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: Stefan Koch <skoch@xxxxxxx>
---
drivers/usb/core/message.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/usb/core/usb.h | 2 ++
2 files changed, 54 insertions(+)
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 1e85f62..333957a 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1555,6 +1555,58 @@ static void usb_release_interface(struct device *dev)
kfree(intf);
}
+/*
+ * usb_deauthorize_interface - deauthorize an USB interface
+ *
+ * @intf: USB interface structure
+ *
+ * Returns: 0 at success, <0 at failure
+ */
+int usb_deauthorize_interface(struct usb_interface *intf)
+{
+ struct device *dev = &intf->dev;
+
+ if (!dev || !dev->parent)
+ return -ENODEV;
+
+ 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);
+
+ return 0;
+}
+
+/*
+ * usb_authorize_interface - authorize an USB interface
+ *
+ * @intf: USB interface structure
+ *
+ * Returns: 0 at success, <0 at failure
+ */
+int usb_authorize_interface(struct usb_interface *intf)
+{
+ struct device *dev = &intf->dev;
+
+ if (!dev)
+ return -ENODEV;
+
+ if (!intf->authorized) {
+ device_lock(dev);
+ intf->authorized = 1; /* authorize interface */
+ device_unlock(dev);
+ }
+
+ return 0;
+}
+
static int usb_if_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct usb_device *usb_dev;
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 7eb1e26..37b0055 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -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 int usb_deauthorize_interface(struct usb_interface *);
+extern int 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);
--
2.1.4
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
