]> Pileus Git - ~andy/linux/blob - drivers/net/wireless/ath/ath9k/common.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
[~andy/linux] / 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);