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      1 /*
      2  * Copyright (C) 2008 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 #include <hardware_legacy/power.h>
     17 #include <fcntl.h>
     18 #include <errno.h>
     19 #include <stdlib.h>
     20 #include <stdio.h>
     21 #include <unistd.h>
     22 #include <sys/time.h>
     23 #include <time.h>
     24 #include <errno.h>
     25 #include <string.h>
     26 #include <sys/stat.h>
     27 #include <sys/types.h>
     28 #include <pthread.h>
     29 
     30 #define LOG_TAG "power"
     31 #include <utils/Log.h>
     32 
     33 #include "qemu.h"
     34 #ifdef QEMU_POWER
     35 #include "power_qemu.h"
     36 #endif
     37 
     38 enum {
     39     ACQUIRE_PARTIAL_WAKE_LOCK = 0,
     40     RELEASE_WAKE_LOCK,
     41     REQUEST_STATE,
     42     OUR_FD_COUNT
     43 };
     44 
     45 const char * const OLD_PATHS[] = {
     46     "/sys/android_power/acquire_partial_wake_lock",
     47     "/sys/android_power/release_wake_lock",
     48     "/sys/android_power/request_state"
     49 };
     50 
     51 const char * const NEW_PATHS[] = {
     52     "/sys/power/wake_lock",
     53     "/sys/power/wake_unlock",
     54     "/sys/power/state"
     55 };
     56 
     57 const char * const AUTO_OFF_TIMEOUT_DEV = "/sys/android_power/auto_off_timeout";
     58 
     59 //XXX static pthread_once_t g_initialized = THREAD_ONCE_INIT;
     60 static int g_initialized = 0;
     61 static int g_fds[OUR_FD_COUNT];
     62 static int g_error = 1;
     63 
     64 static const char *off_state = "mem";
     65 static const char *on_state = "on";
     66 
     67 static int64_t systemTime()
     68 {
     69     struct timespec t;
     70     t.tv_sec = t.tv_nsec = 0;
     71     clock_gettime(CLOCK_MONOTONIC, &t);
     72     return t.tv_sec*1000000000LL + t.tv_nsec;
     73 }
     74 
     75 static int
     76 open_file_descriptors(const char * const paths[])
     77 {
     78     int i;
     79     for (i=0; i<OUR_FD_COUNT; i++) {
     80         int fd = open(paths[i], O_RDWR);
     81         if (fd < 0) {
     82             fprintf(stderr, "fatal error opening \"%s\"\n", paths[i]);
     83             g_error = errno;
     84             return -1;
     85         }
     86         g_fds[i] = fd;
     87     }
     88 
     89     g_error = 0;
     90     return 0;
     91 }
     92 
     93 static inline void
     94 initialize_fds(void)
     95 {
     96     // XXX: should be this:
     97     //pthread_once(&g_initialized, open_file_descriptors);
     98     // XXX: not this:
     99     if (g_initialized == 0) {
    100         if(open_file_descriptors(NEW_PATHS) < 0) {
    101             open_file_descriptors(OLD_PATHS);
    102             on_state = "wake";
    103             off_state = "standby";
    104         }
    105         g_initialized = 1;
    106     }
    107 }
    108 
    109 int
    110 acquire_wake_lock(int lock, const char* id)
    111 {
    112     initialize_fds();
    113 
    114 //    LOGI("acquire_wake_lock lock=%d id='%s'\n", lock, id);
    115 
    116     if (g_error) return g_error;
    117 
    118     int fd;
    119 
    120     if (lock == PARTIAL_WAKE_LOCK) {
    121         fd = g_fds[ACQUIRE_PARTIAL_WAKE_LOCK];
    122     }
    123     else {
    124         return EINVAL;
    125     }
    126 
    127     return write(fd, id, strlen(id));
    128 }
    129 
    130 int
    131 release_wake_lock(const char* id)
    132 {
    133     initialize_fds();
    134 
    135 //    LOGI("release_wake_lock id='%s'\n", id);
    136 
    137     if (g_error) return g_error;
    138 
    139     ssize_t len = write(g_fds[RELEASE_WAKE_LOCK], id, strlen(id));
    140     return len >= 0;
    141 }
    142 
    143 int
    144 set_last_user_activity_timeout(int64_t delay)
    145 {
    146 //    LOGI("set_last_user_activity_timeout delay=%d\n", ((int)(delay)));
    147 
    148     int fd = open(AUTO_OFF_TIMEOUT_DEV, O_RDWR);
    149     if (fd >= 0) {
    150         char buf[32];
    151         ssize_t len;
    152         len = snprintf(buf, sizeof(buf), "%d", ((int)(delay)));
    153         buf[sizeof(buf) - 1] = '\0';
    154         len = write(fd, buf, len);
    155         close(fd);
    156         return 0;
    157     } else {
    158         return errno;
    159     }
    160 }
    161 
    162 int
    163 set_screen_state(int on)
    164 {
    165     QEMU_FALLBACK(set_screen_state(on));
    166 
    167     LOGI("*** set_screen_state %d", on);
    168 
    169     initialize_fds();
    170 
    171     //LOGI("go_to_sleep eventTime=%lld now=%lld g_error=%s\n", eventTime,
    172       //      systemTime(), strerror(g_error));
    173 
    174     if (g_error) return g_error;
    175 
    176     char buf[32];
    177     int len;
    178     if(on)
    179         len = snprintf(buf, sizeof(buf), "%s", on_state);
    180     else
    181         len = snprintf(buf, sizeof(buf), "%s", off_state);
    182 
    183     buf[sizeof(buf) - 1] = '\0';
    184     len = write(g_fds[REQUEST_STATE], buf, len);
    185     if(len < 0) {
    186         LOGE("Failed setting last user activity: g_error=%d\n", g_error);
    187     }
    188     return 0;
    189 }
    190