There is an attribute for each interface to allow (1) or deny (0) it:
/sys/bus/usb/devices/*-*:*.*/authorized
Signed-off-by: Stefan Koch <skoch@xxxxxxx>
---
drivers/usb/core/sysfs.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 44 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index d269738..8e25292 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -622,7 +622,6 @@ usb_descriptor_attr(bDeviceProtocol, "%02x\n");
usb_descriptor_attr(bNumConfigurations, "%d\n");
usb_descriptor_attr(bMaxPacketSize0, "%d\n");
-
/* show if the device is authorized (1) or not (0) */
static ssize_t authorized_show(struct device *dev,
struct device_attribute *attr, char *buf)
@@ -926,6 +925,49 @@ static ssize_t supports_autosuspend_show(struct device *dev,
}
static DEVICE_ATTR_RO(supports_autosuspend);
+/*
+ * interface_authorized_show - show authorization status of an USB interface
+ * 1 is authorized, 0 is deauthorized
+ */
+static ssize_t interface_authorized_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+
+ if (!intf)
+ return -ENODEV;
+
+ return sprintf(buf, "%u\n", intf->authorized);
+}
+
+/*
+ * interface_authorized_store - authorize or deauthorize an USB interface
+ * 1 is to authorize, 0 is to deauthorize
+ */
+static ssize_t interface_authorized_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ unsigned val;
+
+ if (sscanf(buf, "%u\n", &val) != 1)
+ return -EINVAL;
+
+ switch (val) {
+ case 0:
+ usb_deauthorize_interface(intf);
+ break;
+ case 1:
+ usb_authorize_interface(intf);
+ break;
+ }
+
+ return count;
+}
+static struct device_attribute dev_attr_interface_authorized =
+ __ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR,
+ interface_authorized_show, interface_authorized_store);
+
static struct attribute *intf_attrs[] = {
&dev_attr_bInterfaceNumber.attr,
&dev_attr_bAlternateSetting.attr,
@@ -935,6 +977,7 @@ static struct attribute *intf_attrs[] = {
&dev_attr_bInterfaceProtocol.attr,
&dev_attr_modalias.attr,
&dev_attr_supports_autosuspend.attr,
+ &dev_attr_interface_authorized.attr,
NULL,
};
static struct attribute_group intf_attr_grp = {
--
2.1.4
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