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Re: [Multitouch-device-support]Decided if one usb-hid panel should be supported by hid-multitouch?


Hi anonymous

(am I the only one who has a hard time finding who has written messages sent to this list?)

A few of these fields are necessary only. We have working code (but not clean enough yet to be submitted) that detects multitouch devices so as to use hid-multitouch automatically, and we rely on a sentence in a Win7 document that says in essence that '0x51 means multitouch'. Of course, to be any useful at all the device needs to report X and Y too :-) We also usually rely on TipSwitch.

You can get the information from the device by using 'lsusb -v', but only after telling usbhid to stop grabbing the device (otherwise you are not allowed to query the report descriptors and you get an *UNAVAILABLE* message). There's a script for this in a howto on our web site (http://lii-enac.fr/en/architecture/linux-input/multitouch-howto.html).

(Benjamin, correct me if I'm any wrong, I'm talking from my memories).



Le 29 avr. 2011 à 13:08, multi-touch-dev-bounces+chatty=enac.fr@xxxxxxxxxxxxxxxxxxx a écrit :

> Hi, list,
> From archive of this ML, I found Henrik Rydberg had mentioned (as answer to someone's question):
> ===quote===
> > Where is the correct place in kernel for the multi-touch input support? 
> It depends on your device. If it supports win7 HID extensions for 
> digitizers, adding it to hid-multitouch makes sense. If it is a HID 
> device but it does not quite fit, then it is a new hid driver (which 
> is really discouraged at this point). If it is general usb, 
> then somewhere under drivers/input - there are MT drivers in touchscreen, 
> tablet and mouse.
> ===end of quote === 
> 1 So here for multitouch, "win 7 HID extensions" is exactly pointing to the below 8 usages supporting?
> 0x47 Touch valid
> 0x48 Width
> 0x49 Height
> 0x51 Contact identifier
> 0x52 Device mode
> 0x53 Device identifier
> 0x54 Contact count
> 0x55 Contact count maximum
> 2 For letting hid-mutitouch.c support one device, this device must support all above 8 usages or just few of them, say 0x47/0x51/0x54 are enough?
> 3 And how can one know if his device is "win 7 HID extensions" by simple way, say 'lsusb -v'?
> Thanks for your time and feedback. 
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