@@ -166,6 +166,22 @@ Description:
The file will be present for all speeds of USB devices, and will
always read "no" for USB 1.1 and USB 2.0 devices.
+What: /sys/bus/usb/devices/<INTERFACE>/wireless_status
+Date: March 2023
+Contact: Bastien Nocera <hadess@hadess.net>
+Description:
+ Some USB devices use a USB receiver dongle to communicate wirelessly
+ with their device using proprietary protocols. This attribute allows
+ user-space to know whether the device is connected to its receiver
+ dongle, and, for example, consider the device to be absent when choosing
+ whether to show the device's battery, show a headset in a list of
+ outputs, or show an on-screen keyboard if the only wireless keyboard
+ is turned off.
+ This attribute is not to be used to replace protocol specific statuses
+ available in WWAN, WLAN/Wi-Fi, Bluetooth, etc.
+ If the device does not use a receiver dongle with a wireless device,
+ then this attribute will not exist.
+
What: /sys/bus/usb/devices/.../<hub_interface>/port<X>
Date: August 2012
Contact: Lan Tianyu <tianyu.lan@intel.com>
@@ -1232,9 +1232,59 @@ static const struct attribute_group intf_assoc_attr_grp = {
.is_visible = intf_assoc_attrs_are_visible,
};
+static ssize_t wireless_status_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf;
+
+ intf = to_usb_interface(dev);
+ if (intf->wireless_status == USB_WIRELESS_STATUS_DISCONNECTED)
+ return sysfs_emit(buf, "%s\n", "disconnected");
+ return sysfs_emit(buf, "%s\n", "connected");
+}
+static DEVICE_ATTR_RO(wireless_status);
+
+static struct attribute *intf_wireless_status_attrs[] = {
+ &dev_attr_wireless_status.attr,
+ NULL
+};
+
+static umode_t intf_wireless_status_attr_is_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct usb_interface *intf = to_usb_interface(dev);
+
+ if (a != &dev_attr_wireless_status.attr ||
+ intf->wireless_status != USB_WIRELESS_STATUS_NA)
+ return a->mode;
+ return 0;
+}
+
+static const struct attribute_group intf_wireless_status_attr_grp = {
+ .attrs = intf_wireless_status_attrs,
+ .is_visible = intf_wireless_status_attr_is_visible,
+};
+
+int usb_update_wireless_status_attr(struct usb_interface *intf)
+{
+ struct device *dev = &intf->dev;
+ int ret;
+
+ ret = sysfs_update_group(&dev->kobj, &intf_wireless_status_attr_grp);
+ if (ret < 0)
+ return ret;
+
+ sysfs_notify(&dev->kobj, NULL, "wireless_status");
+ kobject_uevent(&dev->kobj, KOBJ_CHANGE);
+
+ return 0;
+}
+
const struct attribute_group *usb_interface_groups[] = {
&intf_attr_grp,
&intf_assoc_attr_grp,
+ &intf_wireless_status_attr_grp,
NULL
};
@@ -15,6 +15,7 @@ extern int usb_create_sysfs_dev_files(struct usb_device *dev);
extern void usb_remove_sysfs_dev_files(struct usb_device *dev);
extern void usb_create_sysfs_intf_files(struct usb_interface *intf);
extern void usb_remove_sysfs_intf_files(struct usb_interface *intf);
+extern int usb_update_wireless_status_attr(struct usb_interface *intf);
extern int usb_create_ep_devs(struct device *parent,
struct usb_host_endpoint *endpoint,
struct usb_device *udev);
@@ -170,6 +170,12 @@ usb_find_last_int_out_endpoint(struct usb_host_interface *alt,
return usb_find_common_endpoints_reverse(alt, NULL, NULL, NULL, int_out);
}
+enum usb_wireless_status {
+ USB_WIRELESS_STATUS_NA = 0,
+ USB_WIRELESS_STATUS_DISCONNECTED,
+ USB_WIRELESS_STATUS_CONNECTED,
+};
+
/**
* struct usb_interface - what usb device drivers talk to
* @altsetting: array of interface structures, one for each alternate
@@ -203,6 +209,8 @@ usb_find_last_int_out_endpoint(struct usb_host_interface *alt,
* @reset_ws: Used for scheduling resets from atomic context.
* @resetting_device: USB core reset the device, so use alt setting 0 as
* current; needs bandwidth alloc after reset.
+ * @wireless_status: if the USB device uses a receiver/emitter combo, whether
+ * the emitter is connected.
*
* USB device drivers attach to interfaces on a physical device. Each
* interface encapsulates a single high level function, such as feeding
@@ -253,6 +261,7 @@ struct usb_interface {
unsigned needs_binding:1; /* needs delayed unbind/rebind */
unsigned resetting_device:1; /* true: bandwidth alloc after reset */
unsigned authorized:1; /* used for interface authorization */
+ enum usb_wireless_status wireless_status;
struct device dev; /* interface specific device info */
struct device *usb_dev;
Add a wireless_status sysfs attribute to USB devices to keep track of whether a USB device that's comprised of a receiver dongle and an emitter device over a, most of the time proprietary, wireless link has its emitter connected or disconnected. This will be used by user-space OS components to determine whether the battery-powered part of the device is wirelessly connected or not, allowing, for example: - upower to hide the battery for devices where the device is turned off but the receiver plugged in, rather than showing 0%, or other values that could be confusing to users - Pipewire to hide a headset from the list of possible inputs or outputs or route audio appropriately if the headset is suddenly turned off, or turned on - libinput to determine whether a keyboard or mouse is present when its receiver is plugged in. This is done at the USB interface level as: - the interface on which the wireless status is detected is sometimes not the same as where it could be consumed (eg. the audio interface on a headset dongle will still appear even if the headset is turned off), and we cannot have synchronisation of status across subsystems. - this behaviour is not specific to HID devices, even if the protocols used to determine whether or not the remote device is connected can be HID. This is not an attribute that is meant to replace protocol specific APIs, such as the ones available for WWAN, WLAN/Wi-Fi, or Bluetooth or any other sort of networking, but solely for wireless devices with an ad-hoc “lose it and your device is e-waste” receiver dongle. The USB interface will only be exporting the wireless_status sysfs attribute if it gets set through the API exported in the next commit. Signed-off-by: Bastien Nocera <hadess@hadess.net> --- Updated commit message and documentation in v2 so that the commit doesn't need to reference older discussions. Documentation/ABI/testing/sysfs-bus-usb | 16 ++++++++ drivers/usb/core/sysfs.c | 50 +++++++++++++++++++++++++ drivers/usb/core/usb.h | 1 + include/linux/usb.h | 9 +++++ 4 files changed, 76 insertions(+)