compiling raw source code of device driver
 

I have a device driver's(ethernet card)source code in "driver.c" i have to compile it and convert it to "driver.o" how to compile please help.After compiling it i can easily insert to the kernel module but i could not compile it.

You will need to provide more information. Such as which NIC card the driver is for, your distribution, the version of the kernel (ver 2.4 vs 2.6). I doubt that you have just a driver.c program. You probably started with a tarball, and need to read the README file for full instructions.

"driver" is too generic of a name, so if the target is driver.o, it will probably be linked into the final driver-name.ko kernel module.

One of the things you will need to do is install the kernel-source.
If your distro is RPM based, there will probably be a package named kernel-source-<version>.rpm, however for Fedora Core, it will be a source rpm that you need to install.
The version of the rpm file should match the version displayed by the "uname -r" command.

You will also need the GCC compiler package if it isn't already.

The exact steps for producing a kernel module differs between 2.4 and 2.6 version kernels. If you are using the kernel-source from your distro, there will also be a Readme file with the distro detailing the steps you need to perform. There may be a makefile which performs the steps needed. This is usually the case for 3rd party drivers that aren't part of the kernel tree. One example is ndiswrapper, which compiles a ndiswrapper.ko kernel module and installs it.

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By the way, the personal pronoun "I" should be capitalized.