diff options
Diffstat (limited to 'drivers/hwmon/adm1021.c')
| -rw-r--r-- | drivers/hwmon/adm1021.c | 79 |
1 files changed, 55 insertions, 24 deletions
diff --git a/drivers/hwmon/adm1021.c b/drivers/hwmon/adm1021.c index b11e06f644b1..afc594318125 100644 --- a/drivers/hwmon/adm1021.c +++ b/drivers/hwmon/adm1021.c @@ -83,16 +83,14 @@ struct adm1021_data { struct mutex update_lock; char valid; /* !=0 if following fields are valid */ + char low_power; /* !=0 if device in low power mode */ unsigned long last_updated; /* In jiffies */ - s8 temp_max[2]; /* Register values */ - s8 temp_min[2]; - s8 temp[2]; + int temp_max[2]; /* Register values */ + int temp_min[2]; + int temp[2]; u8 alarms; /* Special values for ADM1023 only */ - u8 remote_temp_prec; - u8 remote_temp_os_prec; - u8 remote_temp_hyst_prec; u8 remote_temp_offset; u8 remote_temp_offset_prec; }; @@ -141,7 +139,7 @@ static ssize_t show_temp(struct device *dev, int index = to_sensor_dev_attr(devattr)->index; struct adm1021_data *data = adm1021_update_device(dev); - return sprintf(buf, "%d\n", 1000 * data->temp[index]); + return sprintf(buf, "%d\n", data->temp[index]); } static ssize_t show_temp_max(struct device *dev, @@ -150,7 +148,7 @@ static ssize_t show_temp_max(struct device *dev, int index = to_sensor_dev_attr(devattr)->index; struct adm1021_data *data = adm1021_update_device(dev); - return sprintf(buf, "%d\n", 1000 * data->temp_max[index]); + return sprintf(buf, "%d\n", data->temp_max[index]); } static ssize_t show_temp_min(struct device *dev, @@ -159,7 +157,7 @@ static ssize_t show_temp_min(struct device *dev, int index = to_sensor_dev_attr(devattr)->index; struct adm1021_data *data = adm1021_update_device(dev); - return sprintf(buf, "%d\n", 1000 * data->temp_min[index]); + return sprintf(buf, "%d\n", data->temp_min[index]); } static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, @@ -216,6 +214,35 @@ static ssize_t set_temp_min(struct device *dev, return count; } +static ssize_t show_low_power(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct adm1021_data *data = adm1021_update_device(dev); + return sprintf(buf, "%d\n", data->low_power); +} + +static ssize_t set_low_power(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct adm1021_data *data = i2c_get_clientdata(client); + int low_power = simple_strtol(buf, NULL, 10) != 0; + + mutex_lock(&data->update_lock); + if (low_power != data->low_power) { + int config = i2c_smbus_read_byte_data( + client, ADM1021_REG_CONFIG_R); + data->low_power = low_power; + i2c_smbus_write_byte_data(client, ADM1021_REG_CONFIG_W, + (config & 0xBF) | (low_power << 6)); + } + mutex_unlock(&data->update_lock); + + return count; +} + + static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max, 0); @@ -233,6 +260,7 @@ static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); +static DEVICE_ATTR(low_power, S_IWUSR | S_IRUGO, show_low_power, set_low_power); static struct attribute *adm1021_attributes[] = { &sensor_dev_attr_temp1_max.dev_attr.attr, @@ -247,6 +275,7 @@ static struct attribute *adm1021_attributes[] = { &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, &sensor_dev_attr_temp2_fault.dev_attr.attr, &dev_attr_alarms.attr, + &dev_attr_low_power.attr, NULL }; @@ -412,25 +441,27 @@ static struct adm1021_data *adm1021_update_device(struct device *dev) dev_dbg(&client->dev, "Starting adm1021 update\n"); for (i = 0; i < 2; i++) { - data->temp[i] = i2c_smbus_read_byte_data(client, - ADM1021_REG_TEMP(i)); - data->temp_max[i] = i2c_smbus_read_byte_data(client, - ADM1021_REG_TOS_R(i)); - data->temp_min[i] = i2c_smbus_read_byte_data(client, - ADM1021_REG_THYST_R(i)); + data->temp[i] = 1000 * + (s8) i2c_smbus_read_byte_data( + client, ADM1021_REG_TEMP(i)); + data->temp_max[i] = 1000 * + (s8) i2c_smbus_read_byte_data( + client, ADM1021_REG_TOS_R(i)); + data->temp_min[i] = 1000 * + (s8) i2c_smbus_read_byte_data( + client, ADM1021_REG_THYST_R(i)); } data->alarms = i2c_smbus_read_byte_data(client, ADM1021_REG_STATUS) & 0x7c; if (data->type == adm1023) { - data->remote_temp_prec = - i2c_smbus_read_byte_data(client, - ADM1023_REG_REM_TEMP_PREC); - data->remote_temp_os_prec = - i2c_smbus_read_byte_data(client, - ADM1023_REG_REM_TOS_PREC); - data->remote_temp_hyst_prec = - i2c_smbus_read_byte_data(client, - ADM1023_REG_REM_THYST_PREC); + /* The ADM1023 provides 3 extra bits of precision for + * the remote sensor in extra registers. */ + data->temp[1] += 125 * (i2c_smbus_read_byte_data( + client, ADM1023_REG_REM_TEMP_PREC) >> 5); + data->temp_max[1] += 125 * (i2c_smbus_read_byte_data( + client, ADM1023_REG_REM_TOS_PREC) >> 5); + data->temp_min[1] += 125 * (i2c_smbus_read_byte_data( + client, ADM1023_REG_REM_THYST_PREC) >> 5); data->remote_temp_offset = i2c_smbus_read_byte_data(client, ADM1023_REG_REM_OFFSET); |