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authorInaky Perez-Gonzalez <inaky@linux.intel.com>2007-07-31 20:34:07 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-12 14:55:08 -0700
commite03f2e8a530e0ed46af43093e23a70b7c7215263 (patch)
tree69bc76da836e9953ab78c3aae22dac89fe7a21f8
parent93993a0a3e528357ae4b9b0eb82fd4b428ebbf64 (diff)
usb: hook up device authorization to sysfs
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 <inaky@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/core/sysfs.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 2ab222be8fd..e02590297d3 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -413,6 +413,44 @@ 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 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 = {