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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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+ *
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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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+/*
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+ * This regulatory domain control implementation is known to be incomplete
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+ * and confusing. mac80211 regulatory domain control will be significantly
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+ * reworked in the not-too-distant future.
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+ *
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+ * For now, drivers wishing to control which channels are and aren't available
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+ * are advised as follows:
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+ * - set the IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED flag
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+ * - continue to include *ALL* possible channels in the modes registered
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+ * through ieee80211_register_hwmode()
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+ * - for each allowable ieee80211_channel structure registered in the above
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+ * call, set the flag member to some meaningful value such as
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+ * IEEE80211_CHAN_W_SCAN | IEEE80211_CHAN_W_ACTIVE_SCAN |
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+ * IEEE80211_CHAN_W_IBSS.
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+ * - leave flag as 0 for non-allowable channels
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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, then performing
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+ * the above.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/netdevice.h>
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+#include <net/mac80211.h>
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+
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+static int ieee80211_regdom = 0x10; /* FCC */
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+module_param(ieee80211_regdom, int, 0444);
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+MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain; 64=MKK");
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+
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+/*
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+ * If firmware is upgraded by the vendor, additional channels can be used based
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+ * on the new Japanese regulatory rules. This is indicated by setting
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+ * ieee80211_japan_5ghz module parameter to one when loading the 80211 kernel
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+ * module.
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+ */
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+static int ieee80211_japan_5ghz /* = 0 */;
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+module_param(ieee80211_japan_5ghz, int, 0444);
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+MODULE_PARM_DESC(ieee80211_japan_5ghz, "Vendor-updated firmware for 5 GHz");
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+
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+
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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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+ unsigned char power_level;
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+ unsigned char antenna_max;
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+};
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+
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+static const struct ieee80211_channel_range ieee80211_fcc_channels[] = {
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+ { 2412, 2462, 27, 6 } /* IEEE 802.11b/g, channels 1..11 */,
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+ { 5180, 5240, 17, 6 } /* IEEE 802.11a, channels 36..48 */,
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+ { 5260, 5320, 23, 6 } /* IEEE 802.11a, channels 52..64 */,
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+ { 5745, 5825, 30, 6 } /* IEEE 802.11a, channels 149..165, outdoor */,
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+ { 0 }
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+};
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+
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+static const struct ieee80211_channel_range ieee80211_mkk_channels[] = {
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+ { 2412, 2472, 20, 6 } /* IEEE 802.11b/g, channels 1..13 */,
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+ { 5170, 5240, 20, 6 } /* IEEE 802.11a, channels 34..48 */,
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+ { 5260, 5320, 20, 6 } /* IEEE 802.11a, channels 52..64 */,
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+ { 0 }
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+};
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+
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+
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+static const struct ieee80211_channel_range *channel_range =
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+ ieee80211_fcc_channels;
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+
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+
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+static void ieee80211_unmask_channel(int mode, struct ieee80211_channel *chan)
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+{
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+ int i;
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+
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+ chan->flag = 0;
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+
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+ if (ieee80211_regdom == 64 &&
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+ (mode == MODE_ATHEROS_TURBO || mode == MODE_ATHEROS_TURBOG)) {
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+ /* Do not allow Turbo modes in Japan. */
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+ return;
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+ }
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+
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+ for (i = 0; channel_range[i].start_freq; i++) {
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+ const struct ieee80211_channel_range *r = &channel_range[i];
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+ if (r->start_freq <= chan->freq && r->end_freq >= chan->freq) {
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+ if (ieee80211_regdom == 64 && !ieee80211_japan_5ghz &&
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+ chan->freq >= 5260 && chan->freq <= 5320) {
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+ /*
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+ * Skip new channels in Japan since the
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+ * firmware was not marked having been upgraded
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+ * by the vendor.
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+ */
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+ continue;
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+ }
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+
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+ if (ieee80211_regdom == 0x10 &&
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+ (chan->freq == 5190 || chan->freq == 5210 ||
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+ chan->freq == 5230)) {
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+ /* Skip MKK channels when in FCC domain. */
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+ continue;
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+ }
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+
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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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+ chan->power_level = r->power_level;
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+ chan->antenna_max = r->antenna_max;
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+
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+ if (ieee80211_regdom == 64 &&
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+ (chan->freq == 5170 || chan->freq == 5190 ||
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+ chan->freq == 5210 || chan->freq == 5230)) {
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+ /*
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+ * New regulatory rules in Japan have backwards
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+ * compatibility with old channels in 5.15-5.25
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+ * GHz band, but the station is not allowed to
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+ * use active scan on these old channels.
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+ */
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+ chan->flag &= ~IEEE80211_CHAN_W_ACTIVE_SCAN;
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+ }
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+
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+ if (ieee80211_regdom == 64 &&
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+ (chan->freq == 5260 || chan->freq == 5280 ||
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+ chan->freq == 5300 || chan->freq == 5320)) {
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+ /*
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+ * IBSS is not allowed on 5.25-5.35 GHz band
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+ * due to radar detection requirements.
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+ */
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+ chan->flag &= ~IEEE80211_CHAN_W_IBSS;
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+ }
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+
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+ break;
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+ }
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+ }
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+}
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+
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+
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+void ieee80211_set_default_regdomain(struct ieee80211_hw_mode *mode)
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+{
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+ int c;
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+ for (c = 0; c < mode->num_channels; c++)
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+ ieee80211_unmask_channel(mode->mode, &mode->channels[c]);
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+}
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+
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+
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+void ieee80211_regdomain_init(void)
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+{
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+ if (ieee80211_regdom == 0x40)
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+ channel_range = ieee80211_mkk_channels;
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+}
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+
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Daniel Drake