cfg80211: add wiphy_apply_custom_regulatory()

This adds wiphy_apply_custom_regulatory() to be used by drivers
prior to wiphy registration to apply a custom regulatory domain.
This can be used by drivers that do not have a direct 1-1 mapping
between a regulatory domain and a country.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 91 insertions, 24 deletions

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index b34fd84b3e2f..0d6059502b40 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -782,36 +782,18 @@ static u32 map_regdom_flags(u32 rd_flags)
         return channel_flags;
 }
 
-/**
- * freq_reg_info - get regulatory information for the given frequency
- * @wiphy: the wiphy for which we want to process this rule for
- * @center_freq: Frequency in KHz for which we want regulatory information for
- * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one
- *      you can set this to 0. If this frequency is allowed we then set
- *      this value to the maximum allowed bandwidth.
- * @reg_rule: the regulatory rule which we have for this frequency
- *
- * Use this function to get the regulatory rule for a specific frequency on
- * a given wireless device. If the device has a specific regulatory domain
- * it wants to follow we respect that unless a country IE has been received
- * and processed already.
- *
- * Returns 0 if it was able to find a valid regulatory rule which does
- * apply to the given center_freq otherwise it returns non-zero. It will
- * also return -ERANGE if we determine the given center_freq does not even have
- * a regulatory rule for a frequency range in the center_freq's band. See
- * freq_in_rule_band() for our current definition of a band -- this is purely
- * subjective and right now its 802.11 specific.
- */
-static int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
-                         const struct ieee80211_reg_rule **reg_rule)
+static int freq_reg_info_regd(struct wiphy *wiphy,
+                              u32 center_freq,
+                              u32 *bandwidth,
+                              const struct ieee80211_reg_rule **reg_rule,
+                              const struct ieee80211_regdomain *custom_regd)
 {
         int i;
         bool band_rule_found = false;
         const struct ieee80211_regdomain *regd;
         u32 max_bandwidth = 0;
 
-        regd = cfg80211_regdomain;
+        regd = custom_regd ? custom_regd : cfg80211_regdomain;
 
         /* Follow the driver's regulatory domain, if present, unless a country
          * IE has been processed */
@@ -852,6 +834,34 @@ static int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
         return !max_bandwidth;
 }
 
+/**
+ * freq_reg_info - get regulatory information for the given frequency
+ * @wiphy: the wiphy for which we want to process this rule for
+ * @center_freq: Frequency in KHz for which we want regulatory information for
+ * @bandwidth: the bandwidth requirement you have in KHz, if you do not have one
+ *      you can set this to 0. If this frequency is allowed we then set
+ *      this value to the maximum allowed bandwidth.
+ * @reg_rule: the regulatory rule which we have for this frequency
+ *
+ * Use this function to get the regulatory rule for a specific frequency on
+ * a given wireless device. If the device has a specific regulatory domain
+ * it wants to follow we respect that unless a country IE has been received
+ * and processed already.
+ *
+ * Returns 0 if it was able to find a valid regulatory rule which does
+ * apply to the given center_freq otherwise it returns non-zero. It will
+ * also return -ERANGE if we determine the given center_freq does not even have
+ * a regulatory rule for a frequency range in the center_freq's band. See
+ * freq_in_rule_band() for our current definition of a band -- this is purely
+ * subjective and right now its 802.11 specific.
+ */
+static int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
+                         const struct ieee80211_reg_rule **reg_rule)
+{
+        return freq_reg_info_regd(wiphy, center_freq,
+                bandwidth, reg_rule, NULL);
+}
+
 static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
                            unsigned int chan_idx)
 {
@@ -962,6 +972,63 @@ void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby)
                 wiphy->reg_notifier(wiphy, setby);
 }
 
+static void handle_channel_custom(struct wiphy *wiphy,
+                                  enum ieee80211_band band,
+                                  unsigned int chan_idx,
+                                  const struct ieee80211_regdomain *regd)
+{
+        int r;
+        u32 max_bandwidth = 0;
+        const struct ieee80211_reg_rule *reg_rule = NULL;
+        const struct ieee80211_power_rule *power_rule = NULL;
+        struct ieee80211_supported_band *sband;
+        struct ieee80211_channel *chan;
+
+        sband = wiphy->bands[band];
+        BUG_ON(chan_idx >= sband->n_channels);
+        chan = &sband->channels[chan_idx];
+
+        r = freq_reg_info_regd(wiphy, MHZ_TO_KHZ(chan->center_freq),
+                &max_bandwidth, &reg_rule, regd);
+
+        if (r) {
+                chan->flags = IEEE80211_CHAN_DISABLED;
+                return;
+        }
+
+        power_rule = &reg_rule->power_rule;
+
+        chan->flags |= map_regdom_flags(reg_rule->flags);
+        chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
+        chan->max_bandwidth = KHZ_TO_MHZ(max_bandwidth);
+        chan->max_power = (int) MBM_TO_DBM(power_rule->max_eirp);
+}
+
+static void handle_band_custom(struct wiphy *wiphy, enum ieee80211_band band,
+                               const struct ieee80211_regdomain *regd)
+{
+        unsigned int i;
+        struct ieee80211_supported_band *sband;
+
+        BUG_ON(!wiphy->bands[band]);
+        sband = wiphy->bands[band];
+
+        for (i = 0; i < sband->n_channels; i++)
+                handle_channel_custom(wiphy, band, i, regd);
+}
+
+/* Used by drivers prior to wiphy registration */
+void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
+                                   const struct ieee80211_regdomain *regd)
+{
+        enum ieee80211_band band;
+        for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+                if (wiphy->bands[band])
+                        handle_band_custom(wiphy, band, regd);
+        }
+}
+EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
+
 static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
                          const struct ieee80211_regdomain *src_regd)
 {