drivers/net/wireless/iwlwifi/iwl-rfkill.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31
  32 #include <net/mac80211.h>
  33
  34 #include "iwl-eeprom.h"
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37
  38 /* software rf-kill from user */
  39 static int iwl_rfkill_soft_rf_kill(void *data, enum rfkill_state state)
  40 {
  41         struct iwl_priv *priv = data;
  42         int err = 0;
  43
  44         if (!priv->rfkill)
  45                 return 0;
  46
  47         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
  48                 return 0;
  49
  50         IWL_DEBUG_RF_KILL(priv, "we received soft RFKILL set to state %d\n", state);
  51         mutex_lock(&priv->mutex);
  52
  53         switch (state) {
  54         case RFKILL_STATE_UNBLOCKED:
  55                 if (iwl_is_rfkill_hw(priv)) {
  56                         err = -EBUSY;
  57                         goto out_unlock;
  58                 }
  59                 iwl_radio_kill_sw_enable_radio(priv);
  60                 break;
  61         case RFKILL_STATE_SOFT_BLOCKED:
  62                 iwl_radio_kill_sw_disable_radio(priv);
  63                 break;
  64         default:
  65                 IWL_WARN(priv, "we received unexpected RFKILL state %d\n",
  66                         state);
  67                 break;
  68         }
  69 out_unlock:
  70         mutex_unlock(&priv->mutex);
  71
  72         return err;
  73 }
  74
  75 int iwl_rfkill_init(struct iwl_priv *priv)
  76 {
  77         struct device *device = wiphy_dev(priv->hw->wiphy);
  78         int ret = 0;
  79
  80         BUG_ON(device == NULL);
  81
  82         IWL_DEBUG_RF_KILL(priv, "Initializing RFKILL.\n");
  83         priv->rfkill = rfkill_allocate(device, RFKILL_TYPE_WLAN);
  84         if (!priv->rfkill) {
  85                 IWL_ERR(priv, "Unable to allocate RFKILL device.\n");
  86                 ret = -ENOMEM;
  87                 goto error;
  88         }
  89
  90         priv->rfkill->name = priv->cfg->name;
  91         priv->rfkill->data = priv;
  92         priv->rfkill->state = RFKILL_STATE_UNBLOCKED;
  93         priv->rfkill->toggle_radio = iwl_rfkill_soft_rf_kill;
  94
  95         priv->rfkill->dev.class->suspend = NULL;
  96         priv->rfkill->dev.class->resume = NULL;
  97
  98         ret = rfkill_register(priv->rfkill);
  99         if (ret) {
 100                 IWL_ERR(priv, "Unable to register RFKILL: %d\n", ret);
 101                 goto free_rfkill;
 102         }
 103
 104         IWL_DEBUG_RF_KILL(priv, "RFKILL initialization complete.\n");
 105         return ret;
 106
 107 free_rfkill:
 108         if (priv->rfkill != NULL)
 109                 rfkill_free(priv->rfkill);
 110         priv->rfkill = NULL;
 111
 112 error:
 113         IWL_DEBUG_RF_KILL(priv, "RFKILL initialization complete.\n");
 114         return ret;
 115 }
 116 EXPORT_SYMBOL(iwl_rfkill_init);
 117
 118 void iwl_rfkill_unregister(struct iwl_priv *priv)
 119 {
 120
 121         if (priv->rfkill)
 122                 rfkill_unregister(priv->rfkill);
 123
 124         priv->rfkill = NULL;
 125 }
 126 EXPORT_SYMBOL(iwl_rfkill_unregister);
 127
 128 /* set RFKILL to the right state. */
 129 void iwl_rfkill_set_hw_state(struct iwl_priv *priv)
 130 {
 131         if (!priv->rfkill)
 132                 return;
 133
 134         if (iwl_is_rfkill_hw(priv)) {
 135                 rfkill_force_state(priv->rfkill, RFKILL_STATE_HARD_BLOCKED);
 136                 return;
 137         }
 138
 139         if (!iwl_is_rfkill_sw(priv))
 140                 rfkill_force_state(priv->rfkill, RFKILL_STATE_UNBLOCKED);
 141         else
 142                 rfkill_force_state(priv->rfkill, RFKILL_STATE_SOFT_BLOCKED);
 143 }
 144 EXPORT_SYMBOL(iwl_rfkill_set_hw_state);