On Fri, Feb 24, 2012 at 7:32 AM, Przemo Firszt <prz...@firszt.eu> wrote:
> Dnia 2012-02-23, czw o godzinie 21:19 -0600, Chris Bagwell pisze:
>> On Wed, Feb 22, 2012 at 3:21 PM, Przemo Firszt <prz...@firszt.eu> wrote:
>> [..]
>
>> __set_bit(ABS_MISC, input->absbit);
>>
>> So in your copy, it is already setting MSC_SERIAL bit, you've added
>> code to send it, and xf86-input-wacom is still forcing it to a value
>> of 1?
>
> Yes, that what was happening. See this (wcmUSB.c):
> if (common->wcmProtocolLevel == WCM_PROTOCOL_GENERIC)
> {
> /* Generic Protocol devices do not use any form of
> * serial #'s to multiplex events over a single input
> * and so can always map to channel 0. This means
> * only 1 tool can ever been in proximity at one time
> * (MT events are special case handled elsewhere).
> * It also means all buttons must be associated with
> * a single tool and can not send tablet buttons
> * as part of a pad tool.
> */
> channel = 0;
> serial = 1;
>
> /* Generic devices need to map stylus buttons to
> "channel"
> * and all other button presses to PAD. Hardcode PAD
> * channel here.
> */
> private->wcmBTNChannel = PAD_CHANNEL;
> }
>
Thanks. I should probably delete the serial = 1 part at some point.
The important part in that line is channel = 0.
At some point, I'd like to unify this function that computes channel #
for protocol 4, protocol 5, and generic devices. Protocol 5 does a
lookup into an array of size 3 to find channel with matching serial #
or empty channel. For protocol 4, kernel driver hard codes to serial
= 1 or 0xff and driver converts to channel 0 or 1. For generic,
kernel driver either never sends/declares a serial # (so same as
sending zero to xf86-input-wacom) or behaves like protocol 5 but we
hard always code to channel 0.
In all cases, we can use lookup table approach with serial # as key.
Chris
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