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);