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Commit b3910cef authored by Stefan Koch's avatar Stefan Koch Committed by Greg Kroah-Hartman
Browse files

usb: interface authorization: Introduces the USB interface authorization 



The kernel supports the device authorization because of wireless USB.
These is usable for wired USB devices, too.
These new interface authorization allows to enable or disable
individual interfaces instead a whole device.

If a deauthorized interface will be authorized so the driver probing must
be triggered manually by writing INTERFACE to /sys/bus/usb/drivers_probe

Signed-off-by: default avatarStefan Koch <stefan.koch10@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8d1f8573

drivers/usb/core/message.c

+38 −0
Original line number Diff line number Diff line
@@ -1555,6 +1555,44 @@ static void usb_release_interface(struct device *dev) 
	kfree(intf);

}



/*

 * usb_deauthorize_interface - deauthorize an USB interface

 *

 * @intf: USB interface structure

 */

void usb_deauthorize_interface(struct usb_interface *intf)

{

	struct device *dev = &intf->dev;



	device_lock(dev->parent);



	if (intf->authorized) {

		device_lock(dev);

		intf->authorized = 0;

		device_unlock(dev);



		usb_forced_unbind_intf(intf);

	}



	device_unlock(dev->parent);

}



/*

 * usb_authorize_interface - authorize an USB interface

 *

 * @intf: USB interface structure

 */

void usb_authorize_interface(struct usb_interface *intf)

{

	struct device *dev = &intf->dev;



	if (!intf->authorized) {

		device_lock(dev);

		intf->authorized = 1; /* authorize interface */

		device_unlock(dev);

	}

}



static int usb_if_uevent(struct device *dev, struct kobj_uevent_env *env)

{

	struct usb_device *usb_dev;

drivers/usb/core/usb.h

+2 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ extern void usb_release_interface_cache(struct kref *ref); 
extern void usb_disable_device(struct usb_device *dev, int skip_ep0);

extern int usb_deauthorize_device(struct usb_device *);

extern int usb_authorize_device(struct usb_device *);

extern void usb_deauthorize_interface(struct usb_interface *);

extern void usb_authorize_interface(struct usb_interface *);

extern void usb_detect_quirks(struct usb_device *udev);

extern void usb_detect_interface_quirks(struct usb_device *udev);

extern int usb_remove_device(struct usb_device *udev);