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