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For a very long time, the kernel had only support for basic PS/2 devices such as the PS2 AT keyboard and regular PS2 mouse (with a scroll wheel). To adapt to this, we had very simple abstractions in place, essentially, the PS2 devices were registered as IRQ handlers (IRQ 1 and 12), and when an interrupt was triggered, we simply had to tell the I8042Controller to fetch a byte for us, then send it back to the appropriate device for further processing and queueing of either a key event, or a mouse packet so userspace can do something meaningful about it. When we added the VMWare mouse integration feature it was easily adapted to this paradigm, requiring small changes across the handling code for these devices. This patch is a major cleanup for any future advancements in the HID subsystem. It ensures we do things in a much more sane manner: - We stop using LockRefPtrs. Currently, after the initialization of the i8042 controller, we never have to change RefPtrs in that class, as we simply don't support PS2 hotplugging currently. Also, we remove the unnecessary getters for keyboard and mouse devices which also returned a LockRefPtr. - There's a clear separation between PS2 devices and the actual device nodes that normally exist in /dev. PS2 devices are not polled, because when the user uses these devices, they will trigger an IRQ which when is handled, could produce either a MousePacket or KeyEvent, depending on the device state. The separation is crucial for buses that are polled, for example - USB is a polled bus and will not generate an IRQ for HID devices. - There's a clear separation in roles of each structure. The PS2 devices which are attached to a I8042Controller object are managing the device state, while the generic MouseDevice and KeyboardDevice manage all related tasks of a CharacterDevice, as well as interpreting scan code events and mouse relative/absolute coordinates. |
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| .. | ||
| Controller.h | ||
| Device.h | ||
| KeyboardDevice.cpp | ||
| KeyboardDevice.h | ||
| Management.cpp | ||
| Management.h | ||
| MouseDevice.cpp | ||
| MouseDevice.h | ||
| ScanCodeEvent.h | ||