VIM4 does not have an IR receiver. If you require this feature, you will have to attach an IR receiver to the 40-Pin Header, and additional software configurations are required.

This document guides you to add IR input keys on Android.

IR_IN (infrared signal input) is PIN_39 or GPIOD_15 on the 40-pin GPIO header.

Add the IR remote configuration to the common/arch/arm64/boot/dts/amlogic/meson-ir-map.dtsi file:

--- a/arch/arm64/boot/dts/amlogic/meson-ir-map.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-ir-map.dtsi
@@ -6,11 +6,12 @@
 / {
        custom_maps: custom_maps {
-               mapnum = <4>;
+               mapnum = <5>;
                map0 = <&map_0>;
                map1 = <&map_1>;
                map2 = <&map_2>;
                map3 = <&map_3>;
+               map4 = <&map_4>;
                map_0: map_0{
                        mapname = "amlogic-remote-1";
                        customcode = <0xfb04>;
@@ -199,5 +200,27 @@
                                REMOTE_KEY(0x49, KEY_YELLOW)
                                REMOTE_KEY(0x4C, KEY_BLUE)>;
                };
+               map_4: map_4{
+                       mapname = "amlogic-remote-khadas";
+                       customcode = <0xff00>;
+                       release_delay = <80>;
+                       vendor = <0x0003>;
+                       product = <0x0003>;
+                       version = <0x0300>;
+                       size  = <13>;
+                       keymap = <REMOTE_KEY(0x14,KEY_POWER)
+                               REMOTE_KEY(0x13,KEY_MENU)
+                               REMOTE_KEY(0x03,KEY_UP)
+                               REMOTE_KEY(0x02,KEY_DOWN)
+                               REMOTE_KEY(0x0e,KEY_LEFT)
+                               REMOTE_KEY(0x1a,KEY_RIGHT)
+                               REMOTE_KEY(0x07,KEY_ENTER)
+                               REMOTE_KEY(0x58,KEY_VOLUMEDOWN)
+                               REMOTE_KEY(0x5c,KEY_F5)
+                               REMOTE_KEY(0x5b,KEY_F5)
+                               REMOTE_KEY(0x0b,KEY_VOLUMEUP)
+                               REMOTE_KEY(0x01,KEY_BACK)
+                               REMOTE_KEY(0x48,KEY_HOME)>;
+               };
        };
 };

1. The ID number of the .kl file needs to be consistent with the ID number configured within the .dtsi file.

For example, the ID numbers used in the previous step are vendor=0x0003, product=0x0003.

+                       vendor = <0x0003>;
+                       product = <0x0003>;

2. Place the Android Key Layout file into: device/khadas/common/keyboards/Vendor_xxxx_Product_xxxx.kl

For example, the ID numbers used in the previous step are vendor=0x0003, product=0x0003.

$ vim device/khadas/kVIM4/files/Vendor_0003_Product_0003.kl

key 116   POWER
key 139   MENU
key 103   DPAD_UP
key 108   DPAD_DOWN
key 105   DPAD_LEFT
key 106   DPAD_RIGHT
key 232   DPAD_CENTER
key 114   VOLUME_DOWN
key 63  　F5
key 115   VOLUME_UP
key 158   BACK
key 102   HOME

3. Verify New Configuration

kvim4:/ # dumpsys input
INPUT MANAGER (dumpsys input)
 
Input Manager State:
  Interactive: true
  System UI Visibility: 0x8708
  Pointer Speed: 0
  Pointer Gestures Enabled: true
  Show Touches: false
  Pointer Capture Enabled: false
......
    8: ir_keypad
      Classes: 0x00000029
      Path: /dev/input/event6
      Enabled: true
      Descriptor: a6893ab22828f3b8b792fe40bc0d6df2b2725f26
      Location: keypad/input0
      ControllerNumber: 0
      UniqueId:
      Identifier: bus=0x0010, vendor=0x0003, product=0x0003, version=0x0300
      KeyLayoutFile: /vendor/usr/keylayout/Vendor_0003_Product_0003.kl
      KeyCharacterMapFile: /system/usr/keychars/Generic.kcm
      ConfigurationFile:
      HaveKeyboardLayoutOverlay: false
      VideoDevice: <none>  

As shown above, when the string KeyLayoutFile: is defined as your newly created .kl file Vendor_0003_Product_0003.kl, the new configuration was saved successfully.