Re: [STATUS] fbdev api.

[Antonino D. <ad...@po...>]

On Tue, 2002-12-03 at 02:07, James Simmons wrote:
> 
> Hi!
> 
>   I have a new patch avaiable. It is against 2.5.50. The patch is at 
> 
> http://phoenix.infradead.org/~jsimmons/fbdev.diff.gz
> 
> Have fun!!!!
> 
> Drivers ported are: (Give them a try)
> 
>     ATI Mach 64
>     ATI 128
>     VESA 
>     VGA16
>     HGA
>     NIVIDA
>     NEOMAGIC
>      
> The BIG changes are:
> 
> 1) The seperation of the console code out of the fbdev drivers. 
> 
> 2) Total modularity of the frmaebuffer console system. Yes that is 
>    right. You can build it has modules. Great for testing.
> 
> The following are results of the new changes which I have tested.
> 
>    With my VIA laptop with my neomagic card I was able to build it with 
> vgacon and no fbcon. Then I insmod neofb and the soft accel (cfb*.c) 
> needed. It loading and did NOT change the video hardware state. At this 
> point I could run fbdev apps including a X server using /dev/fb solely. 
> On opening /dev/fb0 the graphics hardware state changed. In theory I could 
> exit X and get vgacon back. In order to do this I have to reset the 
> hardware back to vga text mode in the fb_release function. It can be done 
> but I haven't done it yet.
>    With the second experiment I was able to insmod the fonts and fbcon.o.
> Then it switched from vgacon to fbcon. In theory I could again call the 
> release function and reset the hardware back to a text mode state. All 
> that is needed is the hardware specific code to do this.
> 
> Things to be done:
> 
>     1) A few bugs in fbcon to hammer out. 
>  
>     2) Fbcon to support changing resolution via the console layer. 
> 
>     3) Move the logo code out of fbcon.c to fbmem.c. With pure fbdev 
>        you need something to let you know things worked.
> 
>     4) Software rotation.
> 

Attached is a patch against linux-2.5.50 + your fbdev.diff.

a.  changed __MOD_INC_USE_COUNT and __MOD_DEC_USE_COUNT to
try_module_get() and module_put() respectively.  This will allow modules
to be safely unloaded.

b.  Another rewrite of fbcon_show_logo() so it's more understandable
(hopefully).  I also added support for the rest of the visuals, but
untested yet.  

Tested with different hardware (little endian):
truecolor, directcolor, pseudocolor, vga 4-bit pseudocolor.  

Not tested:
static psuedocolor, mono01, and mono10.

c.  prevent fbcon module from loading if no fbdev is registered.  Also
made fbcon module unsafe to unload (for now).  This is optional, of course.