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https://github.com/Dejvino/pinephone-toolkit.git
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Add backlight
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README.md
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README.md
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# PinePhone Toolkit
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A collection of tools and utility apps for the PINE64 PinePhone.
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## Components
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### backlight
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Get / Set backlight brightness.
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## Building
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```
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$ meson build
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$ cd build
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$ ninja
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```
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meson.build
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meson.build
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project('PinePhone Toolkit', 'c')
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executable('pptk-backlight', ['src/backlight.c'])
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src/backlight.c
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src/backlight.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static char *argv0 = "./backlight";
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static char *backlight_file = "/sys/devices/platform/backlight/backlight/backlight/brightness";
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void print_usage()
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{
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printf("usage: %s COMMAND [VALUE]\n", argv0);
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printf(" COMMAND = {get, set}\n");
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printf(" get ... prints current backlight level\n");
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printf(" set ... sets backlight level to VALUE\n");
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printf(" VALUE = [0..10] ... backlight amount\n");
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}
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void print_usage_and_fail()
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{
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print_usage();
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exit(EXIT_FAILURE);
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}
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void command_get()
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{
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FILE *fp = fopen(backlight_file, "r");
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if (fp == NULL) {
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fprintf(stderr, "Cannot open file '%s' for reading.\n", backlight_file);
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exit(EXIT_FAILURE);
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}
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int buffer_length = 255;
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char buffer[buffer_length];
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while (fgets(buffer, buffer_length, fp)) {
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printf("%s", buffer);
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}
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fclose(fp);
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}
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void command_set(int value)
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{
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if (setuid(0)) {
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fprintf(stderr, "Cannot set root permissions via setuid(0).\n");
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exit(EXIT_FAILURE);
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}
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FILE *fp = fopen(backlight_file, "w+");
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if (fp == NULL) {
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fprintf(stderr, "Cannot open file '%s' for writing.\n", backlight_file);
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exit(EXIT_FAILURE);
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}
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fprintf(fp, "%d\n", value);
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fclose(fp);
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}
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int main(int argc, char *argv[])
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{
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if (argc < 1) {
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print_usage_and_fail();
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}
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argv0 = argv[0];
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if (argc < 2) {
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print_usage_and_fail();
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}
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char *command = argv[1];
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if ((strcmp(command, "get") == 0) && (argc == 2)) {
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command_get();
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} else if ((strcmp(command, "set") == 0) && (argc == 3)) {
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int value = atoi(argv[2]);
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if (value < 0 || value > 10) {
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print_usage_and_fail();
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}
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command_set(value);
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} else {
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print_usage_and_fail();
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}
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exit(EXIT_SUCCESS);
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}
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