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Date: Wed, 19 Sep 2012 00:24:38 +0530
From: Prabhakar Lad <prabhakar.csengg@...il.com>
To: LMML <linux-media@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
Mauro Carvalho Chehab <mchehab@...radead.org>,
linux-doc@...r.kernel.org, "Lad, Prabhakar" <prabhakar.lad@...com>,
Manjunath Hadli <manjunath.hadli@...com>,
Hans Verkuil <hans.verkuil@...co.com>,
Sakari Ailus <sakari.ailus@....fi>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Hans de Goede <hdegoede@...hat.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Guennadi Liakhovetski <g.liakhovetski@....de>,
Rob Landley <rob@...dley.net>
Subject: [PATCH v4] media: v4l2-ctrl: add a helper function to add standard control with driver specific menu
From: Lad, Prabhakar <prabhakar.lad@...com>
Add helper function v4l2_ctrl_new_std_menu_items(), which adds
a standard menu control, with driver specific menu.
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>
---
Changes for v4:
1: Rather then adding a function to modify the menu, added a helper
function, that creates a new standard control with user specific
menu.
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 | 25 ++++++++++++++++++++++++
drivers/media/v4l2-core/v4l2-ctrls.c | 28 +++++++++++++++++++++++++++
include/media/v4l2-ctrls.h | 23 ++++++++++++++++++++++
3 files changed, 76 insertions(+), 0 deletions(-)
diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt
index 43da22b..ad8e172 100644
--- a/Documentation/video4linux/v4l2-controls.txt
+++ b/Documentation/video4linux/v4l2-controls.txt
@@ -136,11 +136,25 @@ Or alternatively for integer menu controls, by calling v4l2_ctrl_new_int_menu:
const struct v4l2_ctrl_ops *ops,
u32 id, s32 max, s32 def, const s64 *qmenu_int);
+Standard menu controls with driver specific menu are added by calling
+v4l2_ctrl_new_std_menu_items:
+
+ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(
+ struct v4l2_ctrl_handler *hdl,
+ const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
+ s32 skip_mask, s32 def, const char * const *qmenu_user);
+
These functions are typically called right after the v4l2_ctrl_handler_init:
static const s64 exp_bias_qmenu[] = {
-2, -1, 0, 1, 2
};
+ static const char * const test_pattern[] = {
+ "Disabled",
+ "Vertical Bars",
+ "Solid Black",
+ "Solid White",
+ };
v4l2_ctrl_handler_init(&foo->ctrl_handler, nr_of_controls);
v4l2_ctrl_new_std(&foo->ctrl_handler, &foo_ctrl_ops,
@@ -156,6 +170,9 @@ These functions are typically called right after the v4l2_ctrl_handler_init:
ARRAY_SIZE(exp_bias_qmenu) - 1,
ARRAY_SIZE(exp_bias_qmenu) / 2 - 1,
exp_bias_qmenu);
+ v4l2_ctrl_new_std_menu_items(&foo->ctrl_handler, &foo_ctrl_ops,
+ V4L2_CID_TEST_PATTERN, ARRAY_SIZE(test_pattern) - 1, 0,
+ 0, test_pattern);
...
if (foo->ctrl_handler.error) {
int err = foo->ctrl_handler.error;
@@ -185,6 +202,14 @@ v4l2_ctrl_new_std_menu in that it doesn't have the mask argument and takes
as the last argument an array of signed 64-bit integers that form an exact
menu item list.
+The v4l2_ctrl_new_std_menu_items funtion is very similar as
+v4l2_ctrl_new_std_menu but takes a extra parameter qmenu_user, which is
+driver specific menu but yet a standard menu control.
+A good example for this control 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.
+
Note that if something fails, the function will return NULL or an error and
set ctrl_handler->error to the error code. If ctrl_handler->error was already
set, then it will just return and do nothing. This is also true for
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index d731422..9ac1b75 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1649,6 +1649,34 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
}
EXPORT_SYMBOL(v4l2_ctrl_new_std_menu);
+/* Helper function for standard menu controls with user defined menu */
+struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
+ const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
+ s32 mask, s32 def, const char * const *qmenu_user)
+{
+ const char * const *qmenu = v4l2_ctrl_get_menu(id);
+ const char *name;
+ enum v4l2_ctrl_type type;
+ s32 min;
+ s32 step;
+ u32 flags;
+
+ if (!qmenu) {
+ handler_set_err(hdl, -EINVAL);
+ return NULL;
+ }
+
+ v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags);
+ if (type != V4L2_CTRL_TYPE_MENU) {
+ handler_set_err(hdl, -EINVAL);
+ return NULL;
+ }
+ return v4l2_ctrl_new(hdl, ops, id, name, type,
+ 0, max, mask, def, flags, qmenu_user, NULL, NULL);
+
+}
+EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
+
/* Helper function for standard integer menu controls */
struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
const struct v4l2_ctrl_ops *ops,
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 776605f..e0dd392 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -351,6 +351,29 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
const struct v4l2_ctrl_ops *ops,
u32 id, s32 max, s32 mask, s32 def);
+/** v4l2_ctrl_new_std_menu_items() - Create a new standard V4L2 menu control
+ * with driver specific menu.
+ * @hdl: The control handler.
+ * @ops: The control ops.
+ * @id: The control ID.
+ * @max: The control's maximum value.
+ * @mask: The control's skip mask for menu controls. This makes it
+ * easy to skip menu items that are not valid. If bit X is set,
+ * then menu item X is skipped. Of course, this only works for
+ * menus with <= 32 menu items. There are no menus that come
+ * close to that number, so this is OK. Should we ever need more,
+ * then this will have to be extended to a u64 or a bit array.
+ * @def: The control's default value.
+ * @qmenu_user:The new menu.
+ *
+ * Same as v4l2_ctrl_new_std_menu().but @qmenu_user will be the menu to
+ * which the control will be pointing to.
+ *
+ */
+struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
+ const struct v4l2_ctrl_ops *ops, u32 id, s32 max,
+ s32 mask, s32 def, const char * const *qmenu_user);
+
/** v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control.
* @hdl: The control handler.
* @ops: The control ops.
--
1.7.0.4
--
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