1 /*
2 * Copyright (c) 2014 Intel Corporation All Rights Reserved
3 * Copyright (C) 2012 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <sys/types.h>
23 #include <sys/stat.h>
24
25 //#define LOG_NDEBUG 0
26 #define LOG_TAG "IntelPowerHAL"
27 #include <utils/Log.h>
28
29 #include <hardware/hardware.h>
30 #include <hardware/power.h>
31
32 #define BOOST_PULSE_SYSFS "/sys/devices/system/cpu/cpufreq/interactive/boostpulse"
33 #define BOOST_FREQ_SYSFS "/sys/devices/system/cpu/cpufreq/interactive/hispeed_freq"
34 #define BOOST_DURATION_SYSFS "/sys/devices/system/cpu/cpufreq/interactive/boostpulse_duration"
35
36 struct intel_power_module {
37 struct power_module container;
38 uint32_t pulse_duration;
39 struct timespec last_boost_time; /* latest POWER_HINT_INTERACTION boost */
40 };
41
sysfs_write(char * path,char * s)42 static ssize_t sysfs_write(char *path, char *s)
43 {
44 char buf[80];
45 ssize_t len;
46 int fd = open(path, O_WRONLY);
47
48 if (fd < 0) {
49 strerror_r(errno, buf, sizeof(buf));
50 ALOGE("Error opening %s: %s\n", path, buf);
51 return -1;
52 }
53
54 if ((len = write(fd, s, strlen(s))) < 0) {
55 strerror_r(errno, buf, sizeof(buf));
56 ALOGE("Error writing to %s: %s\n", path, buf);
57 }
58
59 close(fd);
60 ALOGV("wrote '%s' to %s", s, path);
61
62 return len;
63 }
64
sysfs_read(char * path,char * s,int num_bytes)65 static ssize_t sysfs_read(char *path, char *s, int num_bytes)
66 {
67 char buf[80];
68 ssize_t count;
69 int fd = open(path, O_RDONLY);
70
71 if (fd < 0) {
72 strerror_r(errno, buf, sizeof(buf));
73 ALOGE("Error reading from %s: %s\n", path, buf);
74 return -1;
75 }
76
77 if ((count = read(fd, s, (num_bytes - 1))) < 0) {
78 strerror_r(errno, buf, sizeof(buf));
79 ALOGE("Error reading from %s: %s\n", path, buf);
80 } else {
81 if ((count >= 1) && (s[count-1] == '\n')) {
82 s[count-1] = '\0';
83 } else {
84 s[count] = '\0';
85 }
86 }
87
88 close(fd);
89 ALOGV("read '%s' from %s", s, path);
90
91 return count;
92 }
93
fugu_power_init(struct power_module * module)94 static void fugu_power_init(struct power_module *module)
95 {
96 struct intel_power_module *mod = (struct intel_power_module *) module;
97 char boost_freq[32];
98 char boostpulse_duration[32];
99
100 /* Keep default boost_freq for fugu => max freq */
101
102 if (sysfs_read(BOOST_FREQ_SYSFS, boost_freq, 32) < 0) {
103 strcpy(boost_freq, "?");
104 }
105 if (sysfs_read(BOOST_DURATION_SYSFS, boostpulse_duration, 32) < 0) {
106 /* above should not fail but just in case it does use an arbitrary 20ms value */
107 snprintf(boostpulse_duration, 32, "%d", 20000);
108 }
109 mod->pulse_duration = atoi(boostpulse_duration);
110 /* initialize last_boost_time */
111 clock_gettime(CLOCK_MONOTONIC, &mod->last_boost_time);
112
113 ALOGI("init done: will boost CPU to %skHz for %dus on input events",
114 boost_freq, mod->pulse_duration);
115 }
116
fugu_power_set_interactive(struct power_module * module,int on)117 static void fugu_power_set_interactive(struct power_module *module, int on)
118 {
119 ALOGI("setInteractive: on=%d", on);
120 (void) module; /* unused */
121 (void) on; /* unused */
122 }
123
timespec_sub(struct timespec * res,struct timespec * a,struct timespec * b)124 static inline void timespec_sub(struct timespec *res, struct timespec *a, struct timespec *b)
125 {
126 res->tv_sec = a->tv_sec - b->tv_sec;
127 if (a->tv_sec >= b->tv_sec) {
128 res->tv_nsec = a->tv_nsec - b->tv_nsec;
129 } else {
130 res->tv_nsec = 1000000000 - b->tv_nsec + a->tv_nsec;
131 res->tv_sec--;
132 }
133 }
134
timespec_to_us(struct timespec * t)135 static inline uint64_t timespec_to_us(struct timespec *t)
136 {
137 return t->tv_sec * 1000000 + t->tv_nsec / 1000;
138 }
139
fugu_power_hint(struct power_module * module,power_hint_t hint,void * data)140 static void fugu_power_hint(struct power_module *module, power_hint_t hint, void *data)
141 {
142 struct intel_power_module *mod = (struct intel_power_module *) module;
143 struct timespec curr_time;
144 struct timespec diff_time;
145 uint64_t diff;
146
147 (void) data;
148
149 switch (hint) {
150 case POWER_HINT_INTERACTION:
151 clock_gettime(CLOCK_MONOTONIC, &curr_time);
152 timespec_sub(&diff_time, &curr_time, &mod->last_boost_time);
153 diff = timespec_to_us(&diff_time);
154
155 ALOGV("POWER_HINT_INTERACTION: diff=%llu", diff);
156
157 if (diff > mod->pulse_duration) {
158 sysfs_write(BOOST_PULSE_SYSFS, "1");
159 mod->last_boost_time = curr_time;
160 }
161 break;
162 case POWER_HINT_VSYNC:
163 break;
164 default:
165 break;
166 }
167 }
168
169 static struct hw_module_methods_t power_module_methods = {
170 .open = NULL,
171 };
172
173 struct intel_power_module HAL_MODULE_INFO_SYM = {
174 container:{
175 common: {
176 tag: HARDWARE_MODULE_TAG,
177 module_api_version: POWER_MODULE_API_VERSION_0_2,
178 hal_api_version: HARDWARE_HAL_API_VERSION,
179 id: POWER_HARDWARE_MODULE_ID,
180 name: "Fugu Power HAL",
181 author: "Intel",
182 methods: &power_module_methods,
183 },
184 init: fugu_power_init,
185 setInteractive: fugu_power_set_interactive,
186 powerHint: fugu_power_hint,
187 },
188 };
189