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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 |
4be44fcd | 34 | ACPI_MODULE_NAME("acpi_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" | |
793c2388 | 47 | extern struct fadt_descriptor acpi_fadt; |
1da177e4 | 48 | |
5bb730fd ZR |
49 | /* |
50 | * Make ACPICA version work as module param | |
51 | */ | |
52 | static int param_get_acpica_version(char *buffer, struct kernel_param *kp) { | |
53 | int result; | |
54 | ||
55 | result = sprintf(buffer, "%x", ACPI_CA_VERSION); | |
56 | ||
57 | return result; | |
58 | } | |
59 | ||
60 | module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444); | |
61 | ||
1da177e4 LT |
62 | /* -------------------------------------------------------------------------- |
63 | FS Interface (/proc) | |
64 | -------------------------------------------------------------------------- */ | |
5bb730fd | 65 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 | 66 | |
4be44fcd | 67 | static int acpi_system_read_info(struct seq_file *seq, void *offset) |
1da177e4 | 68 | { |
1da177e4 LT |
69 | |
70 | seq_printf(seq, "version: %x\n", ACPI_CA_VERSION); | |
d550d98d | 71 | return 0; |
1da177e4 LT |
72 | } |
73 | ||
74 | static int acpi_system_info_open_fs(struct inode *inode, struct file *file) | |
75 | { | |
76 | return single_open(file, acpi_system_read_info, PDE(inode)->data); | |
77 | } | |
78 | ||
d7508032 | 79 | static const struct file_operations acpi_system_info_ops = { |
4be44fcd LB |
80 | .open = acpi_system_info_open_fs, |
81 | .read = seq_read, | |
82 | .llseek = seq_lseek, | |
83 | .release = single_release, | |
1da177e4 | 84 | }; |
5bb730fd | 85 | #endif |
1da177e4 | 86 | |
4be44fcd LB |
87 | static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t, |
88 | loff_t *); | |
1da177e4 | 89 | |
d7508032 | 90 | static const struct file_operations acpi_system_dsdt_ops = { |
4be44fcd | 91 | .read = acpi_system_read_dsdt, |
1da177e4 LT |
92 | }; |
93 | ||
94 | static ssize_t | |
4be44fcd LB |
95 | acpi_system_read_dsdt(struct file *file, |
96 | char __user * buffer, size_t count, loff_t * ppos) | |
1da177e4 | 97 | { |
4be44fcd LB |
98 | acpi_status status = AE_OK; |
99 | struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL }; | |
100 | ssize_t res; | |
1da177e4 | 101 | |
1da177e4 | 102 | |
b229cf92 | 103 | status = acpi_get_table(ACPI_TABLE_ID_DSDT, 1, &dsdt); |
1da177e4 | 104 | if (ACPI_FAILURE(status)) |
d550d98d | 105 | return -ENODEV; |
1da177e4 LT |
106 | |
107 | res = simple_read_from_buffer(buffer, count, ppos, | |
108 | dsdt.pointer, dsdt.length); | |
02438d87 | 109 | kfree(dsdt.pointer); |
1da177e4 | 110 | |
d550d98d | 111 | return res; |
1da177e4 LT |
112 | } |
113 | ||
4be44fcd LB |
114 | static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t, |
115 | loff_t *); | |
1da177e4 | 116 | |
d7508032 | 117 | static const struct file_operations acpi_system_fadt_ops = { |
4be44fcd | 118 | .read = acpi_system_read_fadt, |
1da177e4 LT |
119 | }; |
120 | ||
121 | static ssize_t | |
4be44fcd LB |
122 | acpi_system_read_fadt(struct file *file, |
123 | char __user * buffer, size_t count, loff_t * ppos) | |
1da177e4 | 124 | { |
4be44fcd LB |
125 | acpi_status status = AE_OK; |
126 | struct acpi_buffer fadt = { ACPI_ALLOCATE_BUFFER, NULL }; | |
127 | ssize_t res; | |
1da177e4 | 128 | |
1da177e4 | 129 | |
b229cf92 | 130 | status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &fadt); |
1da177e4 | 131 | if (ACPI_FAILURE(status)) |
d550d98d | 132 | return -ENODEV; |
1da177e4 LT |
133 | |
134 | res = simple_read_from_buffer(buffer, count, ppos, | |
135 | fadt.pointer, fadt.length); | |
02438d87 | 136 | kfree(fadt.pointer); |
1da177e4 | 137 | |
d550d98d | 138 | return res; |
1da177e4 LT |
139 | } |
140 | ||
4be44fcd | 141 | static int __init acpi_system_init(void) |
1da177e4 | 142 | { |
4be44fcd | 143 | struct proc_dir_entry *entry; |
1da177e4 | 144 | int error = 0; |
4be44fcd | 145 | char *name; |
1da177e4 | 146 | |
1da177e4 LT |
147 | |
148 | if (acpi_disabled) | |
d550d98d | 149 | return 0; |
1da177e4 | 150 | |
5bb730fd | 151 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 LT |
152 | /* 'info' [R] */ |
153 | name = ACPI_SYSTEM_FILE_INFO; | |
4be44fcd | 154 | entry = create_proc_entry(name, S_IRUGO, acpi_root_dir); |
1da177e4 LT |
155 | if (!entry) |
156 | goto Error; | |
157 | else { | |
158 | entry->proc_fops = &acpi_system_info_ops; | |
159 | } | |
5bb730fd | 160 | #endif |
1da177e4 LT |
161 | |
162 | /* 'dsdt' [R] */ | |
163 | name = ACPI_SYSTEM_FILE_DSDT; | |
164 | entry = create_proc_entry(name, S_IRUSR, acpi_root_dir); | |
165 | if (entry) | |
166 | entry->proc_fops = &acpi_system_dsdt_ops; | |
4be44fcd | 167 | else |
1da177e4 LT |
168 | goto Error; |
169 | ||
170 | /* 'fadt' [R] */ | |
171 | name = ACPI_SYSTEM_FILE_FADT; | |
172 | entry = create_proc_entry(name, S_IRUSR, acpi_root_dir); | |
173 | if (entry) | |
174 | entry->proc_fops = &acpi_system_fadt_ops; | |
175 | else | |
176 | goto Error; | |
177 | ||
4be44fcd | 178 | Done: |
d550d98d | 179 | return error; |
1da177e4 | 180 | |
4be44fcd | 181 | Error: |
1da177e4 LT |
182 | remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir); |
183 | remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir); | |
5bb730fd | 184 | #ifdef CONFIG_ACPI_PROCFS |
1da177e4 | 185 | remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir); |
5bb730fd | 186 | #endif |
1da177e4 LT |
187 | |
188 | error = -EFAULT; | |
189 | goto Done; | |
190 | } | |
191 | ||
1da177e4 | 192 | subsys_initcall(acpi_system_init); |