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
21 struct opp;
22
23 enum opp_event {
24 OPP_EVENT_ADD, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
25 };
26
27 #if defined(CONFIG_PM_OPP)
28
29 unsigned long opp_get_voltage(struct opp *opp);
30
31 unsigned long opp_get_freq(struct opp *opp);
32
33 int opp_get_opp_count(struct device *dev);
34
35 struct opp *opp_find_freq_exact(struct device *dev, unsigned long freq,
36 bool available);
37
38 struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq);
39
40 struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq);
41
42 int opp_add(struct device *dev, unsigned long freq, unsigned long u_volt);
43
44 int opp_enable(struct device *dev, unsigned long freq);
45
46 int opp_disable(struct device *dev, unsigned long freq);
47
48 struct srcu_notifier_head *opp_get_notifier(struct device *dev);
49
50 #else
51 static inline unsigned long opp_get_voltage(struct opp *opp)
52 {
53 return 0;
54 }
55
56 static inline unsigned long opp_get_freq(struct opp *opp)
57 {
58 return 0;
59 }
60
61 static inline int opp_get_opp_count(struct device *dev)
62 {
63 return 0;
64 }
65
66 static inline struct opp *opp_find_freq_exact(struct device *dev,
67 unsigned long freq, bool available)
68 {
69 return ERR_PTR(-EINVAL);
70 }
71
72 static inline struct opp *opp_find_freq_floor(struct device *dev,
73 unsigned long *freq)
74 {
75 return ERR_PTR(-EINVAL);
76 }
77
78 static inline struct opp *opp_find_freq_ceil(struct device *dev,
79 unsigned long *freq)
80 {
81 return ERR_PTR(-EINVAL);
82 }
83
84 static inline int opp_add(struct device *dev, unsigned long freq,
85 unsigned long u_volt)
86 {
87 return -EINVAL;
88 }
89
90 static inline int opp_enable(struct device *dev, unsigned long freq)
91 {
92 return 0;
93 }
94
95 static inline int opp_disable(struct device *dev, unsigned long freq)
96 {
97 return 0;
98 }
99
100 static 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_CPU_FREQ) && defined(CONFIG_PM_OPP)
107 int opp_init_cpufreq_table(struct device *dev,
108 struct cpufreq_frequency_table **table);
109 void opp_free_cpufreq_table(struct device *dev,
110 struct cpufreq_frequency_table **table);
111 #else
112 static inline int opp_init_cpufreq_table(struct device *dev,
113 struct cpufreq_frequency_table **table)
114 {
115 return -EINVAL;
116 }
117
118 static inline
119 void opp_free_cpufreq_table(struct device *dev,
120 struct cpufreq_frequency_table **table)
121 {
122 }
123 #endif /* CONFIG_CPU_FREQ */
124
125 #endif /* __LINUX_OPP_H__ */
126
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