summaryrefslogtreecommitdiffstats
path: root/drivers/s390/net/smsgiucv.c
blob: b8179c27ceb6e1971bb78568ef82707cec64c8a1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
/*
 * 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 *from, 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 char sender[9];
	unsigned short len;
	int rc, i;

	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, NULL, NULL, NULL);
	if (rc == 0) {
		msg[len] = 0;
		EBCASC(msg, len);
		memcpy(sender, msg, 8);
		sender[8] = 0;
		/* Remove trailing whitespace from the sender name. */
		for (i = 7; i >= 0; i--) {
			if (sender[i] != ' ' && sender[i] != '\t')
				break;
			sender[i] = 0;
		}
		spin_lock(&smsg_list_lock);
		list_for_each_entry(cb, &smsg_list, list)
			if (strncmp(msg + 8, cb->prefix, cb->len) == 0) {
				cb->callback(sender, 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 *from, 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 *from, char *str))
{
	struct smsg_callback *cb, *tmp;

	spin_lock(&smsg_list_lock);
	cb = NULL;
	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", NULL, 0, NULL);
		iucv_sever(smsg_pathid, NULL);
		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, NULL);
	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, 255, NULL, "*MSG    ", NULL, 0,
			   NULL, NULL, smsg_handle, NULL);
	if (rc) {
		printk(KERN_ERR "SMSGIUCV: failed to connect to *MSG");
		iucv_unregister_program(smsg_handle);
		driver_unregister(&smsg_driver);
		smsg_handle = NULL;
		return -EIO;
	}
	cpcmd("SET SMSG IUCV", NULL, 0, NULL);
	return 0;
}

module_init(smsg_init);
module_exit(smsg_exit);
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(smsg_register_callback);
EXPORT_SYMBOL(smsg_unregister_callback);
OpenPOWER on IntegriCloud