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1/*
2 * Copyright (c) 2012 Neratec Solutions AG
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#include <linux/slab.h>
18#include <linux/export.h>
19
20#include "dfs_pattern_detector.h"
21#include "dfs_pri_detector.h"
22#include "ath.h"
23
24/**
25 * struct radar_types - contains array of patterns defined for one DFS domain
26 * @domain: DFS regulatory domain
27 * @num_radar_types: number of radar types to follow
28 * @radar_types: radar types array
29 */
30struct radar_types {
31 enum nl80211_dfs_regions region;
32 u32 num_radar_types;
33 const struct radar_detector_specs *radar_types;
34};
35
36/* percentage on ppb threshold to trigger detection */
37#define MIN_PPB_THRESH 50
38#define PPB_THRESH_RATE(PPB, RATE) ((PPB * RATE + 100 - RATE) / 100)
39#define PPB_THRESH(PPB) PPB_THRESH_RATE(PPB, MIN_PPB_THRESH)
40#define PRF2PRI(PRF) ((1000000 + PRF / 2) / PRF)
41/* percentage of pulse width tolerance */
42#define WIDTH_TOLERANCE 5
43#define WIDTH_LOWER(X) ((X*(100-WIDTH_TOLERANCE)+50)/100)
44#define WIDTH_UPPER(X) ((X*(100+WIDTH_TOLERANCE)+50)/100)
45
46#define ETSI_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, CHIRP) \
47{ \
48 ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX), \
49 (PRF2PRI(PMAX) - PRI_TOLERANCE), \
50 (PRF2PRI(PMIN) * PRF + PRI_TOLERANCE), PRF, PPB * PRF, \
51 PPB_THRESH(PPB), PRI_TOLERANCE, CHIRP \
52}
53
54/* radar types as defined by ETSI EN-301-893 v1.5.1 */
55static const struct radar_detector_specs etsi_radar_ref_types_v15[] = {
56 ETSI_PATTERN(0, 0, 1, 700, 700, 1, 18, false),
57 ETSI_PATTERN(1, 0, 5, 200, 1000, 1, 10, false),
58 ETSI_PATTERN(2, 0, 15, 200, 1600, 1, 15, false),
59 ETSI_PATTERN(3, 0, 15, 2300, 4000, 1, 25, false),
60 ETSI_PATTERN(4, 20, 30, 2000, 4000, 1, 20, false),
61 ETSI_PATTERN(5, 0, 2, 300, 400, 3, 10, false),
62 ETSI_PATTERN(6, 0, 2, 400, 1200, 3, 15, false),
63};
64
65static const struct radar_types etsi_radar_types_v15 = {
66 .region = NL80211_DFS_ETSI,
67 .num_radar_types = ARRAY_SIZE(etsi_radar_ref_types_v15),
68 .radar_types = etsi_radar_ref_types_v15,
69};
70
71#define FCC_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, CHIRP) \
72{ \
73 ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX), \
74 PMIN - PRI_TOLERANCE, \
75 PMAX * PRF + PRI_TOLERANCE, PRF, PPB * PRF, \
76 PPB_THRESH(PPB), PRI_TOLERANCE, CHIRP \
77}
78
79/* radar types released on August 14, 2014
80 * type 1 PRI values randomly selected within the range of 518 and 3066.
81 * divide it to 3 groups is good enough for both of radar detection and
82 * avoiding false detection based on practical test results
83 * collected for more than a year.
84 */
85static const struct radar_detector_specs fcc_radar_ref_types[] = {
86 FCC_PATTERN(0, 0, 1, 1428, 1428, 1, 18, false),
87 FCC_PATTERN(101, 0, 1, 518, 938, 1, 57, false),
88 FCC_PATTERN(102, 0, 1, 938, 2000, 1, 27, false),
89 FCC_PATTERN(103, 0, 1, 2000, 3066, 1, 18, false),
90 FCC_PATTERN(2, 0, 5, 150, 230, 1, 23, false),
91 FCC_PATTERN(3, 6, 10, 200, 500, 1, 16, false),
92 FCC_PATTERN(4, 11, 20, 200, 500, 1, 12, false),
93 FCC_PATTERN(5, 50, 100, 1000, 2000, 1, 1, true),
94 FCC_PATTERN(6, 0, 1, 333, 333, 1, 9, false),
95};
96
97static const struct radar_types fcc_radar_types = {
98 .region = NL80211_DFS_FCC,
99 .num_radar_types = ARRAY_SIZE(fcc_radar_ref_types),
100 .radar_types = fcc_radar_ref_types,
101};
102
103#define JP_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB, RATE, CHIRP) \
104{ \
105 ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX), \
106 PMIN - PRI_TOLERANCE, \
107 PMAX * PRF + PRI_TOLERANCE, PRF, PPB * PRF, \
108 PPB_THRESH_RATE(PPB, RATE), PRI_TOLERANCE, CHIRP \
109}
110static const struct radar_detector_specs jp_radar_ref_types[] = {
111 JP_PATTERN(0, 0, 1, 1428, 1428, 1, 18, 29, false),
112 JP_PATTERN(1, 2, 3, 3846, 3846, 1, 18, 29, false),
113 JP_PATTERN(2, 0, 1, 1388, 1388, 1, 18, 50, false),
114 JP_PATTERN(3, 1, 2, 4000, 4000, 1, 18, 50, false),
115 JP_PATTERN(4, 0, 5, 150, 230, 1, 23, 50, false),
116 JP_PATTERN(5, 6, 10, 200, 500, 1, 16, 50, false),
117 JP_PATTERN(6, 11, 20, 200, 500, 1, 12, 50, false),
118 JP_PATTERN(7, 50, 100, 1000, 2000, 1, 3, 50, true),
119 JP_PATTERN(5, 0, 1, 333, 333, 1, 9, 50, false),
120};
121
122static const struct radar_types jp_radar_types = {
123 .region = NL80211_DFS_JP,
124 .num_radar_types = ARRAY_SIZE(jp_radar_ref_types),
125 .radar_types = jp_radar_ref_types,
126};
127
128static const struct radar_types *dfs_domains[] = {
129 &etsi_radar_types_v15,
130 &fcc_radar_types,
131 &jp_radar_types,
132};
133
134/**
135 * get_dfs_domain_radar_types() - get radar types for a given DFS domain
136 * @param domain DFS domain
137 * @return radar_types ptr on success, NULL if DFS domain is not supported
138 */
139static const struct radar_types *
140get_dfs_domain_radar_types(enum nl80211_dfs_regions region)
141{
142 u32 i;
143 for (i = 0; i < ARRAY_SIZE(dfs_domains); i++) {
144 if (dfs_domains[i]->region == region)
145 return dfs_domains[i];
146 }
147 return NULL;
148}
149
150/**
151 * struct channel_detector - detector elements for a DFS channel
152 * @head: list_head
153 * @freq: frequency for this channel detector in MHz
154 * @detectors: array of dynamically created detector elements for this freq
155 *
156 * Channel detectors are required to provide multi-channel DFS detection, e.g.
157 * to support off-channel scanning. A pattern detector has a list of channels
158 * radar pulses have been reported for in the past.
159 */
160struct channel_detector {
161 struct list_head head;
162 u16 freq;
163 struct pri_detector **detectors;
164};
165
166/* channel_detector_reset() - reset detector lines for a given channel */
167static void channel_detector_reset(struct dfs_pattern_detector *dpd,
168 struct channel_detector *cd)
169{
170 u32 i;
171 if (cd == NULL)
172 return;
173 for (i = 0; i < dpd->num_radar_types; i++)
174 cd->detectors[i]->reset(cd->detectors[i], dpd->last_pulse_ts);
175}
176
177/* channel_detector_exit() - destructor */
178static void channel_detector_exit(struct dfs_pattern_detector *dpd,
179 struct channel_detector *cd)
180{
181 u32 i;
182 if (cd == NULL)
183 return;
184 list_del(&cd->head);
185 for (i = 0; i < dpd->num_radar_types; i++) {
186 struct pri_detector *de = cd->detectors[i];
187 if (de != NULL)
188 de->exit(de);
189 }
190 kfree(cd->detectors);
191 kfree(cd);
192}
193
194static struct channel_detector *
195channel_detector_create(struct dfs_pattern_detector *dpd, u16 freq)
196{
197 u32 sz, i;
198 struct channel_detector *cd;
199
200 cd = kmalloc(sizeof(*cd), GFP_ATOMIC);
201 if (cd == NULL)
202 goto fail;
203
204 INIT_LIST_HEAD(&cd->head);
205 cd->freq = freq;
206 sz = sizeof(cd->detectors) * dpd->num_radar_types;
207 cd->detectors = kzalloc(sz, GFP_ATOMIC);
208 if (cd->detectors == NULL)
209 goto fail;
210
211 for (i = 0; i < dpd->num_radar_types; i++) {
212 const struct radar_detector_specs *rs = &dpd->radar_spec[i];
213 struct pri_detector *de = pri_detector_init(rs);
214 if (de == NULL)
215 goto fail;
216 cd->detectors[i] = de;
217 }
218 list_add(&cd->head, &dpd->channel_detectors);
219 return cd;
220
221fail:
222 ath_dbg(dpd->common, DFS,
223 "failed to allocate channel_detector for freq=%d\n", freq);
224 channel_detector_exit(dpd, cd);
225 return NULL;
226}
227
228/**
229 * channel_detector_get() - get channel detector for given frequency
230 * @param dpd instance pointer
231 * @param freq frequency in MHz
232 * @return pointer to channel detector on success, NULL otherwise
233 *
234 * Return existing channel detector for the given frequency or return a
235 * newly create one.
236 */
237static struct channel_detector *
238channel_detector_get(struct dfs_pattern_detector *dpd, u16 freq)
239{
240 struct channel_detector *cd;
241 list_for_each_entry(cd, &dpd->channel_detectors, head) {
242 if (cd->freq == freq)
243 return cd;
244 }
245 return channel_detector_create(dpd, freq);
246}
247
248/*
249 * DFS Pattern Detector
250 */
251
252/* dpd_reset(): reset all channel detectors */
253static void dpd_reset(struct dfs_pattern_detector *dpd)
254{
255 struct channel_detector *cd;
256 if (!list_empty(&dpd->channel_detectors))
257 list_for_each_entry(cd, &dpd->channel_detectors, head)
258 channel_detector_reset(dpd, cd);
259
260}
261static void dpd_exit(struct dfs_pattern_detector *dpd)
262{
263 struct channel_detector *cd, *cd0;
264 if (!list_empty(&dpd->channel_detectors))
265 list_for_each_entry_safe(cd, cd0, &dpd->channel_detectors, head)
266 channel_detector_exit(dpd, cd);
267 kfree(dpd);
268}
269
270static bool
271dpd_add_pulse(struct dfs_pattern_detector *dpd, struct pulse_event *event)
272{
273 u32 i;
274 struct channel_detector *cd;
275
276 /*
277 * pulses received for a non-supported or un-initialized
278 * domain are treated as detected radars for fail-safety
279 */
280 if (dpd->region == NL80211_DFS_UNSET)
281 return true;
282
283 cd = channel_detector_get(dpd, event->freq);
284 if (cd == NULL)
285 return false;
286
287 /* reset detector on time stamp wraparound, caused by TSF reset */
288 if (event->ts < dpd->last_pulse_ts)
289 dpd_reset(dpd);
290 dpd->last_pulse_ts = event->ts;
291
292 /* do type individual pattern matching */
293 for (i = 0; i < dpd->num_radar_types; i++) {
294 struct pri_detector *pd = cd->detectors[i];
295 struct pri_sequence *ps = pd->add_pulse(pd, event);
296 if (ps != NULL) {
297 ath_dbg(dpd->common, DFS,
298 "DFS: radar found on freq=%d: id=%d, pri=%d, "
299 "count=%d, count_false=%d\n",
300 event->freq, pd->rs->type_id,
301 ps->pri, ps->count, ps->count_falses);
302 pd->reset(pd, dpd->last_pulse_ts);
303 return true;
304 }
305 }
306 return false;
307}
308
309static struct ath_dfs_pool_stats
310dpd_get_stats(struct dfs_pattern_detector *dpd)
311{
312 return global_dfs_pool_stats;
313}
314
315static bool dpd_set_domain(struct dfs_pattern_detector *dpd,
316 enum nl80211_dfs_regions region)
317{
318 const struct radar_types *rt;
319 struct channel_detector *cd, *cd0;
320
321 if (dpd->region == region)
322 return true;
323
324 dpd->region = NL80211_DFS_UNSET;
325
326 rt = get_dfs_domain_radar_types(region);
327 if (rt == NULL)
328 return false;
329
330 /* delete all channel detectors for previous DFS domain */
331 if (!list_empty(&dpd->channel_detectors))
332 list_for_each_entry_safe(cd, cd0, &dpd->channel_detectors, head)
333 channel_detector_exit(dpd, cd);
334 dpd->radar_spec = rt->radar_types;
335 dpd->num_radar_types = rt->num_radar_types;
336
337 dpd->region = region;
338 return true;
339}
340
341static const struct dfs_pattern_detector default_dpd = {
342 .exit = dpd_exit,
343 .set_dfs_domain = dpd_set_domain,
344 .add_pulse = dpd_add_pulse,
345 .get_stats = dpd_get_stats,
346 .region = NL80211_DFS_UNSET,
347};
348
349struct dfs_pattern_detector *
350dfs_pattern_detector_init(struct ath_common *common,
351 enum nl80211_dfs_regions region)
352{
353 struct dfs_pattern_detector *dpd;
354
355 if (!IS_ENABLED(CONFIG_CFG80211_CERTIFICATION_ONUS))
356 return NULL;
357
358 dpd = kmalloc(sizeof(*dpd), GFP_KERNEL);
359 if (dpd == NULL)
360 return NULL;
361
362 *dpd = default_dpd;
363 INIT_LIST_HEAD(&dpd->channel_detectors);
364
365 dpd->common = common;
366 if (dpd->set_dfs_domain(dpd, region))
367 return dpd;
368
369 ath_dbg(common, DFS,"Could not set DFS domain to %d", region);
370 kfree(dpd);
371 return NULL;
372}
373EXPORT_SYMBOL(dfs_pattern_detector_init);
1/*
2 * Copyright (c) 2012 Neratec Solutions AG
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#include <linux/slab.h>
18#include <linux/export.h>
19
20#include "dfs_pattern_detector.h"
21#include "dfs_pri_detector.h"
22#include "ath.h"
23
24/*
25 * tolerated deviation of radar time stamp in usecs on both sides
26 * TODO: this might need to be HW-dependent
27 */
28#define PRI_TOLERANCE 16
29
30/**
31 * struct radar_types - contains array of patterns defined for one DFS domain
32 * @domain: DFS regulatory domain
33 * @num_radar_types: number of radar types to follow
34 * @radar_types: radar types array
35 */
36struct radar_types {
37 enum nl80211_dfs_regions region;
38 u32 num_radar_types;
39 const struct radar_detector_specs *radar_types;
40};
41
42/* percentage on ppb threshold to trigger detection */
43#define MIN_PPB_THRESH 50
44#define PPB_THRESH(PPB) ((PPB * MIN_PPB_THRESH + 50) / 100)
45#define PRF2PRI(PRF) ((1000000 + PRF / 2) / PRF)
46/* percentage of pulse width tolerance */
47#define WIDTH_TOLERANCE 5
48#define WIDTH_LOWER(X) ((X*(100-WIDTH_TOLERANCE)+50)/100)
49#define WIDTH_UPPER(X) ((X*(100+WIDTH_TOLERANCE)+50)/100)
50
51#define ETSI_PATTERN(ID, WMIN, WMAX, PMIN, PMAX, PRF, PPB) \
52{ \
53 ID, WIDTH_LOWER(WMIN), WIDTH_UPPER(WMAX), \
54 (PRF2PRI(PMAX) - PRI_TOLERANCE), \
55 (PRF2PRI(PMIN) * PRF + PRI_TOLERANCE), PRF, PPB * PRF, \
56 PPB_THRESH(PPB), PRI_TOLERANCE, \
57}
58
59/* radar types as defined by ETSI EN-301-893 v1.5.1 */
60static const struct radar_detector_specs etsi_radar_ref_types_v15[] = {
61 ETSI_PATTERN(0, 0, 1, 700, 700, 1, 18),
62 ETSI_PATTERN(1, 0, 5, 200, 1000, 1, 10),
63 ETSI_PATTERN(2, 0, 15, 200, 1600, 1, 15),
64 ETSI_PATTERN(3, 0, 15, 2300, 4000, 1, 25),
65 ETSI_PATTERN(4, 20, 30, 2000, 4000, 1, 20),
66 ETSI_PATTERN(5, 0, 2, 300, 400, 3, 10),
67 ETSI_PATTERN(6, 0, 2, 400, 1200, 3, 15),
68};
69
70static const struct radar_types etsi_radar_types_v15 = {
71 .region = NL80211_DFS_ETSI,
72 .num_radar_types = ARRAY_SIZE(etsi_radar_ref_types_v15),
73 .radar_types = etsi_radar_ref_types_v15,
74};
75
76/* for now, we support ETSI radar types, FCC and JP are TODO */
77static const struct radar_types *dfs_domains[] = {
78 &etsi_radar_types_v15,
79};
80
81/**
82 * get_dfs_domain_radar_types() - get radar types for a given DFS domain
83 * @param domain DFS domain
84 * @return radar_types ptr on success, NULL if DFS domain is not supported
85 */
86static const struct radar_types *
87get_dfs_domain_radar_types(enum nl80211_dfs_regions region)
88{
89 u32 i;
90 for (i = 0; i < ARRAY_SIZE(dfs_domains); i++) {
91 if (dfs_domains[i]->region == region)
92 return dfs_domains[i];
93 }
94 return NULL;
95}
96
97/**
98 * struct channel_detector - detector elements for a DFS channel
99 * @head: list_head
100 * @freq: frequency for this channel detector in MHz
101 * @detectors: array of dynamically created detector elements for this freq
102 *
103 * Channel detectors are required to provide multi-channel DFS detection, e.g.
104 * to support off-channel scanning. A pattern detector has a list of channels
105 * radar pulses have been reported for in the past.
106 */
107struct channel_detector {
108 struct list_head head;
109 u16 freq;
110 struct pri_detector **detectors;
111};
112
113/* channel_detector_reset() - reset detector lines for a given channel */
114static void channel_detector_reset(struct dfs_pattern_detector *dpd,
115 struct channel_detector *cd)
116{
117 u32 i;
118 if (cd == NULL)
119 return;
120 for (i = 0; i < dpd->num_radar_types; i++)
121 cd->detectors[i]->reset(cd->detectors[i], dpd->last_pulse_ts);
122}
123
124/* channel_detector_exit() - destructor */
125static void channel_detector_exit(struct dfs_pattern_detector *dpd,
126 struct channel_detector *cd)
127{
128 u32 i;
129 if (cd == NULL)
130 return;
131 list_del(&cd->head);
132 for (i = 0; i < dpd->num_radar_types; i++) {
133 struct pri_detector *de = cd->detectors[i];
134 if (de != NULL)
135 de->exit(de);
136 }
137 kfree(cd->detectors);
138 kfree(cd);
139}
140
141static struct channel_detector *
142channel_detector_create(struct dfs_pattern_detector *dpd, u16 freq)
143{
144 u32 sz, i;
145 struct channel_detector *cd;
146
147 cd = kmalloc(sizeof(*cd), GFP_ATOMIC);
148 if (cd == NULL)
149 goto fail;
150
151 INIT_LIST_HEAD(&cd->head);
152 cd->freq = freq;
153 sz = sizeof(cd->detectors) * dpd->num_radar_types;
154 cd->detectors = kzalloc(sz, GFP_ATOMIC);
155 if (cd->detectors == NULL)
156 goto fail;
157
158 for (i = 0; i < dpd->num_radar_types; i++) {
159 const struct radar_detector_specs *rs = &dpd->radar_spec[i];
160 struct pri_detector *de = pri_detector_init(rs);
161 if (de == NULL)
162 goto fail;
163 cd->detectors[i] = de;
164 }
165 list_add(&cd->head, &dpd->channel_detectors);
166 return cd;
167
168fail:
169 ath_dbg(dpd->common, DFS,
170 "failed to allocate channel_detector for freq=%d\n", freq);
171 channel_detector_exit(dpd, cd);
172 return NULL;
173}
174
175/**
176 * channel_detector_get() - get channel detector for given frequency
177 * @param dpd instance pointer
178 * @param freq frequency in MHz
179 * @return pointer to channel detector on success, NULL otherwise
180 *
181 * Return existing channel detector for the given frequency or return a
182 * newly create one.
183 */
184static struct channel_detector *
185channel_detector_get(struct dfs_pattern_detector *dpd, u16 freq)
186{
187 struct channel_detector *cd;
188 list_for_each_entry(cd, &dpd->channel_detectors, head) {
189 if (cd->freq == freq)
190 return cd;
191 }
192 return channel_detector_create(dpd, freq);
193}
194
195/*
196 * DFS Pattern Detector
197 */
198
199/* dpd_reset(): reset all channel detectors */
200static void dpd_reset(struct dfs_pattern_detector *dpd)
201{
202 struct channel_detector *cd;
203 if (!list_empty(&dpd->channel_detectors))
204 list_for_each_entry(cd, &dpd->channel_detectors, head)
205 channel_detector_reset(dpd, cd);
206
207}
208static void dpd_exit(struct dfs_pattern_detector *dpd)
209{
210 struct channel_detector *cd, *cd0;
211 if (!list_empty(&dpd->channel_detectors))
212 list_for_each_entry_safe(cd, cd0, &dpd->channel_detectors, head)
213 channel_detector_exit(dpd, cd);
214 kfree(dpd);
215}
216
217static bool
218dpd_add_pulse(struct dfs_pattern_detector *dpd, struct pulse_event *event)
219{
220 u32 i;
221 struct channel_detector *cd;
222
223 /*
224 * pulses received for a non-supported or un-initialized
225 * domain are treated as detected radars for fail-safety
226 */
227 if (dpd->region == NL80211_DFS_UNSET)
228 return true;
229
230 cd = channel_detector_get(dpd, event->freq);
231 if (cd == NULL)
232 return false;
233
234 dpd->last_pulse_ts = event->ts;
235 /* reset detector on time stamp wraparound, caused by TSF reset */
236 if (event->ts < dpd->last_pulse_ts)
237 dpd_reset(dpd);
238
239 /* do type individual pattern matching */
240 for (i = 0; i < dpd->num_radar_types; i++) {
241 struct pri_detector *pd = cd->detectors[i];
242 struct pri_sequence *ps = pd->add_pulse(pd, event);
243 if (ps != NULL) {
244 ath_dbg(dpd->common, DFS,
245 "DFS: radar found on freq=%d: id=%d, pri=%d, "
246 "count=%d, count_false=%d\n",
247 event->freq, pd->rs->type_id,
248 ps->pri, ps->count, ps->count_falses);
249 channel_detector_reset(dpd, cd);
250 return true;
251 }
252 }
253 return false;
254}
255
256static struct ath_dfs_pool_stats
257dpd_get_stats(struct dfs_pattern_detector *dpd)
258{
259 return global_dfs_pool_stats;
260}
261
262static bool dpd_set_domain(struct dfs_pattern_detector *dpd,
263 enum nl80211_dfs_regions region)
264{
265 const struct radar_types *rt;
266 struct channel_detector *cd, *cd0;
267
268 if (dpd->region == region)
269 return true;
270
271 dpd->region = NL80211_DFS_UNSET;
272
273 rt = get_dfs_domain_radar_types(region);
274 if (rt == NULL)
275 return false;
276
277 /* delete all channel detectors for previous DFS domain */
278 if (!list_empty(&dpd->channel_detectors))
279 list_for_each_entry_safe(cd, cd0, &dpd->channel_detectors, head)
280 channel_detector_exit(dpd, cd);
281 dpd->radar_spec = rt->radar_types;
282 dpd->num_radar_types = rt->num_radar_types;
283
284 dpd->region = region;
285 return true;
286}
287
288static struct dfs_pattern_detector default_dpd = {
289 .exit = dpd_exit,
290 .set_dfs_domain = dpd_set_domain,
291 .add_pulse = dpd_add_pulse,
292 .get_stats = dpd_get_stats,
293 .region = NL80211_DFS_UNSET,
294};
295
296struct dfs_pattern_detector *
297dfs_pattern_detector_init(struct ath_common *common,
298 enum nl80211_dfs_regions region)
299{
300 struct dfs_pattern_detector *dpd;
301
302 if (!config_enabled(CONFIG_CFG80211_CERTIFICATION_ONUS))
303 return NULL;
304
305 dpd = kmalloc(sizeof(*dpd), GFP_KERNEL);
306 if (dpd == NULL)
307 return NULL;
308
309 *dpd = default_dpd;
310 INIT_LIST_HEAD(&dpd->channel_detectors);
311
312 dpd->common = common;
313 if (dpd->set_dfs_domain(dpd, region))
314 return dpd;
315
316 ath_dbg(common, DFS,"Could not set DFS domain to %d", region);
317 kfree(dpd);
318 return NULL;
319}
320EXPORT_SYMBOL(dfs_pattern_detector_init);