linux-kernel - Re: [PATCH v2 1/3] staging: iio: ad7150: use FIELD

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Date:   Sun, 16 Jun 2019 11:18:02 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Melissa Wen <melissa.srw@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Stefan Popa <stefan.popa@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Barry Song <21cnbao@...il.com>, linux-iio@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        kernel-usp@...glegroups.com
Subject: Re: [PATCH v2 1/3] staging: iio: ad7150: use FIELD_GET and GENMASK

On Fri, 14 Jun 2019 13:32:21 -0300
Melissa Wen <melissa.srw@...il.com> wrote:

> Use the bitfield macro FIELD_GET, and GENMASK to do the shift and mask in
> one go. This makes the code more readable than explicit masking followed
> by a shift.
> 
> Signed-off-by: Melissa Wen <melissa.srw@...il.com>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to paly with it.

Thanks,

Jonathan

> ---
>  drivers/staging/iio/cdc/ad7150.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/iio/cdc/ad7150.c b/drivers/staging/iio/cdc/ad7150.c
> index 8234da4b8c65..091aa33589d7 100644
> --- a/drivers/staging/iio/cdc/ad7150.c
> +++ b/drivers/staging/iio/cdc/ad7150.c
> @@ -5,6 +5,7 @@
>   * Copyright 2010-2011 Analog Devices Inc.
>   */
>  
> +#include <linux/bitfield.h>
>  #include <linux/interrupt.h>
>  #include <linux/device.h>
>  #include <linux/kernel.h>
> @@ -45,6 +46,9 @@
>  #define AD7150_SN0                 22
>  #define AD7150_ID                  23
>  
> +/* AD7150 masks */
> +#define AD7150_THRESHTYPE_MSK			GENMASK(6, 5)
> +
>  /**
>   * struct ad7150_chip_info - instance specific chip data
>   * @client: i2c client for this device
> @@ -137,7 +141,7 @@ static int ad7150_read_event_config(struct iio_dev *indio_dev,
>  	if (ret < 0)
>  		return ret;
>  
> -	threshtype = (ret >> 5) & 0x03;
> +	threshtype = FIELD_GET(AD7150_THRESHTYPE_MSK, ret);
>  	adaptive = !!(ret & 0x80);
>  
>  	switch (type) {