path: root/Documentation/video4linux
diff options
authorHans Verkuil <>2013-05-29 07:59:57 -0300
committerMauro Carvalho Chehab <>2013-06-17 09:18:29 -0300
commit2249aa5c97a017be4e3b5bb0e9a3ca2d2ed31b27 (patch)
tree4e5449abaf34ece02dee15a52ca789c6f64da63f /Documentation/video4linux
parentabbec2d401d6698db44e632f5adbef2a47e6e812 (diff)
[media] v4l2-framework: replace g_chip_ident by g_std in the examples
The framework documentation used the g_chip_ident op as an example. This op has been removed, so replace its use in the examples by the g_std op. Signed-off-by: Hans Verkuil <> Cc: Mauro Carvalho Chehab <> Signed-off-by: Mauro Carvalho Chehab <>
Diffstat (limited to 'Documentation/video4linux')
1 files changed, 6 insertions, 7 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index a300b283a1a0..24353ecab197 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -246,7 +246,6 @@ may be NULL if the subdev driver does not support anything from that category.
It looks like this:
struct v4l2_subdev_core_ops {
- int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip);
int (*log_status)(struct v4l2_subdev *sd);
int (*init)(struct v4l2_subdev *sd, u32 val);
@@ -346,24 +345,24 @@ Afterwards the subdev module can be unloaded and sd->dev == NULL.
You can call an ops function either directly:
- err = sd->ops->core->g_chip_ident(sd, &chip);
+ err = sd->ops->core->g_std(sd, &norm);
but it is better and easier to use this macro:
- err = v4l2_subdev_call(sd, core, g_chip_ident, &chip);
+ err = v4l2_subdev_call(sd, core, g_std, &norm);
The macro will to the right NULL pointer checks and returns -ENODEV if subdev
-is NULL, -ENOIOCTLCMD if either subdev->core or subdev->core->g_chip_ident is
-NULL, or the actual result of the subdev->ops->core->g_chip_ident ops.
+is NULL, -ENOIOCTLCMD if either subdev->core or subdev->core->g_std is
+NULL, or the actual result of the subdev->ops->core->g_std ops.
It is also possible to call all or a subset of the sub-devices:
- v4l2_device_call_all(v4l2_dev, 0, core, g_chip_ident, &chip);
+ v4l2_device_call_all(v4l2_dev, 0, core, g_std, &norm);
Any subdev that does not support this ops is skipped and error results are
ignored. If you want to check for errors use this:
- err = v4l2_device_call_until_err(v4l2_dev, 0, core, g_chip_ident, &chip);
+ err = v4l2_device_call_until_err(v4l2_dev, 0, core, g_std, &norm);
Any error except -ENOIOCTLCMD will exit the loop with that error. If no
errors (except -ENOIOCTLCMD) occurred, then 0 is returned.