1/*
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 <linux/of.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;
34
35static void pmu_req_done(struct adb_request * req)
36{
37	unsigned long flags;
38
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);
48}
49
50static void pmu_led_set(struct led_classdev *led_cdev,
51			enum led_brightness brightness)
52{
53	unsigned long flags;
54
55	spin_lock_irqsave(&pmu_blink_lock, flags);
56	switch (brightness) {
57	case LED_OFF:
58		requested_change = 0;
59		break;
60	case LED_FULL:
61		requested_change = 1;
62		break;
63	default:
64		goto out;
65		break;
66	}
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);
70 out:
71 	spin_unlock_irqrestore(&pmu_blink_lock, flags);
72}
73
74static struct led_classdev pmu_led = {
75	.name = "pmu-led::front",
76#ifdef CONFIG_ADB_PMU_LED_DISK
77	.default_trigger = "disk-activity",
78#endif
79	.brightness_set = pmu_led_set,
80};
81
82static int __init via_pmu_led_init(void)
83{
84	struct device_node *dt;
85	const char *model;
86
87	/* only do this on keylargo based models */
88	if (pmu_get_model() != PMU_KEYLARGO_BASED)
89		return -ENODEV;
90
91	dt = of_find_node_by_path("/");
92	if (dt == NULL)
93		return -ENODEV;
94	model = of_get_property(dt, "model", NULL);
95	if (model == NULL) {
96		of_node_put(dt);
97		return -ENODEV;
98	}
99	if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
100	    strncmp(model, "iBook", strlen("iBook")) != 0 &&
101	    strcmp(model, "PowerMac7,2") != 0 &&
102	    strcmp(model, "PowerMac7,3") != 0) {
103		of_node_put(dt);
104		/* ignore */
105		return -ENODEV;
106	}
107	of_node_put(dt);
108
109	spin_lock_init(&pmu_blink_lock);
110	/* no outstanding req */
111	pmu_blink_req.complete = 1;
112	pmu_blink_req.done = pmu_req_done;
113
114	return led_classdev_register(NULL, &pmu_led);
115}
116
117late_initcall(via_pmu_led_init);
118