To create the driver

make	

Remove module if exist

sudo rmmod mastermind

Major number, max guess number and secret number can be given as module parameters

sudo insmod mastermind.ko major_number=142 mmind_max_guesses=10 mmind_number=4283	

To see mastermind in the list of loaded modules

lsmod

Remove device node if exist

sudo rm /dev/mastermind

Create device node

sudo mknod -m 666 /dev/mastermind c 142 0

Write to device (example)

echo "1234" > /dev/mastermind

Read from device

cat /dev/mastermind

Compile test code

gcc -o game game.c

Execute test code

./game

When program is executed the process given below will be performed

Enter secret:                               --->type 4 digit secret number				           
Staring new game secret= < secret number >  --->Your secret number will be showing here
Commands:                                   --->Possible commands that user can select
(New Game) new < secret >                   --->To start new game, type "new" and your secret number 
(Exit Game) end 0                           --->To end game, type "end" and 0
(Guess) gus < guess >                       --->To do guess, type "gus" and your guess number