linux-kernel - [PATCH v2 2/2] hwmon: (adt7475) Fix masking of hysteresis registers

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Date:   Wed, 22 Feb 2023 13:52:28 +1300
From:   Tony O'Brien <tony.obrien@...iedtelesis.co.nz>
To:     jdelvare@...e.com, linux@...ck-us.net, linux-hwmon@...r.kernel.org
Cc:     chris.packham@...iedtelesis.co.nz, hdegoede@...hat.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] hwmon: (adt7475) Fix masking of hysteresis registers

The wrong bits are masked in the hysteresis register; indices 0 and 2
should zero bits [7:4] and preserve bits [3:0], and index 1 should zero
bits [3:0] and preserve bits [7:4].

Fixes: 1c301fc5394f ("hwmon: Add a driver for the ADT7475 hardware monitoring chip")
Signed-off-by: Tony O'Brien <tony.obrien@...iedtelesis.co.nz>
---
Changes in v2:
- Patch headline changed.
- Removed erroneous fix for clamping the hysteresis value. It should be
  an absolute value and not a relative value.
 drivers/hwmon/adt7475.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
index 77222c35a38e..6e4c92b500b8 100644
--- a/drivers/hwmon/adt7475.c
+++ b/drivers/hwmon/adt7475.c
@@ -488,10 +488,10 @@ static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
 		val = (temp - val) / 1000;
 
 		if (sattr->index != 1) {
-			data->temp[HYSTERSIS][sattr->index] &= 0xF0;
+			data->temp[HYSTERSIS][sattr->index] &= 0x0F;
 			data->temp[HYSTERSIS][sattr->index] |= (val & 0xF) << 4;
 		} else {
-			data->temp[HYSTERSIS][sattr->index] &= 0x0F;
+			data->temp[HYSTERSIS][sattr->index] &= 0xF0;
 			data->temp[HYSTERSIS][sattr->index] |= (val & 0xF);
 		}
 
-- 
2.39.2