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/arch/powerpc/platforms/pseries/power.c

http://github.com/mirrors/linux
C | 72 lines | 51 code | 11 blank | 10 comment | 7 complexity | 0d5347c570b956a8a66ffd401a93dd45 MD5 | raw file
 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, "%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 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(power_kobj, &auto_poweron_attr.attr));
70}
71machine_device_initcall(pseries, apo_pm_init);
72#endif