PWRCTL_DEV_HID
if (nvlist_lookup_string(attr_list, PWRCTL_DEV_HID, &dev_hid) != 0) {
err = nvlist_add_string(attr_list, PWRCTL_DEV_HID, hid);
PWRCTL_DEV_HID, EC_PWRCTL, ESC_PWRCTL_POWER_BUTTON);
err = nvlist_add_string(attr_list, PWRCTL_DEV_HID, devp->hid);
PWRCTL_DEV_HID, EC_PWRCTL, ev);