uwb: document UWB and WUSB sysfs files
[linux-2.6.git] / Documentation / ABI / testing / sysfs-class-usb_host
1 What:           /sys/class/usb_host/usb_hostN/wusb_chid
2 Date:           July 2008
3 KernelVersion:  2.6.27
4 Contact:        David Vrabel <david.vrabel@csr.com>
5 Description:
6                 Write the CHID (16 space-separated hex octets) for this host controller.
7                 This starts the host controller, allowing it to accept connection from
8                 WUSB devices.
9
10                 Set an all zero CHID to stop the host controller.
11
12 What:           /sys/class/usb_host/usb_hostN/wusb_trust_timeout
13 Date:           July 2008
14 KernelVersion:  2.6.27
15 Contact:        David Vrabel <david.vrabel@csr.com>
16 Description:
17                 Devices that haven't sent a WUSB packet to the host
18                 within 'wusb_trust_timeout' ms are considered to have
19                 disconnected and are removed.  The default value of
20                 4000 ms is the value required by the WUSB
21                 specification.
22
23                 Since this relates to security (specifically, the
24                 lifetime of PTKs and GTKs) it should not be changed
25                 from the default.