https://github.com/ueno/libusb-gadget

Simple wrapper library to access Linux USB GadgetFS
https://github.com/ueno/libusb-gadget

Last synced: 15 days ago
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Simple wrapper library to access Linux USB GadgetFS

• Host: GitHub
• URL: https://github.com/ueno/libusb-gadget
• Owner: ueno
• License: lgpl-3.0
• Created: 2009-05-18T05:32:39.000Z (over 15 years ago)
• Default Branch: master
• Last Pushed: 2009-06-29T02:21:25.000Z (over 15 years ago)
• Last Synced: 2024-10-13T08:12:57.186Z (30 days ago)
• Language: C
• Homepage:
• Size: 91.8 KB
• Stars: 48
• Watchers: 7
• Forks: 10
• Open Issues: 2
• Metadata Files:
  • Readme: README
  • License: COPYING.LESSER

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README

        
* What's this?

libusb-gadget is a simple wrapper around Linux USB GadgetFS[1], which enables

USB target development in userspace.  It allows developers to write a

trivial gadget in ~200 lines, while the original GadgetFS example[2]

is ~1700 lines.

* Requirements

- linux 2.6.XX

* Quick start

I assume that you are using Debian GNU/Linux.  Since the USB gadget

framework is not compiled in the stock kernel (as of 2.6.29-1), you

will need to generate a couple of kernel modules by hand:

 $ sudo apt-get install linux-source-2.6.XX linux-headers-2.6.XX

 $ cd /usr/src

 $ tar xf linux-source-2.6.XX.tar.bz2

 $ cd libusb-gadget/scripts

 $ ./generate-kernel-modules /usr/src/linux-source-2.6.XX

After successful build, you will find "dummy_hcd.ko" and

"gadgetfs.ko" in the current working directory.  You can load them with:

 $ sudo insmod dummy_hcd.ko

 $ sudo insmod gadgetfs.ko

and mount the GadgetFS:

 $ sudo mkdir /dev/gadget

 $ sudo mount -t gadgetfs none /dev/gadget

Now you can try libusb-gadget.

 $ cd libusb-gadget

 $ ./configure

 $ make

tests/ contains an example gadget.

 $ cd tests

 $ sudo ./loopback 00FF:0000 # VEND:PROD

On another terminal:

 $ cd libusb-gadget/tests

 $ sudo ./loopback-test 00FF:0000 # VEND:PROD

* Limitations

- Multithreading is necessary since /dev/gadget/$ENDPOINT (except for

  ep0) do not support polling.

- The endpoint number in the endpoint descriptor must be specified

  explicitly, while the kernel space API assigns them automatically.

- The max packet size is also mandatory in that descriptor.

* License

LGPLv3+.  See COPYING.LESSER for detail.

Footnotes: 

[1]  http://www.linux-usb.org/gadget/

[2]  http://www.linux-usb.org/gadget/usb.c

* Copyright

All files are under the copyright of:

Copyright (C) 2009 Daiki Ueno 

except src/usbstring.[ch] which are based on the version by David

Brownell and under the copyright of:

Copyright (C) 2003 David Brownell