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
|
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define LOG_TAG "Tuna PowerHAL"
#include <utils/Log.h>
#include <hardware/hardware.h>
#include <hardware/power.h>
/*
* Tuna uses the legacy interface for requesting early suspend and late resume.
*/
#define LEGACY_SYS_POWER_STATE "/sys/power/state"
static int sPowerStatefd;
static const char *pwr_states[] = { "mem", "on" };
#define BOOST_PATH "/sys/devices/system/cpu/cpufreq/interactive/boost"
static int boost_fd = -1;
static int boost_warned;
static void sysfs_write(char *path, char *s)
{
char buf[80];
int len;
int fd = open(path, O_WRONLY);
if (fd < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening %s: %s\n", path, buf);
return;
}
len = write(fd, s, strlen(s));
if (len < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", path, buf);
}
close(fd);
}
static void tuna_power_init(struct power_module *module)
{
char buf[80];
sPowerStatefd = open(LEGACY_SYS_POWER_STATE, O_RDWR);
if (sPowerStatefd < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening %s: %s\n", LEGACY_SYS_POWER_STATE, buf);
}
/*
* cpufreq interactive governor: timer 20ms, min sample 100ms,
* hispeed 700MHz at load 40%
*/
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/timer_rate",
"20000");
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/min_sample_time",
"100000");
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/hispeed_freq",
"700000");
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/go_hispeed_load",
"40");
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay",
"100000");
}
static void tuna_power_set_interactive(struct power_module *module, int on)
{
char buf[80];
int len;
/*
* Lower maximum frequency when screen is off. CPU 0 and 1 share a
* cpufreq policy.
*/
sysfs_write("/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq",
on ? "1200000" : "700000");
len = write(sPowerStatefd, pwr_states[!!on], strlen(pwr_states[!!on]));
if (len < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", LEGACY_SYS_POWER_STATE, buf);
}
}
static void tuna_power_hint(struct power_module *module, power_hint_t hint,
void *data)
{
char buf[80];
int len;
switch (hint) {
case POWER_HINT_VSYNC:
if (boost_fd < 0)
boost_fd = open(BOOST_PATH, O_WRONLY);
if (boost_fd < 0) {
if (!boost_warned) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening %s: %s\n", BOOST_PATH, buf);
boost_warned = 1;
}
break;
}
len = write(boost_fd, (int) data ? "1" : "0", 1);
if (len < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", BOOST_PATH, buf);
}
break;
default:
break;
}
}
static struct hw_module_methods_t power_module_methods = {
.open = NULL,
};
struct power_module HAL_MODULE_INFO_SYM = {
.common = {
.tag = HARDWARE_MODULE_TAG,
.module_api_version = POWER_MODULE_API_VERSION_0_2,
.hal_api_version = HARDWARE_HAL_API_VERSION,
.id = POWER_HARDWARE_MODULE_ID,
.name = "Tuna Power HAL",
.author = "The Android Open Source Project",
.methods = &power_module_methods,
},
.init = tuna_power_init,
.setInteractive = tuna_power_set_interactive,
.powerHint = tuna_power_hint,
};
|
