src/drivers/net/ath5k/ath5k_rfkill.c

   1 /*
   2  * RFKILL support for ath5k
   3  *
   4  * Copyright (c) 2009 Tobias Doerffel <tobias.doerffel@gmail.com>
   5  * Lightly modified for gPXE, Sep 2008 by Joshua Oreman <oremanj@rwcr.net>
   6  *
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer,
  14  *    without modification.
  15  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  16  *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
  17  *    redistribution must be conditioned upon including a substantially
  18  *    similar Disclaimer requirement for further binary redistribution.
  19  * 3. Neither the names of the above-listed copyright holders nor the names
  20  *    of any contributors may be used to endorse or promote products derived
  21  *    from this software without specific prior written permission.
  22  *
  23  * NO WARRANTY
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
  27  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  28  * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
  29  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  32  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  34  * THE POSSIBILITY OF SUCH DAMAGES.
  35  */
  36
  37 FILE_LICENCE ( MIT );
  38
  39 #include "base.h"
  40
  41
  42 static inline void ath5k_rfkill_disable(struct ath5k_softc *sc)
  43 {
  44         DBG("ath5k: rfkill disable (gpio:%d polarity:%d)\n",
  45             sc->rf_kill.gpio, sc->rf_kill.polarity);
  46         ath5k_hw_set_gpio_output(sc->ah, sc->rf_kill.gpio);
  47         ath5k_hw_set_gpio(sc->ah, sc->rf_kill.gpio, !sc->rf_kill.polarity);
  48 }
  49
  50
  51 static inline void ath5k_rfkill_enable(struct ath5k_softc *sc)
  52 {
  53         DBG("ath5k: rfkill enable (gpio:%d polarity:%d)\n",
  54             sc->rf_kill.gpio, sc->rf_kill.polarity);
  55         ath5k_hw_set_gpio_output(sc->ah, sc->rf_kill.gpio);
  56         ath5k_hw_set_gpio(sc->ah, sc->rf_kill.gpio, sc->rf_kill.polarity);
  57 }
  58
  59 static inline void ath5k_rfkill_set_intr(struct ath5k_softc *sc, int enable)
  60 {
  61         struct ath5k_hw *ah = sc->ah;
  62         u32 curval;
  63
  64         ath5k_hw_set_gpio_input(ah, sc->rf_kill.gpio);
  65         curval = ath5k_hw_get_gpio(ah, sc->rf_kill.gpio);
  66         ath5k_hw_set_gpio_intr(ah, sc->rf_kill.gpio, enable ?
  67                                !!curval : !curval);
  68 }
  69
  70 static int __unused
  71 ath5k_is_rfkill_set(struct ath5k_softc *sc)
  72 {
  73         /* configuring GPIO for input for some reason disables rfkill */
  74         /*ath5k_hw_set_gpio_input(sc->ah, sc->rf_kill.gpio);*/
  75         return (ath5k_hw_get_gpio(sc->ah, sc->rf_kill.gpio) ==
  76                 sc->rf_kill.polarity);
  77 }
  78
  79 void
  80 ath5k_rfkill_hw_start(struct ath5k_hw *ah)
  81 {
  82         struct ath5k_softc *sc = ah->ah_sc;
  83
  84         /* read rfkill GPIO configuration from EEPROM header */
  85         sc->rf_kill.gpio = ah->ah_capabilities.cap_eeprom.ee_rfkill_pin;
  86         sc->rf_kill.polarity = ah->ah_capabilities.cap_eeprom.ee_rfkill_pol;
  87
  88         ath5k_rfkill_disable(sc);
  89
  90         /* enable interrupt for rfkill switch */
  91         if (AR5K_EEPROM_HDR_RFKILL(ah->ah_capabilities.cap_eeprom.ee_header))
  92                 ath5k_rfkill_set_intr(sc, 1);
  93 }
  94
  95
  96 void
  97 ath5k_rfkill_hw_stop(struct ath5k_hw *ah)
  98 {
  99         struct ath5k_softc *sc = ah->ah_sc;
 100
 101         /* disable interrupt for rfkill switch */
 102         if (AR5K_EEPROM_HDR_RFKILL(ah->ah_capabilities.cap_eeprom.ee_header))
 103                 ath5k_rfkill_set_intr(sc, 0);
 104
 105         /* enable RFKILL when stopping HW so Wifi LED is turned off */
 106         ath5k_rfkill_enable(sc);
 107 }