Writing device drivers in Linux: A brief tutorial - The Diigo Meta page

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  • insmod and rmmod use the kernel space functions module_init and module_exit.
  • knod /dev/memory c 60 0
  • register_chrdev
  • /* Registering device */
  • /* Allocating memory for the buffer */
  • kmalloc
  • * Freeing the major number */
  • unregister_chrdev
  • /* Freeing buffer memory */
  • kfree
  • memory_open
  • memory_release
  • memory_read
  • he memory_read function transfers a single byte from the driver buffer (memory_buffer) to user space with the function copy_to_user:
  • * Transfering data to user space */
  • copy_to_user
  • memory_write
  • The complete “memory” driver
  • insmod memory.ko
  • chmod 666 /dev/memory
  • checking the availability of a memory region (check_region),
  • reserve the memory region for this device (request_region)

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  • Finally, the global variables of the driver are declared: one of them is the major number of the driver, the other is a pointer to a region in memory, memory_buffer, which will be used as storage for the driver data.
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  • the kernel,
  • and in particular its device drivers, form a bridge or interface between the end-user/programmer and
  • the hardware.
  • Any subroutines or functions forming part of the kernel (modules and device drivers, for
  • example) are considered to be part of kernel space.

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  • Writing device drivers in Linux: A brief tutorial
  • his brief tutorial will only cover type char devices loaded as modules
  • ere are several different devices in Lin
  • Kernel space
  • Linux (which is a kernel) manages the machine’s hardware in a simple and efficient manner, offering the user a simple and uniform programming interface
  • End-user programs, like the UNIX shell or other GUI based applications
  • User space
  • these applications need to interact with the system’s hardware
  • hrough the kernel supported function
  • Unix devices are seen, from the point of view of the user, as files.

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  • A quick and easy intro to writing device drivers for Linux like a true kernel developer!
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  There are several different devices in Linux. For simplicity, this brief tutorial will only cover type char devices loaded as modules. Kernel 2.6.x will be used (in particular, kernel 2.6.8 under Debian Sarge, which is now Debian Stable).

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  Writing device drivers in Linux: A brief tutorial
  A quick and easy intro to writing device drivers for Linux like a true kernel developer!

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Page Comments

• 
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  A quick and easy intro to writing device drivers for Linux like a true kernel developer!
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