aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb/frontends/dvb-pll.c
blob: fce5c425225242cf3c16d232c5f39e4799a1e1fe (plain) (blame)
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
/*
 * descriptions + helper functions for simple dvb plls.
 *
 * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
 *
 *  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/dvb/frontend.h>
#include <asm/types.h>

#include "dvb-pll.h"

/* ----------------------------------------------------------- */
/* descriptions                                                */

struct dvb_pll_desc dvb_pll_thomson_dtt7579 = {
	.name  = "Thomson dtt7579",
	.min   = 177000000,
	.max   = 858000000,
	.count = 5,
	.entries = {
		{          0, 36166667, 166666, 0xb4, 0x03 }, /* go sleep */
		{  443250000, 36166667, 166666, 0xb4, 0x02 },
		{  542000000, 36166667, 166666, 0xb4, 0x08 },
		{  771000000, 36166667, 166666, 0xbc, 0x08 },
		{  999999999, 36166667, 166666, 0xf4, 0x08 },
	},
};
EXPORT_SYMBOL(dvb_pll_thomson_dtt7579);

struct dvb_pll_desc dvb_pll_thomson_dtt7610 = {
	.name  = "Thomson dtt7610",
	.min   =  44000000,
	.max   = 958000000,
	.count = 3,
	.entries = {
		{ 157250000, 44000000, 62500, 0x8e, 0x39 },
		{ 454000000, 44000000, 62500, 0x8e, 0x3a },
		{ 999999999, 44000000, 62500, 0x8e, 0x3c },
	},
};
EXPORT_SYMBOL(dvb_pll_thomson_dtt7610);

static void thomson_dtt759x_bw(u8 *buf, u32 freq, int bandwidth)
{
	if (BANDWIDTH_7_MHZ == bandwidth)
		buf[3] |= 0x10;
}

struct dvb_pll_desc dvb_pll_thomson_dtt759x = {
	.name  = "Thomson dtt759x",
	.min   = 177000000,
	.max   = 896000000,
	.setbw = thomson_dtt759x_bw,
	.count = 6,
	.entries = {
		{          0, 36166667, 166666, 0x84, 0x03 },
		{  264000000, 36166667, 166666, 0xb4, 0x02 },
		{  470000000, 36166667, 166666, 0xbc, 0x02 },
		{  735000000, 36166667, 166666, 0xbc, 0x08 },
		{  835000000, 36166667, 166666, 0xf4, 0x08 },
		{  999999999, 36166667, 166666, 0xfc, 0x08 },
	},
};
EXPORT_SYMBOL(dvb_pll_thomson_dtt759x);

struct dvb_pll_desc dvb_pll_lg_z201 = {
	.name  = "LG z201",
	.min   = 174000000,
	.max   = 862000000,
	.count = 6,
	.entries = {
		{          0, 36166667, 166666, 0xbc, 0x03 },
		{  157500000, 36166667, 166666, 0xbc, 0x01 },
		{  443250000, 36166667, 166666, 0xbc, 0x02 },
		{  542000000, 36166667, 166666, 0xbc, 0x04 },
		{  830000000, 36166667, 166666, 0xf4, 0x04 },
		{  999999999, 36166667, 166666, 0xfc, 0x04 },
	},
};
EXPORT_SYMBOL(dvb_pll_lg_z201);

struct dvb_pll_desc dvb_pll_microtune_4042 = {
	.name  = "Microtune 4042 FI5",
	.min   =  57000000,
	.max   = 858000000,
	.count = 3,
	.entries = {
		{ 162000000, 44000000, 62500, 0x8e, 0xa1 },
		{ 457000000, 44000000, 62500, 0x8e, 0x91 },
		{ 999999999, 44000000, 62500, 0x8e, 0x31 },
	},
};
EXPORT_SYMBOL(dvb_pll_microtune_4042);

struct dvb_pll_desc dvb_pll_thomson_dtt761x = {
	/* DTT 7611 7611A 7612 7613 7613A 7614 7615 7615A */
	.name  = "Thomson dtt761x",
	.min   =  57000000,
	.max   = 863000000,
	.count = 3,
	.entries = {
		{ 147000000, 44000000, 62500, 0x8e, 0x39 },
		{ 417000000, 44000000, 62500, 0x8e, 0x3a },
		{ 999999999, 44000000, 62500, 0x8e, 0x3c },
	},
};
EXPORT_SYMBOL(dvb_pll_thomson_dtt761x);

struct dvb_pll_desc dvb_pll_unknown_1 = {
	.name  = "unknown 1", /* used by dntv live dvb-t */
	.min   = 174000000,
	.max   = 862000000,
	.count = 9,
	.entries = {
		{  150000000, 36166667, 166666, 0xb4, 0x01 },
		{  173000000, 36166667, 166666, 0xbc, 0x01 },
		{  250000000, 36166667, 166666, 0xb4, 0x02 },
		{  400000000, 36166667, 166666, 0xbc, 0x02 },
		{  420000000, 36166667, 166666, 0xf4, 0x02 },
		{  470000000, 36166667, 166666, 0xfc, 0x02 },
		{  600000000, 36166667, 166666, 0xbc, 0x08 },
		{  730000000, 36166667, 166666, 0xf4, 0x08 },
		{  999999999, 36166667, 166666, 0xfc, 0x08 },
	},
};
EXPORT_SYMBOL(dvb_pll_unknown_1);

/* Infineon TUA6010XS
 * used in Thomson Cable Tuner
 */
struct dvb_pll_desc dvb_pll_tua6010xs = {
	.name  = "Infineon TUA6010XS",
	.min   =  44250000,
	.max   = 858000000,
	.count = 3,
	.entries = {
		{  115750000, 36125000, 62500, 0x8e, 0x03 },
		{  403250000, 36125000, 62500, 0x8e, 0x06 },
		{  999999999, 36125000, 62500, 0x8e, 0x85 },
	},
};
EXPORT_SYMBOL(dvb_pll_tua6010xs);

/* Panasonic env57h1xd5 (some Philips PLL ?) */
struct dvb_pll_desc dvb_pll_env57h1xd5 = {
	.name  = "Panasonic ENV57H1XD5",
	.min   =  44250000,
	.max   = 858000000,
	.count = 4,
	.entries = {
		{  153000000, 36291666, 166666, 0xc2, 0x41 },
		{  470000000, 36291666, 166666, 0xc2, 0x42 },
		{  526000000, 36291666, 166666, 0xc2, 0x84 },
		{  999999999, 36291666, 166666, 0xc2, 0xa4 },
	},
};
EXPORT_SYMBOL(dvb_pll_env57h1xd5);

/* Philips TDA6650/TDA6651
 * used in Panasonic ENV77H11D5
 */
static void tda665x_bw(u8 *buf, u32 freq, int bandwidth)
{
	if (bandwidth == BANDWIDTH_8_MHZ)
		buf[3] |= 0x08;
}

struct dvb_pll_desc dvb_pll_tda665x = {
	.name  = "Philips TDA6650/TDA6651",
	.min   =  44250000,
	.max   = 858000000,
	.setbw = tda665x_bw,
	.count = 12,
	.entries = {
		{   93834000, 36249333, 166667, 0xca, 0x61 /* 011 0 0 0  01 */ },
		{  123834000, 36249333, 166667, 0xca, 0xa1 /* 101 0 0 0  01 */ },
		{  161000000, 36249333, 166667, 0xca, 0xa1 /* 101 0 0 0  01 */ },
		{  163834000, 36249333, 166667, 0xca, 0xc2 /* 110 0 0 0  10 */ },
		{  253834000, 36249333, 166667, 0xca, 0x62 /* 011 0 0 0  10 */ },
		{  383834000, 36249333, 166667, 0xca, 0xa2 /* 101 0 0 0  10 */ },
		{  443834000, 36249333, 166667, 0xca, 0xc2 /* 110 0 0 0  10 */ },
		{  444000000, 36249333, 166667, 0xca, 0xc4 /* 110 0 0 1  00 */ },
		{  583834000, 36249333, 166667, 0xca, 0x64 /* 011 0 0 1  00 */ },
		{  793834000, 36249333, 166667, 0xca, 0xa4 /* 101 0 0 1  00 */ },
		{  444834000, 36249333, 166667, 0xca, 0xc4 /* 110 0 0 1  00 */ },
		{  861000000, 36249333, 166667, 0xca, 0xe4 /* 111 0 0 1  00 */ },
	}
};
EXPORT_SYMBOL(dvb_pll_tda665x);

/* Infineon TUA6034
 * used in LG TDTP E102P
 */
static void tua6034_bw(u8 *buf, u32 freq, int bandwidth)
{
	if (BANDWIDTH_7_MHZ != bandwidth)
		buf[3] |= 0x08;
}

struct dvb_pll_desc dvb_pll_tua6034 = {
	.name  = "Infineon TUA6034",
	.min   =  44250000,
	.max   = 858000000,
	.count = 3,
	.setbw = tua6034_bw,
	.entries = {
		{  174500000, 36166667, 62500, 0xce, 0x01 },
		{  230000000, 36166667, 62500, 0xce, 0x02 },
		{  999999999, 36166667, 62500, 0xce, 0x04 },
	},
};
EXPORT_SYMBOL(dvb_pll_tua6034);

/* Infineon TUA6034
 * used in LG TDVS-H061F, LG TDVS-H062F and LG TDVS-H064F
 */
struct dvb_pll_desc dvb_pll_lg_tdvs_h06xf = {
	.name  = "LG TDVS-H06xF",
	.min   =  54000000,
	.max   = 863000000,
	.count = 3,
	.entries = {
		{  165000000, 44000000, 62500, 0xce, 0x01 },
		{  450000000, 44000000, 62500, 0xce, 0x02 },
		{  999999999, 44000000, 62500, 0xce, 0x04 },
	},
};
EXPORT_SYMBOL(dvb_pll_lg_tdvs_h06xf);

/* Philips FMD1216ME
 * used in Medion Hybrid PCMCIA card and USB Box
 */
static void fmd1216me_bw(u8 *buf, u32 freq, int bandwidth)
{
	if (bandwidth == BANDWIDTH_8_MHZ && freq >= 158870000)
		buf[3] |= 0x08;
}

struct dvb_pll_desc dvb_pll_fmd1216me = {
	.name = "Philips FMD1216ME",
	.min = 50870000,
	.max = 858000000,
	.setbw = fmd1216me_bw,
	.count = 7,
	.entries = {
		{ 143870000, 36213333, 166667, 0xbc, 0x41 },
		{ 158870000, 36213333, 166667, 0xf4, 0x41 },
		{ 329870000, 36213333, 166667, 0xbc, 0x42 },
		{ 441870000, 36213333, 166667, 0xf4, 0x42 },
		{ 625870000, 36213333, 166667, 0xbc, 0x44 },
		{ 803870000, 36213333, 166667, 0xf4, 0x44 },
		{ 999999999, 36213333, 166667, 0xfc, 0x44 },
	}
};
EXPORT_SYMBOL(dvb_pll_fmd1216me);

/* ALPS TDED4
 * used in Nebula-Cards and USB boxes
 */
static void tded4_bw(u8 *buf, u32 freq, int bandwidth)
{
	if (bandwidth == BANDWIDTH_8_MHZ)
		buf[3] |= 0x04;
}

struct dvb_pll_desc dvb_pll_tded4 = {
	.name = "ALPS TDED4",
	.min = 47000000,
	.max = 863000000,
	.setbw = tded4_bw,
	.count = 4,
	.entries = {
		{ 153000000, 36166667, 166667, 0x85, 0x01 },
		{ 470000000, 36166667, 166667, 0x85, 0x02 },
		{ 823000000, 36166667, 166667, 0x85, 0x08 },
		{ 999999999, 36166667, 166667, 0x85, 0x88 },
	}
};
EXPORT_SYMBOL(dvb_pll_tded4);

/* ALPS TDHU2
 * used in AverTVHD MCE A180
 */
struct dvb_pll_desc dvb_pll_tdhu2 = {
	.name = "ALPS TDHU2",
	.min = 54000000,
	.max = 864000000,
	.count = 4,
	.entries = {
		{ 162000000, 44000000, 62500, 0x85, 0x01 },
		{ 426000000, 44000000, 62500, 0x85, 0x02 },
		{ 782000000, 44000000, 62500, 0x85, 0x08 },
		{ 999999999, 44000000, 62500, 0x85, 0x88 },
	}
};
EXPORT_SYMBOL(dvb_pll_tdhu2);

/* Philips TUV1236D
 * used in ATI HDTV Wonder
 */
struct dvb_pll_desc dvb_pll_tuv1236d = {
	.name  = "Philips TUV1236D",
	.min   =  54000000,
	.max   = 864000000,
	.count = 3,
	.entries = {
		{ 157250000, 44000000, 62500, 0xc6, 0x41 },
		{ 454000000, 44000000, 62500, 0xc6, 0x42 },
		{ 999999999, 44000000, 62500, 0xc6, 0x44 },
	},
};
EXPORT_SYMBOL(dvb_pll_tuv1236d);

/* Samsung TBMV30111IN / TBMV30712IN1
 * used in Air2PC ATSC - 2nd generation (nxt2002)
 */
struct dvb_pll_desc dvb_pll_samsung_tbmv = {
	.name = "Samsung TBMV30111IN / TBMV30712IN1",
	.min = 54000000,
	.max = 860000000,
	.count = 6,
	.entries = {
		{ 172000000, 44000000, 166666, 0xb4, 0x01 },
		{ 214000000, 44000000, 166666, 0xb4, 0x02 },
		{ 467000000, 44000000, 166666, 0xbc, 0x02 },
		{ 721000000, 44000000, 166666, 0xbc, 0x08 },
		{ 841000000, 44000000, 166666, 0xf4, 0x08 },
		{ 999999999, 44000000, 166666, 0xfc, 0x02 },
	}
};
EXPORT_SYMBOL(dvb_pll_samsung_tbmv);

/*
 * Philips SD1878 Tuner.
 */
struct dvb_pll_desc dvb_pll_philips_sd1878_tda8261 = {
	.name  = "Philips SD1878",
	.min   =  950000,
	.max   = 2150000,
	.count = 4,
	.entries = {
		{ 1250000, 499, 500, 0xc4, 0x00},
		{ 1550000, 499, 500, 0xc4, 0x40},
		{ 2050000, 499, 500, 0xc4, 0x80},
		{ 2150000, 499, 500, 0xc4, 0xc0},
	},
};
EXPORT_SYMBOL(dvb_pll_philips_sd1878_tda8261);

/*
 * Philips TD1316 Tuner.
 */
static void td1316_bw(u8 *buf, u32 freq, int bandwidth)
{
	u8 band;

	/* determine band */
	if (freq < 161000000)
		band = 1;
	else if (freq < 444000000)
		band = 2;
	else
		band = 4;

	buf[3] |= band;

	/* setup PLL filter */
	if (bandwidth == BANDWIDTH_8_MHZ)
		buf[3] |= 1 << 3;
}

struct dvb_pll_desc dvb_pll_philips_td1316 = {
	.name  = "Philips TD1316",
	.min   =  87000000,
	.max   = 895000000,
	.setbw = td1316_bw,
	.count = 9,
	.entries = {
		{  93834000, 36166000, 166666, 0xca, 0x60},
		{ 123834000, 36166000, 166666, 0xca, 0xa0},
		{ 163834000, 36166000, 166666, 0xca, 0xc0},
		{ 253834000, 36166000, 166666, 0xca, 0x60},
		{ 383834000, 36166000, 166666, 0xca, 0xa0},
		{ 443834000, 36166000, 166666, 0xca, 0xc0},
		{ 583834000, 36166000, 166666, 0xca, 0x60},
		{ 793834000, 36166000, 166666, 0xca, 0xa0},
		{ 858834000, 36166000, 166666, 0xca, 0xe0},
	},
};
EXPORT_SYMBOL(dvb_pll_philips_td1316);

/* FE6600 used on DViCO Hybrid */
struct dvb_pll_desc dvb_pll_thomson_fe6600 = {
	.name = "Thomson FE6600",
	.min =  44250000,
	.max = 858000000,
	.count = 4,
	.entries = {
		{ 250000000, 36213333, 166667, 0xb4, 0x12 },
		{ 455000000, 36213333, 166667, 0xfe, 0x11 },
		{ 775500000, 36213333, 166667, 0xbc, 0x18 },
		{ 999999999, 36213333, 166667, 0xf4, 0x18 },
	}
};
EXPORT_SYMBOL(dvb_pll_thomson_fe6600);

struct dvb_pll_priv {
	/* i2c details */
	int pll_i2c_address;
	struct i2c_adapter *i2c;

	/* the PLL descriptor */
	struct dvb_pll_desc *pll_desc;

	/* cached frequency/bandwidth */
	u32 frequency;
	u32 bandwidth;
};

/* ----------------------------------------------------------- */
/* code                                                        */

static int debug = 0;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable verbose debug messages");

int dvb_pll_configure(struct dvb_pll_desc *desc, u8 *buf,
		      u32 freq, int bandwidth)
{
	u32 div;
	int i;

	if (freq != 0 && (freq < desc->min || freq > desc->max))
	    return -EINVAL;

	for (i = 0; i < desc->count; i++) {
		if (freq > desc->entries[i].limit)
			continue;
		break;
	}
	if (debug)
		printk("pll: %s: freq=%d bw=%d | i=%d/%d\n",
		       desc->name, freq, bandwidth, i, desc->count);
	if (i == desc->count)
		return -EINVAL;

	div = (freq + desc->entries[i].offset) / desc->entries[i].stepsize;
	buf[0] = div >> 8;
	buf[1] = div & 0xff;
	buf[2] = desc->entries[i].config;
	buf[3] = desc->entries[i].cb;

	if (desc->setbw)
		desc->setbw(buf, freq, bandwidth);

	if (debug)
		printk("pll: %s: div=%d | buf=0x%02x,0x%02x,0x%02x,0x%02x\n",
		       desc->name, div, buf[0], buf[1], buf[2], buf[3]);

	return 0;
}
EXPORT_SYMBOL(dvb_pll_configure);

static int dvb_pll_release(struct dvb_frontend *fe)
{
	if (fe->tuner_priv)
		kfree(fe->tuner_priv);
	fe->tuner_priv = NULL;
	return 0;
}

static int dvb_pll_sleep(struct dvb_frontend *fe)
{
	struct dvb_pll_priv *priv = fe->tuner_priv;
	u8 buf[4];
	struct i2c_msg msg =
		{ .addr = priv->pll_i2c_address, .flags = 0, .buf = buf, .len = sizeof(buf) };
	int i;
	int result;

	for (i = 0; i < priv->pll_desc->count; i++) {
		if (priv->pll_desc->entries[i].limit == 0)
			break;
	}
	if (i == priv->pll_desc->count)
		return 0;

	buf[0] = 0;
	buf[1] = 0;
	buf[2] = priv->pll_desc->entries[i].config;
	buf[3] = priv->pll_desc->entries[i].cb;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);
	if ((result = i2c_transfer(priv->i2c, &msg, 1)) != 1) {
		return result;
	}

	return 0;
}

static int dvb_pll_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params)
{
	struct dvb_pll_priv *priv = fe->tuner_priv;
	u8 buf[4];
	struct i2c_msg msg =
		{ .addr = priv->pll_i2c_address, .flags = 0, .buf = buf, .len = sizeof(buf) };
	int result;
	u32 div;
	int i;
	u32 bandwidth = 0;

	if (priv->i2c == NULL)
		return -EINVAL;

	// DVBT bandwidth only just now
	if (fe->ops.info.type == FE_OFDM) {
		bandwidth = params->u.ofdm.bandwidth;
	}

	if ((result = dvb_pll_configure(priv->pll_desc, buf, params->frequency, bandwidth)) != 0)
		return result;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);
	if ((result = i2c_transfer(priv->i2c, &msg, 1)) != 1) {
		return result;
	}

	// calculate the frequency we set it to
	for (i = 0; i < priv->pll_desc->count; i++) {
		if (params->frequency > priv->pll_desc->entries[i].limit)
			continue;
		break;
	}
	div = (params->frequency + priv->pll_desc->entries[i].offset) / priv->pll_desc->entries[i].stepsize;
	priv->frequency = (div * priv->pll_desc->entries[i].stepsize) - priv->pll_desc->entries[i].offset;
	priv->bandwidth = bandwidth;

	return 0;
}

static int dvb_pll_calc_regs(struct dvb_frontend *fe, struct dvb_frontend_parameters *params, u8 *buf, int buf_len)
{
	struct dvb_pll_priv *priv = fe->tuner_priv;
	int result;
	u32 div;
	int i;
	u32 bandwidth = 0;

	if (buf_len < 5)
		return -EINVAL;

	// DVBT bandwidth only just now
	if (fe->ops.info.type == FE_OFDM) {
		bandwidth = params->u.ofdm.bandwidth;
	}

	if ((result = dvb_pll_configure(priv->pll_desc, buf+1, params->frequency, bandwidth)) != 0)
		return result;
	buf[0] = priv->pll_i2c_address;

	// calculate the frequency we set it to
	for (i = 0; i < priv->pll_desc->count; i++) {
		if (params->frequency > priv->pll_desc->entries[i].limit)
			continue;
		break;
	}
	div = (params->frequency + priv->pll_desc->entries[i].offset) / priv->pll_desc->entries[i].stepsize;
	priv->frequency = (div * priv->pll_desc->entries[i].stepsize) - priv->pll_desc->entries[i].offset;
	priv->bandwidth = bandwidth;

	return 5;
}

static int dvb_pll_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	struct dvb_pll_priv *priv = fe->tuner_priv;
	*frequency = priv->frequency;
	return 0;
}

static int dvb_pll_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
{
	struct dvb_pll_priv *priv = fe->tuner_priv;
	*bandwidth = priv->bandwidth;
	return 0;
}

static struct dvb_tuner_ops dvb_pll_tuner_ops = {
	.release = dvb_pll_release,
	.sleep = dvb_pll_sleep,
	.set_params = dvb_pll_set_params,
	.calc_regs = dvb_pll_calc_regs,
	.get_frequency = dvb_pll_get_frequency,
	.get_bandwidth = dvb_pll_get_bandwidth,
};

int dvb_pll_attach(struct dvb_frontend *fe, int pll_addr, struct i2c_adapter *i2c, struct dvb_pll_desc *desc)
{
	u8 b1 [] = { 0 };
	struct i2c_msg msg [] = { { .addr = pll_addr, .flags = 0, .buf = NULL, .len = 0 },
				  { .addr = pll_addr, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
	struct dvb_pll_priv *priv = NULL;
	int ret;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);

	ret = i2c_transfer (i2c, msg, 2);
	if (ret != 2)
		return -1;
	if (fe->ops.i2c_gate_ctrl)
		     fe->ops.i2c_gate_ctrl(fe, 0);

	priv = kzalloc(sizeof(struct dvb_pll_priv), GFP_KERNEL);
	if (priv == NULL)
		return -ENOMEM;

	priv->pll_i2c_address = pll_addr;
	priv->i2c = i2c;
	priv->pll_desc = desc;

	memcpy(&fe->ops.tuner_ops, &dvb_pll_tuner_ops, sizeof(struct dvb_tuner_ops));
	strncpy(fe->ops.tuner_ops.info.name, desc->name, 128);
	fe->ops.tuner_ops.info.frequency_min = desc->min;
	fe->ops.tuner_ops.info.frequency_min = desc->max;

	fe->tuner_priv = priv;
	return 0;
}
EXPORT_SYMBOL(dvb_pll_attach);

MODULE_DESCRIPTION("dvb pll library");
MODULE_AUTHOR("Gerd Knorr");
MODULE_LICENSE("GPL");