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V4L/DVB: v4l: Add a v4l2_subdev host private data field
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>
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@ -192,6 +192,11 @@ You also need a way to go from the low-level struct to v4l2_subdev. For the
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common i2c_client struct the i2c_set_clientdata() call is used to store a
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v4l2_subdev pointer, for other busses you may have to use other methods.
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Bridges might also need to store per-subdev private data, such as a pointer to
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bridge-specific per-subdev private data. The v4l2_subdev structure provides
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host private data for that purpose that can be accessed with
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v4l2_get_subdev_hostdata() and v4l2_set_subdev_hostdata().
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From the bridge driver perspective you load the sub-device module and somehow
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obtain the v4l2_subdev pointer. For i2c devices this is easy: you call
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i2c_get_clientdata(). For other busses something similar needs to be done.
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@ -438,17 +438,28 @@ struct v4l2_subdev {
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/* can be used to group similar subdevs, value is driver-specific */
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u32 grp_id;
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/* pointer to private data */
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void *priv;
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void *dev_priv;
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void *host_priv;
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};
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static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
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{
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sd->priv = p;
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sd->dev_priv = p;
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}
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static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
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{
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return sd->priv;
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return sd->dev_priv;
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}
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static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
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{
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sd->host_priv = p;
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}
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static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
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{
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return sd->host_priv;
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}
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static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
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@ -462,7 +473,8 @@ static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
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sd->flags = 0;
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sd->name[0] = '\0';
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sd->grp_id = 0;
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sd->priv = NULL;
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sd->dev_priv = NULL;
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sd->host_priv = NULL;
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}
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/* Call an ops of a v4l2_subdev, doing the right checks against
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