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/notifier.h>
  19
  20struct dev_pm_opp;
  21struct device;
  22
  23enum dev_pm_opp_event {
  24        OPP_EVENT_ADD, OPP_EVENT_REMOVE, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
  25};
  26
  27#if defined(CONFIG_PM_OPP)
  28
  29unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
  30
  31unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
  32
  33int dev_pm_opp_get_opp_count(struct device *dev);
  34
  35struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  36                                              unsigned long freq,
  37                                              bool available);
  38
  39struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
  40                                              unsigned long *freq);
  41
  42struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
  43                                             unsigned long *freq);
  44
  45int dev_pm_opp_add(struct device *dev, unsigned long freq,
  46                   unsigned long u_volt);
  47void dev_pm_opp_remove(struct device *dev, unsigned long freq);
  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 void dev_pm_opp_remove(struct device *dev, unsigned long freq)
  95{
  96}
  97
  98static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
  99{
 100        return 0;
 101}
 102
 103static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
 104{
 105        return 0;
 106}
 107
 108static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
 109                                                        struct device *dev)
 110{
 111        return ERR_PTR(-EINVAL);
 112}
 113#endif          /* CONFIG_PM_OPP */
 114
 115#if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
 116int of_init_opp_table(struct device *dev);
 117void of_free_opp_table(struct device *dev);
 118#else
 119static inline int of_init_opp_table(struct device *dev)
 120{
 121        return -EINVAL;
 122}
 123
 124static inline void of_free_opp_table(struct device *dev)
 125{
 126}
 127#endif
 128
 129#endif          /* __LINUX_OPP_H__ */
 130