package/base-files/files/etc/init.d/gpio_switch

   1 #!/bin/sh /etc/rc.common
   2 # Copyright (C) 2015 OpenWrt.org
   3
   4 START=98
   5 STOP=10
   6 USE_PROCD=1
   7
   8
   9 load_gpio_switch()
  10 {
  11         local name
  12         local gpio_pin
  13         local value
  14
  15         config_get gpio_pin "$1" gpio_pin
  16         config_get name "$1" name
  17         config_get value "$1" value 0
  18
  19         local gpio_path="/sys/class/gpio/gpio${gpio_pin}"
  20         # export GPIO pin for access
  21         [ -d "$gpio_path" ] || {
  22                 echo "$gpio_pin" >/sys/class/gpio/export
  23                 # we need to wait a bit until the GPIO appears
  24                 [ -d "$gpio_path" ] || sleep 1
  25                 echo out >"$gpio_path/direction"
  26         }
  27         # write 0 or 1 to the "value" field
  28         { [ "$value" = "0" ] && echo "0" || echo "1"; } >"$gpio_path/value"
  29 }
  30
  31 service_triggers()
  32 {
  33         procd_add_reload_trigger "system"
  34 }
  35
  36 start_service()
  37 {
  38         [ -e /sys/class/gpio/ ] && {
  39                 config_load system
  40                 config_foreach load_gpio_switch gpio_switch
  41         }
  42 }