SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/net/wireless/wl12xx/wl1271_ps.c

   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 "wl1271_reg.h"
  25 #include "wl1271_ps.h"
  26 #include "wl1271_io.h"
  27
  28 #define WL1271_WAKEUP_TIMEOUT 500
  29
  30 void wl1271_elp_work(struct work_struct *work)
  31 {
  32         struct delayed_work *dwork;
  33         struct wl1271 *wl;
  34
  35         dwork = container_of(work, struct delayed_work, work);
  36         wl = container_of(dwork, struct wl1271, elp_work);
  37
  38         wl1271_debug(DEBUG_PSM, "elp work");
  39
  40         mutex_lock(&wl->mutex);
  41
  42         if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
  43             !test_bit(WL1271_FLAG_PSM, &wl->flags))
  44                 goto out;
  45
  46         wl1271_debug(DEBUG_PSM, "chip to elp");
  47         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
  48         set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
  49
  50 out:
  51         mutex_unlock(&wl->mutex);
  52 }
  53
  54 #define ELP_ENTRY_DELAY  5
  55
  56 /* Routines to toggle sleep mode while in ELP */
  57 void wl1271_ps_elp_sleep(struct wl1271 *wl)
  58 {
  59         if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
  60                 cancel_delayed_work(&wl->elp_work);
  61                 ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
  62                                         msecs_to_jiffies(ELP_ENTRY_DELAY));
  63         }
  64 }
  65
  66 int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
  67 {
  68         DECLARE_COMPLETION_ONSTACK(compl);
  69         unsigned long flags;
  70         int ret;
  71         u32 start_time = jiffies;
  72         bool pending = false;
  73
  74         if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
  75                 return 0;
  76
  77         wl1271_debug(DEBUG_PSM, "waking up chip from elp");
  78
  79         /*
  80          * The spinlock is required here to synchronize both the work and
  81          * the completion variable in one entity.
  82          */
  83         spin_lock_irqsave(&wl->wl_lock, flags);
  84         if (work_pending(&wl->irq_work) || chip_awake)
  85                 pending = true;
  86         else
  87                 wl->elp_compl = &compl;
  88         spin_unlock_irqrestore(&wl->wl_lock, flags);
  89
  90         wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
  91
  92         if (!pending) {
  93                 ret = wait_for_completion_timeout(
  94                         &compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
  95                 if (ret == 0) {
  96                         wl1271_error("ELP wakeup timeout!");
  97                         ret = -ETIMEDOUT;
  98                         goto err;
  99                 } else if (ret < 0) {
 100                         wl1271_error("ELP wakeup completion error.");
 101                         goto err;
 102                 }
 103         }
 104
 105         clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
 106
 107         wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
 108                      jiffies_to_msecs(jiffies - start_time));
 109         goto out;
 110
 111 err:
 112         spin_lock_irqsave(&wl->wl_lock, flags);
 113         wl->elp_compl = NULL;
 114         spin_unlock_irqrestore(&wl->wl_lock, flags);
 115         return ret;
 116
 117 out:
 118         return 0;
 119 }
 120
 121 int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
 122                        bool send)
 123 {
 124         int ret;
 125
 126         switch (mode) {
 127         case STATION_POWER_SAVE_MODE:
 128                 wl1271_debug(DEBUG_PSM, "entering psm");
 129
 130                 ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE, send);
 131                 if (ret < 0)
 132                         return ret;
 133
 134                 set_bit(WL1271_FLAG_PSM, &wl->flags);
 135                 break;
 136         case STATION_ACTIVE_MODE:
 137         default:
 138                 wl1271_debug(DEBUG_PSM, "leaving psm");
 139                 ret = wl1271_ps_elp_wakeup(wl, false);
 140                 if (ret < 0)
 141                         return ret;
 142
 143                 /* disable beacon early termination */
 144                 ret = wl1271_acx_bet_enable(wl, false);
 145                 if (ret < 0)
 146                         return ret;
 147
 148                 /* disable beacon filtering */
 149                 ret = wl1271_acx_beacon_filter_opt(wl, false);
 150                 if (ret < 0)
 151                         return ret;
 152
 153                 ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE, send);
 154                 if (ret < 0)
 155                         return ret;
 156
 157                 clear_bit(WL1271_FLAG_PSM, &wl->flags);
 158                 break;
 159         }
 160
 161         return ret;
 162 }
 163
 164