[linux-dvb] Re: [PATCHES] Frontend kernel i2c conversion.

[Gerd Knorr <kraxel@bytesex.org>]

On Tue, Jul 20, 2004 at 02:37:04PM +0200, Johannes Stezenbach wrote:
> Hi Gerd,
> 
> I hope you don't mind if I address you directly in this
> thread, I don't know if you're still reading linux-dvb.

I'm still subscribed, but read it _very_ briefly only at the moment ...

> What's your opinion on this matter? Would you accept a patch
> for bttv-i2c to expose the hooks required by DVB? Or do can
> you propose a different solution?

In 2.6 the hooks are there already.  It's done via sysfs.
You'll have to register as sub-driver via bttv_sub_register().
bttv creates virtual devices and if a matching driver exists
it will be attached.

The sub-drivers get passed a pointer to struct bttv_core which should
have everything you need.  There are a few helper functions for gpio
access which accept bttv_core to identify the correct card.  There is a
pointer to the pci_dev, so you can look for the matching .1 pci function
for ts stream xfer.  And also a pointer to i2c_adapter, so you can do
any i2c transfers you want using the usual functions (i2c_master_* in
i2c-core.c).

I think right now only ir-kbd-gpio.c uses that interface, so you can
have a look there for sample code.

  Gerd

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