[Nut-upsdev] RFC: allow HID subdriver's to register ups.conf

j T hyvan_trant at hotmail.com
Mon Jun 5 09:31:27 UTC 2006

Hi Peter

Don't ya just love insomnia? ;-) While I wasn't managing to get any sleep 
last night, my head was running over the whole driver/subdriver command 
line/ups.conf options thing and I *think* I have a way to make it work.

I've just found out that I'm not working today or tomorrow, so I'm going to 
have a bit of an explore of my idea to find out how well it works.

Basically the idea is to split things up for drivers that support 

In order to avoid break exisiing drivers, I'm planning to add a 
driver_has_subdrivers variable at the top of main.c, initialised to 0, which 
can then be overridden by newhidups (and any other driver that has 
subdrivers with command-line options (not that any exist at this time so far 
as I know...)) as driver_has_subdrivers=1 . Selection of the operation with 
respect to command-line handling then gets controlled by "if 

This should mean that essentially, nothing has changed for the other 
drivers, and they should compile and run as before. There will be a few 
extra comparison operations performed when the driver is run, but on a 
modern machine, the few extra processing cycles used shouldn't make any 
noticeable difference to the execiution speed of the driver.

Now for the guts of the changes....

I'm planning to modfy the handling of -x options so that options that are 
not handled by the driver in the current processing switch get collected 
into a new variable, rather than simply failing.

main() then runs initups(). For subdriver-drivers, once the subdriver has 
been selected, initups() will call extendvatable()/init(), as previously 

After initups() returns, a second switch in main() will process the 
outstanding -x options and the failure for "bad" options will occur at 
*that* point instead.

I *think* that this should all work, but I need to actually *try* it to be 
sure... it sounds and looks right to me, but I might have missed something 
in the current code that will make it not work.

I'll probably post an update as to how this goes later today.

Jo Turner

jT | mail to: hyvan_trant at hotmail.com
** | website: http://www.chiark.greenend.org.uk/~jsturner/

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