[PATCH] USB: add modalias sysfs file for usb devices
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index ec9b3bd..4ab5000 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -286,6 +286,39 @@
}
static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
+static ssize_t show_modalias(struct device *dev, char *buf)
+{
+ struct usb_interface *intf;
+ struct usb_device *udev;
+
+ intf = to_usb_interface(dev);
+ udev = interface_to_usbdev(intf);
+ if (udev->descriptor.bDeviceClass == 0) {
+ struct usb_host_interface *alt = intf->cur_altsetting;
+
+ return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic%02Xisc%02Xip%02X\n",
+ le16_to_cpu(udev->descriptor.idVendor),
+ le16_to_cpu(udev->descriptor.idProduct),
+ le16_to_cpu(udev->descriptor.bcdDevice),
+ udev->descriptor.bDeviceClass,
+ udev->descriptor.bDeviceSubClass,
+ udev->descriptor.bDeviceProtocol,
+ alt->desc.bInterfaceClass,
+ alt->desc.bInterfaceSubClass,
+ alt->desc.bInterfaceProtocol);
+ } else {
+ return sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic*isc*ip*\n",
+ le16_to_cpu(udev->descriptor.idVendor),
+ le16_to_cpu(udev->descriptor.idProduct),
+ le16_to_cpu(udev->descriptor.bcdDevice),
+ udev->descriptor.bDeviceClass,
+ udev->descriptor.bDeviceSubClass,
+ udev->descriptor.bDeviceProtocol);
+ }
+
+}
+static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL);
+
static struct attribute *intf_attrs[] = {
&dev_attr_bInterfaceNumber.attr,
&dev_attr_bAlternateSetting.attr,
@@ -293,6 +326,7 @@
&dev_attr_bInterfaceClass.attr,
&dev_attr_bInterfaceSubClass.attr,
&dev_attr_bInterfaceProtocol.attr,
+ &dev_attr_modalias.attr,
NULL,
};
static struct attribute_group intf_attr_grp = {