init_input
int (*init_input)(struct i2c_client *client);
err = ts_data->chip->init_input(client);
.init_input = &cst3xx_input_dev_int,
init_input(codec, spec->input_pins[i], spec->adcs[i]);
init_input(codec, cfg->dig_in_pin, spec->dig_in);
init_input(codec, cfg->dig_in_pin, spec->dig_in);
init_input(codec, spec->input_pins[i], spec->adcs[i]);