drivers/net/wireless/rt2x00/rt2x00rfkill.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   3         <http://rt2x00.serialmonkey.com>
   4
   5         This program is free software; you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation; either version 2 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program; if not, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00rfkill
  23         Abstract: rt2x00 rfkill routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/rfkill.h>
  29
  30 #include "rt2x00.h"
  31 #include "rt2x00lib.h"
  32
  33 static int rt2x00rfkill_toggle_radio(void *data, enum rfkill_state state)
  34 {
  35         struct rt2x00_dev *rt2x00dev = data;
  36         int retval = 0;
  37
  38         if (unlikely(!rt2x00dev))
  39                 return 0;
  40
  41         /*
  42          * Only continue if there are enabled interfaces.
  43          */
  44         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
  45                 return 0;
  46
  47         if (state == RFKILL_STATE_UNBLOCKED) {
  48                 INFO(rt2x00dev, "Hardware button pressed, enabling radio.\n");
  49                 __clear_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
  50                 retval = rt2x00lib_enable_radio(rt2x00dev);
  51         } else if (state == RFKILL_STATE_SOFT_BLOCKED) {
  52                 INFO(rt2x00dev, "Hardware button pressed, disabling radio.\n");
  53                 __set_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
  54                 rt2x00lib_disable_radio(rt2x00dev);
  55         } else {
  56                 WARNING(rt2x00dev, "Received unexpected rfkill state %d.\n",
  57                         state);
  58         }
  59
  60         return retval;
  61 }
  62
  63 static int rt2x00rfkill_get_state(void *data, enum rfkill_state *state)
  64 {
  65         struct rt2x00_dev *rt2x00dev = data;
  66
  67         *state = rt2x00dev->rfkill->state;
  68
  69         return 0;
  70 }
  71
  72 static void rt2x00rfkill_poll(struct work_struct *work)
  73 {
  74         struct rt2x00_dev *rt2x00dev =
  75             container_of(work, struct rt2x00_dev, rfkill_work.work);
  76         int state;
  77
  78         if (!test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
  79                 return;
  80
  81         /*
  82          * rfkill_poll reports 1 when the key has been pressed and the
  83          * radio should be blocked.
  84          */
  85         state = !rt2x00dev->ops->lib->rfkill_poll(rt2x00dev) ?
  86             RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
  87
  88         rfkill_force_state(rt2x00dev->rfkill, state);
  89
  90         queue_delayed_work(rt2x00dev->hw->workqueue,
  91                            &rt2x00dev->rfkill_work, RFKILL_POLL_INTERVAL);
  92 }
  93
  94 void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
  95 {
  96         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
  97             !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
  98                 return;
  99
 100         if (rfkill_register(rt2x00dev->rfkill)) {
 101                 ERROR(rt2x00dev, "Failed to register rfkill handler.\n");
 102                 return;
 103         }
 104
 105         __set_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
 106
 107         /*
 108          * Force initial poll which will detect the initial device state,
 109          * and correctly sends the signal to the rfkill layer about this
 110          * state.
 111          */
 112         rt2x00rfkill_poll(&rt2x00dev->rfkill_work.work);
 113 }
 114
 115 void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
 116 {
 117         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
 118             !test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
 119                 return;
 120
 121         cancel_delayed_work_sync(&rt2x00dev->rfkill_work);
 122
 123         rfkill_unregister(rt2x00dev->rfkill);
 124
 125         __clear_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
 126 }
 127
 128 void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
 129 {
 130         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 131                 return;
 132
 133         rt2x00dev->rfkill =
 134             rfkill_allocate(wiphy_dev(rt2x00dev->hw->wiphy), RFKILL_TYPE_WLAN);
 135         if (!rt2x00dev->rfkill) {
 136                 ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n");
 137                 return;
 138         }
 139
 140         rt2x00dev->rfkill->name = rt2x00dev->ops->name;
 141         rt2x00dev->rfkill->data = rt2x00dev;
 142         rt2x00dev->rfkill->state = -1;
 143         rt2x00dev->rfkill->toggle_radio = rt2x00rfkill_toggle_radio;
 144         rt2x00dev->rfkill->get_state = rt2x00rfkill_get_state;
 145
 146         INIT_DELAYED_WORK(&rt2x00dev->rfkill_work, rt2x00rfkill_poll);
 147
 148         return;
 149 }
 150
 151 void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
 152 {
 153         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
 154             !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
 155                 return;
 156
 157         cancel_delayed_work_sync(&rt2x00dev->rfkill_work);
 158
 159         rfkill_free(rt2x00dev->rfkill);
 160         rt2x00dev->rfkill = NULL;
 161 }