// SPDX-License-Identifier: GPL-2.0-or-later
/*

  Broadcom B43 wireless driver
  RFKILL support

  Copyright (c) 2007 Michael Buesch <m@bues.ch>


*/

#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 true;
        } 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 true;
                if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO)
                    & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK)
                        return true;
        }
        return false;
}

/* 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);
}