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 #include <linux/kmod.h>
  29
  30
  31 /* Returns TRUE, if the radio is enabled in hardware. */
  32 static bool b43_is_hw_radio_enabled(struct b43_wldev *dev)
  33 {
  34         if (dev->phy.rev >= 3) {
  35                 if (!(b43_read32(dev, B43_MMIO_RADIO_HWENABLED_HI)
  36                       & B43_MMIO_RADIO_HWENABLED_HI_MASK))
  37                         return 1;
  38         } else {
  39                 if (b43_read16(dev, B43_MMIO_RADIO_HWENABLED_LO)
  40                     & B43_MMIO_RADIO_HWENABLED_LO_MASK)
  41                         return 1;
  42         }
  43         return 0;
  44 }
  45
  46 /* Update the rfkill state */
  47 static void b43_rfkill_update_state(struct b43_wldev *dev)
  48 {
  49         struct b43_rfkill *rfk = &(dev->wl->rfkill);
  50
  51         if (!dev->radio_hw_enable) {
  52                 rfk->rfkill->state = RFKILL_STATE_HARD_BLOCKED;
  53                 return;
  54         }
  55
  56         if (!dev->phy.radio_on)
  57                 rfk->rfkill->state = RFKILL_STATE_SOFT_BLOCKED;
  58         else
  59                 rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
  60
  61 }
  62
  63 /* The poll callback for the hardware button. */
  64 static void b43_rfkill_poll(struct input_polled_dev *poll_dev)
  65 {
  66         struct b43_wldev *dev = poll_dev->private;
  67         struct b43_wl *wl = dev->wl;
  68         bool enabled;
  69         bool report_change = 0;
  70
  71         mutex_lock(&wl->mutex);
  72         if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED)) {
  73                 mutex_unlock(&wl->mutex);
  74                 return;
  75         }
  76         enabled = b43_is_hw_radio_enabled(dev);
  77         if (unlikely(enabled != dev->radio_hw_enable)) {
  78                 dev->radio_hw_enable = enabled;
  79                 report_change = 1;
  80                 b43_rfkill_update_state(dev);
  81                 b43info(wl, "Radio hardware status changed to %s\n",
  82                         enabled ? "ENABLED" : "DISABLED");
  83         }
  84         mutex_unlock(&wl->mutex);
  85
  86         /* send the radio switch event to the system - note both a key press
  87          * and a release are required */
  88         if (unlikely(report_change)) {
  89                 input_report_key(poll_dev->input, KEY_WLAN, 1);
  90                 input_report_key(poll_dev->input, KEY_WLAN, 0);
  91         }
  92 }
  93
  94 /* Called when the RFKILL toggled in software. */
  95 static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state)
  96 {
  97         struct b43_wldev *dev = data;
  98         struct b43_wl *wl = dev->wl;
  99         int err = -EBUSY;
 100
 101         if (!wl->rfkill.registered)
 102                 return 0;
 103
 104         mutex_lock(&wl->mutex);
 105         if (b43_status(dev) < B43_STAT_INITIALIZED)
 106                 goto out_unlock;
 107         err = 0;
 108         switch (state) {
 109         case RFKILL_STATE_UNBLOCKED:
 110                 if (!dev->radio_hw_enable) {
 111                         /* No luck. We can't toggle the hardware RF-kill
 112                          * button from software. */
 113                         err = -EBUSY;
 114                         goto out_unlock;
 115                 }
 116                 if (!dev->phy.radio_on)
 117                         b43_radio_turn_on(dev);
 118                 break;
 119         case RFKILL_STATE_SOFT_BLOCKED:
 120                 if (dev->phy.radio_on)
 121                         b43_radio_turn_off(dev, 0);
 122                 break;
 123         default:
 124                 b43warn(wl, "Received unexpected rfkill state %d.\n", state);
 125                 break;
 126         }
 127 out_unlock:
 128         mutex_unlock(&wl->mutex);
 129
 130         return err;
 131 }
 132
 133 char * b43_rfkill_led_name(struct b43_wldev *dev)
 134 {
 135         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 136
 137         if (!rfk->registered)
 138                 return NULL;
 139         return rfkill_get_led_name(rfk->rfkill);
 140 }
 141
 142 void b43_rfkill_init(struct b43_wldev *dev)
 143 {
 144         struct b43_wl *wl = dev->wl;
 145         struct b43_rfkill *rfk = &(wl->rfkill);
 146         int err;
 147
 148         rfk->registered = 0;
 149
 150         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
 151         if (!rfk->rfkill)
 152                 goto out_error;
 153         snprintf(rfk->name, sizeof(rfk->name),
 154                  "b43-%s", wiphy_name(wl->hw->wiphy));
 155         rfk->rfkill->name = rfk->name;
 156         rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
 157         rfk->rfkill->data = dev;
 158         rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
 159         rfk->rfkill->user_claim_unsupported = 1;
 160
 161         rfk->poll_dev = input_allocate_polled_device();
 162         if (!rfk->poll_dev) {
 163                 rfkill_free(rfk->rfkill);
 164                 goto err_freed_rfk;
 165         }
 166
 167         rfk->poll_dev->private = dev;
 168         rfk->poll_dev->poll = b43_rfkill_poll;
 169         rfk->poll_dev->poll_interval = 1000; /* msecs */
 170
 171         rfk->poll_dev->input->name = rfk->name;
 172         rfk->poll_dev->input->id.bustype = BUS_HOST;
 173         rfk->poll_dev->input->id.vendor = dev->dev->bus->boardinfo.vendor;
 174         rfk->poll_dev->input->evbit[0] = BIT(EV_KEY);
 175         set_bit(KEY_WLAN, rfk->poll_dev->input->keybit);
 176
 177         err = rfkill_register(rfk->rfkill);
 178         if (err)
 179                 goto err_free_polldev;
 180
 181 #ifdef CONFIG_RFKILL_INPUT_MODULE
 182         /* B43 RF-kill isn't useful without the rfkill-input subsystem.
 183          * Try to load the module. */
 184         err = request_module("rfkill-input");
 185         if (err)
 186                 b43warn(wl, "Failed to load the rfkill-input module. "
 187                         "The built-in radio LED will not work.\n");
 188 #endif /* CONFIG_RFKILL_INPUT */
 189
 190         err = input_register_polled_device(rfk->poll_dev);
 191         if (err)
 192                 goto err_unreg_rfk;
 193
 194         rfk->registered = 1;
 195
 196         return;
 197 err_unreg_rfk:
 198         rfkill_unregister(rfk->rfkill);
 199 err_free_polldev:
 200         input_free_polled_device(rfk->poll_dev);
 201         rfk->poll_dev = NULL;
 202 err_freed_rfk:
 203         rfk->rfkill = NULL;
 204 out_error:
 205         rfk->registered = 0;
 206         b43warn(wl, "RF-kill button init failed\n");
 207 }
 208
 209 void b43_rfkill_exit(struct b43_wldev *dev)
 210 {
 211         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 212
 213         if (!rfk->registered)
 214                 return;
 215         rfk->registered = 0;
 216
 217         input_unregister_polled_device(rfk->poll_dev);
 218         rfkill_unregister(rfk->rfkill);
 219         input_free_polled_device(rfk->poll_dev);
 220         rfk->poll_dev = NULL;
 221         rfk->rfkill = NULL;
 222 }