Pull sn-handle-sc-powerdown into release branch
[linux-2.6] / drivers / s390 / net / cu3088.c
1 /*
2  * CTC / LCS ccw_device driver
3  *
4  * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
5  * Author(s): Arnd Bergmann <arndb@de.ibm.com>
6  *            Cornelia Huck <cornelia.huck@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 \f
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/err.h>
27
28 #include <asm/s390_rdev.h>
29 #include <asm/ccwdev.h>
30 #include <asm/ccwgroup.h>
31
32 #include "cu3088.h"
33
34 const char *cu3088_type[] = {
35         "not a channel",
36         "CTC/A",
37         "ESCON channel",
38         "FICON channel",
39         "P390 LCS card",
40         "OSA LCS card",
41         "CLAW channel device",
42         "unknown channel type",
43         "unsupported channel type",
44 };
45
46 /* static definitions */
47
48 static struct ccw_device_id cu3088_ids[] = {
49         { CCW_DEVICE(0x3088, 0x08), .driver_info = channel_type_parallel },
50         { CCW_DEVICE(0x3088, 0x1f), .driver_info = channel_type_escon },
51         { CCW_DEVICE(0x3088, 0x1e), .driver_info = channel_type_ficon },
52         { CCW_DEVICE(0x3088, 0x01), .driver_info = channel_type_p390 },
53         { CCW_DEVICE(0x3088, 0x60), .driver_info = channel_type_osa2 },
54         { CCW_DEVICE(0x3088, 0x61), .driver_info = channel_type_claw },
55         { /* end of list */ }
56 };
57
58 static struct ccw_driver cu3088_driver;
59
60 struct device *cu3088_root_dev;
61
62 static ssize_t
63 group_write(struct device_driver *drv, const char *buf, size_t count)
64 {
65         const char *start, *end;
66         char bus_ids[2][BUS_ID_SIZE], *argv[2];
67         int i;
68         int ret;
69         struct ccwgroup_driver *cdrv;
70
71         cdrv = to_ccwgroupdrv(drv);
72         if (!cdrv)
73                 return -EINVAL;
74         start = buf;
75         for (i=0; i<2; i++) {
76                 static const char delim[] = {',', '\n'};
77                 int len;
78
79                 if (!(end = strchr(start, delim[i])))
80                         return count;
81                 len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start + 1);
82                 strlcpy (bus_ids[i], start, len);
83                 argv[i] = bus_ids[i];
84                 start = end + 1;
85         }
86
87         ret = ccwgroup_create(cu3088_root_dev, cdrv->driver_id,
88                               &cu3088_driver, 2, argv);
89
90         return (ret == 0) ? count : ret;
91 }
92
93 static DRIVER_ATTR(group, 0200, NULL, group_write);
94
95 /* Register-unregister for ctc&lcs */
96 int
97 register_cu3088_discipline(struct ccwgroup_driver *dcp) 
98 {
99         int rc;
100
101         if (!dcp)
102                 return -EINVAL;
103
104         /* Register discipline.*/
105         rc = ccwgroup_driver_register(dcp);
106         if (rc)
107                 return rc;
108
109         rc = driver_create_file(&dcp->driver, &driver_attr_group);
110         if (rc)
111                 ccwgroup_driver_unregister(dcp);
112                 
113         return rc;
114
115 }
116
117 void
118 unregister_cu3088_discipline(struct ccwgroup_driver *dcp)
119 {
120         if (!dcp)
121                 return;
122
123         driver_remove_file(&dcp->driver, &driver_attr_group);
124         ccwgroup_driver_unregister(dcp);
125 }
126
127 static struct ccw_driver cu3088_driver = {
128         .owner       = THIS_MODULE,
129         .ids         = cu3088_ids,
130         .name        = "cu3088",
131         .probe       = ccwgroup_probe_ccwdev,
132         .remove      = ccwgroup_remove_ccwdev,
133 };
134
135 /* module setup */
136 static int __init
137 cu3088_init (void)
138 {
139         int rc;
140         
141         cu3088_root_dev = s390_root_dev_register("cu3088");
142         if (IS_ERR(cu3088_root_dev))
143                 return PTR_ERR(cu3088_root_dev);
144         rc = ccw_driver_register(&cu3088_driver);
145         if (rc)
146                 s390_root_dev_unregister(cu3088_root_dev);
147
148         return rc;
149 }
150
151 static void __exit
152 cu3088_exit (void)
153 {
154         ccw_driver_unregister(&cu3088_driver);
155         s390_root_dev_unregister(cu3088_root_dev);
156 }
157
158 MODULE_DEVICE_TABLE(ccw,cu3088_ids);
159 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
160 MODULE_LICENSE("GPL");
161
162 module_init(cu3088_init);
163 module_exit(cu3088_exit);
164
165 EXPORT_SYMBOL_GPL(cu3088_type);
166 EXPORT_SYMBOL_GPL(register_cu3088_discipline);
167 EXPORT_SYMBOL_GPL(unregister_cu3088_discipline);