From: Guenter Roeck <linux@roeck-us.net>
To: lm-sensors@vger.kernel.org
Subject: [lm-sensors] [PATCH 3/3] hwmon: (lm73) Fix lower and upper temperature limits
Date: Fri, 11 Jan 2013 14:46:09 +0000 [thread overview]
Message-ID: <1357915569-6669-3-git-send-email-linux@roeck-us.net> (raw)
While the LM73 is only specified for temperatures from -40 to +150 degrees C,
its power-up minimum and maximum temperature limits are -256 and +255.75
degrees C. For better consistency and to avoid confusion, clamp limits to
the power-up limits and not to -40 / +150 degrees C.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/lm73.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/hwmon/lm73.c b/drivers/hwmon/lm73.c
index 6f0134e..9bde964 100644
--- a/drivers/hwmon/lm73.c
+++ b/drivers/hwmon/lm73.c
@@ -37,8 +37,8 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
#define LM73_ID 0x9001 /* 0x0190, byte-swapped */
#define DRVNAME "lm73"
-#define LM73_TEMP_MIN (-40)
-#define LM73_TEMP_MAX 150
+#define LM73_TEMP_MIN (-256000 / 250)
+#define LM73_TEMP_MAX (255750 / 250)
#define LM73_CTRL_RES_SHIFT 5
#define LM73_CTRL_RES_MASK (BIT(5) | BIT(6))
@@ -76,8 +76,7 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *da,
return status;
/* Write value */
- value = (short) clamp_val(temp / 250, LM73_TEMP_MIN * 4,
- LM73_TEMP_MAX * 4) << 5;
+ value = clamp_val(temp / 250, LM73_TEMP_MIN, LM73_TEMP_MAX) << 5;
err = i2c_smbus_write_word_swapped(client, attr->index, value);
return (err < 0) ? err : count;
}
--
1.7.9.7
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