tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 "b43.h"
27
28#include <linux/kmod.h>
29
30
31/* Returns TRUE, if the radio is enabled in hardware. */
32static bool b43_is_hw_radio_enabled(struct b43_wldev *dev)
33{
34 if (dev->phy.rev >= 3) {
35 if (!(b43_read32(dev, B43_MMIO_RADIO_HWENABLED_HI)
36 & B43_MMIO_RADIO_HWENABLED_HI_MASK))
37 return 1;
38 } else {
39 if (b43_read16(dev, B43_MMIO_RADIO_HWENABLED_LO)
40 & B43_MMIO_RADIO_HWENABLED_LO_MASK)
41 return 1;
42 }
43 return 0;
44}
45
46/* The poll callback for the hardware button. */
47static void b43_rfkill_poll(struct input_polled_dev *poll_dev)
48{
49 struct b43_wldev *dev = poll_dev->private;
50 struct b43_wl *wl = dev->wl;
51 bool enabled;
52 bool report_change = 0;
53
54 mutex_lock(&wl->mutex);
55 if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED)) {
56 mutex_unlock(&wl->mutex);
57 return;
58 }
59 enabled = b43_is_hw_radio_enabled(dev);
60 if (unlikely(enabled != dev->radio_hw_enable)) {
61 dev->radio_hw_enable = enabled;
62 report_change = 1;
63 b43info(wl, "Radio hardware status changed to %s\n",
64 enabled ? "ENABLED" : "DISABLED");
65 }
66 mutex_unlock(&wl->mutex);
67
68 /* send the radio switch event to the system - note both a key press
69 * and a release are required */
70 if (unlikely(report_change)) {
71 input_report_key(poll_dev->input, KEY_WLAN, 1);
72 input_report_key(poll_dev->input, KEY_WLAN, 0);
73 }
74}
75
76/* Called when the RFKILL toggled in software. */
77static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state)
78{
79 struct b43_wldev *dev = data;
80 struct b43_wl *wl = dev->wl;
81 int err = -EBUSY;
82
83 if (!wl->rfkill.registered)
84 return 0;
85
86 mutex_lock(&wl->mutex);
87 if (b43_status(dev) < B43_STAT_INITIALIZED)
88 goto out_unlock;
89 err = 0;
90 switch (state) {
91 case RFKILL_STATE_ON:
92 if (!dev->radio_hw_enable) {
93 /* No luck. We can't toggle the hardware RF-kill
94 * button from software. */
95 err = -EBUSY;
96 goto out_unlock;
97 }
98 if (!dev->phy.radio_on)
99 b43_radio_turn_on(dev);
100 break;
101 case RFKILL_STATE_OFF:
102 if (dev->phy.radio_on)
103 b43_radio_turn_off(dev, 0);
104 break;
105 }
106out_unlock:
107 mutex_unlock(&wl->mutex);
108
109 return err;
110}
111
112char * b43_rfkill_led_name(struct b43_wldev *dev)
113{
114 struct b43_rfkill *rfk = &(dev->wl->rfkill);
115
116 if (!rfk->registered)
117 return NULL;
118 return rfkill_get_led_name(rfk->rfkill);
119}
120
121void b43_rfkill_init(struct b43_wldev *dev)
122{
123 struct b43_wl *wl = dev->wl;
124 struct b43_rfkill *rfk = &(wl->rfkill);
125 int err;
126
127 rfk->registered = 0;
128
129 rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
130 if (!rfk->rfkill)
131 goto out_error;
132 snprintf(rfk->name, sizeof(rfk->name),
133 "b43-%s", wiphy_name(wl->hw->wiphy));
134 rfk->rfkill->name = rfk->name;
135 rfk->rfkill->state = RFKILL_STATE_ON;
136 rfk->rfkill->data = dev;
137 rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
138 rfk->rfkill->user_claim_unsupported = 1;
139
140 rfk->poll_dev = input_allocate_polled_device();
141 if (!rfk->poll_dev) {
142 rfkill_free(rfk->rfkill);
143 goto err_freed_rfk;
144 }
145
146 rfk->poll_dev->private = dev;
147 rfk->poll_dev->poll = b43_rfkill_poll;
148 rfk->poll_dev->poll_interval = 1000; /* msecs */
149
150 rfk->poll_dev->input->name = rfk->name;
151 rfk->poll_dev->input->id.bustype = BUS_HOST;
152 rfk->poll_dev->input->id.vendor = dev->dev->bus->boardinfo.vendor;
153 rfk->poll_dev->input->evbit[0] = BIT(EV_KEY);
154 set_bit(KEY_WLAN, rfk->poll_dev->input->keybit);
155
156 err = rfkill_register(rfk->rfkill);
157 if (err)
158 goto err_free_polldev;
159
160#ifdef CONFIG_RFKILL_INPUT_MODULE
161 /* B43 RF-kill isn't useful without the rfkill-input subsystem.
162 * Try to load the module. */
163 err = request_module("rfkill-input");
164 if (err)
165 b43warn(wl, "Failed to load the rfkill-input module. "
166 "The built-in radio LED will not work.\n");
167#endif /* CONFIG_RFKILL_INPUT */
168
169 err = input_register_polled_device(rfk->poll_dev);
170 if (err)
171 goto err_unreg_rfk;
172
173 rfk->registered = 1;
174
175 return;
176err_unreg_rfk:
177 rfkill_unregister(rfk->rfkill);
178err_free_polldev:
179 input_free_polled_device(rfk->poll_dev);
180 rfk->poll_dev = NULL;
181err_freed_rfk:
182 rfk->rfkill = NULL;
183out_error:
184 rfk->registered = 0;
185 b43warn(wl, "RF-kill button init failed\n");
186}
187
188void b43_rfkill_exit(struct b43_wldev *dev)
189{
190 struct b43_rfkill *rfk = &(dev->wl->rfkill);
191
192 if (!rfk->registered)
193 return;
194 rfk->registered = 0;
195
196 input_unregister_polled_device(rfk->poll_dev);
197 rfkill_unregister(rfk->rfkill);
198 input_free_polled_device(rfk->poll_dev);
199 rfk->poll_dev = NULL;
200 rfk->rfkill = NULL;
201}