linux-kernel - Re: Help with rtc to hpet conversion of OSGPS driver

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Message-id: <470EF602.40404@shaw.ca>
Date:	Thu, 11 Oct 2007 22:20:18 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Rick Niles <fniles@...pooh.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Help with rtc to hpet conversion of OSGPS driver

Rick Niles wrote:
> I'm the Linux maintainer for the OSGPS (open source GPS) project.  Our 
> last release version was based off Fedora 5 and since we have had some 
> hardware issues with our on board interrupt line I was using the RTC 
> interrupt to service the tracking loops.  I've been trying to make the 
> driver work with Fedora 7 and the 2.6.22 kernel, but the rtc_register() 
> and other RTC functions seems to have been removed. I see they've been 
> replaced by the corresponding HPET functions, which is great. However, 
> hpet_register() always returns -16 (EBUSY).  This could be because I 
> lack the correct hardware (I'm running 32-bit Linux on a Athlon64 with 
> an NVIDIA chipset) or some other reason.
> 
> I'm looking for any help here.   The RTC version of the code can be 
> viewed at:
> http://osgps.cvs.sourceforge.net/osgps/osgps/linuxmod.c?revision=1.12&view=markup 
> 
> 
> Can device drivers still use the real-time clock at all?  Does the 
> tickless kernel effect this at all?
> 
> Thanks for any help you can lend,
> Rick Niles.

Am I missing why you can't just use a normal kernel timer for this? You 
shouldn't have to mess with the RTC or HPET directly..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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