hwmon: (lm63) Add support for external temperature offset register

LM63 and compatibles support a temperature offset register for the external
temperature sensor. Add support for it.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 13 insertions, 3 deletions

diff --git a/drivers/hwmon/lm63.c b/drivers/hwmon/lm63.c
index e02d7f01b01b..313aee18be1d 100644
--- a/drivers/hwmon/lm63.c
+++ b/drivers/hwmon/lm63.c
@@ -180,9 +180,10 @@ struct lm63_data {
         s8 temp8[3];    /* 0: local input
                            1: local high limit
                            2: remote critical limit */
-        s16 temp11[3];  /* 0: remote input
+        s16 temp11[4];  /* 0: remote input
                            1: remote low limit
-                           2: remote high limit */
+                           2: remote high limit
+                           3: remote offset */
         u8 temp2_crit_hyst;
         u8 alarms;
 };
@@ -318,11 +319,13 @@ static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
                           const char *buf, size_t count)
 {
-        static const u8 reg[4] = {
+        static const u8 reg[6] = {
                 LM63_REG_REMOTE_LOW_MSB,
                 LM63_REG_REMOTE_LOW_LSB,
                 LM63_REG_REMOTE_HIGH_MSB,
                 LM63_REG_REMOTE_HIGH_LSB,
+                LM63_REG_REMOTE_OFFSET_MSB,
+                LM63_REG_REMOTE_OFFSET_LSB,
         };
 
         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
@@ -418,6 +421,8 @@ 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_offset, S_IWUSR | S_IRUGO, show_temp11,
+        set_temp11, 3);
 /*
  * On LM63, temp2_crit can be set only once, which should be job
  * of the bootloader.
@@ -445,6 +450,7 @@ static struct attribute *lm63_attributes[] = {
         &sensor_dev_attr_temp2_min.dev_attr.attr,
         &sensor_dev_attr_temp1_max.dev_attr.attr,
         &sensor_dev_attr_temp2_max.dev_attr.attr,
+        &sensor_dev_attr_temp2_offset.dev_attr.attr,
         &sensor_dev_attr_temp2_crit.dev_attr.attr,
         &dev_attr_temp2_crit_hyst.attr,
 
@@ -668,6 +674,10 @@ static struct lm63_data *lm63_update_device(struct device *dev)
                                   LM63_REG_REMOTE_HIGH_MSB) << 8)
                                 | i2c_smbus_read_byte_data(client,
                                   LM63_REG_REMOTE_HIGH_LSB);
+                data->temp11[3] = (i2c_smbus_read_byte_data(client,
+                                  LM63_REG_REMOTE_OFFSET_MSB) << 8)
+                                | i2c_smbus_read_byte_data(client,
+                                  LM63_REG_REMOTE_OFFSET_LSB);
                 data->temp8[2] = i2c_smbus_read_byte_data(client,
                                  LM63_REG_REMOTE_TCRIT);
                 data->temp2_crit_hyst = i2c_smbus_read_byte_data(client,