err.no Git - linux-2.6/blob - 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
  29 /* Returns TRUE, if the radio is enabled in hardware. */
  30 static bool b43_is_hw_radio_enabled(struct b43_wldev *dev)
  31 {
  32         if (dev->phy.rev >= 3) {
  33                 if (!(b43_read32(dev, B43_MMIO_RADIO_HWENABLED_HI)
  34                       & B43_MMIO_RADIO_HWENABLED_HI_MASK))
  35                         return 1;
  36         } else {
  37                 if (b43_read16(dev, B43_MMIO_RADIO_HWENABLED_LO)
  38                     & B43_MMIO_RADIO_HWENABLED_LO_MASK)
  39                         return 1;
  40         }
  41         return 0;
  42 }
  43
  44 /* The poll callback for the hardware button. */
  45 static void b43_rfkill_poll(struct input_polled_dev *poll_dev)
  46 {
  47         struct b43_wldev *dev = poll_dev->private;
  48         struct b43_wl *wl = dev->wl;
  49         bool enabled;
  50
  51         mutex_lock(&wl->mutex);
  52         B43_WARN_ON(b43_status(dev) < B43_STAT_INITIALIZED);
  53         enabled = b43_is_hw_radio_enabled(dev);
  54         if (unlikely(enabled != dev->radio_hw_enable)) {
  55                 dev->radio_hw_enable = enabled;
  56                 b43info(wl, "Radio hardware status changed to %s\n",
  57                         enabled ? "ENABLED" : "DISABLED");
  58                 mutex_unlock(&wl->mutex);
  59                 input_report_key(poll_dev->input, KEY_WLAN, enabled);
  60         } else
  61                 mutex_unlock(&wl->mutex);
  62 }
  63
  64 /* Called when the RFKILL toggled in software. */
  65 static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state)
  66 {
  67         struct b43_wldev *dev = data;
  68         struct b43_wl *wl = dev->wl;
  69         int err = 0;
  70
  71         /* When RFKILL is registered, it will call back into this callback.
  72          * wl->mutex will already be locked when this happens.
  73          * So first trylock. On contention check if we are in initialization.
  74          * Silently return if that happens to avoid a deadlock. */
  75         if (mutex_trylock(&wl->mutex) == 0) {
  76                 if (b43_status(dev) < B43_STAT_INITIALIZED)
  77                         return 0;
  78                 mutex_lock(&wl->mutex);
  79         }
  80         if (b43_status(dev) < B43_STAT_INITIALIZED)
  81                 goto out_unlock;
  82
  83         switch (state) {
  84         case RFKILL_STATE_ON:
  85                 if (!dev->radio_hw_enable) {
  86                         /* No luck. We can't toggle the hardware RF-kill
  87                          * button from software. */
  88                         err = -EBUSY;
  89                         goto out_unlock;
  90                 }
  91                 if (!dev->phy.radio_on)
  92                         b43_radio_turn_on(dev);
  93                 break;
  94         case RFKILL_STATE_OFF:
  95                 if (dev->phy.radio_on)
  96                         b43_radio_turn_off(dev, 0);
  97                 break;
  98         }
  99 out_unlock:
 100         mutex_unlock(&wl->mutex);
 101
 102         return err;
 103 }
 104
 105 char * b43_rfkill_led_name(struct b43_wldev *dev)
 106 {
 107         struct b43_wl *wl = dev->wl;
 108
 109         if (!wl->rfkill.rfkill)
 110                 return NULL;
 111         return rfkill_get_led_name(wl->rfkill.rfkill);
 112 }
 113
 114 void b43_rfkill_init(struct b43_wldev *dev)
 115 {
 116         struct b43_wl *wl = dev->wl;
 117         struct b43_rfkill *rfk = &(wl->rfkill);
 118         int err;
 119
 120         if (rfk->rfkill) {
 121                 err = rfkill_register(rfk->rfkill);
 122                 if (err) {
 123                         b43warn(wl, "Failed to register RF-kill button\n");
 124                         goto err_free_rfk;
 125                 }
 126         }
 127         if (rfk->poll_dev) {
 128                 err = input_register_polled_device(rfk->poll_dev);
 129                 if (err) {
 130                         b43warn(wl, "Failed to register RF-kill polldev\n");
 131                         goto err_free_polldev;
 132                 }
 133         }
 134
 135         return;
 136 err_free_rfk:
 137         rfkill_free(rfk->rfkill);
 138         rfk->rfkill = NULL;
 139 err_free_polldev:
 140         input_free_polled_device(rfk->poll_dev);
 141         rfk->poll_dev = NULL;
 142 }
 143
 144 void b43_rfkill_exit(struct b43_wldev *dev)
 145 {
 146         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 147
 148         if (rfk->poll_dev)
 149                 input_unregister_polled_device(rfk->poll_dev);
 150         if (rfk->rfkill)
 151                 rfkill_unregister(rfk->rfkill);
 152 }
 153
 154 void b43_rfkill_alloc(struct b43_wldev *dev)
 155 {
 156         struct b43_wl *wl = dev->wl;
 157         struct b43_rfkill *rfk = &(wl->rfkill);
 158
 159         snprintf(rfk->name, sizeof(rfk->name),
 160                  "b43-%s", wiphy_name(wl->hw->wiphy));
 161
 162         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
 163         if (!rfk->rfkill) {
 164                 b43warn(wl, "Failed to allocate RF-kill button\n");
 165                 return;
 166         }
 167         rfk->rfkill->name = rfk->name;
 168         rfk->rfkill->state = RFKILL_STATE_ON;
 169         rfk->rfkill->data = dev;
 170         rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
 171         rfk->rfkill->user_claim_unsupported = 1;
 172
 173         rfk->poll_dev = input_allocate_polled_device();
 174         if (rfk->poll_dev) {
 175                 rfk->poll_dev->private = dev;
 176                 rfk->poll_dev->poll = b43_rfkill_poll;
 177                 rfk->poll_dev->poll_interval = 1000; /* msecs */
 178         } else
 179                 b43warn(wl, "Failed to allocate RF-kill polldev\n");
 180 }
 181
 182 void b43_rfkill_free(struct b43_wldev *dev)
 183 {
 184         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 185
 186         input_free_polled_device(rfk->poll_dev);
 187         rfk->poll_dev = NULL;
 188         rfkill_free(rfk->rfkill);
 189         rfk->rfkill = NULL;
 190 }