Linux Device Drivers – Communicating with Hardware

Linux Kernel Programming for IO Mapped and Memory Mapped devices

IO Mapped IO

Memory Mapped IO

PCI

Kernel Modules for Keyboard and RTC

Should be able to write/compile/load/unload Hello World Linux Kernel Modules

What you will learn in this course:

Two modes of communication with hardware – IO Mapped IO and Memory Mapped IO

Kernel Drivers/Modules for IO Mapped IO – Speaker, RTC, Keyboard

Kernel Drivers/Modules for Memory Mapped IO – Hardware Random Generator, GPIO, UART

Accessing IO Mapped IO and Memory Mapped IO from user space

PCI and SMBIOS

API’s/Macros/Structures

inb, outb, inw, outw, inl, outl

inb_p, outb_p, inw_p, outw_p, inl_p, outl_p

struct resource, request_region, release_region

ioperm, iopl, geteuid

request_mem_region, release_mem_region, ioremap, iounmap, ioread8, ioread16, ioread32, iowrite8, iowrite16, iowrite32

ioport_map, ioport_unmap,mmap

Files:

/dev/port, /dev/mem, /proc/iomem, /proc/ioports

Commands

hwclock

date

showkey

hexdump

strings

dd

lspci

biosdecode

dmidecode

Kernel developers curious about learning how to communicate with hardware