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: 1.14 $"
  30
  31 #include "zfcp_ext.h"
  32
  33 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  34
  35 /**
  36  * ZFCP_DEFINE_DRIVER_ATTR - define for all loglevels sysfs attributes
  37  * @_name:       name of attribute
  38  * @_define:     name of ZFCP loglevel define
  39  *
  40  * Generates store function for a sysfs loglevel attribute of zfcp driver.
  41  */
  42 #define ZFCP_DEFINE_DRIVER_ATTR(_name, _define)                               \
  43 static ssize_t zfcp_sysfs_loglevel_##_name##_store(struct device_driver *drv, \
  44                                                    const char *buf,           \
  45                                                    size_t count)              \
  46 {                                                                             \
  47         unsigned int loglevel;                                                \
  48         unsigned int new_loglevel;                                            \
  49         char *endp;                                                           \
  50                                                                               \
  51         new_loglevel = simple_strtoul(buf, &endp, 0);                         \
  52         if ((endp + 1) < (buf + count))                                       \
  53                 return -EINVAL;                                               \
  54         if (new_loglevel > 3)                                                 \
  55                 return -EINVAL;                                               \
  56         down(&zfcp_data.config_sema);                                         \
  57         loglevel = atomic_read(&zfcp_data.loglevel);                          \
  58         loglevel &= ~((unsigned int) 0xf << (ZFCP_LOG_AREA_##_define << 2));  \
  59         loglevel |= new_loglevel << (ZFCP_LOG_AREA_##_define << 2);           \
  60         atomic_set(&zfcp_data.loglevel, loglevel);                            \
  61         up(&zfcp_data.config_sema);                                           \
  62         return count;                                                         \
  63 }                                                                             \
  64                                                                               \
  65 static ssize_t zfcp_sysfs_loglevel_##_name##_show(struct device_driver *dev,  \
  66                                                   char *buf)                  \
  67 {                                                                             \
  68         return sprintf(buf,"%d\n",                                            \
  69                        ZFCP_GET_LOG_VALUE(ZFCP_LOG_AREA_##_define));          \
  70 }                                                                             \
  71                                                                               \
  72 static DRIVER_ATTR(loglevel_##_name, S_IWUSR | S_IRUGO,                       \
  73                    zfcp_sysfs_loglevel_##_name##_show,                        \
  74                    zfcp_sysfs_loglevel_##_name##_store);
  75
  76 ZFCP_DEFINE_DRIVER_ATTR(other, OTHER);
  77 ZFCP_DEFINE_DRIVER_ATTR(scsi, SCSI);
  78 ZFCP_DEFINE_DRIVER_ATTR(fsf, FSF);
  79 ZFCP_DEFINE_DRIVER_ATTR(config, CONFIG);
  80 ZFCP_DEFINE_DRIVER_ATTR(cio, CIO);
  81 ZFCP_DEFINE_DRIVER_ATTR(qdio, QDIO);
  82 ZFCP_DEFINE_DRIVER_ATTR(erp, ERP);
  83 ZFCP_DEFINE_DRIVER_ATTR(fc, FC);
  84
  85 static ssize_t zfcp_sysfs_version_show(struct device_driver *dev,
  86                                               char *buf)
  87 {
  88         return sprintf(buf, "%s\n", ZFCP_VERSION);
  89 }
  90
  91 static DRIVER_ATTR(version, S_IRUGO, zfcp_sysfs_version_show, NULL);
  92
  93 static struct attribute *zfcp_driver_attrs[] = {
  94         &driver_attr_loglevel_other.attr,
  95         &driver_attr_loglevel_scsi.attr,
  96         &driver_attr_loglevel_fsf.attr,
  97         &driver_attr_loglevel_config.attr,
  98         &driver_attr_loglevel_cio.attr,
  99         &driver_attr_loglevel_qdio.attr,
 100         &driver_attr_loglevel_erp.attr,
 101         &driver_attr_loglevel_fc.attr,
 102         &driver_attr_version.attr,
 103         NULL
 104 };
 105
 106 static struct attribute_group zfcp_driver_attr_group = {
 107         .attrs = zfcp_driver_attrs,
 108 };
 109
 110 /**
 111  * zfcp_sysfs_create_driver_files - create sysfs driver files
 112  * @dev: pointer to belonging device
 113  *
 114  * Create all sysfs attributes of the zfcp device driver
 115  */
 116 int
 117 zfcp_sysfs_driver_create_files(struct device_driver *drv)
 118 {
 119         return sysfs_create_group(&drv->kobj, &zfcp_driver_attr_group);
 120 }
 121
 122 /**
 123  * zfcp_sysfs_remove_driver_files - remove sysfs driver files
 124  * @dev: pointer to belonging device
 125  *
 126  * Remove all sysfs attributes of the zfcp device driver
 127  */
 128 void
 129 zfcp_sysfs_driver_remove_files(struct device_driver *drv)
 130 {
 131         sysfs_remove_group(&drv->kobj, &zfcp_driver_attr_group);
 132 }
 133
 134 #undef ZFCP_LOG_AREA