Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[sfrench/cifs-2.6.git] / 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_REMOVE, 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 void dev_pm_opp_remove(struct device *dev, unsigned long freq);
48
49 int dev_pm_opp_enable(struct device *dev, unsigned long freq);
50
51 int dev_pm_opp_disable(struct device *dev, unsigned long freq);
52
53 struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
54 #else
55 static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
56 {
57         return 0;
58 }
59
60 static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
61 {
62         return 0;
63 }
64
65 static inline int dev_pm_opp_get_opp_count(struct device *dev)
66 {
67         return 0;
68 }
69
70 static 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
76 static 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
82 static 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
88 static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
89                                         unsigned long u_volt)
90 {
91         return -EINVAL;
92 }
93
94 static inline void dev_pm_opp_remove(struct device *dev, unsigned long freq)
95 {
96 }
97
98 static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
99 {
100         return 0;
101 }
102
103 static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
104 {
105         return 0;
106 }
107
108 static 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)
116 int of_init_opp_table(struct device *dev);
117 void of_free_opp_table(struct device *dev);
118 #else
119 static inline int of_init_opp_table(struct device *dev)
120 {
121         return -EINVAL;
122 }
123
124 static inline void of_free_opp_table(struct device *dev)
125 {
126 }
127 #endif
128
129 #endif          /* __LINUX_OPP_H__ */