Add support for Sansa scrollwheel backlight. Turn light on when scrollwheel is in use, then back off again after a 5 second timeout.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11807 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 32 insertions, 1 deletions

diff --git a/firmware/target/arm/sandisk/sansa-e200/button-e200.c b/firmware/target/arm/sandisk/sansa-e200/button-e200.c
index 7a297885c0..0490c454c8 100644
--- a/firmware/target/arm/sandisk/sansa-e200/button-e200.c
+++ b/firmware/target/arm/sandisk/sansa-e200/button-e200.c
@@ -31,12 +31,29 @@
 static unsigned int old_wheel_value = 0;
 static unsigned int wheel_repeat = BUTTON_NONE;
 
+/* Wheel backlight control */
+#define WHEEL_BACKLIGHT_TIMEOUT 5*HZ;
+static unsigned int wheel_backlight_timer;
+
+void wheel_backlight_on(bool enable)
+{
+    if(enable)
+        GPIOG_OUTPUT_VAL |=0x80;
+    else
+        GPIOG_OUTPUT_VAL &=~ 0x80;
+}
+
 void button_init_device(void)
 {
     /* Enable all buttons */
     GPIOF_ENABLE |= 0xff;
     GPIOH_ENABLE |= 0xc0;
     
+    /* Scrollwheel light - enable control through GPIOG pin 7 and set timeout */
+    GPIOG_ENABLE = 0x80;
+    GPIOG_OUTPUT_EN |= 0x80;
+    wheel_backlight_timer = WHEEL_BACKLIGHT_TIMEOUT;
+    
     /* Read initial wheel value (bit 6-7 of GPIOH) */
     old_wheel_value = GPIOH_INPUT_VAL & 0xc0;
 }
@@ -137,6 +154,20 @@ int button_read_device(void)
         
         old_wheel_value = new_wheel_value;
     }
-
+    
+    if(wheel_backlight_timer>0){
+        wheel_backlight_timer--;
+        if(wheel_backlight_timer==0){
+            wheel_backlight_on(false);
+        }
+    }
+    
+    if( (btn & BUTTON_SCROLL_UP) || (btn & BUTTON_SCROLL_DOWN) ){
+        if(wheel_backlight_timer==0){
+            wheel_backlight_on(true);
+        }
+        wheel_backlight_timer = WHEEL_BACKLIGHT_TIMEOUT;
+    }
+    
     return btn;
 }