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authorHans Verkuil <hans.verkuil@cisco.com>2014-04-27 10:22:17 +0400
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-07-17 18:56:47 +0400
commit0176077a813933a547b7a913377a87d615b7c108 (patch)
tree870aaec59c2a1f9328f582d5df1bce400a1f3b77 /include/media
parente6bee3685e732df82f48698254a36754cf15f0b0 (diff)
downloadlinux-0176077a813933a547b7a913377a87d615b7c108.tar.xz
[media] v4l2-ctrls: create type_ops
Since compound controls can have non-standard types we need to be able to do type-specific checks etc. In order to make that easy type operations are added. There are four operations: - equal: check if two values are equal - init: initialize a value - log: log the value - validate: validate a new value The v4l2_ctrl struct adds p_new and p_cur unions at the end of the struct. This union provides a standard way of accessing control types through a pointer, which greatly simplifies internal control processing. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'include/media')
-rw-r--r--include/media/v4l2-ctrls.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 9024daebdf3b..ddd9fdf1ac1a 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -36,6 +36,19 @@ struct v4l2_subscribed_event;
struct v4l2_fh;
struct poll_table_struct;
+/** union v4l2_ctrl_ptr - A pointer to a control value.
+ * @p_s32: Pointer to a 32-bit signed value.
+ * @p_s64: Pointer to a 64-bit signed value.
+ * @p_char: Pointer to a string.
+ * @p: Pointer to a compound value.
+ */
+union v4l2_ctrl_ptr {
+ s32 *p_s32;
+ s64 *p_s64;
+ char *p_char;
+ void *p;
+};
+
/** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
* @g_volatile_ctrl: Get a new value for this control. Generally only relevant
* for volatile (and usually read-only) controls such as a control
@@ -54,6 +67,23 @@ struct v4l2_ctrl_ops {
int (*s_ctrl)(struct v4l2_ctrl *ctrl);
};
+/** struct v4l2_ctrl_type_ops - The control type operations that the driver has to provide.
+ * @equal: return true if both values are equal.
+ * @init: initialize the value.
+ * @log: log the value.
+ * @validate: validate the value. Return 0 on success and a negative value otherwise.
+ */
+struct v4l2_ctrl_type_ops {
+ bool (*equal)(const struct v4l2_ctrl *ctrl,
+ union v4l2_ctrl_ptr ptr1,
+ union v4l2_ctrl_ptr ptr2);
+ void (*init)(const struct v4l2_ctrl *ctrl,
+ union v4l2_ctrl_ptr ptr);
+ void (*log)(const struct v4l2_ctrl *ctrl);
+ int (*validate)(const struct v4l2_ctrl *ctrl,
+ union v4l2_ctrl_ptr ptr);
+};
+
typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
/** struct v4l2_ctrl - The control structure.
@@ -89,6 +119,7 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
* value, then the whole cluster is in manual mode. Drivers should
* never set this flag directly.
* @ops: The control ops.
+ * @type_ops: The control type ops.
* @id: The control ID.
* @name: The control name.
* @type: The control type.
@@ -137,6 +168,7 @@ struct v4l2_ctrl {
unsigned int manual_mode_value:8;
const struct v4l2_ctrl_ops *ops;
+ const struct v4l2_ctrl_type_ops *type_ops;
u32 id;
const char *name;
enum v4l2_ctrl_type type;
@@ -164,6 +196,9 @@ struct v4l2_ctrl {
char *string;
void *p;
} cur;
+
+ union v4l2_ctrl_ptr p_new;
+ union v4l2_ctrl_ptr p_cur;
};
/** struct v4l2_ctrl_ref - The control reference.
@@ -217,6 +252,7 @@ struct v4l2_ctrl_handler {
/** struct v4l2_ctrl_config - Control configuration structure.
* @ops: The control ops.
+ * @type_ops: The control type ops. Only needed for compound controls.
* @id: The control ID.
* @name: The control name.
* @type: The control type.
@@ -241,6 +277,7 @@ struct v4l2_ctrl_handler {
*/
struct v4l2_ctrl_config {
const struct v4l2_ctrl_ops *ops;
+ const struct v4l2_ctrl_type_ops *type_ops;
u32 id;
const char *name;
enum v4l2_ctrl_type type;