linux-kernel - Re: [PATCH v2 2/3] bq2415x_charger: Use power

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: <20131125151838.GD21526@amd.pavel.ucw.cz>
Date:	Mon, 25 Nov 2013 16:18:39 +0100
From:	Pavel Machek <pavel@....cz>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Sebastian Reichel <sre@...g0.de>,
	Anton Vorontsov <anton@...msg.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	freemangordon@....bg, aaro.koskinen@....fi
Subject: Re: [PATCH v2 2/3] bq2415x_charger: Use power_supply notifier for
 automode

On Mon 2013-11-25 15:10:00, Pali Rohár wrote:
> On Monday 25 November 2013 15:01:27 Pavel Machek wrote:
> > Where can I get dsme sources?
> > 									Pavel
> 
> dsme daemon: https://gitorious.org/community-ssu/dsme
> dsme thermal plugin: https://gitorious.org/rx51-bme-replacement/dsme-thermalobject-surface
> 
> dsme thermal plugin is responsible for checking temperature of 
> battery and send it to dsme damon. dsme daemon itself checking 
> temperature limits and do something (e.g reboot device)

Thanks for links!

AFAICT.... dsme daemon does some kind of system management, not
directly controlling charging, right? It does monitor system temperature.

Now.. Imagine phone left in car in charger (on sun). Likely
temperature will reach high values, kernel is charging, dsme will
reboot the system, but kernel will start charging again, dsme will
reboot again, ...

And it is not only high temperatures that are problem for li-ion
charging; battery should not be fast charged below 5C and should not
be charged below 0C. (Again, both are likely to happen if you leave
your phone in car).

AFAICT, we should simply disable charging below 5C or above 45C.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/