sudo insmod test_power.ko

ls -l /sys/class/power_supply/BAT0
cat /sys/class/power_supply/BAT0/uevent
cat /sys/class/power_supply/BAT0/capacity
cat /sys/class/power_supply/BAT0/status

ls -l /sys/class/power_supply/AC0
cat /sys/class/power_supply/AC0/uevent