linux-kernel - Re: [PATCH RFC v3 2/9] power: supply: core: register thermal zone for battery

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Message-ID: <ibihc343f3fcuk5c6gtz7kwhtf6e7pbtwkbx4wxu2wbmk4amfy@qorjk4mrbq44>
Date: Sat, 14 Sep 2024 11:29:04 +0200
From: Sebastian Reichel <sebastian.reichel@...labora.com>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Armin Wolf <W_Armin@....de>, Hans de Goede <hdegoede@...hat.com>, 
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v3 2/9] power: supply: core: register thermal zone
 for battery

Hi,

On Wed, Sep 04, 2024 at 09:25:35PM GMT, Thomas Weißschuh wrote:
> power_supply_read_team() can also read the temperature from the battery.
power_supply_read_temp()

> But currently when registering the thermal zone, the battery is
> not checked for POWER_SUPPLY_PROP_TEMP. Introduce a helper which
> can check both the desc and the battery info for property
> existence and use that. Export the helper to the rest of the psy
> core because it will also be used by different subcomponents.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---

power_supply_battery_info contains constant battery information like
design capacity or maximum voltage, which is e.g. supplied by the
firmware and needed by fuel-gauges or chargers. The temperature is
not constant and cannot be part of power_supply_battery_info, so
this does not really make sense.

Greetings,

-- Sebastian

>  drivers/power/supply/power_supply.h      |  3 +++
>  drivers/power/supply/power_supply_core.c | 14 +++++++++++++-
>  2 files changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/power_supply.h b/drivers/power/supply/power_supply.h
> index 3cbafc58bdad..b01faeaf7827 100644
> --- a/drivers/power/supply/power_supply.h
> +++ b/drivers/power/supply/power_supply.h
> @@ -13,6 +13,9 @@ struct device;
>  struct device_type;
>  struct power_supply;
>  
> +extern bool power_supply_has_property(struct power_supply *psy,
> +				      enum power_supply_property psp);
> +
>  #ifdef CONFIG_SYSFS
>  
>  extern void power_supply_init_attrs(void);
> diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
> index cff68c4fd63c..dcb7e4853030 100644
> --- a/drivers/power/supply/power_supply_core.c
> +++ b/drivers/power/supply/power_supply_core.c
> @@ -1199,6 +1199,18 @@ static bool psy_desc_has_property(const struct power_supply_desc *psy_desc,
>  	return found;
>  }
>  
> +bool power_supply_has_property(struct power_supply *psy,
> +			       enum power_supply_property psp)
> +{
> +	if (psy_desc_has_property(psy->desc, psp))
> +		return true;
> +
> +	if (power_supply_battery_info_has_prop(psy->battery_info, psp))
> +		return true;
> +
> +	return false;
> +}
> +
>  int power_supply_get_property(struct power_supply *psy,
>  			    enum power_supply_property psp,
>  			    union power_supply_propval *val)
> @@ -1308,7 +1320,7 @@ static int psy_register_thermal(struct power_supply *psy)
>  		return 0;
>  
>  	/* Register battery zone device psy reports temperature */
> -	if (psy_desc_has_property(psy->desc, POWER_SUPPLY_PROP_TEMP)) {
> +	if (power_supply_has_property(psy, POWER_SUPPLY_PROP_TEMP)) {
>  		/* Prefer our hwmon device and avoid duplicates */
>  		struct thermal_zone_params tzp = {
>  			.no_hwmon = IS_ENABLED(CONFIG_POWER_SUPPLY_HWMON)
> 
> -- 
> 2.46.0
> 
> 

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