This paper provides a comprehensive technical overview of the ALPS driver subsystem within the Linux kernel. ALPS Electric Corporation is a primary manufacturer of input peripherals, supplying touchpads and tracksticks for a vast array of laptop manufacturers. Unlike generic Human Interface Devices (HID), ALPS devices often utilize proprietary data reporting protocols that require dedicated kernel drivers. This document explores the hardware communication architecture, the evolution of ALPS protocol versions (from V1 to V8+), the implementation of the alps.c kernel module, and the challenges regarding gesture recognition and multi-touch emulation.
If your touchpad stops working, the first step is often to check if it was accidentally disabled via a keyboard shortcut (usually Fn + a function key with a touchpad icon). If that isn't the cause, follow these steps: Open "Device Manager" by right-clicking the Start button. Expand "Mice and other pointing devices." alps driver
