broadcom/b43legacy/rfkill.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003
0004   Broadcom B43 wireless driver
0005   RFKILL support
0006
0007   Copyright (c) 2007 Michael Buesch <m@bues.ch>
0008
0009
0010 */
0011
0012 #include "radio.h"
0013 #include "b43legacy.h"
0014
0015
0016 /* Returns TRUE, if the radio is enabled in hardware. */
0017 bool b43legacy_is_hw_radio_enabled(struct b43legacy_wldev *dev)
0018 {
0019     if (dev->dev->id.revision >= 3) {
0020         if (!(b43legacy_read32(dev, B43legacy_MMIO_RADIO_HWENABLED_HI)
0021               & B43legacy_MMIO_RADIO_HWENABLED_HI_MASK))
0022             return true;
0023     } else {
0024         /* To prevent CPU fault on PPC, do not read a register
0025          * unless the interface is started; however, on resume
0026          * for hibernation, this routine is entered early. When
0027          * that happens, unconditionally return TRUE.
0028          */
0029         if (b43legacy_status(dev) < B43legacy_STAT_STARTED)
0030             return true;
0031         if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO)
0032             & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK)
0033             return true;
0034     }
0035     return false;
0036 }
0037
0038 /* The poll callback for the hardware button. */
0039 void b43legacy_rfkill_poll(struct ieee80211_hw *hw)
0040 {
0041     struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
0042     struct b43legacy_wldev *dev = wl->current_dev;
0043     struct ssb_bus *bus = dev->dev->bus;
0044     bool enabled;
0045     bool brought_up = false;
0046
0047     mutex_lock(&wl->mutex);
0048     if (unlikely(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)) {
0049         if (ssb_bus_powerup(bus, 0)) {
0050             mutex_unlock(&wl->mutex);
0051             return;
0052         }
0053         ssb_device_enable(dev->dev, 0);
0054         brought_up = true;
0055     }
0056
0057     enabled = b43legacy_is_hw_radio_enabled(dev);
0058
0059     if (unlikely(enabled != dev->radio_hw_enable)) {
0060         dev->radio_hw_enable = enabled;
0061         b43legacyinfo(wl, "Radio hardware status changed to %s\n",
0062             enabled ? "ENABLED" : "DISABLED");
0063         wiphy_rfkill_set_hw_state(hw->wiphy, !enabled);
0064         if (enabled != dev->phy.radio_on) {
0065             if (enabled)
0066                 b43legacy_radio_turn_on(dev);
0067             else
0068                 b43legacy_radio_turn_off(dev, 0);
0069         }
0070     }
0071
0072     if (brought_up) {
0073         ssb_device_disable(dev->dev, 0);
0074         ssb_bus_may_powerdown(bus);
0075     }
0076
0077     mutex_unlock(&wl->mutex);
0078 }