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Johannes Berg70c39672006-06-21 12:11:16 +02001/*
2 * via-pmu LED class device
3 *
4 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
5 *
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.
10 *
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
15 * details.
16 *
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
20 *
21 */
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>
28#include <asm/prom.h>
29
30static spinlock_t pmu_blink_lock;
31static struct adb_request pmu_blink_req;
32/* -1: no change, 0: request off, 1: request on */
33static int requested_change;
34static int sleeping;
35
36static void pmu_req_done(struct adb_request * req)
37{
38 unsigned long flags;
39
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);
49}
50
51static void pmu_led_set(struct led_classdev *led_cdev,
52 enum led_brightness brightness)
53{
54 unsigned long flags;
55
56 spin_lock_irqsave(&pmu_blink_lock, flags);
57 switch (brightness) {
58 case LED_OFF:
59 requested_change = 0;
60 break;
61 case LED_FULL:
62 requested_change = 1;
63 break;
64 default:
65 goto out;
66 break;
67 }
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);
71 out:
72 spin_unlock_irqrestore(&pmu_blink_lock, flags);
73}
74
75static struct led_classdev pmu_led = {
76 .name = "pmu-front-led",
Johannes Berg3a09aa42006-07-03 14:28:14 +020077#ifdef CONFIG_ADB_PMU_LED_IDE
Johannes Berg70c39672006-06-21 12:11:16 +020078 .default_trigger = "ide-disk",
79#endif
80 .brightness_set = pmu_led_set,
81};
82
83#ifdef CONFIG_PM
84static int pmu_led_sleep_call(struct pmu_sleep_notifier *self, int when)
85{
86 unsigned long flags;
87
88 spin_lock_irqsave(&pmu_blink_lock, flags);
89
90 switch (when) {
91 case PBOOK_SLEEP_REQUEST:
92 sleeping = 1;
93 break;
94 case PBOOK_WAKE:
95 sleeping = 0;
96 break;
97 default:
98 /* do nothing */
99 break;
100 }
101 spin_unlock_irqrestore(&pmu_blink_lock, flags);
102
103 return PBOOK_SLEEP_OK;
104}
105
106static struct pmu_sleep_notifier via_pmu_led_sleep_notif = {
107 .notifier_call = pmu_led_sleep_call,
108};
109#endif
110
111static int __init via_pmu_led_init(void)
112{
113 struct device_node *dt;
114 const char *model;
115
116 /* only do this on keylargo based models */
117 if (pmu_get_model() != PMU_KEYLARGO_BASED)
118 return -ENODEV;
119
120 dt = of_find_node_by_path("/");
121 if (dt == NULL)
122 return -ENODEV;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000123 model = get_property(dt, "model", NULL);
Johannes Berg70c39672006-06-21 12:11:16 +0200124 if (model == NULL)
125 return -ENODEV;
126 if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
127 strncmp(model, "iBook", strlen("iBook")) != 0) {
128 of_node_put(dt);
129 /* ignore */
130 return -ENODEV;
131 }
132 of_node_put(dt);
133
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;
138#ifdef CONFIG_PM
139 pmu_register_sleep_notifier(&via_pmu_led_sleep_notif);
140#endif
141 return led_classdev_register(NULL, &pmu_led);
142}
143
144late_initcall(via_pmu_led_init);