From 187b3d75bbfba45a38b5d1d3656c0f11f6f6f2d0 Mon Sep 17 00:00:00 2001 From: Stefan Koch Date: Sat, 8 Aug 2015 11:32:54 +0200 Subject: usb: interface authorization: SysFS part of USB interface authorization 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 Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/sysfs.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index cfc68c11c3f5..d9ec2de6c4cf 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -957,6 +957,41 @@ 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 + */ +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; + + if (val) + usb_authorize_interface(intf); + else + usb_deauthorize_interface(intf); + + return count; +} +static struct device_attribute dev_attr_interface_authorized = + __ATTR(authorized, S_IRUGO | S_IWUSR, + interface_authorized_show, interface_authorized_store); + static struct attribute *intf_attrs[] = { &dev_attr_bInterfaceNumber.attr, &dev_attr_bAlternateSetting.attr, @@ -966,6 +1001,7 @@ 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 = { -- cgit v1.2.3