Re: porting fb driver to 2, 6(fb_get_fix, fb_get_var)

["Antonino A. Daplas" <adaplas@gmail.com>]

syed khader wrote:
> Hi,
>   I am trying to port one of our LCD display frame
> buffer driver to 2.6 kernel.
>   The old 2.4 kernel had these functions defined in
> fb_ops
>     fb_open:    
>     fb_release:

These 2 are still in 2.6, but they're optional.

>     fb_get_fix: 
>     fb_get_var:     

Gone.

>     fb_set_var: 

The above is split into:

fb_check_var() - see if the requested var is compatible
                 and if not, round up to the next
                 legal value

fb_set_par()  - set the hardware based on the current
                var
>     fb_get_cmap:

gone

>     fb_set_cmap:

replaced by fb_setcolreg()

 
>     fb_ioctl:   

optional.

Additional required ops for 2.6.

fb_imageblit - expand monochrome to color and/or
               expand 8-bit pseudocolor to color

Generic version for packed-pixel: cfb_imageblit

fb_fillrect - fill rectangular area with solid color

Generic version for packed-pixel: cfb_fillrect


fb_copyarea - copy rectangular area

Generic version for packed-pixel: cfb_copyarea


> 
>   But the latest 2.6 fb_ops has removed these and
> there is entirely new set of functions. 
>   I tried to go to list archives but I could not find
> information. 
>   What functions in 2.6 fb_ops should to used to
> implement this old 2.4 set of functions?

Look at skeletonfb.c for comments.  The simplest
framebuffer driver you can start with is vfb.c


Tony