hwmon/w83793: Remove the description of AMDSI and update the voltage formula

Fix the driver to match the information in datasheet 1.0. AMD 
SI interface is marked as reserved, computing formula for 5VDD
and 5VSB is updated.
Signed-off-by: Gong Jun <jgong@winbond.com>
Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/w83793.c

@@ -117,6 +117,7 @@ static const u16 W83793_REG_IN[][3] = {
 /* Low Bits of Vcore A/B Vtt Read/High/Low */
 static const u16 W83793_REG_IN_LOW_BITS[] = { 0x1b, 0x68, 0x69 };
 static u8 scale_in[] = { 2, 2, 2, 16, 16, 16, 8, 24, 24, 16 };
+static u8 scale_in_add[] = { 0, 0, 0, 0, 0, 0, 0, 150, 150, 0 };
 
 #define W83793_REG_FAN(index)		(0x23 + 2 * (index))	/* High byte */
 #define W83793_REG_FAN_MIN(index)	(0x90 + 2 * (index))	/* High byte */
@@ -500,7 +501,7 @@ store_temp(struct device *dev, struct device_attribute *attr,
 	each has 4 mode:(2 bits)
 	0:	Stop monitor
 	1:	Use internal temp sensor(default)
-	2:	Use sensor in AMD CPU and get result by AMDSI
+	2:	Reserved
 	3:	Use sensor in Intel CPU and get result by PECI
 
 	TR1-TR2
@@ -509,8 +510,8 @@ store_temp(struct device *dev, struct device_attribute *attr,
 	1:	To enable temp sensors monitor
 */
 
-/* 0 disable, 5 AMDSI, 6 PECI */
-static u8 TO_TEMP_MODE[] = { 0, 0, 5, 6 };
+/* 0 disable, 6 PECI */
+static u8 TO_TEMP_MODE[] = { 0, 0, 0, 6 };
 
 static ssize_t
 show_temp_mode(struct device *dev, struct device_attribute *attr, char *buf)
@@ -550,7 +551,7 @@ store_temp_mode(struct device *dev, struct device_attribute *attr,
 	u8 val = simple_strtoul(buf, NULL, 10);
 
 	/* transform the sysfs interface values into table above */
-	if ((val == 5 || val == 6) && (index < 4)) {
+	if ((val == 6) && (index < 4)) {
 		val -= 3;
 	} else if ((val == 3 && index < 4)
 		|| (val == 4 && index >= 4)
@@ -839,7 +840,9 @@ show_in(struct device *dev, struct device_attribute *attr, char *buf)
 		val <<= 2;
 		val += (data->in_low_bits[nr] >> (index * 2)) & 0x3;
 	}
-	return sprintf(buf, "%d\n", val * scale_in[index]);
+	/* voltage inputs 5VDD and 5VSB needs 150mV offset */
+	val = val * scale_in[index] + scale_in_add[index];
+	return sprintf(buf, "%d\n", val);
 }
 
 static ssize_t
@@ -859,6 +862,10 @@ store_in(struct device *dev, struct device_attribute *attr,
 	     scale_in[index] / 2) / scale_in[index];
 	mutex_lock(&data->update_lock);
 	if (index > 2) {
+		/* fix the limit values of 5VDD and 5VSB to ALARM mechanism */
+		if (1 == nr || 2 == nr) {
+			val -= scale_in_add[index] / scale_in[index];
+		}
 		val = SENSORS_LIMIT(val, 0, 255);
 	} else {
 		val = SENSORS_LIMIT(val, 0, 0x3FF);