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usb: gadget: configfs: OS Extended Properties descriptors support

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Add handling of OS Extended Properties descriptors from configfs interface.
One kind of "OS Descriptors" are "Extended Properties" descriptors, which
need to be specified per interface or per group of interfaces described
by an IAD. This patch adds support for creating subdirectories
in interface.<n> directory located in the function's directory.
Names of subdirectories created become names of properties.
Each property contains two attributes: "type" and "data".
The type can be a numeric value 1..7 while data is a blob interpreted
depending on the type specified.
The types are:
1 - unicode string
2 - unicode string with environment variables
3 - binary
4 - little-endian 32-bit
5 - big-endian 32-bit
6 - unicode string with a symbolic link
7 - multiple unicode strings

Signed-off-by: Andrzej Pietrasiewicz <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>
This commit is contained in:
Andrzej Pietrasiewicz 2014-05-08 14:06:28 +02:00 • committed by Felipe Balbi
commit 7419485f19
3 changed files with 226 additions and 0 deletions
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21
Documentation/ABI/testing/configfs-usb-gadget
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@ -75,6 +75,27 @@ Description:
compatible_id - 8-byte string for "Compatible ID"
sub_compatible_id - 8-byte string for "Sub Compatible ID"
What: /config/usb-gadget/gadget/functions/<func>.<inst>/interface.<n>/<property>
Date: May 2014
KernelVersion: 3.16
Description:
This group contains "Extended Property Descriptors" specific for one
gadget's USB interface or one interface group described
by an IAD.
The attributes:
type - value 1..7 for interpreting the data
1: unicode string
2: unicode string with environment variable
3: binary
4: little-endian 32-bit
5: big-endian 32-bit
6: unicode string with a symbolic link
7: multiple unicode strings
data - blob of data to be interpreted depending on
type
What: /config/usb-gadget/gadget/strings
Date: Jun 2013
KernelVersion: 3.11