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32
33#include <linux/pci.h>
34#include <linux/module.h>
35#include <linux/platform_device.h>
36#include <linux/i2c.h>
37#include <linux/fs.h>
38#include <linux/miscdevice.h>
39#include <linux/kernel.h>
40#include <linux/delay.h>
41#include <linux/init.h>
42#include <linux/wait.h>
43#include <linux/string.h>
44#include <linux/interrupt.h>
45#include <linux/spinlock.h>
46#include <linux/sysfs.h>
47#include <linux/gpio.h>
48#include <linux/sched.h>
49#include <linux/uaccess.h>
50#include <linux/io.h>
51#include <linux/slab.h>
52
53#include "tpm.h"
54#include "tpm_i2c_stm_st33.h"
55
56enum stm33zp24_access {
57 TPM_ACCESS_VALID = 0x80,
58 TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
59 TPM_ACCESS_REQUEST_PENDING = 0x04,
60 TPM_ACCESS_REQUEST_USE = 0x02,
61};
62
63enum stm33zp24_status {
64 TPM_STS_VALID = 0x80,
65 TPM_STS_COMMAND_READY = 0x40,
66 TPM_STS_GO = 0x20,
67 TPM_STS_DATA_AVAIL = 0x10,
68 TPM_STS_DATA_EXPECT = 0x08,
69};
70
71enum stm33zp24_int_flags {
72 TPM_GLOBAL_INT_ENABLE = 0x80,
73 TPM_INTF_CMD_READY_INT = 0x080,
74 TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
75 TPM_INTF_WAKE_UP_READY_INT = 0x020,
76 TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
77 TPM_INTF_STS_VALID_INT = 0x002,
78 TPM_INTF_DATA_AVAIL_INT = 0x001,
79};
80
81enum tis_defaults {
82 TIS_SHORT_TIMEOUT = 750,
83 TIS_LONG_TIMEOUT = 2000,
84};
85
86
87
88
89
90
91
92
93
94static int write8_reg(struct i2c_client *client, u8 tpm_register,
95 u8 *tpm_data, u16 tpm_size)
96{
97 struct st33zp24_platform_data *pin_infos;
98
99 pin_infos = client->dev.platform_data;
100
101 pin_infos->tpm_i2c_buffer[0][0] = tpm_register;
102 memcpy(&pin_infos->tpm_i2c_buffer[0][1], tpm_data, tpm_size);
103 return i2c_master_send(client, pin_infos->tpm_i2c_buffer[0],
104 tpm_size + 1);
105}
106
107
108
109
110
111
112
113
114
115static int read8_reg(struct i2c_client *client, u8 tpm_register,
116 u8 *tpm_data, int tpm_size)
117{
118 u8 status = 0;
119 u8 data;
120
121 data = TPM_DUMMY_BYTE;
122 status = write8_reg(client, tpm_register, &data, 1);
123 if (status == 2)
124 status = i2c_master_recv(client, tpm_data, tpm_size);
125 return status;
126}
127
128
129
130
131
132
133
134
135
136
137#define I2C_WRITE_DATA(client, tpm_register, tpm_data, tpm_size) \
138 (write8_reg(client, tpm_register | \
139 TPM_WRITE_DIRECTION, tpm_data, tpm_size))
140
141
142
143
144
145
146
147
148
149
150#define I2C_READ_DATA(client, tpm_register, tpm_data, tpm_size) \
151 (read8_reg(client, tpm_register, tpm_data, tpm_size))
152
153
154
155
156
157
158static void clear_interruption(struct i2c_client *client)
159{
160 u8 interrupt;
161 I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
162 I2C_WRITE_DATA(client, TPM_INT_STATUS, &interrupt, 1);
163 I2C_READ_DATA(client, TPM_INT_STATUS, &interrupt, 1);
164}
165
166
167
168
169
170
171
172static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
173 unsigned long timeout)
174{
175 long status;
176 struct i2c_client *client;
177 struct st33zp24_platform_data *pin_infos;
178
179 client = (struct i2c_client *)TPM_VPRIV(chip);
180 pin_infos = client->dev.platform_data;
181
182 status = wait_for_completion_interruptible_timeout(
183 &pin_infos->irq_detection,
184 timeout);
185 if (status > 0)
186 enable_irq(gpio_to_irq(pin_infos->io_serirq));
187 gpio_direction_input(pin_infos->io_serirq);
188
189 return status;
190}
191
192static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
193 unsigned long timeout)
194{
195 int status = 2;
196 struct i2c_client *client;
197
198 client = (struct i2c_client *)TPM_VPRIV(chip);
199
200 status = _wait_for_interrupt_serirq_timeout(chip, timeout);
201 if (!status) {
202 status = -EBUSY;
203 } else {
204 clear_interruption(client);
205 if (condition)
206 status = 1;
207 }
208 return status;
209}
210
211
212
213
214
215static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
216{
217 struct i2c_client *client;
218 u8 data;
219
220 client = (struct i2c_client *)TPM_VPRIV(chip);
221
222 data = TPM_STS_COMMAND_READY;
223 I2C_WRITE_DATA(client, TPM_STS, &data, 1);
224 if (chip->vendor.irq)
225 wait_for_serirq_timeout(chip, 1, chip->vendor.timeout_a);
226}
227
228
229
230
231
232
233static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
234{
235 struct i2c_client *client;
236 u8 data;
237 client = (struct i2c_client *)TPM_VPRIV(chip);
238
239 I2C_READ_DATA(client, TPM_STS, &data, 1);
240 return data;
241}
242
243
244
245
246
247
248
249static int check_locality(struct tpm_chip *chip)
250{
251 struct i2c_client *client;
252 u8 data;
253 u8 status;
254
255 client = (struct i2c_client *)TPM_VPRIV(chip);
256
257 status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1);
258 if (status && (data &
259 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
260 (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
261 return chip->vendor.locality;
262
263 return -EACCES;
264
265}
266
267
268
269
270
271
272static int request_locality(struct tpm_chip *chip)
273{
274 unsigned long stop;
275 long rc;
276 struct i2c_client *client;
277 u8 data;
278
279 client = (struct i2c_client *)TPM_VPRIV(chip);
280
281 if (check_locality(chip) == chip->vendor.locality)
282 return chip->vendor.locality;
283
284 data = TPM_ACCESS_REQUEST_USE;
285 rc = I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
286 if (rc < 0)
287 goto end;
288
289 if (chip->vendor.irq) {
290 rc = wait_for_serirq_timeout(chip, (check_locality
291 (chip) >= 0),
292 chip->vendor.timeout_a);
293 if (rc > 0)
294 return chip->vendor.locality;
295 } else {
296 stop = jiffies + chip->vendor.timeout_a;
297 do {
298 if (check_locality(chip) >= 0)
299 return chip->vendor.locality;
300 msleep(TPM_TIMEOUT);
301 } while (time_before(jiffies, stop));
302 }
303 rc = -EACCES;
304end:
305 return rc;
306}
307
308
309
310
311
312static void release_locality(struct tpm_chip *chip)
313{
314 struct i2c_client *client;
315 u8 data;
316
317 client = (struct i2c_client *)TPM_VPRIV(chip);
318 data = TPM_ACCESS_ACTIVE_LOCALITY;
319
320 I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
321}
322
323
324
325
326
327
328static int get_burstcount(struct tpm_chip *chip)
329{
330 unsigned long stop;
331 int burstcnt, status;
332 u8 tpm_reg, temp;
333
334 struct i2c_client *client = (struct i2c_client *)TPM_VPRIV(chip);
335
336 stop = jiffies + chip->vendor.timeout_d;
337 do {
338 tpm_reg = TPM_STS + 1;
339 status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
340 if (status < 0)
341 goto end;
342
343 tpm_reg = tpm_reg + 1;
344 burstcnt = temp;
345 status = I2C_READ_DATA(client, tpm_reg, &temp, 1);
346 if (status < 0)
347 goto end;
348
349 burstcnt |= temp << 8;
350 if (burstcnt)
351 return burstcnt;
352 msleep(TPM_TIMEOUT);
353 } while (time_before(jiffies, stop));
354
355end:
356 return -EBUSY;
357}
358
359
360
361
362
363
364
365
366
367static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
368 wait_queue_head_t *queue)
369{
370 unsigned long stop;
371 long rc;
372 u8 status;
373
374 if (chip->vendor.irq) {
375 rc = wait_for_serirq_timeout(chip, ((tpm_stm_i2c_status
376 (chip) & mask) ==
377 mask), timeout);
378 if (rc > 0)
379 return 0;
380 } else {
381 stop = jiffies + timeout;
382 do {
383 msleep(TPM_TIMEOUT);
384 status = tpm_stm_i2c_status(chip);
385 if ((status & mask) == mask)
386 return 0;
387 } while (time_before(jiffies, stop));
388 }
389 return -ETIME;
390}
391
392
393
394
395
396
397
398
399static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
400{
401 int size = 0, burstcnt, len;
402 struct i2c_client *client;
403
404 client = (struct i2c_client *)TPM_VPRIV(chip);
405
406 while (size < count &&
407 wait_for_stat(chip,
408 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
409 chip->vendor.timeout_c,
410 &chip->vendor.read_queue)
411 == 0) {
412 burstcnt = get_burstcount(chip);
413 len = min_t(int, burstcnt, count - size);
414 I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
415 size += len;
416 }
417 return size;
418}
419
420
421
422
423
424
425
426static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
427{
428 struct tpm_chip *chip = dev_id;
429 struct i2c_client *client;
430 struct st33zp24_platform_data *pin_infos;
431
432 disable_irq_nosync(irq);
433
434 client = (struct i2c_client *)TPM_VPRIV(chip);
435 pin_infos = client->dev.platform_data;
436
437 complete(&pin_infos->irq_detection);
438 return IRQ_HANDLED;
439}
440
441
442
443
444
445
446
447
448
449
450
451static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
452 size_t len)
453{
454 u32 status, burstcnt = 0, i, size;
455 int ret;
456 u8 data;
457 struct i2c_client *client;
458
459 if (chip == NULL)
460 return -EBUSY;
461 if (len < TPM_HEADER_SIZE)
462 return -EBUSY;
463
464 client = (struct i2c_client *)TPM_VPRIV(chip);
465
466 client->flags = 0;
467
468 ret = request_locality(chip);
469 if (ret < 0)
470 return ret;
471
472 status = tpm_stm_i2c_status(chip);
473 if ((status & TPM_STS_COMMAND_READY) == 0) {
474 tpm_stm_i2c_cancel(chip);
475 if (wait_for_stat
476 (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
477 &chip->vendor.int_queue) < 0) {
478 ret = -ETIME;
479 goto out_err;
480 }
481 }
482
483 for (i = 0; i < len - 1;) {
484 burstcnt = get_burstcount(chip);
485 size = min_t(int, len - i - 1, burstcnt);
486 ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size);
487 if (ret < 0)
488 goto out_err;
489
490 i += size;
491 }
492
493 status = tpm_stm_i2c_status(chip);
494 if ((status & TPM_STS_DATA_EXPECT) == 0) {
495 ret = -EIO;
496 goto out_err;
497 }
498
499 ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf + len - 1, 1);
500 if (ret < 0)
501 goto out_err;
502
503 status = tpm_stm_i2c_status(chip);
504 if ((status & TPM_STS_DATA_EXPECT) != 0) {
505 ret = -EIO;
506 goto out_err;
507 }
508
509 data = TPM_STS_GO;
510 I2C_WRITE_DATA(client, TPM_STS, &data, 1);
511
512 return len;
513out_err:
514 tpm_stm_i2c_cancel(chip);
515 release_locality(chip);
516 return ret;
517}
518
519
520
521
522
523
524
525
526
527static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
528 size_t count)
529{
530 int size = 0;
531 int expected;
532
533 if (chip == NULL)
534 return -EBUSY;
535
536 if (count < TPM_HEADER_SIZE) {
537 size = -EIO;
538 goto out;
539 }
540
541 size = recv_data(chip, buf, TPM_HEADER_SIZE);
542 if (size < TPM_HEADER_SIZE) {
543 dev_err(chip->dev, "Unable to read header\n");
544 goto out;
545 }
546
547 expected = be32_to_cpu(*(__be32 *)(buf + 2));
548 if (expected > count) {
549 size = -EIO;
550 goto out;
551 }
552
553 size += recv_data(chip, &buf[TPM_HEADER_SIZE],
554 expected - TPM_HEADER_SIZE);
555 if (size < expected) {
556 dev_err(chip->dev, "Unable to read remainder of result\n");
557 size = -ETIME;
558 goto out;
559 }
560
561out:
562 chip->vendor.cancel(chip);
563 release_locality(chip);
564 return size;
565}
566
567static bool tpm_st33_i2c_req_canceled(struct tpm_chip *chip, u8 status)
568{
569 return (status == TPM_STS_COMMAND_READY);
570}
571
572static const struct file_operations tpm_st33_i2c_fops = {
573 .owner = THIS_MODULE,
574 .llseek = no_llseek,
575 .read = tpm_read,
576 .write = tpm_write,
577 .open = tpm_open,
578 .release = tpm_release,
579};
580
581static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
582static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
583static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
584static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
585static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
586static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL);
587static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
588static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
589
590static struct attribute *stm_tpm_attrs[] = {
591 &dev_attr_pubek.attr,
592 &dev_attr_pcrs.attr,
593 &dev_attr_enabled.attr,
594 &dev_attr_active.attr,
595 &dev_attr_owned.attr,
596 &dev_attr_temp_deactivated.attr,
597 &dev_attr_caps.attr,
598 &dev_attr_cancel.attr, NULL,
599};
600
601static struct attribute_group stm_tpm_attr_grp = {
602 .attrs = stm_tpm_attrs
603};
604
605static struct tpm_vendor_specific st_i2c_tpm = {
606 .send = tpm_stm_i2c_send,
607 .recv = tpm_stm_i2c_recv,
608 .cancel = tpm_stm_i2c_cancel,
609 .status = tpm_stm_i2c_status,
610 .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
611 .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
612 .req_canceled = tpm_st33_i2c_req_canceled,
613 .attr_group = &stm_tpm_attr_grp,
614 .miscdev = {.fops = &tpm_st33_i2c_fops,},
615};
616
617static int interrupts;
618module_param(interrupts, int, 0444);
619MODULE_PARM_DESC(interrupts, "Enable interrupts");
620
621static int power_mgt = 1;
622module_param(power_mgt, int, 0444);
623MODULE_PARM_DESC(power_mgt, "Power Management");
624
625
626
627
628
629
630
631
632static int
633tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
634{
635 int err;
636 u8 intmask;
637 struct tpm_chip *chip;
638 struct st33zp24_platform_data *platform_data;
639
640 if (client == NULL) {
641 pr_info("%s: i2c client is NULL. Device not accessible.\n",
642 __func__);
643 err = -ENODEV;
644 goto end;
645 }
646
647 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
648 dev_info(&client->dev, "client not i2c capable\n");
649 err = -ENODEV;
650 goto end;
651 }
652
653 chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
654 if (!chip) {
655 dev_info(&client->dev, "fail chip\n");
656 err = -ENODEV;
657 goto end;
658 }
659
660 platform_data = client->dev.platform_data;
661
662 if (!platform_data) {
663 dev_info(&client->dev, "chip not available\n");
664 err = -ENODEV;
665 goto _tpm_clean_answer;
666 }
667
668 platform_data->tpm_i2c_buffer[0] =
669 kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
670 if (platform_data->tpm_i2c_buffer[0] == NULL) {
671 err = -ENOMEM;
672 goto _tpm_clean_answer;
673 }
674 platform_data->tpm_i2c_buffer[1] =
675 kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
676 if (platform_data->tpm_i2c_buffer[1] == NULL) {
677 err = -ENOMEM;
678 goto _tpm_clean_response1;
679 }
680
681 TPM_VPRIV(chip) = client;
682
683 chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
684 chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
685 chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
686 chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
687
688 chip->vendor.locality = LOCALITY0;
689
690 if (power_mgt) {
691 err = gpio_request(platform_data->io_lpcpd, "TPM IO_LPCPD");
692 if (err)
693 goto _gpio_init1;
694 gpio_set_value(platform_data->io_lpcpd, 1);
695 }
696
697 if (interrupts) {
698 init_completion(&platform_data->irq_detection);
699 if (request_locality(chip) != LOCALITY0) {
700 err = -ENODEV;
701 goto _tpm_clean_response2;
702 }
703 err = gpio_request(platform_data->io_serirq, "TPM IO_SERIRQ");
704 if (err)
705 goto _gpio_init2;
706
707 clear_interruption(client);
708 err = request_irq(gpio_to_irq(platform_data->io_serirq),
709 &tpm_ioserirq_handler,
710 IRQF_TRIGGER_HIGH,
711 "TPM SERIRQ management", chip);
712 if (err < 0) {
713 dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
714 gpio_to_irq(platform_data->io_serirq));
715 goto _irq_set;
716 }
717
718 err = I2C_READ_DATA(client, TPM_INT_ENABLE, &intmask, 1);
719 if (err < 0)
720 goto _irq_set;
721
722 intmask |= TPM_INTF_CMD_READY_INT
723 | TPM_INTF_FIFO_AVALAIBLE_INT
724 | TPM_INTF_WAKE_UP_READY_INT
725 | TPM_INTF_LOCALITY_CHANGE_INT
726 | TPM_INTF_STS_VALID_INT
727 | TPM_INTF_DATA_AVAIL_INT;
728
729 err = I2C_WRITE_DATA(client, TPM_INT_ENABLE, &intmask, 1);
730 if (err < 0)
731 goto _irq_set;
732
733 intmask = TPM_GLOBAL_INT_ENABLE;
734 err = I2C_WRITE_DATA(client, (TPM_INT_ENABLE + 3), &intmask, 1);
735 if (err < 0)
736 goto _irq_set;
737
738 err = I2C_READ_DATA(client, TPM_INT_STATUS, &intmask, 1);
739 if (err < 0)
740 goto _irq_set;
741
742 chip->vendor.irq = interrupts;
743
744 tpm_gen_interrupt(chip);
745 }
746
747 tpm_get_timeouts(chip);
748
749 i2c_set_clientdata(client, chip);
750
751 dev_info(chip->dev, "TPM I2C Initialized\n");
752 return 0;
753_irq_set:
754 free_irq(gpio_to_irq(platform_data->io_serirq), (void *)chip);
755_gpio_init2:
756 if (interrupts)
757 gpio_free(platform_data->io_serirq);
758_gpio_init1:
759 if (power_mgt)
760 gpio_free(platform_data->io_lpcpd);
761_tpm_clean_response2:
762 kzfree(platform_data->tpm_i2c_buffer[1]);
763 platform_data->tpm_i2c_buffer[1] = NULL;
764_tpm_clean_response1:
765 kzfree(platform_data->tpm_i2c_buffer[0]);
766 platform_data->tpm_i2c_buffer[0] = NULL;
767_tpm_clean_answer:
768 tpm_remove_hardware(chip->dev);
769end:
770 pr_info("TPM I2C initialisation fail\n");
771 return err;
772}
773
774
775
776
777
778
779
780static int tpm_st33_i2c_remove(struct i2c_client *client)
781{
782 struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client);
783 struct st33zp24_platform_data *pin_infos =
784 ((struct i2c_client *)TPM_VPRIV(chip))->dev.platform_data;
785
786 if (pin_infos != NULL) {
787 free_irq(pin_infos->io_serirq, chip);
788
789 gpio_free(pin_infos->io_serirq);
790 gpio_free(pin_infos->io_lpcpd);
791
792 tpm_remove_hardware(chip->dev);
793
794 if (pin_infos->tpm_i2c_buffer[1] != NULL) {
795 kzfree(pin_infos->tpm_i2c_buffer[1]);
796 pin_infos->tpm_i2c_buffer[1] = NULL;
797 }
798 if (pin_infos->tpm_i2c_buffer[0] != NULL) {
799 kzfree(pin_infos->tpm_i2c_buffer[0]);
800 pin_infos->tpm_i2c_buffer[0] = NULL;
801 }
802 }
803
804 return 0;
805}
806
807#ifdef CONFIG_PM_SLEEP
808
809
810
811
812
813
814
815
816
817static int tpm_st33_i2c_pm_suspend(struct device *dev)
818{
819 struct tpm_chip *chip = dev_get_drvdata(dev);
820 struct st33zp24_platform_data *pin_infos = dev->platform_data;
821 int ret = 0;
822
823 if (power_mgt) {
824 gpio_set_value(pin_infos->io_lpcpd, 0);
825 } else {
826 if (chip->data_buffer == NULL)
827 chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
828 ret = tpm_pm_suspend(dev);
829 }
830 return ret;
831}
832
833
834
835
836
837
838static int tpm_st33_i2c_pm_resume(struct device *dev)
839{
840 struct tpm_chip *chip = dev_get_drvdata(dev);
841 struct st33zp24_platform_data *pin_infos = dev->platform_data;
842
843 int ret = 0;
844
845 if (power_mgt) {
846 gpio_set_value(pin_infos->io_lpcpd, 1);
847 ret = wait_for_serirq_timeout(chip,
848 (chip->vendor.status(chip) &
849 TPM_STS_VALID) == TPM_STS_VALID,
850 chip->vendor.timeout_b);
851 } else {
852 if (chip->data_buffer == NULL)
853 chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
854 ret = tpm_pm_resume(dev);
855 if (!ret)
856 tpm_do_selftest(chip);
857 }
858 return ret;
859}
860#endif
861
862static const struct i2c_device_id tpm_st33_i2c_id[] = {
863 {TPM_ST33_I2C, 0},
864 {}
865};
866MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id);
867static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend,
868 tpm_st33_i2c_pm_resume);
869static struct i2c_driver tpm_st33_i2c_driver = {
870 .driver = {
871 .owner = THIS_MODULE,
872 .name = TPM_ST33_I2C,
873 .pm = &tpm_st33_i2c_ops,
874 },
875 .probe = tpm_st33_i2c_probe,
876 .remove = tpm_st33_i2c_remove,
877 .id_table = tpm_st33_i2c_id
878};
879
880module_i2c_driver(tpm_st33_i2c_driver);
881
882MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)");
883MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
884MODULE_VERSION("1.2.0");
885MODULE_LICENSE("GPL");
886