staging:iio:ad7150: fix threshold mode config bit
diff mbox series

Message ID 20190519010456.lwq7n2e6nkqa6niz@smtp.gmail.com
State New
Headers show
Series
  • staging:iio:ad7150: fix threshold mode config bit
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Commit Message

Melissa Wen May 19, 2019, 1:04 a.m. UTC
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@gmail.com>
---
 drivers/staging/iio/cdc/ad7150.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

Comments

Jonathan Cameron May 19, 2019, 10:29 a.m. UTC | #1
On Sat, 18 May 2019 22:04:56 -0300
Melissa Wen <melissa.srw@gmail.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@gmail.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;
>  	}
Alexandru Ardelean May 20, 2019, 9:59 a.m. UTC | #2
On Sun, May 19, 2019 at 8:38 PM Jonathan Cameron <jic23@kernel.org> wrote:
>
> On Sat, 18 May 2019 22:04:56 -0300
> Melissa Wen <melissa.srw@gmail.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@gmail.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);

nitpick: i would have kept the original variable name as "adaptive",
mostly for consistency.
"adaptive" is used in other places as well;

as i recall, the fix is just oneliner in this case:

- adaptive = !!(ret & 0x80);
+ adaptive = !(ret & 0x80);


> >
> >       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;
> >       }
>

Patch
diff mbox series

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;
 	}