With the move to configfs for creation of arbitrary USB composite gadgets,
I found myself wanting a simple C library to configure and parse gadgets
in a system. It has no other dependencies other than libc itself.
It can be found at:
git://git.linaro.org/people/mporter/libgadget.git
Doxygen docs on API and examples at:
http://people.linaro.org/~matt.porter/libgadget/group__libgadget.html
http://people.linaro.org/~matt.porter/libgadget/examples.html
Output from the examples:
$ mkdir /config
$ mount -t configfs none /config
$ gadget-acm-ecm
$ show-gadgets
ID 1d6b:0104 'g1'
UDC 3f120000.usbotg
bDeviceClass 0x00
bDeviceSubClass 0x00
bDeviceProtocol 0x00
bMaxPacketSize0 0x40
bcdDevice 0x0311
bcdUSB 0x0000
idVendor 0x1d6b
idProduct 0x0104
Serial Number 0123456789
Manufacturer Foo Inc.
Product Bar Gadget
Function 'acm.usb0'
port_num 0
Function 'acm.usb1'
port_num 1
Function 'ecm.usb0'
dev_addr 32:1b:dc:a4:bc:a2
host_addr 82:b7:58:62:f6:31
ifname usb0
qmult 5
Configuration 'c.1'
MaxPower 2
bmAttributes 0x80
configuration CDC 2xACM+ECM
acm.GS0 -> acm.usb0
acm.GS1 -> acm.usb0
ecm.usb0 -> ecm.usb0
Besides things noted in the todo list, I'm working on a gadgettool
on top of libgadget to make life easier for everyday creation of
common composite devices. e.g. gadgettool --create="g1" --function="acm"
--function="ecm" --enable
-Matt
On Wednesday 2013-09-04 19:25, Matt Porter wrote:
>With the move to configfs for creation of arbitrary USB composite gadgets,
>I found myself wanting a simple C library to configure and parse gadgets
>in a system. It has no other dependencies other than libc itself.
>
>It can be found at:
>
> git://git.linaro.org/people/mporter/libgadget.git
Hm but there is already a libgadget (and not just one) if you query a
particular search engine entitled Google :}
>$ mkdir /config
>$ mount -t configfs none /config
Do your tools support input of a different location?
(systemd mounts configfs at /sys/kernel/config.)
>$ gadget-acm-ecm
>$ show-gadgets
>ID 1d6b:0104 'g1'
>[...]
On 09/11/2013 03:42 AM, Jan Engelhardt wrote:
> On Wednesday 2013-09-04 19:25, Matt Porter wrote:
>
>> With the move to configfs for creation of arbitrary USB composite gadgets,
>> I found myself wanting a simple C library to configure and parse gadgets
>> in a system. It has no other dependencies other than libc itself.
>>
>> It can be found at:
>>
>> git://git.linaro.org/people/mporter/libgadget.git
>
> Hm but there is already a libgadget (and not just one) if you query a
> particular search engine entitled Google :}
Yes, looked a bit at this before and both were seemingly defunct.
However, to avoid confusion, the 0.0.2 release is becoming libusbg.
>
>> $ mkdir /config
>> $ mount -t configfs none /config
>
> Do your tools support input of a different location?
> (systemd mounts configfs at /sys/kernel/config.)
>
>> $ gadget-acm-ecm
>> $ show-gadgets
>> ID 1d6b:0104 'g1'
>> [...]
>
Also being addressed in 0.0.2. One of my test platforms is now using a
systemd-based rootfs so it became readily apparent. Hopefully I'll have
that release tagged in a few days.
Thanks for taking a look!
-Matt