1/*
2 *  Interface for power-management for ppc64 compliant platform
3 *
4 *  Manish Ahuja <mahuja@us.ibm.com>
5 *
6 *  Feb 2007
7 *
8 *  Copyright (C) 2007 IBM Corporation.
9 *
10 *  This program is free software; you can redistribute it and/or modify
11 *  it under the terms of the GNU General Public License as published by
12 *  the Free Software Foundation; version 2 of the License.
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; if not, write to the Free Software
21 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22 */
23
24#include <linux/kobject.h>
25#include <linux/string.h>
26#include <linux/errno.h>
27#include <linux/init.h>
28#include <asm/machdep.h>
29
30unsigned long rtas_poweron_auto; /* default and normal state is 0 */
31
32static ssize_t auto_poweron_show(struct kobject *kobj,
33				 struct kobj_attribute *attr, char *buf)
34{
35        return sprintf(buf, "%lu\n", rtas_poweron_auto);
36}
37
38static ssize_t auto_poweron_store(struct kobject *kobj,
39				  struct kobj_attribute *attr,
40				  const char *buf, size_t n)
41{
42	int ret;
43	unsigned long ups_restart;
44	ret = sscanf(buf, "%lu", &ups_restart);
45
46	if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
47		rtas_poweron_auto = ups_restart;
48		return n;
49	}
50	return -EINVAL;
51}
52
53static struct kobj_attribute auto_poweron_attr =
54	__ATTR(auto_poweron, 0644, auto_poweron_show, auto_poweron_store);
55
56#ifndef CONFIG_PM
57struct kobject *power_kobj;
58
59static struct attribute *g[] = {
60        &auto_poweron_attr.attr,
61        NULL,
62};
63
64static struct attribute_group attr_group = {
65        .attrs = g,
66};
67
68static int __init pm_init(void)
69{
70	power_kobj = kobject_create_and_add("power", NULL);
71	if (!power_kobj)
72		return -ENOMEM;
73	return sysfs_create_group(power_kobj, &attr_group);
74}
75machine_core_initcall(pseries, pm_init);
76#else
77static int __init apo_pm_init(void)
78{
79	return (sysfs_create_file(power_kobj, &auto_poweron_attr.attr));
80}
81machine_device_initcall(pseries, apo_pm_init);
82#endif
83