1/*
2
3  Broadcom B43 wireless driver
4  RFKILL support
5
6  Copyright (c) 2007 Michael Buesch <m@bues.ch>
7
8  This program is free software; you can redistribute it and/or modify
9  it under the terms of the GNU General Public License as published by
10  the Free Software Foundation; either version 2 of the License, or
11  (at your option) any later version.
12
13  This program is distributed in the hope that it will be useful,
14  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  GNU General Public License for more details.
17
18  You should have received a copy of the GNU General Public License
19  along with this program; see the file COPYING.  If not, write to
20  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
21  Boston, MA 02110-1301, USA.
22
23*/
24
25#include "radio.h"
26#include "b43legacy.h"
27
28
29/* Returns TRUE, if the radio is enabled in hardware. */
30bool b43legacy_is_hw_radio_enabled(struct b43legacy_wldev *dev)
31{
32	if (dev->dev->id.revision >= 3) {
33		if (!(b43legacy_read32(dev, B43legacy_MMIO_RADIO_HWENABLED_HI)
34		      & B43legacy_MMIO_RADIO_HWENABLED_HI_MASK))
35			return true;
36	} else {
37		/* To prevent CPU fault on PPC, do not read a register
38		 * unless the interface is started; however, on resume
39		 * for hibernation, this routine is entered early. When
40		 * that happens, unconditionally return TRUE.
41		 */
42		if (b43legacy_status(dev) < B43legacy_STAT_STARTED)
43			return true;
44		if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO)
45		    & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK)
46			return true;
47	}
48	return false;
49}
50
51/* The poll callback for the hardware button. */
52void b43legacy_rfkill_poll(struct ieee80211_hw *hw)
53{
54	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
55	struct b43legacy_wldev *dev = wl->current_dev;
56	struct ssb_bus *bus = dev->dev->bus;
57	bool enabled;
58	bool brought_up = false;
59
60	mutex_lock(&wl->mutex);
61	if (unlikely(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)) {
62		if (ssb_bus_powerup(bus, 0)) {
63			mutex_unlock(&wl->mutex);
64			return;
65		}
66		ssb_device_enable(dev->dev, 0);
67		brought_up = true;
68	}
69
70	enabled = b43legacy_is_hw_radio_enabled(dev);
71
72	if (unlikely(enabled != dev->radio_hw_enable)) {
73		dev->radio_hw_enable = enabled;
74		b43legacyinfo(wl, "Radio hardware status changed to %s\n",
75			enabled ? "ENABLED" : "DISABLED");
76		wiphy_rfkill_set_hw_state(hw->wiphy, !enabled);
77		if (enabled != dev->phy.radio_on) {
78			if (enabled)
79				b43legacy_radio_turn_on(dev);
80			else
81				b43legacy_radio_turn_off(dev, 0);
82		}
83	}
84
85	if (brought_up) {
86		ssb_device_disable(dev->dev, 0);
87		ssb_bus_may_powerdown(bus);
88	}
89
90	mutex_unlock(&wl->mutex);
91}
92