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