aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/rt2x00/rt2x00config.c
blob: 07adc576db49dc28f92819c6ec46f04e926b4b48 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
/*
	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the
	Free Software Foundation, Inc.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
	Module: rt2x00lib
	Abstract: rt2x00 generic configuration routines.
 */

#include <linux/kernel.h>
#include <linux/module.h>

#include "rt2x00.h"
#include "rt2x00lib.h"


/*
 * The MAC and BSSID addressess are simple array of bytes,
 * these arrays are little endian, so when sending the addressess
 * to the drivers, copy the it into a endian-signed variable.
 *
 * Note that all devices (except rt2500usb) have 32 bits
 * register word sizes. This means that whatever variable we
 * pass _must_ be a multiple of 32 bits. Otherwise the device
 * might not accept what we are sending to it.
 * This will also make it easier for the driver to write
 * the data to the device.
 *
 * Also note that when NULL is passed as address the
 * we will send 00:00:00:00:00 to the device to clear the address.
 * This will prevent the device being confused when it wants
 * to ACK frames or consideres itself associated.
 */
void rt2x00lib_config_mac_addr(struct rt2x00_dev *rt2x00dev, u8 *mac)
{
	__le32 reg[2];

	memset(&reg, 0, sizeof(reg));
	if (mac)
		memcpy(&reg, mac, ETH_ALEN);

	rt2x00dev->ops->lib->config_mac_addr(rt2x00dev, &reg[0]);
}

void rt2x00lib_config_bssid(struct rt2x00_dev *rt2x00dev, u8 *bssid)
{
	__le32 reg[2];

	memset(&reg, 0, sizeof(reg));
	if (bssid)
		memcpy(&reg, bssid, ETH_ALEN);

	rt2x00dev->ops->lib->config_bssid(rt2x00dev, &reg[0]);
}

void rt2x00lib_config_type(struct rt2x00_dev *rt2x00dev, const int type)
{
	int tsf_sync;

	switch (type) {
	case IEEE80211_IF_TYPE_IBSS:
	case IEEE80211_IF_TYPE_AP:
		tsf_sync = TSF_SYNC_BEACON;
		break;
	case IEEE80211_IF_TYPE_STA:
		tsf_sync = TSF_SYNC_INFRA;
		break;
	default:
		tsf_sync = TSF_SYNC_NONE;
		break;
	}

	rt2x00dev->ops->lib->config_type(rt2x00dev, type, tsf_sync);
}

void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
			      enum antenna rx, enum antenna tx)
{
	struct rt2x00lib_conf libconf;

	libconf.ant.rx = rx;
	libconf.ant.tx = tx;

	if (rx == rt2x00dev->link.ant.active.rx &&
	    tx == rt2x00dev->link.ant.active.tx)
		return;

	/*
	 * Antenna setup changes require the RX to be disabled,
	 * else the changes will be ignored by the device.
	 */
	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
		rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);

	/*
	 * Write new antenna setup to device and reset the link tuner.
	 * The latter is required since we need to recalibrate the
	 * noise-sensitivity ratio for the new setup.
	 */
	rt2x00dev->ops->lib->config(rt2x00dev, CONFIG_UPDATE_ANTENNA, &libconf);
	rt2x00lib_reset_link_tuner(rt2x00dev);

	rt2x00dev->link.ant.active.rx = libconf.ant.rx;
	rt2x00dev->link.ant.active.tx = libconf.ant.tx;

	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
		rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
}

void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
		      struct ieee80211_conf *conf, const int force_config)
{
	struct rt2x00lib_conf libconf;
	struct ieee80211_hw_mode *mode;
	struct ieee80211_rate *rate;
	struct antenna_setup *default_ant = &rt2x00dev->default_ant;
	struct antenna_setup *active_ant = &rt2x00dev->link.ant.active;
	int flags = 0;
	int short_slot_time;

	/*
	 * In some situations we want to force all configurations
	 * to be reloaded (When resuming for instance).
	 */
	if (force_config) {
		flags = CONFIG_UPDATE_ALL;
		goto config;
	}

	/*
	 * Check which configuration options have been
	 * updated and should be send to the device.
	 */
	if (rt2x00dev->rx_status.phymode != conf->phymode)
		flags |= CONFIG_UPDATE_PHYMODE;
	if (rt2x00dev->rx_status.channel != conf->channel)
		flags |= CONFIG_UPDATE_CHANNEL;
	if (rt2x00dev->tx_power != conf->power_level)
		flags |= CONFIG_UPDATE_TXPOWER;

	/*
	 * Determining changes in the antenna setups request several checks:
	 * antenna_sel_{r,t}x = 0
	 *    -> Does active_{r,t}x match default_{r,t}x
	 *    -> Is default_{r,t}x SW_DIVERSITY
	 * antenna_sel_{r,t}x = 1/2
	 *    -> Does active_{r,t}x match antenna_sel_{r,t}x
	 * The reason for not updating the antenna while SW diversity
	 * should be used is simple: Software diversity means that
	 * we should switch between the antenna's based on the
	 * quality. This means that the current antenna is good enough
	 * to work with untill the link tuner decides that an antenna
	 * switch should be performed.
	 */
	if (!conf->antenna_sel_rx &&
	    default_ant->rx != ANTENNA_SW_DIVERSITY &&
	    default_ant->rx != active_ant->rx)
		flags |= CONFIG_UPDATE_ANTENNA;
	else if (conf->antenna_sel_rx &&
		 conf->antenna_sel_rx != active_ant->rx)
		flags |= CONFIG_UPDATE_ANTENNA;
	else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
		flags |= CONFIG_UPDATE_ANTENNA;

	if (!conf->antenna_sel_tx &&
	    default_ant->tx != ANTENNA_SW_DIVERSITY &&
	    default_ant->tx != active_ant->tx)
		flags |= CONFIG_UPDATE_ANTENNA;
	else if (conf->antenna_sel_tx &&
		 conf->antenna_sel_tx != active_ant->tx)
		flags |= CONFIG_UPDATE_ANTENNA;
	else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
		flags |= CONFIG_UPDATE_ANTENNA;

	/*
	 * The following configuration options are never
	 * stored anywhere and will always be updated.
	 */
	flags |= CONFIG_UPDATE_SLOT_TIME;
	flags |= CONFIG_UPDATE_BEACON_INT;

	/*
	 * We have determined what options should be updated,
	 * now precalculate device configuration values depending
	 * on what configuration options need to be updated.
	 */
config:
	memset(&libconf, 0, sizeof(libconf));

	if (flags & CONFIG_UPDATE_PHYMODE) {
		switch (conf->phymode) {
		case MODE_IEEE80211A:
			libconf.phymode = HWMODE_A;
			break;
		case MODE_IEEE80211B:
			libconf.phymode = HWMODE_B;
			break;
		case MODE_IEEE80211G:
			libconf.phymode = HWMODE_G;
			break;
		default:
			ERROR(rt2x00dev,
			      "Attempt to configure unsupported mode (%d)"
			      "Defaulting to 802.11b", conf->phymode);
			libconf.phymode = HWMODE_B;
		}

		mode = &rt2x00dev->hwmodes[libconf.phymode];
		rate = &mode->rates[mode->num_rates - 1];

		libconf.basic_rates =
		    DEVICE_GET_RATE_FIELD(rate->val, RATEMASK) & DEV_BASIC_RATEMASK;
	}

	if (flags & CONFIG_UPDATE_CHANNEL) {
		memcpy(&libconf.rf,
		       &rt2x00dev->spec.channels[conf->channel_val],
		       sizeof(libconf.rf));
	}

	if (flags & CONFIG_UPDATE_ANTENNA) {
		if (conf->antenna_sel_rx)
			libconf.ant.rx = conf->antenna_sel_rx;
		else if (default_ant->rx != ANTENNA_SW_DIVERSITY)
			libconf.ant.rx = default_ant->rx;
		else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
			libconf.ant.rx = ANTENNA_B;

		if (conf->antenna_sel_tx)
			libconf.ant.tx = conf->antenna_sel_tx;
		else if (default_ant->tx != ANTENNA_SW_DIVERSITY)
			libconf.ant.tx = default_ant->tx;
		else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
			libconf.ant.tx = ANTENNA_B;
	}

	if (flags & CONFIG_UPDATE_SLOT_TIME) {
		short_slot_time = conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME;

		libconf.slot_time =
		    short_slot_time ? SHORT_SLOT_TIME : SLOT_TIME;
		libconf.sifs = SIFS;
		libconf.pifs = short_slot_time ? SHORT_PIFS : PIFS;
		libconf.difs = short_slot_time ? SHORT_DIFS : DIFS;
		libconf.eifs = EIFS;
	}

	libconf.conf = conf;

	/*
	 * Start configuration.
	 */
	rt2x00dev->ops->lib->config(rt2x00dev, flags, &libconf);

	/*
	 * Some configuration changes affect the link quality
	 * which means we need to reset the link tuner.
	 */
	if (flags & (CONFIG_UPDATE_CHANNEL | CONFIG_UPDATE_ANTENNA))
		rt2x00lib_reset_link_tuner(rt2x00dev);

	if (flags & CONFIG_UPDATE_PHYMODE) {
		rt2x00dev->curr_hwmode = libconf.phymode;
		rt2x00dev->rx_status.phymode = conf->phymode;
	}

	rt2x00dev->rx_status.freq = conf->freq;
	rt2x00dev->rx_status.channel = conf->channel;
	rt2x00dev->tx_power = conf->power_level;

	if (flags & CONFIG_UPDATE_ANTENNA) {
		rt2x00dev->link.ant.active.rx = libconf.ant.rx;
		rt2x00dev->link.ant.active.tx = libconf.ant.tx;
	}
}