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regd.c revision 25985edcedea6396277003854657b5f3cb31a628 
1/******************************************************************************
2 *
3 * Copyright(c) 2009-2010  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 * 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.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, 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 * wlanfae <wlanfae@realtek.com>
23 * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
24 * Hsinchu 300, Taiwan.
25 *
26 * Larry Finger <Larry.Finger@lwfinger.net>
27 *
28 *****************************************************************************/
29
30#include "wifi.h"
31#include "regd.h"
32
33static struct country_code_to_enum_rd allCountries[] = {
34	{COUNTRY_CODE_FCC, "US"},
35	{COUNTRY_CODE_IC, "US"},
36	{COUNTRY_CODE_ETSI, "EC"},
37	{COUNTRY_CODE_SPAIN, "EC"},
38	{COUNTRY_CODE_FRANCE, "EC"},
39	{COUNTRY_CODE_MKK, "JP"},
40	{COUNTRY_CODE_MKK1, "JP"},
41	{COUNTRY_CODE_ISRAEL, "EC"},
42	{COUNTRY_CODE_TELEC, "JP"},
43	{COUNTRY_CODE_MIC, "JP"},
44	{COUNTRY_CODE_GLOBAL_DOMAIN, "JP"},
45	{COUNTRY_CODE_WORLD_WIDE_13, "EC"},
46	{COUNTRY_CODE_TELEC_NETGEAR, "EC"},
47};
48
49/*
50 *Only these channels all allow active
51 *scan on all world regulatory domains
52 */
53#define RTL819x_2GHZ_CH01_11	\
54	REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
55
56/*
57 *We enable active scan on these a case
58 *by case basis by regulatory domain
59 */
60#define RTL819x_2GHZ_CH12_13	\
61	REG_RULE(2467-10, 2472+10, 40, 0, 20,\
62	NL80211_RRF_PASSIVE_SCAN)
63
64#define RTL819x_2GHZ_CH14	\
65	REG_RULE(2484-10, 2484+10, 40, 0, 20, \
66	NL80211_RRF_PASSIVE_SCAN | \
67	NL80211_RRF_NO_OFDM)
68
69static const struct ieee80211_regdomain rtl_regdom_11 = {
70	.n_reg_rules = 1,
71	.alpha2 = "99",
72	.reg_rules = {
73		      RTL819x_2GHZ_CH01_11,
74	}
75};
76
77static const struct ieee80211_regdomain rtl_regdom_global = {
78	.n_reg_rules = 3,
79	.alpha2 = "99",
80	.reg_rules = {
81		      RTL819x_2GHZ_CH01_11,
82		      RTL819x_2GHZ_CH12_13,
83		      RTL819x_2GHZ_CH14,
84	}
85};
86
87static const struct ieee80211_regdomain rtl_regdom_world = {
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 bool _rtl_is_radar_freq(u16 center_freq)
97{
98	return (center_freq >= 5260 && center_freq <= 5700);
99}
100
101static void _rtl_reg_apply_beaconing_flags(struct wiphy *wiphy,
102					   enum nl80211_reg_initiator initiator)
103{
104	enum ieee80211_band band;
105	struct ieee80211_supported_band *sband;
106	const struct ieee80211_reg_rule *reg_rule;
107	struct ieee80211_channel *ch;
108	unsigned int i;
109	u32 bandwidth = 0;
110	int r;
111
112	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
113
114		if (!wiphy->bands[band])
115			continue;
116
117		sband = wiphy->bands[band];
118
119		for (i = 0; i < sband->n_channels; i++) {
120			ch = &sband->channels[i];
121			if (_rtl_is_radar_freq(ch->center_freq) ||
122			    (ch->flags & IEEE80211_CHAN_RADAR))
123				continue;
124			if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
125				r = freq_reg_info(wiphy, ch->center_freq,
126						  bandwidth, &reg_rule);
127				if (r)
128					continue;
129
130				/*
131				 *If 11d had a rule for this channel ensure
132				 *we enable adhoc/beaconing if it allows us to
133				 *use it. Note that we would have disabled it
134				 *by applying our static world regdomain by
135				 *default during init, prior to calling our
136				 *regulatory_hint().
137				 */
138
139				if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
140					ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
141				if (!(reg_rule->
142				     flags & NL80211_RRF_PASSIVE_SCAN))
143					ch->flags &=
144					    ~IEEE80211_CHAN_PASSIVE_SCAN;
145			} else {
146				if (ch->beacon_found)
147					ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
148						  IEEE80211_CHAN_PASSIVE_SCAN);
149			}
150		}
151	}
152}
153
154/* Allows active scan scan on Ch 12 and 13 */
155static void _rtl_reg_apply_active_scan_flags(struct wiphy *wiphy,
156					     enum nl80211_reg_initiator
157					     initiator)
158{
159	struct ieee80211_supported_band *sband;
160	struct ieee80211_channel *ch;
161	const struct ieee80211_reg_rule *reg_rule;
162	u32 bandwidth = 0;
163	int r;
164
165	sband = wiphy->bands[IEEE80211_BAND_2GHZ];
166
167	/*
168	 *If no country IE has been received always enable active scan
169	 *on these channels. This is only done for specific regulatory SKUs
170	 */
171	if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
172		ch = &sband->channels[11];	/* CH 12 */
173		if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
174			ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
175		ch = &sband->channels[12];	/* CH 13 */
176		if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
177			ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
178		return;
179	}
180
181	/*
182	 *If a country IE has been received check its rule for this
183	 *channel first before enabling active scan. The passive scan
184	 *would have been enforced by the initial processing of our
185	 *custom regulatory domain.
186	 */
187
188	ch = &sband->channels[11];	/* CH 12 */
189	r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
190	if (!r) {
191		if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
192			if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
193				ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
194	}
195
196	ch = &sband->channels[12];	/* CH 13 */
197	r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
198	if (!r) {
199		if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
200			if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
201				ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
202	}
203}
204
205/*
206 *Always apply Radar/DFS rules on
207 *freq range 5260 MHz - 5700 MHz
208 */
209static void _rtl_reg_apply_radar_flags(struct wiphy *wiphy)
210{
211	struct ieee80211_supported_band *sband;
212	struct ieee80211_channel *ch;
213	unsigned int i;
214
215	if (!wiphy->bands[IEEE80211_BAND_5GHZ])
216		return;
217
218	sband = wiphy->bands[IEEE80211_BAND_5GHZ];
219
220	for (i = 0; i < sband->n_channels; i++) {
221		ch = &sband->channels[i];
222		if (!_rtl_is_radar_freq(ch->center_freq))
223			continue;
224
225		/*
226		 *We always enable radar detection/DFS on this
227		 *frequency range. Additionally we also apply on
228		 *this frequency range:
229		 *- If STA mode does not yet have DFS supports disable
230		 * active scanning
231		 *- If adhoc mode does not support DFS yet then disable
232		 * adhoc in the frequency.
233		 *- If AP mode does not yet support radar detection/DFS
234		 *do not allow AP mode
235		 */
236		if (!(ch->flags & IEEE80211_CHAN_DISABLED))
237			ch->flags |= IEEE80211_CHAN_RADAR |
238			    IEEE80211_CHAN_NO_IBSS |
239			    IEEE80211_CHAN_PASSIVE_SCAN;
240	}
241}
242
243static void _rtl_reg_apply_world_flags(struct wiphy *wiphy,
244				       enum nl80211_reg_initiator initiator,
245				       struct rtl_regulatory *reg)
246{
247	_rtl_reg_apply_beaconing_flags(wiphy, initiator);
248	_rtl_reg_apply_active_scan_flags(wiphy, initiator);
249	return;
250}
251
252static void _rtl_dump_channel_map(struct wiphy *wiphy)
253{
254	enum ieee80211_band band;
255	struct ieee80211_supported_band *sband;
256	struct ieee80211_channel *ch;
257	unsigned int i;
258
259	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
260		if (!wiphy->bands[band])
261			continue;
262		sband = wiphy->bands[band];
263		for (i = 0; i < sband->n_channels; i++)
264			ch = &sband->channels[i];
265	}
266}
267
268static int _rtl_reg_notifier_apply(struct wiphy *wiphy,
269				   struct regulatory_request *request,
270				   struct rtl_regulatory *reg)
271{
272	/* We always apply this */
273	_rtl_reg_apply_radar_flags(wiphy);
274
275	switch (request->initiator) {
276	case NL80211_REGDOM_SET_BY_DRIVER:
277	case NL80211_REGDOM_SET_BY_CORE:
278	case NL80211_REGDOM_SET_BY_USER:
279		break;
280	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
281		_rtl_reg_apply_world_flags(wiphy, request->initiator, reg);
282		break;
283	}
284
285	_rtl_dump_channel_map(wiphy);
286
287	return 0;
288}
289
290static const struct ieee80211_regdomain *_rtl_regdomain_select(
291					       struct rtl_regulatory *reg)
292{
293	switch (reg->country_code) {
294	case COUNTRY_CODE_FCC:
295	case COUNTRY_CODE_IC:
296		return &rtl_regdom_11;
297	case COUNTRY_CODE_ETSI:
298	case COUNTRY_CODE_SPAIN:
299	case COUNTRY_CODE_FRANCE:
300	case COUNTRY_CODE_ISRAEL:
301	case COUNTRY_CODE_TELEC_NETGEAR:
302		return &rtl_regdom_world;
303	case COUNTRY_CODE_MKK:
304	case COUNTRY_CODE_MKK1:
305	case COUNTRY_CODE_TELEC:
306	case COUNTRY_CODE_MIC:
307		return &rtl_regdom_global;
308	case COUNTRY_CODE_GLOBAL_DOMAIN:
309		return &rtl_regdom_global;
310	case COUNTRY_CODE_WORLD_WIDE_13:
311		return &rtl_regdom_world;
312	default:
313		return &rtl_regdom_world;
314	}
315}
316
317static int _rtl_regd_init_wiphy(struct rtl_regulatory *reg,
318				struct wiphy *wiphy,
319				int (*reg_notifier) (struct wiphy *wiphy,
320						     struct regulatory_request *
321						     request))
322{
323	const struct ieee80211_regdomain *regd;
324
325	wiphy->reg_notifier = reg_notifier;
326	wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
327	wiphy->flags &= ~WIPHY_FLAG_STRICT_REGULATORY;
328	wiphy->flags &= ~WIPHY_FLAG_DISABLE_BEACON_HINTS;
329	regd = _rtl_regdomain_select(reg);
330	wiphy_apply_custom_regulatory(wiphy, regd);
331	_rtl_reg_apply_radar_flags(wiphy);
332	_rtl_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
333	return 0;
334}
335
336static struct country_code_to_enum_rd *_rtl_regd_find_country(u16 countrycode)
337{
338	int i;
339
340	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
341		if (allCountries[i].countrycode == countrycode)
342			return &allCountries[i];
343	}
344	return NULL;
345}
346
347int rtl_regd_init(struct ieee80211_hw *hw,
348		  int (*reg_notifier) (struct wiphy *wiphy,
349				       struct regulatory_request *request))
350{
351	struct rtl_priv *rtlpriv = rtl_priv(hw);
352	struct wiphy *wiphy = hw->wiphy;
353	struct country_code_to_enum_rd *country = NULL;
354
355	if (wiphy == NULL || &rtlpriv->regd == NULL)
356		return -EINVAL;
357
358	/* force the channel plan to world wide 13 */
359	rtlpriv->regd.country_code = COUNTRY_CODE_WORLD_WIDE_13;
360
361	RT_TRACE(rtlpriv, COMP_REGD, DBG_TRACE,
362		 (KERN_DEBUG "rtl: EEPROM regdomain: 0x%0x\n",
363		  rtlpriv->regd.country_code));
364
365	if (rtlpriv->regd.country_code >= COUNTRY_CODE_MAX) {
366		RT_TRACE(rtlpriv, COMP_REGD, DBG_DMESG,
367			 (KERN_DEBUG "rtl: EEPROM indicates invalid contry code"
368			  "world wide 13 should be used\n"));
369
370		rtlpriv->regd.country_code = COUNTRY_CODE_WORLD_WIDE_13;
371	}
372
373	country = _rtl_regd_find_country(rtlpriv->regd.country_code);
374
375	if (country) {
376		rtlpriv->regd.alpha2[0] = country->isoName[0];
377		rtlpriv->regd.alpha2[1] = country->isoName[1];
378	} else {
379		rtlpriv->regd.alpha2[0] = '0';
380		rtlpriv->regd.alpha2[1] = '0';
381	}
382
383	RT_TRACE(rtlpriv, COMP_REGD, DBG_TRACE,
384		 (KERN_DEBUG "rtl: Country alpha2 being used: %c%c\n",
385		  rtlpriv->regd.alpha2[0], rtlpriv->regd.alpha2[1]));
386
387	_rtl_regd_init_wiphy(&rtlpriv->regd, wiphy, reg_notifier);
388
389	return 0;
390}
391
392int rtl_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
393{
394	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
395	struct rtl_priv *rtlpriv = rtl_priv(hw);
396
397	RT_TRACE(rtlpriv, COMP_REGD, DBG_LOUD, ("\n"));
398
399	return _rtl_reg_notifier_apply(wiphy, request, &rtlpriv->regd);
400}
401