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