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

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  Re: [PATCH v2 2/2] iio: magnetometer: add mmc34160 magnetometer  driver Jonathan Cameron <jic23@kernel.org> - 2015-08-02 18:40 +0200
    Re: [PATCH v2 2/2] iio: magnetometer: add mmc34160 magnetometer  driver Dan Carpenter <dan.carpenter@oracle.com> - 2015-08-02 18:40 +0200

#1198405 — 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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#1198435

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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