x4412 基於裝置樹的 hello_world驅動
阿新 • • 發佈:2018-12-18
首先在exynos4412-x4412.dts檔案中新增HelloWorld節點,如下:
HelloWorld {
compatible = "x4412, hello_world";
status = "okay";
};
然後新建一個 hello_world.c 原始檔,具體原始碼如下:
/* * Hello World Driver for X4412 * * Copyright (c) 2018 * Author: YYH * This is a simple module driver example for x4412 base on dts * */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/gpio.h> #include <linux/of.h> static int hello_world_probe(struct platform_device *pdev) { pr_notice("Driver probe : %s\n", __func__); return 0; } static int hello_world_remove(struct platform_device *pdev) { pr_notice("Driver remove : %s\n", __func__); return 0; } static void hello_world_shutdown(struct platform_device *pdev) { pr_notice("Driver shutdown : %s\n", __func__); return ; } static int hello_world_suspend(struct platform_device *pdev, pm_message_t state) { pr_notice("Driver suspend : %s\n", __func__); return 0; } static int hello_world_resume(struct platform_device *pdev) { pr_notice("Driver resume : %s\n", __func__); return 0; } static const struct of_device_id tiny4412_hello_world_dt_match[] = { { .compatible = "x4412,hello_world" }, {}, }; static struct platform_driver x4412_hello_world_driver = { .probe = hello_world_probe, .remove = hello_world_remove, .shutdown = hello_world_shutdown, .suspend = hello_world_suspend, .resume = hello_world_resume, .driver = { .name = "hello world", .of_match_table = tiny4412_hello_world_dt_match, }, }; module_platform_driver(x4412_hello_world_driver); MODULE_AUTHOR("YYH"); MODULE_LICENSE("GPL v2");
最後新建一個Makefile檔案用來編譯生成hello_world.ko檔案。具體內容如下
obj-m := hello_world.o PWD := $(shell pwd) KDIR := /home/yyh/Desktop/farsight/linux-4.9.123 all: make -C $(KDIR) M=$(PWD) modules ARCH=arm CROSS_COMPILE=/home/yyh/Desktop/farsight/gcc4.6/gcc-4.6.4/bin/arm-none-linux-gnueabi- clean: rm -rf .*.cmd *.o *.mod.c *.ko .tmp_versions