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Date: Tue, 11 Sep 2012 16:31:27 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: Prabhakar Lad <prabhakar.lad@...com>
Cc: LMML <linux-media@...r.kernel.org>,
dlos <davinci-linux-open-source@...ux.davincidsp.com>,
linux-kernel@...r.kernel.org,
Manjunath Hadli <manjunath.hadli@...com>,
linux-doc@...r.kernel.org, Hans Verkuil <hans.verkuil@...co.com>,
Sakari Ailus <sakari.ailus@....fi>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Mauro Carvalho Chehab <mchehab@...radead.org>,
Hans de Goede <hdegoede@...hat.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Guennadi Liakhovetski <g.liakhovetski@....de>,
Rob Landley <rob@...dley.net>
Subject: Re: [PATCH v3] media: v4l2-ctrl: add a helper function to modify the menu
On Tue 11 September 2012 16:23:38 Prabhakar Lad wrote:
> From: Lad, Prabhakar <prabhakar.lad@...com>
>
> Add a helper function to modify the menu, max and default value
> to set.
>
> Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
> Signed-off-by: Manjunath Hadli <manjunath.hadli@...com>
> Cc: Hans Verkuil <hans.verkuil@...co.com>
> Cc: Sakari Ailus <sakari.ailus@....fi>
> Cc: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Mauro Carvalho Chehab <mchehab@...radead.org>
> Cc: Hans de Goede <hdegoede@...hat.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Guennadi Liakhovetski <g.liakhovetski@....de>
> Cc: Rob Landley <rob@...dley.net>
Thanks!
Reviewed-by: Hans Verkuil <hans.verkuil@...co.com>
Regards,
Hans
> ---
> 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);
> +
> +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
> ===============
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index d731422..d89b460 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -2666,3 +2666,20 @@ unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
> return 0;
> }
> EXPORT_SYMBOL(v4l2_ctrl_poll);
> +
> +/* Helper function for modifying the menu */
> +void v4l2_ctrl_modify_menu(struct v4l2_ctrl *ctrl, const char * const *qmenu,
> + s32 max, u32 menu_skip_mask, s32 def)
> +{
> + if (WARN_ON(ctrl->type != V4L2_CTRL_TYPE_MENU || qmenu == NULL))
> + return;
> +
> + if (WARN_ON(def < 0 || def > max))
> + return;
> +
> + ctrl->qmenu = qmenu;
> + ctrl->maximum = max;
> + ctrl->menu_skip_mask = menu_skip_mask;
> + ctrl->cur.val = ctrl->val = ctrl->default_value = def;
> +}
> +EXPORT_SYMBOL(v4l2_ctrl_modify_menu);
> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> index 776605f..5303489 100644
> --- a/include/media/v4l2-ctrls.h
> +++ b/include/media/v4l2-ctrls.h
> @@ -488,6 +488,17 @@ static inline void v4l2_ctrl_unlock(struct v4l2_ctrl *ctrl)
> mutex_unlock(ctrl->handler->lock);
> }
>
> +/**
> + * v4l2_ctrl_modify_menu() - This function is used to modify the menu.
> + * @ctrl: The control whose menu should be modified.
> + * @qmenu: The new menu.
> + * @max: Maximum value of the control.
> + * @menu_skip_mask: The control's skip mask for menu controls.
> + * @def: The default value for control to be set.
> + */
> +void v4l2_ctrl_modify_menu(struct v4l2_ctrl *ctrl, const char * const *qmenu,
> + 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.
> *
>
--
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