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