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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> | |
f7750a79 | 28 | #include <asm/dmi.h> |
948af1f0 MW |
29 | |
30 | #define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider | |
31 | the top entry type is only 8 bits */ | |
32 | ||
33 | struct dmi_sysfs_entry { | |
34 | struct dmi_header dh; | |
35 | struct kobject kobj; | |
36 | int instance; | |
37 | int position; | |
38 | struct list_head list; | |
925a1da7 | 39 | struct kobject *child; |
948af1f0 MW |
40 | }; |
41 | ||
42 | /* | |
43 | * Global list of dmi_sysfs_entry. Even though this should only be | |
44 | * manipulated at setup and teardown, the lazy nature of the kobject | |
45 | * system means we get lazy removes. | |
46 | */ | |
47 | static LIST_HEAD(entry_list); | |
48 | static DEFINE_SPINLOCK(entry_list_lock); | |
49 | ||
50 | /* dmi_sysfs_attribute - Top level attribute. used by all entries. */ | |
51 | struct dmi_sysfs_attribute { | |
52 | struct attribute attr; | |
53 | ssize_t (*show)(struct dmi_sysfs_entry *entry, char *buf); | |
54 | }; | |
55 | ||
56 | #define DMI_SYSFS_ATTR(_entry, _name) \ | |
57 | struct dmi_sysfs_attribute dmi_sysfs_attr_##_entry##_##_name = { \ | |
58 | .attr = {.name = __stringify(_name), .mode = 0400}, \ | |
59 | .show = dmi_sysfs_##_entry##_##_name, \ | |
60 | } | |
61 | ||
62 | /* | |
63 | * dmi_sysfs_mapped_attribute - Attribute where we require the entry be | |
64 | * mapped in. Use in conjunction with dmi_sysfs_specialize_attr_ops. | |
65 | */ | |
66 | struct dmi_sysfs_mapped_attribute { | |
67 | struct attribute attr; | |
68 | ssize_t (*show)(struct dmi_sysfs_entry *entry, | |
69 | const struct dmi_header *dh, | |
70 | char *buf); | |
71 | }; | |
72 | ||
73 | #define DMI_SYSFS_MAPPED_ATTR(_entry, _name) \ | |
74 | struct dmi_sysfs_mapped_attribute dmi_sysfs_attr_##_entry##_##_name = { \ | |
75 | .attr = {.name = __stringify(_name), .mode = 0400}, \ | |
76 | .show = dmi_sysfs_##_entry##_##_name, \ | |
77 | } | |
78 | ||
79 | /************************************************* | |
80 | * Generic DMI entry support. | |
81 | *************************************************/ | |
925a1da7 MW |
82 | static void dmi_entry_free(struct kobject *kobj) |
83 | { | |
84 | kfree(kobj); | |
85 | } | |
948af1f0 MW |
86 | |
87 | static struct dmi_sysfs_entry *to_entry(struct kobject *kobj) | |
88 | { | |
89 | return container_of(kobj, struct dmi_sysfs_entry, kobj); | |
90 | } | |
91 | ||
92 | static struct dmi_sysfs_attribute *to_attr(struct attribute *attr) | |
93 | { | |
94 | return container_of(attr, struct dmi_sysfs_attribute, attr); | |
95 | } | |
96 | ||
97 | static ssize_t dmi_sysfs_attr_show(struct kobject *kobj, | |
98 | struct attribute *_attr, char *buf) | |
99 | { | |
100 | struct dmi_sysfs_entry *entry = to_entry(kobj); | |
101 | struct dmi_sysfs_attribute *attr = to_attr(_attr); | |
102 | ||
103 | /* DMI stuff is only ever admin visible */ | |
104 | if (!capable(CAP_SYS_ADMIN)) | |
105 | return -EACCES; | |
106 | ||
107 | return attr->show(entry, buf); | |
108 | } | |
109 | ||
110 | static const struct sysfs_ops dmi_sysfs_attr_ops = { | |
111 | .show = dmi_sysfs_attr_show, | |
112 | }; | |
113 | ||
114 | typedef ssize_t (*dmi_callback)(struct dmi_sysfs_entry *, | |
115 | const struct dmi_header *dh, void *); | |
116 | ||
117 | struct find_dmi_data { | |
118 | struct dmi_sysfs_entry *entry; | |
119 | dmi_callback callback; | |
120 | void *private; | |
121 | int instance_countdown; | |
122 | ssize_t ret; | |
123 | }; | |
124 | ||
125 | static void find_dmi_entry_helper(const struct dmi_header *dh, | |
126 | void *_data) | |
127 | { | |
128 | struct find_dmi_data *data = _data; | |
129 | struct dmi_sysfs_entry *entry = data->entry; | |
130 | ||
131 | /* Is this the entry we want? */ | |
132 | if (dh->type != entry->dh.type) | |
133 | return; | |
134 | ||
135 | if (data->instance_countdown != 0) { | |
136 | /* try the next instance? */ | |
137 | data->instance_countdown--; | |
138 | return; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Don't ever revisit the instance. Short circuit later | |
143 | * instances by letting the instance_countdown run negative | |
144 | */ | |
145 | data->instance_countdown--; | |
146 | ||
147 | /* Found the entry */ | |
148 | data->ret = data->callback(entry, dh, data->private); | |
149 | } | |
150 | ||
151 | /* State for passing the read parameters through dmi_find_entry() */ | |
152 | struct dmi_read_state { | |
153 | char *buf; | |
154 | loff_t pos; | |
155 | size_t count; | |
156 | }; | |
157 | ||
158 | static ssize_t find_dmi_entry(struct dmi_sysfs_entry *entry, | |
159 | dmi_callback callback, void *private) | |
160 | { | |
161 | struct find_dmi_data data = { | |
162 | .entry = entry, | |
163 | .callback = callback, | |
164 | .private = private, | |
165 | .instance_countdown = entry->instance, | |
166 | .ret = -EIO, /* To signal the entry disappeared */ | |
167 | }; | |
168 | int ret; | |
169 | ||
170 | ret = dmi_walk(find_dmi_entry_helper, &data); | |
171 | /* This shouldn't happen, but just in case. */ | |
172 | if (ret) | |
173 | return -EINVAL; | |
174 | return data.ret; | |
175 | } | |
176 | ||
177 | /* | |
178 | * Calculate and return the byte length of the dmi entry identified by | |
179 | * dh. This includes both the formatted portion as well as the | |
180 | * unformatted string space, including the two trailing nul characters. | |
181 | */ | |
182 | static size_t dmi_entry_length(const struct dmi_header *dh) | |
183 | { | |
184 | const char *p = (const char *)dh; | |
185 | ||
186 | p += dh->length; | |
187 | ||
188 | while (p[0] || p[1]) | |
189 | p++; | |
190 | ||
191 | return 2 + p - (const char *)dh; | |
192 | } | |
193 | ||
925a1da7 MW |
194 | /************************************************* |
195 | * Support bits for specialized DMI entry support | |
196 | *************************************************/ | |
197 | struct dmi_entry_attr_show_data { | |
198 | struct attribute *attr; | |
199 | char *buf; | |
200 | }; | |
201 | ||
202 | static ssize_t dmi_entry_attr_show_helper(struct dmi_sysfs_entry *entry, | |
203 | const struct dmi_header *dh, | |
204 | void *_data) | |
205 | { | |
206 | struct dmi_entry_attr_show_data *data = _data; | |
207 | struct dmi_sysfs_mapped_attribute *attr; | |
208 | ||
209 | attr = container_of(data->attr, | |
210 | struct dmi_sysfs_mapped_attribute, attr); | |
211 | return attr->show(entry, dh, data->buf); | |
212 | } | |
213 | ||
214 | static ssize_t dmi_entry_attr_show(struct kobject *kobj, | |
215 | struct attribute *attr, | |
216 | char *buf) | |
217 | { | |
218 | struct dmi_entry_attr_show_data data = { | |
219 | .attr = attr, | |
220 | .buf = buf, | |
221 | }; | |
222 | /* Find the entry according to our parent and call the | |
223 | * normalized show method hanging off of the attribute */ | |
224 | return find_dmi_entry(to_entry(kobj->parent), | |
225 | dmi_entry_attr_show_helper, &data); | |
226 | } | |
227 | ||
228 | static const struct sysfs_ops dmi_sysfs_specialize_attr_ops = { | |
229 | .show = dmi_entry_attr_show, | |
230 | }; | |
231 | ||
232 | /************************************************* | |
233 | * Specialized DMI entry support. | |
234 | *************************************************/ | |
235 | ||
236 | /*** Type 15 - System Event Table ***/ | |
237 | ||
238 | #define DMI_SEL_ACCESS_METHOD_IO8 0x00 | |
239 | #define DMI_SEL_ACCESS_METHOD_IO2x8 0x01 | |
240 | #define DMI_SEL_ACCESS_METHOD_IO16 0x02 | |
241 | #define DMI_SEL_ACCESS_METHOD_PHYS32 0x03 | |
242 | #define DMI_SEL_ACCESS_METHOD_GPNV 0x04 | |
243 | ||
244 | struct dmi_system_event_log { | |
245 | struct dmi_header header; | |
246 | u16 area_length; | |
247 | u16 header_start_offset; | |
248 | u16 data_start_offset; | |
249 | u8 access_method; | |
250 | u8 status; | |
251 | u32 change_token; | |
252 | union { | |
253 | struct { | |
254 | u16 index_addr; | |
255 | u16 data_addr; | |
256 | } io; | |
257 | u32 phys_addr32; | |
258 | u16 gpnv_handle; | |
259 | u32 access_method_address; | |
260 | }; | |
261 | u8 header_format; | |
262 | u8 type_descriptors_supported_count; | |
263 | u8 per_log_type_descriptor_length; | |
264 | u8 supported_log_type_descriptos[0]; | |
265 | } __packed; | |
266 | ||
925a1da7 MW |
267 | #define DMI_SYSFS_SEL_FIELD(_field) \ |
268 | static ssize_t dmi_sysfs_sel_##_field(struct dmi_sysfs_entry *entry, \ | |
269 | const struct dmi_header *dh, \ | |
270 | char *buf) \ | |
271 | { \ | |
66245ad0 MW |
272 | struct dmi_system_event_log sel; \ |
273 | if (sizeof(sel) > dmi_entry_length(dh)) \ | |
925a1da7 | 274 | return -EIO; \ |
66245ad0 MW |
275 | memcpy(&sel, dh, sizeof(sel)); \ |
276 | return sprintf(buf, "%u\n", sel._field); \ | |
925a1da7 MW |
277 | } \ |
278 | static DMI_SYSFS_MAPPED_ATTR(sel, _field) | |
279 | ||
280 | DMI_SYSFS_SEL_FIELD(area_length); | |
281 | DMI_SYSFS_SEL_FIELD(header_start_offset); | |
282 | DMI_SYSFS_SEL_FIELD(data_start_offset); | |
283 | DMI_SYSFS_SEL_FIELD(access_method); | |
284 | DMI_SYSFS_SEL_FIELD(status); | |
285 | DMI_SYSFS_SEL_FIELD(change_token); | |
286 | DMI_SYSFS_SEL_FIELD(access_method_address); | |
287 | DMI_SYSFS_SEL_FIELD(header_format); | |
288 | DMI_SYSFS_SEL_FIELD(type_descriptors_supported_count); | |
289 | DMI_SYSFS_SEL_FIELD(per_log_type_descriptor_length); | |
290 | ||
291 | static struct attribute *dmi_sysfs_sel_attrs[] = { | |
292 | &dmi_sysfs_attr_sel_area_length.attr, | |
293 | &dmi_sysfs_attr_sel_header_start_offset.attr, | |
294 | &dmi_sysfs_attr_sel_data_start_offset.attr, | |
295 | &dmi_sysfs_attr_sel_access_method.attr, | |
296 | &dmi_sysfs_attr_sel_status.attr, | |
297 | &dmi_sysfs_attr_sel_change_token.attr, | |
298 | &dmi_sysfs_attr_sel_access_method_address.attr, | |
299 | &dmi_sysfs_attr_sel_header_format.attr, | |
300 | &dmi_sysfs_attr_sel_type_descriptors_supported_count.attr, | |
301 | &dmi_sysfs_attr_sel_per_log_type_descriptor_length.attr, | |
302 | NULL, | |
303 | }; | |
304 | ||
305 | ||
306 | static struct kobj_type dmi_system_event_log_ktype = { | |
307 | .release = dmi_entry_free, | |
308 | .sysfs_ops = &dmi_sysfs_specialize_attr_ops, | |
309 | .default_attrs = dmi_sysfs_sel_attrs, | |
310 | }; | |
311 | ||
a3857a5c MW |
312 | typedef u8 (*sel_io_reader)(const struct dmi_system_event_log *sel, |
313 | loff_t offset); | |
314 | ||
315 | static DEFINE_MUTEX(io_port_lock); | |
316 | ||
317 | static u8 read_sel_8bit_indexed_io(const struct dmi_system_event_log *sel, | |
318 | loff_t offset) | |
319 | { | |
320 | u8 ret; | |
321 | ||
322 | mutex_lock(&io_port_lock); | |
323 | outb((u8)offset, sel->io.index_addr); | |
324 | ret = inb(sel->io.data_addr); | |
325 | mutex_unlock(&io_port_lock); | |
326 | return ret; | |
327 | } | |
328 | ||
329 | static u8 read_sel_2x8bit_indexed_io(const struct dmi_system_event_log *sel, | |
330 | loff_t offset) | |
331 | { | |
332 | u8 ret; | |
333 | ||
334 | mutex_lock(&io_port_lock); | |
335 | outb((u8)offset, sel->io.index_addr); | |
336 | outb((u8)(offset >> 8), sel->io.index_addr + 1); | |
337 | ret = inb(sel->io.data_addr); | |
338 | mutex_unlock(&io_port_lock); | |
339 | return ret; | |
340 | } | |
341 | ||
342 | static u8 read_sel_16bit_indexed_io(const struct dmi_system_event_log *sel, | |
343 | loff_t offset) | |
344 | { | |
345 | u8 ret; | |
346 | ||
347 | mutex_lock(&io_port_lock); | |
348 | outw((u16)offset, sel->io.index_addr); | |
349 | ret = inb(sel->io.data_addr); | |
350 | mutex_unlock(&io_port_lock); | |
351 | return ret; | |
352 | } | |
353 | ||
354 | static sel_io_reader sel_io_readers[] = { | |
355 | [DMI_SEL_ACCESS_METHOD_IO8] = read_sel_8bit_indexed_io, | |
356 | [DMI_SEL_ACCESS_METHOD_IO2x8] = read_sel_2x8bit_indexed_io, | |
357 | [DMI_SEL_ACCESS_METHOD_IO16] = read_sel_16bit_indexed_io, | |
358 | }; | |
359 | ||
360 | static ssize_t dmi_sel_raw_read_io(struct dmi_sysfs_entry *entry, | |
361 | const struct dmi_system_event_log *sel, | |
362 | char *buf, loff_t pos, size_t count) | |
363 | { | |
364 | ssize_t wrote = 0; | |
365 | ||
366 | sel_io_reader io_reader = sel_io_readers[sel->access_method]; | |
367 | ||
368 | while (count && pos < sel->area_length) { | |
369 | count--; | |
370 | *(buf++) = io_reader(sel, pos++); | |
371 | wrote++; | |
372 | } | |
373 | ||
374 | return wrote; | |
375 | } | |
376 | ||
377 | static ssize_t dmi_sel_raw_read_phys32(struct dmi_sysfs_entry *entry, | |
378 | const struct dmi_system_event_log *sel, | |
379 | char *buf, loff_t pos, size_t count) | |
380 | { | |
381 | u8 __iomem *mapped; | |
382 | ssize_t wrote = 0; | |
383 | ||
f7750a79 | 384 | mapped = dmi_remap(sel->access_method_address, sel->area_length); |
a3857a5c MW |
385 | if (!mapped) |
386 | return -EIO; | |
387 | ||
388 | while (count && pos < sel->area_length) { | |
389 | count--; | |
390 | *(buf++) = readb(mapped + pos++); | |
391 | wrote++; | |
392 | } | |
393 | ||
f7750a79 | 394 | dmi_unmap(mapped); |
a3857a5c MW |
395 | return wrote; |
396 | } | |
397 | ||
398 | static ssize_t dmi_sel_raw_read_helper(struct dmi_sysfs_entry *entry, | |
399 | const struct dmi_header *dh, | |
400 | void *_state) | |
401 | { | |
402 | struct dmi_read_state *state = _state; | |
66245ad0 | 403 | struct dmi_system_event_log sel; |
a3857a5c | 404 | |
66245ad0 | 405 | if (sizeof(sel) > dmi_entry_length(dh)) |
a3857a5c MW |
406 | return -EIO; |
407 | ||
66245ad0 MW |
408 | memcpy(&sel, dh, sizeof(sel)); |
409 | ||
410 | switch (sel.access_method) { | |
a3857a5c MW |
411 | case DMI_SEL_ACCESS_METHOD_IO8: |
412 | case DMI_SEL_ACCESS_METHOD_IO2x8: | |
413 | case DMI_SEL_ACCESS_METHOD_IO16: | |
66245ad0 | 414 | return dmi_sel_raw_read_io(entry, &sel, state->buf, |
a3857a5c MW |
415 | state->pos, state->count); |
416 | case DMI_SEL_ACCESS_METHOD_PHYS32: | |
66245ad0 | 417 | return dmi_sel_raw_read_phys32(entry, &sel, state->buf, |
a3857a5c MW |
418 | state->pos, state->count); |
419 | case DMI_SEL_ACCESS_METHOD_GPNV: | |
420 | pr_info("dmi-sysfs: GPNV support missing.\n"); | |
421 | return -EIO; | |
422 | default: | |
423 | pr_info("dmi-sysfs: Unknown access method %02x\n", | |
66245ad0 | 424 | sel.access_method); |
a3857a5c MW |
425 | return -EIO; |
426 | } | |
427 | } | |
428 | ||
429 | static ssize_t dmi_sel_raw_read(struct file *filp, struct kobject *kobj, | |
430 | struct bin_attribute *bin_attr, | |
431 | char *buf, loff_t pos, size_t count) | |
432 | { | |
433 | struct dmi_sysfs_entry *entry = to_entry(kobj->parent); | |
434 | struct dmi_read_state state = { | |
435 | .buf = buf, | |
436 | .pos = pos, | |
437 | .count = count, | |
438 | }; | |
439 | ||
440 | return find_dmi_entry(entry, dmi_sel_raw_read_helper, &state); | |
441 | } | |
442 | ||
443 | static struct bin_attribute dmi_sel_raw_attr = { | |
444 | .attr = {.name = "raw_event_log", .mode = 0400}, | |
445 | .read = dmi_sel_raw_read, | |
446 | }; | |
447 | ||
925a1da7 MW |
448 | static int dmi_system_event_log(struct dmi_sysfs_entry *entry) |
449 | { | |
450 | int ret; | |
451 | ||
452 | entry->child = kzalloc(sizeof(*entry->child), GFP_KERNEL); | |
453 | if (!entry->child) | |
454 | return -ENOMEM; | |
455 | ret = kobject_init_and_add(entry->child, | |
456 | &dmi_system_event_log_ktype, | |
457 | &entry->kobj, | |
458 | "system_event_log"); | |
459 | if (ret) | |
460 | goto out_free; | |
a3857a5c MW |
461 | |
462 | ret = sysfs_create_bin_file(entry->child, &dmi_sel_raw_attr); | |
463 | if (ret) | |
464 | goto out_del; | |
465 | ||
466 | return 0; | |
467 | ||
468 | out_del: | |
469 | kobject_del(entry->child); | |
925a1da7 MW |
470 | out_free: |
471 | kfree(entry->child); | |
472 | return ret; | |
473 | } | |
474 | ||
948af1f0 MW |
475 | /************************************************* |
476 | * Generic DMI entry support. | |
477 | *************************************************/ | |
478 | ||
479 | static ssize_t dmi_sysfs_entry_length(struct dmi_sysfs_entry *entry, char *buf) | |
480 | { | |
481 | return sprintf(buf, "%d\n", entry->dh.length); | |
482 | } | |
483 | ||
484 | static ssize_t dmi_sysfs_entry_handle(struct dmi_sysfs_entry *entry, char *buf) | |
485 | { | |
486 | return sprintf(buf, "%d\n", entry->dh.handle); | |
487 | } | |
488 | ||
489 | static ssize_t dmi_sysfs_entry_type(struct dmi_sysfs_entry *entry, char *buf) | |
490 | { | |
491 | return sprintf(buf, "%d\n", entry->dh.type); | |
492 | } | |
493 | ||
494 | static ssize_t dmi_sysfs_entry_instance(struct dmi_sysfs_entry *entry, | |
495 | char *buf) | |
496 | { | |
497 | return sprintf(buf, "%d\n", entry->instance); | |
498 | } | |
499 | ||
500 | static ssize_t dmi_sysfs_entry_position(struct dmi_sysfs_entry *entry, | |
501 | char *buf) | |
502 | { | |
503 | return sprintf(buf, "%d\n", entry->position); | |
504 | } | |
505 | ||
506 | static DMI_SYSFS_ATTR(entry, length); | |
507 | static DMI_SYSFS_ATTR(entry, handle); | |
508 | static DMI_SYSFS_ATTR(entry, type); | |
509 | static DMI_SYSFS_ATTR(entry, instance); | |
510 | static DMI_SYSFS_ATTR(entry, position); | |
511 | ||
512 | static struct attribute *dmi_sysfs_entry_attrs[] = { | |
513 | &dmi_sysfs_attr_entry_length.attr, | |
514 | &dmi_sysfs_attr_entry_handle.attr, | |
515 | &dmi_sysfs_attr_entry_type.attr, | |
516 | &dmi_sysfs_attr_entry_instance.attr, | |
517 | &dmi_sysfs_attr_entry_position.attr, | |
518 | NULL, | |
519 | }; | |
520 | ||
521 | static ssize_t dmi_entry_raw_read_helper(struct dmi_sysfs_entry *entry, | |
522 | const struct dmi_header *dh, | |
523 | void *_state) | |
524 | { | |
525 | struct dmi_read_state *state = _state; | |
526 | size_t entry_length; | |
527 | ||
528 | entry_length = dmi_entry_length(dh); | |
529 | ||
530 | return memory_read_from_buffer(state->buf, state->count, | |
531 | &state->pos, dh, entry_length); | |
532 | } | |
533 | ||
534 | static ssize_t dmi_entry_raw_read(struct file *filp, | |
535 | struct kobject *kobj, | |
536 | struct bin_attribute *bin_attr, | |
537 | char *buf, loff_t pos, size_t count) | |
538 | { | |
539 | struct dmi_sysfs_entry *entry = to_entry(kobj); | |
540 | struct dmi_read_state state = { | |
541 | .buf = buf, | |
542 | .pos = pos, | |
543 | .count = count, | |
544 | }; | |
545 | ||
546 | return find_dmi_entry(entry, dmi_entry_raw_read_helper, &state); | |
547 | } | |
548 | ||
549 | static const struct bin_attribute dmi_entry_raw_attr = { | |
550 | .attr = {.name = "raw", .mode = 0400}, | |
551 | .read = dmi_entry_raw_read, | |
552 | }; | |
553 | ||
554 | static void dmi_sysfs_entry_release(struct kobject *kobj) | |
555 | { | |
556 | struct dmi_sysfs_entry *entry = to_entry(kobj); | |
a61aca28 | 557 | |
948af1f0 MW |
558 | spin_lock(&entry_list_lock); |
559 | list_del(&entry->list); | |
560 | spin_unlock(&entry_list_lock); | |
561 | kfree(entry); | |
562 | } | |
563 | ||
564 | static struct kobj_type dmi_sysfs_entry_ktype = { | |
565 | .release = dmi_sysfs_entry_release, | |
566 | .sysfs_ops = &dmi_sysfs_attr_ops, | |
567 | .default_attrs = dmi_sysfs_entry_attrs, | |
568 | }; | |
569 | ||
948af1f0 MW |
570 | static struct kset *dmi_kset; |
571 | ||
572 | /* Global count of all instances seen. Only for setup */ | |
573 | static int __initdata instance_counts[MAX_ENTRY_TYPE + 1]; | |
574 | ||
575 | /* Global positional count of all entries seen. Only for setup */ | |
576 | static int __initdata position_count; | |
577 | ||
578 | static void __init dmi_sysfs_register_handle(const struct dmi_header *dh, | |
579 | void *_ret) | |
580 | { | |
581 | struct dmi_sysfs_entry *entry; | |
582 | int *ret = _ret; | |
583 | ||
584 | /* If a previous entry saw an error, short circuit */ | |
585 | if (*ret) | |
586 | return; | |
587 | ||
588 | /* Allocate and register a new entry into the entries set */ | |
589 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
590 | if (!entry) { | |
591 | *ret = -ENOMEM; | |
592 | return; | |
593 | } | |
594 | ||
595 | /* Set the key */ | |
66245ad0 | 596 | memcpy(&entry->dh, dh, sizeof(*dh)); |
948af1f0 MW |
597 | entry->instance = instance_counts[dh->type]++; |
598 | entry->position = position_count++; | |
599 | ||
600 | entry->kobj.kset = dmi_kset; | |
601 | *ret = kobject_init_and_add(&entry->kobj, &dmi_sysfs_entry_ktype, NULL, | |
602 | "%d-%d", dh->type, entry->instance); | |
603 | ||
604 | if (*ret) { | |
605 | kfree(entry); | |
606 | return; | |
607 | } | |
608 | ||
609 | /* Thread on the global list for cleanup */ | |
610 | spin_lock(&entry_list_lock); | |
611 | list_add_tail(&entry->list, &entry_list); | |
612 | spin_unlock(&entry_list_lock); | |
613 | ||
925a1da7 MW |
614 | /* Handle specializations by type */ |
615 | switch (dh->type) { | |
616 | case DMI_ENTRY_SYSTEM_EVENT_LOG: | |
617 | *ret = dmi_system_event_log(entry); | |
618 | break; | |
619 | default: | |
620 | /* No specialization */ | |
621 | break; | |
622 | } | |
623 | if (*ret) | |
624 | goto out_err; | |
625 | ||
948af1f0 MW |
626 | /* Create the raw binary file to access the entry */ |
627 | *ret = sysfs_create_bin_file(&entry->kobj, &dmi_entry_raw_attr); | |
628 | if (*ret) | |
629 | goto out_err; | |
630 | ||
631 | return; | |
632 | out_err: | |
925a1da7 | 633 | kobject_put(entry->child); |
948af1f0 MW |
634 | kobject_put(&entry->kobj); |
635 | return; | |
636 | } | |
637 | ||
638 | static void cleanup_entry_list(void) | |
639 | { | |
640 | struct dmi_sysfs_entry *entry, *next; | |
641 | ||
642 | /* No locks, we are on our way out */ | |
643 | list_for_each_entry_safe(entry, next, &entry_list, list) { | |
925a1da7 | 644 | kobject_put(entry->child); |
948af1f0 MW |
645 | kobject_put(&entry->kobj); |
646 | } | |
647 | } | |
648 | ||
649 | static int __init dmi_sysfs_init(void) | |
650 | { | |
d7f96f97 | 651 | int error; |
948af1f0 MW |
652 | int val; |
653 | ||
d7f96f97 IK |
654 | if (!dmi_kobj) { |
655 | pr_err("dmi-sysfs: dmi entry is absent.\n"); | |
656 | error = -ENODATA; | |
948af1f0 | 657 | goto err; |
d7f96f97 | 658 | } |
948af1f0 MW |
659 | |
660 | dmi_kset = kset_create_and_add("entries", NULL, dmi_kobj); | |
d7f96f97 IK |
661 | if (!dmi_kset) { |
662 | error = -ENOMEM; | |
948af1f0 | 663 | goto err; |
d7f96f97 | 664 | } |
948af1f0 MW |
665 | |
666 | val = 0; | |
667 | error = dmi_walk(dmi_sysfs_register_handle, &val); | |
668 | if (error) | |
669 | goto err; | |
670 | if (val) { | |
671 | error = val; | |
672 | goto err; | |
673 | } | |
674 | ||
675 | pr_debug("dmi-sysfs: loaded.\n"); | |
676 | ||
677 | return 0; | |
678 | err: | |
679 | cleanup_entry_list(); | |
680 | kset_unregister(dmi_kset); | |
948af1f0 MW |
681 | return error; |
682 | } | |
683 | ||
684 | /* clean up everything. */ | |
685 | static void __exit dmi_sysfs_exit(void) | |
686 | { | |
687 | pr_debug("dmi-sysfs: unloading.\n"); | |
688 | cleanup_entry_list(); | |
689 | kset_unregister(dmi_kset); | |
948af1f0 MW |
690 | } |
691 | ||
692 | module_init(dmi_sysfs_init); | |
693 | module_exit(dmi_sysfs_exit); | |
694 | ||
695 | MODULE_AUTHOR("Mike Waychison <mikew@google.com>"); | |
696 | MODULE_DESCRIPTION("DMI sysfs support"); | |
697 | MODULE_LICENSE("GPL"); |