diff --git a/healthd/healthd_mode_charger.cpp b/healthd/healthd_mode_charger.cpp
index ec3de34..91774c6 100644
--- a/healthd/healthd_mode_charger.cpp
+++ b/healthd/healthd_mode_charger.cpp
@@ -30,6 +30,8 @@
 #include <time.h>
 #include <unistd.h>
 
+#include <functional>
+
 #include <android-base/file.h>
 #include <android-base/stringprintf.h>
 
@@ -42,6 +44,7 @@
 #include <cutils/misc.h>
 #include <cutils/uevent.h>
 #include <cutils/properties.h>
+#include <minui/minui.h>
 
 #ifdef CHARGER_ENABLE_SUSPEND
 #include <suspend/autosuspend.h>
@@ -49,7 +52,6 @@
 
 #include "animation.h"
 #include "AnimationParser.h"
-#include "minui/minui.h"
 
 #include <healthd/healthd.h>
 
@@ -568,9 +570,8 @@
     }
 }
 
-static int set_key_callback(int code, int value, void *data)
+static int set_key_callback(struct charger *charger, int code, int value)
 {
-    struct charger *charger = (struct charger *)data;
     int64_t now = curr_time_ms();
     int down = !!value;
 
@@ -605,7 +606,7 @@
 {
     if (ev->type != EV_KEY)
         return;
-    set_key_callback(ev->code, ev->value, charger);
+    set_key_callback(charger, ev->code, ev->value);
 }
 
 static void set_next_key_check(struct charger *charger,
@@ -762,9 +763,8 @@
    return (int)timeout;
 }
 
-static int input_callback(int fd, unsigned int epevents, void *data)
+static int input_callback(struct charger *charger, int fd, unsigned int epevents)
 {
-    struct charger *charger = (struct charger *)data;
     struct input_event ev;
     int ret;
 
@@ -841,7 +841,8 @@
 
     LOGW("--------------- STARTING CHARGER MODE ---------------\n");
 
-    ret = ev_init(input_callback, charger);
+    ret = ev_init(std::bind(&input_callback, charger, std::placeholders::_1,
+                            std::placeholders::_2));
     if (!ret) {
         epollfd = ev_get_epollfd();
         healthd_register_event(epollfd, charger_event_handler, EVENT_WAKEUP_FD);
@@ -880,7 +881,8 @@
             anim->frames[i].surface = scale_frames[i];
         }
     }
-    ev_sync_key_state(set_key_callback, charger);
+    ev_sync_key_state(std::bind(&set_key_callback, charger, std::placeholders::_1,
+                                std::placeholders::_2));
 
     charger->next_screen_transition = -1;
     charger->next_key_check = -1;