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