drivers/net/wireless/ath/ath5k/rfkill.c

   1 /*
   2  * RFKILL support for ath5k
   3  *
   4  * Copyright (c) 2009 Tobias Doerffel <tobias.doerffel@gmail.com>
   5  *
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer,
  13  *    without modification.
  14  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  15  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
  16  *    redistribution must be conditioned upon including a substantially
  17  *    similar Disclaimer requirement for further binary redistribution.
  18  * 3. Neither the names of the above-listed copyright holders nor the names
  19  *    of any contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * NO WARRANTY
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
  26  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  27  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
  28  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  31  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  33  * THE POSSIBILITY OF SUCH DAMAGES.
  34  */
  35
  36 #include "ath5k.h"
  37
  38
  39 static inline void ath5k_rfkill_disable(struct ath5k_hw *ah)
  40 {
  41         ATH5K_DBG(ah, ATH5K_DEBUG_ANY, "rfkill disable (gpio:%d polarity:%d)\n",
  42                 ah->rf_kill.gpio, ah->rf_kill.polarity);
  43         ath5k_hw_set_gpio_output(ah, ah->rf_kill.gpio);
  44         ath5k_hw_set_gpio(ah, ah->rf_kill.gpio, !ah->rf_kill.polarity);
  45 }
  46
  47
  48 static inline void ath5k_rfkill_enable(struct ath5k_hw *ah)
  49 {
  50         ATH5K_DBG(ah, ATH5K_DEBUG_ANY, "rfkill enable (gpio:%d polarity:%d)\n",
  51                 ah->rf_kill.gpio, ah->rf_kill.polarity);
  52         ath5k_hw_set_gpio_output(ah, ah->rf_kill.gpio);
  53         ath5k_hw_set_gpio(ah, ah->rf_kill.gpio, ah->rf_kill.polarity);
  54 }
  55
  56 static inline void ath5k_rfkill_set_intr(struct ath5k_hw *ah, bool enable)
  57 {
  58         u32 curval;
  59
  60         ath5k_hw_set_gpio_input(ah, ah->rf_kill.gpio);
  61         curval = ath5k_hw_get_gpio(ah, ah->rf_kill.gpio);
  62         ath5k_hw_set_gpio_intr(ah, ah->rf_kill.gpio, enable ?
  63                                         !!curval : !curval);
  64 }
  65
  66 static bool
  67 ath5k_is_rfkill_set(struct ath5k_hw *ah)
  68 {
  69         /* configuring GPIO for input for some reason disables rfkill */
  70         /*ath5k_hw_set_gpio_input(ah, ah->rf_kill.gpio);*/
  71         return ath5k_hw_get_gpio(ah, ah->rf_kill.gpio) ==
  72                                                         ah->rf_kill.polarity;
  73 }
  74
  75 static void
  76 ath5k_tasklet_rfkill_toggle(unsigned long data)
  77 {
  78         struct ath5k_hw *ah = (void *)data;
  79         bool blocked;
  80
  81         blocked = ath5k_is_rfkill_set(ah);
  82         wiphy_rfkill_set_hw_state(ah->hw->wiphy, blocked);
  83 }
  84
  85
  86 void
  87 ath5k_rfkill_hw_start(struct ath5k_hw *ah)
  88 {
  89         /* read rfkill GPIO configuration from EEPROM header */
  90         ah->rf_kill.gpio = ah->ah_capabilities.cap_eeprom.ee_rfkill_pin;
  91         ah->rf_kill.polarity = ah->ah_capabilities.cap_eeprom.ee_rfkill_pol;
  92
  93         tasklet_init(&ah->rf_kill.toggleq, ath5k_tasklet_rfkill_toggle,
  94                 (unsigned long)ah);
  95
  96         ath5k_rfkill_disable(ah);
  97
  98         /* enable interrupt for rfkill switch */
  99         if (AR5K_EEPROM_HDR_RFKILL(ah->ah_capabilities.cap_eeprom.ee_header))
 100                 ath5k_rfkill_set_intr(ah, true);
 101 }
 102
 103
 104 void
 105 ath5k_rfkill_hw_stop(struct ath5k_hw *ah)
 106 {
 107         /* disable interrupt for rfkill switch */
 108         if (AR5K_EEPROM_HDR_RFKILL(ah->ah_capabilities.cap_eeprom.ee_header))
 109                 ath5k_rfkill_set_intr(ah, false);
 110
 111         tasklet_kill(&ah->rf_kill.toggleq);
 112
 113         /* enable RFKILL when stopping HW so Wifi LED is turned off */
 114         ath5k_rfkill_enable(ah);
 115 }
 116