1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 4 Broadcom B43 wireless driver 5 RFKILL support 6 7 Copyright (c) 2007 Michael Buesch <m@bues.ch> 8 9 10 */ 11 12 #include "radio.h" 13 #include "b43legacy.h" 14 15 16 /* Returns TRUE, if the radio is enabled in hardware. */ 17 bool b43legacy_is_hw_radio_enabled(struct b43legacy_wldev *dev) 18 { 19 if (dev->dev->id.revision >= 3) { 20 if (!(b43legacy_read32(dev, B43legacy_MMIO_RADIO_HWENABLED_HI) 21 & B43legacy_MMIO_RADIO_HWENABLED_HI_MASK)) 22 return true; 23 } else { 24 /* To prevent CPU fault on PPC, do not read a register 25 * unless the interface is started; however, on resume 26 * for hibernation, this routine is entered early. When 27 * that happens, unconditionally return TRUE. 28 */ 29 if (b43legacy_status(dev) < B43legacy_STAT_STARTED) 30 return true; 31 if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO) 32 & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK) 33 return true; 34 } 35 return false; 36 } 37 38 /* The poll callback for the hardware button. */ 39 void b43legacy_rfkill_poll(struct ieee80211_hw *hw) 40 { 41 struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw); 42 struct b43legacy_wldev *dev = wl->current_dev; 43 struct ssb_bus *bus = dev->dev->bus; 44 bool enabled; 45 bool brought_up = false; 46 47 mutex_lock(&wl->mutex); 48 if (unlikely(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)) { 49 if (ssb_bus_powerup(bus, 0)) { 50 mutex_unlock(&wl->mutex); 51 return; 52 } 53 ssb_device_enable(dev->dev, 0); 54 brought_up = true; 55 } 56 57 enabled = b43legacy_is_hw_radio_enabled(dev); 58 59 if (unlikely(enabled != dev->radio_hw_enable)) { 60 dev->radio_hw_enable = enabled; 61 b43legacyinfo(wl, "Radio hardware status changed to %s\n", 62 enabled ? "ENABLED" : "DISABLED"); 63 wiphy_rfkill_set_hw_state(hw->wiphy, !enabled); 64 if (enabled != dev->phy.radio_on) { 65 if (enabled) 66 b43legacy_radio_turn_on(dev); 67 else 68 b43legacy_radio_turn_off(dev, 0); 69 } 70 } 71 72 if (brought_up) { 73 ssb_device_disable(dev->dev, 0); 74 ssb_bus_may_powerdown(bus); 75 } 76 77 mutex_unlock(&wl->mutex); 78 } 79