linux-kernel - Re: [PATCH 1/2] iio: adc: twl4030_madc: Fix calculation of the temperature sense current

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Date:	Sun, 07 Jun 2015 17:25:35 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Marek Belisko <marek@...delico.com>
CC:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	hns@...delico.com
Subject: Re: [PATCH 1/2] iio: adc: twl4030_madc: Fix calculation of the temperature
 sense current

On 28/05/15 20:50, Marek Belisko wrote:
> From: "H. Nikolaus Schaller" <hns@...delico.com>
> 
> The bit mask to read the setting of the constant current source
> for measuring the NTC voltage was the wrong one. Since default
> value is initialized to the lowest level (000 = 10uA) the difference
> was probably never noticed in practice.
I'm going to take that literally and apply it via the slow route on
the basis that a bug no one noticed doesn't need fixing fast!
> 
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> Signed-off-by: Marek Belisko <marek@...delico.com>
Applied to the togreg branch of iio.git - initially pushed out as
testing for the autobuilders to play with it.

Thanks,

Jonathan
> ---
>  drivers/iio/adc/twl4030-madc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/twl4030-madc.c b/drivers/iio/adc/twl4030-madc.c
> index 94c5f05..6d2d429 100644
> --- a/drivers/iio/adc/twl4030-madc.c
> +++ b/drivers/iio/adc/twl4030-madc.c
> @@ -235,7 +235,7 @@ static int twl4030battery_temperature(int raw_volt)
>  	if (ret < 0)
>  		return ret;
>  
> -	curr = ((val & TWL4030_BCI_ITHEN) + 1) * 10;
> +	curr = ((val & TWL4030_BCI_ITHSENS) + 1) * 10;
>  	/* Getting and calculating the thermistor resistance in ohms */
>  	res = volt * 1000 / curr;
>  	/* calculating temperature */
> 

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