rfkill: rewrite
[linux-2.6] / drivers / net / wireless / b43legacy / rfkill.c
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 rfkill *rfkill, void *data)
49 {
50         struct b43legacy_wldev *dev = data;
51         struct b43legacy_wl *wl = dev->wl;
52         bool enabled;
53
54         mutex_lock(&wl->mutex);
55         if (unlikely(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)) {
56                 mutex_unlock(&wl->mutex);
57                 return;
58         }
59         enabled = b43legacy_is_hw_radio_enabled(dev);
60         if (unlikely(enabled != dev->radio_hw_enable)) {
61                 dev->radio_hw_enable = enabled;
62                 b43legacyinfo(wl, "Radio hardware status changed to %s\n",
63                         enabled ? "ENABLED" : "DISABLED");
64                 enabled = !rfkill_set_hw_state(rfkill, !enabled);
65                 if (enabled != dev->phy.radio_on) {
66                         if (enabled)
67                                 b43legacy_radio_turn_on(dev);
68                         else
69                                 b43legacy_radio_turn_off(dev, 0);
70                 }
71         }
72         mutex_unlock(&wl->mutex);
73 }
74
75 /* Called when the RFKILL toggled in software.
76  * This is called without locking. */
77 static int b43legacy_rfkill_soft_set(void *data, bool blocked)
78 {
79         struct b43legacy_wldev *dev = data;
80         struct b43legacy_wl *wl = dev->wl;
81         int ret = -EINVAL;
82
83         if (!wl->rfkill.registered)
84                 return -EINVAL;
85
86         mutex_lock(&wl->mutex);
87         if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)
88                 goto out_unlock;
89
90         if (!dev->radio_hw_enable)
91                 goto out_unlock;
92
93         if (!blocked != dev->phy.radio_on) {
94                 if (!blocked)
95                         b43legacy_radio_turn_on(dev);
96                 else
97                         b43legacy_radio_turn_off(dev, 0);
98         }
99         ret = 0;
100
101 out_unlock:
102         mutex_unlock(&wl->mutex);
103         return ret;
104 }
105
106 const char *b43legacy_rfkill_led_name(struct b43legacy_wldev *dev)
107 {
108         struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
109
110         if (!rfk->registered)
111                 return NULL;
112         return rfkill_get_led_trigger_name(rfk->rfkill);
113 }
114
115 static const struct rfkill_ops b43legacy_rfkill_ops = {
116         .set_block = b43legacy_rfkill_soft_set,
117         .poll = b43legacy_rfkill_poll,
118 };
119
120 void b43legacy_rfkill_init(struct b43legacy_wldev *dev)
121 {
122         struct b43legacy_wl *wl = dev->wl;
123         struct b43legacy_rfkill *rfk = &(wl->rfkill);
124         int err;
125
126         rfk->registered = 0;
127
128         snprintf(rfk->name, sizeof(rfk->name),
129                  "b43legacy-%s", wiphy_name(wl->hw->wiphy));
130         rfk->rfkill = rfkill_alloc(rfk->name,
131                                    dev->dev->dev,
132                                    RFKILL_TYPE_WLAN,
133                                    &b43legacy_rfkill_ops, dev);
134         if (!rfk->rfkill)
135                 goto out_error;
136
137         err = rfkill_register(rfk->rfkill);
138         if (err)
139                 goto err_free;
140
141         rfk->registered = 1;
142
143         return;
144  err_free:
145         rfkill_destroy(rfk->rfkill);
146  out_error:
147         rfk->registered = 0;
148         b43legacywarn(wl, "RF-kill button init failed\n");
149 }
150
151 void b43legacy_rfkill_exit(struct b43legacy_wldev *dev)
152 {
153         struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
154
155         if (!rfk->registered)
156                 return;
157         rfk->registered = 0;
158
159         rfkill_unregister(rfk->rfkill);
160         rfkill_destroy(rfk->rfkill);
161         rfk->rfkill = NULL;
162 }
163