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 #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 int rt2x00rfkill_register(struct rt2x00_dev *rt2x00dev)
  73 {
  74         int retval;
  75
  76         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
  77                 return 0;
  78
  79         retval = rfkill_register(rt2x00dev->rfkill);
  80         if (retval) {
  81                 ERROR(rt2x00dev, "Failed to register rfkill handler.\n");
  82                 return retval;
  83         }
  84
  85         retval = input_register_polled_device(rt2x00dev->poll_dev);
  86         if (retval) {
  87                 ERROR(rt2x00dev, "Failed to register polled device.\n");
  88                 rfkill_unregister(rt2x00dev->rfkill);
  89                 return retval;
  90         }
  91
  92         /*
  93          * Force initial poll which will detect the initial device state,
  94          * and correctly sends the signal to the rfkill layer about this
  95          * state.
  96          */
  97         rt2x00rfkill_poll(rt2x00dev->poll_dev);
  98
  99         return 0;
 100 }
 101
 102 void rt2x00rfkill_unregister(struct rt2x00_dev *rt2x00dev)
 103 {
 104         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 105                 return;
 106
 107         input_unregister_polled_device(rt2x00dev->poll_dev);
 108         rfkill_unregister(rt2x00dev->rfkill);
 109 }
 110
 111 int rt2x00rfkill_allocate(struct rt2x00_dev *rt2x00dev)
 112 {
 113         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
 114
 115         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 116                 return 0;
 117
 118         rt2x00dev->rfkill = rfkill_allocate(device, RFKILL_TYPE_WLAN);
 119         if (!rt2x00dev->rfkill) {
 120                 ERROR(rt2x00dev, "Failed to allocate rfkill handler.\n");
 121                 goto exit;
 122         }
 123
 124         rt2x00dev->rfkill->name = rt2x00dev->ops->name;
 125         rt2x00dev->rfkill->data = rt2x00dev;
 126         rt2x00dev->rfkill->state = -1;
 127         rt2x00dev->rfkill->toggle_radio = rt2x00rfkill_toggle_radio;
 128
 129         rt2x00dev->poll_dev = input_allocate_polled_device();
 130         if (!rt2x00dev->poll_dev) {
 131                 ERROR(rt2x00dev, "Failed to allocate polled device.\n");
 132                 goto exit_free_rfkill;
 133         }
 134
 135         rt2x00dev->poll_dev->private = rt2x00dev;
 136         rt2x00dev->poll_dev->poll = rt2x00rfkill_poll;
 137         rt2x00dev->poll_dev->poll_interval = RFKILL_POLL_INTERVAL;
 138
 139         rt2x00dev->poll_dev->input->name = rt2x00dev->ops->name;
 140         rt2x00dev->poll_dev->input->phys = wiphy_name(rt2x00dev->hw->wiphy);
 141         rt2x00dev->poll_dev->input->id.bustype = BUS_HOST;
 142         rt2x00dev->poll_dev->input->id.vendor = 0x1814;
 143         rt2x00dev->poll_dev->input->id.product = rt2x00dev->chip.rt;
 144         rt2x00dev->poll_dev->input->id.version = rt2x00dev->chip.rev;
 145         rt2x00dev->poll_dev->input->dev.parent = device;
 146         rt2x00dev->poll_dev->input->evbit[0] = BIT(EV_KEY);
 147         set_bit(KEY_WLAN, rt2x00dev->poll_dev->input->keybit);
 148
 149         return 0;
 150
 151 exit_free_polldev:
 152         input_free_polled_device(rt2x00dev->poll_dev);
 153
 154 exit_free_rfkill:
 155         rfkill_free(rt2x00dev->rfkill);
 156
 157 exit:
 158         return -ENOMEM;
 159 }
 160
 161 void rt2x00rfkill_free(struct rt2x00_dev *rt2x00dev)
 162 {
 163         if (!test_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags))
 164                 return;
 165
 166         input_free_device(rt2x00dev->poll_dev->input);
 167         input_free_polled_device(rt2x00dev->poll_dev);
 168         rfkill_free(rt2x00dev->rfkill);
 169 }