LXR linux/drivers/net/wireless/b43legacy/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 "radio.h"
  26#include "b43legacy.h"
  27
  28
  29/* Returns TRUE, if the radio is enabled in hardware. */
  30bool 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 1;
  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 1;
  44                if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO)
  45                    & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK)
  46                        return 1;
  47        }
  48        return 0;
  49}
  50
  51/* The poll callback for the hardware button. */
  52void 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}
  92