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, fmt: "%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(kobj: power_kobj, attr: &auto_poweron_attr.attr)); |
70 | } |
71 | machine_device_initcall(pseries, apo_pm_init); |
72 | #endif |
73 | |