IO Architecture

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I/O Architecture
and
Device Drivers
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CPU
I/O Bus
I/O Ports
I/O Device
I/O Interface
I/O Controller
PCs I/O Architecture
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Device Driver Model

• Linux provides some data structures and helper
  functions that offer a unifying view of all
  buses, devices and device drivers in the system.
  This framework is called the device driver model.

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• A device driver should be able to take care of
• Power management .
• Plug and play.
• Hot-plugging.

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Components of the Device Driver Model

• Devices
• Device drivers
• Buses

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Fields of the device objects
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Device Drivers

• A device driver is the set of kernel routines
  that makes a hardware device respond to the
  programming interface defined by the canonical
  set of VFS functions, that control a device.

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Before using a Device Driver.

• Device Driver Registration.
• Device Driver Initialization.
• Monitoring I/O operations.

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Types of Device Drivers

• Character Device Drivers
• Block Device Drivers.

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What I plan to do

• Write my own driver.
• ( Hopefully ! )

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References

• Linux Device Drivers by Corbet, Rubin,
  Kroah-Hartman.
• Understanding the Linux Kernel by Bovet and
  Cesati.