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 /* Update the rfkill state */
  48 static void b43_rfkill_update_state(struct b43_wldev *dev)
  49 {
  50         struct b43_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 b43_rfkill_poll(struct input_polled_dev *poll_dev)
  66 {
  67         struct b43_wldev *dev = poll_dev->private;
  68         struct b43_wl *wl = dev->wl;
  69         bool enabled;
  70         bool report_change = 0;
  71
  72         mutex_lock(&wl->mutex);
  73         if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED)) {
  74                 mutex_unlock(&wl->mutex);
  75                 return;
  76         }
  77         enabled = b43_is_hw_radio_enabled(dev);
  78         if (unlikely(enabled != dev->radio_hw_enable)) {
  79                 dev->radio_hw_enable = enabled;
  80                 report_change = 1;
  81                 b43_rfkill_update_state(dev);
  82                 b43info(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 static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state)
  97 {
  98         struct b43_wldev *dev = data;
  99         struct b43_wl *wl = dev->wl;
 100         int err = -EBUSY;
 101
 102         if (!wl->rfkill.registered)
 103                 return 0;
 104
 105         mutex_lock(&wl->mutex);
 106         if (b43_status(dev) < B43_STAT_INITIALIZED)
 107                 goto out_unlock;
 108         err = 0;
 109         switch (state) {
 110         case RFKILL_STATE_UNBLOCKED:
 111                 if (!dev->radio_hw_enable) {
 112                         /* No luck. We can't toggle the hardware RF-kill
 113                          * button from software. */
 114                         err = -EBUSY;
 115                         goto out_unlock;
 116                 }
 117                 if (!dev->phy.radio_on)
 118                         b43_software_rfkill(dev, state);
 119                 break;
 120         case RFKILL_STATE_SOFT_BLOCKED:
 121                 if (dev->phy.radio_on)
 122                         b43_software_rfkill(dev, state);
 123                 break;
 124         default:
 125                 b43warn(wl, "Received unexpected rfkill state %d.\n", state);
 126                 break;
 127         }
 128 out_unlock:
 129         mutex_unlock(&wl->mutex);
 130
 131         return err;
 132 }
 133
 134 char * b43_rfkill_led_name(struct b43_wldev *dev)
 135 {
 136         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 137
 138         if (!rfk->registered)
 139                 return NULL;
 140         return rfkill_get_led_name(rfk->rfkill);
 141 }
 142
 143 void b43_rfkill_init(struct b43_wldev *dev)
 144 {
 145         struct b43_wl *wl = dev->wl;
 146         struct b43_rfkill *rfk = &(wl->rfkill);
 147         int err;
 148
 149         rfk->registered = 0;
 150
 151         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
 152         if (!rfk->rfkill)
 153                 goto out_error;
 154         snprintf(rfk->name, sizeof(rfk->name),
 155                  "b43-%s", wiphy_name(wl->hw->wiphy));
 156         rfk->rfkill->name = rfk->name;
 157         rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
 158         rfk->rfkill->data = dev;
 159         rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
 160         rfk->rfkill->user_claim_unsupported = 1;
 161
 162         rfk->poll_dev = input_allocate_polled_device();
 163         if (!rfk->poll_dev) {
 164                 rfkill_free(rfk->rfkill);
 165                 goto err_freed_rfk;
 166         }
 167
 168         rfk->poll_dev->private = dev;
 169         rfk->poll_dev->poll = b43_rfkill_poll;
 170         rfk->poll_dev->poll_interval = 1000; /* msecs */
 171
 172         rfk->poll_dev->input->name = rfk->name;
 173         rfk->poll_dev->input->id.bustype = BUS_HOST;
 174         rfk->poll_dev->input->id.vendor = dev->dev->bus->boardinfo.vendor;
 175         rfk->poll_dev->input->evbit[0] = BIT(EV_KEY);
 176         set_bit(KEY_WLAN, rfk->poll_dev->input->keybit);
 177
 178         err = rfkill_register(rfk->rfkill);
 179         if (err)
 180                 goto err_free_polldev;
 181
 182 #ifdef CONFIG_RFKILL_INPUT_MODULE
 183         /* B43 RF-kill isn't useful without the rfkill-input subsystem.
 184          * Try to load the module. */
 185         err = request_module("rfkill-input");
 186         if (err)
 187                 b43warn(wl, "Failed to load the rfkill-input module. "
 188                         "The built-in radio LED will not work.\n");
 189 #endif /* CONFIG_RFKILL_INPUT */
 190
 191 #if !defined(CONFIG_RFKILL_INPUT) && !defined(CONFIG_RFKILL_INPUT_MODULE)
 192         b43warn(wl, "The rfkill-input subsystem is not available. "
 193                 "The built-in radio LED will not work.\n");
 194 #endif
 195
 196         err = input_register_polled_device(rfk->poll_dev);
 197         if (err)
 198                 goto err_unreg_rfk;
 199
 200         rfk->registered = 1;
 201
 202         return;
 203 err_unreg_rfk:
 204         rfkill_unregister(rfk->rfkill);
 205 err_free_polldev:
 206         input_free_polled_device(rfk->poll_dev);
 207         rfk->poll_dev = NULL;
 208 err_freed_rfk:
 209         rfk->rfkill = NULL;
 210 out_error:
 211         rfk->registered = 0;
 212         b43warn(wl, "RF-kill button init failed\n");
 213 }
 214
 215 void b43_rfkill_exit(struct b43_wldev *dev)
 216 {
 217         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 218
 219         if (!rfk->registered)
 220                 return;
 221         rfk->registered = 0;
 222
 223         input_unregister_polled_device(rfk->poll_dev);
 224         rfkill_unregister(rfk->rfkill);
 225         input_free_polled_device(rfk->poll_dev);
 226         rfk->poll_dev = NULL;
 227         rfk->rfkill = NULL;
 228 }