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hwmon: tmp102: expose to thermal fw via DT nodes

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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.

Note: This patch has also been reviewed by Jean D. He has
requested to perform a wider inspection of possible
users of thermal and hwmon interaction API. On the other
hand, the change on this patch is acceptable on first
step of overall code change.

Cc: Jean Delvare <khali@linux-fr.org>
Cc: lm-sensors@lm-sensors.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
This commit is contained in:
Eduardo Valentin 2013-07-16 14:57:51 -04:00
parent 22e731838b
commit 6a027523f3
1 changed files with 19 additions and 0 deletions
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19
drivers/hwmon/tmp102.c
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@ -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, 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)
@ -204,6 +216,12 @@ static int tmp102_probe(struct i2c_client *client,
goto fail_remove_sysfs;
}
tmp102->tz = thermal_zone_of_sensor_register(&client->dev, 0,
&client->dev,
tmp102_read_temp, NULL);
if (IS_ERR(tmp102->tz))
tmp102->tz = NULL;
dev_info(&client->dev, "initialized\n");
return 0;
@ -220,6 +238,7 @@ static int tmp102_remove(struct i2c_client *client)
{
struct tmp102 *tmp102 = i2c_get_clientdata(client);
thermal_zone_of_sensor_unregister(&client->dev, tmp102->tz);
hwmon_device_unregister(tmp102->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group);