linux-kernel - Re: [RFC] shutdown machine when li-ion battery goes below 3V

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20161024214152.GA32310@amd>
Date:   Mon, 24 Oct 2016 23:41:52 +0200
From:   Pavel Machek <pavel@....cz>
To:     Tony Lindgren <tony@...mide.com>
Cc:     pali.rohar@...il.com, sre@...nel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com
Subject: Re: [RFC] shutdown machine when li-ion battery goes below 3V

On Mon 2016-10-24 14:29:33, Tony Lindgren wrote:
> * Pavel Machek <pavel@....cz> [161024 14:24]:
> > Hi!
> > 
> > What about something like this? N900 will drain the battery down to
> > system crash, which is quite uncool.
> 
> Can't we make that generic and configurable for the voltage somehow?

I was afraid someone would ask :-).

Yes, we probably need to create battery object in the device tree,
then add properties there.

> Also, the shutdown voltage can depend on external devices connected.
> It could be for example 3.3V depending on eMMC on some devices while
> devices with no eMMC could have it at 3.0V.

Actually, I'd like to shutdown at 3.3V or more (like 3.5V), because
going below that is pretty mean to the battery. But if I set threshold
too high, GSM activity will push it below that for a very short while,
and I'll shutdown too soon.

Ideas welcome...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Download attachment "signature.asc" of type "application/pgp-signature" (182 bytes)