Hi,
I was making some experiments with gadgetfs in combination with
dummy_hcd (kernel vers. 2.6.12) and libusb (vers. 0.1.10a). First I was
analyzing the example userspace driver (usb.c). Then I wrote a couple of
my own small tests and most of it worked quite like expected (great work
folks, thanks) with one exception:
When I reopen a file representing a "normal" endpoint (e.g. "ep-a") and
try to configure it (by writing the descriptors to it), I always get
"Invalid argument" error.
(I thought that the configure/close works like the enable/disable for
endpoints ?!?)
I looked at the gadget/inode.c to understand more and found the
functions ep_config and ep_release, which appears to be called on
configuring (first time writing) and closing an endpoint-file. It did
strike me (without understanding too much of it yet) that unlike
ep_config, which calls usb_endpoint_enable, the ep_release doesn't call
usb_endpoint_disable as I would expect. After I added the call,
everything seems to work fine.
Could someone please check, if it was just forgotten or it's on purpose
that way.
If someone is interested I can send an example code that can reproduce
this behavior.
Greetings,
Pavol.
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