Character Device Drivers in deep

Updated on Oct 10: Added Downloads section

What will you learn from this course?

• Introduction to character drivers

• What is device number and device file

• Allocating device number - statically and dynamically

• Creating device file - Manually(mknod) and automatically (udev)

• Registering character device and its file operation with Kernel

• Copying data from user space to kernel space and vice versa

• Understanding the various structures - struct file and struct inode

• Implementation of open, release, read, write, llseek, ioctl file operations

• How to create multiple device nodes and add support for private data

• Flow of write system call from kernel system call entry point to driver write file operations

• Handling all the error cases in ioctl implementation

• Sending a signal to user space from kernel space

• Various access control mechanisms and capabilities

• Misc Driver

API's covered in this course:

• MAJOR

• MINOR

• MKDEV

• register_chrdev_region

• alloc_chrdev_region

• class_create

• device_create

• class_destroy

• device_destroy

• unregister_chrdev_region

• imajor

• iminor

• copy_from_user

• copy_to_user

• put_user

• get_user

• print_dev_t

• format_dev_t

• strnlen_user

• container_of

• access_ok

Commands used in this course:

• mknod

• udevadm monitor