fiiom3k_linux: Enable HAVE_TOUCHPAD and add in missing bits

Change-Id: I78fa5fdb3648adfaa40f6d5f3c255666a85e2761

firmware/export/config/fiiom3klinux.h

@@ -51,6 +51,9 @@
 #define HAVE_BUTTON_LIGHT
 #define HAVE_BUTTONLIGHT_BRIGHTNESS
 
+/* We have a touchpad */
+#define HAVE_TOUCHPAD
+
 /* Main LCD backlight brightness range and defaults: the backlight driver
  * has levels from 0 to 32. But 0 is off so start at 1.
  */

firmware/target/hosted/fiio/button-fiio.c

@@ -46,6 +46,8 @@ static int key_up_delay = 0;
 static int key_down_delay = 0;
 static int key_f12_delay = 0;
 
+static int tp_enabled = 1;
+
 #define NR_POLL_DESC	2
 static struct pollfd poll_fds[NR_POLL_DESC];
 
@@ -236,6 +238,11 @@ void button_init_device(void)
     }
 }
 
+void touchpad_enable_device(bool en)
+{
+    tp_enabled = en;
+}
+
 int button_read_device(void)
 {
     static int button_bitmap = 0;
@@ -247,6 +254,9 @@ int button_read_device(void)
     {
         for(int i = 0; i < NR_POLL_DESC; i++)
         {
+            if (i == 1 && !tp_enabled) /* Ignore touchpad ? */
+               continue;
+
             /* read only if non-blocking */
             if(poll_fds[i].revents & POLLIN)
             {

firmware/target/hosted/fiio/button-target.h

@@ -39,8 +39,14 @@
 #define BUTTON_LEFT      BUTTON_PREV
 #define BUTTON_RIGHT     BUTTON_NEXT
 
+#define BUTTON_TOUCHPAD (BUTTON_UP|BUTTON_DOWN|BUTTON_PREV|BUTTON_NEXT|\
+                         BUTTON_HOME|BUTTON_OPTION)
+
 /* Software power-off */
 #define POWEROFF_BUTTON BUTTON_POWER
 #define POWEROFF_COUNT  25
 
+void touchpad_enable_device(bool en);
+
+
 #endif /* _BUTTON_TARGET_H_ */