Linux kernel mirror (for testing)
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linux
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
34ACPI_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#define ACPI_SYSTEM_FILE_INFO "info"
43#define ACPI_SYSTEM_FILE_EVENT "event"
44#define ACPI_SYSTEM_FILE_DSDT "dsdt"
45#define ACPI_SYSTEM_FILE_FADT "fadt"
46
47/*
48 * Make ACPICA version work as module param
49 */
50static int param_get_acpica_version(char *buffer, struct kernel_param *kp) {
51 int result;
52
53 result = sprintf(buffer, "%x", ACPI_CA_VERSION);
54
55 return result;
56}
57
58module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
59
60/* --------------------------------------------------------------------------
61 FS Interface (/proc)
62 -------------------------------------------------------------------------- */
63#ifdef CONFIG_ACPI_PROCFS
64
65static int acpi_system_read_info(struct seq_file *seq, void *offset)
66{
67
68 seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
69 return 0;
70}
71
72static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
73{
74 return single_open(file, acpi_system_read_info, PDE(inode)->data);
75}
76
77static const struct file_operations acpi_system_info_ops = {
78 .open = acpi_system_info_open_fs,
79 .read = seq_read,
80 .llseek = seq_lseek,
81 .release = single_release,
82};
83#endif
84
85static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
86 loff_t *);
87
88static const struct file_operations acpi_system_dsdt_ops = {
89 .read = acpi_system_read_dsdt,
90};
91
92static ssize_t
93acpi_system_read_dsdt(struct file *file,
94 char __user * buffer, size_t count, loff_t * ppos)
95{
96 acpi_status status = AE_OK;
97 struct acpi_table_header *dsdt = NULL;
98 ssize_t res;
99
100
101 status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
102 if (ACPI_FAILURE(status))
103 return -ENODEV;
104
105 res = simple_read_from_buffer(buffer, count, ppos,
106 dsdt, dsdt->length);
107
108 return res;
109}
110
111static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
112 loff_t *);
113
114static const struct file_operations acpi_system_fadt_ops = {
115 .read = acpi_system_read_fadt,
116};
117
118static ssize_t
119acpi_system_read_fadt(struct file *file,
120 char __user * buffer, size_t count, loff_t * ppos)
121{
122 acpi_status status = AE_OK;
123 struct acpi_table_header *fadt = NULL;
124 ssize_t res;
125
126
127 status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
128 if (ACPI_FAILURE(status))
129 return -ENODEV;
130
131 res = simple_read_from_buffer(buffer, count, ppos,
132 fadt, fadt->length);
133
134 return res;
135}
136
137static int __init acpi_system_init(void)
138{
139 struct proc_dir_entry *entry;
140 int error = 0;
141 char *name;
142
143
144 if (acpi_disabled)
145 return 0;
146
147#ifdef CONFIG_ACPI_PROCFS
148 /* 'info' [R] */
149 name = ACPI_SYSTEM_FILE_INFO;
150 entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
151 if (!entry)
152 goto Error;
153 else {
154 entry->proc_fops = &acpi_system_info_ops;
155 }
156#endif
157
158 /* 'dsdt' [R] */
159 name = ACPI_SYSTEM_FILE_DSDT;
160 entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
161 if (entry)
162 entry->proc_fops = &acpi_system_dsdt_ops;
163 else
164 goto Error;
165
166 /* 'fadt' [R] */
167 name = ACPI_SYSTEM_FILE_FADT;
168 entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
169 if (entry)
170 entry->proc_fops = &acpi_system_fadt_ops;
171 else
172 goto Error;
173
174 Done:
175 return error;
176
177 Error:
178 remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
179 remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
180#ifdef CONFIG_ACPI_PROCFS
181 remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
182#endif
183
184 error = -EFAULT;
185 goto Done;
186}
187
188subsys_initcall(acpi_system_init);