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);
172