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;
+				}
+			}
+		}
+	}
+}