Some programmers want to run certain functions during programmer

shutdown, but the function choice depends on the code path taken during
programmer init.
Rather than rebuilding the whole init logic in the shutdown function, it
is now possible to register functions for execution on programmer
shutdown.
The behaviour is similar to atexit(), but the registered functions will
be run on programmer shutdown instead of on exit and the functions will
be called with a void * argument that is specified on registration.
Registered functions must have the prototype
void function(void *);
and will be executed in reverse registration order directly before
calling the programmer-specific shutdown() function. It is recommended
to have shutdown() only disable programmer/hardware access and leave all
code path sensitive shutdown to functions registered with
register_shutdown().

The most prominent use case is resetting the EC after flashing on
laptops.

Note: There are quite a few code paths in flashrom which proceed to
terminate flashrom without any programmer shutdown. Those code paths
will not get the benefit of register_shutdown() and they should be
changed wherever possible.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>


git-svn-id: https://code.coreboot.org/svn/flashrom/trunk@904 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

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