On LM96163, the external temperature sensor type is configurable to
either a thermal diode or a 3904 transistor. The chip reports a wrong
temperature if misconfigured. Add writable attribute to support it.
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v2:
- snprintf -> sprintf
- set temp sensor type to 1(CPU diode) instead of 3 (thermal diode) if trutherm
is enabled
- return error code from kstrtoul()
- When configuring the diode type, only set trutherm enable bit
- When detecting configured diode type, only check trutherm enable bit
- Document that configuring the thermal sensor type is supported for LM96163
drivers/hwmon/lm63.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/drivers/hwmon/lm63.c b/drivers/hwmon/lm63.c
index 5f6da52..4aedcdf 100644
--- a/drivers/hwmon/lm63.c
+++ b/drivers/hwmon/lm63.c
@@ -93,6 +93,7 @@ static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };
#define LM63_REG_MAN_ID 0xFE
#define LM63_REG_CHIP_ID 0xFF
+#define LM96163_REG_TRUTHERM 0x30
#define LM96163_REG_REMOTE_TEMP_U_MSB 0x31
#define LM96163_REG_REMOTE_TEMP_U_LSB 0x32
#define LM96163_REG_CONFIG_ENHANCED 0x45
@@ -213,6 +214,7 @@ struct lm63_data {
u8 alarms;
bool pwm_highres;
bool remote_unsigned; /* true if unsigned remote upper limits */
+ bool trutherm;
};
static inline int temp8_from_reg(struct lm63_data *data, int nr)
@@ -513,6 +515,41 @@ static ssize_t set_update_interval(struct device *dev,
return count;
}
+static ssize_t show_type(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm63_data *data = i2c_get_clientdata(client);
+
+ return sprintf(buf, data->trutherm ? "1\n" : "2\n");
+}
+
+static ssize_t set_type(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm63_data *data = i2c_get_clientdata(client);
+ unsigned long val;
+ int ret;
+ u8 reg;
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret < 0)
+ return ret;
+ if (val != 1 && val != 2)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+ data->trutherm = val == 1;
+ reg = i2c_smbus_read_byte_data(client, LM96163_REG_TRUTHERM) & ~0x02;
+ i2c_smbus_write_byte_data(client, LM96163_REG_TRUTHERM,
+ reg | data->trutherm ? 0x02 : 0x00);
+ data->valid = 0;
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
char *buf)
{
@@ -553,6 +590,8 @@ static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_remote_temp8,
static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst,
set_temp2_crit_hyst);
+static DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type);
+
/* Individual alarm files */
static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
@@ -712,6 +751,12 @@ static int lm63_probe(struct i2c_client *new_client,
if (err)
goto exit_remove_files;
}
+ if (data->kind == lm96163) {
+ err = device_create_file(&new_client->dev,
+ &dev_attr_temp2_type);
+ if (err)
+ goto exit_remove_files;
+ }
data->hwmon_dev = hwmon_device_register(&new_client->dev);
if (IS_ERR(data->hwmon_dev)) {
@@ -722,6 +767,7 @@ static int lm63_probe(struct i2c_client *new_client,
return 0;
exit_remove_files:
+ device_remove_file(&new_client->dev, &dev_attr_temp2_type);
sysfs_remove_group(&new_client->dev.kobj, &lm63_group);
sysfs_remove_group(&new_client->dev.kobj, &lm63_group_fan1);
exit_free:
@@ -763,6 +809,9 @@ static void lm63_init_client(struct i2c_client *client)
break;
case lm96163:
data->max_convrate_hz = LM96163_MAX_CONVRATE_HZ;
+ data->trutherm
+ = i2c_smbus_read_byte_data(client,
+ LM96163_REG_TRUTHERM) & 0x02;
break;
}
convrate = i2c_smbus_read_byte_data(client, LM63_REG_CONVRATE);
@@ -803,6 +852,7 @@ static int lm63_remove(struct i2c_client *client)
struct lm63_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
+ device_remove_file(&client->dev, &dev_attr_temp2_type);
sysfs_remove_group(&client->dev.kobj, &lm63_group);
sysfs_remove_group(&client->dev.kobj, &lm63_group_fan1);
--
1.7.5.4
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