Date: Mon, 12 May 2014 07:41:22 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Maxim Ignatenko <gelraen.ua@gmail.com>, freebsd-hackers@freebsd.org Subject: Re: Keyboard drivers, polling vs. non-polling mode Message-ID: <53705F02.4040507@selasky.org> In-Reply-To: <CABWTX-YViLKRS62cuWcJh=Ma_n3TjU2EEaAcijBzSFXGqiuMDQ@mail.gmail.com> References: <CABWTX-YViLKRS62cuWcJh=Ma_n3TjU2EEaAcijBzSFXGqiuMDQ@mail.gmail.com>
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On 05/12/14 00:33, Maxim Ignatenko wrote: > Hello, > > I'm trying trying to get keyboard working in DDB on HP Chromebook 11 (ARM). > br@ said that it doesn't work there because polling mode is not implemented yet. > Where can I read about the difference between polling and non-polling > modes (and about keyboard drivers in general)? > sys/dev/kbd/kbdreg.h describes some structures and method signatures, > but I have no clue what is the expected behaviour of those methods. > > My current guess is that in polling mode keyboard driver just queues > up all the input coming from keyboard and then gives it to consumer > upon request, while in non-polling mode it invokes some callback > instead of queueing. But I cannot find any documentation to confirm or > disprove that. > Hi, Maybe you get some clues from looking at /sys/dev/usb/input/ukbd.c regarding polling mode. --HPS
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