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[linux-3.10.git] / drivers / s390 / net / cu3088.c
1 /*
2  * $Id: cu3088.c,v 1.34 2004/06/15 13:16:27 pavlic Exp $
3  *
4  * CTC / LCS ccw_device driver
5  *
6  * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
7  * Author(s): Arnd Bergmann <arndb@de.ibm.com>
8  *            Cornelia Huck <cohuck@de.ibm.com>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2, or (at your option)
13  * any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23  *
24  */
25 \f
26 #include <linux/init.h>
27 #include <linux/module.h>
28 #include <linux/err.h>
29
30 #include <asm/ccwdev.h>
31 #include <asm/ccwgroup.h>
32
33 #include "cu3088.h"
34
35 const char *cu3088_type[] = {
36         "not a channel",
37         "CTC/A",
38         "ESCON channel",
39         "FICON channel",
40         "P390 LCS card",
41         "OSA LCS card",
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         { /* end of list */ }
55 };
56
57 static struct ccw_driver cu3088_driver;
58
59 struct device *cu3088_root_dev;
60
61 static ssize_t
62 group_write(struct device_driver *drv, const char *buf, size_t count)
63 {
64         const char *start, *end;
65         char bus_ids[2][BUS_ID_SIZE], *argv[2];
66         int i;
67         int ret;
68         struct ccwgroup_driver *cdrv;
69
70         cdrv = to_ccwgroupdrv(drv);
71         if (!cdrv)
72                 return -EINVAL;
73         start = buf;
74         for (i=0; i<2; i++) {
75                 static const char delim[] = {',', '\n'};
76                 int len;
77
78                 if (!(end = strchr(start, delim[i])))
79                         return count;
80                 len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start + 1);
81                 strlcpy (bus_ids[i], start, len);
82                 argv[i] = bus_ids[i];
83                 start = end + 1;
84         }
85
86         ret = ccwgroup_create(cu3088_root_dev, cdrv->driver_id,
87                               &cu3088_driver, 2, argv);
88
89         return (ret == 0) ? count : ret;
90 }
91
92 static DRIVER_ATTR(group, 0200, NULL, group_write);
93
94 /* Register-unregister for ctc&lcs */
95 int
96 register_cu3088_discipline(struct ccwgroup_driver *dcp) 
97 {
98         int rc;
99
100         if (!dcp)
101                 return -EINVAL;
102
103         /* Register discipline.*/
104         rc = ccwgroup_driver_register(dcp);
105         if (rc)
106                 return rc;
107
108         rc = driver_create_file(&dcp->driver, &driver_attr_group);
109         if (rc)
110                 ccwgroup_driver_unregister(dcp);
111                 
112         return rc;
113
114 }
115
116 void
117 unregister_cu3088_discipline(struct ccwgroup_driver *dcp)
118 {
119         if (!dcp)
120                 return;
121
122         driver_remove_file(&dcp->driver, &driver_attr_group);
123         ccwgroup_driver_unregister(dcp);
124 }
125
126 static struct ccw_driver cu3088_driver = {
127         .owner       = THIS_MODULE,
128         .ids         = cu3088_ids,
129         .name        = "cu3088",
130         .probe       = ccwgroup_probe_ccwdev,
131         .remove      = ccwgroup_remove_ccwdev,
132 };
133
134 /* module setup */
135 static int __init
136 cu3088_init (void)
137 {
138         int rc;
139         
140         cu3088_root_dev = s390_root_dev_register("cu3088");
141         if (IS_ERR(cu3088_root_dev))
142                 return PTR_ERR(cu3088_root_dev);
143         rc = ccw_driver_register(&cu3088_driver);
144         if (rc)
145                 s390_root_dev_unregister(cu3088_root_dev);
146
147         return rc;
148 }
149
150 static void __exit
151 cu3088_exit (void)
152 {
153         ccw_driver_unregister(&cu3088_driver);
154         s390_root_dev_unregister(cu3088_root_dev);
155 }
156
157 MODULE_DEVICE_TABLE(ccw,cu3088_ids);
158 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
159 MODULE_LICENSE("GPL");
160
161 module_init(cu3088_init);
162 module_exit(cu3088_exit);
163
164 EXPORT_SYMBOL_GPL(cu3088_type);
165 EXPORT_SYMBOL_GPL(register_cu3088_discipline);
166 EXPORT_SYMBOL_GPL(unregister_cu3088_discipline);