Add brightness.c and charge-thresholds.c - system76-tools - collection of utilities for system76 laptops
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---
DIR commit 13b5b35c45ecc3ee8acf46ef95c20a54e4bd1c66
HTML Author: parazyd <parazyd@dyne.org>
Date: Wed, 19 Oct 2022 14:07:40 +0200
Add brightness.c and charge-thresholds.c
Diffstat:
A Makefile | 35 +++++++++++++++++++++++++++++++
A brightness.c | 86 ++++++++++++++++++++++++++++++
A charge-thresholds.c | 82 +++++++++++++++++++++++++++++++
3 files changed, 203 insertions(+), 0 deletions(-)
---
DIR diff --git a/Makefile b/Makefile
@@ -0,0 +1,35 @@
+.POSIX:
+
+PREFIX = /usr/local
+CFLAGS = -std=c99 -pedantic -Wall -Wextra -Werror -Os -static
+LDFLAGS = -s -static
+
+SBIN = charge-thresholds brightness
+
+CC = cc
+
+all: $(SBIN)
+
+$(SBIN):
+ $(CC) -c $(CFLAGS) $@.c
+ $(CC) -o $@ $@.o $(LDFLAGS)
+
+clean:
+ for i in $(SBIN); do \
+ rm -f $$i.o $$i ; \
+ done
+
+install: all
+ mkdir -p $(DESTDIR)$(PREFIX)/bin
+ for i in $(SBIN); do \
+ cp -f $$i $(DESTDIR)$(PREFIX)/bin ; \
+ chmod 4711 $(DESTDIR)$(PREFIX)/bin/$$i ; \
+ chmod u+s $(DESTDIR)$(PREFIX)/bin/$$i ; \
+ done
+
+uninstall:
+ for i in $(SBIN); do \
+ rm -f $(DESTDIR)$(PREFIX)/bin/$$i ; \
+ done
+
+.PHONY: all clean install uninstall
DIR diff --git a/brightness.c b/brightness.c
@@ -0,0 +1,86 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+const char *BRIGHTNESS_MAX = "/sys/class/backlight/intel_backlight/max_brightness";
+const char *BRIGHTNESS_CUR = "/sys/class/backlight/intel_backlight/brightness";
+
+void usage(void)
+{
+ fprintf(stderr, "usage: brightness up|dn\n");
+ exit(1);
+}
+
+void die(const char *m)
+{
+ perror(m);
+ exit(1);
+}
+
+enum Op {
+ UP,
+ DN,
+};
+
+int main(int argc, char *argv[])
+{
+ enum Op op;
+ int new, max, cur, inc;
+ size_t len;
+ char *line;
+ FILE *fd;
+
+ if (argc != 2)
+ usage();
+
+ if (!strcmp(argv[1], "up"))
+ op = UP;
+ else if (!strcmp(argv[1], "dn"))
+ op = DN;
+ else
+ usage();
+
+ /* Find out max brightness */
+ if ((fd = fopen(BRIGHTNESS_MAX, "r")) == NULL)
+ die("fopen");
+
+ size_t nread = getline(&line, &len, fd);
+ (void)nread;
+ fclose(fd);
+ fd = NULL;
+
+ max = atoi(line);
+ free(line);
+ line = NULL;
+
+ inc = max / 20;
+
+ if ((fd = fopen(BRIGHTNESS_CUR, "w+")) == NULL)
+ die("fopen");
+
+ nread = getline(&line, &len, fd);
+ (void)nread;
+ cur = atoi(line);
+ free(line);
+ line = NULL;
+
+ switch(op) {
+ case UP:
+ if (cur + inc > max)
+ new = max;
+ else
+ new = cur + inc;
+ break;
+ case DN:
+ if (cur - inc < 1)
+ new = 1;
+ else
+ new = cur - inc;
+ }
+
+ fprintf(fd, "%d", new);
+ fclose(fd);
+
+ return 0;
+}
DIR diff --git a/charge-thresholds.c b/charge-thresholds.c
@@ -0,0 +1,82 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+static const char *START_FD = "/sys/class/power_supply/BAT0/charge_control_start_threshold";
+static const char *END_FD = "/sys/class/power_supply/BAT0/charge_control_end_threshold";
+
+void usage(void)
+{
+ printf("usage: charge-thresholds full-charge|balanced|max-lifespan\n\n");
+ printf("Profiles:\n");
+
+ printf("full-charge: Battery is charged to its full capacity for\n"
+ "the longest possible use on battery power.\n"
+ "Charging resumes when the battery falls below 96%%.\n\n");
+
+ printf("balanced: Use this threshold when you unplug frequently but\n"
+ "don't need the full battery capacity. Charging stops when the\n"
+ "battery reaches 90%% capacity and resumes when the battery\n"
+ "falls below 85%%.\n\n");
+
+ printf("max-lifespan: Use this threshold if you rarely use the system\n"
+ "on battery for extended periods. Charging stops when the battery\n"
+ "reaches 60%% capacity and resumes when the battery falls below 50%%\n");
+
+ exit(1);
+}
+
+void die(const char *m)
+{
+ perror(m);
+ exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+ int start, end;
+ FILE *fd;
+
+ if (argc != 2)
+ usage();
+
+ if (!strcmp(argv[1], "full-charge")) {
+ start = 96;
+ end = 100;
+ } else if (!strcmp(argv[1], "balanced")) {
+ start = 86;
+ end = 90;
+ } else if (!strcmp(argv[1], "max-lifespan")) {
+ start = 50;
+ end = 60;
+ } else {
+ usage();
+ }
+
+ /* Without this, setting start threshold may fail if the previous end
+ * threshold is higher
+ */
+ if ((fd = fopen(END_FD, "w")) == NULL)
+ die("fopen");
+
+ fprintf(fd, "100");
+ fclose(fd);
+ fd = NULL;
+
+ if ((fd = fopen(START_FD, "w")) == NULL)
+ die("fopen");
+
+ fprintf(fd, "%d", start);
+ fclose(fd);
+ fd = NULL;
+
+ if ((fd = fopen(END_FD, "w")) == NULL)
+ die("fopen");
+
+ fprintf(fd, "%d", end);
+ fclose(fd);
+ fd = NULL;
+
+ printf("Thresholds set to: %d-%d\n", start, end);
+ return 0;
+}