2678098d450465fd3a3989fca0eb41008842dbe5
[linux-2.6.git] / drivers / firmware / dmi-id.c
1 /*
2  * Export SMBIOS/DMI info via sysfs to userspace
3  *
4  * Copyright 2007, Lennart Poettering
5  *
6  * Licensed under GPLv2
7  */
8
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/dmi.h>
13 #include <linux/device.h>
14 #include <linux/autoconf.h>
15
16 #define DEFINE_DMI_ATTR(_name, _mode, _show)            \
17 static struct device_attribute sys_dmi_##_name##_attr = \
18         __ATTR(_name, _mode, _show, NULL);
19
20 #define DEFINE_DMI_ATTR_WITH_SHOW(_name, _mode, _field)                 \
21 static ssize_t sys_dmi_##_name##_show(struct device *dev,               \
22                                       struct device_attribute *attr,    \
23                                       char *page)                       \
24 {                                                                       \
25         ssize_t len;                                                    \
26         len = scnprintf(page, PAGE_SIZE, "%s\n", dmi_get_system_info(_field)); \
27         page[len-1] = '\n';                                             \
28         return len;                                                     \
29 }                                                                       \
30 DEFINE_DMI_ATTR(_name, _mode, sys_dmi_##_name##_show);
31
32 DEFINE_DMI_ATTR_WITH_SHOW(bios_vendor,          0444, DMI_BIOS_VENDOR);
33 DEFINE_DMI_ATTR_WITH_SHOW(bios_version,         0444, DMI_BIOS_VERSION);
34 DEFINE_DMI_ATTR_WITH_SHOW(bios_date,            0444, DMI_BIOS_DATE);
35 DEFINE_DMI_ATTR_WITH_SHOW(sys_vendor,           0444, DMI_SYS_VENDOR);
36 DEFINE_DMI_ATTR_WITH_SHOW(product_name,         0444, DMI_PRODUCT_NAME);
37 DEFINE_DMI_ATTR_WITH_SHOW(product_version,      0444, DMI_PRODUCT_VERSION);
38 DEFINE_DMI_ATTR_WITH_SHOW(product_serial,       0400, DMI_PRODUCT_SERIAL);
39 DEFINE_DMI_ATTR_WITH_SHOW(product_uuid,         0400, DMI_PRODUCT_UUID);
40 DEFINE_DMI_ATTR_WITH_SHOW(board_vendor,         0444, DMI_BOARD_VENDOR);
41 DEFINE_DMI_ATTR_WITH_SHOW(board_name,           0444, DMI_BOARD_NAME);
42 DEFINE_DMI_ATTR_WITH_SHOW(board_version,        0444, DMI_BOARD_VERSION);
43 DEFINE_DMI_ATTR_WITH_SHOW(board_serial,         0400, DMI_BOARD_SERIAL);
44 DEFINE_DMI_ATTR_WITH_SHOW(board_asset_tag,      0444, DMI_BOARD_ASSET_TAG);
45 DEFINE_DMI_ATTR_WITH_SHOW(chassis_vendor,       0444, DMI_CHASSIS_VENDOR);
46 DEFINE_DMI_ATTR_WITH_SHOW(chassis_type,         0444, DMI_CHASSIS_TYPE);
47 DEFINE_DMI_ATTR_WITH_SHOW(chassis_version,      0444, DMI_CHASSIS_VERSION);
48 DEFINE_DMI_ATTR_WITH_SHOW(chassis_serial,       0400, DMI_CHASSIS_SERIAL);
49 DEFINE_DMI_ATTR_WITH_SHOW(chassis_asset_tag,    0444, DMI_CHASSIS_ASSET_TAG);
50
51 static void ascii_filter(char *d, const char *s)
52 {
53         /* Filter out characters we don't want to see in the modalias string */
54         for (; *s; s++)
55                 if (*s > ' ' && *s < 127 && *s != ':')
56                         *(d++) = *s;
57
58         *d = 0;
59 }
60
61 static ssize_t get_modalias(char *buffer, size_t buffer_size)
62 {
63         static const struct mafield {
64                 const char *prefix;
65                 int field;
66         } fields[] = {
67                 { "bvn", DMI_BIOS_VENDOR },
68                 { "bvr", DMI_BIOS_VERSION },
69                 { "bd",  DMI_BIOS_DATE },
70                 { "svn", DMI_SYS_VENDOR },
71                 { "pn",  DMI_PRODUCT_NAME },
72                 { "pvr", DMI_PRODUCT_VERSION },
73                 { "rvn", DMI_BOARD_VENDOR },
74                 { "rn",  DMI_BOARD_NAME },
75                 { "rvr", DMI_BOARD_VERSION },
76                 { "cvn", DMI_CHASSIS_VENDOR },
77                 { "ct",  DMI_CHASSIS_TYPE },
78                 { "cvr", DMI_CHASSIS_VERSION },
79                 { NULL,  DMI_NONE }
80         };
81
82         ssize_t l, left;
83         char *p;
84         const struct mafield *f;
85
86         strcpy(buffer, "dmi");
87         p = buffer + 3; left = buffer_size - 4;
88
89         for (f = fields; f->prefix && left > 0; f++) {
90                 const char *c;
91                 char *t;
92
93                 c = dmi_get_system_info(f->field);
94                 if (!c)
95                         continue;
96
97                 t = kmalloc(strlen(c) + 1, GFP_KERNEL);
98                 if (!t)
99                         break;
100                 ascii_filter(t, c);
101                 l = scnprintf(p, left, ":%s%s", f->prefix, t);
102                 kfree(t);
103
104                 p += l;
105                 left -= l;
106         }
107
108         p[0] = ':';
109         p[1] = 0;
110
111         return p - buffer + 1;
112 }
113
114 static ssize_t sys_dmi_modalias_show(struct device *dev,
115                                      struct device_attribute *attr, char *page)
116 {
117         ssize_t r;
118         r = get_modalias(page, PAGE_SIZE-1);
119         page[r] = '\n';
120         page[r+1] = 0;
121         return r+1;
122 }
123
124 DEFINE_DMI_ATTR(modalias, 0444, sys_dmi_modalias_show);
125
126 static struct attribute *sys_dmi_attributes[DMI_STRING_MAX+2];
127
128 static struct attribute_group sys_dmi_attribute_group = {
129         .attrs = sys_dmi_attributes,
130 };
131
132 static struct attribute_group* sys_dmi_attribute_groups[] = {
133         &sys_dmi_attribute_group,
134         NULL
135 };
136
137 static int dmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
138 {
139         ssize_t len;
140
141         if (add_uevent_var(env, "MODALIAS="))
142                 return -ENOMEM;
143         len = get_modalias(&env->buf[env->buflen - 1],
144                            sizeof(env->buf) - env->buflen);
145         if (len >= (sizeof(env->buf) - env->buflen))
146                 return -ENOMEM;
147         env->buflen += len;
148         return 0;
149 }
150
151 static struct class dmi_class = {
152         .name = "dmi",
153         .dev_release = (void(*)(struct device *)) kfree,
154         .dev_uevent = dmi_dev_uevent,
155 };
156
157 static struct device *dmi_dev;
158
159 /* Initialization */
160
161 #define ADD_DMI_ATTR(_name, _field) \
162         if (dmi_get_system_info(_field)) \
163                 sys_dmi_attributes[i++] = & sys_dmi_##_name##_attr.attr;
164
165 extern int dmi_available;
166
167 static int __init dmi_id_init(void)
168 {
169         int ret, i;
170
171         if (!dmi_available)
172                 return -ENODEV;
173
174         /* Not necessarily all DMI fields are available on all
175          * systems, hence let's built an attribute table of just
176          * what's available */
177         i = 0;
178         ADD_DMI_ATTR(bios_vendor,       DMI_BIOS_VENDOR);
179         ADD_DMI_ATTR(bios_version,      DMI_BIOS_VERSION);
180         ADD_DMI_ATTR(bios_date,         DMI_BIOS_DATE);
181         ADD_DMI_ATTR(sys_vendor,        DMI_SYS_VENDOR);
182         ADD_DMI_ATTR(product_name,      DMI_PRODUCT_NAME);
183         ADD_DMI_ATTR(product_version,   DMI_PRODUCT_VERSION);
184         ADD_DMI_ATTR(product_serial,    DMI_PRODUCT_SERIAL);
185         ADD_DMI_ATTR(product_uuid,      DMI_PRODUCT_UUID);
186         ADD_DMI_ATTR(board_vendor,      DMI_BOARD_VENDOR);
187         ADD_DMI_ATTR(board_name,        DMI_BOARD_NAME);
188         ADD_DMI_ATTR(board_version,     DMI_BOARD_VERSION);
189         ADD_DMI_ATTR(board_serial,      DMI_BOARD_SERIAL);
190         ADD_DMI_ATTR(board_asset_tag,   DMI_BOARD_ASSET_TAG);
191         ADD_DMI_ATTR(chassis_vendor,    DMI_CHASSIS_VENDOR);
192         ADD_DMI_ATTR(chassis_type,      DMI_CHASSIS_TYPE);
193         ADD_DMI_ATTR(chassis_version,   DMI_CHASSIS_VERSION);
194         ADD_DMI_ATTR(chassis_serial,    DMI_CHASSIS_SERIAL);
195         ADD_DMI_ATTR(chassis_asset_tag, DMI_CHASSIS_ASSET_TAG);
196         sys_dmi_attributes[i++] = &sys_dmi_modalias_attr.attr;
197
198         ret = class_register(&dmi_class);
199         if (ret)
200                 return ret;
201
202         dmi_dev = kzalloc(sizeof(*dmi_dev), GFP_KERNEL);
203         if (!dmi_dev) {
204                 ret = -ENOMEM;
205                 goto fail_class_unregister;
206         }
207
208         dmi_dev->class = &dmi_class;
209         strcpy(dmi_dev->bus_id, "id");
210         dmi_dev->groups = sys_dmi_attribute_groups;
211
212         ret = device_register(dmi_dev);
213         if (ret)
214                 goto fail_class_unregister;
215
216         return 0;
217
218 fail_class_unregister:
219
220         class_unregister(&dmi_class);
221
222         return ret;
223 }
224
225 arch_initcall(dmi_id_init);