Support for remote on Samsung YH920/YH925.

Remote buttons are bound to the standard buttons in button-target.h, but they can
have a separate buttonmap, if someone wants.

Change-Id: Id8c78a3dfec0005bf588dc16416870b4c7c56836

firmware/target/arm/pp/system-pp502x.c

@@ -154,6 +154,10 @@ void __attribute__((interrupt("IRQ"))) irq_handler(void)
         else if (CPU_HI_INT_STAT & GPIO0_MASK) {
             if (GPIOD_INT_STAT & 0x10)
                 usb_insert_int();
+#if !defined(SAMSUNG_YH820)
+            if (GPIOD_INT_STAT & 0x01)
+                remote_int();
+#endif
         }
 /* end SAMSUNG_YHxxx */
 #elif defined(PBELL_VIBE500)

firmware/target/arm/samsung/adc-target.h

@@ -28,14 +28,10 @@
 #define ADC_CHANNEL_2   2
 #define ADC_CHANNEL_3   3
 
+#define ADC_REMOTE      ADC_CHANNEL_0
 #define ADC_BATTERY     ADC_CHANNEL_1
-/*
-#define ADC_UNKNOWN_1   1
-#define ADC_REMOTE      2
-#define ADC_SCROLLPAD   3
-*/
-#define ADC_UNREG_POWER ADC_BATTERY /* For compatibility */
 
+#define ADC_UNREG_POWER ADC_BATTERY /* For compatibility */
 
 /* Force a scan now */
 unsigned short adc_scan(int channel);

firmware/target/arm/samsung/button-target.h

@@ -26,6 +26,10 @@
 
 /* Button codes for Samsung YH-820, 920, 925 */
 
+#if defined(SAMSUNG_YH920) || defined(SAMSUNG_YH925)
+void remote_int(void);
+#endif /* (SAMSUNG_YH920) || (SAMSUNG_YH925) */
+
 /* Main unit's buttons */
 /* Left = Menu, Right = Sel */
 #define BUTTON_LEFT         0x00000001
@@ -39,6 +43,12 @@
 
 #define BUTTON_MAIN         0x000000ff
 
+#define BUTTON_RC_PLUS      BUTTON_UP
+#define BUTTON_RC_MINUS     BUTTON_DOWN
+#define BUTTON_RC_PLAY      BUTTON_PLAY
+#define BUTTON_RC_REW       BUTTON_REW
+#define BUTTON_RC_FFWD      BUTTON_FFWD
+
 #define POWEROFF_BUTTON BUTTON_PLAY
 #define POWEROFF_COUNT  15
 

firmware/target/arm/samsung/button-yh82x_yh92x.c

@@ -22,12 +22,65 @@
 #include "system.h"
 #include "button.h"
 #include "backlight.h"
+#if defined(SAMSUNG_YH920) || defined(SAMSUNG_YH925)
+#include "adc.h"
+
+static int int_btn = BUTTON_NONE;
 
 void button_init_device(void)
 {
-    /* TODO...for now, hardware initialisation is done by the OF bootloader */
+    /* remote interrupt - low when key is pressed */
+    GPIOD_ENABLE |= 0x01;
+    GPIOD_OUTPUT_EN &= ~0x01;
+
+    /* disable/reset int */
+    GPIOD_INT_EN  &= ~0x01;
+    GPIOD_INT_CLR |=  0x01;
+
+    /* enable int */
+    GPIOD_INT_LEV &= ~0x01;
+    GPIOD_INT_EN  |=  0x01;
+
+    /* remote PLAY */
+    GPIOD_ENABLE |= 0x02;
+    GPIOD_OUTPUT_EN &= ~0x02;
 }
 
+/* Remote buttons */
+void remote_int(void)
+{
+    int state = 0x01 & ~GPIOD_INPUT_VAL;
+
+    GPIO_CLEAR_BITWISE(GPIOD_INT_EN, 0x01);
+    GPIO_WRITE_BITWISE(GPIOD_INT_LEV, state, 0x01);
+
+    if (state != 0)
+    {
+        /* necessary delay 1msec */
+        udelay(1000);
+        unsigned int val = adc_scan(ADC_REMOTE);
+        if (val > 750) int_btn = BUTTON_RC_MINUS;
+        else
+        if (val > 375) int_btn = BUTTON_RC_PLUS;
+        else
+        if (val > 100) int_btn = BUTTON_RC_REW;
+        else
+        int_btn = BUTTON_RC_FFWD;
+    }
+    else
+    int_btn = BUTTON_NONE;
+
+    GPIO_SET_BITWISE(GPIOD_INT_CLR, 0x01);
+    GPIO_SET_BITWISE(GPIOD_INT_EN, 0x01);
+}
+#else
+void button_init_device(void)
+{
+    /* nothing */
+}
+#endif /* (SAMSUNG_YH920) || (SAMSUNG_YH925) */
+
+
 bool button_hold(void)
 {
     return (~GPIOA_INPUT_VAL & 0x1);
@@ -38,7 +91,11 @@ bool button_hold(void)
  */
 int button_read_device(void)
 {
+#if defined(SAMSUNG_YH920) || defined(SAMSUNG_YH925)
+    int btn = int_btn;
+#else
     int btn = BUTTON_NONE;
+#endif /* (SAMSUNG_YH920) || (SAMSUNG_YH925) */
     static bool hold_button = false;
     bool hold_button_old;
 
@@ -65,6 +122,7 @@ int button_read_device(void)
         if ( GPIOB_INPUT_VAL & 0x80) btn |= BUTTON_PLAY;
 #elif defined(SAMSUNG_YH920) || defined(SAMSUNG_YH925)
         if ( GPIOD_INPUT_VAL & 0x04) btn |= BUTTON_PLAY;
+        if ( GPIOD_INPUT_VAL & 0x02) btn |= BUTTON_RC_PLAY; /* Remote PLAY */
 #endif
     }