drivers/net/wireless/b43legacy/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 "radio.h"
  27 #include "b43legacy.h"
  28
  29
  30 /* Returns TRUE, if the radio is enabled in hardware. */
  31 static bool b43legacy_is_hw_radio_enabled(struct b43legacy_wldev *dev)
  32 {
  33         if (dev->phy.rev >= 3) {
  34                 if (!(b43legacy_read32(dev, B43legacy_MMIO_RADIO_HWENABLED_HI)
  35                       & B43legacy_MMIO_RADIO_HWENABLED_HI_MASK))
  36                         return 1;
  37         } else {
  38                 if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO)
  39                     & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK)
  40                         return 1;
  41         }
  42         return 0;
  43 }
  44
  45 /* The poll callback for the hardware button. */
  46 static void b43legacy_rfkill_poll(struct input_polled_dev *poll_dev)
  47 {
  48         struct b43legacy_wldev *dev = poll_dev->private;
  49         struct b43legacy_wl *wl = dev->wl;
  50         bool enabled;
  51         bool report_change = 0;
  52
  53         mutex_lock(&wl->mutex);
  54         B43legacy_WARN_ON(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED);
  55         enabled = b43legacy_is_hw_radio_enabled(dev);
  56         if (unlikely(enabled != dev->radio_hw_enable)) {
  57                 dev->radio_hw_enable = enabled;
  58                 report_change = 1;
  59                 b43legacyinfo(wl, "Radio hardware status changed to %s\n",
  60                         enabled ? "ENABLED" : "DISABLED");
  61         }
  62         mutex_unlock(&wl->mutex);
  63
  64         if (unlikely(report_change))
  65                 input_report_key(poll_dev->input, KEY_WLAN, enabled);
  66 }
  67
  68 /* Called when the RFKILL toggled in software.
  69  * This is called without locking. */
  70 static int b43legacy_rfkill_soft_toggle(void *data, enum rfkill_state state)
  71 {
  72         struct b43legacy_wldev *dev = data;
  73         struct b43legacy_wl *wl = dev->wl;
  74         int err = 0;
  75
  76         if (!wl->rfkill.registered)
  77                 return 0;
  78
  79         mutex_lock(&wl->mutex);
  80         B43legacy_WARN_ON(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED);
  81         switch (state) {
  82         case RFKILL_STATE_ON:
  83                 if (!dev->radio_hw_enable) {
  84                         /* No luck. We can't toggle the hardware RF-kill
  85                          * button from software. */
  86                         err = -EBUSY;
  87                         goto out_unlock;
  88                 }
  89                 if (!dev->phy.radio_on)
  90                         b43legacy_radio_turn_on(dev);
  91                 break;
  92         case RFKILL_STATE_OFF:
  93                 if (dev->phy.radio_on)
  94                         b43legacy_radio_turn_off(dev, 0);
  95                 break;
  96         }
  97
  98 out_unlock:
  99         mutex_unlock(&wl->mutex);
 100
 101         return err;
 102 }
 103
 104 char *b43legacy_rfkill_led_name(struct b43legacy_wldev *dev)
 105 {
 106         struct b43legacy_wl *wl = dev->wl;
 107
 108         if (!wl->rfkill.rfkill)
 109                 return NULL;
 110         return rfkill_get_led_name(wl->rfkill.rfkill);
 111 }
 112
 113 void b43legacy_rfkill_init(struct b43legacy_wldev *dev)
 114 {
 115         struct b43legacy_wl *wl = dev->wl;
 116         struct b43legacy_rfkill *rfk = &(wl->rfkill);
 117         int err;
 118
 119         if (rfk->rfkill) {
 120                 err = rfkill_register(rfk->rfkill);
 121                 if (err) {
 122                         b43legacywarn(wl, "Failed to register RF-kill button\n");
 123                         goto err_free_rfk;
 124                 }
 125         }
 126         if (rfk->poll_dev) {
 127                 err = input_register_polled_device(rfk->poll_dev);
 128                 if (err) {
 129                         b43legacywarn(wl, "Failed to register RF-kill polldev\n");
 130                         goto err_free_polldev;
 131                 }
 132         }
 133
 134         return;
 135 err_free_rfk:
 136         rfkill_free(rfk->rfkill);
 137         rfk->rfkill = NULL;
 138 err_free_polldev:
 139         input_free_polled_device(rfk->poll_dev);
 140         rfk->poll_dev = NULL;
 141 }
 142
 143 void b43legacy_rfkill_exit(struct b43legacy_wldev *dev)
 144 {
 145         struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
 146
 147         if (rfk->poll_dev)
 148                 input_unregister_polled_device(rfk->poll_dev);
 149         if (rfk->rfkill)
 150                 rfkill_unregister(rfk->rfkill);
 151 }
 152
 153 void b43legacy_rfkill_alloc(struct b43legacy_wldev *dev)
 154 {
 155         struct b43legacy_wl *wl = dev->wl;
 156         struct b43legacy_rfkill *rfk = &(wl->rfkill);
 157
 158         snprintf(rfk->name, sizeof(rfk->name),
 159                  "b43legacy-%s", wiphy_name(wl->hw->wiphy));
 160
 161         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
 162         if (!rfk->rfkill) {
 163                 b43legacywarn(wl, "Failed to allocate RF-kill button\n");
 164                 return;
 165         }
 166         rfk->rfkill->name = rfk->name;
 167         rfk->rfkill->state = RFKILL_STATE_ON;
 168         rfk->rfkill->data = dev;
 169         rfk->rfkill->toggle_radio = b43legacy_rfkill_soft_toggle;
 170         rfk->rfkill->user_claim_unsupported = 1;
 171
 172         rfk->poll_dev = input_allocate_polled_device();
 173         if (rfk->poll_dev) {
 174                 rfk->poll_dev->private = dev;
 175                 rfk->poll_dev->poll = b43legacy_rfkill_poll;
 176                 rfk->poll_dev->poll_interval = 1000; /* msecs */
 177         } else
 178                 b43legacywarn(wl, "Failed to allocate RF-kill polldev\n");
 179 }
 180
 181 void b43legacy_rfkill_free(struct b43legacy_wldev *dev)
 182 {
 183         struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
 184
 185         input_free_polled_device(rfk->poll_dev);
 186         rfk->poll_dev = NULL;
 187         rfkill_free(rfk->rfkill);
 188         rfk->rfkill = NULL;
 189 }