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
  29 /* Returns TRUE, if the radio is enabled in hardware. */
  30 static bool b43_is_hw_radio_enabled(struct b43_wldev *dev)
  31 {
  32         if (dev->phy.rev >= 3) {
  33                 if (!(b43_read32(dev, B43_MMIO_RADIO_HWENABLED_HI)
  34                       & B43_MMIO_RADIO_HWENABLED_HI_MASK))
  35                         return 1;
  36         } else {
  37                 if (b43_read16(dev, B43_MMIO_RADIO_HWENABLED_LO)
  38                     & B43_MMIO_RADIO_HWENABLED_LO_MASK)
  39                         return 1;
  40         }
  41         return 0;
  42 }
  43
  44 /* The poll callback for the hardware button. */
  45 static void b43_rfkill_poll(struct input_polled_dev *poll_dev)
  46 {
  47         struct b43_wldev *dev = poll_dev->private;
  48         struct b43_wl *wl = dev->wl;
  49         bool enabled;
  50         bool report_change = 0;
  51
  52         mutex_lock(&wl->mutex);
  53         B43_WARN_ON(b43_status(dev) < B43_STAT_INITIALIZED);
  54         enabled = b43_is_hw_radio_enabled(dev);
  55         if (unlikely(enabled != dev->radio_hw_enable)) {
  56                 dev->radio_hw_enable = enabled;
  57                 report_change = 1;
  58                 b43info(wl, "Radio hardware status changed to %s\n",
  59                         enabled ? "ENABLED" : "DISABLED");
  60         }
  61         mutex_unlock(&wl->mutex);
  62
  63         if (unlikely(report_change))
  64                 input_report_key(poll_dev->input, KEY_WLAN, enabled);
  65 }
  66
  67 /* Called when the RFKILL toggled in software. */
  68 static int b43_rfkill_soft_toggle(void *data, enum rfkill_state state)
  69 {
  70         struct b43_wldev *dev = data;
  71         struct b43_wl *wl = dev->wl;
  72         int err = 0;
  73
  74         if (!wl->rfkill.registered)
  75                 return 0;
  76
  77         mutex_lock(&wl->mutex);
  78         B43_WARN_ON(b43_status(dev) < B43_STAT_INITIALIZED);
  79         switch (state) {
  80         case RFKILL_STATE_ON:
  81                 if (!dev->radio_hw_enable) {
  82                         /* No luck. We can't toggle the hardware RF-kill
  83                          * button from software. */
  84                         err = -EBUSY;
  85                         goto out_unlock;
  86                 }
  87                 if (!dev->phy.radio_on)
  88                         b43_radio_turn_on(dev);
  89                 break;
  90         case RFKILL_STATE_OFF:
  91                 if (dev->phy.radio_on)
  92                         b43_radio_turn_off(dev, 0);
  93                 break;
  94         }
  95 out_unlock:
  96         mutex_unlock(&wl->mutex);
  97
  98         return err;
  99 }
 100
 101 char * b43_rfkill_led_name(struct b43_wldev *dev)
 102 {
 103         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 104
 105         if (!rfk->registered)
 106                 return NULL;
 107         return rfkill_get_led_name(rfk->rfkill);
 108 }
 109
 110 void b43_rfkill_init(struct b43_wldev *dev)
 111 {
 112         struct b43_wl *wl = dev->wl;
 113         struct b43_rfkill *rfk = &(wl->rfkill);
 114         int err;
 115
 116         rfk->registered = 0;
 117
 118         rfk->rfkill = rfkill_allocate(dev->dev->dev, RFKILL_TYPE_WLAN);
 119         if (!rfk->rfkill)
 120                 goto out_error;
 121         snprintf(rfk->name, sizeof(rfk->name),
 122                  "b43-%s", wiphy_name(wl->hw->wiphy));
 123         rfk->rfkill->name = rfk->name;
 124         rfk->rfkill->state = RFKILL_STATE_ON;
 125         rfk->rfkill->data = dev;
 126         rfk->rfkill->toggle_radio = b43_rfkill_soft_toggle;
 127         rfk->rfkill->user_claim_unsupported = 1;
 128
 129         rfk->poll_dev = input_allocate_polled_device();
 130         if (!rfk->poll_dev)
 131                 goto err_free_rfk;
 132         rfk->poll_dev->private = dev;
 133         rfk->poll_dev->poll = b43_rfkill_poll;
 134         rfk->poll_dev->poll_interval = 1000; /* msecs */
 135
 136         err = rfkill_register(rfk->rfkill);
 137         if (err)
 138                 goto err_free_polldev;
 139         err = input_register_polled_device(rfk->poll_dev);
 140         if (err)
 141                 goto err_unreg_rfk;
 142
 143         rfk->registered = 1;
 144
 145         return;
 146 err_unreg_rfk:
 147         rfkill_unregister(rfk->rfkill);
 148 err_free_polldev:
 149         input_free_polled_device(rfk->poll_dev);
 150         rfk->poll_dev = NULL;
 151 err_free_rfk:
 152         rfkill_free(rfk->rfkill);
 153         rfk->rfkill = NULL;
 154 out_error:
 155         rfk->registered = 0;
 156         b43warn(wl, "RF-kill button init failed\n");
 157 }
 158
 159 void b43_rfkill_exit(struct b43_wldev *dev)
 160 {
 161         struct b43_rfkill *rfk = &(dev->wl->rfkill);
 162
 163         if (!rfk->registered)
 164                 return;
 165         rfk->registered = 0;
 166
 167         input_unregister_polled_device(rfk->poll_dev);
 168         rfkill_unregister(rfk->rfkill);
 169         input_free_polled_device(rfk->poll_dev);
 170         rfk->poll_dev = NULL;
 171         rfkill_free(rfk->rfkill);
 172         rfk->rfkill = NULL;
 173 }