linux-kernel - Re: [PATCH] staging:iio:ad7150: fix threshold mode config bit

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Date:   Sun, 19 May 2019 11:29:52 +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] staging:iio:ad7150: fix threshold mode config bit

On Sat, 18 May 2019 22:04:56 -0300
Melissa Wen <melissa.srw@...il.com> wrote:

> According to the AD7150 configuration register description, bit 7 assumes
> value 1 when the threshold mode is fixed and 0 when it is adaptive,
> however, the operation that identifies this mode was considering the
> opposite values.
> 
> This patch renames the boolean variable to describe it correctly and
> properly replaces it in the places where it is used.
> 
> Fixes: 531efd6aa0991 ("staging:iio:adc:ad7150: chan_spec conv + i2c_smbus commands + drop unused poweroff timeout control.")
> Signed-off-by: Melissa Wen <melissa.srw@...il.com>

Looks good to me.  Applied to the fixes-togreg branch of iio.git pushed out as
as testing-fixes for the autobuilders to see if they can find anything
we have missed.

Thanks,

Jonathan

> ---
>  drivers/staging/iio/cdc/ad7150.c | 19 +++++++++++--------
>  1 file changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/staging/iio/cdc/ad7150.c b/drivers/staging/iio/cdc/ad7150.c
> index dd7fcab8e19e..e075244c602b 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>
> @@ -130,7 +131,7 @@ static int ad7150_read_event_config(struct iio_dev *indio_dev,
>  {
>  	int ret;
>  	u8 threshtype;
> -	bool adaptive;
> +	bool thrfixed;
>  	struct ad7150_chip_info *chip = iio_priv(indio_dev);
>  
>  	ret = i2c_smbus_read_byte_data(chip->client, AD7150_CFG);
> @@ -138,21 +139,23 @@ static int ad7150_read_event_config(struct iio_dev *indio_dev,
>  		return ret;
>  
>  	threshtype = (ret >> 5) & 0x03;
> -	adaptive = !!(ret & 0x80);
> +
> +	/*check if threshold mode is fixed or adaptive*/
> +	thrfixed = FIELD_GET(AD7150_CFG_FIX, ret);
>  
>  	switch (type) {
>  	case IIO_EV_TYPE_MAG_ADAPTIVE:
>  		if (dir == IIO_EV_DIR_RISING)
> -			return adaptive && (threshtype == 0x1);
> -		return adaptive && (threshtype == 0x0);
> +			return !thrfixed && (threshtype == 0x1);
> +		return !thrfixed && (threshtype == 0x0);
>  	case IIO_EV_TYPE_THRESH_ADAPTIVE:
>  		if (dir == IIO_EV_DIR_RISING)
> -			return adaptive && (threshtype == 0x3);
> -		return adaptive && (threshtype == 0x2);
> +			return !thrfixed && (threshtype == 0x3);
> +		return !thrfixed && (threshtype == 0x2);
>  	case IIO_EV_TYPE_THRESH:
>  		if (dir == IIO_EV_DIR_RISING)
> -			return !adaptive && (threshtype == 0x1);
> -		return !adaptive && (threshtype == 0x0);
> +			return thrfixed && (threshtype == 0x1);
> +		return thrfixed && (threshtype == 0x0);
>  	default:
>  		break;
>  	}