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