也就是module方式注册设备，module方式注册驱动。注意：函数和变量都用static修饰，只在当前文件中生效，避免重名带来的影响。
module注册设备
编写platform_device_hello.c，对应的Makefile只需改下编译输出命名。
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#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("jerry");
#define DEV_NAME "platform_hello"
static void hello_release(struct device *pdv){
printk(KERN_EMERG "hello_release ok!\n");
};
static struct platform_device platform_dev_hello = {
.name = DEV_NAME,
.id = -1,
.dev = {
.release = hello_release,
},
};
static int hello_init(void){
platform_device_register(&platform_dev_hello);
return 0;
}
static void hello_exit(void){
platform_device_unregister(&platform_dev_hello);
}
module_init(hello_init);
module_exit(hello_exit);
module注册驱动
编写platform_driver_hello.c，对应的Makefile只需改下编译输出命名。
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#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("jerry");
#define DRV_NAME "platform_hello"
static int hello_probe(struct platform_device *pdv){
printk(KERN_EMERG "hello_probe ok!\n");
printk(KERN_EMERG "pdv->name is %s\n",pdv->name);
printk(KERN_EMERG "pdv->id is %d\n",pdv->id);
pdv->dev.release(&pdv->dev); // only for test
return 0;
}
static int hello_remove(struct platform_device *pdv){
printk(KERN_EMERG "hello_remove ok!\n");
return 0;
}
static void hello_shutdown(struct platform_device *pdv){
printk(KERN_EMERG "hello_shutdown ok!\n");
}
static int hello_suspend(struct platform_device *pdv, pm_message_t state){
printk(KERN_EMERG "hello_suspend ok!\n");
return 0;
}
static int hello_resume(struct platform_device *pdv){
printk(KERN_EMERG "hello_resume ok!\n");
return 0;
}
static struct platform_driver platform_drv_hello = {
.probe = hello_probe,
.remove = hello_remove,
.shutdown = hello_shutdown,
.suspend = hello_suspend,
.resume = hello_resume,
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
static int hello_init(void){
platform_driver_register(&platform_drv_hello);
return 0;
}
static void hello_exit(void){
platform_driver_unregister(&platform_drv_hello);
}
module_init(hello_init);
module_exit(hello_exit);
先加载设备模块，再加载驱动模块可以正常匹配。结果和预期一致。
事实上，先加载驱动再加载设备模块也会调用一次驱动probe函数。
