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#else
  51static inline unsigned long opp_get_voltage(struct opp *opp)
  52{
  53        return 0;
  54}
  55
  56static inline unsigned long opp_get_freq(struct opp *opp)
  57{
  58        return 0;
  59}
  60
  61static inline int opp_get_opp_count(struct device *dev)
  62{
  63        return 0;
  64}
  65
  66static inline struct opp *opp_find_freq_exact(struct device *dev,
  67                                        unsigned long freq, bool available)
  68{
  69        return ERR_PTR(-EINVAL);
  70}
  71
  72static inline struct opp *opp_find_freq_floor(struct device *dev,
  73                                        unsigned long *freq)
  74{
  75        return ERR_PTR(-EINVAL);
  76}
  77
  78static inline struct opp *opp_find_freq_ceil(struct device *dev,
  79                                        unsigned long *freq)
  80{
  81        return ERR_PTR(-EINVAL);
  82}
  83
  84static inline int opp_add(struct device *dev, unsigned long freq,
  85                                        unsigned long u_volt)
  86{
  87        return -EINVAL;
  88}
  89
  90static inline int opp_enable(struct device *dev, unsigned long freq)
  91{
  92        return 0;
  93}
  94
  95static inline int opp_disable(struct device *dev, unsigned long freq)
  96{
  97        return 0;
  98}
  99
 100static 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)
 107int of_init_opp_table(struct device *dev);
 108#else
 109static 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)
 116int opp_init_cpufreq_table(struct device *dev,
 117                            struct cpufreq_frequency_table **table);
 118void opp_free_cpufreq_table(struct device *dev,
 119                                struct cpufreq_frequency_table **table);
 120#else
 121static inline int opp_init_cpufreq_table(struct device *dev,
 122                            struct cpufreq_frequency_table **table)
 123{
 124        return -EINVAL;
 125}
 126
 127static inline
 128void 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__ */
 135
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