v1:
ں drivers/char
޸ drivers/char/Makefileӣ
obj-y += leds_4412.o

±ں

v2:
 leds_4412.c ŵdrivers/leds
޸ drivers/leds/Makefile:
obj-y += leds_4412.o

ں
make menuconfig

CONFIG_LEDS_CLASS
CONFIG_LEDS_TRIGGERS
CONFIG_LEDS_TRIGGER_TIMER

-> Device Drivers
  -> LED Support
   [*]   LED Class Support    
   [*]   LED Trigger support
   <*>   LED Timer Trigger
   
±ں

