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/**
* PlayLPM
*
* Copyright (C) 2012 Paul Kocialkowski <contact@paulk.fr>
*
* playlpm is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* playlpm is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with playlpm. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define LOG_TAG "PlayLPM"
#include <cutils/log.h>
#define LPM_LOOP_DELAY 5
#define LPM_FRAMES_DIR "/system/media/charging"
#define LPM_FRAMES_PREFIX "charging-"
#define LPM_FRAMES_SUFFIX ".bgra"
void lpm_display_level(int level)
{
char *frame_file;
unsigned char *frame_data;
int frame_size = -1;
struct stat frame_stat;
int fd = -1;
memset(&frame_stat, 0, sizeof(frame_stat));
asprintf(&frame_file, "%s/%s%d%s", LPM_FRAMES_DIR, LPM_FRAMES_PREFIX, level, LPM_FRAMES_SUFFIX);
LOGD("frame file is: %s\n", frame_file);
stat(frame_file, &frame_stat);
frame_size = frame_stat.st_size;
if(frame_size < 0)
{
LOGE("Wrong frame size, aborting");
return;
}
fd = open(frame_file, O_RDONLY);
free(frame_file);
if(fd < 0)
{
LOGE("Failed to open frame file, aborting");
return;
}
frame_data = malloc(frame_size);
read(fd, frame_data, frame_size);
close(fd);
fd = open("/dev/graphics/fb0", O_WRONLY);
if(fd < 0)
{
LOGE("Failed to open framebuffer node, aborting");
return;
}
LOGD("Writing frame for level: %d", level);
write(fd, frame_data, frame_size);
close(fd);
free(frame_data);
}
int lpm_battery_level(void)
{
int capacity = -1;
int level = -1;
int fd = -1;
int c = -1;
char value[3];
char status[6];
fd = open("/sys/class/power_supply/battery/capacity", O_RDONLY);
if(fd < 0)
{
LOGE("Failed to open capacity node, aborting");
return 0;
}
c = read(fd, value, sizeof(value));
value[c] = '\0';
close(fd);
capacity = atoi(value);
if(capacity < 0 || capacity > 100)
{
LOGE("capacity value (%d) is unreliable, aborting", capacity);
return 0;
}
// Truncate capacity to get a multiple of 10 as level
level = ((capacity - (capacity % 10)) / 10) * 10;
fd = open("/sys/class/power_supply/battery/status", O_RDONLY);
if(fd < 0)
{
LOGE("Failed to open status node, aborting");
return 0;
}
read(fd, status, sizeof(status));
close(fd);
// If status is reported as Full, assume 100% charged
if(strncmp(status, "Full", 4) == 0)
{
level = 100;
}
LOGD("level is: %d\n", level);
return level;
}
void lpm_backlight_brightness(char *brightness)
{
int fd = -1;
int length;
if(brightness == NULL)
{
LOGE("brightness isn't set, aborting");
return;
}
fd = open("/sys/class/backlight/s5p_bl/brightness", O_WRONLY);
if(fd < 0)
{
LOGE("Failed to open brightness node, aborting");
return;
}
length = strlen(brightness);
LOGD("Setting brightness to: %s", brightness);
write(fd, brightness, length);
close(fd);
}
// This is the main loop function, where we check battery state
void lpm_loop(void)
{
int level = -1;
int l = -1;
while(1)
{
level = lpm_battery_level();
// Only refresh the image if the battery level changed
if(level != l)
{
// Setting brightness to a very low level to reduce battery usage while charging
lpm_backlight_brightness("5");
lpm_display_level(level);
}
l = level;
sleep(LPM_LOOP_DELAY);
}
}
// Check if the phone is booting in charging mode
int lpm_check(void)
{
int fd = -1;
char value[2];
fd = open("/sys/class/power_supply/battery/charging_mode_booting", O_RDONLY);
if(fd < 0)
{
LOGE("Failed to open charging_mode_booting node, aborting");
return 0;
}
read(fd, value, sizeof(value));
close(fd);
if(value[0] == '1')
{
LOGD("Phone is booting in charging mode");
return 1;
}
return 0;
}
int main(int argc, char *argv[])
{
// Start loop only if the phone is booting in charging mode
if(lpm_check() == 1)
{
lpm_loop();
}
return 0;
}
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