linxu 驱动 DEVICE_ATTR和device_create_file 学习实例
简述：linux 驱动中到处可见DEVICE_ATTR和device_create_file，相关的概念我这里就不说了，网上很多。下面就是我自己学习和测试的实例。
在Android上测试，测试driver代码：
#include <linux/init.h>
#include <linux/module.h>/*驱动注册的头文件，包含驱动的结构体和注册和卸载的函数*/
#include <linux/platform_device.h>#define DRIVER_NAME "love_tanghanyue"MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("TOPEET");static ssize_t lovelinux_show(struct device *dev, struct device_attribute *attr, char *buf)
{printk("lovelinux_show i love tanghanyue!\n");
}static ssize_t lovelinux_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{printk("lovelinux_store\n");
}
static DEVICE_ATTR(vib, 0664, lovelinux_show, lovelinux_store);static int hello_probe(struct platform_device *pdv){int err;printk(KERN_EMERG "\tinitialized\n");err = device_create_file(&pdv->dev, &dev_attr_vib);if (err)printk(KERN_EMERG "\tdevice_create_file_error\n");elseprintk(KERN_EMERG "\t very good device_create_file_success\n");return 0;
}static int hello_remove(struct platform_device *pdv){return 0;
}static void hello_shutdown(struct platform_device *pdv){;
}static int hello_suspend(struct platform_device *pdv){return 0;
}static int hello_resume(struct platform_device *pdv){return 0;
}struct platform_driver hello_driver = {.probe = hello_probe,.remove = hello_remove,.shutdown = hello_shutdown,.suspend = hello_suspend,.resume = hello_resume,.driver = {.name = DRIVER_NAME,.owner = THIS_MODULE,}
};static int hello_init(void)
{int DriverState;printk(KERN_EMERG "HELLO WORLD enter! hanyue\n");DriverState = platform_driver_register(&hello_driver);printk(KERN_EMERG "\tDriverState is %d\n",DriverState);return 0;
}static void hello_exit(void)
{printk(KERN_EMERG "HELLO WORLD exit!\n");platform_driver_unregister(&hello_driver);
}module_init(hello_init);
module_exit(hello_exit);
运行结果：
