Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <errno.h> |
| 18 | #include <fcntl.h> |
Colin Cross | f25dd87 | 2012-06-14 12:55:47 -0700 | [diff] [blame] | 19 | #include <pthread.h> |
| 20 | #include <stdbool.h> |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 21 | #include <stddef.h> |
| 22 | #include <string.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <unistd.h> |
| 26 | |
| 27 | #define LOG_TAG "libsuspend" |
| 28 | #include <cutils/log.h> |
| 29 | |
| 30 | #include "autosuspend_ops.h" |
| 31 | |
| 32 | #define EARLYSUSPEND_SYS_POWER_STATE "/sys/power/state" |
| 33 | #define EARLYSUSPEND_WAIT_FOR_FB_SLEEP "/sys/power/wait_for_fb_sleep" |
| 34 | #define EARLYSUSPEND_WAIT_FOR_FB_WAKE "/sys/power/wait_for_fb_wake" |
| 35 | |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 36 | static int sPowerStatefd; |
| 37 | static const char *pwr_state_mem = "mem"; |
| 38 | static const char *pwr_state_on = "on"; |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 39 | static pthread_t earlysuspend_thread; |
Colin Cross | f25dd87 | 2012-06-14 12:55:47 -0700 | [diff] [blame] | 40 | static pthread_mutex_t earlysuspend_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 41 | static pthread_cond_t earlysuspend_cond = PTHREAD_COND_INITIALIZER; |
| 42 | static bool wait_for_earlysuspend; |
| 43 | static enum { |
| 44 | EARLYSUSPEND_ON, |
| 45 | EARLYSUSPEND_MEM, |
| 46 | } earlysuspend_state = EARLYSUSPEND_ON; |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 47 | |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 48 | int wait_for_fb_wake(void) |
| 49 | { |
| 50 | int err = 0; |
| 51 | char buf; |
| 52 | int fd = open(EARLYSUSPEND_WAIT_FOR_FB_WAKE, O_RDONLY, 0); |
| 53 | // if the file doesn't exist, the error will be caught in read() below |
| 54 | do { |
| 55 | err = read(fd, &buf, 1); |
| 56 | } while (err < 0 && errno == EINTR); |
| 57 | ALOGE_IF(err < 0, |
| 58 | "*** ANDROID_WAIT_FOR_FB_WAKE failed (%s)", strerror(errno)); |
| 59 | close(fd); |
| 60 | return err < 0 ? err : 0; |
| 61 | } |
| 62 | |
| 63 | static int wait_for_fb_sleep(void) |
| 64 | { |
| 65 | int err = 0; |
| 66 | char buf; |
| 67 | int fd = open(EARLYSUSPEND_WAIT_FOR_FB_SLEEP, O_RDONLY, 0); |
| 68 | // if the file doesn't exist, the error will be caught in read() below |
| 69 | do { |
| 70 | err = read(fd, &buf, 1); |
| 71 | } while (err < 0 && errno == EINTR); |
| 72 | ALOGE_IF(err < 0, |
| 73 | "*** ANDROID_WAIT_FOR_FB_SLEEP failed (%s)", strerror(errno)); |
| 74 | close(fd); |
| 75 | return err < 0 ? err : 0; |
| 76 | } |
| 77 | |
Sasha Levitskiy | cdc1cfb | 2014-04-10 17:10:21 -0700 | [diff] [blame] | 78 | static void *earlysuspend_thread_func(void __unused *arg) |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 79 | { |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 80 | while (1) { |
| 81 | if (wait_for_fb_sleep()) { |
| 82 | ALOGE("Failed reading wait_for_fb_sleep, exiting earlysuspend thread\n"); |
| 83 | return NULL; |
| 84 | } |
Colin Cross | f25dd87 | 2012-06-14 12:55:47 -0700 | [diff] [blame] | 85 | pthread_mutex_lock(&earlysuspend_mutex); |
| 86 | earlysuspend_state = EARLYSUSPEND_MEM; |
| 87 | pthread_cond_signal(&earlysuspend_cond); |
| 88 | pthread_mutex_unlock(&earlysuspend_mutex); |
| 89 | |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 90 | if (wait_for_fb_wake()) { |
| 91 | ALOGE("Failed reading wait_for_fb_wake, exiting earlysuspend thread\n"); |
| 92 | return NULL; |
| 93 | } |
Colin Cross | f25dd87 | 2012-06-14 12:55:47 -0700 | [diff] [blame] | 94 | pthread_mutex_lock(&earlysuspend_mutex); |
| 95 | earlysuspend_state = EARLYSUSPEND_ON; |
| 96 | pthread_cond_signal(&earlysuspend_cond); |
| 97 | pthread_mutex_unlock(&earlysuspend_mutex); |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 98 | } |
| 99 | } |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 100 | static int autosuspend_earlysuspend_enable(void) |
| 101 | { |
| 102 | char buf[80]; |
| 103 | int ret; |
| 104 | |
| 105 | ALOGV("autosuspend_earlysuspend_enable\n"); |
| 106 | |
| 107 | ret = write(sPowerStatefd, pwr_state_mem, strlen(pwr_state_mem)); |
| 108 | if (ret < 0) { |
| 109 | strerror_r(errno, buf, sizeof(buf)); |
| 110 | ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf); |
| 111 | goto err; |
| 112 | } |
| 113 | |
Colin Cross | f25dd87 | 2012-06-14 12:55:47 -0700 | [diff] [blame] | 114 | if (wait_for_earlysuspend) { |
| 115 | pthread_mutex_lock(&earlysuspend_mutex); |
| 116 | while (earlysuspend_state != EARLYSUSPEND_MEM) { |
| 117 | pthread_cond_wait(&earlysuspend_cond, &earlysuspend_mutex); |
| 118 | } |
| 119 | pthread_mutex_unlock(&earlysuspend_mutex); |
| 120 | } |
| 121 | |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 122 | ALOGV("autosuspend_earlysuspend_enable done\n"); |
| 123 | |
| 124 | return 0; |
| 125 | |
| 126 | err: |
| 127 | return ret; |
| 128 | } |
| 129 | |
| 130 | static int autosuspend_earlysuspend_disable(void) |
| 131 | { |
| 132 | char buf[80]; |
| 133 | int ret; |
| 134 | |
| 135 | ALOGV("autosuspend_earlysuspend_disable\n"); |
| 136 | |
| 137 | ret = write(sPowerStatefd, pwr_state_on, strlen(pwr_state_on)); |
| 138 | if (ret < 0) { |
| 139 | strerror_r(errno, buf, sizeof(buf)); |
| 140 | ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf); |
| 141 | goto err; |
| 142 | } |
| 143 | |
Colin Cross | f25dd87 | 2012-06-14 12:55:47 -0700 | [diff] [blame] | 144 | if (wait_for_earlysuspend) { |
| 145 | pthread_mutex_lock(&earlysuspend_mutex); |
| 146 | while (earlysuspend_state != EARLYSUSPEND_ON) { |
| 147 | pthread_cond_wait(&earlysuspend_cond, &earlysuspend_mutex); |
| 148 | } |
| 149 | pthread_mutex_unlock(&earlysuspend_mutex); |
| 150 | } |
| 151 | |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 152 | ALOGV("autosuspend_earlysuspend_disable done\n"); |
| 153 | |
| 154 | return 0; |
| 155 | |
| 156 | err: |
| 157 | return ret; |
| 158 | } |
| 159 | |
| 160 | struct autosuspend_ops autosuspend_earlysuspend_ops = { |
| 161 | .enable = autosuspend_earlysuspend_enable, |
| 162 | .disable = autosuspend_earlysuspend_disable, |
| 163 | }; |
| 164 | |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 165 | void start_earlysuspend_thread(void) |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 166 | { |
| 167 | char buf[80]; |
| 168 | int ret; |
| 169 | |
| 170 | ret = access(EARLYSUSPEND_WAIT_FOR_FB_SLEEP, F_OK); |
| 171 | if (ret < 0) { |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 172 | return; |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 173 | } |
| 174 | |
| 175 | ret = access(EARLYSUSPEND_WAIT_FOR_FB_WAKE, F_OK); |
| 176 | if (ret < 0) { |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 177 | return; |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 178 | } |
| 179 | |
Colin Cross | f25dd87 | 2012-06-14 12:55:47 -0700 | [diff] [blame] | 180 | wait_for_fb_wake(); |
| 181 | |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 182 | ALOGI("Starting early suspend unblocker thread\n"); |
| 183 | ret = pthread_create(&earlysuspend_thread, NULL, earlysuspend_thread_func, NULL); |
| 184 | if (ret) { |
Colin Cross | f25dd87 | 2012-06-14 12:55:47 -0700 | [diff] [blame] | 185 | strerror_r(errno, buf, sizeof(buf)); |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 186 | ALOGE("Error creating thread: %s\n", buf); |
Colin Cross | f25dd87 | 2012-06-14 12:55:47 -0700 | [diff] [blame] | 187 | return; |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 188 | } |
Colin Cross | f25dd87 | 2012-06-14 12:55:47 -0700 | [diff] [blame] | 189 | |
| 190 | wait_for_earlysuspend = true; |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | struct autosuspend_ops *autosuspend_earlysuspend_init(void) |
| 194 | { |
| 195 | char buf[80]; |
| 196 | int ret; |
| 197 | |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 198 | sPowerStatefd = open(EARLYSUSPEND_SYS_POWER_STATE, O_RDWR); |
| 199 | |
| 200 | if (sPowerStatefd < 0) { |
| 201 | strerror_r(errno, buf, sizeof(buf)); |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 202 | ALOGW("Error opening %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf); |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 203 | return NULL; |
| 204 | } |
| 205 | |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 206 | ret = write(sPowerStatefd, "on", 2); |
| 207 | if (ret < 0) { |
| 208 | strerror_r(errno, buf, sizeof(buf)); |
| 209 | ALOGW("Error writing 'on' to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf); |
| 210 | goto err_write; |
| 211 | } |
| 212 | |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 213 | ALOGI("Selected early suspend\n"); |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 214 | |
| 215 | start_earlysuspend_thread(); |
| 216 | |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 217 | return &autosuspend_earlysuspend_ops; |
Colin Cross | 2146b7f | 2012-06-07 14:12:54 -0700 | [diff] [blame] | 218 | |
| 219 | err_write: |
| 220 | close(sPowerStatefd); |
| 221 | return NULL; |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 222 | } |