a52ff7aa131e0243f08972f3eae471a1cebb911f
[pandora-kernel.git] / drivers / net / wireless / wl1251 / ps.c
1 /*
2  * This file is part of wl1251
3  *
4  * Copyright (C) 2008 Nokia Corporation
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * version 2 as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * 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, write to the Free Software
17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18  * 02110-1301 USA
19  *
20  */
21
22 #include "reg.h"
23 #include "ps.h"
24 #include "cmd.h"
25 #include "io.h"
26
27 /* in ms */
28 #define WL1251_WAKEUP_TIMEOUT 100
29
30 void wl1251_elp_work(struct work_struct *work)
31 {
32         struct delayed_work *dwork;
33         struct wl1251 *wl;
34
35         dwork = container_of(work, struct delayed_work, work);
36         wl = container_of(dwork, struct wl1251, elp_work);
37
38         wl1251_debug(DEBUG_PSM, "elp work");
39
40         mutex_lock(&wl->mutex);
41
42         if (wl->elp || wl->station_mode == STATION_ACTIVE_MODE)
43                 goto out;
44
45         wl1251_debug(DEBUG_PSM, "chip to elp");
46         wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
47         wl->elp = true;
48
49 out:
50         mutex_unlock(&wl->mutex);
51 }
52
53 #define ELP_ENTRY_DELAY  5
54
55 /* Routines to toggle sleep mode while in ELP */
56 void wl1251_ps_elp_sleep(struct wl1251 *wl)
57 {
58         unsigned long delay;
59
60         if (wl->station_mode != STATION_ACTIVE_MODE) {
61                 delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
62                 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
63         }
64 }
65
66 int wl1251_ps_elp_wakeup(struct wl1251 *wl)
67 {
68         unsigned long timeout, start;
69         u32 elp_reg;
70
71         if (delayed_work_pending(&wl->elp_work))
72                 cancel_delayed_work(&wl->elp_work);
73
74         if (!wl->elp)
75                 return 0;
76
77         wl1251_debug(DEBUG_PSM, "waking up chip from elp");
78
79         start = jiffies;
80         timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);
81
82         wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
83
84         elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
85
86         /*
87          * FIXME: we should wait for irq from chip but, as a temporary
88          * solution to simplify locking, let's poll instead
89          */
90         while (!(elp_reg & ELPCTRL_WLAN_READY)) {
91                 if (time_after(jiffies, timeout)) {
92                         wl1251_error("elp wakeup timeout");
93                         return -ETIMEDOUT;
94                 }
95                 msleep(1);
96                 elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
97         }
98
99         wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
100                      jiffies_to_msecs(jiffies - start));
101
102         wl->elp = false;
103
104         return 0;
105 }
106
107 int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_station_mode mode)
108 {
109         int ret;
110
111         switch (mode) {
112         case STATION_POWER_SAVE_MODE:
113                 wl1251_debug(DEBUG_PSM, "entering psm");
114
115                 ret = wl1251_acx_wake_up_conditions(wl,
116                                                     WAKE_UP_EVENT_DTIM_BITMAP,
117                                                     wl->listen_int);
118                 if (ret < 0)
119                         return ret;
120
121 #if 0 /* problems seen on one router */
122                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
123                                             WL1251_DEFAULT_BET_CONSECUTIVE);
124                 if (ret < 0)
125                         return ret;
126 #endif
127
128                 ret = wl1251_cmd_ps_mode(wl, CHIP_POWER_SAVE_MODE);
129                 if (ret < 0)
130                         return ret;
131
132                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
133                 if (ret < 0)
134                         return ret;
135                 break;
136         case STATION_IDLE:
137                 wl1251_debug(DEBUG_PSM, "entering idle");
138
139                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
140                 if (ret < 0)
141                         return ret;
142
143                 ret = wl1251_cmd_disconnect(wl);
144                 if (ret < 0)
145                         return ret;
146                 break;
147         case STATION_ACTIVE_MODE:
148         default:
149                 wl1251_debug(DEBUG_PSM, "leaving psm");
150
151                 ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
152                 if (ret < 0)
153                         return ret;
154
155 #if 0
156                 /* disable BET */
157                 ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
158                                             WL1251_DEFAULT_BET_CONSECUTIVE);
159                 if (ret < 0)
160                         return ret;
161 #endif
162
163                 /* disable beacon filtering */
164                 ret = wl1251_acx_beacon_filter_opt(wl, false);
165                 if (ret < 0)
166                         return ret;
167
168                 ret = wl1251_acx_wake_up_conditions(wl,
169                                                     WAKE_UP_EVENT_DTIM_BITMAP,
170                                                     wl->listen_int);
171                 if (ret < 0)
172                         return ret;
173
174                 ret = wl1251_cmd_ps_mode(wl, CHIP_ACTIVE_MODE);
175                 if (ret < 0)
176                         return ret;
177
178                 break;
179         }
180         if (mode != wl->station_mode)
181                 wl->ps_transitioning = true;
182         wl->station_mode = mode;
183         wl->ps_change_jiffies = jiffies;
184
185         return ret;
186 }
187