rfkill.c

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/*

  Broadcom B43 wireless driver
  RFKILL support

  Copyright (c) 2007 Michael Buesch <[email protected]>

  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 "radio.h"
#include "b43legacy.h"


/* Returns TRUE, if the radio is enabled in hardware. */
bool b43legacy_is_hw_radio_enabled(struct b43legacy_wldev *dev)
{
    if (dev->dev->id.revision >= 3) {
        if (!(b43legacy_read32(dev, B43legacy_MMIO_RADIO_HWENABLED_HI)
              & B43legacy_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 (b43legacy_status(dev) < B43legacy_STAT_STARTED)
            return 1;
        if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO)
            & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK)
            return 1;
    }
    return 0;
}

/* The poll callback for the hardware button. */
void b43legacy_rfkill_poll(struct ieee80211_hw *hw)
{
    struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
    struct b43legacy_wldev *dev = wl->current_dev;
    struct ssb_bus *bus = dev->dev->bus;
    bool enabled;
    bool brought_up = false;

    mutex_lock(&wl->mutex);
    if (unlikely(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)) {
        if (ssb_bus_powerup(bus, 0)) {
            mutex_unlock(&wl->mutex);
            return;
        }
        ssb_device_enable(dev->dev, 0);
        brought_up = true;
    }

    enabled = b43legacy_is_hw_radio_enabled(dev);

    if (unlikely(enabled != dev->radio_hw_enable)) {
        dev->radio_hw_enable = enabled;
        b43legacyinfo(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) {
            if (enabled)
                b43legacy_radio_turn_on(dev);
            else
                b43legacy_radio_turn_off(dev, 0);
        }
    }

    if (brought_up) {
        ssb_device_disable(dev->dev, 0);
        ssb_bus_may_powerdown(bus);
    }

    mutex_unlock(&wl->mutex);
}