thermal: Add a thermal zone id accessor

In order to get the thermal zone id but without directly accessing the
thermal zone device structure, add an accessor.

Use the accessor in the hwmon_scmi and acpi_thermal.

No functional change intented.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/thermal.c

@@ -842,7 +842,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 		goto acpi_bus_detach;
 
 	dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
-		 tz->thermal_zone->id);
+		 thermal_zone_device_id(tz->thermal_zone));
 
 	return 0;
 

drivers/hwmon/scmi-hwmon.c

@@ -220,7 +220,7 @@ static int scmi_thermal_sensor_register(struct device *dev,
 			sensor->name);
 	} else {
 		dev_dbg(dev, "Sensor '%s' attached to thermal zone ID:%d\n",
-			sensor->name, tzd->id);
+			sensor->name, thermal_zone_device_id(tzd));
 	}
 
 	return 0;

drivers/thermal/thermal_core.c

@@ -1389,6 +1389,12 @@ const char *thermal_zone_device_type(struct thermal_zone_device *tzd)
 }
 EXPORT_SYMBOL_GPL(thermal_zone_device_type);
 
+int thermal_zone_device_id(struct thermal_zone_device *tzd)
+{
+	return tzd->id;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_device_id);
+
 /**
  * thermal_zone_device_unregister - removes the registered thermal zone device
  * @tz: the thermal zone device to remove

include/linux/thermal.h

@@ -367,6 +367,7 @@ thermal_zone_device_register_with_trips(const char *, struct thermal_trip *, int
 
 void *thermal_zone_device_priv(struct thermal_zone_device *tzd);
 const char *thermal_zone_device_type(struct thermal_zone_device *tzd);
+int thermal_zone_device_id(struct thermal_zone_device *tzd);
 
 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 				     struct thermal_cooling_device *,
@@ -449,6 +450,11 @@ static inline const char *thermal_zone_device_type(struct thermal_zone_device *t
 	return NULL;
 }
 
+static inline int thermal_zone_device_id(struct thermal_zone_device *tzd)
+{
+	return -ENODEV;
+}
+
 static inline int thermal_zone_device_enable(struct thermal_zone_device *tz)
 { return -ENODEV; }