hwmon: (f71882fg) Cleanup fan and temp hyst functions

Simplify fan and temp hyst. handling by treating the registers as an array of
nibbles instead of using switch cases. Also unify the way hysts are handled
between temp and fans, the temp code was storing the actual per temp hyst
values in 4 u8's, where as the fan code was storing actual register values.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/hwmon/f71882fg.c

@@ -68,8 +68,7 @@
 #define F71882FG_REG_TEMP_HIGH(nr)	(0x81 + 2 * (nr))
 #define F71882FG_REG_TEMP_STATUS	0x62
 #define F71882FG_REG_TEMP_BEEP		0x63
-#define F71882FG_REG_TEMP_HYST1		0x6C
-#define F71882FG_REG_TEMP_HYST23	0x6D
+#define F71882FG_REG_TEMP_HYST(nr)	(0x6C + (nr))
 #define F71882FG_REG_TEMP_TYPE		0x6B
 #define F71882FG_REG_TEMP_DIODE_OPEN	0x6F
 
@@ -77,8 +76,7 @@
 #define F71882FG_REG_PWM_TYPE		0x94
 #define F71882FG_REG_PWM_ENABLE		0x96
 
-#define F71882FG_REG_FAN_HYST0		0x98
-#define F71882FG_REG_FAN_HYST1		0x99
+#define F71882FG_REG_FAN_HYST(nr)	(0x98 + (nr))
 
 #define F71882FG_REG_POINT_PWM(pwm, point)	(0xAA + (point) + (16 * (pwm)))
 #define F71882FG_REG_POINT_TEMP(pwm, point)	(0xA6 + (point) + (16 * (pwm)))
@@ -144,7 +142,7 @@ struct f71882fg_data {
 	u8	temp[4];
 	u8	temp_ovt[4];
 	u8	temp_high[4];
-	u8	temp_hyst[4];
+	u8	temp_hyst[2]; /* 2 hysts stored per reg */
 	u8	temp_type[4];
 	u8	temp_status;
 	u8	temp_beep;
@@ -688,13 +686,11 @@ static struct f71882fg_data *f71882fg_update_device(struct device *dev)
 						F71882FG_REG_TEMP_HIGH(nr));
 		}
 
-		/* Have to hardcode hyst*/
-		data->temp_hyst[1] = f71882fg_read8(data,
-						F71882FG_REG_TEMP_HYST1) >> 4;
-		/* Hyst temps 2 & 3 stored in same register */
-		reg = f71882fg_read8(data, F71882FG_REG_TEMP_HYST23);
-		data->temp_hyst[2] = reg & 0x0F;
-		data->temp_hyst[3] = reg >> 4;
+		/* hyst */
+		data->temp_hyst[0] =
+			f71882fg_read8(data, F71882FG_REG_TEMP_HYST(0));
+		data->temp_hyst[1] =
+			f71882fg_read8(data, F71882FG_REG_TEMP_HYST(1));
 
 		/* Have to hardcode type, because temp1 is special */
 		reg  = f71882fg_read8(data, F71882FG_REG_TEMP_TYPE);
@@ -715,10 +711,11 @@ static struct f71882fg_data *f71882fg_update_device(struct device *dev)
 
 		data->pwm_enable = f71882fg_read8(data,
 						  F71882FG_REG_PWM_ENABLE);
-		data->pwm_auto_point_hyst[0] = f71882fg_read8(data,
-						      F71882FG_REG_FAN_HYST0);
-		data->pwm_auto_point_hyst[1] = f71882fg_read8(data,
-						      F71882FG_REG_FAN_HYST1);
+		data->pwm_auto_point_hyst[0] =
+			f71882fg_read8(data, F71882FG_REG_FAN_HYST(0));
+		data->pwm_auto_point_hyst[1] =
+			f71882fg_read8(data, F71882FG_REG_FAN_HYST(1));
+
 		for (nr = 0; nr < nr_fans; nr++) {
 			data->pwm_auto_point_mapping[nr] =
 			    f71882fg_read8(data,
@@ -1011,7 +1008,11 @@ static ssize_t show_temp_max_hyst(struct device *dev, struct device_attribute
 	int temp_max_hyst;
 
 	mutex_lock(&data->update_lock);
-	temp_max_hyst = (data->temp_high[nr] - data->temp_hyst[nr]) * 1000;
+	if (nr & 1)
+		temp_max_hyst = data->temp_hyst[nr / 2] >> 4;
+	else
+		temp_max_hyst = data->temp_hyst[nr / 2] & 0x0f;
+	temp_max_hyst = (data->temp_high[nr] - temp_max_hyst) * 1000;
 	mutex_unlock(&data->update_lock);
 
 	return sprintf(buf, "%d\n", temp_max_hyst);
@@ -1033,26 +1034,15 @@ static ssize_t store_temp_max_hyst(struct device *dev, struct device_attribute
 	val = SENSORS_LIMIT(val, data->temp_high[nr] - 15,
 			    data->temp_high[nr]);
 	val = data->temp_high[nr] - val;
-	data->temp_hyst[nr] = val;
 
 	/* convert value to register contents */
-	switch (nr) {
-		case 1:
-			reg = f71882fg_read8(data, F71882FG_REG_TEMP_HYST1);
-			reg = (reg & 0x0f) | (val << 4);
-			break;
-		case 2:
-			reg = f71882fg_read8(data, F71882FG_REG_TEMP_HYST23);
-			reg = (reg & 0xf0) | val;
-			break;
-		case 3:
-			reg = f71882fg_read8(data, F71882FG_REG_TEMP_HYST23);
-			reg = (reg & 0x0f) | (val << 4);
-			break;
-	}
-
-	f71882fg_write8(data, (nr <= 1) ? F71882FG_REG_TEMP_HYST1 :
-		F71882FG_REG_TEMP_HYST23, reg);
+	reg = f71882fg_read8(data, F71882FG_REG_TEMP_HYST(nr / 2));
+	if (nr & 1)
+		reg = (reg & 0x0f) | (val << 4);
+	else
+		reg = (reg & 0xf0) | val;
+	f71882fg_write8(data, F71882FG_REG_TEMP_HYST(nr / 2), reg);
+	data->temp_hyst[nr / 2] = reg;
 
 	mutex_unlock(&data->update_lock);
 	return ret;
@@ -1091,7 +1081,11 @@ static ssize_t show_temp_crit_hyst(struct device *dev, struct device_attribute
 	int temp_crit_hyst;
 
 	mutex_lock(&data->update_lock);
-	temp_crit_hyst = (data->temp_ovt[nr] - data->temp_hyst[nr]) * 1000;
+	if (nr & 1)
+		temp_crit_hyst = data->temp_hyst[nr / 2] >> 4;
+	else
+		temp_crit_hyst = data->temp_hyst[nr / 2] & 0x0f;
+	temp_crit_hyst = (data->temp_ovt[nr] - temp_crit_hyst) * 1000;
 	mutex_unlock(&data->update_lock);
 
 	return sprintf(buf, "%d\n", temp_crit_hyst);
@@ -1320,20 +1314,10 @@ static ssize_t show_pwm_auto_point_temp_hyst(struct device *dev,
 	int point = to_sensor_dev_attr_2(devattr)->nr;
 
 	mutex_lock(&data->update_lock);
-	switch (nr) {
-	case 0:
-		result = data->pwm_auto_point_hyst[0] & 0x0f;
-		break;
-	case 1:
-		result = data->pwm_auto_point_hyst[0] >> 4;
-		break;
-	case 2:
-		result = data->pwm_auto_point_hyst[1] & 0x0f;
-		break;
-	case 3:
-		result = data->pwm_auto_point_hyst[1] >> 4;
-		break;
-	}
+	if (nr & 1)
+		result = data->pwm_auto_point_hyst[nr / 2] >> 4;
+	else
+		result = data->pwm_auto_point_hyst[nr / 2] & 0x0f;
 	result = 1000 * (data->pwm_auto_point_temp[nr][point] - result);
 	mutex_unlock(&data->update_lock);
 
@@ -1348,6 +1332,7 @@ static ssize_t store_pwm_auto_point_temp_hyst(struct device *dev,
 	int nr = to_sensor_dev_attr_2(devattr)->index;
 	int point = to_sensor_dev_attr_2(devattr)->nr;
 	long val = simple_strtol(buf, NULL, 10) / 1000;
+	u8 reg;
 
 	mutex_lock(&data->update_lock);
 	data->pwm_auto_point_temp[nr][point] =
@@ -1356,34 +1341,14 @@ static ssize_t store_pwm_auto_point_temp_hyst(struct device *dev,
 				data->pwm_auto_point_temp[nr][point]);
 	val = data->pwm_auto_point_temp[nr][point] - val;
 
-	if (nr == 0 || nr == 1) {
-		data->pwm_auto_point_hyst[0] =
-			f71882fg_read8(data, F71882FG_REG_FAN_HYST0);
-	} else {
-		data->pwm_auto_point_hyst[1] =
-			f71882fg_read8(data, F71882FG_REG_FAN_HYST1);
-	}
-	switch (nr) {
-	case 0:
-		val = (data->pwm_auto_point_hyst[0] & 0xf0) | val;
-		break;
-	case 1:
-		val = (data->pwm_auto_point_hyst[0] & 0x0f) | (val << 4);
-		break;
-	case 2:
-		val = (data->pwm_auto_point_hyst[1] & 0xf0) | val;
-		break;
-	case 3:
-		val = (data->pwm_auto_point_hyst[1] & 0x0f) | (val << 4);
-		break;
-	}
-	if (nr == 0 || nr == 1) {
-		f71882fg_write8(data, F71882FG_REG_FAN_HYST0, val);
-		data->pwm_auto_point_hyst[0] = val;
-	} else {
-		f71882fg_write8(data, F71882FG_REG_FAN_HYST1, val);
-		data->pwm_auto_point_hyst[1] = val;
-	}
+	reg = f71882fg_read8(data, F71882FG_REG_FAN_HYST(nr / 2));
+	if (nr & 1)
+		reg = (reg & 0x0f) | (val << 4);
+	else
+		reg = (reg & 0xf0) | val;
+
+	f71882fg_write8(data, F71882FG_REG_FAN_HYST(nr / 2), reg);
+	data->pwm_auto_point_hyst[nr / 2] = reg;
 	mutex_unlock(&data->update_lock);
 
 	return count;