rt2x00: correct "skb_buff" typo
[linux-2.6] / drivers / acpi / system.c
1 /*
2  *  acpi_system.c - ACPI System Driver ($Revision: 63 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  */
25
26 #include <linux/proc_fs.h>
27 #include <linux/seq_file.h>
28 #include <linux/init.h>
29 #include <asm/uaccess.h>
30
31 #include <acpi/acpi_drivers.h>
32
33 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
34 ACPI_MODULE_NAME("system");
35 #ifdef MODULE_PARAM_PREFIX
36 #undef MODULE_PARAM_PREFIX
37 #endif
38 #define MODULE_PARAM_PREFIX "acpi."
39
40 #define ACPI_SYSTEM_CLASS               "system"
41 #define ACPI_SYSTEM_DEVICE_NAME         "System"
42
43 /*
44  * Make ACPICA version work as module param
45  */
46 static int param_get_acpica_version(char *buffer, struct kernel_param *kp)
47 {
48         int result;
49
50         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
51
52         return result;
53 }
54
55 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
56
57 /* --------------------------------------------------------------------------
58                               FS Interface (/sys)
59    -------------------------------------------------------------------------- */
60 static LIST_HEAD(acpi_table_attr_list);
61 static struct kobject *tables_kobj;
62
63 struct acpi_table_attr {
64         struct bin_attribute attr;
65         char name[8];
66         int instance;
67         struct list_head node;
68 };
69
70 static ssize_t acpi_table_show(struct kobject *kobj,
71                                struct bin_attribute *bin_attr, char *buf,
72                                loff_t offset, size_t count)
73 {
74         struct acpi_table_attr *table_attr =
75             container_of(bin_attr, struct acpi_table_attr, attr);
76         struct acpi_table_header *table_header = NULL;
77         acpi_status status;
78         ssize_t ret_count = count;
79
80         status =
81             acpi_get_table(table_attr->name, table_attr->instance,
82                            &table_header);
83         if (ACPI_FAILURE(status))
84                 return -ENODEV;
85
86         if (offset >= table_header->length) {
87                 ret_count = 0;
88                 goto end;
89         }
90
91         if (offset + ret_count > table_header->length)
92                 ret_count = table_header->length - offset;
93
94         memcpy(buf, ((char *)table_header) + offset, ret_count);
95
96       end:
97         return ret_count;
98 }
99
100 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
101                                  struct acpi_table_header *table_header)
102 {
103         struct acpi_table_header *header = NULL;
104         struct acpi_table_attr *attr = NULL;
105
106         memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE);
107
108         list_for_each_entry(attr, &acpi_table_attr_list, node) {
109                 if (!memcmp(table_header->signature, attr->name,
110                             ACPI_NAME_SIZE))
111                         if (table_attr->instance < attr->instance)
112                                 table_attr->instance = attr->instance;
113         }
114         table_attr->instance++;
115
116         if (table_attr->instance > 1 || (table_attr->instance == 1 &&
117                                          !acpi_get_table(table_header->
118                                                          signature, 2,
119                                                          &header)))
120                 sprintf(table_attr->name + 4, "%d", table_attr->instance);
121
122         table_attr->attr.size = 0;
123         table_attr->attr.read = acpi_table_show;
124         table_attr->attr.attr.name = table_attr->name;
125         table_attr->attr.attr.mode = 0444;
126         table_attr->attr.attr.owner = THIS_MODULE;
127
128         return;
129 }
130
131 static int acpi_system_sysfs_init(void)
132 {
133         struct acpi_table_attr *table_attr;
134         struct acpi_table_header *table_header = NULL;
135         int table_index = 0;
136         int result;
137
138         tables_kobj = kobject_create_and_add("tables", acpi_kobj);
139         if (!tables_kobj)
140                 return -ENOMEM;
141
142         do {
143                 result = acpi_get_table_by_index(table_index, &table_header);
144                 if (!result) {
145                         table_index++;
146                         table_attr = NULL;
147                         table_attr =
148                             kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL);
149                         if (!table_attr)
150                                 return -ENOMEM;
151
152                         acpi_table_attr_init(table_attr, table_header);
153                         result =
154                             sysfs_create_bin_file(tables_kobj,
155                                                   &table_attr->attr);
156                         if (result) {
157                                 kfree(table_attr);
158                                 return result;
159                         } else
160                                 list_add_tail(&table_attr->node,
161                                               &acpi_table_attr_list);
162                 }
163         } while (!result);
164         kobject_uevent(tables_kobj, KOBJ_ADD);
165
166         return 0;
167 }
168
169 /* --------------------------------------------------------------------------
170                               FS Interface (/proc)
171    -------------------------------------------------------------------------- */
172 #ifdef CONFIG_ACPI_PROCFS
173 #define ACPI_SYSTEM_FILE_INFO           "info"
174 #define ACPI_SYSTEM_FILE_EVENT          "event"
175 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
176 #define ACPI_SYSTEM_FILE_FADT           "fadt"
177
178 static int acpi_system_read_info(struct seq_file *seq, void *offset)
179 {
180
181         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
182         return 0;
183 }
184
185 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
186 {
187         return single_open(file, acpi_system_read_info, PDE(inode)->data);
188 }
189
190 static const struct file_operations acpi_system_info_ops = {
191         .open = acpi_system_info_open_fs,
192         .read = seq_read,
193         .llseek = seq_lseek,
194         .release = single_release,
195 };
196
197 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
198                                      loff_t *);
199
200 static const struct file_operations acpi_system_dsdt_ops = {
201         .read = acpi_system_read_dsdt,
202 };
203
204 static ssize_t
205 acpi_system_read_dsdt(struct file *file,
206                       char __user * buffer, size_t count, loff_t * ppos)
207 {
208         acpi_status status = AE_OK;
209         struct acpi_table_header *dsdt = NULL;
210         ssize_t res;
211
212         status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
213         if (ACPI_FAILURE(status))
214                 return -ENODEV;
215
216         res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length);
217
218         return res;
219 }
220
221 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
222                                      loff_t *);
223
224 static const struct file_operations acpi_system_fadt_ops = {
225         .read = acpi_system_read_fadt,
226 };
227
228 static ssize_t
229 acpi_system_read_fadt(struct file *file,
230                       char __user * buffer, size_t count, loff_t * ppos)
231 {
232         acpi_status status = AE_OK;
233         struct acpi_table_header *fadt = NULL;
234         ssize_t res;
235
236         status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
237         if (ACPI_FAILURE(status))
238                 return -ENODEV;
239
240         res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length);
241
242         return res;
243 }
244
245 static int acpi_system_procfs_init(void)
246 {
247         struct proc_dir_entry *entry;
248         int error = 0;
249         char *name;
250
251         /* 'info' [R] */
252         name = ACPI_SYSTEM_FILE_INFO;
253         entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
254         if (!entry)
255                 goto Error;
256         else {
257                 entry->proc_fops = &acpi_system_info_ops;
258         }
259
260         /* 'dsdt' [R] */
261         name = ACPI_SYSTEM_FILE_DSDT;
262         entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
263         if (entry)
264                 entry->proc_fops = &acpi_system_dsdt_ops;
265         else
266                 goto Error;
267
268         /* 'fadt' [R] */
269         name = ACPI_SYSTEM_FILE_FADT;
270         entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
271         if (entry)
272                 entry->proc_fops = &acpi_system_fadt_ops;
273         else
274                 goto Error;
275
276       Done:
277         return error;
278
279       Error:
280         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
281         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
282         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
283
284         error = -EFAULT;
285         goto Done;
286 }
287 #else
288 static int acpi_system_procfs_init(void)
289 {
290         return 0;
291 }
292 #endif
293
294 static int __init acpi_system_init(void)
295 {
296         int result = 0;
297
298         if (acpi_disabled)
299                 return 0;
300
301         result = acpi_system_procfs_init();
302         if (result)
303                 return result;
304
305         result = acpi_system_sysfs_init();
306
307         return result;
308 }
309
310 subsys_initcall(acpi_system_init);