1 /*
2  * Atheros CARL9170 driver
3  *
4  * LED handling
5  *
6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
7  * Copyright 2009, 2010, Christian Lamparer <chunkeey@googlemail.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; see the file COPYING.  If not, see
21  * http://www.gnu.org/licenses/.
22  *
23  * This file incorporates work covered by the following copyright and
24  * permission notice:
25  *    Copyright (c) 2007-2008 Atheros Communications, Inc.
26  *
27  *    Permission to use, copy, modify, and/or distribute this software for any
28  *    purpose with or without fee is hereby granted, provided that the above
29  *    copyright notice and this permission notice appear in all copies.
30  *
31  *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
32  *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
33  *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
34  *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
35  *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
36  *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
37  *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
38  */
39 
40 #include "carl9170.h"
41 #include "cmd.h"
42 
43 int carl9170_led_set_state(struct ar9170 *ar, const u32 led_state)
44 {
45 	return carl9170_write_reg(ar, AR9170_GPIO_REG_PORT_DATA, led_state);
46 }
47 
48 int carl9170_led_init(struct ar9170 *ar)
49 {
50 	int err;
51 
52 	/* disable LEDs */
53 	/* GPIO [0/1 mode: output, 2/3: input] */
54 	err = carl9170_write_reg(ar, AR9170_GPIO_REG_PORT_TYPE, 3);
55 	if (err)
56 		goto out;
57 
58 	/* GPIO 0/1 value: off */
59 	err = carl9170_led_set_state(ar, 0);
60 
61 out:
62 	return err;
63 }
64 
65 #ifdef CONFIG_CARL9170_LEDS
66 static void carl9170_led_update(struct work_struct *work)
67 {
68 	struct ar9170 *ar = container_of(work, struct ar9170, led_work.work);
69 	int i, tmp = 300, blink_delay = 1000;
70 	u32 led_val = 0;
71 	bool rerun = false;
72 
73 	if (!IS_ACCEPTING_CMD(ar))
74 		return;
75 
76 	mutex_lock(&ar->mutex);
77 	for (i = 0; i < AR9170_NUM_LEDS; i++) {
78 		if (ar->leds[i].registered) {
79 			if (ar->leds[i].last_state ||
80 			    ar->leds[i].toggled) {
81 
82 				if (ar->leds[i].toggled)
83 					tmp = 70 + 200 / (ar->leds[i].toggled);
84 
85 				if (tmp < blink_delay)
86 					blink_delay = tmp;
87 
88 				led_val |= 1 << i;
89 				ar->leds[i].toggled = 0;
90 				rerun = true;
91 			}
92 		}
93 	}
94 
95 	carl9170_led_set_state(ar, led_val);
96 	mutex_unlock(&ar->mutex);
97 
98 	if (!rerun)
99 		return;
100 
101 	ieee80211_queue_delayed_work(ar->hw,
102 				     &ar->led_work,
103 				     msecs_to_jiffies(blink_delay));
104 }
105 
106 static void carl9170_led_set_brightness(struct led_classdev *led,
107 					enum led_brightness brightness)
108 {
109 	struct carl9170_led *arl = container_of(led, struct carl9170_led, l);
110 	struct ar9170 *ar = arl->ar;
111 
112 	if (!arl->registered)
113 		return;
114 
115 	if (arl->last_state != !!brightness) {
116 		arl->toggled++;
117 		arl->last_state = !!brightness;
118 	}
119 
120 	if (likely(IS_ACCEPTING_CMD(ar) && arl->toggled))
121 		ieee80211_queue_delayed_work(ar->hw, &ar->led_work, HZ / 10);
122 }
123 
124 static int carl9170_led_register_led(struct ar9170 *ar, int i, char *name,
125 				     char *trigger)
126 {
127 	int err;
128 
129 	snprintf(ar->leds[i].name, sizeof(ar->leds[i].name),
130 		 "carl9170-%s::%s", wiphy_name(ar->hw->wiphy), name);
131 
132 	ar->leds[i].ar = ar;
133 	ar->leds[i].l.name = ar->leds[i].name;
134 	ar->leds[i].l.brightness_set = carl9170_led_set_brightness;
135 	ar->leds[i].l.brightness = 0;
136 	ar->leds[i].l.default_trigger = trigger;
137 
138 	err = led_classdev_register(wiphy_dev(ar->hw->wiphy),
139 				    &ar->leds[i].l);
140 	if (err) {
141 		wiphy_err(ar->hw->wiphy, "failed to register %s LED (%d).\n",
142 			ar->leds[i].name, err);
143 	} else {
144 		ar->leds[i].registered = true;
145 	}
146 
147 	return err;
148 }
149 
150 void carl9170_led_unregister(struct ar9170 *ar)
151 {
152 	int i;
153 
154 	for (i = 0; i < AR9170_NUM_LEDS; i++)
155 		if (ar->leds[i].registered) {
156 			led_classdev_unregister(&ar->leds[i].l);
157 			ar->leds[i].registered = false;
158 			ar->leds[i].toggled = 0;
159 		}
160 
161 	cancel_delayed_work_sync(&ar->led_work);
162 }
163 
164 int carl9170_led_register(struct ar9170 *ar)
165 {
166 	int err;
167 
168 	INIT_DELAYED_WORK(&ar->led_work, carl9170_led_update);
169 
170 	err = carl9170_led_register_led(ar, 0, "tx",
171 					ieee80211_get_tx_led_name(ar->hw));
172 	if (err)
173 		goto fail;
174 
175 	if (ar->features & CARL9170_ONE_LED)
176 		return 0;
177 
178 	err = carl9170_led_register_led(ar, 1, "assoc",
179 					ieee80211_get_assoc_led_name(ar->hw));
180 	if (err)
181 		goto fail;
182 
183 	return 0;
184 
185 fail:
186 	carl9170_led_unregister(ar);
187 	return err;
188 }
189 
190 #endif /* CONFIG_CARL9170_LEDS */
191