1What:           /sys/bus/usb/drivers/wusb_cbaf/.../wusb_*
2Date:           August 2008
3KernelVersion:  2.6.27
4Contact:        David Vrabel <david.vrabel@csr.com>
5Description:
6                Various files for managing Cable Based Association of
7                (wireless) USB devices.
8
9                The sequence of operations should be:
10
11                1. Device is plugged in.
12
13                2. The connection manager (CM) sees a device with CBA capability.
14                   (the wusb_chid etc. files in /sys/devices/blah/OURDEVICE).
15
16                3. The CM writes the host name, supported band groups,
17                   and the CHID (host ID) into the wusb_host_name,
18                   wusb_host_band_groups and wusb_chid files. These
19                   get sent to the device and the CDID (if any) for
20                   this host is requested.
21
22                4. The CM can verify that the device's supported band
23                   groups (wusb_device_band_groups) are compatible
24                   with the host.
25
26                5. The CM reads the wusb_cdid file.
27
28                6. The CM looks it up its database.
29
30                   - If it has a matching CHID,CDID entry, the device
31                     has been authorized before and nothing further
32                     needs to be done.
33
34                   - If the CDID is zero (or the CM doesn't find a
35                     matching CDID in its database), the device is
36                     assumed to be not known.  The CM may associate
37                     the host with device by: writing a randomly
38                     generated CDID to wusb_cdid and then a random CK
39                     to wusb_ck (this uploads the new CC to the
40                     device).
41
42                     CMD may choose to prompt the user before
43                     associating with a new device.
44
45                7. Device is unplugged.
46
47                References:
48                  [WUSB-AM] Association Models Supplement to the
49                            Certified Wireless Universal Serial Bus
50                            Specification, version 1.0.
51
52What:           /sys/bus/usb/drivers/wusb_cbaf/.../wusb_chid
53Date:           August 2008
54KernelVersion:  2.6.27
55Contact:        David Vrabel <david.vrabel@csr.com>
56Description:
57                The CHID of the host formatted as 16 space-separated
58                hex octets.
59
60                Writes fetches device's supported band groups and the
61                the CDID for any existing association with this host.
62
63What:           /sys/bus/usb/drivers/wusb_cbaf/.../wusb_host_name
64Date:           August 2008
65KernelVersion:  2.6.27
66Contact:        David Vrabel <david.vrabel@csr.com>
67Description:
68                A friendly name for the host as a UTF-8 encoded string.
69
70What:           /sys/bus/usb/drivers/wusb_cbaf/.../wusb_host_band_groups
71Date:           August 2008
72KernelVersion:  2.6.27
73Contact:        David Vrabel <david.vrabel@csr.com>
74Description:
75                The band groups supported by the host, in the format
76                defined in [WUSB-AM].
77
78What:           /sys/bus/usb/drivers/wusb_cbaf/.../wusb_device_band_groups
79Date:           August 2008
80KernelVersion:  2.6.27
81Contact:        David Vrabel <david.vrabel@csr.com>
82Description:
83                The band groups supported by the device, in the format
84                defined in [WUSB-AM].
85
86What:           /sys/bus/usb/drivers/wusb_cbaf/.../wusb_cdid
87Date:           August 2008
88KernelVersion:  2.6.27
89Contact:        David Vrabel <david.vrabel@csr.com>
90Description:
91                The device's CDID formatted as 16 space-separated hex
92                octets.
93
94What:           /sys/bus/usb/drivers/wusb_cbaf/.../wusb_ck
95Date:           August 2008
96KernelVersion:  2.6.27
97Contact:        David Vrabel <david.vrabel@csr.com>
98Description:
99                Write 16 space-separated random, hex octets to
100                associate with the device.
101