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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * E3C EC100 demodulator driver4 *5 * Copyright (C) 2009 Antti Palosaari <crope@iki.fi>6 */7 8#include <media/dvb_frontend.h>9#include "ec100.h"10 11struct ec100_state {12 struct i2c_adapter *i2c;13 struct dvb_frontend frontend;14 struct ec100_config config;15 16 u16 ber;17};18 19/* write single register */20static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val)21{22 int ret;23 u8 buf[2] = {reg, val};24 struct i2c_msg msg[1] = {25 {26 .addr = state->config.demod_address,27 .flags = 0,28 .len = sizeof(buf),29 .buf = buf,30 }31 };32 33 ret = i2c_transfer(state->i2c, msg, 1);34 if (ret == 1) {35 ret = 0;36 } else {37 dev_warn(&state->i2c->dev, "%s: i2c wr failed=%d reg=%02x\n",38 KBUILD_MODNAME, ret, reg);39 ret = -EREMOTEIO;40 }41 42 return ret;43}44 45/* read single register */46static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)47{48 int ret;49 struct i2c_msg msg[2] = {50 {51 .addr = state->config.demod_address,52 .flags = 0,53 .len = 1,54 .buf = ®55 }, {56 .addr = state->config.demod_address,57 .flags = I2C_M_RD,58 .len = 1,59 .buf = val60 }61 };62 63 ret = i2c_transfer(state->i2c, msg, 2);64 if (ret == 2) {65 ret = 0;66 } else {67 dev_warn(&state->i2c->dev, "%s: i2c rd failed=%d reg=%02x\n",68 KBUILD_MODNAME, ret, reg);69 ret = -EREMOTEIO;70 }71 72 return ret;73}74 75static int ec100_set_frontend(struct dvb_frontend *fe)76{77 struct dtv_frontend_properties *c = &fe->dtv_property_cache;78 struct ec100_state *state = fe->demodulator_priv;79 int ret;80 u8 tmp, tmp2;81 82 dev_dbg(&state->i2c->dev, "%s: frequency=%d bandwidth_hz=%d\n",83 __func__, c->frequency, c->bandwidth_hz);84 85 /* program tuner */86 if (fe->ops.tuner_ops.set_params)87 fe->ops.tuner_ops.set_params(fe);88 89 ret = ec100_write_reg(state, 0x04, 0x06);90 if (ret)91 goto error;92 ret = ec100_write_reg(state, 0x67, 0x58);93 if (ret)94 goto error;95 ret = ec100_write_reg(state, 0x05, 0x18);96 if (ret)97 goto error;98 99 /* reg/bw | 6 | 7 | 8100 -------+------+------+------101 A 0x1b | 0xa1 | 0xe7 | 0x2c102 A 0x1c | 0x55 | 0x63 | 0x72103 -------+------+------+------104 B 0x1b | 0xb7 | 0x00 | 0x49105 B 0x1c | 0x55 | 0x64 | 0x72 */106 107 switch (c->bandwidth_hz) {108 case 6000000:109 tmp = 0xb7;110 tmp2 = 0x55;111 break;112 case 7000000:113 tmp = 0x00;114 tmp2 = 0x64;115 break;116 case 8000000:117 default:118 tmp = 0x49;119 tmp2 = 0x72;120 }121 122 ret = ec100_write_reg(state, 0x1b, tmp);123 if (ret)124 goto error;125 ret = ec100_write_reg(state, 0x1c, tmp2);126 if (ret)127 goto error;128 129 ret = ec100_write_reg(state, 0x0c, 0xbb); /* if freq */130 if (ret)131 goto error;132 ret = ec100_write_reg(state, 0x0d, 0x31); /* if freq */133 if (ret)134 goto error;135 136 ret = ec100_write_reg(state, 0x08, 0x24);137 if (ret)138 goto error;139 140 ret = ec100_write_reg(state, 0x00, 0x00); /* go */141 if (ret)142 goto error;143 ret = ec100_write_reg(state, 0x00, 0x20); /* go */144 if (ret)145 goto error;146 147 return ret;148error:149 dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);150 return ret;151}152 153static int ec100_get_tune_settings(struct dvb_frontend *fe,154 struct dvb_frontend_tune_settings *fesettings)155{156 fesettings->min_delay_ms = 300;157 fesettings->step_size = 0;158 fesettings->max_drift = 0;159 160 return 0;161}162 163static int ec100_read_status(struct dvb_frontend *fe, enum fe_status *status)164{165 struct ec100_state *state = fe->demodulator_priv;166 int ret;167 u8 tmp;168 *status = 0;169 170 ret = ec100_read_reg(state, 0x42, &tmp);171 if (ret)172 goto error;173 174 if (tmp & 0x80) {175 /* bit7 set - have lock */176 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |177 FE_HAS_SYNC | FE_HAS_LOCK;178 } else {179 ret = ec100_read_reg(state, 0x01, &tmp);180 if (ret)181 goto error;182 183 if (tmp & 0x10) {184 /* bit4 set - have signal */185 *status |= FE_HAS_SIGNAL;186 if (!(tmp & 0x01)) {187 /* bit0 clear - have ~valid signal */188 *status |= FE_HAS_CARRIER | FE_HAS_VITERBI;189 }190 }191 }192 193 return ret;194error:195 dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);196 return ret;197}198 199static int ec100_read_ber(struct dvb_frontend *fe, u32 *ber)200{201 struct ec100_state *state = fe->demodulator_priv;202 int ret;203 u8 tmp, tmp2;204 u16 ber2;205 206 *ber = 0;207 208 ret = ec100_read_reg(state, 0x65, &tmp);209 if (ret)210 goto error;211 ret = ec100_read_reg(state, 0x66, &tmp2);212 if (ret)213 goto error;214 215 ber2 = (tmp2 << 8) | tmp;216 217 /* if counter overflow or clear */218 if (ber2 < state->ber)219 *ber = ber2;220 else221 *ber = ber2 - state->ber;222 223 state->ber = ber2;224 225 return ret;226error:227 dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);228 return ret;229}230 231static int ec100_read_signal_strength(struct dvb_frontend *fe, u16 *strength)232{233 struct ec100_state *state = fe->demodulator_priv;234 int ret;235 u8 tmp;236 237 ret = ec100_read_reg(state, 0x24, &tmp);238 if (ret) {239 *strength = 0;240 goto error;241 }242 243 *strength = ((tmp << 8) | tmp);244 245 return ret;246error:247 dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);248 return ret;249}250 251static int ec100_read_snr(struct dvb_frontend *fe, u16 *snr)252{253 *snr = 0;254 return 0;255}256 257static int ec100_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)258{259 *ucblocks = 0;260 return 0;261}262 263static void ec100_release(struct dvb_frontend *fe)264{265 struct ec100_state *state = fe->demodulator_priv;266 kfree(state);267}268 269static const struct dvb_frontend_ops ec100_ops;270 271struct dvb_frontend *ec100_attach(const struct ec100_config *config,272 struct i2c_adapter *i2c)273{274 int ret;275 struct ec100_state *state = NULL;276 u8 tmp;277 278 /* allocate memory for the internal state */279 state = kzalloc(sizeof(struct ec100_state), GFP_KERNEL);280 if (state == NULL)281 goto error;282 283 /* setup the state */284 state->i2c = i2c;285 memcpy(&state->config, config, sizeof(struct ec100_config));286 287 /* check if the demod is there */288 ret = ec100_read_reg(state, 0x33, &tmp);289 if (ret || tmp != 0x0b)290 goto error;291 292 /* create dvb_frontend */293 memcpy(&state->frontend.ops, &ec100_ops,294 sizeof(struct dvb_frontend_ops));295 state->frontend.demodulator_priv = state;296 297 return &state->frontend;298error:299 kfree(state);300 return NULL;301}302EXPORT_SYMBOL_GPL(ec100_attach);303 304static const struct dvb_frontend_ops ec100_ops = {305 .delsys = { SYS_DVBT },306 .info = {307 .name = "E3C EC100 DVB-T",308 .caps =309 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |310 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |311 FE_CAN_QPSK | FE_CAN_QAM_16 |312 FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |313 FE_CAN_TRANSMISSION_MODE_AUTO |314 FE_CAN_GUARD_INTERVAL_AUTO |315 FE_CAN_HIERARCHY_AUTO |316 FE_CAN_MUTE_TS317 },318 319 .release = ec100_release,320 .set_frontend = ec100_set_frontend,321 .get_tune_settings = ec100_get_tune_settings,322 .read_status = ec100_read_status,323 .read_ber = ec100_read_ber,324 .read_signal_strength = ec100_read_signal_strength,325 .read_snr = ec100_read_snr,326 .read_ucblocks = ec100_read_ucblocks,327};328 329MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");330MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver");331MODULE_LICENSE("GPL");332