Re: basic FB development questions

Es geschah am Wednesday, 23. April 2008 11:01 als Geert Uytterhoeven schrieb:

On Wed, 23 Apr 2008, Christian Schoenebeck wrote:

quoted

First of all, AFAIK most FB drivers are based upon memory mapped IO,
right? But in my case the graphics are forwarded via calls of Linux's USB
subsystem. Which FB approach would suggest in this case? Something like
the virtual framebuffer driver with some kind of static allocated buffer?
If yes, what kind of function would I have to implement to trigger the
screen sync between that modified buffer and the hardware (that is
sending the buffer's data via USB to the device)? Or should I implement
mmap? I mean: I know everything about the USB side to recognize the
device and sending data etc., I just don't know how to establish a FB
callback or something to "flush" the suggested graphics buffer.

Documentation/fb/deferred_io.txt

Ah, that's a good one!

Seems the "hecubafb" driver is a very good candidate for stealing code for 
that USB LCD FB driver.

Thanks a lot Geert!

CU
Christian

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