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| 1 | #include <errno.h> |
| 2 | #include <fcntl.h> |
| 3 | #include <stdio.h> |
| 4 | #include <string.h> |
| 5 | #include <unistd.h> |
| 6 | |
| 7 | #include "powersaver.h" |
| 8 | #include "debug.h" |
| 9 | PowerSaver* PowerSaver::instance = NULL; |
| 10 | Uint32 screenTimerCallback(Uint32 interval, void *param) |
| 11 | { |
| 12 | DEBUG("Disable Backlight Event\n"); |
| 13 | PowerSaver::getInstance()->disableScreen(); |
| 14 | return 0; |
| 15 | } |
| 16 | |
| 17 | PowerSaver* PowerSaver::getInstance() { |
| 18 | if ( instance == NULL ) { |
| 19 | instance = new PowerSaver(); |
| 20 | } |
| 21 | return instance; |
| 22 | } |
| 23 | |
| 24 | PowerSaver::PowerSaver( ) { |
| 25 | setScreenTimeout(0); |
| 26 | screenTimer = NULL; |
| 27 | } |
| 28 | |
| 29 | PowerSaver::~PowerSaver() { |
| 30 | SDL_RemoveTimer(screenTimer); |
| 31 | } |
| 32 | |
| 33 | void PowerSaver::setScreenTimeout( unsigned int seconds ) { |
| 34 | screenTimeout = seconds; |
| 35 | resetScreenTimer(); |
| 36 | } |
| 37 | |
| 38 | void PowerSaver::resetScreenTimer() { |
| 39 | if ( screenTimer != NULL ) { |
| 40 | SDL_RemoveTimer(screenTimer); |
| 41 | } |
| 42 | addScreenTimer(); |
| 43 | //If display is off, turn on it |
| 44 | if ( !screenState ) { |
| 45 | enableScreen(); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | void PowerSaver::addScreenTimer() { |
| 50 | //if timeout is zero, don't set timeout |
| 51 | if ( screenTimeout == 0 ) { |
| 52 | screenTimer = NULL; |
| 53 | return; |
| 54 | } |
| 55 | screenTimer = SDL_AddTimer(screenTimeout*1000, screenTimerCallback,NULL); |
| 56 | if ( screenTimer == NULL ) { |
| 57 | ERROR("Could not initialize SDLTimer: %s\n", SDL_GetError()); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | #define SCREEN_BLANK_PATH "/sys/class/graphics/fb0/blank" |
| 62 | void PowerSaver::setScreenBlanking( bool state ) { |
| 63 | const char* path = SCREEN_BLANK_PATH; |
| 64 | const char* blank = state ? "0" : "1"; |
| 65 | |
| 66 | int fd = open(path, O_RDWR); |
| 67 | if (fd == -1) { |
| 68 | WARNING("Failed to open '%s': %s\n", path, strerror(errno)); |
| 69 | } else { |
| 70 | ssize_t written = write(fd, blank, strlen(blank)); |
| 71 | if (written == -1) { |
| 72 | WARNING("Error writing '%s': %s\n", path, strerror(errno)); |
| 73 | } |
| 74 | close(fd); |
| 75 | } |
| 76 | screenState = state; |
| 77 | } |
| 78 | |
| 79 | void PowerSaver::enableScreen() { |
| 80 | if ( !screenState ) { |
| 81 | setScreenBlanking(true); |
| 82 | } |
| 83 | } |
| 84 | void PowerSaver::disableScreen() { |
| 85 | if ( screenState ) { |
| 86 | setScreenBlanking(false); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | |
| 91 |
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