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/* Copyright (c) 2018, June McEnroe <programble@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sysexits.h>
#include <unistd.h>
static const char *CLASS = "/sys/class/power_supply";
static const uint32_t RIGHT = 5 * 8 + 1; // fbclock width.
static const uint32_t WIDTH = 8;
static const uint32_t HEIGHT = 16;
static const uint32_t BG = 0x161510;
static const uint32_t BORDER = 0x7A7155;
static const uint32_t GRAY = 0x4C4635;
static const uint32_t YELLOW = 0xA37720;
static const uint32_t RED = 0xA32810;
int main() {
int error;
DIR *dir = opendir(CLASS);
if (!dir) err(EX_OSFILE, "%s", CLASS);
FILE *chargeFull = NULL;
FILE *chargeNow = NULL;
const struct dirent *entry;
while (NULL != (errno = 0, entry = readdir(dir))) {
if (entry->d_name[0] == '.') continue;
error = chdir(CLASS);
if (error) err(EX_OSFILE, "%s", CLASS);
error = chdir(entry->d_name);
if (error) err(EX_OSFILE, "%s/%s", CLASS, entry->d_name);
chargeFull = fopen("charge_full", "r");
chargeNow = fopen("charge_now", "r");
if (chargeFull && chargeNow) break;
}
if (!chargeFull || !chargeNow) {
if (errno) err(EX_OSFILE, "%s", CLASS);
errx(EX_CONFIG, "%s: empty", CLASS);
}
closedir(dir);
const char *path = getenv("FRAMEBUFFER");
if (!path) path = "/dev/fb0";
int fb = open(path, O_RDWR);
if (fb < 0) err(EX_OSFILE, "%s", path);
struct fb_var_screeninfo info;
error = ioctl(fb, FBIOGET_VSCREENINFO, &info);
if (error) err(EX_IOERR, "%s", path);
size_t size = 4 * info.xres * info.yres;
uint32_t *buf = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fb, 0);
if (buf == MAP_FAILED) err(EX_IOERR, "%s", path);
for (;;) {
int match;
rewind(chargeFull);
fflush(chargeFull);
uint32_t full;
match = fscanf(chargeFull, "%u", &full);
if (match == EOF) err(EX_IOERR, "charge_full");
if (match < 1) errx(EX_DATAERR, "charge_full");
rewind(chargeNow);
fflush(chargeNow);
uint32_t now;
match = fscanf(chargeNow, "%u", &now);
if (match == EOF) err(EX_IOERR, "charge_now");
if (match < 1) errx(EX_DATAERR, "charge_now");
uint32_t percent = 100 * now / full;
uint32_t height = 16 * now / full;
for (int i = 0; i < 60; ++i, sleep(1)) {
uint32_t left = info.xres - RIGHT - WIDTH;
for (uint32_t y = 0; y <= HEIGHT; ++y) {
buf[y * info.xres + left - 1] = BORDER;
buf[y * info.xres + left + WIDTH] = BORDER;
}
for (uint32_t x = left; x < left + WIDTH; ++x) {
buf[HEIGHT * info.xres + x] = BORDER;
}
for (uint32_t y = 0; y < HEIGHT; ++y) {
for (uint32_t x = left; x < left + WIDTH; ++x) {
buf[y * info.xres + x] =
(HEIGHT - 1 - y > height) ? BG
: (percent <= 10) ? RED
: (percent <= 30) ? YELLOW
: GRAY;
}
}
}
}
}
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