Linux Device Drivers – Communicating with Hardware

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