Re: [android-kernel] Getting battery current read

[Durgadoss Ramanathan]

Hi,

Yes, looks like it is almost impossible to measure without external h/w.

Meanwhile, you can have a look at the sysfs interfaces in your device:
cd /sys/class/power_supply/*_battery/
grep . *
[it is grep space dot space star]
This will give you a list of attributes the kernel driver (for whatever chip it is) supports.

Thanks,
Durga

On Sun, Oct 28, 2012 at 5:45 PM, Rodrigo Terra <rodrig...@gmail.com> wrote:

Hi everybody,

   I'm newbie in this list and I'll be really thankfull for some help to double check a point. I'm current developing an experiment to evaluate impacting Android energy consumption changing kernel scheduler. My choice of model to conduct the experiment was google flagship Galaxy Nexus, and unfortunatelly seems to be proving be a silly choice. Although Galaxy Nexus use a Texas TWL6030 that has all that I need to precise measure current using him as gas gauge, it isn't implemented in kernel, and worse than that current sense resistor seems to be not solder in Samsung tuna board. Galaxy Nexus rely on Max17040 to calc battery remain life, but max17040 use only voltage measure, then my questions is:

• Is it really true that I can't get a reliable instantaneous read for battery current in Galaxy Nexus, using TWL6030 or any other method, besides external hardware measure ?

Thanks in advance for the confirmation,

Best Regards Rodrigo

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Durgadoss