ledctl

APKBUILD

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+# Contributor:
+# Maintainer:
+pkgname=ledctl
+pkgver=1.1
+pkgrel=0
+pkgdesc="Simple Utilities for controlling the led on a RPI0W"
+url="http://127.0.0.1/ledctl"
+arch="x86_64 armhf"
+license="Unlicense"
+depends=""
+makedepends=""
+checkdepends=""
+install=""
+subpackages=""
+source="
+	ledctl.c
+	ledctl_off
+	ledctl_tipoff
+	"
+builddir="$srcdir/"
+
+build() {
+	gcc -O3 -Wall "ledctl.c" -o "$builddir/ledctl"
+}
+
+check() {
+	return
+}
+
+package() {
+	# Replace with proper package command(s)
+	install -m755 -D "$srcdir"/$pkgname \
+		"$pkgdir"/usr/bin/$pkgname 
+	install -m755 -D "$srcdir"/ledctl_off \
+		"$pkgdir"/etc/init.d/ledctl_off
+	install -m755 -D "$srcdir"/ledctl_tipoff \
+		"$pkgdir"/etc/init.d/ledctl_tipoff
+}
+
+sha512sums="
+6c0780670f77b48e74d167160b7ba3d52f40964bf1eb45f4982d0f9bf63d5402b82e29e25c31936369e344cb8bf74de952f37916478dca87bd50390f3c21f49f  ledctl.c
+aac806e7c18d1594450124f3554ccb3c3cba760fc8512fd6c60a0aee544d016d74fd0f944ed4bc66c06554892937d0f1eb796052c195bbcd7f1f1eda44760755  ledctl_off
+01783cc00c972fed0bb2cf8df5e4040872cfcfa34af887583e6076d46372003aee1026f05d36038af2520dfaffc7af69d0d9a33b502bf88d1e34b721ac6310fc  ledctl_tipoff
+"

LICENCE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>

ledctl.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+
+#define LEDFILE "/sys/class/leds/ACT/brightness"
+
+
+//write to the led
+int wrLED(int fd, int val){
+  char *opts[] = {"0", "1"};
+  return write(fd, opts[val], 1);
+}
+
+void printVersion(){
+  printf("ledctl 1.0\n");
+}
+
+void printUsage(char *errormsg){
+  if (errormsg != NULL) printf("Error: %s\n", errormsg);
+  printVersion();
+  printf("Usage:\n");
+  printf("  ledctl -v       print version information\n");
+  printf("  ledctl -h       print this message\n");
+  printf("  ledctl on|off   turn the LED on or off\n");
+  printf("  ledctl  1|0\n");
+  printf("  ledctl -r REPEAT -s VALUE TIMING [-s VALUE TIMING ...]\n");
+}
+
+int main(int argc, char *argv[]){
+  if (argc < 2) return 1;
+  char path[] = LEDFILE;
+  int fd = open(path, O_RDWR);
+  
+  if (strcmp(argv[1], "on") == 0 || strcmp(argv[1], "1") == 0){
+    wrLED(fd, 1);
+    close(fd);
+    return 0;
+  }
+  if (strcmp(argv[1], "off") == 0 || strcmp(argv[1], "0") == 0){
+    wrLED(fd, 0);
+    close(fd);
+    return 0;
+  }
+  if (strcmp(argv[1], "-v") == 0 && argc == 2){
+    printVersion(NULL);
+    close(fd);
+    return 0;
+  }
+  if (strcmp(argv[1], "-h") == 0 && argc == 2){
+    printUsage(NULL);
+    close(fd);
+    return 0;
+  }
+  if (strcmp(argv[1], "-r") != 0 || argc < 6 || (argc % 3) != 0){
+    printUsage(NULL);
+    close(fd);
+    return 1;
+  }
+  if (argc % 3 !=0) {
+    printUsage("Invalid number of arguments");
+    close(fd);
+    return 1;
+  }
+
+  // keep track of previous state
+  char prev;
+  read(fd, &prev, 1);
+  
+  int pattern_repetitions = atoi(argv[2]);
+
+  char **args_pattern = &argv[3];
+  int pattern_steps = (argc-3) / 3;
+
+  int   pattern_values[pattern_steps];
+  float pattern_timing[pattern_steps];
+  
+  //parse arguments into our schema
+  for (int i=0; i < pattern_steps; i++){
+    int args_pattern_index = i*3;
+    if (strcmp(args_pattern[args_pattern_index], "-s") != 0){
+      printUsage("Invalid format for -s flag");
+      close(fd);
+      return 1;
+    }
+    pattern_values[i] = atoi(args_pattern[args_pattern_index + 1]);
+    pattern_timing[i] = atof(args_pattern[args_pattern_index + 2]);
+
+  }
+  
+  for (int i = 0; i < pattern_repetitions; i++) {
+      for (int pstep = 0; pstep < pattern_steps; pstep++) {
+          wrLED(fd, pattern_values[pstep]);
+          usleep(1000000 * pattern_timing[pstep]);
+      }
+  } 
+  write(fd, &prev, 1);
+  close(fd);
+}

ledctl_off

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+#!/sbin/openrc-run
+
+name="ledoff"
+description="Turn the danm led off"
+
+depend() {
+  need localmount
+  before sysctl
+}
+
+start(){
+  ledctl off
+}

ledctl_tipoff

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+#!/sbin/openrc-run
+name="ledtipoff"
+description="Blink Led when ssh is enabled"
+
+depend() {
+	need sshd
+}
+
+start() {
+  ledctl -r 3 -s 0 0.2 -s 1 0.1 -s 0 0.1 -s 1 0.1
+}