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
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
34const 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
48static 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
58static struct ccw_driver cu3088_driver;
59
60static struct device *cu3088_root_dev;
61
62static ssize_t
63group_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 -EINVAL;
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
93static DRIVER_ATTR(group, 0200, NULL, group_write);
94
95/* Register-unregister for ctc&lcs */
96int
97register_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
117void
118unregister_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
127static 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 */
136static int __init
137cu3088_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
151static void __exit
152cu3088_exit (void)
153{
154	ccw_driver_unregister(&cu3088_driver);
155	s390_root_dev_unregister(cu3088_root_dev);
156}
157
158MODULE_DEVICE_TABLE(ccw,cu3088_ids);
159MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
160MODULE_LICENSE("GPL");
161
162module_init(cu3088_init);
163module_exit(cu3088_exit);
164
165EXPORT_SYMBOL_GPL(cu3088_type);
166EXPORT_SYMBOL_GPL(register_cu3088_discipline);
167EXPORT_SYMBOL_GPL(unregister_cu3088_discipline);
168