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Commit 7e597a21 authored by Sebastian Ott's avatar Sebastian Ott Committed by Martin Schwidefsky
Browse files

[S390] pm: ccwgroup bus power management callbacks 



Signed-off-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 823d494a

arch/s390/include/asm/ccwgroup.h

+10 −0
Original line number Diff line number Diff line
@@ -38,6 +38,11 @@ struct ccwgroup_device { 
 * @set_online: function called when device is set online

 * @set_offline: function called when device is set offline

 * @shutdown: function called when device is shut down

 * @prepare: prepare for pm state transition

 * @complete: undo work done in @prepare

 * @freeze: callback for freezing during hibernation snapshotting

 * @thaw: undo work done in @freeze

 * @restore: callback for restoring after hibernation

 * @driver: embedded driver structure

 */

struct ccwgroup_driver {
@@ -51,6 +56,11 @@ struct ccwgroup_driver { 
	int (*set_online) (struct ccwgroup_device *);

	int (*set_offline) (struct ccwgroup_device *);

	void (*shutdown)(struct ccwgroup_device *);

	int (*prepare) (struct ccwgroup_device *);

	void (*complete) (struct ccwgroup_device *);

	int (*freeze)(struct ccwgroup_device *);

	int (*thaw) (struct ccwgroup_device *);

	int (*restore)(struct ccwgroup_device *);



	struct device_driver driver;

};

drivers/s390/cio/ccwgroup.c

+73 −5
Original line number Diff line number Diff line 
/*

 *  drivers/s390/cio/ccwgroup.c

 *  bus driver for ccwgroup

 *

 *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,

 *                       IBM Corporation

 *  Copyright IBM Corp. 2002, 2009

 *

 *  Author(s): Arnd Bergmann (arndb@de.ibm.com)

 *	       Cornelia Huck (cornelia.huck@de.ibm.com)

 */
@@ -501,6 +500,74 @@ static void ccwgroup_shutdown(struct device *dev) 
		gdrv->shutdown(gdev);

}



static int ccwgroup_pm_prepare(struct device *dev)

{

	struct ccwgroup_device *gdev = to_ccwgroupdev(dev);

	struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);



	/* Fail while device is being set online/offline. */

	if (atomic_read(&gdev->onoff))

		return -EAGAIN;



	if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)

		return 0;



	return gdrv->prepare ? gdrv->prepare(gdev) : 0;

}



static void ccwgroup_pm_complete(struct device *dev)

{

	struct ccwgroup_device *gdev = to_ccwgroupdev(dev);

	struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);



	if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)

		return;



	if (gdrv->complete)

		gdrv->complete(gdev);

}



static int ccwgroup_pm_freeze(struct device *dev)

{

	struct ccwgroup_device *gdev = to_ccwgroupdev(dev);

	struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);



	if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)

		return 0;



	return gdrv->freeze ? gdrv->freeze(gdev) : 0;

}



static int ccwgroup_pm_thaw(struct device *dev)

{

	struct ccwgroup_device *gdev = to_ccwgroupdev(dev);

	struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);



	if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)

		return 0;



	return gdrv->thaw ? gdrv->thaw(gdev) : 0;

}



static int ccwgroup_pm_restore(struct device *dev)

{

	struct ccwgroup_device *gdev = to_ccwgroupdev(dev);

	struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);



	if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)

		return 0;



	return gdrv->restore ? gdrv->restore(gdev) : 0;

}



static struct dev_pm_ops ccwgroup_pm_ops = {

	.prepare = ccwgroup_pm_prepare,

	.complete = ccwgroup_pm_complete,

	.freeze = ccwgroup_pm_freeze,

	.thaw = ccwgroup_pm_thaw,

	.restore = ccwgroup_pm_restore,

};



static struct bus_type ccwgroup_bus_type = {

	.name   = "ccwgroup",

	.match  = ccwgroup_bus_match,
@@ -508,6 +575,7 @@ static struct bus_type ccwgroup_bus_type = { 
	.probe  = ccwgroup_probe,

	.remove = ccwgroup_remove,

	.shutdown = ccwgroup_shutdown,

	.pm = &ccwgroup_pm_ops,

};