// SPDX-License-Identifier: GPL-2.0-or-later
/*
* E3C EC100 demodulator driver
*
* Copyright (C) 2009 Antti Palosaari <[email protected]>
*/
#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 <[email protected]>");
MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver");
MODULE_LICENSE("GPL");
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