mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 15:43:59 +08:00
c8cf2465fc
Add some brief documentation on the UWB and WUSB related sysfs files. Signed-off-by: David Vrabel <david.vrabel@csr.com>
101 lines
3.9 KiB
Plaintext
101 lines
3.9 KiB
Plaintext
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.
|