b43/b43legacy: add RFKILL_STATE_HARD_BLOCKED support
[linux-2.6.git] / 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
28 #include <linux/kmod.h>
29
30
31 /* Returns TRUE, if the radio is enabled in hardware. */
32 static 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 /* Update the rfkill state */
47 static void b43_rfkill_update_state(struct b43_wldev *dev)
48 {
49         struct b43_rfkill *rfk = &(dev->wl->rfkill);
50
51         if (!dev->radio_hw_enable) {
52                 rfk->rfkill->state = RFKILL_STATE_HARD_BLOCKED;
53                 return;
54         }
55
56         if (!dev->phy.radio_on)
57                 rfk->rfkill->state = RFKILL_STATE_SOFT_BLOCKED;
58         else
59                 rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
60
61 }
62
63 /* The poll callback for the hardware button. */
64 static void b43_rfkill_poll(struct input_polled_dev *poll_dev)
65 {
66         struct b43_wldev *dev = poll_dev->private;
67         struct b43_wl *wl = dev->wl;
68         bool enabled;
69         bool report_change = 0;
70
71         mutex_lock(&wl->mutex);
72         if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED)) {
73                 mutex_unlock(&wl->mutex);
74                 return;
75         }
76         enabled = b43_is_hw_radio_enabled(dev);
77         if (unlikely(enabled != dev->radio_hw_enable)) {
78                 dev->radio_hw_enable = enabled;
79                 report_change = 1;
80                 b43_rfkill_update_state(dev);
81                 b43info(wl, "Radio hardware status changed to %s\n",
82                         enabled ? "ENABLED" : "DISABLED");
83         }
84         mutex_unlock(&wl->mutex);
85
86         /* send the radio switch event to the system - note both a key press
87          * and a release are required */
88         if (unlikely(report_change)) {
89                 input_report_key(poll_dev->input, KEY_WLAN, 1);
90                 input_report_key(poll_dev->input, KEY_WLAN, 0);
91         }
92 }
93
94 /* Called when the RFKILL toggled in software. */
95 static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state)
96 {
97         struct b43_wldev *dev = data;
98         struct b43_wl *wl = dev->wl;
99         int err = -EBUSY;
100
101         if (!wl->rfkill.registered)
102                 return 0;
103
104         mutex_lock(&wl->mutex);
105         if (b43_status(dev) < B43_STAT_INITIALIZED)
106                 goto out_unlock;
107         err = 0;
108         switch (state) {
109         case RFKILL_STATE_UNBLOCKED:
110                 if (!dev->radio_hw_enable) {
111                         /* No luck. We can't toggle the hardware RF-kill
112                          * button from software. */
113                         err = -EBUSY;
114                         goto out_unlock;
115                 }
116                 if (!dev->phy.radio_on)
117                         b43_radio_turn_on(dev);
118                 break;
119         case RFKILL_STATE_SOFT_BLOCKED:
120                 if (dev->phy.radio_on)
121                         b43_radio_turn_off(dev, 0);
122                 break;
123         default:
124                 b43warn(wl, "Received unexpected rfkill state %d.\n", state);
125                 break;
126         }
127 out_unlock:
128         mutex_unlock(&wl->mutex);
129
130         return err;
131 }
132
133 char * b43_rfkill_led_name(struct b43_wldev *dev)
134 {
135         struct b43_rfkill *rfk = &(dev->wl->rfkill);
136
137         if (!rfk->registered)
138                 return NULL;
139         return rfkill_get_led_name(rfk->rfkill);
140 }
141
142 void b43_rfkill_init(struct b43_wldev *dev)
143 {
144         struct b43_wl *wl = dev->wl;
145         struct b43_rfkill *rfk = &(wl->rfkill);
146         int err;
147
148         rfk->registered = 0;
149
150         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
151         if (!rfk->rfkill)
152                 goto out_error;
153         snprintf(rfk->name, sizeof(rfk->name),
154                  "b43-%s", wiphy_name(wl->hw->wiphy));
155         rfk->rfkill->name = rfk->name;
156         rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
157         rfk->rfkill->data = dev;
158         rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
159         rfk->rfkill->user_claim_unsupported = 1;
160
161         rfk->poll_dev = input_allocate_polled_device();
162         if (!rfk->poll_dev) {
163                 rfkill_free(rfk->rfkill);
164                 goto err_freed_rfk;
165         }
166
167         rfk->poll_dev->private = dev;
168         rfk->poll_dev->poll = b43_rfkill_poll;
169         rfk->poll_dev->poll_interval = 1000; /* msecs */
170
171         rfk->poll_dev->input->name = rfk->name;
172         rfk->poll_dev->input->id.bustype = BUS_HOST;
173         rfk->poll_dev->input->id.vendor = dev->dev->bus->boardinfo.vendor;
174         rfk->poll_dev->input->evbit[0] = BIT(EV_KEY);
175         set_bit(KEY_WLAN, rfk->poll_dev->input->keybit);
176
177         err = rfkill_register(rfk->rfkill);
178         if (err)
179                 goto err_free_polldev;
180
181 #ifdef CONFIG_RFKILL_INPUT_MODULE
182         /* B43 RF-kill isn't useful without the rfkill-input subsystem.
183          * Try to load the module. */
184         err = request_module("rfkill-input");
185         if (err)
186                 b43warn(wl, "Failed to load the rfkill-input module. "
187                         "The built-in radio LED will not work.\n");
188 #endif /* CONFIG_RFKILL_INPUT */
189
190         err = input_register_polled_device(rfk->poll_dev);
191         if (err)
192                 goto err_unreg_rfk;
193
194         rfk->registered = 1;
195
196         return;
197 err_unreg_rfk:
198         rfkill_unregister(rfk->rfkill);
199 err_free_polldev:
200         input_free_polled_device(rfk->poll_dev);
201         rfk->poll_dev = NULL;
202 err_freed_rfk:
203         rfk->rfkill = NULL;
204 out_error:
205         rfk->registered = 0;
206         b43warn(wl, "RF-kill button init failed\n");
207 }
208
209 void b43_rfkill_exit(struct b43_wldev *dev)
210 {
211         struct b43_rfkill *rfk = &(dev->wl->rfkill);
212
213         if (!rfk->registered)
214                 return;
215         rfk->registered = 0;
216
217         input_unregister_polled_device(rfk->poll_dev);
218         rfkill_unregister(rfk->rfkill);
219         input_free_polled_device(rfk->poll_dev);
220         rfk->poll_dev = NULL;
221         rfk->rfkill = NULL;
222 }