aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/dvb/frontends/tda8083.c
blob: 0f041e873781d6f8f09cd276905a6ffd6cc01e39 (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
/*
    Driver for Philips TDA8083 based QPSK Demodulator

    Copyright (C) 2001 Convergence Integrated Media GmbH

    written by Ralph Metzler <ralph@convergence.de>

    adoption to the new DVB frontend API and diagnostic ioctl's
    by Holger Waechtler <holger@convergence.de>

    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/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include "dvb_frontend.h"
#include "tda8083.h"


struct tda8083_state {
	struct i2c_adapter* i2c;
	/* configuration settings */
	const struct tda8083_config* config;
	struct dvb_frontend frontend;
};

static int debug;
#define dprintk(args...) \
	do { \
		if (debug) printk(KERN_DEBUG "tda8083: " args); \
	} while (0)


static u8 tda8083_init_tab [] = {
	0x04, 0x00, 0x4a, 0x79, 0x04, 0x00, 0xff, 0xea,
	0x48, 0x42, 0x79, 0x60, 0x70, 0x52, 0x9a, 0x10,
	0x0e, 0x10, 0xf2, 0xa7, 0x93, 0x0b, 0x05, 0xc8,
	0x9d, 0x00, 0x42, 0x80, 0x00, 0x60, 0x40, 0x00,
	0x00, 0x75, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00
};


static int tda8083_writereg (struct tda8083_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)
		dprintk ("%s: writereg error (reg %02x, ret == %i)\n",
			__FUNCTION__, reg, ret);

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

static int tda8083_readregs (struct tda8083_state* state, u8 reg1, u8 *b, u8 len)
{
	int ret;
	struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = &reg1, .len = 1 },
			   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b, .len = len } };

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

	if (ret != 2)
		dprintk ("%s: readreg error (reg %02x, ret == %i)\n",
			__FUNCTION__, reg1, ret);

	return ret == 2 ? 0 : -1;
}

static inline u8 tda8083_readreg (struct tda8083_state* state, u8 reg)
{
	u8 val;

	tda8083_readregs (state, reg, &val, 1);

	return val;
}

static int tda8083_set_inversion (struct tda8083_state* state, fe_spectral_inversion_t inversion)
{
	/*  XXX FIXME: implement other modes than FEC_AUTO */
	if (inversion == INVERSION_AUTO)
		return 0;

	return -EINVAL;
}

static int tda8083_set_fec (struct tda8083_state* state, fe_code_rate_t fec)
{
	if (fec == FEC_AUTO)
		return tda8083_writereg (state, 0x07, 0xff);

	if (fec >= FEC_1_2 && fec <= FEC_8_9)
		return tda8083_writereg (state, 0x07, 1 << (FEC_8_9 - fec));

	return -EINVAL;
}

static fe_code_rate_t tda8083_get_fec (struct tda8083_state* state)
{
	u8 index;
	static fe_code_rate_t fec_tab [] = { FEC_8_9, FEC_1_2, FEC_2_3, FEC_3_4,
				       FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8 };

	index = tda8083_readreg(state, 0x0e) & 0x07;

	return fec_tab [index];
}

static int tda8083_set_symbolrate (struct tda8083_state* state, u32 srate)
{
	u32 ratio;
	u32 tmp;
	u8 filter;

	if (srate > 32000000)
		srate = 32000000;
	if (srate < 500000)
		srate = 500000;

	filter = 0;
	if (srate < 24000000)
		filter = 2;
	if (srate < 16000000)
		filter = 3;

	tmp = 31250 << 16;
	ratio = tmp / srate;

	tmp = (tmp % srate) << 8;
	ratio = (ratio << 8) + tmp / srate;

	tmp = (tmp % srate) << 8;
	ratio = (ratio << 8) + tmp / srate;

	dprintk("tda8083: ratio == %08x\n", (unsigned int) ratio);

	tda8083_writereg (state, 0x05, filter);
	tda8083_writereg (state, 0x02, (ratio >> 16) & 0xff);
	tda8083_writereg (state, 0x03, (ratio >>  8) & 0xff);
	tda8083_writereg (state, 0x04, (ratio      ) & 0xff);

	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 1;
}

static void tda8083_wait_diseqc_fifo (struct tda8083_state* state, int timeout)
{
	unsigned long start = jiffies;

	while (jiffies - start < timeout &&
	       !(tda8083_readreg(state, 0x02) & 0x80))
	{
		msleep(50);
	};
}

static int tda8083_set_tone (struct tda8083_state* state, fe_sec_tone_mode_t tone)
{
	tda8083_writereg (state, 0x26, 0xf1);

	switch (tone) {
	case SEC_TONE_OFF:
		return tda8083_writereg (state, 0x29, 0x00);
	case SEC_TONE_ON:
		return tda8083_writereg (state, 0x29, 0x80);
	default:
		return -EINVAL;
	};
}

static int tda8083_set_voltage (struct tda8083_state* state, fe_sec_voltage_t voltage)
{
	switch (voltage) {
	case SEC_VOLTAGE_13:
		return tda8083_writereg (state, 0x20, 0x00);
	case SEC_VOLTAGE_18:
		return tda8083_writereg (state, 0x20, 0x11);
	default:
		return -EINVAL;
	};
}

static int tda8083_send_diseqc_burst (struct tda8083_state* state, fe_sec_mini_cmd_t burst)
{
	switch (burst) {
	case SEC_MINI_A:
		tda8083_writereg (state, 0x29, (5 << 2));  /* send burst A */
		break;
	case SEC_MINI_B:
		tda8083_writereg (state, 0x29, (7 << 2));  /* send B */
		break;
	default:
		return -EINVAL;
	};

	tda8083_wait_diseqc_fifo (state, 100);

	return 0;
}

static int tda8083_send_diseqc_msg (struct dvb_frontend* fe,
				    struct dvb_diseqc_master_cmd *m)
{
	struct tda8083_state* state = fe->demodulator_priv;
	int i;

	tda8083_writereg (state, 0x29, (m->msg_len - 3) | (1 << 2)); /* enable */

	for (i=0; i<m->msg_len; i++)
		tda8083_writereg (state, 0x23 + i, m->msg[i]);

	tda8083_writereg (state, 0x29, (m->msg_len - 3) | (3 << 2)); /* send!! */

	tda8083_wait_diseqc_fifo (state, 100);

	return 0;
}

static int tda8083_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
	struct tda8083_state* state = fe->demodulator_priv;

	u8 signal = ~tda8083_readreg (state, 0x01);
	u8 sync = tda8083_readreg (state, 0x02);

	*status = 0;

	if (signal > 10)
		*status |= FE_HAS_SIGNAL;

	if (sync & 0x01)
		*status |= FE_HAS_CARRIER;

	if (sync & 0x02)
		*status |= FE_HAS_VITERBI;

	if (sync & 0x10)
		*status |= FE_HAS_SYNC;

	if (sync & 0x20) /* frontend can not lock */
		*status |= FE_TIMEDOUT;

	if ((sync & 0x1f) == 0x1f)
		*status |= FE_HAS_LOCK;

	return 0;
}

static int tda8083_read_ber(struct dvb_frontend* fe, u32* ber)
{
	struct tda8083_state* state = fe->demodulator_priv;
	int ret;
	u8 buf[3];

	if ((ret = tda8083_readregs(state, 0x0b, buf, sizeof(buf))))
		return ret;

	*ber = ((buf[0] & 0x1f) << 16) | (buf[1] << 8) | buf[2];

	return 0;
}

static int tda8083_read_signal_strength(struct dvb_frontend* fe, u16* strength)
{
	struct tda8083_state* state = fe->demodulator_priv;

	u8 signal = ~tda8083_readreg (state, 0x01);
	*strength = (signal << 8) | signal;

	return 0;
}

static int tda8083_read_snr(struct dvb_frontend* fe, u16* snr)
{
	struct tda8083_state* state = fe->demodulator_priv;

	u8 _snr = tda8083_readreg (state, 0x08);
	*snr = (_snr << 8) | _snr;

	return 0;
}

static int tda8083_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
	struct tda8083_state* state = fe->demodulator_priv;

	*ucblocks = tda8083_readreg(state, 0x0f);
	if (*ucblocks == 0xff)
		*ucblocks = 0xffffffff;

	return 0;
}

static int tda8083_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
	struct tda8083_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);
	}

	tda8083_set_inversion (state, p->inversion);
	tda8083_set_fec (state, p->u.qpsk.fec_inner);
	tda8083_set_symbolrate (state, p->u.qpsk.symbol_rate);

	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 0;
}

static int tda8083_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
	struct tda8083_state* state = fe->demodulator_priv;

	/*  FIXME: get symbolrate & frequency offset...*/
	/*p->frequency = ???;*/
	p->inversion = (tda8083_readreg (state, 0x0e) & 0x80) ?
			INVERSION_ON : INVERSION_OFF;
	p->u.qpsk.fec_inner = tda8083_get_fec (state);
	/*p->u.qpsk.symbol_rate = tda8083_get_symbolrate (state);*/

	return 0;
}

static int tda8083_sleep(struct dvb_frontend* fe)
{
	struct tda8083_state* state = fe->demodulator_priv;

	tda8083_writereg (state, 0x00, 0x02);
	return 0;
}

static int tda8083_init(struct dvb_frontend* fe)
{
	struct tda8083_state* state = fe->demodulator_priv;
	int i;

	for (i=0; i<44; i++)
		tda8083_writereg (state, i, tda8083_init_tab[i]);

	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 0;
}

static int tda8083_diseqc_send_burst(struct dvb_frontend* fe, fe_sec_mini_cmd_t burst)
{
	struct tda8083_state* state = fe->demodulator_priv;

	tda8083_send_diseqc_burst (state, burst);
	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 0;
}

static int tda8083_diseqc_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
{
	struct tda8083_state* state = fe->demodulator_priv;

	tda8083_set_tone (state, tone);
	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 0;
}

static int tda8083_diseqc_set_voltage(struct dvb_frontend* fe, fe_sec_voltage_t voltage)
{
	struct tda8083_state* state = fe->demodulator_priv;

	tda8083_set_voltage (state, voltage);
	tda8083_writereg (state, 0x00, 0x3c);
	tda8083_writereg (state, 0x00, 0x04);

	return 0;
}

static void tda8083_release(struct dvb_frontend* fe)
{
	struct tda8083_state* state = fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops tda8083_ops;

struct dvb_frontend* tda8083_attach(const struct tda8083_config* config,
				    struct i2c_adapter* i2c)
{
	struct tda8083_state* state = NULL;

	/* allocate memory for the internal state */
	state = kmalloc(sizeof(struct tda8083_state), GFP_KERNEL);
	if (state == NULL) goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;

	/* check if the demod is there */
	if ((tda8083_readreg(state, 0x00)) != 0x05) goto error;

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &tda8083_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;

error:
	kfree(state);
	return NULL;
}

static struct dvb_frontend_ops tda8083_ops = {

	.info = {
		.name			= "Philips TDA8083 DVB-S",
		.type			= FE_QPSK,
		.frequency_min		= 920000,     /* TDA8060 */
		.frequency_max		= 2200000,    /* TDA8060 */
		.frequency_stepsize	= 125,   /* kHz for QPSK frontends */
	/*      .frequency_tolerance	= ???,*/
		.symbol_rate_min	= 12000000,
		.symbol_rate_max	= 30000000,
	/*      .symbol_rate_tolerance	= ???,*/
		.caps = FE_CAN_INVERSION_AUTO |
			FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
			FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
			FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
			FE_CAN_QPSK | FE_CAN_MUTE_TS
	},

	.release = tda8083_release,

	.init = tda8083_init,
	.sleep = tda8083_sleep,

	.set_frontend = tda8083_set_frontend,
	.get_frontend = tda8083_get_frontend,

	.read_status = tda8083_read_status,
	.read_signal_strength = tda8083_read_signal_strength,
	.read_snr = tda8083_read_snr,
	.read_ber = tda8083_read_ber,
	.read_ucblocks = tda8083_read_ucblocks,

	.diseqc_send_master_cmd = tda8083_send_diseqc_msg,
	.diseqc_send_burst = tda8083_diseqc_send_burst,
	.set_tone = tda8083_diseqc_set_tone,
	.set_voltage = tda8083_diseqc_set_voltage,
};

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

MODULE_DESCRIPTION("Philips TDA8083 DVB-S Demodulator");
MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(tda8083_attach);