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hwmon: (lm73) Fix lower and upper temperature limits

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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>
This commit is contained in:
Guenter Roeck 2013-01-10 21:16:47 -08:00
parent b06367070d
commit 91bba68801
1 changed files with 3 additions and 4 deletions
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7
drivers/hwmon/lm73.c
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@ -36,8 +36,8 @@ 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)
/*-----------------------------------------------------------------------*/
@ -56,8 +56,7 @@ 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;
}