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 #include <linux/kmod.h>
  30
  31
  32 /* Returns TRUE, if the radio is enabled in hardware. */
  33 static bool b43legacy_is_hw_radio_enabled(struct b43legacy_wldev *dev)
  34 {
  35         if (dev->phy.rev >= 3) {
  36                 if (!(b43legacy_read32(dev, B43legacy_MMIO_RADIO_HWENABLED_HI)
  37                       & B43legacy_MMIO_RADIO_HWENABLED_HI_MASK))
  38                         return 1;
  39         } else {
  40                 if (b43legacy_read16(dev, B43legacy_MMIO_RADIO_HWENABLED_LO)
  41                     & B43legacy_MMIO_RADIO_HWENABLED_LO_MASK)
  42                         return 1;
  43         }
  44         return 0;
  45 }
  46
  47 /* Update the rfkill state */
  48 static void b43legacy_rfkill_update_state(struct b43legacy_wldev *dev)
  49 {
  50         struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
  51
  52         if (!dev->radio_hw_enable) {
  53                 rfk->rfkill->state = RFKILL_STATE_HARD_BLOCKED;
  54                 return;
  55         }
  56
  57         if (!dev->phy.radio_on)
  58                 rfk->rfkill->state = RFKILL_STATE_SOFT_BLOCKED;
  59         else
  60                 rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
  61
  62 }
  63
  64 /* The poll callback for the hardware button. */
  65 static void b43legacy_rfkill_poll(struct input_polled_dev *poll_dev)
  66 {
  67         struct b43legacy_wldev *dev = poll_dev->private;
  68         struct b43legacy_wl *wl = dev->wl;
  69         bool enabled;
  70         bool report_change = 0;
  71
  72         mutex_lock(&wl->mutex);
  73         if (unlikely(b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)) {
  74                 mutex_unlock(&wl->mutex);
  75                 return;
  76         }
  77         enabled = b43legacy_is_hw_radio_enabled(dev);
  78         if (unlikely(enabled != dev->radio_hw_enable)) {
  79                 dev->radio_hw_enable = enabled;
  80                 report_change = 1;
  81                 b43legacy_rfkill_update_state(dev);
  82                 b43legacyinfo(wl, "Radio hardware status changed to %s\n",
  83                         enabled ? "ENABLED" : "DISABLED");
  84         }
  85         mutex_unlock(&wl->mutex);
  86
  87         /* send the radio switch event to the system - note both a key press
  88          * and a release are required */
  89         if (unlikely(report_change)) {
  90                 input_report_key(poll_dev->input, KEY_WLAN, 1);
  91                 input_report_key(poll_dev->input, KEY_WLAN, 0);
  92         }
  93 }
  94
  95 /* Called when the RFKILL toggled in software.
  96  * This is called without locking. */
  97 static int b43legacy_rfkill_soft_toggle(void *data, enum rfkill_state state)
  98 {
  99         struct b43legacy_wldev *dev = data;
 100         struct b43legacy_wl *wl = dev->wl;
 101         int err = -EBUSY;
 102
 103         if (!wl->rfkill.registered)
 104                 return 0;
 105
 106         mutex_lock(&wl->mutex);
 107         if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED)
 108                 goto out_unlock;
 109         err = 0;
 110         switch (state) {
 111         case RFKILL_STATE_UNBLOCKED:
 112                 if (!dev->radio_hw_enable) {
 113                         /* No luck. We can't toggle the hardware RF-kill
 114                          * button from software. */
 115                         err = -EBUSY;
 116                         goto out_unlock;
 117                 }
 118                 if (!dev->phy.radio_on)
 119                         b43legacy_radio_turn_on(dev);
 120                 break;
 121         case RFKILL_STATE_SOFT_BLOCKED:
 122                 if (dev->phy.radio_on)
 123                         b43legacy_radio_turn_off(dev, 0);
 124                 break;
 125         default:
 126                 b43legacywarn(wl, "Received unexpected rfkill state %d.\n",
 127                               state);
 128                 break;
 129         }
 130
 131 out_unlock:
 132         mutex_unlock(&wl->mutex);
 133
 134         return err;
 135 }
 136
 137 char *b43legacy_rfkill_led_name(struct b43legacy_wldev *dev)
 138 {
 139         struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
 140
 141         if (!rfk->registered)
 142                 return NULL;
 143         return rfkill_get_led_name(rfk->rfkill);
 144 }
 145
 146 void b43legacy_rfkill_init(struct b43legacy_wldev *dev)
 147 {
 148         struct b43legacy_wl *wl = dev->wl;
 149         struct b43legacy_rfkill *rfk = &(wl->rfkill);
 150         int err;
 151
 152         rfk->registered = 0;
 153
 154         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
 155         if (!rfk->rfkill)
 156                 goto out_error;
 157         snprintf(rfk->name, sizeof(rfk->name),
 158                  "b43legacy-%s", wiphy_name(wl->hw->wiphy));
 159         rfk->rfkill->name = rfk->name;
 160         rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
 161         rfk->rfkill->data = dev;
 162         rfk->rfkill->toggle_radio = b43legacy_rfkill_soft_toggle;
 163         rfk->rfkill->user_claim_unsupported = 1;
 164
 165         rfk->poll_dev = input_allocate_polled_device();
 166         if (!rfk->poll_dev) {
 167                 rfkill_free(rfk->rfkill);
 168                 goto err_freed_rfk;
 169         }
 170
 171         rfk->poll_dev->private = dev;
 172         rfk->poll_dev->poll = b43legacy_rfkill_poll;
 173         rfk->poll_dev->poll_interval = 1000; /* msecs */
 174
 175         rfk->poll_dev->input->name = rfk->name;
 176         rfk->poll_dev->input->id.bustype = BUS_HOST;
 177         rfk->poll_dev->input->id.vendor = dev->dev->bus->boardinfo.vendor;
 178         rfk->poll_dev->input->evbit[0] = BIT(EV_KEY);
 179         set_bit(KEY_WLAN, rfk->poll_dev->input->keybit);
 180
 181         err = rfkill_register(rfk->rfkill);
 182         if (err)
 183                 goto err_free_polldev;
 184
 185 #ifdef CONFIG_RFKILL_INPUT_MODULE
 186         /* B43legacy RF-kill isn't useful without the rfkill-input subsystem.
 187          * Try to load the module. */
 188         err = request_module("rfkill-input");
 189         if (err)
 190                 b43legacywarn(wl, "Failed to load the rfkill-input module."
 191                         "The built-in radio LED will not work.\n");
 192 #endif /* CONFIG_RFKILL_INPUT */
 193
 194         err = input_register_polled_device(rfk->poll_dev);
 195         if (err)
 196                 goto err_unreg_rfk;
 197
 198         rfk->registered = 1;
 199
 200         return;
 201 err_unreg_rfk:
 202         rfkill_unregister(rfk->rfkill);
 203 err_free_polldev:
 204         input_free_polled_device(rfk->poll_dev);
 205         rfk->poll_dev = NULL;
 206 err_freed_rfk:
 207         rfk->rfkill = NULL;
 208 out_error:
 209         rfk->registered = 0;
 210         b43legacywarn(wl, "RF-kill button init failed\n");
 211 }
 212
 213 void b43legacy_rfkill_exit(struct b43legacy_wldev *dev)
 214 {
 215         struct b43legacy_rfkill *rfk = &(dev->wl->rfkill);
 216
 217         if (!rfk->registered)
 218                 return;
 219         rfk->registered = 0;
 220
 221         input_unregister_polled_device(rfk->poll_dev);
 222         rfkill_unregister(rfk->rfkill);
 223         input_free_polled_device(rfk->poll_dev);
 224         rfk->poll_dev = NULL;
 225         rfk->rfkill = NULL;
 226 }
 227