aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/media/dvb/frontends/mt312.c
blob: 176a22e3441bfeb5bd6bbf040214c5be1b6fb8b4 (plain) (tree)
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
























































































































































































































































































































































































































































































































































































































































































































































                                                                                                                              
/*
    Driver for Zarlink VP310/MT312 Satellite Channel Decoder

    Copyright (C) 2003 Andreas Oberritter <obi@linuxtv.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.

    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.

    References:
    http://products.zarlink.com/product_profiles/MT312.htm
    http://products.zarlink.com/product_profiles/SL1935.htm
*/

#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>

#include "dvb_frontend.h"
#include "mt312_priv.h"
#include "mt312.h"


struct mt312_state {
	struct i2c_adapter* i2c;
	struct dvb_frontend_ops ops;
	/* configuration settings */
	const struct mt312_config* config;
	struct dvb_frontend frontend;

	u8 id;
	u8 frequency;
};

static int debug;
#define dprintk(args...) \
	do { \
		if (debug) printk(KERN_DEBUG "mt312: " args); \
	} while (0)

#define MT312_SYS_CLK		90000000UL	/* 90 MHz */
#define MT312_LPOWER_SYS_CLK	60000000UL	/* 60 MHz */
#define MT312_PLL_CLK		10000000UL	/* 10 MHz */

static int mt312_read(struct mt312_state* state, const enum mt312_reg_addr reg,
		      void *buf, const size_t count)
{
	int ret;
	struct i2c_msg msg[2];
	u8 regbuf[1] = { reg };

	msg[0].addr = state->config->demod_address;
	msg[0].flags = 0;
	msg[0].buf = regbuf;
	msg[0].len = 1;
	msg[1].addr = state->config->demod_address;
	msg[1].flags = I2C_M_RD;
	msg[1].buf = buf;
	msg[1].len = count;

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

	if (ret != 2) {
		printk(KERN_ERR "%s: ret == %d\n", __FUNCTION__, ret);
		return -EREMOTEIO;
	}

	if(debug) {
		int i;
		dprintk("R(%d):", reg & 0x7f);
		for (i = 0; i < count; i++)
			printk(" %02x", ((const u8 *) buf)[i]);
		printk("\n");
	}

	return 0;
}

static int mt312_write(struct mt312_state* state, const enum mt312_reg_addr reg,
		       const void *src, const size_t count)
{
	int ret;
	u8 buf[count + 1];
	struct i2c_msg msg;

	if(debug) {
		int i;
		dprintk("W(%d):", reg & 0x7f);
		for (i = 0; i < count; i++)
			printk(" %02x", ((const u8 *) src)[i]);
		printk("\n");
	}

	buf[0] = reg;
	memcpy(&buf[1], src, count);

	msg.addr = state->config->demod_address;
	msg.flags = 0;
	msg.buf = buf;
	msg.len = count + 1;

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

	if (ret != 1) {
		dprintk("%s: ret == %d\n", __FUNCTION__, ret);
		return -EREMOTEIO;
	}

	return 0;
}

static inline int mt312_readreg(struct mt312_state* state,
				const enum mt312_reg_addr reg, u8 *val)
{
	return mt312_read(state, reg, val, 1);
}

static inline int mt312_writereg(struct mt312_state* state,
				 const enum mt312_reg_addr reg, const u8 val)
{
	return mt312_write(state, reg, &val, 1);
}

static inline u32 mt312_div(u32 a, u32 b)
{
	return (a + (b / 2)) / b;
}

static int mt312_reset(struct mt312_state* state, const u8 full)
{
	return mt312_writereg(state, RESET, full ? 0x80 : 0x40);
}

static int mt312_get_inversion(struct mt312_state* state,
			       fe_spectral_inversion_t *i)
{
	int ret;
	u8 vit_mode;

	if ((ret = mt312_readreg(state, VIT_MODE, &vit_mode)) < 0)
		return ret;

	if (vit_mode & 0x80)	/* auto inversion was used */
		*i = (vit_mode & 0x40) ? INVERSION_ON : INVERSION_OFF;

	return 0;
}

static int mt312_get_symbol_rate(struct mt312_state* state, u32 *sr)
{
	int ret;
	u8 sym_rate_h;
	u8 dec_ratio;
	u16 sym_rat_op;
	u16 monitor;
	u8 buf[2];

	if ((ret = mt312_readreg(state, SYM_RATE_H, &sym_rate_h)) < 0)
		return ret;

	if (sym_rate_h & 0x80) {	/* symbol rate search was used */
		if ((ret = mt312_writereg(state, MON_CTRL, 0x03)) < 0)
			return ret;

		if ((ret = mt312_read(state, MONITOR_H, buf, sizeof(buf))) < 0)
			return ret;

		monitor = (buf[0] << 8) | buf[1];

		dprintk(KERN_DEBUG "sr(auto) = %u\n",
		       mt312_div(monitor * 15625, 4));
	} else {
		if ((ret = mt312_writereg(state, MON_CTRL, 0x05)) < 0)
			return ret;

		if ((ret = mt312_read(state, MONITOR_H, buf, sizeof(buf))) < 0)
			return ret;

		dec_ratio = ((buf[0] >> 5) & 0x07) * 32;

		if ((ret = mt312_read(state, SYM_RAT_OP_H, buf, sizeof(buf))) < 0)
			return ret;

		sym_rat_op = (buf[0] << 8) | buf[1];

		dprintk(KERN_DEBUG "sym_rat_op=%d dec_ratio=%d\n",
		       sym_rat_op, dec_ratio);
		dprintk(KERN_DEBUG "*sr(manual) = %lu\n",
		       (((MT312_PLL_CLK * 8192) / (sym_rat_op + 8192)) *
			2) - dec_ratio);
	}

	return 0;
}

static int mt312_get_code_rate(struct mt312_state* state, fe_code_rate_t *cr)
{
	const fe_code_rate_t fec_tab[8] =
	    { FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_6_7, FEC_7_8,
		FEC_AUTO, FEC_AUTO };

	int ret;
	u8 fec_status;

	if ((ret = mt312_readreg(state, FEC_STATUS, &fec_status)) < 0)
		return ret;

	*cr = fec_tab[(fec_status >> 4) & 0x07];

	return 0;
}

static int mt312_initfe(struct dvb_frontend* fe)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	int ret;
	u8 buf[2];

	/* wake up */
	if ((ret = mt312_writereg(state, CONFIG, (state->frequency == 60 ? 0x88 : 0x8c))) < 0)
		return ret;

	/* wait at least 150 usec */
	udelay(150);

	/* full reset */
	if ((ret = mt312_reset(state, 1)) < 0)
		return ret;

// Per datasheet, write correct values. 09/28/03 ACCJr.
// If we don't do this, we won't get FE_HAS_VITERBI in the VP310.
	{
		u8 buf_def[8]={0x14, 0x12, 0x03, 0x02, 0x01, 0x00, 0x00, 0x00};

		if ((ret = mt312_write(state, VIT_SETUP, buf_def, sizeof(buf_def))) < 0)
			return ret;
	}

	/* SYS_CLK */
	buf[0] = mt312_div((state->frequency == 60 ? MT312_LPOWER_SYS_CLK : MT312_SYS_CLK) * 2, 1000000);

	/* DISEQC_RATIO */
	buf[1] = mt312_div(MT312_PLL_CLK, 15000 * 4);

	if ((ret = mt312_write(state, SYS_CLK, buf, sizeof(buf))) < 0)
		return ret;

	if ((ret = mt312_writereg(state, SNR_THS_HIGH, 0x32)) < 0)
		return ret;

	if ((ret = mt312_writereg(state, OP_CTRL, 0x53)) < 0)
		return ret;

	/* TS_SW_LIM */
	buf[0] = 0x8c;
	buf[1] = 0x98;

	if ((ret = mt312_write(state, TS_SW_LIM_L, buf, sizeof(buf))) < 0)
		return ret;

	if ((ret = mt312_writereg(state, CS_SW_LIM, 0x69)) < 0)
		return ret;

	if (state->config->pll_init) {
		mt312_writereg(state, GPP_CTRL, 0x40);
		state->config->pll_init(fe);
		mt312_writereg(state, GPP_CTRL, 0x00);
	}

	return 0;
}

static int mt312_send_master_cmd(struct dvb_frontend* fe,
				 struct dvb_diseqc_master_cmd *c)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	int ret;
	u8 diseqc_mode;

	if ((c->msg_len == 0) || (c->msg_len > sizeof(c->msg)))
		return -EINVAL;

	if ((ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode)) < 0)
		return ret;

	if ((ret =
	     mt312_write(state, (0x80 | DISEQC_INSTR), c->msg, c->msg_len)) < 0)
		return ret;

	if ((ret =
	     mt312_writereg(state, DISEQC_MODE,
			    (diseqc_mode & 0x40) | ((c->msg_len - 1) << 3)
			    | 0x04)) < 0)
		return ret;

	/* set DISEQC_MODE[2:0] to zero if a return message is expected */
	if (c->msg[0] & 0x02)
		if ((ret =
		     mt312_writereg(state, DISEQC_MODE, (diseqc_mode & 0x40))) < 0)
			return ret;

	return 0;
}

static int mt312_send_burst(struct dvb_frontend* fe, const fe_sec_mini_cmd_t c)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	const u8 mini_tab[2] = { 0x02, 0x03 };

	int ret;
	u8 diseqc_mode;

	if (c > SEC_MINI_B)
		return -EINVAL;

	if ((ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode)) < 0)
		return ret;

	if ((ret =
	     mt312_writereg(state, DISEQC_MODE,
			    (diseqc_mode & 0x40) | mini_tab[c])) < 0)
		return ret;

	return 0;
}

static int mt312_set_tone(struct dvb_frontend* fe, const fe_sec_tone_mode_t t)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	const u8 tone_tab[2] = { 0x01, 0x00 };

	int ret;
	u8 diseqc_mode;

	if (t > SEC_TONE_OFF)
		return -EINVAL;

	if ((ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode)) < 0)
		return ret;

	if ((ret =
	     mt312_writereg(state, DISEQC_MODE,
			    (diseqc_mode & 0x40) | tone_tab[t])) < 0)
		return ret;

	return 0;
}

static int mt312_set_voltage(struct dvb_frontend* fe, const fe_sec_voltage_t v)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	const u8 volt_tab[3] = { 0x00, 0x40, 0x00 };

	if (v > SEC_VOLTAGE_OFF)
		return -EINVAL;

	return mt312_writereg(state, DISEQC_MODE, volt_tab[v]);
}

static int mt312_read_status(struct dvb_frontend* fe, fe_status_t *s)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	int ret;
	u8 status[3];

	*s = 0;

	if ((ret = mt312_read(state, QPSK_STAT_H, status, sizeof(status))) < 0)
		return ret;

	dprintk(KERN_DEBUG "QPSK_STAT_H: 0x%02x, QPSK_STAT_L: 0x%02x, FEC_STATUS: 0x%02x\n", status[0], status[1], status[2]);

	if (status[0] & 0xc0)
		*s |= FE_HAS_SIGNAL;	/* signal noise ratio */
	if (status[0] & 0x04)
		*s |= FE_HAS_CARRIER;	/* qpsk carrier lock */
	if (status[2] & 0x02)
		*s |= FE_HAS_VITERBI;	/* viterbi lock */
	if (status[2] & 0x04)
		*s |= FE_HAS_SYNC;	/* byte align lock */
	if (status[0] & 0x01)
		*s |= FE_HAS_LOCK;	/* qpsk lock */

	return 0;
}

static int mt312_read_ber(struct dvb_frontend* fe, u32 *ber)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	int ret;
	u8 buf[3];

	if ((ret = mt312_read(state, RS_BERCNT_H, buf, 3)) < 0)
		return ret;

	*ber = ((buf[0] << 16) | (buf[1] << 8) | buf[2]) * 64;

	return 0;
}

static int mt312_read_signal_strength(struct dvb_frontend* fe, u16 *signal_strength)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	int ret;
	u8 buf[3];
	u16 agc;
	s16 err_db;

	if ((ret = mt312_read(state, AGC_H, buf, sizeof(buf))) < 0)
		return ret;

	agc = (buf[0] << 6) | (buf[1] >> 2);
	err_db = (s16) (((buf[1] & 0x03) << 14) | buf[2] << 6) >> 6;

	*signal_strength = agc;

	dprintk(KERN_DEBUG "agc=%08x err_db=%hd\n", agc, err_db);

	return 0;
}

static int mt312_read_snr(struct dvb_frontend* fe, u16 *snr)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	int ret;
	u8 buf[2];

	if ((ret = mt312_read(state, M_SNR_H, &buf, sizeof(buf))) < 0)
		return ret;

	*snr = 0xFFFF - ((((buf[0] & 0x7f) << 8) | buf[1]) << 1);

	return 0;
}

static int mt312_read_ucblocks(struct dvb_frontend* fe, u32 *ubc)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	int ret;
	u8 buf[2];

	if ((ret = mt312_read(state, RS_UBC_H, &buf, sizeof(buf))) < 0)
		return ret;

	*ubc = (buf[0] << 8) | buf[1];

	return 0;
}

static int mt312_set_frontend(struct dvb_frontend* fe,
			      struct dvb_frontend_parameters *p)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	int ret;
	u8 buf[5], config_val;
	u16 sr;

	const u8 fec_tab[10] =
	    { 0x00, 0x01, 0x02, 0x04, 0x3f, 0x08, 0x10, 0x20, 0x3f, 0x3f };
	const u8 inv_tab[3] = { 0x00, 0x40, 0x80 };

	dprintk("%s: Freq %d\n", __FUNCTION__, p->frequency);

	if ((p->frequency < fe->ops->info.frequency_min)
	    || (p->frequency > fe->ops->info.frequency_max))
		return -EINVAL;

	if ((p->inversion < INVERSION_OFF)
	    || (p->inversion > INVERSION_ON))
		return -EINVAL;

	if ((p->u.qpsk.symbol_rate < fe->ops->info.symbol_rate_min)
	    || (p->u.qpsk.symbol_rate > fe->ops->info.symbol_rate_max))
		return -EINVAL;

	if ((p->u.qpsk.fec_inner < FEC_NONE)
	    || (p->u.qpsk.fec_inner > FEC_AUTO))
		return -EINVAL;

	if ((p->u.qpsk.fec_inner == FEC_4_5)
	    || (p->u.qpsk.fec_inner == FEC_8_9))
		return -EINVAL;

	switch (state->id) {
	case ID_VP310:
	// For now we will do this only for the VP310.
	// It should be better for the mt312 as well, but tunning will be slower. ACCJr 09/29/03
		if ((ret = mt312_readreg(state, CONFIG, &config_val) < 0))
			return ret;
		if (p->u.qpsk.symbol_rate >= 30000000) //Note that 30MS/s should use 90MHz
		{
			if ((config_val & 0x0c) == 0x08) { //We are running 60MHz
				state->frequency = 90;
				if ((ret = mt312_initfe(fe)) < 0)
					return ret;
			}
		}
		else
		{
			if ((config_val & 0x0c) == 0x0C) { //We are running 90MHz
				state->frequency = 60;
				if ((ret = mt312_initfe(fe)) < 0)
					return ret;
			}
		}
		break;

	case ID_MT312:
		break;

	default:
		return -EINVAL;
	}

	mt312_writereg(state, GPP_CTRL, 0x40);
	state->config->pll_set(fe, p);
	mt312_writereg(state, GPP_CTRL, 0x00);

	/* sr = (u16)(sr * 256.0 / 1000000.0) */
	sr = mt312_div(p->u.qpsk.symbol_rate * 4, 15625);

	/* SYM_RATE */
	buf[0] = (sr >> 8) & 0x3f;
	buf[1] = (sr >> 0) & 0xff;

	/* VIT_MODE */
	buf[2] = inv_tab[p->inversion] | fec_tab[p->u.qpsk.fec_inner];

	/* QPSK_CTRL */
	buf[3] = 0x40;		/* swap I and Q before QPSK demodulation */

	if (p->u.qpsk.symbol_rate < 10000000)
		buf[3] |= 0x04;	/* use afc mode */

	/* GO */
	buf[4] = 0x01;

	if ((ret = mt312_write(state, SYM_RATE_H, buf, sizeof(buf))) < 0)
		return ret;

        mt312_reset(state, 0);

	return 0;
}

static int mt312_get_frontend(struct dvb_frontend* fe,
			      struct dvb_frontend_parameters *p)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	int ret;

	if ((ret = mt312_get_inversion(state, &p->inversion)) < 0)
		return ret;

	if ((ret = mt312_get_symbol_rate(state, &p->u.qpsk.symbol_rate)) < 0)
		return ret;

	if ((ret = mt312_get_code_rate(state, &p->u.qpsk.fec_inner)) < 0)
		return ret;

	return 0;
}

static int mt312_sleep(struct dvb_frontend* fe)
{
	struct mt312_state *state = (struct mt312_state*) fe->demodulator_priv;
	int ret;
	u8 config;

	/* reset all registers to defaults */
	if ((ret = mt312_reset(state, 1)) < 0)
		return ret;

	if ((ret = mt312_readreg(state, CONFIG, &config)) < 0)
		return ret;

	/* enter standby */
	if ((ret = mt312_writereg(state, CONFIG, config & 0x7f)) < 0)
		return ret;

	return 0;
}

static int mt312_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
{
	fesettings->min_delay_ms = 50;
	fesettings->step_size = 0;
	fesettings->max_drift = 0;
	return 0;
}

static void mt312_release(struct dvb_frontend* fe)
{
	struct mt312_state* state = (struct mt312_state*) fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops vp310_mt312_ops;

struct dvb_frontend* vp310_attach(const struct mt312_config* config,
				  struct i2c_adapter* i2c)
{
	struct mt312_state* state = NULL;

	/* allocate memory for the internal state */
	state = (struct mt312_state*) kmalloc(sizeof(struct mt312_state), GFP_KERNEL);
	if (state == NULL)
		goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;
	memcpy(&state->ops, &vp310_mt312_ops, sizeof(struct dvb_frontend_ops));
	strcpy(state->ops.info.name, "Zarlink VP310 DVB-S");

	/* check if the demod is there */
	if (mt312_readreg(state, ID, &state->id) < 0)
		goto error;
	if (state->id != ID_VP310) {
		goto error;
	}

	/* create dvb_frontend */
	state->frequency = 90;
	state->frontend.ops = &state->ops;
	state->frontend.demodulator_priv = state;
	return &state->frontend;

error:
	kfree(state);
	return NULL;
}

struct dvb_frontend* mt312_attach(const struct mt312_config* config,
				  struct i2c_adapter* i2c)
{
	struct mt312_state* state = NULL;

	/* allocate memory for the internal state */
	state = (struct mt312_state*) kmalloc(sizeof(struct mt312_state), GFP_KERNEL);
	if (state == NULL)
		goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;
	memcpy(&state->ops, &vp310_mt312_ops, sizeof(struct dvb_frontend_ops));
	strcpy(state->ops.info.name, "Zarlink MT312 DVB-S");

	/* check if the demod is there */
	if (mt312_readreg(state, ID, &state->id) < 0)
		goto error;
	if (state->id != ID_MT312) {
		goto error;
	}

	/* create dvb_frontend */
	state->frequency = 60;
	state->frontend.ops = &state->ops;
	state->frontend.demodulator_priv = state;
	return &state->frontend;

error:
	if (state)
		kfree(state);
	return NULL;
}

static struct dvb_frontend_ops vp310_mt312_ops = {

	.info = {
		.name = "Zarlink ???? DVB-S",
		.type = FE_QPSK,
		.frequency_min = 950000,
		.frequency_max = 2150000,
		.frequency_stepsize = (MT312_PLL_CLK / 1000) / 128,
		.symbol_rate_min = MT312_SYS_CLK / 128,
		.symbol_rate_max = MT312_SYS_CLK / 2,
		.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_MUTE_TS |
	            FE_CAN_RECOVER
	},

	.release = mt312_release,

	.init = mt312_initfe,
	.sleep = mt312_sleep,

	.set_frontend = mt312_set_frontend,
	.get_frontend = mt312_get_frontend,
	.get_tune_settings = mt312_get_tune_settings,

	.read_status = mt312_read_status,
	.read_ber = mt312_read_ber,
	.read_signal_strength = mt312_read_signal_strength,
	.read_snr = mt312_read_snr,
	.read_ucblocks = mt312_read_ucblocks,

	.diseqc_send_master_cmd = mt312_send_master_cmd,
	.diseqc_send_burst = mt312_send_burst,
	.set_tone = mt312_set_tone,
	.set_voltage = mt312_set_voltage,
};

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

MODULE_DESCRIPTION("Zarlink VP310/MT312 DVB-S Demodulator driver");
MODULE_AUTHOR("Andreas Oberritter <obi@linuxtv.org>");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(mt312_attach);
EXPORT_SYMBOL(vp310_attach);