linux-kernel - Re: [PATCH v4 7/8] power: supply: rt5033_battery: Adopt status property from charger

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Date:   Mon, 8 May 2023 23:18:28 +0200
From:   Jakob Hauser <jahau@...ketmail.com>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Lee Jones <lee@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Beomho Seo <beomho.seo@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Raymond Hackley <raymondhackley@...tonmail.com>,
        Pavel Machek <pavel@....cz>, Axel Lin <axel.lin@...ics.com>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Henrik Grimler <henrik@...mler.se>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v4 7/8] power: supply: rt5033_battery: Adopt status
 property from charger

Hi Sebastian,

On 08.05.23 13:35, Sebastian Reichel wrote:
> Hi,
> 
> On Sat, May 06, 2023 at 05:54:34PM +0200, Jakob Hauser wrote:
>> The rt5033-battery fuelgauge can't get a status by itself. The rt5033-charger
>> can, let's get this value.
>>
>> Tested-by: Raymond Hackley <raymondhackley@...tonmail.com>
>> Signed-off-by: Jakob Hauser <jahau@...ketmail.com>
>> ---
>>   drivers/power/supply/rt5033_battery.c | 24 ++++++++++++++++++++++++
>>   1 file changed, 24 insertions(+)
>>
>> diff --git a/drivers/power/supply/rt5033_battery.c b/drivers/power/supply/rt5033_battery.c
>> index 5c04cf305219..a6520716d813 100644
>> --- a/drivers/power/supply/rt5033_battery.c
>> +++ b/drivers/power/supply/rt5033_battery.c
>> @@ -12,6 +12,26 @@
>>   #include <linux/mfd/rt5033-private.h>
>>   #include <linux/mfd/rt5033.h>
>>   
>> +static int rt5033_battery_get_status(struct i2c_client *client)
>> +{
>> +	struct power_supply *charger;
>> +	union power_supply_propval val;
>> +	int ret;
>> +
>> +	charger = power_supply_get_by_name("rt5033-charger");
>> +	if (!charger)
>> +		return POWER_SUPPLY_STATUS_UNKNOWN;
>> +
>> +	ret = power_supply_get_property(charger, POWER_SUPPLY_PROP_STATUS, &val);
>> +	if (ret) {
>> +		power_supply_put(charger);
>> +		return POWER_SUPPLY_STATUS_UNKNOWN;
>> +	}
> 
> struct rt5033_battery *battery = i2c_get_clientdata(client);
> ret = power_supply_get_property_from_supplier(battery->psy, POWER_SUPPLY_PROP_STATUS, &val);
> if (ret)
>      val.intval = POWER_SUPPLY_STATUS_UNKNOWN;

I don't think this works. There is no direct relationship between 
rt5033-charger and rt5033-battery. They operate independently from each 
other.

I had a short try and the status property of rt5033-battery was "unknown".

Just for the record, the full function I tried was:

static int rt5033_battery_get_status(struct i2c_client *client)
{
         struct rt5033_battery *battery = i2c_get_clientdata(client);
         union power_supply_propval val;
         int ret;

         ret = power_supply_get_property_from_supplier(battery->psy,
                                              POWER_SUPPLY_PROP_STATUS,
                                              &val);
         if (ret)
                 val.intval = POWER_SUPPLY_STATUS_UNKNOWN;

         return val.intval;
}

Later on I added a read-out of the "ret" value. It is "-19". I guess 
that's the "return -ENODEV;" from function 
power_supply_get_property_from_supplier(). [2]

[2] 
https://github.com/torvalds/linux/blob/v6.4-rc1/drivers/power/supply/power_supply_core.c#L397-L421

>> +
>> +	power_supply_put(charger);
>> +	return val.intval;
>> +}
>> +
>>   static int rt5033_battery_get_capacity(struct i2c_client *client)
>>   {
>>   	struct rt5033_battery *battery = i2c_get_clientdata(client);
>> @@ -84,6 +104,9 @@ static int rt5033_battery_get_property(struct power_supply *psy,
>>   	case POWER_SUPPLY_PROP_CAPACITY:
>>   		val->intval = rt5033_battery_get_capacity(battery->client);
>>   		break;
>> +	case POWER_SUPPLY_PROP_STATUS:
>> +		val->intval = rt5033_battery_get_status(battery->client);
>> +		break;
>>   	default:
>>   		return -EINVAL;
>>   	}
>> @@ -96,6 +119,7 @@ static enum power_supply_property rt5033_battery_props[] = {
>>   	POWER_SUPPLY_PROP_VOLTAGE_OCV,
>>   	POWER_SUPPLY_PROP_PRESENT,
>>   	POWER_SUPPLY_PROP_CAPACITY,
>> +	POWER_SUPPLY_PROP_STATUS,
>>   };
>>   
>>   static const struct regmap_config rt5033_battery_regmap_config = {
>> -- 
>> 2.39.2
>>
> 
> Otherwise LGTM.
> 
> -- Sebastian

Kind regards,
Jakob