need information on accessible documentation

[krishnakant Mane]

hello all, this might be or might not be off topic.
I will like to know if there is any web site from where I can download
accessible (text or html) documentation for the linux kernel api and
the function reference for the c libraries used with linux?
I also need downloaded documentation for the alsa sound architecture.
and please provide any web site where I can download some detailed
tutorials on getting started with linux device drivers and
downloadable versions will be prefered.
further more has some one documented the yasr source code as a reference?
thanks any advance.
Krishnakant.