diff options
Diffstat (limited to 'drivers/media/dvb/frontends/ec100.c')
| -rw-r--r-- | drivers/media/dvb/frontends/ec100.c | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/ec100.c b/drivers/media/dvb/frontends/ec100.c new file mode 100644 index 0000000..2414dc6 --- /dev/null +++ b/drivers/media/dvb/frontends/ec100.c @@ -0,0 +1,335 @@ +/* + * E3C EC100 demodulator driver + * + * Copyright (C) 2009 Antti Palosaari <crope@iki.fi> + * + * 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 "dvb_frontend.h" +#include "ec100_priv.h" +#include "ec100.h" + +int ec100_debug; +module_param_named(debug, ec100_debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); + +struct ec100_state { + struct i2c_adapter *i2c; + struct dvb_frontend frontend; + struct ec100_config config; + + u16 ber; +}; + +/* write single register */ +static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val) +{ + u8 buf[2] = {reg, val}; + struct i2c_msg msg = { + .addr = state->config.demod_address, + .flags = 0, + .len = 2, + .buf = buf}; + + if (i2c_transfer(state->i2c, &msg, 1) != 1) { + warn("I2C write failed reg:%02x", reg); + return -EREMOTEIO; + } + return 0; +} + +/* read single register */ +static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val) +{ + struct i2c_msg msg[2] = { + { + .addr = state->config.demod_address, + .flags = 0, + .len = 1, + .buf = ® + }, { + .addr = state->config.demod_address, + .flags = I2C_M_RD, + .len = 1, + .buf = val + } + }; + + if (i2c_transfer(state->i2c, msg, 2) != 2) { + warn("I2C read failed reg:%02x", reg); + return -EREMOTEIO; + } + return 0; +} + +static int ec100_set_frontend(struct dvb_frontend *fe, + struct dvb_frontend_parameters *params) +{ + struct ec100_state *state = fe->demodulator_priv; + int ret; + u8 tmp, tmp2; + + deb_info("%s: freq:%d bw:%d\n", __func__, params->frequency, + params->u.ofdm.bandwidth); + + /* program tuner */ + if (fe->ops.tuner_ops.set_params) + fe->ops.tuner_ops.set_params(fe, params); + + ret = ec100_write_reg(state, 0x04, 0x06); + if (ret) + goto error; + ret = ec100_write_reg(state, 0x67, 0x58); + if (ret) + goto error; + ret = ec100_write_reg(state, 0x05, 0x18); + if (ret) + goto error; + + /* reg/bw | 6 | 7 | 8 + -------+------+------+------ + A 0x1b | 0xa1 | 0xe7 | 0x2c + A 0x1c | 0x55 | 0x63 | 0x72 + -------+------+------+------ + B 0x1b | 0xb7 | 0x00 | 0x49 + B 0x1c | 0x55 | 0x64 | 0x72 */ + + switch (params->u.ofdm.bandwidth) { + case BANDWIDTH_6_MHZ: + tmp = 0xb7; + tmp2 = 0x55; + break; + case BANDWIDTH_7_MHZ: + tmp = 0x00; + tmp2 = 0x64; + break; + case BANDWIDTH_8_MHZ: + default: + tmp = 0x49; + tmp2 = 0x72; + } + + ret = ec100_write_reg(state, 0x1b, tmp); + if (ret) + goto error; + ret = ec100_write_reg(state, 0x1c, tmp2); + if (ret) + goto error; + + ret = ec100_write_reg(state, 0x0c, 0xbb); /* if freq */ + if (ret) + goto error; + ret = ec100_write_reg(state, 0x0d, 0x31); /* if freq */ + if (ret) + goto error; + + ret = ec100_write_reg(state, 0x08, 0x24); + if (ret) + goto error; + + ret = ec100_write_reg(state, 0x00, 0x00); /* go */ + if (ret) + goto error; + ret = ec100_write_reg(state, 0x00, 0x20); /* go */ + if (ret) + goto error; + + return ret; +error: + deb_info("%s: failed:%d\n", __func__, ret); + return ret; +} + +static int ec100_get_tune_settings(struct dvb_frontend *fe, + struct dvb_frontend_tune_settings *fesettings) +{ + fesettings->min_delay_ms = 300; + fesettings->step_size = 0; + fesettings->max_drift = 0; + + return 0; +} + +static int ec100_read_status(struct dvb_frontend *fe, fe_status_t *status) +{ + struct ec100_state *state = fe->demodulator_priv; + int ret; + u8 tmp; + *status = 0; + + ret = ec100_read_reg(state, 0x42, &tmp); + if (ret) + goto error; + + if (tmp & 0x80) { + /* bit7 set - have lock */ + *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI | + FE_HAS_SYNC | FE_HAS_LOCK; + } else { + ret = ec100_read_reg(state, 0x01, &tmp); + if (ret) + goto error; + + if (tmp & 0x10) { + /* bit4 set - have signal */ + *status |= FE_HAS_SIGNAL; + if (!(tmp & 0x01)) { + /* bit0 clear - have ~valid signal */ + *status |= FE_HAS_CARRIER | FE_HAS_VITERBI; + } + } + } + + return ret; +error: + deb_info("%s: failed:%d\n", __func__, ret); + return ret; +} + +static int ec100_read_ber(struct dvb_frontend *fe, u32 *ber) +{ + struct ec100_state *state = fe->demodulator_priv; + int ret; + u8 tmp, tmp2; + u16 ber2; + + *ber = 0; + + ret = ec100_read_reg(state, 0x65, &tmp); + if (ret) + goto error; + ret = ec100_read_reg(state, 0x66, &tmp2); + if (ret) + goto error; + + ber2 = (tmp2 << 8) | tmp; + + /* if counter overflow or clear */ + if (ber2 < state->ber) + *ber = ber2; + else + *ber = ber2 - state->ber; + + state->ber = ber2; + + return ret; +error: + deb_info("%s: failed:%d\n", __func__, ret); + return ret; +} + +static int ec100_read_signal_strength(struct dvb_frontend *fe, u16 *strength) +{ + struct ec100_state *state = fe->demodulator_priv; + int ret; + u8 tmp; + + ret = ec100_read_reg(state, 0x24, &tmp); + if (ret) { + *strength = 0; + goto error; + } + + *strength = ((tmp << 8) | tmp); + + return ret; +error: + deb_info("%s: failed:%d\n", __func__, ret); + return ret; +} + +static int ec100_read_snr(struct dvb_frontend *fe, u16 *snr) +{ + *snr = 0; + return 0; +} + +static int ec100_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) +{ + *ucblocks = 0; + return 0; +} + +static void ec100_release(struct dvb_frontend *fe) +{ + struct ec100_state *state = fe->demodulator_priv; + kfree(state); +} + +static struct dvb_frontend_ops ec100_ops; + +struct dvb_frontend *ec100_attach(const struct ec100_config *config, + struct i2c_adapter *i2c) +{ + int ret; + struct ec100_state *state = NULL; + u8 tmp; + + /* allocate memory for the internal state */ + state = kzalloc(sizeof(struct ec100_state), GFP_KERNEL); + if (state == NULL) + goto error; + + /* setup the state */ + state->i2c = i2c; + memcpy(&state->config, config, sizeof(struct ec100_config)); + + /* check if the demod is there */ + ret = ec100_read_reg(state, 0x33, &tmp); + if (ret || tmp != 0x0b) + goto error; + + /* create dvb_frontend */ + memcpy(&state->frontend.ops, &ec100_ops, + sizeof(struct dvb_frontend_ops)); + state->frontend.demodulator_priv = state; + + return &state->frontend; +error: + kfree(state); + return NULL; +} +EXPORT_SYMBOL(ec100_attach); + +static struct dvb_frontend_ops ec100_ops = { + .info = { + .name = "E3C EC100 DVB-T", + .type = FE_OFDM, + .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_TRANSMISSION_MODE_AUTO | + FE_CAN_GUARD_INTERVAL_AUTO | + FE_CAN_HIERARCHY_AUTO | + FE_CAN_MUTE_TS + }, + + .release = ec100_release, + .set_frontend = ec100_set_frontend, + .get_tune_settings = ec100_get_tune_settings, + .read_status = ec100_read_status, + .read_ber = ec100_read_ber, + .read_signal_strength = ec100_read_signal_strength, + .read_snr = ec100_read_snr, + .read_ucblocks = ec100_read_ucblocks, +}; + +MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); +MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver"); +MODULE_LICENSE("GPL"); |
