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-rw-r--r--Documentation/video4linux/v4l2-framework.txt5
-rw-r--r--include/media/v4l2-subdev.h20
2 files changed, 21 insertions, 4 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index e831aaca66f8..f5fdb395287f 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -192,6 +192,11 @@ You also need a way to go from the low-level struct to v4l2_subdev. For the
common i2c_client struct the i2c_set_clientdata() call is used to store a
v4l2_subdev pointer, for other busses you may have to use other methods.
+Bridges might also need to store per-subdev private data, such as a pointer to
+bridge-specific per-subdev private data. The v4l2_subdev structure provides
+host private data for that purpose that can be accessed with
+v4l2_get_subdev_hostdata() and v4l2_set_subdev_hostdata().
+
From the bridge driver perspective you load the sub-device module and somehow
obtain the v4l2_subdev pointer. For i2c devices this is easy: you call
i2c_get_clientdata(). For other busses something similar needs to be done.
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 905879d7742f..b0316a7cf08d 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -438,17 +438,28 @@ struct v4l2_subdev {
/* can be used to group similar subdevs, value is driver-specific */
u32 grp_id;
/* pointer to private data */
- void *priv;
+ void *dev_priv;
+ void *host_priv;
};
static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
{
- sd->priv = p;
+ sd->dev_priv = p;
}
static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
{
- return sd->priv;
+ return sd->dev_priv;
+}
+
+static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
+{
+ sd->host_priv = p;
+}
+
+static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
+{
+ return sd->host_priv;
}
static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
@@ -462,7 +473,8 @@ static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
sd->flags = 0;
sd->name[0] = '\0';
sd->grp_id = 0;
- sd->priv = NULL;
+ sd->dev_priv = NULL;
+ sd->host_priv = NULL;
}
/* Call an ops of a v4l2_subdev, doing the right checks against