How can I customise listview data coming in?

what worked for me is
in the custom listview

I added this

function listViewProcess() {

        global $current_user;
        $this->processSearchForm();
        $this->params['custom_where'] = ' AND calls_cstm.interaction_status_c = "Open" AND calls.direction = "Inbound" ';

        if (empty($_REQUEST['search_form_only']) || $_REQUEST['search_form_only'] == false) {
            $this->lv->setup($this->seed, 'include/ListView/ListViewGeneric.tpl', $this->where, $this->params);
            $savedSearchName = empty($_REQUEST['saved_search_select_name']) ? '' : (' - ' . $_REQUEST['saved_search_select_name']);
            echo $this->lv->display();
        }
    }