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. */
b43legacy_is_hw_radio_enabled(struct b43legacy_wldev * dev)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. */
b43legacy_rfkill_poll(struct ieee80211_hw * hw)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