332 lines
6.7 KiB
C
332 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* E3C EC100 demodulator driver
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*
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* Copyright (C) 2009 Antti Palosaari <crope@iki.fi>
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*/
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#include <media/dvb_frontend.h>
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#include "ec100.h"
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struct ec100_state {
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struct i2c_adapter *i2c;
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struct dvb_frontend frontend;
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struct ec100_config config;
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u16 ber;
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};
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/* write single register */
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static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val)
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{
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int ret;
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u8 buf[2] = {reg, val};
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struct i2c_msg msg[1] = {
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{
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.addr = state->config.demod_address,
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.flags = 0,
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.len = sizeof(buf),
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.buf = buf,
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}
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};
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ret = i2c_transfer(state->i2c, msg, 1);
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if (ret == 1) {
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ret = 0;
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} else {
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dev_warn(&state->i2c->dev, "%s: i2c wr failed=%d reg=%02x\n",
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KBUILD_MODNAME, ret, reg);
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ret = -EREMOTEIO;
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}
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return ret;
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}
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/* read single register */
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static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)
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{
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int ret;
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struct i2c_msg msg[2] = {
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{
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.addr = state->config.demod_address,
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.flags = 0,
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.len = 1,
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.buf = ®
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}, {
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.addr = state->config.demod_address,
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.flags = I2C_M_RD,
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.len = 1,
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.buf = val
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}
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};
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ret = i2c_transfer(state->i2c, msg, 2);
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if (ret == 2) {
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ret = 0;
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} else {
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dev_warn(&state->i2c->dev, "%s: i2c rd failed=%d reg=%02x\n",
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KBUILD_MODNAME, ret, reg);
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ret = -EREMOTEIO;
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}
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return ret;
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}
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static int ec100_set_frontend(struct dvb_frontend *fe)
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{
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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struct ec100_state *state = fe->demodulator_priv;
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int ret;
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u8 tmp, tmp2;
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dev_dbg(&state->i2c->dev, "%s: frequency=%d bandwidth_hz=%d\n",
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__func__, c->frequency, c->bandwidth_hz);
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/* program tuner */
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if (fe->ops.tuner_ops.set_params)
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fe->ops.tuner_ops.set_params(fe);
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ret = ec100_write_reg(state, 0x04, 0x06);
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if (ret)
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goto error;
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ret = ec100_write_reg(state, 0x67, 0x58);
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if (ret)
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goto error;
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ret = ec100_write_reg(state, 0x05, 0x18);
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if (ret)
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goto error;
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/* reg/bw | 6 | 7 | 8
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-------+------+------+------
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A 0x1b | 0xa1 | 0xe7 | 0x2c
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A 0x1c | 0x55 | 0x63 | 0x72
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-------+------+------+------
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B 0x1b | 0xb7 | 0x00 | 0x49
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B 0x1c | 0x55 | 0x64 | 0x72 */
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switch (c->bandwidth_hz) {
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case 6000000:
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tmp = 0xb7;
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tmp2 = 0x55;
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break;
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case 7000000:
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tmp = 0x00;
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tmp2 = 0x64;
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break;
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case 8000000:
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default:
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tmp = 0x49;
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tmp2 = 0x72;
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}
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ret = ec100_write_reg(state, 0x1b, tmp);
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if (ret)
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goto error;
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ret = ec100_write_reg(state, 0x1c, tmp2);
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if (ret)
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goto error;
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ret = ec100_write_reg(state, 0x0c, 0xbb); /* if freq */
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if (ret)
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goto error;
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ret = ec100_write_reg(state, 0x0d, 0x31); /* if freq */
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if (ret)
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goto error;
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ret = ec100_write_reg(state, 0x08, 0x24);
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if (ret)
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goto error;
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ret = ec100_write_reg(state, 0x00, 0x00); /* go */
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if (ret)
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goto error;
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ret = ec100_write_reg(state, 0x00, 0x20); /* go */
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if (ret)
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goto error;
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return ret;
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error:
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dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
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return ret;
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}
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static int ec100_get_tune_settings(struct dvb_frontend *fe,
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struct dvb_frontend_tune_settings *fesettings)
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{
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fesettings->min_delay_ms = 300;
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fesettings->step_size = 0;
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fesettings->max_drift = 0;
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return 0;
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}
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static int ec100_read_status(struct dvb_frontend *fe, enum fe_status *status)
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{
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struct ec100_state *state = fe->demodulator_priv;
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int ret;
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u8 tmp;
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*status = 0;
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ret = ec100_read_reg(state, 0x42, &tmp);
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if (ret)
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goto error;
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if (tmp & 0x80) {
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/* bit7 set - have lock */
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*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
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FE_HAS_SYNC | FE_HAS_LOCK;
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} else {
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ret = ec100_read_reg(state, 0x01, &tmp);
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if (ret)
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goto error;
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if (tmp & 0x10) {
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/* bit4 set - have signal */
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*status |= FE_HAS_SIGNAL;
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if (!(tmp & 0x01)) {
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/* bit0 clear - have ~valid signal */
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*status |= FE_HAS_CARRIER | FE_HAS_VITERBI;
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}
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}
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}
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return ret;
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error:
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dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
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return ret;
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}
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static int ec100_read_ber(struct dvb_frontend *fe, u32 *ber)
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{
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struct ec100_state *state = fe->demodulator_priv;
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int ret;
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u8 tmp, tmp2;
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u16 ber2;
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*ber = 0;
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ret = ec100_read_reg(state, 0x65, &tmp);
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if (ret)
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goto error;
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ret = ec100_read_reg(state, 0x66, &tmp2);
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if (ret)
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goto error;
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ber2 = (tmp2 << 8) | tmp;
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/* if counter overflow or clear */
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if (ber2 < state->ber)
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*ber = ber2;
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else
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*ber = ber2 - state->ber;
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state->ber = ber2;
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return ret;
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error:
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dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
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return ret;
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}
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static int ec100_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
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{
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struct ec100_state *state = fe->demodulator_priv;
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int ret;
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u8 tmp;
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ret = ec100_read_reg(state, 0x24, &tmp);
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if (ret) {
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*strength = 0;
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goto error;
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}
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*strength = ((tmp << 8) | tmp);
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return ret;
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error:
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dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
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return ret;
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}
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static int ec100_read_snr(struct dvb_frontend *fe, u16 *snr)
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{
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*snr = 0;
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return 0;
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}
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static int ec100_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
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{
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*ucblocks = 0;
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return 0;
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}
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static void ec100_release(struct dvb_frontend *fe)
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{
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struct ec100_state *state = fe->demodulator_priv;
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kfree(state);
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}
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static const struct dvb_frontend_ops ec100_ops;
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struct dvb_frontend *ec100_attach(const struct ec100_config *config,
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struct i2c_adapter *i2c)
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{
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int ret;
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struct ec100_state *state = NULL;
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u8 tmp;
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/* allocate memory for the internal state */
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state = kzalloc(sizeof(struct ec100_state), GFP_KERNEL);
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if (state == NULL)
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goto error;
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/* setup the state */
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state->i2c = i2c;
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memcpy(&state->config, config, sizeof(struct ec100_config));
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/* check if the demod is there */
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ret = ec100_read_reg(state, 0x33, &tmp);
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if (ret || tmp != 0x0b)
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goto error;
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/* create dvb_frontend */
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memcpy(&state->frontend.ops, &ec100_ops,
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sizeof(struct dvb_frontend_ops));
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state->frontend.demodulator_priv = state;
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return &state->frontend;
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error:
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kfree(state);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(ec100_attach);
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static const struct dvb_frontend_ops ec100_ops = {
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.delsys = { SYS_DVBT },
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.info = {
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.name = "E3C EC100 DVB-T",
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.caps =
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FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
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FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
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FE_CAN_QPSK | FE_CAN_QAM_16 |
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FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
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FE_CAN_TRANSMISSION_MODE_AUTO |
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FE_CAN_GUARD_INTERVAL_AUTO |
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FE_CAN_HIERARCHY_AUTO |
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FE_CAN_MUTE_TS
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},
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.release = ec100_release,
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.set_frontend = ec100_set_frontend,
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.get_tune_settings = ec100_get_tune_settings,
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.read_status = ec100_read_status,
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.read_ber = ec100_read_ber,
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.read_signal_strength = ec100_read_signal_strength,
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.read_snr = ec100_read_snr,
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.read_ucblocks = ec100_read_ucblocks,
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};
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MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
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MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver");
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MODULE_LICENSE("GPL");
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