blob: e0f1cb3d3598dab3a3c69386c73c5690b21e28cf [file] [log] [blame]
Mike Waychison948af1f2011-02-22 17:53:21 -08001/*
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
32struct dmi_sysfs_entry {
33 struct dmi_header dh;
34 struct kobject kobj;
35 int instance;
36 int position;
37 struct list_head list;
Mike Waychison925a1da2011-02-22 17:53:26 -080038 struct kobject *child;
Mike Waychison948af1f2011-02-22 17:53:21 -080039};
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 */
46static LIST_HEAD(entry_list);
47static DEFINE_SPINLOCK(entry_list_lock);
48
49/* dmi_sysfs_attribute - Top level attribute. used by all entries. */
50struct 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) \
56struct 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 */
65struct 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) \
73struct 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 *************************************************/
Mike Waychison925a1da2011-02-22 17:53:26 -080081static void dmi_entry_free(struct kobject *kobj)
82{
83 kfree(kobj);
84}
Mike Waychison948af1f2011-02-22 17:53:21 -080085
86static struct dmi_sysfs_entry *to_entry(struct kobject *kobj)
87{
88 return container_of(kobj, struct dmi_sysfs_entry, kobj);
89}
90
91static struct dmi_sysfs_attribute *to_attr(struct attribute *attr)
92{
93 return container_of(attr, struct dmi_sysfs_attribute, attr);
94}
95
96static 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
109static const struct sysfs_ops dmi_sysfs_attr_ops = {
110 .show = dmi_sysfs_attr_show,
111};
112
113typedef ssize_t (*dmi_callback)(struct dmi_sysfs_entry *,
114 const struct dmi_header *dh, void *);
115
116struct 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
124static 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() */
151struct dmi_read_state {
152 char *buf;
153 loff_t pos;
154 size_t count;
155};
156
157static 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 */
181static 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
193/*************************************************
Mike Waychison925a1da2011-02-22 17:53:26 -0800194 * Support bits for specialized DMI entry support
195 *************************************************/
196struct dmi_entry_attr_show_data {
197 struct attribute *attr;
198 char *buf;
199};
200
201static 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
213static 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
227static 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
243struct 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
Mike Waychison925a1da2011-02-22 17:53:26 -0800266#define DMI_SYSFS_SEL_FIELD(_field) \
267static ssize_t dmi_sysfs_sel_##_field(struct dmi_sysfs_entry *entry, \
268 const struct dmi_header *dh, \
269 char *buf) \
270{ \
Mike Waychison66245ad2011-02-25 15:41:49 -0800271 struct dmi_system_event_log sel; \
272 if (sizeof(sel) > dmi_entry_length(dh)) \
Mike Waychison925a1da2011-02-22 17:53:26 -0800273 return -EIO; \
Mike Waychison66245ad2011-02-25 15:41:49 -0800274 memcpy(&sel, dh, sizeof(sel)); \
275 return sprintf(buf, "%u\n", sel._field); \
Mike Waychison925a1da2011-02-22 17:53:26 -0800276} \
277static DMI_SYSFS_MAPPED_ATTR(sel, _field)
278
279DMI_SYSFS_SEL_FIELD(area_length);
280DMI_SYSFS_SEL_FIELD(header_start_offset);
281DMI_SYSFS_SEL_FIELD(data_start_offset);
282DMI_SYSFS_SEL_FIELD(access_method);
283DMI_SYSFS_SEL_FIELD(status);
284DMI_SYSFS_SEL_FIELD(change_token);
285DMI_SYSFS_SEL_FIELD(access_method_address);
286DMI_SYSFS_SEL_FIELD(header_format);
287DMI_SYSFS_SEL_FIELD(type_descriptors_supported_count);
288DMI_SYSFS_SEL_FIELD(per_log_type_descriptor_length);
289
290static 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
305static 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
Mike Waychisona3857a52011-02-22 17:53:31 -0800311typedef u8 (*sel_io_reader)(const struct dmi_system_event_log *sel,
312 loff_t offset);
313
314static DEFINE_MUTEX(io_port_lock);
315
316static 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
328static 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
341static 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
353static 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
359static 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
376static 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
397static 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;
Mike Waychison66245ad2011-02-25 15:41:49 -0800402 struct dmi_system_event_log sel;
Mike Waychisona3857a52011-02-22 17:53:31 -0800403
Mike Waychison66245ad2011-02-25 15:41:49 -0800404 if (sizeof(sel) > dmi_entry_length(dh))
Mike Waychisona3857a52011-02-22 17:53:31 -0800405 return -EIO;
406
Mike Waychison66245ad2011-02-25 15:41:49 -0800407 memcpy(&sel, dh, sizeof(sel));
408
409 switch (sel.access_method) {
Mike Waychisona3857a52011-02-22 17:53:31 -0800410 case DMI_SEL_ACCESS_METHOD_IO8:
411 case DMI_SEL_ACCESS_METHOD_IO2x8:
412 case DMI_SEL_ACCESS_METHOD_IO16:
Mike Waychison66245ad2011-02-25 15:41:49 -0800413 return dmi_sel_raw_read_io(entry, &sel, state->buf,
Mike Waychisona3857a52011-02-22 17:53:31 -0800414 state->pos, state->count);
415 case DMI_SEL_ACCESS_METHOD_PHYS32:
Mike Waychison66245ad2011-02-25 15:41:49 -0800416 return dmi_sel_raw_read_phys32(entry, &sel, state->buf,
Mike Waychisona3857a52011-02-22 17:53:31 -0800417 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",
Mike Waychison66245ad2011-02-25 15:41:49 -0800423 sel.access_method);
Mike Waychisona3857a52011-02-22 17:53:31 -0800424 return -EIO;
425 }
426}
427
428static 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
442static struct bin_attribute dmi_sel_raw_attr = {
443 .attr = {.name = "raw_event_log", .mode = 0400},
444 .read = dmi_sel_raw_read,
445};
446
Mike Waychison925a1da2011-02-22 17:53:26 -0800447static 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;
Mike Waychisona3857a52011-02-22 17:53:31 -0800460
461 ret = sysfs_create_bin_file(entry->child, &dmi_sel_raw_attr);
462 if (ret)
463 goto out_del;
464
465 return 0;
466
467out_del:
468 kobject_del(entry->child);
Mike Waychison925a1da2011-02-22 17:53:26 -0800469out_free:
470 kfree(entry->child);
471 return ret;
472}
473
474/*************************************************
Mike Waychison948af1f2011-02-22 17:53:21 -0800475 * Generic DMI entry support.
476 *************************************************/
477
478static 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
483static 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
488static 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
493static 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
499static 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
505static DMI_SYSFS_ATTR(entry, length);
506static DMI_SYSFS_ATTR(entry, handle);
507static DMI_SYSFS_ATTR(entry, type);
508static DMI_SYSFS_ATTR(entry, instance);
509static DMI_SYSFS_ATTR(entry, position);
510
511static 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
520static 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
533static 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
548static const struct bin_attribute dmi_entry_raw_attr = {
549 .attr = {.name = "raw", .mode = 0400},
550 .read = dmi_entry_raw_read,
551};
552
553static void dmi_sysfs_entry_release(struct kobject *kobj)
554{
555 struct dmi_sysfs_entry *entry = to_entry(kobj);
Bjorn Helgaasa61aca22013-12-05 16:46:28 -0700556
Mike Waychison948af1f2011-02-22 17:53:21 -0800557 spin_lock(&entry_list_lock);
558 list_del(&entry->list);
559 spin_unlock(&entry_list_lock);
560 kfree(entry);
561}
562
563static 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
569static struct kobject *dmi_kobj;
570static struct kset *dmi_kset;
571
572/* Global count of all instances seen. Only for setup */
573static int __initdata instance_counts[MAX_ENTRY_TYPE + 1];
574
575/* Global positional count of all entries seen. Only for setup */
576static int __initdata position_count;
577
578static 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 */
Mike Waychison66245ad2011-02-25 15:41:49 -0800596 memcpy(&entry->dh, dh, sizeof(*dh));
Mike Waychison948af1f2011-02-22 17:53:21 -0800597 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
Mike Waychison925a1da2011-02-22 17:53:26 -0800614 /* 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
Mike Waychison948af1f2011-02-22 17:53:21 -0800626 /* 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;
632out_err:
Mike Waychison925a1da2011-02-22 17:53:26 -0800633 kobject_put(entry->child);
Mike Waychison948af1f2011-02-22 17:53:21 -0800634 kobject_put(&entry->kobj);
635 return;
636}
637
638static 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) {
Mike Waychison925a1da2011-02-22 17:53:26 -0800644 kobject_put(entry->child);
Mike Waychison948af1f2011-02-22 17:53:21 -0800645 kobject_put(&entry->kobj);
646 }
647}
648
649static int __init dmi_sysfs_init(void)
650{
651 int error = -ENOMEM;
652 int val;
653
654 /* Set up our directory */
655 dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
656 if (!dmi_kobj)
657 goto err;
658
659 dmi_kset = kset_create_and_add("entries", NULL, dmi_kobj);
660 if (!dmi_kset)
661 goto err;
662
663 val = 0;
664 error = dmi_walk(dmi_sysfs_register_handle, &val);
665 if (error)
666 goto err;
667 if (val) {
668 error = val;
669 goto err;
670 }
671
672 pr_debug("dmi-sysfs: loaded.\n");
673
674 return 0;
675err:
676 cleanup_entry_list();
677 kset_unregister(dmi_kset);
678 kobject_put(dmi_kobj);
679 return error;
680}
681
682/* clean up everything. */
683static void __exit dmi_sysfs_exit(void)
684{
685 pr_debug("dmi-sysfs: unloading.\n");
686 cleanup_entry_list();
687 kset_unregister(dmi_kset);
Bjorn Helgaasd0f80f92013-12-05 16:46:35 -0700688 kobject_del(dmi_kobj);
Mike Waychison948af1f2011-02-22 17:53:21 -0800689 kobject_put(dmi_kobj);
690}
691
692module_init(dmi_sysfs_init);
693module_exit(dmi_sysfs_exit);
694
695MODULE_AUTHOR("Mike Waychison <mikew@google.com>");
696MODULE_DESCRIPTION("DMI sysfs support");
697MODULE_LICENSE("GPL");