drivers/s390/scsi/zfcp_sysfs_driver.c

   1 /*
   2  * linux/drivers/s390/scsi/zfcp_sysfs_driver.c
   3  *
   4  * FCP adapter driver for IBM eServer zSeries
   5  *
   6  * sysfs driver related routines
   7  *
   8  * (C) Copyright IBM Corp. 2003, 2004
   9  *
  10  * Authors:
  11  *      Martin Peschke <mpeschke@de.ibm.com>
  12  *      Heiko Carstens <heiko.carstens@de.ibm.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2, or (at your option)
  17  * any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  27  */
  28
  29 #define ZFCP_SYSFS_DRIVER_C_REVISION "$Revision: 1.12 $"
  30
  31 #include <asm/ccwdev.h>
  32 #include "zfcp_ext.h"
  33 #include "zfcp_def.h"
  34
  35 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  36
  37 /**
  38  * ZFCP_DEFINE_DRIVER_ATTR - define for all loglevels sysfs attributes
  39  * @_name:       name of attribute
  40  * @_define:     name of ZFCP loglevel define
  41  *
  42  * Generates store function for a sysfs loglevel attribute of zfcp driver.
  43  */
  44 #define ZFCP_DEFINE_DRIVER_ATTR(_name, _define)                               \
  45 static ssize_t zfcp_sysfs_loglevel_##_name##_store(struct device_driver *drv, \
  46                                                    const char *buf,           \
  47                                                    size_t count)              \
  48 {                                                                             \
  49         unsigned int loglevel;                                                \
  50         unsigned int new_loglevel;                                            \
  51         char *endp;                                                           \
  52                                                                               \
  53         new_loglevel = simple_strtoul(buf, &endp, 0);                         \
  54         if ((endp + 1) < (buf + count))                                       \
  55                 return -EINVAL;                                               \
  56         if (new_loglevel > 3)                                                 \
  57                 return -EINVAL;                                               \
  58         down(&zfcp_data.config_sema);                                         \
  59         loglevel = atomic_read(&zfcp_data.loglevel);                          \
  60         loglevel &= ~((unsigned int) 0xf << (ZFCP_LOG_AREA_##_define << 2));  \
  61         loglevel |= new_loglevel << (ZFCP_LOG_AREA_##_define << 2);           \
  62         atomic_set(&zfcp_data.loglevel, loglevel);                            \
  63         up(&zfcp_data.config_sema);                                           \
  64         return count;                                                         \
  65 }                                                                             \
  66                                                                               \
  67 static ssize_t zfcp_sysfs_loglevel_##_name##_show(struct device_driver *dev,  \
  68                                                   char *buf)                  \
  69 {                                                                             \
  70         return sprintf(buf,"%d\n",                                            \
  71                        ZFCP_GET_LOG_VALUE(ZFCP_LOG_AREA_##_define));          \
  72 }                                                                             \
  73                                                                               \
  74 static DRIVER_ATTR(loglevel_##_name, S_IWUSR | S_IRUGO,                       \
  75                    zfcp_sysfs_loglevel_##_name##_show,                        \
  76                    zfcp_sysfs_loglevel_##_name##_store);
  77
  78 ZFCP_DEFINE_DRIVER_ATTR(other, OTHER);
  79 ZFCP_DEFINE_DRIVER_ATTR(scsi, SCSI);
  80 ZFCP_DEFINE_DRIVER_ATTR(fsf, FSF);
  81 ZFCP_DEFINE_DRIVER_ATTR(config, CONFIG);
  82 ZFCP_DEFINE_DRIVER_ATTR(cio, CIO);
  83 ZFCP_DEFINE_DRIVER_ATTR(qdio, QDIO);
  84 ZFCP_DEFINE_DRIVER_ATTR(erp, ERP);
  85 ZFCP_DEFINE_DRIVER_ATTR(fc, FC);
  86
  87 static ssize_t zfcp_sysfs_version_show(struct device_driver *dev,
  88                                               char *buf)
  89 {
  90         return sprintf(buf, "%s\n", ZFCP_VERSION);
  91 }
  92
  93 static DRIVER_ATTR(version, S_IRUGO, zfcp_sysfs_version_show, NULL);
  94
  95 static struct attribute *zfcp_driver_attrs[] = {
  96         &driver_attr_loglevel_other.attr,
  97         &driver_attr_loglevel_scsi.attr,
  98         &driver_attr_loglevel_fsf.attr,
  99         &driver_attr_loglevel_config.attr,
 100         &driver_attr_loglevel_cio.attr,
 101         &driver_attr_loglevel_qdio.attr,
 102         &driver_attr_loglevel_erp.attr,
 103         &driver_attr_loglevel_fc.attr,
 104         &driver_attr_version.attr,
 105         NULL
 106 };
 107
 108 static struct attribute_group zfcp_driver_attr_group = {
 109         .attrs = zfcp_driver_attrs,
 110 };
 111
 112 /**
 113  * zfcp_sysfs_create_driver_files - create sysfs driver files
 114  * @dev: pointer to belonging device
 115  *
 116  * Create all sysfs attributes of the zfcp device driver
 117  */
 118 int
 119 zfcp_sysfs_driver_create_files(struct device_driver *drv)
 120 {
 121         return sysfs_create_group(&drv->kobj, &zfcp_driver_attr_group);
 122 }
 123
 124 /**
 125  * zfcp_sysfs_remove_driver_files - remove sysfs driver files
 126  * @dev: pointer to belonging device
 127  *
 128  * Remove all sysfs attributes of the zfcp device driver
 129  */
 130 void
 131 zfcp_sysfs_driver_remove_files(struct device_driver *drv)
 132 {
 133         sysfs_remove_group(&drv->kobj, &zfcp_driver_attr_group);
 134 }
 135
 136 #undef ZFCP_LOG_AREA