On Fri, 29 Sep 2017 19:38:49 -0300, "Bruno E. O. Meneguele" said:
2) I'm using a USB keyboard as the testing device, and TBH I got confused if I could actually use the input subsystem for that or I _should_ use HID instead (considering the keyboard is HID compliant).
Step 0: Decide if you're writing an interrupt handling driver, a USB driver, or an HID driver - the three live at different levels of abstraction, and confusing them will also confuse both you and your kernel. Step 1: Whichever level you decide on, your kernel probably already has a driver that will gladly grab onto a USB keyboard at that level. Find out how to tell your kernel to not grab the device, as sharing a device between two drivers never works out well, no matter what abstraction you're using. Step 2: Take a backup of your system, just in case (which you should be doing *anyhow* - neither spinning oxide disks nor flash-based drives are perfect). Step 3: Write the driver....