1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/net/wireless/broadcom/b43legacy/rfkill.c b/drivers/net/wireless/broadcom/b43legacy/rfkill.c
new file mode 100644
index 000000000..1f5321050
--- /dev/null
+++ b/drivers/net/wireless/broadcom/b43legacy/rfkill.c
@@ -0,0 +1,78 @@
+// 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);
+}