1 /*
2
3 Broadcom B43 wireless driver
4 RFKILL support
5
6 Copyright (c) 2007 Michael Buesch <mb@bu3sch.de>
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 "rfkill.h"
26 #include "radio.h"
27 #include "b43legacy.h"
28
29 #include <linux/kmod.h>
30
31
32 /* Returns TRUE, if the radio is enabled in hardware. */
33 static bool b43legacy_is_hw_radio_enabled(struct b43legacy_wldev *dev)
34 {
35 if (dev->phy.rev >= 3) {
36 if (!(b43legacy_read32(dev, B43legacy_MMIO_RADIO_HWENABLED_HI)
37 & B43legacy_MMIO_RADIO_HWENABLED_HI_MASK))
38 return 1;
39 } else {
40 if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO)
41 & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK)
42 return 1;
43 }
44 return 0;
45 }
46
47 /* The poll callback for the hardware button. */
48 static void b43legacy_rfkill_poll(struct input_polled_dev *poll_dev)
49 {
50 struct b43legacy_wldev *dev = poll_dev->private;
51 struct b43legacy_wl *wl = dev->wl;
52 bool enabled;
53 bool report_change = 0;
54
55 mutex_lock(&wl->mutex);
56 if (unlikely(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)) {
57 mutex_unlock(&wl->mutex);
58 return;
59 }
60 enabled = b43legacy_is_hw_radio_enabled(dev);
61 if (unlikely(enabled != dev->radio_hw_enable)) {
62 dev->radio_hw_enable = enabled;
63 report_change = 1;
64 b43legacyinfo(wl, "Radio hardware status changed to %s\n",
65 enabled ? "ENABLED" : "DISABLED");
66 }
67 mutex_unlock(&wl->mutex);
68
69 /* send the radio switch event to the system - note both a key press
70 * and a release are required */
71 if (unlikely(report_change)) {
72 input_report_key(poll_dev->input, KEY_WLAN, 1);
73 input_report_key(poll_dev->input, KEY_WLAN, 0);
74 }
75 }
76
77 /* Called when the RFKILL toggled in software.
78 * This is called without locking. */
79 static int b43legacy_rfkill_soft_toggle(void *data, enum rfkill_state state)
80 {
81 struct b43legacy_wldev *dev = data;
82 struct b43legacy_wl *wl = dev->wl;
83 int err = -EBUSY;
84
85 if (!wl->rfkill.registered)
86 return 0;
87
88 mutex_lock(&wl->mutex);
89 if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)
90 goto out_unlock;
91 err = 0;
92 switch (state) {
93 case RFKILL_STATE_ON:
94 if (!dev->radio_hw_enable) {
95 /* No luck. We can't toggle the hardware RF-kill
96 * button from software. */
97 err = -EBUSY;
98 goto out_unlock;
99 }
100 if (!dev->phy.radio_on)
101 b43legacy_radio_turn_on(dev);
102 break;
103 case RFKILL_STATE_OFF:
104 if (dev->phy.radio_on)
105 b43legacy_radio_turn_off(dev, 0);
106 break;
107 }
108
109 out_unlock:
110 mutex_unlock(&wl->mutex);
111
112 return err;
113 }
114
115 char *b43legacy_rfkill_led_name(struct b43legacy_wldev *dev)
116 {
117 struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
118
119 if (!rfk->registered)
120 return NULL;
121 return rfkill_get_led_name(rfk->rfkill);
122 }
123
124 void b43legacy_rfkill_init(struct b43legacy_wldev *dev)
125 {
126 struct b43legacy_wl *wl = dev->wl;
127 struct b43legacy_rfkill *rfk = &(wl->rfkill);
128 int err;
129
130 rfk->registered = 0;
131
132 rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
133 if (!rfk->rfkill)
134 goto out_error;
135 snprintf(rfk->name, sizeof(rfk->name),
136 "b43legacy-%s", wiphy_name(wl->hw->wiphy));
137 rfk->rfkill->name = rfk->name;
138 rfk->rfkill->state = RFKILL_STATE_ON;
139 rfk->rfkill->data = dev;
140 rfk->rfkill->toggle_radio = b43legacy_rfkill_soft_toggle;
141 rfk->rfkill->user_claim_unsupported = 1;
142
143 rfk->poll_dev = input_allocate_polled_device();
144 if (!rfk->poll_dev) {
145 rfkill_free(rfk->rfkill);
146 goto err_freed_rfk;
147 }
148
149 rfk->poll_dev->private = dev;
150 rfk->poll_dev->poll = b43legacy_rfkill_poll;
151 rfk->poll_dev->poll_interval = 1000; /* msecs */
152
153 rfk->poll_dev->input->name = rfk->name;
154 rfk->poll_dev->input->id.bustype = BUS_HOST;
155 rfk->poll_dev->input->id.vendor = dev->dev->bus->boardinfo.vendor;
156 rfk->poll_dev->input->evbit[0] = BIT(EV_KEY);
157 set_bit(KEY_WLAN, rfk->poll_dev->input->keybit);
158
159 err = rfkill_register(rfk->rfkill);
160 if (err)
161 goto err_free_polldev;
162
163 #ifdef CONFIG_RFKILL_INPUT_MODULE
164 /* B43legacy RF-kill isn't useful without the rfkill-input subsystem.
165 * Try to load the module. */
166 err = request_module("rfkill-input");
167 if (err)
168 b43legacywarn(wl, "Failed to load the rfkill-input module."
169 "The built-in radio LED will not work.\n");
170 #endif /* CONFIG_RFKILL_INPUT */
171
172 err = input_register_polled_device(rfk->poll_dev);
173 if (err)
174 goto err_unreg_rfk;
175
176 rfk->registered = 1;
177
178 return;
179 err_unreg_rfk:
180 rfkill_unregister(rfk->rfkill);
181 err_free_polldev:
182 input_free_polled_device(rfk->poll_dev);
183 rfk->poll_dev = NULL;
184 err_freed_rfk:
185 rfk->rfkill = NULL;
186 out_error:
187 rfk->registered = 0;
188 b43legacywarn(wl, "RF-kill button init failed\n");
189 }
190
191 void b43legacy_rfkill_exit(struct b43legacy_wldev *dev)
192 {
193 struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
194
195 if (!rfk->registered)
196 return;
197 rfk->registered = 0;
198
199 input_unregister_polled_device(rfk->poll_dev);
200 rfkill_unregister(rfk->rfkill);
201 input_free_polled_device(rfk->poll_dev);
202 rfk->poll_dev = NULL;
203 rfk->rfkill = NULL;
204 }
205
206
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