err.no Git - linux-2.6/blob - drivers/net/wireless/b43legacy/rfkill.c

   1 /*
   2
   3   Broadcom B43legacy 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
  30 static void b43legacy_notify_rfkill_press(struct work_struct *work)
  31 {
  32         struct b43legacy_rfkill *rfk = container_of(work,
  33                                                     struct b43legacy_rfkill,
  34                                                     notify_work);
  35         struct b43legacy_wl *wl = container_of(rfk, struct b43legacy_wl,
  36                                   rfkill);
  37         struct b43legacy_wldev *dev;
  38         enum rfkill_state state;
  39
  40         mutex_lock(&wl->mutex);
  41         dev = wl->current_dev;
  42         if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) {
  43                 mutex_unlock(&wl->mutex);
  44                 return;
  45         }
  46         if (dev->radio_hw_enable)
  47                 state = RFKILL_STATE_ON;
  48         else
  49                 state = RFKILL_STATE_OFF;
  50         b43legacyinfo(wl, "Radio hardware status changed to %s\n",
  51                 dev->radio_hw_enable ? "ENABLED" : "DISABLED");
  52         mutex_unlock(&wl->mutex);
  53
  54         if (rfk->rfkill) {
  55                 /* Be careful. This calls back into the software toggle
  56                  * routines. So we must unlock before calling. */
  57                 rfkill_switch_all(rfk->rfkill->type, state);
  58         }
  59 }
  60
  61 /* Called when the RFKILL toggled in hardware.
  62  * This is called with the mutex locked. */
  63 void b43legacy_rfkill_toggled(struct b43legacy_wldev *dev, bool on)
  64 {
  65         struct b43legacy_wl *wl = dev->wl;
  66
  67         B43legacy_WARN_ON(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED);
  68         /* Update the RF status asynchronously, as rfkill will
  69          * call back into the software toggle handler.
  70          * This would deadlock if done synchronously. */
  71         queue_work(wl->hw->workqueue, &wl->rfkill.notify_work);
  72 }
  73
  74 /* Called when the RFKILL toggled in software.
  75  * This is called without locking. */
  76 static int b43legacy_rfkill_soft_toggle(void *data, enum rfkill_state state)
  77 {
  78         struct b43legacy_wldev *dev = data;
  79         struct b43legacy_wl *wl = dev->wl;
  80         int err = 0;
  81
  82         mutex_lock(&wl->mutex);
  83         if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)
  84                 goto out_unlock;
  85
  86         switch (state) {
  87         case RFKILL_STATE_ON:
  88                 if (!dev->radio_hw_enable) {
  89                         /* No luck. We can't toggle the hardware RF-kill
  90                          * button from software. */
  91                         err = -EBUSY;
  92                         goto out_unlock;
  93                 }
  94                 if (!dev->phy.radio_on)
  95                         b43legacy_radio_turn_on(dev);
  96                 break;
  97         case RFKILL_STATE_OFF:
  98                 if (dev->phy.radio_on)
  99                         b43legacy_radio_turn_off(dev, 0);
 100                 break;
 101         }
 102
 103 out_unlock:
 104         mutex_unlock(&wl->mutex);
 105
 106         return err;
 107 }
 108
 109 char *b43legacy_rfkill_led_name(struct b43legacy_wldev *dev)
 110 {
 111         struct b43legacy_wl *wl = dev->wl;
 112
 113         if (!wl->rfkill.rfkill)
 114                 return NULL;
 115         return rfkill_get_led_name(wl->rfkill.rfkill);
 116 }
 117
 118 void b43legacy_rfkill_init(struct b43legacy_wldev *dev)
 119 {
 120         struct b43legacy_wl *wl = dev->wl;
 121         struct b43legacy_rfkill *rfk = &(wl->rfkill);
 122         int err;
 123
 124         snprintf(rfk->name, sizeof(rfk->name),
 125                  "b43legacy-%s", wiphy_name(wl->hw->wiphy));
 126         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
 127         if (!rfk->rfkill)
 128                 goto error;
 129         rfk->rfkill->name = rfk->name;
 130         rfk->rfkill->state = RFKILL_STATE_ON;
 131         rfk->rfkill->data = dev;
 132         rfk->rfkill->toggle_radio = b43legacy_rfkill_soft_toggle;
 133         rfk->rfkill->user_claim_unsupported = 1;
 134
 135         INIT_WORK(&rfk->notify_work, b43legacy_notify_rfkill_press);
 136
 137         err = rfkill_register(rfk->rfkill);
 138         if (err)
 139                 goto error;
 140
 141         return;
 142 error:
 143         b43legacywarn(dev->wl, "Failed to initialize the RF-kill button\n");
 144         rfkill_free(rfk->rfkill);
 145         rfk->rfkill = NULL;
 146 }
 147
 148 void b43legacy_rfkill_exit(struct b43legacy_wldev *dev)
 149 {
 150         struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
 151
 152         if (!rfk->rfkill)
 153                 return;
 154         cancel_work_sync(&rfk->notify_work);
 155         rfkill_unregister(rfk->rfkill);
 156         rfkill_free(rfk->rfkill);
 157         rfk->rfkill = NULL;
 158 }