學習《Linux裝置模型淺析之驅動篇》筆記(一)
原文中說了,核心版本為2.6.29;這裡都貼3.15的核心原始碼;
檔案/drivers/rtc/rtc-s3c.c
static struct platform_driver s3c_rtc_driver
= {
.probe= s3c_rtc_probe,
.remove= s3c_rtc_remove,
.id_table= s3c_rtc_driver_ids,
.driver= {
.name= "s3c-rtc",
.owner= THIS_MODULE,
.pm= &s3c_rtc_pm_ops,
.of_match_table= of_match_ptr(s3c_rtc_dt_match),
},
};
檔案/include/linux/platform_device.h
/*
* use a macro to avoid include chaining to get THIS_MODULE
*/
#define platform_driver_register(drv) \
__platform_driver_register(drv, THIS_MODULE)
檔案/drivers/base/platforms.c
/**
* __platform_driver_register - 為平臺級別設備註冊一個驅動
* @drv: platform驅動結構
* @owner: module/driver所有者
*/
int __platform_driver_register
struct module *owner)
{
drv->driver.owner = owner;
drv->driver.bus = &platform_bus_type;
if (drv->probe)
drv->driver.probe = platform_drv_probe;
if (drv->remove)
drv->driver.remove = platform_drv_remove;
if (drv->shutdown)
drv->driver.shutdown = platform_drv_shutdown;
return driver_register
}
/**
* driver_register - 為bus註冊驅動
* @drv: 要註冊的驅動
*
* 我們把大部分工作交給了bus_add_driver() 呼叫,因為我們
* 要處理的大部分事情是bus結構.
*/
int driver_register(struct device_driver *drv)
{
int ret;
struct device_driver *other;
BUG_ON(!drv->bus->p);
if ((drv->bus->probe && drv->probe) ||
(drv->bus->remove && drv->remove) ||
(drv->bus->shutdown && drv->shutdown))
printk(KERN_WARNING "Driver '%s' needs updating - please use "
"bus_type methods\n", drv->name);
other = driver_find(drv->name, drv->bus);
if (other) {
printk(KERN_ERR "Error: Driver '%s' is already registered, "
"aborting...\n", drv->name);
return -EBUSY;
}
ret = bus_add_driver(drv);
if (ret)
return ret;
ret = driver_add_groups(drv, drv->groups);
if (ret) {
bus_remove_driver(drv);
return ret;
}
kobject_uevent(&drv->p->kobj, KOBJ_ADD);
return ret;
}
/**
* driver_find - locate driver on a bus by its name.
* @name: name of the driver.
* @bus: bus to scan for the driver.
*
* Call kset_find_obj() to iterate over list of drivers on
* a bus to find driver by name. Return driver if found.
*
* This routine provides no locking to prevent the driver it returns
* from being unregistered or unloaded while the caller is using it.
* The caller is responsible for preventing this.
*/
struct device_driver *driver_find(const char *name, struct bus_type *bus)
{
struct kobject *k = kset_find_obj(bus->p->drivers_kset, name);
struct driver_private *priv;
if (k) {
/* Drop reference added by kset_find_obj() */
kobject_put(k);
priv = to_driver(k);
return priv->driver;
}
return NULL;
}