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/notifier.h>
  19
  20 struct dev_pm_opp;
  21 struct device;
  22
  23 enum dev_pm_opp_event {
  24         OPP_EVENT_ADD, OPP_EVENT_REMOVE, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
  25 };
  26
  27 #if defined(CONFIG_PM_OPP)
  28
  29 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
  30
  31 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
  32
  33 int dev_pm_opp_get_opp_count(struct device *dev);
  34
  35 struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  36                                               unsigned long freq,
  37                                               bool available);
  38
  39 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
  40                                               unsigned long *freq);
  41
  42 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
  43                                              unsigned long *freq);
  44
  45 int dev_pm_opp_add(struct device *dev, unsigned long freq,
  46                    unsigned long u_volt);
  47 void dev_pm_opp_remove(struct device *dev, unsigned long freq);
  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 void dev_pm_opp_remove(struct device *dev, unsigned long freq)
  95 {
  96 }
  97
  98 static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
  99 {
 100         return 0;
 101 }
 102
 103 static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
 104 {
 105         return 0;
 106 }
 107
 108 static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
 109                                                         struct device *dev)
 110 {
 111         return ERR_PTR(-EINVAL);
 112 }
 113 #endif          /* CONFIG_PM_OPP */
 114
 115 #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
 116 int of_init_opp_table(struct device *dev);
 117 void of_free_opp_table(struct device *dev);
 118 #else
 119 static inline int of_init_opp_table(struct device *dev)
 120 {
 121         return -EINVAL;
 122 }
 123
 124 static inline void of_free_opp_table(struct device *dev)
 125 {
 126 }
 127 #endif
 128
 129 #endif          /* __LINUX_OPP_H__ */