1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* devfreq-event: a framework to provide raw data and events of devfreq devices
*
* Copyright (C) 2014 Samsung Electronics
* Author: Chanwoo Choi <cw00.choi@samsung.com>
*/
#ifndef __LINUX_DEVFREQ_EVENT_H__
#define __LINUX_DEVFREQ_EVENT_H__
#include <linux/device.h>
/**
* struct devfreq_event_dev - the devfreq-event device
*
* @node : Contain the devfreq-event device that have been registered.
* @dev : the device registered by devfreq-event class. dev.parent is
* the device using devfreq-event.
* @lock : a mutex to protect accessing devfreq-event.
* @enable_count: the number of enable function have been called.
* @desc : the description for devfreq-event device.
*
* This structure contains devfreq-event device information.
*/
struct devfreq_event_dev {
struct list_head node;
struct device dev;
struct mutex lock;
u32 enable_count;
const struct devfreq_event_desc *desc;
};
/**
* struct devfreq_event_data - the devfreq-event data
*
* @load_count : load count of devfreq-event device for the given period.
* @total_count : total count of devfreq-event device for the given period.
* each count may represent a clock cycle, a time unit
* (ns/us/...), or anything the device driver wants.
* Generally, utilization is load_count / total_count.
*
* This structure contains the data of devfreq-event device for polling period.
*/
struct devfreq_event_data {
unsigned long load_count;
unsigned long total_count;
};
/**
* struct devfreq_event_ops - the operations of devfreq-event device
*
* @enable : Enable the devfreq-event device.
* @disable : Disable the devfreq-event device.
* @reset : Reset all setting of the devfreq-event device.
* @set_event : Set the specific event type for the devfreq-event device.
* @get_event : Get the result of the devfreq-event devie with specific
* event type.
*
* This structure contains devfreq-event device operations which can be
* implemented by devfreq-event device drivers.
*/
struct devfreq_event_ops {
/* Optional functions */
int (*enable)(struct devfreq_event_dev *edev);
int (*disable)(struct devfreq_event_dev *edev);
int (*reset)(struct devfreq_event_dev *edev);
/* Mandatory functions */
int (*set_event)(struct devfreq_event_dev *edev);
int (*get_event)(struct devfreq_event_dev *edev,
struct devfreq_event_data *edata);
};
/**
* struct devfreq_event_desc - the descriptor of devfreq-event device
*
* @name : the name of devfreq-event device.
* @event_type : the type of the event determined and used by driver
* @driver_data : the private data for devfreq-event driver.
* @ops : the operation to control devfreq-event device.
*
* Each devfreq-event device is described with a this structure.
* This structure contains the various data for devfreq-event device.
* The event_type describes what is going to be counted in the register.
* It might choose to count e.g. read requests, write data in bytes, etc.
* The full supported list of types is present in specyfic header in:
* include/dt-bindings/pmu/.
*/
struct devfreq_event_desc {
const char *name;
u32 event_type;
void *driver_data;
const struct devfreq_event_ops *ops;
};
#if defined(CONFIG_PM_DEVFREQ_EVENT)
extern int devfreq_event_enable_edev(struct devfreq_event_dev *edev);
extern int devfreq_event_disable_edev(struct devfreq_event_dev *edev);
extern bool devfreq_event_is_enabled(struct devfreq_event_dev *edev);
extern int devfreq_event_set_event(struct devfreq_event_dev *edev);
extern int devfreq_event_get_event(struct devfreq_event_dev *edev,
struct devfreq_event_data *edata);
extern int devfreq_event_reset_event(struct devfreq_event_dev *edev);
extern struct devfreq_event_dev *devfreq_event_get_edev_by_phandle(
struct device *dev, int index);
extern int devfreq_event_get_edev_count(struct device *dev);
extern struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
struct devfreq_event_desc *desc);
extern int devfreq_event_remove_edev(struct devfreq_event_dev *edev);
extern struct devfreq_event_dev *devm_devfreq_event_add_edev(struct device *dev,
struct devfreq_event_desc *desc);
extern void devm_devfreq_event_remove_edev(struct device *dev,
struct devfreq_event_dev *edev);
static inline void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev)
{
return edev->desc->driver_data;
}
#else
static inline int devfreq_event_enable_edev(struct devfreq_event_dev *edev)
{
return -EINVAL;
}
static inline int devfreq_event_disable_edev(struct devfreq_event_dev *edev)
{
return -EINVAL;
}
static inline bool devfreq_event_is_enabled(struct devfreq_event_dev *edev)
{
return false;
}
static inline int devfreq_event_set_event(struct devfreq_event_dev *edev)
{
return -EINVAL;
}
static inline int devfreq_event_get_event(struct devfreq_event_dev *edev,
struct devfreq_event_data *edata)
{
return -EINVAL;
}
static inline int devfreq_event_reset_event(struct devfreq_event_dev *edev)
{
return -EINVAL;
}
static inline struct devfreq_event_dev *devfreq_event_get_edev_by_phandle(
struct device *dev, int index)
{
return ERR_PTR(-EINVAL);
}
static inline int devfreq_event_get_edev_count(struct device *dev)
{
return -EINVAL;
}
static inline struct devfreq_event_dev *devfreq_event_add_edev(struct device *dev,
struct devfreq_event_desc *desc)
{
return ERR_PTR(-EINVAL);
}
static inline int devfreq_event_remove_edev(struct devfreq_event_dev *edev)
{
return -EINVAL;
}
static inline struct devfreq_event_dev *devm_devfreq_event_add_edev(
struct device *dev,
struct devfreq_event_desc *desc)
{
return ERR_PTR(-EINVAL);
}
static inline void devm_devfreq_event_remove_edev(struct device *dev,
struct devfreq_event_dev *edev)
{
}
static inline void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev)
{
return NULL;
}
#endif /* CONFIG_PM_DEVFREQ_EVENT */
#endif /* __LINUX_DEVFREQ_EVENT_H__ */
|
