单触摸屏驱动配置

本章节驱动配置过程中，以GT9XX为操作示例。

驱动移植

将厂商提供的驱动移植进SDK目录，并修改添加进编译文件，驱动文件拷贝到触摸驱动的文件夹下$(SDK_DIR)\kernel-5.10\drivers\input\touchscreen。

修改kconfig：

config TOUCHSCREEN_GT9XX
    tristate "GT9XX touchscreens support"

修改Makefile：

obj-$(CONFIG_TOUCHSCREEN_GT9XX)     += gt9xx/

内核配置添加CONFIG_TOUCHSCREEN_GT9XX=y,内核配置文件如arch/arm64/configs/rockchip_defconfig，不同版本的defconfig请自行在git历史记录中查找对应的版本文件。

内核设备树配置

i2c_gt9xx配置：

&i2c1 {
    status = "okay";
    gt9xx:gt9xx@5d {
        compatible = "goodix,gt9xx";
        status = "okay";
        reg = <0x5d>;

        gtp_resolution_x = <1024>;
        gtp_resolution_y = <600>;
        gtp_int_tarigger = <1>;
        gtp_change_x2y = <0>;
        gtp_overturn_x = <0>;
        gtp_overturn_y = <0>;
        gtp_send_cfg = <1>;
        gtp_touch_wakeup = <1>;
        goodix_rst_gpio = <&gpio0 RK_PB6 GPIO_ACTIVE_HIGH>;
        goodix_irq_gpio = <&gpio3 RK_PA3 IRQ_TYPE_LEVEL_LOW>;
        pinctrl-names = "default";
        pinctrl-0 = <&touch3_gpio>;

        goodix,cfg-group0 = [
            4B 00 04 58 02 01 0D 00 01 08
            28 05 50 32 03 05 00 00 00 00
            00 00 00 00 00 00 00 8B 2A 0C
            17 15 31 0D 00 00 02 BA 03 2D
            00 00 00 00 00 03 00 00 00 00
            00 0F 41 94 C5 02 07 00 00 04
            9B 11 00 77 17 00 5C 1F 00 48
            2A 00 3B 38 00 3B 00 00 00 00
            00 00 00 00 00 00 00 00 00 00
            00 00 00 00 00 00 00 00 00 00
            00 00 00 00 00 00 00 00 00 00
            00 00 02 04 06 08 0A 0C 0E 10
            12 14 16 18 FF FF 00 00 00 00
            00 00 00 00 00 00 00 00 00 00
            00 00 00 02 04 06 08 0A 0C 0F
            10 12 13 16 18 1C 1D 1E 1F 20
            21 22 24 FF FF FF FF FF 00 00
            00 00 00 00 00 00 00 00 00 00
            00 00 00 00 B6 01
        ];
    };
};

旋转触摸方向

基于设备树调整触摸屏方向，以下方向仅适用于GT9XX驱动：

0度（默认）

gt9xx:gt9xx@5d {
    gtp_change_x2y = <0>;       
    gtp_overturn_x = <0>;
    gtp_overturn_y = <0>;
};

90度

gt9xx:gt9xx@5d {
    gtp_change_x2y = <1>;
    gtp_overturn_x = <1>;
    gtp_overturn_y = <0>;
};

180度

gt9xx:gt9xx@5d {
    gtp_change_x2y = <0>;
    gtp_overturn_x = <0>;
    gtp_overturn_y = <1>;
};

270度

gt9xx:gt9xx@5d {
    gtp_change_x2y = <0>;
    gtp_overturn_x = <1>;
    gtp_overturn_y = <0>;
};