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

   1 /*
   2  * Copyright (c) 2009-2011 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 ath9k_channel *ichan,
 111                                struct ieee80211_channel *chan,
 112                                enum nl80211_channel_type channel_type)
 113 {
 114         ichan->channel = chan->center_freq;
 115         ichan->chan = chan;
 116
 117         if (chan->band == IEEE80211_BAND_2GHZ) {
 118                 ichan->chanmode = CHANNEL_G;
 119                 ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM;
 120         } else {
 121                 ichan->chanmode = CHANNEL_A;
 122                 ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM;
 123         }
 124
 125         if (channel_type != NL80211_CHAN_NO_HT)
 126                 ichan->chanmode = ath9k_get_extchanmode(chan, channel_type);
 127 }
 128 EXPORT_SYMBOL(ath9k_cmn_update_ichannel);
 129
 130 /*
 131  * Get the internal channel reference.
 132  */
 133 struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw,
 134                                                struct ath_hw *ah)
 135 {
 136         struct ieee80211_channel *curchan = hw->conf.channel;
 137         struct ath9k_channel *channel;
 138         u8 chan_idx;
 139
 140         chan_idx = curchan->hw_value;
 141         channel = &ah->channels[chan_idx];
 142         ath9k_cmn_update_ichannel(channel, curchan, hw->conf.channel_type);
 143
 144         return channel;
 145 }
 146 EXPORT_SYMBOL(ath9k_cmn_get_curchannel);
 147
 148 int ath9k_cmn_count_streams(unsigned int chainmask, int max)
 149 {
 150         int streams = 0;
 151
 152         do {
 153                 if (++streams == max)
 154                         break;
 155         } while ((chainmask = chainmask & (chainmask - 1)));
 156
 157         return streams;
 158 }
 159 EXPORT_SYMBOL(ath9k_cmn_count_streams);
 160
 161 void ath9k_cmn_update_txpow(struct ath_hw *ah, u16 cur_txpow,
 162                             u16 new_txpow, u16 *txpower)
 163 {
 164         struct ath_regulatory *reg = ath9k_hw_regulatory(ah);
 165
 166         if (reg->power_limit != new_txpow) {
 167                 ath9k_hw_set_txpowerlimit(ah, new_txpow, false);
 168                 /* read back in case value is clamped */
 169                 *txpower = reg->max_power_level;
 170         }
 171 }
 172 EXPORT_SYMBOL(ath9k_cmn_update_txpow);
 173
 174 void ath9k_cmn_init_crypto(struct ath_hw *ah)
 175 {
 176         struct ath_common *common = ath9k_hw_common(ah);
 177         int i = 0;
 178
 179         /* Get the hardware key cache size. */
 180         common->keymax = AR_KEYTABLE_SIZE;
 181
 182         /*
 183          * Check whether the separate key cache entries
 184          * are required to handle both tx+rx MIC keys.
 185          * With split mic keys the number of stations is limited
 186          * to 27 otherwise 59.
 187          */
 188         if (ah->misc_mode & AR_PCU_MIC_NEW_LOC_ENA)
 189                 common->crypt_caps |= ATH_CRYPT_CAP_MIC_COMBINED;
 190
 191         /*
 192          * Reset the key cache since some parts do not
 193          * reset the contents on initial power up.
 194          */
 195         for (i = 0; i < common->keymax; i++)
 196                 ath_hw_keyreset(common, (u16) i);
 197 }
 198 EXPORT_SYMBOL(ath9k_cmn_init_crypto);
 199
 200 static int __init ath9k_cmn_init(void)
 201 {
 202         return 0;
 203 }
 204 module_init(ath9k_cmn_init);
 205
 206 static void __exit ath9k_cmn_exit(void)
 207 {
 208         return;
 209 }
 210 module_exit(ath9k_cmn_exit);