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 /*
  53  * Update internal channel flags.
  54  */
  55 static void ath9k_cmn_update_ichannel(struct ath9k_channel *ichan,
  56                                       struct cfg80211_chan_def *chandef)
  57 {
  58         struct ieee80211_channel *chan = chandef->chan;
  59         u16 flags = 0;
  60
  61         ichan->channel = chan->center_freq;
  62         ichan->chan = chan;
  63
  64         if (chan->band == IEEE80211_BAND_5GHZ)
  65                 flags |= CHANNEL_5GHZ;
  66
  67         switch (chandef->width) {
  68         case NL80211_CHAN_WIDTH_5:
  69                 flags |= CHANNEL_QUARTER;
  70                 break;
  71         case NL80211_CHAN_WIDTH_10:
  72                 flags |= CHANNEL_HALF;
  73                 break;
  74         case NL80211_CHAN_WIDTH_20_NOHT:
  75                 break;
  76         case NL80211_CHAN_WIDTH_20:
  77                 flags |= CHANNEL_HT;
  78                 break;
  79         case NL80211_CHAN_WIDTH_40:
  80                 if (chandef->center_freq1 > chandef->chan->center_freq)
  81                         flags |= CHANNEL_HT40PLUS | CHANNEL_HT;
  82                 else
  83                         flags |= CHANNEL_HT40MINUS | CHANNEL_HT;
  84                 break;
  85         default:
  86                 WARN_ON(1);
  87         }
  88
  89         ichan->channelFlags = flags;
  90 }
  91
  92 /*
  93  * Get the internal channel reference.
  94  */
  95 struct ath9k_channel *ath9k_cmn_get_channel(struct ieee80211_hw *hw,
  96                                             struct ath_hw *ah,
  97                                             struct cfg80211_chan_def *chandef)
  98 {
  99         struct ieee80211_channel *curchan = chandef->chan;
 100         struct ath9k_channel *channel;
 101
 102         channel = &ah->channels[curchan->hw_value];
 103         ath9k_cmn_update_ichannel(channel, chandef);
 104
 105         return channel;
 106 }
 107 EXPORT_SYMBOL(ath9k_cmn_get_channel);
 108
 109 int ath9k_cmn_count_streams(unsigned int chainmask, int max)
 110 {
 111         int streams = 0;
 112
 113         do {
 114                 if (++streams == max)
 115                         break;
 116         } while ((chainmask = chainmask & (chainmask - 1)));
 117
 118         return streams;
 119 }
 120 EXPORT_SYMBOL(ath9k_cmn_count_streams);
 121
 122 void ath9k_cmn_update_txpow(struct ath_hw *ah, u16 cur_txpow,
 123                             u16 new_txpow, u16 *txpower)
 124 {
 125         struct ath_regulatory *reg = ath9k_hw_regulatory(ah);
 126
 127         if (reg->power_limit != new_txpow) {
 128                 ath9k_hw_set_txpowerlimit(ah, new_txpow, false);
 129                 /* read back in case value is clamped */
 130                 *txpower = reg->max_power_level;
 131         }
 132 }
 133 EXPORT_SYMBOL(ath9k_cmn_update_txpow);
 134
 135 void ath9k_cmn_init_crypto(struct ath_hw *ah)
 136 {
 137         struct ath_common *common = ath9k_hw_common(ah);
 138         int i = 0;
 139
 140         /* Get the hardware key cache size. */
 141         common->keymax = AR_KEYTABLE_SIZE;
 142
 143         /*
 144          * Check whether the separate key cache entries
 145          * are required to handle both tx+rx MIC keys.
 146          * With split mic keys the number of stations is limited
 147          * to 27 otherwise 59.
 148          */
 149         if (ah->misc_mode & AR_PCU_MIC_NEW_LOC_ENA)
 150                 common->crypt_caps |= ATH_CRYPT_CAP_MIC_COMBINED;
 151
 152         /*
 153          * Reset the key cache since some parts do not
 154          * reset the contents on initial power up.
 155          */
 156         for (i = 0; i < common->keymax; i++)
 157                 ath_hw_keyreset(common, (u16) i);
 158 }
 159 EXPORT_SYMBOL(ath9k_cmn_init_crypto);
 160
 161 static int __init ath9k_cmn_init(void)
 162 {
 163         return 0;
 164 }
 165 module_init(ath9k_cmn_init);
 166
 167 static void __exit ath9k_cmn_exit(void)
 168 {
 169         return;
 170 }
 171 module_exit(ath9k_cmn_exit);