In which file the driver routines for ws2811 is present

Archive FastLED Archive
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In which file the driver routines for ws2811 is present

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Look at “chipsets.h”. You’ll see that WS2811Controller is a subclass of ClocklessController. ClocklessController is architecture-specifc, so depends on the architecture you’re interested in. Look in the platforms directory for header files with the name “clockless”.

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Thanks for your reply
Iam new to arduino
Using Arduino uno with ATmega328 & WS2811 I want to drive 2000 led.
Since memory is low, I have planned to drive 400 leds and calling this 400 led array for 5 times inside the driver part
Suggest me where to update

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That’s going to be difficult to do because the avr clockless output is heavily macro’d hand timed asm code - look in the files in platforms/avr - but I don’t know that what you want to do will be easy to do (and keep the timing tolerances).