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_get_hw_crypto_keytype(struct sk_buff *skb)
  31 {
  32         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
  33
  34         if (tx_info->control.hw_key) {
  35                 switch (tx_info->control.hw_key->cipher) {
  36                 case WLAN_CIPHER_SUITE_WEP40:
  37                 case WLAN_CIPHER_SUITE_WEP104:
  38                         return ATH9K_KEY_TYPE_WEP;
  39                 case WLAN_CIPHER_SUITE_TKIP:
  40                         return ATH9K_KEY_TYPE_TKIP;
  41                 case WLAN_CIPHER_SUITE_CCMP:
  42                         return ATH9K_KEY_TYPE_AES;
  43                 default:
  44                         break;
  45                 }
  46         }
  47
  48         return ATH9K_KEY_TYPE_CLEAR;
  49 }
  50 EXPORT_SYMBOL(ath9k_cmn_get_hw_crypto_keytype);
  51
  52 static u32 ath9k_get_extchanmode(struct ieee80211_channel *chan,
  53                                  enum nl80211_channel_type channel_type)
  54 {
  55         u32 chanmode = 0;
  56
  57         switch (chan->band) {
  58         case IEEE80211_BAND_2GHZ:
  59                 switch (channel_type) {
  60                 case NL80211_CHAN_NO_HT:
  61                 case NL80211_CHAN_HT20:
  62                         chanmode = CHANNEL_G_HT20;
  63                         break;
  64                 case NL80211_CHAN_HT40PLUS:
  65                         chanmode = CHANNEL_G_HT40PLUS;
  66                         break;
  67                 case NL80211_CHAN_HT40MINUS:
  68                         chanmode = CHANNEL_G_HT40MINUS;
  69                         break;
  70                 }
  71                 break;
  72         case IEEE80211_BAND_5GHZ:
  73                 switch (channel_type) {
  74                 case NL80211_CHAN_NO_HT:
  75                 case NL80211_CHAN_HT20:
  76                         chanmode = CHANNEL_A_HT20;
  77                         break;
  78                 case NL80211_CHAN_HT40PLUS:
  79                         chanmode = CHANNEL_A_HT40PLUS;
  80                         break;
  81                 case NL80211_CHAN_HT40MINUS:
  82                         chanmode = CHANNEL_A_HT40MINUS;
  83                         break;
  84                 }
  85                 break;
  86         default:
  87                 break;
  88         }
  89
  90         return chanmode;
  91 }
  92
  93 /*
  94  * Update internal channel flags.
  95  */
  96 void ath9k_cmn_update_ichannel(struct ath9k_channel *ichan,
  97                                struct ieee80211_channel *chan,
  98                                enum nl80211_channel_type channel_type)
  99 {
 100         ichan->channel = chan->center_freq;
 101         ichan->chan = chan;
 102
 103         if (chan->band == IEEE80211_BAND_2GHZ) {
 104                 ichan->chanmode = CHANNEL_G;
 105                 ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM;
 106         } else {
 107                 ichan->chanmode = CHANNEL_A;
 108                 ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM;
 109         }
 110
 111         if (channel_type != NL80211_CHAN_NO_HT)
 112                 ichan->chanmode = ath9k_get_extchanmode(chan, channel_type);
 113 }
 114 EXPORT_SYMBOL(ath9k_cmn_update_ichannel);
 115
 116 /*
 117  * Get the internal channel reference.
 118  */
 119 struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw,
 120                                                struct ath_hw *ah)
 121 {
 122         struct ieee80211_channel *curchan = hw->conf.chandef.chan;
 123         struct ath9k_channel *channel;
 124         u8 chan_idx;
 125
 126         chan_idx = curchan->hw_value;
 127         channel = &ah->channels[chan_idx];
 128         ath9k_cmn_update_ichannel(channel, curchan,
 129                                   cfg80211_get_chandef_type(&hw->conf.chandef));
 130
 131         return channel;
 132 }
 133 EXPORT_SYMBOL(ath9k_cmn_get_curchannel);
 134
 135 int ath9k_cmn_count_streams(unsigned int chainmask, int max)
 136 {
 137         int streams = 0;
 138
 139         do {
 140                 if (++streams == max)
 141                         break;
 142         } while ((chainmask = chainmask & (chainmask - 1)));
 143
 144         return streams;
 145 }
 146 EXPORT_SYMBOL(ath9k_cmn_count_streams);
 147
 148 void ath9k_cmn_update_txpow(struct ath_hw *ah, u16 cur_txpow,
 149                             u16 new_txpow, u16 *txpower)
 150 {
 151         struct ath_regulatory *reg = ath9k_hw_regulatory(ah);
 152
 153         if (reg->power_limit != new_txpow) {
 154                 ath9k_hw_set_txpowerlimit(ah, new_txpow, false);
 155                 /* read back in case value is clamped */
 156                 *txpower = reg->max_power_level;
 157         }
 158 }
 159 EXPORT_SYMBOL(ath9k_cmn_update_txpow);
 160
 161 void ath9k_cmn_init_crypto(struct ath_hw *ah)
 162 {
 163         struct ath_common *common = ath9k_hw_common(ah);
 164         int i = 0;
 165
 166         /* Get the hardware key cache size. */
 167         common->keymax = AR_KEYTABLE_SIZE;
 168
 169         /*
 170          * Check whether the separate key cache entries
 171          * are required to handle both tx+rx MIC keys.
 172          * With split mic keys the number of stations is limited
 173          * to 27 otherwise 59.
 174          */
 175         if (ah->misc_mode & AR_PCU_MIC_NEW_LOC_ENA)
 176                 common->crypt_caps |= ATH_CRYPT_CAP_MIC_COMBINED;
 177
 178         /*
 179          * Reset the key cache since some parts do not
 180          * reset the contents on initial power up.
 181          */
 182         for (i = 0; i < common->keymax; i++)
 183                 ath_hw_keyreset(common, (u16) i);
 184 }
 185 EXPORT_SYMBOL(ath9k_cmn_init_crypto);
 186
 187 static int __init ath9k_cmn_init(void)
 188 {
 189         return 0;
 190 }
 191 module_init(ath9k_cmn_init);
 192
 193 static void __exit ath9k_cmn_exit(void)
 194 {
 195         return;
 196 }
 197 module_exit(ath9k_cmn_exit);