Thermal: Add thermal governor registration APIs

This patch creates a structure to hold platform
thermal governor information, and provides APIs
for individual thermal governors to register/unregister
with the Thermal framework.

Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 58cb1c036a0e..6182bd5f7504 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -46,6 +46,9 @@
 #define THERMAL_GENL_VERSION                    0x01
 #define THERMAL_GENL_MCAST_GROUP_NAME           "thermal_mc_group"
 
+/* Default Thermal Governor: Does Linear Throttling */
+#define DEFAULT_THERMAL_GOVERNOR        "step_wise"
+
 struct thermal_zone_device;
 struct thermal_cooling_device;
 
@@ -158,6 +161,7 @@ struct thermal_zone_device {
         unsigned int forced_passive;
         const struct thermal_zone_device_ops *ops;
         const struct thermal_zone_params *tzp;
+        struct thermal_governor *governor;
         struct list_head thermal_instances;
         struct idr idr;
         struct mutex lock; /* protect thermal_instances list */
@@ -165,6 +169,14 @@ struct thermal_zone_device {
         struct delayed_work poll_queue;
 };
 
+/* Structure that holds thermal governor information */
+struct thermal_governor {
+        char name[THERMAL_NAME_LENGTH];
+        int (*throttle)(struct thermal_zone_device *tz, int trip);
+        struct list_head        governor_list;
+        struct module           *owner;
+};
+
 /* Structure that holds binding parameters for a zone */
 struct thermal_bind_params {
         struct thermal_cooling_device *cdev;
@@ -189,6 +201,7 @@ struct thermal_bind_params {
 
 /* Structure to define Thermal Zone parameters */
 struct thermal_zone_params {
+        char governor_name[THERMAL_NAME_LENGTH];
         int num_tbps;   /* Number of tbp entries */
         struct thermal_bind_params *tbp;
 };
@@ -219,6 +232,9 @@ int get_tz_trend(struct thermal_zone_device *, int);
 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
                 struct thermal_cooling_device *, int);
 
+int thermal_register_governor(struct thermal_governor *);
+void thermal_unregister_governor(struct thermal_governor *);
+
 #ifdef CONFIG_NET
 extern int thermal_generate_netlink_event(u32 orig, enum events event);
 #else