include/linux/pm_wakeup.h

   1 /*
   2  *  pm_wakeup.h - Power management wakeup interface
   3  *
   4  *  Copyright (C) 2008 Alan Stern
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifndef _LINUX_PM_WAKEUP_H
  22 #define _LINUX_PM_WAKEUP_H
  23
  24 #ifndef _DEVICE_H_
  25 # error "please don't include this file directly"
  26 #endif
  27
  28 #ifdef CONFIG_PM
  29
  30 /* changes to device_may_wakeup take effect on the next pm state change.
  31  * by default, devices should wakeup if they can.
  32  */
  33 static inline void device_init_wakeup(struct device *dev, int val)
  34 {
  35         dev->power.can_wakeup = dev->power.should_wakeup = !!val;
  36 }
  37
  38 static inline int device_can_wakeup(struct device *dev)
  39 {
  40         return dev->power.can_wakeup;
  41 }
  42
  43 static inline void device_set_wakeup_enable(struct device *dev, int val)
  44 {
  45         dev->power.should_wakeup = !!val;
  46 }
  47
  48 static inline int device_may_wakeup(struct device *dev)
  49 {
  50         return dev->power.can_wakeup & dev->power.should_wakeup;
  51 }
  52
  53 /*
  54  * Platform hook to activate device wakeup capability, if that's not already
  55  * handled by enable_irq_wake() etc.
  56  * Returns zero on success, else negative errno
  57  */
  58 extern int (*platform_enable_wakeup)(struct device *dev, int is_on);
  59
  60 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
  61 {
  62         if (platform_enable_wakeup)
  63                 return (*platform_enable_wakeup)(dev, is_on);
  64         return 0;
  65 }
  66
  67 #else /* !CONFIG_PM */
  68
  69 /* For some reason the next two routines work even without CONFIG_PM */
  70 static inline void device_init_wakeup(struct device *dev, int val)
  71 {
  72         dev->power.can_wakeup = !!val;
  73 }
  74
  75 static inline int device_can_wakeup(struct device *dev)
  76 {
  77         return dev->power.can_wakeup;
  78 }
  79
  80 #define device_set_wakeup_enable(dev, val)      do {} while (0)
  81 #define device_may_wakeup(dev)                  0
  82
  83 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
  84 {
  85         return 0;
  86 }
  87
  88 #endif /* !CONFIG_PM */
  89
  90 #endif /* _LINUX_PM_WAKEUP_H */