1 What: /sys/bus/wmi/devices/.../driver_override
3 Contact: Armin Wolf <W_Armin@gmx.de>
5 This file allows the driver for a device to be specified which
6 will override standard ID table matching.
7 When specified, only a driver with a name matching the value
8 written to driver_override will have an opportunity to bind
10 The override is specified by writing a string to the
11 driver_override file (echo wmi-event-dummy > driver_override).
12 The override may be cleared with an empty string (echo > \
13 driver_override) which returns the device to standard matching
15 Writing to driver_override does not automatically unbind the
16 device from its current driver or make any attempt to automatically
17 load the specified driver. If no driver with a matching name is
18 currently loaded in the kernel, the device will not bind to any
20 This also allows devices to opt-out of driver binding using a
21 driver_override name such as "none". Only a single driver may be
22 specified in the override, there is no support for parsing delimiters.
24 What: /sys/bus/wmi/devices/.../modalias
26 Contact: Andy Lutomirski <luto@kernel.org>
28 This file contains the MODALIAS value emitted by uevent for a
31 Format: wmi:XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX.
33 What: /sys/bus/wmi/devices/.../guid
35 Contact: Andy Lutomirski <luto@kernel.org>
37 This file contains the GUID used to match WMI devices to
38 compatible WMI drivers. This GUID is not necessarily unique
39 inside a given machine, it is solely used to identify the
40 interface exposed by a given WMI device.
42 What: /sys/bus/wmi/devices/.../object_id
44 Contact: Andy Lutomirski <luto@kernel.org>
46 This file contains the WMI object ID used internally to construct
47 the ACPI method names used by non-event WMI devices. It contains
50 What: /sys/bus/wmi/devices/.../notify_id
52 Contact: Andy Lutomirski <luto@kernel.org>
54 This file contains the WMI notify ID used internally to map ACPI
55 events to WMI event devices. It contains two ASCII letters.
57 What: /sys/bus/wmi/devices/.../instance_count
59 Contact: Andy Lutomirski <luto@kernel.org>
61 This file contains the number of WMI object instances being
62 present on a given WMI device. It contains a non-negative
65 What: /sys/bus/wmi/devices/.../expensive
67 Contact: Andy Lutomirski <luto@kernel.org>
69 This file contains a boolean flag signaling if interacting with
70 the given WMI device will consume significant CPU resources.
71 The WMI driver core will take care of enabling/disabling such
74 What: /sys/bus/wmi/devices/.../setable
76 Contact: Darren Hart (VMware) <dvhart@infradead.org>
78 This file contains a boolean flags signaling the data block
79 aassociated with the given WMI device is writable. If the
80 given WMI device is not associated with a data block, then
81 this file will not exist.