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 input_polled_dev *poll_dev)
  49 {
  50         struct b43_wldev *dev = poll_dev->private;
  51         struct b43_wl *wl = dev->wl;
  52         bool enabled;
  53         bool report_change = 0;
  54
  55         mutex_lock(&wl->mutex);
  56         if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED)) {
  57                 mutex_unlock(&wl->mutex);
  58                 return;
  59         }
  60         enabled = b43_is_hw_radio_enabled(dev);
  61         if (unlikely(enabled != dev->radio_hw_enable)) {
  62                 dev->radio_hw_enable = enabled;
  63                 report_change = 1;
  64                 b43info(wl, "Radio hardware status changed to %s\n",
  65                         enabled ? "ENABLED" : "DISABLED");
  66         }
  67         mutex_unlock(&wl->mutex);
  68
  69         /* send the radio switch event to the system - note both a key press
  70          * and a release are required */
  71         if (unlikely(report_change)) {
  72                 input_report_key(poll_dev->input, KEY_WLAN, 1);
  73                 input_report_key(poll_dev->input, KEY_WLAN, 0);
  74         }
  75 }
  76
  77 /* Called when the RFKILL toggled in software. */
  78 static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state)
  79 {
  80         struct b43_wldev *dev = data;
  81         struct b43_wl *wl = dev->wl;
  82         int err = -EBUSY;
  83
  84         if (!wl->rfkill.registered)
  85                 return 0;
  86
  87         mutex_lock(&wl->mutex);
  88         if (b43_status(dev) < B43_STAT_INITIALIZED)
  89                 goto out_unlock;
  90         err = 0;
  91         switch (state) {
  92         case RFKILL_STATE_UNBLOCKED:
  93                 if (!dev->radio_hw_enable) {
  94                         /* No luck. We can't toggle the hardware RF-kill
  95                          * button from software. */
  96                         err = -EBUSY;
  97                         goto out_unlock;
  98                 }
  99                 if (!dev->phy.radio_on)
 100                         b43_software_rfkill(dev, state);
 101                 break;
 102         case RFKILL_STATE_SOFT_BLOCKED:
 103                 if (dev->phy.radio_on)
 104                         b43_software_rfkill(dev, state);
 105                 break;
 106         default:
 107                 b43warn(wl, "Received unexpected rfkill state %d.\n", state);
 108                 break;
 109         }
 110 out_unlock:
 111         mutex_unlock(&wl->mutex);
 112
 113         return err;
 114 }
 115
 116 char *b43_rfkill_led_name(struct b43_wldev *dev)
 117 {
 118         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 119
 120         if (!rfk->registered)
 121                 return NULL;
 122         return rfkill_get_led_name(rfk->rfkill);
 123 }
 124
 125 void b43_rfkill_init(struct b43_wldev *dev)
 126 {
 127         struct b43_wl *wl = dev->wl;
 128         struct b43_rfkill *rfk = &(wl->rfkill);
 129         int err;
 130
 131         rfk->registered = 0;
 132
 133         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
 134         if (!rfk->rfkill)
 135                 goto out_error;
 136         snprintf(rfk->name, sizeof(rfk->name),
 137                  "b43-%s", wiphy_name(wl->hw->wiphy));
 138         rfk->rfkill->name = rfk->name;
 139         rfk->rfkill->state = RFKILL_STATE_UNBLOCKED;
 140         rfk->rfkill->data = dev;
 141         rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
 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 #if !defined(CONFIG_RFKILL_INPUT) && !defined(CONFIG_RFKILL_INPUT_MODULE)
 173         b43warn(wl, "The rfkill-input subsystem is not available. "
 174                 "The built-in radio LED will not work.\n");
 175 #endif
 176
 177         err = input_register_polled_device(rfk->poll_dev);
 178         if (err)
 179                 goto err_unreg_rfk;
 180
 181         rfk->registered = 1;
 182
 183         return;
 184 err_unreg_rfk:
 185         rfkill_unregister(rfk->rfkill);
 186 err_free_polldev:
 187         input_free_polled_device(rfk->poll_dev);
 188         rfk->poll_dev = NULL;
 189 err_freed_rfk:
 190         rfk->rfkill = NULL;
 191 out_error:
 192         rfk->registered = 0;
 193         b43warn(wl, "RF-kill button init failed\n");
 194 }
 195
 196 void b43_rfkill_exit(struct b43_wldev *dev)
 197 {
 198         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 199
 200         if (!rfk->registered)
 201                 return;
 202         rfk->registered = 0;
 203
 204         input_unregister_polled_device(rfk->poll_dev);
 205         rfkill_unregister(rfk->rfkill);
 206         input_free_polled_device(rfk->poll_dev);
 207         rfk->poll_dev = NULL;
 208         rfk->rfkill = NULL;
 209 }