include/linux/devfreq_cooling.h

   1 /*
   2  * devfreq_cooling: Thermal cooling device implementation for devices using
   3  *                  devfreq
   4  *
   5  * Copyright (C) 2014-2015 ARM Limited
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  12  * kind, whether express or implied; without even the implied warranty
  13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #ifndef __DEVFREQ_COOLING_H__
  18 #define __DEVFREQ_COOLING_H__
  19
  20 #include <linux/devfreq.h>
  21 #include <linux/thermal.h>
  22
  23 #ifdef CONFIG_DEVFREQ_THERMAL
  24
  25 /**
  26  * struct devfreq_cooling_power - Devfreq cooling power ops
  27  * @get_static_power:   Take voltage, in mV, and return the static power
  28  *                      in mW.  If NULL, the static power is assumed
  29  *                      to be 0.
  30  * @get_dynamic_power:  Take voltage, in mV, and frequency, in HZ, and
  31  *                      return the dynamic power draw in mW.  If NULL,
  32  *                      a simple power model is used.
  33  * @dyn_power_coeff:    Coefficient for the simple dynamic power model in
  34  *                      mW/(MHz mV mV).
  35  *                      If get_dynamic_power() is NULL, then the
  36  *                      dynamic power is calculated as
  37  *                      @dyn_power_coeff * frequency * voltage^2
  38  */
  39 struct devfreq_cooling_power {
  40         unsigned long (*get_static_power)(unsigned long voltage);
  41         unsigned long (*get_dynamic_power)(unsigned long freq,
  42                                            unsigned long voltage);
  43         unsigned long dyn_power_coeff;
  44 };
  45
  46 struct thermal_cooling_device *
  47 of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
  48                                   struct devfreq_cooling_power *dfc_power);
  49 struct thermal_cooling_device *
  50 of_devfreq_cooling_register(struct device_node *np, struct devfreq *df);
  51 struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df);
  52 void devfreq_cooling_unregister(struct thermal_cooling_device *dfc);
  53
  54 #else /* !CONFIG_DEVFREQ_THERMAL */
  55
  56 struct thermal_cooling_device *
  57 of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
  58                                   struct devfreq_cooling_power *dfc_power)
  59 {
  60         return ERR_PTR(-EINVAL);
  61 }
  62
  63 static inline struct thermal_cooling_device *
  64 of_devfreq_cooling_register(struct device_node *np, struct devfreq *df)
  65 {
  66         return ERR_PTR(-EINVAL);
  67 }
  68
  69 static inline struct thermal_cooling_device *
  70 devfreq_cooling_register(struct devfreq *df)
  71 {
  72         return ERR_PTR(-EINVAL);
  73 }
  74
  75 static inline void
  76 devfreq_cooling_unregister(struct thermal_cooling_device *dfc)
  77 {
  78 }
  79
  80 #endif /* CONFIG_DEVFREQ_THERMAL */
  81 #endif /* __DEVFREQ_COOLING_H__ */