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hwmon: (max6621) fix temperature clamp range

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MAX6621_TEMP_INPUT_MIN and MAX6621_TEMP_INPUT_MAX are used to clamp the
writable offset and critical thresholds. They are defined as -127000 and
128000.

The driver decodes the temperature through an s8 and its own comment in
max6621_read() documents an 8-bit two's complement value, whose range is
-128 to +127 degrees C. The current limits therefore reject the valid
-128 degrees C and accept +128 degrees C, which does not fit the 8-bit
range.

Correct the limits to -128000 and 127000.

Fixes: 92b64580f1 ("hwmon: (max6621) Add support for Maxim MAX6621 temperature sensor")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-4
Signed-off-by: Cong Nguyen <congnt264@gmail.com>
Link: https://lore.kernel.org/r/9d3a4f1895a47794bb359a2a32fb1ccd6a15812c.1786334038.git.congnt264@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Cong Nguyen 2026-08-10 11:27:54 +07:00 committed by Guenter Roeck
parent 21b21a8c20
commit 24fbeb83d9
1 changed files with 2 additions and 2 deletions
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4
drivers/hwmon/max6621.c
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@ -17,8 +17,8 @@
#define MAX6621_DRV_NAME "max6621"
#define MAX6621_TEMP_INPUT_REG_NUM 9
#define MAX6621_TEMP_INPUT_MIN -127000
#define MAX6621_TEMP_INPUT_MAX 128000
#define MAX6621_TEMP_INPUT_MIN -128000
#define MAX6621_TEMP_INPUT_MAX 127000
#define MAX6621_TEMP_ALERT_CHAN_SHIFT 1
#define MAX6621_TEMP_S0D0_REG 0x00