Messages in this thread | | | From | Laurent Pinchart <> | Subject | Re: [PATCH v3] media: v4l2-ctrl: add a helper function to modify the menu | Date | Thu, 13 Sep 2012 03:15:57 +0200 |
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Hi Prabhakar,
Thanks for the patch.
On Tuesday 11 September 2012 19:53:38 Prabhakar Lad wrote: > From: Lad, Prabhakar <prabhakar.lad@ti.com> > > Add a helper function to modify the menu, max and default value > to set. > > Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com> > Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com> > Cc: Hans Verkuil <hans.verkuil@cisco.com> > Cc: Sakari Ailus <sakari.ailus@iki.fi> > Cc: Sylwester Nawrocki <s.nawrocki@samsung.com> > Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > Cc: Mauro Carvalho Chehab <mchehab@infradead.org> > Cc: Hans de Goede <hdegoede@redhat.com> > Cc: Kyungmin Park <kyungmin.park@samsung.com> > Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de> > Cc: Rob Landley <rob@landley.net> > --- > Changes for v3: > 1: Fixed style/grammer issues as pointed by Hans. > Thanks Hans for providing the description. > > Changes for v2: > 1: Fixed review comments from Hans, to have return type as > void, add WARN_ON() for fail conditions, allow this fucntion > to modify the menu of custom controls. > > Documentation/video4linux/v4l2-controls.txt | 29 ++++++++++++++++++++++++ > drivers/media/v4l2-core/v4l2-ctrls.c | 17 +++++++++++++++ > include/media/v4l2-ctrls.h | 11 ++++++++++ > 3 files changed, 57 insertions(+), 0 deletions(-) > > diff --git a/Documentation/video4linux/v4l2-controls.txt > b/Documentation/video4linux/v4l2-controls.txt index 43da22b..01d0a82 100644 > --- a/Documentation/video4linux/v4l2-controls.txt > +++ b/Documentation/video4linux/v4l2-controls.txt > @@ -367,6 +367,35 @@ it to 0 means that all menu items are supported. > You set this mask either through the v4l2_ctrl_config struct for a custom > control, or by calling v4l2_ctrl_new_std_menu(). > > +There are situations where menu items may be device specific. In such cases > the > +framework provides a helper function to change the menu: > + > +void v4l2_ctrl_modify_menu(struct v4l2_ctrl *ctrl, const char * const > *qmenu, > + s32 max, u32 menu_skip_mask, s32 def);
Sorry if this is a stupid question, but wouldn't it be better to add a function to create a custom menu instead of modifying it afterwards ?
> + > +A good example is the test pattern control for capture/display/sensors > devices > +that have the capability to generate test patterns. These test patterns are > +hardware specific, so the contents of the menu will vary from device to > device. > + > +This helper function is used to modify the menu, max, mask and the default > +value of the control. > + > +Example: > + > + static const char * const test_pattern[] = { > + "Disabled", > + "Vertical Bars", > + "Solid Black", > + "Solid White", > + NULL, > + }; > + struct v4l2_ctrl *test_pattern_ctrl = > + v4l2_ctrl_new_std_menu(&foo->ctrl_handler, &foo_ctrl_ops, > + V4L2_CID_TEST_PATTERN, V4L2_TEST_PATTERN_DISABLED, 0, > + V4L2_TEST_PATTERN_DISABLED); > + > + v4l2_ctrl_modify_menu(test_pattern_ctrl, test_pattern, 3, 0, > + V4L2_TEST_PATTERN_DISABLED); > > Custom Controls > ===============
-- Regards,
Laurent Pinchart
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