include/linux/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/cpufreq.h>
  19
  20 struct opp;
  21
  22 #if defined(CONFIG_PM_OPP)
  23
  24 unsigned long opp_get_voltage(struct opp *opp);
  25
  26 unsigned long opp_get_freq(struct opp *opp);
  27
  28 int opp_get_opp_count(struct device *dev);
  29
  30 struct opp *opp_find_freq_exact(struct device *dev, unsigned long freq,
  31                                 bool available);
  32
  33 struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq);
  34
  35 struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq);
  36
  37 int opp_add(struct device *dev, unsigned long freq, unsigned long u_volt);
  38
  39 int opp_enable(struct device *dev, unsigned long freq);
  40
  41 int opp_disable(struct device *dev, unsigned long freq);
  42
  43 #else
  44 static inline unsigned long opp_get_voltage(struct opp *opp)
  45 {
  46         return 0;
  47 }
  48
  49 static inline unsigned long opp_get_freq(struct opp *opp)
  50 {
  51         return 0;
  52 }
  53
  54 static inline int opp_get_opp_count(struct device *dev)
  55 {
  56         return 0;
  57 }
  58
  59 static inline struct opp *opp_find_freq_exact(struct device *dev,
  60                                         unsigned long freq, bool available)
  61 {
  62         return ERR_PTR(-EINVAL);
  63 }
  64
  65 static inline struct opp *opp_find_freq_floor(struct device *dev,
  66                                         unsigned long *freq)
  67 {
  68         return ERR_PTR(-EINVAL);
  69 }
  70
  71 static inline struct opp *opp_find_freq_ceil(struct device *dev,
  72                                         unsigned long *freq)
  73 {
  74         return ERR_PTR(-EINVAL);
  75 }
  76
  77 static inline int opp_add(struct device *dev, unsigned long freq,
  78                                         unsigned long u_volt)
  79 {
  80         return -EINVAL;
  81 }
  82
  83 static inline int opp_enable(struct device *dev, unsigned long freq)
  84 {
  85         return 0;
  86 }
  87
  88 static inline int opp_disable(struct device *dev, unsigned long freq)
  89 {
  90         return 0;
  91 }
  92 #endif          /* CONFIG_PM */
  93
  94 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
  95 int opp_init_cpufreq_table(struct device *dev,
  96                             struct cpufreq_frequency_table **table);
  97 #else
  98 static inline int opp_init_cpufreq_table(struct device *dev,
  99                             struct cpufreq_frequency_table **table)
 100 {
 101         return -EINVAL;
 102 }
 103 #endif          /* CONFIG_CPU_FREQ */
 104
 105 #endif          /* __LINUX_OPP_H__ */