1 /*
2 * This file is part of wl1271
3 *
4 * Copyright (C) 2008-2009 Nokia Corporation
5 *
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 */
23
24 #include "wl12xx.h"
25 #include "reg.h"
26 #include "io.h"
27 #include "event.h"
28 #include "ps.h"
29 #include "scan.h"
30 #include "wl12xx_80211.h"
31
wl1271_pspoll_work(struct work_struct * work)32 void wl1271_pspoll_work(struct work_struct *work)
33 {
34 struct delayed_work *dwork;
35 struct wl1271 *wl;
36
37 dwork = container_of(work, struct delayed_work, work);
38 wl = container_of(dwork, struct wl1271, pspoll_work);
39
40 wl1271_debug(DEBUG_EVENT, "pspoll work");
41
42 mutex_lock(&wl->mutex);
43
44 if (unlikely(wl->state == WL1271_STATE_OFF))
45 goto out;
46
47 if (!test_and_clear_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags))
48 goto out;
49
50 if (!test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
51 goto out;
52
53 /*
54 * if we end up here, then we were in powersave when the pspoll
55 * delivery failure occurred, and no-one changed state since, so
56 * we should go back to powersave.
57 */
58 wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true);
59
60 out:
61 mutex_unlock(&wl->mutex);
62 };
63
wl1271_event_pspoll_delivery_fail(struct wl1271 * wl)64 static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl)
65 {
66 int delay = wl->conf.conn.ps_poll_recovery_period;
67 int ret;
68
69 wl->ps_poll_failures++;
70 if (wl->ps_poll_failures == 1)
71 wl1271_info("AP with dysfunctional ps-poll, "
72 "trying to work around it.");
73
74 /* force active mode receive data from the AP */
75 if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
76 ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
77 wl->basic_rate, true);
78 if (ret < 0)
79 return;
80 set_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags);
81 ieee80211_queue_delayed_work(wl->hw, &wl->pspoll_work,
82 msecs_to_jiffies(delay));
83 }
84
85 /*
86 * If already in active mode, lets we should be getting data from
87 * the AP right away. If we enter PSM too fast after this, and data
88 * remains on the AP, we will get another event like this, and we'll
89 * go into active once more.
90 */
91 }
92
wl1271_event_ps_report(struct wl1271 * wl,struct event_mailbox * mbox,bool * beacon_loss)93 static int wl1271_event_ps_report(struct wl1271 *wl,
94 struct event_mailbox *mbox,
95 bool *beacon_loss)
96 {
97 int ret = 0;
98 u32 total_retries = wl->conf.conn.psm_entry_retries;
99
100 wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);
101
102 switch (mbox->ps_status) {
103 case EVENT_ENTER_POWER_SAVE_FAIL:
104 wl1271_debug(DEBUG_PSM, "PSM entry failed");
105
106 if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
107 /* remain in active mode */
108 wl->psm_entry_retry = 0;
109 break;
110 }
111
112 if (wl->psm_entry_retry < total_retries) {
113 wl->psm_entry_retry++;
114 ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
115 wl->basic_rate, true);
116 } else {
117 wl1271_info("No ack to nullfunc from AP.");
118 wl->psm_entry_retry = 0;
119 *beacon_loss = true;
120 }
121 break;
122 case EVENT_ENTER_POWER_SAVE_SUCCESS:
123 wl->psm_entry_retry = 0;
124
125 /* enable beacon filtering */
126 ret = wl1271_acx_beacon_filter_opt(wl, true);
127 if (ret < 0)
128 break;
129
130 /* enable beacon early termination */
131 ret = wl1271_acx_bet_enable(wl, true);
132 if (ret < 0)
133 break;
134
135 /* go to extremely low power mode */
136 wl1271_ps_elp_sleep(wl);
137 break;
138 default:
139 break;
140 }
141
142 return ret;
143 }
144
wl1271_event_rssi_trigger(struct wl1271 * wl,struct event_mailbox * mbox)145 static void wl1271_event_rssi_trigger(struct wl1271 *wl,
146 struct event_mailbox *mbox)
147 {
148 enum nl80211_cqm_rssi_threshold_event event;
149 s8 metric = mbox->rssi_snr_trigger_metric[0];
150
151 wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
152
153 if (metric <= wl->rssi_thold)
154 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
155 else
156 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
157
158 if (event != wl->last_rssi_event)
159 ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
160 wl->last_rssi_event = event;
161 }
162
wl1271_event_mbox_dump(struct event_mailbox * mbox)163 static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
164 {
165 wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
166 wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
167 wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
168 }
169
wl1271_event_process(struct wl1271 * wl,struct event_mailbox * mbox)170 static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
171 {
172 int ret;
173 u32 vector;
174 bool beacon_loss = false;
175 bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
176
177 wl1271_event_mbox_dump(mbox);
178
179 vector = le32_to_cpu(mbox->events_vector);
180 vector &= ~(le32_to_cpu(mbox->events_mask));
181 wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
182
183 if (vector & SCAN_COMPLETE_EVENT_ID) {
184 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
185 mbox->scheduled_scan_status);
186
187 wl1271_scan_stm(wl);
188 }
189
190 /* disable dynamic PS when requested by the firmware */
191 if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
192 wl->bss_type == BSS_TYPE_STA_BSS) {
193 if (mbox->soft_gemini_sense_info)
194 ieee80211_disable_dyn_ps(wl->vif);
195 else
196 ieee80211_enable_dyn_ps(wl->vif);
197 }
198
199 /*
200 * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
201 * filtering) is enabled. Without PSM, the stack will receive all
202 * beacons and can detect beacon loss by itself.
203 *
204 * As there's possibility that the driver disables PSM before receiving
205 * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
206 *
207 */
208 if ((vector & BSS_LOSE_EVENT_ID) && !is_ap) {
209 wl1271_info("Beacon loss detected.");
210
211 /* indicate to the stack, that beacons have been lost */
212 beacon_loss = true;
213 }
214
215 if ((vector & PS_REPORT_EVENT_ID) && !is_ap) {
216 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
217 ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
218 if (ret < 0)
219 return ret;
220 }
221
222 if ((vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID) && !is_ap)
223 wl1271_event_pspoll_delivery_fail(wl);
224
225 if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
226 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
227 if (wl->vif)
228 wl1271_event_rssi_trigger(wl, mbox);
229 }
230
231 if (wl->vif && beacon_loss)
232 ieee80211_connection_loss(wl->vif);
233
234 return 0;
235 }
236
wl1271_event_unmask(struct wl1271 * wl)237 int wl1271_event_unmask(struct wl1271 *wl)
238 {
239 int ret;
240
241 ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
242 if (ret < 0)
243 return ret;
244
245 return 0;
246 }
247
wl1271_event_mbox_config(struct wl1271 * wl)248 void wl1271_event_mbox_config(struct wl1271 *wl)
249 {
250 wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
251 wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
252
253 wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
254 wl->mbox_ptr[0], wl->mbox_ptr[1]);
255 }
256
wl1271_event_handle(struct wl1271 * wl,u8 mbox_num)257 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
258 {
259 struct event_mailbox mbox;
260 int ret;
261
262 wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
263
264 if (mbox_num > 1)
265 return -EINVAL;
266
267 /* first we read the mbox descriptor */
268 wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
269 sizeof(struct event_mailbox), false);
270
271 /* process the descriptor */
272 ret = wl1271_event_process(wl, &mbox);
273 if (ret < 0)
274 return ret;
275
276 /* then we let the firmware know it can go on...*/
277 wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
278
279 return 0;
280 }
281