Misc Driver

We want to control the power off driver from user space.

Exercises

1. Implement an IOCTL Read command that sends a number to the driver and the driver prints it to the console.
2. Implement and IOCTL command that starts a task to power off QEMU. The time in seconds is supplied by the userspace.
3. Implement an IOCTL to stop the power off.

Bonus

Implement an IOCTL command that return to userspace the amount of time remained until power off.