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_STATE_STARTED, &rt2x00dev->flags))
  45                 return 0;
  46
  47         if (state == RFKILL_STATE_UNBLOCKED) {
  48                 INFO(rt2x00dev, "RFKILL event: enabling radio.\n");
  49                 clear_bit(DEVICE_STATE_DISABLED_RADIO_HW, &rt2x00dev->flags);
  50                 retval = rt2x00lib_enable_radio(rt2x00dev);
  51         } else if (state == RFKILL_STATE_SOFT_BLOCKED) {
  52                 INFO(rt2x00dev, "RFKILL event: disabling radio.\n");
  53                 set_bit(DEVICE_STATE_DISABLED_RADIO_HW, &rt2x00dev->flags);
  54                 rt2x00lib_disable_radio(rt2x00dev);
  55         } else {
  56                 WARNING(rt2x00dev, "RFKILL event: unknown state %d.\n", state);
  57         }
  58
  59         return retval;
  60 }
  61
  62 static int rt2x00rfkill_get_state(void *data, enum rfkill_state *state)
  63 {
  64         struct rt2x00_dev *rt2x00dev = data;
  65
  66         /*
  67          * rfkill_poll reports 1 when the key has been pressed and the
  68          * radio should be blocked.
  69          */
  70         *state = rt2x00dev->ops->lib->rfkill_poll(rt2x00dev) ?
  71             RFKILL_STATE_SOFT_BLOCKED : RFKILL_STATE_UNBLOCKED;
  72
  73         return 0;
  74 }
  75
  76 static void rt2x00rfkill_poll(struct work_struct *work)
  77 {
  78         struct rt2x00_dev *rt2x00dev =
  79             container_of(work, struct rt2x00_dev, rfkill_work.work);
  80         enum rfkill_state state;
  81
  82         if (!test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state) ||
  83             !test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
  84                 return;
  85
  86         /*
  87          * Poll latest state and report it to rfkill who should sort
  88          * out if the state should be toggled or not.
  89          */
  90         if (!rt2x00rfkill_get_state(rt2x00dev, &state))
  91                 rfkill_force_state(rt2x00dev->rfkill, state);
  92
  93         queue_delayed_work(rt2x00dev->hw->workqueue,
  94                            &rt2x00dev->rfkill_work, RFKILL_POLL_INTERVAL);
  95 }
  96
  97 void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
  98 {
  99         if (!test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state) ||
 100             test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
 101                 return;
 102
 103         if (rfkill_register(rt2x00dev->rfkill)) {
 104                 ERROR(rt2x00dev, "Failed to register rfkill handler.\n");
 105                 return;
 106         }
 107
 108         __set_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
 109
 110         /*
 111          * Force initial poll which will detect the initial device state,
 112          * and correctly sends the signal to the rfkill layer about this
 113          * state.
 114          */
 115         rt2x00rfkill_poll(&rt2x00dev->rfkill_work.work);
 116 }
 117
 118 void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
 119 {
 120         if (!test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state) ||
 121             !test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
 122                 return;
 123
 124         cancel_delayed_work_sync(&rt2x00dev->rfkill_work);
 125
 126         rfkill_unregister(rt2x00dev->rfkill);
 127
 128         __clear_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
 129 }
 130
 131 void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
 132 {
 133         struct device *dev = wiphy_dev(rt2x00dev->hw->wiphy);
 134
 135         if (test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
 136                 return;
 137
 138         rt2x00dev->rfkill = rfkill_allocate(dev, RFKILL_TYPE_WLAN);
 139         if (!rt2x00dev->rfkill) {
 140                 ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n");
 141                 return;
 142         }
 143
 144         __set_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state);
 145
 146         rt2x00dev->rfkill->name = rt2x00dev->ops->name;
 147         rt2x00dev->rfkill->data = rt2x00dev;
 148         rt2x00dev->rfkill->toggle_radio = rt2x00rfkill_toggle_radio;
 149         if (test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags)) {
 150                 rt2x00dev->rfkill->get_state = rt2x00rfkill_get_state;
 151                 rt2x00dev->rfkill->state =
 152                         rt2x00dev->ops->lib->rfkill_poll(rt2x00dev) ?
 153                             RFKILL_STATE_SOFT_BLOCKED : RFKILL_STATE_UNBLOCKED;
 154         } else {
 155                 rt2x00dev->rfkill->state = RFKILL_STATE_UNBLOCKED;
 156         }
 157
 158         INIT_DELAYED_WORK(&rt2x00dev->rfkill_work, rt2x00rfkill_poll);
 159
 160         return;
 161 }
 162
 163 void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
 164 {
 165         if (!test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
 166                 return;
 167
 168         cancel_delayed_work_sync(&rt2x00dev->rfkill_work);
 169
 170         rfkill_free(rt2x00dev->rfkill);
 171         rt2x00dev->rfkill = NULL;
 172 }