/* ZD1211 USB-WLAN driver for Linux
*
* Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
* Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* In the long term, we'll probably find a better way of handling regulatory
* requirements outside of the driver.
*/
#include <linux/kernel.h>
#include <net/mac80211.h>
#include "zd_ieee80211.h"
#include "zd_mac.h"
struct channel_range {
u8 regdomain;
u8 start;
u8 end; /* exclusive (channel must be less than end) */
};
static const struct channel_range channel_ranges[] = {
{ ZD_REGDOMAIN_FCC, 1, 12 },
{ ZD_REGDOMAIN_IC, 1, 12 },
{ ZD_REGDOMAIN_ETSI, 1, 14 },
{ ZD_REGDOMAIN_JAPAN, 1, 14 },
{ ZD_REGDOMAIN_SPAIN, 1, 14 },
{ ZD_REGDOMAIN_FRANCE, 1, 14 },
/* Japan originally only had channel 14 available (see CHNL_ID 0x40 in
* 802.11). However, in 2001 the range was extended to include channels
* 1-13. The ZyDAS devices still use the old region code but are
* designed to allow the extra channel access in Japan. */
{ ZD_REGDOMAIN_JAPAN_ADD, 1, 15 },
};
static const struct channel_range *zd_channel_range(u8 regdomain)
{
int i;
for (i = 0; i < ARRAY_SIZE(channel_ranges); i++) {
const struct channel_range *range = &channel_ranges[i];
if (range->regdomain == regdomain)
return range;
}
return NULL;
}
#define CHAN_TO_IDX(chan) ((chan) - 1)
static void unmask_bg_channels(struct ieee80211_hw *hw,
const struct channel_range *range,
struct ieee80211_supported_band *sband)
{
u8 channel;
for (channel = range->start; channel < range->end; channel++) {
struct ieee80211_channel *chan =
&sband->channels[CHAN_TO_IDX(channel)];
chan->flags = 0;
}
}
void zd_geo_init(struct ieee80211_hw *hw, u8 regdomain)
{
struct zd_mac *mac = zd_hw_mac(hw);
const struct channel_range *range;
dev_dbg(zd_mac_dev(mac), "regdomain %#02x\n", regdomain);
range = zd_channel_range(regdomain);
if (!range) {
/* The vendor driver overrides the regulatory domain and
* allowed channel registers and unconditionally restricts
* available channels to 1-11 everywhere. Match their
* questionable behaviour only for regdomains which we don't
* recognise. */
dev_warn(zd_mac_dev(mac), "Unrecognised regulatory domain: "
"%#02x. Defaulting to FCC.\n", regdomain);
range = zd_channel_range(ZD_REGDOMAIN_FCC);
}
unmask_bg_channels(hw, range, &mac->band);
}
