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
  51 #ifdef CONFIG_OF
  52 int of_init_opp_table(struct device *dev);
  53 #else
  54 static inline int of_init_opp_table(struct device *dev)
  55 {
  56         return -EINVAL;
  57 }
  58 #endif /* CONFIG_OF */
  59 #else
  60 static inline unsigned long opp_get_voltage(struct opp *opp)
  61 {
  62         return 0;
  63 }
  64
  65 static inline unsigned long opp_get_freq(struct opp *opp)
  66 {
  67         return 0;
  68 }
  69
  70 static inline int opp_get_opp_count(struct device *dev)
  71 {
  72         return 0;
  73 }
  74
  75 static inline struct opp *opp_find_freq_exact(struct device *dev,
  76                                         unsigned long freq, bool available)
  77 {
  78         return ERR_PTR(-EINVAL);
  79 }
  80
  81 static inline struct opp *opp_find_freq_floor(struct device *dev,
  82                                         unsigned long *freq)
  83 {
  84         return ERR_PTR(-EINVAL);
  85 }
  86
  87 static inline struct opp *opp_find_freq_ceil(struct device *dev,
  88                                         unsigned long *freq)
  89 {
  90         return ERR_PTR(-EINVAL);
  91 }
  92
  93 static inline int opp_add(struct device *dev, unsigned long freq,
  94                                         unsigned long u_volt)
  95 {
  96         return -EINVAL;
  97 }
  98
  99 static inline int opp_enable(struct device *dev, unsigned long freq)
 100 {
 101         return 0;
 102 }
 103
 104 static inline int opp_disable(struct device *dev, unsigned long freq)
 105 {
 106         return 0;
 107 }
 108
 109 static inline struct srcu_notifier_head *opp_get_notifier(struct device *dev)
 110 {
 111         return ERR_PTR(-EINVAL);
 112 }
 113 #endif          /* CONFIG_PM_OPP */
 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__ */