hwmon: lm75: expose to thermal fw via DT nodes

[firefly-linux-kernel-4.4.55.git] / drivers / hwmon / lm75.c

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 7e3ef134f1d2ec0f0132e705cce2f8b586bf487d..84a55eacd9034a3ecb470c00a6382007e9a0f779 100644 (file)
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -27,6 +27,8 @@
 #include <linux/hwmon-sysfs.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/thermal.h>
 #include "lm75.h"
 
 
@@ -71,6 +73,7 @@ static const u8 LM75_REG_TEMP[3] = {
 /* Each client has this additional data */
 struct lm75_data {
        struct device           *hwmon_dev;
+       struct thermal_zone_device      *tz;
        struct mutex            update_lock;
        u8                      orig_conf;
        u8                      resolution;     /* In bits, between 9 and 12 */
@@ -91,22 +94,36 @@ static struct lm75_data *lm75_update_device(struct device *dev);
 
 /*-----------------------------------------------------------------------*/
 
+static inline long lm75_reg_to_mc(s16 temp, u8 resolution)
+{
+       return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8);
+}
+
 /* sysfs attributes for hwmon */
 
+static int lm75_read_temp(void *dev, long *temp)
+{
+       struct lm75_data *data = lm75_update_device(dev);
+
+       if (IS_ERR(data))
+               return PTR_ERR(data);
+
+       *temp = lm75_reg_to_mc(data->temp[0], data->resolution);
+
+       return 0;
+}
+
 static ssize_t show_temp(struct device *dev, struct device_attribute *da,
                         char *buf)
 {
        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
        struct lm75_data *data = lm75_update_device(dev);
-       long temp;
 
        if (IS_ERR(data))
                return PTR_ERR(data);
 
-       temp = ((data->temp[attr->index] >> (16 - data->resolution)) * 1000)
-              >> (data->resolution - 8);
-
-       return sprintf(buf, "%ld\n", temp);
+       return sprintf(buf, "%ld\n", lm75_reg_to_mc(data->temp[attr->index],
+                                                   data->resolution));
 }
 
 static ssize_t set_temp(struct device *dev, struct device_attribute *da,
@@ -273,6 +290,13 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
                goto exit_remove;
        }
 
+       data->tz = thermal_zone_of_sensor_register(&client->dev,
+                                                  0,
+                                                  &client->dev,
+                                                  lm75_read_temp, NULL);
+       if (IS_ERR(data->tz))
+               data->tz = NULL;
+
        dev_info(&client->dev, "%s: sensor '%s'\n",
                 dev_name(data->hwmon_dev), client->name);
 
@@ -287,6 +311,7 @@ static int lm75_remove(struct i2c_client *client)
 {
        struct lm75_data *data = i2c_get_clientdata(client);
 
+       thermal_zone_of_sensor_unregister(&client->dev, data->tz);
        hwmon_device_unregister(data->hwmon_dev);
        sysfs_remove_group(&client->dev.kobj, &lm75_group);
        lm75_write_value(client, LM75_REG_CONF, data->orig_conf);