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

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Date:	Sun, 2 Aug 2015 19:35:51 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>
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 02/08/15 17:37, Dan Carpenter wrote:
> 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
*laughs*. Good point ;)
> 
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