src/functions/functions.leds

   1 #!/bin/bash
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2018 IPFire Network Development Team                          #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 led_exists() {
  23         local led="${1}"
  24         assert isset led
  25
  26         file_exists "/sys/class/leds/${led}"
  27 }
  28
  29 led_get_supported_triggers() {
  30         local led="${1}"
  31
  32         if ! led_exists "${led}"; then
  33                 error "LED ${led} does not exist"
  34                 return ${EXIT_ERROR}
  35         fi
  36
  37         local triggers="$(fread "/sys/class/leds/${led}/trigger")"
  38
  39         # Filter markers for active trigger
  40         print "${triggers//[\[\]]/}"
  41 }
  42
  43 led_set_trigger() {
  44         local led="${1}"
  45         local trigger="${2}"
  46
  47         assert isset led
  48         assert isset trigger
  49
  50         local supported_triggers="$(led_get_supported_triggers "${led}")"
  51         if ! list_match "${trigger}" ${supported_triggers}; then
  52                 log DEBUG "Trigger ${trigger} is not supported by LED ${led}"
  53                 return ${EXIT_ERROR}
  54         fi
  55
  56         log DEBUG "Setting LED trigger ${trigger} for ${led}"
  57         fwrite "/sys/class/leds/${led}/trigger" "${trigger}"
  58 }