'\" t
.\"     Title: __register_chrdev
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: July 2017
.\"    Manual: Char devices
.\"    Source: Kernel Hackers Manual 4.11.6
.\"  Language: English
.\"
.TH "__REGISTER_CHRDEV" "9" "July 2017" "Kernel Hackers Manual 4\&.11\&" "Char devices"
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.SH "NAME"
__register_chrdev \- create and register a cdev occupying a range of minors
.SH "SYNOPSIS"
.HP \w'int\ __register_chrdev('u
.BI "int __register_chrdev(unsigned\ int\ " "major" ", unsigned\ int\ " "baseminor" ", unsigned\ int\ " "count" ", const\ char\ *\ " "name" ", const\ struct\ file_operations\ *\ " "fops" ");"
.SH "ARGUMENTS"
.PP
\fIunsigned int major\fR
.RS 4
major device number or 0 for dynamic allocation
.RE
.PP
\fIunsigned int baseminor\fR
.RS 4
first of the requested range of minor numbers
.RE
.PP
\fIunsigned int count\fR
.RS 4
the number of minor numbers required
.RE
.PP
\fIconst char * name\fR
.RS 4
name of this range of devices
.RE
.PP
\fIconst struct file_operations * fops\fR
.RS 4
file operations associated with this devices
.RE
.SH "DESCRIPTION"
.PP
If
\fImajor\fR
== 0 this functions will dynamically allocate a major and return its number\&.
.PP
If
\fImajor\fR
> 0 this function will attempt to reserve a device with the given major number and will return zero on success\&.
.PP
Returns a \-ve errno on failure\&.
.PP
The name of this device has nothing to do with the name of the device in /dev\&. It only helps to keep track of the different owners of devices\&. If your module name has only one type of devices it\*(Aqs ok to use e\&.g\&. the name of the module here\&.
.SH "COPYRIGHT"
.br