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,