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1da177e4 LT |
1 | /* |
2 | * IUCV special message driver | |
3 | * | |
6a1d96dc MS |
4 | * Copyright IBM Corp. 2003, 2009 |
5 | * | |
1da177e4 LT |
6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/device.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
5da5e658 | 28 | #include <net/iucv/iucv.h> |
1da177e4 LT |
29 | #include <asm/cpcmd.h> |
30 | #include <asm/ebcdic.h> | |
5da5e658 | 31 | #include "smsgiucv.h" |
1da177e4 LT |
32 | |
33 | struct smsg_callback { | |
34 | struct list_head list; | |
09003ed9 | 35 | const char *prefix; |
1da177e4 | 36 | int len; |
09003ed9 | 37 | void (*callback)(const char *from, char *str); |
1da177e4 LT |
38 | }; |
39 | ||
40 | MODULE_AUTHOR | |
41 | ("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)"); | |
42 | MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver"); | |
43 | ||
5da5e658 | 44 | static struct iucv_path *smsg_path; |
6a1d96dc MS |
45 | /* dummy device used as trigger for PM functions */ |
46 | static struct device *smsg_dev; | |
5da5e658 | 47 | |
1da177e4 | 48 | static DEFINE_SPINLOCK(smsg_list_lock); |
c11ca97e | 49 | static LIST_HEAD(smsg_list); |
1da177e4 | 50 | |
5da5e658 MS |
51 | static int smsg_path_pending(struct iucv_path *, u8 ipvmid[8], u8 ipuser[16]); |
52 | static void smsg_message_pending(struct iucv_path *, struct iucv_message *); | |
53 | ||
54 | static struct iucv_handler smsg_handler = { | |
55 | .path_pending = smsg_path_pending, | |
56 | .message_pending = smsg_message_pending, | |
57 | }; | |
58 | ||
59 | static int smsg_path_pending(struct iucv_path *path, u8 ipvmid[8], | |
60 | u8 ipuser[16]) | |
1da177e4 | 61 | { |
5da5e658 MS |
62 | if (strncmp(ipvmid, "*MSG ", sizeof(ipvmid)) != 0) |
63 | return -EINVAL; | |
64 | /* Path pending from *MSG. */ | |
65 | return iucv_path_accept(path, &smsg_handler, "SMSGIUCV ", NULL); | |
1da177e4 LT |
66 | } |
67 | ||
5da5e658 MS |
68 | static void smsg_message_pending(struct iucv_path *path, |
69 | struct iucv_message *msg) | |
1da177e4 LT |
70 | { |
71 | struct smsg_callback *cb; | |
5da5e658 | 72 | unsigned char *buffer; |
15439d74 | 73 | unsigned char sender[9]; |
15439d74 | 74 | int rc, i; |
1da177e4 | 75 | |
5da5e658 MS |
76 | buffer = kmalloc(msg->length + 1, GFP_ATOMIC | GFP_DMA); |
77 | if (!buffer) { | |
78 | iucv_message_reject(path, msg); | |
1da177e4 LT |
79 | return; |
80 | } | |
5da5e658 | 81 | rc = iucv_message_receive(path, msg, 0, buffer, msg->length, NULL); |
1da177e4 | 82 | if (rc == 0) { |
5da5e658 MS |
83 | buffer[msg->length] = 0; |
84 | EBCASC(buffer, msg->length); | |
85 | memcpy(sender, buffer, 8); | |
15439d74 MS |
86 | sender[8] = 0; |
87 | /* Remove trailing whitespace from the sender name. */ | |
88 | for (i = 7; i >= 0; i--) { | |
89 | if (sender[i] != ' ' && sender[i] != '\t') | |
90 | break; | |
91 | sender[i] = 0; | |
92 | } | |
1da177e4 LT |
93 | spin_lock(&smsg_list_lock); |
94 | list_for_each_entry(cb, &smsg_list, list) | |
5da5e658 MS |
95 | if (strncmp(buffer + 8, cb->prefix, cb->len) == 0) { |
96 | cb->callback(sender, buffer + 8); | |
1da177e4 LT |
97 | break; |
98 | } | |
99 | spin_unlock(&smsg_list_lock); | |
100 | } | |
5da5e658 | 101 | kfree(buffer); |
1da177e4 LT |
102 | } |
103 | ||
09003ed9 HB |
104 | int smsg_register_callback(const char *prefix, |
105 | void (*callback)(const char *from, char *str)) | |
1da177e4 LT |
106 | { |
107 | struct smsg_callback *cb; | |
108 | ||
109 | cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL); | |
110 | if (!cb) | |
111 | return -ENOMEM; | |
112 | cb->prefix = prefix; | |
113 | cb->len = strlen(prefix); | |
114 | cb->callback = callback; | |
5da5e658 | 115 | spin_lock_bh(&smsg_list_lock); |
1da177e4 | 116 | list_add_tail(&cb->list, &smsg_list); |
5da5e658 | 117 | spin_unlock_bh(&smsg_list_lock); |
1da177e4 LT |
118 | return 0; |
119 | } | |
120 | ||
09003ed9 HB |
121 | void smsg_unregister_callback(const char *prefix, |
122 | void (*callback)(const char *from, | |
123 | char *str)) | |
1da177e4 LT |
124 | { |
125 | struct smsg_callback *cb, *tmp; | |
126 | ||
5da5e658 | 127 | spin_lock_bh(&smsg_list_lock); |
d2c993d8 | 128 | cb = NULL; |
1da177e4 LT |
129 | list_for_each_entry(tmp, &smsg_list, list) |
130 | if (tmp->callback == callback && | |
131 | strcmp(tmp->prefix, prefix) == 0) { | |
132 | cb = tmp; | |
133 | list_del(&cb->list); | |
134 | break; | |
135 | } | |
5da5e658 | 136 | spin_unlock_bh(&smsg_list_lock); |
1da177e4 LT |
137 | kfree(cb); |
138 | } | |
139 | ||
6a1d96dc MS |
140 | static int smsg_pm_freeze(struct device *dev) |
141 | { | |
142 | #ifdef CONFIG_PM_DEBUG | |
143 | printk(KERN_WARNING "smsg_pm_freeze\n"); | |
144 | #endif | |
145 | if (smsg_path) | |
146 | iucv_path_sever(smsg_path, NULL); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static int smsg_pm_restore_thaw(struct device *dev) | |
151 | { | |
152 | int rc; | |
153 | ||
154 | #ifdef CONFIG_PM_DEBUG | |
155 | printk(KERN_WARNING "smsg_pm_restore_thaw\n"); | |
156 | #endif | |
157 | if (smsg_path) { | |
158 | memset(smsg_path, 0, sizeof(*smsg_path)); | |
159 | smsg_path->msglim = 255; | |
160 | smsg_path->flags = 0; | |
161 | rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ", | |
162 | NULL, NULL, NULL); | |
8ca45667 MS |
163 | #ifdef CONFIG_PM_DEBUG |
164 | if (rc) | |
165 | printk(KERN_ERR | |
166 | "iucv_path_connect returned with rc %i\n", rc); | |
167 | #endif | |
168 | cpcmd("SET SMSG IUCV", NULL, 0, NULL); | |
6a1d96dc MS |
169 | } |
170 | return 0; | |
171 | } | |
172 | ||
47145210 | 173 | static const struct dev_pm_ops smsg_pm_ops = { |
6a1d96dc MS |
174 | .freeze = smsg_pm_freeze, |
175 | .thaw = smsg_pm_restore_thaw, | |
176 | .restore = smsg_pm_restore_thaw, | |
177 | }; | |
178 | ||
5da5e658 | 179 | static struct device_driver smsg_driver = { |
6a1d96dc | 180 | .owner = THIS_MODULE, |
1ffaa640 | 181 | .name = SMSGIUCV_DRV_NAME, |
5da5e658 | 182 | .bus = &iucv_bus, |
6a1d96dc | 183 | .pm = &smsg_pm_ops, |
5da5e658 MS |
184 | }; |
185 | ||
186 | static void __exit smsg_exit(void) | |
1da177e4 | 187 | { |
5da5e658 | 188 | cpcmd("SET SMSG IUCV", NULL, 0, NULL); |
6a1d96dc | 189 | device_unregister(smsg_dev); |
5da5e658 MS |
190 | iucv_unregister(&smsg_handler, 1); |
191 | driver_unregister(&smsg_driver); | |
1da177e4 LT |
192 | } |
193 | ||
5da5e658 | 194 | static int __init smsg_init(void) |
1da177e4 | 195 | { |
1da177e4 LT |
196 | int rc; |
197 | ||
0fc3ddd6 CB |
198 | if (!MACHINE_IS_VM) { |
199 | rc = -EPROTONOSUPPORT; | |
200 | goto out; | |
201 | } | |
1da177e4 | 202 | rc = driver_register(&smsg_driver); |
5da5e658 MS |
203 | if (rc != 0) |
204 | goto out; | |
205 | rc = iucv_register(&smsg_handler, 1); | |
d5ddc809 | 206 | if (rc) |
5da5e658 | 207 | goto out_driver; |
5da5e658 MS |
208 | smsg_path = iucv_path_alloc(255, 0, GFP_KERNEL); |
209 | if (!smsg_path) { | |
210 | rc = -ENOMEM; | |
211 | goto out_register; | |
1da177e4 | 212 | } |
5da5e658 MS |
213 | rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ", |
214 | NULL, NULL, NULL); | |
d5ddc809 | 215 | if (rc) |
6a1d96dc MS |
216 | goto out_free_path; |
217 | smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL); | |
218 | if (!smsg_dev) { | |
219 | rc = -ENOMEM; | |
220 | goto out_free_path; | |
221 | } | |
222 | dev_set_name(smsg_dev, "smsg_iucv"); | |
223 | smsg_dev->bus = &iucv_bus; | |
224 | smsg_dev->parent = iucv_root; | |
225 | smsg_dev->release = (void (*)(struct device *))kfree; | |
226 | smsg_dev->driver = &smsg_driver; | |
227 | rc = device_register(smsg_dev); | |
228 | if (rc) | |
c6304933 | 229 | goto out_put; |
6a1d96dc | 230 | |
6b979de3 | 231 | cpcmd("SET SMSG IUCV", NULL, 0, NULL); |
1da177e4 | 232 | return 0; |
5da5e658 | 233 | |
c6304933 SO |
234 | out_put: |
235 | put_device(smsg_dev); | |
6a1d96dc | 236 | out_free_path: |
5da5e658 | 237 | iucv_path_free(smsg_path); |
6a1d96dc | 238 | smsg_path = NULL; |
5da5e658 MS |
239 | out_register: |
240 | iucv_unregister(&smsg_handler, 1); | |
241 | out_driver: | |
242 | driver_unregister(&smsg_driver); | |
243 | out: | |
244 | return rc; | |
1da177e4 LT |
245 | } |
246 | ||
247 | module_init(smsg_init); | |
248 | module_exit(smsg_exit); | |
249 | MODULE_LICENSE("GPL"); | |
250 | ||
251 | EXPORT_SYMBOL(smsg_register_callback); | |
252 | EXPORT_SYMBOL(smsg_unregister_callback); |