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Linux Kernel Development

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Priyank Kapadia
Priyank Kapadia

The document provides an overview of device driver development in Linux, including character device drivers. It discusses topics such as device driver types, kernel subsystems, compiling and loading kernel modules, the __init and __exit macros, character device registration, and issues around reference counting when removing modules. It also provides sample code for a basic character device driver that prints information to the kernel log.

Technology
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Hemen Kapadia 27 th January, 2007 Linux Kernel Development – Character Device Drivers Basics
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[object Object],App1 App2 C Library Actual respective hardware System Call Interface Process Mgmt Memory Mgmt Filesys Mgmt Device Ctrl Networking Filesys Types CPU support code CPU/MMU support code Storage Drivers Character Device Drvr Network Device Drvr
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[object Object],Read buffer Write string read write /dev/foo major/minor User Space Device Driver read handler write handler copy to user copy from user User space needs a device file in /dev to interact with the device through regular file operations (open, read, write etc..) The information of which particular device driver is in charge of device files with a particular major/minor number pair is required by the kernel. Also the kernel would need to have information on which handler functions are to be executed for user space file operations (open, read, write, close) for a given driver
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[object Object],[object Object],[object Object],struct file_operations fops = { .read = device_read, .write = device_write, .open = device_open, .release = device_release };
[object Object],[object Object],[object Object],[object Object],[object Object],ssize_t (*read) ( struct file *, /* Open file descriptor */ char *, /* Userspace buffer to fill up */ size_t, /* Size of the userspace buffer */ loff_t *); /* Offset in the open file */ Called when userspace reads from the device file.
[object Object],[object Object],[object Object],[object Object],int register_chrdev( unsigned int major, //req. major number, 0 if dynamic const char *name, //name as in /proc/devices struct file_operations *fops); // operation handlers
[object Object],[object Object],[object Object],int unregister_chrdev( unsigned int major, // device major number const char *name); //name as in /proc/devices
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Thank You ! Mail: [email_address] Home: http://hemenkapadia.somee.com

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Linux Kernel Development

  • 1. Hemen Kapadia 27 th January, 2007 Linux Kernel Development – Character Device Drivers Basics
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  • 36. Thank You ! Mail: [email_address] Home: http://hemenkapadia.somee.com