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

   1/*
   2 *  Interface for power-management for ppc64 compliant platform
   3 *
   4 *  Manish Ahuja <mahuja@us.ibm.com>
   5 *
   6 *  Feb 2007
   7 *
   8 *  Copyright (C) 2007 IBM Corporation.
   9 *
  10 *  This program is free software; you can redistribute it and/or modify
  11 *  it under the terms of the GNU General Public License as published by
  12 *  the Free Software Foundation; version 2 of the License.
  13 *
  14 *  This program is distributed in the hope that it will be useful,
  15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 *  GNU General Public License for more details.
  18 *
  19 *  You should have received a copy of the GNU General Public License
  20 *  along with this program; if not, write to the Free Software
  21 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22 */
  23
  24#include <linux/kobject.h>
  25#include <linux/string.h>
  26#include <linux/errno.h>
  27#include <linux/init.h>
  28
  29unsigned long rtas_poweron_auto; /* default and normal state is 0 */
  30
  31static ssize_t auto_poweron_show(struct kobject *kobj,
  32                                 struct kobj_attribute *attr, char *buf)
  33{
  34        return sprintf(buf, "%lu\n", rtas_poweron_auto);
  35}
  36
  37static ssize_t auto_poweron_store(struct kobject *kobj,
  38                                  struct kobj_attribute *attr,
  39                                  const char *buf, size_t n)
  40{
  41        int ret;
  42        unsigned long ups_restart;
  43        ret = sscanf(buf, "%lu", &ups_restart);
  44
  45        if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
  46                rtas_poweron_auto = ups_restart;
  47                return n;
  48        }
  49        return -EINVAL;
  50}
  51
  52static struct kobj_attribute auto_poweron_attr =
  53        __ATTR(auto_poweron, 0644, auto_poweron_show, auto_poweron_store);
  54
  55#ifndef CONFIG_PM
  56struct kobject *power_kobj;
  57
  58static struct attribute *g[] = {
  59        &auto_poweron_attr.attr,
  60        NULL,
  61};
  62
  63static struct attribute_group attr_group = {
  64        .attrs = g,
  65};
  66
  67static int __init pm_init(void)
  68{
  69        power_kobj = kobject_create_and_add("power", NULL);
  70        if (!power_kobj)
  71                return -ENOMEM;
  72        return sysfs_create_group(power_kobj, &attr_group);
  73}
  74core_initcall(pm_init);
  75#else
  76static int __init apo_pm_init(void)
  77{
  78        return (sysfs_create_file(power_kobj, &auto_poweron_attr.attr));
  79}
  80__initcall(apo_pm_init);
  81#endif
  82