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path: root/drivers/s390/cio/ccwgroup.c
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Diffstat (limited to 'drivers/s390/cio/ccwgroup.c')
-rw-r--r--drivers/s390/cio/ccwgroup.c78
1 files changed, 73 insertions, 5 deletions
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,
};