On Thu, Jul 5, 2012 at 5:05 PM, Antti Palosaari <cr...@iki.fi> wrote:
> On 07/05/2012 05:16 PM, Mauro Carvalho Chehab wrote:
>> Implement API support to return AFC frequency shift, as this device
>> supports it. The only other driver that implements it is tda9887,
>> and the frequency there is reported in Hz. So, use Hz also for this
>> tuner.
> What is AFC and why it is needed?

AFC is short for Automatic Frequency Control, by which a tuner
automatically fine-tunes the frequency for the best reception,
compensating for small offsets and oscillator frequency drift.
This is however done automatically on the tuner, so its configuration
is read-only. Aside from being a "nice to know" statistic, getting
hold of the AFC frequency shift does as far as I know not have any
practical uses related to properly operating the tuner.

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