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hwmon: (lm90) Convert some macros to static functions
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Use static functions instead of the TEMPx_FROM_REG* and TEMPx_TO_REG*
macros.  This will ensure type safety and eliminate any side effects
from arguments passed in since the macros referenced 'val' multiple
times.  This change should not affect functionality.

Signed-off-by: Nate Case <ncase@xes-inc.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Tested-by: Martyn Welch <martyn.welch@gefanuc.com>
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Nate Case authored and Jean Delvare committed Oct 17, 2008
1 parent a874a10 commit cea50fe
Showing 1 changed file with 83 additions and 45 deletions.
128 changes: 83 additions & 45 deletions drivers/hwmon/lm90.c
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Original file line number Diff line number Diff line change
Expand Up @@ -137,40 +137,6 @@ I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680);

#define MAX6657_REG_R_LOCAL_TEMPL 0x11

/*
* Conversions and various macros
* For local temperatures and limits, critical limits and the hysteresis
* value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
* For remote temperatures and limits, it uses signed 11-bit values with
* LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
*/

#define TEMP1_FROM_REG(val) ((val) * 1000)
#define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \
(val) >= 127000 ? 127 : \
(val) < 0 ? ((val) - 500) / 1000 : \
((val) + 500) / 1000)
#define TEMP2_FROM_REG(val) ((val) / 32 * 125)
#define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \
(val) >= 127875 ? 0x7FE0 : \
(val) < 0 ? ((val) - 62) / 125 * 32 : \
((val) + 62) / 125 * 32)
#define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \
((val) + 500) / 1000)

/*
* ADT7461 is almost identical to LM90 except that attempts to write
* values that are outside the range 0 < temp < 127 are treated as
* the boundary value.
*/

#define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
(val) >= 127000 ? 127 : \
((val) + 500) / 1000)
#define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
(val) >= 127750 ? 0x7FC0 : \
((val) + 125) / 250 * 64)

/*
* Functions declaration
*/
Expand Down Expand Up @@ -240,6 +206,78 @@ struct lm90_data {
u8 alarms; /* bitvector */
};

/*
* Conversions
* For local temperatures and limits, critical limits and the hysteresis
* value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
* For remote temperatures and limits, it uses signed 11-bit values with
* LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
*/

static inline int temp1_from_reg(s8 val)
{
return val * 1000;
}

static inline int temp2_from_reg(s16 val)
{
return val / 32 * 125;
}

static s8 temp1_to_reg(long val)
{
if (val <= -128000)
return -128;
if (val >= 127000)
return 127;
if (val < 0)
return (val - 500) / 1000;
return (val + 500) / 1000;
}

static s16 temp2_to_reg(long val)
{
if (val <= -128000)
return 0x8000;
if (val >= 127875)
return 0x7FE0;
if (val < 0)
return (val - 62) / 125 * 32;
return (val + 62) / 125 * 32;
}

static u8 hyst_to_reg(long val)
{
if (val <= 0)
return 0;
if (val >= 30500)
return 31;
return (val + 500) / 1000;
}

/*
* ADT7461 is almost identical to LM90 except that attempts to write
* values that are outside the range 0 < temp < 127 are treated as
* the boundary value.
*/
static u8 temp1_to_reg_adt7461(long val)
{
if (val <= 0)
return 0;
if (val >= 127000)
return 127;
return (val + 500) / 1000;
}

static u16 temp2_to_reg_adt7461(long val)
{
if (val <= 0)
return 0;
if (val >= 127750)
return 0x7FC0;
return (val + 125) / 250 * 64;
}

/*
* Sysfs stuff
*/
Expand All @@ -249,7 +287,7 @@ static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm90_data *data = lm90_update_device(dev);
return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]));
return sprintf(buf, "%d\n", temp1_from_reg(data->temp8[attr->index]));
}

static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
Expand All @@ -270,9 +308,9 @@ static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,

mutex_lock(&data->update_lock);
if (data->kind == adt7461)
data->temp8[nr] = TEMP1_TO_REG_ADT7461(val);
data->temp8[nr] = temp1_to_reg_adt7461(val);
else
data->temp8[nr] = TEMP1_TO_REG(val);
data->temp8[nr] = temp1_to_reg(val);
i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]);
mutex_unlock(&data->update_lock);
return count;
Expand All @@ -283,7 +321,7 @@ static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm90_data *data = lm90_update_device(dev);
return sprintf(buf, "%d\n", TEMP2_FROM_REG(data->temp11[attr->index]));
return sprintf(buf, "%d\n", temp2_from_reg(data->temp11[attr->index]));
}

static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
Expand All @@ -306,11 +344,11 @@ static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,

mutex_lock(&data->update_lock);
if (data->kind == adt7461)
data->temp11[nr] = TEMP2_TO_REG_ADT7461(val);
data->temp11[nr] = temp2_to_reg_adt7461(val);
else if (data->kind == max6657 || data->kind == max6680)
data->temp11[nr] = TEMP1_TO_REG(val) << 8;
data->temp11[nr] = temp1_to_reg(val) << 8;
else
data->temp11[nr] = TEMP2_TO_REG(val);
data->temp11[nr] = temp2_to_reg(val);

i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
data->temp11[nr] >> 8);
Expand All @@ -326,8 +364,8 @@ static ssize_t show_temphyst(struct device *dev, struct device_attribute *devatt
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm90_data *data = lm90_update_device(dev);
return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index])
- TEMP1_FROM_REG(data->temp_hyst));
return sprintf(buf, "%d\n", temp1_from_reg(data->temp8[attr->index])
- temp1_from_reg(data->temp_hyst));
}

static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
Expand All @@ -339,9 +377,9 @@ static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
long hyst;

mutex_lock(&data->update_lock);
hyst = TEMP1_FROM_REG(data->temp8[2]) - val;
hyst = temp1_from_reg(data->temp8[2]) - val;
i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
HYST_TO_REG(hyst));
hyst_to_reg(hyst));
mutex_unlock(&data->update_lock);
return count;
}
Expand Down

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