[PATCH] sbs-battery: fix power status when battery is dry

[sre@kernel.org (Sebastian Reichel)]

Hi,

On Wed, Mar 30, 2016 at 04:58:30PM +0800, YH Huang wrote:
> If I revise the description in this way(using your clear explanation):
> ------------------------------------------------------------------------
> The battery capacity changing course is like this:
> 
> full: BATTERY_FULLY_CHARGED => POWER_SUPPLY_STATUS_FULL
> <unplug AC>
> high->low: BATTERY_DISCHARGING => POWER_SUPPLY_STATUS_DISCHARGING
> ~0%: DISCHARGING & FULLY_DISCHARGED => POWER_SUPPLY_STATUS_NOT_CHARGING
> <plug in AC>
> 0%~20%: FULLY_DISCHARGED => POWER_SUPPLY_STATUS_CHARGING
> 20%~: No flag => POWER_SUPPLY_STATUS_CHARGING
> 
> For now, it is not exactly right to show the status as
> POWER_SUPPLY_STATUS_NOT_CHARGING when the battery is dry
> (FULLY_DISCHARGED) and AC is plugged in.
> Although the battery is in a low level, system works fine with the AC
> charging.
> It is better to say that the battery is charging.
> ------------------------------------------------------------------------
> 
> How about this?
> By the way, should I also revise the title?

POWER_SUPPLY_STATUS_NOT_CHARGING is used for AC connected, but
battery not charging (e.g. because battery temperature is out
of acceptable range). If you are discharging use
POWER_SUPPLY_STATUS_DISCHARGING.

You should just ignore the FULLY_DISCHARGED bit in the status
property. If you don't want to loose the information about fully
discharged battery add POWER_SUPPLY_PROP_CAPACITY_LEVEL, which maps:

BATTERY_FULLY_CHARGED => POWER_SUPPLY_CAPACITY_LEVEL_FULL
FULLY_DISCHARGED => POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL
otherwise => POWER_SUPPLY_CAPACITY_LEVEL_NORMAL

-- Sebastian
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