Linux Device Drivers - Communicating with Hardware

Linux Kernel Programming for IO Mapped and Memory Mapped devices

Jul 1, 2025 - 23:16 Updated: Jul 7, 2025 - 00:14

0 0

Linux Kernel Programming for IO Mapped and Memory Mapped devices

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