Commit | Line | Data |
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948af1f0 MW |
1 | /* |
2 | * dmi-sysfs.c | |
3 | * | |
4 | * This module exports the DMI tables read-only to userspace through the | |
5 | * sysfs file system. | |
6 | * | |
7 | * Data is currently found below | |
8 | * /sys/firmware/dmi/... | |
9 | * | |
10 | * DMI attributes are presented in attribute files with names | |
11 | * formatted using %d-%d, so that the first integer indicates the | |
12 | * structure type (0-255), and the second field is the instance of that | |
13 | * entry. | |
14 | * | |
15 | * Copyright 2011 Google, Inc. | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/kobject.h> | |
23 | #include <linux/dmi.h> | |
24 | #include <linux/capability.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/io.h> | |
28 | ||
29 | #define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider | |
30 | the top entry type is only 8 bits */ | |
31 | ||
32 | struct dmi_sysfs_entry { | |
33 | struct dmi_header dh; | |
34 | struct kobject kobj; | |
35 | int instance; | |
36 | int position; | |
37 | struct list_head list; | |
925a1da7 | 38 | struct kobject *child; |
948af1f0 MW |
39 | }; |
40 | ||
41 | /* | |
42 | * Global list of dmi_sysfs_entry. Even though this should only be | |
43 | * manipulated at setup and teardown, the lazy nature of the kobject | |
44 | * system means we get lazy removes. | |
45 | */ | |
46 | static LIST_HEAD(entry_list); | |
47 | static DEFINE_SPINLOCK(entry_list_lock); | |
48 | ||
49 | /* dmi_sysfs_attribute - Top level attribute. used by all entries. */ | |
50 | struct dmi_sysfs_attribute { | |
51 | struct attribute attr; | |
52 | ssize_t (*show)(struct dmi_sysfs_entry *entry, char *buf); | |
53 | }; | |
54 | ||
55 | #define DMI_SYSFS_ATTR(_entry, _name) \ | |
56 | struct dmi_sysfs_attribute dmi_sysfs_attr_##_entry##_##_name = { \ | |
57 | .attr = {.name = __stringify(_name), .mode = 0400}, \ | |
58 | .show = dmi_sysfs_##_entry##_##_name, \ | |
59 | } | |
60 | ||
61 | /* | |
62 | * dmi_sysfs_mapped_attribute - Attribute where we require the entry be | |
63 | * mapped in. Use in conjunction with dmi_sysfs_specialize_attr_ops. | |
64 | */ | |
65 | struct dmi_sysfs_mapped_attribute { | |
66 | struct attribute attr; | |
67 | ssize_t (*show)(struct dmi_sysfs_entry *entry, | |
68 | const struct dmi_header *dh, | |
69 | char *buf); | |
70 | }; | |
71 | ||
72 | #define DMI_SYSFS_MAPPED_ATTR(_entry, _name) \ | |
73 | struct dmi_sysfs_mapped_attribute dmi_sysfs_attr_##_entry##_##_name = { \ | |
74 | .attr = {.name = __stringify(_name), .mode = 0400}, \ | |
75 | .show = dmi_sysfs_##_entry##_##_name, \ | |
76 | } | |
77 | ||
78 | /************************************************* | |
79 | * Generic DMI entry support. | |
80 | *************************************************/ | |
925a1da7 MW |
81 | static void dmi_entry_free(struct kobject *kobj) |
82 | { | |
83 | kfree(kobj); | |
84 | } | |
948af1f0 MW |
85 | |
86 | static struct dmi_sysfs_entry *to_entry(struct kobject *kobj) | |
87 | { | |
88 | return container_of(kobj, struct dmi_sysfs_entry, kobj); | |
89 | } | |
90 | ||
91 | static struct dmi_sysfs_attribute *to_attr(struct attribute *attr) | |
92 | { | |
93 | return container_of(attr, struct dmi_sysfs_attribute, attr); | |
94 | } | |
95 | ||
96 | static ssize_t dmi_sysfs_attr_show(struct kobject *kobj, | |
97 | struct attribute *_attr, char *buf) | |
98 | { | |
99 | struct dmi_sysfs_entry *entry = to_entry(kobj); | |
100 | struct dmi_sysfs_attribute *attr = to_attr(_attr); | |
101 | ||
102 | /* DMI stuff is only ever admin visible */ | |
103 | if (!capable(CAP_SYS_ADMIN)) | |
104 | return -EACCES; | |
105 | ||
106 | return attr->show(entry, buf); | |
107 | } | |
108 | ||
109 | static const struct sysfs_ops dmi_sysfs_attr_ops = { | |
110 | .show = dmi_sysfs_attr_show, | |
111 | }; | |
112 | ||
113 | typedef ssize_t (*dmi_callback)(struct dmi_sysfs_entry *, | |
114 | const struct dmi_header *dh, void *); | |
115 | ||
116 | struct find_dmi_data { | |
117 | struct dmi_sysfs_entry *entry; | |
118 | dmi_callback callback; | |
119 | void *private; | |
120 | int instance_countdown; | |
121 | ssize_t ret; | |
122 | }; | |
123 | ||
124 | static void find_dmi_entry_helper(const struct dmi_header *dh, | |
125 | void *_data) | |
126 | { | |
127 | struct find_dmi_data *data = _data; | |
128 | struct dmi_sysfs_entry *entry = data->entry; | |
129 | ||
130 | /* Is this the entry we want? */ | |
131 | if (dh->type != entry->dh.type) | |
132 | return; | |
133 | ||
134 | if (data->instance_countdown != 0) { | |
135 | /* try the next instance? */ | |
136 | data->instance_countdown--; | |
137 | return; | |
138 | } | |
139 | ||
140 | /* | |
141 | * Don't ever revisit the instance. Short circuit later | |
142 | * instances by letting the instance_countdown run negative | |
143 | */ | |
144 | data->instance_countdown--; | |
145 | ||
146 | /* Found the entry */ | |
147 | data->ret = data->callback(entry, dh, data->private); | |
148 | } | |
149 | ||
150 | /* State for passing the read parameters through dmi_find_entry() */ | |
151 | struct dmi_read_state { | |
152 | char *buf; | |
153 | loff_t pos; | |
154 | size_t count; | |
155 | }; | |
156 | ||
157 | static ssize_t find_dmi_entry(struct dmi_sysfs_entry *entry, | |
158 | dmi_callback callback, void *private) | |
159 | { | |
160 | struct find_dmi_data data = { | |
161 | .entry = entry, | |
162 | .callback = callback, | |
163 | .private = private, | |
164 | .instance_countdown = entry->instance, | |
165 | .ret = -EIO, /* To signal the entry disappeared */ | |
166 | }; | |
167 | int ret; | |
168 | ||
169 | ret = dmi_walk(find_dmi_entry_helper, &data); | |
170 | /* This shouldn't happen, but just in case. */ | |
171 | if (ret) | |
172 | return -EINVAL; | |
173 | return data.ret; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Calculate and return the byte length of the dmi entry identified by | |
178 | * dh. This includes both the formatted portion as well as the | |
179 | * unformatted string space, including the two trailing nul characters. | |
180 | */ | |
181 | static size_t dmi_entry_length(const struct dmi_header *dh) | |
182 | { | |
183 | const char *p = (const char *)dh; | |
184 | ||
185 | p += dh->length; | |
186 | ||
187 | while (p[0] || p[1]) | |
188 | p++; | |
189 | ||
190 | return 2 + p - (const char *)dh; | |
191 | } | |
192 | ||
925a1da7 MW |
193 | /************************************************* |
194 | * Support bits for specialized DMI entry support | |
195 | *************************************************/ | |
196 | struct dmi_entry_attr_show_data { | |
197 | struct attribute *attr; | |
198 | char *buf; | |
199 | }; | |
200 | ||
201 | static ssize_t dmi_entry_attr_show_helper(struct dmi_sysfs_entry *entry, | |
202 | const struct dmi_header *dh, | |
203 | void *_data) | |
204 | { | |
205 | struct dmi_entry_attr_show_data *data = _data; | |
206 | struct dmi_sysfs_mapped_attribute *attr; | |
207 | ||
208 | attr = container_of(data->attr, | |
209 | struct dmi_sysfs_mapped_attribute, attr); | |
210 | return attr->show(entry, dh, data->buf); | |
211 | } | |
212 | ||
213 | static ssize_t dmi_entry_attr_show(struct kobject *kobj, | |
214 | struct attribute *attr, | |
215 | char *buf) | |
216 | { | |
217 | struct dmi_entry_attr_show_data data = { | |
218 | .attr = attr, | |
219 | .buf = buf, | |
220 | }; | |
221 | /* Find the entry according to our parent and call the | |
222 | * normalized show method hanging off of the attribute */ | |
223 | return find_dmi_entry(to_entry(kobj->parent), | |
224 | dmi_entry_attr_show_helper, &data); | |
225 | } | |
226 | ||
227 | static const struct sysfs_ops dmi_sysfs_specialize_attr_ops = { | |
228 | .show = dmi_entry_attr_show, | |
229 | }; | |
230 | ||
231 | /************************************************* | |
232 | * Specialized DMI entry support. | |
233 | *************************************************/ | |
234 | ||
235 | /*** Type 15 - System Event Table ***/ | |
236 | ||
237 | #define DMI_SEL_ACCESS_METHOD_IO8 0x00 | |
238 | #define DMI_SEL_ACCESS_METHOD_IO2x8 0x01 | |
239 | #define DMI_SEL_ACCESS_METHOD_IO16 0x02 | |
240 | #define DMI_SEL_ACCESS_METHOD_PHYS32 0x03 | |
241 | #define DMI_SEL_ACCESS_METHOD_GPNV 0x04 | |
242 | ||
243 | struct dmi_system_event_log { | |
244 | struct dmi_header header; | |
245 | u16 area_length; | |
246 | u16 header_start_offset; | |
247 | u16 data_start_offset; | |
248 | u8 access_method; | |
249 | u8 status; | |
250 | u32 change_token; | |
251 | union { | |
252 | struct { | |
253 | u16 index_addr; | |
254 | u16 data_addr; | |
255 | } io; | |
256 | u32 phys_addr32; | |
257 | u16 gpnv_handle; | |
258 | u32 access_method_address; | |
259 | }; | |
260 | u8 header_format; | |
261 | u8 type_descriptors_supported_count; | |
262 | u8 per_log_type_descriptor_length; | |
263 | u8 supported_log_type_descriptos[0]; | |
264 | } __packed; | |
265 | ||
925a1da7 MW |
266 | #define DMI_SYSFS_SEL_FIELD(_field) \ |
267 | static ssize_t dmi_sysfs_sel_##_field(struct dmi_sysfs_entry *entry, \ | |
268 | const struct dmi_header *dh, \ | |
269 | char *buf) \ | |
270 | { \ | |
66245ad0 MW |
271 | struct dmi_system_event_log sel; \ |
272 | if (sizeof(sel) > dmi_entry_length(dh)) \ | |
925a1da7 | 273 | return -EIO; \ |
66245ad0 MW |
274 | memcpy(&sel, dh, sizeof(sel)); \ |
275 | return sprintf(buf, "%u\n", sel._field); \ | |
925a1da7 MW |
276 | } \ |
277 | static DMI_SYSFS_MAPPED_ATTR(sel, _field) | |
278 | ||
279 | DMI_SYSFS_SEL_FIELD(area_length); | |
280 | DMI_SYSFS_SEL_FIELD(header_start_offset); | |
281 | DMI_SYSFS_SEL_FIELD(data_start_offset); | |
282 | DMI_SYSFS_SEL_FIELD(access_method); | |
283 | DMI_SYSFS_SEL_FIELD(status); | |
284 | DMI_SYSFS_SEL_FIELD(change_token); | |
285 | DMI_SYSFS_SEL_FIELD(access_method_address); | |
286 | DMI_SYSFS_SEL_FIELD(header_format); | |
287 | DMI_SYSFS_SEL_FIELD(type_descriptors_supported_count); | |
288 | DMI_SYSFS_SEL_FIELD(per_log_type_descriptor_length); | |
289 | ||
290 | static struct attribute *dmi_sysfs_sel_attrs[] = { | |
291 | &dmi_sysfs_attr_sel_area_length.attr, | |
292 | &dmi_sysfs_attr_sel_header_start_offset.attr, | |
293 | &dmi_sysfs_attr_sel_data_start_offset.attr, | |
294 | &dmi_sysfs_attr_sel_access_method.attr, | |
295 | &dmi_sysfs_attr_sel_status.attr, | |
296 | &dmi_sysfs_attr_sel_change_token.attr, | |
297 | &dmi_sysfs_attr_sel_access_method_address.attr, | |
298 | &dmi_sysfs_attr_sel_header_format.attr, | |
299 | &dmi_sysfs_attr_sel_type_descriptors_supported_count.attr, | |
300 | &dmi_sysfs_attr_sel_per_log_type_descriptor_length.attr, | |
301 | NULL, | |
302 | }; | |
303 | ||
304 | ||
305 | static struct kobj_type dmi_system_event_log_ktype = { | |
306 | .release = dmi_entry_free, | |
307 | .sysfs_ops = &dmi_sysfs_specialize_attr_ops, | |
308 | .default_attrs = dmi_sysfs_sel_attrs, | |
309 | }; | |
310 | ||
a3857a5c MW |
311 | typedef u8 (*sel_io_reader)(const struct dmi_system_event_log *sel, |
312 | loff_t offset); | |
313 | ||
314 | static DEFINE_MUTEX(io_port_lock); | |
315 | ||
316 | static u8 read_sel_8bit_indexed_io(const struct dmi_system_event_log *sel, | |
317 | loff_t offset) | |
318 | { | |
319 | u8 ret; | |
320 | ||
321 | mutex_lock(&io_port_lock); | |
322 | outb((u8)offset, sel->io.index_addr); | |
323 | ret = inb(sel->io.data_addr); | |
324 | mutex_unlock(&io_port_lock); | |
325 | return ret; | |
326 | } | |
327 | ||
328 | static u8 read_sel_2x8bit_indexed_io(const struct dmi_system_event_log *sel, | |
329 | loff_t offset) | |
330 | { | |
331 | u8 ret; | |
332 | ||
333 | mutex_lock(&io_port_lock); | |
334 | outb((u8)offset, sel->io.index_addr); | |
335 | outb((u8)(offset >> 8), sel->io.index_addr + 1); | |
336 | ret = inb(sel->io.data_addr); | |
337 | mutex_unlock(&io_port_lock); | |
338 | return ret; | |
339 | } | |
340 | ||
341 | static u8 read_sel_16bit_indexed_io(const struct dmi_system_event_log *sel, | |
342 | loff_t offset) | |
343 | { | |
344 | u8 ret; | |
345 | ||
346 | mutex_lock(&io_port_lock); | |
347 | outw((u16)offset, sel->io.index_addr); | |
348 | ret = inb(sel->io.data_addr); | |
349 | mutex_unlock(&io_port_lock); | |
350 | return ret; | |
351 | } | |
352 | ||
353 | static sel_io_reader sel_io_readers[] = { | |
354 | [DMI_SEL_ACCESS_METHOD_IO8] = read_sel_8bit_indexed_io, | |
355 | [DMI_SEL_ACCESS_METHOD_IO2x8] = read_sel_2x8bit_indexed_io, | |
356 | [DMI_SEL_ACCESS_METHOD_IO16] = read_sel_16bit_indexed_io, | |
357 | }; | |
358 | ||
359 | static ssize_t dmi_sel_raw_read_io(struct dmi_sysfs_entry *entry, | |
360 | const struct dmi_system_event_log *sel, | |
361 | char *buf, loff_t pos, size_t count) | |
362 | { | |
363 | ssize_t wrote = 0; | |
364 | ||
365 | sel_io_reader io_reader = sel_io_readers[sel->access_method]; | |
366 | ||
367 | while (count && pos < sel->area_length) { | |
368 | count--; | |
369 | *(buf++) = io_reader(sel, pos++); | |
370 | wrote++; | |
371 | } | |
372 | ||
373 | return wrote; | |
374 | } | |
375 | ||
376 | static ssize_t dmi_sel_raw_read_phys32(struct dmi_sysfs_entry *entry, | |
377 | const struct dmi_system_event_log *sel, | |
378 | char *buf, loff_t pos, size_t count) | |
379 | { | |
380 | u8 __iomem *mapped; | |
381 | ssize_t wrote = 0; | |
382 | ||
383 | mapped = ioremap(sel->access_method_address, sel->area_length); | |
384 | if (!mapped) | |
385 | return -EIO; | |
386 | ||
387 | while (count && pos < sel->area_length) { | |
388 | count--; | |
389 | *(buf++) = readb(mapped + pos++); | |
390 | wrote++; | |
391 | } | |
392 | ||
393 | iounmap(mapped); | |
394 | return wrote; | |
395 | } | |
396 | ||
397 | static ssize_t dmi_sel_raw_read_helper(struct dmi_sysfs_entry *entry, | |
398 | const struct dmi_header *dh, | |
399 | void *_state) | |
400 | { | |
401 | struct dmi_read_state *state = _state; | |
66245ad0 | 402 | struct dmi_system_event_log sel; |
a3857a5c | 403 | |
66245ad0 | 404 | if (sizeof(sel) > dmi_entry_length(dh)) |
a3857a5c MW |
405 | return -EIO; |
406 | ||
66245ad0 MW |
407 | memcpy(&sel, dh, sizeof(sel)); |
408 | ||
409 | switch (sel.access_method) { | |
a3857a5c MW |
410 | case DMI_SEL_ACCESS_METHOD_IO8: |
411 | case DMI_SEL_ACCESS_METHOD_IO2x8: | |
412 | case DMI_SEL_ACCESS_METHOD_IO16: | |
66245ad0 | 413 | return dmi_sel_raw_read_io(entry, &sel, state->buf, |
a3857a5c MW |
414 | state->pos, state->count); |
415 | case DMI_SEL_ACCESS_METHOD_PHYS32: | |
66245ad0 | 416 | return dmi_sel_raw_read_phys32(entry, &sel, state->buf, |
a3857a5c MW |
417 | state->pos, state->count); |
418 | case DMI_SEL_ACCESS_METHOD_GPNV: | |
419 | pr_info("dmi-sysfs: GPNV support missing.\n"); | |
420 | return -EIO; | |
421 | default: | |
422 | pr_info("dmi-sysfs: Unknown access method %02x\n", | |
66245ad0 | 423 | sel.access_method); |
a3857a5c MW |
424 | return -EIO; |
425 | } | |
426 | } | |
427 | ||
428 | static ssize_t dmi_sel_raw_read(struct file *filp, struct kobject *kobj, | |
429 | struct bin_attribute *bin_attr, | |
430 | char *buf, loff_t pos, size_t count) | |
431 | { | |
432 | struct dmi_sysfs_entry *entry = to_entry(kobj->parent); | |
433 | struct dmi_read_state state = { | |
434 | .buf = buf, | |
435 | .pos = pos, | |
436 | .count = count, | |
437 | }; | |
438 | ||
439 | return find_dmi_entry(entry, dmi_sel_raw_read_helper, &state); | |
440 | } | |
441 | ||
442 | static struct bin_attribute dmi_sel_raw_attr = { | |
443 | .attr = {.name = "raw_event_log", .mode = 0400}, | |
444 | .read = dmi_sel_raw_read, | |
445 | }; | |
446 | ||
925a1da7 MW |
447 | static int dmi_system_event_log(struct dmi_sysfs_entry *entry) |
448 | { | |
449 | int ret; | |
450 | ||
451 | entry->child = kzalloc(sizeof(*entry->child), GFP_KERNEL); | |
452 | if (!entry->child) | |
453 | return -ENOMEM; | |
454 | ret = kobject_init_and_add(entry->child, | |
455 | &dmi_system_event_log_ktype, | |
456 | &entry->kobj, | |
457 | "system_event_log"); | |
458 | if (ret) | |
459 | goto out_free; | |
a3857a5c MW |
460 | |
461 | ret = sysfs_create_bin_file(entry->child, &dmi_sel_raw_attr); | |
462 | if (ret) | |
463 | goto out_del; | |
464 | ||
465 | return 0; | |
466 | ||
467 | out_del: | |
468 | kobject_del(entry->child); | |
925a1da7 MW |
469 | out_free: |
470 | kfree(entry->child); | |
471 | return ret; | |
472 | } | |
473 | ||
948af1f0 MW |
474 | /************************************************* |
475 | * Generic DMI entry support. | |
476 | *************************************************/ | |
477 | ||
478 | static ssize_t dmi_sysfs_entry_length(struct dmi_sysfs_entry *entry, char *buf) | |
479 | { | |
480 | return sprintf(buf, "%d\n", entry->dh.length); | |
481 | } | |
482 | ||
483 | static ssize_t dmi_sysfs_entry_handle(struct dmi_sysfs_entry *entry, char *buf) | |
484 | { | |
485 | return sprintf(buf, "%d\n", entry->dh.handle); | |
486 | } | |
487 | ||
488 | static ssize_t dmi_sysfs_entry_type(struct dmi_sysfs_entry *entry, char *buf) | |
489 | { | |
490 | return sprintf(buf, "%d\n", entry->dh.type); | |
491 | } | |
492 | ||
493 | static ssize_t dmi_sysfs_entry_instance(struct dmi_sysfs_entry *entry, | |
494 | char *buf) | |
495 | { | |
496 | return sprintf(buf, "%d\n", entry->instance); | |
497 | } | |
498 | ||
499 | static ssize_t dmi_sysfs_entry_position(struct dmi_sysfs_entry *entry, | |
500 | char *buf) | |
501 | { | |
502 | return sprintf(buf, "%d\n", entry->position); | |
503 | } | |
504 | ||
505 | static DMI_SYSFS_ATTR(entry, length); | |
506 | static DMI_SYSFS_ATTR(entry, handle); | |
507 | static DMI_SYSFS_ATTR(entry, type); | |
508 | static DMI_SYSFS_ATTR(entry, instance); | |
509 | static DMI_SYSFS_ATTR(entry, position); | |
510 | ||
511 | static struct attribute *dmi_sysfs_entry_attrs[] = { | |
512 | &dmi_sysfs_attr_entry_length.attr, | |
513 | &dmi_sysfs_attr_entry_handle.attr, | |
514 | &dmi_sysfs_attr_entry_type.attr, | |
515 | &dmi_sysfs_attr_entry_instance.attr, | |
516 | &dmi_sysfs_attr_entry_position.attr, | |
517 | NULL, | |
518 | }; | |
519 | ||
520 | static ssize_t dmi_entry_raw_read_helper(struct dmi_sysfs_entry *entry, | |
521 | const struct dmi_header *dh, | |
522 | void *_state) | |
523 | { | |
524 | struct dmi_read_state *state = _state; | |
525 | size_t entry_length; | |
526 | ||
527 | entry_length = dmi_entry_length(dh); | |
528 | ||
529 | return memory_read_from_buffer(state->buf, state->count, | |
530 | &state->pos, dh, entry_length); | |
531 | } | |
532 | ||
533 | static ssize_t dmi_entry_raw_read(struct file *filp, | |
534 | struct kobject *kobj, | |
535 | struct bin_attribute *bin_attr, | |
536 | char *buf, loff_t pos, size_t count) | |
537 | { | |
538 | struct dmi_sysfs_entry *entry = to_entry(kobj); | |
539 | struct dmi_read_state state = { | |
540 | .buf = buf, | |
541 | .pos = pos, | |
542 | .count = count, | |
543 | }; | |
544 | ||
545 | return find_dmi_entry(entry, dmi_entry_raw_read_helper, &state); | |
546 | } | |
547 | ||
548 | static const struct bin_attribute dmi_entry_raw_attr = { | |
549 | .attr = {.name = "raw", .mode = 0400}, | |
550 | .read = dmi_entry_raw_read, | |
551 | }; | |
552 | ||
553 | static void dmi_sysfs_entry_release(struct kobject *kobj) | |
554 | { | |
555 | struct dmi_sysfs_entry *entry = to_entry(kobj); | |
a61aca28 | 556 | |
948af1f0 MW |
557 | spin_lock(&entry_list_lock); |
558 | list_del(&entry->list); | |
559 | spin_unlock(&entry_list_lock); | |
560 | kfree(entry); | |
561 | } | |
562 | ||
563 | static struct kobj_type dmi_sysfs_entry_ktype = { | |
564 | .release = dmi_sysfs_entry_release, | |
565 | .sysfs_ops = &dmi_sysfs_attr_ops, | |
566 | .default_attrs = dmi_sysfs_entry_attrs, | |
567 | }; | |
568 | ||
948af1f0 MW |
569 | static struct kset *dmi_kset; |
570 | ||
571 | /* Global count of all instances seen. Only for setup */ | |
572 | static int __initdata instance_counts[MAX_ENTRY_TYPE + 1]; | |
573 | ||
574 | /* Global positional count of all entries seen. Only for setup */ | |
575 | static int __initdata position_count; | |
576 | ||
577 | static void __init dmi_sysfs_register_handle(const struct dmi_header *dh, | |
578 | void *_ret) | |
579 | { | |
580 | struct dmi_sysfs_entry *entry; | |
581 | int *ret = _ret; | |
582 | ||
583 | /* If a previous entry saw an error, short circuit */ | |
584 | if (*ret) | |
585 | return; | |
586 | ||
587 | /* Allocate and register a new entry into the entries set */ | |
588 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
589 | if (!entry) { | |
590 | *ret = -ENOMEM; | |
591 | return; | |
592 | } | |
593 | ||
594 | /* Set the key */ | |
66245ad0 | 595 | memcpy(&entry->dh, dh, sizeof(*dh)); |
948af1f0 MW |
596 | entry->instance = instance_counts[dh->type]++; |
597 | entry->position = position_count++; | |
598 | ||
599 | entry->kobj.kset = dmi_kset; | |
600 | *ret = kobject_init_and_add(&entry->kobj, &dmi_sysfs_entry_ktype, NULL, | |
601 | "%d-%d", dh->type, entry->instance); | |
602 | ||
603 | if (*ret) { | |
604 | kfree(entry); | |
605 | return; | |
606 | } | |
607 | ||
608 | /* Thread on the global list for cleanup */ | |
609 | spin_lock(&entry_list_lock); | |
610 | list_add_tail(&entry->list, &entry_list); | |
611 | spin_unlock(&entry_list_lock); | |
612 | ||
925a1da7 MW |
613 | /* Handle specializations by type */ |
614 | switch (dh->type) { | |
615 | case DMI_ENTRY_SYSTEM_EVENT_LOG: | |
616 | *ret = dmi_system_event_log(entry); | |
617 | break; | |
618 | default: | |
619 | /* No specialization */ | |
620 | break; | |
621 | } | |
622 | if (*ret) | |
623 | goto out_err; | |
624 | ||
948af1f0 MW |
625 | /* Create the raw binary file to access the entry */ |
626 | *ret = sysfs_create_bin_file(&entry->kobj, &dmi_entry_raw_attr); | |
627 | if (*ret) | |
628 | goto out_err; | |
629 | ||
630 | return; | |
631 | out_err: | |
925a1da7 | 632 | kobject_put(entry->child); |
948af1f0 MW |
633 | kobject_put(&entry->kobj); |
634 | return; | |
635 | } | |
636 | ||
637 | static void cleanup_entry_list(void) | |
638 | { | |
639 | struct dmi_sysfs_entry *entry, *next; | |
640 | ||
641 | /* No locks, we are on our way out */ | |
642 | list_for_each_entry_safe(entry, next, &entry_list, list) { | |
925a1da7 | 643 | kobject_put(entry->child); |
948af1f0 MW |
644 | kobject_put(&entry->kobj); |
645 | } | |
646 | } | |
647 | ||
648 | static int __init dmi_sysfs_init(void) | |
649 | { | |
d7f96f97 | 650 | int error; |
948af1f0 MW |
651 | int val; |
652 | ||
d7f96f97 IK |
653 | if (!dmi_kobj) { |
654 | pr_err("dmi-sysfs: dmi entry is absent.\n"); | |
655 | error = -ENODATA; | |
948af1f0 | 656 | goto err; |
d7f96f97 | 657 | } |
948af1f0 MW |
658 | |
659 | dmi_kset = kset_create_and_add("entries", NULL, dmi_kobj); | |
d7f96f97 IK |
660 | if (!dmi_kset) { |
661 | error = -ENOMEM; | |
948af1f0 | 662 | goto err; |
d7f96f97 | 663 | } |
948af1f0 MW |
664 | |
665 | val = 0; | |
666 | error = dmi_walk(dmi_sysfs_register_handle, &val); | |
667 | if (error) | |
668 | goto err; | |
669 | if (val) { | |
670 | error = val; | |
671 | goto err; | |
672 | } | |
673 | ||
674 | pr_debug("dmi-sysfs: loaded.\n"); | |
675 | ||
676 | return 0; | |
677 | err: | |
678 | cleanup_entry_list(); | |
679 | kset_unregister(dmi_kset); | |
948af1f0 MW |
680 | return error; |
681 | } | |
682 | ||
683 | /* clean up everything. */ | |
684 | static void __exit dmi_sysfs_exit(void) | |
685 | { | |
686 | pr_debug("dmi-sysfs: unloading.\n"); | |
687 | cleanup_entry_list(); | |
688 | kset_unregister(dmi_kset); | |
948af1f0 MW |
689 | } |
690 | ||
691 | module_init(dmi_sysfs_init); | |
692 | module_exit(dmi_sysfs_exit); | |
693 | ||
694 | MODULE_AUTHOR("Mike Waychison <mikew@google.com>"); | |
695 | MODULE_DESCRIPTION("DMI sysfs support"); | |
696 | MODULE_LICENSE("GPL"); |