字符设备驱动之笔记-Platform设备驱动机制（2）

 

/* 1.构建平台驱动的结构体*/
static struct platform_driver s3c2410fb_driver = {
 .probe  = s3c2410fb_probe,
 .driver  = {
  .name = "s3c2410-lcd",
  .owner = THIS_MODULE,
 },
};

/*2. 注册这个平台驱动结构体*/
int __devinit s3c2410fb_init(void)
{
 return platform_driver_register(&s3c2410fb_driver);
}

platform_driver_register里面做了什么事情
----------------------------------------------------------------------------
 drv->driver.bus = &platform_bus_type;   /*将我们的驱动bus设置为虚拟的平台总线类型*/
 return driver_register(&drv->driver);         /*向虚拟平台总线的驱动链表上注册*/
  return bus_add_driver(drv);    /*将本drv驱动注册登记到drv->bus所在的总线上*/
  /*里面实现了什么*/  
   if (drv->bus->drivers_autoprobe) {
    error = driver_attach(drv);      /*调用此函数去总线的设备链表上匹配*/
     return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach);    /*搜寻设备链表上的每个设备并调用            总线的match函数*/
       klist_iter_init_node(&bus->klist_devices, &i,
             (start ? &start->knode_bus : NULL));
       while ((dev = next_device(&i)) && !error)
       error = fn(dev, data);    //__driver_attach
       klist_iter_exit(&i);

__driver_attach的分析：
---------------------------------------------------------
if (!dev->driver)
 driver_probe_device(drv, dev);
  if (drv->bus->match && !drv->bus->match(dev, drv))    //drv->bus->platform_match
  goto done;
  ret = really_probe(dev, drv);
   {
    else if (drv->probe) {
     ret = drv->probe(dev);     //s3c2410fb_probe,
    }
   }

platform_bus_type 结构体的定义：
--------------------------------------------------------
struct bus_type platform_bus_type = {
 .name  = "platform",
 .dev_attrs = platform_dev_attrs,
 .match  = platform_match,
 .uevent  = platform_uevent,
 .suspend = platform_suspend,
 .suspend_late = platform_suspend_late,
 .resume_early = platform_resume_early,
 .resume  = platform_resume,
};
里面有个非常关键的函数platform_match

platform_match里面做了什么事情：（匹配驱动和设备）
---------------------------------------------------------------------------
static int platform_match(struct device * dev, struct device_driver * drv)
{
 struct platform_device *pdev = container_of(dev, struct platform_device, dev);
 /*靠名字来匹配，名字哪里来的   .name = "s3c2410-lcd"*/
 return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0);
}