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usb: gadget: configfs: OS String support

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Add handling of OS String extension from the configfs interface.
A directory "os_desc" is added at the top level of a gadget's
directories hierarchy. In the "os_desc" directory there are
three attributes: "use", "b_vendor_code" and "qw_sign".
If "use" contains "0" the OS string is not reported to the host.
"b_vendor_code" contains a one-byte value which is used
for custom per-device and per-interface requests.
"qw_sign" contains an identifier to be reported as the "OS String"
proper.

Signed-off-by: Andrzej Pietrasiewicz <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>
This commit is contained in:
Andrzej Pietrasiewicz 2014-05-08 14:06:25 +02:00 • committed by Felipe Balbi
commit 87213d388e
2 changed files with 169 additions and 1 deletions
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11
Documentation/ABI/testing/configfs-usb-gadget
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@ -79,3 +79,14 @@ Description:
product - gadget's product description
manufacturer - gadget's manufacturer description
What: /config/usb-gadget/gadget/os_desc
Date: May 2014
KernelVersion: 3.16
Description:
This group contains "OS String" extension handling attributes.
use - flag turning "OS Desctiptors" support on/off
b_vendor_code - one-byte value used for custom per-device and
per-interface requests
qw_sign - an identifier to be reported as "OS String"
proper