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
37FILE_LICENCE ( MIT );
38
39#include "base.h"
40
41
42static 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
51static 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
59static 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
70static int __unused
71ath5k_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
79void
80ath5k_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
96void
97ath5k_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}
108