summaryrefslogtreecommitdiffstats
path: root/drivers/char/tpm/tpm_crb.c
blob: a4ac63a21d8a051da3c336f5343b9dc72574b719 (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
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
/*
 * Copyright (C) 2014 Intel Corporation
 *
 * Authors:
 * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
 *
 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
 *
 * This device driver implements the TPM interface as defined in
 * the TCG CRB 2.0 TPM specification.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 */

#include <linux/acpi.h>
#include <linux/highmem.h>
#include <linux/rculist.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#ifdef CONFIG_ARM64
#include <linux/arm-smccc.h>
#endif
#include "tpm.h"

#define ACPI_SIG_TPM2 "TPM2"

static const guid_t crb_acpi_start_guid =
	GUID_INIT(0x6BBF6CAB, 0x5463, 0x4714,
		  0xB7, 0xCD, 0xF0, 0x20, 0x3C, 0x03, 0x68, 0xD4);

enum crb_defaults {
	CRB_ACPI_START_REVISION_ID = 1,
	CRB_ACPI_START_INDEX = 1,
};

enum crb_loc_ctrl {
	CRB_LOC_CTRL_REQUEST_ACCESS	= BIT(0),
	CRB_LOC_CTRL_RELINQUISH		= BIT(1),
};

enum crb_loc_state {
	CRB_LOC_STATE_LOC_ASSIGNED	= BIT(1),
	CRB_LOC_STATE_TPM_REG_VALID_STS	= BIT(7),
};

enum crb_ctrl_req {
	CRB_CTRL_REQ_CMD_READY	= BIT(0),
	CRB_CTRL_REQ_GO_IDLE	= BIT(1),
};

enum crb_ctrl_sts {
	CRB_CTRL_STS_ERROR	= BIT(0),
	CRB_CTRL_STS_TPM_IDLE	= BIT(1),
};

enum crb_start {
	CRB_START_INVOKE	= BIT(0),
};

enum crb_cancel {
	CRB_CANCEL_INVOKE	= BIT(0),
};

struct crb_regs_head {
	u32 loc_state;
	u32 reserved1;
	u32 loc_ctrl;
	u32 loc_sts;
	u8 reserved2[32];
	u64 intf_id;
	u64 ctrl_ext;
} __packed;

struct crb_regs_tail {
	u32 ctrl_req;
	u32 ctrl_sts;
	u32 ctrl_cancel;
	u32 ctrl_start;
	u32 ctrl_int_enable;
	u32 ctrl_int_sts;
	u32 ctrl_cmd_size;
	u32 ctrl_cmd_pa_low;
	u32 ctrl_cmd_pa_high;
	u32 ctrl_rsp_size;
	u64 ctrl_rsp_pa;
} __packed;

enum crb_status {
	CRB_DRV_STS_COMPLETE	= BIT(0),
};

enum crb_flags {
	CRB_FL_ACPI_START	= BIT(0),
	CRB_FL_CRB_START	= BIT(1),
	CRB_FL_CRB_SMC_START	= BIT(2),
};

struct crb_priv {
	unsigned int flags;
	void __iomem *iobase;
	struct crb_regs_head __iomem *regs_h;
	struct crb_regs_tail __iomem *regs_t;
	u8 __iomem *cmd;
	u8 __iomem *rsp;
	u32 cmd_size;
	u32 smc_func_id;
};

struct tpm2_crb_smc {
	u32 interrupt;
	u8 interrupt_flags;
	u8 op_flags;
	u16 reserved2;
	u32 smc_func_id;
};

/**
 * crb_go_idle - request tpm crb device to go the idle state
 *
 * @dev:  crb device
 * @priv: crb private data
 *
 * Write CRB_CTRL_REQ_GO_IDLE to TPM_CRB_CTRL_REQ
 * The device should respond within TIMEOUT_C by clearing the bit.
 * Anyhow, we do not wait here as a consequent CMD_READY request
 * will be handled correctly even if idle was not completed.
 *
 * The function does nothing for devices with ACPI-start method.
 *
 * Return: 0 always
 */
static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv *priv)
{
	if ((priv->flags & CRB_FL_ACPI_START) ||
	    (priv->flags & CRB_FL_CRB_SMC_START))
		return 0;

	iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->regs_t->ctrl_req);
	/* we don't really care when this settles */

	return 0;
}

static bool crb_wait_for_reg_32(u32 __iomem *reg, u32 mask, u32 value,
				unsigned long timeout)
{
	ktime_t start;
	ktime_t stop;

	start = ktime_get();
	stop = ktime_add(start, ms_to_ktime(timeout));

	do {
		if ((ioread32(reg) & mask) == value)
			return true;

		usleep_range(50, 100);
	} while (ktime_before(ktime_get(), stop));

	return false;
}

/**
 * crb_cmd_ready - request tpm crb device to enter ready state
 *
 * @dev:  crb device
 * @priv: crb private data
 *
 * Write CRB_CTRL_REQ_CMD_READY to TPM_CRB_CTRL_REQ
 * and poll till the device acknowledge it by clearing the bit.
 * The device should respond within TIMEOUT_C.
 *
 * The function does nothing for devices with ACPI-start method
 *
 * Return: 0 on success -ETIME on timeout;
 */
static int __maybe_unused crb_cmd_ready(struct device *dev,
					struct crb_priv *priv)
{
	if ((priv->flags & CRB_FL_ACPI_START) ||
	    (priv->flags & CRB_FL_CRB_SMC_START))
		return 0;

	iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->regs_t->ctrl_req);
	if (!crb_wait_for_reg_32(&priv->regs_t->ctrl_req,
				 CRB_CTRL_REQ_CMD_READY /* mask */,
				 0, /* value */
				 TPM2_TIMEOUT_C)) {
		dev_warn(dev, "cmdReady timed out\n");
		return -ETIME;
	}

	return 0;
}

static int crb_request_locality(struct tpm_chip *chip, int loc)
{
	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
	u32 value = CRB_LOC_STATE_LOC_ASSIGNED |
		CRB_LOC_STATE_TPM_REG_VALID_STS;

	if (!priv->regs_h)
		return 0;

	iowrite32(CRB_LOC_CTRL_REQUEST_ACCESS, &priv->regs_h->loc_ctrl);
	if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, value, value,
				 TPM2_TIMEOUT_C)) {
		dev_warn(&chip->dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
		return -ETIME;
	}

	return 0;
}

static void crb_relinquish_locality(struct tpm_chip *chip, int loc)
{
	struct crb_priv *priv = dev_get_drvdata(&chip->dev);

	if (!priv->regs_h)
		return;

	iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl);
}

static u8 crb_status(struct tpm_chip *chip)
{
	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
	u8 sts = 0;

	if ((ioread32(&priv->regs_t->ctrl_start) & CRB_START_INVOKE) !=
	    CRB_START_INVOKE)
		sts |= CRB_DRV_STS_COMPLETE;

	return sts;
}

static int crb_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
	unsigned int expected;

	/* sanity check */
	if (count < 6)
		return -EIO;

	if (ioread32(&priv->regs_t->ctrl_sts) & CRB_CTRL_STS_ERROR)
		return -EIO;

	memcpy_fromio(buf, priv->rsp, 6);
	expected = be32_to_cpup((__be32 *) &buf[2]);
	if (expected > count || expected < 6)
		return -EIO;

	memcpy_fromio(&buf[6], &priv->rsp[6], expected - 6);

	return expected;
}

static int crb_do_acpi_start(struct tpm_chip *chip)
{
	union acpi_object *obj;
	int rc;

	obj = acpi_evaluate_dsm(chip->acpi_dev_handle,
				&crb_acpi_start_guid,
				CRB_ACPI_START_REVISION_ID,
				CRB_ACPI_START_INDEX,
				NULL);
	if (!obj)
		return -ENXIO;
	rc = obj->integer.value == 0 ? 0 : -ENXIO;
	ACPI_FREE(obj);
	return rc;
}

#ifdef CONFIG_ARM64
/*
 * This is a TPM Command Response Buffer start method that invokes a
 * Secure Monitor Call to requrest the firmware to execute or cancel
 * a TPM 2.0 command.
 */
static int tpm_crb_smc_start(struct device *dev, unsigned long func_id)
{
	struct arm_smccc_res res;

	arm_smccc_smc(func_id, 0, 0, 0, 0, 0, 0, 0, &res);
	if (res.a0 != 0) {
		dev_err(dev,
			FW_BUG "tpm_crb_smc_start() returns res.a0 = 0x%lx\n",
			res.a0);
		return -EIO;
	}

	return 0;
}
#else
static int tpm_crb_smc_start(struct device *dev, unsigned long func_id)
{
	dev_err(dev, FW_BUG "tpm_crb: incorrect start method\n");
	return -EINVAL;
}
#endif

static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
{
	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
	int rc = 0;

	/* Zero the cancel register so that the next command will not get
	 * canceled.
	 */
	iowrite32(0, &priv->regs_t->ctrl_cancel);

	if (len > priv->cmd_size) {
		dev_err(&chip->dev, "invalid command count value %zd %d\n",
			len, priv->cmd_size);
		return -E2BIG;
	}

	memcpy_toio(priv->cmd, buf, len);

	/* Make sure that cmd is populated before issuing start. */
	wmb();

	if (priv->flags & CRB_FL_CRB_START)
		iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start);

	if (priv->flags & CRB_FL_ACPI_START)
		rc = crb_do_acpi_start(chip);

	if (priv->flags & CRB_FL_CRB_SMC_START) {
		iowrite32(CRB_START_INVOKE, &priv->regs_t->ctrl_start);
		rc = tpm_crb_smc_start(&chip->dev, priv->smc_func_id);
	}

	return rc;
}

static void crb_cancel(struct tpm_chip *chip)
{
	struct crb_priv *priv = dev_get_drvdata(&chip->dev);

	iowrite32(CRB_CANCEL_INVOKE, &priv->regs_t->ctrl_cancel);

	if ((priv->flags & CRB_FL_ACPI_START) && crb_do_acpi_start(chip))
		dev_err(&chip->dev, "ACPI Start failed\n");
}

static bool crb_req_canceled(struct tpm_chip *chip, u8 status)
{
	struct crb_priv *priv = dev_get_drvdata(&chip->dev);
	u32 cancel = ioread32(&priv->regs_t->ctrl_cancel);

	return (cancel & CRB_CANCEL_INVOKE) == CRB_CANCEL_INVOKE;
}

static const struct tpm_class_ops tpm_crb = {
	.flags = TPM_OPS_AUTO_STARTUP,
	.status = crb_status,
	.recv = crb_recv,
	.send = crb_send,
	.cancel = crb_cancel,
	.req_canceled = crb_req_canceled,
	.request_locality = crb_request_locality,
	.relinquish_locality = crb_relinquish_locality,
	.req_complete_mask = CRB_DRV_STS_COMPLETE,
	.req_complete_val = CRB_DRV_STS_COMPLETE,
};

static int crb_check_resource(struct acpi_resource *ares, void *data)
{
	struct resource *io_res = data;
	struct resource_win win;
	struct resource *res = &(win.res);

	if (acpi_dev_resource_memory(ares, res) ||
	    acpi_dev_resource_address_space(ares, &win)) {
		*io_res = *res;
		io_res->name = NULL;
	}

	return 1;
}

static void __iomem *crb_map_res(struct device *dev, struct crb_priv *priv,
				 struct resource *io_res, u64 start, u32 size)
{
	struct resource new_res = {
		.start	= start,
		.end	= start + size - 1,
		.flags	= IORESOURCE_MEM,
	};

	/* Detect a 64 bit address on a 32 bit system */
	if (start != new_res.start)
		return (void __iomem *) ERR_PTR(-EINVAL);

	if (!resource_contains(io_res, &new_res))
		return devm_ioremap_resource(dev, &new_res);

	return priv->iobase + (new_res.start - io_res->start);
}

/*
 * Work around broken BIOSs that return inconsistent values from the ACPI
 * region vs the registers. Trust the ACPI region. Such broken systems
 * probably cannot send large TPM commands since the buffer will be truncated.
 */
static u64 crb_fixup_cmd_size(struct device *dev, struct resource *io_res,
			      u64 start, u64 size)
{
	if (io_res->start > start || io_res->end < start)
		return size;

	if (start + size - 1 <= io_res->end)
		return size;

	dev_err(dev,
		FW_BUG "ACPI region does not cover the entire command/response buffer. %pr vs %llx %llx\n",
		io_res, start, size);

	return io_res->end - start + 1;
}

static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
		      struct acpi_table_tpm2 *buf)
{
	struct list_head resources;
	struct resource io_res;
	struct device *dev = &device->dev;
	u32 pa_high, pa_low;
	u64 cmd_pa;
	u32 cmd_size;
	u64 rsp_pa;
	u32 rsp_size;
	int ret;

	INIT_LIST_HEAD(&resources);
	ret = acpi_dev_get_resources(device, &resources, crb_check_resource,
				     &io_res);
	if (ret < 0)
		return ret;
	acpi_dev_free_resource_list(&resources);

	if (resource_type(&io_res) != IORESOURCE_MEM) {
		dev_err(dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n");
		return -EINVAL;
	}

	priv->iobase = devm_ioremap_resource(dev, &io_res);
	if (IS_ERR(priv->iobase))
		return PTR_ERR(priv->iobase);

	/* The ACPI IO region starts at the head area and continues to include
	 * the control area, as one nice sane region except for some older
	 * stuff that puts the control area outside the ACPI IO region.
	 */
	if (!(priv->flags & CRB_FL_ACPI_START)) {
		if (buf->control_address == io_res.start +
		    sizeof(*priv->regs_h))
			priv->regs_h = priv->iobase;
		else
			dev_warn(dev, FW_BUG "Bad ACPI memory layout");
	}

	priv->regs_t = crb_map_res(dev, priv, &io_res, buf->control_address,
				   sizeof(struct crb_regs_tail));
	if (IS_ERR(priv->regs_t))
		return PTR_ERR(priv->regs_t);

	/*
	 * PTT HW bug w/a: wake up the device to access
	 * possibly not retained registers.
	 */
	ret = crb_cmd_ready(dev, priv);
	if (ret)
		return ret;

	pa_high = ioread32(&priv->regs_t->ctrl_cmd_pa_high);
	pa_low  = ioread32(&priv->regs_t->ctrl_cmd_pa_low);
	cmd_pa = ((u64)pa_high << 32) | pa_low;
	cmd_size = crb_fixup_cmd_size(dev, &io_res, cmd_pa,
				      ioread32(&priv->regs_t->ctrl_cmd_size));

	dev_dbg(dev, "cmd_hi = %X cmd_low = %X cmd_size %X\n",
		pa_high, pa_low, cmd_size);

	priv->cmd = crb_map_res(dev, priv, &io_res, cmd_pa, cmd_size);
	if (IS_ERR(priv->cmd)) {
		ret = PTR_ERR(priv->cmd);
		goto out;
	}

	memcpy_fromio(&rsp_pa, &priv->regs_t->ctrl_rsp_pa, 8);
	rsp_pa = le64_to_cpu(rsp_pa);
	rsp_size = crb_fixup_cmd_size(dev, &io_res, rsp_pa,
				      ioread32(&priv->regs_t->ctrl_rsp_size));

	if (cmd_pa != rsp_pa) {
		priv->rsp = crb_map_res(dev, priv, &io_res, rsp_pa, rsp_size);
		ret = PTR_ERR_OR_ZERO(priv->rsp);
		goto out;
	}

	/* According to the PTP specification, overlapping command and response
	 * buffer sizes must be identical.
	 */
	if (cmd_size != rsp_size) {
		dev_err(dev, FW_BUG "overlapping command and response buffer sizes are not identical");
		ret = -EINVAL;
		goto out;
	}

	priv->rsp = priv->cmd;

out:
	if (!ret)
		priv->cmd_size = cmd_size;

	crb_go_idle(dev, priv);

	return ret;
}

static int crb_acpi_add(struct acpi_device *device)
{
	struct acpi_table_tpm2 *buf;
	struct crb_priv *priv;
	struct tpm_chip *chip;
	struct device *dev = &device->dev;
	struct tpm2_crb_smc *crb_smc;
	acpi_status status;
	u32 sm;
	int rc;

	status = acpi_get_table(ACPI_SIG_TPM2, 1,
				(struct acpi_table_header **) &buf);
	if (ACPI_FAILURE(status) || buf->header.length < sizeof(*buf)) {
		dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
		return -EINVAL;
	}

	/* Should the FIFO driver handle this? */
	sm = buf->start_method;
	if (sm == ACPI_TPM2_MEMORY_MAPPED)
		return -ENODEV;

	priv = devm_kzalloc(dev, sizeof(struct crb_priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	/* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs
	 * report only ACPI start but in practice seems to require both
	 * ACPI start and CRB start.
	 */
	if (sm == ACPI_TPM2_COMMAND_BUFFER || sm == ACPI_TPM2_MEMORY_MAPPED ||
	    !strcmp(acpi_device_hid(device), "MSFT0101"))
		priv->flags |= CRB_FL_CRB_START;

	if (sm == ACPI_TPM2_START_METHOD ||
	    sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)
		priv->flags |= CRB_FL_ACPI_START;

	if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC) {
		if (buf->header.length < (sizeof(*buf) + sizeof(*crb_smc))) {
			dev_err(dev,
				FW_BUG "TPM2 ACPI table has wrong size %u for start method type %d\n",
				buf->header.length,
				ACPI_TPM2_COMMAND_BUFFER_WITH_ARM_SMC);
			return -EINVAL;
		}
		crb_smc = ACPI_ADD_PTR(struct tpm2_crb_smc, buf, sizeof(*buf));
		priv->smc_func_id = crb_smc->smc_func_id;
		priv->flags |= CRB_FL_CRB_SMC_START;
	}

	rc = crb_map_io(device, priv, buf);
	if (rc)
		return rc;

	chip = tpmm_chip_alloc(dev, &tpm_crb);
	if (IS_ERR(chip))
		return PTR_ERR(chip);

	dev_set_drvdata(&chip->dev, priv);
	chip->acpi_dev_handle = device->handle;
	chip->flags = TPM_CHIP_FLAG_TPM2;

	rc  = crb_cmd_ready(dev, priv);
	if (rc)
		return rc;

	pm_runtime_get_noresume(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	rc = tpm_chip_register(chip);
	if (rc) {
		crb_go_idle(dev, priv);
		pm_runtime_put_noidle(dev);
		pm_runtime_disable(dev);
		return rc;
	}

	pm_runtime_put(dev);

	return 0;
}

static int crb_acpi_remove(struct acpi_device *device)
{
	struct device *dev = &device->dev;
	struct tpm_chip *chip = dev_get_drvdata(dev);

	tpm_chip_unregister(chip);

	pm_runtime_disable(dev);

	return 0;
}

static int __maybe_unused crb_pm_runtime_suspend(struct device *dev)
{
	struct tpm_chip *chip = dev_get_drvdata(dev);
	struct crb_priv *priv = dev_get_drvdata(&chip->dev);

	return crb_go_idle(dev, priv);
}

static int __maybe_unused crb_pm_runtime_resume(struct device *dev)
{
	struct tpm_chip *chip = dev_get_drvdata(dev);
	struct crb_priv *priv = dev_get_drvdata(&chip->dev);

	return crb_cmd_ready(dev, priv);
}

static int __maybe_unused crb_pm_suspend(struct device *dev)
{
	int ret;

	ret = tpm_pm_suspend(dev);
	if (ret)
		return ret;

	return crb_pm_runtime_suspend(dev);
}

static int __maybe_unused crb_pm_resume(struct device *dev)
{
	int ret;

	ret = crb_pm_runtime_resume(dev);
	if (ret)
		return ret;

	return tpm_pm_resume(dev);
}

static const struct dev_pm_ops crb_pm = {
	SET_SYSTEM_SLEEP_PM_OPS(crb_pm_suspend, crb_pm_resume)
	SET_RUNTIME_PM_OPS(crb_pm_runtime_suspend, crb_pm_runtime_resume, NULL)
};

static struct acpi_device_id crb_device_ids[] = {
	{"MSFT0101", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, crb_device_ids);

static struct acpi_driver crb_acpi_driver = {
	.name = "tpm_crb",
	.ids = crb_device_ids,
	.ops = {
		.add = crb_acpi_add,
		.remove = crb_acpi_remove,
	},
	.drv = {
		.pm = &crb_pm,
	},
};

module_acpi_driver(crb_acpi_driver);
MODULE_AUTHOR("Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>");
MODULE_DESCRIPTION("TPM2 Driver");
MODULE_VERSION("0.1");
MODULE_LICENSE("GPL");