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Subject[PATCH 2/5] PM: Introduce generic prepare and complete callbacks for subsystems
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

Introduce generic ->prepare() and ->complete() power management
callbacks that can be used by subsystems and power domains, export
them and make the generic_subsys_pm_ops object point to them.
Additionally, provide NULL definitions of all the generic system
sleep callbacks for CONFIG_PM_SLEEP unset.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
drivers/base/power/generic_ops.c | 39 +++++++++++++++++++++++++++++++++++++++
include/linux/pm.h | 26 +++++++++++++++++++-------
2 files changed, 58 insertions(+), 7 deletions(-)

Index: linux-2.6/drivers/base/power/generic_ops.c
===================================================================
--- linux-2.6.orig/drivers/base/power/generic_ops.c
+++ linux-2.6/drivers/base/power/generic_ops.c
@@ -74,6 +74,23 @@ EXPORT_SYMBOL_GPL(pm_generic_runtime_res

#ifdef CONFIG_PM_SLEEP
/**
+ * pm_generic_prepare - Generic routine preparing a device for power transition.
+ * @dev: Device to prepare.
+ *
+ * Prepare a device for a system-wide power transition.
+ */
+int pm_generic_prepare(struct device *dev)
+{
+ struct device_driver *drv = dev->driver;
+ int ret = 0;
+
+ if (drv && drv->pm && drv->pm->prepare)
+ ret = drv->pm->prepare(dev);
+
+ return ret;
+}
+
+/**
* __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback.
* @dev: Device to handle.
* @event: PM transition of the system under way.
@@ -213,16 +230,38 @@ int pm_generic_restore(struct device *de
return __pm_generic_resume(dev, PM_EVENT_RESTORE);
}
EXPORT_SYMBOL_GPL(pm_generic_restore);
+
+/**
+ * pm_generic_complete - Generic routine competing a device power transition.
+ * @dev: Device to handle.
+ *
+ * Complete a device power transition during a system-wide power transition.
+ */
+void pm_generic_complete(struct device *dev)
+{
+ struct device_driver *drv = dev->driver;
+
+ if (drv && drv->pm && drv->pm->complete)
+ drv->pm->complete(dev);
+
+ /*
+ * Let runtime PM try to suspend devices that haven't been in use before
+ * going into the system-wide sleep state we're resuming from.
+ */
+ pm_runtime_idle(dev);
+}
#endif /* CONFIG_PM_SLEEP */

struct dev_pm_ops generic_subsys_pm_ops = {
#ifdef CONFIG_PM_SLEEP
+ .prepare = pm_generic_prepare,
.suspend = pm_generic_suspend,
.resume = pm_generic_resume,
.freeze = pm_generic_freeze,
.thaw = pm_generic_thaw,
.poweroff = pm_generic_poweroff,
.restore = pm_generic_restore,
+ .complete = pm_generic_complete,
#endif
#ifdef CONFIG_PM_RUNTIME
.runtime_suspend = pm_generic_runtime_suspend,
Index: linux-2.6/include/linux/pm.h
===================================================================
--- linux-2.6.orig/include/linux/pm.h
+++ linux-2.6/include/linux/pm.h
@@ -547,6 +547,16 @@ extern void __suspend_report_result(cons
} while (0)

extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
+
+extern int pm_generic_prepare(struct device *dev);
+extern int pm_generic_suspend(struct device *dev);
+extern int pm_generic_resume(struct device *dev);
+extern int pm_generic_freeze(struct device *dev);
+extern int pm_generic_thaw(struct device *dev);
+extern int pm_generic_restore(struct device *dev);
+extern int pm_generic_poweroff(struct device *dev);
+extern void pm_generic_complete(struct device *dev);
+
#else /* !CONFIG_PM_SLEEP */

#define device_pm_lock() do {} while (0)
@@ -563,6 +573,15 @@ static inline int device_pm_wait_for_dev
{
return 0;
}
+
+#define pm_generic_prepare NULL
+#define pm_generic_suspend NULL
+#define pm_generic_resume NULL
+#define pm_generic_freeze NULL
+#define pm_generic_thaw NULL
+#define pm_generic_restore NULL
+#define pm_generic_poweroff NULL
+#define pm_generic_complete NULL
#endif /* !CONFIG_PM_SLEEP */

/* How to reorder dpm_list after device_move() */
@@ -573,11 +592,4 @@ enum dpm_order {
DPM_ORDER_DEV_LAST,
};

-extern int pm_generic_suspend(struct device *dev);
-extern int pm_generic_resume(struct device *dev);
-extern int pm_generic_freeze(struct device *dev);
-extern int pm_generic_thaw(struct device *dev);
-extern int pm_generic_restore(struct device *dev);
-extern int pm_generic_poweroff(struct device *dev);
-
#endif /* _LINUX_PM_H */


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