text: /*
  
    Broadcom B43 wireless driver
    RFKILL support
  
    Copyright (c) 2007 Michael Buesch <mb@bu3sch.de>
  
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
  
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
  
    You should have received a copy of the GNU General Public License
    along with this program; see the file COPYING.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
    Boston, MA 02110-1301, USA.
  
  */
  
  #include "b43.h"
  
  
  /* Returns TRUE, if the radio is enabled in hardware. */
  bool b43_is_hw_radio_enabled(struct b43_wldev *dev)
  {
  	if (dev->phy.rev >= 3 || dev->phy.type == B43_PHYTYPE_LP) {
  		if (!(b43_read32(dev, B43_MMIO_RADIO_HWENABLED_HI)
  		      & B43_MMIO_RADIO_HWENABLED_HI_MASK))
  			return 1;
  	} else {
  		/* To prevent CPU fault on PPC, do not read a register
  		 * unless the interface is started; however, on resume
  		 * for hibernation, this routine is entered early. When
  		 * that happens, unconditionally return TRUE.
  		 */
  		if (b43_status(dev) < B43_STAT_STARTED)
  			return 1;
  		if (b43_read16(dev, B43_MMIO_RADIO_HWENABLED_LO)
  		    & B43_MMIO_RADIO_HWENABLED_LO_MASK)
  			return 1;
  	}
  	return 0;
  }
  
  /* The poll callback for the hardware button. */
  void b43_rfkill_poll(struct ieee80211_hw *hw)
  {
  	struct b43_wl *wl = hw_to_b43_wl(hw);
  	struct b43_wldev *dev = wl->current_dev;
  	struct ssb_bus *bus = dev->dev->bus;
  	bool enabled;
  	bool brought_up = false;
  
  	mutex_lock(&wl->mutex);
  	if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED)) {
  		if (ssb_bus_powerup(bus, 0)) {
  			mutex_unlock(&wl->mutex);
  			return;
  		}
  		ssb_device_enable(dev->dev, 0);
  		brought_up = true;
  	}
  
  	enabled = b43_is_hw_radio_enabled(dev);
  
  	if (unlikely(enabled != dev->radio_hw_enable)) {
  		dev->radio_hw_enable = enabled;
  		b43info(wl, "Radio hardware status changed to %s\n",
  			enabled ? "ENABLED" : "DISABLED");
  		wiphy_rfkill_set_hw_state(hw->wiphy, !enabled);
  		if (enabled != dev->phy.radio_on)
  			b43_software_rfkill(dev, !enabled);
  	}
  
  	if (brought_up) {
  		ssb_device_disable(dev->dev, 0);
  		ssb_bus_may_powerdown(bus);
  	}
  
  	mutex_unlock(&wl->mutex);
  }
  