On Tuesday 06 December 2011 00:35:41 Felipe Contreras wrote: > From: Aliaksei Katovich <aliaksei.katovich@xxxxxxxxx> > > Hi, > > The Nokia N900 has a bunch of stuff regarding the battery: bq27x00 to find > out the status, and isp1704 to detect what kind of charger is connected to > the USB port. However, that doesn't charge the battery. > > That's the job of bq24150. Up until now, this has been done by the closed > and proprietary BME application from user-space, which sends i2c commands > directly. > > Several people have tried to decipher what it's actually doing, and there > are some simple user-space scripts that manage to achieve charging: > > http://enivax.net/jk/n900/charge21.sh.txt > > Aliaksei Katovich already sent a patch series, but they seem to be doing > something completely different (wrong?). > > This simple driver does the work for me. It's doing basically the same as > the user-space scripts, but a bit more aligned to the spec sheet[1], and a > bit more understadable. It's a proof of concept, as it doesn't really > change the voltage or amperage depending on the type of charger as it > should, but it at least it achieves charging. > > I have never writen a driver, so don't hold on the comments :) > > Some inspiration from the code of Aliaksei Katovich. > > Cheers. > > [1] http://www.ti.com/lit/ds/symlink/bq24150.pdf > Hello, I started writing other implementaion of bq2415x charger driver, which should support also setting usb host mode. Code is still unfinished, but now is devided into 2 parts: one power_supply driver and one driver which cover all bq registers. See: http://atrey.karlin.mff.cuni.cz/~pali/bq2415x/ Felipe Contreras, I think that my implementation is better - it will export all bq registers (which is needed for hostmode boost) and will also register regulator interface. -- Pali Rohár pali.rohar@xxxxxxxxx
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