drivers/s390/net/cu3088.c

   1 /*
   2  * $Id: cu3088.c,v 1.38 2006/01/12 14:33:09 cohuck 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 <cornelia.huck@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/s390_rdev.h>
  31 #include <asm/ccwdev.h>
  32 #include <asm/ccwgroup.h>
  33
  34 #include "cu3088.h"
  35
  36 const char *cu3088_type[] = {
  37         "not a channel",
  38         "CTC/A",
  39         "ESCON channel",
  40         "FICON channel",
  41         "P390 LCS card",
  42         "OSA LCS card",
  43         "CLAW channel device",
  44         "unknown channel type",
  45         "unsupported channel type",
  46 };
  47
  48 /* static definitions */
  49
  50 static struct ccw_device_id cu3088_ids[] = {
  51         { CCW_DEVICE(0x3088, 0x08), .driver_info = channel_type_parallel },
  52         { CCW_DEVICE(0x3088, 0x1f), .driver_info = channel_type_escon },
  53         { CCW_DEVICE(0x3088, 0x1e), .driver_info = channel_type_ficon },
  54         { CCW_DEVICE(0x3088, 0x01), .driver_info = channel_type_p390 },
  55         { CCW_DEVICE(0x3088, 0x60), .driver_info = channel_type_osa2 },
  56         { CCW_DEVICE(0x3088, 0x61), .driver_info = channel_type_claw },
  57         { /* end of list */ }
  58 };
  59
  60 static struct ccw_driver cu3088_driver;
  61
  62 struct device *cu3088_root_dev;
  63
  64 static ssize_t
  65 group_write(struct device_driver *drv, const char *buf, size_t count)
  66 {
  67         const char *start, *end;
  68         char bus_ids[2][BUS_ID_SIZE], *argv[2];
  69         int i;
  70         int ret;
  71         struct ccwgroup_driver *cdrv;
  72
  73         cdrv = to_ccwgroupdrv(drv);
  74         if (!cdrv)
  75                 return -EINVAL;
  76         start = buf;
  77         for (i=0; i<2; i++) {
  78                 static const char delim[] = {',', '\n'};
  79                 int len;
  80
  81                 if (!(end = strchr(start, delim[i])))
  82                         return count;
  83                 len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start + 1);
  84                 strlcpy (bus_ids[i], start, len);
  85                 argv[i] = bus_ids[i];
  86                 start = end + 1;
  87         }
  88
  89         ret = ccwgroup_create(cu3088_root_dev, cdrv->driver_id,
  90                               &cu3088_driver, 2, argv);
  91
  92         return (ret == 0) ? count : ret;
  93 }
  94
  95 static DRIVER_ATTR(group, 0200, NULL, group_write);
  96
  97 /* Register-unregister for ctc&lcs */
  98 int
  99 register_cu3088_discipline(struct ccwgroup_driver *dcp)
 100 {
 101         int rc;
 102
 103         if (!dcp)
 104                 return -EINVAL;
 105
 106         /* Register discipline.*/
 107         rc = ccwgroup_driver_register(dcp);
 108         if (rc)
 109                 return rc;
 110
 111         rc = driver_create_file(&dcp->driver, &driver_attr_group);
 112         if (rc)
 113                 ccwgroup_driver_unregister(dcp);
 114
 115         return rc;
 116
 117 }
 118
 119 void
 120 unregister_cu3088_discipline(struct ccwgroup_driver *dcp)
 121 {
 122         if (!dcp)
 123                 return;
 124
 125         driver_remove_file(&dcp->driver, &driver_attr_group);
 126         ccwgroup_driver_unregister(dcp);
 127 }
 128
 129 static struct ccw_driver cu3088_driver = {
 130         .owner       = THIS_MODULE,
 131         .ids         = cu3088_ids,
 132         .name        = "cu3088",
 133         .probe       = ccwgroup_probe_ccwdev,
 134         .remove      = ccwgroup_remove_ccwdev,
 135 };
 136
 137 /* module setup */
 138 static int __init
 139 cu3088_init (void)
 140 {
 141         int rc;
 142
 143         cu3088_root_dev = s390_root_dev_register("cu3088");
 144         if (IS_ERR(cu3088_root_dev))
 145                 return PTR_ERR(cu3088_root_dev);
 146         rc = ccw_driver_register(&cu3088_driver);
 147         if (rc)
 148                 s390_root_dev_unregister(cu3088_root_dev);
 149
 150         return rc;
 151 }
 152
 153 static void __exit
 154 cu3088_exit (void)
 155 {
 156         ccw_driver_unregister(&cu3088_driver);
 157         s390_root_dev_unregister(cu3088_root_dev);
 158 }
 159
 160 MODULE_DEVICE_TABLE(ccw,cu3088_ids);
 161 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 162 MODULE_LICENSE("GPL");
 163
 164 module_init(cu3088_init);
 165 module_exit(cu3088_exit);
 166
 167 EXPORT_SYMBOL_GPL(cu3088_type);
 168 EXPORT_SYMBOL_GPL(register_cu3088_discipline);
 169 EXPORT_SYMBOL_GPL(unregister_cu3088_discipline);