Device Driver

• Forum
  • Linux設備驅動開發專業論壇:linuxdriver.cn
  • Greg K-H's Linux Stuff

• Linux Driver Model
  • <linux src>/include/linux/device.h
  • <linux src>/drivers/base/driver.c

dev_t

• MINOR/MAJOR
  • All major and minor numbers are assigned a name that matches up with a type of device.
• MKDEV
• register_chrdev_region
• alloc_chrdev_region
• unregister_chrdev_region

register

• register_chrdev
• unregister_chrdev

debug

• printk

memory allocate

• kmalloc
• kfree
• kfree_s

memory copy

• copy_to_user,copy_from_user,get_user,put_user函数比较
• access_ok
• __get_user, __put_user
• memcpy _fromfs
• memcpy_tofs
• put_fs_byte
• get_fs_byte

memory region

• check_region
• request_region
• release_region

I/O

• inb
• outb

interrupt

• function
  • cli
  • sti
  • request_irq, irqaction
  • free_irq
• /proc/interrupts
• Shared Interrupt
  • SA_SHIRQ bit must be specified in the flags argument
  • dev_id argument must be unique
  • return IRQ_NONE whenever your handler is called and finds that the device is not interrupting

privilege

• suser

system flag

• save_flags
• restore_flags

asynchronous notification

• fcntl, F_SETOWN
• fcntl, F_SETFL, FASYNC
• SIGIO signal

• file operations

file

• /usr/src/linux/include/fs.h

select/poll

• User Applications
  • select(BSD), poll(System V)
    • Using the select() and poll() methods
    • I/O Multiplexing - The role of the 'poll' method in Linux device driver operations
  • FD_ZERO
  • FD_CLR
  • FD_SET
  • FD_ISSET

• Device Drivers
  • poll_table
  • poll_wait
    • adds a wait queue to the poll_table structure
  • mask
    • POLLIN(There is data to read)
    • POLLRDNORM(Equivalent to POLLIN)
    • POLLOUT(Writing now will not block)
    • POLLWRNORM(Equivalent to POLLOUT)

ioctl

fcntl

It is kept separate from ioctl mainly for historical reasons: when Unix developers faced the problem of controlling I/O operations, they decided that files and devices were different. At the time, the only devices with ioctl implementations were ttys, which explains why -ENOTTY is the standard reply for an incorrect ioctl command.

flags

• O_NONBLOCK(O_NDELAY)

• Device Drivers
  • LINUX ALLOCATED DEVICES
  • Jollen 的 Linux Device Driver 專欄
  • 如 何 開 發 Linux Device Driver?
  • Writing a Linux device driver

2.6

• Oreilly Linux Device Drivers by Kroah-Hartman, Third Edition PDF, Web
• Linux设备驱动开发详解
• Embedded Linux kernel and driver development
• Linux Device Driver Template/Skeleton with Interrupt Handler and Device Read Blocking (Kernel Module Example)

2.4

• Linux Device Drivers, 2nd Edition

Solaris

• Writing Device Drivers

Character

• The Devil's in the Details
• Dissecting Interrupts and Browsing DMA
• Device Drivers Concluded
• Writing Character Device Driver for Linux

Block

• Userspace Device Driver
  • User-space device drivers