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Re: Battery status

To: Rodolfo Giometti <>
Subject: Re: Battery status
From: Clark Williams <>
Date: Fri, 22 Jul 2005 10:25:24 -0500
In-reply-to: <>
Original-recipient: rfc822;
References: <> <1122044036.10743.5.camel@riff> <>
On Fri, 2005-07-22 at 17:14 +0200, Rodolfo Giometti wrote:
> On Fri, Jul 22, 2005 at 09:53:56AM -0500, Clark Williams wrote:
> > You might want to look at how acpi is presented in the /proc interface.
> > You could hook your battery status routines into the acpi entries:
> > 
> >     /proc/acpi/battery/BAT0/{alarm,info,status} 
> I see... but in «drivers/acpi/Kconfig» I notice that this driver
> depends on «IA64 || X86». Do you think I can activate it even for MIPS
> arch? :-o

/me goes and actually *looks* at the acpi driver(s)

I would recommend writing a completely separate driver that just
provides the hook(s) to get to battery and any other info you want to
provide. I did it on another platform (can't seem to find that code
though) mainly to use the /proc/acpi/event interface and receive button
presses and things like that. Something like a fake-acpi.c that various
platform folks could use to translate their events into the acpi

That's kinda hokey now that I actually wrote it down and looked at it.
Maybe what we need to do is put together a framework somewhat like the
way acpi presents state information, but not called acpi (wouldn't want
someone thinking that we'd ported the acpi interpreter to MIPS :). I'm
not even sure if it should go into /proc or /sys. 

I just liked the fact that the event interface and the status interfaces
were presented in somewhat logical fashion to user space, such that a
shell script could be used to gather information or manipulate the state
(e.g. 'echo 3 >/proc/acpi/sleep' to suspend to RAM). 

Gah. Sorry, you were asking for an answer and I turned this into a
design discussion. My opinion: if you're in a hurry, write a simple
driver that presents a /proc interface to get to battery information. 


Clark Williams <>

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