diff options
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/ccwgroup.c | 78 |
1 files changed, 73 insertions, 5 deletions
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c index 22ce765d537..a5a62f1f774 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, }; |