drivers/s390/scsi/zfcp_sysfs_driver.c

   1 /*
   2  * This file is part of the zfcp device driver for
   3  * FCP adapters for IBM System z9 and zSeries.
   4  *
   5  * (C) Copyright IBM Corp. 2002, 2006
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "zfcp_ext.h"
  23
  24 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  25
  26 /**
  27  * ZFCP_DEFINE_DRIVER_ATTR - define for all loglevels sysfs attributes
  28  * @_name:       name of attribute
  29  * @_define:     name of ZFCP loglevel define
  30  *
  31  * Generates store function for a sysfs loglevel attribute of zfcp driver.
  32  */
  33 #define ZFCP_DEFINE_DRIVER_ATTR(_name, _define)                               \
  34 static ssize_t zfcp_sysfs_loglevel_##_name##_store(struct device_driver *drv, \
  35                                                    const char *buf,           \
  36                                                    size_t count)              \
  37 {                                                                             \
  38         unsigned int loglevel;                                                \
  39         unsigned int new_loglevel;                                            \
  40         char *endp;                                                           \
  41                                                                               \
  42         new_loglevel = simple_strtoul(buf, &endp, 0);                         \
  43         if ((endp + 1) < (buf + count))                                       \
  44                 return -EINVAL;                                               \
  45         if (new_loglevel > 3)                                                 \
  46                 return -EINVAL;                                               \
  47         down(&zfcp_data.config_sema);                                         \
  48         loglevel = atomic_read(&zfcp_data.loglevel);                          \
  49         loglevel &= ~((unsigned int) 0xf << (ZFCP_LOG_AREA_##_define << 2));  \
  50         loglevel |= new_loglevel << (ZFCP_LOG_AREA_##_define << 2);           \
  51         atomic_set(&zfcp_data.loglevel, loglevel);                            \
  52         up(&zfcp_data.config_sema);                                           \
  53         return count;                                                         \
  54 }                                                                             \
  55                                                                               \
  56 static ssize_t zfcp_sysfs_loglevel_##_name##_show(struct device_driver *dev,  \
  57                                                   char *buf)                  \
  58 {                                                                             \
  59         return sprintf(buf,"%d\n", (unsigned int)                             \
  60                        ZFCP_GET_LOG_VALUE(ZFCP_LOG_AREA_##_define));          \
  61 }                                                                             \
  62                                                                               \
  63 static DRIVER_ATTR(loglevel_##_name, S_IWUSR | S_IRUGO,                       \
  64                    zfcp_sysfs_loglevel_##_name##_show,                        \
  65                    zfcp_sysfs_loglevel_##_name##_store);
  66
  67 ZFCP_DEFINE_DRIVER_ATTR(other, OTHER);
  68 ZFCP_DEFINE_DRIVER_ATTR(scsi, SCSI);
  69 ZFCP_DEFINE_DRIVER_ATTR(fsf, FSF);
  70 ZFCP_DEFINE_DRIVER_ATTR(config, CONFIG);
  71 ZFCP_DEFINE_DRIVER_ATTR(cio, CIO);
  72 ZFCP_DEFINE_DRIVER_ATTR(qdio, QDIO);
  73 ZFCP_DEFINE_DRIVER_ATTR(erp, ERP);
  74 ZFCP_DEFINE_DRIVER_ATTR(fc, FC);
  75
  76 static ssize_t zfcp_sysfs_version_show(struct device_driver *dev,
  77                                               char *buf)
  78 {
  79         return sprintf(buf, "%s\n", zfcp_data.driver_version);
  80 }
  81
  82 static DRIVER_ATTR(version, S_IRUGO, zfcp_sysfs_version_show, NULL);
  83
  84 static struct attribute *zfcp_driver_attrs[] = {
  85         &driver_attr_loglevel_other.attr,
  86         &driver_attr_loglevel_scsi.attr,
  87         &driver_attr_loglevel_fsf.attr,
  88         &driver_attr_loglevel_config.attr,
  89         &driver_attr_loglevel_cio.attr,
  90         &driver_attr_loglevel_qdio.attr,
  91         &driver_attr_loglevel_erp.attr,
  92         &driver_attr_loglevel_fc.attr,
  93         &driver_attr_version.attr,
  94         NULL
  95 };
  96
  97 static struct attribute_group zfcp_driver_attr_group = {
  98         .attrs = zfcp_driver_attrs,
  99 };
 100
 101 /**
 102  * zfcp_sysfs_create_driver_files - create sysfs driver files
 103  * @dev: pointer to belonging device
 104  *
 105  * Create all sysfs attributes of the zfcp device driver
 106  */
 107 int
 108 zfcp_sysfs_driver_create_files(struct device_driver *drv)
 109 {
 110         return sysfs_create_group(&drv->kobj, &zfcp_driver_attr_group);
 111 }
 112
 113 /**
 114  * zfcp_sysfs_remove_driver_files - remove sysfs driver files
 115  * @dev: pointer to belonging device
 116  *
 117  * Remove all sysfs attributes of the zfcp device driver
 118  */
 119 void
 120 zfcp_sysfs_driver_remove_files(struct device_driver *drv)
 121 {
 122         sysfs_remove_group(&drv->kobj, &zfcp_driver_attr_group);
 123 }
 124
 125 #undef ZFCP_LOG_AREA