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 cfg80211_chan_def *chandef)
  53 {
  54         u32 chanmode = 0;
  55
  56         switch (chandef->chan->band) {
  57         case IEEE80211_BAND_2GHZ:
  58                 switch (chandef->width) {
  59                 case NL80211_CHAN_WIDTH_20_NOHT:
  60                 case NL80211_CHAN_WIDTH_20:
  61                         chanmode = CHANNEL_G_HT20;
  62                         break;
  63                 case NL80211_CHAN_WIDTH_40:
  64                         if (chandef->center_freq1 > chandef->chan->center_freq)
  65                                 chanmode = CHANNEL_G_HT40PLUS;
  66                         else
  67                                 chanmode = CHANNEL_G_HT40MINUS;
  68                         break;
  69                 default:
  70                         break;
  71                 }
  72                 break;
  73         case IEEE80211_BAND_5GHZ:
  74                 switch (chandef->width) {
  75                 case NL80211_CHAN_WIDTH_20_NOHT:
  76                 case NL80211_CHAN_WIDTH_20:
  77                         chanmode = CHANNEL_A_HT20;
  78                         break;
  79                 case NL80211_CHAN_WIDTH_40:
  80                         if (chandef->center_freq1 > chandef->chan->center_freq)
  81                                 chanmode = CHANNEL_A_HT40PLUS;
  82                         else
  83                                 chanmode = CHANNEL_A_HT40MINUS;
  84                         break;
  85                 default:
  86                         break;
  87                 }
  88                 break;
  89         default:
  90                 break;
  91         }
  92
  93         return chanmode;
  94 }
  95
  96 /*
  97  * Update internal channel flags.
  98  */
  99 void ath9k_cmn_update_ichannel(struct ath9k_channel *ichan,
 100                                struct cfg80211_chan_def *chandef)
 101 {
 102         ichan->channel = chandef->chan->center_freq;
 103         ichan->chan = chandef->chan;
 104
 105         if (chandef->chan->band == IEEE80211_BAND_2GHZ) {
 106                 ichan->chanmode = CHANNEL_G;
 107                 ichan->channelFlags = CHANNEL_2GHZ | CHANNEL_OFDM;
 108         } else {
 109                 ichan->chanmode = CHANNEL_A;
 110                 ichan->channelFlags = CHANNEL_5GHZ | CHANNEL_OFDM;
 111         }
 112
 113         switch (chandef->width) {
 114         case NL80211_CHAN_WIDTH_5:
 115                 ichan->channelFlags |= CHANNEL_QUARTER;
 116                 break;
 117         case NL80211_CHAN_WIDTH_10:
 118                 ichan->channelFlags |= CHANNEL_HALF;
 119                 break;
 120         case NL80211_CHAN_WIDTH_20_NOHT:
 121                 break;
 122         case NL80211_CHAN_WIDTH_20:
 123         case NL80211_CHAN_WIDTH_40:
 124                 ichan->chanmode = ath9k_get_extchanmode(chandef);
 125                 break;
 126         default:
 127                 WARN_ON(1);
 128         }
 129 }
 130 EXPORT_SYMBOL(ath9k_cmn_update_ichannel);
 131
 132 /*
 133  * Get the internal channel reference.
 134  */
 135 struct ath9k_channel *ath9k_cmn_get_curchannel(struct ieee80211_hw *hw,
 136                                                struct ath_hw *ah)
 137 {
 138         struct ieee80211_channel *curchan = hw->conf.chandef.chan;
 139         struct ath9k_channel *channel;
 140         u8 chan_idx;
 141
 142         chan_idx = curchan->hw_value;
 143         channel = &ah->channels[chan_idx];
 144         ath9k_cmn_update_ichannel(channel, &hw->conf.chandef);
 145
 146         return channel;
 147 }
 148 EXPORT_SYMBOL(ath9k_cmn_get_curchannel);
 149
 150 int ath9k_cmn_count_streams(unsigned int chainmask, int max)
 151 {
 152         int streams = 0;
 153
 154         do {
 155                 if (++streams == max)
 156                         break;
 157         } while ((chainmask = chainmask & (chainmask - 1)));
 158
 159         return streams;
 160 }
 161 EXPORT_SYMBOL(ath9k_cmn_count_streams);
 162
 163 void ath9k_cmn_update_txpow(struct ath_hw *ah, u16 cur_txpow,
 164                             u16 new_txpow, u16 *txpower)
 165 {
 166         struct ath_regulatory *reg = ath9k_hw_regulatory(ah);
 167
 168         if (reg->power_limit != new_txpow) {
 169                 ath9k_hw_set_txpowerlimit(ah, new_txpow, false);
 170                 /* read back in case value is clamped */
 171                 *txpower = reg->max_power_level;
 172         }
 173 }
 174 EXPORT_SYMBOL(ath9k_cmn_update_txpow);
 175
 176 void ath9k_cmn_init_crypto(struct ath_hw *ah)
 177 {
 178         struct ath_common *common = ath9k_hw_common(ah);
 179         int i = 0;
 180
 181         /* Get the hardware key cache size. */
 182         common->keymax = AR_KEYTABLE_SIZE;
 183
 184         /*
 185          * Check whether the separate key cache entries
 186          * are required to handle both tx+rx MIC keys.
 187          * With split mic keys the number of stations is limited
 188          * to 27 otherwise 59.
 189          */
 190         if (ah->misc_mode & AR_PCU_MIC_NEW_LOC_ENA)
 191                 common->crypt_caps |= ATH_CRYPT_CAP_MIC_COMBINED;
 192
 193         /*
 194          * Reset the key cache since some parts do not
 195          * reset the contents on initial power up.
 196          */
 197         for (i = 0; i < common->keymax; i++)
 198                 ath_hw_keyreset(common, (u16) i);
 199 }
 200 EXPORT_SYMBOL(ath9k_cmn_init_crypto);
 201
 202 static int __init ath9k_cmn_init(void)
 203 {
 204         return 0;
 205 }
 206 module_init(ath9k_cmn_init);
 207
 208 static void __exit ath9k_cmn_exit(void)
 209 {
 210         return;
 211 }
 212 module_exit(ath9k_cmn_exit);