drivers/net/wireless/rt2x00/rt2x00rfkill.c

   1 /*
   2         Copyright (C) 2004 - 2007 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 /*
  27  * Set enviroment defines for rt2x00.h
  28  */
  29 #define DRV_NAME "rt2x00lib"
  30
  31 #include <linux/input-polldev.h>
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/rfkill.h>
  35
  36 #include "rt2x00.h"
  37 #include "rt2x00lib.h"
  38
  39 static int rt2x00rfkill_toggle_radio(void *data, enum rfkill_state state)
  40 {
  41         struct rt2x00_dev *rt2x00dev = data;
  42         int retval = 0;
  43
  44         if (unlikely(!rt2x00dev))
  45                 return 0;
  46
  47         /*
  48          * Only continue if we have an active interface,
  49          * either monitor or non-monitor should be present.
  50          */
  51         if (!is_interface_present(&rt2x00dev->interface) &&
  52             !is_monitor_present(&rt2x00dev->interface))
  53                 return 0;
  54
  55         if (state == RFKILL_STATE_ON) {
  56                 INFO(rt2x00dev, "Hardware button pressed, enabling radio.\n");
  57                 __set_bit(DEVICE_ENABLED_RADIO_HW, &rt2x00dev->flags);
  58                 retval = rt2x00lib_enable_radio(rt2x00dev);
  59         } else if (state == RFKILL_STATE_OFF) {
  60                 INFO(rt2x00dev, "Hardware button pressed, disabling radio.\n");
  61                 __clear_bit(DEVICE_ENABLED_RADIO_HW, &rt2x00dev->flags);
  62                 rt2x00lib_disable_radio(rt2x00dev);
  63         }
  64
  65         return retval;
  66 }
  67
  68 static void rt2x00rfkill_poll(struct input_polled_dev *poll_dev)
  69 {
  70         struct rt2x00_dev *rt2x00dev = poll_dev->private;
  71         int state = rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
  72
  73         if (rt2x00dev->rfkill->state != state)
  74                 input_report_key(poll_dev->input, KEY_WLAN, 1);
  75 }
  76
  77 int rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
  78 {
  79         int retval;
  80
  81         if (!test_bit(DEVICE_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
  82                 return 0;
  83
  84         retval = rfkill_register(rt2x00dev->rfkill);
  85         if (retval) {
  86                 ERROR(rt2x00dev, "Failed to register rfkill handler.\n");
  87                 return retval;
  88         }
  89
  90         retval = input_register_polled_device(rt2x00dev->poll_dev);
  91         if (retval) {
  92                 ERROR(rt2x00dev, "Failed to register polled device.\n");
  93                 rfkill_unregister(rt2x00dev->rfkill);
  94                 return retval;
  95         }
  96
  97         return 0;
  98 }
  99
 100 void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
 101 {
 102         if (!test_bit(DEVICE_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 103                 return;
 104
 105         input_unregister_polled_device(rt2x00dev->poll_dev);
 106         rfkill_unregister(rt2x00dev->rfkill);
 107 }
 108
 109 int rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
 110 {
 111         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
 112
 113         if (!test_bit(DEVICE_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 114                 return 0;
 115
 116         rt2x00dev->rfkill = rfkill_allocate(device, RFKILL_TYPE_WLAN);
 117         if (!rt2x00dev->rfkill) {
 118                 ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n");
 119                 return -ENOMEM;
 120         }
 121
 122         rt2x00dev->rfkill->name = rt2x00dev->ops->name;
 123         rt2x00dev->rfkill->data = rt2x00dev;
 124         rt2x00dev->rfkill->state = rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
 125         rt2x00dev->rfkill->toggle_radio = rt2x00rfkill_toggle_radio;
 126
 127         rt2x00dev->poll_dev = input_allocate_polled_device();
 128         if (!rt2x00dev->poll_dev) {
 129                 ERROR(rt2x00dev, "Failed to allocate polled device.\n");
 130                 rfkill_free(rt2x00dev->rfkill);
 131                 return -ENOMEM;
 132         }
 133
 134         rt2x00dev->poll_dev->private = rt2x00dev;
 135         rt2x00dev->poll_dev->poll = rt2x00rfkill_poll;
 136         rt2x00dev->poll_dev->poll_interval = RFKILL_POLL_INTERVAL;
 137
 138         return 0;
 139 }
 140
 141 void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
 142 {
 143         if (!test_bit(DEVICE_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 144                 return;
 145
 146         input_free_polled_device(rt2x00dev->poll_dev);
 147         rfkill_free(rt2x00dev->rfkill);
 148 }