diff options
Diffstat (limited to 'Documentation/dvb/udev.txt')
-rw-r--r-- | Documentation/dvb/udev.txt | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Documentation/dvb/udev.txt b/Documentation/dvb/udev.txt new file mode 100644 index 000000000000..68ee224b6aae --- /dev/null +++ b/Documentation/dvb/udev.txt | |||
@@ -0,0 +1,46 @@ | |||
1 | The DVB subsystem currently registers to the sysfs subsystem using the | ||
2 | "class_simple" interface. | ||
3 | |||
4 | This means that only the basic informations like module loading parameters | ||
5 | are presented through sysfs. Other things that might be interesting are | ||
6 | currently *not* available. | ||
7 | |||
8 | Nevertheless it's now possible to add proper udev rules so that the | ||
9 | DVB device nodes are created automatically. | ||
10 | |||
11 | We assume that you have udev already up and running and that have been | ||
12 | creating the DVB device nodes manually up to now due to the missing sysfs | ||
13 | support. | ||
14 | |||
15 | 0. Don't forget to disable your current method of creating the | ||
16 | device nodes manually. | ||
17 | |||
18 | 1. Unfortunately, you'll need a helper script to transform the kernel | ||
19 | sysfs device name into the well known dvb adapter / device naming scheme. | ||
20 | The script should be called "dvb.sh" and should be placed into a script | ||
21 | dir where udev can execute it, most likely /etc/udev/scripts/ | ||
22 | |||
23 | So, create a new file /etc/udev/scripts/dvb.sh and add the following: | ||
24 | ------------------------------schnipp------------------------------------------------ | ||
25 | #!/bin/sh | ||
26 | /bin/echo $1 | /bin/sed -e 's,dvb\([0-9]\)\.\([^0-9]*\)\([0-9]\),dvb/adapter\1/\2\3,' | ||
27 | ------------------------------schnipp------------------------------------------------ | ||
28 | |||
29 | Don't forget to make the script executable with "chmod". | ||
30 | |||
31 | 1. You need to create a proper udev rule that will create the device nodes | ||
32 | like you know them. All real distributions out there scan the /etc/udev/rules.d | ||
33 | directory for rule files. The main udev configuration file /etc/udev/udev.conf | ||
34 | will tell you the directory where the rules are, most likely it's /etc/udev/rules.d/ | ||
35 | |||
36 | Create a new rule file in that directory called "dvb.rule" and add the following line: | ||
37 | ------------------------------schnipp------------------------------------------------ | ||
38 | KERNEL="dvb*", PROGRAM="/etc/udev/scripts/dvb.sh %k", NAME="%c" | ||
39 | ------------------------------schnipp------------------------------------------------ | ||
40 | |||
41 | If you want more control over the device nodes (for example a special group membership) | ||
42 | have a look at "man udev". | ||
43 | |||
44 | For every device that registers to the sysfs subsystem with a "dvb" prefix, | ||
45 | the helper script /etc/udev/scripts/dvb.sh is invoked, which will then | ||
46 | create the proper device node in your /dev/ directory. | ||