2008-01-25 02:38:38 +08:00
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/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* This regulatory domain control implementation is highly incomplete, it
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* only exists for the purpose of not regressing mac80211.
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*
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* For now, drivers can restrict the set of allowed channels by either
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* not registering those channels or setting the IEEE80211_CHAN_DISABLED
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* flag; that flag will only be *set* by this code, never *cleared.
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*
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* The usual implementation is for a driver to read a device EEPROM to
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* determine which regulatory domain it should be operating under, then
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* looking up the allowable channels in a driver-local table and finally
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* registering those channels in the wiphy structure.
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*
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* Alternatively, drivers that trust the regulatory domain control here
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* will register a complete set of capabilities and the control code
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* will restrict the set by setting the IEEE80211_CHAN_* flags.
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*/
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#include <linux/kernel.h>
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#include <net/wireless.h>
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#include "core.h"
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static char *ieee80211_regdom = "US";
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module_param(ieee80211_regdom, charp, 0444);
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MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
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struct ieee80211_channel_range {
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short start_freq;
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short end_freq;
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int max_power;
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int max_antenna_gain;
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u32 flags;
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};
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struct ieee80211_regdomain {
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const char *code;
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const struct ieee80211_channel_range *ranges;
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int n_ranges;
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};
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#define RANGE_PWR(_start, _end, _pwr, _ag, _flags) \
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{ _start, _end, _pwr, _ag, _flags }
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/*
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* Ideally, in the future, these definitions will be loaded from a
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* userspace table via some daemon.
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*/
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static const struct ieee80211_channel_range ieee80211_US_channels[] = {
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/* IEEE 802.11b/g, channels 1..11 */
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RANGE_PWR(2412, 2462, 27, 6, 0),
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2008-02-14 02:58:34 +08:00
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/* IEEE 802.11a, channel 36*/
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RANGE_PWR(5180, 5180, 23, 6, 0),
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/* IEEE 802.11a, channel 40*/
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RANGE_PWR(5200, 5200, 23, 6, 0),
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/* IEEE 802.11a, channel 44*/
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RANGE_PWR(5220, 5220, 23, 6, 0),
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/* IEEE 802.11a, channels 48..64 */
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RANGE_PWR(5240, 5320, 23, 6, 0),
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2008-01-25 02:38:38 +08:00
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/* IEEE 802.11a, channels 149..165, outdoor */
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RANGE_PWR(5745, 5825, 30, 6, 0),
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};
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static const struct ieee80211_channel_range ieee80211_JP_channels[] = {
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/* IEEE 802.11b/g, channels 1..14 */
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RANGE_PWR(2412, 2484, 20, 6, 0),
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/* IEEE 802.11a, channels 34..48 */
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RANGE_PWR(5170, 5240, 20, 6, IEEE80211_CHAN_PASSIVE_SCAN),
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/* IEEE 802.11a, channels 52..64 */
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RANGE_PWR(5260, 5320, 20, 6, IEEE80211_CHAN_NO_IBSS |
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IEEE80211_CHAN_RADAR),
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};
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#define REGDOM(_code) \
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{ \
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.code = __stringify(_code), \
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.ranges = ieee80211_ ##_code## _channels, \
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.n_ranges = ARRAY_SIZE(ieee80211_ ##_code## _channels), \
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}
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static const struct ieee80211_regdomain ieee80211_regdoms[] = {
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REGDOM(US),
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REGDOM(JP),
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};
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static const struct ieee80211_regdomain *get_regdom(void)
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{
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static const struct ieee80211_channel_range
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ieee80211_world_channels[] = {
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/* IEEE 802.11b/g, channels 1..11 */
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RANGE_PWR(2412, 2462, 27, 6, 0),
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};
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static const struct ieee80211_regdomain regdom_world = REGDOM(world);
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int i;
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for (i = 0; i < ARRAY_SIZE(ieee80211_regdoms); i++)
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if (strcmp(ieee80211_regdom, ieee80211_regdoms[i].code) == 0)
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return &ieee80211_regdoms[i];
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return ®dom_world;
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}
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static void handle_channel(struct ieee80211_channel *chan,
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const struct ieee80211_regdomain *rd)
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{
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int i;
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u32 flags = chan->orig_flags;
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const struct ieee80211_channel_range *rg = NULL;
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for (i = 0; i < rd->n_ranges; i++) {
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if (rd->ranges[i].start_freq <= chan->center_freq &&
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chan->center_freq <= rd->ranges[i].end_freq) {
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rg = &rd->ranges[i];
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break;
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}
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}
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if (!rg) {
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/* not found */
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flags |= IEEE80211_CHAN_DISABLED;
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chan->flags = flags;
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return;
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}
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chan->flags = flags;
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chan->max_antenna_gain = min(chan->orig_mag,
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rg->max_antenna_gain);
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2008-04-04 03:32:54 +08:00
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if (chan->orig_mpwr)
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chan->max_power = min(chan->orig_mpwr, rg->max_power);
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else
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chan->max_power = rg->max_power;
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2008-01-25 02:38:38 +08:00
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}
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static void handle_band(struct ieee80211_supported_band *sband,
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const struct ieee80211_regdomain *rd)
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{
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int i;
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for (i = 0; i < sband->n_channels; i++)
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handle_channel(&sband->channels[i], rd);
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}
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void wiphy_update_regulatory(struct wiphy *wiphy)
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{
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enum ieee80211_band band;
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const struct ieee80211_regdomain *rd = get_regdom();
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for (band = 0; band < IEEE80211_NUM_BANDS; band++)
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if (wiphy->bands[band])
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handle_band(wiphy->bands[band], rd);
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}
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