drivers/net/wireless/ath/ath9k/common.c

   1 /*
   2  * Copyright (c) 2009 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 /*
  18  * Module for common driver code between ath9k and ath9k_htc
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23
  24 #include "common.h"
  25
  26 MODULE_AUTHOR("Atheros Communications");
  27 MODULE_DESCRIPTION("Shared library for Atheros wireless 802.11n LAN cards.");
  28 MODULE_LICENSE("Dual BSD/GPL");
  29
  30 int ath9k_cmn_padpos(__le16 frame_control)
  31 {
  32         int padpos = 24;
  33         if (ieee80211_has_a4(frame_control)) {
  34                 padpos += ETH_ALEN;
  35         }
  36         if (ieee80211_is_data_qos(frame_control)) {
  37                 padpos += IEEE80211_QOS_CTL_LEN;
  38         }
  39
  40         return padpos;
  41 }
  42 EXPORT_SYMBOL(ath9k_cmn_padpos);
  43
  44 int ath9k_cmn_get_hw_crypto_keytype(struct sk_buff *skb)
  45 {
  46         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
  47
  48         if (tx_info->control.hw_key) {
  49                 switch (tx_info->control.hw_key->cipher) {
  50                 case WLAN_CIPHER_SUITE_WEP40:
  51                 case WLAN_CIPHER_SUITE_WEP104:
  52                         return ATH9K_KEY_TYPE_WEP;
  53                 case WLAN_CIPHER_SUITE_TKIP:
  54                         return ATH9K_KEY_TYPE_TKIP;
  55                 case WLAN_CIPHER_SUITE_CCMP:
  56                         return ATH9K_KEY_TYPE_AES;
  57                 default:
  58                         break;
  59                 }
  60         }
  61
  62         return ATH9K_KEY_TYPE_CLEAR;
  63 }
  64 EXPORT_SYMBOL(ath9k_cmn_get_hw_crypto_keytype);
  65
  66 static u32 ath9k_get_extchanmode(struct ieee80211_channel *chan,
  67                                  enum nl80211_channel_type channel_type)
  68 {
  69         u32 chanmode = 0;
  70
  71         switch (chan->band) {
  72         case IEEE80211_BAND_2GHZ:
  73                 switch (channel_type) {
  74                 case NL80211_CHAN_NO_HT:
  75                 case NL80211_CHAN_HT20:
  76                         chanmode = CHANNEL_G_HT20;
  77                         break;
  78                 case NL80211_CHAN_HT40PLUS:
  79                         chanmode = CHANNEL_G_HT40PLUS;
  80                         break;
  81                 case NL80211_CHAN_HT40MINUS:
  82                         chanmode = CHANNEL_G_HT40MINUS;
  83                         break;
  84                 }
  85                 break;
  86         case IEEE80211_BAND_5GHZ:
  87                 switch (channel_type) {
  88                 case NL80211_CHAN_NO_HT:
  89                 case NL80211_CHAN_HT20:
  90                         chanmode = CHANNEL_A_HT20;
  91                         break;
  92                 case NL80211_CHAN_HT40PLUS:
  93                         chanmode = CHANNEL_A_HT40PLUS;
  94                         break;
  95                 case NL80211_CHAN_HT40MINUS:
  96                         chanmode = CHANNEL_A_HT40MINUS;
  97                         break;
  98                 }
  99                 break;
 100         default:
 101                 break;
 102         }
 103
 104         return chanmode;
 105 }
 106
 107 /*
 108  * Update internal channel flags.
 109  */
 110 void ath9k_cmn_update_ichannel(struct ieee80211_hw *hw,
 111                                struct ath9k_channel *ichan)
 112 {
 113         struct ieee80211_channel *chan = hw->conf.channel;
 114         struct ieee80211_conf *conf = &hw->conf;
 115
 116         ichan->channel = chan->center_freq;
 117         ichan->chan = chan;
 118
 119         if (chan->band == IEEE80211_BAND_2GHZ) {
 120                 ichan->chanmode = CHANNEL_G;
 121                 ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM | CHANNEL_G;
 122         } else {
 123                 ichan->chanmode = CHANNEL_A;
 124                 ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM;
 125         }
 126
 127         if (conf_is_ht(conf))
 128                 ichan->chanmode = ath9k_get_extchanmode(chan,
 129                                                         conf->channel_type);
 130 }
 131 EXPORT_SYMBOL(ath9k_cmn_update_ichannel);
 132
 133 /*
 134  * Get the internal channel reference.
 135  */
 136 struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw,
 137                                                struct ath_hw *ah)
 138 {
 139         struct ieee80211_channel *curchan = hw->conf.channel;
 140         struct ath9k_channel *channel;
 141         u8 chan_idx;
 142
 143         chan_idx = curchan->hw_value;
 144         channel = &ah->channels[chan_idx];
 145         ath9k_cmn_update_ichannel(hw, channel);
 146
 147         return channel;
 148 }
 149 EXPORT_SYMBOL(ath9k_cmn_get_curchannel);
 150
 151 int ath9k_cmn_count_streams(unsigned int chainmask, int max)
 152 {
 153         int streams = 0;
 154
 155         do {
 156                 if (++streams == max)
 157                         break;
 158         } while ((chainmask = chainmask & (chainmask - 1)));
 159
 160         return streams;
 161 }
 162 EXPORT_SYMBOL(ath9k_cmn_count_streams);
 163
 164 /*
 165  * Configures appropriate weight based on stomp type.
 166  */
 167 void ath9k_cmn_btcoex_bt_stomp(struct ath_common *common,
 168                                   enum ath_stomp_type stomp_type)
 169 {
 170         struct ath_hw *ah = common->ah;
 171
 172         switch (stomp_type) {
 173         case ATH_BTCOEX_STOMP_ALL:
 174                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 175                                            AR_STOMP_ALL_WLAN_WGHT);
 176                 break;
 177         case ATH_BTCOEX_STOMP_LOW:
 178                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 179                                            AR_STOMP_LOW_WLAN_WGHT);
 180                 break;
 181         case ATH_BTCOEX_STOMP_NONE:
 182                 ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
 183                                            AR_STOMP_NONE_WLAN_WGHT);
 184                 break;
 185         default:
 186                 ath_print(common, ATH_DBG_BTCOEX,
 187                           "Invalid Stomptype\n");
 188                 break;
 189         }
 190
 191         ath9k_hw_btcoex_enable(ah);
 192 }
 193 EXPORT_SYMBOL(ath9k_cmn_btcoex_bt_stomp);
 194
 195 static int __init ath9k_cmn_init(void)
 196 {
 197         return 0;
 198 }
 199 module_init(ath9k_cmn_init);
 200
 201 static void __exit ath9k_cmn_exit(void)
 202 {
 203         return;
 204 }
 205 module_exit(ath9k_cmn_exit);