aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/wl12xx/event.c
blob: d7be3aec6fc38cdb2feb83335a150deef07200e6 (plain)
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
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
/*
 * This file is part of wl1271
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include "wl12xx.h"
#include "reg.h"
#include "io.h"
#include "event.h"
#include "ps.h"
#include "scan.h"
#include "wl12xx_80211.h"

void wl1271_pspoll_work(struct work_struct *work)
{
	struct delayed_work *dwork;
	struct wl1271 *wl;
	int ret;

	dwork = container_of(work, struct delayed_work, work);
	wl = container_of(dwork, struct wl1271, pspoll_work);

	wl1271_debug(DEBUG_EVENT, "pspoll work");

	mutex_lock(&wl->mutex);

	if (unlikely(wl->state == WL1271_STATE_OFF))
		goto out;

	if (!test_and_clear_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags))
		goto out;

	if (!test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
		goto out;

	/*
	 * if we end up here, then we were in powersave when the pspoll
	 * delivery failure occurred, and no-one changed state since, so
	 * we should go back to powersave.
	 */
	ret = wl1271_ps_elp_wakeup(wl);
	if (ret < 0)
		goto out;

	wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true);

	wl1271_ps_elp_sleep(wl);
out:
	mutex_unlock(&wl->mutex);
};

static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl)
{
	int delay = wl->conf.conn.ps_poll_recovery_period;
	int ret;

	wl->ps_poll_failures++;
	if (wl->ps_poll_failures == 1)
		wl1271_info("AP with dysfunctional ps-poll, "
			    "trying to work around it.");

	/* force active mode receive data from the AP */
	if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
		ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
					 wl->basic_rate, true);
		if (ret < 0)
			return;
		set_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags);
		ieee80211_queue_delayed_work(wl->hw, &wl->pspoll_work,
					     msecs_to_jiffies(delay));
	}

	/*
	 * If already in active mode, lets we should be getting data from
	 * the AP right away. If we enter PSM too fast after this, and data
	 * remains on the AP, we will get another event like this, and we'll
	 * go into active once more.
	 */
}

static int wl1271_event_ps_report(struct wl1271 *wl,
				  struct event_mailbox *mbox,
				  bool *beacon_loss)
{
	int ret = 0;
	u32 total_retries = wl->conf.conn.psm_entry_retries;

	wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);

	switch (mbox->ps_status) {
	case EVENT_ENTER_POWER_SAVE_FAIL:
		wl1271_debug(DEBUG_PSM, "PSM entry failed");

		if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
			/* remain in active mode */
			wl->psm_entry_retry = 0;
			break;
		}

		if (wl->psm_entry_retry < total_retries) {
			wl->psm_entry_retry++;
			ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
						 wl->basic_rate, true);
		} else {
			wl1271_info("No ack to nullfunc from AP.");
			wl->psm_entry_retry = 0;
			*beacon_loss = true;
		}
		break;
	case EVENT_ENTER_POWER_SAVE_SUCCESS:
		wl->psm_entry_retry = 0;

		/* enable beacon filtering */
		ret = wl1271_acx_beacon_filter_opt(wl, true);
		if (ret < 0)
			break;

		/* enable beacon early termination */
		ret = wl1271_acx_bet_enable(wl, true);
		break;
	default:
		break;
	}

	return ret;
}

static void wl1271_event_rssi_trigger(struct wl1271 *wl,
				      struct event_mailbox *mbox)
{
	enum nl80211_cqm_rssi_threshold_event event;
	s8 metric = mbox->rssi_snr_trigger_metric[0];

	wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);

	if (metric <= wl->rssi_thold)
		event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
	else
		event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;

	if (event != wl->last_rssi_event)
		ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
	wl->last_rssi_event = event;
}

static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
{
	wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
	wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
	wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
}

static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
{
	int ret;
	u32 vector;
	bool beacon_loss = false;
	bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
	bool disconnect_sta = false;
	unsigned long sta_bitmap = 0;

	wl1271_event_mbox_dump(mbox);

	vector = le32_to_cpu(mbox->events_vector);
	vector &= ~(le32_to_cpu(mbox->events_mask));
	wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);

	if (vector & SCAN_COMPLETE_EVENT_ID) {
		wl1271_debug(DEBUG_EVENT, "status: 0x%x",
			     mbox->scheduled_scan_status);

		wl1271_scan_stm(wl);
	}

	/* disable dynamic PS when requested by the firmware */
	if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
	    wl->bss_type == BSS_TYPE_STA_BSS) {
		if (mbox->soft_gemini_sense_info)
			ieee80211_disable_dyn_ps(wl->vif);
		else
			ieee80211_enable_dyn_ps(wl->vif);
	}

	/*
	 * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
	 * filtering) is enabled. Without PSM, the stack will receive all
	 * beacons and can detect beacon loss by itself.
	 *
	 * As there's possibility that the driver disables PSM before receiving
	 * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
	 *
	 */
	if ((vector & BSS_LOSE_EVENT_ID) && !is_ap) {
		wl1271_info("Beacon loss detected.");

		/* indicate to the stack, that beacons have been lost */
		beacon_loss = true;
	}

	if ((vector & PS_REPORT_EVENT_ID) && !is_ap) {
		wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
		ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
		if (ret < 0)
			return ret;
	}

	if ((vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID) && !is_ap)
		wl1271_event_pspoll_delivery_fail(wl);

	if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
		wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
		if (wl->vif)
			wl1271_event_rssi_trigger(wl, mbox);
	}

	if ((vector & DUMMY_PACKET_EVENT_ID) && !is_ap) {
		wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
		if (wl->vif)
			wl1271_tx_dummy_packet(wl);
	}

	/*
	 * "TX retries exceeded" has a different meaning according to mode.
	 * In AP mode the offending station is disconnected. In STA mode we
	 * report connection loss.
	 */
	if (vector & MAX_TX_RETRY_EVENT_ID) {
		wl1271_debug(DEBUG_EVENT, "MAX_TX_RETRY_EVENT_ID");
		if (is_ap) {
			sta_bitmap |= le16_to_cpu(mbox->sta_tx_retry_exceeded);
			disconnect_sta = true;
		} else {
			beacon_loss = true;
		}
	}

	if ((vector & INACTIVE_STA_EVENT_ID) && is_ap) {
		wl1271_debug(DEBUG_EVENT, "INACTIVE_STA_EVENT_ID");
		sta_bitmap |= le16_to_cpu(mbox->sta_aging_status);
		disconnect_sta = true;
	}

	if (wl->vif && beacon_loss)
		ieee80211_connection_loss(wl->vif);

	if (is_ap && disconnect_sta) {
		u32 num_packets = wl->conf.tx.max_tx_retries;
		struct ieee80211_sta *sta;
		const u8 *addr;
		int h;

		for (h = find_first_bit(&sta_bitmap, AP_MAX_LINKS);
		     h < AP_MAX_LINKS;
		     h = find_next_bit(&sta_bitmap, AP_MAX_LINKS, h+1)) {
			if (!wl1271_is_active_sta(wl, h))
				continue;

			addr = wl->links[h].addr;

			rcu_read_lock();
			sta = ieee80211_find_sta(wl->vif, addr);
			if (sta) {
				wl1271_debug(DEBUG_EVENT, "remove sta %d", h);
				ieee80211_report_low_ack(sta, num_packets);
			}
			rcu_read_unlock();
		}
	}

	return 0;
}

int wl1271_event_unmask(struct wl1271 *wl)
{
	int ret;

	ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
	if (ret < 0)
		return ret;

	return 0;
}

void wl1271_event_mbox_config(struct wl1271 *wl)
{
	wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
	wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);

	wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
		     wl->mbox_ptr[0], wl->mbox_ptr[1]);
}

int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
{
	struct event_mailbox mbox;
	int ret;

	wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);

	if (mbox_num > 1)
		return -EINVAL;

	/* first we read the mbox descriptor */
	wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
		    sizeof(struct event_mailbox), false);

	/* process the descriptor */
	ret = wl1271_event_process(wl, &mbox);
	if (ret < 0)
		return ret;

	/* then we let the firmware know it can go on...*/
	wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);

	return 0;
}