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drivers/hwmon/adm1021.c: support high precision ADM1023 remote sensor 

The ADM1023 temperature sensor supports higher resolution for its external
sensor (sensitivity of 1/8 deg C).  This patch makes this higher
resolution available through the appropriate temperature sysfs nodes.

Curiously, this functionality was available in the 2.4 kernel driver (but
formatted in a less helpful manner).

Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Michael Abbott <michael.abbott@diamond.ac.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Abbott 2009-09-21 17:04:46 -07:00 committed by Linus Torvalds
parent dc791f8aee
commit f266889517
1 changed files with 23 additions and 24 deletions
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47
drivers/hwmon/adm1021.c
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@ -85,14 +85,11 @@ struct adm1021_data {
char valid; /* !=0 if following fields are valid */
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 +138,7 @@ 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 +147,7 @@ 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 +156,7 @@ 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,
@ -412,25 +409,27 @@ 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);