diff options
Diffstat (limited to '')
| -rw-r--r-- | bin/fbatt.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/bin/fbatt.c b/bin/fbatt.c new file mode 100644 index 00000000..9feffe47 --- /dev/null +++ b/bin/fbatt.c @@ -0,0 +1,123 @@ +/* Copyright (C) 2018 C. McEnroe <june@causal.agency> + * + * 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> + +#include "scheme.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; + +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] = DarkWhite; + buf[y * info.xres + left + Width] = DarkWhite; + } + for (uint32_t x = left; x < left + Width; ++x) { + buf[Height * info.xres + x] = DarkWhite; + } + + 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) ? DarkBlack + : (percent <= 10) ? DarkRed + : (percent <= 30) ? DarkYellow + : LightBlack; + } + } + } + } +} |