cfg80211: Add new wireless regulatory infrastructure

This adds the new wireless regulatory infrastructure. The
main motiviation behind this was to centralize regulatory
code as each driver was implementing their own regulatory solution,
and to replace the initial centralized code we have where:

* only 3 regulatory domains are supported: US, JP and EU
* regulatory domains can only be changed through module parameter
* all rules were built statically in the kernel

We now have support for regulatory domains for many countries
and regulatory domains are now queried through a userspace agent
through udev allowing distributions to update regulatory rules
without updating the kernel.

Each driver can regulatory_hint() a regulatory domain
based on either their EEPROM mapped regulatory domain value to a
respective ISO/IEC 3166-1 country code or pass an internally built
regulatory domain. We also add support to let the user set the
regulatory domain through userspace in case of faulty EEPROMs to
further help compliance.

Support for world roaming will be added soon for cards capable of
this.

For more information see:

http://wireless.kernel.org/en/developers/Regulatory/CRDA

For now we leave an option to enable the old module parameter,
ieee80211_regdom, and to build the 3 old regdomains statically
(US, JP and EU). This option is CONFIG_WIRELESS_OLD_REGULATORY.
These old static definitions and the module parameter is being
scheduled for removal for 2.6.29. Note that if you use this
you won't make use of a world regulatory domain as its pointless.
If you leave this option enabled and if CRDA is present and you
use US or JP we will try to ask CRDA to update us a regulatory
domain for us.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/net/wireless/Kconfig b/net/wireless/Kconfig
index 833b024f8f66..b97bd9fe6b79 100644
--- a/net/wireless/Kconfig
+++ b/net/wireless/Kconfig
@@ -14,6 +14,38 @@ config NL80211
 
 	  If unsure, say Y.
 
+config WIRELESS_OLD_REGULATORY
+	bool "Old wireless static regulatory defintions"
+	default n
+	---help---
+	  This option enables the old static regulatory information
+	  and uses it within the new framework. This is available
+	  temporarily as an option to help prevent immediate issues
+	  due to the switch to the new regulatory framework which
+	  does require a new userspace application which has the
+	  database of regulatory information (CRDA) and another for
+	  setting regulatory domains (iw).
+
+	  For more information see:
+
+	  http://wireless.kernel.org/en/developers/Regulatory/CRDA
+	  http://wireless.kernel.org/en/users/Documentation/iw
+
+	  It is important to note though that if you *do* have CRDA present
+	  and if this option is enabled CRDA *will* be called to update the
+	  regulatory domain (for US and JP only). Support for letting the user
+	  set the regulatory domain through iw is also supported. This option
+	  mainly exists to leave around for a kernel release some old static
+	  regulatory domains that were defined and to keep around the old
+	  ieee80211_regdom module parameter. This is being phased out and you
+	  should stop using them ASAP.
+
+	  Say N unless you cannot install a new userspace application
+	  or have one currently depending on the ieee80211_regdom module
+	  parameter and cannot port it to use the new userspace interfaces.
+
+	  This is scheduled for removal for 2.6.29.
+
 config WIRELESS_EXT
 	bool "Wireless extensions"
 	default n