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authorJean Delvare <khali@linux-fr.org>2011-10-20 03:13:31 -0400
committerGuenter Roeck <guenter.roeck@ericsson.com>2011-10-24 11:09:48 -0700
commitc5794cfac09a585945e1632451900594db19393b (patch)
tree64a01f41edbcbbcbb8c22f271c02a57c538fbf04 /drivers/hwmon
parent17296feb3c666d0fee3e659e9b5d668ff7a02549 (diff)
hwmon: (w83627ehf) Better fix for negative temperature values
It is more efficient to left-align 8-bit temperature values, so that 8-bit and 9-bit temperature values can be handled exactly the same way in the rest of the code. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Guenter Roeck <guenter.roeck@ericsson.com> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/w83627ehf.c51
1 files changed, 26 insertions, 25 deletions
diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index a26830dfea7..98aab4bea34 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -388,23 +388,6 @@ div_from_reg(u8 reg)
return 1 << reg;
}
-static inline int
-temp_from_reg(u16 reg, s16 regval)
-{
- if (is_word_sized(reg))
- return LM75_TEMP_FROM_REG(regval);
- return ((s8)regval) * 1000;
-}
-
-static inline u16
-temp_to_reg(u16 reg, long temp)
-{
- if (is_word_sized(reg))
- return LM75_TEMP_TO_REG(temp);
- return (s8)DIV_ROUND_CLOSEST(SENSORS_LIMIT(temp, -127000, 128000),
- 1000);
-}
-
/* Some of analog inputs have internal scaling (2x), 8mV is ADC LSB */
static u8 scale_in[10] = { 8, 8, 16, 16, 8, 8, 8, 16, 16, 8 };
@@ -561,6 +544,26 @@ static int w83627ehf_write_value(struct w83627ehf_data *data, u16 reg,
return 0;
}
+/* We left-align 8-bit temperature values to make the code simpler */
+static u16 w83627ehf_read_temp(struct w83627ehf_data *data, u16 reg)
+{
+ u16 res;
+
+ res = w83627ehf_read_value(data, reg);
+ if (!is_word_sized(reg))
+ res <<= 8;
+
+ return res;
+}
+
+static int w83627ehf_write_temp(struct w83627ehf_data *data, u16 reg,
+ u16 value)
+{
+ if (!is_word_sized(reg))
+ value >>= 8;
+ return w83627ehf_write_value(data, reg, value);
+}
+
/* This function assumes that the caller holds data->update_lock */
static void nct6775_write_fan_div(struct w83627ehf_data *data, int nr)
{
@@ -862,15 +865,15 @@ static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
for (i = 0; i < NUM_REG_TEMP; i++) {
if (!(data->have_temp & (1 << i)))
continue;
- data->temp[i] = w83627ehf_read_value(data,
+ data->temp[i] = w83627ehf_read_temp(data,
data->reg_temp[i]);
if (data->reg_temp_over[i])
data->temp_max[i]
- = w83627ehf_read_value(data,
+ = w83627ehf_read_temp(data,
data->reg_temp_over[i]);
if (data->reg_temp_hyst[i])
data->temp_max_hyst[i]
- = w83627ehf_read_value(data,
+ = w83627ehf_read_temp(data,
data->reg_temp_hyst[i]);
}
@@ -1166,8 +1169,7 @@ show_##reg(struct device *dev, struct device_attribute *attr, \
struct sensor_device_attribute *sensor_attr = \
to_sensor_dev_attr(attr); \
int nr = sensor_attr->index; \
- return sprintf(buf, "%d\n", \
- temp_from_reg(data->addr[nr], data->reg[nr])); \
+ return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->reg[nr])); \
}
show_temp_reg(reg_temp, temp);
show_temp_reg(reg_temp_over, temp_max);
@@ -1188,9 +1190,8 @@ store_##reg(struct device *dev, struct device_attribute *attr, \
if (err < 0) \
return err; \
mutex_lock(&data->update_lock); \
- data->reg[nr] = temp_to_reg(data->addr[nr], val); \
- w83627ehf_write_value(data, data->addr[nr], \
- data->reg[nr]); \
+ data->reg[nr] = LM75_TEMP_TO_REG(val); \
+ w83627ehf_write_temp(data, data->addr[nr], data->reg[nr]); \
mutex_unlock(&data->update_lock); \
return count; \
}