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/zh_CN/video4linux/v4l2-framework.txt | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) (limited to 'Documentation/zh_CN') diff --git a/Documentation/zh_CN/video4linux/v4l2-framework.txt b/Documentation/zh_CN/video4linux/v4l2-framework.txt index 44c1d934c4e..0da95dbaef3 100644 --- a/Documentation/zh_CN/video4linux/v4l2-framework.txt +++ b/Documentation/zh_CN/video4linux/v4l2-framework.txt @@ -247,7 +247,6 @@ i2c_client 结构体,i2c_set_clientdata() 函数可用于保存一个 v4l2_sub 这些结构体定义如下: 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); ... @@ -337,24 +336,24 @@ subdev->dev 域就指向了 v4l2_device。 注册之设备后,可通过以下方式直接调用其操作函数: - err = sd->ops->core->g_chip_ident(sd, &chip); + err = sd->ops->core->g_std(sd, &norm); 但使用如下宏会比较容易且合适: - err = v4l2_subdev_call(sd, core, g_chip_ident, &chip); + err = v4l2_subdev_call(sd, core, g_std, &norm); 这个宏将会做 NULL 指针检查,如果 subdev 为 NULL,则返回-ENODEV;如果 -subdev->core 或 subdev->core->g_chip_ident 为 NULL,则返回 -ENOIOCTLCMD; -否则将返回 subdev->ops->core->g_chip_ident ops 调用的实际结果。 +subdev->core 或 subdev->core->g_std 为 NULL,则返回 -ENOIOCTLCMD; +否则将返回 subdev->ops->core->g_std ops 调用的实际结果。 有时也可能同时调用所有或一系列子设备的某个操作函数: - v4l2_device_call_all(v4l2_dev, 0, core, g_chip_ident, &chip); + v4l2_device_call_all(v4l2_dev, 0, core, g_std, &norm); 任何不支持此操作的子设备都会被跳过,并忽略错误返回值。但如果你需要 检查出错码,则可使用如下函数: - 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); 除 -ENOIOCTLCMD 外的任何错误都会跳出循环并返回错误值。如果(除 -ENOIOCTLCMD 外)没有错误发生,则返回 0。 -- cgit v1.2.3-70-g09d2