summaryrefslogtreecommitdiffstats
path: root/drivers/platform/x86/dell/dell-smbios-base.c
blob: b562ed99ec4e7964d83dfbbab688299be47dd839 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Common functions for kernel modules using Dell SMBIOS
 *
 *  Copyright (c) Red Hat <mjg@redhat.com>
 *  Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
 *  Copyright (c) 2014 Pali Rohár <pali@kernel.org>
 *
 *  Based on documentation in the libsmbios package:
 *  Copyright (C) 2005-2014 Dell Inc.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/container_of.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/capability.h>
#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "dell-smbios.h"

static u32 da_supported_commands;
static int da_num_tokens;
static struct platform_device *platform_device;
static struct calling_interface_token *da_tokens;
static struct token_sysfs_data *token_entries;
static struct attribute **token_attrs;
static DEFINE_MUTEX(smbios_mutex);

struct token_sysfs_data {
	struct device_attribute location_attr;
	struct device_attribute value_attr;
	struct calling_interface_token *token;
};

struct smbios_device {
	struct list_head list;
	struct device *device;
	int (*call_fn)(struct calling_interface_buffer *arg);
};

struct smbios_call {
	u32 need_capability;
	int cmd_class;
	int cmd_select;
};

/* calls that are whitelisted for given capabilities */
static struct smbios_call call_whitelist[] = {
	/* generally tokens are allowed, but may be further filtered or
	 * restricted by token blacklist or whitelist
	 */
	{CAP_SYS_ADMIN,	CLASS_TOKEN_READ,	SELECT_TOKEN_STD},
	{CAP_SYS_ADMIN,	CLASS_TOKEN_READ,	SELECT_TOKEN_AC},
	{CAP_SYS_ADMIN,	CLASS_TOKEN_READ,	SELECT_TOKEN_BAT},
	{CAP_SYS_ADMIN,	CLASS_TOKEN_WRITE,	SELECT_TOKEN_STD},
	{CAP_SYS_ADMIN,	CLASS_TOKEN_WRITE,	SELECT_TOKEN_AC},
	{CAP_SYS_ADMIN,	CLASS_TOKEN_WRITE,	SELECT_TOKEN_BAT},
	/* used by userspace: fwupdate */
	{CAP_SYS_ADMIN, CLASS_ADMIN_PROP,	SELECT_ADMIN_PROP},
	/* used by userspace: fwupd */
	{CAP_SYS_ADMIN,	CLASS_INFO,		SELECT_DOCK},
	{CAP_SYS_ADMIN,	CLASS_FLASH_INTERFACE,	SELECT_FLASH_INTERFACE},
};

/* calls that are explicitly blacklisted */
static struct smbios_call call_blacklist[] = {
	{0x0000,  1,  7}, /* manufacturing use */
	{0x0000,  6,  5}, /* manufacturing use */
	{0x0000, 11,  3}, /* write once */
	{0x0000, 11,  7}, /* write once */
	{0x0000, 11, 11}, /* write once */
	{0x0000, 19, -1}, /* diagnostics */
	/* handled by kernel: dell-laptop */
	{0x0000, CLASS_INFO, SELECT_RFKILL},
	{0x0000, CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT},
};

struct token_range {
	u32 need_capability;
	u16 min;
	u16 max;
};

/* tokens that are whitelisted for given capabilities */
static struct token_range token_whitelist[] = {
	/* used by userspace: fwupdate */
	{CAP_SYS_ADMIN,	CAPSULE_EN_TOKEN,	CAPSULE_DIS_TOKEN},
	/* can indicate to userspace that WMI is needed */
	{0x0000,	WSMT_EN_TOKEN,		WSMT_DIS_TOKEN}
};

/* tokens that are explicitly blacklisted */
static struct token_range token_blacklist[] = {
	{0x0000, 0x0058, 0x0059}, /* ME use */
	{0x0000, 0x00CD, 0x00D0}, /* raid shadow copy */
	{0x0000, 0x013A, 0x01FF}, /* sata shadow copy */
	{0x0000, 0x0175, 0x0176}, /* write once */
	{0x0000, 0x0195, 0x0197}, /* diagnostics */
	{0x0000, 0x01DC, 0x01DD}, /* manufacturing use */
	{0x0000, 0x027D, 0x0284}, /* diagnostics */
	{0x0000, 0x02E3, 0x02E3}, /* manufacturing use */
	{0x0000, 0x02FF, 0x02FF}, /* manufacturing use */
	{0x0000, 0x0300, 0x0302}, /* manufacturing use */
	{0x0000, 0x0325, 0x0326}, /* manufacturing use */
	{0x0000, 0x0332, 0x0335}, /* fan control */
	{0x0000, 0x0350, 0x0350}, /* manufacturing use */
	{0x0000, 0x0363, 0x0363}, /* manufacturing use */
	{0x0000, 0x0368, 0x0368}, /* manufacturing use */
	{0x0000, 0x03F6, 0x03F7}, /* manufacturing use */
	{0x0000, 0x049E, 0x049F}, /* manufacturing use */
	{0x0000, 0x04A0, 0x04A3}, /* disagnostics */
	{0x0000, 0x04E6, 0x04E7}, /* manufacturing use */
	{0x0000, 0x4000, 0x7FFF}, /* internal BIOS use */
	{0x0000, 0x9000, 0x9001}, /* internal BIOS use */
	{0x0000, 0xA000, 0xBFFF}, /* write only */
	{0x0000, 0xEFF0, 0xEFFF}, /* internal BIOS use */
	/* handled by kernel: dell-laptop */
	{0x0000, BRIGHTNESS_TOKEN,	BRIGHTNESS_TOKEN},
	{0x0000, KBD_LED_OFF_TOKEN,	KBD_LED_AUTO_TOKEN},
	{0x0000, KBD_LED_AC_TOKEN,	KBD_LED_AC_TOKEN},
	{0x0000, KBD_LED_AUTO_25_TOKEN,	KBD_LED_AUTO_75_TOKEN},
	{0x0000, KBD_LED_AUTO_100_TOKEN,	KBD_LED_AUTO_100_TOKEN},
	{0x0000, GLOBAL_MIC_MUTE_ENABLE,	GLOBAL_MIC_MUTE_DISABLE},
};

static LIST_HEAD(smbios_device_list);

int dell_smbios_error(int value)
{
	switch (value) {
	case 0: /* Completed successfully */
		return 0;
	case -1: /* Completed with error */
		return -EIO;
	case -2: /* Function not supported */
		return -ENXIO;
	default: /* Unknown error */
		return -EINVAL;
	}
}
EXPORT_SYMBOL_GPL(dell_smbios_error);

int dell_smbios_register_device(struct device *d, void *call_fn)
{
	struct smbios_device *priv;

	priv = devm_kzalloc(d, sizeof(struct smbios_device), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;
	get_device(d);
	priv->device = d;
	priv->call_fn = call_fn;
	mutex_lock(&smbios_mutex);
	list_add_tail(&priv->list, &smbios_device_list);
	mutex_unlock(&smbios_mutex);
	dev_dbg(d, "Added device: %s\n", d->driver->name);
	return 0;
}
EXPORT_SYMBOL_GPL(dell_smbios_register_device);

void dell_smbios_unregister_device(struct device *d)
{
	struct smbios_device *priv;

	mutex_lock(&smbios_mutex);
	list_for_each_entry(priv, &smbios_device_list, list) {
		if (priv->device == d) {
			list_del(&priv->list);
			put_device(d);
			break;
		}
	}
	mutex_unlock(&smbios_mutex);
	dev_dbg(d, "Remove device: %s\n", d->driver->name);
}
EXPORT_SYMBOL_GPL(dell_smbios_unregister_device);

int dell_smbios_call_filter(struct device *d,
			    struct calling_interface_buffer *buffer)
{
	u16 t = 0;
	int i;

	/* can't make calls over 30 */
	if (buffer->cmd_class > 30) {
		dev_dbg(d, "class too big: %u\n", buffer->cmd_class);
		return -EINVAL;
	}

	/* supported calls on the particular system */
	if (!(da_supported_commands & (1 << buffer->cmd_class))) {
		dev_dbg(d, "invalid command, supported commands: 0x%8x\n",
			da_supported_commands);
		return -EINVAL;
	}

	/* match against call blacklist  */
	for (i = 0; i < ARRAY_SIZE(call_blacklist); i++) {
		if (buffer->cmd_class != call_blacklist[i].cmd_class)
			continue;
		if (buffer->cmd_select != call_blacklist[i].cmd_select &&
		    call_blacklist[i].cmd_select != -1)
			continue;
		dev_dbg(d, "blacklisted command: %u/%u\n",
			buffer->cmd_class, buffer->cmd_select);
		return -EINVAL;
	}

	/* if a token call, find token ID */

	if ((buffer->cmd_class == CLASS_TOKEN_READ ||
	     buffer->cmd_class == CLASS_TOKEN_WRITE) &&
	     buffer->cmd_select < 3) {
		/* tokens enabled ? */
		if (!da_tokens) {
			dev_dbg(d, "no token support on this system\n");
			return -EINVAL;
		}

		/* find the matching token ID */
		for (i = 0; i < da_num_tokens; i++) {
			if (da_tokens[i].location != buffer->input[0])
				continue;
			t = da_tokens[i].tokenID;
			break;
		}

		/* token call; but token didn't exist */
		if (!t) {
			dev_dbg(d, "token at location %04x doesn't exist\n",
				buffer->input[0]);
			return -EINVAL;
		}

		/* match against token blacklist */
		for (i = 0; i < ARRAY_SIZE(token_blacklist); i++) {
			if (!token_blacklist[i].min || !token_blacklist[i].max)
				continue;
			if (t >= token_blacklist[i].min &&
			    t <= token_blacklist[i].max)
				return -EINVAL;
		}

		/* match against token whitelist */
		for (i = 0; i < ARRAY_SIZE(token_whitelist); i++) {
			if (!token_whitelist[i].min || !token_whitelist[i].max)
				continue;
			if (t < token_whitelist[i].min ||
			    t > token_whitelist[i].max)
				continue;
			if (!token_whitelist[i].need_capability ||
			    capable(token_whitelist[i].need_capability)) {
				dev_dbg(d, "whitelisted token: %x\n", t);
				return 0;
			}

		}
	}
	/* match against call whitelist */
	for (i = 0; i < ARRAY_SIZE(call_whitelist); i++) {
		if (buffer->cmd_class != call_whitelist[i].cmd_class)
			continue;
		if (buffer->cmd_select != call_whitelist[i].cmd_select)
			continue;
		if (!call_whitelist[i].need_capability ||
		    capable(call_whitelist[i].need_capability)) {
			dev_dbg(d, "whitelisted capable command: %u/%u\n",
			buffer->cmd_class, buffer->cmd_select);
			return 0;
		}
		dev_dbg(d, "missing capability %d for %u/%u\n",
			call_whitelist[i].need_capability,
			buffer->cmd_class, buffer->cmd_select);

	}

	/* not in a whitelist, only allow processes with capabilities */
	if (capable(CAP_SYS_RAWIO)) {
		dev_dbg(d, "Allowing %u/%u due to CAP_SYS_RAWIO\n",
			buffer->cmd_class, buffer->cmd_select);
		return 0;
	}

	return -EACCES;
}
EXPORT_SYMBOL_GPL(dell_smbios_call_filter);

int dell_smbios_call(struct calling_interface_buffer *buffer)
{
	int (*call_fn)(struct calling_interface_buffer *) = NULL;
	struct device *selected_dev = NULL;
	struct smbios_device *priv;
	int ret;

	mutex_lock(&smbios_mutex);
	list_for_each_entry(priv, &smbios_device_list, list) {
		if (!selected_dev || priv->device->id >= selected_dev->id) {
			dev_dbg(priv->device, "Trying device ID: %d\n",
				priv->device->id);
			call_fn = priv->call_fn;
			selected_dev = priv->device;
		}
	}

	if (!selected_dev) {
		ret = -ENODEV;
		pr_err("No dell-smbios drivers are loaded\n");
		goto out_smbios_call;
	}

	ret = call_fn(buffer);

out_smbios_call:
	mutex_unlock(&smbios_mutex);
	return ret;
}
EXPORT_SYMBOL_GPL(dell_smbios_call);

struct calling_interface_token *dell_smbios_find_token(int tokenid)
{
	int i;

	if (!da_tokens)
		return NULL;

	for (i = 0; i < da_num_tokens; i++) {
		if (da_tokens[i].tokenID == tokenid)
			return &da_tokens[i];
	}

	return NULL;
}
EXPORT_SYMBOL_GPL(dell_smbios_find_token);

static BLOCKING_NOTIFIER_HEAD(dell_laptop_chain_head);

int dell_laptop_register_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&dell_laptop_chain_head, nb);
}
EXPORT_SYMBOL_GPL(dell_laptop_register_notifier);

int dell_laptop_unregister_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&dell_laptop_chain_head, nb);
}
EXPORT_SYMBOL_GPL(dell_laptop_unregister_notifier);

void dell_laptop_call_notifier(unsigned long action, void *data)
{
	blocking_notifier_call_chain(&dell_laptop_chain_head, action, data);
}
EXPORT_SYMBOL_GPL(dell_laptop_call_notifier);

static void __init parse_da_table(const struct dmi_header *dm)
{
	/* Final token is a terminator, so we don't want to copy it */
	int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
	struct calling_interface_token *new_da_tokens;
	struct calling_interface_structure *table =
		container_of(dm, struct calling_interface_structure, header);

	/*
	 * 4 bytes of table header, plus 7 bytes of Dell header
	 * plus at least 6 bytes of entry
	 */

	if (dm->length < 17)
		return;

	da_supported_commands = table->supportedCmds;

	new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
				 sizeof(struct calling_interface_token),
				 GFP_KERNEL);

	if (!new_da_tokens)
		return;
	da_tokens = new_da_tokens;

	memcpy(da_tokens+da_num_tokens, table->tokens,
	       sizeof(struct calling_interface_token) * tokens);

	da_num_tokens += tokens;
}

static void zero_duplicates(struct device *dev)
{
	int i, j;

	for (i = 0; i < da_num_tokens; i++) {
		if (da_tokens[i].tokenID == 0)
			continue;
		for (j = i+1; j < da_num_tokens; j++) {
			if (da_tokens[j].tokenID == 0)
				continue;
			if (da_tokens[i].tokenID == da_tokens[j].tokenID) {
				dev_dbg(dev, "Zeroing dup token ID %x(%x/%x)\n",
					da_tokens[j].tokenID,
					da_tokens[j].location,
					da_tokens[j].value);
				da_tokens[j].tokenID = 0;
			}
		}
	}
}

static void __init find_tokens(const struct dmi_header *dm, void *dummy)
{
	switch (dm->type) {
	case 0xd4: /* Indexed IO */
	case 0xd5: /* Protected Area Type 1 */
	case 0xd6: /* Protected Area Type 2 */
		break;
	case 0xda: /* Calling interface */
		parse_da_table(dm);
		break;
	}
}

static ssize_t location_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct token_sysfs_data *data = container_of(attr, struct token_sysfs_data, location_attr);

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	return sysfs_emit(buf, "%08x", data->token->location);
}

static ssize_t value_show(struct device *dev,
			  struct device_attribute *attr, char *buf)
{
	struct token_sysfs_data *data = container_of(attr, struct token_sysfs_data, value_attr);

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	return sysfs_emit(buf, "%08x", data->token->value);
}

static struct attribute_group smbios_attribute_group = {
	.name = "tokens"
};

static struct platform_driver platform_driver = {
	.driver = {
		.name = "dell-smbios",
	},
};

static int build_tokens_sysfs(struct platform_device *dev)
{
	char *location_name;
	char *value_name;
	int ret;
	int i, j;

	token_entries = kcalloc(da_num_tokens, sizeof(*token_entries), GFP_KERNEL);
	if (!token_entries)
		return -ENOMEM;

	/* need to store both location and value + terminator*/
	token_attrs = kcalloc((2 * da_num_tokens) + 1, sizeof(*token_attrs), GFP_KERNEL);
	if (!token_attrs)
		goto out_allocate_attrs;

	for (i = 0, j = 0; i < da_num_tokens; i++) {
		/* skip empty */
		if (da_tokens[i].tokenID == 0)
			continue;

		token_entries[i].token = &da_tokens[i];

		/* add location */
		location_name = kasprintf(GFP_KERNEL, "%04x_location",
					  da_tokens[i].tokenID);
		if (location_name == NULL)
			goto out_unwind_strings;

		sysfs_attr_init(&token_entries[i].location_attr.attr);
		token_entries[i].location_attr.attr.name = location_name;
		token_entries[i].location_attr.attr.mode = 0444;
		token_entries[i].location_attr.show = location_show;
		token_attrs[j++] = &token_entries[i].location_attr.attr;

		/* add value */
		value_name = kasprintf(GFP_KERNEL, "%04x_value",
				       da_tokens[i].tokenID);
		if (!value_name) {
			kfree(location_name);
			goto out_unwind_strings;
		}

		sysfs_attr_init(&token_entries[i].value_attr.attr);
		token_entries[i].value_attr.attr.name = value_name;
		token_entries[i].value_attr.attr.mode = 0444;
		token_entries[i].value_attr.show = value_show;
		token_attrs[j++] = &token_entries[i].value_attr.attr;
	}
	smbios_attribute_group.attrs = token_attrs;

	ret = sysfs_create_group(&dev->dev.kobj, &smbios_attribute_group);
	if (ret)
		goto out_unwind_strings;
	return 0;

out_unwind_strings:
	while (i--) {
		kfree(token_entries[i].location_attr.attr.name);
		kfree(token_entries[i].value_attr.attr.name);
	}
	kfree(token_attrs);
out_allocate_attrs:
	kfree(token_entries);

	return -ENOMEM;
}

static void free_group(struct platform_device *pdev)
{
	int i;

	sysfs_remove_group(&pdev->dev.kobj,
				&smbios_attribute_group);
	for (i = 0; i < da_num_tokens; i++) {
		kfree(token_entries[i].location_attr.attr.name);
		kfree(token_entries[i].value_attr.attr.name);
	}
	kfree(token_attrs);
	kfree(token_entries);
}

static int __init dell_smbios_init(void)
{
	int ret, wmi, smm;

	if (!dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "Dell System", NULL) &&
	    !dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "www.dell.com", NULL)) {
		pr_err("Unable to run on non-Dell system\n");
		return -ENODEV;
	}

	dmi_walk(find_tokens, NULL);

	ret = platform_driver_register(&platform_driver);
	if (ret)
		goto fail_platform_driver;

	platform_device = platform_device_alloc("dell-smbios", 0);
	if (!platform_device) {
		ret = -ENOMEM;
		goto fail_platform_device_alloc;
	}
	ret = platform_device_add(platform_device);
	if (ret)
		goto fail_platform_device_add;

	/* register backends */
	wmi = init_dell_smbios_wmi();
	if (wmi)
		pr_debug("Failed to initialize WMI backend: %d\n", wmi);
	smm = init_dell_smbios_smm();
	if (smm)
		pr_debug("Failed to initialize SMM backend: %d\n", smm);
	if (wmi && smm) {
		pr_err("No SMBIOS backends available (wmi: %d, smm: %d)\n",
			wmi, smm);
		ret = -ENODEV;
		goto fail_create_group;
	}

	if (da_tokens)  {
		/* duplicate tokens will cause problems building sysfs files */
		zero_duplicates(&platform_device->dev);

		ret = build_tokens_sysfs(platform_device);
		if (ret)
			goto fail_sysfs;
	}

	return 0;

fail_sysfs:
	free_group(platform_device);

fail_create_group:
	platform_device_del(platform_device);

fail_platform_device_add:
	platform_device_put(platform_device);

fail_platform_device_alloc:
	platform_driver_unregister(&platform_driver);

fail_platform_driver:
	kfree(da_tokens);
	return ret;
}

static void __exit dell_smbios_exit(void)
{
	exit_dell_smbios_wmi();
	exit_dell_smbios_smm();
	mutex_lock(&smbios_mutex);
	if (platform_device) {
		if (da_tokens)
			free_group(platform_device);
		platform_device_unregister(platform_device);
		platform_driver_unregister(&platform_driver);
	}
	kfree(da_tokens);
	mutex_unlock(&smbios_mutex);
}

module_init(dell_smbios_init);
module_exit(dell_smbios_exit);

MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
MODULE_AUTHOR("Mario Limonciello <mario.limonciello@outlook.com>");
MODULE_DESCRIPTION("Common functions for kernel modules using Dell SMBIOS");
MODULE_LICENSE("GPL");