Makes it possible to control the authorization of USB devices through
sysfs's /sys/class/usb_dev/*/authorize.
Signed-off-by: Inaky Perez-Gonzalez <[EMAIL PROTECTED]>
---
drivers/usb/core/devio.c | 64 +++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 62 insertions(+), 2 deletions(-)
Index: linux.hg/drivers/usb/core/devio.c
===================================================================
--- linux.hg.orig/drivers/usb/core/devio.c 2007-05-23 19:45:56.000000000
-0700
+++ linux.hg/drivers/usb/core/devio.c 2007-05-23 19:54:39.000000000 -0700
@@ -1592,8 +1592,62 @@
.release = usbdev_release,
};
+
+/* 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 = dev->platform_data;
+ 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 = dev->platform_data;
+ 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;
+}
+
+DEVICE_ATTR(authorized, 0644,
+ usb_dev_authorized_show, usb_dev_authorized_store);
+
+
+/* Group all the USB bus attributes */
+static
+struct attribute *usb_dev_attrs[] = {
+ &dev_attr_authorized.attr,
+ NULL,
+};
+
+static
+struct attribute_group usb_dev_attr_group = {
+ .name = NULL, /* we want them in the same directory */
+ .attrs = usb_dev_attrs,
+};
+
+
static int usbdev_add(struct usb_device *dev)
{
+ int result;
int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
dev->usbfs_dev = device_create(usb_device_class, &dev->dev,
@@ -1601,13 +1655,19 @@
"usbdev%d.%d", dev->bus->busnum, dev->devnum);
if (IS_ERR(dev->usbfs_dev))
return PTR_ERR(dev->usbfs_dev);
-
dev->usbfs_dev->platform_data = dev;
- return 0;
+ result = sysfs_create_group(&dev->usbfs_dev->kobj, &usb_dev_attr_group);
+ if (result < 0) {
+ printk(KERN_ERR "Cannot register USB device attributes: %d\n",
+ result);
+ device_unregister(dev->usbfs_dev);
+ }
+ return result;
}
static void usbdev_remove(struct usb_device *dev)
{
+ sysfs_remove_group(&dev->usbfs_dev->kobj, &usb_dev_attr_group);
device_unregister(dev->usbfs_dev);
}
--
Inaky
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