Re: Access to SIM card when Modem is not "Powered"

[Denis Kenzior <denkenz@gmail.com>]

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Hi Pekka,

> That is also a problem. The other problem is that the party
> controlling the modem power state is supposed to keep GPIO lines in
> known position for a while after the modem has indicated it has been
> powered down. In an N900 running maemo, a daemon called sscd does
> that. sscd exits only after modem has been safely powered down during
> reboot and shutdown. If ofonod does the controlling, it should hang
> around after power off for a while, too.

So I'm still having trouble understanding the issue.  When oFono calls 
disable, the driver is expected to take all necessary steps to disable the 
modem.  If that means waiting N seconds after the command has been sent, so be 
it.  During shutdown of the daemon, oFonod waits for a grace period and waits 
on any devices that are being shut down.  In effect it "hangs around" after 
power off.

If I'm still on the wrong track, someone please explain it to me better.

> 
> Another solution is to use sscd-like daemon also with ofono (the oFono
> Powered property would then just follow the power state of the modem).

Automatic powerup is actually possible from the driver.  See HFP driver for 
details.

> > We reply with the busy error, you're correct.  However, I don't really
> > see anything better we can do here, do you have any suggestions?
> 
> Keep the target state around somewhere, or call enable/disable
> regardless of the current state of the Powered property?
> 

Note that oFono does not record the powered preferences, ConnMan is 
responsible for that.

Sending a disable when we are already disabled would be wrong and would break 
some plugins.

And I'm still having trouble understanding why you want this.  Please give 
concrete use-cases.

Regards,
-Denis