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Date:   Sun, 3 May 2020 00:24:23 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH v4 1/4] power: supply: core: tabularize HWMON temperature
 labels

Hi,

On Fri, May 01, 2020 at 05:11:18PM +0200, Michał Mirosław wrote:
> Rework power_supply_hwmon_read_string() to check it's parameters.
> This allows to extend it later with labels for other types of
> measurements.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---
> v2: split from fix temperature labels
> v3: remove power_supply_hwmon_read_string() parameter checks
>     as it is internal API (suggested by Guenter Roeck)
> v4: remove unreachable() as it triggers compiler bugs
> ---

Thanks, queued.

-- Sebastian

>  drivers/power/supply/power_supply_hwmon.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/power_supply_hwmon.c b/drivers/power/supply/power_supply_hwmon.c
> index af72e5693f65..f5d538485aaa 100644
> --- a/drivers/power/supply/power_supply_hwmon.c
> +++ b/drivers/power/supply/power_supply_hwmon.c
> @@ -13,6 +13,11 @@ struct power_supply_hwmon {
>  	unsigned long *props;
>  };
>  
> +static const char *const ps_temp_label[] = {
> +	"temp",
> +	"ambient temp",
> +};
> +
>  static int power_supply_hwmon_in_to_property(u32 attr)
>  {
>  	switch (attr) {
> @@ -180,7 +185,20 @@ static int power_supply_hwmon_read_string(struct device *dev,
>  					  u32 attr, int channel,
>  					  const char **str)
>  {
> -	*str = channel ? "temp ambient" : "temp";
> +	switch (type) {
> +	case hwmon_temp:
> +		*str = ps_temp_label[channel];
> +		break;
> +	default:
> +		/* unreachable, but see:
> +		 * gcc bug #51513 [1] and clang bug #978 [2]
> +		 *
> +		 * [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51513
> +		 * [2] https://github.com/ClangBuiltLinux/linux/issues/978
> +		 */
> +		break;
> +	}
> +
>  	return 0;
>  }
>  
> -- 
> 2.20.1
> 

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