LXR linux/include/linux/pm

   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 dev_pm_opp;
  22struct device;
  23
  24enum dev_pm_opp_event {
  25        OPP_EVENT_ADD, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
  26};
  27
  28#if defined(CONFIG_PM_OPP)
  29
  30unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
  31
  32unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
  33
  34int dev_pm_opp_get_opp_count(struct device *dev);
  35
  36struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  37                                              unsigned long freq,
  38                                              bool available);
  39
  40struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
  41                                              unsigned long *freq);
  42
  43struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
  44                                             unsigned long *freq);
  45
  46int dev_pm_opp_add(struct device *dev, unsigned long freq,
  47                   unsigned long u_volt);
  48
  49int dev_pm_opp_enable(struct device *dev, unsigned long freq);
  50
  51int dev_pm_opp_disable(struct device *dev, unsigned long freq);
  52
  53struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
  54#else
  55static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
  56{
  57        return 0;
  58}
  59
  60static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
  61{
  62        return 0;
  63}
  64
  65static inline int dev_pm_opp_get_opp_count(struct device *dev)
  66{
  67        return 0;
  68}
  69
  70static 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
  76static 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
  82static 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
  88static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
  89                                        unsigned long u_volt)
  90{
  91        return -EINVAL;
  92}
  93
  94static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
  95{
  96        return 0;
  97}
  98
  99static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
 100{
 101        return 0;
 102}
 103
 104static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
 105                                                        struct device *dev)
 106{
 107        return ERR_PTR(-EINVAL);
 108}
 109#endif          /* CONFIG_PM_OPP */
 110
 111#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
 112int of_init_opp_table(struct device *dev);
 113#else
 114static inline int of_init_opp_table(struct device *dev)
 115{
 116        return -EINVAL;
 117}
 118#endif
 119
 120#if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
 121int dev_pm_opp_init_cpufreq_table(struct device *dev,
 122                            struct cpufreq_frequency_table **table);
 123void dev_pm_opp_free_cpufreq_table(struct device *dev,
 124                                struct cpufreq_frequency_table **table);
 125#else
 126static inline int dev_pm_opp_init_cpufreq_table(struct device *dev,
 127                            struct cpufreq_frequency_table **table)
 128{
 129        return -EINVAL;
 130}
 131
 132static inline
 133void dev_pm_opp_free_cpufreq_table(struct device *dev,
 134                                struct cpufreq_frequency_table **table)
 135{
 136}
 137#endif          /* CONFIG_CPU_FREQ */
 138
 139#endif          /* __LINUX_OPP_H__ */
 140