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

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Date:	Sun, 2 Aug 2015 19:37:27 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Jonathan Cameron <jic23@...nel.org>
Cc:	Teodora Baluta <teodora.baluta@...el.com>, 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 Sun, Aug 02, 2015 at 05:32:30PM +0100, Jonathan Cameron wrote:
> 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?
> 

Yeah.  Or this:

static int mmc34160_raw_to_mgauss(int raw[3], int sens[3], int nfo, int index)
{
	return (raw[index] - nfo) * 1000 / sens[index];
}

regards,
dan carpenter

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