include/linux/pm_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/notifier.h>
  19
  20 struct dev_pm_opp;
  21 struct device;
  22
  23 enum dev_pm_opp_event {
  24         OPP_EVENT_ADD, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
  25 };
  26
  27 #if defined(CONFIG_PM_OPP)
  28
  29 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
  30
  31 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
  32
  33 int dev_pm_opp_get_opp_count(struct device *dev);
  34
  35 struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  36                                               unsigned long freq,
  37                                               bool available);
  38
  39 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
  40                                               unsigned long *freq);
  41
  42 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
  43                                              unsigned long *freq);
  44
  45 int dev_pm_opp_add(struct device *dev, unsigned long freq,
  46                    unsigned long u_volt);
  47
  48 int dev_pm_opp_enable(struct device *dev, unsigned long freq);
  49
  50 int dev_pm_opp_disable(struct device *dev, unsigned long freq);
  51
  52 struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
  53 #else
  54 static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
  55 {
  56         return 0;
  57 }
  58
  59 static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
  60 {
  61         return 0;
  62 }
  63
  64 static inline int dev_pm_opp_get_opp_count(struct device *dev)
  65 {
  66         return 0;
  67 }
  68
  69 static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  70                                         unsigned long freq, bool available)
  71 {
  72         return ERR_PTR(-EINVAL);
  73 }
  74
  75 static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
  76                                         unsigned long *freq)
  77 {
  78         return ERR_PTR(-EINVAL);
  79 }
  80
  81 static inline struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
  82                                         unsigned long *freq)
  83 {
  84         return ERR_PTR(-EINVAL);
  85 }
  86
  87 static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
  88                                         unsigned long u_volt)
  89 {
  90         return -EINVAL;
  91 }
  92
  93 static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
  94 {
  95         return 0;
  96 }
  97
  98 static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
  99 {
 100         return 0;
 101 }
 102
 103 static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
 104                                                         struct device *dev)
 105 {
 106         return ERR_PTR(-EINVAL);
 107 }
 108 #endif          /* CONFIG_PM_OPP */
 109
 110 #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
 111 int of_init_opp_table(struct device *dev);
 112 #else
 113 static inline int of_init_opp_table(struct device *dev)
 114 {
 115         return -EINVAL;
 116 }
 117 #endif
 118
 119 #endif          /* __LINUX_OPP_H__ */