Messages in this thread |  | | | Date | Sat, 29 Jan 2011 00:36:38 -0800 | | From | Dmitry Torokhov <> | | Subject | Re: USB HID plug and play, hardware developer frustration |
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Ho Robin,
On Sat, Jan 29, 2011 at 09:15:11AM +0100, Robin Theunis wrote: > 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().
> 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
> 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
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