[linux-dvb] Re: Autoscanning

[Wolfram Joost <dvbmailing@frokaschwei.de>]

Hi,

> > I would add two ioctls:
> >
> > - FE_START_SCAN with the lowest and highest frequency to scan as
> > paramters. - FE_CONTINUE_SCAN
> >
> > After the FE_START_SCAN the kernel-thread monitors the fe-status and send
> > an event if the fe locks or an event when the fe finished scanning.
> > Monitoring than stopps.
> >
> > The application then can get more information by requesting some sections
> > and of cause it should get the channel-parameters with a FE_GET_FRONTEND
> > ioctl. Then, the application continues scanning by issueing the
> > FE_CONTINUE_SCAN ioctl.
>
> sounds good so far.
>
> > The kernel-thread starts monitoring the fe-status again.
>
> in well-designed interrupt-driven STBs we don't need any frontend thread
> at all.

It isn't well designed... IIRC the interrupt-pin off the mt352 isn't available 
at the fe-connector.

> I would propose a 'scan in progress' flag instead (it maps well to the
> internal '352 state bit), this allows us to distinguish between
> weak/instable transponders (lock lost between scan interrupt and
> FE_GET_STATUS), scan-in-progress (no lock because no signal) and end of
> scan.

Sounds good.

> :) Are you volunteering to implement this feature?

I've only one DVB-T channel here and I'm short on time :(.

Wolfram