Merge mac80211 driver from tree at bu3sch.de, pulled 24/6
[openwrt/openwrt.git] / package / mac80211 / src / mac80211 / regdomain.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10 /*
11 * This regulatory domain control implementation is known to be incomplete
12 * and confusing. mac80211 regulatory domain control will be significantly
13 * reworked in the not-too-distant future.
14 *
15 * For now, drivers wishing to control which channels are and aren't available
16 * are advised as follows:
17 * - set the IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED flag
18 * - continue to include *ALL* possible channels in the modes registered
19 * through ieee80211_register_hwmode()
20 * - for each allowable ieee80211_channel structure registered in the above
21 * call, set the flag member to some meaningful value such as
22 * IEEE80211_CHAN_W_SCAN | IEEE80211_CHAN_W_ACTIVE_SCAN |
23 * IEEE80211_CHAN_W_IBSS.
24 * - leave flag as 0 for non-allowable channels
25 *
26 * The usual implementation is for a driver to read a device EEPROM to
27 * determine which regulatory domain it should be operating under, then
28 * looking up the allowable channels in a driver-local table, then performing
29 * the above.
30 */
31
32 #include <linux/module.h>
33 #include <linux/netdevice.h>
34 #include <net/mac80211.h>
35
36 static int ieee80211_regdom = 0x10; /* FCC */
37 module_param(ieee80211_regdom, int, 0444);
38 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain; 64=MKK");
39
40 /*
41 * If firmware is upgraded by the vendor, additional channels can be used based
42 * on the new Japanese regulatory rules. This is indicated by setting
43 * ieee80211_japan_5ghz module parameter to one when loading the 80211 kernel
44 * module.
45 */
46 static int ieee80211_japan_5ghz /* = 0 */;
47 module_param(ieee80211_japan_5ghz, int, 0444);
48 MODULE_PARM_DESC(ieee80211_japan_5ghz, "Vendor-updated firmware for 5 GHz");
49
50
51 struct ieee80211_channel_range {
52 short start_freq;
53 short end_freq;
54 unsigned char power_level;
55 unsigned char antenna_max;
56 };
57
58 static const struct ieee80211_channel_range ieee80211_fcc_channels[] = {
59 { 2412, 2462, 27, 6 } /* IEEE 802.11b/g, channels 1..11 */,
60 { 5180, 5240, 17, 6 } /* IEEE 802.11a, channels 36..48 */,
61 { 5260, 5320, 23, 6 } /* IEEE 802.11a, channels 52..64 */,
62 { 5745, 5825, 30, 6 } /* IEEE 802.11a, channels 149..165, outdoor */,
63 { 0 }
64 };
65
66 static const struct ieee80211_channel_range ieee80211_mkk_channels[] = {
67 { 2412, 2472, 20, 6 } /* IEEE 802.11b/g, channels 1..13 */,
68 { 5170, 5240, 20, 6 } /* IEEE 802.11a, channels 34..48 */,
69 { 5260, 5320, 20, 6 } /* IEEE 802.11a, channels 52..64 */,
70 { 0 }
71 };
72
73
74 static const struct ieee80211_channel_range *channel_range =
75 ieee80211_fcc_channels;
76
77
78 static void ieee80211_unmask_channel(int mode, struct ieee80211_channel *chan)
79 {
80 int i;
81
82 chan->flag = 0;
83
84 if (ieee80211_regdom == 64 &&
85 (mode == MODE_ATHEROS_TURBO || mode == MODE_ATHEROS_TURBOG)) {
86 /* Do not allow Turbo modes in Japan. */
87 return;
88 }
89
90 for (i = 0; channel_range[i].start_freq; i++) {
91 const struct ieee80211_channel_range *r = &channel_range[i];
92 if (r->start_freq <= chan->freq && r->end_freq >= chan->freq) {
93 if (ieee80211_regdom == 64 && !ieee80211_japan_5ghz &&
94 chan->freq >= 5260 && chan->freq <= 5320) {
95 /*
96 * Skip new channels in Japan since the
97 * firmware was not marked having been upgraded
98 * by the vendor.
99 */
100 continue;
101 }
102
103 if (ieee80211_regdom == 0x10 &&
104 (chan->freq == 5190 || chan->freq == 5210 ||
105 chan->freq == 5230)) {
106 /* Skip MKK channels when in FCC domain. */
107 continue;
108 }
109
110 chan->flag |= IEEE80211_CHAN_W_SCAN |
111 IEEE80211_CHAN_W_ACTIVE_SCAN |
112 IEEE80211_CHAN_W_IBSS;
113 chan->power_level = r->power_level;
114 chan->antenna_max = r->antenna_max;
115
116 if (ieee80211_regdom == 64 &&
117 (chan->freq == 5170 || chan->freq == 5190 ||
118 chan->freq == 5210 || chan->freq == 5230)) {
119 /*
120 * New regulatory rules in Japan have backwards
121 * compatibility with old channels in 5.15-5.25
122 * GHz band, but the station is not allowed to
123 * use active scan on these old channels.
124 */
125 chan->flag &= ~IEEE80211_CHAN_W_ACTIVE_SCAN;
126 }
127
128 if (ieee80211_regdom == 64 &&
129 (chan->freq == 5260 || chan->freq == 5280 ||
130 chan->freq == 5300 || chan->freq == 5320)) {
131 /*
132 * IBSS is not allowed on 5.25-5.35 GHz band
133 * due to radar detection requirements.
134 */
135 chan->flag &= ~IEEE80211_CHAN_W_IBSS;
136 }
137
138 break;
139 }
140 }
141 }
142
143
144 void ieee80211_set_default_regdomain(struct ieee80211_hw_mode *mode)
145 {
146 int c;
147 for (c = 0; c < mode->num_channels; c++)
148 ieee80211_unmask_channel(mode->mode, &mode->channels[c]);
149 }
150
151
152 void ieee80211_regdomain_init(void)
153 {
154 if (ieee80211_regdom == 0x40)
155 channel_range = ieee80211_mkk_channels;
156 }
157