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
30void 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
80void 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
114void 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
175static 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
203void 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->max_sleep_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