drivers: misc: Thermal estimator driver

Added driver which estimates temperature based on
a linear formula from other temperature sensors.

Edit: WQ_RESCUER has been removed for K4.9 port.

bug 1007726

Change-Id: Ic0d3ba7f0d369d4321f55b03e6326ff4efbb512e
Signed-off-by: Joshua Primero <jprimero@nvidia.com>
Reviewed-on: http://git-master/r/105988

1 files changed, 77 insertions, 0 deletions

diff --git a/include/linux/therm_est.h b/include/linux/therm_est.h
new file mode 100644
index 000000000..035b08fa9
--- /dev/null
+++ b/include/linux/therm_est.h
@@ -0,0 +1,77 @@
+/*
+ * include/linux/therm_est.h
+ *
+ * Copyright (c) 2010-2012, NVIDIA Corporation.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _LINUX_THERM_EST_H
+#define _LINUX_THERM_EST_H
+
+#include <linux/workqueue.h>
+
+#define HIST_LEN (20)
+
+struct therm_est_subdevice {
+        void *dev_data;
+        int (*get_temp)(void *, long *);
+        long coeffs[HIST_LEN];
+        long hist[HIST_LEN];
+};
+
+struct therm_estimator {
+        long therm_est_lo_limit;
+        long therm_est_hi_limit;
+        void (*callback)(void *);
+        void *callback_data;
+        long cur_temp;
+        long polling_period;
+        struct workqueue_struct *workqueue;
+        struct delayed_work therm_est_work;
+        long toffset;
+        int ntemp;
+        int ndevs;
+        struct therm_est_subdevice **devs;
+};
+
+#ifdef CONFIG_THERM_EST
+struct therm_estimator *therm_est_register(
+                        struct therm_est_subdevice **devs,
+                        int ndevs,
+                        long toffset,
+                        long pperiod);
+int therm_est_get_temp(struct therm_estimator *est, long *temp);
+int therm_est_set_limits(struct therm_estimator *est,
+                        long lo_limit,
+                        long hi_limit);
+int therm_est_set_alert(struct therm_estimator *est,
+                        void (*cb)(void *),
+                        void *cb_data);
+#else
+static inline struct therm_estimator *therm_est_register(
+                        struct therm_est_subdevice **devs,
+                        int ndevs,
+                        long toffset,
+                        long pperiod)
+{ return NULL; }
+static inline int therm_est_get_temp(struct therm_estimator *est, long *temp)
+{ return -EINVAL; }
+static inline int therm_est_set_limits(struct therm_estimator *est,
+                        long lo_limit,
+                        long hi_limit)
+{ return -EINVAL; }
+static inline int therm_est_set_alert(struct therm_estimator *est,
+                        void (*cb)(void *),
+                        void *cb_data)
+{ return -EINVAL; }
+#endif
+#endif /* _LINUX_THERM_EST_H */