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-rw-r--r--drivers/hwmon/adt7473.c29
1 files changed, 9 insertions, 20 deletions
diff --git a/drivers/hwmon/adt7473.c b/drivers/hwmon/adt7473.c
index 3a0b63136479..b9a8ea30c99c 100644
--- a/drivers/hwmon/adt7473.c
+++ b/drivers/hwmon/adt7473.c
@@ -319,35 +319,24 @@ out:
}
/*
- * On this chip, voltages are given as a count of steps between a minimum
- * and maximum voltage, not a direct voltage.
+ * Conversions
*/
-static const int volt_convert_table[][2] = {
- {2997, 3},
- {4395, 4},
+
+/* IN are scaled acording to built-in resistors */
+static const int adt7473_scaling[] = { /* .001 Volts */
+ 2250, 3300
};
+#define SCALE(val, from, to) (((val) * (to) + ((from) / 2)) / (from))
static int decode_volt(int volt_index, u8 raw)
{
- int cmax = volt_convert_table[volt_index][0];
- int cmin = volt_convert_table[volt_index][1];
- return ((raw * (cmax - cmin)) / 255) + cmin;
+ return SCALE(raw, 192, adt7473_scaling[volt_index]);
}
static u8 encode_volt(int volt_index, int cooked)
{
- int cmax = volt_convert_table[volt_index][0];
- int cmin = volt_convert_table[volt_index][1];
- u8 x;
-
- if (cooked > cmax)
- cooked = cmax;
- else if (cooked < cmin)
- cooked = cmin;
-
- x = ((cooked - cmin) * 255) / (cmax - cmin);
-
- return x;
+ int raw = SCALE(cooked, adt7473_scaling[volt_index], 192);
+ return SENSORS_LIMIT(raw, 0, 255);
}
static ssize_t show_volt_min(struct device *dev,

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