1/*
2 * Copyright (C) 2012,2013 Infineon Technologies
3 *
4 * Authors:
5 * Peter Huewe <peter.huewe@infineon.com>
6 *
7 * Device driver for TCG/TCPA TPM (trusted platform module).
8 * Specifications at www.trustedcomputinggroup.org
9 *
10 * This device driver implements the TPM interface as defined in
11 * the TCG TPM Interface Spec version 1.2, revision 1.0 and the
12 * Infineon I2C Protocol Stack Specification v0.20.
13 *
14 * It is based on the original tpm_tis device driver from Leendert van
15 * Dorn and Kyleen Hall.
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License as
19 * published by the Free Software Foundation, version 2 of the
20 * License.
21 *
22 *
23 */
24#include <linux/i2c.h>
25#include <linux/module.h>
26#include <linux/wait.h>
27#include "tpm.h"
28
29/* max. buffer size supported by our TPM */
30#define TPM_BUFSIZE 1260
31
32/* max. number of iterations after I2C NAK */
33#define MAX_COUNT 3
34
35#define SLEEP_DURATION_LOW 55
36#define SLEEP_DURATION_HI 65
37
38/* max. number of iterations after I2C NAK for 'long' commands
39 * we need this especially for sending TPM_READY, since the cleanup after the
40 * transtion to the ready state may take some time, but it is unpredictable
41 * how long it will take.
42 */
43#define MAX_COUNT_LONG 50
44
45#define SLEEP_DURATION_LONG_LOW 200
46#define SLEEP_DURATION_LONG_HI 220
47
48/* After sending TPM_READY to 'reset' the TPM we have to sleep even longer */
49#define SLEEP_DURATION_RESET_LOW 2400
50#define SLEEP_DURATION_RESET_HI 2600
51
52/* we want to use usleep_range instead of msleep for the 5ms TPM_TIMEOUT */
53#define TPM_TIMEOUT_US_LOW (TPM_TIMEOUT * 1000)
54#define TPM_TIMEOUT_US_HI  (TPM_TIMEOUT_US_LOW + 2000)
55
56/* expected value for DIDVID register */
57#define TPM_TIS_I2C_DID_VID_9635 0xd1150b00L
58#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
59
60enum i2c_chip_type {
61	SLB9635,
62	SLB9645,
63	UNKNOWN,
64};
65
66/* Structure to store I2C TPM specific stuff */
67struct tpm_inf_dev {
68	struct i2c_client *client;
69	u8 buf[TPM_BUFSIZE + sizeof(u8)]; /* max. buffer size + addr */
70	struct tpm_chip *chip;
71	enum i2c_chip_type chip_type;
72};
73
74static struct tpm_inf_dev tpm_dev;
75
76/*
77 * iic_tpm_read() - read from TPM register
78 * @addr: register address to read from
79 * @buffer: provided by caller
80 * @len: number of bytes to read
81 *
82 * Read len bytes from TPM register and put them into
83 * buffer (little-endian format, i.e. first byte is put into buffer[0]).
84 *
85 * NOTE: TPM is big-endian for multi-byte values. Multi-byte
86 * values have to be swapped.
87 *
88 * NOTE: We can't unfortunately use the combined read/write functions
89 * provided by the i2c core as the TPM currently does not support the
90 * repeated start condition and due to it's special requirements.
91 * The i2c_smbus* functions do not work for this chip.
92 *
93 * Return -EIO on error, 0 on success.
94 */
95static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
96{
97
98	struct i2c_msg msg1 = {
99		.addr = tpm_dev.client->addr,
100		.len = 1,
101		.buf = &addr
102	};
103	struct i2c_msg msg2 = {
104		.addr = tpm_dev.client->addr,
105		.flags = I2C_M_RD,
106		.len = len,
107		.buf = buffer
108	};
109	struct i2c_msg msgs[] = {msg1, msg2};
110
111	int rc = 0;
112	int count;
113
114	/* Lock the adapter for the duration of the whole sequence. */
115	if (!tpm_dev.client->adapter->algo->master_xfer)
116		return -EOPNOTSUPP;
117	i2c_lock_adapter(tpm_dev.client->adapter);
118
119	if (tpm_dev.chip_type == SLB9645) {
120		/* use a combined read for newer chips
121		 * unfortunately the smbus functions are not suitable due to
122		 * the 32 byte limit of the smbus.
123		 * retries should usually not be needed, but are kept just to
124		 * be on the safe side.
125		 */
126		for (count = 0; count < MAX_COUNT; count++) {
127			rc = __i2c_transfer(tpm_dev.client->adapter, msgs, 2);
128			if (rc > 0)
129				break;	/* break here to skip sleep */
130			usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
131		}
132	} else {
133		/* slb9635 protocol should work in all cases */
134		for (count = 0; count < MAX_COUNT; count++) {
135			rc = __i2c_transfer(tpm_dev.client->adapter, &msg1, 1);
136			if (rc > 0)
137				break;	/* break here to skip sleep */
138
139			usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
140		}
141
142		if (rc <= 0)
143			goto out;
144
145		/* After the TPM has successfully received the register address
146		 * it needs some time, thus we're sleeping here again, before
147		 * retrieving the data
148		 */
149		for (count = 0; count < MAX_COUNT; count++) {
150			usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
151			rc = __i2c_transfer(tpm_dev.client->adapter, &msg2, 1);
152			if (rc > 0)
153				break;
154		}
155	}
156
157out:
158	i2c_unlock_adapter(tpm_dev.client->adapter);
159	/* take care of 'guard time' */
160	usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
161
162	/* __i2c_transfer returns the number of successfully transferred
163	 * messages.
164	 * So rc should be greater than 0 here otherwise we have an error.
165	 */
166	if (rc <= 0)
167		return -EIO;
168
169	return 0;
170}
171
172static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
173				 unsigned int sleep_low,
174				 unsigned int sleep_hi, u8 max_count)
175{
176	int rc = -EIO;
177	int count;
178
179	struct i2c_msg msg1 = {
180		.addr = tpm_dev.client->addr,
181		.len = len + 1,
182		.buf = tpm_dev.buf
183	};
184
185	if (len > TPM_BUFSIZE)
186		return -EINVAL;
187
188	if (!tpm_dev.client->adapter->algo->master_xfer)
189		return -EOPNOTSUPP;
190	i2c_lock_adapter(tpm_dev.client->adapter);
191
192	/* prepend the 'register address' to the buffer */
193	tpm_dev.buf[0] = addr;
194	memcpy(&(tpm_dev.buf[1]), buffer, len);
195
196	/*
197	 * NOTE: We have to use these special mechanisms here and unfortunately
198	 * cannot rely on the standard behavior of i2c_transfer.
199	 * Even for newer chips the smbus functions are not
200	 * suitable due to the 32 byte limit of the smbus.
201	 */
202	for (count = 0; count < max_count; count++) {
203		rc = __i2c_transfer(tpm_dev.client->adapter, &msg1, 1);
204		if (rc > 0)
205			break;
206		usleep_range(sleep_low, sleep_hi);
207	}
208
209	i2c_unlock_adapter(tpm_dev.client->adapter);
210	/* take care of 'guard time' */
211	usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
212
213	/* __i2c_transfer returns the number of successfully transferred
214	 * messages.
215	 * So rc should be greater than 0 here otherwise we have an error.
216	 */
217	if (rc <= 0)
218		return -EIO;
219
220	return 0;
221}
222
223/*
224 * iic_tpm_write() - write to TPM register
225 * @addr: register address to write to
226 * @buffer: containing data to be written
227 * @len: number of bytes to write
228 *
229 * Write len bytes from provided buffer to TPM register (little
230 * endian format, i.e. buffer[0] is written as first byte).
231 *
232 * NOTE: TPM is big-endian for multi-byte values. Multi-byte
233 * values have to be swapped.
234 *
235 * NOTE: use this function instead of the iic_tpm_write_generic function.
236 *
237 * Return -EIO on error, 0 on success
238 */
239static int iic_tpm_write(u8 addr, u8 *buffer, size_t len)
240{
241	return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LOW,
242				     SLEEP_DURATION_HI, MAX_COUNT);
243}
244
245/*
246 * This function is needed especially for the cleanup situation after
247 * sending TPM_READY
248 * */
249static int iic_tpm_write_long(u8 addr, u8 *buffer, size_t len)
250{
251	return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LONG_LOW,
252				     SLEEP_DURATION_LONG_HI, MAX_COUNT_LONG);
253}
254
255enum tis_access {
256	TPM_ACCESS_VALID = 0x80,
257	TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
258	TPM_ACCESS_REQUEST_PENDING = 0x04,
259	TPM_ACCESS_REQUEST_USE = 0x02,
260};
261
262enum tis_status {
263	TPM_STS_VALID = 0x80,
264	TPM_STS_COMMAND_READY = 0x40,
265	TPM_STS_GO = 0x20,
266	TPM_STS_DATA_AVAIL = 0x10,
267	TPM_STS_DATA_EXPECT = 0x08,
268};
269
270enum tis_defaults {
271	TIS_SHORT_TIMEOUT = 750,	/* ms */
272	TIS_LONG_TIMEOUT = 2000,	/* 2 sec */
273};
274
275#define	TPM_ACCESS(l)			(0x0000 | ((l) << 4))
276#define	TPM_STS(l)			(0x0001 | ((l) << 4))
277#define	TPM_DATA_FIFO(l)		(0x0005 | ((l) << 4))
278#define	TPM_DID_VID(l)			(0x0006 | ((l) << 4))
279
280static int check_locality(struct tpm_chip *chip, int loc)
281{
282	u8 buf;
283	int rc;
284
285	rc = iic_tpm_read(TPM_ACCESS(loc), &buf, 1);
286	if (rc < 0)
287		return rc;
288
289	if ((buf & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
290	    (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
291		chip->vendor.locality = loc;
292		return loc;
293	}
294
295	return -EIO;
296}
297
298/* implementation similar to tpm_tis */
299static void release_locality(struct tpm_chip *chip, int loc, int force)
300{
301	u8 buf;
302	if (iic_tpm_read(TPM_ACCESS(loc), &buf, 1) < 0)
303		return;
304
305	if (force || (buf & (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
306	    (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) {
307		buf = TPM_ACCESS_ACTIVE_LOCALITY;
308		iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
309	}
310}
311
312static int request_locality(struct tpm_chip *chip, int loc)
313{
314	unsigned long stop;
315	u8 buf = TPM_ACCESS_REQUEST_USE;
316
317	if (check_locality(chip, loc) >= 0)
318		return loc;
319
320	iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
321
322	/* wait for burstcount */
323	stop = jiffies + chip->vendor.timeout_a;
324	do {
325		if (check_locality(chip, loc) >= 0)
326			return loc;
327		usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
328	} while (time_before(jiffies, stop));
329
330	return -ETIME;
331}
332
333static u8 tpm_tis_i2c_status(struct tpm_chip *chip)
334{
335	/* NOTE: since I2C read may fail, return 0 in this case --> time-out */
336	u8 buf = 0xFF;
337	u8 i = 0;
338
339	do {
340		if (iic_tpm_read(TPM_STS(chip->vendor.locality), &buf, 1) < 0)
341			return 0;
342
343		i++;
344	/* if locallity is set STS should not be 0xFF */
345	} while ((buf == 0xFF) && i < 10);
346
347	return buf;
348}
349
350static void tpm_tis_i2c_ready(struct tpm_chip *chip)
351{
352	/* this causes the current command to be aborted */
353	u8 buf = TPM_STS_COMMAND_READY;
354	iic_tpm_write_long(TPM_STS(chip->vendor.locality), &buf, 1);
355}
356
357static ssize_t get_burstcount(struct tpm_chip *chip)
358{
359	unsigned long stop;
360	ssize_t burstcnt;
361	u8 buf[3];
362
363	/* wait for burstcount */
364	/* which timeout value, spec has 2 answers (c & d) */
365	stop = jiffies + chip->vendor.timeout_d;
366	do {
367		/* Note: STS is little endian */
368		if (iic_tpm_read(TPM_STS(chip->vendor.locality)+1, buf, 3) < 0)
369			burstcnt = 0;
370		else
371			burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
372
373		if (burstcnt)
374			return burstcnt;
375
376		usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
377	} while (time_before(jiffies, stop));
378	return -EBUSY;
379}
380
381static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
382			 int *status)
383{
384	unsigned long stop;
385
386	/* check current status */
387	*status = tpm_tis_i2c_status(chip);
388	if ((*status != 0xFF) && (*status & mask) == mask)
389		return 0;
390
391	stop = jiffies + timeout;
392	do {
393		/* since we just checked the status, give the TPM some time */
394		usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
395		*status = tpm_tis_i2c_status(chip);
396		if ((*status & mask) == mask)
397			return 0;
398
399	} while (time_before(jiffies, stop));
400
401	return -ETIME;
402}
403
404static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
405{
406	size_t size = 0;
407	ssize_t burstcnt;
408	u8 retries = 0;
409	int rc;
410
411	while (size < count) {
412		burstcnt = get_burstcount(chip);
413
414		/* burstcnt < 0 = TPM is busy */
415		if (burstcnt < 0)
416			return burstcnt;
417
418		/* limit received data to max. left */
419		if (burstcnt > (count - size))
420			burstcnt = count - size;
421
422		rc = iic_tpm_read(TPM_DATA_FIFO(chip->vendor.locality),
423				  &(buf[size]), burstcnt);
424		if (rc == 0)
425			size += burstcnt;
426		else if (rc < 0)
427			retries++;
428
429		/* avoid endless loop in case of broken HW */
430		if (retries > MAX_COUNT_LONG)
431			return -EIO;
432	}
433	return size;
434}
435
436static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
437{
438	int size = 0;
439	int expected, status;
440
441	if (count < TPM_HEADER_SIZE) {
442		size = -EIO;
443		goto out;
444	}
445
446	/* read first 10 bytes, including tag, paramsize, and result */
447	size = recv_data(chip, buf, TPM_HEADER_SIZE);
448	if (size < TPM_HEADER_SIZE) {
449		dev_err(chip->pdev, "Unable to read header\n");
450		goto out;
451	}
452
453	expected = be32_to_cpu(*(__be32 *)(buf + 2));
454	if ((size_t) expected > count) {
455		size = -EIO;
456		goto out;
457	}
458
459	size += recv_data(chip, &buf[TPM_HEADER_SIZE],
460			  expected - TPM_HEADER_SIZE);
461	if (size < expected) {
462		dev_err(chip->pdev, "Unable to read remainder of result\n");
463		size = -ETIME;
464		goto out;
465	}
466
467	wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status);
468	if (status & TPM_STS_DATA_AVAIL) {	/* retry? */
469		dev_err(chip->pdev, "Error left over data\n");
470		size = -EIO;
471		goto out;
472	}
473
474out:
475	tpm_tis_i2c_ready(chip);
476	/* The TPM needs some time to clean up here,
477	 * so we sleep rather than keeping the bus busy
478	 */
479	usleep_range(SLEEP_DURATION_RESET_LOW, SLEEP_DURATION_RESET_HI);
480	release_locality(chip, chip->vendor.locality, 0);
481	return size;
482}
483
484static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
485{
486	int rc, status;
487	ssize_t burstcnt;
488	size_t count = 0;
489	u8 retries = 0;
490	u8 sts = TPM_STS_GO;
491
492	if (len > TPM_BUFSIZE)
493		return -E2BIG;	/* command is too long for our tpm, sorry */
494
495	if (request_locality(chip, 0) < 0)
496		return -EBUSY;
497
498	status = tpm_tis_i2c_status(chip);
499	if ((status & TPM_STS_COMMAND_READY) == 0) {
500		tpm_tis_i2c_ready(chip);
501		if (wait_for_stat
502		    (chip, TPM_STS_COMMAND_READY,
503		     chip->vendor.timeout_b, &status) < 0) {
504			rc = -ETIME;
505			goto out_err;
506		}
507	}
508
509	while (count < len - 1) {
510		burstcnt = get_burstcount(chip);
511
512		/* burstcnt < 0 = TPM is busy */
513		if (burstcnt < 0)
514			return burstcnt;
515
516		if (burstcnt > (len - 1 - count))
517			burstcnt = len - 1 - count;
518
519		rc = iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality),
520				   &(buf[count]), burstcnt);
521		if (rc == 0)
522			count += burstcnt;
523		else if (rc < 0)
524			retries++;
525
526		/* avoid endless loop in case of broken HW */
527		if (retries > MAX_COUNT_LONG) {
528			rc = -EIO;
529			goto out_err;
530		}
531
532		wait_for_stat(chip, TPM_STS_VALID,
533			      chip->vendor.timeout_c, &status);
534
535		if ((status & TPM_STS_DATA_EXPECT) == 0) {
536			rc = -EIO;
537			goto out_err;
538		}
539	}
540
541	/* write last byte */
542	iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality), &(buf[count]), 1);
543	wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status);
544	if ((status & TPM_STS_DATA_EXPECT) != 0) {
545		rc = -EIO;
546		goto out_err;
547	}
548
549	/* go and do it */
550	iic_tpm_write(TPM_STS(chip->vendor.locality), &sts, 1);
551
552	return len;
553out_err:
554	tpm_tis_i2c_ready(chip);
555	/* The TPM needs some time to clean up here,
556	 * so we sleep rather than keeping the bus busy
557	 */
558	usleep_range(SLEEP_DURATION_RESET_LOW, SLEEP_DURATION_RESET_HI);
559	release_locality(chip, chip->vendor.locality, 0);
560	return rc;
561}
562
563static bool tpm_tis_i2c_req_canceled(struct tpm_chip *chip, u8 status)
564{
565	return (status == TPM_STS_COMMAND_READY);
566}
567
568static const struct tpm_class_ops tpm_tis_i2c = {
569	.status = tpm_tis_i2c_status,
570	.recv = tpm_tis_i2c_recv,
571	.send = tpm_tis_i2c_send,
572	.cancel = tpm_tis_i2c_ready,
573	.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
574	.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
575	.req_canceled = tpm_tis_i2c_req_canceled,
576};
577
578static int tpm_tis_i2c_init(struct device *dev)
579{
580	u32 vendor;
581	int rc = 0;
582	struct tpm_chip *chip;
583
584	chip = tpmm_chip_alloc(dev, &tpm_tis_i2c);
585	if (IS_ERR(chip))
586		return PTR_ERR(chip);
587
588	/* Disable interrupts */
589	chip->vendor.irq = 0;
590
591	/* Default timeouts */
592	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
593	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
594	chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
595	chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
596
597	if (request_locality(chip, 0) != 0) {
598		dev_err(dev, "could not request locality\n");
599		rc = -ENODEV;
600		goto out_err;
601	}
602
603	/* read four bytes from DID_VID register */
604	if (iic_tpm_read(TPM_DID_VID(0), (u8 *)&vendor, 4) < 0) {
605		dev_err(dev, "could not read vendor id\n");
606		rc = -EIO;
607		goto out_release;
608	}
609
610	if (vendor == TPM_TIS_I2C_DID_VID_9645) {
611		tpm_dev.chip_type = SLB9645;
612	} else if (vendor == TPM_TIS_I2C_DID_VID_9635) {
613		tpm_dev.chip_type = SLB9635;
614	} else {
615		dev_err(dev, "vendor id did not match! ID was %08x\n", vendor);
616		rc = -ENODEV;
617		goto out_release;
618	}
619
620	dev_info(dev, "1.2 TPM (device-id 0x%X)\n", vendor >> 16);
621
622	INIT_LIST_HEAD(&chip->vendor.list);
623	tpm_dev.chip = chip;
624
625	tpm_get_timeouts(chip);
626	tpm_do_selftest(chip);
627
628	return tpm_chip_register(chip);
629out_release:
630	release_locality(chip, chip->vendor.locality, 1);
631	tpm_dev.client = NULL;
632out_err:
633	return rc;
634}
635
636static const struct i2c_device_id tpm_tis_i2c_table[] = {
637	{"tpm_i2c_infineon", 0},
638	{"slb9635tt", 0},
639	{"slb9645tt", 1},
640	{},
641};
642
643MODULE_DEVICE_TABLE(i2c, tpm_tis_i2c_table);
644
645#ifdef CONFIG_OF
646static const struct of_device_id tpm_tis_i2c_of_match[] = {
647	{
648		.name = "tpm_i2c_infineon",
649		.type = "tpm",
650		.compatible = "infineon,tpm_i2c_infineon",
651		.data = (void *)0
652	},
653	{
654		.name = "slb9635tt",
655		.type = "tpm",
656		.compatible = "infineon,slb9635tt",
657		.data = (void *)0
658	},
659	{
660		.name = "slb9645tt",
661		.type = "tpm",
662		.compatible = "infineon,slb9645tt",
663		.data = (void *)1
664	},
665	{},
666};
667MODULE_DEVICE_TABLE(of, tpm_tis_i2c_of_match);
668#endif
669
670static SIMPLE_DEV_PM_OPS(tpm_tis_i2c_ops, tpm_pm_suspend, tpm_pm_resume);
671
672static int tpm_tis_i2c_probe(struct i2c_client *client,
673			     const struct i2c_device_id *id)
674{
675	int rc;
676	struct device *dev = &(client->dev);
677
678	if (tpm_dev.client != NULL) {
679		dev_err(dev, "This driver only supports one client at a time\n");
680		return -EBUSY;	/* We only support one client */
681	}
682
683	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
684		dev_err(dev, "no algorithms associated to the i2c bus\n");
685		return -ENODEV;
686	}
687
688	tpm_dev.client = client;
689	rc = tpm_tis_i2c_init(&client->dev);
690	if (rc != 0) {
691		tpm_dev.client = NULL;
692		rc = -ENODEV;
693	}
694	return rc;
695}
696
697static int tpm_tis_i2c_remove(struct i2c_client *client)
698{
699	struct tpm_chip *chip = tpm_dev.chip;
700
701	tpm_chip_unregister(chip);
702	release_locality(chip, chip->vendor.locality, 1);
703	tpm_dev.client = NULL;
704
705	return 0;
706}
707
708static struct i2c_driver tpm_tis_i2c_driver = {
709	.id_table = tpm_tis_i2c_table,
710	.probe = tpm_tis_i2c_probe,
711	.remove = tpm_tis_i2c_remove,
712	.driver = {
713		   .name = "tpm_i2c_infineon",
714		   .owner = THIS_MODULE,
715		   .pm = &tpm_tis_i2c_ops,
716		   .of_match_table = of_match_ptr(tpm_tis_i2c_of_match),
717		   },
718};
719
720module_i2c_driver(tpm_tis_i2c_driver);
721MODULE_AUTHOR("Peter Huewe <peter.huewe@infineon.com>");
722MODULE_DESCRIPTION("TPM TIS I2C Infineon Driver");
723MODULE_VERSION("2.2.0");
724MODULE_LICENSE("GPL");
725