From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- Documentation/dvb/udev.txt | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Documentation/dvb/udev.txt (limited to 'Documentation/dvb/udev.txt') diff --git a/Documentation/dvb/udev.txt b/Documentation/dvb/udev.txt new file mode 100644 index 00000000..412305b7 --- /dev/null +++ b/Documentation/dvb/udev.txt @@ -0,0 +1,46 @@ +The DVB subsystem currently registers to the sysfs subsystem using the +"class_simple" interface. + +This means that only the basic information like module loading parameters +are presented through sysfs. Other things that might be interesting are +currently *not* available. + +Nevertheless it's now possible to add proper udev rules so that the +DVB device nodes are created automatically. + +We assume that you have udev already up and running and that have been +creating the DVB device nodes manually up to now due to the missing sysfs +support. + +0. Don't forget to disable your current method of creating the +device nodes manually. + +1. Unfortunately, you'll need a helper script to transform the kernel +sysfs device name into the well known dvb adapter / device naming scheme. +The script should be called "dvb.sh" and should be placed into a script +dir where udev can execute it, most likely /etc/udev/scripts/ + +So, create a new file /etc/udev/scripts/dvb.sh and add the following: +------------------------------schnipp------------------------------------------------ +#!/bin/sh +/bin/echo $1 | /bin/sed -e 's,dvb\([0-9]\)\.\([^0-9]*\)\([0-9]\),dvb/adapter\1/\2\3,' +------------------------------schnipp------------------------------------------------ + +Don't forget to make the script executable with "chmod". + +1. You need to create a proper udev rule that will create the device nodes +like you know them. All real distributions out there scan the /etc/udev/rules.d +directory for rule files. The main udev configuration file /etc/udev/udev.conf +will tell you the directory where the rules are, most likely it's /etc/udev/rules.d/ + +Create a new rule file in that directory called "dvb.rule" and add the following line: +------------------------------schnipp------------------------------------------------ +KERNEL="dvb*", PROGRAM="/etc/udev/scripts/dvb.sh %k", NAME="%c" +------------------------------schnipp------------------------------------------------ + +If you want more control over the device nodes (for example a special group membership) +have a look at "man udev". + +For every device that registers to the sysfs subsystem with a "dvb" prefix, +the helper script /etc/udev/scripts/dvb.sh is invoked, which will then +create the proper device node in your /dev/ directory. -- cgit v1.2.3