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[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>
This commit is contained in:
Martin Schwidefsky 2009-06-16 10:30:46 +02:00
parent 0259162ecd
commit 6a1d96dced
1 changed files with 60 additions and 3 deletions
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63
drivers/s390/net/smsgiucv.c
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@ -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: