linux-kernel - Re: [RFC PATCH 3/5] power/generic-adc-battery: Add support for temperature and add check for charge from iio current channel

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Date:   Tue, 29 Aug 2017 11:54:55 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Marek Belisko <marek.belisko@...n-nandra.com>
Cc:     robh+dt@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, hns@...delico.com, pavel@....cz,
        Marek Belisko <marek.belisko@...il.com>
Subject: Re: [RFC PATCH 3/5] power/generic-adc-battery: Add support for
 temperature and add check for charge from iio current channel

Hi,

On Tue, Aug 01, 2017 at 10:55:24PM +0200, Marek Belisko wrote:
> From: Marek Belisko <marek.belisko@...il.com>
> 
> Status reporting not working yet. During boot when workqueue is called status
> is updated (by reading iio current channel but value is -705 (reason unknown as later
> report correct value).
> 
> Signed-off-by: Marek Belisko <marek.belisko@...il.com>
> ---
>  drivers/power/supply/generic-adc-battery.c | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/power/supply/generic-adc-battery.c b/drivers/power/supply/generic-adc-battery.c
> index d4daa6a..0d27b59 100644
> --- a/drivers/power/supply/generic-adc-battery.c
> +++ b/drivers/power/supply/generic-adc-battery.c
> @@ -31,6 +31,7 @@ enum gab_chan_type {
>  	GAB_VOLTAGE = 0,
>  	GAB_CURRENT,
>  	GAB_POWER,
> +	GAB_TEMPERATURE,
>  	GAB_MAX_CHAN_TYPE
>  };
>  
> @@ -41,7 +42,8 @@ enum gab_chan_type {
>  static const char *const gab_chan_name[] = {
>  	[GAB_VOLTAGE]	= "voltage",
>  	[GAB_CURRENT]	= "current",
> -	[GAB_POWER]		= "power",
> +	[GAB_POWER]	= "power",
> +	[GAB_TEMPERATURE] = "temperature",
>  };
>  
>  struct gab {
> @@ -78,6 +80,7 @@ static const enum power_supply_property gab_props[] = {
>  	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
>  	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
>  	POWER_SUPPLY_PROP_MODEL_NAME,
> +	POWER_SUPPLY_PROP_TEMP,
>  };
>  
>  /*
> @@ -123,6 +126,8 @@ static enum gab_chan_type gab_prop_to_chan(enum power_supply_property psp)
>  		return GAB_VOLTAGE;
>  	case POWER_SUPPLY_PROP_CURRENT_NOW:
>  		return GAB_CURRENT;
> +	case POWER_SUPPLY_PROP_TEMP:
> +		return GAB_TEMPERATURE;
>  	default:
>  		WARN_ON(1);
>  		break;
> @@ -176,6 +181,7 @@ static int gab_get_property(struct power_supply *psy,
>  	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
>  	case POWER_SUPPLY_PROP_CURRENT_NOW:
>  	case POWER_SUPPLY_PROP_POWER_NOW:
> +	case POWER_SUPPLY_PROP_TEMP:
>  		ret = read_channel(adc_bat, psp, &result);
>  		if (ret < 0)
>  			goto err;
> @@ -210,13 +216,19 @@ static void gab_work(struct work_struct *work)
>  	struct delayed_work *delayed_work;
>  	bool is_plugged;
>  	int status;
> +	int ret, iio_charge;
>  
>  	delayed_work = to_delayed_work(work);
>  	adc_bat = container_of(delayed_work, struct gab, bat_work);
>  	pdata = adc_bat->pdata;
>  	status = adc_bat->status;
> -
> -	is_plugged = power_supply_am_i_supplied(adc_bat->psy);
> +	ret = read_channel(adc_bat, POWER_SUPPLY_PROP_CURRENT_NOW, &iio_charge);
> +	if (ret < 0) {
> +		pr_info("Cannot read current channel, ret:%d\n", ret);
> +		iio_charge = 0;
> +	} else
> +		pr_info("iio_charge:%d\n", iio_charge);
> +	is_plugged = power_supply_am_i_supplied(adc_bat->psy) || (iio_charge > 0);

This has nothing to do with adding temperature support and
I suspect, that you are missing proper supplied_by configuration,
so that power_supply_am_i_supplied does not work. Have a look at
the following file:

Documentation/devicetree/bindings/power/supply/power_supply.txt

-- Sebastian

>  	adc_bat->cable_plugged = is_plugged;
>  
>  	if (!is_plugged)
> -- 
> 2.7.4
> 

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