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 static void b43_notify_rfkill_press(struct work_struct *work)
  30 {
  31         struct b43_rfkill *rfk = container_of(work, struct b43_rfkill,
  32                                               notify_work);
  33         struct b43_wl *wl = container_of(rfk, struct b43_wl, rfkill);
  34         struct b43_wldev *dev;
  35         enum rfkill_state state;
  36
  37         mutex_lock(&wl->mutex);
  38         dev = wl->current_dev;
  39         if (b43_status(dev) < B43_STAT_INITIALIZED) {
  40                 mutex_unlock(&wl->mutex);
  41                 return;
  42         }
  43         if (dev->radio_hw_enable)
  44                 state = RFKILL_STATE_ON;
  45         else
  46                 state = RFKILL_STATE_OFF;
  47         b43info(wl, "Radio hardware status changed to %s\n",
  48                 dev->radio_hw_enable ? "ENABLED" : "DISABLED");
  49         mutex_unlock(&wl->mutex);
  50
  51         if (rfk->rfkill) {
  52                 /* Be careful. This calls back into the software toggle routines.
  53                  * So we must unlock before calling. */
  54                 rfkill_switch_all(rfk->rfkill->type, state);
  55         }
  56 }
  57
  58 /* Called when the RFKILL toggled in hardware.
  59  * This is called with the mutex locked. */
  60 void b43_rfkill_toggled(struct b43_wldev *dev, bool on)
  61 {
  62         struct b43_wl *wl = dev->wl;
  63
  64         B43_WARN_ON(b43_status(dev) < B43_STAT_INITIALIZED);
  65         /* Update the RF status asynchronously, as rfkill will
  66          * call back into the software toggle handler.
  67          * This would deadlock if done synchronously. */
  68         queue_work(wl->hw->workqueue, &wl->rfkill.notify_work);
  69 }
  70
  71 /* Called when the RFKILL toggled in software.
  72  * This is called without locking. */
  73 static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state)
  74 {
  75         struct b43_wldev *dev = data;
  76         struct b43_wl *wl = dev->wl;
  77         int err = 0;
  78
  79         mutex_lock(&wl->mutex);
  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
 100 out_unlock:
 101         mutex_unlock(&wl->mutex);
 102
 103         return err;
 104 }
 105
 106 char * b43_rfkill_led_name(struct b43_wldev *dev)
 107 {
 108         struct b43_wl *wl = dev->wl;
 109
 110         if (!wl->rfkill.rfkill)
 111                 return NULL;
 112         return rfkill_get_led_name(wl->rfkill.rfkill);
 113 }
 114
 115 void b43_rfkill_init(struct b43_wldev *dev)
 116 {
 117         struct b43_wl *wl = dev->wl;
 118         struct b43_rfkill *rfk = &(wl->rfkill);
 119         int err;
 120
 121         snprintf(rfk->name, sizeof(rfk->name),
 122                  "b43-%s", wiphy_name(wl->hw->wiphy));
 123         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
 124         if (!rfk->rfkill)
 125                 goto error;
 126         rfk->rfkill->name = rfk->name;
 127         rfk->rfkill->state = RFKILL_STATE_ON;
 128         rfk->rfkill->data = dev;
 129         rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
 130         rfk->rfkill->user_claim_unsupported = 1;
 131
 132         INIT_WORK(&rfk->notify_work, b43_notify_rfkill_press);
 133
 134         err = rfkill_register(rfk->rfkill);
 135         if (err)
 136                 goto error;
 137
 138         return;
 139 error:
 140         b43warn(dev->wl, "Failed to initialize the RF-kill button\n");
 141         rfkill_free(rfk->rfkill);
 142         rfk->rfkill = NULL;
 143 }
 144
 145 void b43_rfkill_exit(struct b43_wldev *dev)
 146 {
 147         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 148
 149         if (!rfk->rfkill)
 150                 return;
 151         cancel_work_sync(&rfk->notify_work);
 152         rfkill_unregister(rfk->rfkill);
 153         rfkill_free(rfk->rfkill);
 154         rfk->rfkill = NULL;
 155 }