linux-kernel - Re: [PATCH v4 2/4] power_supply: Add additional health properties to the header

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Date:   Fri, 6 Mar 2020 15:55:48 -0800
From:   Sandeep Patil <sspatil@...roid.com>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Dan Murphy <dmurphy@...com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH v4 2/4] power_supply: Add additional health properties to
 the header

Hi Sebastian,

On Fri, Jan 17, 2020 at 02:06:58AM +0100, Sebastian Reichel wrote:
> Hi,
> 
> On Thu, Jan 16, 2020 at 11:50:37AM -0600, Dan Murphy wrote:
> > Add HEALTH_WARM, HEALTH_COOL and HEALTH_HOT to the health enum.
> > 
> > Signed-off-by: Dan Murphy <dmurphy@...com>
> > ---
> 
> Looks good. But I will not merge it without a user and have comments
> for the driver.

Android has been looking for these properties for a while now [1].
It was added[2] when we saw that the manufacturers were implementing these
properties in the driver. I didn't know the properties were absent upstream
until yesterday. Somebody pointed out in our ongoing effort to make sure
all core kernel changes that android depends on are present upstream.

I think those values are also propagated in application facing APIs in
Android (but I am not sure yet, let me know if that's something you want
to find out).

I wanted to chime in and present you a 'user' for this if that helps.

Cc: kernel-team@...roid.com

- ssp

1. https://android.googlesource.com/platform/system/core/+/refs/heads/master/healthd/BatteryMonitor.cpp#162
2. https://android-review.googlesource.com/c/platform/system/core/+/414481

> 
> -- Sebastian
> 
> >  Documentation/ABI/testing/sysfs-class-power | 2 +-
> >  drivers/power/supply/power_supply_sysfs.c   | 2 +-
> >  include/linux/power_supply.h                | 3 +++
> >  3 files changed, 5 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
> > index bf3b48f022dc..9f3fd01a9373 100644
> > --- a/Documentation/ABI/testing/sysfs-class-power
> > +++ b/Documentation/ABI/testing/sysfs-class-power
> > @@ -190,7 +190,7 @@ Description:
> >  		Valid values: "Unknown", "Good", "Overheat", "Dead",
> >  			      "Over voltage", "Unspecified failure", "Cold",
> >  			      "Watchdog timer expire", "Safety timer expire",
> > -			      "Over current"
> > +			      "Over current", "Warm", "Cool", "Hot"
> >  
> >  What:		/sys/class/power_supply/<supply_name>/precharge_current
> >  Date:		June 2017
> > diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
> > index f37ad4eae60b..d0d549611794 100644
> > --- a/drivers/power/supply/power_supply_sysfs.c
> > +++ b/drivers/power/supply/power_supply_sysfs.c
> > @@ -61,7 +61,7 @@ static const char * const power_supply_charge_type_text[] = {
> >  static const char * const power_supply_health_text[] = {
> >  	"Unknown", "Good", "Overheat", "Dead", "Over voltage",
> >  	"Unspecified failure", "Cold", "Watchdog timer expire",
> > -	"Safety timer expire", "Over current"
> > +	"Safety timer expire", "Over current", "Warm", "Cool", "Hot"
> >  };
> >  
> >  static const char * const power_supply_technology_text[] = {
> > diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
> > index 28413f737e7d..bd0d3225f245 100644
> > --- a/include/linux/power_supply.h
> > +++ b/include/linux/power_supply.h
> > @@ -61,6 +61,9 @@ enum {
> >  	POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE,
> >  	POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE,
> >  	POWER_SUPPLY_HEALTH_OVERCURRENT,
> > +	POWER_SUPPLY_HEALTH_WARM,
> > +	POWER_SUPPLY_HEALTH_COOL,
> > +	POWER_SUPPLY_HEALTH_HOT,
> >  };
> >  
> >  enum {
> > -- 
> > 2.25.0
> >