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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2010-07-30 17:24:55 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2010-10-21 01:04:52 -0200
commit692d5522646fdf432329efbe5092dc9c5ca83e85 (patch)
treeb68da8aa39f3acd1098ed6c7129e6ccebcf44cb0 /Documentation/video4linux/v4l2-framework.txt
parentc4ce6d14b92aa1772c9d84d068d1b45114fe73cc (diff)
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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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-rw-r--r--Documentation/video4linux/v4l2-framework.txt5
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diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index e831aac..f5fdb39 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.
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