[patch] ignore trackpad/mouse while typing

Till Straumann till.straumann at tu-berlin.de
Tue Jan 28 08:33:17 EST 2003

On Monday, January 27, 2003, at 08:25 , Vojtech Pavlik wrote:

> On Mon, Jan 27, 2003 at 08:16:24PM +0100, Franz Sirl wrote:
>> On Saturday 25 January 2003 22:29, Vojtech Pavlik wrote:
>>> On Sat, Jan 25, 2003 at 10:25:56PM +0100, Benjamin Herrenschmidt
>>> wrote:
>>>>>>> Well... the problem happpens in console as well, and with other
>>>>>>> non-X apps like MacOnLinux. Some Apple PowerBooks have
>>>>>>> over-sensitive trackpad. Apple themselves implement a similar
>>>>>>> mecanism in the kernel driver of OS X.
>>>>>>   Mine is one of those machines.  I have to turn off gpm for sure,
>>>>>> and X is quite oversensitive too (tuned it in KDE, but still this
>>>>>> functionality would be very nice).
>>>>> How about implementing it in mousedev.c?
>>>> Right, though it would need hooks in kbddev or something to know
>>>> about keystrokes.
>>> It could accept keyboards as an event source for this purpose. I'd
>>> like
>>> to keep this out of the input core.
>> Hmm, this reminds me of one feature I would need in the input core to
>> support
>> 1-button mices in userspace (or at least in a totally self-contained
>> module),
>> namely the ability to register "filters" that are called early in
>> input_event() and where a return value !=0 lets it return immediately
>> from
>> input_event() without processing the event.
>> Eg. something along these lines:
>> 	ret = 0;
>>         list_for_each_entry(filter, &dev->f_list, d_node)
>>                 if (filter->open)
>>                         ret |= filter->handler->event(handle, type,
>> code,
>> value);
>> 	if (ret) return;
>> Comments?
> I don't think I want this. This *can* be solved completely in userspace,

It can, but at the expense of 2 context switches per event if you run
a filter program in user space.

-- Till.

> the only problem would be that the interface to the userspace program
> doing it wouldn't be the same as to evdev.c, and that the kernel *dev.c
> modules could not bind to do it.
> For mice, there is no problem - the mouse protocol can be implemented
> over a bidirectional pipe.
> For making another evdev device, you can use uinput.
> You'd only have problems should you want to create a joystick device,
> which you most likely won't need to do.
> --
> Vojtech Pavlik
> SuSE Labs

** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/

More information about the Linuxppc-dev mailing list