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/input-polldev.h>
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/rfkill.h>
  30
  31 #include "rt2x00.h"
  32 #include "rt2x00lib.h"
  33
  34 static int rt2x00rfkill_toggle_radio(void *data, enum rfkill_state state)
  35 {
  36         struct rt2x00_dev *rt2x00dev = data;
  37         int retval = 0;
  38
  39         if (unlikely(!rt2x00dev))
  40                 return 0;
  41
  42         /*
  43          * Only continue if there are enabled interfaces.
  44          */
  45         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
  46                 return 0;
  47
  48         if (state == RFKILL_STATE_ON) {
  49                 INFO(rt2x00dev, "Hardware button pressed, enabling radio.\n");
  50                 __clear_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
  51                 retval = rt2x00lib_enable_radio(rt2x00dev);
  52         } else if (state == RFKILL_STATE_OFF) {
  53                 INFO(rt2x00dev, "Hardware button pressed, disabling radio.\n");
  54                 __set_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
  55                 rt2x00lib_disable_radio(rt2x00dev);
  56         }
  57
  58         return retval;
  59 }
  60
  61 static void rt2x00rfkill_poll(struct input_polled_dev *poll_dev)
  62 {
  63         struct rt2x00_dev *rt2x00dev = poll_dev->private;
  64         int state = rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
  65
  66         if (rt2x00dev->rfkill->state != state) {
  67                 input_report_key(poll_dev->input, KEY_WLAN, 1);
  68                 input_report_key(poll_dev->input, KEY_WLAN, 0);
  69         }
  70 }
  71
  72 void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
  73 {
  74         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
  75             !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
  76                 return;
  77
  78         if (rfkill_register(rt2x00dev->rfkill)) {
  79                 ERROR(rt2x00dev, "Failed to register rfkill handler.\n");
  80                 return;
  81         }
  82
  83         if (input_register_polled_device(rt2x00dev->poll_dev)) {
  84                 ERROR(rt2x00dev, "Failed to register polled device.\n");
  85                 rfkill_unregister(rt2x00dev->rfkill);
  86                 return;
  87         }
  88
  89         __set_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
  90
  91         /*
  92          * Force initial poll which will detect the initial device state,
  93          * and correctly sends the signal to the rfkill layer about this
  94          * state.
  95          */
  96         rt2x00rfkill_poll(rt2x00dev->poll_dev);
  97 }
  98
  99 void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
 100 {
 101         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
 102             !test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
 103                 return;
 104
 105         input_unregister_polled_device(rt2x00dev->poll_dev);
 106         rfkill_unregister(rt2x00dev->rfkill);
 107
 108         __clear_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
 109 }
 110
 111 static struct input_polled_dev *
 112 rt2x00rfkill_allocate_polldev(struct rt2x00_dev *rt2x00dev)
 113 {
 114         struct input_polled_dev *poll_dev;
 115
 116         poll_dev = input_allocate_polled_device();
 117         if (!poll_dev)
 118                 return NULL;
 119
 120         poll_dev->private = rt2x00dev;
 121         poll_dev->poll = rt2x00rfkill_poll;
 122         poll_dev->poll_interval = RFKILL_POLL_INTERVAL;
 123
 124         poll_dev->input->name = rt2x00dev->ops->name;
 125         poll_dev->input->phys = wiphy_name(rt2x00dev->hw->wiphy);
 126         poll_dev->input->id.bustype = BUS_HOST;
 127         poll_dev->input->id.vendor = 0x1814;
 128         poll_dev->input->id.product = rt2x00dev->chip.rt;
 129         poll_dev->input->id.version = rt2x00dev->chip.rev;
 130         poll_dev->input->dev.parent = wiphy_dev(rt2x00dev->hw->wiphy);
 131         poll_dev->input->evbit[0] = BIT(EV_KEY);
 132         set_bit(KEY_WLAN, poll_dev->input->keybit);
 133
 134         return poll_dev;
 135 }
 136
 137 void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
 138 {
 139         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 140                 return;
 141
 142         rt2x00dev->rfkill =
 143             rfkill_allocate(wiphy_dev(rt2x00dev->hw->wiphy), RFKILL_TYPE_WLAN);
 144         if (!rt2x00dev->rfkill) {
 145                 ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n");
 146                 return;
 147         }
 148
 149         rt2x00dev->rfkill->name = rt2x00dev->ops->name;
 150         rt2x00dev->rfkill->data = rt2x00dev;
 151         rt2x00dev->rfkill->state = -1;
 152         rt2x00dev->rfkill->toggle_radio = rt2x00rfkill_toggle_radio;
 153
 154         rt2x00dev->poll_dev = rt2x00rfkill_allocate_polldev(rt2x00dev);
 155         if (!rt2x00dev->poll_dev) {
 156                 ERROR(rt2x00dev, "Failed to allocate polled device.\n");
 157                 rfkill_free(rt2x00dev->rfkill);
 158                 rt2x00dev->rfkill = NULL;
 159                 return;
 160         }
 161
 162         return;
 163 }
 164
 165 void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
 166 {
 167         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
 168             !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
 169                 return;
 170
 171         input_free_polled_device(rt2x00dev->poll_dev);
 172         rt2x00dev->poll_dev = NULL;
 173
 174         rfkill_free(rt2x00dev->rfkill);
 175         rt2x00dev->rfkill = NULL;
 176 }
 177
 178 void rt2x00rfkill_suspend(struct rt2x00_dev *rt2x00dev)
 179 {
 180         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
 181             !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
 182                 return;
 183
 184         input_free_polled_device(rt2x00dev->poll_dev);
 185         rt2x00dev->poll_dev = NULL;
 186 }
 187
 188 void rt2x00rfkill_resume(struct rt2x00_dev *rt2x00dev)
 189 {
 190         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
 191             !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
 192                 return;
 193
 194         rt2x00dev->poll_dev = rt2x00rfkill_allocate_polldev(rt2x00dev);
 195         if (!rt2x00dev->poll_dev) {
 196                 ERROR(rt2x00dev, "Failed to allocate polled device.\n");
 197                 return;
 198         }
 199 }