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What: /sys/bus/usb/drivers/wusb_cbaf/.../wusb_*
Date: August 2008
KernelVersion: 2.6.27
Contact: David Vrabel <david.vrabel@csr.com>
Description:
Various files for managing Cable Based Association of
(wireless) USB devices.
The sequence of operations should be:
1. Device is plugged in.
2. The connection manager (CM) sees a device with CBA capability.
(the wusb_chid etc. files in /sys/devices/blah/OURDEVICE).
3. The CM writes the host name, supported band groups,
and the CHID (host ID) into the wusb_host_name,
wusb_host_band_groups and wusb_chid files. These
get sent to the device and the CDID (if any) for
this host is requested.
4. The CM can verify that the device's supported band
groups (wusb_device_band_groups) are compatible
with the host.
5. The CM reads the wusb_cdid file.
6. The CM looks it up its database.
- If it has a matching CHID,CDID entry, the device
has been authorized before and nothing further
needs to be done.
- If the CDID is zero (or the CM doesn't find a
matching CDID in its database), the device is
assumed to be not known. The CM may associate
the host with device by: writing a randomly
generated CDID to wusb_cdid and then a random CK
to wusb_ck (this uploads the new CC to the
device).
CMD may choose to prompt the user before
associating with a new device.
7. Device is unplugged.
References:
[WUSB-AM]
Association Models Supplement to the
Certified Wireless Universal Serial Bus
Specification, version 1.0.
What: /sys/bus/usb/drivers/wusb_cbaf/.../wusb_chid
Date: August 2008
KernelVersion: 2.6.27
Contact: David Vrabel <david.vrabel@csr.com>
Description:
The CHID of the host formatted as 16 space-separated
hex octets.
Writes fetches device's supported band groups and the
the CDID for any existing association with this host.
What: /sys/bus/usb/drivers/wusb_cbaf/.../wusb_host_name
Date: August 2008
KernelVersion: 2.6.27
Contact: David Vrabel <david.vrabel@csr.com>
Description:
A friendly name for the host as a UTF-8 encoded string.
What: /sys/bus/usb/drivers/wusb_cbaf/.../wusb_host_band_groups
Date: August 2008
KernelVersion: 2.6.27
Contact: David Vrabel <david.vrabel@csr.com>
Description:
The band groups supported by the host, in the format
defined in [WUSB-AM].
What: /sys/bus/usb/drivers/wusb_cbaf/.../wusb_device_band_groups
Date: August 2008
KernelVersion: 2.6.27
Contact: David Vrabel <david.vrabel@csr.com>
Description:
The band groups supported by the device, in the format
defined in [WUSB-AM].
What: /sys/bus/usb/drivers/wusb_cbaf/.../wusb_cdid
Date: August 2008
KernelVersion: 2.6.27
Contact: David Vrabel <david.vrabel@csr.com>
Description:
The device's CDID formatted as 16 space-separated hex
octets.
What: /sys/bus/usb/drivers/wusb_cbaf/.../wusb_ck
Date: August 2008
KernelVersion: 2.6.27
Contact: David Vrabel <david.vrabel@csr.com>
Description:
Write 16 space-separated random, hex octets to
associate with the device.
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