release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/wireless/b43/rfkill.c

   1 /*
   2
   3   Broadcom B43 wireless driver
   4   RFKILL support
   5
   6   Copyright (c) 2007 Michael Buesch <mb@bu3sch.de>
   7
   8   This program is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; see the file COPYING.  If not, write to
  20   the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  21   Boston, MA 02110-1301, USA.
  22
  23 */
  24
  25 #include "b43.h"
  26
  27
  28 /* Returns TRUE, if the radio is enabled in hardware. */
  29 bool b43_is_hw_radio_enabled(struct b43_wldev *dev)
  30 {
  31         if (dev->phy.rev >= 3 || dev->phy.type == B43_PHYTYPE_LP) {
  32                 if (!(b43_read32(dev, B43_MMIO_RADIO_HWENABLED_HI)
  33                       & B43_MMIO_RADIO_HWENABLED_HI_MASK))
  34                         return 1;
  35         } else {
  36                 /* To prevent CPU fault on PPC, do not read a register
  37                  * unless the interface is started; however, on resume
  38                  * for hibernation, this routine is entered early. When
  39                  * that happens, unconditionally return TRUE.
  40                  */
  41                 if (b43_status(dev) < B43_STAT_STARTED)
  42                         return 1;
  43                 if (b43_read16(dev, B43_MMIO_RADIO_HWENABLED_LO)
  44                     & B43_MMIO_RADIO_HWENABLED_LO_MASK)
  45                         return 1;
  46         }
  47         return 0;
  48 }
  49
  50 /* The poll callback for the hardware button. */
  51 void b43_rfkill_poll(struct ieee80211_hw *hw)
  52 {
  53         struct b43_wl *wl = hw_to_b43_wl(hw);
  54         struct b43_wldev *dev = wl->current_dev;
  55         struct ssb_bus *bus = dev->dev->bus;
  56         bool enabled;
  57         bool brought_up = false;
  58
  59         mutex_lock(&wl->mutex);
  60         if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED)) {
  61                 if (ssb_bus_powerup(bus, 0)) {
  62                         mutex_unlock(&wl->mutex);
  63                         return;
  64                 }
  65                 ssb_device_enable(dev->dev, 0);
  66                 brought_up = true;
  67         }
  68
  69         enabled = b43_is_hw_radio_enabled(dev);
  70
  71         if (unlikely(enabled != dev->radio_hw_enable)) {
  72                 dev->radio_hw_enable = enabled;
  73                 b43info(wl, "Radio hardware status changed to %s\n",
  74                         enabled ? "ENABLED" : "DISABLED");
  75                 wiphy_rfkill_set_hw_state(hw->wiphy, !enabled);
  76                 if (enabled != dev->phy.radio_on)
  77                         b43_software_rfkill(dev, !enabled);
  78         }
  79
  80         if (brought_up) {
  81                 ssb_device_disable(dev->dev, 0);
  82                 ssb_bus_may_powerdown(bus);
  83         }
  84
  85         mutex_unlock(&wl->mutex);
  86 }