Writing applications which use native linux device drivers

[Subodh G. Karode]

I want to write an application which uses the native Linux device drivers to write to a serial port. At present, I have a program which uses my own device driver code and writes to a serial port. But that application program fails when I try to write to serial port using ttys1 as device driver. What changes do I need to make in my program so that I can use the native linux device driver. Is there any website which has some application programs or information
which will be of help?