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 
29 unsigned long rtas_poweron_auto; /* default and normal state is 0 */
30 
31 static ssize_t auto_poweron_show(struct kset *kset, char *buf)
32 {
33         return sprintf(buf, "%lu\n", rtas_poweron_auto);
34 }
35 
36 static ssize_t
37 auto_poweron_store(struct kset *kset, const char *buf, size_t n)
38 {
39 	int ret;
40 	unsigned long ups_restart;
41 	ret = sscanf(buf, "%lu", &ups_restart);
42 
43 	if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
44 		rtas_poweron_auto = ups_restart;
45 		return n;
46 	}
47 	return -EINVAL;
48 }
49 
50 static struct subsys_attribute auto_poweron_attr = {
51         .attr   = {
52                 .name = __stringify(auto_poweron),
53                 .mode = 0644,
54         },
55         .show   = auto_poweron_show,
56         .store  = auto_poweron_store,
57 };
58 
59 #ifndef CONFIG_PM
60 decl_subsys(power,NULL,NULL);
61 
62 static struct attribute *g[] = {
63         &auto_poweron_attr.attr,
64         NULL,
65 };
66 
67 static struct attribute_group attr_group = {
68         .attrs = g,
69 };
70 
71 static int __init pm_init(void)
72 {
73         int error = subsystem_register(&power_subsys);
74         if (!error)
75                 error = sysfs_create_group(&power_subsys.kobj, &attr_group);
76         return error;
77 }
78 core_initcall(pm_init);
79 #else
80 extern struct kset power_subsys;
81 
82 static int __init apo_pm_init(void)
83 {
84 	return (subsys_create_file(&power_subsys, &auto_poweron_attr));
85 }
86 __initcall(apo_pm_init);
87 #endif
88