1 files changed, 575 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/regd.c b/drivers/net/wireless/ath/regd.c
new file mode 100644
index 000000000000..eef370bd1211
--- /dev/null
+++ b/drivers/net/wireless/ath/regd.c
@@ -0,0 +1,575 @@
+/*
+ * Copyright (c) 2008-2009 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <net/cfg80211.h>
+#include <net/mac80211.h>
+#include "regd.h"
+#include "regd_common.h"
+
+/*
+ * This is a set of common rules used by our world regulatory domains.
+ * We have 12 world regulatory domains. To save space we consolidate
+ * the regulatory domains in 5 structures by frequency and change
+ * the flags on our reg_notifier() on a case by case basis.
+ */
+
+/* Only these channels all allow active scan on all world regulatory domains */
+#define ATH9K_2GHZ_CH01_11      REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
+
+/* We enable active scan on these a case by case basis by regulatory domain */
+#define ATH9K_2GHZ_CH12_13      REG_RULE(2467-10, 2472+10, 40, 0, 20,\
+                                        NL80211_RRF_PASSIVE_SCAN)
+#define ATH9K_2GHZ_CH14         REG_RULE(2484-10, 2484+10, 40, 0, 20,\
+                                NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_OFDM)
+
+/* We allow IBSS on these on a case by case basis by regulatory domain */
+#define ATH9K_5GHZ_5150_5350    REG_RULE(5150-10, 5350+10, 40, 0, 30,\
+                                NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
+#define ATH9K_5GHZ_5470_5850    REG_RULE(5470-10, 5850+10, 40, 0, 30,\
+                                NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
+#define ATH9K_5GHZ_5725_5850    REG_RULE(5725-10, 5850+10, 40, 0, 30,\
+                                NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
+
+#define ATH9K_2GHZ_ALL          ATH9K_2GHZ_CH01_11, \
+                                ATH9K_2GHZ_CH12_13, \
+                                ATH9K_2GHZ_CH14
+
+#define ATH9K_5GHZ_ALL          ATH9K_5GHZ_5150_5350, \
+                                ATH9K_5GHZ_5470_5850
+/* This one skips what we call "mid band" */
+#define ATH9K_5GHZ_NO_MIDBAND   ATH9K_5GHZ_5150_5350, \
+                                ATH9K_5GHZ_5725_5850
+
+/* Can be used for:
+ * 0x60, 0x61, 0x62 */
+static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
+        .n_reg_rules = 5,
+        .alpha2 =  "99",
+        .reg_rules = {
+                ATH9K_2GHZ_ALL,
+                ATH9K_5GHZ_ALL,
+        }
+};
+
+/* Can be used by 0x63 and 0x65 */
+static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
+        .n_reg_rules = 4,
+        .alpha2 =  "99",
+        .reg_rules = {
+                ATH9K_2GHZ_CH01_11,
+                ATH9K_2GHZ_CH12_13,
+                ATH9K_5GHZ_NO_MIDBAND,
+        }
+};
+
+/* Can be used by 0x64 only */
+static const struct ieee80211_regdomain ath_world_regdom_64 = {
+        .n_reg_rules = 3,
+        .alpha2 =  "99",
+        .reg_rules = {
+                ATH9K_2GHZ_CH01_11,
+                ATH9K_5GHZ_NO_MIDBAND,
+        }
+};
+
+/* Can be used by 0x66 and 0x69 */
+static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
+        .n_reg_rules = 3,
+        .alpha2 =  "99",
+        .reg_rules = {
+                ATH9K_2GHZ_CH01_11,
+                ATH9K_5GHZ_ALL,
+        }
+};
+
+/* Can be used by 0x67, 0x6A and 0x68 */
+static const struct ieee80211_regdomain ath_world_regdom_67_68_6A = {
+        .n_reg_rules = 4,
+        .alpha2 =  "99",
+        .reg_rules = {
+                ATH9K_2GHZ_CH01_11,
+                ATH9K_2GHZ_CH12_13,
+                ATH9K_5GHZ_ALL,
+        }
+};
+
+static inline bool is_wwr_sku(u16 regd)
+{
+        return ((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) ||
+                (regd == WORLD);
+}
+
+static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
+{
+        return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
+}
+
+bool ath_is_world_regd(struct ath_regulatory *reg)
+{
+        return is_wwr_sku(ath_regd_get_eepromRD(reg));
+}
+EXPORT_SYMBOL(ath_is_world_regd);
+
+static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
+{
+        /* this is the most restrictive */
+        return &ath_world_regdom_64;
+}
+
+static const struct
+ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg)
+{
+        switch (reg->regpair->regDmnEnum) {
+        case 0x60:
+        case 0x61:
+        case 0x62:
+                return &ath_world_regdom_60_61_62;
+        case 0x63:
+        case 0x65:
+                return &ath_world_regdom_63_65;
+        case 0x64:
+                return &ath_world_regdom_64;
+        case 0x66:
+        case 0x69:
+                return &ath_world_regdom_66_69;
+        case 0x67:
+        case 0x68:
+        case 0x6A:
+                return &ath_world_regdom_67_68_6A;
+        default:
+                WARN_ON(1);
+                return ath_default_world_regdomain();
+        }
+}
+
+/* Frequency is one where radar detection is required */
+static bool ath_is_radar_freq(u16 center_freq)
+{
+        return (center_freq >= 5260 && center_freq <= 5700);
+}
+
+/*
+ * N.B: These exception rules do not apply radar freqs.
+ *
+ * - We enable adhoc (or beaconing) if allowed by 11d
+ * - We enable active scan if the channel is allowed by 11d
+ * - If no country IE has been processed and a we determine we have
+ *   received a beacon on a channel we can enable active scan and
+ *   adhoc (or beaconing).
+ */
+static void
+ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
+                              enum nl80211_reg_initiator initiator)
+{
+        enum ieee80211_band band;
+        struct ieee80211_supported_band *sband;
+        const struct ieee80211_reg_rule *reg_rule;
+        struct ieee80211_channel *ch;
+        unsigned int i;
+        u32 bandwidth = 0;
+        int r;
+
+        for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+
+                if (!wiphy->bands[band])
+                        continue;
+
+                sband = wiphy->bands[band];
+
+                for (i = 0; i < sband->n_channels; i++) {
+
+                        ch = &sband->channels[i];
+
+                        if (ath_is_radar_freq(ch->center_freq) ||
+                            (ch->flags & IEEE80211_CHAN_RADAR))
+                                continue;
+
+                        if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
+                                r = freq_reg_info(wiphy,
+                                                  ch->center_freq,
+                                                  bandwidth,
+                                                  &reg_rule);
+                                if (r)
+                                        continue;
+                                /*
+                                 * If 11d had a rule for this channel ensure
+                                 * we enable adhoc/beaconing if it allows us to
+                                 * use it. Note that we would have disabled it
+                                 * by applying our static world regdomain by
+                                 * default during init, prior to calling our
+                                 * regulatory_hint().
+                                 */
+                                if (!(reg_rule->flags &
+                                    NL80211_RRF_NO_IBSS))
+                                        ch->flags &=
+                                          ~IEEE80211_CHAN_NO_IBSS;
+                                if (!(reg_rule->flags &
+                                    NL80211_RRF_PASSIVE_SCAN))
+                                        ch->flags &=
+                                          ~IEEE80211_CHAN_PASSIVE_SCAN;
+                        } else {
+                                if (ch->beacon_found)
+                                        ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
+                                          IEEE80211_CHAN_PASSIVE_SCAN);
+                        }
+                }
+        }
+
+}
+
+/* Allows active scan scan on Ch 12 and 13 */
+static void
+ath_reg_apply_active_scan_flags(struct wiphy *wiphy,
+                                enum nl80211_reg_initiator initiator)
+{
+        struct ieee80211_supported_band *sband;
+        struct ieee80211_channel *ch;
+        const struct ieee80211_reg_rule *reg_rule;
+        u32 bandwidth = 0;
+        int r;
+
+        sband = wiphy->bands[IEEE80211_BAND_2GHZ];
+
+        /*
+         * If no country IE has been received always enable active scan
+         * on these channels. This is only done for specific regulatory SKUs
+         */
+        if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
+                ch = &sband->channels[11]; /* CH 12 */
+                if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
+                        ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
+                ch = &sband->channels[12]; /* CH 13 */
+                if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
+                        ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
+                return;
+        }
+
+        /*
+         * If a country IE has been recieved check its rule for this
+         * channel first before enabling active scan. The passive scan
+         * would have been enforced by the initial processing of our
+         * custom regulatory domain.
+         */
+
+        ch = &sband->channels[11]; /* CH 12 */
+        r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
+        if (!r) {
+                if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
+                        if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
+                                ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
+        }
+
+        ch = &sband->channels[12]; /* CH 13 */
+        r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
+        if (!r) {
+                if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
+                        if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
+                                ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
+        }
+}
+
+/* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
+static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
+{
+        struct ieee80211_supported_band *sband;
+        struct ieee80211_channel *ch;
+        unsigned int i;
+
+        if (!wiphy->bands[IEEE80211_BAND_5GHZ])
+                return;
+
+        sband = wiphy->bands[IEEE80211_BAND_5GHZ];
+
+        for (i = 0; i < sband->n_channels; i++) {
+                ch = &sband->channels[i];
+                if (!ath_is_radar_freq(ch->center_freq))
+                        continue;
+                /* We always enable radar detection/DFS on this
+                 * frequency range. Additionally we also apply on
+                 * this frequency range:
+                 * - If STA mode does not yet have DFS supports disable
+                 *   active scanning
+                 * - If adhoc mode does not support DFS yet then
+                 *   disable adhoc in the frequency.
+                 * - If AP mode does not yet support radar detection/DFS
+                 *   do not allow AP mode
+                 */
+                if (!(ch->flags & IEEE80211_CHAN_DISABLED))
+                        ch->flags |= IEEE80211_CHAN_RADAR |
+                                     IEEE80211_CHAN_NO_IBSS |
+                                     IEEE80211_CHAN_PASSIVE_SCAN;
+        }
+}
+
+static void ath_reg_apply_world_flags(struct wiphy *wiphy,
+                                      enum nl80211_reg_initiator initiator,
+                                      struct ath_regulatory *reg)
+{
+        switch (reg->regpair->regDmnEnum) {
+        case 0x60:
+        case 0x63:
+        case 0x66:
+        case 0x67:
+                ath_reg_apply_beaconing_flags(wiphy, initiator);
+                break;
+        case 0x68:
+                ath_reg_apply_beaconing_flags(wiphy, initiator);
+                ath_reg_apply_active_scan_flags(wiphy, initiator);
+                break;
+        }
+        return;
+}
+
+int ath_reg_notifier_apply(struct wiphy *wiphy,
+                           struct regulatory_request *request,
+                           struct ath_regulatory *reg)
+{
+        /* We always apply this */
+        ath_reg_apply_radar_flags(wiphy);
+
+        switch (request->initiator) {
+        case NL80211_REGDOM_SET_BY_DRIVER:
+        case NL80211_REGDOM_SET_BY_CORE:
+        case NL80211_REGDOM_SET_BY_USER:
+                break;
+        case NL80211_REGDOM_SET_BY_COUNTRY_IE:
+                if (ath_is_world_regd(reg))
+                        ath_reg_apply_world_flags(wiphy, request->initiator,
+                                                  reg);
+                break;
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL(ath_reg_notifier_apply);
+
+static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
+{
+         u16 rd = ath_regd_get_eepromRD(reg);
+        int i;
+
+        if (rd & COUNTRY_ERD_FLAG) {
+                /* EEPROM value is a country code */
+                u16 cc = rd & ~COUNTRY_ERD_FLAG;
+                printk(KERN_DEBUG
+                       "ath: EEPROM indicates we should expect "
+                        "a country code\n");
+                for (i = 0; i < ARRAY_SIZE(allCountries); i++)
+                        if (allCountries[i].countryCode == cc)
+                                return true;
+        } else {
+                /* EEPROM value is a regpair value */
+                if (rd != CTRY_DEFAULT)
+                        printk(KERN_DEBUG "ath: EEPROM indicates we "
+                               "should expect a direct regpair map\n");
+                for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
+                        if (regDomainPairs[i].regDmnEnum == rd)
+                                return true;
+        }
+        printk(KERN_DEBUG
+                 "ath: invalid regulatory domain/country code 0x%x\n", rd);
+        return false;
+}
+
+/* EEPROM country code to regpair mapping */
+static struct country_code_to_enum_rd*
+ath_regd_find_country(u16 countryCode)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
+                if (allCountries[i].countryCode == countryCode)
+                        return &allCountries[i];
+        }
+        return NULL;
+}
+
+/* EEPROM rd code to regpair mapping */
+static struct country_code_to_enum_rd*
+ath_regd_find_country_by_rd(int regdmn)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
+                if (allCountries[i].regDmnEnum == regdmn)
+                        return &allCountries[i];
+        }
+        return NULL;
+}
+
+/* Returns the map of the EEPROM set RD to a country code */
+static u16 ath_regd_get_default_country(u16 rd)
+{
+        if (rd & COUNTRY_ERD_FLAG) {
+                struct country_code_to_enum_rd *country = NULL;
+                u16 cc = rd & ~COUNTRY_ERD_FLAG;
+
+                country = ath_regd_find_country(cc);
+                if (country != NULL)
+                        return cc;
+        }
+
+        return CTRY_DEFAULT;
+}
+
+static struct reg_dmn_pair_mapping*
+ath_get_regpair(int regdmn)
+{
+        int i;
+
+        if (regdmn == NO_ENUMRD)
+                return NULL;
+        for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
+                if (regDomainPairs[i].regDmnEnum == regdmn)
+                        return &regDomainPairs[i];
+        }
+        return NULL;
+}
+
+static int
+ath_regd_init_wiphy(struct ath_regulatory *reg,
+                    struct wiphy *wiphy,
+                    int (*reg_notifier)(struct wiphy *wiphy,
+                                        struct regulatory_request *request))
+{
+        const struct ieee80211_regdomain *regd;
+
+        wiphy->reg_notifier = reg_notifier;
+        wiphy->strict_regulatory = true;
+
+        if (ath_is_world_regd(reg)) {
+                /*
+                 * Anything applied here (prior to wiphy registration) gets
+                 * saved on the wiphy orig_* parameters
+                 */
+                regd = ath_world_regdomain(reg);
+                wiphy->custom_regulatory = true;
+                wiphy->strict_regulatory = false;
+        } else {
+                /*
+                 * This gets applied in the case of the absense of CRDA,
+                 * it's our own custom world regulatory domain, similar to
+                 * cfg80211's but we enable passive scanning.
+                 */
+                regd = ath_default_world_regdomain();
+        }
+        wiphy_apply_custom_regulatory(wiphy, regd);
+        ath_reg_apply_radar_flags(wiphy);
+        ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
+        return 0;
+}
+
+int
+ath_regd_init(struct ath_regulatory *reg,
+              struct wiphy *wiphy,
+              int (*reg_notifier)(struct wiphy *wiphy,
+                                  struct regulatory_request *request))
+{
+        struct country_code_to_enum_rd *country = NULL;
+        u16 regdmn;
+
+        if (!reg)
+                return -EINVAL;
+
+        printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);
+
+        if (!ath_regd_is_eeprom_valid(reg)) {
+                printk(KERN_ERR "ath: Invalid EEPROM contents\n");
+                return -EINVAL;
+        }
+
+        regdmn = ath_regd_get_eepromRD(reg);
+        reg->country_code = ath_regd_get_default_country(regdmn);
+
+        if (reg->country_code == CTRY_DEFAULT &&
+            regdmn == CTRY_DEFAULT) {
+                printk(KERN_DEBUG "ath: EEPROM indicates default "
+                       "country code should be used\n");
+                reg->country_code = CTRY_UNITED_STATES;
+        }
+
+        if (reg->country_code == CTRY_DEFAULT) {
+                country = NULL;
+        } else {
+                printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
+                       "map search\n");
+                country = ath_regd_find_country(reg->country_code);
+                if (country == NULL) {
+                        printk(KERN_DEBUG
+                                "ath: no valid country maps found for "
+                                "country code: 0x%0x\n",
+                                reg->country_code);
+                        return -EINVAL;
+                } else {
+                        regdmn = country->regDmnEnum;
+                        printk(KERN_DEBUG "ath: country maps to "
+                               "regdmn code: 0x%0x\n",
+                               regdmn);
+                }
+        }
+
+        reg->regpair = ath_get_regpair(regdmn);
+
+        if (!reg->regpair) {
+                printk(KERN_DEBUG "ath: "
+                        "No regulatory domain pair found, cannot continue\n");
+                return -EINVAL;
+        }
+
+        if (!country)
+                country = ath_regd_find_country_by_rd(regdmn);
+
+        if (country) {
+                reg->alpha2[0] = country->isoName[0];
+                reg->alpha2[1] = country->isoName[1];
+        } else {
+                reg->alpha2[0] = '0';
+                reg->alpha2[1] = '0';
+        }
+
+        printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
+                reg->alpha2[0], reg->alpha2[1]);
+        printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
+                reg->regpair->regDmnEnum);
+
+        ath_regd_init_wiphy(reg, wiphy, reg_notifier);
+        return 0;
+}
+EXPORT_SYMBOL(ath_regd_init);
+
+u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
+                          enum ieee80211_band band)
+{
+        if (!reg->regpair ||
+            (reg->country_code == CTRY_DEFAULT &&
+             is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
+                return SD_NO_CTL;
+        }
+
+        switch (band) {
+        case IEEE80211_BAND_2GHZ:
+                return reg->regpair->reg_2ghz_ctl;
+        case IEEE80211_BAND_5GHZ:
+                return reg->regpair->reg_5ghz_ctl;
+        default:
+                return NO_CTL;
+        }
+
+        return NO_CTL;
+}
+EXPORT_SYMBOL(ath_regd_get_band_ctl);