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 there are enabled interfaces.
  49          */
  50         if (!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
  51                 return 0;
  52
  53         if (state == RFKILL_STATE_ON) {
  54                 INFO(rt2x00dev, "Hardware button pressed, enabling radio.\n");
  55                 __clear_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
  56                 retval = rt2x00lib_enable_radio(rt2x00dev);
  57         } else if (state == RFKILL_STATE_OFF) {
  58                 INFO(rt2x00dev, "Hardware button pressed, disabling radio.\n");
  59                 __set_bit(DEVICE_DISABLED_RADIO_HW, &rt2x00dev->flags);
  60                 rt2x00lib_disable_radio(rt2x00dev);
  61         }
  62
  63         return retval;
  64 }
  65
  66 static void rt2x00rfkill_poll(struct input_polled_dev *poll_dev)
  67 {
  68         struct rt2x00_dev *rt2x00dev = poll_dev->private;
  69         int state = rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
  70
  71         if (rt2x00dev->rfkill->state != state) {
  72                 input_report_key(poll_dev->input, KEY_WLAN, 1);
  73                 input_report_key(poll_dev->input, KEY_WLAN, 0);
  74         }
  75 }
  76
  77 int rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
  78 {
  79         int retval;
  80
  81         if (!test_bit(CONFIG_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         /*
  98          * Force initial poll which will detect the initial device state,
  99          * and correctly sends the signal to the rfkill layer about this
 100          * state.
 101          */
 102         rt2x00rfkill_poll(rt2x00dev->poll_dev);
 103
 104         return 0;
 105 }
 106
 107 void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
 108 {
 109         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 110                 return;
 111
 112         input_unregister_polled_device(rt2x00dev->poll_dev);
 113         rfkill_unregister(rt2x00dev->rfkill);
 114 }
 115
 116 int rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
 117 {
 118         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
 119
 120         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 121                 return 0;
 122
 123         rt2x00dev->rfkill = rfkill_allocate(device, RFKILL_TYPE_WLAN);
 124         if (!rt2x00dev->rfkill) {
 125                 ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n");
 126                 goto exit;
 127         }
 128
 129         rt2x00dev->rfkill->name = rt2x00dev->ops->name;
 130         rt2x00dev->rfkill->data = rt2x00dev;
 131         rt2x00dev->rfkill->state = -1;
 132         rt2x00dev->rfkill->toggle_radio = rt2x00rfkill_toggle_radio;
 133
 134         rt2x00dev->poll_dev = input_allocate_polled_device();
 135         if (!rt2x00dev->poll_dev) {
 136                 ERROR(rt2x00dev, "Failed to allocate polled device.\n");
 137                 goto exit_free_rfkill;
 138         }
 139
 140         rt2x00dev->poll_dev->private = rt2x00dev;
 141         rt2x00dev->poll_dev->poll = rt2x00rfkill_poll;
 142         rt2x00dev->poll_dev->poll_interval = RFKILL_POLL_INTERVAL;
 143
 144         rt2x00dev->poll_dev->input = input_allocate_device();
 145         if (!rt2x00dev->poll_dev->input) {
 146                 ERROR(rt2x00dev, "Failed to allocate input device.\n");
 147                 goto exit_free_polldev;
 148         }
 149
 150         rt2x00dev->poll_dev->input->name = rt2x00dev->ops->name;
 151         rt2x00dev->poll_dev->input->phys = wiphy_name(rt2x00dev->hw->wiphy);
 152         rt2x00dev->poll_dev->input->id.bustype = BUS_HOST;
 153         rt2x00dev->poll_dev->input->id.vendor = 0x1814;
 154         rt2x00dev->poll_dev->input->id.product = rt2x00dev->chip.rt;
 155         rt2x00dev->poll_dev->input->id.version = rt2x00dev->chip.rev;
 156         rt2x00dev->poll_dev->input->dev.parent = device;
 157         rt2x00dev->poll_dev->input->evbit[0] = BIT(EV_KEY);
 158         set_bit(KEY_WLAN, rt2x00dev->poll_dev->input->keybit);
 159
 160         return 0;
 161
 162 exit_free_polldev:
 163         input_free_polled_device(rt2x00dev->poll_dev);
 164
 165 exit_free_rfkill:
 166         rfkill_free(rt2x00dev->rfkill);
 167
 168 exit:
 169         return -ENOMEM;
 170 }
 171
 172 void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
 173 {
 174         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 175                 return;
 176
 177         input_free_device(rt2x00dev->poll_dev->input);
 178         input_free_polled_device(rt2x00dev->poll_dev);
 179         rfkill_free(rt2x00dev->rfkill);
 180 }