Listing on board/integrated devices on Linux - for instance, on board keyboard

Relevant to laptops only - I am trying to list all on-board (integrated) devices on laptops - such as on board keyboard, mouse touchpad, video card, etc shipped with the machine. 1. What is the best command for the job ? dmidecode, lspci, lshw ? Can all this data be extracted using a single tool ? For instance, I have not been able to locate any data pertaining to the on-board keyboard neither in dmidecode nor in lshw. lspci shows only a header line. 2. For the sake of understanding, do all such devices fall into the category of PCI devices - where each of them has its specific way to interface with the motherboard (ISA Bridge, IDE interface, different controllers, etc) ? I am testing this on a Lenovo EThink Pad 470