rohit-b-kadam / device-driver

Implementing Character Device Driver.

Device Driver

Implementing Character Device Driver.

• Device driver are use to communicate with specific hardware devices.

• Every Device Driver is module but every module are not device driver.

• There are three type of Device Driver

  1. Character device Driver ( device which take and give input and output directly).
  2. Block Device Driver.
  3. Network Device Driver.
  4. USB Device Driver.

• Module is use for

  1. To increase the functionality .
  2. To write system call.

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Kernal Command

1. lsmod : list of module in Kernal.
2. modinfo module_name : to see information of module.
3. insmod : use to insert .ko (module) file inside the kernal.
4. rmmod : Use to remove module from kernal.

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Note

All the printk() message is written in a kernal log file ( syslog ). This file is present inn /var/log You can also see this file using command dmesg

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Command To Load Custom Driver

$ make
$ sudo insmod MyFirstDeviceDriver.ko
$ lsmod
$ modinfo MyFirstDeviceDriver.ko
$ sudo rmmod MyFirstDeviceDriver.ko
$ dmesg