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
  29 unsigned long rtas_poweron_auto; /* default and normal state is 0 */
  30
  31 static 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
  37 static 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
  52 static struct kobj_attribute auto_poweron_attr =
  53         __ATTR(auto_poweron, 0644, auto_poweron_show, auto_poweron_store);
  54
  55 #ifndef CONFIG_PM
  56 struct kobject *power_kobj;
  57
  58 static struct attribute *g[] = {
  59         &auto_poweron_attr.attr,
  60         NULL,
  61 };
  62
  63 static struct attribute_group attr_group = {
  64         .attrs = g,
  65 };
  66
  67 static 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 }
  74 core_initcall(pm_init);
  75 #else
  76 static int __init apo_pm_init(void)
  77 {
  78         return (sysfs_create_file(power_kobj, &auto_poweron_attr));
  79 }
  80 __initcall(apo_pm_init);
  81 #endif