1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
|
/*
* Copyright (c) 2012 Neratec Solutions AG
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/slab.h>
#include <linux/export.h>
#include "dfs_pattern_detector.h"
#include "dfs_pri_detector.h"
#include "ath.h"
/**
* struct radar_types - contains array of patterns defined for one DFS domain
* @domain: DFS regulatory domain
* @num_radar_types: number of radar types to follow
* @radar_types: radar types array
*/
struct radar_types {
enum nl80211_dfs_regions region;
u32 num_radar_types;
const struct radar_detector_specs *radar_types;
};
/* percentage on ppb threshold to trigger detection */
#define MIN_PPB_THRESH 50
#define PPB_THRESH_RATE(PPB, RATE) ((PPB * RATE + 100 - RATE) / 100)
#define PPB_THRESH(PPB) PPB_THRESH_RATE(PPB, MIN_PPB_THRESH)
#define PRF2PRI(PRF) ((1000000 + PRF / 2) / PRF)
/* percentage of pulse width tolerance */
#define WIDTH_TOLERANCE 5
#define WIDTH_LOWER(X) ((X*(100-WIDTH_TOLERANCE)+50)/100)
#define WIDTH_UPPER(X) ((X*(100+WIDTH_TOLERANCE)+50)/100)
#define ETSI_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, CHIRP) \
{ \
ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX), \
(PRF2PRI(PMAX) - PRI_TOLERANCE), \
(PRF2PRI(PMIN) * PRF + PRI_TOLERANCE), PRF, PPB * PRF, \
PPB_THRESH(PPB), PRI_TOLERANCE, CHIRP \
}
/* radar types as defined by ETSI EN-301-893 v1.5.1 */
static const struct radar_detector_specs etsi_radar_ref_types_v15[] = {
ETSI_PATTERN(0, 0, 1, 700, 700, 1, 18, false),
ETSI_PATTERN(1, 0, 5, 200, 1000, 1, 10, false),
ETSI_PATTERN(2, 0, 15, 200, 1600, 1, 15, false),
ETSI_PATTERN(3, 0, 15, 2300, 4000, 1, 25, false),
ETSI_PATTERN(4, 20, 30, 2000, 4000, 1, 20, false),
ETSI_PATTERN(5, 0, 2, 300, 400, 3, 10, false),
ETSI_PATTERN(6, 0, 2, 400, 1200, 3, 15, false),
};
static const struct radar_types etsi_radar_types_v15 = {
.region = NL80211_DFS_ETSI,
.num_radar_types = ARRAY_SIZE(etsi_radar_ref_types_v15),
.radar_types = etsi_radar_ref_types_v15,
};
#define FCC_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, CHIRP) \
{ \
ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX), \
PMIN - PRI_TOLERANCE, \
PMAX * PRF + PRI_TOLERANCE, PRF, PPB * PRF, \
PPB_THRESH(PPB), PRI_TOLERANCE, CHIRP \
}
/* radar types released on August 14, 2014
* type 1 PRI values randomly selected within the range of 518 and 3066.
* divide it to 3 groups is good enough for both of radar detection and
* avoiding false detection based on practical test results
* collected for more than a year.
*/
static const struct radar_detector_specs fcc_radar_ref_types[] = {
FCC_PATTERN(0, 0, 1, 1428, 1428, 1, 18, false),
FCC_PATTERN(101, 0, 1, 518, 938, 1, 57, false),
FCC_PATTERN(102, 0, 1, 938, 2000, 1, 27, false),
FCC_PATTERN(103, 0, 1, 2000, 3066, 1, 18, false),
FCC_PATTERN(2, 0, 5, 150, 230, 1, 23, false),
FCC_PATTERN(3, 6, 10, 200, 500, 1, 16, false),
FCC_PATTERN(4, 11, 20, 200, 500, 1, 12, false),
FCC_PATTERN(5, 50, 100, 1000, 2000, 1, 1, true),
FCC_PATTERN(6, 0, 1, 333, 333, 1, 9, false),
};
static const struct radar_types fcc_radar_types = {
.region = NL80211_DFS_FCC,
.num_radar_types = ARRAY_SIZE(fcc_radar_ref_types),
.radar_types = fcc_radar_ref_types,
};
#define JP_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, RATE, CHIRP) \
{ \
ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX), \
PMIN - PRI_TOLERANCE, \
PMAX * PRF + PRI_TOLERANCE, PRF, PPB * PRF, \
PPB_THRESH_RATE(PPB, RATE), PRI_TOLERANCE, CHIRP \
}
static const struct radar_detector_specs jp_radar_ref_types[] = {
JP_PATTERN(0, 0, 1, 1428, 1428, 1, 18, 29, false),
JP_PATTERN(1, 2, 3, 3846, 3846, 1, 18, 29, false),
JP_PATTERN(2, 0, 1, 1388, 1388, 1, 18, 50, false),
JP_PATTERN(3, 1, 2, 4000, 4000, 1, 18, 50, false),
JP_PATTERN(4, 0, 5, 150, 230, 1, 23, 50, false),
JP_PATTERN(5, 6, 10, 200, 500, 1, 16, 50, false),
JP_PATTERN(6, 11, 20, 200, 500, 1, 12, 50, false),
JP_PATTERN(7, 50, 100, 1000, 2000, 1, 3, 50, false),
JP_PATTERN(5, 0, 1, 333, 333, 1, 9, 50, false),
};
static const struct radar_types jp_radar_types = {
.region = NL80211_DFS_JP,
.num_radar_types = ARRAY_SIZE(jp_radar_ref_types),
.radar_types = jp_radar_ref_types,
};
static const struct radar_types *dfs_domains[] = {
&etsi_radar_types_v15,
&fcc_radar_types,
&jp_radar_types,
};
/**
* get_dfs_domain_radar_types() - get radar types for a given DFS domain
* @param domain DFS domain
* @return radar_types ptr on success, NULL if DFS domain is not supported
*/
static const struct radar_types *
get_dfs_domain_radar_types(enum nl80211_dfs_regions region)
{
u32 i;
for (i = 0; i < ARRAY_SIZE(dfs_domains); i++) {
if (dfs_domains[i]->region == region)
return dfs_domains[i];
}
return NULL;
}
/**
* struct channel_detector - detector elements for a DFS channel
* @head: list_head
* @freq: frequency for this channel detector in MHz
* @detectors: array of dynamically created detector elements for this freq
*
* Channel detectors are required to provide multi-channel DFS detection, e.g.
* to support off-channel scanning. A pattern detector has a list of channels
* radar pulses have been reported for in the past.
*/
struct channel_detector {
struct list_head head;
u16 freq;
struct pri_detector **detectors;
};
/* channel_detector_reset() - reset detector lines for a given channel */
static void channel_detector_reset(struct dfs_pattern_detector *dpd,
struct channel_detector *cd)
{
u32 i;
if (cd == NULL)
return;
for (i = 0; i < dpd->num_radar_types; i++)
cd->detectors[i]->reset(cd->detectors[i], dpd->last_pulse_ts);
}
/* channel_detector_exit() - destructor */
static void channel_detector_exit(struct dfs_pattern_detector *dpd,
struct channel_detector *cd)
{
u32 i;
if (cd == NULL)
return;
list_del(&cd->head);
for (i = 0; i < dpd->num_radar_types; i++) {
struct pri_detector *de = cd->detectors[i];
if (de != NULL)
de->exit(de);
}
kfree(cd->detectors);
kfree(cd);
}
static struct channel_detector *
channel_detector_create(struct dfs_pattern_detector *dpd, u16 freq)
{
u32 sz, i;
struct channel_detector *cd;
cd = kmalloc(sizeof(*cd), GFP_ATOMIC);
if (cd == NULL)
goto fail;
INIT_LIST_HEAD(&cd->head);
cd->freq = freq;
sz = sizeof(cd->detectors) * dpd->num_radar_types;
cd->detectors = kzalloc(sz, GFP_ATOMIC);
if (cd->detectors == NULL)
goto fail;
for (i = 0; i < dpd->num_radar_types; i++) {
const struct radar_detector_specs *rs = &dpd->radar_spec[i];
struct pri_detector *de = pri_detector_init(rs);
if (de == NULL)
goto fail;
cd->detectors[i] = de;
}
list_add(&cd->head, &dpd->channel_detectors);
return cd;
fail:
ath_dbg(dpd->common, DFS,
"failed to allocate channel_detector for freq=%d\n", freq);
channel_detector_exit(dpd,
|