Userspace may want to make policy decisions based on whether or not a
given USB port is externally visible. Add a per-device member and support
for exposing it in sysfs. Information sources to populate it will be
added later.
Signed-off-by: Matthew Garrett <mjg@xxxxxxxxxx>
---
drivers/usb/core/sysfs.c | 23 +++++++++++++++++++++++
include/linux/usb.h | 8 ++++++++
2 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index cf05b97..de7ecb8 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -230,6 +230,28 @@ show_urbnum(struct device *dev, struct device_attribute *attr, char *buf)
}
static DEVICE_ATTR(urbnum, S_IRUGO, show_urbnum, NULL);
+static ssize_t
+show_visibility(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct usb_device *udev;
+ char *state;
+
+ udev = to_usb_device(dev);
+
+ switch (udev->visible) {
+ case USB_DEVICE_VISIBILITY_VISIBLE:
+ state = "visible";
+ break;
+ case USB_DEVICE_VISIBILITY_HIDDEN:
+ state = "hidden";
+ break;
+ default:
+ state = "unknown";
+ }
+
+ return sprintf(buf, "%s\n", state);
+}
+static DEVICE_ATTR(visibility, S_IRUGO, show_visibility, NULL);
#ifdef CONFIG_PM
@@ -569,6 +591,7 @@ static struct attribute *dev_attrs[] = {
&dev_attr_avoid_reset_quirk.attr,
&dev_attr_authorized.attr,
&dev_attr_remove.attr,
+ &dev_attr_visibility.attr,
NULL,
};
static struct attribute_group dev_attr_grp = {
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 73c7df4..57f50ff 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -366,6 +366,12 @@ struct usb_bus {
struct usb_tt;
+enum usb_device_visibility {
+ USB_DEVICE_VISIBILITY_UNKNOWN = 0,
+ USB_DEVICE_VISIBILITY_VISIBLE,
+ USB_DEVICE_VISIBILITY_HIDDEN,
+};
+
/**
* struct usb_device - kernel's representation of a USB device
* @devnum: device number; address on a USB bus
@@ -418,6 +424,7 @@ struct usb_tt;
* @wusb_dev: if this is a Wireless USB device, link to the WUSB
* specific data for the device.
* @slot_id: Slot ID assigned by xHCI
+ * @visible: Externally available port
*
* Notes:
* Usbcore drivers should not set usbdev->state directly. Instead use
@@ -491,6 +498,7 @@ struct usb_device {
#endif
struct wusb_dev *wusb_dev;
int slot_id;
+ enum usb_device_visibility visible;
};
#define to_usb_device(d) container_of(d, struct usb_device, dev)
--
1.7.6.4
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