A sample char device driver
###Compile:
#make
virtualchar.ko will be generated.
###Insert module:
#sudo insmod virtualchar.ko
###Verify:
#cat /proc/devices
virtualchar will be shown up with major number.
###Create node:
#sudo mknod /dev/virtualchar c 148 0
#sudo chmod 666 /dev/virtualchar
###Run:
#echo 'Hello world!' > /dev/virtualchar
#cat /dev/virtualchar
Also see dmesg for printk message.
###Auto generate device node
you can use the auto_load to generate the device file in /dev folder
#./auto_load