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23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/errno.h>
26#include <linux/device.h>
27#include <linux/slab.h>
28#include <net/iucv/iucv.h>
29#include <asm/cpcmd.h>
30#include <asm/ebcdic.h>
31#include "smsgiucv.h"
32
33struct smsg_callback {
34 struct list_head list;
35 const char *prefix;
36 int len;
37 void (*callback)(const char *from, char *str);
38};
39
40MODULE_AUTHOR
41 ("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)");
42MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver");
43
44static struct iucv_path *smsg_path;
45
46static struct device *smsg_dev;
47
48static DEFINE_SPINLOCK(smsg_list_lock);
49static LIST_HEAD(smsg_list);
50static int iucv_path_connected;
51
52static int smsg_path_pending(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]);
53static void smsg_message_pending(struct iucv_path *, struct iucv_message *);
54
55static struct iucv_handler smsg_handler = {
56 .path_pending = smsg_path_pending,
57 .message_pending = smsg_message_pending,
58};
59
60static int smsg_path_pending(struct iucv_path *path, u8 ipvmid[8],
61 u8 ipuser[16])
62{
63 if (strncmp(ipvmid, "*MSG ", 8) != 0)
64 return -EINVAL;
65
66 return iucv_path_accept(path, &smsg_handler, "SMSGIUCV ", NULL);
67}
68
69static void smsg_message_pending(struct iucv_path *path,
70 struct iucv_message *msg)
71{
72 struct smsg_callback *cb;
73 unsigned char *buffer;
74 unsigned char sender[9];
75 int rc, i;
76
77 buffer = kmalloc(msg->length + 1, GFP_ATOMIC | GFP_DMA);
78 if (!buffer) {
79 iucv_message_reject(path, msg);
80 return;
81 }
82 rc = iucv_message_receive(path, msg, 0, buffer, msg->length, NULL);
83 if (rc == 0) {
84 buffer[msg->length] = 0;
85 EBCASC(buffer, msg->length);
86 memcpy(sender, buffer, 8);
87 sender[8] = 0;
88
89 for (i = 7; i >= 0; i--) {
90 if (sender[i] != ' ' && sender[i] != '\t')
91 break;
92 sender[i] = 0;
93 }
94 spin_lock(&smsg_list_lock);
95 list_for_each_entry(cb, &smsg_list, list)
96 if (strncmp(buffer + 8, cb->prefix, cb->len) == 0) {
97 cb->callback(sender, buffer + 8);
98 break;
99 }
100 spin_unlock(&smsg_list_lock);
101 }
102 kfree(buffer);
103}
104
105int smsg_register_callback(const char *prefix,
106 void (*callback)(const char *from, char *str))
107{
108 struct smsg_callback *cb;
109
110 cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL);
111 if (!cb)
112 return -ENOMEM;
113 cb->prefix = prefix;
114 cb->len = strlen(prefix);
115 cb->callback = callback;
116 spin_lock_bh(&smsg_list_lock);
117 list_add_tail(&cb->list, &smsg_list);
118 spin_unlock_bh(&smsg_list_lock);
119 return 0;
120}
121
122void smsg_unregister_callback(const char *prefix,
123 void (*callback)(const char *from,
124 char *str))
125{
126 struct smsg_callback *cb, *tmp;
127
128 spin_lock_bh(&smsg_list_lock);
129 cb = NULL;
130 list_for_each_entry(tmp, &smsg_list, list)
131 if (tmp->callback == callback &&
132 strcmp(tmp->prefix, prefix) == 0) {
133 cb = tmp;
134 list_del(&cb->list);
135 break;
136 }
137 spin_unlock_bh(&smsg_list_lock);
138 kfree(cb);
139}
140
141static int smsg_pm_freeze(struct device *dev)
142{
143#ifdef CONFIG_PM_DEBUG
144 printk(KERN_WARNING "smsg_pm_freeze\n");
145#endif
146 if (smsg_path && iucv_path_connected) {
147 iucv_path_sever(smsg_path, NULL);
148 iucv_path_connected = 0;
149 }
150 return 0;
151}
152
153static int smsg_pm_restore_thaw(struct device *dev)
154{
155 int rc;
156
157#ifdef CONFIG_PM_DEBUG
158 printk(KERN_WARNING "smsg_pm_restore_thaw\n");
159#endif
160 if (smsg_path && iucv_path_connected) {
161 memset(smsg_path, 0, sizeof(*smsg_path));
162 smsg_path->msglim = 255;
163 smsg_path->flags = 0;
164 rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ",
165 NULL, NULL, NULL);
166#ifdef CONFIG_PM_DEBUG
167 if (rc)
168 printk(KERN_ERR
169 "iucv_path_connect returned with rc %i\n", rc);
170#endif
171 if (!rc)
172 iucv_path_connected = 1;
173 cpcmd("SET SMSG IUCV", NULL, 0, NULL);
174 }
175 return 0;
176}
177
178static const struct dev_pm_ops smsg_pm_ops = {
179 .freeze = smsg_pm_freeze,
180 .thaw = smsg_pm_restore_thaw,
181 .restore = smsg_pm_restore_thaw,
182};
183
184static struct device_driver smsg_driver = {
185 .owner = THIS_MODULE,
186 .name = SMSGIUCV_DRV_NAME,
187 .bus = &iucv_bus,
188 .pm = &smsg_pm_ops,
189};
190
191static void __exit smsg_exit(void)
192{
193 cpcmd("SET SMSG IUCV", NULL, 0, NULL);
194 device_unregister(smsg_dev);
195 iucv_unregister(&smsg_handler, 1);
196 driver_unregister(&smsg_driver);
197}
198
199static int __init smsg_init(void)
200{
201 int rc;
202
203 if (!MACHINE_IS_VM) {
204 rc = -EPROTONOSUPPORT;
205 goto out;
206 }
207 rc = driver_register(&smsg_driver);
208 if (rc != 0)
209 goto out;
210 rc = iucv_register(&smsg_handler, 1);
211 if (rc)
212 goto out_driver;
213 smsg_path = iucv_path_alloc(255, 0, GFP_KERNEL);
214 if (!smsg_path) {
215 rc = -ENOMEM;
216 goto out_register;
217 }
218 rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ",
219 NULL, NULL, NULL);
220 if (rc)
221 goto out_free_path;
222 else
223 iucv_path_connected = 1;
224 smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
225 if (!smsg_dev) {
226 rc = -ENOMEM;
227 goto out_free_path;
228 }
229 dev_set_name(smsg_dev, "smsg_iucv");
230 smsg_dev->bus = &iucv_bus;
231 smsg_dev->parent = iucv_root;
232 smsg_dev->release = (void (*)(struct device *))kfree;
233 smsg_dev->driver = &smsg_driver;
234 rc = device_register(smsg_dev);
235 if (rc)
236 goto out_put;
237
238 cpcmd("SET SMSG IUCV", NULL, 0, NULL);
239 return 0;
240
241out_put:
242 put_device(smsg_dev);
243out_free_path:
244 iucv_path_free(smsg_path);
245 smsg_path = NULL;
246out_register:
247 iucv_unregister(&smsg_handler, 1);
248out_driver:
249 driver_unregister(&smsg_driver);
250out:
251 return rc;
252}
253
254module_init(smsg_init);
255module_exit(smsg_exit);
256MODULE_LICENSE("GPL");
257
258EXPORT_SYMBOL(smsg_register_callback);
259EXPORT_SYMBOL(smsg_unregister_callback);
260
