include/linux/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 opp;
  22 struct device;
  23
  24 enum 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 opp *opp);
  31
  32 unsigned long dev_pm_opp_get_freq(struct opp *opp);
  33
  34 int dev_pm_opp_get_opp_count(struct device *dev);
  35
  36 struct opp *dev_pm_opp_find_freq_exact(struct device *dev, unsigned long freq,
  37                                 bool available);
  38
  39 struct opp *dev_pm_opp_find_freq_floor(struct device *dev, unsigned long *freq);
  40
  41 struct opp *dev_pm_opp_find_freq_ceil(struct device *dev, unsigned long *freq);
  42
  43 int dev_pm_opp_add(struct device *dev, unsigned long freq,
  44                    unsigned long u_volt);
  45
  46 int dev_pm_opp_enable(struct device *dev, unsigned long freq);
  47
  48 int dev_pm_opp_disable(struct device *dev, unsigned long freq);
  49
  50 struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
  51 #else
  52 static inline unsigned long dev_pm_opp_get_voltage(struct opp *opp)
  53 {
  54         return 0;
  55 }
  56
  57 static inline unsigned long dev_pm_opp_get_freq(struct opp *opp)
  58 {
  59         return 0;
  60 }
  61
  62 static inline int dev_pm_opp_get_opp_count(struct device *dev)
  63 {
  64         return 0;
  65 }
  66
  67 static inline struct opp *dev_pm_opp_find_freq_exact(struct device *dev,
  68                                         unsigned long freq, bool available)
  69 {
  70         return ERR_PTR(-EINVAL);
  71 }
  72
  73 static inline struct opp *dev_pm_opp_find_freq_floor(struct device *dev,
  74                                         unsigned long *freq)
  75 {
  76         return ERR_PTR(-EINVAL);
  77 }
  78
  79 static inline struct opp *dev_pm_opp_find_freq_ceil(struct device *dev,
  80                                         unsigned long *freq)
  81 {
  82         return ERR_PTR(-EINVAL);
  83 }
  84
  85 static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
  86                                         unsigned long u_volt)
  87 {
  88         return -EINVAL;
  89 }
  90
  91 static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
  92 {
  93         return 0;
  94 }
  95
  96 static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
  97 {
  98         return 0;
  99 }
 100
 101 static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
 102                                                         struct device *dev)
 103 {
 104         return ERR_PTR(-EINVAL);
 105 }
 106 #endif          /* CONFIG_PM_OPP */
 107
 108 #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
 109 int of_init_opp_table(struct device *dev);
 110 #else
 111 static inline int of_init_opp_table(struct device *dev)
 112 {
 113         return -EINVAL;
 114 }
 115 #endif
 116
 117 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 118 int dev_pm_opp_init_cpufreq_table(struct device *dev,
 119                             struct cpufreq_frequency_table **table);
 120 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 121                                 struct cpufreq_frequency_table **table);
 122 #else
 123 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 124                             struct cpufreq_frequency_table **table)
 125 {
 126         return -EINVAL;
 127 }
 128
 129 static inline
 130 void dev_pm_opp_free_cpufreq_table(struct device *dev,
 131                                 struct cpufreq_frequency_table **table)
 132 {
 133 }
 134 #endif          /* CONFIG_CPU_FREQ */
 135
 136 #endif          /* __LINUX_OPP_H__ */