ec_read_reg
ret = ec_read_reg(reg_hi, &oldh);
ret = ec_read_reg(reg_lo, &lo);
ret = ec_read_reg(reg_hi, &newh);
ret = ec_read_reg(reg_lo, &lo);
ret = ec_read_reg(channel == 0 ? EC_REG_TEMP_BOARD
ret = ec_read_reg(EC_REG_FAN_DUTY, &test);