On Saturday 01 September 2012 19:11:56 Sakari Ailus wrote: > Hi Prabhakar, > > On Sat, Sep 01, 2012 at 08:23:58PM +0530, Prabhakar Lad wrote: > > On Sat, Sep 1, 2012 at 7:52 PM, Laurent Pinchart > > > > <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote: > > > Hi Sakari, > > > > > > On Saturday 01 September 2012 12:57:07 Sakari Ailus wrote: > > >> On Wed, Aug 29, 2012 at 08:11:50PM +0530, Prabhakar Lad wrote: > > > [snip] > > > > > >> > For test pattern you meant control to enable/disable it ? > > >> > > >> There are two approaches I can think of. > > >> > > >> One is a menu control which can be used to choose the test pattern (or > > >> disable it). The control could be standardised but the menu items would > > >> have to be hardware-specific since the test patterns themselves are > > >> not standardised. > > > > > > Agreed. The test patterns themselves are highly hardware-specific. > > > > > > From personal experience with sensors, most devices implement a small, > > > fixed set of test patterns that can be exposed through a menu control. > > > However, some devices also implement more "configurable" test patterns. > > > For instance the MT9V032 can generate horizontal, vertical or diagonal > > > test patterns, or a uniform grey test pattern with a user-configurable > > > value. This would then require two controls. > > > > two controls I didn't get it ? When we have menu itself with a list of > > standard patterns why would two controls be required ? > > Two are not required. A single menu control will do. That's correct, in this case a single menu control will do. We would only need multiple controls if the device exposes test pattern parameters, as in the MT9V032 sensor example. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
