Merge branch 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan...
[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 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_UNBLOCKED:
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_SOFT_BLOCKED:
104                 if (dev->phy.radio_on)
105                         b43legacy_radio_turn_off(dev, 0);
106                 break;
107         default:
108                 b43legacywarn(wl, "Received unexpected rfkill state %d.\n",
109                               state);
110                 break;
111         }
112
113 out_unlock:
114         mutex_unlock(&wl->mutex);
115
116         return err;
117 }
118
119 char *b43legacy_rfkill_led_name(struct b43legacy_wldev *dev)
120 {
121         struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
122
123         if (!rfk->registered)
124                 return NULL;
125         return rfkill_get_led_name(rfk->rfkill);
126 }
127
128 void b43legacy_rfkill_init(struct b43legacy_wldev *dev)
129 {
130         struct b43legacy_wl *wl = dev->wl;
131         struct b43legacy_rfkill *rfk = &(wl->rfkill);
132         int err;
133
134         rfk->registered = 0;
135
136         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
137         if (!rfk->rfkill)
138                 goto out_error;
139         snprintf(rfk->name, sizeof(rfk->name),
140                  "b43legacy-%s", wiphy_name(wl->hw->wiphy));
141         rfk->rfkill->name = rfk->name;
142         rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
143         rfk->rfkill->data = dev;
144         rfk->rfkill->toggle_radio = b43legacy_rfkill_soft_toggle;
145         rfk->rfkill->user_claim_unsupported = 1;
146
147         rfk->poll_dev = input_allocate_polled_device();
148         if (!rfk->poll_dev) {
149                 rfkill_free(rfk->rfkill);
150                 goto err_freed_rfk;
151         }
152
153         rfk->poll_dev->private = dev;
154         rfk->poll_dev->poll = b43legacy_rfkill_poll;
155         rfk->poll_dev->poll_interval = 1000; /* msecs */
156
157         rfk->poll_dev->input->name = rfk->name;
158         rfk->poll_dev->input->id.bustype = BUS_HOST;
159         rfk->poll_dev->input->id.vendor = dev->dev->bus->boardinfo.vendor;
160         rfk->poll_dev->input->evbit[0] = BIT(EV_KEY);
161         set_bit(KEY_WLAN, rfk->poll_dev->input->keybit);
162
163         err = rfkill_register(rfk->rfkill);
164         if (err)
165                 goto err_free_polldev;
166
167 #ifdef CONFIG_RFKILL_INPUT_MODULE
168         /* B43legacy RF-kill isn't useful without the rfkill-input subsystem.
169          * Try to load the module. */
170         err = request_module("rfkill-input");
171         if (err)
172                 b43legacywarn(wl, "Failed to load the rfkill-input module."
173                         "The built-in radio LED will not work.\n");
174 #endif /* CONFIG_RFKILL_INPUT */
175
176         err = input_register_polled_device(rfk->poll_dev);
177         if (err)
178                 goto err_unreg_rfk;
179
180         rfk->registered = 1;
181
182         return;
183 err_unreg_rfk:
184         rfkill_unregister(rfk->rfkill);
185 err_free_polldev:
186         input_free_polled_device(rfk->poll_dev);
187         rfk->poll_dev = NULL;
188 err_freed_rfk:
189         rfk->rfkill = NULL;
190 out_error:
191         rfk->registered = 0;
192         b43legacywarn(wl, "RF-kill button init failed\n");
193 }
194
195 void b43legacy_rfkill_exit(struct b43legacy_wldev *dev)
196 {
197         struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
198
199         if (!rfk->registered)
200                 return;
201         rfk->registered = 0;
202
203         input_unregister_polled_device(rfk->poll_dev);
204         rfkill_unregister(rfk->rfkill);
205         input_free_polled_device(rfk->poll_dev);
206         rfk->poll_dev = NULL;
207         rfk->rfkill = NULL;
208 }
209