summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb-frontends/tda10021.c
blob: 806c56691ca517da5bccb40e302f3b1117aa2148 (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
/*
    TDA10021  - Single Chip Cable Channel Receiver driver module
	       used on the Siemens DVB-C cards

    Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
    Copyright (C) 2004 Markus Schulz <msc@antzsystem.de>
		   Support for TDA10021

    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/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 "dvb_frontend.h"
#include "tda1002x.h"


struct tda10021_state {
	struct i2c_adapter* i2c;
	/* configuration settings */
	const struct tda1002x_config* config;
	struct dvb_frontend frontend;

	u8 pwm;
	u8 reg0;
};


#if 0
#define dprintk(x...) printk(x)
#else
#define dprintk(x...)
#endif

static int verbose;

#define XIN 57840000UL

#define FIN (XIN >> 4)

static int tda10021_inittab_size = 0x40;
static u8 tda10021_inittab[0x40]=
{
	0x73, 0x6a, 0x23, 0x0a, 0x02, 0x37, 0x77, 0x1a,
	0x37, 0x6a, 0x17, 0x8a, 0x1e, 0x86, 0x43, 0x40,
	0xb8, 0x3f, 0xa1, 0x00, 0xcd, 0x01, 0x00, 0xff,
	0x11, 0x00, 0x7c, 0x31, 0x30, 0x20, 0x00, 0x00,
	0x02, 0x00, 0x00, 0x7d, 0x00, 0x00, 0x00, 0x00,
	0x07, 0x00, 0x33, 0x11, 0x0d, 0x95, 0x08, 0x58,
	0x00, 0x00, 0x80, 0x00, 0x80, 0xff, 0x00, 0x00,
	0x04, 0x2d, 0x2f, 0xff, 0x00, 0x00, 0x00, 0x00,
};

static int _tda10021_writereg (struct tda10021_state* state, u8 reg, u8 data)
{
	u8 buf[] = { reg, data };
	struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
	int ret;

	ret = i2c_transfer (state->i2c, &msg, 1);
	if (ret != 1)
		printk("DVB: TDA10021(%d): %s, writereg error "
			"(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
			state->frontend.dvb->num, __func__, reg, data, ret);

	msleep(10);
	return (ret != 1) ? -EREMOTEIO : 0;
}

static u8 tda10021_readreg (struct tda10021_state* state, u8 reg)
{
	u8 b0 [] = { reg };
	u8 b1 [] = { 0 };
	struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
				  { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
	int ret;

	ret = i2c_transfer (state->i2c, msg, 2);
	// Don't print an error message if the id is read.
	if (ret != 2 && reg != 0x1a)
		printk("DVB: TDA10021: %s: readreg error (ret == %i)\n",
				__func__, ret);
	return b1[0];
}

//get access to tuner
static int lock_tuner(struct tda10021_state* state)
{
	u8 buf[2] = { 0x0f, tda10021_inittab[0x0f] | 0x80 };
	struct i2c_msg msg = {.addr=state->config->demod_address, .flags=0, .buf=buf, .len=2};

	if(i2c_transfer(state->i2c, &msg, 1) != 1)
	{
		printk("tda10021: lock tuner fails\n");
		return -EREMOTEIO;
	}
	return 0;
}

//release access from tuner
static int unlock_tuner(struct tda10021_state* state)
{
	u8 buf[2] = { 0x0f, tda10021_inittab[0x0f] & 0x7f };
	struct i2c_msg msg_post={.addr=state->config->demod_address, .flags=0, .buf=buf, .len=2};

	if(i2c_transfer(state->i2c, &msg_post, 1) != 1)
	{
		printk("tda10021: unlock tuner fails\n");
		return -EREMOTEIO;
	}
	return 0;
}

static int tda10021_setup_reg0(struct tda10021_state *state, u8 reg0,
			       enum fe_spectral_inversion inversion)
{
	reg0 |= state->reg0 & 0x63;

	if ((INVERSION_ON == inversion) ^ (state->config->invert == 0))
		reg0 &= ~0x20;
	else
		reg0 |= 0x20;

	_tda10021_writereg (state, 0x00, reg0 & 0xfe);
	_tda10021_writereg (state, 0x00, reg0 | 0x01);

	state->reg0 = reg0;
	return 0;
}

static int tda10021_set_symbolrate (struct tda10021_state* state, u32 symbolrate)
{
	s32 BDR;
	s32 BDRI;
	s16 SFIL=0;
	u16 NDEC = 0;
	u32 tmp, ratio;

	if (symbolrate > XIN/2)
		symbolrate = XIN/2;
	if (symbolrate < 500000)
		symbolrate = 500000;

	if (symbolrate < XIN/16) NDEC = 1;
	if (symbolrate < XIN/32) NDEC = 2;
	if (symbolrate < XIN/64) NDEC = 3;

	if (symbolrate < (u32)(XIN/12.3)) SFIL = 1;
	if (symbolrate < (u32)(XIN/16))	 SFIL = 0;
	if (symbolrate < (u32)(XIN/24.6)) SFIL = 1;
	if (symbolrate < (u32)(XIN/32))	 SFIL = 0;
	if (symbolrate < (u32)(XIN/49.2)) SFIL = 1;
	if (symbolrate < (u32)(XIN/64))	 SFIL = 0;
	if (symbolrate < (u32)(XIN/98.4)) SFIL = 1;

	symbolrate <<= NDEC;
	ratio = (symbolrate << 4) / FIN;
	tmp =  ((symbolrate << 4) % FIN) << 8;
	ratio = (ratio << 8) + tmp / FIN;
	tmp = (tmp % FIN) << 8;
	ratio = (ratio << 8) + DIV_ROUND_CLOSEST(tmp, FIN);

	BDR = ratio;
	BDRI = (((XIN << 5) / symbolrate) + 1) / 2;

	if (BDRI > 0xFF)
		BDRI = 0xFF;

	SFIL = (SFIL << 4) | tda10021_inittab[0x0E];

	NDEC = (NDEC << 6) | tda10021_inittab[0x03];

	_tda10021_writereg (state, 0x03, NDEC);
	_tda10021_writereg (state, 0x0a, BDR&0xff);
	_tda10021_writereg (state, 0x0b, (BDR>> 8)&0xff);
	_tda10021_writereg (state, 0x0c, (BDR>>16)&0x3f);

	_tda10021_writereg (state, 0x0d, BDRI);
	_tda10021_writereg (state, 0x0e, SFIL);

	return 0;
}

static int tda10021_init (struct dvb_frontend *fe)
{
	struct tda10021_state* state = fe->demodulator_priv;
	int i;

	dprintk("DVB: TDA10021(%d): init chip\n", fe->adapter->num);

	//_tda10021_writereg (fe, 0, 0);

	for (i=0; i<tda10021_inittab_size; i++)
		_tda10021_writereg (state, i, tda10021_inittab[i]);

	_tda10021_writereg (state, 0x34, state->pwm);

	//Comment by markus
	//0x2A[3-0] == PDIV -> P multiplaying factor (P=PDIV+1)(default 0)
	//0x2A[4] == BYPPLL -> Power down mode (default 1)
	//0x2A[5] == LCK -> PLL Lock Flag
	//0x2A[6] == POLAXIN -> Polarity of the input reference clock (default 0)

	//Activate PLL
	_tda10021_writereg(state, 0x2a, tda10021_inittab[0x2a] & 0xef);
	return 0;
}

struct qam_params {
	u8 conf, agcref, lthr, mseth, aref;
};

static int tda10021_set_parameters(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	u32 delsys  = c->delivery_system;
	unsigned qam = c->modulation;
	bool is_annex_c;
	u32 reg0x3d;
	struct tda10021_state* state = fe->demodulator_priv;
	static const struct qam_params qam_params[] = {
		/* Modulation  Conf  AGCref  LTHR  MSETH  AREF */
		[QPSK]	   = { 0x14, 0x78,   0x78, 0x8c,  0x96 },
		[QAM_16]   = { 0x00, 0x8c,   0x87, 0xa2,  0x91 },
		[QAM_32]   = { 0x04, 0x8c,   0x64, 0x74,  0x96 },
		[QAM_64]   = { 0x08, 0x6a,   0x46, 0x43,  0x6a },
		[QAM_128]  = { 0x0c, 0x78,   0x36, 0x34,  0x7e },
		[QAM_256]  = { 0x10, 0x5c,   0x26, 0x23,  0x6b },
	};

	switch (delsys) {
	case SYS_DVBC_ANNEX_A:
		is_annex_c = false;
		break;
	case SYS_DVBC_ANNEX_C:
		is_annex_c = true;
		break;
	default:
		return -EINVAL;
	}

	/*
	 * gcc optimizes the code below the same way as it would code:
	 *           "if (qam > 5) return -EINVAL;"
	 * Yet, the code is clearer, as it shows what QAM standards are
	 * supported by the driver, and avoids the usage of magic numbers on
	 * it.
	 */
	switch (qam) {
	case QPSK:
	case QAM_16:
	case QAM_32:
	case QAM_64:
	case QAM_128:
	case QAM_256:
		break;
	default:
		return -EINVAL;
	}

	if (c->inversion != INVERSION_ON && c->inversion != INVERSION_OFF)
		return -EINVAL;

	/*printk("tda10021: set frequency to %d qam=%d symrate=%d\n", p->frequency,qam,p->symbol_rate);*/

	if (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);
	}

	tda10021_set_symbolrate(state, c->symbol_rate);
	_tda10021_writereg(state, 0x34, state->pwm);

	_tda10021_writereg(state, 0x01, qam_params[qam].agcref);
	_tda10021_writereg(state, 0x05, qam_params[qam].lthr);
	_tda10021_writereg(state, 0x08, qam_params[qam].mseth);
	_tda10021_writereg(state, 0x09, qam_params[qam].aref);

	/*
	 * Bit 0 == 0 means roll-off = 0.15 (Annex A)
	 *	 == 1 means roll-off = 0.13 (Annex C)
	 */
	reg0x3d = tda10021_readreg (state, 0x3d);
	if (is_annex_c)
		_tda10021_writereg (state, 0x3d, 0x01 | reg0x3d);
	else
		_tda10021_writereg (state, 0x3d, 0xfe & reg0x3d);
	tda10021_setup_reg0(state, qam_params[qam].conf, c->inversion);

	return 0;
}

static int tda10021_read_status(struct dvb_frontend *fe,
				enum fe_status *status)
{
	struct tda10021_state* state = fe->demodulator_priv;
	int sync;

	*status = 0;
	//0x11[0] == EQALGO -> Equalizer algorithms state
	//0x11[1] == CARLOCK -> Carrier locked
	//0x11[2] == FSYNC -> Frame synchronisation
	//0x11[3] == FEL -> Front End locked
	//0x11[6] == NODVB -> DVB Mode Information
	sync = tda10021_readreg (state, 0x11);

	if (sync & 2)
		*status |= FE_HAS_SIGNAL|FE_HAS_CARRIER;

	if (sync & 4)
		*status |= FE_HAS_SYNC|FE_HAS_VITERBI;

	if (sync & 8)
		*status |= FE_HAS_LOCK;

	return 0;
}

static int tda10021_read_ber(struct dvb_frontend* fe, u32* ber)
{
	struct tda10021_state* state = fe->demodulator_priv;

	u32 _ber = tda10021_readreg(state, 0x14) |
		(tda10021_readreg(state, 0x15) << 8) |
		((tda10021_readreg(state, 0x16) & 0x0f) << 16);
	_tda10021_writereg(state, 0x10, (tda10021_readreg(state, 0x10) & ~0xc0)
					| (tda10021_inittab[0x10] & 0xc0));
	*ber = 10 * _ber;

	return 0;
}

static int tda10021_read_signal_strength(struct dvb_frontend* fe, u16* strength)
{
	struct tda10021_state* state = fe->demodulator_priv;

	u8 config = tda10021_readreg(state, 0x02);
	u8 gain = tda10021_readreg(state, 0x17);
	if (config & 0x02)
		/* the agc value is inverted */
		gain = ~gain;
	*strength = (gain << 8) | gain;

	return 0;
}

static int tda10021_read_snr(struct dvb_frontend* fe, u16* snr)
{
	struct tda10021_state* state = fe->demodulator_priv;

	u8 quality = ~tda10021_readreg(state, 0x18);
	*snr = (quality << 8) | quality;

	return 0;
}

static int tda10021_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
	struct tda10021_state* state = fe->demodulator_priv;

	*ucblocks = tda10021_readreg (state, 0x13) & 0x7f;
	if (*ucblocks == 0x7f)
		*ucblocks = 0xffffffff;

	/* reset uncorrected block counter */
	_tda10021_writereg (state, 0x10, tda10021_inittab[0x10] & 0xdf);
	_tda10021_writereg (state, 0x10, tda10021_inittab[0x10]);

	return 0;
}

static int tda10021_get_frontend(struct dvb_frontend *fe,
				 struct dtv_frontend_properties *p)
{
	struct tda10021_state* state = fe->demodulator_priv;
	int sync;
	s8 afc = 0;

	sync = tda10021_readreg(state, 0x11);
	afc = tda10021_readreg(state, 0x19);
	if (verbose) {
		/* AFC only valid when carrier has been recovered */
		printk(sync & 2 ? "DVB: TDA10021(%d): AFC (%d) %dHz\n" :
				  "DVB: TDA10021(%d): [AFC (%d) %dHz]\n",
			state->frontend.dvb->num, afc,
		       -((s32)p->symbol_rate * afc) >> 10);
	}

	p->inversion = ((state->reg0 & 0x20) == 0x20) ^ (state->config->invert != 0) ? INVERSION_ON : INVERSION_OFF;
	p->modulation = ((state->reg0 >> 2) & 7) + QAM_16;

	p->fec_inner = FEC_NONE;
	p->frequency = ((p->frequency + 31250) / 62500) * 62500;

	if (sync & 2)
		p->frequency -= ((s32)p->symbol_rate * afc) >> 10;

	return 0;
}

static int tda10021_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
{
	struct tda10021_state* state = fe->demodulator_priv;

	if (enable) {
		lock_tuner(state);
	} else {
		unlock_tuner(state);
	}
	return 0;
}

static int tda10021_sleep(struct dvb_frontend* fe)
{
	struct tda10021_state* state = fe->demodulator_priv;

	_tda10021_writereg (state, 0x1b, 0x02);  /* pdown ADC */
	_tda10021_writereg (state, 0x00, 0x80);  /* standby */

	return 0;
}

static void tda10021_release(struct dvb_frontend* fe)
{
	struct tda10021_state* state = fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops tda10021_ops;

struct dvb_frontend* tda10021_attach(const struct tda1002x_config* config,
				     struct i2c_adapter* i2c,
				     u8 pwm)
{
	struct tda10021_state* state = NULL;
	u8 id;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct tda10021_state), GFP_KERNEL);
	if (state == NULL) goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;
	state->pwm = pwm;
	state->reg0 = tda10021_inittab[0];

	/* check if the demod is there */
	id = tda10021_readreg(state, 0x1a);
	if ((id & 0xf0) != 0x70) goto error;

	/* Don't claim TDA10023 */
	if (id == 0x7d)
		goto error;

	printk("TDA10021: i2c-addr = 0x%02x, id = 0x%02x\n",
	       state->config->demod_address, id);

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &tda10021_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;

error:
	kfree(state);
	return NULL;
}

static struct dvb_frontend_ops tda10021_ops = {
	.delsys = { SYS_DVBC_ANNEX_A, SYS_DVBC_ANNEX_C },
	.info = {
		.name = "Philips TDA10021 DVB-C",
		.frequency_stepsize = 62500,
		.frequency_min = 47000000,
		.frequency_max = 862000000,
		.symbol_rate_min = (XIN/2)/64,     /* SACLK/64 == (XIN/2)/64 */
		.symbol_rate_max = (XIN/2)/4,      /* SACLK/4 */
	#if 0
		.frequency_tolerance = ???,
		.symbol_rate_tolerance = ???,  /* ppm */  /* == 8% (spec p. 5) */
	#endif
		.caps = 0x400 | //FE_CAN_QAM_4
			FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 |
			FE_CAN_QAM_128 | FE_CAN_QAM_256 |
			FE_CAN_FEC_AUTO
	},

	.release = tda10021_release,

	.init = tda10021_init,
	.sleep = tda10021_sleep,
	.i2c_gate_ctrl = tda10021_i2c_gate_ctrl,

	.set_frontend = tda10021_set_parameters,
	.get_frontend = tda10021_get_frontend,

	.read_status = tda10021_read_status,
	.read_ber = tda10021_read_ber,
	.read_signal_strength = tda10021_read_signal_strength,
	.read_snr = tda10021_read_snr,
	.read_ucblocks = tda10021_read_ucblocks,
};

module_param(verbose, int, 0644);
MODULE_PARM_DESC(verbose, "print AFC offset after tuning for debugging the PWM setting");

MODULE_DESCRIPTION("Philips TDA10021 DVB-C demodulator driver");
MODULE_AUTHOR("Ralph Metzler, Holger Waechtler, Markus Schulz");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(tda10021_attach);