aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/dvb/frontends/cx22702.c
blob: a129fc9cba30f12f4f708645d9340476da3a1408 (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
/*
    Conexant 22702 DVB OFDM demodulator driver

    based on:
	Alps TDMB7 DVB OFDM demodulator driver

    Copyright (C) 2001-2002 Convergence Integrated Media GmbH
	  Holger Waechtler <holger@convergence.de>

    Copyright (C) 2004 Steven Toth <stoth@hauppauge.com>

    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 "dvb-pll.h"
#include "cx22702.h"


struct cx22702_state {

	struct i2c_adapter* i2c;

	struct dvb_frontend_ops ops;

	/* configuration settings */
	const struct cx22702_config* config;

	struct dvb_frontend frontend;

	/* previous uncorrected block counter */
	u8 prevUCBlocks;
};

static int debug = 0;
#define dprintk	if (debug) printk

/* Register values to initialise the demod */
static u8 init_tab [] = {
	0x00, 0x00, /* Stop aquisition */
	0x0B, 0x06,
	0x09, 0x01,
	0x0D, 0x41,
	0x16, 0x32,
	0x20, 0x0A,
	0x21, 0x17,
	0x24, 0x3e,
	0x26, 0xff,
	0x27, 0x10,
	0x28, 0x00,
	0x29, 0x00,
	0x2a, 0x10,
	0x2b, 0x00,
	0x2c, 0x10,
	0x2d, 0x00,
	0x48, 0xd4,
	0x49, 0x56,
	0x6b, 0x1e,
	0xc8, 0x02,
	0xf9, 0x00,
	0xfa, 0x00,
	0xfb, 0x00,
	0xfc, 0x00,
	0xfd, 0x00,
};

static int cx22702_writereg (struct cx22702_state* state, u8 reg, u8 data)
{
	int ret;
	u8 buf [] = { reg, data };
	struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };

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

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

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

static u8 cx22702_readreg (struct cx22702_state* state, u8 reg)
{
	int ret;
	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 } };

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

	if (ret != 2)
		printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);

	return b1[0];
}

static int cx22702_set_inversion (struct cx22702_state *state, int inversion)
{
	u8 val;

	switch (inversion) {

		case INVERSION_AUTO:
			return -EOPNOTSUPP;

		case INVERSION_ON:
			val = cx22702_readreg (state, 0x0C);
			return cx22702_writereg (state, 0x0C, val | 0x01);

		case INVERSION_OFF:
			val = cx22702_readreg (state, 0x0C);
			return cx22702_writereg (state, 0x0C, val & 0xfe);

		default:
			return -EINVAL;

	}

}

/* Retrieve the demod settings */
static int cx22702_get_tps (struct cx22702_state *state, struct dvb_ofdm_parameters *p)
{
	u8 val;

	/* Make sure the TPS regs are valid */
	if (!(cx22702_readreg(state, 0x0A) & 0x20))
		return -EAGAIN;

	val = cx22702_readreg (state, 0x01);
	switch( (val&0x18)>>3) {
		case 0: p->constellation =   QPSK; break;
		case 1: p->constellation = QAM_16; break;
		case 2: p->constellation = QAM_64; break;
	}
	switch( val&0x07 ) {
		case 0: p->hierarchy_information = HIERARCHY_NONE; break;
		case 1: p->hierarchy_information =    HIERARCHY_1; break;
		case 2: p->hierarchy_information =    HIERARCHY_2; break;
		case 3: p->hierarchy_information =    HIERARCHY_4; break;
	}


	val = cx22702_readreg (state, 0x02);
	switch( (val&0x38)>>3 ) {
		case 0: p->code_rate_HP = FEC_1_2; break;
		case 1: p->code_rate_HP = FEC_2_3; break;
		case 2: p->code_rate_HP = FEC_3_4; break;
		case 3: p->code_rate_HP = FEC_5_6; break;
		case 4: p->code_rate_HP = FEC_7_8; break;
	}
	switch( val&0x07 ) {
		case 0: p->code_rate_LP = FEC_1_2; break;
		case 1: p->code_rate_LP = FEC_2_3; break;
		case 2: p->code_rate_LP = FEC_3_4; break;
		case 3: p->code_rate_LP = FEC_5_6; break;
		case 4: p->code_rate_LP = FEC_7_8; break;
	}


	val = cx22702_readreg (state, 0x03);
	switch( (val&0x0c)>>2 ) {
		case 0: p->guard_interval = GUARD_INTERVAL_1_32; break;
		case 1: p->guard_interval = GUARD_INTERVAL_1_16; break;
		case 2: p->guard_interval =  GUARD_INTERVAL_1_8; break;
		case 3: p->guard_interval =  GUARD_INTERVAL_1_4; break;
	}
	switch( val&0x03 ) {
		case 0: p->transmission_mode = TRANSMISSION_MODE_2K; break;
		case 1: p->transmission_mode = TRANSMISSION_MODE_8K; break;
	}

	return 0;
}

static int cx22702_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
{
	struct cx22702_state* state = fe->demodulator_priv;
	dprintk ("%s(%d)\n", __FUNCTION__, enable);
	if (enable)
		return cx22702_writereg (state, 0x0D, cx22702_readreg(state, 0x0D) & 0xfe);
	else
		return cx22702_writereg (state, 0x0D, cx22702_readreg(state, 0x0D) | 1);
}

/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
static int cx22702_set_tps (struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
	u8 val;
	struct cx22702_state* state = fe->demodulator_priv;

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

	/* set inversion */
	cx22702_set_inversion (state, p->inversion);

	/* set bandwidth */
	switch(p->u.ofdm.bandwidth) {
	case BANDWIDTH_6_MHZ:
		cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20 );
		break;
	case BANDWIDTH_7_MHZ:
		cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10 );
		break;
	case BANDWIDTH_8_MHZ:
		cx22702_writereg(state, 0x0C, cx22702_readreg(state, 0x0C) &0xcf );
		break;
	default:
		dprintk ("%s: invalid bandwidth\n",__FUNCTION__);
		return -EINVAL;
	}


	p->u.ofdm.code_rate_LP = FEC_AUTO; //temp hack as manual not working

	/* use auto configuration? */
	if((p->u.ofdm.hierarchy_information==HIERARCHY_AUTO) ||
	   (p->u.ofdm.constellation==QAM_AUTO) ||
	   (p->u.ofdm.code_rate_HP==FEC_AUTO) ||
	   (p->u.ofdm.code_rate_LP==FEC_AUTO) ||
	   (p->u.ofdm.guard_interval==GUARD_INTERVAL_AUTO) ||
	   (p->u.ofdm.transmission_mode==TRANSMISSION_MODE_AUTO) ) {

		/* TPS Source - use hardware driven values */
		cx22702_writereg(state, 0x06, 0x10);
		cx22702_writereg(state, 0x07, 0x9);
		cx22702_writereg(state, 0x08, 0xC1);
		cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B) & 0xfc );
		cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
		cx22702_writereg(state, 0x00, 0x01); /* Begin aquisition */
		dprintk("%s: Autodetecting\n",__FUNCTION__);
		return 0;
	}

	/* manually programmed values */
	val=0;
	switch(p->u.ofdm.constellation) {
		case   QPSK: val = (val&0xe7); break;
		case QAM_16: val = (val&0xe7)|0x08; break;
		case QAM_64: val = (val&0xe7)|0x10; break;
		default:
			dprintk ("%s: invalid constellation\n",__FUNCTION__);
			return -EINVAL;
	}
	switch(p->u.ofdm.hierarchy_information) {
		case HIERARCHY_NONE: val = (val&0xf8); break;
		case    HIERARCHY_1: val = (val&0xf8)|1; break;
		case    HIERARCHY_2: val = (val&0xf8)|2; break;
		case    HIERARCHY_4: val = (val&0xf8)|3; break;
		default:
			dprintk ("%s: invalid hierarchy\n",__FUNCTION__);
			return -EINVAL;
	}
	cx22702_writereg (state, 0x06, val);

	val=0;
	switch(p->u.ofdm.code_rate_HP) {
		case FEC_NONE:
		case FEC_1_2: val = (val&0xc7); break;
		case FEC_2_3: val = (val&0xc7)|0x08; break;
		case FEC_3_4: val = (val&0xc7)|0x10; break;
		case FEC_5_6: val = (val&0xc7)|0x18; break;
		case FEC_7_8: val = (val&0xc7)|0x20; break;
		default:
			dprintk ("%s: invalid code_rate_HP\n",__FUNCTION__);
			return -EINVAL;
	}
	switch(p->u.ofdm.code_rate_LP) {
		case FEC_NONE:
		case FEC_1_2: val = (val&0xf8); break;
		case FEC_2_3: val = (val&0xf8)|1; break;
		case FEC_3_4: val = (val&0xf8)|2; break;
		case FEC_5_6: val = (val&0xf8)|3; break;
		case FEC_7_8: val = (val&0xf8)|4; break;
		default:
			dprintk ("%s: invalid code_rate_LP\n",__FUNCTION__);
			return -EINVAL;
	}
	cx22702_writereg (state, 0x07, val);

	val=0;
	switch(p->u.ofdm.guard_interval) {
		case GUARD_INTERVAL_1_32: val = (val&0xf3); break;
		case GUARD_INTERVAL_1_16: val = (val&0xf3)|0x04; break;
		case  GUARD_INTERVAL_1_8: val = (val&0xf3)|0x08; break;
		case  GUARD_INTERVAL_1_4: val = (val&0xf3)|0x0c; break;
		default:
			dprintk ("%s: invalid guard_interval\n",__FUNCTION__);
			return -EINVAL;
	}
	switch(p->u.ofdm.transmission_mode) {
		case TRANSMISSION_MODE_2K: val = (val&0xfc); break;
		case TRANSMISSION_MODE_8K: val = (val&0xfc)|1; break;
		default:
			dprintk ("%s: invalid transmission_mode\n",__FUNCTION__);
			return -EINVAL;
	}
	cx22702_writereg(state, 0x08, val);
	cx22702_writereg(state, 0x0B, (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02 );
	cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );

	/* Begin channel aquisition */
	cx22702_writereg(state, 0x00, 0x01);

	return 0;
}

/* Reset the demod hardware and reset all of the configuration registers
   to a default state. */
static int cx22702_init (struct dvb_frontend* fe)
{
	int i;
	struct cx22702_state* state = fe->demodulator_priv;

	cx22702_writereg (state, 0x00, 0x02);

	msleep(10);

	for (i=0; i<sizeof(init_tab); i+=2)
		cx22702_writereg (state, init_tab[i], init_tab[i+1]);

	cx22702_writereg (state, 0xf8, (state->config->output_mode << 1) & 0x02);

	cx22702_i2c_gate_ctrl(fe, 0);

	return 0;
}

static int cx22702_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
	struct cx22702_state* state = fe->demodulator_priv;
	u8 reg0A;
	u8 reg23;

	*status = 0;

	reg0A = cx22702_readreg (state, 0x0A);
	reg23 = cx22702_readreg (state, 0x23);

	dprintk ("%s: status demod=0x%02x agc=0x%02x\n"
		,__FUNCTION__,reg0A,reg23);

	if(reg0A & 0x10) {
		*status |= FE_HAS_LOCK;
		*status |= FE_HAS_VITERBI;
		*status |= FE_HAS_SYNC;
	}

	if(reg0A & 0x20)
		*status |= FE_HAS_CARRIER;

	if(reg23 < 0xf0)
		*status |= FE_HAS_SIGNAL;

	return 0;
}

static int cx22702_read_ber(struct dvb_frontend* fe, u32* ber)
{
	struct cx22702_state* state = fe->demodulator_priv;

	if(cx22702_readreg (state, 0xE4) & 0x02) {
		/* Realtime statistics */
		*ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
			| (cx22702_readreg (state, 0xDF)&0x7F);
	} else {
		/* Averagtine statistics */
		*ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
			| cx22702_readreg (state, 0xDF);
	}

	return 0;
}

static int cx22702_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
{
	struct cx22702_state* state = fe->demodulator_priv;

	*signal_strength = cx22702_readreg (state, 0x23);

	return 0;
}

static int cx22702_read_snr(struct dvb_frontend* fe, u16* snr)
{
	struct cx22702_state* state = fe->demodulator_priv;

	u16 rs_ber=0;
	if(cx22702_readreg (state, 0xE4) & 0x02) {
		/* Realtime statistics */
		rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
			| (cx22702_readreg (state, 0xDF)& 0x7F);
	} else {
		/* Averagine statistics */
		rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 8
			| cx22702_readreg (state, 0xDF);
	}
	*snr = ~rs_ber;

	return 0;
}

static int cx22702_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
	struct cx22702_state* state = fe->demodulator_priv;

	u8 _ucblocks;

	/* RS Uncorrectable Packet Count then reset */
	_ucblocks = cx22702_readreg (state, 0xE3);
	if (state->prevUCBlocks < _ucblocks)
		*ucblocks = (_ucblocks - state->prevUCBlocks);
	else
		*ucblocks = state->prevUCBlocks - _ucblocks;
	state->prevUCBlocks = _ucblocks;

	return 0;
}

static int cx22702_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
	struct cx22702_state* state = fe->demodulator_priv;

	u8 reg0C = cx22702_readreg (state, 0x0C);

	p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
	return cx22702_get_tps (state, &p->u.ofdm);
}

static int cx22702_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
{
	tune->min_delay_ms = 1000;
	return 0;
}

static void cx22702_release(struct dvb_frontend* fe)
{
	struct cx22702_state* state = fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops cx22702_ops;

struct dvb_frontend* cx22702_attach(const struct cx22702_config* config,
				    struct i2c_adapter* i2c)
{
	struct cx22702_state* state = NULL;

	/* allocate memory for the internal state */
	state = kmalloc(sizeof(struct cx22702_state), GFP_KERNEL);
	if (state == NULL)
		goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;
	memcpy(&state->ops, &cx22702_ops, sizeof(struct dvb_frontend_ops));
	state->prevUCBlocks = 0;

	/* check if the demod is there */
	if (cx22702_readreg(state, 0x1f) != 0x3)
		goto error;

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

error:
	kfree(state);
	return NULL;
}

static struct dvb_frontend_ops cx22702_ops = {

	.info = {
		.name			= "Conexant CX22702 DVB-T",
		.type			= FE_OFDM,
		.frequency_min		= 177000000,
		.frequency_max		= 858000000,
		.frequency_stepsize	= 166666,
		.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_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
		FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
		FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
	},

	.release = cx22702_release,

	.init = cx22702_init,
	.i2c_gate_ctrl = cx22702_i2c_gate_ctrl,

	.set_frontend = cx22702_set_tps,
	.get_frontend = cx22702_get_frontend,
	.get_tune_settings = cx22702_get_tune_settings,

	.read_status = cx22702_read_status,
	.read_ber = cx22702_read_ber,
	.read_signal_strength = cx22702_read_signal_strength,
	.read_snr = cx22702_read_snr,
	.read_ucblocks = cx22702_read_ucblocks,
};

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

MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver");
MODULE_AUTHOR("Steven Toth");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(cx22702_attach);