Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
[linux-2.6] / drivers / net / wireless / b43 / 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 "b43.h"
27 #include "phy_common.h"
28
29 #include <linux/kmod.h>
30
31
32 /* Returns TRUE, if the radio is enabled in hardware. */
33 static bool b43_is_hw_radio_enabled(struct b43_wldev *dev)
34 {
35         if (dev->phy.rev >= 3) {
36                 if (!(b43_read32(dev, B43_MMIO_RADIO_HWENABLED_HI)
37                       & B43_MMIO_RADIO_HWENABLED_HI_MASK))
38                         return 1;
39         } else {
40                 if (b43_read16(dev, B43_MMIO_RADIO_HWENABLED_LO)
41                     & B43_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 b43_rfkill_poll(struct input_polled_dev *poll_dev)
49 {
50         struct b43_wldev *dev = poll_dev->private;
51         struct b43_wl *wl = dev->wl;
52         bool enabled;
53         bool report_change = 0;
54
55         mutex_lock(&wl->mutex);
56         if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED)) {
57                 mutex_unlock(&wl->mutex);
58                 return;
59         }
60         enabled = b43_is_hw_radio_enabled(dev);
61         if (unlikely(enabled != dev->radio_hw_enable)) {
62                 dev->radio_hw_enable = enabled;
63                 report_change = 1;
64                 b43info(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 static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state)
79 {
80         struct b43_wldev *dev = data;
81         struct b43_wl *wl = dev->wl;
82         int err = -EBUSY;
83
84         if (!wl->rfkill.registered)
85                 return 0;
86
87         mutex_lock(&wl->mutex);
88         if (b43_status(dev) < B43_STAT_INITIALIZED)
89                 goto out_unlock;
90         err = 0;
91         switch (state) {
92         case RFKILL_STATE_UNBLOCKED:
93                 if (!dev->radio_hw_enable) {
94                         /* No luck. We can't toggle the hardware RF-kill
95                          * button from software. */
96                         err = -EBUSY;
97                         goto out_unlock;
98                 }
99                 if (!dev->phy.radio_on)
100                         b43_software_rfkill(dev, state);
101                 break;
102         case RFKILL_STATE_SOFT_BLOCKED:
103                 if (dev->phy.radio_on)
104                         b43_software_rfkill(dev, state);
105                 break;
106         default:
107                 b43warn(wl, "Received unexpected rfkill state %d.\n", state);
108                 break;
109         }
110 out_unlock:
111         mutex_unlock(&wl->mutex);
112
113         return err;
114 }
115
116 char *b43_rfkill_led_name(struct b43_wldev *dev)
117 {
118         struct b43_rfkill *rfk = &(dev->wl->rfkill);
119
120         if (!rfk->registered)
121                 return NULL;
122         return rfkill_get_led_name(rfk->rfkill);
123 }
124
125 void b43_rfkill_init(struct b43_wldev *dev)
126 {
127         struct b43_wl *wl = dev->wl;
128         struct b43_rfkill *rfk = &(wl->rfkill);
129         int err;
130
131         rfk->registered = 0;
132
133         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
134         if (!rfk->rfkill)
135                 goto out_error;
136         snprintf(rfk->name, sizeof(rfk->name),
137                  "b43-%s", wiphy_name(wl->hw->wiphy));
138         rfk->rfkill->name = rfk->name;
139         rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
140         rfk->rfkill->data = dev;
141         rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
142         rfk->rfkill->user_claim_unsupported = 1;
143
144         rfk->poll_dev = input_allocate_polled_device();
145         if (!rfk->poll_dev) {
146                 rfkill_free(rfk->rfkill);
147                 goto err_freed_rfk;
148         }
149
150         rfk->poll_dev->private = dev;
151         rfk->poll_dev->poll = b43_rfkill_poll;
152         rfk->poll_dev->poll_interval = 1000; /* msecs */
153
154         rfk->poll_dev->input->name = rfk->name;
155         rfk->poll_dev->input->id.bustype = BUS_HOST;
156         rfk->poll_dev->input->id.vendor = dev->dev->bus->boardinfo.vendor;
157         rfk->poll_dev->input->evbit[0] = BIT(EV_KEY);
158         set_bit(KEY_WLAN, rfk->poll_dev->input->keybit);
159
160         err = rfkill_register(rfk->rfkill);
161         if (err)
162                 goto err_free_polldev;
163
164 #ifdef CONFIG_RFKILL_INPUT_MODULE
165         /* B43 RF-kill isn't useful without the rfkill-input subsystem.
166          * Try to load the module. */
167         err = request_module("rfkill-input");
168         if (err)
169                 b43warn(wl, "Failed to load the rfkill-input module. "
170                         "The built-in radio LED will not work.\n");
171 #endif /* CONFIG_RFKILL_INPUT */
172
173 #if !defined(CONFIG_RFKILL_INPUT) && !defined(CONFIG_RFKILL_INPUT_MODULE)
174         b43warn(wl, "The rfkill-input subsystem is not available. "
175                 "The built-in radio LED will not work.\n");
176 #endif
177
178         err = input_register_polled_device(rfk->poll_dev);
179         if (err)
180                 goto err_unreg_rfk;
181
182         rfk->registered = 1;
183
184         return;
185 err_unreg_rfk:
186         rfkill_unregister(rfk->rfkill);
187 err_free_polldev:
188         input_free_polled_device(rfk->poll_dev);
189         rfk->poll_dev = NULL;
190 err_freed_rfk:
191         rfk->rfkill = NULL;
192 out_error:
193         rfk->registered = 0;
194         b43warn(wl, "RF-kill button init failed\n");
195 }
196
197 void b43_rfkill_exit(struct b43_wldev *dev)
198 {
199         struct b43_rfkill *rfk = &(dev->wl->rfkill);
200
201         if (!rfk->registered)
202                 return;
203         rfk->registered = 0;
204
205         input_unregister_polled_device(rfk->poll_dev);
206         rfkill_unregister(rfk->rfkill);
207         input_free_polled_device(rfk->poll_dev);
208         rfk->poll_dev = NULL;
209         rfk->rfkill = NULL;
210 }