From 6a1d96dced593bc17d7a17fdb93c99b275e71eba Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Tue, 16 Jun 2009 10:30:46 +0200 Subject: [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 --- drivers/s390/net/smsgiucv.c | 63 ++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 60 insertions(+), 3 deletions(-) (limited to 'drivers/s390') 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: -- cgit v1.2.3