This patch adds to tmp102 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 tmp102 DT node. Otherwise, the driver behavior
will be the same.
Cc: Jean Delvare <khali@xxxxxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: lm-sensors@xxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Eduardo Valentin <eduardo.valentin@xxxxxx>
---
drivers/hwmon/tmp102.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c
index d7b47ab..621093b 100644
--- a/drivers/hwmon/tmp102.c
+++ b/drivers/hwmon/tmp102.c
@@ -27,6 +27,8 @@
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/jiffies.h>
+#include <linux/thermal.h>
+#include <linux/of.h>
#define DRIVER_NAME "tmp102"
@@ -50,6 +52,7 @@
struct tmp102 {
struct device *hwmon_dev;
+ struct thermal_zone_device *tz;
struct mutex lock;
u16 config_orig;
unsigned long last_update;
@@ -93,6 +96,15 @@ static struct tmp102 *tmp102_update_device(struct i2c_client *client)
return tmp102;
}
+static int tmp102_read_temp(void *dev, unsigned long *temp)
+{
+ struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev));
+
+ *temp = tmp102->temp[0];
+
+ return 0;
+}
+
static ssize_t tmp102_show_temp(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -204,10 +216,22 @@ static int tmp102_probe(struct i2c_client *client,
goto fail_remove_sysfs;
}
+ if (of_find_node_by_name(client->dev.of_node, "thermal_zone")) {
+ tmp102->tz = thermal_zone_of_device_register(&client->dev,
+ &client->dev,
+ tmp102_read_temp);
+ if (IS_ERR(tmp102->tz)) {
+ status = PTR_ERR(tmp102->tz);
+ goto exit_hwmon;
+ }
+ }
+
dev_info(&client->dev, "initialized\n");
return 0;
+exit_hwmon:
+ hwmon_device_unregister(tmp102->hwmon_dev);
fail_remove_sysfs:
sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
fail_restore_config:
@@ -220,6 +244,7 @@ static int tmp102_remove(struct i2c_client *client)
{
struct tmp102 *tmp102 = i2c_get_clientdata(client);
+ thermal_zone_device_unregister(tmp102->tz);
hwmon_device_unregister(tmp102->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);
--
1.8.2.1.342.gfa7285d
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