Add support for reading and writing the n-factor correction
registers. This is needed to compensate for the characteristics
of a particular sensor hanging off of the remote channels.
Signed-off-by: Jeff Angielski <j...@theptrgroup.com>
---
drivers/hwmon/tmp421.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 42 insertions(+), 0 deletions(-)
diff --git a/drivers/hwmon/tmp421.c b/drivers/hwmon/tmp421.c
index 738c472..c9e9855 100644
--- a/drivers/hwmon/tmp421.c
+++ b/drivers/hwmon/tmp421.c
@@ -49,6 +49,7 @@ enum chips { tmp421, tmp422, tmp423 };
static const u8 TMP421_TEMP_MSB[4] = { 0x00, 0x01, 0x02, 0x03 };
static const u8 TMP421_TEMP_LSB[4] = { 0x10, 0x11, 0x12, 0x13 };
+static const u8 TMP421_NFACTOR[3] = { 0x21, 0x22, 0x23 };
/* Flags */
#define TMP421_CONFIG_SHUTDOWN 0x40
@@ -157,6 +158,38 @@ static ssize_t show_fault(struct device *dev,
return sprintf(buf, "0\n");
}
+static ssize_t show_nfactor(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct tmp421_data *data = i2c_get_clientdata(client);
+ int index = to_sensor_dev_attr(devattr)->index;
+ s8 nfactor;
+
+ mutex_lock(&data->update_lock);
+ nfactor = i2c_smbus_read_byte_data(client, TMP421_NFACTOR[index-1]);
+ mutex_unlock(&data->update_lock);
+
+ return sprintf(buf, "%d\n", nfactor);
+}
+
+static ssize_t set_nfactor(struct device *dev,
+ struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct tmp421_data *data = i2c_get_clientdata(client);
+ int index = to_sensor_dev_attr(devattr)->index;
+ int nfactor = simple_strtol(buf, NULL, 10);
+
+ mutex_lock(&data->update_lock);
+ i2c_smbus_write_byte_data(client, TMP421_NFACTOR[index-1],
+ SENSORS_LIMIT(nfactor, -128, 127));
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
static mode_t tmp421_is_visible(struct kobject *kobj, struct attribute *a,
int n)
{
@@ -177,19 +210,28 @@ static mode_t tmp421_is_visible(struct kobject
*kobj, struct attribute *a,
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_value, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_value, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_fault, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_nfactor, S_IRUGO | S_IWUSR,
+ show_nfactor, set_nfactor, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_value, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_fault, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_nfactor, S_IRUGO | S_IWUSR,
+ show_nfactor, set_nfactor, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_value, NULL, 3);
static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_fault, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp4_nfactor, S_IRUGO | S_IWUSR,
+ show_nfactor, set_nfactor, 3);
static struct attribute *tmp421_attr[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
+ &sensor_dev_attr_temp2_nfactor.dev_attr.attr,
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
+ &sensor_dev_attr_temp3_nfactor.dev_attr.attr,
&sensor_dev_attr_temp4_input.dev_attr.attr,
&sensor_dev_attr_temp4_fault.dev_attr.attr,
+ &sensor_dev_attr_temp4_nfactor.dev_attr.attr,
NULL
};
--
1.7.0.4
--
Jeff Angielski
The PTR Group
www.theptrgroup.com
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