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Add LED
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15
README.md
15
README.md
@ -3,7 +3,7 @@ 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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Get / Set display backlight brightness.
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```
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$ pptk-backlight get
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@ -11,6 +11,19 @@ $ pptk-backlight get
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$ pptk-backlight set 6
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```
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### led
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Get / Set LED light level for the RGB indicator and the white flash light.
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```
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# Get red RGB indicator brightness
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$ pptk-led get red
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255
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# Turn RED indicator OFF
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$ pptk-led set red 0
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# Turn FLASH light ON
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$ pptk-led set flash 255
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```
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## Build & Install
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```
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$ meson build
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@ -1,3 +1,5 @@
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project('PinePhone Toolkit', 'c')
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executable('pptk-backlight', ['src/backlight.c'],
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install: true, install_mode: ['rwsr-xr-x', 0, 0])
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executable('pptk-led', ['src/led.c'],
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install: true, install_mode: ['rwsr-xr-x', 0, 0])
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96
src/led.c
Normal file
96
src/led.c
Normal file
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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 = "./led";
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static char *led_file_template = "/sys/class/leds/%s:%s/brightness";
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void print_usage()
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{
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printf("usage: %s COMMAND COLOR [VALUE]\n", argv0);
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printf(" COMMAND = {get, set}\n");
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printf(" get ... prints LED level\n");
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printf(" set ... sets LED level to VALUE\n");
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printf(" COLOR = {red, green, blue, flash}\n");
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printf(" red ... red:indicator LED\n");
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printf(" green ... green:indicator LED\n");
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printf(" blue ... blue:indicator LED\n");
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printf(" flash ... white:flash LED\n");
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printf(" VALUE = [0..255] ... light level\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(char *filepath)
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{
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FILE *fp = fopen(filepath, "r");
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if (fp == NULL) {
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fprintf(stderr, "Cannot open file '%s' for reading.\n", filepath);
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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(char *filepath, 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(filepath, "w+");
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if (fp == NULL) {
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fprintf(stderr, "Cannot open file '%s' for writing.\n", filepath);
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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 < 3) {
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print_usage_and_fail();
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}
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char *command = argv[1];
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char *led = argv[2];
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if (strcmp(led, "red") != 0
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&& strcmp(led, "blue") != 0
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&& strcmp(led, "green") != 0
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&& strcmp(led, "flash")) {
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print_usage_and_fail();
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}
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char *type = "indicator";
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if (strcmp(led, "flash") == 0) {
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led = "white";
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type = "flash";
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}
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char filename[255];
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sprintf(filename, led_file_template, led, type);
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if ((strcmp(command, "get") == 0) && (argc == 3)) {
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command_get(filename);
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} else if ((strcmp(command, "set") == 0) && (argc == 4)) {
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int value = atoi(argv[3]);
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if (value < 0 || value > 255) {
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print_usage_and_fail();
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}
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command_set(filename, 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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