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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.