drivers/net/wireless/broadcom/b43legacy/rfkill.c

   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 }