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 "$1" value 0
  18
  19         [ -z "$gpio_pin" ] && {
  20                 echo >&2 "Skipping gpio_switch '$name' due to missing gpio_pin"
  21                 return 1
  22         }
  23
  24         local gpio_path
  25         if [ -n "$(echo "$gpio_pin" | grep -E "^[0-9]+$")" ]; then
  26                 gpio_path="/sys/class/gpio/gpio${gpio_pin}"
  27
  28                 # export GPIO pin for access
  29                 [ -d "$gpio_path" ] || {
  30                         echo "$gpio_pin" >/sys/class/gpio/export
  31                         # we need to wait a bit until the GPIO appears
  32                         [ -d "$gpio_path" ] || sleep 1
  33                 }
  34
  35                 # direction attribute only exists if the kernel supports changing the
  36                 # direction of a GPIO
  37                 if [ -e "${gpio_path}/direction" ]; then
  38                         # set the pin to output with high or low pin value
  39                         { [ "$value" = "0" ] && echo "low" || echo "high"; } \
  40                                 >"$gpio_path/direction"
  41                 else
  42                         { [ "$value" = "0" ] && echo "0" || echo "1"; } \
  43                                 >"$gpio_path/value"
  44                 fi
  45         else
  46                 gpio_path="/sys/class/gpio/${gpio_pin}"
  47
  48                 [ -d "$gpio_path" ] && {
  49                         { [ "$value" = "0" ] && echo "0" || echo "1"; } \
  50                                 >"$gpio_path/value"
  51                 }
  52         fi
  53 }
  54
  55 service_triggers()
  56 {
  57         procd_add_reload_trigger "system"
  58 }
  59
  60 start_service()
  61 {
  62         [ -e /sys/class/gpio/ ] && {
  63                 config_load system
  64                 config_foreach load_gpio_switch gpio_switch
  65         }
  66 }