Re: USB HID plug and play, hardware developer frustration

Hi Devs, Dmitry

Oh, there is some support for digitizers. That will help me a lot!
Some thing else. When releasing my product how do I "ship" my driver?
Or do I need to hope that it will be included in the kernel?

Thanks

Robin

2011/1/29 Dmitry Torokhov [off-list ref]:

Ho Robin,

On Sat, Jan 29, 2011 at 09:15:11AM +0100, Robin Theunis wrote:

quoted

Hi Devs,

Currently I am design a USB product, and in that process I also look
if almost every OS supports my device.
The device is just only a HID digitizer or touch tablet thingy. It
reports it self also as HID device. This is to have it
work PLUG and PLAY. But I gotten a cold shower when trying this on my
linux pcs. It doesn't work!
I did some investigation and found that the linux (kernel) only
support mouses and keyboard, all the other usage pages
that are included in the USB HID specs aren't implemented.
http://www.usb.org/developers/devclass_docs/Hut1_11.pdf

Is there a reason why they aren't implemented? especially the
digitizer thingies because of all the new tablets?

Linux HID driver does have code to handle digitizers, please take a look
at drivers/hid/hid-input.c::hidinput_configure_usage().

quoted

Is it difficult
to make a driver to support my device?

It should not be. You might need to tweak usage mappings a bit by the
way of writing small HID sub-driver. Look for examples in
drivers/hid/hid-<vendor>.c

If you need additional help I'd recommend asking on
linux-input@vger.kernel.org

quoted

I have seen that there are a
lot of wacom drivers, I think doing all the same thing.

Wacoms are quite different since they are not HID devices but handler by
a completely separate driver.

Thanks.

--
Dmitry