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authorRalf Baechle <ralf@linux-mips.org>2007-02-09 17:08:57 +0000
committerRalf Baechle <ralf@linux-mips.org>2007-02-09 17:08:57 +0000
commit7726942fb15edd46e4fe8ab37f9a99795191e585 (patch)
tree08ce9b114d76f4247b353658bac43b8117609c0f /kernel
parent5986a2ec35836a878350c54af4bd91b1de6abc59 (diff)
[APM] Add shared version of APM emulation
Currently ARM and MIPS both have nearly identical copies of the APM emulation code in their arch code. Add yet another copy of it to drivers char and make it selectable through SYS_SUPPORTS_APM_EMULATION. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/power/Kconfig26
1 files changed, 26 insertions, 0 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index ed296225dcd..95f6657fff7 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -131,3 +131,29 @@ config SUSPEND_SMP
bool
depends on HOTPLUG_CPU && X86 && PM
default y
+
+config APM_EMULATION
+ tristate "Advanced Power Management Emulation"
+ depends on PM && SYS_SUPPORTS_APM_EMULATION
+ help
+ APM is a BIOS specification for saving power using several different
+ techniques. This is mostly useful for battery powered laptops with
+ APM compliant BIOSes. If you say Y here, the system time will be
+ reset after a RESUME operation, the /proc/apm device will provide
+ battery status information, and user-space programs will receive
+ notification of APM "events" (e.g. battery status change).
+
+ In order to use APM, you will need supporting software. For location
+ and more information, read <file:Documentation/pm.txt> and the
+ Battery Powered Linux mini-HOWTO, available from
+ <http://www.tldp.org/docs.html#howto>.
+
+ This driver does not spin down disk drives (see the hdparm(8)
+ manpage ("man 8 hdparm") for that), and it doesn't turn off
+ VESA-compliant "green" monitors.
+
+ Generally, if you don't have a battery in your machine, there isn't
+ much point in using this driver and you should say N. If you get
+ random kernel OOPSes or reboots that don't seem to be related to
+ anything, try disabling/enabling this option (or disabling/enabling
+ APM in your BIOS).