include/linux/clock_cooling.h

   1 /*
   2  *  linux/include/linux/clock_cooling.h
   3  *
   4  *  Copyright (C) 2014 Eduardo Valentin <edubezval@gmail.com>
   5  *
   6  *  Copyright (C) 2013  Texas Instruments Inc.
   7  *  Contact:  Eduardo Valentin <eduardo.valentin@ti.com>
   8  *
   9  *  Highly based on cpu_cooling.c.
  10  *  Copyright (C) 2012  Samsung Electronics Co., Ltd(http://www.samsung.com)
  11  *  Copyright (C) 2012  Amit Daniel <amit.kachhap@linaro.org>
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; version 2 of the License.
  16  *
  17  *  This program is distributed in the hope that it will be useful, but
  18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  */
  22
  23 #ifndef __CPU_COOLING_H__
  24 #define __CPU_COOLING_H__
  25
  26 #include <linux/of.h>
  27 #include <linux/thermal.h>
  28 #include <linux/cpumask.h>
  29
  30 #ifdef CONFIG_CLOCK_THERMAL
  31 /**
  32  * clock_cooling_register - function to create clock cooling device.
  33  * @dev: struct device pointer to the device used as clock cooling device.
  34  * @clock_name: string containing the clock used as cooling mechanism.
  35  */
  36 struct thermal_cooling_device *
  37 clock_cooling_register(struct device *dev, const char *clock_name);
  38
  39 /**
  40  * clock_cooling_unregister - function to remove clock cooling device.
  41  * @cdev: thermal cooling device pointer.
  42  */
  43 void clock_cooling_unregister(struct thermal_cooling_device *cdev);
  44
  45 unsigned long clock_cooling_get_level(struct thermal_cooling_device *cdev,
  46                                       unsigned long freq);
  47 #else /* !CONFIG_CLOCK_THERMAL */
  48 static inline struct thermal_cooling_device *
  49 clock_cooling_register(struct device *dev, const char *clock_name)
  50 {
  51         return NULL;
  52 }
  53 static inline
  54 void clock_cooling_unregister(struct thermal_cooling_device *cdev)
  55 {
  56 }
  57 static inline
  58 unsigned long clock_cooling_get_level(struct thermal_cooling_device *cdev,
  59                                       unsigned long freq)
  60 {
  61         return THERMAL_CSTATE_INVALID;
  62 }
  63 #endif  /* CONFIG_CLOCK_THERMAL */
  64
  65 #endif /* __CPU_COOLING_H__ */