On 29-09, valdis.kletnieks@xxxxxx wrote: > 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. > I don't know why I didn't realize earlier the two counterparts: interruption vs USB, USB devices are handled in polling mode, not with IRQs. So, I could try something else to dive in IRQ's world, like 'timers' or stick with USB world for now, let's say I choose: USB driver in this step. > 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. > Right. > 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). > SSD here, I hope I don't destroy it :). But thanks for the advice. > Step 3: Write the driver.... Sounds like a plan. If I had realized earlier about what I said in 'step 0' I could've figured out why what I was trying to do wasn't working. Actually another point I didn't pay attention was to the fact that i8042 is a PS/2 controller and not an USB one.. I'm using a USB keyboard attached to a laptop which has the trackpad and keyboard as PS/2 devices, of course things won't work. Well, I'm sorry for that! But at same time thank you very much :)! I think I'll be back soon, but hopefuly with better questions. Thanks. -- bmeneg PGP Key: http://bmeneg.com/pubkey.txt
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