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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-16 10:30:46 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-16 10:31:20 +0200
commit6a1d96dced593bc17d7a17fdb93c99b275e71eba (patch)
tree69ac1bb8a52d8b537281118b24617076ff08ac3f
parent0259162ecd083f1ce0f6022e669f393330b06f4d (diff)
downloadlinux-6a1d96dced593bc17d7a17fdb93c99b275e71eba.tar.bz2
[S390] pm: smsgiucv power management callbacks.
Create dummy iucv-device to get control when the system is suspended and resumed. Server the smsg iucv path on suspend, reestablish the path on resume. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--drivers/s390/net/smsgiucv.c63
1 files changed, 60 insertions, 3 deletions
diff --git a/drivers/s390/net/smsgiucv.c b/drivers/s390/net/smsgiucv.c
index 164e090c2625..e76a320d373b 100644
--- a/drivers/s390/net/smsgiucv.c
+++ b/drivers/s390/net/smsgiucv.c
@@ -1,7 +1,8 @@
/*
* IUCV special message driver
*
- * Copyright 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Copyright IBM Corp. 2003, 2009
+ *
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* This program is free software; you can redistribute it and/or modify
@@ -40,6 +41,8 @@ MODULE_AUTHOR
MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver");
static struct iucv_path *smsg_path;
+/* dummy device used as trigger for PM functions */
+static struct device *smsg_dev;
static DEFINE_SPINLOCK(smsg_list_lock);
static LIST_HEAD(smsg_list);
@@ -132,14 +135,51 @@ void smsg_unregister_callback(char *prefix,
kfree(cb);
}
+static int smsg_pm_freeze(struct device *dev)
+{
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "smsg_pm_freeze\n");
+#endif
+ if (smsg_path)
+ iucv_path_sever(smsg_path, NULL);
+ return 0;
+}
+
+static int smsg_pm_restore_thaw(struct device *dev)
+{
+ int rc;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "smsg_pm_restore_thaw\n");
+#endif
+ if (smsg_path) {
+ memset(smsg_path, 0, sizeof(*smsg_path));
+ smsg_path->msglim = 255;
+ smsg_path->flags = 0;
+ rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ",
+ NULL, NULL, NULL);
+ printk(KERN_ERR "iucv_path_connect returned with rc %i\n", rc);
+ }
+ return 0;
+}
+
+static struct dev_pm_ops smsg_pm_ops = {
+ .freeze = smsg_pm_freeze,
+ .thaw = smsg_pm_restore_thaw,
+ .restore = smsg_pm_restore_thaw,
+};
+
static struct device_driver smsg_driver = {
+ .owner = THIS_MODULE,
.name = "SMSGIUCV",
.bus = &iucv_bus,
+ .pm = &smsg_pm_ops,
};
static void __exit smsg_exit(void)
{
cpcmd("SET SMSG IUCV", NULL, 0, NULL);
+ device_unregister(smsg_dev);
iucv_unregister(&smsg_handler, 1);
driver_unregister(&smsg_driver);
}
@@ -166,12 +206,29 @@ static int __init smsg_init(void)
rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ",
NULL, NULL, NULL);
if (rc)
- goto out_free;
+ goto out_free_path;
+ smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
+ if (!smsg_dev) {
+ rc = -ENOMEM;
+ goto out_free_path;
+ }
+ dev_set_name(smsg_dev, "smsg_iucv");
+ smsg_dev->bus = &iucv_bus;
+ smsg_dev->parent = iucv_root;
+ smsg_dev->release = (void (*)(struct device *))kfree;
+ smsg_dev->driver = &smsg_driver;
+ rc = device_register(smsg_dev);
+ if (rc)
+ goto out_free_dev;
+
cpcmd("SET SMSG IUCV", NULL, 0, NULL);
return 0;
-out_free:
+out_free_dev:
+ kfree(smsg_dev);
+out_free_path:
iucv_path_free(smsg_path);
+ smsg_path = NULL;
out_register:
iucv_unregister(&smsg_handler, 1);
out_driver: