default:
			pr_err("Unexpected constellation returned by TPS (%d)\n", tps_val);
			break;
	}
	deb_getf("TPS: %d\n", tps_val);

	if (rd(DIB3000MB_REG_TPS_HRCH)) {
		deb_getf("HRCH ON\n");
		cr = &c->code_rate_LP;
		c->code_rate_HP = FEC_NONE;
		switch ((tps_val = rd(DIB3000MB_REG_TPS_VIT_ALPHA))) {
			case DIB3000_ALPHA_0:
				deb_getf("HIERARCHY_NONE\n");
				c->hierarchy = HIERARCHY_NONE;
				break;
			case DIB3000_ALPHA_1:
				deb_getf("HIERARCHY_1\n");
				c->hierarchy = HIERARCHY_1;
				break;
			case DIB3000_ALPHA_2:
				deb_getf("HIERARCHY_2\n");
				c->hierarchy = HIERARCHY_2;
				break;
			case DIB3000_ALPHA_4:
				deb_getf("HIERARCHY_4\n");
				c->hierarchy = HIERARCHY_4;
				break;
			default:
				pr_err("Unexpected ALPHA value returned by TPS (%d)\n", tps_val);
				break;
		}
		deb_getf("TPS: %d\n", tps_val);

		tps_val = rd(DIB3000MB_REG_TPS_CODE_RATE_LP);
	} else {
		deb_getf("HRCH OFF\n");
		cr = &c->code_rate_HP;
		c->code_rate_LP = FEC_NONE;
		c->hierarchy = HIERARCHY_NONE;

		tps_val = rd(DIB3000MB_REG_TPS_CODE_RATE_HP);
	}

	switch (tps_val) {
		case DIB3000_FEC_1_2:
			deb_getf("FEC_1_2\n");
			*cr = FEC_1_2;
			break;
		case DIB3000_FEC_2_3:
			deb_getf("FEC_2_3\n");
			*cr = FEC_2_3;
			break;
		case DIB3000_FEC_3_4:
			deb_getf("FEC_3_4\n");
			*cr = FEC_3_4;
			break;
		case DIB3000_FEC_5_6:
			deb_getf("FEC_5_6\n");
			*cr = FEC_4_5;
			break;
		case DIB3000_FEC_7_8:
			deb_getf("FEC_7_8\n");
			*cr = FEC_7_8;
			break;
		default:
			pr_err("Unexpected FEC returned by TPS (%d)\n", tps_val);
			break;
	}
	deb_getf("TPS: %d\n",tps_val);

	switch ((tps_val = rd(DIB3000MB_REG_TPS_GUARD_TIME))) {
		case DIB3000_GUARD_TIME_1_32:
			deb_getf("GUARD_INTERVAL_1_32\n");
			c->guard_interval = GUARD_INTERVAL_1_32;
			break;
		case DIB3000_GUARD_TIME_1_16:
			deb_getf("GUARD_INTERVAL_1_16\n");
			c->guard_interval = GUARD_INTERVAL_1_16;
			break;
		case DIB3000_GUARD_TIME_1_8:
			deb_getf("GUARD_INTERVAL_1_8\n");
			c->guard_interval = GUARD_INTERVAL_1_8;
			break;
		case DIB3000_GUARD_TIME_1_4:
			deb_getf("GUARD_INTERVAL_1_4\n");
			c->guard_interval = GUARD_INTERVAL_1_4;
			break;
		default:
			pr_err("Unexpected Guard Time returned by TPS (%d)\n", tps_val);
			break;
	}
	deb_getf("TPS: %d\n", tps_val);

	switch ((tps_val = rd(DIB3000MB_REG_TPS_FFT))) {
		case DIB3000_TRANSMISSION_MODE_2K:
			deb_getf("TRANSMISSION_MODE_2K\n");
			c->transmission_mode = TRANSMISSION_MODE_2K;
			break;
		case DIB3000_TRANSMISSION_MODE_8K:
			deb_getf("TRANSMISSION_MODE_8K\n");
			c->transmission_mode = TRANSMISSION_MODE_8K;
			break;
		default:
			pr_err("unexpected transmission mode return by TPS (%d)\n", tps_val);
			break;
	}
	deb_getf("TPS: %d\n", tps_val);

	return 0;
}

static int dib3000mb_read_status(struct dvb_frontend *fe,
				 enum fe_status *stat)
{
	struct dib3000_state* state = fe->demodulator_priv;

	*stat = 0;

	if (rd(DIB3000MB_REG_AGC_LOCK))
		*stat |= FE_HAS_SIGNAL;
	if (rd(DIB3000MB_REG_CARRIER_LOCK))
		*stat |= FE_HAS_CARRIER;
	if (rd(DIB3000MB_REG_VIT_LCK))
		*stat |= FE_HAS_VITERBI;
	if (rd(DIB3000MB_REG_TS_SYNC_LOCK))
		*stat |= (FE_HAS_SYNC | FE_HAS_LOCK);

	deb_getf("actual status is %2x\n",*stat);

	deb_getf("autoval: tps: %d, qam: %d, hrch: %d, alpha: %d, hp: %d, lp: %d, guard: %d, fft: %d cell: %d\n",
			rd(DIB3000MB_REG_TPS_LOCK),
			rd(DIB3000MB_REG_TPS_QAM),
			rd(DIB3000MB_REG_TPS_HRCH),
			rd(DIB3000MB_REG_TPS_VIT_ALPHA),
			rd(DIB3000MB_REG_TPS_CODE_RATE_HP),
			rd(DIB3000MB_REG_TPS_CODE_RATE_LP),
			rd(DIB3000MB_REG_TPS_GUARD_TIME),
			rd(DIB3000MB_REG_TPS_FFT),
			rd(DIB3000MB_REG_TPS_CELL_ID));

	//*stat = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
	return 0;
}

static int dib3000mb_read_ber(struct dvb_frontend* fe, u32 *ber)
{
	struct dib3000_state* state = fe->demodulator_priv;

	*ber = ((rd(DIB3000MB_REG_BER_MSB) << 16) | rd(DIB3000MB_REG_BER_LSB));
	return 0;
}

/* see dib3000-watch dvb-apps for exact calcuations of signal_strength and snr */
static int dib3000mb_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
{
	struct dib3000_state* state = fe->demodulator_priv;

	*strength = rd(DIB3000MB_REG_SIGNAL_POWER) * 0xffff / 0x170;
	return 0;
}

static int dib3000mb_read_snr(struct dvb_frontend* fe, u16 *snr)
{
	struct dib3000_state* state = fe->demodulator_priv;
	short sigpow = rd(DIB3000MB_REG_SIGNAL_POWER);
	int icipow = ((rd(DIB3000MB_REG_NOISE_POWER_MSB) & 0xff) << 16) |
		rd(DIB3000MB_REG_NOISE_POWER_LSB);
	*snr = (sigpow << 8) / ((icipow > 0) ? icipow : 1);
	return 0;
}

static int dib3000mb_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
{
	struct dib3000_state* state = fe->demodulator_priv;

	*unc = rd(DIB3000MB_REG_PACKET_ERROR_RATE);
	return 0;
}

static int dib3000mb_sleep(struct dvb_frontend* fe)
{
	struct dib3000_state* state = fe->demodulator_priv;
	deb_info("dib3000mb is going to bed.\n");
	wr(DIB3000MB_REG_POWER_CONTROL, DIB3000MB_POWER_DOWN);
	return 0;
}

static int dib3000mb_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
{
	tune->min_delay_ms = 800;
	return 0;
}

static int dib3000mb_fe_init_nonmobile(struct dvb_frontend* fe)
{
	return dib3000mb_fe_init(fe, 0);
}

static int dib3000mb_set_frontend_and_tuner(struct dvb_frontend *fe)
{
	return dib3000mb_set_frontend(fe, 1);
}

static void dib3000mb_release(struct dvb_frontend* fe)
{
	struct dib3000_state *state = fe->demodulator_priv;
	kfree(state);
}

/* pid filter and transfer stuff */
static int dib3000mb_pid_control(struct dvb_frontend *fe,int index, int pid,int onoff)
{
	struct dib3000_state *state = fe->demodulator_priv;
	pid = (onoff ? pid | DIB3000_ACTIVATE_PID_FILTERING : 0);
	wr(index+DIB3000MB_REG_FIRST_PID,pid);
	return 0;
}

static int dib3000mb_fifo_control(struct dvb_frontend *fe, int onoff)
{
	struct dib3000_state *state = fe->demodulator_priv;

	deb_xfer("%s fifo\n",onoff ? "enabling" : "disabling");
	if (onoff) {
		wr(DIB3000MB_REG_FIFO, DIB3000MB_FIFO_ACTIVATE);
	} else {
		wr(DIB3000MB_REG_FIFO, DIB3000MB_FIFO_INHIBIT);
	}
	return 0;
}

static int dib3000mb_pid_parse(struct dvb_frontend *fe, int onoff)
{
	struct dib3000_state *state = fe->demodulator_priv;
	deb_xfer("%s pid parsing\n",onoff ? "enabling" : "disabling");
	wr(DIB3000MB_REG_PID_PARSE,onoff);
	return 0;
}

static int dib3000mb_tuner_pass_ctrl(struct dvb_frontend *fe, int onoff, u8 pll_addr)
{
	struct dib3000_state *state = fe->demodulator_priv;
	if (onoff) {
		wr(DIB3000MB_REG_TUNER, DIB3000_TUNER_WRITE_ENABLE(pll_addr));
	} else {
		wr(DIB3000MB_REG_TUNER, DIB3000_TUNER_WRITE_DISABLE(pll_addr));
	}
	return 0;
}

static const struct dvb_frontend_ops dib3000mb_ops;

struct dvb_frontend* dib3000mb_attach(const struct dib3000_config* config,
				      struct i2c_adapter* i2c, struct dib_fe_xfer_ops *xfer_ops)
{
	struct dib3000_state* state = NULL;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct dib3000_state), GFP_KERNEL);
	if (state == NULL)
		goto error;

	/* setup the state */
	state->i2c = i2c;
	memcpy(&state->config,config,sizeof(struct dib3000_config));

	/* check for the correct demod */
	if (rd(DIB3000_REG_MANUFACTOR_ID) != DIB3000_I2C_ID_DIBCOM)
		goto error;

	if (rd(DIB3000_REG_DEVICE_ID) != DIB3000MB_DEVICE_ID)
		goto error;

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &dib3000mb_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;

	/* set the xfer operations */
	xfer_ops->pid_parse = dib3000mb_pid_parse;
	xfer_ops->fifo_ctrl = dib3000mb_fifo_control;
	xfer_ops->pid_ctrl = dib3000mb_pid_control;
	xfer_ops->tuner_pass_ctrl = dib3000mb_tuner_pass_ctrl;

	return &state->frontend;

error:
	kfree(state);
	return NULL;
}

static const struct dvb_frontend_ops dib3000mb_ops = {
	.delsys = { SYS_DVBT },
	.info = {
		.name			= "DiBcom 3000M-B DVB-T",
		.frequency_min_hz	=  44250 * kHz,
		.frequency_max_hz	= 867250 * kHz,
		.frequency_stepsize_hz	= 62500,
		.caps = FE_CAN_INVERSION_AUTO |
				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_64 | FE_CAN_QAM_AUTO |
				FE_CAN_TRANSMISSION_MODE_AUTO |
				FE_CAN_GUARD_INTERVAL_AUTO |
				FE_CAN_RECOVER |
				FE_CAN_HIERARCHY_AUTO,
	},

	.release = dib3000mb_release,

	.init = dib3000mb_fe_init_nonmobile,
	.sleep = dib3000mb_sleep,

	.set_frontend = dib3000mb_set_frontend_and_tuner,
	.get_frontend = dib3000mb_get_frontend,
	.get_tune_settings = dib3000mb_fe_get_tune_settings,

	.read_status = dib3000mb_read_status,
	.read_ber = dib3000mb_read_ber,
	.read_signal_strength = dib3000mb_read_signal_strength,
	.read_snr = dib3000mb_read_snr,
	.read_ucblocks = dib3000mb_read_unc_blocks,
};

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(dib3000mb_attach);