diff options
Diffstat (limited to 'drivers/hwmon/lm90.c')
| -rw-r--r-- | drivers/hwmon/lm90.c | 128 |
1 files changed, 83 insertions, 45 deletions
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c index d96e403d59e..b2d9b3f0946 100644 --- a/drivers/hwmon/lm90.c +++ b/drivers/hwmon/lm90.c @@ -138,40 +138,6 @@ 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 */ @@ -241,6 +207,78 @@ struct lm90_data { }; /* + * 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 */ @@ -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, @@ -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; @@ -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, @@ -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); @@ -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, @@ -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; } |