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
20unsigned long rtas_poweron_auto; /* default and normal state is 0 */
21
22static ssize_t auto_poweron_show(struct kobject *kobj,
23 struct kobj_attribute *attr, char *buf)
24{
25 return sprintf(buf, fmt: "%lu\n", rtas_poweron_auto);
26}
27
28static 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
43static struct kobj_attribute auto_poweron_attr =
44 __ATTR(auto_poweron, 0644, auto_poweron_show, auto_poweron_store);
45
46#ifndef CONFIG_PM
47struct kobject *power_kobj;
48
49static struct attribute *g[] = {
50 &auto_poweron_attr.attr,
51 NULL,
52};
53
54static const struct attribute_group attr_group = {
55 .attrs = g,
56};
57
58static 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}
65machine_core_initcall(pseries, pm_init);
66#else
67static int __init apo_pm_init(void)
68{
69 return (sysfs_create_file(kobj: power_kobj, attr: &auto_poweron_attr.attr));
70}
71machine_device_initcall(pseries, apo_pm_init);
72#endif
73

source code of linux/arch/powerpc/platforms/pseries/power.c