drivers: misc: fan thermal estimator driver

Thermal estimator driver that estimates temperature based on
a linear formula from other temperature sensors

This estimated thermal point is used to drive fan

Change-Id: Ic6f82473435901514bca47cfda7a453ab64468e0
Signed-off-by: Anshul Jain <anshulj@nvidia.com>
Reviewed-on: http://git-master/r/167700

1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/therm_est.h b/include/linux/therm_est.h
index 0a900ef22..29bdf8ba6 100644
--- a/include/linux/therm_est.h
+++ b/include/linux/therm_est.h
@@ -21,6 +21,8 @@
 
 #define HIST_LEN (20)
 
+#define MAX_ACTIVE_STATES 10
+
 struct therm_est_subdevice {
         void *dev_data;
         int (*get_temp)(void *, long *);
@@ -40,4 +42,18 @@ struct therm_est_data {
         struct therm_est_subdevice devs[];
 };
 
+struct therm_fan_est_subdevice {
+        void *dev_data;
+        int (*get_temp)(void *, long *);
+        long coeffs[HIST_LEN];
+        long hist[HIST_LEN];
+};
+
+struct therm_fan_est_data {
+        long toffset;
+        long polling_period;
+        int ndevs;
+        int active_trip_temps[MAX_ACTIVE_STATES];
+        struct therm_fan_est_subdevice devs[];
+};
 #endif /* _LINUX_THERM_EST_H */