[ECOS] DEVIO table change

[ECOS] DEVIO table change

[Grant Edwards]

How do I determine (at compile time) with which version of the
kernel a driver is being used?

Maintaining parallel drivers for 1.3.1 and CVS would require a
lot of work, so I'd like my driver to work with both 1.3.1 and
CVS code. But the DEVIO table has changed.  I can't seem to
find a kernel version or devio version macro to test in my
driver sources to determine whether to include a select
function in the DEVIO macro.

It looks like I might be able to make the decision on whether
CHAR_DEVIO_TABLE is defined.

Would it be possible to include some sort of kernel version or
kernel API version macro in the one of the eCos kernel header
files so that a single driver can support multiple versions of
the kernel?

-- 
Grant Edwards
grante@visi.com

Re: [ECOS] DEVIO table change

[Bart Veer]

>>>>> "Grant" == Grant Edwards <grante@visi.com> writes:

    Grant> How do I determine (at compile time) with which version of
    Grant> the kernel a driver is being used?

    Grant> Maintaining parallel drivers for 1.3.1 and CVS would
    Grant> require a lot of work, so I'd like my driver to work with
    Grant> both 1.3.1 and CVS code. But the DEVIO table has changed. I
    Grant> can't seem to find a kernel version or devio version macro
    Grant> to test in my driver sources to determine whether to
    Grant> include a select function in the DEVIO macro.

    Grant> It looks like I might be able to make the decision on
    Grant> whether CHAR_DEVIO_TABLE is defined.

    Grant> Would it be possible to include some sort of kernel version
    Grant> or kernel API version macro in the one of the eCos kernel
    Grant> header files so that a single driver can support multiple
    Grant> versions of the kernel?

Actually, the kernel version macros do exist:

  #include <pkgconf/system.h>
  #ifdef CYGPKG_KERNEL_CURRENT
  ...
  #endif

With current versions of the host-side tools there will also be
definitions for CYGNUM_KERNEL_VERSION_MAJOR, _MINOR and _RELEASE which
can be used for numerical comparisons in a #if, but that functionality
was added after the 1.3.1 release.

Bart

Re: [ECOS] DEVIO table change

[Jonathan Larmour]

Bart Veer wrote:
> 
> >>>>> "Grant" == Grant Edwards <grante@visi.com> writes:
> 
>     Grant> Would it be possible to include some sort of kernel version
>     Grant> or kernel API version macro in the one of the eCos kernel
>     Grant> header files so that a single driver can support multiple
>     Grant> versions of the kernel?
> 
> Actually, the kernel version macros do exist:
> 
>   #include <pkgconf/system.h>
>   #ifdef CYGPKG_KERNEL_CURRENT
>   ...
>   #endif
> 
> With current versions of the host-side tools there will also be
> definitions for CYGNUM_KERNEL_VERSION_MAJOR, _MINOR and _RELEASE which
> can be used for numerical comparisons in a #if, but that functionality
> was added after the 1.3.1 release.

But that's okay, because if those macros aren't defined, you know it's too
old :-).

Jifl
-- 
Red Hat, 35 Cambridge Place, Cambridge, UK. CB2 1NS  Tel: +44 (1223) 728762
"Plan to be spontaneous tomorrow."  ||  These opinions are all my own fault