How to use GPIO key in ODROID-C2(android).

How to use GPIO key in ODROID-C2(android).

Builtin GPIO polled driver.

CONFIG_KEYBOARD_GPIO_POLLED

linux keycode table

http://www.comptechdoc.org/os/linux/howlinuxworks/linux_hlkeycodes.html

F7	65	41 c1	65	[18~ 1b 5b 31 38 7e	[31~ 1b 5b 33 31 7e		[18~ 1b 5b 31 38 7e
F8	66	42 c2	66	[19~ 1b 5b 31 39 7e	[32~ 1b 5b 33 32 7e		[19~ 1b 5b 31 39 7e
F9	67	43 c3	67	[20~ 1b 5b 32 30 7e	[33~ 1b 5b 33 33 7e		[20~ 1b 5b 32 30 7e
F10	68	44 c4	68	[21~ 1b 5b 32 31 7e	[34~ 1b 5b 33 34 7e		[21~ 1b 5b 32 32 7e

Expansion Connectors

http://odroid.com/dokuwiki/doku.php?id=en:c2_hardware#expansion_connectors



edit arch/arm64/boot/dts/meson64_odroidc2.dts
gpio_keys_polled {
compatible =
"gpio-keys-polled";
#address-cells = <1>;
#size-cells = <0>;
poll-interval = <100>;
autorepeat;
button@1 {
label = "GPIO Key F7";
linux,code = <65>;
gpios = <&gpio GPIOX_19 1>;
};
button@2 {
label = "GPIO Key F8";
linux,code = <66>;
gpios = <&gpio GPIOX_11 1>;
};
button@3 {
label = "GPIO Key F9";
linux,code = <67>;
gpios = <&gpio GPIOX_9 1>;
};
button@4 {
label = "GPIO Key F10";
linux,code = <68>;
gpios = <&gpio GPIOX_7 1>;
};
};



You can receive key event(scancode) without keycode.

Add keycode in system/usr/keylayout/Vendor_0001_Product_0001.kl.

key 75F3
key 76F4
key 77F5
key 64F6
key 65F7
key 66F8
key 67F9
key 68F10
key 69F11