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V4L/DVB (12541): v4l: remove video_register_device_index

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video_register_device_index is never actually called, instead the
stream index number is always calculated automatically.

This patch removes this function and simplifies the internal get_index
function since that can now always just return the first free index.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil
2009-06-19 11:32:56 -03:00
committed by Mauro Carvalho Chehab
parent 53dacb1570
commit 7ae0cd9bc7
3 changed files with 20 additions and 54 deletions
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17
Documentation/video4linux/v4l2-framework.txt
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@@ -500,17 +500,11 @@ first free number.
Whenever a device node is created some attributes are also created for you.
If you look in /sys/class/video4linux you see the devices. Go into e.g.
video0 and you will see 'name' and 'index' attributes. The 'name' attribute
is the 'name' field of the video_device struct. The 'index' attribute is
a device node index that can be assigned by the driver, or that is calculated
for you.
is the 'name' field of the video_device struct.
If you call video_register_device(), then the index is just increased by
1 for each device node you register. The first video device node you register
always starts off with 0.
Alternatively you can call video_register_device_index() which is identical
to video_register_device(), but with an extra index argument. Here you can
pass a specific index value (between 0 and 31) that should be used.
The 'index' attribute is the index of the device node: for each call to
video_register_device() the index is just increased by 1. The first video
device node you register always starts with index 0.
Users can setup udev rules that utilize the index attribute to make fancy
device names (e.g. 'mpegX' for MPEG video capture device nodes).
@@ -520,8 +514,7 @@ After the device was successfully registered, then you can use these fields:
- vfl_type: the device type passed to video_register_device.
- minor: the assigned device minor number.
- num: the device kernel number (i.e. the X in videoX).
- index: the device index number (calculated or set explicitly using
video_register_device_index).
- index: the device index number.
If the registration failed, then you need to call video_device_release()
to free the allocated video_device struct, or free your own struct if the