Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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
34#define _COMPONENT ACPI_SYSTEM_COMPONENT
35ACPI_MODULE_NAME ("acpi_system")
36
37#define ACPI_SYSTEM_CLASS "system"
38#define ACPI_SYSTEM_DRIVER_NAME "ACPI System Driver"
39#define ACPI_SYSTEM_DEVICE_NAME "System"
40#define ACPI_SYSTEM_FILE_INFO "info"
41#define ACPI_SYSTEM_FILE_EVENT "event"
42#define ACPI_SYSTEM_FILE_DSDT "dsdt"
43#define ACPI_SYSTEM_FILE_FADT "fadt"
44
45extern FADT_DESCRIPTOR acpi_fadt;
46
47/* --------------------------------------------------------------------------
48 FS Interface (/proc)
49 -------------------------------------------------------------------------- */
50
51static int
52acpi_system_read_info (struct seq_file *seq, void *offset)
53{
54 ACPI_FUNCTION_TRACE("acpi_system_read_info");
55
56 seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
57 return_VALUE(0);
58}
59
60static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
61{
62 return single_open(file, acpi_system_read_info, PDE(inode)->data);
63}
64
65static struct file_operations acpi_system_info_ops = {
66 .open = acpi_system_info_open_fs,
67 .read = seq_read,
68 .llseek = seq_lseek,
69 .release = single_release,
70};
71
72static ssize_t acpi_system_read_dsdt (struct file*, char __user *, size_t, loff_t*);
73
74static struct file_operations acpi_system_dsdt_ops = {
75 .read = acpi_system_read_dsdt,
76};
77
78static ssize_t
79acpi_system_read_dsdt (
80 struct file *file,
81 char __user *buffer,
82 size_t count,
83 loff_t *ppos)
84{
85 acpi_status status = AE_OK;
86 struct acpi_buffer dsdt = {ACPI_ALLOCATE_BUFFER, NULL};
87 ssize_t res;
88
89 ACPI_FUNCTION_TRACE("acpi_system_read_dsdt");
90
91 status = acpi_get_table(ACPI_TABLE_DSDT, 1, &dsdt);
92 if (ACPI_FAILURE(status))
93 return_VALUE(-ENODEV);
94
95 res = simple_read_from_buffer(buffer, count, ppos,
96 dsdt.pointer, dsdt.length);
97 acpi_os_free(dsdt.pointer);
98
99 return_VALUE(res);
100}
101
102
103static ssize_t acpi_system_read_fadt (struct file*, char __user *, size_t, loff_t*);
104
105static struct file_operations acpi_system_fadt_ops = {
106 .read = acpi_system_read_fadt,
107};
108
109static ssize_t
110acpi_system_read_fadt (
111 struct file *file,
112 char __user *buffer,
113 size_t count,
114 loff_t *ppos)
115{
116 acpi_status status = AE_OK;
117 struct acpi_buffer fadt = {ACPI_ALLOCATE_BUFFER, NULL};
118 ssize_t res;
119
120 ACPI_FUNCTION_TRACE("acpi_system_read_fadt");
121
122 status = acpi_get_table(ACPI_TABLE_FADT, 1, &fadt);
123 if (ACPI_FAILURE(status))
124 return_VALUE(-ENODEV);
125
126 res = simple_read_from_buffer(buffer, count, ppos,
127 fadt.pointer, fadt.length);
128 acpi_os_free(fadt.pointer);
129
130 return_VALUE(res);
131}
132
133
134static int __init acpi_system_init (void)
135{
136 struct proc_dir_entry *entry;
137 int error = 0;
138 char * name;
139
140 ACPI_FUNCTION_TRACE("acpi_system_init");
141
142 if (acpi_disabled)
143 return_VALUE(0);
144
145 /* 'info' [R] */
146 name = ACPI_SYSTEM_FILE_INFO;
147 entry = create_proc_entry(name,
148 S_IRUGO, acpi_root_dir);
149 if (!entry)
150 goto Error;
151 else {
152 entry->proc_fops = &acpi_system_info_ops;
153 }
154
155 /* 'dsdt' [R] */
156 name = ACPI_SYSTEM_FILE_DSDT;
157 entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
158 if (entry)
159 entry->proc_fops = &acpi_system_dsdt_ops;
160 else
161 goto Error;
162
163 /* 'fadt' [R] */
164 name = ACPI_SYSTEM_FILE_FADT;
165 entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
166 if (entry)
167 entry->proc_fops = &acpi_system_fadt_ops;
168 else
169 goto Error;
170
171 Done:
172 return_VALUE(error);
173
174 Error:
175 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
176 "Unable to create '%s' proc fs entry\n", name));
177
178 remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
179 remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
180 remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
181
182 error = -EFAULT;
183 goto Done;
184}
185
186
187subsys_initcall(acpi_system_init);