2 * Driver for Zarlink DVB-T MT352 demodulator
4 * Written by Holger Waechtler <holger@qanu.de>
5 * and Daniel Mack <daniel@qanu.de>
7 * AVerMedia AVerTV DVB-T 771 support by
8 * Wolfram Joost <dbox2@frokaschwei.de>
10 * Support for Samsung TDTC9251DH01C(M) tuner
11 * Copyright (C) 2004 Antonio Mancuso <antonio.mancuso@digitaltelevision.it>
12 * Amauri Celani <acelani@essegi.net>
14 * DVICO FusionHDTV DVB-T1 and DVICO FusionHDTV DVB-T Lite support by
15 * Christopher Pascoe <c.pascoe@itee.uq.edu.au>
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.=
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/moduleparam.h>
36 #include <linux/init.h>
37 #include <linux/delay.h>
39 #include "dvb_frontend.h"
40 #include "mt352_priv.h"
45 struct i2c_adapter* i2c;
47 struct dvb_frontend_ops ops;
49 /* configuration settings */
50 const struct mt352_config* config;
52 struct dvb_frontend frontend;
56 #define dprintk(args...) \
58 if (debug) printk(KERN_DEBUG "mt352: " args); \
61 int mt352_write(struct dvb_frontend* fe, u8* ibuf, int ilen)
63 struct mt352_state* state = (struct mt352_state*) fe->demodulator_priv;
64 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0,
65 .buf = ibuf, .len = ilen };
66 int err = i2c_transfer(state->i2c, &msg, 1);
68 dprintk("mt352_write() failed (err = %d)!\n", err);
75 static u8 mt352_read_register(struct mt352_state* state, u8 reg)
80 struct i2c_msg msg [] = { { .addr = state->config->demod_address,
82 .buf = b0, .len = 1 },
83 { .addr = state->config->demod_address,
85 .buf = b1, .len = 1 } };
87 ret = i2c_transfer(state->i2c, msg, 2);
90 dprintk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
106 static int mt352_sleep(struct dvb_frontend* fe)
108 static u8 mt352_softdown[] = { CLOCK_CTL, 0x20, 0x08 };
110 mt352_write(fe, mt352_softdown, sizeof(mt352_softdown));
115 static int mt352_set_parameters(struct dvb_frontend* fe,
116 struct dvb_frontend_parameters *param)
118 struct mt352_state* state = (struct mt352_state*) fe->demodulator_priv;
119 unsigned char buf[14];
120 unsigned int tps = 0;
121 struct dvb_ofdm_parameters *op = ¶m->u.ofdm;
124 switch (op->code_rate_HP) {
144 switch (op->code_rate_LP) {
161 if (op->hierarchy_information == HIERARCHY_AUTO ||
162 op->hierarchy_information == HIERARCHY_NONE)
168 switch (op->constellation) {
182 switch (op->transmission_mode) {
183 case TRANSMISSION_MODE_2K:
184 case TRANSMISSION_MODE_AUTO:
186 case TRANSMISSION_MODE_8K:
193 switch (op->guard_interval) {
194 case GUARD_INTERVAL_1_32:
195 case GUARD_INTERVAL_AUTO:
197 case GUARD_INTERVAL_1_16:
200 case GUARD_INTERVAL_1_8:
203 case GUARD_INTERVAL_1_4:
210 switch (op->hierarchy_information) {
228 buf[0] = TPS_GIVEN_1; /* TPS_GIVEN_1 and following registers */
230 buf[1] = msb(tps); /* TPS_GIVEN_(1|0) */
236 * these settings assume 20.48MHz f_ADC, for other tuners you might
237 * need other values. See p. 33 in the MT352 Design Manual.
239 if (op->bandwidth == BANDWIDTH_8_MHZ) {
240 buf[4] = 0x72; /* TRL_NOMINAL_RATE_(1|0) */
242 } else if (op->bandwidth == BANDWIDTH_7_MHZ) {
250 buf[6] = 0x31; /* INPUT_FREQ_(1|0), 20.48MHz clock, 36.166667MHz IF */
251 buf[7] = 0x05; /* see MT352 Design Manual page 32 for details */
253 state->config->pll_set(fe, param, buf+8);
255 buf[13] = 0x01; /* TUNER_GO!! */
257 /* Only send the tuning request if the tuner doesn't have the requested
258 * parameters already set. Enhances tuning time and prevents stream
259 * breakup when retuning the same transponder. */
260 for (i = 1; i < 13; i++)
261 if (buf[i] != mt352_read_register(state, i + 0x50)) {
262 mt352_write(fe, buf, sizeof(buf));
269 static int mt352_get_parameters(struct dvb_frontend* fe,
270 struct dvb_frontend_parameters *param)
272 struct mt352_state* state = (struct mt352_state*) fe->demodulator_priv;
276 struct dvb_ofdm_parameters *op = ¶m->u.ofdm;
277 static const u8 tps_fec_to_api[8] =
289 if ( (mt352_read_register(state,0x00) & 0xC0) != 0xC0 )
294 /* Use TPS_RECEIVED-registers, not the TPS_CURRENT-registers because
295 * the mt352 sometimes works with the wrong parameters
297 tps = (mt352_read_register(state, TPS_RECEIVED_1) << 8) | mt352_read_register(state, TPS_RECEIVED_0);
298 div = (mt352_read_register(state, CHAN_START_1) << 8) | mt352_read_register(state, CHAN_START_0);
299 trl = mt352_read_register(state, TRL_NOMINAL_RATE_1);
301 op->code_rate_HP = tps_fec_to_api[(tps >> 7) & 7];
302 op->code_rate_LP = tps_fec_to_api[(tps >> 4) & 7];
304 switch ( (tps >> 13) & 3)
307 op->constellation = QPSK;
310 op->constellation = QAM_16;
313 op->constellation = QAM_64;
316 op->constellation = QAM_AUTO;
320 op->transmission_mode = (tps & 0x01) ? TRANSMISSION_MODE_8K : TRANSMISSION_MODE_2K;
322 switch ( (tps >> 2) & 3)
325 op->guard_interval = GUARD_INTERVAL_1_32;
328 op->guard_interval = GUARD_INTERVAL_1_16;
331 op->guard_interval = GUARD_INTERVAL_1_8;
334 op->guard_interval = GUARD_INTERVAL_1_4;
337 op->guard_interval = GUARD_INTERVAL_AUTO;
341 switch ( (tps >> 10) & 7)
344 op->hierarchy_information = HIERARCHY_NONE;
347 op->hierarchy_information = HIERARCHY_1;
350 op->hierarchy_information = HIERARCHY_2;
353 op->hierarchy_information = HIERARCHY_4;
356 op->hierarchy_information = HIERARCHY_AUTO;
360 param->frequency = ( 500 * (div - IF_FREQUENCYx6) ) / 3 * 1000;
364 op->bandwidth = BANDWIDTH_8_MHZ;
366 else if (trl == 0x64)
368 op->bandwidth = BANDWIDTH_7_MHZ;
372 op->bandwidth = BANDWIDTH_6_MHZ;
376 if (mt352_read_register(state, STATUS_2) & 0x02)
377 param->inversion = INVERSION_OFF;
379 param->inversion = INVERSION_ON;
384 static int mt352_read_status(struct dvb_frontend* fe, fe_status_t* status)
386 struct mt352_state* state = (struct mt352_state*) fe->demodulator_priv;
390 r = mt352_read_register (state, STATUS_0);
392 *status = FE_HAS_CARRIER;
394 *status |= FE_HAS_VITERBI;
396 *status |= FE_HAS_LOCK;
398 r = mt352_read_register (state, STATUS_1);
400 *status |= FE_HAS_SYNC;
402 r = mt352_read_register (state, STATUS_3);
404 *status |= FE_HAS_SIGNAL;
406 if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
407 (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
408 *status &= ~FE_HAS_LOCK;
413 static int mt352_read_ber(struct dvb_frontend* fe, u32* ber)
415 struct mt352_state* state = (struct mt352_state*) fe->demodulator_priv;
417 *ber = (mt352_read_register (state, RS_ERR_CNT_2) << 16) |
418 (mt352_read_register (state, RS_ERR_CNT_1) << 8) |
419 (mt352_read_register (state, RS_ERR_CNT_0));
424 static int mt352_read_signal_strength(struct dvb_frontend* fe, u16* strength)
426 struct mt352_state* state = (struct mt352_state*) fe->demodulator_priv;
428 u16 signal = (mt352_read_register (state, AGC_GAIN_3) << 8) |
429 (mt352_read_register (state, AGC_GAIN_2));
435 static int mt352_read_snr(struct dvb_frontend* fe, u16* snr)
437 struct mt352_state* state = (struct mt352_state*) fe->demodulator_priv;
439 u8 _snr = mt352_read_register (state, SNR);
440 *snr = (_snr << 8) | _snr;
445 static int mt352_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
447 struct mt352_state* state = (struct mt352_state*) fe->demodulator_priv;
449 *ucblocks = (mt352_read_register (state, RS_UBC_1) << 8) |
450 (mt352_read_register (state, RS_UBC_0));
455 static int mt352_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
457 fe_tune_settings->min_delay_ms = 800;
458 fe_tune_settings->step_size = 0;
459 fe_tune_settings->max_drift = 0;
464 static int mt352_init(struct dvb_frontend* fe)
466 struct mt352_state* state = (struct mt352_state*) fe->demodulator_priv;
468 static u8 mt352_reset_attach [] = { RESET, 0xC0 };
470 if ((mt352_read_register(state, CLOCK_CTL) & 0x10) == 0 ||
471 (mt352_read_register(state, CONFIG) & 0x20) == 0) {
473 /* Do a "hard" reset */
474 mt352_write(fe, mt352_reset_attach, sizeof(mt352_reset_attach));
475 return state->config->demod_init(fe);
481 static void mt352_release(struct dvb_frontend* fe)
483 struct mt352_state* state = (struct mt352_state*) fe->demodulator_priv;
487 static struct dvb_frontend_ops mt352_ops;
489 struct dvb_frontend* mt352_attach(const struct mt352_config* config,
490 struct i2c_adapter* i2c)
492 struct mt352_state* state = NULL;
494 /* allocate memory for the internal state */
495 state = (struct mt352_state*) kmalloc(sizeof(struct mt352_state), GFP_KERNEL);
496 if (state == NULL) goto error;
498 /* setup the state */
499 state->config = config;
501 memcpy(&state->ops, &mt352_ops, sizeof(struct dvb_frontend_ops));
503 /* check if the demod is there */
504 if (mt352_read_register(state, CHIP_ID) != ID_MT352) goto error;
506 /* create dvb_frontend */
507 state->frontend.ops = &state->ops;
508 state->frontend.demodulator_priv = state;
509 return &state->frontend;
512 if (state) kfree(state);
516 static struct dvb_frontend_ops mt352_ops = {
519 .name = "Zarlink MT352 DVB-T",
521 .frequency_min = 174000000,
522 .frequency_max = 862000000,
523 .frequency_stepsize = 166667,
524 .frequency_tolerance = 0,
525 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
526 FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
528 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
529 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
530 FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
534 .release = mt352_release,
537 .sleep = mt352_sleep,
539 .set_frontend = mt352_set_parameters,
540 .get_frontend = mt352_get_parameters,
541 .get_tune_settings = mt352_get_tune_settings,
543 .read_status = mt352_read_status,
544 .read_ber = mt352_read_ber,
545 .read_signal_strength = mt352_read_signal_strength,
546 .read_snr = mt352_read_snr,
547 .read_ucblocks = mt352_read_ucblocks,
550 module_param(debug, int, 0644);
551 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
553 MODULE_DESCRIPTION("Zarlink MT352 DVB-T Demodulator driver");
554 MODULE_AUTHOR("Holger Waechtler, Daniel Mack, Antonio Mancuso");
555 MODULE_LICENSE("GPL");
557 EXPORT_SYMBOL(mt352_attach);
558 EXPORT_SYMBOL(mt352_write);