centos man page for regulatory_hint

REGULATORY_HINT(9)					  Regulatory enforcement infrast					REGULATORY_HINT(9)

NAME
       regulatory_hint - driver hint to the wireless core a regulatory domain

SYNOPSIS
       int regulatory_hint(struct wiphy * wiphy, const char * alpha2);

ARGUMENTS
       wiphy
	   the wireless device giving the hint (used only for reporting conflicts)

       alpha2
	   the ISO/IEC 3166 alpha2 the driver claims its regulatory domain should be in. If rd is set this should be NULL. Note that if you set
	   this to NULL you should still set rd->alpha2 to some accepted alpha2.

DESCRIPTION
       Wireless drivers can use this function to hint to the wireless core what it believes should be the current regulatory domain by giving it
       an ISO/IEC 3166 alpha2 country code it knows its regulatory domain should be in or by providing a completely build regulatory domain. If
       the driver provides an ISO/IEC 3166 alpha2 userspace will be queried for a regulatory domain structure for the respective country.

       The wiphy must have been registered to cfg80211 prior to this call. For cfg80211 drivers this means you must first use wiphy_register, for
       mac80211 drivers you must first use ieee80211_register_hw.

       Drivers should check the return value, its possible you can get an -ENOMEM.

RETURN
       0 on success. -ENOMEM.

AUTHOR
       Johannes Berg <johannes@sipsolutions.net>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							REGULATORY_HINT(9)