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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 | ||
1da177e4 | 33 | #define _COMPONENT ACPI_SYSTEM_COMPONENT |
f52fd66d | 34 | ACPI_MODULE_NAME("system"); |
5bb730fd ZR |
35 | #ifdef MODULE_PARAM_PREFIX |
36 | #undef MODULE_PARAM_PREFIX | |
37 | #endif | |
38 | #define MODULE_PARAM_PREFIX "acpi." | |
39 | ||
1da177e4 LT |
40 | #define ACPI_SYSTEM_CLASS "system" |
41 | #define ACPI_SYSTEM_DRIVER_NAME "ACPI System Driver" | |
42 | #define ACPI_SYSTEM_DEVICE_NAME "System" | |
43 | #define ACPI_SYSTEM_FILE_INFO "info" | |
44 | #define ACPI_SYSTEM_FILE_EVENT "event" | |
45 | #define ACPI_SYSTEM_FILE_DSDT "dsdt" | |
46 | #define ACPI_SYSTEM_FILE_FADT "fadt" | |
1da177e4 | 47 | |
5bb730fd ZR |
48 | /* |
49 | * Make ACPICA version work as module param | |
50 | */ | |
51 | static int param_get_acpica_version(char *buffer, struct kernel_param *kp) { | |
52 | int result; | |
53 | ||
54 | result = sprintf(buffer, "%x", ACPI_CA_VERSION); | |
55 | ||
56 | return result; | |
57 | } | |
58 | ||
59 | module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444); | |
60 | ||
1da177e4 LT |
61 | /* -------------------------------------------------------------------------- |
62 | FS Interface (/proc) | |
63 | -------------------------------------------------------------------------- */ | |
5bb730fd | 64 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 | 65 | |
4be44fcd | 66 | static int acpi_system_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 67 | { |
1da177e4 LT |
68 | |
69 | seq_printf(seq, "version: %x\n", ACPI_CA_VERSION); | |
d550d98d | 70 | return 0; |
1da177e4 LT |
71 | } |
72 | ||
73 | static int acpi_system_info_open_fs(struct inode *inode, struct file *file) | |
74 | { | |
75 | return single_open(file, acpi_system_read_info, PDE(inode)->data); | |
76 | } | |
77 | ||
d7508032 | 78 | static const struct file_operations acpi_system_info_ops = { |
4be44fcd LB |
79 | .open = acpi_system_info_open_fs, |
80 | .read = seq_read, | |
81 | .llseek = seq_lseek, | |
82 | .release = single_release, | |
1da177e4 | 83 | }; |
5bb730fd | 84 | #endif |
1da177e4 | 85 | |
4be44fcd LB |
86 | static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t, |
87 | loff_t *); | |
1da177e4 | 88 | |
d7508032 | 89 | static const struct file_operations acpi_system_dsdt_ops = { |
4be44fcd | 90 | .read = acpi_system_read_dsdt, |
1da177e4 LT |
91 | }; |
92 | ||
93 | static ssize_t | |
4be44fcd LB |
94 | acpi_system_read_dsdt(struct file *file, |
95 | char __user * buffer, size_t count, loff_t * ppos) | |
1da177e4 | 96 | { |
4be44fcd | 97 | acpi_status status = AE_OK; |
ad71860a | 98 | struct acpi_table_header *dsdt = NULL; |
4be44fcd | 99 | ssize_t res; |
1da177e4 | 100 | |
1da177e4 | 101 | |
ad71860a | 102 | status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt); |
1da177e4 | 103 | if (ACPI_FAILURE(status)) |
d550d98d | 104 | return -ENODEV; |
1da177e4 LT |
105 | |
106 | res = simple_read_from_buffer(buffer, count, ppos, | |
ad71860a | 107 | dsdt, dsdt->length); |
1da177e4 | 108 | |
d550d98d | 109 | return res; |
1da177e4 LT |
110 | } |
111 | ||
4be44fcd LB |
112 | static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t, |
113 | loff_t *); | |
1da177e4 | 114 | |
d7508032 | 115 | static const struct file_operations acpi_system_fadt_ops = { |
4be44fcd | 116 | .read = acpi_system_read_fadt, |
1da177e4 LT |
117 | }; |
118 | ||
119 | static ssize_t | |
4be44fcd LB |
120 | acpi_system_read_fadt(struct file *file, |
121 | char __user * buffer, size_t count, loff_t * ppos) | |
1da177e4 | 122 | { |
4be44fcd | 123 | acpi_status status = AE_OK; |
ad71860a | 124 | struct acpi_table_header *fadt = NULL; |
4be44fcd | 125 | ssize_t res; |
1da177e4 | 126 | |
1da177e4 | 127 | |
ad71860a | 128 | status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt); |
1da177e4 | 129 | if (ACPI_FAILURE(status)) |
d550d98d | 130 | return -ENODEV; |
1da177e4 LT |
131 | |
132 | res = simple_read_from_buffer(buffer, count, ppos, | |
ad71860a | 133 | fadt, fadt->length); |
1da177e4 | 134 | |
d550d98d | 135 | return res; |
1da177e4 LT |
136 | } |
137 | ||
4be44fcd | 138 | static int __init acpi_system_init(void) |
1da177e4 | 139 | { |
4be44fcd | 140 | struct proc_dir_entry *entry; |
1da177e4 | 141 | int error = 0; |
4be44fcd | 142 | char *name; |
1da177e4 | 143 | |
1da177e4 LT |
144 | |
145 | if (acpi_disabled) | |
d550d98d | 146 | return 0; |
1da177e4 | 147 | |
5bb730fd | 148 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 LT |
149 | /* 'info' [R] */ |
150 | name = ACPI_SYSTEM_FILE_INFO; | |
4be44fcd | 151 | entry = create_proc_entry(name, S_IRUGO, acpi_root_dir); |
1da177e4 LT |
152 | if (!entry) |
153 | goto Error; | |
154 | else { | |
155 | entry->proc_fops = &acpi_system_info_ops; | |
156 | } | |
5bb730fd | 157 | #endif |
1da177e4 LT |
158 | |
159 | /* 'dsdt' [R] */ | |
160 | name = ACPI_SYSTEM_FILE_DSDT; | |
161 | entry = create_proc_entry(name, S_IRUSR, acpi_root_dir); | |
162 | if (entry) | |
163 | entry->proc_fops = &acpi_system_dsdt_ops; | |
4be44fcd | 164 | else |
1da177e4 LT |
165 | goto Error; |
166 | ||
167 | /* 'fadt' [R] */ | |
168 | name = ACPI_SYSTEM_FILE_FADT; | |
169 | entry = create_proc_entry(name, S_IRUSR, acpi_root_dir); | |
170 | if (entry) | |
171 | entry->proc_fops = &acpi_system_fadt_ops; | |
172 | else | |
173 | goto Error; | |
174 | ||
4be44fcd | 175 | Done: |
d550d98d | 176 | return error; |
1da177e4 | 177 | |
4be44fcd | 178 | Error: |
1da177e4 LT |
179 | remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir); |
180 | remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir); | |
5bb730fd | 181 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 | 182 | remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir); |
5bb730fd | 183 | #endif |
1da177e4 LT |
184 | |
185 | error = -EFAULT; | |
186 | goto Done; | |
187 | } | |
188 | ||
1da177e4 | 189 | subsys_initcall(acpi_system_init); |