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1da177e4 LT |
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 | |
35 | ACPI_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 | ||
45 | extern FADT_DESCRIPTOR acpi_fadt; | |
46 | ||
47 | /* -------------------------------------------------------------------------- | |
48 | FS Interface (/proc) | |
49 | -------------------------------------------------------------------------- */ | |
50 | ||
51 | static int | |
52 | acpi_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 | ||
60 | static 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 | ||
65 | static 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 | ||
72 | static ssize_t acpi_system_read_dsdt (struct file*, char __user *, size_t, loff_t*); | |
73 | ||
74 | static struct file_operations acpi_system_dsdt_ops = { | |
75 | .read = acpi_system_read_dsdt, | |
76 | }; | |
77 | ||
78 | static ssize_t | |
79 | acpi_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 | ||
103 | static ssize_t acpi_system_read_fadt (struct file*, char __user *, size_t, loff_t*); | |
104 | ||
105 | static struct file_operations acpi_system_fadt_ops = { | |
106 | .read = acpi_system_read_fadt, | |
107 | }; | |
108 | ||
109 | static ssize_t | |
110 | acpi_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 | ||
134 | static 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 | ||
187 | subsys_initcall(acpi_system_init); |