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authorHans Verkuil <hverkuil@xs4all.nl>2009-02-14 11:54:23 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-03-30 12:42:50 -0300
commit3a63e4492fbc7aa7f99d4368822da1382ec6fe03 (patch)
treed9d50f32757e7acde5f7ce3ecb22866b1cf51023 /Documentation/video4linux
parent62cfdacc9431cad7f9093e91b17ea68d684188ae (diff)
V4L/DVB (10643): v4l2-device: allow a NULL parent device when registering.
Some drivers (e.g. for ISA devices) have no parent device because there is no associated bus driver. Allow the parent device to be NULL in those cases when registering v4l2_device. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/video4linux')
-rw-r--r--Documentation/video4linux/v4l2-framework.txt10
1 files changed, 6 insertions, 4 deletions
diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index 48cdf86248c..e1620e2a38f 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -84,12 +84,14 @@ You must register the device instance:
v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev);
Registration will initialize the v4l2_device struct and link dev->driver_data
-to v4l2_dev. Registration will also set v4l2_dev->name to a value derived from
-dev (driver name followed by the bus_id, to be precise). You may change the
-name after registration if you want.
+to v4l2_dev. If v4l2_dev->name is empty then it will be set to a value derived
+from dev (driver name followed by the bus_id, to be precise). If you set it
+up before calling v4l2_device_register then it will be untouched. If dev is
+NULL, then you *must* setup v4l2_dev->name before calling v4l2_device_register.
The first 'dev' argument is normally the struct device pointer of a pci_dev,
-usb_device or platform_device.
+usb_device or platform_device. It is rare for dev to be NULL, but it happens
+with ISA devices, for example.
You unregister with: