staging:iio:ad7150: fix threshold mode config bit

[ Upstream commit df4d737ee4d7205aaa6275158aeebff87fd14488 ]

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>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/staging/iio/cdc/ad7150.c b/drivers/staging/iio/cdc/ad7150.c
index 50a5b0c2cc7b56ac7842acdfff216aa74b92febb..7ab95efcf1dcf9e551f4e4fdc77dd6d4cbbf3a94 100644 (file)
--- a/drivers/staging/iio/cdc/ad7150.c
+++ b/drivers/staging/iio/cdc/ad7150.c
@@ -6,6 +6,7 @@
  * Licensed under the GPL-2 or later.
  */
 
+#include <linux/bitfield.h>
 #include <linux/interrupt.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
@@ -129,7 +130,7 @@ 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);
@@ -137,21 +138,23 @@ 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;
        }