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 
117