Hello.
On 07/28/2015 04:38 PM, Stefan Koch wrote:
This introduces an attribute for each interface to
authorize (1) or deauthorize (0) it:
/sys/bus/usb/devices/INTERFACE/authorized
Signed-off-by: Stefan Koch <skoch@xxxxxxx>
---
drivers/usb/core/sysfs.c | 43 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 41 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index d269738..b11105e 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
[...]
@@ -926,6 +924,46 @@ 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);
+
+ 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);
+ bool val;
+
+ if (strtobool(buf, &val) != 0)
+ return -EINVAL;
+
+ switch (val) {
+ case false:
+ usb_deauthorize_interface(intf);
+ break;
+ case true:
+ usb_authorize_interface(intf);
+ break;
I'd write the above as a single *if* statement, using *switch* doesn't
seem justified.
[...]
MBR, Sergei
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