diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hwmon/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/hwmon/lm75.c | 92 |
2 files changed, 86 insertions, 8 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 9c333d47143..0428e8a74b1 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -630,7 +630,7 @@ config SENSORS_LM75 temperature sensor chip, with models including: - Analog Devices ADT75 - - Dallas Semiconductor DS75 and DS1775 + - Dallas Semiconductor DS75, DS1775 and DS7505 - Maxim MAX6625 and MAX6626 - Microchip MCP980x - National Semiconductor LM75, LM75A diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index 291edfff55b..c03b490bba8 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -38,6 +38,7 @@ enum lm75_type { /* keep sorted in alphabetical order */ adt75, ds1775, ds75, + ds7505, lm75, lm75a, max6625, @@ -71,9 +72,12 @@ struct lm75_data { struct device *hwmon_dev; struct mutex update_lock; u8 orig_conf; + u8 resolution; /* In bits, between 9 and 12 */ + u8 resolution_limits; char valid; /* !=0 if registers are valid */ unsigned long last_updated; /* In jiffies */ - u16 temp[3]; /* Register values, + unsigned long sample_time; /* In jiffies */ + s16 temp[3]; /* Register values, 0 = input 1 = max 2 = hyst */ @@ -93,12 +97,15 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *da, { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct lm75_data *data = lm75_update_device(dev); + long temp; if (IS_ERR(data)) return PTR_ERR(data); - return sprintf(buf, "%d\n", - LM75_TEMP_FROM_REG(data->temp[attr->index])); + temp = ((data->temp[attr->index] >> (16 - data->resolution)) * 1000) + >> (data->resolution - 8); + + return sprintf(buf, "%ld\n", temp); } static ssize_t set_temp(struct device *dev, struct device_attribute *da, @@ -110,13 +117,25 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *da, int nr = attr->index; long temp; int error; + u8 resolution; error = kstrtol(buf, 10, &temp); if (error) return error; + /* + * Resolution of limit registers is assumed to be the same as the + * temperature input register resolution unless given explicitly. + */ + if (attr->index && data->resolution_limits) + resolution = data->resolution_limits; + else + resolution = data->resolution; + mutex_lock(&data->update_lock); - data->temp[nr] = LM75_TEMP_TO_REG(temp); + temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); + data->temp[nr] = DIV_ROUND_CLOSEST(temp << (resolution - 8), + 1000) << (16 - resolution); lm75_write_value(client, LM75_REG_TEMP[nr], data->temp[nr]); mutex_unlock(&data->update_lock); return count; @@ -151,6 +170,7 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) int status; u8 set_mask, clr_mask; int new; + enum lm75_type kind = id->driver_data; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) @@ -167,8 +187,65 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) * Then tweak to be more precise when appropriate. */ set_mask = 0; - clr_mask = (1 << 0) /* continuous conversions */ - | (1 << 6) | (1 << 5); /* 9-bit mode */ + clr_mask = LM75_SHUTDOWN; /* continuous conversions */ + + switch (kind) { + case adt75: + clr_mask |= 1 << 5; /* not one-shot mode */ + data->resolution = 12; + data->sample_time = HZ / 8; + break; + case ds1775: + case ds75: + case stds75: + clr_mask |= 3 << 5; + set_mask |= 2 << 5; /* 11-bit mode */ + data->resolution = 11; + data->sample_time = HZ; + break; + case ds7505: + set_mask |= 3 << 5; /* 12-bit mode */ + data->resolution = 12; + data->sample_time = HZ / 4; + break; + case lm75: + case lm75a: + data->resolution = 9; + data->sample_time = HZ / 2; + break; + case max6625: + data->resolution = 9; + data->sample_time = HZ / 4; + break; + case max6626: + data->resolution = 12; + data->resolution_limits = 9; + data->sample_time = HZ / 4; + break; + case tcn75: + data->resolution = 9; + data->sample_time = HZ / 8; + break; + case mcp980x: + data->resolution_limits = 9; + /* fall through */ + case tmp100: + case tmp101: + set_mask |= 3 << 5; /* 12-bit mode */ + data->resolution = 12; + data->sample_time = HZ; + clr_mask |= 1 << 7; /* not one-shot mode */ + break; + case tmp105: + case tmp175: + case tmp275: + case tmp75: + set_mask |= 3 << 5; /* 12-bit mode */ + clr_mask |= 1 << 7; /* not one-shot mode */ + data->resolution = 12; + data->sample_time = HZ / 2; + break; + } /* configure as specified */ status = lm75_read_value(client, LM75_REG_CONF); @@ -218,6 +295,7 @@ static const struct i2c_device_id lm75_ids[] = { { "adt75", adt75, }, { "ds1775", ds1775, }, { "ds75", ds75, }, + { "ds7505", ds7505, }, { "lm75", lm75, }, { "lm75a", lm75a, }, { "max6625", max6625, }, @@ -407,7 +485,7 @@ static struct lm75_data *lm75_update_device(struct device *dev) mutex_lock(&data->update_lock); - if (time_after(jiffies, data->last_updated + HZ + HZ / 2) + if (time_after(jiffies, data->last_updated + data->sample_time) || !data->valid) { int i; dev_dbg(&client->dev, "Starting lm75 update\n"); |