thermal: Introduce dummy functions when thermal is not defined

When CONFIG_THERMAL is not enabled, it is better to introduce
equivalent dummy functions in the exported header than to
introduce #ifdeffery in drivers using the function.

This will prevent issues such as that reported in:
http://www.spinics.net/lists/linux-next/msg31573.html

While at it switch over to IS_ENABLED for thermal macros
to allow for thermal framework to be built as framework
and relevant APIs be usable by relevant drivers as a result.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

1 files changed, 54 insertions, 2 deletions

diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index fc52e307efab..5eac316490ea 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -314,6 +314,8 @@ void thermal_zone_of_sensor_unregister(struct device *dev,
 }
 
 #endif
+
+#if IS_ENABLED(CONFIG_THERMAL)
 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
                 void *, struct thermal_zone_device_ops *,
                 const struct thermal_zone_params *, int, int);
@@ -340,8 +342,58 @@ struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
                 struct thermal_cooling_device *, int);
 void thermal_cdev_update(struct thermal_cooling_device *);
 void thermal_notify_framework(struct thermal_zone_device *, int);
-
-#ifdef CONFIG_NET
+#else
+static inline struct thermal_zone_device *thermal_zone_device_register(
+        const char *type, int trips, int mask, void *devdata,
+        struct thermal_zone_device_ops *ops,
+        const struct thermal_zone_params *tzp,
+        int passive_delay, int polling_delay)
+{ return ERR_PTR(-ENODEV); }
+static inline void thermal_zone_device_unregister(
+        struct thermal_zone_device *tz)
+{ }
+static inline int thermal_zone_bind_cooling_device(
+        struct thermal_zone_device *tz, int trip,
+        struct thermal_cooling_device *cdev,
+        unsigned long upper, unsigned long lower)
+{ return -ENODEV; }
+static inline int thermal_zone_unbind_cooling_device(
+        struct thermal_zone_device *tz, int trip,
+        struct thermal_cooling_device *cdev)
+{ return -ENODEV; }
+static inline void thermal_zone_device_update(struct thermal_zone_device *tz)
+{ }
+static inline struct thermal_cooling_device *
+thermal_cooling_device_register(char *type, void *devdata,
+        const struct thermal_cooling_device_ops *ops)
+{ return ERR_PTR(-ENODEV); }
+static inline struct thermal_cooling_device *
+thermal_of_cooling_device_register(struct device_node *np,
+        char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
+{ return ERR_PTR(-ENODEV); }
+static inline void thermal_cooling_device_unregister(
+        struct thermal_cooling_device *cdev)
+{ }
+static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
+                const char *name)
+{ return ERR_PTR(-ENODEV); }
+static inline int thermal_zone_get_temp(
+                struct thermal_zone_device *tz, unsigned long *temp)
+{ return -ENODEV; }
+static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
+{ return -ENODEV; }
+static inline struct thermal_instance *
+get_thermal_instance(struct thermal_zone_device *tz,
+        struct thermal_cooling_device *cdev, int trip)
+{ return ERR_PTR(-ENODEV); }
+static inline void thermal_cdev_update(struct thermal_cooling_device *cdev)
+{ }
+static inline void thermal_notify_framework(struct thermal_zone_device *tz,
+        int trip)
+{ }
+#endif /* CONFIG_THERMAL */
+
+#if defined(CONFIG_NET) && IS_ENABLED(CONFIG_THERMAL)
 extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
                                                 enum events event);
 #else