這裏以Amlogic A113爲例
按鍵DTS配置
arch/arm64/boot/dts/amlogic/xxx.dts gpio key dts 配置 :
gpio_keypad{
compatible = "amlogic, gpio_keypad";
status = "disable";
scan_period = <20>;
key_num = <2>;
key_name = "mute","Alexa_wakeup";
key_code = <115 116>;
key_pin = <&gpio GPIOZ_10 GPIO_ACTIVE_LOW>,
<&gpio_ao GPIOAO_4 GPIO_ACTIVE_LOW>;
interrupts = <0 70 1
0 71 2>;
interrupt-names = "irq_keyup", "irq_keydown";
};
// key_name:按鍵名稱
// key_num:按鍵數量
// key_code:按鍵上報值
// key_pin:gpio配置
驅動源文件路徑
//配置 arch/arm64/configs/meson64_smarthome_defconfig->CONFIG_AMLOGIC_GPIO_KEY=y //gpio key驅動文件路徑 drivers/amlogic/input/keyboard/adc_keypad.c //按鍵定義 include/dt-bindings/input/linux-event-codes.h
開發板測試
驅動正常加載之後,進入文件系統,查看信息
# cat /proc/bus/input/devices I: Bus=0010 Vendor=0001 Product=0001 Version=0100 N: Name="gpio_keypad" P: Phys=gpio_keypad/input0 S: Sysfs=/devices/platform/gpio_keypad/input/input0 U: Uniq= H: Handlers=kbd event0 B: PROP=0 B: EV=100003 B: KEY=1f80000 0 0 0
測試按鍵是否按下擡起1
//按下按鍵,會上報鍵值 cat /dev/input/event0