[linux-dvb] [patch] Add support for different tuning algorithms

Manu Abraham abraham.manu at gmail.com
Tue Nov 15 21:56:50 CET 2005


Johannes Stezenbach wrote:

>- program PLL for frequency to scan
>- program demod for scanning
>- poll some demod register until it signals completion
>  (or use irq if available)
>  
>

This is possible with the adaptive algo in the sense that the relevant 
function can return values for the relevant . For example, 
center_carrier()  returns the status when that operation is complete etc ..

>- pass result to userspace (e.g. event, wake up poll(2), ioctl)
>  
>

But these functions, i think will need to stay in kernel, to avoid too 
many transactions, IOCTL's from userspace to the driver.

>- get frequency step for reprogramming PLL from driver
>- repeat
>
>I know the driver software from the fe vendors often uses
>floating point and makes it look complicated, but IMHO
>it doesn't have to.
>
>  
>

Yeah, i have a small implementation without that complication, but not 
yet finished though.


Manu




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