Linux USB subsystem --- register generic usb driver

Linux USB subsystem --- register generic usb driver

[Linux 3.2] [driver/usb/core/driver.c]

函数：usb_register_device_driver

[cpp]
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/**
* usb_register_device_driver - register a USB device (not interface) driver
* @new_udriver: USB operations for the device driver
* @owner: module owner of this driver.
*
* Registers a USB device driver with the USB core. The list of
* unattached devices will be rescanned whenever a new driver is
* added, allowing the new driver to attach to any recognized devices.
* Returns a negative error code on failure and 0 on success.
*/
int usb_register_device_driver(struct usb_device_driver *new_udriver,
struct module *owner)
{
int retval = 0;

if (usb_disabled())
return -ENODEV;

new_udriver->drvwrap.for_devices = 1;
new_udriver->drvwrap.driver.name = (char *) new_udriver->name;
new_udriver->drvwrap.driver.bus = &usb_bus_type;
new_udriver->drvwrap.driver.probe = usb_probe_device;
new_udriver->drvwrap.driver.remove = usb_unbind_device;
new_udriver->drvwrap.driver.owner = owner;

retval = driver_register(&new_udriver->drvwrap.driver);

if (!retval) {
pr_info("%s: registered new device driver %s\n",
usbcore_name, new_udriver->name);
usbfs_update_special();
} else {
printk(KERN_ERR "%s: error %d registering device "
" driver %s\n",
usbcore_name, retval, new_udriver->name);
}

return retval;
}
EXPORT_SYMBOL_GPL(usb_register_device_driver);

此过程是注册一个usb的通用程驱动。驱动注册的过程与usbfs驱动注册类似。其结果是：在/sys/bus/usb/drivers/下面创建usb目录。在usb目录下面创建如下属性文件。
bind uevent unbind

至此，整个usb core的初始化过程完成。

后面将进入到USB host controller的初始化。