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 const 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
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