aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb/frontends/au8522.c
blob: 0b82cc2a1e161c7603e900ab6bff8d4ffc9effee (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
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
/*
    Auvitek AU8522 QAM/8VSB demodulator driver

    Copyright (C) 2008 Steven Toth <stoth@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.

*/

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include "dvb_frontend.h"
#include "au8522.h"

struct au8522_state {

	struct i2c_adapter *i2c;

	/* configuration settings */
	const struct au8522_config *config;

	struct dvb_frontend frontend;

	u32 current_frequency;
	fe_modulation_t current_modulation;

};

static int debug;

#define dprintk(arg...) do {		\
	if (debug) 			\
		 printk(arg); 		\
	} while (0)

/* 16 bit registers, 8 bit values */
static int au8522_writereg(struct au8522_state *state, u16 reg, u8 data)
{
	int ret;
	u8 buf [] = { reg >> 8, reg & 0xff, data };

	struct i2c_msg msg = { .addr = state->config->demod_address,
			       .flags = 0, .buf = buf, .len = 3 };

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

	if (ret != 1)
		printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, "
		       "ret == %i)\n", __func__, reg, data, ret);

	return (ret != 1) ? -1 : 0;
}

static u8 au8522_readreg(struct au8522_state *state, u16 reg)
{
	int ret;
	u8 b0 [] = { reg >> 8, reg & 0xff };
	u8 b1 [] = { 0 };

	struct i2c_msg msg [] = {
		{ .addr = state->config->demod_address, .flags = 0,
		  .buf = b0, .len = 2 },
		{ .addr = state->config->demod_address, .flags = I2C_M_RD,
		  .buf = b1, .len = 1 } };

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

	if (ret != 2)
		printk(KERN_ERR "%s: readreg error (ret == %i)\n",
		       __func__, ret);
	return b1[0];
}

static int au8522_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
{
	struct au8522_state *state = fe->demodulator_priv;

	dprintk("%s(%d)\n", __func__, enable);

	if (enable)
		return au8522_writereg(state, 0x106, 1);
	else
		return au8522_writereg(state, 0x106, 0);
}

struct mse2snr_tab {
	u16 val;
	u16 data;
};

/* VSB SNR lookup table */
static struct mse2snr_tab vsb_mse2snr_tab[] = {
	{   0, 270 },
	{   2, 250 },
	{   3, 240 },
	{   5, 230 },
	{   7, 220 },
	{   9, 210 },
	{  12, 200 },
	{  13, 195 },
	{  15, 190 },
	{  17, 185 },
	{  19, 180 },
	{  21, 175 },
	{  24, 170 },
	{  27, 165 },
	{  31, 160 },
	{  32, 158 },
	{  33, 156 },
	{  36, 152 },
	{  37, 150 },
	{  39, 148 },
	{  40, 146 },
	{  41, 144 },
	{  43, 142 },
	{  44, 140 },
	{  48, 135 },
	{  50, 130 },
	{  43, 142 },
	{  53, 125 },
	{  56, 120 },
	{ 256, 115 },
};

/* QAM64 SNR lookup table */
static struct mse2snr_tab qam64_mse2snr_tab[] = {
	{  15,   0 },
	{  16, 290 },
	{  17, 288 },
	{  18, 286 },
	{  19, 284 },
	{  20, 282 },
	{  21, 281 },
	{  22, 279 },
	{  23, 277 },
	{  24, 275 },
	{  25, 273 },
	{  26, 271 },
	{  27, 269 },
	{  28, 268 },
	{  29, 266 },
	{  30, 264 },
	{  31, 262 },
	{  32, 260 },
	{  33, 259 },
	{  34, 258 },
	{  35, 256 },
	{  36, 255 },
	{  37, 254 },
	{  38, 252 },
	{  39, 251 },
	{  40, 250 },
	{  41, 249 },
	{  42, 248 },
	{  43, 246 },
	{  44, 245 },
	{  45, 244 },
	{  46, 242 },
	{  47, 241 },
	{  48, 240 },
	{  50, 239 },
	{  51, 238 },
	{  53, 237 },
	{  54, 236 },
	{  56, 235 },
	{  57, 234 },
	{  59, 233 },
	{  60, 232 },
	{  62, 231 },
	{  63, 230 },
	{  65, 229 },
	{  67, 228 },
	{  68, 227 },
	{  70, 226 },
	{  71, 225 },
	{  73, 224 },
	{  74, 223 },
	{  76, 222 },
	{  78, 221 },
	{  80, 220 },
	{  82, 219 },
	{  85, 218 },
	{  88, 217 },
	{  90, 216 },
	{  92, 215 },
	{  93, 214 },
	{  94, 212 },
	{  95, 211 },
	{  97, 210 },
	{  99, 209 },
	{ 101, 208 },
	{ 102, 207 },
	{ 104, 206 },
	{ 107, 205 },
	{ 111, 204 },
	{ 114, 203 },
	{ 118, 202 },
	{ 122, 201 },
	{ 125, 200 },
	{ 128, 199 },
	{ 130, 198 },
	{ 132, 197 },
	{ 256, 190 },
};

/* QAM256 SNR lookup table */
static struct mse2snr_tab qam256_mse2snr_tab[] = {
	{  16,   0 },
	{  17, 400 },
	{  18, 398 },
	{  19, 396 },
	{  20, 394 },
	{  21, 392 },
	{  22, 390 },
	{  23, 388 },
	{  24, 386 },
	{  25, 384 },
	{  26, 382 },
	{  27, 380 },
	{  28, 379 },
	{  29, 378 },
	{  30, 377 },
	{  31, 376 },
	{  32, 375 },
	{  33, 374 },
	{  34, 373 },
	{  35, 372 },
	{  36, 371 },
	{  37, 370 },
	{  38, 362 },
	{  39, 354 },
	{  40, 346 },
	{  41, 338 },
	{  42, 330 },
	{  43, 328 },
	{  44, 326 },
	{  45, 324 },
	{  46, 322 },
	{  47, 320 },
	{  48, 319 },
	{  49, 318 },
	{  50, 317 },
	{  51, 316 },
	{  52, 315 },
	{  53, 314 },
	{  54, 313 },
	{  55, 312 },
	{  56, 311 },
	{  57, 310 },
	{  58, 308 },
	{  59, 306 },
	{  60, 304 },
	{  61, 302 },
	{  62, 300 },
	{  63, 298 },
	{  65, 295 },
	{  68, 294 },
	{  70, 293 },
	{  73, 292 },
	{  76, 291 },
	{  78, 290 },
	{  79, 289 },
	{  81, 288 },
	{  82, 287 },
	{  83, 286 },
	{  84, 285 },
	{  85, 284 },
	{  86, 283 },
	{  88, 282 },
	{  89, 281 },
	{ 256, 280 },
};

static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
				 u16 *snr)
{
	int i, ret = -EINVAL;
	dprintk("%s()\n", __func__);

	for (i = 0; i < sz; i++) {
		if (mse < tab[i].val) {
			*snr = tab[i].data;
			ret = 0;
			break;
		}
	}
	dprintk("%s() snr=%d\n", __func__, *snr);
	return ret;
}

static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
{
	struct au8522_state *state = fe->demodulator_priv;
	u8 r0b5, r0b6, r0b7;
	char *ifmhz;

	switch (if_freq) {
	case AU8522_IF_3_25MHZ:
		ifmhz = "3.25";
		r0b5 = 0x00;
		r0b6 = 0x3d;
		r0b7 = 0xa0;
		break;
	case AU8522_IF_4MHZ:
		ifmhz = "4.00";
		r0b5 = 0x00;
		r0b6 = 0x4b;
		r0b7 = 0xd9;
		break;
	case AU8522_IF_6MHZ:
		ifmhz = "6.00";
		r0b5 = 0xfb;
		r0b6 = 0x8e;
		r0b7 = 0x39;
		break;
	default:
		dprintk("%s() IF Frequency not supported\n", __func__);
		return -EINVAL;
	}
	dprintk("%s() %s MHz\n", __func__, ifmhz);
	au8522_writereg(state, 0x80b5, r0b5);
	au8522_writereg(state, 0x80b6, r0b6);
	au8522_writereg(state, 0x80b7, r0b7);

	return 0;
}

/* VSB Modulation table */
static struct {
	u16 reg;
	u16 data;
} VSB_mod_tab[] = {
	{ 0x8090, 0x84 },
	{ 0x4092, 0x11 },
	{ 0x2005, 0x00 },
	{ 0x8091, 0x80 },
	{ 0x80a3, 0x0c },
	{ 0x80a4, 0xe8 },
	{ 0x8081, 0xc4 },
	{ 0x80a5, 0x40 },
	{ 0x80a7, 0x40 },
	{ 0x80a6, 0x67 },
	{ 0x8262, 0x20 },
	{ 0x821c, 0x30 },
	{ 0x80d8, 0x1a },
	{ 0x8227, 0xa0 },
	{ 0x8121, 0xff },
	{ 0x80a8, 0xf0 },
	{ 0x80a9, 0x05 },
	{ 0x80aa, 0x77 },
	{ 0x80ab, 0xf0 },
	{ 0x80ac, 0x05 },
	{ 0x80ad, 0x77 },
	{ 0x80ae, 0x41 },
	{ 0x80af, 0x66 },
	{ 0x821b, 0xcc },
	{ 0x821d, 0x80 },
	{ 0x80a4, 0xe8 },
	{ 0x8231, 0x13 },
};

/* QAM Modulation table */
static struct {
	u16 reg;
	u16 data;
} QAM_mod_tab[] = {
	{ 0x80a3, 0x09 },
	{ 0x80a4, 0x00 },
	{ 0x8081, 0xc4 },
	{ 0x80a5, 0x40 },
	{ 0x80aa, 0x77 },
	{ 0x80ad, 0x77 },
	{ 0x80a6, 0x67 },
	{ 0x8262, 0x20 },
	{ 0x821c, 0x30 },
	{ 0x80b8, 0x3e },
	{ 0x80b9, 0xf0 },
	{ 0x80ba, 0x01 },
	{ 0x80bb, 0x18 },
	{ 0x80bc, 0x50 },
	{ 0x80bd, 0x00 },
	{ 0x80be, 0xea },
	{ 0x80bf, 0xef },
	{ 0x80c0, 0xfc },
	{ 0x80c1, 0xbd },
	{ 0x80c2, 0x1f },
	{ 0x80c3, 0xfc },
	{ 0x80c4, 0xdd },
	{ 0x80c5, 0xaf },
	{ 0x80c6, 0x00 },
	{ 0x80c7, 0x38 },
	{ 0x80c8, 0x30 },
	{ 0x80c9, 0x05 },
	{ 0x80ca, 0x4a },
	{ 0x80cb, 0xd0 },
	{ 0x80cc, 0x01 },
	{ 0x80cd, 0xd9 },
	{ 0x80ce, 0x6f },
	{ 0x80cf, 0xf9 },
	{ 0x80d0, 0x70 },
	{ 0x80d1, 0xdf },
	{ 0x80d2, 0xf7 },
	{ 0x80d3, 0xc2 },
	{ 0x80d4, 0xdf },
	{ 0x80d5, 0x02 },
	{ 0x80d6, 0x9a },
	{ 0x80d7, 0xd0 },
	{ 0x8250, 0x0d },
	{ 0x8251, 0xcd },
	{ 0x8252, 0xe0 },
	{ 0x8253, 0x05 },
	{ 0x8254, 0xa7 },
	{ 0x8255, 0xff },
	{ 0x8256, 0xed },
	{ 0x8257, 0x5b },
	{ 0x8258, 0xae },
	{ 0x8259, 0xe6 },
	{ 0x825a, 0x3d },
	{ 0x825b, 0x0f },
	{ 0x825c, 0x0d },
	{ 0x825d, 0xea },
	{ 0x825e, 0xf2 },
	{ 0x825f, 0x51 },
	{ 0x8260, 0xf5 },
	{ 0x8261, 0x06 },
	{ 0x821a, 0x00 },
	{ 0x8546, 0x40 },
	{ 0x8210, 0x26 },
	{ 0x8211, 0xf6 },
	{ 0x8212, 0x84 },
	{ 0x8213, 0x02 },
	{ 0x8502, 0x01 },
	{ 0x8121, 0x04 },
	{ 0x8122, 0x04 },
	{ 0x852e, 0x10 },
	{ 0x80a4, 0xca },
	{ 0x80a7, 0x40 },
	{ 0x8526, 0x01 },
};

static int au8522_enable_modulation(struct dvb_frontend *fe,
				    fe_modulation_t m)
{
	struct au8522_state *state = fe->demodulator_priv;
	int i;

	dprintk("%s(0x%08x)\n", __func__, m);

	switch (m) {
	case VSB_8:
		dprintk("%s() VSB_8\n", __func__);
		for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
			au8522_writereg(state,
				VSB_mod_tab[i].reg,
				VSB_mod_tab[i].data);
		au8522_set_if(fe, state->config->vsb_if);
		break;
	case QAM_64:
	case QAM_256:
		dprintk("%s() QAM 64/256\n", __func__);
		for (i = 0; i < ARRAY_SIZE(QAM_mod_tab); i++)
			au8522_writereg(state,
				QAM_mod_tab[i].reg,
				QAM_mod_tab[i].data);
		au8522_set_if(fe, state->config->qam_if);
		break;
	default:
		dprintk("%s() Invalid modulation\n", __func__);
		return -EINVAL;
	}

	state->current_modulation = m;

	return 0;
}

/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
static int au8522_set_frontend(struct dvb_frontend *fe,
			       struct dvb_frontend_parameters *p)
{
	struct au8522_state *state = fe->demodulator_priv;
	int ret = -EINVAL;

	dprintk("%s(frequency=%d)\n", __func__, p->frequency);

	if ((state->current_frequency == p->frequency) &&
	    (state->current_modulation == p->u.vsb.modulation))
		return 0;

	au8522_enable_modulation(fe, p->u.vsb.modulation);

	/* Allow the demod to settle */
	msleep(100);

	if (fe->ops.tuner_ops.set_params) {
		if (fe->ops.i2c_gate_ctrl)
			fe->ops.i2c_gate_ctrl(fe, 1);
		ret = fe->ops.tuner_ops.set_params(fe, p);
		if (fe->ops.i2c_gate_ctrl)
			fe->ops.i2c_gate_ctrl(fe, 0);
	}

	if (ret < 0)
		return ret;

	state->current_frequency = p->frequency;

	return 0;
}

/* Reset the demod hardware and reset all of the configuration registers
   to a default state. */
static int au8522_init(struct dvb_frontend *fe)
{
	struct au8522_state *state = fe->demodulator_priv;
	dprintk("%s()\n", __func__);

	au8522_writereg(state, 0xa4, 1 << 5);

	au8522_i2c_gate_ctrl(fe, 1);

	return 0;
}

static int au8522_sleep(struct dvb_frontend *fe)
{
	struct au8522_state *state = fe->demodulator_priv;
	dprintk("%s()\n", __func__);

	state->current_frequency = 0;

	return 0;
}

static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
	struct au8522_state *state = fe->demodulator_priv;
	u8 reg;
	u32 tuner_status = 0;

	*status = 0;

	if (state->current_modulation == VSB_8) {
		dprintk("%s() Checking VSB_8\n", __func__);
		reg = au8522_readreg(state, 0x4088);
		if ((reg & 0x03) == 0x03)
			*status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
	} else {
		dprintk("%s() Checking QAM\n", __func__);
		reg = au8522_readreg(state, 0x4541);
		if (reg & 0x80)
			*status |= FE_HAS_VITERBI;
		if (reg & 0x20)
			*status |= FE_HAS_LOCK | FE_HAS_SYNC;
	}

	switch (state->config->status_mode) {
	case AU8522_DEMODLOCKING:
		dprintk("%s() DEMODLOCKING\n", __func__);
		if (*status & FE_HAS_VITERBI)
			*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
		break;
	case AU8522_TUNERLOCKING:
		/* Get the tuner status */
		dprintk("%s() TUNERLOCKING\n", __func__);
		if (fe->ops.tuner_ops.get_status) {
			if (fe->ops.i2c_gate_ctrl)
				fe->ops.i2c_gate_ctrl(fe, 1);

			fe->ops.tuner_ops.get_status(fe, &tuner_status);

			if (fe->ops.i2c_gate_ctrl)
				fe->ops.i2c_gate_ctrl(fe, 0);
		}
		if (tuner_status)
			*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
		break;
	}

	dprintk("%s() status 0x%08x\n", __func__, *status);

	return 0;
}

static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
{
	struct au8522_state *state = fe->demodulator_priv;
	int ret = -EINVAL;

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

	if (state->current_modulation == QAM_256)
		ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
					    ARRAY_SIZE(qam256_mse2snr_tab),
					    au8522_readreg(state, 0x4522),
					    snr);
	else if (state->current_modulation == QAM_64)
		ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
					    ARRAY_SIZE(qam64_mse2snr_tab),
					    au8522_readreg(state, 0x4522),
					    snr);
	else /* VSB_8 */
		ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
					    ARRAY_SIZE(vsb_mse2snr_tab),
					    au8522_readreg(state, 0x4311),
					    snr);

	return ret;
}

static int au8522_read_signal_strength(struct dvb_frontend *fe,
				       u16 *signal_strength)
{
	return au8522_read_snr(fe, signal_strength);
}

static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
	struct au8522_state *state = fe->demodulator_priv;

	if (state->current_modulation == VSB_8)
		*ucblocks = au8522_readreg(state, 0x4087);
	else
		*ucblocks = au8522_readreg(state, 0x4543);

	return 0;
}

static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
{
	return au8522_read_ucblocks(fe, ber);
}

static int au8522_get_frontend(struct dvb_frontend *fe,
				struct dvb_frontend_parameters *p)
{
	struct au8522_state *state = fe->demodulator_priv;

	p->frequency = state->current_frequency;
	p->u.vsb.modulation = state->current_modulation;

	return 0;
}

static int au8522_get_tune_settings(struct dvb_frontend *fe,
				    struct dvb_frontend_tune_settings *tune)
{
	tune->min_delay_ms = 1000;
	return 0;
}

static void au8522_release(struct dvb_frontend *fe)
{
	struct au8522_state *state = fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops au8522_ops;

struct dvb_frontend *au8522_attach(const struct au8522_config *config,
				   struct i2c_adapter *i2c)
{
	struct au8522_state *state = NULL;

	/* allocate memory for the internal state */
	state = kmalloc(sizeof(struct au8522_state), GFP_KERNEL);
	if (state == NULL)
		goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;
	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &au8522_ops,
	       sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;

	if (au8522_init(&state->frontend) != 0) {
		printk(KERN_ERR "%s: Failed to initialize correctly\n",
			__func__);
		goto error;
	}

	/* Note: Leaving the I2C gate open here. */
	au8522_i2c_gate_ctrl(&state->frontend, 1);

	return &state->frontend;

error:
	kfree(state);
	return NULL;
}
EXPORT_SYMBOL(au8522_attach);

static struct dvb_frontend_ops au8522_ops = {

	.info = {
		.name			= "Auvitek AU8522 QAM/8VSB Frontend",
		.type			= FE_ATSC,
		.frequency_min		= 54000000,
		.frequency_max		= 858000000,
		.frequency_stepsize	= 62500,
		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
	},

	.init                 = au8522_init,
	.sleep                = au8522_sleep,
	.i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
	.set_frontend         = au8522_set_frontend,
	.get_frontend         = au8522_get_frontend,
	.get_tune_settings    = au8522_get_tune_settings,
	.read_status          = au8522_read_status,
	.read_ber             = au8522_read_ber,
	.read_signal_strength = au8522_read_signal_strength,
	.read_snr             = au8522_read_snr,
	.read_ucblocks        = au8522_read_ucblocks,
	.release              = au8522_release,
};

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Enable verbose debug messages");

MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
MODULE_AUTHOR("Steven Toth");
MODULE_LICENSE("GPL");