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From dd0b366441249eb10daa2275e968431507f8d0d5 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Wed, 9 Dec 2009 12:39:54 +0100
Subject: [PATCH 06/43] v4l: subdev: Control ioctls support
Pass the control-related ioctls to the subdev driver through the control
framework.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
Documentation/video4linux/v4l2-framework.txt | 16 ++++++++++++++++
drivers/media/video/v4l2-subdev.c | 25 +++++++++++++++++++++++++
2 files changed, 41 insertions(+), 0 deletions(-)
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 4c9185a..f683f63 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -336,6 +336,22 @@ argument to 0. Setting the argument to 1 will only enable device node
registration if the sub-device driver has set the V4L2_SUBDEV_FL_HAS_DEVNODE
flag.
+The device node handles a subset of the V4L2 API.
+
+VIDIOC_QUERYCTRL
+VIDIOC_QUERYMENU
+VIDIOC_G_CTRL
+VIDIOC_S_CTRL
+VIDIOC_G_EXT_CTRLS
+VIDIOC_S_EXT_CTRLS
+VIDIOC_TRY_EXT_CTRLS
+
+ The controls ioctls are identical to the ones defined in V4L2. They
+ behave identically, with the only exception that they deal only with
+ controls implemented in the sub-device. Depending on the driver, those
+ controls can be also be accessed through one (or several) V4L2 device
+ nodes.
+
I2C sub-device drivers
----------------------
diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
index 0deff78..fc57ce7 100644
--- a/drivers/media/video/v4l2-subdev.c
+++ b/drivers/media/video/v4l2-subdev.c
@@ -24,6 +24,7 @@
#include <linux/ioctl.h>
#include <linux/videodev2.h>
+#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
@@ -45,7 +46,31 @@ static int subdev_close(struct file *file)
static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
{
+ struct video_device *vdev = video_devdata(file);
+ struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+
switch (cmd) {
+ case VIDIOC_QUERYCTRL:
+ return v4l2_subdev_queryctrl(sd, arg);
+
+ case VIDIOC_QUERYMENU:
+ return v4l2_subdev_querymenu(sd, arg);
+
+ case VIDIOC_G_CTRL:
+ return v4l2_subdev_g_ctrl(sd, arg);
+
+ case VIDIOC_S_CTRL:
+ return v4l2_subdev_s_ctrl(sd, arg);
+
+ case VIDIOC_G_EXT_CTRLS:
+ return v4l2_subdev_g_ext_ctrls(sd, arg);
+
+ case VIDIOC_S_EXT_CTRLS:
+ return v4l2_subdev_s_ext_ctrls(sd, arg);
+
+ case VIDIOC_TRY_EXT_CTRLS:
+ return v4l2_subdev_try_ext_ctrls(sd, arg);
+
default:
return -ENOIOCTLCMD;
}
--
1.6.6.1
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