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 
30 unsigned long rtas_poweron_auto; /* default and normal state is 0 */
31 
32 static 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 
38 static 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 
53 static struct kobj_attribute auto_poweron_attr =
54 	__ATTR(auto_poweron, 0644, auto_poweron_show, auto_poweron_store);
55 
56 #ifndef CONFIG_PM
57 struct kobject *power_kobj;
58 
59 static struct attribute *g[] = {
60         &auto_poweron_attr.attr,
61         NULL,
62 };
63 
64 static struct attribute_group attr_group = {
65         .attrs = g,
66 };
67 
68 static 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 }
75 machine_core_initcall(pseries, pm_init);
76 #else
77 static int __init apo_pm_init(void)
78 {
79 	return (sysfs_create_file(power_kobj, &auto_poweron_attr.attr));
80 }
81 machine_device_initcall(pseries, apo_pm_init);
82 #endif
83