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/seq_file.h>
28 #include <linux/init.h>
29 #include <asm/uaccess.h>
31 #include <acpi/acpi_drivers.h>
33 #define _COMPONENT ACPI_SYSTEM_COMPONENT
34 ACPI_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"
42 extern FADT_DESCRIPTOR acpi_fadt;
44 /* --------------------------------------------------------------------------
46 -------------------------------------------------------------------------- */
48 static int acpi_system_read_info(struct seq_file *seq, void *offset)
50 ACPI_FUNCTION_TRACE("acpi_system_read_info");
52 seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
56 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
58 return single_open(file, acpi_system_read_info, PDE(inode)->data);
61 static struct file_operations acpi_system_info_ops = {
62 .open = acpi_system_info_open_fs,
65 .release = single_release,
68 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
71 static struct file_operations acpi_system_dsdt_ops = {
72 .read = acpi_system_read_dsdt,
76 acpi_system_read_dsdt(struct file *file,
77 char __user * buffer, size_t count, loff_t * ppos)
79 acpi_status status = AE_OK;
80 struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
83 ACPI_FUNCTION_TRACE("acpi_system_read_dsdt");
85 status = acpi_get_table(ACPI_TABLE_DSDT, 1, &dsdt);
86 if (ACPI_FAILURE(status))
87 return_VALUE(-ENODEV);
89 res = simple_read_from_buffer(buffer, count, ppos,
90 dsdt.pointer, dsdt.length);
91 acpi_os_free(dsdt.pointer);
96 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
99 static struct file_operations acpi_system_fadt_ops = {
100 .read = acpi_system_read_fadt,
104 acpi_system_read_fadt(struct file *file,
105 char __user * buffer, size_t count, loff_t * ppos)
107 acpi_status status = AE_OK;
108 struct acpi_buffer fadt = { ACPI_ALLOCATE_BUFFER, NULL };
111 ACPI_FUNCTION_TRACE("acpi_system_read_fadt");
113 status = acpi_get_table(ACPI_TABLE_FADT, 1, &fadt);
114 if (ACPI_FAILURE(status))
115 return_VALUE(-ENODEV);
117 res = simple_read_from_buffer(buffer, count, ppos,
118 fadt.pointer, fadt.length);
119 acpi_os_free(fadt.pointer);
124 static int __init acpi_system_init(void)
126 struct proc_dir_entry *entry;
130 ACPI_FUNCTION_TRACE("acpi_system_init");
136 name = ACPI_SYSTEM_FILE_INFO;
137 entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
141 entry->proc_fops = &acpi_system_info_ops;
145 name = ACPI_SYSTEM_FILE_DSDT;
146 entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
148 entry->proc_fops = &acpi_system_dsdt_ops;
153 name = ACPI_SYSTEM_FILE_FADT;
154 entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
156 entry->proc_fops = &acpi_system_fadt_ops;
164 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
165 "Unable to create '%s' proc fs entry\n", name));
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);
175 subsys_initcall(acpi_system_init);