linux-kernel - Re: [PATCH v2 2/2] iio: magnetometer: add mmc34160 magnetometer driver

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Date:	Sun, 2 Aug 2015 17:32:30 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Teodora Baluta <teodora.baluta@...el.com>
Cc:	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
	daniel.baluta@...el.com, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] iio: magnetometer: add mmc34160 magnetometer
 driver

On 20/07/15 15:14, Dan Carpenter wrote:
> On Mon, Jul 20, 2015 at 04:52:30PM +0300, Teodora Baluta wrote:
>> +static int mmc34160_raw_to_mgauss(int raw[3], int sens[3], int nfo,
>> +				  int index, int *val)
>> +{
>> +	switch (index) {
>> +	case AXIS_X:
>> +		*val = (raw[AXIS_X] - nfo) * 1000 / sens[AXIS_X];
>> +		break;
>> +	case AXIS_Y:
>> +		*val = (raw[AXIS_Y] - nfo) * 1000 / sens[AXIS_Y];
>> +		break;
>> +	case AXIS_Z:
>> +		*val = (raw[AXIS_Z] - nfo) * 1000 / sens[AXIS_Z];
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	return 0;
>> +}
> 
> We never pass invalid indexes here so this could be replaced with:
> 
> static int mmc34160_raw_to_mgauss(int raw[3], int sens[3], int nfo,
> 				  int index, int *val)
> {
> 	*val = (raw[index] - nfo) * 1000 / sens[index];
> 	return 0;
Even better change the function signature and don't return anything at 
all perhaps?

Anyhow, definitely worth making this change.

> }
> 
> regards,
> dan carpenter
> 

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