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;
35 static void pmu_req_done(struct adb_request * req)
39 spin_lock_irqsave(&pmu_blink_lock, flags);
40 /* if someone requested a change in the meantime
41 * (we only see the last one which is fine)
42 * then apply it now */
43 if (requested_change != -1 && !pmu_sys_suspended)
44 pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
45 /* reset requested change */
46 requested_change = -1;
47 spin_unlock_irqrestore(&pmu_blink_lock, flags);
50 static void pmu_led_set(struct led_classdev *led_cdev,
51 enum led_brightness brightness)
55 spin_lock_irqsave(&pmu_blink_lock, flags);
67 /* if request isn't done, then don't do anything */
68 if (pmu_blink_req.complete && !pmu_sys_suspended)
69 pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
71 spin_unlock_irqrestore(&pmu_blink_lock, flags);
74 static struct led_classdev pmu_led = {
75 .name = "pmu-front-led",
76 #ifdef CONFIG_ADB_PMU_LED_IDE
77 .default_trigger = "ide-disk",
79 .brightness_set = pmu_led_set,
82 static int __init via_pmu_led_init(void)
84 struct device_node *dt;
87 /* only do this on keylargo based models */
88 if (pmu_get_model() != PMU_KEYLARGO_BASED)
91 dt = of_find_node_by_path("/");
94 model = of_get_property(dt, "model", NULL);
97 if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
98 strncmp(model, "iBook", strlen("iBook")) != 0 &&
99 strcmp(model, "PowerMac7,2") != 0 &&
100 strcmp(model, "PowerMac7,3") != 0) {
107 spin_lock_init(&pmu_blink_lock);
108 /* no outstanding req */
109 pmu_blink_req.complete = 1;
110 pmu_blink_req.done = pmu_req_done;
112 return led_classdev_register(NULL, &pmu_led);
115 late_initcall(via_pmu_led_init);