mirror of https://gitee.com/openkylin/linux.git
64 lines
2.4 KiB
ReStructuredText
64 lines
2.4 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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UDEV rules for DVB
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==================
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.. note::
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#) This documentation is outdated. Udev on modern distributions auto-detect
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the DVB devices.
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#) **TODO:** change this document to explain how to make DVB devices
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persistent, as, when a machine has multiple devices, they may be detected
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on different orders, which could cause apps that relies on the device
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numbers to fail.
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The DVB subsystem currently registers to the sysfs subsystem using the
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"class_simple" interface.
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This means that only the basic information like module loading parameters
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are presented through sysfs. Other things that might be interesting are
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currently **not** available.
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Nevertheless it's now possible to add proper udev rules so that the
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DVB device nodes are created automatically.
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We assume that you have udev already up and running and that have been
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creating the DVB device nodes manually up to now due to the missing sysfs
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support.
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0. Don't forget to disable your current method of creating the
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device nodes manually.
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1. Unfortunately, you'll need a helper script to transform the kernel
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sysfs device name into the well known dvb adapter / device naming scheme.
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The script should be called "dvb.sh" and should be placed into a script
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dir where udev can execute it, most likely /etc/udev/scripts/
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So, create a new file /etc/udev/scripts/dvb.sh and add the following:
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.. code-block:: none
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#!/bin/sh
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/bin/echo $1 | /bin/sed -e 's,dvb\([0-9]\)\.\([^0-9]*\)\([0-9]\),dvb/adapter\1/\2\3,'
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Don't forget to make the script executable with "chmod".
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1. You need to create a proper udev rule that will create the device nodes
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like you know them. All real distributions out there scan the /etc/udev/rules.d
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directory for rule files. The main udev configuration file /etc/udev/udev.conf
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will tell you the directory where the rules are, most likely it's /etc/udev/rules.d/
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Create a new rule file in that directory called "dvb.rule" and add the following line:
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.. code-block:: none
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KERNEL="dvb*", PROGRAM="/etc/udev/scripts/dvb.sh %k", NAME="%c"
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If you want more control over the device nodes (for example a special group membership)
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have a look at "man udev".
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For every device that registers to the sysfs subsystem with a "dvb" prefix,
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the helper script /etc/udev/scripts/dvb.sh is invoked, which will then
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create the proper device node in your /dev/ directory.
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