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 a6f249e9c1e1c6eab883208f5c912b60a2efa365..4d218d55487846106072dc0a27cdf715ed4d5780 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;
        }