2 * via-pmu LED class device
4 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 #include <linux/types.h>
23 #include <linux/kernel.h>
24 #include <linux/device.h>
25 #include <linux/leds.h>
26 #include <linux/adb.h>
27 #include <linux/pmu.h>
30 static spinlock_t pmu_blink_lock;
31 static struct adb_request pmu_blink_req;
32 /* -1: no change, 0: request off, 1: request on */
33 static int requested_change;
36 static void pmu_req_done(struct adb_request * req)
40 spin_lock_irqsave(&pmu_blink_lock, flags);
41 /* if someone requested a change in the meantime
42 * (we only see the last one which is fine)
43 * then apply it now */
44 if (requested_change != -1 && !sleeping)
45 pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
46 /* reset requested change */
47 requested_change = -1;
48 spin_unlock_irqrestore(&pmu_blink_lock, flags);
51 static void pmu_led_set(struct led_classdev *led_cdev,
52 enum led_brightness brightness)
56 spin_lock_irqsave(&pmu_blink_lock, flags);
68 /* if request isn't done, then don't do anything */
69 if (pmu_blink_req.complete && !sleeping)
70 pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
72 spin_unlock_irqrestore(&pmu_blink_lock, flags);
75 static struct led_classdev pmu_led = {
76 .name = "pmu-front-led",
77 #ifdef CONFIG_ADB_PMU_LED_IDE
78 .default_trigger = "ide-disk",
80 .brightness_set = pmu_led_set,
84 static int pmu_led_sleep_call(struct pmu_sleep_notifier *self, int when)
88 spin_lock_irqsave(&pmu_blink_lock, flags);
91 case PBOOK_SLEEP_REQUEST:
101 spin_unlock_irqrestore(&pmu_blink_lock, flags);
103 return PBOOK_SLEEP_OK;
106 static struct pmu_sleep_notifier via_pmu_led_sleep_notif = {
107 .notifier_call = pmu_led_sleep_call,
111 static int __init via_pmu_led_init(void)
113 struct device_node *dt;
116 /* only do this on keylargo based models */
117 if (pmu_get_model() != PMU_KEYLARGO_BASED)
120 dt = of_find_node_by_path("/");
123 model = get_property(dt, "model", NULL);
126 if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
127 strncmp(model, "iBook", strlen("iBook")) != 0) {
134 spin_lock_init(&pmu_blink_lock);
135 /* no outstanding req */
136 pmu_blink_req.complete = 1;
137 pmu_blink_req.done = pmu_req_done;
139 pmu_register_sleep_notifier(&via_pmu_led_sleep_notif);
141 return led_classdev_register(NULL, &pmu_led);
144 late_initcall(via_pmu_led_init);