turn backlight off on "poweroff" state

src/main.c

@@ -1,4 +1,5 @@
 #include <gint/display.h>
+#include <gint/drivers/r61524.h>
 #include <gint/gint.h>
 #include <gint/keyboard.h>
 #include <gint/timer.h>
@@ -32,11 +33,14 @@ static int callback_keypoll(void) {
     return TIMER_STOP;
 }
 
+extern void _set_backlight(char level);
+
 int main(void) {
     int tick_ctr = 0;
     int shift_state = 0;
     int alpha_state = 0;
     int off_state = 0;
+    uint16_t backlight_save;
 
     set_statusbar(tick_ctr, shift_state, alpha_state, get_battery_voltage());
     set_menubar();
@@ -52,6 +56,9 @@ int main(void) {
             if (off_state) {
                 if (kev.key == KEY_ACON) {
                     off_state = 0;
+
+                    // reset backlight
+                    r61524_set(0x5a1, backlight_save & 0x00ff);
                 } else {
                     continue;
                 }
@@ -66,8 +73,9 @@ int main(void) {
             if (kev.key == KEY_ACON && shift_state) {
                 off_state = 1;
 
-                dclear(C_BLACK);
-                dupdate();
+                // turn backlight off
+                backlight_save = r61524_get(0x5a1) & 0x00ff;
+                r61524_set(0x5a1, 0);
 
                 shift_state = 0;
                 alpha_state = 0;

src/syscalls.S

@@ -1,6 +1,7 @@
 .global __poweroff
 .global __battery
 .global __battery_type
+.global __set_backlight
 
 .section ".text"
 
@@ -30,6 +31,9 @@ __battery:
 __battery_type:
     syscall(0x12d5)
 
+__set_backlight:
+    syscall(0x0199)
+
 syscall_table:
     .long 0x80020070