From 2249aa5c97a017be4e3b5bb0e9a3ca2d2ed31b27 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Wed, 29 May 2013 07:59:57 -0300 Subject: [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 --- Documentation/video4linux/v4l2-framework.txt | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) (limited to 'Documentation/video4linux/v4l2-framework.txt') 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. -- cgit v1.2.3