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

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Message-ID: <20150720141424.GJ5422@mwanda>
Date:	Mon, 20 Jul 2015 17:14:24 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Teodora Baluta <teodora.baluta@...el.com>
Cc:	jic23@...nel.org, 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 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;
}

regards,
dan carpenter

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