arch/powerpc/platforms/pseries/power.c

   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