On Tue, 2009-06-23 at 11:39 +0800, Terry Wu wrote:
> Hi,
>     I add the following codes in the cx23885_initialize() of cx25840-core.c:
>       /* Drive GPIO2 (GPIO 19~23) direction and values for DVB-T */
>       cx25840_and_or(client, 0x160, 0x1d, 0x00);
>       cx25840_write(client, 0x164, 0x00);
>     Before that, the tuning status is 0x1e, but <0> service found.
>     Now, I can watch DVB-T (Taiwan, 6MHz bandwidth).
>     And if you are living in Australia, you should update the
> tuner-xc2028.c too:
> http://tw1965.myweb.hinet.net/Linux/v4l-dvb/20090611-TDA18271HDC2/tuner-xc2028.c
> Best Regards,
> Terry


As I think of potential ways to handle this, I thought we may need to
add a v4l2_subdev interface for setting and reading GPIO's.

A CX23418 based board has a Winbond W8360x GPIO IC connected via I2C.
When I get to writing a v4l2_subdevice driver for that, it will need
such an internal interface as well.



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