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

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Message-Id: <201311251952.23194@pali>
Date:	Mon, 25 Nov 2013 19:52:22 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Pavel Machek <pavel@....cz>
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 Monday 25 November 2013 16:18:39 Pavel Machek wrote:
> 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-thermalobje
> > ct-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.
> 

Yes.

> 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

Similar patch (as this) can be added to check for temperature 
from specified power supply driver (in timer reset thread). This 
can be easy and will fix this problem.

-- 
Pali Rohár
pali.rohar@...il.com

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