linux-kernel - Re: [PATCH 3/7] power: supply: core: fix HWMON temperature labels

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Date:   Thu, 2 Apr 2020 07:52:19 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Sebastian Reichel "(maintainer:POWER" SUPPLY CLASS/SUBSYSTEM
         and "DRIVERS,blamed_fixes:1/1=100%)" 
        <sebastian.reichel@...labora.com>,
        "Andrey Smirnov (blamed_fixes:1/1=100%)" <andrew.smirnov@...il.com>
Cc:     "open list:POWER SUPPLY CLASS/SUBSYSTEM and DRIVERS" 
        <linux-pm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/7] power: supply: core: fix HWMON temperature labels

On 4/2/20 7:46 AM, Michał Mirosław wrote:
> tempX_label files are swapped compared to what
> power_supply_hwmon_temp_to_property() uses. Make them match.
> While at it, make room for labeling other channels.
> 
> Fixes: e67d4dfc9ff1 ("power: supply: Add HWMON compatibility layer")
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---
>  drivers/power/supply/power_supply_hwmon.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/power_supply_hwmon.c b/drivers/power/supply/power_supply_hwmon.c
> index 75cf861ba492..83318a21fb52 100644
> --- a/drivers/power/supply/power_supply_hwmon.c
> +++ b/drivers/power/supply/power_supply_hwmon.c
> @@ -43,6 +43,11 @@ static int power_supply_hwmon_curr_to_property(u32 attr)
>  	}
>  }
>  
> +static const char *const ps_temp_label[] = {
> +	"temp",
> +	"ambient temp",
> +};
> +
>  static int power_supply_hwmon_temp_to_property(u32 attr, int channel)
>  {
>  	if (channel) {
> @@ -144,7 +149,14 @@ static int power_supply_hwmon_read_string(struct device *dev,
>  					  u32 attr, int channel,
>  					  const char **str)
>  {
> -	*str = channel ? "temp" : "temp ambient";
> +	switch (type) {
> +	case hwmon_temp:
> +		*str = ps_temp_label[channel];
> +		break;
> +	default:
> +		break;

That returns "no error" without setting *str, which is really asking for trouble.

Guenter

> +	}
> +
>  	return 0;
>  }
>  
>