[Letux-kernel] new generic battery driver

H. Nikolaus Schaller hns at goldelico.com
Tue Jun 7 17:45:29 CEST 2016


> Am 07.06.2016 um 17:19 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> 
> Hi Marek,
> I have now merged/fixed (the DT patch had to be included in work/hns/dt/gta04)
> and I hope that I did not forget/break anything.
> 
> What I now get is:
> 
> Battery /sys/class/power_supply/generic-adc-batt
> ==================
> type: Battery
> present:
> technology: Li-ion
> capacity: 49%
> status: Discharging
> level:
> volt: 3824uV
> current: -750uA
> temp: 0°C
> charge: 0uAh
> full: uAh
> design: 4000uAh
> energy: J?
> power: W?
> cycles:
> health:
> discharge: s to empty average
> remaining: s to empty
> charging: s to full
> 
> This looks already quite good.
> 
> Volt & capacity look reasonable, but for current I think it must convert between mA (iio) and µA (power_supply).

and volt as well.

> 
> Design should be something like 1200000 uAh (and configured by device tree).
> We can simply make "full" === "design".
> Charge could then be capacity (%) * full uAh.
> 
> So we can even report more useful values.
> 
> One thing I think we should add is a current offset. The reason is that the charging
> current is split between battery and OMAP and only what the OMAP does not draw is
> charging.
> 
> So we need to compensate for this effect. That adds another DT parameter
> for the current-offset-mA. We will set this to ca. 300mA.
> 
> I have still seen "discharging" even if the charger is active. This might also have something
> to do with this issue.
> 
> And the battery resistance should also be a DT parameter (internal-battery-resistance-mOhm).
> 
> I will push the new version to git (overwriting yours) so that you can compare with your local
> branch. If something is missing or to be added, please commit to git version (and let me know
> so that I will pull it before pushing).
> 
> BR,
> Nikolaus
> 
> 
> 
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