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

   1 #!/bin/sh /etc/rc.common
   2 # Copyright (C) 2015 OpenWrt.org
   3
   4 START=94
   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 "$gpio_path" ] || sleep 1
  25         }
  26
  27         # direction attribute only exists if the kernel supports changing the
  28         # direction of a GPIO
  29         if [ -e "${gpio_path}/direction" ]; then
  30                 # set the pin to output with high or low pin value
  31                 { [ "$value" = "0" ] && echo "low" || echo "high"; } >"$gpio_path/direction"
  32         else
  33                 { [ "$value" = "0" ] && echo "0" || echo "1"; } >"$gpio_path/value"
  34         fi
  35 }
  36
  37 service_triggers()
  38 {
  39         procd_add_reload_trigger "system"
  40 }
  41
  42 start_service()
  43 {
  44         [ -e /sys/class/gpio/ ] && {
  45                 config_load system
  46                 config_foreach load_gpio_switch gpio_switch
  47         }
  48 }