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-rw-r--r--net/ieee80211/ieee80211_geo.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/net/ieee80211/ieee80211_geo.c b/net/ieee80211/ieee80211_geo.c
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1/******************************************************************************
2
3 Copyright(c) 2005 Intel Corporation. All rights reserved.
4
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of version 2 of the GNU General Public License as
7 published by the Free Software Foundation.
8
9 This program is distributed in the hope that it will be useful, but WITHOUT
10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 more details.
13
14 You should have received a copy of the GNU General Public License along with
15 this program; if not, write to the Free Software Foundation, Inc., 59
16 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17
18 The full GNU General Public License is included in this distribution in the
19 file called LICENSE.
20
21 Contact Information:
22 James P. Ketrenos <ipw2100-admin@linux.intel.com>
23 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24
25******************************************************************************/
26#include <linux/compiler.h>
27#include <linux/config.h>
28#include <linux/errno.h>
29#include <linux/if_arp.h>
30#include <linux/in6.h>
31#include <linux/in.h>
32#include <linux/ip.h>
33#include <linux/kernel.h>
34#include <linux/module.h>
35#include <linux/netdevice.h>
36#include <linux/proc_fs.h>
37#include <linux/skbuff.h>
38#include <linux/slab.h>
39#include <linux/tcp.h>
40#include <linux/types.h>
41#include <linux/version.h>
42#include <linux/wireless.h>
43#include <linux/etherdevice.h>
44#include <asm/uaccess.h>
45
46#include <net/ieee80211.h>
47
48int ieee80211_is_valid_channel(struct ieee80211_device *ieee, u8 channel)
49{
50 int i;
51
52 /* Driver needs to initialize the geography map before using
53 * these helper functions */
54 BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
55
56 if (ieee->freq_band & IEEE80211_24GHZ_BAND)
57 for (i = 0; i < ieee->geo.bg_channels; i++)
58 /* NOTE: If G mode is currently supported but
59 * this is a B only channel, we don't see it
60 * as valid. */
61 if ((ieee->geo.bg[i].channel == channel) &&
62 (!(ieee->mode & IEEE_G) ||
63 !(ieee->geo.bg[i].flags & IEEE80211_CH_B_ONLY)))
64 return IEEE80211_24GHZ_BAND;
65
66 if (ieee->freq_band & IEEE80211_52GHZ_BAND)
67 for (i = 0; i < ieee->geo.a_channels; i++)
68 if (ieee->geo.a[i].channel == channel)
69 return IEEE80211_52GHZ_BAND;
70
71 return 0;
72}
73
74int ieee80211_channel_to_index(struct ieee80211_device *ieee, u8 channel)
75{
76 int i;
77
78 /* Driver needs to initialize the geography map before using
79 * these helper functions */
80 BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
81
82 if (ieee->freq_band & IEEE80211_24GHZ_BAND)
83 for (i = 0; i < ieee->geo.bg_channels; i++)
84 if (ieee->geo.bg[i].channel == channel)
85 return i;
86
87 if (ieee->freq_band & IEEE80211_52GHZ_BAND)
88 for (i = 0; i < ieee->geo.a_channels; i++)
89 if (ieee->geo.a[i].channel == channel)
90 return i;
91
92 return -1;
93}
94
95u8 ieee80211_freq_to_channel(struct ieee80211_device * ieee, u32 freq)
96{
97 int i;
98
99 /* Driver needs to initialize the geography map before using
100 * these helper functions */
101 BUG_ON(ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0);
102
103 freq /= 100000;
104
105 if (ieee->freq_band & IEEE80211_24GHZ_BAND)
106 for (i = 0; i < ieee->geo.bg_channels; i++)
107 if (ieee->geo.bg[i].freq == freq)
108 return ieee->geo.bg[i].channel;
109
110 if (ieee->freq_band & IEEE80211_52GHZ_BAND)
111 for (i = 0; i < ieee->geo.a_channels; i++)
112 if (ieee->geo.a[i].freq == freq)
113 return ieee->geo.a[i].channel;
114
115 return 0;
116}
117
118int ieee80211_set_geo(struct ieee80211_device *ieee,
119 const struct ieee80211_geo *geo)
120{
121 memcpy(ieee->geo.name, geo->name, 3);
122 ieee->geo.name[3] = '\0';
123 ieee->geo.bg_channels = geo->bg_channels;
124 ieee->geo.a_channels = geo->a_channels;
125 memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
126 sizeof(struct ieee80211_channel));
127 memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
128 sizeof(struct ieee80211_channel));
129 return 0;
130}
131
132const struct ieee80211_geo *ieee80211_get_geo(struct ieee80211_device *ieee)
133{
134 return &ieee->geo;
135}
136
137EXPORT_SYMBOL(ieee80211_is_valid_channel);
138EXPORT_SYMBOL(ieee80211_freq_to_channel);
139EXPORT_SYMBOL(ieee80211_channel_to_index);
140EXPORT_SYMBOL(ieee80211_set_geo);
141EXPORT_SYMBOL(ieee80211_get_geo);