File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c
new file mode 100644
index 0000000..f2aa99e
--- /dev/null
+++ b/drivers/char/tpm/tpm_i2c_infineon.c
@@ -0,0 +1,723 @@
+/*
+ * Copyright (C) 2012,2013 Infineon Technologies
+ *
+ * Authors:
+ * Peter Huewe <peter.huewe@infineon.com>
+ *
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at www.trustedcomputinggroup.org
+ *
+ * This device driver implements the TPM interface as defined in
+ * the TCG TPM Interface Spec version 1.2, revision 1.0 and the
+ * Infineon I2C Protocol Stack Specification v0.20.
+ *
+ * It is based on the original tpm_tis device driver from Leendert van
+ * Dorn and Kyleen Hall.
+ *
+ * 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/i2c.h>
+#include <linux/module.h>
+#include <linux/wait.h>
+#include "tpm.h"
+
+/* max. buffer size supported by our TPM */
+#define TPM_BUFSIZE 1260
+
+/* max. number of iterations after I2C NAK */
+#define MAX_COUNT 3
+
+#define SLEEP_DURATION_LOW 55
+#define SLEEP_DURATION_HI 65
+
+/* max. number of iterations after I2C NAK for 'long' commands
+ * we need this especially for sending TPM_READY, since the cleanup after the
+ * transtion to the ready state may take some time, but it is unpredictable
+ * how long it will take.
+ */
+#define MAX_COUNT_LONG 50
+
+#define SLEEP_DURATION_LONG_LOW 200
+#define SLEEP_DURATION_LONG_HI 220
+
+/* After sending TPM_READY to 'reset' the TPM we have to sleep even longer */
+#define SLEEP_DURATION_RESET_LOW 2400
+#define SLEEP_DURATION_RESET_HI 2600
+
+/* we want to use usleep_range instead of msleep for the 5ms TPM_TIMEOUT */
+#define TPM_TIMEOUT_US_LOW (TPM_TIMEOUT * 1000)
+#define TPM_TIMEOUT_US_HI (TPM_TIMEOUT_US_LOW + 2000)
+
+/* expected value for DIDVID register */
+#define TPM_TIS_I2C_DID_VID_9635 0xd1150b00L
+#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
+
+enum i2c_chip_type {
+ SLB9635,
+ SLB9645,
+ UNKNOWN,
+};
+
+/* Structure to store I2C TPM specific stuff */
+struct tpm_inf_dev {
+ struct i2c_client *client;
+ u8 buf[TPM_BUFSIZE + sizeof(u8)]; /* max. buffer size + addr */
+ struct tpm_chip *chip;
+ enum i2c_chip_type chip_type;
+};
+
+static struct tpm_inf_dev tpm_dev;
+
+/*
+ * iic_tpm_read() - read from TPM register
+ * @addr: register address to read from
+ * @buffer: provided by caller
+ * @len: number of bytes to read
+ *
+ * Read len bytes from TPM register and put them into
+ * buffer (little-endian format, i.e. first byte is put into buffer[0]).
+ *
+ * NOTE: TPM is big-endian for multi-byte values. Multi-byte
+ * values have to be swapped.
+ *
+ * NOTE: We can't unfortunately use the combined read/write functions
+ * provided by the i2c core as the TPM currently does not support the
+ * repeated start condition and due to it's special requirements.
+ * The i2c_smbus* functions do not work for this chip.
+ *
+ * Return -EIO on error, 0 on success.
+ */
+static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
+{
+
+ struct i2c_msg msg1 = {
+ .addr = tpm_dev.client->addr,
+ .len = 1,
+ .buf = &addr
+ };
+ struct i2c_msg msg2 = {
+ .addr = tpm_dev.client->addr,
+ .flags = I2C_M_RD,
+ .len = len,
+ .buf = buffer
+ };
+ struct i2c_msg msgs[] = {msg1, msg2};
+
+ int rc = 0;
+ int count;
+
+ /* Lock the adapter for the duration of the whole sequence. */
+ if (!tpm_dev.client->adapter->algo->master_xfer)
+ return -EOPNOTSUPP;
+ i2c_lock_adapter(tpm_dev.client->adapter);
+
+ if (tpm_dev.chip_type == SLB9645) {
+ /* use a combined read for newer chips
+ * unfortunately the smbus functions are not suitable due to
+ * the 32 byte limit of the smbus.
+ * retries should usually not be needed, but are kept just to
+ * be on the safe side.
+ */
+ for (count = 0; count < MAX_COUNT; count++) {
+ rc = __i2c_transfer(tpm_dev.client->adapter, msgs, 2);
+ if (rc > 0)
+ break; /* break here to skip sleep */
+ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
+ }
+ } else {
+ /* slb9635 protocol should work in all cases */
+ for (count = 0; count < MAX_COUNT; count++) {
+ rc = __i2c_transfer(tpm_dev.client->adapter, &msg1, 1);
+ if (rc > 0)
+ break; /* break here to skip sleep */
+
+ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
+ }
+
+ if (rc <= 0)
+ goto out;
+
+ /* After the TPM has successfully received the register address
+ * it needs some time, thus we're sleeping here again, before
+ * retrieving the data
+ */
+ for (count = 0; count < MAX_COUNT; count++) {
+ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
+ rc = __i2c_transfer(tpm_dev.client->adapter, &msg2, 1);
+ if (rc > 0)
+ break;
+ }
+ }
+
+out:
+ i2c_unlock_adapter(tpm_dev.client->adapter);
+ /* take care of 'guard time' */
+ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
+
+ /* __i2c_transfer returns the number of successfully transferred
+ * messages.
+ * So rc should be greater than 0 here otherwise we have an error.
+ */
+ if (rc <= 0)
+ return -EIO;
+
+ return 0;
+}
+
+static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
+ unsigned int sleep_low,
+ unsigned int sleep_hi, u8 max_count)
+{
+ int rc = -EIO;
+ int count;
+
+ struct i2c_msg msg1 = {
+ .addr = tpm_dev.client->addr,
+ .len = len + 1,
+ .buf = tpm_dev.buf
+ };
+
+ if (len > TPM_BUFSIZE)
+ return -EINVAL;
+
+ if (!tpm_dev.client->adapter->algo->master_xfer)
+ return -EOPNOTSUPP;
+ i2c_lock_adapter(tpm_dev.client->adapter);
+
+ /* prepend the 'register address' to the buffer */
+ tpm_dev.buf[0] = addr;
+ memcpy(&(tpm_dev.buf[1]), buffer, len);
+
+ /*
+ * NOTE: We have to use these special mechanisms here and unfortunately
+ * cannot rely on the standard behavior of i2c_transfer.
+ * Even for newer chips the smbus functions are not
+ * suitable due to the 32 byte limit of the smbus.
+ */
+ for (count = 0; count < max_count; count++) {
+ rc = __i2c_transfer(tpm_dev.client->adapter, &msg1, 1);
+ if (rc > 0)
+ break;
+ usleep_range(sleep_low, sleep_hi);
+ }
+
+ i2c_unlock_adapter(tpm_dev.client->adapter);
+ /* take care of 'guard time' */
+ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
+
+ /* __i2c_transfer returns the number of successfully transferred
+ * messages.
+ * So rc should be greater than 0 here otherwise we have an error.
+ */
+ if (rc <= 0)
+ return -EIO;
+
+ return 0;
+}
+
+/*
+ * iic_tpm_write() - write to TPM register
+ * @addr: register address to write to
+ * @buffer: containing data to be written
+ * @len: number of bytes to write
+ *
+ * Write len bytes from provided buffer to TPM register (little
+ * endian format, i.e. buffer[0] is written as first byte).
+ *
+ * NOTE: TPM is big-endian for multi-byte values. Multi-byte
+ * values have to be swapped.
+ *
+ * NOTE: use this function instead of the iic_tpm_write_generic function.
+ *
+ * Return -EIO on error, 0 on success
+ */
+static int iic_tpm_write(u8 addr, u8 *buffer, size_t len)
+{
+ return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LOW,
+ SLEEP_DURATION_HI, MAX_COUNT);
+}
+
+/*
+ * This function is needed especially for the cleanup situation after
+ * sending TPM_READY
+ * */
+static int iic_tpm_write_long(u8 addr, u8 *buffer, size_t len)
+{
+ return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LONG_LOW,
+ SLEEP_DURATION_LONG_HI, MAX_COUNT_LONG);
+}
+
+enum tis_access {
+ TPM_ACCESS_VALID = 0x80,
+ TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
+ TPM_ACCESS_REQUEST_PENDING = 0x04,
+ TPM_ACCESS_REQUEST_USE = 0x02,
+};
+
+enum tis_status {
+ TPM_STS_VALID = 0x80,
+ TPM_STS_COMMAND_READY = 0x40,
+ TPM_STS_GO = 0x20,
+ TPM_STS_DATA_AVAIL = 0x10,
+ TPM_STS_DATA_EXPECT = 0x08,
+};
+
+enum tis_defaults {
+ TIS_SHORT_TIMEOUT = 750, /* ms */
+ TIS_LONG_TIMEOUT = 2000, /* 2 sec */
+};
+
+#define TPM_ACCESS(l) (0x0000 | ((l) << 4))
+#define TPM_STS(l) (0x0001 | ((l) << 4))
+#define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4))
+#define TPM_DID_VID(l) (0x0006 | ((l) << 4))
+
+static int check_locality(struct tpm_chip *chip, int loc)
+{
+ u8 buf;
+ int rc;
+
+ rc = iic_tpm_read(TPM_ACCESS(loc), &buf, 1);
+ if (rc < 0)
+ return rc;
+
+ if ((buf & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
+ (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
+ chip->vendor.locality = loc;
+ return loc;
+ }
+
+ return -EIO;
+}
+
+/* implementation similar to tpm_tis */
+static void release_locality(struct tpm_chip *chip, int loc, int force)
+{
+ u8 buf;
+ if (iic_tpm_read(TPM_ACCESS(loc), &buf, 1) < 0)
+ return;
+
+ if (force || (buf & (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
+ (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) {
+ buf = TPM_ACCESS_ACTIVE_LOCALITY;
+ iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
+ }
+}
+
+static int request_locality(struct tpm_chip *chip, int loc)
+{
+ unsigned long stop;
+ u8 buf = TPM_ACCESS_REQUEST_USE;
+
+ if (check_locality(chip, loc) >= 0)
+ return loc;
+
+ iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
+
+ /* wait for burstcount */
+ stop = jiffies + chip->vendor.timeout_a;
+ do {
+ if (check_locality(chip, loc) >= 0)
+ return loc;
+ usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
+ } while (time_before(jiffies, stop));
+
+ return -ETIME;
+}
+
+static u8 tpm_tis_i2c_status(struct tpm_chip *chip)
+{
+ /* NOTE: since I2C read may fail, return 0 in this case --> time-out */
+ u8 buf = 0xFF;
+ u8 i = 0;
+
+ do {
+ if (iic_tpm_read(TPM_STS(chip->vendor.locality), &buf, 1) < 0)
+ return 0;
+
+ i++;
+ /* if locallity is set STS should not be 0xFF */
+ } while ((buf == 0xFF) && i < 10);
+
+ return buf;
+}
+
+static void tpm_tis_i2c_ready(struct tpm_chip *chip)
+{
+ /* this causes the current command to be aborted */
+ u8 buf = TPM_STS_COMMAND_READY;
+ iic_tpm_write_long(TPM_STS(chip->vendor.locality), &buf, 1);
+}
+
+static ssize_t get_burstcount(struct tpm_chip *chip)
+{
+ unsigned long stop;
+ ssize_t burstcnt;
+ u8 buf[3];
+
+ /* wait for burstcount */
+ /* which timeout value, spec has 2 answers (c & d) */
+ stop = jiffies + chip->vendor.timeout_d;
+ do {
+ /* Note: STS is little endian */
+ if (iic_tpm_read(TPM_STS(chip->vendor.locality)+1, buf, 3) < 0)
+ burstcnt = 0;
+ else
+ burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
+
+ if (burstcnt)
+ return burstcnt;
+
+ usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
+ } while (time_before(jiffies, stop));
+ return -EBUSY;
+}
+
+static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
+ int *status)
+{
+ unsigned long stop;
+
+ /* check current status */
+ *status = tpm_tis_i2c_status(chip);
+ if ((*status != 0xFF) && (*status & mask) == mask)
+ return 0;
+
+ stop = jiffies + timeout;
+ do {
+ /* since we just checked the status, give the TPM some time */
+ usleep_range(TPM_TIMEOUT_US_LOW, TPM_TIMEOUT_US_HI);
+ *status = tpm_tis_i2c_status(chip);
+ if ((*status & mask) == mask)
+ return 0;
+
+ } while (time_before(jiffies, stop));
+
+ return -ETIME;
+}
+
+static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
+{
+ size_t size = 0;
+ ssize_t burstcnt;
+ u8 retries = 0;
+ int rc;
+
+ while (size < count) {
+ burstcnt = get_burstcount(chip);
+
+ /* burstcnt < 0 = TPM is busy */
+ if (burstcnt < 0)
+ return burstcnt;
+
+ /* limit received data to max. left */
+ if (burstcnt > (count - size))
+ burstcnt = count - size;
+
+ rc = iic_tpm_read(TPM_DATA_FIFO(chip->vendor.locality),
+ &(buf[size]), burstcnt);
+ if (rc == 0)
+ size += burstcnt;
+ else if (rc < 0)
+ retries++;
+
+ /* avoid endless loop in case of broken HW */
+ if (retries > MAX_COUNT_LONG)
+ return -EIO;
+ }
+ return size;
+}
+
+static int tpm_tis_i2c_recv(struct tpm_chip *chip, u8 *buf, size_t count)
+{
+ int size = 0;
+ int expected, status;
+
+ if (count < TPM_HEADER_SIZE) {
+ size = -EIO;
+ goto out;
+ }
+
+ /* read first 10 bytes, including tag, paramsize, and result */
+ size = recv_data(chip, buf, TPM_HEADER_SIZE);
+ if (size < TPM_HEADER_SIZE) {
+ dev_err(&chip->dev, "Unable to read header\n");
+ goto out;
+ }
+
+ expected = be32_to_cpu(*(__be32 *)(buf + 2));
+ if ((size_t) expected > count) {
+ size = -EIO;
+ goto out;
+ }
+
+ size += recv_data(chip, &buf[TPM_HEADER_SIZE],
+ expected - TPM_HEADER_SIZE);
+ if (size < expected) {
+ dev_err(&chip->dev, "Unable to read remainder of result\n");
+ size = -ETIME;
+ goto out;
+ }
+
+ wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status);
+ if (status & TPM_STS_DATA_AVAIL) { /* retry? */
+ dev_err(&chip->dev, "Error left over data\n");
+ size = -EIO;
+ goto out;
+ }
+
+out:
+ tpm_tis_i2c_ready(chip);
+ /* The TPM needs some time to clean up here,
+ * so we sleep rather than keeping the bus busy
+ */
+ usleep_range(SLEEP_DURATION_RESET_LOW, SLEEP_DURATION_RESET_HI);
+ release_locality(chip, chip->vendor.locality, 0);
+ return size;
+}
+
+static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
+{
+ int rc, status;
+ ssize_t burstcnt;
+ size_t count = 0;
+ u8 retries = 0;
+ u8 sts = TPM_STS_GO;
+
+ if (len > TPM_BUFSIZE)
+ return -E2BIG; /* command is too long for our tpm, sorry */
+
+ if (request_locality(chip, 0) < 0)
+ return -EBUSY;
+
+ status = tpm_tis_i2c_status(chip);
+ if ((status & TPM_STS_COMMAND_READY) == 0) {
+ tpm_tis_i2c_ready(chip);
+ if (wait_for_stat
+ (chip, TPM_STS_COMMAND_READY,
+ chip->vendor.timeout_b, &status) < 0) {
+ rc = -ETIME;
+ goto out_err;
+ }
+ }
+
+ while (count < len - 1) {
+ burstcnt = get_burstcount(chip);
+
+ /* burstcnt < 0 = TPM is busy */
+ if (burstcnt < 0)
+ return burstcnt;
+
+ if (burstcnt > (len - 1 - count))
+ burstcnt = len - 1 - count;
+
+ rc = iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality),
+ &(buf[count]), burstcnt);
+ if (rc == 0)
+ count += burstcnt;
+ else if (rc < 0)
+ retries++;
+
+ /* avoid endless loop in case of broken HW */
+ if (retries > MAX_COUNT_LONG) {
+ rc = -EIO;
+ goto out_err;
+ }
+
+ wait_for_stat(chip, TPM_STS_VALID,
+ chip->vendor.timeout_c, &status);
+
+ if ((status & TPM_STS_DATA_EXPECT) == 0) {
+ rc = -EIO;
+ goto out_err;
+ }
+ }
+
+ /* write last byte */
+ iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality), &(buf[count]), 1);
+ wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c, &status);
+ if ((status & TPM_STS_DATA_EXPECT) != 0) {
+ rc = -EIO;
+ goto out_err;
+ }
+
+ /* go and do it */
+ iic_tpm_write(TPM_STS(chip->vendor.locality), &sts, 1);
+
+ return len;
+out_err:
+ tpm_tis_i2c_ready(chip);
+ /* The TPM needs some time to clean up here,
+ * so we sleep rather than keeping the bus busy
+ */
+ usleep_range(SLEEP_DURATION_RESET_LOW, SLEEP_DURATION_RESET_HI);
+ release_locality(chip, chip->vendor.locality, 0);
+ return rc;
+}
+
+static bool tpm_tis_i2c_req_canceled(struct tpm_chip *chip, u8 status)
+{
+ return (status == TPM_STS_COMMAND_READY);
+}
+
+static const struct tpm_class_ops tpm_tis_i2c = {
+ .status = tpm_tis_i2c_status,
+ .recv = tpm_tis_i2c_recv,
+ .send = tpm_tis_i2c_send,
+ .cancel = tpm_tis_i2c_ready,
+ .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ .req_canceled = tpm_tis_i2c_req_canceled,
+};
+
+static int tpm_tis_i2c_init(struct device *dev)
+{
+ u32 vendor;
+ int rc = 0;
+ struct tpm_chip *chip;
+
+ chip = tpmm_chip_alloc(dev, &tpm_tis_i2c);
+ if (IS_ERR(chip))
+ return PTR_ERR(chip);
+
+ /* Disable interrupts */
+ chip->vendor.irq = 0;
+
+ /* Default timeouts */
+ chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+ chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
+ chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+ chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
+
+ if (request_locality(chip, 0) != 0) {
+ dev_err(dev, "could not request locality\n");
+ rc = -ENODEV;
+ goto out_err;
+ }
+
+ /* read four bytes from DID_VID register */
+ if (iic_tpm_read(TPM_DID_VID(0), (u8 *)&vendor, 4) < 0) {
+ dev_err(dev, "could not read vendor id\n");
+ rc = -EIO;
+ goto out_release;
+ }
+
+ if (vendor == TPM_TIS_I2C_DID_VID_9645) {
+ tpm_dev.chip_type = SLB9645;
+ } else if (vendor == TPM_TIS_I2C_DID_VID_9635) {
+ tpm_dev.chip_type = SLB9635;
+ } else {
+ dev_err(dev, "vendor id did not match! ID was %08x\n", vendor);
+ rc = -ENODEV;
+ goto out_release;
+ }
+
+ dev_info(dev, "1.2 TPM (device-id 0x%X)\n", vendor >> 16);
+
+ INIT_LIST_HEAD(&chip->vendor.list);
+ tpm_dev.chip = chip;
+
+ tpm_get_timeouts(chip);
+ tpm_do_selftest(chip);
+
+ return tpm_chip_register(chip);
+out_release:
+ release_locality(chip, chip->vendor.locality, 1);
+ tpm_dev.client = NULL;
+out_err:
+ return rc;
+}
+
+static const struct i2c_device_id tpm_tis_i2c_table[] = {
+ {"tpm_i2c_infineon", 0},
+ {"slb9635tt", 0},
+ {"slb9645tt", 1},
+ {},
+};
+
+MODULE_DEVICE_TABLE(i2c, tpm_tis_i2c_table);
+
+#ifdef CONFIG_OF
+static const struct of_device_id tpm_tis_i2c_of_match[] = {
+ {
+ .name = "tpm_i2c_infineon",
+ .type = "tpm",
+ .compatible = "infineon,tpm_i2c_infineon",
+ .data = (void *)0
+ },
+ {
+ .name = "slb9635tt",
+ .type = "tpm",
+ .compatible = "infineon,slb9635tt",
+ .data = (void *)0
+ },
+ {
+ .name = "slb9645tt",
+ .type = "tpm",
+ .compatible = "infineon,slb9645tt",
+ .data = (void *)1
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, tpm_tis_i2c_of_match);
+#endif
+
+static SIMPLE_DEV_PM_OPS(tpm_tis_i2c_ops, tpm_pm_suspend, tpm_pm_resume);
+
+static int tpm_tis_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int rc;
+ struct device *dev = &(client->dev);
+
+ if (tpm_dev.client != NULL) {
+ dev_err(dev, "This driver only supports one client at a time\n");
+ return -EBUSY; /* We only support one client */
+ }
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(dev, "no algorithms associated to the i2c bus\n");
+ return -ENODEV;
+ }
+
+ tpm_dev.client = client;
+ rc = tpm_tis_i2c_init(&client->dev);
+ if (rc != 0) {
+ tpm_dev.client = NULL;
+ rc = -ENODEV;
+ }
+ return rc;
+}
+
+static int tpm_tis_i2c_remove(struct i2c_client *client)
+{
+ struct tpm_chip *chip = tpm_dev.chip;
+
+ tpm_chip_unregister(chip);
+ release_locality(chip, chip->vendor.locality, 1);
+ tpm_dev.client = NULL;
+
+ return 0;
+}
+
+static struct i2c_driver tpm_tis_i2c_driver = {
+ .id_table = tpm_tis_i2c_table,
+ .probe = tpm_tis_i2c_probe,
+ .remove = tpm_tis_i2c_remove,
+ .driver = {
+ .name = "tpm_i2c_infineon",
+ .pm = &tpm_tis_i2c_ops,
+ .of_match_table = of_match_ptr(tpm_tis_i2c_of_match),
+ },
+};
+
+module_i2c_driver(tpm_tis_i2c_driver);
+MODULE_AUTHOR("Peter Huewe <peter.huewe@infineon.com>");
+MODULE_DESCRIPTION("TPM TIS I2C Infineon Driver");
+MODULE_VERSION("2.2.0");
+MODULE_LICENSE("GPL");