linux-kernel - Re: [linux-dvb] [PATCH] Userspace tuner

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Message-ID: <46EB02BC.7000000@gmail.com>
Date:	Sat, 15 Sep 2007 01:53:00 +0400
From:	Manu Abraham <abraham.manu@...il.com>
To:	Aidan Thornton <makosoft@...glemail.com>
CC:	Michael Krufky <mkrufky@...uxtv.org>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	"video4linux-list@...hat.com" <video4linux-list@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-dvb@...uxtv.org" <linux-dvb@...uxtv.org>
Subject: Re: [linux-dvb] [PATCH] Userspace tuner

Aidan Thornton wrote:

> 
> I think this will require a rethink of either how the em2880-dvb
> driver works or how frontend drivers work. The current API expects
> users to initialise their frontend and then bind a tuner to it.
> em2880-dvb is a sort of subdriver that attaches to the main driver,
> and doesn't have any control over when or how it initialises its
> tuner, so it can't delay tuner initialisation until the frontend has
> been initialised. (I don't think it's the only hybrid driver that
> works this way either). Of course, I could be missing something.

The em28xx/xc3028 is in fact not too complex. Just for sake of
demonstration, some time back i had posted a dummy driver how it can be
done in a nice and clean way as an example.

The patch assumes some additional standards, you can ignore them. But
you get the general idea from in there.
http://marc.info/?l=linux-video&m=117613833119350&w=2


> 
>> There is no reason why the Xceive driver cannot be merged into the
>> current development tree using the hybrid tuner framework as it stands
>> today.
> 
> I'm not convinced this is entirely true. In order to avoid unnecessary
> reinitialisation of the device, the driver needs to know whether the
> device is in analog or digital mode, and I can't see a way of doing it
> with the current API. (I think existing drivers, such as the xc2028
> driver in one branch, use the older analog API and make the digital
> driver a wrapper around it.) Again, I may be missing something.

You can read this post also for some additional information.
http://marc.info/?l=linux-video&m=117922735929375&w=2

Use the ideas as you deem fit. ;-)

Manu
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