include/linux/pm_opp.h

   1 /*
   2  * Generic OPP Interface
   3  *
   4  * Copyright (C) 2009-2010 Texas Instruments Incorporated.
   5  *      Nishanth Menon
   6  *      Romit Dasgupta
   7  *      Kevin Hilman
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #ifndef __LINUX_OPP_H__
  15 #define __LINUX_OPP_H__
  16
  17 #include <linux/err.h>
  18 #include <linux/cpufreq.h>
  19 #include <linux/notifier.h>
  20
  21 struct dev_pm_opp;
  22 struct device;
  23
  24 enum dev_pm_opp_event {
  25         OPP_EVENT_ADD, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
  26 };
  27
  28 #if defined(CONFIG_PM_OPP)
  29
  30 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
  31
  32 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
  33
  34 int dev_pm_opp_get_opp_count(struct device *dev);
  35
  36 struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  37                                               unsigned long freq,
  38                                               bool available);
  39
  40 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
  41                                               unsigned long *freq);
  42
  43 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
  44                                              unsigned long *freq);
  45
  46 int dev_pm_opp_add(struct device *dev, unsigned long freq,
  47                    unsigned long u_volt);
  48
  49 int dev_pm_opp_enable(struct device *dev, unsigned long freq);
  50
  51 int dev_pm_opp_disable(struct device *dev, unsigned long freq);
  52
  53 struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
  54 #else
  55 static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
  56 {
  57         return 0;
  58 }
  59
  60 static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
  61 {
  62         return 0;
  63 }
  64
  65 static inline int dev_pm_opp_get_opp_count(struct device *dev)
  66 {
  67         return 0;
  68 }
  69
  70 static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  71                                         unsigned long freq, bool available)
  72 {
  73         return ERR_PTR(-EINVAL);
  74 }
  75
  76 static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
  77                                         unsigned long *freq)
  78 {
  79         return ERR_PTR(-EINVAL);
  80 }
  81
  82 static inline struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
  83                                         unsigned long *freq)
  84 {
  85         return ERR_PTR(-EINVAL);
  86 }
  87
  88 static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
  89                                         unsigned long u_volt)
  90 {
  91         return -EINVAL;
  92 }
  93
  94 static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
  95 {
  96         return 0;
  97 }
  98
  99 static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
 100 {
 101         return 0;
 102 }
 103
 104 static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
 105                                                         struct device *dev)
 106 {
 107         return ERR_PTR(-EINVAL);
 108 }
 109 #endif          /* CONFIG_PM_OPP */
 110
 111 #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
 112 int of_init_opp_table(struct device *dev);
 113 #else
 114 static inline int of_init_opp_table(struct device *dev)
 115 {
 116         return -EINVAL;
 117 }
 118 #endif
 119
 120 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 121 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 122                             struct cpufreq_frequency_table **table);
 123 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 124                                 struct cpufreq_frequency_table **table);
 125 #else
 126 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 127                             struct cpufreq_frequency_table **table)
 128 {
 129         return -EINVAL;
 130 }
 131
 132 static inline
 133 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 134                                 struct cpufreq_frequency_table **table)
 135 {
 136 }
 137 #endif          /* CONFIG_CPU_FREQ */
 138
 139 #endif          /* __LINUX_OPP_H__ */