This patch adds to lm90 temperature sensor the possibility
to expose itself as thermal zone device, registered on the
thermal framework.
The thermal zone is built only if a device tree node
describing a thermal zone for this sensor is present
inside the lm90 DT node. Otherwise, the driver behavior
will be the same.
Change-Id: Ie263e8973ec45d057fddadd3042c7d3fefdf4acc
Signed-off-by: Wei Ni <w...@nvidia.com>
---
drivers/hwmon/lm90.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 58 insertions(+)
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index cb33dcf..2a385c5 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -96,6 +96,8 @@
#include <linux/sysfs.h>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.h>
+#include <linux/of.h>
+#include <linux/thermal.h>
/*
* Addresses to scan
@@ -119,6 +121,13 @@ static const unsigned short normal_i2c[] = {
enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
max6646, w83l771, max6696, sa56004, g781, tmp451 };
+enum sensor_id {
+ LOCAL = 0,
+ REMOTE,
+ REMOTE2,
+ SENSOR_ID_END,
+};
+
/*
* The LM90 registers
*/
@@ -368,6 +377,7 @@ struct lm90_data {
struct i2c_client *client;
struct device *hwmon_dev;
const struct attribute_group *groups[6];
+ struct thermal_zone_device *tz[SENSOR_ID_END];
struct mutex update_lock;
struct regulator *regulator;
char valid; /* zero until following fields are valid */
@@ -874,6 +884,24 @@ static ssize_t show_temp11(struct device *dev, struct
device_attribute *devattr,
return sprintf(buf, "%d\n", read_temp11(dev, attr->index));
}
+static int lm90_read_local_temp(void *dev, long *temp)
+{
+ *temp = read_temp11(dev, LOCAL_TEMP);
+ return 0;
+}
+
+static int lm90_read_remote_temp(void *dev, long *temp)
+{
+ *temp = read_temp11(dev, REMOTE_TEMP);
+ return 0;
+}
+
+static int lm90_read_remote2_temp(void *dev, long *temp)
+{
+ *temp = read_temp11(dev, REMOTE2_TEMP);
+ return 0;
+}
+
static int write_temp11(struct device *dev, int nr, int index, long val)
{
struct {
@@ -1653,6 +1681,33 @@ static int lm90_probe(struct i2c_client *client,
}
}
+ data->tz[LOCAL] = thermal_zone_of_sensor_register(&client->dev,
+ LOCAL,
+ &client->dev,
+ lm90_read_local_temp,
+ NULL);
+ if (IS_ERR(data->tz[LOCAL]))
+ data->tz[LOCAL] = NULL;
+
+ data->tz[REMOTE] = thermal_zone_of_sensor_register(&client->dev,
+ REMOTE,
+ &client->dev,
+ lm90_read_remote_temp,
+ NULL);
+ if (IS_ERR(data->tz[REMOTE]))
+ data->tz[REMOTE] = NULL;
+
+ if (data->flags & LM90_HAVE_TEMP3) {
+ data->tz[REMOTE2] = thermal_zone_of_sensor_register(
+ &client->dev,
+ REMOTE2,
+ &client->dev,
+ lm90_read_remote2_temp,
+ NULL);
+ if (IS_ERR(data->tz[REMOTE2]))
+ data->tz[REMOTE2] = NULL;
+ }
+
return 0;
exit_unregister:
@@ -1668,8 +1723,11 @@ exit_restore:
static int lm90_remove(struct i2c_client *client)
{
+ int i;
struct lm90_data *data = i2c_get_clientdata(client);
+ for (i = 0; i < SENSOR_ID_END; i++)
+ thermal_zone_of_sensor_unregister(&client->dev, data->tz[i]);
hwmon_device_unregister(data->hwmon_dev);
device_remove_file(&client->dev, &dev_attr_pec);
lm90_restore_conf(client, data);
--
1.7.9.5
--
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