I don't know what it really is either but the comments are the following.
if (frequency > 300000000)
{
printk(" %s : Tuner :FC0012 V-band (GPIO6 high)\n", __FUNCTION__);
}
else
{
printk(" %s : Tuner :FC0012 U-band (GPIO6 low)\n", __FUNCTION__);
}
I looked into both mechanisms but can't really decide which one would
be the best one for this. What is the correct ioctl constant to listen
for or do I define an own constant? And how is the ioctl command
issued within the demod driver?
Thomas
2012/4/18 Antti Palosaari <crope@xxxxxx>:
> On 18.04.2012 20:18, Thomas Mair wrote:
>>
>> I have been working on the driver over the past days and been making
>> some progress. Right now I am stuck with a small problem that I have
>> no idea how to deal with.
>>
>> It seems that the fc0012 tuner supports V-Band and U-Band. To switch
>> between those modes a GPIO output value needs to be changed. In the
>> original Realtek driver this is done at the beginning of the
>> set_parameters callback. Is there a different callback that can be
>> used for this or is it ok to write a RTL2832u register from the
>> demodulator code?
>
>
> Aah, I suspect it is antenna switch or LNA GPIO. You don't say what is
> meaning of that GPIO...
> If it is FC0012 input, which I think it is not, then you should use FE
> callback (named as callback too) with DVB_FRONTEND_COMPONENT_TUNER param.
> But I suspect it is not issue.
>
> So lets introduce another solution. It is fe_ioctl_override. Use it.
>
> You will find good examples both cases using following GIT greps
> git grep fe_ioctl_override drivers/media
> git grep FRONTEND_COMPONENT
>
> Antti
> --
> http://palosaari.fi/
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