hwmon: (w83795) Properly handle negative temperatures

The temperature registers hold regular 2's complement values, no need
to add any arithmetics.

Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 7 insertions, 13 deletions

diff --git a/drivers/hwmon/w83795.c b/drivers/hwmon/w83795.c
index 5ce276b6752..f4b7cb45ebc 100644
--- a/drivers/hwmon/w83795.c
+++ b/drivers/hwmon/w83795.c
@@ -295,7 +295,7 @@ static inline long temp_from_reg(s8 reg)
 
 static inline s8 temp_to_reg(long val, s8 min, s8 max)
 {
-        return SENSORS_LIMIT((val < 0 ? -val : val) / 1000, min, max);
+        return SENSORS_LIMIT(val / 1000, min, max);
 }
 
 static const u16 pwm_freq_cksel0[16] = {
@@ -364,7 +364,7 @@ struct w83795_data {
         u16 fan_min[14];        /* Register value combine */
 
         u8 has_temp;            /* Enable monitor temp6-1 or not */
-        u8 temp[6][5];          /* current, crit, crit_hyst, warn, warn_hyst */
+        s8 temp[6][5];          /* current, crit, crit_hyst, warn, warn_hyst */
         u8 temp_read_vrlsb[6];
         u8 temp_mode;           /* bit 0: TR mode, bit 1: TD mode */
         u8 temp_src[3];         /* Register value */
@@ -373,9 +373,9 @@ struct w83795_data {
                                  * bit 0: =1 enable, =0 disable,
                                  * bit 1: =1 AMD SB-TSI, =0 Intel PECI */
         u8 has_dts;             /* Enable monitor DTS temp */
-        u8 dts[8];              /* Register value */
+        s8 dts[8];              /* Register value */
         u8 dts_read_vrlsb[8];   /* Register value */
-        u8 dts_ext[4];          /* Register value */
+        s8 dts_ext[4];          /* Register value */
 
         u8 has_pwm;             /* 795g supports 8 pwm, 795adg only supports 2,
                                  * no config register, only affected by chip
@@ -1170,13 +1170,11 @@ show_temp(struct device *dev, struct device_attribute *attr, char *buf)
         int nr = sensor_attr->nr;
         int index = sensor_attr->index;
         struct w83795_data *data = w83795_update_device(dev);
-        long temp = temp_from_reg(data->temp[index][nr] & 0x7f);
+        long temp = temp_from_reg(data->temp[index][nr]);
 
         if (TEMP_READ == nr)
                 temp += ((data->temp_read_vrlsb[index] >> VRLSB_SHIFT) & 0x03)
                         * 250;
-        if (data->temp[index][nr] & 0x80)
-                temp = -temp;
         return sprintf(buf, "%ld\n", temp);
 }
 
@@ -1235,11 +1233,9 @@ show_dts(struct device *dev, struct device_attribute *attr, char *buf)
             to_sensor_dev_attr_2(attr);
         int index = sensor_attr->index;
         struct w83795_data *data = w83795_update_device(dev);
-        long temp = temp_from_reg(data->dts[index] & 0x7f);
+        long temp = temp_from_reg(data->dts[index]);
 
         temp += ((data->dts_read_vrlsb[index] >> VRLSB_SHIFT) & 0x03) * 250;
-        if (data->dts[index] & 0x80)
-                temp = -temp;
         return sprintf(buf, "%ld\n", temp);
 }
 
@@ -1251,10 +1247,8 @@ show_dts_ext(struct device *dev, struct device_attribute *attr, char *buf)
         int nr = sensor_attr->nr;
         struct i2c_client *client = to_i2c_client(dev);
         struct w83795_data *data = i2c_get_clientdata(client);
-        long temp = temp_from_reg(data->dts_ext[nr] & 0x7f);
+        long temp = temp_from_reg(data->dts_ext[nr]);
 
-        if (data->dts_ext[nr] & 0x80)
-                temp = -temp;
         return sprintf(buf, "%ld\n", temp);
 }