linux/include/linux/opp.h
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   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
  21struct opp;
  22struct device;
  23
  24enum opp_event {
  25        OPP_EVENT_ADD, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
  26};
  27
  28#if defined(CONFIG_PM_OPP)
  29
  30unsigned long opp_get_voltage(struct opp *opp);
  31
  32unsigned long opp_get_freq(struct opp *opp);
  33
  34int opp_get_opp_count(struct device *dev);
  35
  36struct opp *opp_find_freq_exact(struct device *dev, unsigned long freq,
  37                                bool available);
  38
  39struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq);
  40
  41struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq);
  42
  43int opp_add(struct device *dev, unsigned long freq, unsigned long u_volt);
  44
  45int opp_enable(struct device *dev, unsigned long freq);
  46
  47int opp_disable(struct device *dev, unsigned long freq);
  48
  49struct srcu_notifier_head *opp_get_notifier(struct device *dev);
  50
  51#else
  52static inline unsigned long opp_get_voltage(struct opp *opp)
  53{
  54        return 0;
  55}
  56
  57static inline unsigned long opp_get_freq(struct opp *opp)
  58{
  59        return 0;
  60}
  61
  62static inline int opp_get_opp_count(struct device *dev)
  63{
  64        return 0;
  65}
  66
  67static inline struct opp *opp_find_freq_exact(struct device *dev,
  68                                        unsigned long freq, bool available)
  69{
  70        return ERR_PTR(-EINVAL);
  71}
  72
  73static inline struct opp *opp_find_freq_floor(struct device *dev,
  74                                        unsigned long *freq)
  75{
  76        return ERR_PTR(-EINVAL);
  77}
  78
  79static inline struct opp *opp_find_freq_ceil(struct device *dev,
  80                                        unsigned long *freq)
  81{
  82        return ERR_PTR(-EINVAL);
  83}
  84
  85static inline int opp_add(struct device *dev, unsigned long freq,
  86                                        unsigned long u_volt)
  87{
  88        return -EINVAL;
  89}
  90
  91static inline int opp_enable(struct device *dev, unsigned long freq)
  92{
  93        return 0;
  94}
  95
  96static inline int opp_disable(struct device *dev, unsigned long freq)
  97{
  98        return 0;
  99}
 100
 101static inline struct srcu_notifier_head *opp_get_notifier(struct device *dev)
 102{
 103        return ERR_PTR(-EINVAL);
 104}
 105#endif          /* CONFIG_PM_OPP */
 106
 107#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 108int opp_init_cpufreq_table(struct device *dev,
 109                            struct cpufreq_frequency_table **table);
 110void opp_free_cpufreq_table(struct device *dev,
 111                                struct cpufreq_frequency_table **table);
 112#else
 113static inline int opp_init_cpufreq_table(struct device *dev,
 114                            struct cpufreq_frequency_table **table)
 115{
 116        return -EINVAL;
 117}
 118
 119static inline
 120void opp_free_cpufreq_table(struct device *dev,
 121                                struct cpufreq_frequency_table **table)
 122{
 123}
 124#endif          /* CONFIG_CPU_FREQ */
 125
 126#endif          /* __LINUX_OPP_H__ */
 127
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