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V4L/DVB: v4l: Add a v4l2_subdev host private data field

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The existing priv field stores subdev private data owned by the subdev
driver. Host (bridge) drivers might need to store per-subdev
host-specific data, such as a pointer to platform data.

Add a v4l2_subdev host_priv field to store host-specific data, and
rename the existing priv field to dev_priv.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart 2010-07-30 17:24:55 -03:00 committed by Mauro Carvalho Chehab
parent c4ce6d14b9
commit 692d552264
2 changed files with 21 additions and 4 deletions
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5
Documentation/video4linux/v4l2-framework.txt
View File

@ -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.

20
include/media/v4l2-subdev.h
View File

@ -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