linux-kernel - Re: Battery charging, battery status on Nokia N9, N950

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Message-ID: <20171107201651.GB2572@amd>
Date:   Tue, 7 Nov 2017 21:16:51 +0100
From:   Pavel Machek <pavel@....cz>
To:     Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
Cc:     Pali Rohár <pali.rohar@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
        Tony Lindgren <tony@...mide.com>, khilman@...nel.org,
        aaro.koskinen@....fi,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
        clayton@...ftyguy.net, martijn@...xit.nl,
        sakari.ailus@...ux.intel.com
Subject: Re: Battery charging, battery status on Nokia N9, N950

On Tue 2017-11-07 21:04:19, Michael Nazzareno Trimarchi wrote:
> Hi Pavel
> 
> On Tue, Nov 7, 2017 at 8:59 PM, Pavel Machek <pavel@....cz> wrote:
> > Hi!
> >
> >>
> >> > I'm fighting with battery status & battery charging on Nokia
> >> > N9/N950. https://elinux.org/N950 contains enough info to get battery
> >> > status (and below is first attempt at kernel implementation), but I'm
> >> > not sure what needs to be done to charge the battery (or at least
> >> > power phone from USB).
> >>
> >> Nemo recovery system (2824336 Jul 25  2016 zImage-moslo) seems to
> >> either charge phone from USB or at power it from USB.
> >>
> >> But 4.13 does not; it seems there are two separate issue.
> >>
> >> First, something needs to be done to enable system power from the
> >> USB. I'm not sure what that one would be :-(. Then, it should be
> >> possible to ask bq24153 to charge the battery.
> >
> > If someone has schematics or pointer to them.. for N9 or N950, that
> > would be useful :-).
> >
> 
> You can dump pinctrl and configuration and check if some gpio are
> used.  From reference schematic of this charger you have OTG and
> CD. Those pins can be just used to enable/disable and boost charging.
> You should dig a bit in sysfs to figure it out ;)

I tried to search old board file from working version -- seemed better
than randomly toggling stuff in /sys. But I could not find anything
suspicious.

If someone has the schematics, that would be useful.

Best regards,
									Pavel

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

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