summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/wl12xx/wl1271_event.c
blob: 7468ef10194bef9a1974f84b09036e3954a831ed (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
/*
 * 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 "wl1271.h"
#include "wl1271_reg.h"
#include "wl1271_spi.h"
#include "wl1271_io.h"
#include "wl1271_event.h"
#include "wl1271_ps.h"
#include "wl12xx_80211.h"

static int wl1271_event_scan_complete(struct wl1271 *wl,
				      struct event_mailbox *mbox)
{
	int size = sizeof(struct wl12xx_probe_req_template);
	wl1271_debug(DEBUG_EVENT, "status: 0x%x",
		     mbox->scheduled_scan_status);

	if (test_bit(WL1271_FLAG_SCANNING, &wl->flags)) {
		if (wl->scan.state == WL1271_SCAN_BAND_DUAL) {
			wl1271_cmd_template_set(wl, CMD_TEMPL_CFG_PROBE_REQ_2_4,
						NULL, size);
			/* 2.4 GHz band scanned, scan 5 GHz band, pretend
			 * to the wl1271_cmd_scan function that we are not
			 * scanning as it checks that.
			 */
			clear_bit(WL1271_FLAG_SCANNING, &wl->flags);
			wl1271_cmd_scan(wl, wl->scan.ssid, wl->scan.ssid_len,
						wl->scan.active,
						wl->scan.high_prio,
						WL1271_SCAN_BAND_5_GHZ,
						wl->scan.probe_requests);
		} else {
			if (wl->scan.state == WL1271_SCAN_BAND_2_4_GHZ)
				wl1271_cmd_template_set(wl,
						CMD_TEMPL_CFG_PROBE_REQ_2_4,
						NULL, size);
			else
				wl1271_cmd_template_set(wl,
						CMD_TEMPL_CFG_PROBE_REQ_5,
						NULL, size);

			mutex_unlock(&wl->mutex);
			ieee80211_scan_completed(wl->hw, false);
			mutex_lock(&wl->mutex);
			clear_bit(WL1271_FLAG_SCANNING, &wl->flags);
		}
	}
	return 0;
}

static int wl1271_event_ps_report(struct wl1271 *wl,
				  struct event_mailbox *mbox,
				  bool *beacon_loss)
{
	int ret = 0;

	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 < wl->conf.conn.psm_entry_retries) {
			wl->psm_entry_retry++;
			ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
						 true);
		} else {
			wl1271_error("PSM entry failed, giving up.\n");
			/* FIXME: this may need to be reconsidered. for now it
			   is not possible to indicate to the mac80211
			   afterwards that PSM entry failed. To maximize
			   functionality (receiving data and remaining
			   associated) make sure that we are in sync with the
			   AP in regard of PSM mode. */
			ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
						 false);
			wl->psm_entry_retry = 0;
		}
		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);
		if (ret < 0)
			break;

		/* go to extremely low power mode */
		wl1271_ps_elp_sleep(wl);
		if (ret < 0)
			break;
		break;
	case EVENT_EXIT_POWER_SAVE_FAIL:
		wl1271_debug(DEBUG_PSM, "PSM exit failed");

		if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
			wl->psm_entry_retry = 0;
			break;
		}

		/* make sure the firmware goes to active mode - the frame to
		   be sent next will indicate to the AP, that we are active. */
		ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
					 false);
		break;
	case EVENT_EXIT_POWER_SAVE_SUCCESS:
	default:
		break;
	}

	return ret;
}

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;

	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) {
		ret = wl1271_event_scan_complete(wl, mbox);
		if (ret < 0)
			return ret;
	}

	/*
	 * 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.
	 */
	if (vector & BSS_LOSE_EVENT_ID &&
	    test_bit(WL1271_FLAG_PSM, &wl->flags)) {
		wl1271_debug(DEBUG_EVENT, "BSS_LOSE_EVENT");

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

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

	if (wl->vif && beacon_loss) {
		/* Obviously, it's dangerous to release the mutex while
		   we are holding many of the variables in the wl struct.
		   That's why it's done last in the function, and care must
		   be taken that nothing more is done after this function
		   returns. */
		mutex_unlock(&wl->mutex);
		ieee80211_beacon_loss(wl->vif);
		mutex_lock(&wl->mutex);
	}

	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;
}