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 kset *kset, char *buf)
  32 {
  33         return sprintf(buf, "%lu\n", rtas_poweron_auto);
  34 }
  35
  36 static ssize_t
  37 auto_poweron_store(struct kset *kset, const char *buf, size_t n)
  38 {
  39         int ret;
  40         unsigned long ups_restart;
  41         ret = sscanf(buf, "%lu", &ups_restart);
  42
  43         if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
  44                 rtas_poweron_auto = ups_restart;
  45                 return n;
  46         }
  47         return -EINVAL;
  48 }
  49
  50 static struct subsys_attribute auto_poweron_attr = {
  51         .attr   = {
  52                 .name = __stringify(auto_poweron),
  53                 .mode = 0644,
  54         },
  55         .show   = auto_poweron_show,
  56         .store  = auto_poweron_store,
  57 };
  58
  59 #ifndef CONFIG_PM
  60 decl_subsys(power,NULL,NULL);
  61
  62 static struct attribute *g[] = {
  63         &auto_poweron_attr.attr,
  64         NULL,
  65 };
  66
  67 static struct attribute_group attr_group = {
  68         .attrs = g,
  69 };
  70
  71 static int __init pm_init(void)
  72 {
  73         int error = subsystem_register(&power_subsys);
  74         if (!error)
  75                 error = sysfs_create_group(&power_subsys.kobj, &attr_group);
  76         return error;
  77 }
  78 core_initcall(pm_init);
  79 #else
  80 extern struct kset power_subsys;
  81
  82 static int __init apo_pm_init(void)
  83 {
  84         return (subsys_create_file(&power_subsys, &auto_poweron_attr));
  85 }
  86 __initcall(apo_pm_init);
  87 #endif