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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2008 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  * James P. Ketrenos <ipw2100-admin@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/version.h>
  31 #include <linux/init.h>
  32
  33 #include <net/mac80211.h>
  34
  35 #include "iwl-eeprom.h"
  36 #include "iwl-dev.h"
  37 #include "iwl-core.h"
  38 #include "iwl-helpers.h"
  39
  40
  41 /* software rf-kill from user */
  42 static int iwl_rfkill_soft_rf_kill(void *data, enum rfkill_state state)
  43 {
  44         struct iwl_priv *priv = data;
  45         int err = 0;
  46
  47         if (!priv->rfkill)
  48                 return 0;
  49
  50         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
  51                 return 0;
  52
  53         IWL_DEBUG_RF_KILL("we received soft RFKILL set to state %d\n", state);
  54         mutex_lock(&priv->mutex);
  55
  56         switch (state) {
  57         case RFKILL_STATE_UNBLOCKED:
  58                 if (iwl_is_rfkill_hw(priv)) {
  59                         err = -EBUSY;
  60                         goto out_unlock;
  61                 }
  62                 iwl_radio_kill_sw_enable_radio(priv);
  63                 break;
  64         case RFKILL_STATE_SOFT_BLOCKED:
  65                 iwl_radio_kill_sw_disable_radio(priv);
  66                 break;
  67         default:
  68                 IWL_WARNING("we recieved unexpected RFKILL state %d\n", state);
  69                 break;
  70         }
  71 out_unlock:
  72         mutex_unlock(&priv->mutex);
  73
  74         return err;
  75 }
  76
  77 int iwl_rfkill_init(struct iwl_priv *priv)
  78 {
  79         struct device *device = wiphy_dev(priv->hw->wiphy);
  80         int ret = 0;
  81
  82         BUG_ON(device == NULL);
  83
  84         IWL_DEBUG_RF_KILL("Initializing RFKILL.\n");
  85         priv->rfkill = rfkill_allocate(device, RFKILL_TYPE_WLAN);
  86         if (!priv->rfkill) {
  87                 IWL_ERROR("Unable to allocate rfkill device.\n");
  88                 ret = -ENOMEM;
  89                 goto error;
  90         }
  91
  92         priv->rfkill->name = priv->cfg->name;
  93         priv->rfkill->data = priv;
  94         priv->rfkill->state = RFKILL_STATE_UNBLOCKED;
  95         priv->rfkill->toggle_radio = iwl_rfkill_soft_rf_kill;
  96         priv->rfkill->user_claim_unsupported = 1;
  97
  98         priv->rfkill->dev.class->suspend = NULL;
  99         priv->rfkill->dev.class->resume = NULL;
 100
 101         ret = rfkill_register(priv->rfkill);
 102         if (ret) {
 103                 IWL_ERROR("Unable to register rfkill: %d\n", ret);
 104                 goto free_rfkill;
 105         }
 106
 107         IWL_DEBUG_RF_KILL("RFKILL initialization complete.\n");
 108         return ret;
 109
 110 free_rfkill:
 111         if (priv->rfkill != NULL)
 112                 rfkill_free(priv->rfkill);
 113         priv->rfkill = NULL;
 114
 115 error:
 116         IWL_DEBUG_RF_KILL("RFKILL initialization complete.\n");
 117         return ret;
 118 }
 119 EXPORT_SYMBOL(iwl_rfkill_init);
 120
 121 void iwl_rfkill_unregister(struct iwl_priv *priv)
 122 {
 123
 124         if (priv->rfkill)
 125                 rfkill_unregister(priv->rfkill);
 126
 127         priv->rfkill = NULL;
 128 }
 129 EXPORT_SYMBOL(iwl_rfkill_unregister);
 130
 131 /* set rf-kill to the right state. */
 132 void iwl_rfkill_set_hw_state(struct iwl_priv *priv)
 133 {
 134         if (!priv->rfkill)
 135                 return;
 136
 137         if (iwl_is_rfkill_hw(priv)) {
 138                 rfkill_force_state(priv->rfkill, RFKILL_STATE_HARD_BLOCKED);
 139                 return;
 140         }
 141
 142         if (!iwl_is_rfkill_sw(priv))
 143                 rfkill_force_state(priv->rfkill, RFKILL_STATE_UNBLOCKED);
 144         else
 145                 rfkill_force_state(priv->rfkill, RFKILL_STATE_SOFT_BLOCKED);
 146 }
 147 EXPORT_SYMBOL(iwl_rfkill_set_hw_state);