Linux设备驱动模型，主要函数分析

整个驱动模型中，最核心的三个函数分别是

__bus_register、driver_register、device_register

int __bus_register(struct bus_type *bus, struct lock_class_key *key)

retval = kobject_set_name(&priv->subsys.kobj, "%s", bus->name);//设置总线的名字

retval = kset_register(&priv->subsys);//注册总线容器

priv->devices_kset = kset_create_and_add("devices", NULL,&priv->subsys.kobj);//创建一个在总线目录下的devices目录

priv->drivers_kset = kset_create_and_add("drivers", NULL,&priv->subsys.kobj);//创建一个在总线目录下的drivers目录

klist_init(&priv->klist_devices, klist_devices_get, klist_devices_put);//初始化设备链表

klist_init(&priv->klist_drivers, NULL, NULL);//初始化驱动程序链表

int driver_register(struct device_driver *drv)//注册driver到总线bus上

other = driver_find(drv->name, drv->bus);//查找是否已注册进总线

ret = bus_add_driver(drv);//此时总线上没注册该driver，开始注册driver

klist_init(&priv->klist_devices, NULL, NULL);//初始化设备链表

error = kobject_init_and_add(&priv->kobj, &driver_ktype, NULL,"%s", drv->name);//在driver目录中建立一个drv->name目录

error = driver_attach(drv);//进行driver和device的连接

bus_for_each_dev(drv->bus, NULL, drv, __driver_attach);//遍历每个device并且调用__driver_attach

__driver_attach

driver_match_device(drv, dev)//匹配driver和device的名字

driver_probe_device(drv, dev);//匹配成功则调用探测函数probe

klist_add_tail(&priv->knode_bus, &bus->p->klist_drivers);//将driver放进总线klist_drivers中

int device_register(struct device *dev)//注册device到总线上

device_initialize(dev);//初始化设备

device_add(dev);//添加device到bus中

bus_probe_device(dev);//进行driver和device的连接

device_attach(dev);

bus_for_each_drv(dev->bus, NULL, dev, __device_attach);//遍历每个driver并且调用__device_attach

__device_attach

driver_match_device(drv, dev)//匹配driver和device的名字

driver_probe_device(drv, dev);//匹配成功则调用探测函数probe

klist_add_tail(&dev->p->knode_parent,&parent->p->klist_children);

klist_add_tail(&dev->knode_class,&dev->class->p->klist_devices);//将device添加进总线klist_devices中