I have have to write a video device driver,
but rendering will happening in memory, not on a
physical card. I already wrote a simple
driver stripping out hardware piece code from
an existent vodoo driver. I an install it, uninstall
it but i dont know how to map it to a file
/dev/mydevice_video

Is there a field in fb_info or fb_vscreenifo where the device name has to be passed before calling register_framebuffer.

Thank you,

If you registered everything properly with the Framebuffer subsystem, my understanding is that you should end up with /dev/fbX where X is the next number in line for your framebuffer device.

Just my, admittedly limited, understanding.

Thank you.
Yes, register_frambuffer gets next free index in free fb#.
It calls create_device(..."fb", i); so always creates "fb#"
I have a problem testing it on ubuntu 9 with fb0, because there is no fb's on ubuntu, and as soon I register it as /dev/fb0 some process take over it and I cannot rmmod it. I would prefer to have it /dev/my_fb for the time being.

I still have questions

Do I have to provide functions for both
'fb_ops'
and
'file_operations'

Do I have to call register_chrdev along with register_framebuffer,
because mmap on my test program on /dev/fb0 still returns errno as
no such device (i can see my dev in lsmod and the file /dev/fb0)?

Thank you.