From inaky@linux.intel.com Tue Jul 31 20:34:55 2007 From: Inaky Perez-Gonzalez Date: Tue, 31 Jul 2007 20:34:07 -0700 Subject: [patch 11/18] usb: hook up device authorization to sysfs To: greg@kroah.com Message-ID: <20070801033439.359483485@linux.intel.com>> Makes it possible to control the authorization of USB devices through sysfs's /sys/usb/devices/*/authorize. Update: per Adrian Bunk's suggestion, make dev_attr_authorized_default static Signed-off-by: Inaky Perez-Gonzalez Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/sysfs.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -413,6 +413,44 @@ usb_descriptor_attr(bDeviceProtocol, "%0 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 usb_dev_authorized_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct usb_device *usb_dev = to_usb_device(dev); + return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized); +} + + +/* + * Authorize a device to be used in the system + * + * Writing a 0 deauthorizes the device, writing a 1 authorizes it. + */ +static ssize_t usb_dev_authorized_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + ssize_t result; + struct usb_device *usb_dev = to_usb_device(dev); + unsigned val; + result = sscanf(buf, "%u\n", &val); + if (result != 1) + result = -EINVAL; + else if (val == 0) + result = usb_deauthorize_device(usb_dev); + else + result = usb_authorize_device(usb_dev); + return result < 0? result : size; +} + +static DEVICE_ATTR(authorized, 0644, + usb_dev_authorized_show, usb_dev_authorized_store); + + static struct attribute *dev_attrs[] = { /* current configuration's attributes */ &dev_attr_configuration.attr, @@ -435,6 +473,7 @@ static struct attribute *dev_attrs[] = { &dev_attr_version.attr, &dev_attr_maxchild.attr, &dev_attr_quirks.attr, + &dev_attr_authorized.attr, NULL, }; static struct attribute_group dev_attr_grp = {