'\" t
.\"     Title: freq_reg_info
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Regulatory enforcement infrastructure
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "FREQ_REG_INFO" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Regulatory enforcement infrast"
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.SH "NAME"
freq_reg_info \- get regulatory information for the given frequency
.SH "SYNOPSIS"
.HP \w'const\ struct\ ieee80211_reg_rule\ *\ freq_reg_info('u
.BI "const struct ieee80211_reg_rule * freq_reg_info(struct\ wiphy\ *\ " "wiphy" ", u32\ " "center_freq" ");"
.SH "ARGUMENTS"
.PP
\fIwiphy\fR
.RS 4
the wiphy for which we want to process this rule for
.RE
.PP
\fIcenter_freq\fR
.RS 4
Frequency in KHz for which we want regulatory information for
.RE
.SH "DESCRIPTION"
.PP
Use this function to get the regulatory rule for a specific frequency on a given wireless device\&. If the device has a specific regulatory domain it wants to follow we respect that unless a country IE has been received and processed already\&.
.SH "RETURN"
.PP
A valid pointer, or, when an error occurs, for example if no rule can be found, the return value is encoded using
\fBERR_PTR\fR\&. Use
\fBIS_ERR\fR
to check and
\fBPTR_ERR\fR
to obtain the numeric return value\&. The numeric return value will be \-ERANGE if we determine the given center_freq does not even have a regulatory rule for a frequency range in the center_freq\*(Aqs band\&. See
\fBfreq_in_rule_band\fR
for our current definition of a band \-\- this is purely subjective and right now it\*(Aqs 802\&.11 specific\&.
.SH "AUTHOR"
.PP
\fBJohannes Berg\fR <\&johannes@sipsolutions.net\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br