linux-kernel - Re: [PATCH v3 08/11] power: supply: core: hide unused HWMON labels

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Date:   Fri, 1 May 2020 15:22:29 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 08/11] power: supply: core: hide unused HWMON labels

Hi,

On Fri, Apr 03, 2020 at 10:20:34PM +0200, Michał Mirosław wrote:
> Currently HWMON emulation shows all labels (temp and ambient temp)
> regardless if power supply supports reading the values. Check that at
> least one property is enabled for each label.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---

Thanks, queued.

-- Sebastian

> v3: use a tabule for type checking instead of switch() sequence
> ---
>  drivers/power/supply/power_supply_hwmon.c | 42 +++++++++++++++++++++--
>  1 file changed, 39 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/power/supply/power_supply_hwmon.c b/drivers/power/supply/power_supply_hwmon.c
> index 5621e72a39f0..1b473deaf391 100644
> --- a/drivers/power/supply/power_supply_hwmon.c
> +++ b/drivers/power/supply/power_supply_hwmon.c
> @@ -103,6 +103,39 @@ static bool power_supply_hwmon_is_a_label(enum hwmon_sensor_types type,
>  	return type == hwmon_temp && attr == hwmon_temp_label;
>  }
>  
> +struct hwmon_type_attr_list {
> +	const u32 *attrs;
> +	size_t n_attrs;
> +};
> +
> +static const u32 ps_temp_attrs[] = {
> +	hwmon_temp_input,
> +	hwmon_temp_min, hwmon_temp_max,
> +	hwmon_temp_min_alarm, hwmon_temp_max_alarm,
> +};
> +
> +static const struct hwmon_type_attr_list ps_type_attrs[hwmon_max] = {
> +	[hwmon_temp] = { ps_temp_attrs, ARRAY_SIZE(ps_temp_attrs) },
> +};
> +
> +static bool power_supply_hwmon_has_input(
> +	const struct power_supply_hwmon *psyhw,
> +	enum hwmon_sensor_types type, int channel)
> +{
> +	const struct hwmon_type_attr_list *attr_list = &ps_type_attrs[type];
> +	size_t i;
> +
> +	for (i = 0; i < attr_list->n_attrs; ++i) {
> +		int prop = power_supply_hwmon_to_property(type,
> +			attr_list->attrs[i], channel);
> +
> +		if (prop >= 0 && test_bit(prop, psyhw->props))
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
>  static bool power_supply_hwmon_is_writable(enum hwmon_sensor_types type,
>  					   u32 attr)
>  {
> @@ -129,9 +162,12 @@ static umode_t power_supply_hwmon_is_visible(const void *data,
>  	const struct power_supply_hwmon *psyhw = data;
>  	int prop;
>  
> -
> -	if (power_supply_hwmon_is_a_label(type, attr))
> -		return 0444;
> +	if (power_supply_hwmon_is_a_label(type, attr)) {
> +		if (power_supply_hwmon_has_input(psyhw, type, channel))
> +			return 0444;
> +		else
> +			return 0;
> +	}
>  
>  	prop = power_supply_hwmon_to_property(type, attr, channel);
>  	if (prop < 0 || !test_bit(prop, psyhw->props))
> -- 
> 2.20.1
> 

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