platform平台设备驱动简化示例代码
driver.c:
#include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/device.h> #include <linux/platform_device.h> #define DRIVER_NAME "my_dev" static int my_probe(struct device *dev) { printk("driver found device !!\n"); return 0; } static int my_remove(struct device *dev) { printk("driver found device unpluged !!\n"); return 0; } struct platform_driver my_driver={ .probe=my_probe, .remove=my_remove, .driver={ //platform_driver内嵌device_driver .owner=THIS_MODULE, .name =DRIVER_NAME,//最重要的是对name的赋值,因为在匹配的时候要用!!!! }, }; static int __init my_driver_init(void) { int ret =0; /*注册平台驱动*/ ret=platform_driver_register(&my_driver); return ret; } static void __exit my_driver_exit(void) { /*注销平台驱动*/ platform_driver_unregister(&my_driver); } MODULE_AUTHOR("mhb@SEU"); MODULE_LICENSE("GPL"); module_init(my_driver_init); module_exit(my_driver_exit);
device.c:
#include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/platform_device.h> #include <linux/device.h> #define DEVICE_NAME "my_dev" struct platform_device *my_device; static int __init my_device_init(void) { int ret=0; /*分配结构体内存*/ my_device=platform_device_alloc(DEVICE_NAME,-1); /*注册平台设备*/ ret=platform_device_add(my_device);//在platform_device_alloc中已经init了,所以调用add而不是register if(ret) platform_device_put(my_device);/*注册失败,释放相关内存*/ return ret; } static void __exit my_device_exit(void) { platform_device_unregister(my_device); } MODULE_AUTHOR("mhb@SEU"); MODULE_LICENSE("GPL"); module_init(my_device_init); module_exit(my_device_exit);