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_ON:
  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_OFF:
 102                 if (dev->phy.radio_on)
 103                         b43_radio_turn_off(dev, 0);
 104                 break;
 105         }
 106 out_unlock:
 107         mutex_unlock(&wl->mutex);
 108
 109         return err;
 110 }
 111
 112 char * b43_rfkill_led_name(struct b43_wldev *dev)
 113 {
 114         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 115
 116         if (!rfk->registered)
 117                 return NULL;
 118         return rfkill_get_led_name(rfk->rfkill);
 119 }
 120
 121 void b43_rfkill_init(struct b43_wldev *dev)
 122 {
 123         struct b43_wl *wl = dev->wl;
 124         struct b43_rfkill *rfk = &(wl->rfkill);
 125         int err;
 126
 127         rfk->registered = 0;
 128
 129         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
 130         if (!rfk->rfkill)
 131                 goto out_error;
 132         snprintf(rfk->name, sizeof(rfk->name),
 133                  "b43-%s", wiphy_name(wl->hw->wiphy));
 134         rfk->rfkill->name = rfk->name;
 135         rfk->rfkill->state = RFKILL_STATE_ON;
 136         rfk->rfkill->data = dev;
 137         rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
 138         rfk->rfkill->user_claim_unsupported = 1;
 139
 140         rfk->poll_dev = input_allocate_polled_device();
 141         if (!rfk->poll_dev)
 142                 goto err_free_rfk;
 143         rfk->poll_dev->private = dev;
 144         rfk->poll_dev->poll = b43_rfkill_poll;
 145         rfk->poll_dev->poll_interval = 1000; /* msecs */
 146
 147         rfk->poll_dev->input->name = rfk->name;
 148         rfk->poll_dev->input->id.bustype = BUS_HOST;
 149         rfk->poll_dev->input->id.vendor = dev->dev->bus->boardinfo.vendor;
 150         rfk->poll_dev->input->evbit[0] = BIT(EV_KEY);
 151         set_bit(KEY_WLAN, rfk->poll_dev->input->keybit);
 152
 153         err = rfkill_register(rfk->rfkill);
 154         if (err)
 155                 goto err_free_polldev;
 156
 157 #ifdef CONFIG_RFKILL_INPUT_MODULE
 158         /* B43 RF-kill isn't useful without the rfkill-input subsystem.
 159          * Try to load the module. */
 160         err = request_module("rfkill-input");
 161         if (err)
 162                 b43warn(wl, "Failed to load the rfkill-input module. "
 163                         "The built-in radio LED will not work.\n");
 164 #endif /* CONFIG_RFKILL_INPUT */
 165
 166         err = input_register_polled_device(rfk->poll_dev);
 167         if (err)
 168                 goto err_unreg_rfk;
 169
 170         rfk->registered = 1;
 171
 172         return;
 173 err_unreg_rfk:
 174         rfkill_unregister(rfk->rfkill);
 175 err_free_polldev:
 176         input_free_polled_device(rfk->poll_dev);
 177         rfk->poll_dev = NULL;
 178 err_free_rfk:
 179         rfkill_free(rfk->rfkill);
 180         rfk->rfkill = NULL;
 181 out_error:
 182         rfk->registered = 0;
 183         b43warn(wl, "RF-kill button init failed\n");
 184 }
 185
 186 void b43_rfkill_exit(struct b43_wldev *dev)
 187 {
 188         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 189
 190         if (!rfk->registered)
 191                 return;
 192         rfk->registered = 0;
 193
 194         input_unregister_polled_device(rfk->poll_dev);
 195         rfkill_unregister(rfk->rfkill);
 196         input_free_polled_device(rfk->poll_dev);
 197         rfk->poll_dev = NULL;
 198         rfkill_free(rfk->rfkill);
 199         rfk->rfkill = NULL;
 200 }