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authorHans Verkuil <hans.verkuil@cisco.com>2011-06-07 11:13:44 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-07-27 17:53:20 -0300
commit6e239399e5807132f86f64af6c659411c6a3d1a5 (patch)
treeeeb564a25341111f1c7d6e92137e910c4e4d37f3 /include
parentab892bac8438c5c2ff09a60d765d9b0c14941ba9 (diff)
downloadvexpress-lsk-6e239399e5807132f86f64af6c659411c6a3d1a5.tar.gz
[media] v4l2-ctrls: add control events
Whenever a control changes value or state an event is sent to anyone that subscribed to it. This functionality is useful for control panels but also for applications that need to wait for (usually status) controls to change value. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/videodev2.h29
-rw-r--r--include/media/v4l2-ctrls.h23
-rw-r--r--include/media/v4l2-event.h2
3 files changed, 47 insertions, 7 deletions
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index 8a4c309d234..baafe2f2e02 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -1791,6 +1791,7 @@ struct v4l2_streamparm {
#define V4L2_EVENT_ALL 0
#define V4L2_EVENT_VSYNC 1
#define V4L2_EVENT_EOS 2
+#define V4L2_EVENT_CTRL 3
#define V4L2_EVENT_PRIVATE_START 0x08000000
/* Payload for V4L2_EVENT_VSYNC */
@@ -1799,21 +1800,45 @@ struct v4l2_event_vsync {
__u8 field;
} __attribute__ ((packed));
+/* Payload for V4L2_EVENT_CTRL */
+#define V4L2_EVENT_CTRL_CH_VALUE (1 << 0)
+#define V4L2_EVENT_CTRL_CH_FLAGS (1 << 1)
+
+struct v4l2_event_ctrl {
+ __u32 changes;
+ __u32 type;
+ union {
+ __s32 value;
+ __s64 value64;
+ };
+ __u32 flags;
+ __s32 minimum;
+ __s32 maximum;
+ __s32 step;
+ __s32 default_value;
+};
+
struct v4l2_event {
__u32 type;
union {
struct v4l2_event_vsync vsync;
+ struct v4l2_event_ctrl ctrl;
__u8 data[64];
} u;
__u32 pending;
__u32 sequence;
struct timespec timestamp;
- __u32 reserved[9];
+ __u32 id;
+ __u32 reserved[8];
};
+#define V4L2_EVENT_SUB_FL_SEND_INITIAL (1 << 0)
+
struct v4l2_event_subscription {
__u32 type;
- __u32 reserved[7];
+ __u32 id;
+ __u32 flags;
+ __u32 reserved[5];
};
/*
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index e720f11a56f..c45bf40e080 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -28,9 +28,10 @@
/* forward references */
struct v4l2_ctrl_handler;
struct v4l2_ctrl;
-struct v4l2_fh;
struct video_device;
struct v4l2_subdev;
+struct v4l2_event_subscription;
+struct v4l2_fh;
/** 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
@@ -107,6 +108,7 @@ struct v4l2_ctrl_ops {
struct v4l2_ctrl {
/* Administrative fields */
struct list_head node;
+ struct list_head fhs;
struct v4l2_ctrl_handler *handler;
struct v4l2_ctrl **cluster;
unsigned ncontrols;
@@ -180,6 +182,11 @@ struct v4l2_ctrl_handler {
int error;
};
+struct v4l2_ctrl_fh {
+ struct list_head node;
+ struct v4l2_fh *fh;
+};
+
/** struct v4l2_ctrl_config - Control configuration structure.
* @ops: The control ops.
* @id: The control ID.
@@ -425,9 +432,9 @@ struct v4l2_ctrl *v4l2_ctrl_find(struct v4l2_ctrl_handler *hdl, u32 id);
* This sets or clears the V4L2_CTRL_FLAG_INACTIVE flag atomically.
* Does nothing if @ctrl == NULL.
* This will usually be called from within the s_ctrl op.
+ * The V4L2_EVENT_CTRL event will be generated afterwards.
*
- * This function can be called regardless of whether the control handler
- * is locked or not.
+ * This function assumes that the control handler is locked.
*/
void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
@@ -437,11 +444,12 @@ void v4l2_ctrl_activate(struct v4l2_ctrl *ctrl, bool active);
*
* This sets or clears the V4L2_CTRL_FLAG_GRABBED flag atomically.
* Does nothing if @ctrl == NULL.
+ * The V4L2_EVENT_CTRL event will be generated afterwards.
* This will usually be called when starting or stopping streaming in the
* driver.
*
- * This function can be called regardless of whether the control handler
- * is locked or not.
+ * This function assumes that the control handler is not locked and will
+ * take the lock itself.
*/
void v4l2_ctrl_grab(struct v4l2_ctrl *ctrl, bool grabbed);
@@ -486,6 +494,11 @@ s32 v4l2_ctrl_g_ctrl(struct v4l2_ctrl *ctrl);
*/
int v4l2_ctrl_s_ctrl(struct v4l2_ctrl *ctrl, s32 val);
+void v4l2_ctrl_add_fh(struct v4l2_ctrl_handler *hdl,
+ struct v4l2_ctrl_fh *ctrl_fh,
+ struct v4l2_event_subscription *sub);
+void v4l2_ctrl_del_fh(struct v4l2_ctrl *ctrl, struct v4l2_fh *fh);
+
/* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);
diff --git a/include/media/v4l2-event.h b/include/media/v4l2-event.h
index 3b86177c8cd..45e9c1e0551 100644
--- a/include/media/v4l2-event.h
+++ b/include/media/v4l2-event.h
@@ -40,6 +40,7 @@ struct v4l2_kevent {
struct v4l2_subscribed_event {
struct list_head list;
u32 type;
+ u32 id;
};
struct v4l2_events {
@@ -58,6 +59,7 @@ void v4l2_event_free(struct v4l2_fh *fh);
int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
int nonblocking);
void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
+void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev);
int v4l2_event_pending(struct v4l2_fh *fh);
int v4l2_event_subscribe(struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);