[PATCH] introduce .valid callback for pm_ops

[karo-tx-linux.git] / include / linux / pm.h

diff --git a/include/linux/pm.h b/include/linux/pm.h
index da88851266b8965c1bf465de888fdc12e1f0cefa..1514098d156d897ba02956517bc544f7626f5f87 100644 (file)
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -103,7 +103,8 @@ extern int pm_active;
 /*
  * Register a device with power management
  */
-struct pm_dev __deprecated *pm_register(pm_dev_t type, unsigned long id, pm_callback callback);
+struct pm_dev __deprecated *
+pm_register(pm_dev_t type, unsigned long id, pm_callback callback);
 
 /*
  * Unregister a device with power management
@@ -169,6 +170,7 @@ typedef int __bitwise suspend_disk_method_t;
 
 struct pm_ops {
        suspend_disk_method_t pm_disk_mode;
+       int (*valid)(suspend_state_t state);
        int (*prepare)(suspend_state_t state);
        int (*enter)(suspend_state_t state);
        int (*finish)(suspend_state_t state);
@@ -185,36 +187,44 @@ extern int pm_suspend(suspend_state_t state);
 
 struct device;
 
-typedef u32 __bitwise pm_message_t;
+typedef struct pm_message {
+       int event;
+} pm_message_t;
 
 /*
  * There are 4 important states driver can be in:
  * ON     -- driver is working
- * FREEZE -- stop operations and apply whatever policy is applicable to a suspended driver
- *           of that class, freeze queues for block like IDE does, drop packets for
- *           ethernet, etc... stop DMA engine too etc... so a consistent image can be
- *           saved; but do not power any hardware down.
- * SUSPEND - like FREEZE, but hardware is doing as much powersaving as possible. Roughly
- *           pci D3.
+ * FREEZE -- stop operations and apply whatever policy is applicable to a
+ *           suspended driver of that class, freeze queues for block like IDE
+ *           does, drop packets for ethernet, etc... stop DMA engine too etc...
+ *           so a consistent image can be saved; but do not power any hardware
+ *           down.
+ * SUSPEND - like FREEZE, but hardware is doing as much powersaving as
+ *           possible. Roughly pci D3.
  *
- * Unfortunately, current drivers only recognize numeric values 0 (ON) and 3 (SUSPEND).
- * We'll need to fix the drivers. So yes, putting 3 to all diferent defines is intentional,
- * and will go away as soon as drivers are fixed. Also note that typedef is neccessary,
- * we'll probably want to switch to
+ * Unfortunately, current drivers only recognize numeric values 0 (ON) and 3
+ * (SUSPEND).  We'll need to fix the drivers. So yes, putting 3 to all different
+ * defines is intentional, and will go away as soon as drivers are fixed.  Also
+ * note that typedef is neccessary, we'll probably want to switch to
  *   typedef struct pm_message_t { int event; int flags; } pm_message_t
  * or something similar soon.
  */
 
-#define PMSG_FREEZE    ((__force pm_message_t) 3)
-#define PMSG_SUSPEND   ((__force pm_message_t) 3)
-#define PMSG_ON                ((__force pm_message_t) 0)
+#define PM_EVENT_ON 0
+#define PM_EVENT_FREEZE 1
+#define PM_EVENT_SUSPEND 2
+
+#define PMSG_FREEZE    ((struct pm_message){ .event = PM_EVENT_FREEZE, })
+#define PMSG_SUSPEND   ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
+#define PMSG_ON                ((struct pm_message){ .event = PM_EVENT_ON, })
 
 struct dev_pm_info {
        pm_message_t            power_state;
+       unsigned                can_wakeup:1;
 #ifdef CONFIG_PM
+       unsigned                should_wakeup:1;
        pm_message_t            prev_state;
        void                    * saved_state;
-       atomic_t                pm_users;
        struct device           * pm_parent;
        struct list_head        entry;
 #endif
@@ -222,11 +232,53 @@ struct dev_pm_info {
 
 extern void device_pm_set_parent(struct device * dev, struct device * parent);
 
-extern int device_suspend(pm_message_t state);
 extern int device_power_down(pm_message_t state);
 extern void device_power_up(void);
 extern void device_resume(void);
 
+#ifdef CONFIG_PM
+extern int device_suspend(pm_message_t state);
+
+#define device_set_wakeup_enable(dev,val) \
+       ((dev)->power.should_wakeup = !!(val))
+#define device_may_wakeup(dev) \
+       (device_can_wakeup(dev) && (dev)->power.should_wakeup)
+
+extern int dpm_runtime_suspend(struct device *, pm_message_t);
+extern void dpm_runtime_resume(struct device *);
+
+#else /* !CONFIG_PM */
+
+static inline int device_suspend(pm_message_t state)
+{
+       return 0;
+}
+
+#define device_set_wakeup_enable(dev,val)      do{}while(0)
+#define device_may_wakeup(dev)                 (0)
+
+static inline int dpm_runtime_suspend(struct device * dev, pm_message_t state)
+{
+       return 0;
+}
+
+static inline void dpm_runtime_resume(struct device * dev)
+{
+
+}
+
+#endif
+
+/* changes to device_may_wakeup take effect on the next pm state change.
+ * by default, devices should wakeup if they can.
+ */
+#define device_can_wakeup(dev) \
+       ((dev)->power.can_wakeup)
+#define device_init_wakeup(dev,val) \
+       do { \
+               device_can_wakeup(dev) = !!(val); \
+               device_set_wakeup_enable(dev,val); \
+       } while(0)
 
 #endif /* __KERNEL__ */