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_UNBLOCKED) {
  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_SOFT_BLOCKED) {
  53                 INFO(rt2x00dev, "Hardware button pressed, disabling radio.\n");
  54                 __set_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
  55                 rt2x00lib_disable_radio(rt2x00dev);
  56         } else {
  57                 WARNING(rt2x00dev, "Received unexpected rfkill state %d.\n",
  58                         state);
  59         }
  60
  61         return retval;
  62 }
  63
  64 static void rt2x00rfkill_poll(struct input_polled_dev *poll_dev)
  65 {
  66         struct rt2x00_dev *rt2x00dev = poll_dev->private;
  67         int state = rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
  68
  69         if (rt2x00dev->rfkill->state != state) {
  70                 input_report_key(poll_dev->input, KEY_WLAN, 1);
  71                 input_report_key(poll_dev->input, KEY_WLAN, 0);
  72         }
  73 }
  74
  75 void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
  76 {
  77         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
  78             !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
  79                 return;
  80
  81         if (rfkill_register(rt2x00dev->rfkill)) {
  82                 ERROR(rt2x00dev, "Failed to register rfkill handler.\n");
  83                 return;
  84         }
  85
  86         if (input_register_polled_device(rt2x00dev->poll_dev)) {
  87                 ERROR(rt2x00dev, "Failed to register polled device.\n");
  88                 rfkill_unregister(rt2x00dev->rfkill);
  89                 return;
  90         }
  91
  92         __set_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
  93
  94         /*
  95          * Force initial poll which will detect the initial device state,
  96          * and correctly sends the signal to the rfkill layer about this
  97          * state.
  98          */
  99         rt2x00rfkill_poll(rt2x00dev->poll_dev);
 100 }
 101
 102 void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
 103 {
 104         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
 105             !test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
 106                 return;
 107
 108         input_unregister_polled_device(rt2x00dev->poll_dev);
 109         rfkill_unregister(rt2x00dev->rfkill);
 110
 111         __clear_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
 112 }
 113
 114 static struct input_polled_dev *
 115 rt2x00rfkill_allocate_polldev(struct rt2x00_dev *rt2x00dev)
 116 {
 117         struct input_polled_dev *poll_dev;
 118
 119         poll_dev = input_allocate_polled_device();
 120         if (!poll_dev)
 121                 return NULL;
 122
 123         poll_dev->private = rt2x00dev;
 124         poll_dev->poll = rt2x00rfkill_poll;
 125         poll_dev->poll_interval = RFKILL_POLL_INTERVAL;
 126
 127         poll_dev->input->name = rt2x00dev->ops->name;
 128         poll_dev->input->phys = wiphy_name(rt2x00dev->hw->wiphy);
 129         poll_dev->input->id.bustype = BUS_HOST;
 130         poll_dev->input->id.vendor = 0x1814;
 131         poll_dev->input->id.product = rt2x00dev->chip.rt;
 132         poll_dev->input->id.version = rt2x00dev->chip.rev;
 133         poll_dev->input->dev.parent = wiphy_dev(rt2x00dev->hw->wiphy);
 134         poll_dev->input->evbit[0] = BIT(EV_KEY);
 135         set_bit(KEY_WLAN, poll_dev->input->keybit);
 136
 137         return poll_dev;
 138 }
 139
 140 void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
 141 {
 142         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 143                 return;
 144
 145         rt2x00dev->rfkill =
 146             rfkill_allocate(wiphy_dev(rt2x00dev->hw->wiphy), RFKILL_TYPE_WLAN);
 147         if (!rt2x00dev->rfkill) {
 148                 ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n");
 149                 return;
 150         }
 151
 152         rt2x00dev->rfkill->name = rt2x00dev->ops->name;
 153         rt2x00dev->rfkill->data = rt2x00dev;
 154         rt2x00dev->rfkill->state = -1;
 155         rt2x00dev->rfkill->toggle_radio = rt2x00rfkill_toggle_radio;
 156
 157         rt2x00dev->poll_dev = rt2x00rfkill_allocate_polldev(rt2x00dev);
 158         if (!rt2x00dev->poll_dev) {
 159                 ERROR(rt2x00dev, "Failed to allocate polled device.\n");
 160                 rfkill_free(rt2x00dev->rfkill);
 161                 rt2x00dev->rfkill = NULL;
 162                 return;
 163         }
 164
 165         return;
 166 }
 167
 168 void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
 169 {
 170         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
 171             !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
 172                 return;
 173
 174         input_free_polled_device(rt2x00dev->poll_dev);
 175         rt2x00dev->poll_dev = NULL;
 176
 177         rfkill_free(rt2x00dev->rfkill);
 178         rt2x00dev->rfkill = NULL;
 179 }
 180
 181 void rt2x00rfkill_suspend(struct rt2x00_dev *rt2x00dev)
 182 {
 183         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
 184             !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
 185                 return;
 186
 187         input_free_polled_device(rt2x00dev->poll_dev);
 188         rt2x00dev->poll_dev = NULL;
 189 }
 190
 191 void rt2x00rfkill_resume(struct rt2x00_dev *rt2x00dev)
 192 {
 193         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags) ||
 194             !test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state))
 195                 return;
 196
 197         rt2x00dev->poll_dev = rt2x00rfkill_allocate_polldev(rt2x00dev);
 198         if (!rt2x00dev->poll_dev) {
 199                 ERROR(rt2x00dev, "Failed to allocate polled device.\n");
 200                 return;
 201         }
 202 }