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0bf54fcd OP |
1 | /* |
2 | * ACPI configfs support | |
3 | * | |
4 | * Copyright (c) 2016 Intel Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published by | |
8 | * the Free Software Foundation. | |
9 | */ | |
10 | ||
612bd01f OP |
11 | #define pr_fmt(fmt) "ACPI configfs: " fmt |
12 | ||
0bf54fcd OP |
13 | #include <linux/init.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/configfs.h> | |
16 | #include <linux/acpi.h> | |
17 | ||
612bd01f OP |
18 | static struct config_group *acpi_table_group; |
19 | ||
20 | struct acpi_table { | |
21 | struct config_item cfg; | |
22 | struct acpi_table_header *header; | |
23 | }; | |
24 | ||
25 | static ssize_t acpi_table_aml_write(struct config_item *cfg, | |
26 | const void *data, size_t size) | |
27 | { | |
28 | const struct acpi_table_header *header = data; | |
29 | struct acpi_table *table; | |
30 | int ret; | |
31 | ||
32 | table = container_of(cfg, struct acpi_table, cfg); | |
33 | ||
34 | if (table->header) { | |
35 | pr_err("table already loaded\n"); | |
36 | return -EBUSY; | |
37 | } | |
38 | ||
39 | if (header->length != size) { | |
40 | pr_err("invalid table length\n"); | |
41 | return -EINVAL; | |
42 | } | |
43 | ||
44 | if (memcmp(header->signature, ACPI_SIG_SSDT, 4)) { | |
45 | pr_err("invalid table signature\n"); | |
46 | return -EINVAL; | |
47 | } | |
48 | ||
49 | table = container_of(cfg, struct acpi_table, cfg); | |
50 | ||
51 | table->header = kmemdup(header, header->length, GFP_KERNEL); | |
52 | if (!table->header) | |
53 | return -ENOMEM; | |
54 | ||
55 | ret = acpi_load_table(table->header); | |
56 | if (ret) { | |
57 | kfree(table->header); | |
58 | table->header = NULL; | |
59 | } | |
60 | ||
61 | return ret; | |
62 | } | |
63 | ||
64 | static inline struct acpi_table_header *get_header(struct config_item *cfg) | |
65 | { | |
66 | struct acpi_table *table = container_of(cfg, struct acpi_table, cfg); | |
67 | ||
68 | if (!table->header) | |
69 | pr_err("table not loaded\n"); | |
70 | ||
71 | return table->header; | |
72 | } | |
73 | ||
74 | static ssize_t acpi_table_aml_read(struct config_item *cfg, | |
75 | void *data, size_t size) | |
76 | { | |
77 | struct acpi_table_header *h = get_header(cfg); | |
78 | ||
79 | if (!h) | |
80 | return -EINVAL; | |
81 | ||
82 | if (data) | |
83 | memcpy(data, h, h->length); | |
84 | ||
85 | return h->length; | |
86 | } | |
87 | ||
88 | #define MAX_ACPI_TABLE_SIZE (128 * 1024) | |
89 | ||
90 | CONFIGFS_BIN_ATTR(acpi_table_, aml, NULL, MAX_ACPI_TABLE_SIZE); | |
91 | ||
92 | struct configfs_bin_attribute *acpi_table_bin_attrs[] = { | |
93 | &acpi_table_attr_aml, | |
94 | NULL, | |
95 | }; | |
96 | ||
97 | ssize_t acpi_table_signature_show(struct config_item *cfg, char *str) | |
98 | { | |
99 | struct acpi_table_header *h = get_header(cfg); | |
100 | ||
101 | if (!h) | |
102 | return -EINVAL; | |
103 | ||
104 | return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->signature); | |
105 | } | |
106 | ||
107 | ssize_t acpi_table_length_show(struct config_item *cfg, char *str) | |
108 | { | |
109 | struct acpi_table_header *h = get_header(cfg); | |
110 | ||
111 | if (!h) | |
112 | return -EINVAL; | |
113 | ||
114 | return sprintf(str, "%d\n", h->length); | |
115 | } | |
116 | ||
117 | ssize_t acpi_table_revision_show(struct config_item *cfg, char *str) | |
118 | { | |
119 | struct acpi_table_header *h = get_header(cfg); | |
120 | ||
121 | if (!h) | |
122 | return -EINVAL; | |
123 | ||
124 | return sprintf(str, "%d\n", h->revision); | |
125 | } | |
126 | ||
127 | ssize_t acpi_table_oem_id_show(struct config_item *cfg, char *str) | |
128 | { | |
129 | struct acpi_table_header *h = get_header(cfg); | |
130 | ||
131 | if (!h) | |
132 | return -EINVAL; | |
133 | ||
134 | return sprintf(str, "%.*s\n", ACPI_OEM_ID_SIZE, h->oem_id); | |
135 | } | |
136 | ||
137 | ssize_t acpi_table_oem_table_id_show(struct config_item *cfg, char *str) | |
138 | { | |
139 | struct acpi_table_header *h = get_header(cfg); | |
140 | ||
141 | if (!h) | |
142 | return -EINVAL; | |
143 | ||
144 | return sprintf(str, "%.*s\n", ACPI_OEM_TABLE_ID_SIZE, h->oem_table_id); | |
145 | } | |
146 | ||
147 | ssize_t acpi_table_oem_revision_show(struct config_item *cfg, char *str) | |
148 | { | |
149 | struct acpi_table_header *h = get_header(cfg); | |
150 | ||
151 | if (!h) | |
152 | return -EINVAL; | |
153 | ||
154 | return sprintf(str, "%d\n", h->oem_revision); | |
155 | } | |
156 | ||
157 | ssize_t acpi_table_asl_compiler_id_show(struct config_item *cfg, char *str) | |
158 | { | |
159 | struct acpi_table_header *h = get_header(cfg); | |
160 | ||
161 | if (!h) | |
162 | return -EINVAL; | |
163 | ||
164 | return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->asl_compiler_id); | |
165 | } | |
166 | ||
167 | ssize_t acpi_table_asl_compiler_revision_show(struct config_item *cfg, | |
168 | char *str) | |
169 | { | |
170 | struct acpi_table_header *h = get_header(cfg); | |
171 | ||
172 | if (!h) | |
173 | return -EINVAL; | |
174 | ||
175 | return sprintf(str, "%d\n", h->asl_compiler_revision); | |
176 | } | |
177 | ||
178 | CONFIGFS_ATTR_RO(acpi_table_, signature); | |
179 | CONFIGFS_ATTR_RO(acpi_table_, length); | |
180 | CONFIGFS_ATTR_RO(acpi_table_, revision); | |
181 | CONFIGFS_ATTR_RO(acpi_table_, oem_id); | |
182 | CONFIGFS_ATTR_RO(acpi_table_, oem_table_id); | |
183 | CONFIGFS_ATTR_RO(acpi_table_, oem_revision); | |
184 | CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_id); | |
185 | CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_revision); | |
186 | ||
187 | struct configfs_attribute *acpi_table_attrs[] = { | |
188 | &acpi_table_attr_signature, | |
189 | &acpi_table_attr_length, | |
190 | &acpi_table_attr_revision, | |
191 | &acpi_table_attr_oem_id, | |
192 | &acpi_table_attr_oem_table_id, | |
193 | &acpi_table_attr_oem_revision, | |
194 | &acpi_table_attr_asl_compiler_id, | |
195 | &acpi_table_attr_asl_compiler_revision, | |
196 | NULL, | |
197 | }; | |
198 | ||
199 | static struct config_item_type acpi_table_type = { | |
200 | .ct_owner = THIS_MODULE, | |
201 | .ct_bin_attrs = acpi_table_bin_attrs, | |
202 | .ct_attrs = acpi_table_attrs, | |
203 | }; | |
204 | ||
205 | static struct config_item *acpi_table_make_item(struct config_group *group, | |
206 | const char *name) | |
207 | { | |
208 | struct acpi_table *table; | |
209 | ||
210 | table = kzalloc(sizeof(*table), GFP_KERNEL); | |
211 | if (!table) | |
212 | return ERR_PTR(-ENOMEM); | |
213 | ||
214 | config_item_init_type_name(&table->cfg, name, &acpi_table_type); | |
215 | return &table->cfg; | |
216 | } | |
217 | ||
218 | struct configfs_group_operations acpi_table_group_ops = { | |
219 | .make_item = acpi_table_make_item, | |
220 | }; | |
221 | ||
222 | static struct config_item_type acpi_tables_type = { | |
223 | .ct_owner = THIS_MODULE, | |
224 | .ct_group_ops = &acpi_table_group_ops, | |
225 | }; | |
226 | ||
0bf54fcd OP |
227 | static struct config_item_type acpi_root_group_type = { |
228 | .ct_owner = THIS_MODULE, | |
229 | }; | |
230 | ||
231 | static struct configfs_subsystem acpi_configfs = { | |
232 | .su_group = { | |
233 | .cg_item = { | |
234 | .ci_namebuf = "acpi", | |
235 | .ci_type = &acpi_root_group_type, | |
236 | }, | |
237 | }, | |
238 | .su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex), | |
239 | }; | |
240 | ||
241 | static int __init acpi_configfs_init(void) | |
242 | { | |
243 | int ret; | |
244 | struct config_group *root = &acpi_configfs.su_group; | |
245 | ||
246 | config_group_init(root); | |
247 | ||
248 | ret = configfs_register_subsystem(&acpi_configfs); | |
249 | if (ret) | |
250 | return ret; | |
251 | ||
612bd01f OP |
252 | acpi_table_group = configfs_register_default_group(root, "table", |
253 | &acpi_tables_type); | |
254 | return PTR_ERR_OR_ZERO(acpi_table_group); | |
0bf54fcd OP |
255 | } |
256 | module_init(acpi_configfs_init); | |
257 | ||
258 | static void __exit acpi_configfs_exit(void) | |
259 | { | |
612bd01f | 260 | configfs_unregister_default_group(acpi_table_group); |
0bf54fcd OP |
261 | configfs_unregister_subsystem(&acpi_configfs); |
262 | } | |
263 | module_exit(acpi_configfs_exit); | |
264 | ||
265 | MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>"); | |
266 | MODULE_DESCRIPTION("ACPI configfs support"); | |
267 | MODULE_LICENSE("GPL v2"); |