OpenCloudOS-Kernel/drivers/char/tpm/tpm_tis_i2c_cr50.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2020 Google Inc.
*
* Based on Infineon TPM driver by Peter Huewe.
*
* cr50 is a firmware for H1 secure modules that requires special
* handling for the I2C interface.
*
* - Use an interrupt for transaction status instead of hardcoded delays.
* - Must use write+wait+read read protocol.
* - All 4 bytes of status register must be read/written at once.
* - Burst count max is 63 bytes, and burst count behaves slightly differently
* than other I2C TPMs.
* - When reading from FIFO the full burstcnt must be read instead of just
* reading header and determining the remainder.
*/
#include <linux/acpi.h>
#include <linux/completion.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include "tpm_tis_core.h"
#define TPM_CR50_MAX_BUFSIZE 64
#define TPM_CR50_TIMEOUT_SHORT_MS 2 /* Short timeout during transactions */
#define TPM_CR50_TIMEOUT_NOIRQ_MS 20 /* Timeout for TPM ready without IRQ */
#define TPM_CR50_I2C_DID_VID 0x00281ae0L /* Device and vendor ID reg value */
#define TPM_TI50_I2C_DID_VID 0x504a6666L /* Device and vendor ID reg value */
#define TPM_CR50_I2C_MAX_RETRIES 3 /* Max retries due to I2C errors */
#define TPM_CR50_I2C_RETRY_DELAY_LO 55 /* Min usecs between retries on I2C */
#define TPM_CR50_I2C_RETRY_DELAY_HI 65 /* Max usecs between retries on I2C */
#define TPM_I2C_ACCESS(l) (0x0000 | ((l) << 4))
#define TPM_I2C_STS(l) (0x0001 | ((l) << 4))
#define TPM_I2C_DATA_FIFO(l) (0x0005 | ((l) << 4))
#define TPM_I2C_DID_VID(l) (0x0006 | ((l) << 4))
/**
* struct tpm_i2c_cr50_priv_data - Driver private data.
* @irq: Irq number used for this chip.
* If irq <= 0, then a fixed timeout is used instead of waiting for irq.
* @tpm_ready: Struct used by irq handler to signal R/W readiness.
* @buf: Buffer used for i2c writes, with i2c address prepended to content.
*
* Private driver struct used by kernel threads and interrupt context.
*/
struct tpm_i2c_cr50_priv_data {
int irq;
struct completion tpm_ready;
u8 buf[TPM_CR50_MAX_BUFSIZE];
};
/**
* tpm_cr50_i2c_int_handler() - cr50 interrupt handler.
* @dummy: Unused parameter.
* @tpm_info: TPM chip information.
*
* The cr50 interrupt handler signals waiting threads that the
* interrupt has been asserted. It does not do any interrupt triggered
* processing but is instead used to avoid fixed delays.
*
* Return:
* IRQ_HANDLED signifies irq was handled by this device.
*/
static irqreturn_t tpm_cr50_i2c_int_handler(int dummy, void *tpm_info)
{
struct tpm_chip *chip = tpm_info;
struct tpm_i2c_cr50_priv_data *priv = dev_get_drvdata(&chip->dev);
complete(&priv->tpm_ready);
return IRQ_HANDLED;
}
/**
* tpm_cr50_i2c_wait_tpm_ready() - Wait for tpm to signal ready.
* @chip: A TPM chip.
*
* Wait for completion interrupt if available, otherwise use a fixed
* delay for the TPM to be ready.
*
* Return:
* - 0: Success.
* - -errno: A POSIX error code.
*/
static int tpm_cr50_i2c_wait_tpm_ready(struct tpm_chip *chip)
{
struct tpm_i2c_cr50_priv_data *priv = dev_get_drvdata(&chip->dev);
/* Use a safe fixed delay if interrupt is not supported */
if (priv->irq <= 0) {
msleep(TPM_CR50_TIMEOUT_NOIRQ_MS);
return 0;
}
/* Wait for interrupt to indicate TPM is ready to respond */
if (!wait_for_completion_timeout(&priv->tpm_ready, chip->timeout_a)) {
dev_warn(&chip->dev, "Timeout waiting for TPM ready\n");
return -ETIMEDOUT;
}
return 0;
}
/**
* tpm_cr50_i2c_enable_tpm_irq() - Enable TPM irq.
* @chip: A TPM chip.
*/
static void tpm_cr50_i2c_enable_tpm_irq(struct tpm_chip *chip)
{
struct tpm_i2c_cr50_priv_data *priv = dev_get_drvdata(&chip->dev);
if (priv->irq > 0) {
reinit_completion(&priv->tpm_ready);
enable_irq(priv->irq);
}
}
/**
* tpm_cr50_i2c_disable_tpm_irq() - Disable TPM irq.
* @chip: A TPM chip.
*/
static void tpm_cr50_i2c_disable_tpm_irq(struct tpm_chip *chip)
{
struct tpm_i2c_cr50_priv_data *priv = dev_get_drvdata(&chip->dev);
if (priv->irq > 0)
disable_irq(priv->irq);
}
/**
* tpm_cr50_i2c_transfer_message() - Transfer a message over i2c.
* @dev: Device information.
* @adapter: I2C adapter.
* @msg: Message to transfer.
*
* Call unlocked i2c transfer routine with the provided parameters and
* retry in case of bus errors.
*
* Return:
* - 0: Success.
* - -errno: A POSIX error code.
*/
static int tpm_cr50_i2c_transfer_message(struct device *dev,
struct i2c_adapter *adapter,
struct i2c_msg *msg)
{
unsigned int try;
int rc;
for (try = 0; try < TPM_CR50_I2C_MAX_RETRIES; try++) {
rc = __i2c_transfer(adapter, msg, 1);
if (rc == 1)
return 0; /* Successfully transferred the message */
if (try)
dev_warn(dev, "i2c transfer failed (attempt %d/%d): %d\n",
try + 1, TPM_CR50_I2C_MAX_RETRIES, rc);
usleep_range(TPM_CR50_I2C_RETRY_DELAY_LO, TPM_CR50_I2C_RETRY_DELAY_HI);
}
/* No i2c message transferred */
return -EIO;
}
/**
* tpm_cr50_i2c_read() - Read from TPM register.
* @chip: A TPM chip.
* @addr: Register address to read from.
* @buffer: Read destination, provided by caller.
* @len: Number of bytes to read.
*
* Sends the register address byte to the TPM, then waits until TPM
* is ready via interrupt signal or timeout expiration, then 'len'
* bytes are read from TPM response into the provided 'buffer'.
*
* Return:
* - 0: Success.
* - -errno: A POSIX error code.
*/
static int tpm_cr50_i2c_read(struct tpm_chip *chip, u8 addr, u8 *buffer, size_t len)
{
struct i2c_client *client = to_i2c_client(chip->dev.parent);
struct i2c_msg msg_reg_addr = {
.addr = client->addr,
.len = 1,
.buf = &addr
};
struct i2c_msg msg_response = {
.addr = client->addr,
.flags = I2C_M_RD,
.len = len,
.buf = buffer
};
int rc;
i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
/* Prepare for completion interrupt */
tpm_cr50_i2c_enable_tpm_irq(chip);
/* Send the register address byte to the TPM */
rc = tpm_cr50_i2c_transfer_message(&chip->dev, client->adapter, &msg_reg_addr);
if (rc < 0)
goto out;
/* Wait for TPM to be ready with response data */
rc = tpm_cr50_i2c_wait_tpm_ready(chip);
if (rc < 0)
goto out;
/* Read response data from the TPM */
rc = tpm_cr50_i2c_transfer_message(&chip->dev, client->adapter, &msg_response);
out:
tpm_cr50_i2c_disable_tpm_irq(chip);
i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
if (rc < 0)
return rc;
return 0;
}
/**
* tpm_cr50_i2c_write()- Write to TPM register.
* @chip: A TPM chip.
* @addr: Register address to write to.
* @buffer: Data to write.
* @len: Number of bytes to write.
*
* The provided address is prepended to the data in 'buffer', the
* cobined address+data is sent to the TPM, then wait for TPM to
* indicate it is done writing.
*
* Return:
* - 0: Success.
* - -errno: A POSIX error code.
*/
static int tpm_cr50_i2c_write(struct tpm_chip *chip, u8 addr, u8 *buffer,
size_t len)
{
struct tpm_i2c_cr50_priv_data *priv = dev_get_drvdata(&chip->dev);
struct i2c_client *client = to_i2c_client(chip->dev.parent);
struct i2c_msg msg = {
.addr = client->addr,
.len = len + 1,
.buf = priv->buf
};
int rc;
if (len > TPM_CR50_MAX_BUFSIZE - 1)
return -EINVAL;
/* Prepend the 'register address' to the buffer */
priv->buf[0] = addr;
memcpy(priv->buf + 1, buffer, len);
i2c_lock_bus(client->adapter, I2C_LOCK_SEGMENT);
/* Prepare for completion interrupt */
tpm_cr50_i2c_enable_tpm_irq(chip);
/* Send write request buffer with address */
rc = tpm_cr50_i2c_transfer_message(&chip->dev, client->adapter, &msg);
if (rc < 0)
goto out;
/* Wait for TPM to be ready, ignore timeout */
tpm_cr50_i2c_wait_tpm_ready(chip);
out:
tpm_cr50_i2c_disable_tpm_irq(chip);
i2c_unlock_bus(client->adapter, I2C_LOCK_SEGMENT);
if (rc < 0)
return rc;
return 0;
}
/**
* tpm_cr50_check_locality() - Verify TPM locality 0 is active.
* @chip: A TPM chip.
*
* Return:
* - 0: Success.
* - -errno: A POSIX error code.
*/
static int tpm_cr50_check_locality(struct tpm_chip *chip)
{
u8 mask = TPM_ACCESS_VALID | TPM_ACCESS_ACTIVE_LOCALITY;
u8 buf;
int rc;
rc = tpm_cr50_i2c_read(chip, TPM_I2C_ACCESS(0), &buf, sizeof(buf));
if (rc < 0)
return rc;
if ((buf & mask) == mask)
return 0;
return -EIO;
}
/**
* tpm_cr50_release_locality() - Release TPM locality.
* @chip: A TPM chip.
* @force: Flag to force release if set.
*/
static void tpm_cr50_release_locality(struct tpm_chip *chip, bool force)
{
u8 mask = TPM_ACCESS_VALID | TPM_ACCESS_REQUEST_PENDING;
u8 addr = TPM_I2C_ACCESS(0);
u8 buf;
if (tpm_cr50_i2c_read(chip, addr, &buf, sizeof(buf)) < 0)
return;
if (force || (buf & mask) == mask) {
buf = TPM_ACCESS_ACTIVE_LOCALITY;
tpm_cr50_i2c_write(chip, addr, &buf, sizeof(buf));
}
}
/**
* tpm_cr50_request_locality() - Request TPM locality 0.
* @chip: A TPM chip.
*
* Return:
* - 0: Success.
* - -errno: A POSIX error code.
*/
static int tpm_cr50_request_locality(struct tpm_chip *chip)
{
u8 buf = TPM_ACCESS_REQUEST_USE;
unsigned long stop;
int rc;
if (!tpm_cr50_check_locality(chip))
return 0;
rc = tpm_cr50_i2c_write(chip, TPM_I2C_ACCESS(0), &buf, sizeof(buf));
if (rc < 0)
return rc;
stop = jiffies + chip->timeout_a;
do {
if (!tpm_cr50_check_locality(chip))
return 0;
msleep(TPM_CR50_TIMEOUT_SHORT_MS);
} while (time_before(jiffies, stop));
return -ETIMEDOUT;
}
/**
* tpm_cr50_i2c_tis_status() - Read cr50 tis status.
* @chip: A TPM chip.
*
* cr50 requires all 4 bytes of status register to be read.
*
* Return:
* TPM status byte.
*/
static u8 tpm_cr50_i2c_tis_status(struct tpm_chip *chip)
{
u8 buf[4];
if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(0), buf, sizeof(buf)) < 0)
return 0;
return buf[0];
}
/**
* tpm_cr50_i2c_tis_set_ready() - Set status register to ready.
* @chip: A TPM chip.
*
* cr50 requires all 4 bytes of status register to be written.
*/
static void tpm_cr50_i2c_tis_set_ready(struct tpm_chip *chip)
{
u8 buf[4] = { TPM_STS_COMMAND_READY };
tpm_cr50_i2c_write(chip, TPM_I2C_STS(0), buf, sizeof(buf));
msleep(TPM_CR50_TIMEOUT_SHORT_MS);
}
/**
* tpm_cr50_i2c_get_burst_and_status() - Get burst count and status.
* @chip: A TPM chip.
* @mask: Status mask.
* @burst: Return value for burst.
* @status: Return value for status.
*
* cr50 uses bytes 3:2 of status register for burst count and
* all 4 bytes must be read.
*
* Return:
* - 0: Success.
* - -errno: A POSIX error code.
*/
static int tpm_cr50_i2c_get_burst_and_status(struct tpm_chip *chip, u8 mask,
size_t *burst, u32 *status)
{
unsigned long stop;
u8 buf[4];
*status = 0;
/* wait for burstcount */
stop = jiffies + chip->timeout_b;
do {
if (tpm_cr50_i2c_read(chip, TPM_I2C_STS(0), buf, sizeof(buf)) < 0) {
msleep(TPM_CR50_TIMEOUT_SHORT_MS);
continue;
}
*status = *buf;
*burst = le16_to_cpup((__le16 *)(buf + 1));
if ((*status & mask) == mask &&
*burst > 0 && *burst <= TPM_CR50_MAX_BUFSIZE - 1)
return 0;
msleep(TPM_CR50_TIMEOUT_SHORT_MS);
} while (time_before(jiffies, stop));
dev_err(&chip->dev, "Timeout reading burst and status\n");
return -ETIMEDOUT;
}
/**
* tpm_cr50_i2c_tis_recv() - TPM reception callback.
* @chip: A TPM chip.
* @buf: Reception buffer.
* @buf_len: Buffer length to read.
*
* Return:
* - >= 0: Number of read bytes.
* - -errno: A POSIX error code.
*/
static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len)
{
u8 mask = TPM_STS_VALID | TPM_STS_DATA_AVAIL;
size_t burstcnt, cur, len, expected;
u8 addr = TPM_I2C_DATA_FIFO(0);
u32 status;
int rc;
if (buf_len < TPM_HEADER_SIZE)
return -EINVAL;
rc = tpm_cr50_i2c_get_burst_and_status(chip, mask, &burstcnt, &status);
if (rc < 0)
goto out_err;
if (burstcnt > buf_len || burstcnt < TPM_HEADER_SIZE) {
dev_err(&chip->dev,
"Unexpected burstcnt: %zu (max=%zu, min=%d)\n",
burstcnt, buf_len, TPM_HEADER_SIZE);
rc = -EIO;
goto out_err;
}
/* Read first chunk of burstcnt bytes */
rc = tpm_cr50_i2c_read(chip, addr, buf, burstcnt);
if (rc < 0) {
dev_err(&chip->dev, "Read of first chunk failed\n");
goto out_err;
}
/* Determine expected data in the return buffer */
expected = be32_to_cpup((__be32 *)(buf + 2));
if (expected > buf_len) {
dev_err(&chip->dev, "Buffer too small to receive i2c data\n");
rc = -E2BIG;
goto out_err;
}
/* Now read the rest of the data */
cur = burstcnt;
while (cur < expected) {
/* Read updated burst count and check status */
rc = tpm_cr50_i2c_get_burst_and_status(chip, mask, &burstcnt, &status);
if (rc < 0)
goto out_err;
len = min_t(size_t, burstcnt, expected - cur);
rc = tpm_cr50_i2c_read(chip, addr, buf + cur, len);
if (rc < 0) {
dev_err(&chip->dev, "Read failed\n");
goto out_err;
}
cur += len;
}
/* Ensure TPM is done reading data */
rc = tpm_cr50_i2c_get_burst_and_status(chip, TPM_STS_VALID, &burstcnt, &status);
if (rc < 0)
goto out_err;
if (status & TPM_STS_DATA_AVAIL) {
dev_err(&chip->dev, "Data still available\n");
rc = -EIO;
goto out_err;
}
tpm_cr50_release_locality(chip, false);
return cur;
out_err:
/* Abort current transaction if still pending */
if (tpm_cr50_i2c_tis_status(chip) & TPM_STS_COMMAND_READY)
tpm_cr50_i2c_tis_set_ready(chip);
tpm_cr50_release_locality(chip, false);
return rc;
}
/**
* tpm_cr50_i2c_tis_send() - TPM transmission callback.
* @chip: A TPM chip.
* @buf: Buffer to send.
* @len: Buffer length.
*
* Return:
* - 0: Success.
* - -errno: A POSIX error code.
*/
static int tpm_cr50_i2c_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
{
size_t burstcnt, limit, sent = 0;
u8 tpm_go[4] = { TPM_STS_GO };
unsigned long stop;
u32 status;
int rc;
rc = tpm_cr50_request_locality(chip);
if (rc < 0)
return rc;
/* Wait until TPM is ready for a command */
stop = jiffies + chip->timeout_b;
while (!(tpm_cr50_i2c_tis_status(chip) & TPM_STS_COMMAND_READY)) {
if (time_after(jiffies, stop)) {
rc = -ETIMEDOUT;
goto out_err;
}
tpm_cr50_i2c_tis_set_ready(chip);
}
while (len > 0) {
u8 mask = TPM_STS_VALID;
/* Wait for data if this is not the first chunk */
if (sent > 0)
mask |= TPM_STS_DATA_EXPECT;
/* Read burst count and check status */
rc = tpm_cr50_i2c_get_burst_and_status(chip, mask, &burstcnt, &status);
if (rc < 0)
goto out_err;
/*
* Use burstcnt - 1 to account for the address byte
* that is inserted by tpm_cr50_i2c_write()
*/
limit = min_t(size_t, burstcnt - 1, len);
rc = tpm_cr50_i2c_write(chip, TPM_I2C_DATA_FIFO(0), &buf[sent], limit);
if (rc < 0) {
dev_err(&chip->dev, "Write failed\n");
goto out_err;
}
sent += limit;
len -= limit;
}
/* Ensure TPM is not expecting more data */
rc = tpm_cr50_i2c_get_burst_and_status(chip, TPM_STS_VALID, &burstcnt, &status);
if (rc < 0)
goto out_err;
if (status & TPM_STS_DATA_EXPECT) {
dev_err(&chip->dev, "Data still expected\n");
rc = -EIO;
goto out_err;
}
/* Start the TPM command */
rc = tpm_cr50_i2c_write(chip, TPM_I2C_STS(0), tpm_go,
sizeof(tpm_go));
if (rc < 0) {
dev_err(&chip->dev, "Start command failed\n");
goto out_err;
}
return 0;
out_err:
/* Abort current transaction if still pending */
if (tpm_cr50_i2c_tis_status(chip) & TPM_STS_COMMAND_READY)
tpm_cr50_i2c_tis_set_ready(chip);
tpm_cr50_release_locality(chip, false);
return rc;
}
/**
* tpm_cr50_i2c_req_canceled() - Callback to notify a request cancel.
* @chip: A TPM chip.
* @status: Status given by the cancel callback.
*
* Return:
* True if command is ready, False otherwise.
*/
static bool tpm_cr50_i2c_req_canceled(struct tpm_chip *chip, u8 status)
{
return status == TPM_STS_COMMAND_READY;
}
static bool tpm_cr50_i2c_is_firmware_power_managed(struct device *dev)
{
u8 val;
int ret;
/* This flag should default true when the device property is not present */
ret = device_property_read_u8(dev, "firmware-power-managed", &val);
if (ret)
return true;
return val;
}
static const struct tpm_class_ops cr50_i2c = {
.flags = TPM_OPS_AUTO_STARTUP,
.status = &tpm_cr50_i2c_tis_status,
.recv = &tpm_cr50_i2c_tis_recv,
.send = &tpm_cr50_i2c_tis_send,
.cancel = &tpm_cr50_i2c_tis_set_ready,
.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
.req_canceled = &tpm_cr50_i2c_req_canceled,
};
#ifdef CONFIG_ACPI
static const struct acpi_device_id cr50_i2c_acpi_id[] = {
{ "GOOG0005", 0 },
{}
};
MODULE_DEVICE_TABLE(acpi, cr50_i2c_acpi_id);
#endif
#ifdef CONFIG_OF
static const struct of_device_id of_cr50_i2c_match[] = {
{ .compatible = "google,cr50", },
{}
};
MODULE_DEVICE_TABLE(of, of_cr50_i2c_match);
#endif
/**
* tpm_cr50_i2c_probe() - Driver probe function.
* @client: I2C client information.
* @id: I2C device id.
*
* Return:
* - 0: Success.
* - -errno: A POSIX error code.
*/
static int tpm_cr50_i2c_probe(struct i2c_client *client)
{
struct tpm_i2c_cr50_priv_data *priv;
struct device *dev = &client->dev;
struct tpm_chip *chip;
u32 vendor;
u8 buf[4];
int rc;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
chip = tpmm_chip_alloc(dev, &cr50_i2c);
if (IS_ERR(chip))
return PTR_ERR(chip);
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/* cr50 is a TPM 2.0 chip */
chip->flags |= TPM_CHIP_FLAG_TPM2;
if (tpm_cr50_i2c_is_firmware_power_managed(dev))
chip->flags |= TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED;
/* Default timeouts */
chip->timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
chip->timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
chip->timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
chip->timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
dev_set_drvdata(&chip->dev, priv);
init_completion(&priv->tpm_ready);
if (client->irq > 0) {
rc = devm_request_irq(dev, client->irq, tpm_cr50_i2c_int_handler,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
IRQF_NO_AUTOEN,
dev->driver->name, chip);
if (rc < 0) {
dev_err(dev, "Failed to probe IRQ %d\n", client->irq);
return rc;
}
priv->irq = client->irq;
} else {
dev_warn(dev, "No IRQ, will use %ums delay for TPM ready\n",
TPM_CR50_TIMEOUT_NOIRQ_MS);
}
rc = tpm_cr50_request_locality(chip);
if (rc < 0) {
dev_err(dev, "Could not request locality\n");
return rc;
}
/* Read four bytes from DID_VID register */
rc = tpm_cr50_i2c_read(chip, TPM_I2C_DID_VID(0), buf, sizeof(buf));
if (rc < 0) {
dev_err(dev, "Could not read vendor id\n");
tpm_cr50_release_locality(chip, true);
return rc;
}
vendor = le32_to_cpup((__le32 *)buf);
if (vendor != TPM_CR50_I2C_DID_VID && vendor != TPM_TI50_I2C_DID_VID) {
dev_err(dev, "Vendor ID did not match! ID was %08x\n", vendor);
tpm_cr50_release_locality(chip, true);
return -ENODEV;
}
dev_info(dev, "%s TPM 2.0 (i2c 0x%02x irq %d id 0x%x)\n",
vendor == TPM_TI50_I2C_DID_VID ? "ti50" : "cr50",
client->addr, client->irq, vendor >> 16);
return tpm_chip_register(chip);
}
/**
* tpm_cr50_i2c_remove() - Driver remove function.
* @client: I2C client information.
*
* Return:
* - 0: Success.
* - -errno: A POSIX error code.
*/
i2c: Make remove callback return void The value returned by an i2c driver's remove function is mostly ignored. (Only an error message is printed if the value is non-zero that the error is ignored.) So change the prototype of the remove function to return no value. This way driver authors are not tempted to assume that passing an error to the upper layer is a good idea. All drivers are adapted accordingly. There is no intended change of behaviour, all callbacks were prepared to return 0 before. Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com> Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au> Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Crt Mori <cmo@melexis.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013 Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/* Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5 Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860 Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power Acked-by: Krzysztof Hałasa <khalasa@piap.pl> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-15 16:02:30 +08:00
static void tpm_cr50_i2c_remove(struct i2c_client *client)
{
struct tpm_chip *chip = i2c_get_clientdata(client);
struct device *dev = &client->dev;
if (!chip) {
dev_crit(dev, "Could not get client data at remove, memory corruption ahead\n");
i2c: Make remove callback return void The value returned by an i2c driver's remove function is mostly ignored. (Only an error message is printed if the value is non-zero that the error is ignored.) So change the prototype of the remove function to return no value. This way driver authors are not tempted to assume that passing an error to the upper layer is a good idea. All drivers are adapted accordingly. There is no intended change of behaviour, all callbacks were prepared to return 0 before. Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com> Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au> Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Crt Mori <cmo@melexis.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013 Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/* Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5 Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860 Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power Acked-by: Krzysztof Hałasa <khalasa@piap.pl> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-15 16:02:30 +08:00
return;
}
tpm_chip_unregister(chip);
tpm_cr50_release_locality(chip, true);
}
static SIMPLE_DEV_PM_OPS(cr50_i2c_pm, tpm_pm_suspend, tpm_pm_resume);
static struct i2c_driver cr50_i2c_driver = {
.probe = tpm_cr50_i2c_probe,
.remove = tpm_cr50_i2c_remove,
.driver = {
.name = "cr50_i2c",
.pm = &cr50_i2c_pm,
.acpi_match_table = ACPI_PTR(cr50_i2c_acpi_id),
.of_match_table = of_match_ptr(of_cr50_i2c_match),
},
};
module_i2c_driver(cr50_i2c_driver);
MODULE_DESCRIPTION("cr50 TPM I2C Driver");
MODULE_LICENSE("GPL");