drivers/net/wireless/rt2x00/rt2x00rfkill.c

   1 /*
   2         Copyright (C) 2004 - 2009 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
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31
  32 static void rt2x00rfkill_poll(struct input_polled_dev *poll_dev)
  33 {
  34         struct rt2x00_dev *rt2x00dev = poll_dev->private;
  35         int state, old_state;
  36
  37         if (!test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state) ||
  38             !test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
  39                 return;
  40
  41         /*
  42          * Poll latest state, if the state is different then the previous state,
  43          * we should generate an input event.
  44          */
  45         state = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
  46         old_state = !!test_bit(RFKILL_STATE_BLOCKED, &rt2x00dev->rfkill_state);
  47
  48         if (old_state != state) {
  49                 input_report_switch(poll_dev->input, SW_RFKILL_ALL, state);
  50                 change_bit(RFKILL_STATE_BLOCKED, &rt2x00dev->rfkill_state);
  51         }
  52 }
  53
  54 void rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
  55 {
  56         if (!test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state) ||
  57             test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
  58                 return;
  59
  60         if (input_register_polled_device(rt2x00dev->rfkill_poll_dev)) {
  61                 ERROR(rt2x00dev, "Failed to register polled device.\n");
  62                 return;
  63         }
  64
  65         __set_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
  66
  67         /*
  68          * Force initial poll which will detect the initial device state,
  69          * and correctly sends the signal to the input layer about this
  70          * state.
  71          */
  72         rt2x00rfkill_poll(rt2x00dev->rfkill_poll_dev);
  73 }
  74
  75 void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
  76 {
  77         if (!test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state) ||
  78             !test_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state))
  79                 return;
  80
  81         input_unregister_polled_device(rt2x00dev->rfkill_poll_dev);
  82
  83         __clear_bit(RFKILL_STATE_REGISTERED, &rt2x00dev->rfkill_state);
  84 }
  85
  86 void rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
  87 {
  88         struct input_polled_dev *poll_dev;
  89
  90         if (test_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state) ||
  91             !test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
  92                 return;
  93
  94         poll_dev = input_allocate_polled_device();
  95         if (!poll_dev) {
  96                 ERROR(rt2x00dev, "Failed to allocate polled device.\n");
  97                 return;
  98         }
  99
 100         poll_dev->private = rt2x00dev;
 101         poll_dev->poll = rt2x00rfkill_poll;
 102         poll_dev->poll_interval = RFKILL_POLL_INTERVAL;
 103
 104         poll_dev->input->name = rt2x00dev->ops->name;
 105         poll_dev->input->phys = wiphy_name(rt2x00dev->hw->wiphy);
 106         poll_dev->input->id.bustype = BUS_HOST;
 107         poll_dev->input->id.vendor = 0x1814;
 108         poll_dev->input->id.product = rt2x00dev->chip.rt;
 109         poll_dev->input->id.version = rt2x00dev->chip.rev;
 110         poll_dev->input->dev.parent = wiphy_dev(rt2x00dev->hw->wiphy);
 111         poll_dev->input->evbit[0] = BIT(EV_SW);
 112         poll_dev->input->swbit[0] = BIT(SW_RFKILL_ALL);
 113
 114         rt2x00dev->rfkill_poll_dev = poll_dev;
 115
 116         __set_bit(RFKILL_STATE_ALLOCATED, &rt2x00dev->rfkill_state);
 117 }
 118
 119 void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
 120 {
 121         if (!__test_and_clear_bit(RFKILL_STATE_ALLOCATED,
 122                                   &rt2x00dev->rfkill_state))
 123                 return;
 124
 125         input_free_polled_device(rt2x00dev->rfkill_poll_dev);
 126         rt2x00dev->rfkill_poll_dev = NULL;
 127 }