MTK点亮TP（touchpanel） |
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MTK点亮TP（touchpanel）
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与之前不同的是，tp涉及到i2c或在spi了，大部分还是通过i2c地址来判别的，本例子也通过i2c来举例 1.配置对应的dtsi $(LINUX_KERNEL_VERSION)/arch/arm/boot/dts/$(MTK_PLATFORM).dts （分别对应内核版本，32还是64位，mtk平台） 在主dts中配置touch的设备节点，会与驱动里面对应 touch: touch { compatible = "mediatek,touch"; }; 在项目所在的dst里面配置设备相关信息，不过因为tp的设备类型可能有变化，所以一般单独定义 $(LINUX_KERNEL_VERSION)/arch/arm/boot/dts/$(yourprojectname).dts里面导入我们定义出来的定义文件 #include "cust_mt6761_touch_1600x720.dtsi"（本项目是mt6761平台，1600x720分辨率）根据自己情况定义，与定义文件名保持一致即可 /* TOUCH start */ &i2c0 { clock-frequency = ; pinctrl-names = "default", "ts_int_active", "ts_reset_active", "ts_int_suspend", "ts_reset_suspend", "ts_i2c_mode", "ts_eint_high"; pinctrl-0 = ; pinctrl-1 = ; pinctrl-2 = ; pinctrl-3 = ; pinctrl-4 = ; pinctrl-5 = ; pinctrl-6 = ; }; &touch { tpd-resolution = ; lcm-resolution = ; tpd-cfg-version = "config17"; tpd-max-touch-num = ; use-tpd-button = ; tpd-key-num = ; tpd-key-local= ; tpd-key-dim-local = ; interrupt-parent = ; interrupts = ; goodix,eint-gpio = ; goodix,reset-gpio = ; vtouch-supply = ; /*jadard dt info*/ jadard,panel-sense-nums = ; jadard,panel-coords = ; jadard,panel-max-points = ; jadard,int-is-edge = ; gpios=,; jadard,irq-gpio = ; jadard,rst-gpio = ; /* Rotate cord when open blew lables */ /*goodix,x2x;*/ /*goodix,y2y;*/ tpd-filter-enable = ; tpd-filter-pixel-density = ; tpd-filter-custom-prameters = ; tpd-filter-custom-speed = ; status = "okay"; }; &pio { ctp_pins_default: eintdefault { }; ctp_ts_int_active: int_active { pins_cmd_dat { pinmux = ; input-enable; bias-pill-up = ; }; }; ctp_ts_reset_active: reset_active { pins_cmd_dat { pinmux = ; slew-rate = ; output-high; }; }; ctp_ts_int_suspend: int_suspend { pins_cmd_dat { pinmux = ; slew-rate = ; output-low; }; }; ctp_ts_reset_suspend: reset_suspend { pins_cmd_dat { pinmux = ; slew-rate = ; output-low; }; }; ctp_ts_i2c_mode: i2cmode_default { pins_cmd_dat { pinmux = , ; }; }; ctp_ts_int_as_gpio: int_high { pins_cmd_dat { pinmux = ; slew-rate = ; output-high; }; }; }; /* TOUCH end */注意与自己项目原理图对应，改i2c通道，scl与sda，tp的eint引脚与reset引脚实际的gpio 2.修改dws，dws现在一般只有三条路径，都要保持一致 根据原理图，在scl，sda，tp_eint，tp_rst对应的gpio处修改 $(LINUX_KERNEL_VERSION)/drivers/misc/mediatek/dws/$(MTK_PLATFORM)/$(yourprojectname).dws vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/$(yourprojectname)/dct/dct/codegen.dws vendor/mediatek/proprietary/custom/$(yourprojectname)/kernel/dct/dct/codegen.dws 改dws，我推荐mtk自带的工具vendor/mediatek/proprietary/tools/dct/DrvGen.exe,不过需要在windows环境打开，修改goip与i2c与enit很方便
3.在user与userdebug的config文件创建驱动宏 $(LINUX_KERNEL_VERSION)/arch/arm/configs/$(yourprojectname)_debug_defconfig $(LINUX_KERNEL_VERSION)/arch/arm/configs/$(yourprojectname)_defconfig CONFIG_INPUT_TOUCHSCREEN=y CONFIG_TOUCHSCREEN_MTK_JDCHIPSET_XBD=y // y代表true is not set 为false 4.在驱动外的makefile与Kconfig添加驱动的加载路径 kernel-4.19/drivers/input/touchscreen/Makefile obj-$(CONFIG_TOUCHSCREEN_MTK_JDCHIPSET_XBD) += jadard_xbd/ //后面这个是驱动名 这个宏与上面config文件里面宏匹配上了，如果为true，编译后面驱动，false不编译 kernel-4.19/drivers/input/touchscreen/Kconfig config CONFIG_TOUCHSCREEN_MTK_JDCHIPSET_XBD bool "MediaTek Touch Panel Driver" help Say Y here if you have MediaTek touch panel. If unsure, say N. To compile this dirver as a module, choose M here: the module will be called. 或者简写为 config TOUCHSCREEN_MTK_JDCHIPSET_XBD bool "jadard directory name" default n 5.添加厂家给的驱动 $(LINUX_KERNEL_VERSION)/drivers/input/touchscreen/jadard_xbd（根据自己的驱动名） |
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