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  *      Andreas Herrmann <aherrman@de.ibm.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2, or (at your option)
  18  * any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  28  */
  29
  30 #define ZFCP_SYSFS_DRIVER_C_REVISION "$Revision: 1.17 $"
  31
  32 #include "zfcp_ext.h"
  33
  34 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  35
  36 /**
  37  * ZFCP_DEFINE_DRIVER_ATTR - define for all loglevels sysfs attributes
  38  * @_name:       name of attribute
  39  * @_define:     name of ZFCP loglevel define
  40  *
  41  * Generates store function for a sysfs loglevel attribute of zfcp driver.
  42  */
  43 #define ZFCP_DEFINE_DRIVER_ATTR(_name, _define)                               \
  44 static ssize_t zfcp_sysfs_loglevel_##_name##_store(struct device_driver *drv, \
  45                                                    const char *buf,           \
  46                                                    size_t count)              \
  47 {                                                                             \
  48         unsigned int loglevel;                                                \
  49         unsigned int new_loglevel;                                            \
  50         char *endp;                                                           \
  51                                                                               \
  52         new_loglevel = simple_strtoul(buf, &endp, 0);                         \
  53         if ((endp + 1) < (buf + count))                                       \
  54                 return -EINVAL;                                               \
  55         if (new_loglevel > 3)                                                 \
  56                 return -EINVAL;                                               \
  57         down(&zfcp_data.config_sema);                                         \
  58         loglevel = atomic_read(&zfcp_data.loglevel);                          \
  59         loglevel &= ~((unsigned int) 0xf << (ZFCP_LOG_AREA_##_define << 2));  \
  60         loglevel |= new_loglevel << (ZFCP_LOG_AREA_##_define << 2);           \
  61         atomic_set(&zfcp_data.loglevel, loglevel);                            \
  62         up(&zfcp_data.config_sema);                                           \
  63         return count;                                                         \
  64 }                                                                             \
  65                                                                               \
  66 static ssize_t zfcp_sysfs_loglevel_##_name##_show(struct device_driver *dev,  \
  67                                                   char *buf)                  \
  68 {                                                                             \
  69         return sprintf(buf,"%d\n", (unsigned int)                             \
  70                        ZFCP_GET_LOG_VALUE(ZFCP_LOG_AREA_##_define));          \
  71 }                                                                             \
  72                                                                               \
  73 static DRIVER_ATTR(loglevel_##_name, S_IWUSR | S_IRUGO,                       \
  74                    zfcp_sysfs_loglevel_##_name##_show,                        \
  75                    zfcp_sysfs_loglevel_##_name##_store);
  76
  77 ZFCP_DEFINE_DRIVER_ATTR(other, OTHER);
  78 ZFCP_DEFINE_DRIVER_ATTR(scsi, SCSI);
  79 ZFCP_DEFINE_DRIVER_ATTR(fsf, FSF);
  80 ZFCP_DEFINE_DRIVER_ATTR(config, CONFIG);
  81 ZFCP_DEFINE_DRIVER_ATTR(cio, CIO);
  82 ZFCP_DEFINE_DRIVER_ATTR(qdio, QDIO);
  83 ZFCP_DEFINE_DRIVER_ATTR(erp, ERP);
  84 ZFCP_DEFINE_DRIVER_ATTR(fc, FC);
  85
  86 static ssize_t zfcp_sysfs_version_show(struct device_driver *dev,
  87                                               char *buf)
  88 {
  89         return sprintf(buf, "%s\n", zfcp_data.driver_version);
  90 }
  91
  92 static DRIVER_ATTR(version, S_IRUGO, zfcp_sysfs_version_show, NULL);
  93
  94 static struct attribute *zfcp_driver_attrs[] = {
  95         &driver_attr_loglevel_other.attr,
  96         &driver_attr_loglevel_scsi.attr,
  97         &driver_attr_loglevel_fsf.attr,
  98         &driver_attr_loglevel_config.attr,
  99         &driver_attr_loglevel_cio.attr,
 100         &driver_attr_loglevel_qdio.attr,
 101         &driver_attr_loglevel_erp.attr,
 102         &driver_attr_loglevel_fc.attr,
 103         &driver_attr_version.attr,
 104         NULL
 105 };
 106
 107 static struct attribute_group zfcp_driver_attr_group = {
 108         .attrs = zfcp_driver_attrs,
 109 };
 110
 111 /**
 112  * zfcp_sysfs_create_driver_files - create sysfs driver files
 113  * @dev: pointer to belonging device
 114  *
 115  * Create all sysfs attributes of the zfcp device driver
 116  */
 117 int
 118 zfcp_sysfs_driver_create_files(struct device_driver *drv)
 119 {
 120         return sysfs_create_group(&drv->kobj, &zfcp_driver_attr_group);
 121 }
 122
 123 /**
 124  * zfcp_sysfs_remove_driver_files - remove sysfs driver files
 125  * @dev: pointer to belonging device
 126  *
 127  * Remove all sysfs attributes of the zfcp device driver
 128  */
 129 void
 130 zfcp_sysfs_driver_remove_files(struct device_driver *drv)
 131 {
 132         sysfs_remove_group(&drv->kobj, &zfcp_driver_attr_group);
 133 }
 134
 135 #undef ZFCP_LOG_AREA