[PATCH] Driver Core: drivers/s390/net/qeth_sys.c - drivers/usb/gadget/pxa2xx_udc...
[linux-2.6.git] / drivers / s390 / scsi / zfcp_sysfs_unit.c
1 /*
2  * linux/drivers/s390/scsi/zfcp_sysfs_unit.c
3  *
4  * FCP adapter driver for IBM eServer zSeries
5  *
6  * sysfs unit 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  *      Volker Sameske <sameske@de.ibm.com>
15  *
16  * This program is free software; you can redistribute it and/or modify
17  * it under the terms of the GNU General Public License as published by
18  * the Free Software Foundation; either version 2, or (at your option)
19  * any later version.
20  *
21  * This program is distributed in the hope that it will be useful,
22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24  * GNU General Public License for more details.
25  *
26  * You should have received a copy of the GNU General Public License
27  * along with this program; if not, write to the Free Software
28  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29  */
30
31 #define ZFCP_SYSFS_UNIT_C_REVISION "$Revision: 1.30 $"
32
33 #include "zfcp_ext.h"
34
35 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
36
37 /**
38  * zfcp_sysfs_unit_release - gets called when a struct device unit is released
39  * @dev: pointer to belonging device
40  */
41 void
42 zfcp_sysfs_unit_release(struct device *dev)
43 {
44         kfree(dev);
45 }
46
47 /**
48  * ZFCP_DEFINE_UNIT_ATTR
49  * @_name:   name of show attribute
50  * @_format: format string
51  * @_value:  value to print
52  *
53  * Generates attribute for a unit.
54  */
55 #define ZFCP_DEFINE_UNIT_ATTR(_name, _format, _value)                    \
56 static ssize_t zfcp_sysfs_unit_##_name##_show(struct device *dev, struct device_attribute *attr,        \
57                                               char *buf)                 \
58 {                                                                        \
59         struct zfcp_unit *unit;                                          \
60                                                                          \
61         unit = dev_get_drvdata(dev);                                     \
62         return sprintf(buf, _format, _value);                            \
63 }                                                                        \
64                                                                          \
65 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_unit_##_name##_show, NULL);
66
67 ZFCP_DEFINE_UNIT_ATTR(status, "0x%08x\n", atomic_read(&unit->status));
68 ZFCP_DEFINE_UNIT_ATTR(scsi_lun, "0x%x\n", unit->scsi_lun);
69 ZFCP_DEFINE_UNIT_ATTR(in_recovery, "%d\n", atomic_test_mask
70                       (ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status));
71 ZFCP_DEFINE_UNIT_ATTR(access_denied, "%d\n", atomic_test_mask
72                       (ZFCP_STATUS_COMMON_ACCESS_DENIED, &unit->status));
73 ZFCP_DEFINE_UNIT_ATTR(access_shared, "%d\n", atomic_test_mask
74                       (ZFCP_STATUS_UNIT_SHARED, &unit->status));
75 ZFCP_DEFINE_UNIT_ATTR(access_readonly, "%d\n", atomic_test_mask
76                       (ZFCP_STATUS_UNIT_READONLY, &unit->status));
77
78 /**
79  * zfcp_sysfs_unit_failed_store - failed state of unit
80  * @dev: pointer to belonging device
81  * @buf: pointer to input buffer
82  * @count: number of bytes in buffer
83  *
84  * Store function of the "failed" attribute of a unit.
85  * If a "0" gets written to "failed", error recovery will be
86  * started for the belonging unit.
87  */
88 static ssize_t
89 zfcp_sysfs_unit_failed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
90 {
91         struct zfcp_unit *unit;
92         unsigned int val;
93         char *endp;
94         int retval = 0;
95
96         down(&zfcp_data.config_sema);
97         unit = dev_get_drvdata(dev);
98         if (atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status)) {
99                 retval = -EBUSY;
100                 goto out;
101         }
102
103         val = simple_strtoul(buf, &endp, 0);
104         if (((endp + 1) < (buf + count)) || (val != 0)) {
105                 retval = -EINVAL;
106                 goto out;
107         }
108
109         zfcp_erp_modify_unit_status(unit, ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
110         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED);
111         zfcp_erp_wait(unit->port->adapter);
112  out:
113         up(&zfcp_data.config_sema);
114         return retval ? retval : (ssize_t) count;
115 }
116
117 /**
118  * zfcp_sysfs_unit_failed_show - failed state of unit
119  * @dev: pointer to belonging device
120  * @buf: pointer to input buffer
121  *
122  * Show function of "failed" attribute of unit. Will be
123  * "0" if unit is working, otherwise "1".
124  */
125 static ssize_t
126 zfcp_sysfs_unit_failed_show(struct device *dev, struct device_attribute *attr, char *buf)
127 {
128         struct zfcp_unit *unit;
129
130         unit = dev_get_drvdata(dev);
131         if (atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status))
132                 return sprintf(buf, "1\n");
133         else
134                 return sprintf(buf, "0\n");
135 }
136
137 static DEVICE_ATTR(failed, S_IWUSR | S_IRUGO, zfcp_sysfs_unit_failed_show,
138                    zfcp_sysfs_unit_failed_store);
139
140 static struct attribute *zfcp_unit_attrs[] = {
141         &dev_attr_scsi_lun.attr,
142         &dev_attr_failed.attr,
143         &dev_attr_in_recovery.attr,
144         &dev_attr_status.attr,
145         &dev_attr_access_denied.attr,
146         &dev_attr_access_shared.attr,
147         &dev_attr_access_readonly.attr,
148         NULL
149 };
150
151 static struct attribute_group zfcp_unit_attr_group = {
152         .attrs = zfcp_unit_attrs,
153 };
154
155 /** 
156  * zfcp_sysfs_create_unit_files - create sysfs unit files
157  * @dev: pointer to belonging device
158  *
159  * Create all attributes of the sysfs representation of a unit.
160  */
161 int
162 zfcp_sysfs_unit_create_files(struct device *dev)
163 {
164         return sysfs_create_group(&dev->kobj, &zfcp_unit_attr_group);
165 }
166
167 /** 
168  * zfcp_sysfs_remove_unit_files - remove sysfs unit files
169  * @dev: pointer to belonging device
170  *
171  * Remove all attributes of the sysfs representation of a unit.
172  */
173 void
174 zfcp_sysfs_unit_remove_files(struct device *dev)
175 {
176         sysfs_remove_group(&dev->kobj, &zfcp_unit_attr_group);
177 }
178
179 #undef ZFCP_LOG_AREA