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 #include "phy_common.h"
  28
  29 #include <linux/kmod.h>
  30
  31
  32 /* Returns TRUE, if the radio is enabled in hardware. */
  33 static bool b43_is_hw_radio_enabled(struct b43_wldev *dev)
  34 {
  35         if (dev->phy.rev >= 3) {
  36                 if (!(b43_read32(dev, B43_MMIO_RADIO_HWENABLED_HI)
  37                       & B43_MMIO_RADIO_HWENABLED_HI_MASK))
  38                         return 1;
  39         } else {
  40                 if (b43_read16(dev, B43_MMIO_RADIO_HWENABLED_LO)
  41                     & B43_MMIO_RADIO_HWENABLED_LO_MASK)
  42                         return 1;
  43         }
  44         return 0;
  45 }
  46
  47 /* The poll callback for the hardware button. */
  48 static void b43_rfkill_poll(struct rfkill *rfkill, void *data)
  49 {
  50         struct b43_wldev *dev = data;
  51         struct b43_wl *wl = dev->wl;
  52         bool enabled;
  53
  54         mutex_lock(&wl->mutex);
  55         if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED)) {
  56                 mutex_unlock(&wl->mutex);
  57                 return;
  58         }
  59         enabled = b43_is_hw_radio_enabled(dev);
  60         if (unlikely(enabled != dev->radio_hw_enable)) {
  61                 dev->radio_hw_enable = enabled;
  62                 b43info(wl, "Radio hardware status changed to %s\n",
  63                         enabled ? "ENABLED" : "DISABLED");
  64                 enabled = !rfkill_set_hw_state(rfkill, !enabled);
  65                 if (enabled != dev->phy.radio_on)
  66                         b43_software_rfkill(dev, !enabled);
  67         }
  68         mutex_unlock(&wl->mutex);
  69 }
  70
  71 /* Called when the RFKILL toggled in software. */
  72 static int b43_rfkill_soft_set(void *data, bool blocked)
  73 {
  74         struct b43_wldev *dev = data;
  75         struct b43_wl *wl = dev->wl;
  76         int err = -EINVAL;
  77
  78         if (WARN_ON(!wl->rfkill.registered))
  79                 return -EINVAL;
  80
  81         mutex_lock(&wl->mutex);
  82
  83         if (b43_status(dev) < B43_STAT_INITIALIZED)
  84                 goto out_unlock;
  85
  86         if (!dev->radio_hw_enable)
  87                 goto out_unlock;
  88
  89         if (!blocked != dev->phy.radio_on)
  90                 b43_software_rfkill(dev, blocked);
  91         err = 0;
  92 out_unlock:
  93         mutex_unlock(&wl->mutex);
  94         return err;
  95 }
  96
  97 const char *b43_rfkill_led_name(struct b43_wldev *dev)
  98 {
  99         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 100
 101         if (!rfk->registered)
 102                 return NULL;
 103         return rfkill_get_led_trigger_name(rfk->rfkill);
 104 }
 105
 106 static const struct rfkill_ops b43_rfkill_ops = {
 107         .set_block = b43_rfkill_soft_set,
 108         .poll = b43_rfkill_poll,
 109 };
 110
 111 void b43_rfkill_init(struct b43_wldev *dev)
 112 {
 113         struct b43_wl *wl = dev->wl;
 114         struct b43_rfkill *rfk = &(wl->rfkill);
 115         int err;
 116
 117         rfk->registered = 0;
 118
 119         snprintf(rfk->name, sizeof(rfk->name),
 120                  "b43-%s", wiphy_name(wl->hw->wiphy));
 121
 122         rfk->rfkill = rfkill_alloc(rfk->name,
 123                                    dev->dev->dev,
 124                                    RFKILL_TYPE_WLAN,
 125                                    &b43_rfkill_ops, dev);
 126         if (!rfk->rfkill)
 127                 goto out_error;
 128
 129         err = rfkill_register(rfk->rfkill);
 130         if (err)
 131                 goto err_free;
 132
 133         rfk->registered = 1;
 134
 135         return;
 136  err_free:
 137         rfkill_destroy(rfk->rfkill);
 138  out_error:
 139         rfk->registered = 0;
 140         b43warn(wl, "RF-kill button init failed\n");
 141 }
 142
 143 void b43_rfkill_exit(struct b43_wldev *dev)
 144 {
 145         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 146
 147         if (!rfk->registered)
 148                 return;
 149         rfk->registered = 0;
 150
 151         rfkill_unregister(rfk->rfkill);
 152         rfkill_destroy(rfk->rfkill);
 153         rfk->rfkill = NULL;
 154 }