linux-kernel - Re: [PATCH 09/15] power: supply: bq24190_charger: Add voltage_max

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Message-ID: <20170320051225.d4fsffx3updncdqd@earth>
Date:   Mon, 20 Mar 2017 06:12:25 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Wolfram Sang <wsa@...-dreams.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Lee Jones <lee.jones@...aro.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-acpi@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH 09/15] power: supply: bq24190_charger: Add
 voltage_max_design prop to battery

Hi,

On Fri, Mar 17, 2017 at 10:55:21AM +0100, Hans de Goede wrote:
> When combined with an external fuel-gauge, upower needs voltage_max_design
> as it internally does all its calculations in Watts and converts the
> charge_foo properties from A to Watts by using voltage_max_design.
> 
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>

Assuming, that my comment on patch 14 works POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN
is required in the fuel-gauge driver instead. As far as I understand
it the charger voltage was too high for your device anyways, so that
you capped it at 4.3V. So I assume, that you can just provide it via
device properties.

-- Sebastian

>  drivers/power/supply/bq24190_charger.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/bq24190_charger.c b/drivers/power/supply/bq24190_charger.c
> index 9fe69a5..82cb33d 100644
> --- a/drivers/power/supply/bq24190_charger.c
> +++ b/drivers/power/supply/bq24190_charger.c
> @@ -1103,6 +1103,13 @@ static int bq24190_battery_get_property(struct power_supply *psy,
>  		val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
>  		ret = 0;
>  		break;
> +	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
> +		/*
> +		 * Report charger configured voltage as max design voltage,
> +		 * not entirely correct, but userspace needs something here.
> +		 */
> +		ret = bq24190_charger_get_voltage(bdi, val);
> +		break;
>  	case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
>  		ret = bq24190_battery_get_temp_alert_max(bdi, val);
>  		break;
> @@ -1169,6 +1176,7 @@ static enum power_supply_property bq24190_battery_properties[] = {
>  	POWER_SUPPLY_PROP_HEALTH,
>  	POWER_SUPPLY_PROP_ONLINE,
>  	POWER_SUPPLY_PROP_TECHNOLOGY,
> +	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
>  	POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
>  	POWER_SUPPLY_PROP_SCOPE,
>  	/* Begin of extended battery properties */
> @@ -1186,7 +1194,7 @@ static const struct power_supply_desc bq24190_battery_desc = {
>  	.name			= "bq24190-battery",
>  	.type			= POWER_SUPPLY_TYPE_BATTERY,
>  	.properties		= bq24190_battery_properties,
> -	.num_properties		= 6,
> +	.num_properties		= 7,
>  	.get_property		= bq24190_battery_get_property,
>  	.set_property		= bq24190_battery_set_property,
>  	.property_is_writeable	= bq24190_battery_property_is_writeable,
> -- 
> 2.9.3
> 

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