drivers/net/wireless/b43legacy/rfkill.c

   1 /*
   2
   3   Broadcom B43 wireless driver
   4   RFKILL support
   5
   6   Copyright (c) 2007 Michael Buesch <m@bues.ch>
   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 "radio.h"
  26 #include "b43legacy.h"
  27
  28
  29 /* Returns TRUE, if the radio is enabled in hardware. */
  30 bool b43legacy_is_hw_radio_enabled(struct b43legacy_wldev *dev)
  31 {
  32         if (dev->dev->id.revision >= 3) {
  33                 if (!(b43legacy_read32(dev, B43legacy_MMIO_RADIO_HWENABLED_HI)
  34                       & B43legacy_MMIO_RADIO_HWENABLED_HI_MASK))
  35                         return true;
  36         } else {
  37                 /* To prevent CPU fault on PPC, do not read a register
  38                  * unless the interface is started; however, on resume
  39                  * for hibernation, this routine is entered early. When
  40                  * that happens, unconditionally return TRUE.
  41                  */
  42                 if (b43legacy_status(dev) < B43legacy_STAT_STARTED)
  43                         return true;
  44                 if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO)
  45                     & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK)
  46                         return true;
  47         }
  48         return false;
  49 }
  50
  51 /* The poll callback for the hardware button. */
  52 void b43legacy_rfkill_poll(struct ieee80211_hw *hw)
  53 {
  54         struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
  55         struct b43legacy_wldev *dev = wl->current_dev;
  56         struct ssb_bus *bus = dev->dev->bus;
  57         bool enabled;
  58         bool brought_up = false;
  59
  60         mutex_lock(&wl->mutex);
  61         if (unlikely(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)) {
  62                 if (ssb_bus_powerup(bus, 0)) {
  63                         mutex_unlock(&wl->mutex);
  64                         return;
  65                 }
  66                 ssb_device_enable(dev->dev, 0);
  67                 brought_up = true;
  68         }
  69
  70         enabled = b43legacy_is_hw_radio_enabled(dev);
  71
  72         if (unlikely(enabled != dev->radio_hw_enable)) {
  73                 dev->radio_hw_enable = enabled;
  74                 b43legacyinfo(wl, "Radio hardware status changed to %s\n",
  75                         enabled ? "ENABLED" : "DISABLED");
  76                 wiphy_rfkill_set_hw_state(hw->wiphy, !enabled);
  77                 if (enabled != dev->phy.radio_on) {
  78                         if (enabled)
  79                                 b43legacy_radio_turn_on(dev);
  80                         else
  81                                 b43legacy_radio_turn_off(dev, 0);
  82                 }
  83         }
  84
  85         if (brought_up) {
  86                 ssb_device_disable(dev->dev, 0);
  87                 ssb_bus_may_powerdown(bus);
  88         }
  89
  90         mutex_unlock(&wl->mutex);
  91 }