include/linux/cpu_cooling.h

   1 /*
   2  *  linux/include/linux/cpu_cooling.h
   3  *
   4  *  Copyright (C) 2012  Samsung Electronics Co., Ltd(http://www.samsung.com)
   5  *  Copyright (C) 2012  Amit Daniel <amit.kachhap@linaro.org>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; version 2 of the License.
  11  *
  12  *  This program is distributed in the hope that it will be useful, but
  13  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  20  *
  21  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  22  */
  23
  24 #ifndef __CPU_COOLING_H__
  25 #define __CPU_COOLING_H__
  26
  27 #include <linux/of.h>
  28 #include <linux/thermal.h>
  29 #include <linux/cpumask.h>
  30
  31 typedef int (*get_static_t)(cpumask_t *cpumask, int interval,
  32                             unsigned long voltage, u32 *power);
  33
  34 #ifdef CONFIG_CPU_THERMAL
  35 /**
  36  * cpufreq_cooling_register - function to create cpufreq cooling device.
  37  * @clip_cpus: cpumask of cpus where the frequency constraints will happen
  38  */
  39 struct thermal_cooling_device *
  40 cpufreq_cooling_register(const struct cpumask *clip_cpus);
  41
  42 struct thermal_cooling_device *
  43 cpufreq_power_cooling_register(const struct cpumask *clip_cpus,
  44                                u32 capacitance, get_static_t plat_static_func);
  45
  46 /**
  47  * of_cpufreq_cooling_register - create cpufreq cooling device based on DT.
  48  * @np: a valid struct device_node to the cooling device device tree node.
  49  * @clip_cpus: cpumask of cpus where the frequency constraints will happen
  50  */
  51 #ifdef CONFIG_THERMAL_OF
  52 struct thermal_cooling_device *
  53 of_cpufreq_cooling_register(struct device_node *np,
  54                             const struct cpumask *clip_cpus);
  55
  56 struct thermal_cooling_device *
  57 of_cpufreq_power_cooling_register(struct device_node *np,
  58                                   const struct cpumask *clip_cpus,
  59                                   u32 capacitance,
  60                                   get_static_t plat_static_func);
  61 #else
  62 static inline struct thermal_cooling_device *
  63 of_cpufreq_cooling_register(struct device_node *np,
  64                             const struct cpumask *clip_cpus)
  65 {
  66         return ERR_PTR(-ENOSYS);
  67 }
  68
  69 static inline struct thermal_cooling_device *
  70 of_cpufreq_power_cooling_register(struct device_node *np,
  71                                   const struct cpumask *clip_cpus,
  72                                   u32 capacitance,
  73                                   get_static_t plat_static_func)
  74 {
  75         return NULL;
  76 }
  77 #endif
  78
  79 /**
  80  * cpufreq_cooling_unregister - function to remove cpufreq cooling device.
  81  * @cdev: thermal cooling device pointer.
  82  */
  83 void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev);
  84
  85 unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq);
  86 #else /* !CONFIG_CPU_THERMAL */
  87 static inline struct thermal_cooling_device *
  88 cpufreq_cooling_register(const struct cpumask *clip_cpus)
  89 {
  90         return ERR_PTR(-ENOSYS);
  91 }
  92 static inline struct thermal_cooling_device *
  93 cpufreq_power_cooling_register(const struct cpumask *clip_cpus,
  94                                u32 capacitance, get_static_t plat_static_func)
  95 {
  96         return NULL;
  97 }
  98
  99 static inline struct thermal_cooling_device *
 100 of_cpufreq_cooling_register(struct device_node *np,
 101                             const struct cpumask *clip_cpus)
 102 {
 103         return ERR_PTR(-ENOSYS);
 104 }
 105
 106 static inline struct thermal_cooling_device *
 107 of_cpufreq_power_cooling_register(struct device_node *np,
 108                                   const struct cpumask *clip_cpus,
 109                                   u32 capacitance,
 110                                   get_static_t plat_static_func)
 111 {
 112         return NULL;
 113 }
 114
 115 static inline
 116 void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
 117 {
 118         return;
 119 }
 120 static inline
 121 unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq)
 122 {
 123         return THERMAL_CSTATE_INVALID;
 124 }
 125 #endif  /* CONFIG_CPU_THERMAL */
 126
 127 #endif /* __CPU_COOLING_H__ */