2 * acpi_system.c - ACPI System Driver ($Revision: 63 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <linux/proc_fs.h>
27 #include <linux/init.h>
28 #include <asm/uaccess.h>
30 #include <acpi/acpi_drivers.h>
33 #define _COMPONENT ACPI_SYSTEM_COMPONENT
34 ACPI_MODULE_NAME ("acpi_system")
36 #define ACPI_SYSTEM_CLASS "system"
37 #define ACPI_SYSTEM_DRIVER_NAME "ACPI System Driver"
38 #define ACPI_SYSTEM_DEVICE_NAME "System"
39 #define ACPI_SYSTEM_FILE_INFO "info"
40 #define ACPI_SYSTEM_FILE_EVENT "event"
41 #define ACPI_SYSTEM_FILE_DSDT "dsdt"
42 #define ACPI_SYSTEM_FILE_FADT "fadt"
44 extern FADT_DESCRIPTOR acpi_fadt;
46 /* --------------------------------------------------------------------------
48 -------------------------------------------------------------------------- */
51 acpi_system_read_info (
62 ACPI_FUNCTION_TRACE("acpi_system_read_info");
67 p += sprintf(p, "version: %x\n", ACPI_CA_VERSION);
71 if (size <= off+count) *eof = 1;
74 if (size>count) size = count;
80 static ssize_t acpi_system_read_dsdt (struct file*, char __user *, size_t, loff_t*);
82 static struct file_operations acpi_system_dsdt_ops = {
83 .read = acpi_system_read_dsdt,
87 acpi_system_read_dsdt (
93 acpi_status status = AE_OK;
94 struct acpi_buffer dsdt = {ACPI_ALLOCATE_BUFFER, NULL};
98 ACPI_FUNCTION_TRACE("acpi_system_read_dsdt");
100 status = acpi_get_table(ACPI_TABLE_DSDT, 1, &dsdt);
101 if (ACPI_FAILURE(status))
102 return_VALUE(-ENODEV);
104 if (*ppos < dsdt.length) {
105 data = dsdt.pointer + file->f_pos;
106 size = dsdt.length - file->f_pos;
109 if (copy_to_user(buffer, data, size)) {
110 acpi_os_free(dsdt.pointer);
111 return_VALUE(-EFAULT);
115 acpi_os_free(dsdt.pointer);
123 static ssize_t acpi_system_read_fadt (struct file*, char __user *, size_t, loff_t*);
125 static struct file_operations acpi_system_fadt_ops = {
126 .read = acpi_system_read_fadt,
130 acpi_system_read_fadt (
136 acpi_status status = AE_OK;
137 struct acpi_buffer fadt = {ACPI_ALLOCATE_BUFFER, NULL};
141 ACPI_FUNCTION_TRACE("acpi_system_read_fadt");
143 status = acpi_get_table(ACPI_TABLE_FADT, 1, &fadt);
144 if (ACPI_FAILURE(status))
145 return_VALUE(-ENODEV);
147 if (*ppos < fadt.length) {
148 data = fadt.pointer + file->f_pos;
149 size = fadt.length - file->f_pos;
152 if (copy_to_user(buffer, data, size)) {
153 acpi_os_free(fadt.pointer);
154 return_VALUE(-EFAULT);
158 acpi_os_free(fadt.pointer);
166 static int __init acpi_system_init (void)
168 struct proc_dir_entry *entry;
172 ACPI_FUNCTION_TRACE("acpi_system_init");
178 name = ACPI_SYSTEM_FILE_INFO;
179 entry = create_proc_read_entry(name,
180 S_IRUGO, acpi_root_dir, acpi_system_read_info,NULL);
185 name = ACPI_SYSTEM_FILE_DSDT;
186 entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
188 entry->proc_fops = &acpi_system_dsdt_ops;
193 name = ACPI_SYSTEM_FILE_FADT;
194 entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
196 entry->proc_fops = &acpi_system_fadt_ops;
204 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
205 "Unable to create '%s' proc fs entry\n", name));
207 remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
208 remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
209 remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
216 subsys_initcall(acpi_system_init);