1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  Interface for power-management for ppc64 compliant platform
4  *
5  *  Manish Ahuja <mahuja@us.ibm.com>
6  *
7  *  Feb 2007
8  *
9  *  Copyright (C) 2007 IBM Corporation.
10  */
11 
12 #include <linux/kobject.h>
13 #include <linux/string.h>
14 #include <linux/errno.h>
15 #include <linux/init.h>
16 #include <asm/machdep.h>
17 
18 #include "pseries.h"
19 
20 unsigned long rtas_poweron_auto; /* default and normal state is 0 */
21 
22 static ssize_t auto_poweron_show(struct kobject *kobj,
23 				 struct kobj_attribute *attr, char *buf)
24 {
25         return sprintf(buf, "%lu\n", rtas_poweron_auto);
26 }
27 
28 static ssize_t auto_poweron_store(struct kobject *kobj,
29 				  struct kobj_attribute *attr,
30 				  const char *buf, size_t n)
31 {
32 	int ret;
33 	unsigned long ups_restart;
34 	ret = sscanf(buf, "%lu", &ups_restart);
35 
36 	if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
37 		rtas_poweron_auto = ups_restart;
38 		return n;
39 	}
40 	return -EINVAL;
41 }
42 
43 static struct kobj_attribute auto_poweron_attr =
44 	__ATTR(auto_poweron, 0644, auto_poweron_show, auto_poweron_store);
45 
46 #ifndef CONFIG_PM
47 struct kobject *power_kobj;
48 
49 static struct attribute *g[] = {
50         &auto_poweron_attr.attr,
51         NULL,
52 };
53 
54 static struct attribute_group attr_group = {
55         .attrs = g,
56 };
57 
58 static int __init pm_init(void)
59 {
60 	power_kobj = kobject_create_and_add("power", NULL);
61 	if (!power_kobj)
62 		return -ENOMEM;
63 	return sysfs_create_group(power_kobj, &attr_group);
64 }
65 machine_core_initcall(pseries, pm_init);
66 #else
67 static int __init apo_pm_init(void)
68 {
69 	return (sysfs_create_file(power_kobj, &auto_poweron_attr.attr));
70 }
71 machine_device_initcall(pseries, apo_pm_init);
72 #endif
73