cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rfkill.c (1992B)

      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. */
     17bool 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. */
     39void 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}