1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3
4 Copyright(c) 2005 Intel Corporation. All rights reserved.
5
6
7 Contact Information:
8 Intel Linux Wireless <ilw@linux.intel.com>
9 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
10
11******************************************************************************/
12#include <linux/compiler.h>
13#include <linux/errno.h>
14#include <linux/if_arp.h>
15#include <linux/in6.h>
16#include <linux/in.h>
17#include <linux/ip.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/netdevice.h>
21#include <linux/proc_fs.h>
22#include <linux/skbuff.h>
23#include <linux/tcp.h>
24#include <linux/types.h>
25#include <linux/wireless.h>
26#include <linux/etherdevice.h>
27#include <linux/uaccess.h>
28
29#include "libipw.h"
30
31int libipw_is_valid_channel(struct libipw_device *ieee, u8 channel)
32{
33 int i;
34
35 /* Driver needs to initialize the geography map before using
36 * these helper functions */
37 if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
38 return 0;
39
40 if (ieee->freq_band & LIBIPW_24GHZ_BAND)
41 for (i = 0; i < ieee->geo.bg_channels; i++)
42 /* NOTE: If G mode is currently supported but
43 * this is a B only channel, we don't see it
44 * as valid. */
45 if ((ieee->geo.bg[i].channel == channel) &&
46 !(ieee->geo.bg[i].flags & LIBIPW_CH_INVALID) &&
47 (!(ieee->mode & IEEE_G) ||
48 !(ieee->geo.bg[i].flags & LIBIPW_CH_B_ONLY)))
49 return LIBIPW_24GHZ_BAND;
50
51 if (ieee->freq_band & LIBIPW_52GHZ_BAND)
52 for (i = 0; i < ieee->geo.a_channels; i++)
53 if ((ieee->geo.a[i].channel == channel) &&
54 !(ieee->geo.a[i].flags & LIBIPW_CH_INVALID))
55 return LIBIPW_52GHZ_BAND;
56
57 return 0;
58}
59
60int libipw_channel_to_index(struct libipw_device *ieee, u8 channel)
61{
62 int i;
63
64 /* Driver needs to initialize the geography map before using
65 * these helper functions */
66 if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
67 return -1;
68
69 if (ieee->freq_band & LIBIPW_24GHZ_BAND)
70 for (i = 0; i < ieee->geo.bg_channels; i++)
71 if (ieee->geo.bg[i].channel == channel)
72 return i;
73
74 if (ieee->freq_band & LIBIPW_52GHZ_BAND)
75 for (i = 0; i < ieee->geo.a_channels; i++)
76 if (ieee->geo.a[i].channel == channel)
77 return i;
78
79 return -1;
80}
81
82u32 libipw_channel_to_freq(struct libipw_device * ieee, u8 channel)
83{
84 const struct libipw_channel * ch;
85
86 /* Driver needs to initialize the geography map before using
87 * these helper functions */
88 if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
89 return 0;
90
91 ch = libipw_get_channel(ieee, channel);
92 if (!ch->channel)
93 return 0;
94 return ch->freq;
95}
96
97u8 libipw_freq_to_channel(struct libipw_device * ieee, u32 freq)
98{
99 int i;
100
101 /* Driver needs to initialize the geography map before using
102 * these helper functions */
103 if (ieee->geo.bg_channels == 0 && ieee->geo.a_channels == 0)
104 return 0;
105
106 freq /= 100000;
107
108 if (ieee->freq_band & LIBIPW_24GHZ_BAND)
109 for (i = 0; i < ieee->geo.bg_channels; i++)
110 if (ieee->geo.bg[i].freq == freq)
111 return ieee->geo.bg[i].channel;
112
113 if (ieee->freq_band & LIBIPW_52GHZ_BAND)
114 for (i = 0; i < ieee->geo.a_channels; i++)
115 if (ieee->geo.a[i].freq == freq)
116 return ieee->geo.a[i].channel;
117
118 return 0;
119}
120
121void libipw_set_geo(struct libipw_device *ieee,
122 const struct libipw_geo *geo)
123{
124 memcpy(ieee->geo.name, geo->name, 3);
125 ieee->geo.name[3] = '\0';
126 ieee->geo.bg_channels = geo->bg_channels;
127 ieee->geo.a_channels = geo->a_channels;
128 memcpy(ieee->geo.bg, geo->bg, geo->bg_channels *
129 sizeof(struct libipw_channel));
130 memcpy(ieee->geo.a, geo->a, ieee->geo.a_channels *
131 sizeof(struct libipw_channel));
132}
133
134const struct libipw_geo *libipw_get_geo(struct libipw_device *ieee)
135{
136 return &ieee->geo;
137}
138
139u8 libipw_get_channel_flags(struct libipw_device * ieee, u8 channel)
140{
141 int index = libipw_channel_to_index(ieee, channel);
142
143 if (index == -1)
144 return LIBIPW_CH_INVALID;
145
146 if (channel <= LIBIPW_24GHZ_CHANNELS)
147 return ieee->geo.bg[index].flags;
148
149 return ieee->geo.a[index].flags;
150}
151
152static const struct libipw_channel bad_channel = {
153 .channel = 0,
154 .flags = LIBIPW_CH_INVALID,
155 .max_power = 0,
156};
157
158const struct libipw_channel *libipw_get_channel(struct libipw_device
159 *ieee, u8 channel)
160{
161 int index = libipw_channel_to_index(ieee, channel);
162
163 if (index == -1)
164 return &bad_channel;
165
166 if (channel <= LIBIPW_24GHZ_CHANNELS)
167 return &ieee->geo.bg[index];
168
169 return &ieee->geo.a[index];
170}
171
172EXPORT_SYMBOL(libipw_get_channel);
173EXPORT_SYMBOL(libipw_get_channel_flags);
174EXPORT_SYMBOL(libipw_is_valid_channel);
175EXPORT_SYMBOL(libipw_freq_to_channel);
176EXPORT_SYMBOL(libipw_channel_to_freq);
177EXPORT_SYMBOL(libipw_channel_to_index);
178EXPORT_SYMBOL(libipw_set_geo);
179EXPORT_SYMBOL(libipw_get_geo);
180

source code of linux/drivers/net/wireless/intel/ipw2x00/libipw_geo.c