wlcore: clarify and fix regulatory domain bit translation

Channels 52-64 were mapped incorrectly.

Refactor and document wlcore_get_reg_conf_ch_idx() in
order to make it clear what's going on there.

While on it, fix the return value check to consider
0 as a valid return value as well (indicates channel 1).

Reported-by: Yaniv Machani <yanivma@ti.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Ido Reis <idor@ti.com>
Signed-off-by: Victor Goldenshtein <victorg@ti.com>
Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>

diff --git a/drivers/net/wireless/ti/wlcore/cmd.c b/drivers/net/wireless/ti/wlcore/cmd.c
index e3ae425..9e5416f 100644 (file)
--- a/drivers/net/wireless/ti/wlcore/cmd.c
+++ b/drivers/net/wireless/ti/wlcore/cmd.c
@@ -1607,33 +1607,43 @@ out:
 
 static int wlcore_get_reg_conf_ch_idx(enum ieee80211_band band, u16 ch)
 {
-       int idx = -1;
-
+       /*
+        * map the given band/channel to the respective predefined
+        * bit expected by the fw
+        */
        switch (band) {
-       case IEEE80211_BAND_5GHZ:
-               if (ch >= 8 && ch <= 16)
-                       idx = ((ch-8)/4 + 18);
-               else if (ch >= 34 && ch <= 64)
-                       idx = ((ch-34)/2 + 3 + 18);
-               else if (ch >= 100 && ch <= 140)
-                       idx = ((ch-100)/4 + 15 + 18);
-               else if (ch >= 149 && ch <= 165)
-                       idx = ((ch-149)/4 + 26 + 18);
-               else
-                       idx = -1;
-               break;
        case IEEE80211_BAND_2GHZ:
+               /* channels 1..14 are mapped to 0..13 */
                if (ch >= 1 && ch <= 14)
-                       idx = ch - 1;
-               else
-                       idx = -1;
+                       return ch - 1;
+               break;
+       case IEEE80211_BAND_5GHZ:
+               switch (ch) {
+               case 8 ... 16:
+                       /* channels 8,12,16 are mapped to 18,19,20 */
+                       return 18 + (ch-8)/4;
+               case 34 ... 48:
+                       /* channels 34,36..48 are mapped to 21..28 */
+                       return 21 + (ch-34)/2;
+               case 52 ... 64:
+                       /* channels 52,56..64 are mapped to 29..32 */
+                       return 29 + (ch-52)/4;
+               case 100 ... 140:
+                       /* channels 100,104..140 are mapped to 33..43 */
+                       return 33 + (ch-100)/4;
+               case 149 ... 165:
+                       /* channels 149,153..165 are mapped to 44..48 */
+                       return 44 + (ch-149)/4;
+               default:
+                       break;
+               }
                break;
        default:
-               wl1271_error("get reg conf ch idx - unknown band: %d",
-                            (int)band);
+               break;
        }
 
-       return idx;
+       wl1271_error("%s: unknown band/channel: %d/%d", __func__, band, ch);
+       return -1;
 }
 
 void wlcore_set_pending_regdomain_ch(struct wl1271 *wl, u16 channel,
@@ -1646,7 +1656,7 @@ void wlcore_set_pending_regdomain_ch(struct wl1271 *wl, u16 channel,
 
        ch_bit_idx = wlcore_get_reg_conf_ch_idx(band, channel);
 
-       if (ch_bit_idx > 0 && ch_bit_idx <= WL1271_MAX_CHANNELS)
+       if (ch_bit_idx >= 0 && ch_bit_idx <= WL1271_MAX_CHANNELS)
                set_bit(ch_bit_idx, (long *)wl->reg_ch_conf_pending);
 }