From: Lad, Prabhakar <prabhakar.lad@xxxxxx> Signed-off-by: Lad, Prabhakar <prabhakar.lad@xxxxxx> Signed-off-by: Manjunath Hadli <manjunath.hadli@xxxxxx> Cc: Hans Verkuil <hans.verkuil@xxxxxxxxx> Cc: Sakari Ailus <sakari.ailus@xxxxxx> Cc: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxx> Cc: Hans de Goede <hdegoede@xxxxxxxxxx> Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> Cc: Rob Landley <rob@xxxxxxxxxxx> --- Documentation/video4linux/v4l2-controls.txt | 26 +++++++++++++++++++++++++ drivers/media/v4l2-core/v4l2-ctrls.c | 28 +++++++++++++++++++++++++++ include/media/v4l2-ctrls.h | 14 +++++++++++++ 3 files changed, 68 insertions(+), 0 deletions(-) diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt index 43da22b..54a9539 100644 --- a/Documentation/video4linux/v4l2-controls.txt +++ b/Documentation/video4linux/v4l2-controls.txt @@ -196,6 +196,32 @@ the error code at the end. Saves a lot of repetitive error checking. It is recommended to add controls in ascending control ID order: it will be a bit faster that way. +2.1) Changing the menu of a standard control: +There are suitations when the control is standard but the menu items may be +device specific, in such cases the framework provides the helper to do that. + +struct v4l2_ctrl * v4l2_ctrl_modify_menu(struct v4l2_ctrl *ctrl, + const char * const *qmenu, s32 min, s32 max, + u32 menu_skip_mask, s32 def); + +This helper, function is used to modify the menu, min, max, mask and +the default value to set. +Example for usage: + static const char * const test_pattern[] = { + "Disabled", + "Vertical Bars", + "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, 0, 5, 0x3, 0); + 3) Optionally force initial control setup: v4l2_ctrl_handler_setup(&foo->ctrl_handler); diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c index d731422..ac0fb28 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls.c +++ b/drivers/media/v4l2-core/v4l2-ctrls.c @@ -2666,3 +2666,31 @@ unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait) return 0; } EXPORT_SYMBOL(v4l2_ctrl_poll); + +/* Helper function for standard menu controls to modify the menu */ +struct v4l2_ctrl *v4l2_ctrl_modify_menu(struct v4l2_ctrl *ctrl, + const char * const *qmenu, s32 min, + s32 max, u32 menu_skip_mask, s32 def) +{ + if (ctrl->type != V4L2_CTRL_TYPE_MENU) + return NULL; + + if (qmenu == NULL) + return NULL; + + /* Determine if it is standard menu control */ + if (!v4l2_ctrl_get_menu(ctrl->id)) + return NULL; + + if ((def > max) || (max < min)) + return NULL; + + ctrl->qmenu = qmenu; + ctrl->minimum = min; + ctrl->maximum = max; + ctrl->menu_skip_mask = menu_skip_mask; + ctrl->cur.val = ctrl->val = ctrl->default_value = def; + + return ctrl; +} +EXPORT_SYMBOL(v4l2_ctrl_modify_menu); diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h index 776605f..5b0ea04 100644 --- a/include/media/v4l2-ctrls.h +++ b/include/media/v4l2-ctrls.h @@ -488,6 +488,20 @@ static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl) mutex_unlock(ctrl->handler->lock); } +/** + * v4l2_ctrl_modify_menu() - Modify the menu. This function is used when the + * control is standard but the menu is specific to device. + * @ctrl: The control to change the menu. + * @qmenu: The menu to which control will point to. + * @min: Minimum value of the control. + * @max: Maximum valur of the control. + * @menu_skip_mask: The control's skip mask for menu controls. + * @def: The default value for control. + */ +struct v4l2_ctrl *v4l2_ctrl_modify_menu(struct v4l2_ctrl *ctrl, + const char * const *qmenu, s32 min, + s32 max, u32 menu_skip_mask, s32 def); + /** v4l2_ctrl_g_ctrl() - Helper function to get the control's value from within a driver. * @ctrl: The control. * -- 1.7.0.4 -- 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