2 * Copyright (C) 2004 IBM Corporation
5 * Leendert van Doorn <leendert@watson.ibm.com>
6 * Dave Safford <safford@watson.ibm.com>
7 * Reiner Sailer <sailer@watson.ibm.com>
8 * Kylene Hall <kjhall@us.ibm.com>
10 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
12 * Device driver for TCG/TCPA TPM (trusted platform module).
13 * Specifications at www.trustedcomputinggroup.org
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation, version 2 of the
20 * Note, the TPM chip is not interrupt driven (only polling)
21 * and can have very long timeouts (minutes!). Hence the unusual
26 #include <linux/poll.h>
27 #include <linux/mutex.h>
28 #include <linux/spinlock.h>
29 #include <linux/smp_lock.h>
34 TPM_MINOR = 224, /* officially assigned */
36 TPM_NUM_DEVICES = 256,
46 #define TPM_MAX_ORDINAL 243
47 #define TPM_MAX_PROTECTED_ORDINAL 12
48 #define TPM_PROTECTED_ORDINAL_MASK 0xFF
50 static LIST_HEAD(tpm_chip_list);
51 static DEFINE_SPINLOCK(driver_lock);
52 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
55 * Array with one entry per ordinal defining the maximum amount
56 * of time the chip could take to return the result. The ordinal
57 * designation of short, medium or long is defined in a table in
58 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
59 * values of the SHORT, MEDIUM, and LONG durations are retrieved
60 * from the chip during initialization with a call to tpm_get_timeouts.
62 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
63 TPM_UNDEFINED, /* 0 */
68 TPM_UNDEFINED, /* 5 */
77 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
78 TPM_UNDEFINED, /* 0 */
83 TPM_UNDEFINED, /* 5 */
133 TPM_UNDEFINED, /* 55 */
153 TPM_UNDEFINED, /* 75 */
163 TPM_UNDEFINED, /* 85 */
173 TPM_UNDEFINED, /* 95 */
178 TPM_MEDIUM, /* 100 */
183 TPM_UNDEFINED, /* 105 */
213 TPM_UNDEFINED, /* 135 */
223 TPM_UNDEFINED, /* 145 */
233 TPM_UNDEFINED, /* 155 */
243 TPM_UNDEFINED, /* 165 */
253 TPM_UNDEFINED, /* 175 */
258 TPM_MEDIUM, /* 180 */
263 TPM_MEDIUM, /* 185 */
268 TPM_UNDEFINED, /* 190 */
273 TPM_UNDEFINED, /* 195 */
288 TPM_MEDIUM, /* 210 */
293 TPM_UNDEFINED, /* 215 */
303 TPM_UNDEFINED, /* 225 */
313 TPM_UNDEFINED, /* 235 */
323 static void user_reader_timeout(unsigned long ptr)
325 struct tpm_chip *chip = (struct tpm_chip *) ptr;
327 schedule_work(&chip->work);
330 static void timeout_work(struct work_struct *work)
332 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
334 mutex_lock(&chip->buffer_mutex);
335 atomic_set(&chip->data_pending, 0);
336 memset(chip->data_buffer, 0, TPM_BUFSIZE);
337 mutex_unlock(&chip->buffer_mutex);
341 * Returns max number of jiffies to wait
343 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
346 int duration_idx = TPM_UNDEFINED;
349 if (ordinal < TPM_MAX_ORDINAL)
350 duration_idx = tpm_ordinal_duration[ordinal];
351 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
352 TPM_MAX_PROTECTED_ORDINAL)
354 tpm_protected_ordinal_duration[ordinal &
355 TPM_PROTECTED_ORDINAL_MASK];
357 if (duration_idx != TPM_UNDEFINED)
358 duration = chip->vendor.duration[duration_idx];
364 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
367 * Internal kernel interface to transmit TPM commands
369 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
376 count = be32_to_cpu(*((__be32 *) (buf + 2)));
377 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
380 if (count > bufsiz) {
382 "invalid count value %x %zx \n", count, bufsiz);
386 mutex_lock(&chip->tpm_mutex);
388 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
390 "tpm_transmit: tpm_send: error %zd\n", rc);
394 if (chip->vendor.irq)
397 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
399 u8 status = chip->vendor.status(chip);
400 if ((status & chip->vendor.req_complete_mask) ==
401 chip->vendor.req_complete_val)
404 if ((status == chip->vendor.req_canceled)) {
405 dev_err(chip->dev, "Operation Canceled\n");
410 msleep(TPM_TIMEOUT); /* CHECK */
412 } while (time_before(jiffies, stop));
414 chip->vendor.cancel(chip);
415 dev_err(chip->dev, "Operation Timed out\n");
420 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
423 "tpm_transmit: tpm_recv: error %zd\n", rc);
425 mutex_unlock(&chip->tpm_mutex);
429 #define TPM_DIGEST_SIZE 20
430 #define TPM_ERROR_SIZE 10
431 #define TPM_RET_CODE_IDX 6
432 #define TPM_GET_CAP_RET_SIZE_IDX 10
433 #define TPM_GET_CAP_RET_UINT32_1_IDX 14
434 #define TPM_GET_CAP_RET_UINT32_2_IDX 18
435 #define TPM_GET_CAP_RET_UINT32_3_IDX 22
436 #define TPM_GET_CAP_RET_UINT32_4_IDX 26
437 #define TPM_GET_CAP_PERM_DISABLE_IDX 16
438 #define TPM_GET_CAP_PERM_INACTIVE_IDX 18
439 #define TPM_GET_CAP_RET_BOOL_1_IDX 14
440 #define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
442 #define TPM_CAP_IDX 13
443 #define TPM_CAP_SUBCAP_IDX 21
445 enum tpm_capabilities {
450 enum tpm_sub_capabilities {
451 TPM_CAP_PROP_PCR = 0x1,
452 TPM_CAP_PROP_MANUFACTURER = 0x3,
453 TPM_CAP_FLAG_PERM = 0x8,
454 TPM_CAP_FLAG_VOL = 0x9,
455 TPM_CAP_PROP_OWNER = 0x11,
456 TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
457 TPM_CAP_PROP_TIS_DURATION = 0x20,
461 * This is a semi generic GetCapability command for use
462 * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
463 * and their associated sub_capabilities.
466 static const u8 tpm_cap[] = {
467 0, 193, /* TPM_TAG_RQU_COMMAND */
468 0, 0, 0, 22, /* length */
469 0, 0, 0, 101, /* TPM_ORD_GetCapability */
470 0, 0, 0, 0, /* TPM_CAP_<TYPE> */
471 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */
472 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */
475 static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
480 len = tpm_transmit(chip, data, len);
483 if (len == TPM_ERROR_SIZE) {
484 err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
485 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
491 void tpm_gen_interrupt(struct tpm_chip *chip)
493 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
496 memcpy(data, tpm_cap, sizeof(tpm_cap));
497 data[TPM_CAP_IDX] = TPM_CAP_PROP;
498 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
500 rc = transmit_cmd(chip, data, sizeof(data),
501 "attempting to determine the timeouts");
503 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
505 void tpm_get_timeouts(struct tpm_chip *chip)
507 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
511 memcpy(data, tpm_cap, sizeof(tpm_cap));
512 data[TPM_CAP_IDX] = TPM_CAP_PROP;
513 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
515 rc = transmit_cmd(chip, data, sizeof(data),
516 "attempting to determine the timeouts");
520 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
524 /* Don't overwrite default if value is 0 */
526 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
528 chip->vendor.timeout_a = msecs_to_jiffies(timeout);
530 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
532 chip->vendor.timeout_b = msecs_to_jiffies(timeout);
534 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
536 chip->vendor.timeout_c = msecs_to_jiffies(timeout);
538 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
540 chip->vendor.timeout_d = msecs_to_jiffies(timeout);
543 memcpy(data, tpm_cap, sizeof(tpm_cap));
544 data[TPM_CAP_IDX] = TPM_CAP_PROP;
545 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
547 rc = transmit_cmd(chip, data, sizeof(data),
548 "attempting to determine the durations");
552 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
556 chip->vendor.duration[TPM_SHORT] =
557 msecs_to_jiffies(be32_to_cpu
558 (*((__be32 *) (data +
559 TPM_GET_CAP_RET_UINT32_1_IDX))));
560 chip->vendor.duration[TPM_MEDIUM] =
561 msecs_to_jiffies(be32_to_cpu
562 (*((__be32 *) (data +
563 TPM_GET_CAP_RET_UINT32_2_IDX))));
564 chip->vendor.duration[TPM_LONG] =
565 msecs_to_jiffies(be32_to_cpu
566 (*((__be32 *) (data +
567 TPM_GET_CAP_RET_UINT32_3_IDX))));
569 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
571 void tpm_continue_selftest(struct tpm_chip *chip)
574 0, 193, /* TPM_TAG_RQU_COMMAND */
575 0, 0, 0, 10, /* length */
576 0, 0, 0, 83, /* TPM_ORD_GetCapability */
579 tpm_transmit(chip, data, sizeof(data));
581 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
583 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
586 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
589 struct tpm_chip *chip = dev_get_drvdata(dev);
593 memcpy(data, tpm_cap, sizeof(tpm_cap));
594 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
595 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
597 rc = transmit_cmd(chip, data, sizeof(data),
598 "attemtping to determine the permanent state");
601 return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
603 EXPORT_SYMBOL_GPL(tpm_show_enabled);
605 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
608 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
611 struct tpm_chip *chip = dev_get_drvdata(dev);
615 memcpy(data, tpm_cap, sizeof(tpm_cap));
616 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
617 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
619 rc = transmit_cmd(chip, data, sizeof(data),
620 "attemtping to determine the permanent state");
623 return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
625 EXPORT_SYMBOL_GPL(tpm_show_active);
627 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
630 u8 data[sizeof(tpm_cap)];
633 struct tpm_chip *chip = dev_get_drvdata(dev);
637 memcpy(data, tpm_cap, sizeof(tpm_cap));
638 data[TPM_CAP_IDX] = TPM_CAP_PROP;
639 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
641 rc = transmit_cmd(chip, data, sizeof(data),
642 "attempting to determine the owner state");
645 return sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
647 EXPORT_SYMBOL_GPL(tpm_show_owned);
649 ssize_t tpm_show_temp_deactivated(struct device * dev,
650 struct device_attribute * attr, char *buf)
652 u8 data[sizeof(tpm_cap)];
655 struct tpm_chip *chip = dev_get_drvdata(dev);
659 memcpy(data, tpm_cap, sizeof(tpm_cap));
660 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
661 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
663 rc = transmit_cmd(chip, data, sizeof(data),
664 "attempting to determine the temporary state");
667 return sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
669 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
671 static const u8 pcrread[] = {
672 0, 193, /* TPM_TAG_RQU_COMMAND */
673 0, 0, 0, 14, /* length */
674 0, 0, 0, 21, /* TPM_ORD_PcrRead */
675 0, 0, 0, 0 /* PCR index */
678 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
681 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(pcrread)), 30)];
687 struct tpm_chip *chip = dev_get_drvdata(dev);
691 memcpy(data, tpm_cap, sizeof(tpm_cap));
692 data[TPM_CAP_IDX] = TPM_CAP_PROP;
693 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
695 rc = transmit_cmd(chip, data, sizeof(data),
696 "attempting to determine the number of PCRS");
700 num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
701 for (i = 0; i < num_pcrs; i++) {
702 memcpy(data, pcrread, sizeof(pcrread));
703 index = cpu_to_be32(i);
704 memcpy(data + 10, &index, 4);
705 rc = transmit_cmd(chip, data, sizeof(data),
706 "attempting to read a PCR");
709 str += sprintf(str, "PCR-%02d: ", i);
710 for (j = 0; j < TPM_DIGEST_SIZE; j++)
711 str += sprintf(str, "%02X ", *(data + 10 + j));
712 str += sprintf(str, "\n");
717 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
719 #define READ_PUBEK_RESULT_SIZE 314
720 static const u8 readpubek[] = {
721 0, 193, /* TPM_TAG_RQU_COMMAND */
722 0, 0, 0, 30, /* length */
723 0, 0, 0, 124, /* TPM_ORD_ReadPubek */
726 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
734 struct tpm_chip *chip = dev_get_drvdata(dev);
738 data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
742 memcpy(data, readpubek, sizeof(readpubek));
744 err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
745 "attempting to read the PUBEK");
750 ignore header 10 bytes
751 algorithm 32 bits (1 == RSA )
754 parameters (RSA 12->bytes: keybit, #primes, expbit)
757 ignore checksum 20 bytes
762 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
763 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
764 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
765 "Modulus length: %d\nModulus: \n",
766 data[10], data[11], data[12], data[13], data[14],
767 data[15], data[16], data[17], data[22], data[23],
768 data[24], data[25], data[26], data[27], data[28],
769 data[29], data[30], data[31], data[32], data[33],
770 be32_to_cpu(*((__be32 *) (data + 34))));
772 for (i = 0; i < 256; i++) {
773 str += sprintf(str, "%02X ", data[i + 38]);
774 if ((i + 1) % 16 == 0)
775 str += sprintf(str, "\n");
782 EXPORT_SYMBOL_GPL(tpm_show_pubek);
784 #define CAP_VERSION_1_1 6
785 #define CAP_VERSION_1_2 0x1A
786 #define CAP_VERSION_IDX 13
787 static const u8 cap_version[] = {
788 0, 193, /* TPM_TAG_RQU_COMMAND */
789 0, 0, 0, 18, /* length */
790 0, 0, 0, 101, /* TPM_ORD_GetCapability */
795 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
798 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
802 struct tpm_chip *chip = dev_get_drvdata(dev);
806 memcpy(data, tpm_cap, sizeof(tpm_cap));
807 data[TPM_CAP_IDX] = TPM_CAP_PROP;
808 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
810 rc = transmit_cmd(chip, data, sizeof(data),
811 "attempting to determine the manufacturer");
815 str += sprintf(str, "Manufacturer: 0x%x\n",
816 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
818 memcpy(data, cap_version, sizeof(cap_version));
819 data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
820 rc = transmit_cmd(chip, data, sizeof(data),
821 "attempting to determine the 1.1 version");
826 "TCG version: %d.%d\nFirmware version: %d.%d\n",
827 (int) data[14], (int) data[15], (int) data[16],
833 EXPORT_SYMBOL_GPL(tpm_show_caps);
835 ssize_t tpm_show_caps_1_2(struct device * dev,
836 struct device_attribute * attr, char *buf)
838 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
842 struct tpm_chip *chip = dev_get_drvdata(dev);
846 memcpy(data, tpm_cap, sizeof(tpm_cap));
847 data[TPM_CAP_IDX] = TPM_CAP_PROP;
848 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
850 if ((len = tpm_transmit(chip, data, sizeof(data))) <=
852 dev_dbg(chip->dev, "A TPM error (%d) occurred "
853 "attempting to determine the manufacturer\n",
854 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
858 str += sprintf(str, "Manufacturer: 0x%x\n",
859 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
861 memcpy(data, cap_version, sizeof(cap_version));
862 data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
864 if ((len = tpm_transmit(chip, data, sizeof(data))) <=
866 dev_err(chip->dev, "A TPM error (%d) occurred "
867 "attempting to determine the 1.2 version\n",
868 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
872 "TCG version: %d.%d\nFirmware version: %d.%d\n",
873 (int) data[16], (int) data[17], (int) data[18],
879 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
881 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
882 const char *buf, size_t count)
884 struct tpm_chip *chip = dev_get_drvdata(dev);
888 chip->vendor.cancel(chip);
891 EXPORT_SYMBOL_GPL(tpm_store_cancel);
894 * Device file system interface to the TPM
896 int tpm_open(struct inode *inode, struct file *file)
898 int rc = 0, minor = iminor(inode);
899 struct tpm_chip *chip = NULL, *pos;
902 spin_lock(&driver_lock);
904 list_for_each_entry(pos, &tpm_chip_list, list) {
905 if (pos->vendor.miscdev.minor == minor) {
916 if (chip->num_opens) {
917 dev_dbg(chip->dev, "Another process owns this TPM\n");
923 get_device(chip->dev);
925 spin_unlock(&driver_lock);
927 chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
928 if (chip->data_buffer == NULL) {
930 put_device(chip->dev);
935 atomic_set(&chip->data_pending, 0);
937 file->private_data = chip;
942 spin_unlock(&driver_lock);
946 EXPORT_SYMBOL_GPL(tpm_open);
948 int tpm_release(struct inode *inode, struct file *file)
950 struct tpm_chip *chip = file->private_data;
952 flush_scheduled_work();
953 spin_lock(&driver_lock);
954 file->private_data = NULL;
955 del_singleshot_timer_sync(&chip->user_read_timer);
956 atomic_set(&chip->data_pending, 0);
958 put_device(chip->dev);
959 kfree(chip->data_buffer);
960 spin_unlock(&driver_lock);
963 EXPORT_SYMBOL_GPL(tpm_release);
965 ssize_t tpm_write(struct file *file, const char __user *buf,
966 size_t size, loff_t *off)
968 struct tpm_chip *chip = file->private_data;
969 int in_size = size, out_size;
971 /* cannot perform a write until the read has cleared
972 either via tpm_read or a user_read_timer timeout */
973 while (atomic_read(&chip->data_pending) != 0)
976 mutex_lock(&chip->buffer_mutex);
978 if (in_size > TPM_BUFSIZE)
979 in_size = TPM_BUFSIZE;
982 (chip->data_buffer, (void __user *) buf, in_size)) {
983 mutex_unlock(&chip->buffer_mutex);
987 /* atomic tpm command send and result receive */
988 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
990 atomic_set(&chip->data_pending, out_size);
991 mutex_unlock(&chip->buffer_mutex);
993 /* Set a timeout by which the reader must come claim the result */
994 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
998 EXPORT_SYMBOL_GPL(tpm_write);
1000 ssize_t tpm_read(struct file *file, char __user *buf,
1001 size_t size, loff_t *off)
1003 struct tpm_chip *chip = file->private_data;
1006 del_singleshot_timer_sync(&chip->user_read_timer);
1007 flush_scheduled_work();
1008 ret_size = atomic_read(&chip->data_pending);
1009 atomic_set(&chip->data_pending, 0);
1010 if (ret_size > 0) { /* relay data */
1011 if (size < ret_size)
1014 mutex_lock(&chip->buffer_mutex);
1015 if (copy_to_user(buf, chip->data_buffer, ret_size))
1017 mutex_unlock(&chip->buffer_mutex);
1022 EXPORT_SYMBOL_GPL(tpm_read);
1024 void tpm_remove_hardware(struct device *dev)
1026 struct tpm_chip *chip = dev_get_drvdata(dev);
1029 dev_err(dev, "No device data found\n");
1033 spin_lock(&driver_lock);
1035 list_del(&chip->list);
1037 spin_unlock(&driver_lock);
1039 misc_deregister(&chip->vendor.miscdev);
1041 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1042 tpm_bios_log_teardown(chip->bios_dir);
1044 /* write it this way to be explicit (chip->dev == dev) */
1045 put_device(chip->dev);
1047 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1050 * We are about to suspend. Save the TPM state
1051 * so that it can be restored.
1053 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1055 struct tpm_chip *chip = dev_get_drvdata(dev);
1057 0, 193, /* TPM_TAG_RQU_COMMAND */
1058 0, 0, 0, 10, /* blob length (in bytes) */
1059 0, 0, 0, 152 /* TPM_ORD_SaveState */
1065 tpm_transmit(chip, savestate, sizeof(savestate));
1068 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1071 * Resume from a power safe. The BIOS already restored
1074 int tpm_pm_resume(struct device *dev)
1076 struct tpm_chip *chip = dev_get_drvdata(dev);
1083 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1086 * Once all references to platform device are down to 0,
1087 * release all allocated structures.
1088 * In case vendor provided release function,
1091 static void tpm_dev_release(struct device *dev)
1093 struct tpm_chip *chip = dev_get_drvdata(dev);
1095 if (chip->vendor.release)
1096 chip->vendor.release(dev);
1100 clear_bit(chip->dev_num, dev_mask);
1101 kfree(chip->vendor.miscdev.name);
1106 * Called from tpm_<specific>.c probe function only for devices
1107 * the driver has determined it should claim. Prior to calling
1108 * this function the specific probe function has called pci_enable_device
1109 * upon errant exit from this function specific probe function should call
1110 * pci_disable_device
1112 struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific
1115 #define DEVNAME_SIZE 7
1118 struct tpm_chip *chip;
1120 /* Driver specific per-device data */
1121 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1122 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1124 if (chip == NULL || devname == NULL) {
1130 mutex_init(&chip->buffer_mutex);
1131 mutex_init(&chip->tpm_mutex);
1132 INIT_LIST_HEAD(&chip->list);
1134 INIT_WORK(&chip->work, timeout_work);
1136 setup_timer(&chip->user_read_timer, user_reader_timeout,
1137 (unsigned long)chip);
1139 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1141 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1143 if (chip->dev_num >= TPM_NUM_DEVICES) {
1144 dev_err(dev, "No available tpm device numbers\n");
1147 } else if (chip->dev_num == 0)
1148 chip->vendor.miscdev.minor = TPM_MINOR;
1150 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1152 set_bit(chip->dev_num, dev_mask);
1154 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1155 chip->vendor.miscdev.name = devname;
1157 chip->vendor.miscdev.parent = dev;
1158 chip->dev = get_device(dev);
1159 chip->release = dev->release;
1160 dev->release = tpm_dev_release;
1161 dev_set_drvdata(dev, chip);
1163 if (misc_register(&chip->vendor.miscdev)) {
1165 "unable to misc_register %s, minor %d\n",
1166 chip->vendor.miscdev.name,
1167 chip->vendor.miscdev.minor);
1168 put_device(chip->dev);
1172 spin_lock(&driver_lock);
1174 list_add(&chip->list, &tpm_chip_list);
1176 spin_unlock(&driver_lock);
1178 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1179 list_del(&chip->list);
1180 misc_deregister(&chip->vendor.miscdev);
1181 put_device(chip->dev);
1185 chip->bios_dir = tpm_bios_log_setup(devname);
1189 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1191 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1192 MODULE_DESCRIPTION("TPM Driver");
1193 MODULE_VERSION("2.0");
1194 MODULE_LICENSE("GPL");