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}
79