Initial Contribution
diff --git a/power/power.c b/power/power.c
new file mode 100644
index 0000000..907726a
--- /dev/null
+++ b/power/power.c
@@ -0,0 +1,204 @@
+#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;
+}
+
+