4 files changed, 64 insertions, 27 deletions

diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 85b2482cc736..c0f9bb78727d 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -143,6 +143,7 @@ header-y += snmp.h
 header-y += sockios.h
 header-y += som.h
 header-y += sound.h
+header-y += suspend_ioctls.h
 header-y += taskstats.h
 header-y += telephony.h
 header-y += termios.h
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index 5dfbc684ce7d..f4df40038f0c 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -228,6 +228,8 @@ static inline int notifier_to_errno(int ret)
 #define PM_POST_HIBERNATION     0x0002 /* Hibernation finished */
 #define PM_SUSPEND_PREPARE      0x0003 /* Going to suspend the system */
 #define PM_POST_SUSPEND         0x0004 /* Suspend finished */
+#define PM_RESTORE_PREPARE      0x0005 /* Going to restore a saved image */
+#define PM_POST_RESTORE         0x0006 /* Restore failed */
 
 /* Console keyboard events.
  * Note: KBD_KEYCODE is always sent before KBD_UNBOUND_KEYCODE, KBD_UNICODE and
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 40280df2a3db..646ce2d068d4 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -38,18 +38,16 @@ typedef int __bitwise suspend_state_t;
  *      There is the %suspend_valid_only_mem function available that can be
  *      assigned to this if the platform only supports mem sleep.
  *
- * @set_target: Tell the platform which system sleep state is going to be
- *      entered.
- *      @set_target() is executed right prior to suspending devices.  The
- *      information conveyed to the platform code by @set_target() should be
- *      disregarded by the platform as soon as @finish() is executed and if
- *      @prepare() fails.  If @set_target() fails (ie. returns nonzero),
+ * @begin: Initialise a transition to given system sleep state.
+ *      @begin() is executed right prior to suspending devices.  The information
+ *      conveyed to the platform code by @begin() should be disregarded by it as
+ *      soon as @end() is executed.  If @begin() fails (ie. returns nonzero),
  *      @prepare(), @enter() and @finish() will not be called by the PM core.
  *      This callback is optional.  However, if it is implemented, the argument
- *      passed to @enter() is meaningless and should be ignored.
+ *      passed to @enter() is redundant and should be ignored.
  *
  * @prepare: Prepare the platform for entering the system sleep state indicated
- *      by @set_target().
+ *      by @begin().
  *      @prepare() is called right after devices have been suspended (ie. the
  *      appropriate .suspend() method has been executed for each device) and
  *      before the nonboot CPUs are disabled (it is executed with IRQs enabled).
@@ -57,8 +55,8 @@ typedef int __bitwise suspend_state_t;
  *      error code otherwise, in which case the system cannot enter the desired
  *      sleep state (@enter() and @finish() will not be called in that case).
  *
- * @enter: Enter the system sleep state indicated by @set_target() or
- *      represented by the argument if @set_target() is not implemented.
+ * @enter: Enter the system sleep state indicated by @begin() or represented by
+ *      the argument if @begin() is not implemented.
  *      This callback is mandatory.  It returns 0 on success or a negative
  *      error code otherwise, in which case the system cannot enter the desired
  *      sleep state.
@@ -69,13 +67,22 @@ typedef int __bitwise suspend_state_t;
  *      This callback is optional, but should be implemented by the platforms
  *      that implement @prepare().  If implemented, it is always called after
  *      @enter() (even if @enter() fails).
+ *
+ * @end: Called by the PM core right after resuming devices, to indicate to
+ *      the platform that the system has returned to the working state or
+ *      the transition to the sleep state has been aborted.
+ *      This callback is optional, but should be implemented by the platforms
+ *      that implement @begin(), but platforms implementing @begin() should
+ *      also provide a @end() which cleans up transitions aborted before
+ *      @enter().
  */
 struct platform_suspend_ops {
         int (*valid)(suspend_state_t state);
-        int (*set_target)(suspend_state_t state);
+        int (*begin)(suspend_state_t state);
         int (*prepare)(void);
         int (*enter)(suspend_state_t state);
         void (*finish)(void);
+        void (*end)(void);
 };
 
 #ifdef CONFIG_SUSPEND
@@ -129,14 +136,17 @@ extern void mark_free_pages(struct zone *zone);
 /**
  * struct platform_hibernation_ops - hibernation platform support
  *
- * The methods in this structure allow a platform to override the default
- * mechanism of shutting down the machine during a hibernation transition.
+ * The methods in this structure allow a platform to carry out special
+ * operations required by it during a hibernation transition.
  *
- * All three methods must be assigned.
+ * All the methods below must be implemented.
  *
- * @start: Tell the platform driver that we're starting hibernation.
+ * @begin: Tell the platform driver that we're starting hibernation.
  *      Called right after shrinking memory and before freezing devices.
  *
+ * @end: Called by the PM core right after resuming devices, to indicate to
+ *      the platform that the system has returned to the working state.
+ *
  * @pre_snapshot: Prepare the platform for creating the hibernation image.
  *      Called right after devices have been frozen and before the nonboot
  *      CPUs are disabled (runs with IRQs on).
@@ -171,7 +181,8 @@ extern void mark_free_pages(struct zone *zone);
  *      thawing devices (runs with IRQs on).
  */
 struct platform_hibernation_ops {
-        int (*start)(void);
+        int (*begin)(void);
+        void (*end)(void);
         int (*pre_snapshot)(void);
         void (*finish)(void);
         int (*prepare)(void);
@@ -213,17 +224,8 @@ void save_processor_state(void);
 void restore_processor_state(void);
 
 /* kernel/power/main.c */
-extern struct blocking_notifier_head pm_chain_head;
-
-static inline int register_pm_notifier(struct notifier_block *nb)
-{
-        return blocking_notifier_chain_register(&pm_chain_head, nb);
-}
-
-static inline int unregister_pm_notifier(struct notifier_block *nb)
-{
-        return blocking_notifier_chain_unregister(&pm_chain_head, nb);
-}
+extern int register_pm_notifier(struct notifier_block *nb);
+extern int unregister_pm_notifier(struct notifier_block *nb);
 
 #define pm_notifier(fn, pri) {                          \
         static struct notifier_block fn##_nb =                  \
diff --git a/include/linux/suspend_ioctls.h b/include/linux/suspend_ioctls.h
new file mode 100644
index 000000000000..2c6faec96bde
--- /dev/null
+++ b/include/linux/suspend_ioctls.h
@@ -0,0 +1,32 @@
+#ifndef _LINUX_SUSPEND_IOCTLS_H
+#define _LINUX_SUSPEND_IOCTLS_H
+
+/*
+ * This structure is used to pass the values needed for the identification
+ * of the resume swap area from a user space to the kernel via the
+ * SNAPSHOT_SET_SWAP_AREA ioctl
+ */
+struct resume_swap_area {
+        loff_t offset;
+        u_int32_t dev;
+} __attribute__((packed));
+
+#define SNAPSHOT_IOC_MAGIC      '3'
+#define SNAPSHOT_FREEZE                 _IO(SNAPSHOT_IOC_MAGIC, 1)
+#define SNAPSHOT_UNFREEZE               _IO(SNAPSHOT_IOC_MAGIC, 2)
+#define SNAPSHOT_ATOMIC_RESTORE         _IO(SNAPSHOT_IOC_MAGIC, 4)
+#define SNAPSHOT_FREE                   _IO(SNAPSHOT_IOC_MAGIC, 5)
+#define SNAPSHOT_FREE_SWAP_PAGES        _IO(SNAPSHOT_IOC_MAGIC, 9)
+#define SNAPSHOT_S2RAM                  _IO(SNAPSHOT_IOC_MAGIC, 11)
+#define SNAPSHOT_SET_SWAP_AREA          _IOW(SNAPSHOT_IOC_MAGIC, 13, \
+                                                        struct resume_swap_area)
+#define SNAPSHOT_GET_IMAGE_SIZE         _IOR(SNAPSHOT_IOC_MAGIC, 14, loff_t)
+#define SNAPSHOT_PLATFORM_SUPPORT       _IO(SNAPSHOT_IOC_MAGIC, 15)
+#define SNAPSHOT_POWER_OFF              _IO(SNAPSHOT_IOC_MAGIC, 16)
+#define SNAPSHOT_CREATE_IMAGE           _IOW(SNAPSHOT_IOC_MAGIC, 17, int)
+#define SNAPSHOT_PREF_IMAGE_SIZE        _IO(SNAPSHOT_IOC_MAGIC, 18)
+#define SNAPSHOT_AVAIL_SWAP_SIZE        _IOR(SNAPSHOT_IOC_MAGIC, 19, loff_t)
+#define SNAPSHOT_ALLOC_SWAP_PAGE        _IOR(SNAPSHOT_IOC_MAGIC, 20, loff_t)
+#define SNAPSHOT_IOC_MAXNR      20
+
+#endif /* _LINUX_SUSPEND_IOCTLS_H */