[linux-dvb] [PATCH] Fix the min/max frequencies of some DVB-C frontends

Manu Abraham abraham.manu at gmail.com
Tue Aug 7 01:17:21 CEST 2007


On 8/6/07, Michael Krufky <mkrufky at linuxtv.org> wrote:
>
> Now I'm beginning to have doubts about Oliver's original patch:
>
> dvb_frontend: Range check of frequency and symbol rate
> http://linuxtv.org/hg/v4l-dvb/rev/8186a34dd0a6
>
> Should we be checking fe->ops.tuner_ops.info.frequency_min|max , instead of
> fe->ops.info.frequency_min|max ???


Ideally, what's provided by the demod and not the tuner max/min. The
tuners max/min should be checked by the demod on setting params.

The upper/lower limits in the demodulator drivers, came from the
concept of a frontend as a whole. Independant bounds do not make sense
(except internally -- It is the demod driver that which sets
parameters for the tuner. The external world doesn't need to know
what's the limit of the tuner, but only of the frontend as a whole).

Ideally, the demodulator should just demodulate only. There are some
cases, there are some cases which are not.

Manu



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