mirror of https://gitee.com/openkylin/linux.git
104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/* ZD1211 USB-WLAN driver for Linux
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*
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* Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
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* Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* In the long term, we'll probably find a better way of handling regulatory
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* requirements outside of the driver.
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*/
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#include <linux/kernel.h>
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#include <net/mac80211.h>
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#include "zd_ieee80211.h"
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#include "zd_mac.h"
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struct channel_range {
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u8 regdomain;
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u8 start;
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u8 end; /* exclusive (channel must be less than end) */
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};
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static const struct channel_range channel_ranges[] = {
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{ ZD_REGDOMAIN_FCC, 1, 12 },
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{ ZD_REGDOMAIN_IC, 1, 12 },
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{ ZD_REGDOMAIN_ETSI, 1, 14 },
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{ ZD_REGDOMAIN_JAPAN, 1, 14 },
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{ ZD_REGDOMAIN_SPAIN, 1, 14 },
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{ ZD_REGDOMAIN_FRANCE, 1, 14 },
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/* Japan originally only had channel 14 available (see CHNL_ID 0x40 in
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* 802.11). However, in 2001 the range was extended to include channels
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* 1-13. The ZyDAS devices still use the old region code but are
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* designed to allow the extra channel access in Japan. */
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{ ZD_REGDOMAIN_JAPAN_ADD, 1, 15 },
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};
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static const struct channel_range *zd_channel_range(u8 regdomain)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(channel_ranges); i++) {
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const struct channel_range *range = &channel_ranges[i];
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if (range->regdomain == regdomain)
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return range;
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}
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return NULL;
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}
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#define CHAN_TO_IDX(chan) ((chan) - 1)
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static void unmask_bg_channels(struct ieee80211_hw *hw,
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const struct channel_range *range,
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struct ieee80211_hw_mode *mode)
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{
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u8 channel;
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for (channel = range->start; channel < range->end; channel++) {
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struct ieee80211_channel *chan =
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&mode->channels[CHAN_TO_IDX(channel)];
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chan->flag |= IEEE80211_CHAN_W_SCAN |
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IEEE80211_CHAN_W_ACTIVE_SCAN |
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IEEE80211_CHAN_W_IBSS;
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}
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}
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void zd_geo_init(struct ieee80211_hw *hw, u8 regdomain)
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{
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struct zd_mac *mac = zd_hw_mac(hw);
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const struct channel_range *range;
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dev_dbg(zd_mac_dev(mac), "regdomain %#02x\n", regdomain);
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range = zd_channel_range(regdomain);
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if (!range) {
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/* The vendor driver overrides the regulatory domain and
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* allowed channel registers and unconditionally restricts
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* available channels to 1-11 everywhere. Match their
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* questionable behaviour only for regdomains which we don't
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* recognise. */
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dev_warn(zd_mac_dev(mac), "Unrecognised regulatory domain: "
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"%#02x. Defaulting to FCC.\n", regdomain);
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range = zd_channel_range(ZD_REGDOMAIN_FCC);
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}
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unmask_bg_channels(hw, range, &mac->modes[0]);
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unmask_bg_channels(hw, range, &mac->modes[1]);
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}
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