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authorAndrzej Pietrasiewicz <andrzej.p@samsung.com>2014-05-08 14:06:26 +0200
committerFelipe Balbi <balbi@ti.com>2014-05-14 09:39:25 -0500
commitda4243145fb197622425d4c2feff5d6422f2391e (patch)
tree83405fcd69a4ae077c3364f584ab90b1314449a3 /Documentation/ABI
parent87213d388e927aaa88b21d5ff7e1f75ca2288da1 (diff)
downloadlinux-da4243145fb197622425d4c2feff5d6422f2391e.tar.bz2
usb: gadget: configfs: OS Extended Compatibility descriptors support
Add handling of OS Extended Compatibility descriptors from configfs interface. Hosts which expect the "OS Descriptors" ask only for configurations @ index 0, but linux-based USB devices can provide more than one configuration. This patch adds marking one of gadget's configurations the configuration to be reported at index 0, regardless of the actual sequence of usb_add_config invocations used for adding the configurations. The configuration is selected by creating a symbolic link pointing to it from the "os_desc" directory located at the top of a gadget's directory hierarchy. One kind of "OS Descriptors" are "Extended Compatibility Descriptors", which need to be specified per interface. This patch adds interface.<n> directory in function's configfs directory to represent each interface defined by the function. Each interface's directory contains two attributes: "compatible_id" and "sub_compatible_id", which represent 8-byte strings to be reported to the host as the "Compatible ID" and "Sub Compatible ID". Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'Documentation/ABI')
-rw-r--r--Documentation/ABI/testing/configfs-usb-gadget13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/configfs-usb-gadget b/Documentation/ABI/testing/configfs-usb-gadget
index 0e7b786f24ac..5c0b3e6eb981 100644
--- a/Documentation/ABI/testing/configfs-usb-gadget
+++ b/Documentation/ABI/testing/configfs-usb-gadget
@@ -62,6 +62,19 @@ KernelVersion: 3.11
Description:
This group contains functions available to this USB gadget.
+What: /config/usb-gadget/gadget/functions/<func>.<inst>/interface.<n>
+Date: May 2014
+KernelVersion: 3.16
+Description:
+ This group contains "Feature Descriptors" specific for one
+ gadget's USB interface or one interface group described
+ by an IAD.
+
+ The attributes:
+
+ compatible_id - 8-byte string for "Compatible ID"
+ sub_compatible_id - 8-byte string for "Sub Compatible ID"
+
What: /config/usb-gadget/gadget/strings
Date: Jun 2013
KernelVersion: 3.11