[Gta04-owner] Upstream Replicant 4.2 support for GTA04

Lukas Maerdian luk at slyon.de
Fri Mar 7 21:20:22 CET 2014

2014-03-07 20:41 GMT+01:00 Paul Kocialkowski <contact at paulk.fr>:
> Le jeudi 06 mars 2014 à 13:56 +0100, Lukas Maerdian a écrit :
>> 2014-03-06 13:36 GMT+01:00 Christoph Mair <christoph.mair at gmail.com>:
>> > On Thu, Mar 6, 2014 at 1:27 PM, Lukas Maerdian <luk at slyon.de> wrote:
>> >> 2014-03-06 13:14 GMT+01:00 Dr. H. Nikolaus Schaller <hns at goldelico.com>:
>> >>> Looks as if either
>> >>> * bq27000 chip in old battery is broken so that it does not respond to hdq requests
>> >>> * HDQ contact pad (CC) of old battery could be corroded
>> >>
>> >> Yes, the pad looks a bit used, see attachment:
>> >> The top battery is the old one and its middle pad (this is the HDQ,
>> >> right?) is sort of greenish.
>> >
>> > Try to scratch on the surface of the pad. Maybe you can remove some of
>> > this green coating.
>> Thanks Christoph, it worked!
>> Now Android shows the battery status with the old battery as well again.
>> So, PaulK should check his battery pads, before modifying the
>> bq27x00-battery driver.
> Okay, I'll do that. However, I recall the driver was working fine with
> the old 4.0 build I had installed on the sdcard before flashing the new
> 4.2 images. I'll let you know. I also have a newer openmoko battery as
> well as a Nokia one. By the way, how does one go about using a Nokia
> compatible battery on the gta04?

AFAIK the Nokia batteries don't have the HDQ, so they can't measure
their status themselfs, which means we have to approximate their
status in a driver. Your best bet would probably be to use the
twl4030-madc-battery driver, as used by the Letux 3704/7004 device
variants. It uses the voltage values measured by the TWL4030, to
approximate the battery capacity (in %). The capacity approximation is
a little bit rough currently, it could be improved by better
charge/discharge callibration data (volt <-> capacity mapping).

That driver was created by us and is in mainline since Linux 3.11, is
used (at least) in our Letux devices without HDQ and in some Nokia


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