hwmon: (lm63) Consider LM64 temperature offset

commit 2778fb13 upstream.

LM64 has 16 degrees Celsius temperature offset on all
remote sensor registers.
This was not considered When LM64 support was added to lm63.c.
Signed-off-by: Dirk Eibach <eibach@gdsys.de>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/hwmon/lm63.c

@@ -98,6 +98,9 @@ static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };
  * value, it uses signed 8-bit values with LSB = 1 degree Celsius.
  * For remote temperature, low and high limits, it uses signed 11-bit values
  * with LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
+ * For LM64 the actual remote diode temperature is 16 degree Celsius higher
+ * than the register reading. Remote temperature setpoints have to be
+ * adapted accordingly.
  */
 
 #define FAN_FROM_REG(reg)	((reg) == 0xFFFC || (reg) == 0 ? 0 : \
@@ -165,6 +168,8 @@ struct lm63_data {
 	struct mutex update_lock;
 	char valid; /* zero until following fields are valid */
 	unsigned long last_updated; /* in jiffies */
+	int kind;
+	int temp2_offset;
 
 	/* registers values */
 	u8 config, config_fan;
@@ -247,7 +252,14 @@ static ssize_t show_pwm1_enable(struct device *dev, struct device_attribute *dum
 	return sprintf(buf, "%d\n", data->config_fan & 0x20 ? 1 : 2);
 }
 
-static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
+/*
+ * There are 8bit registers for both local(temp1) and remote(temp2) sensor.
+ * For remote sensor registers temp2_offset has to be considered,
+ * for local sensor it must not.
+ * So we need separate 8bit accessors for local and remote sensor.
+ */
+static ssize_t show_local_temp8(struct device *dev,
+				struct device_attribute *devattr,
 				char *buf)
 {
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
@@ -255,7 +267,18 @@ static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
 	return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[attr->index]));
 }
 
-static ssize_t set_temp8(struct device *dev, struct device_attribute *dummy,
+static ssize_t show_remote_temp8(struct device *dev,
+				 struct device_attribute *devattr,
+				 char *buf)
+{
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	struct lm63_data *data = lm63_update_device(dev);
+	return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[attr->index])
+		       + data->temp2_offset);
+}
+
+static ssize_t set_local_temp8(struct device *dev,
+			       struct device_attribute *dummy,
 			       const char *buf, size_t count)
 {
 	struct i2c_client *client = to_i2c_client(dev);
@@ -274,7 +297,8 @@ static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
 {
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	struct lm63_data *data = lm63_update_device(dev);
-	return sprintf(buf, "%d\n", TEMP11_FROM_REG(data->temp11[attr->index]));
+	return sprintf(buf, "%d\n", TEMP11_FROM_REG(data->temp11[attr->index])
+		       + data->temp2_offset);
 }
 
 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
@@ -294,7 +318,7 @@ static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
 	int nr = attr->index;
 
 	mutex_lock(&data->update_lock);
-	data->temp11[nr] = TEMP11_TO_REG(val);
+	data->temp11[nr] = TEMP11_TO_REG(val - data->temp2_offset);
 	i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
 				  data->temp11[nr] >> 8);
 	i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
@@ -310,6 +334,7 @@ static ssize_t show_temp2_crit_hyst(struct device *dev, struct device_attribute
 {
 	struct lm63_data *data = lm63_update_device(dev);
 	return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[2])
+		       + data->temp2_offset
 		       - TEMP8_FROM_REG(data->temp2_crit_hyst));
 }
 
@@ -324,7 +349,7 @@ static ssize_t set_temp2_crit_hyst(struct device *dev, struct device_attribute *
 	long hyst;
 
 	mutex_lock(&data->update_lock);
-	hyst = TEMP8_FROM_REG(data->temp8[2]) - val;
+	hyst = TEMP8_FROM_REG(data->temp8[2]) + data->temp2_offset - val;
 	i2c_smbus_write_byte_data(client, LM63_REG_REMOTE_TCRIT_HYST,
 				  HYST_TO_REG(hyst));
 	mutex_unlock(&data->update_lock);
@@ -355,16 +380,21 @@ static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan,
 static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm1, set_pwm1);
 static DEVICE_ATTR(pwm1_enable, S_IRUGO, show_pwm1_enable, NULL);
 
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
-static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
-	set_temp8, 1);
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_local_temp8, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_local_temp8,
+	set_local_temp8, 1);
 
 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
 	set_temp11, 1);
 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
 	set_temp11, 2);
-static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp8, NULL, 2);
+/*
+ * On LM63, temp2_crit can be set only once, which should be job
+ * of the bootloader.
+ */
+static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_remote_temp8,
+	NULL, 2);
 static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst,
 	set_temp2_crit_hyst);
 
@@ -479,7 +509,12 @@ static int lm63_probe(struct i2c_client *new_client,
 	data->valid = 0;
 	mutex_init(&data->update_lock);
 
-	/* Initialize the LM63 chip */
+	/* Set the device type */
+	data->kind = id->driver_data;
+	if (data->kind == lm64)
+		data->temp2_offset = 16000;
+
+	/* Initialize chip */
 	lm63_init_client(new_client);
 
 	/* Register sysfs hooks */