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 "b43.h"
13 
14 
15 /* Returns TRUE, if the radio is enabled in hardware. */
16 bool b43_is_hw_radio_enabled(struct b43_wldev *dev)
17 {
18 	return !(b43_read32(dev, B43_MMIO_RADIO_HWENABLED_HI)
19 		& B43_MMIO_RADIO_HWENABLED_HI_MASK);
20 }
21 
22 /* The poll callback for the hardware button. */
23 void b43_rfkill_poll(struct ieee80211_hw *hw)
24 {
25 	struct b43_wl *wl = hw_to_b43_wl(hw);
26 	struct b43_wldev *dev = wl->current_dev;
27 	bool enabled;
28 	bool brought_up = false;
29 
30 	mutex_lock(&wl->mutex);
31 	if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED)) {
32 		if (b43_bus_powerup(dev, 0)) {
33 			mutex_unlock(&wl->mutex);
34 			return;
35 		}
36 		b43_device_enable(dev, 0);
37 		brought_up = true;
38 	}
39 
40 	enabled = b43_is_hw_radio_enabled(dev);
41 
42 	if (unlikely(enabled != dev->radio_hw_enable)) {
43 		dev->radio_hw_enable = enabled;
44 		b43info(wl, "Radio hardware status changed to %s\n",
45 			enabled ? "ENABLED" : "DISABLED");
46 		wiphy_rfkill_set_hw_state(hw->wiphy, !enabled);
47 		if (enabled != dev->phy.radio_on)
48 			b43_software_rfkill(dev, !enabled);
49 	}
50 
51 	if (brought_up) {
52 		b43_device_disable(dev, 0);
53 		b43_bus_may_powerdown(dev);
54 	}
55 
56 	mutex_unlock(&wl->mutex);
57 }
58