diff options
| -rw-r--r-- | arch/s390/include/asm/ccwgroup.h | 10 | ||||
| -rw-r--r-- | drivers/s390/cio/ccwgroup.c | 78 |
2 files changed, 83 insertions, 5 deletions
diff --git a/arch/s390/include/asm/ccwgroup.h b/arch/s390/include/asm/ccwgroup.h index a27f68985a79..c79c1e787b86 100644 --- a/arch/s390/include/asm/ccwgroup.h +++ b/arch/s390/include/asm/ccwgroup.h @@ -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; }; diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c index 22ce765d537e..a5a62f1f7747 100644 --- a/drivers/s390/cio/ccwgroup.c +++ b/drivers/s390/cio/ccwgroup.c @@ -1,11 +1,10 @@ /* - * drivers/s390/cio/ccwgroup.c * bus driver for ccwgroup * - * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, - * IBM Corporation - * Author(s): Arnd Bergmann (arndb@de.ibm.com) - * Cornelia Huck (cornelia.huck@de.ibm.com) + * Copyright IBM Corp. 2002, 2009 + * + * Author(s): Arnd Bergmann (arndb@de.ibm.com) + * Cornelia Huck (cornelia.huck@de.ibm.com) */ #include <linux/module.h> #include <linux/errno.h> @@ -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, }; |