On Mon, Feb 22, 2010 at 8:58 AM, Mauro Carvalho Chehab <mche...@redhat.com> wrote: >> Ok then. I'll add the 15-20 lines of code which add the extended >> controls mechanism to the 7115, which just operates as a passthrough >> for the older control interface. > > The better is to do the opposite: extended being the control interface and > the old calls as a passthrough, since the idea is to remove the old interface > after having all drivers converted.
I gave this a bit of thought, and I'm not sure what you are proposing is actually possible. Because the extended controls provides a superset of the functionality of the older user controls interface, it is possible to create a extended control callback which just passes through the request (since any user control can be converted into a extended control). However, you cannot convert the extended control results into the older user control format, since not all the information could be provided. In fact, I would be in favor of taking the basic logic found in cx18_g_ext_ctrls(), and making that generic to the videodev interface, such that any driver which provides a user control interface but doesn't provide an extended control function will work if the calling application makes an extended control call. This will allow userland applications to always use the extended controls API, even if the driver didn't explicitly add support for it. Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
