[go: nahoru, domu]
1/******************************************************************************
2 *
3 * Copyright(c) 2009-2012  Realtek Corporation.
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 * The full GNU General Public License is included in this distribution in the
15 * file called LICENSE.
16 *
17 * Contact Information:
18 * wlanfae <wlanfae@realtek.com>
19 * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
20 * Hsinchu 300, Taiwan.
21 *
22 * Larry Finger <Larry.Finger@lwfinger.net>
23 *
24 *****************************************************************************/
25
26#include "wifi.h"
27#include "regd.h"
28
29static struct country_code_to_enum_rd allCountries[] = {
30	{COUNTRY_CODE_FCC, "US"},
31	{COUNTRY_CODE_IC, "US"},
32	{COUNTRY_CODE_ETSI, "EC"},
33	{COUNTRY_CODE_SPAIN, "EC"},
34	{COUNTRY_CODE_FRANCE, "EC"},
35	{COUNTRY_CODE_MKK, "JP"},
36	{COUNTRY_CODE_MKK1, "JP"},
37	{COUNTRY_CODE_ISRAEL, "EC"},
38	{COUNTRY_CODE_TELEC, "JP"},
39	{COUNTRY_CODE_MIC, "JP"},
40	{COUNTRY_CODE_GLOBAL_DOMAIN, "JP"},
41	{COUNTRY_CODE_WORLD_WIDE_13, "EC"},
42	{COUNTRY_CODE_TELEC_NETGEAR, "EC"},
43};
44
45/*
46 *Only these channels all allow active
47 *scan on all world regulatory domains
48 */
49#define RTL819x_2GHZ_CH01_11	\
50	REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
51
52/*
53 *We enable active scan on these a case
54 *by case basis by regulatory domain
55 */
56#define RTL819x_2GHZ_CH12_13	\
57	REG_RULE(2467-10, 2472+10, 40, 0, 20,\
58	NL80211_RRF_PASSIVE_SCAN)
59
60#define RTL819x_2GHZ_CH14	\
61	REG_RULE(2484-10, 2484+10, 40, 0, 20, \
62	NL80211_RRF_PASSIVE_SCAN | \
63	NL80211_RRF_NO_OFDM)
64
65
66/* 5G chan 36 - chan 64*/
67#define RTL819x_5GHZ_5150_5350	\
68	REG_RULE(5150-10, 5350+10, 80, 0, 30, 0)
69/* 5G chan 100 - chan 165*/
70#define RTL819x_5GHZ_5470_5850	\
71	REG_RULE(5470-10, 5850+10, 80, 0, 30, 0)
72/* 5G chan 149 - chan 165*/
73#define RTL819x_5GHZ_5725_5850	\
74	REG_RULE(5725-10, 5850+10, 80, 0, 30, 0)
75
76#define RTL819x_5GHZ_ALL	\
77	(RTL819x_5GHZ_5150_5350, RTL819x_5GHZ_5470_5850)
78
79static const struct ieee80211_regdomain rtl_regdom_11 = {
80	.n_reg_rules = 1,
81	.alpha2 = "99",
82	.reg_rules = {
83		      RTL819x_2GHZ_CH01_11,
84		      }
85};
86
87static const struct ieee80211_regdomain rtl_regdom_12_13 = {
88	.n_reg_rules = 2,
89	.alpha2 = "99",
90	.reg_rules = {
91		      RTL819x_2GHZ_CH01_11,
92			  RTL819x_2GHZ_CH12_13,
93		      }
94};
95
96static const struct ieee80211_regdomain rtl_regdom_no_midband = {
97	.n_reg_rules = 3,
98	.alpha2 = "99",
99	.reg_rules = {
100		      RTL819x_2GHZ_CH01_11,
101			  RTL819x_5GHZ_5150_5350,
102			  RTL819x_5GHZ_5725_5850,
103		      }
104};
105
106static const struct ieee80211_regdomain rtl_regdom_60_64 = {
107	.n_reg_rules = 3,
108	.alpha2 = "99",
109	.reg_rules = {
110		      RTL819x_2GHZ_CH01_11,
111			  RTL819x_2GHZ_CH12_13,
112			  RTL819x_5GHZ_5725_5850,
113		      }
114};
115
116static const struct ieee80211_regdomain rtl_regdom_14_60_64 = {
117	.n_reg_rules = 4,
118	.alpha2 = "99",
119	.reg_rules = {
120		      RTL819x_2GHZ_CH01_11,
121			  RTL819x_2GHZ_CH12_13,
122			  RTL819x_2GHZ_CH14,
123			  RTL819x_5GHZ_5725_5850,
124		      }
125};
126
127static const struct ieee80211_regdomain rtl_regdom_14 = {
128	.n_reg_rules = 3,
129	.alpha2 = "99",
130	.reg_rules = {
131		      RTL819x_2GHZ_CH01_11,
132			  RTL819x_2GHZ_CH12_13,
133			  RTL819x_2GHZ_CH14,
134		      }
135};
136
137static bool _rtl_is_radar_freq(u16 center_freq)
138{
139	return center_freq >= 5260 && center_freq <= 5700;
140}
141
142static void _rtl_reg_apply_beaconing_flags(struct wiphy *wiphy,
143					   enum nl80211_reg_initiator initiator)
144{
145	enum ieee80211_band band;
146	struct ieee80211_supported_band *sband;
147	const struct ieee80211_reg_rule *reg_rule;
148	struct ieee80211_channel *ch;
149	unsigned int i;
150
151	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
152
153		if (!wiphy->bands[band])
154			continue;
155
156		sband = wiphy->bands[band];
157
158		for (i = 0; i < sband->n_channels; i++) {
159			ch = &sband->channels[i];
160			if (_rtl_is_radar_freq(ch->center_freq) ||
161			    (ch->flags & IEEE80211_CHAN_RADAR))
162				continue;
163			if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
164				reg_rule = freq_reg_info(wiphy,
165							 ch->center_freq);
166				if (IS_ERR(reg_rule))
167					continue;
168				/*
169				 *If 11d had a rule for this channel ensure
170				 *we enable adhoc/beaconing if it allows us to
171				 *use it. Note that we would have disabled it
172				 *by applying our static world regdomain by
173				 *default during init, prior to calling our
174				 *regulatory_hint().
175				 */
176
177				if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
178					ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
179				if (!(reg_rule->flags &
180				      NL80211_RRF_PASSIVE_SCAN))
181					ch->flags &=
182					    ~IEEE80211_CHAN_PASSIVE_SCAN;
183			} else {
184				if (ch->beacon_found)
185					ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
186						   IEEE80211_CHAN_PASSIVE_SCAN);
187			}
188		}
189	}
190}
191
192/* Allows active scan scan on Ch 12 and 13 */
193static void _rtl_reg_apply_active_scan_flags(struct wiphy *wiphy,
194					     enum nl80211_reg_initiator
195					     initiator)
196{
197	struct ieee80211_supported_band *sband;
198	struct ieee80211_channel *ch;
199	const struct ieee80211_reg_rule *reg_rule;
200
201	if (!wiphy->bands[IEEE80211_BAND_2GHZ])
202		return;
203	sband = wiphy->bands[IEEE80211_BAND_2GHZ];
204
205	/*
206	 *If no country IE has been received always enable active scan
207	 *on these channels. This is only done for specific regulatory SKUs
208	 */
209	if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
210		ch = &sband->channels[11];	/* CH 12 */
211		if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
212			ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
213		ch = &sband->channels[12];	/* CH 13 */
214		if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
215			ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
216		return;
217	}
218
219	/*
220	 *If a country IE has been recieved check its rule for this
221	 *channel first before enabling active scan. The passive scan
222	 *would have been enforced by the initial processing of our
223	 *custom regulatory domain.
224	 */
225
226	ch = &sband->channels[11];	/* CH 12 */
227	reg_rule = freq_reg_info(wiphy, ch->center_freq);
228	if (!IS_ERR(reg_rule)) {
229		if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
230			if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
231				ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
232	}
233
234	ch = &sband->channels[12];	/* CH 13 */
235	reg_rule = freq_reg_info(wiphy, ch->center_freq);
236	if (!IS_ERR(reg_rule)) {
237		if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
238			if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
239				ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
240	}
241}
242
243/*
244 *Always apply Radar/DFS rules on
245 *freq range 5260 MHz - 5700 MHz
246 */
247static void _rtl_reg_apply_radar_flags(struct wiphy *wiphy)
248{
249	struct ieee80211_supported_band *sband;
250	struct ieee80211_channel *ch;
251	unsigned int i;
252
253	if (!wiphy->bands[IEEE80211_BAND_5GHZ])
254		return;
255
256	sband = wiphy->bands[IEEE80211_BAND_5GHZ];
257
258	for (i = 0; i < sband->n_channels; i++) {
259		ch = &sband->channels[i];
260		if (!_rtl_is_radar_freq(ch->center_freq))
261			continue;
262
263		/*
264		 *We always enable radar detection/DFS on this
265		 *frequency range. Additionally we also apply on
266		 *this frequency range:
267		 *- If STA mode does not yet have DFS supports disable
268		 * active scanning
269		 *- If adhoc mode does not support DFS yet then disable
270		 * adhoc in the frequency.
271		 *- If AP mode does not yet support radar detection/DFS
272		 *do not allow AP mode
273		 */
274		if (!(ch->flags & IEEE80211_CHAN_DISABLED))
275			ch->flags |= IEEE80211_CHAN_RADAR |
276			    IEEE80211_CHAN_NO_IBSS |
277			    IEEE80211_CHAN_PASSIVE_SCAN;
278	}
279}
280
281static void _rtl_reg_apply_world_flags(struct wiphy *wiphy,
282				       enum nl80211_reg_initiator initiator,
283				       struct rtl_regulatory *reg)
284{
285	_rtl_reg_apply_beaconing_flags(wiphy, initiator);
286	_rtl_reg_apply_active_scan_flags(wiphy, initiator);
287	return;
288}
289
290static void _rtl_dump_channel_map(struct wiphy *wiphy)
291{
292	enum ieee80211_band band;
293	struct ieee80211_supported_band *sband;
294	struct ieee80211_channel *ch;
295	unsigned int i;
296
297	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
298		if (!wiphy->bands[band])
299			continue;
300		sband = wiphy->bands[band];
301		for (i = 0; i < sband->n_channels; i++)
302			ch = &sband->channels[i];
303	}
304}
305
306static int _rtl_reg_notifier_apply(struct wiphy *wiphy,
307				   struct regulatory_request *request,
308				   struct rtl_regulatory *reg)
309{
310	/* We always apply this */
311	_rtl_reg_apply_radar_flags(wiphy);
312
313	switch (request->initiator) {
314	case NL80211_REGDOM_SET_BY_DRIVER:
315	case NL80211_REGDOM_SET_BY_CORE:
316	case NL80211_REGDOM_SET_BY_USER:
317		break;
318	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
319		_rtl_reg_apply_world_flags(wiphy, request->initiator, reg);
320		break;
321	}
322
323	_rtl_dump_channel_map(wiphy);
324
325	return 0;
326}
327
328static const struct ieee80211_regdomain *_rtl_regdomain_select(
329						struct rtl_regulatory *reg)
330{
331	switch (reg->country_code) {
332	case COUNTRY_CODE_FCC:
333		return &rtl_regdom_no_midband;
334	case COUNTRY_CODE_IC:
335		return &rtl_regdom_11;
336	case COUNTRY_CODE_ETSI:
337	case COUNTRY_CODE_TELEC_NETGEAR:
338		return &rtl_regdom_60_64;
339	case COUNTRY_CODE_SPAIN:
340	case COUNTRY_CODE_FRANCE:
341	case COUNTRY_CODE_ISRAEL:
342	case COUNTRY_CODE_WORLD_WIDE_13:
343		return &rtl_regdom_12_13;
344	case COUNTRY_CODE_MKK:
345	case COUNTRY_CODE_MKK1:
346	case COUNTRY_CODE_TELEC:
347	case COUNTRY_CODE_MIC:
348		return &rtl_regdom_14_60_64;
349	case COUNTRY_CODE_GLOBAL_DOMAIN:
350		return &rtl_regdom_14;
351	default:
352		return &rtl_regdom_no_midband;
353	}
354}
355
356static int _rtl_regd_init_wiphy(struct rtl_regulatory *reg,
357				struct wiphy *wiphy,
358				void (*reg_notifier)(struct wiphy *wiphy,
359						     struct regulatory_request *
360						     request))
361{
362	const struct ieee80211_regdomain *regd;
363
364	wiphy->reg_notifier = reg_notifier;
365
366	wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
367	wiphy->regulatory_flags &= ~REGULATORY_STRICT_REG;
368	wiphy->regulatory_flags &= ~REGULATORY_DISABLE_BEACON_HINTS;
369	regd = _rtl_regdomain_select(reg);
370	wiphy_apply_custom_regulatory(wiphy, regd);
371	_rtl_reg_apply_radar_flags(wiphy);
372	_rtl_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
373	return 0;
374}
375
376static struct country_code_to_enum_rd *_rtl_regd_find_country(u16 countrycode)
377{
378	int i;
379
380	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
381		if (allCountries[i].countrycode == countrycode)
382			return &allCountries[i];
383	}
384	return NULL;
385}
386
387int rtl_regd_init(struct ieee80211_hw *hw,
388		  void (*reg_notifier)(struct wiphy *wiphy,
389				       struct regulatory_request *request))
390{
391	struct rtl_priv *rtlpriv = rtl_priv(hw);
392	struct wiphy *wiphy = hw->wiphy;
393	struct country_code_to_enum_rd *country = NULL;
394
395	if (wiphy == NULL || &rtlpriv->regd == NULL)
396		return -EINVAL;
397
398	/* init country_code from efuse channel plan */
399	rtlpriv->regd.country_code = rtlpriv->efuse.channel_plan;
400
401	RT_TRACE(rtlpriv, COMP_REGD, DBG_TRACE,
402		 "rtl: EEPROM regdomain: 0x%0x\n",
403		  rtlpriv->regd.country_code);
404
405	if (rtlpriv->regd.country_code >= COUNTRY_CODE_MAX) {
406		RT_TRACE(rtlpriv, COMP_REGD, DBG_DMESG,
407			 "rtl: EEPROM indicates invalid contry code, world wide 13 should be used\n");
408
409		rtlpriv->regd.country_code = COUNTRY_CODE_WORLD_WIDE_13;
410	}
411
412	country = _rtl_regd_find_country(rtlpriv->regd.country_code);
413
414	if (country) {
415		rtlpriv->regd.alpha2[0] = country->iso_name[0];
416		rtlpriv->regd.alpha2[1] = country->iso_name[1];
417	} else {
418		rtlpriv->regd.alpha2[0] = '0';
419		rtlpriv->regd.alpha2[1] = '0';
420	}
421
422	RT_TRACE(rtlpriv, COMP_REGD, DBG_TRACE,
423		 "rtl: Country alpha2 being used: %c%c\n",
424		  rtlpriv->regd.alpha2[0], rtlpriv->regd.alpha2[1]);
425
426	_rtl_regd_init_wiphy(&rtlpriv->regd, wiphy, reg_notifier);
427
428	return 0;
429}
430
431void rtl_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
432{
433	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
434	struct rtl_priv *rtlpriv = rtl_priv(hw);
435
436	RT_TRACE(rtlpriv, COMP_REGD, DBG_LOUD, "\n");
437
438	_rtl_reg_notifier_apply(wiphy, request, &rtlpriv->regd);
439}
440