1 /*
2 	Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
3 	<http://rt2x00.serialmonkey.com>
4 
5 	This program is free software; you can redistribute it and/or modify
6 	it under the terms of the GNU General Public License as published by
7 	the Free Software Foundation; either version 2 of the License, or
8 	(at your option) any later version.
9 
10 	This program is distributed in the hope that it will be useful,
11 	but WITHOUT ANY WARRANTY; without even the implied warranty of
12 	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 	GNU General Public License for more details.
14 
15 	You should have received a copy of the GNU General Public License
16 	along with this program; if not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 /*
20 	Module: rt2x00lib
21 	Abstract: rt2x00 generic configuration routines.
22  */
23 
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 
27 #include "rt2x00.h"
28 #include "rt2x00lib.h"
29 
30 void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
31 			   struct rt2x00_intf *intf,
32 			   enum nl80211_iftype type,
33 			   const u8 *mac, const u8 *bssid)
34 {
35 	struct rt2x00intf_conf conf;
36 	unsigned int flags = 0;
37 
38 	conf.type = type;
39 
40 	switch (type) {
41 	case NL80211_IFTYPE_ADHOC:
42 		conf.sync = TSF_SYNC_ADHOC;
43 		break;
44 	case NL80211_IFTYPE_AP:
45 	case NL80211_IFTYPE_MESH_POINT:
46 	case NL80211_IFTYPE_WDS:
47 		conf.sync = TSF_SYNC_AP_NONE;
48 		break;
49 	case NL80211_IFTYPE_STATION:
50 		conf.sync = TSF_SYNC_INFRA;
51 		break;
52 	default:
53 		conf.sync = TSF_SYNC_NONE;
54 		break;
55 	}
56 
57 	/*
58 	 * Note that when NULL is passed as address we will send
59 	 * 00:00:00:00:00 to the device to clear the address.
60 	 * This will prevent the device being confused when it wants
61 	 * to ACK frames or considers itself associated.
62 	 */
63 	memset(conf.mac, 0, sizeof(conf.mac));
64 	if (mac)
65 		memcpy(conf.mac, mac, ETH_ALEN);
66 
67 	memset(conf.bssid, 0, sizeof(conf.bssid));
68 	if (bssid)
69 		memcpy(conf.bssid, bssid, ETH_ALEN);
70 
71 	flags |= CONFIG_UPDATE_TYPE;
72 	if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
73 		flags |= CONFIG_UPDATE_MAC;
74 	if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
75 		flags |= CONFIG_UPDATE_BSSID;
76 
77 	rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
78 }
79 
80 void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
81 			  struct rt2x00_intf *intf,
82 			  struct ieee80211_bss_conf *bss_conf,
83 			  u32 changed)
84 {
85 	struct rt2x00lib_erp erp;
86 
87 	memset(&erp, 0, sizeof(erp));
88 
89 	erp.short_preamble = bss_conf->use_short_preamble;
90 	erp.cts_protection = bss_conf->use_cts_prot;
91 
92 	erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
93 	erp.sifs = SIFS;
94 	erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
95 	erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
96 	erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
97 
98 	erp.basic_rates = bss_conf->basic_rates;
99 	erp.beacon_int = bss_conf->beacon_int;
100 
101 	/* Update the AID, this is needed for dynamic PS support */
102 	rt2x00dev->aid = bss_conf->assoc ? bss_conf->aid : 0;
103 	rt2x00dev->last_beacon = bss_conf->sync_tsf;
104 
105 	/* Update global beacon interval time, this is needed for PS support */
106 	rt2x00dev->beacon_int = bss_conf->beacon_int;
107 
108 	if (changed & BSS_CHANGED_HT)
109 		erp.ht_opmode = bss_conf->ht_operation_mode;
110 
111 	rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp, changed);
112 }
113 
114 void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
115 			      struct antenna_setup config)
116 {
117 	struct link_ant *ant = &rt2x00dev->link.ant;
118 	struct antenna_setup *def = &rt2x00dev->default_ant;
119 	struct antenna_setup *active = &rt2x00dev->link.ant.active;
120 
121 	/*
122 	 * When the caller tries to send the SW diversity,
123 	 * we must update the ANTENNA_RX_DIVERSITY flag to
124 	 * enable the antenna diversity in the link tuner.
125 	 *
126 	 * Secondly, we must guarentee we never send the
127 	 * software antenna diversity command to the driver.
128 	 */
129 	if (!(ant->flags & ANTENNA_RX_DIVERSITY)) {
130 		if (config.rx == ANTENNA_SW_DIVERSITY) {
131 			ant->flags |= ANTENNA_RX_DIVERSITY;
132 
133 			if (def->rx == ANTENNA_SW_DIVERSITY)
134 				config.rx = ANTENNA_B;
135 			else
136 				config.rx = def->rx;
137 		}
138 	} else if (config.rx == ANTENNA_SW_DIVERSITY)
139 		config.rx = active->rx;
140 
141 	if (!(ant->flags & ANTENNA_TX_DIVERSITY)) {
142 		if (config.tx == ANTENNA_SW_DIVERSITY) {
143 			ant->flags |= ANTENNA_TX_DIVERSITY;
144 
145 			if (def->tx == ANTENNA_SW_DIVERSITY)
146 				config.tx = ANTENNA_B;
147 			else
148 				config.tx = def->tx;
149 		}
150 	} else if (config.tx == ANTENNA_SW_DIVERSITY)
151 		config.tx = active->tx;
152 
153 	/*
154 	 * Antenna setup changes require the RX to be disabled,
155 	 * else the changes will be ignored by the device.
156 	 */
157 	if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
158 		rt2x00queue_stop_queue(rt2x00dev->rx);
159 
160 	/*
161 	 * Write new antenna setup to device and reset the link tuner.
162 	 * The latter is required since we need to recalibrate the
163 	 * noise-sensitivity ratio for the new setup.
164 	 */
165 	rt2x00dev->ops->lib->config_ant(rt2x00dev, &config);
166 
167 	rt2x00link_reset_tuner(rt2x00dev, true);
168 
169 	memcpy(active, &config, sizeof(config));
170 
171 	if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
172 		rt2x00queue_start_queue(rt2x00dev->rx);
173 }
174 
175 static u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
176 				   struct ieee80211_conf *conf)
177 {
178 	struct hw_mode_spec *spec = &rt2x00dev->spec;
179 	int center_channel;
180 	u16 i;
181 
182 	/*
183 	 * Initialize center channel to current channel.
184 	 */
185 	center_channel = spec->channels[conf->chandef.chan->hw_value].channel;
186 
187 	/*
188 	 * Adjust center channel to HT40+ and HT40- operation.
189 	 */
190 	if (conf_is_ht40_plus(conf))
191 		center_channel += 2;
192 	else if (conf_is_ht40_minus(conf))
193 		center_channel -= (center_channel == 14) ? 1 : 2;
194 
195 	for (i = 0; i < spec->num_channels; i++)
196 		if (spec->channels[i].channel == center_channel)
197 			return i;
198 
199 	WARN_ON(1);
200 	return conf->chandef.chan->hw_value;
201 }
202 
203 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
204 		      struct ieee80211_conf *conf,
205 		      unsigned int ieee80211_flags)
206 {
207 	struct rt2x00lib_conf libconf;
208 	u16 hw_value;
209 	u16 autowake_timeout;
210 	u16 beacon_int;
211 	u16 beacon_diff;
212 
213 	memset(&libconf, 0, sizeof(libconf));
214 
215 	libconf.conf = conf;
216 
217 	if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
218 		if (!conf_is_ht(conf))
219 			set_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);
220 		else
221 			clear_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);
222 
223 		if (conf_is_ht40(conf)) {
224 			set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
225 			hw_value = rt2x00ht_center_channel(rt2x00dev, conf);
226 		} else {
227 			clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
228 			hw_value = conf->chandef.chan->hw_value;
229 		}
230 
231 		memcpy(&libconf.rf,
232 		       &rt2x00dev->spec.channels[hw_value],
233 		       sizeof(libconf.rf));
234 
235 		memcpy(&libconf.channel,
236 		       &rt2x00dev->spec.channels_info[hw_value],
237 		       sizeof(libconf.channel));
238 
239 		/* Used for VCO periodic calibration */
240 		rt2x00dev->rf_channel = libconf.rf.channel;
241 	}
242 
243 	if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_PS_AUTOWAKE) &&
244 	    (ieee80211_flags & IEEE80211_CONF_CHANGE_PS))
245 		cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
246 
247 	/*
248 	 * Start configuration.
249 	 */
250 	rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);
251 
252 	/*
253 	 * Some configuration changes affect the link quality
254 	 * which means we need to reset the link tuner.
255 	 */
256 	if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
257 		rt2x00link_reset_tuner(rt2x00dev, false);
258 
259 	if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
260 	    rt2x00_has_cap_flag(rt2x00dev, REQUIRE_PS_AUTOWAKE) &&
261 	    (ieee80211_flags & IEEE80211_CONF_CHANGE_PS) &&
262 	    (conf->flags & IEEE80211_CONF_PS)) {
263 		beacon_diff = (long)jiffies - (long)rt2x00dev->last_beacon;
264 		beacon_int = msecs_to_jiffies(rt2x00dev->beacon_int);
265 
266 		if (beacon_diff > beacon_int)
267 			beacon_diff = 0;
268 
269 		autowake_timeout = (conf->ps_dtim_period * beacon_int) - beacon_diff;
270 		queue_delayed_work(rt2x00dev->workqueue,
271 				   &rt2x00dev->autowakeup_work,
272 				   autowake_timeout - 15);
273 	}
274 
275 	if (conf->flags & IEEE80211_CONF_PS)
276 		set_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
277 	else
278 		clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
279 
280 	rt2x00dev->curr_band = conf->chandef.chan->band;
281 	rt2x00dev->curr_freq = conf->chandef.chan->center_freq;
282 	rt2x00dev->tx_power = conf->power_level;
283 	rt2x00dev->short_retry = conf->short_frame_max_tx_count;
284 	rt2x00dev->long_retry = conf->long_frame_max_tx_count;
285 }
286