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);