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("acpi_system")
35#define ACPI_SYSTEM_CLASS "system"
36#define ACPI_SYSTEM_DRIVER_NAME "ACPI System Driver"
37#define ACPI_SYSTEM_DEVICE_NAME "System"
38#define ACPI_SYSTEM_FILE_INFO "info"
39#define ACPI_SYSTEM_FILE_EVENT "event"
40#define ACPI_SYSTEM_FILE_DSDT "dsdt"
41#define ACPI_SYSTEM_FILE_FADT "fadt"
42extern FADT_DESCRIPTOR acpi_fadt;
43
44/* --------------------------------------------------------------------------
45 FS Interface (/proc)
46 -------------------------------------------------------------------------- */
47
48static int acpi_system_read_info(struct seq_file *seq, void *offset)
49{
50 ACPI_FUNCTION_TRACE("acpi_system_read_info");
51
52 seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
53 return_VALUE(0);
54}
55
56static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
57{
58 return single_open(file, acpi_system_read_info, PDE(inode)->data);
59}
60
61static struct file_operations acpi_system_info_ops = {
62 .open = acpi_system_info_open_fs,
63 .read = seq_read,
64 .llseek = seq_lseek,
65 .release = single_release,
66};
67
68static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
69 loff_t *);
70
71static struct file_operations acpi_system_dsdt_ops = {
72 .read = acpi_system_read_dsdt,
73};
74
75static ssize_t
76acpi_system_read_dsdt(struct file *file,
77 char __user * buffer, size_t count, loff_t * ppos)
78{
79 acpi_status status = AE_OK;
80 struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
81 ssize_t res;
82
83 ACPI_FUNCTION_TRACE("acpi_system_read_dsdt");
84
85 status = acpi_get_table(ACPI_TABLE_DSDT, 1, &dsdt);
86 if (ACPI_FAILURE(status))
87 return_VALUE(-ENODEV);
88
89 res = simple_read_from_buffer(buffer, count, ppos,
90 dsdt.pointer, dsdt.length);
91 acpi_os_free(dsdt.pointer);
92
93 return_VALUE(res);
94}
95
96static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
97 loff_t *);
98
99static struct file_operations acpi_system_fadt_ops = {
100 .read = acpi_system_read_fadt,
101};
102
103static ssize_t
104acpi_system_read_fadt(struct file *file,
105 char __user * buffer, size_t count, loff_t * ppos)
106{
107 acpi_status status = AE_OK;
108 struct acpi_buffer fadt = { ACPI_ALLOCATE_BUFFER, NULL };
109 ssize_t res;
110
111 ACPI_FUNCTION_TRACE("acpi_system_read_fadt");
112
113 status = acpi_get_table(ACPI_TABLE_FADT, 1, &fadt);
114 if (ACPI_FAILURE(status))
115 return_VALUE(-ENODEV);
116
117 res = simple_read_from_buffer(buffer, count, ppos,
118 fadt.pointer, fadt.length);
119 acpi_os_free(fadt.pointer);
120
121 return_VALUE(res);
122}
123
124static int __init acpi_system_init(void)
125{
126 struct proc_dir_entry *entry;
127 int error = 0;
128 char *name;
129
130 ACPI_FUNCTION_TRACE("acpi_system_init");
131
132 if (acpi_disabled)
133 return_VALUE(0);
134
135 /* 'info' [R] */
136 name = ACPI_SYSTEM_FILE_INFO;
137 entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
138 if (!entry)
139 goto Error;
140 else {
141 entry->proc_fops = &acpi_system_info_ops;
142 }
143
144 /* 'dsdt' [R] */
145 name = ACPI_SYSTEM_FILE_DSDT;
146 entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
147 if (entry)
148 entry->proc_fops = &acpi_system_dsdt_ops;
149 else
150 goto Error;
151
152 /* 'fadt' [R] */
153 name = ACPI_SYSTEM_FILE_FADT;
154 entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
155 if (entry)
156 entry->proc_fops = &acpi_system_fadt_ops;
157 else
158 goto Error;
159
160 Done:
161 return_VALUE(error);
162
163 Error:
164 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
165 "Unable to create '%s' proc fs entry\n", name));
166
167 remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
168 remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
169 remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
170
171 error = -EFAULT;
172 goto Done;
173}
174
175subsys_initcall(acpi_system_init);