target/linux/ath79/base-files/lib/functions/k2t.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (C) 2018 Weijie Gao <hackpascal@gmail.com>
   4 #
   5 # Helper function to extract mac addresses from mtd part for Phicomm K2T
   6 #
   7
   8 . /lib/functions.sh
   9 . /lib/functions/system.sh
  10 . /usr/share/libubox/jshn.sh
  11
  12 k2t_config_load() {
  13         local mtd_blk=$(find_mtd_part config)
  14
  15         if [ -z "$mtd_blk" ]; then
  16                 echo "k2t_config_load: no mtd part named config" >&2
  17                 exit 1
  18         fi
  19
  20         local json_size=$(dd if=$mtd_blk bs=1 count=8 2>/dev/null)
  21
  22         json_size="0x$json_size"
  23         json_size=$((json_size))
  24
  25         if [ "$?" -ne 0 ]; then
  26                 echo "k2t_config_load: invalid json data size" >&2
  27                 exit 2
  28         fi
  29
  30         if [ "$json_size" -eq 0 ]; then
  31                 echo "k2t_config_load: empty json data" >&2
  32                 exit 3
  33         fi
  34
  35         local json_data=$(dd if=$mtd_blk bs=1 skip=8 count=$json_size 2>/dev/null)
  36
  37         json_load "$json_data"
  38 }
  39
  40 k2t_get_mac() {
  41         local old_ns
  42
  43         json_set_namespace "k2t" old_ns
  44
  45         if k2t_config_load; then
  46                 json_select "this_dev_info"
  47                 json_get_var val "$1"
  48                 json_select ..
  49         fi
  50
  51         json_set_namespace old_ns
  52
  53         echo $val
  54 }
  55