diff options
Diffstat (limited to 'drivers/media/dvb-frontends/ec100.c')
| -rw-r--r-- | drivers/media/dvb-frontends/ec100.c | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/ec100.c b/drivers/media/dvb-frontends/ec100.c new file mode 100644 index 0000000000..2ad0a3c2f7 --- /dev/null +++ b/drivers/media/dvb-frontends/ec100.c @@ -0,0 +1,331 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * E3C EC100 demodulator driver + * + * Copyright (C) 2009 Antti Palosaari <crope@iki.fi> + */ + +#include <media/dvb_frontend.h> +#include "ec100.h" + +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) +{ + int ret; + u8 buf[2] = {reg, val}; + struct i2c_msg msg[1] = { + { + .addr = state->config.demod_address, + .flags = 0, + .len = sizeof(buf), + .buf = buf, + } + }; + + ret = i2c_transfer(state->i2c, msg, 1); + if (ret == 1) { + ret = 0; + } else { + dev_warn(&state->i2c->dev, "%s: i2c wr failed=%d reg=%02x\n", + KBUILD_MODNAME, ret, reg); + ret = -EREMOTEIO; + } + + return ret; +} + +/* read single register */ +static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val) +{ + int ret; + 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 + } + }; + + ret = i2c_transfer(state->i2c, msg, 2); + if (ret == 2) { + ret = 0; + } else { + dev_warn(&state->i2c->dev, "%s: i2c rd failed=%d reg=%02x\n", + KBUILD_MODNAME, ret, reg); + ret = -EREMOTEIO; + } + + return ret; +} + +static int ec100_set_frontend(struct dvb_frontend *fe) +{ + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + struct ec100_state *state = fe->demodulator_priv; + int ret; + u8 tmp, tmp2; + + dev_dbg(&state->i2c->dev, "%s: frequency=%d bandwidth_hz=%d\n", + __func__, c->frequency, c->bandwidth_hz); + + /* program tuner */ + if (fe->ops.tuner_ops.set_params) + fe->ops.tuner_ops.set_params(fe); + + 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 (c->bandwidth_hz) { + case 6000000: + tmp = 0xb7; + tmp2 = 0x55; + break; + case 7000000: + tmp = 0x00; + tmp2 = 0x64; + break; + case 8000000: + 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: + dev_dbg(&state->i2c->dev, "%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, enum fe_status *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: + dev_dbg(&state->i2c->dev, "%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: + dev_dbg(&state->i2c->dev, "%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: + dev_dbg(&state->i2c->dev, "%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 const 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_GPL(ec100_attach); + +static const struct dvb_frontend_ops ec100_ops = { + .delsys = { SYS_DVBT }, + .info = { + .name = "E3C EC100 DVB-T", + .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"); |