Trackpads are anything but standardized. For example those Apple's been using for quite a while now are built with the same touch controllers they use in iPhones (essentially making them iPhone screens sans screen panel), and on the extreme opposite end you've got cheap ones like is built into a Logitech media center combo board I bought several years ago which emulates a mouse instead of presenting itself to the connected device as a trackpad (and as you might expect, is terrible to use).
Trackpads are anything but standardized. For example those Apple's been using for quite a while now are built with the same touch controllers they use in iPhones (essentially making them iPhone screens sans screen panel), and on the extreme opposite end you've got cheap ones like is built into a Logitech media center combo board I bought several years ago which emulates a mouse instead of presenting itself to the connected device as a trackpad (and as you might expect, is terrible to use).