hm60x/hm801: Add hold button support.

Change-Id: I05557ecfbf0bd821d8966862a38f7f22656b36ef

firmware/target/arm/rk27xx/hm60x/button-hm60x.c

@@ -23,15 +23,40 @@
 #include "system.h"
 #include "button.h"
 #include "adc.h"
+#include "backlight.h"
 
 void button_init_device(void) {
     /* setup button gpio as input */
     GPIO_PCCON &= ~(POWEROFF_BUTTON);
+    GPIO_PACON &= ~(1);
+
+    /* setup button gpio as pulldown */
+    SCU_GPIOUPCON |= (1<<17) |
+                           1 ;
+}
+
+bool button_hold() {
+    return (GPIO_PADR & 1);
 }
 
 int button_read_device(void) {
     int adc_val = adc_read(ADC_BUTTONS);
     int gpio_btn = GPIO_PCDR & BUTTON_POWER;
+    static bool hold_button = false;
+    bool hold_button_old;
+    
+    hold_button_old = hold_button;
+    hold_button = button_hold();
+    
+#ifndef BOOTLOADER
+    if (hold_button != hold_button_old) {
+        backlight_hold_changed(hold_button);
+    }
+#endif
+
+    if (hold_button) {
+        return 0;
+    }
 
     if (adc_val < 380) { /* 0 - 379 */
         if (adc_val < 250) { /* 0 - 249 */

firmware/target/arm/rk27xx/hm60x/button-target.h

@@ -21,6 +21,8 @@
 #ifndef _BUTTON_TARGET_H_
 #define _BUTTON_TARGET_H_
 
+#define HAS_BUTTON_HOLD
+
 #define BUTTON_UP          0x00000001
 #define BUTTON_POWER       0x00000002
 #define BUTTON_DOWN        0x00000004

firmware/target/arm/rk27xx/hm801/button-hm801.c

@@ -23,6 +23,7 @@
 #include "system.h"
 #include "button.h"
 #include "adc.h"
+#include "backlight.h"
 
 enum keyboard_type_t {
     KEYBOARD_V1,
@@ -34,6 +35,12 @@ static enum keyboard_type_t kbd_type;
 void button_init_device(void) {
     /* setup button gpio as input */
     GPIO_PCCON &= ~(POWEROFF_BUTTON);
+    GPIO_PACON &= ~1;
+
+
+    /* setup button gpio as pulldown */
+    SCU_GPIOUPCON |= (1<<17) |
+                           1 ;
 
     /* identify keyboard type */
     SCU_IOMUXB_CON &= ~(1<<2);
@@ -45,6 +52,10 @@ void button_init_device(void) {
     }
 }
 
+bool button_hold() {
+    return (GPIO_PADR & 1);
+}
+
 static int button_read_device_v1(void) {
     int adc_val = adc_read(ADC_BUTTONS);
     int button =  0;
@@ -125,7 +136,21 @@ static int button_read_device_v2(void) {
 }
 
 int button_read_device(void) {
-    if (kbd_type == KEYBOARD_V1) {
+    static bool hold_button = false;
+    bool hold_button_old;
+
+    hold_button_old = hold_button;
+    hold_button = button_hold();
+
+#ifndef BOOTLOADER
+    if (hold_button != hold_button_old) {
+        backlight_hold_changed(hold_button);
+    }
+#endif
+    
+    if (hold_button) {
+        return 0;
+    } else if (kbd_type == KEYBOARD_V1) {
         return button_read_device_v1();
     } else {
         return button_read_device_v2();

firmware/target/arm/rk27xx/hm801/button-target.h

@@ -21,6 +21,8 @@
 #ifndef _BUTTON_TARGET_H_
 #define _BUTTON_TARGET_H_
 
+#define HAS_BUTTON_HOLD
+
 #define BUTTON_UP          0x00000001
 #define BUTTON_POWER       0x00000002
 #define BUTTON_DOWN        0x00000004