linux-kernel - Re: [PATCH v5 03/11] staging: iio: ad7780: add gain reading to ad778x

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Date:   Sat, 16 Mar 2019 17:54:23 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Renato Lui Geh <renatogeh@...il.com>
Cc:     lars@...afoo.de, Michael.Hennerich@...log.com, knaack.h@....de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org,
        stefan.popa@...log.com, alexandru.Ardelean@...log.com,
        giuliano.belinassi@....br, robh+dt@...nel.org,
        mark.rutland@....com, linux-iio@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        kernel-usp@...glegroups.com, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 03/11] staging: iio: ad7780: add gain reading to
 ad778x

On Fri, 15 Mar 2019 23:13:13 -0300
Renato Lui Geh <renatogeh@...il.com> wrote:

> This patch adds a new functionality of reading gain values from the
> ad778x chips. This value is stored in the chip's state struct and is
> updated whenever a read or write call is performed on the driver.
> 
> Signed-off-by: Renato Lui Geh <renatogeh@...il.com>

Applied, thanks

> ---
>  drivers/staging/iio/adc/ad7780.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
> index f4cd7bc3e02f..fbcc0d3345ca 100644
> --- a/drivers/staging/iio/adc/ad7780.c
> +++ b/drivers/staging/iio/adc/ad7780.c
> @@ -42,6 +42,8 @@
>  #define AD7780_GAIN_MIDPOINT	64
>  #define AD7780_FILTER_MIDPOINT	13350
>  
> +static const unsigned int ad778x_gain[2] = { 1, 128 };
> +
>  struct ad7780_chip_info {
>  	struct iio_chan_spec	channel;
>  	unsigned int		pattern_mask;
> @@ -179,6 +181,9 @@ static int ad7780_postprocess_sample(struct ad_sigma_delta *sigma_delta,
>  	    ((raw_sample & chip_info->pattern_mask) != chip_info->pattern))
>  		return -EIO;
>  
> +	if (chip_info->is_ad778x)
> +		st->gain = ad778x_gain[raw_sample & AD7780_GAIN];
> +
>  	return 0;
>  }
>