Commit 6a1d96dc authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

[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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 0259162e

drivers/s390/net/smsgiucv.c

+60 −3
Original line number Diff line number Diff line 
/*

 * 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: