linux-kernel - [patch 2.6.18-rc1-git] rtc-acpi, with wakeup support

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Date:	Sat, 15 Jul 2006 12:40:51 -0700
From:	David Brownell <david-b@...bell.net>
To:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: [patch 2.6.18-rc1-git] rtc-acpi, with wakeup support

The new RTC framework hasn't been very usable on most x86 desktop
PCs ... so here's a driver using the ACPI RTC and PNPACPI.  AFAICT
it could mostly replace drivers/char/rtc.c on ACPI systems.

One of the goals here was to expose this RTC as a normal wakeup
event source ... no /proc/acpi/alarm thing, just the same userspace
interfaces as on non-ACPI RTCs, and non-RTC devices.  That works
somewhat ... for the very first time, I've seen ACPI wakeup behave!

But ACPI doesn't always behave after hardware wakeup events, so

	echo disabled > /sys/class/rtc/rtc0/device/power/wakeup

may be appropriate on the systems where it doesn't yet work.

- Dave

p.s. A followup message will include a userspace program which
     makes it easier to try the RTC wakeup mechanism.

View attachment "rtc.patch" of type "text/x-diff" (18775 bytes)