aboutsummaryrefslogtreecommitdiff
path: root/drivers/hwmon/lm90.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/hwmon/lm90.c')
-rw-r--r--drivers/hwmon/lm90.c29
1 files changed, 25 insertions, 4 deletions
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 98b53b119c2..960df9fa75a 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -41,7 +41,8 @@
* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
* Note that there is no easy way to differentiate between the three
* variants. The extra address and features of the MAX6659 are not
- * supported by this driver.
+ * supported by this driver. These chips lack the remote temperature
+ * offset feature.
*
* This driver also supports the MAX6680 and MAX6681, two other sensor
* chips made by Maxim. These are quite similar to the other Maxim
@@ -226,9 +227,10 @@ struct lm90_data {
2: local high limit
3: local critical limit
4: remote critical limit */
- s16 temp11[3]; /* 0: remote input
+ s16 temp11[4]; /* 0: remote input
1: remote low limit
- 2: remote high limit */
+ 2: remote high limit
+ 3: remote offset (except max6657) */
u8 temp_hyst;
u8 alarms; /* bitvector */
};
@@ -282,11 +284,13 @@ static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
- static const u8 reg[4] = {
+ static const u8 reg[6] = {
LM90_REG_W_REMOTE_LOWH,
LM90_REG_W_REMOTE_LOWL,
LM90_REG_W_REMOTE_HIGHH,
LM90_REG_W_REMOTE_HIGHL,
+ LM90_REG_W_REMOTE_OFFSH,
+ LM90_REG_W_REMOTE_OFFSL,
};
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
@@ -367,6 +371,8 @@ static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
set_temphyst, 3);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
+ set_temp11, 3);
/* Individual alarm files */
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
@@ -652,6 +658,11 @@ static int lm90_detect(struct i2c_adapter *adapter, int address, int kind)
&dev_attr_pec)))
goto exit_remove_files;
}
+ if (data->kind != max6657) {
+ if ((err = device_create_file(&new_client->dev,
+ &sensor_dev_attr_temp2_offset.dev_attr)))
+ goto exit_remove_files;
+ }
data->hwmon_dev = hwmon_device_register(&new_client->dev);
if (IS_ERR(data->hwmon_dev)) {
@@ -710,6 +721,9 @@ static int lm90_detach_client(struct i2c_client *client)
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &lm90_group);
device_remove_file(&client->dev, &dev_attr_pec);
+ if (data->kind != max6657)
+ device_remove_file(&client->dev,
+ &sensor_dev_attr_temp2_offset.dev_attr);
if ((err = i2c_detach_client(client)))
return err;
@@ -763,6 +777,13 @@ static struct lm90_data *lm90_update_device(struct device *dev)
if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &newh) == 0
&& lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0)
data->temp11[2] = (newh << 8) | l;
+ if (data->kind != max6657) {
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
+ &newh) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
+ &l) == 0)
+ data->temp11[3] = (newh << 8) | l;
+ }
lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
data->last_updated = jiffies;