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#include <hardware/power.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <pthread.h>
#define LOG_TAG "power"
#include <utils/Log.h>
enum {
ACQUIRE_PARTIAL_WAKE_LOCK = 0,
ACQUIRE_FULL_WAKE_LOCK,
RELEASE_WAKE_LOCK,
REQUEST_STATE,
OUR_FD_COUNT
};
const char * const PATHS[] = {
"/sys/android_power/acquire_partial_wake_lock",
"/sys/android_power/acquire_full_wake_lock",
"/sys/android_power/release_wake_lock",
"/sys/android_power/request_state"
};
const char * const AUTO_OFF_TIMEOUT_DEV = "/sys/android_power/auto_off_timeout";
const char * const LCD_BACKLIGHT = "/sys/class/leds/lcd-backlight/brightness";
const char * const BUTTON_BACKLIGHT = "/sys/class/leds/button-backlight/brightness";
const char * const KEYBOARD_BACKLIGHT = "/sys/class/leds/keyboard-backlight/brightness";
//XXX static pthread_once_t g_initialized = THREAD_ONCE_INIT;
static int g_initialized = 0;
static int g_fds[OUR_FD_COUNT];
static int g_error = 1;
static int64_t systemTime()
{
struct timespec t;
t.tv_sec = t.tv_nsec = 0;
clock_gettime(CLOCK_MONOTONIC, &t);
return t.tv_sec*1000000000LL + t.tv_nsec;
}
static void
open_file_descriptors(void)
{
int i;
for (i=0; i<OUR_FD_COUNT; i++) {
int fd = open(PATHS[i], O_RDWR);
if (fd < 0) {
fprintf(stderr, "fatal error opening \"%s\"\n", PATHS[i]);
g_error = errno;
return;
}
g_fds[i] = fd;
}
g_error = 0;
}
static inline void
initialize_fds(void)
{
// XXX: should be this:
//pthread_once(&g_initialized, open_file_descriptors);
// XXX: not this:
if (g_initialized == 0) {
open_file_descriptors();
g_initialized = 1;
}
}
int
acquire_wake_lock(int lock, const char* id)
{
initialize_fds();
// LOGI("acquire_wake_lock lock=%d id='%s'\n", lock, id);
if (g_error) return g_error;
int fd;
if (lock == PARTIAL_WAKE_LOCK) {
fd = g_fds[ACQUIRE_PARTIAL_WAKE_LOCK];
}
else if (lock == FULL_WAKE_LOCK) {
fd = g_fds[ACQUIRE_FULL_WAKE_LOCK];
}
else {
return EINVAL;
}
return write(fd, id, strlen(id));
}
int
release_wake_lock(const char* id)
{
initialize_fds();
// LOGI("release_wake_lock id='%s'\n", id);
if (g_error) return g_error;
ssize_t len = write(g_fds[RELEASE_WAKE_LOCK], id, strlen(id));
return len >= 0;
}
int
set_last_user_activity_timeout(int64_t delay)
{
// LOGI("set_last_user_activity_timeout delay=%d\n", ((int)(delay)));
int fd = open(AUTO_OFF_TIMEOUT_DEV, O_RDWR);
if (fd >= 0) {
char buf[32];
ssize_t len;
len = sprintf(buf, "%d", ((int)(delay)));
len = write(fd, buf, len);
close(fd);
return 0;
} else {
return errno;
}
}
static void
set_a_light(const char* path, int value)
{
int fd;
// LOGI("set_a_light(%s, %d)\n", path, value);
fd = open(path, O_RDWR);
if (fd) {
char buffer[20];
int bytes = sprintf(buffer, "%d\n", value);
write(fd, buffer, bytes);
close(fd);
} else {
LOGE("set_a_light failed to open %s\n", path);
}
}
int
set_light_brightness(unsigned int mask, unsigned int brightness)
{
initialize_fds();
// LOGI("set_light_brightness mask=0x%08x brightness=%d now=%lld g_error=%s\n",
// mask, brightness, systemTime(), strerror(g_error));
if (mask & KEYBOARD_LIGHT) {
set_a_light(KEYBOARD_BACKLIGHT, brightness);
}
if (mask & SCREEN_LIGHT) {
set_a_light(LCD_BACKLIGHT, brightness);
}
if (mask & BUTTON_LIGHT) {
set_a_light(BUTTON_BACKLIGHT, brightness);
}
return 0;
}
int
set_screen_state(int on)
{
//LOGI("*** set_screen_state %d", on);
initialize_fds();
//LOGI("go_to_sleep eventTime=%lld now=%lld g_error=%s\n", eventTime,
// systemTime(), strerror(g_error));
if (g_error) return g_error;
char buf[32];
int len;
if(on)
len = sprintf(buf, "wake");
else
len = sprintf(buf, "standby");
len = write(g_fds[REQUEST_STATE], buf, len);
if(len < 0) {
LOGE("Failed setting last user activity: g_error=%d\n", g_error);
}
return 0;
}
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