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331 lines
6.7 KiB
331 lines
6.7 KiB
// 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 <[email protected]> |
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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(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 <[email protected]>"); |
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MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver"); |
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MODULE_LICENSE("GPL");
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