/*
* IUCV special message driver
*
* Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <asm/cpcmd.h>
#include <asm/ebcdic.h>
#include "iucv.h"
struct smsg_callback {
struct list_head list;
char *prefix;
int len;
void (*callback)(char *str);
};
MODULE_AUTHOR
("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)");
MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver");
static iucv_handle_t smsg_handle;
static unsigned short smsg_pathid;
static DEFINE_SPINLOCK(smsg_list_lock);
static struct list_head smsg_list = LIST_HEAD_INIT(smsg_list);
static void
smsg_connection_complete(iucv_ConnectionComplete *eib, void *pgm_data)
{
}
static void
smsg_message_pending(iucv_MessagePending *eib, void *pgm_data)
{
struct smsg_callback *cb;
unsigned char *msg;
unsigned short len;
int rc;
len = eib->ln1msg2.ipbfln1f;
msg = kmalloc(len + 1, GFP_ATOMIC|GFP_DMA);
if (!msg) {
iucv_reject(eib->ippathid, eib->ipmsgid, eib->iptrgcls);
return;
}
rc = iucv_receive(eib->ippathid, eib->ipmsgid, eib->iptrgcls,
msg, len, 0, 0, 0);
if (rc == 0) {
msg[len] = 0;
EBCASC(msg, len);
spin_lock(&smsg_list_lock);
list_for_each_entry(cb, &smsg_list, list)
if (strncmp(msg + 8, cb->prefix, cb->len) == 0) {
cb->callback(msg + 8);
break;
}
spin_unlock(&smsg_list_lock);
}
kfree(msg);
}
static iucv_interrupt_ops_t smsg_ops = {
.ConnectionComplete = smsg_connection_complete,
.MessagePending = smsg_message_pending,
};
static struct device_driver smsg_driver = {
.name = "SMSGIUCV",
.bus = &iucv_bus,
};
int
smsg_register_callback(char *prefix, void (*callback)(char *str))
{
struct smsg_callback *cb;
cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL);
if (!cb)
return -ENOMEM;
cb->prefix = prefix;
cb->len = strlen(prefix);
cb->callback = callback;
spin_lock(&smsg_list_lock);
list_add_tail(&cb->list, &smsg_list);
spin_unlock(&smsg_list_lock);
return 0;
}
void
smsg_unregister_callback(char *prefix, void (*callback)(char *str))
{
struct smsg_callback *cb, *tmp;
spin_lock(&smsg_list_lock);
cb = 0;
list_for_each_entry(tmp, &smsg_list, list)
if (tmp->callback == callback &&
strcmp(tmp->prefix, prefix) == 0) {
cb = tmp;
list_del(&cb->list);
break;
}
spin_unlock(&smsg_list_lock);
kfree(cb);
}
static void __exit
smsg_exit(void)
{
if (smsg_handle > 0) {
cpcmd("SET SMSG OFF", 0, 0);
iucv_sever(smsg_pathid, 0);
iucv_unregister_program(smsg_handle);
driver_unregister(&smsg_driver);
}
return;
}
static int __init
smsg_init(void)
{
static unsigned char pgmmask[24] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
int rc;
rc = driver_register(&smsg_driver);
if (rc != 0) {
printk(KERN_ERR "SMSGIUCV: failed to register driver.\n");
return rc;
}
smsg_handle = iucv_register_program("SMSGIUCV ", "*MSG ",
pgmmask, &smsg_ops, 0);
if (!smsg_handle) {
printk(KERN_ERR "SMSGIUCV: failed to register to iucv");
driver_unregister(&smsg_driver);
return -EIO; /* better errno ? */
}
rc = iucv_connect (&smsg_pathid, 1, 0, "*MSG ", 0, 0, 0, 0,
smsg_handle, 0);
if (rc) {
printk(KERN_ERR "SMSGIUCV: failed to connect to *MSG");
iucv_unregister_program(smsg_handle);
driver_unregister(&smsg_driver);
smsg_handle = 0;
return -EIO;
}
cpcmd("SET SMSG IUCV", 0, 0);
return 0;
}
module_init(smsg_init);
module_exit(smsg_exit);
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(smsg_register_callback);
EXPORT_SYMBOL(smsg_unregister_callback);
