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