linux-kernel - Re: [PATCH v3 3/3] hwmon: (adt7475) Use enum chips when loading attenuator settings

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Message-ID: <20220424165405.GA748437@roeck-us.net>
Date:   Sun, 24 Apr 2022 09:54:05 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     jdelvare@...e.com, robh+dt@...nel.org, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] hwmon: (adt7475) Use enum chips when loading
 attenuator settings

On Wed, Mar 23, 2022 at 04:40:56PM +1300, Chris Packham wrote:
> Make use of enum chips and use a switch statement in load_attenuators()
> so that the compiler can tell us if we've failed to cater for a
> supported chip.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>

For my reference:

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

Guenter

> ---
> 
> Notes:
>     Changes in v3:
>     - Reword commit message
>     - Use switch instead of if/else
>     Changes in v2:
>     - New
> 
>  drivers/hwmon/adt7475.c | 23 ++++++++++-------------
>  1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
> index 6de501de41b2..ac480e6e4818 100644
> --- a/drivers/hwmon/adt7475.c
> +++ b/drivers/hwmon/adt7475.c
> @@ -1569,12 +1569,12 @@ static int set_property_bit(const struct i2c_client *client, char *property,
>  	return ret;
>  }
>  
> -static int load_attenuators(const struct i2c_client *client, int chip,
> +static int load_attenuators(const struct i2c_client *client, enum chips chip,
>  			    struct adt7475_data *data)
>  {
> -	int ret;
> -
> -	if (chip == adt7476 || chip == adt7490) {
> +	switch (chip) {
> +	case adt7476:
> +	case adt7490:
>  		set_property_bit(client, "adi,bypass-attenuator-in0",
>  				 &data->config4, 4);
>  		set_property_bit(client, "adi,bypass-attenuator-in1",
> @@ -1584,18 +1584,15 @@ static int load_attenuators(const struct i2c_client *client, int chip,
>  		set_property_bit(client, "adi,bypass-attenuator-in4",
>  				 &data->config4, 7);
>  
> -		ret = i2c_smbus_write_byte_data(client, REG_CONFIG4,
> -						data->config4);
> -		if (ret < 0)
> -			return ret;
> -	} else if (chip == adt7473 || chip == adt7475) {
> +		return i2c_smbus_write_byte_data(client, REG_CONFIG4,
> +						 data->config4);
> +	case adt7473:
> +	case adt7475:
>  		set_property_bit(client, "adi,bypass-attenuator-in1",
>  				 &data->config2, 5);
>  
> -		ret = i2c_smbus_write_byte_data(client, REG_CONFIG2,
> -						data->config2);
> -		if (ret < 0)
> -			return ret;
> +		return i2c_smbus_write_byte_data(client, REG_CONFIG2,
> +						 data->config2);
>  	}
>  
>  	return 0;