[S390] pm: ccwgroup bus power management callbacks
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -38,6 +38,11 @@ struct ccwgroup_device {
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* @set_online: function called when device is set online
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* @set_offline: function called when device is set offline
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* @shutdown: function called when device is shut down
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* @prepare: prepare for pm state transition
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* @complete: undo work done in @prepare
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* @freeze: callback for freezing during hibernation snapshotting
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* @thaw: undo work done in @freeze
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* @restore: callback for restoring after hibernation
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* @driver: embedded driver structure
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*/
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struct ccwgroup_driver {
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@ -51,6 +56,11 @@ struct ccwgroup_driver {
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int (*set_online) (struct ccwgroup_device *);
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int (*set_offline) (struct ccwgroup_device *);
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void (*shutdown)(struct ccwgroup_device *);
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int (*prepare) (struct ccwgroup_device *);
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void (*complete) (struct ccwgroup_device *);
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int (*freeze)(struct ccwgroup_device *);
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int (*thaw) (struct ccwgroup_device *);
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int (*restore)(struct ccwgroup_device *);
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struct device_driver driver;
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};
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@ -1,9 +1,8 @@
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/*
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* drivers/s390/cio/ccwgroup.c
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* bus driver for ccwgroup
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*
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* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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* Copyright IBM Corp. 2002, 2009
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*
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* Author(s): Arnd Bergmann (arndb@de.ibm.com)
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* Cornelia Huck (cornelia.huck@de.ibm.com)
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*/
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@ -501,6 +500,74 @@ static void ccwgroup_shutdown(struct device *dev)
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gdrv->shutdown(gdev);
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}
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static int ccwgroup_pm_prepare(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
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/* Fail while device is being set online/offline. */
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if (atomic_read(&gdev->onoff))
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return -EAGAIN;
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if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
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return 0;
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return gdrv->prepare ? gdrv->prepare(gdev) : 0;
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}
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static void ccwgroup_pm_complete(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
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if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
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return;
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if (gdrv->complete)
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gdrv->complete(gdev);
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}
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static int ccwgroup_pm_freeze(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
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if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
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return 0;
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return gdrv->freeze ? gdrv->freeze(gdev) : 0;
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}
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static int ccwgroup_pm_thaw(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
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if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
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return 0;
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return gdrv->thaw ? gdrv->thaw(gdev) : 0;
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}
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static int ccwgroup_pm_restore(struct device *dev)
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{
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struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
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struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
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if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
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return 0;
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return gdrv->restore ? gdrv->restore(gdev) : 0;
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}
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static struct dev_pm_ops ccwgroup_pm_ops = {
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.prepare = ccwgroup_pm_prepare,
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.complete = ccwgroup_pm_complete,
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.freeze = ccwgroup_pm_freeze,
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.thaw = ccwgroup_pm_thaw,
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.restore = ccwgroup_pm_restore,
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};
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static struct bus_type ccwgroup_bus_type = {
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.name = "ccwgroup",
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.match = ccwgroup_bus_match,
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@ -508,6 +575,7 @@ static struct bus_type ccwgroup_bus_type = {
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.probe = ccwgroup_probe,
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.remove = ccwgroup_remove,
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.shutdown = ccwgroup_shutdown,
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.pm = &ccwgroup_pm_ops,
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};
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