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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, write to the
17 Free Software Foundation, Inc.,
18 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21/*
22 Module: rt2x00lib
23 Abstract: rt2x00 generic configuration routines.
24 */
25
26#include <linux/kernel.h>
27#include <linux/module.h>
28
29#include "rt2x00.h"
30#include "rt2x00lib.h"
31
32void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
33 struct rt2x00_intf *intf,
34 enum nl80211_iftype type,
35 const u8 *mac, const u8 *bssid)
36{
37 struct rt2x00intf_conf conf;
38 unsigned int flags = 0;
39
40 conf.type = type;
41
42 switch (type) {
43 case NL80211_IFTYPE_ADHOC:
44 conf.sync = TSF_SYNC_ADHOC;
45 break;
46 case NL80211_IFTYPE_AP:
47 case NL80211_IFTYPE_MESH_POINT:
48 case NL80211_IFTYPE_WDS:
49 conf.sync = TSF_SYNC_AP_NONE;
50 break;
51 case NL80211_IFTYPE_STATION:
52 conf.sync = TSF_SYNC_INFRA;
53 break;
54 default:
55 conf.sync = TSF_SYNC_NONE;
56 break;
57 }
58
59 /*
60 * Note that when NULL is passed as address we will send
61 * 00:00:00:00:00 to the device to clear the address.
62 * This will prevent the device being confused when it wants
63 * to ACK frames or considers itself associated.
64 */
65 memset(conf.mac, 0, sizeof(conf.mac));
66 if (mac)
67 memcpy(conf.mac, mac, ETH_ALEN);
68
69 memset(conf.bssid, 0, sizeof(conf.bssid));
70 if (bssid)
71 memcpy(conf.bssid, bssid, ETH_ALEN);
72
73 flags |= CONFIG_UPDATE_TYPE;
74 if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
75 flags |= CONFIG_UPDATE_MAC;
76 if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
77 flags |= CONFIG_UPDATE_BSSID;
78
79 rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
80}
81
82void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
83 struct rt2x00_intf *intf,
84 struct ieee80211_bss_conf *bss_conf,
85 u32 changed)
86{
87 struct rt2x00lib_erp erp;
88
89 memset(&erp, 0, sizeof(erp));
90
91 erp.short_preamble = bss_conf->use_short_preamble;
92 erp.cts_protection = bss_conf->use_cts_prot;
93
94 erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
95 erp.sifs = SIFS;
96 erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
97 erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
98 erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
99
100 erp.basic_rates = bss_conf->basic_rates;
101 erp.beacon_int = bss_conf->beacon_int;
102
103 /* Update the AID, this is needed for dynamic PS support */
104 rt2x00dev->aid = bss_conf->assoc ? bss_conf->aid : 0;
105 rt2x00dev->last_beacon = bss_conf->timestamp;
106
107 /* Update global beacon interval time, this is needed for PS support */
108 rt2x00dev->beacon_int = bss_conf->beacon_int;
109
110 if (changed & BSS_CHANGED_HT)
111 erp.ht_opmode = bss_conf->ht_operation_mode;
112
113 rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp, changed);
114}
115
116void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
117 struct antenna_setup config)
118{
119 struct link_ant *ant = &rt2x00dev->link.ant;
120 struct antenna_setup *def = &rt2x00dev->default_ant;
121 struct antenna_setup *active = &rt2x00dev->link.ant.active;
122
123 /*
124 * When the caller tries to send the SW diversity,
125 * we must update the ANTENNA_RX_DIVERSITY flag to
126 * enable the antenna diversity in the link tuner.
127 *
128 * Secondly, we must guarentee we never send the
129 * software antenna diversity command to the driver.
130 */
131 if (!(ant->flags & ANTENNA_RX_DIVERSITY)) {
132 if (config.rx == ANTENNA_SW_DIVERSITY) {
133 ant->flags |= ANTENNA_RX_DIVERSITY;
134
135 if (def->rx == ANTENNA_SW_DIVERSITY)
136 config.rx = ANTENNA_B;
137 else
138 config.rx = def->rx;
139 }
140 } else if (config.rx == ANTENNA_SW_DIVERSITY)
141 config.rx = active->rx;
142
143 if (!(ant->flags & ANTENNA_TX_DIVERSITY)) {
144 if (config.tx == ANTENNA_SW_DIVERSITY) {
145 ant->flags |= ANTENNA_TX_DIVERSITY;
146
147 if (def->tx == ANTENNA_SW_DIVERSITY)
148 config.tx = ANTENNA_B;
149 else
150 config.tx = def->tx;
151 }
152 } else if (config.tx == ANTENNA_SW_DIVERSITY)
153 config.tx = active->tx;
154
155 /*
156 * Antenna setup changes require the RX to be disabled,
157 * else the changes will be ignored by the device.
158 */
159 if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
160 rt2x00queue_stop_queue(rt2x00dev->rx);
161
162 /*
163 * Write new antenna setup to device and reset the link tuner.
164 * The latter is required since we need to recalibrate the
165 * noise-sensitivity ratio for the new setup.
166 */
167 rt2x00dev->ops->lib->config_ant(rt2x00dev, &config);
168
169 rt2x00link_reset_tuner(rt2x00dev, true);
170
171 memcpy(active, &config, sizeof(config));
172
173 if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
174 rt2x00queue_start_queue(rt2x00dev->rx);
175}
176
177static u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
178 struct ieee80211_conf *conf)
179{
180 struct hw_mode_spec *spec = &rt2x00dev->spec;
181 int center_channel;
182 u16 i;
183
184 /*
185 * Initialize center channel to current channel.
186 */
187 center_channel = spec->channels[conf->channel->hw_value].channel;
188
189 /*
190 * Adjust center channel to HT40+ and HT40- operation.
191 */
192 if (conf_is_ht40_plus(conf))
193 center_channel += 2;
194 else if (conf_is_ht40_minus(conf))
195 center_channel -= (center_channel == 14) ? 1 : 2;
196
197 for (i = 0; i < spec->num_channels; i++)
198 if (spec->channels[i].channel == center_channel)
199 return i;
200
201 WARN_ON(1);
202 return conf->channel->hw_value;
203}
204
205void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
206 struct ieee80211_conf *conf,
207 unsigned int ieee80211_flags)
208{
209 struct rt2x00lib_conf libconf;
210 u16 hw_value;
211 u16 autowake_timeout;
212 u16 beacon_int;
213 u16 beacon_diff;
214
215 memset(&libconf, 0, sizeof(libconf));
216
217 libconf.conf = conf;
218
219 if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
220 if (conf_is_ht40(conf)) {
221 set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
222 hw_value = rt2x00ht_center_channel(rt2x00dev, conf);
223 } else {
224 clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
225 hw_value = conf->channel->hw_value;
226 }
227
228 memcpy(&libconf.rf,
229 &rt2x00dev->spec.channels[hw_value],
230 sizeof(libconf.rf));
231
232 memcpy(&libconf.channel,
233 &rt2x00dev->spec.channels_info[hw_value],
234 sizeof(libconf.channel));
235 }
236
237 if (test_bit(REQUIRE_PS_AUTOWAKE, &rt2x00dev->cap_flags) &&
238 (ieee80211_flags & IEEE80211_CONF_CHANGE_PS))
239 cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
240
241 /*
242 * Start configuration.
243 */
244 rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);
245
246 /*
247 * Some configuration changes affect the link quality
248 * which means we need to reset the link tuner.
249 */
250 if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
251 rt2x00link_reset_tuner(rt2x00dev, false);
252
253 if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
254 test_bit(REQUIRE_PS_AUTOWAKE, &rt2x00dev->cap_flags) &&
255 (ieee80211_flags & IEEE80211_CONF_CHANGE_PS) &&
256 (conf->flags & IEEE80211_CONF_PS)) {
257 beacon_diff = (long)jiffies - (long)rt2x00dev->last_beacon;
258 beacon_int = msecs_to_jiffies(rt2x00dev->beacon_int);
259
260 if (beacon_diff > beacon_int)
261 beacon_diff = 0;
262
263 autowake_timeout = (conf->max_sleep_period * beacon_int) - beacon_diff;
264 queue_delayed_work(rt2x00dev->workqueue,
265 &rt2x00dev->autowakeup_work,
266 autowake_timeout - 15);
267 }
268
269 if (conf->flags & IEEE80211_CONF_PS)
270 set_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
271 else
272 clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
273
274 rt2x00dev->curr_band = conf->channel->band;
275 rt2x00dev->curr_freq = conf->channel->center_freq;
276 rt2x00dev->tx_power = conf->power_level;
277 rt2x00dev->short_retry = conf->short_frame_max_tx_count;
278 rt2x00dev->long_retry = conf->long_frame_max_tx_count;
279}