linux/drivers/char/tpm/st33zp24/i2c.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
 * Copyright (C) 2009 - 2016 STMicroelectronics
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/acpi.h>
#include <linux/tpm.h>

#include "../tpm.h"
#include "st33zp24.h"

#define TPM_DUMMY_BYTE

struct st33zp24_i2c_phy {};

/*
 * write8_reg
 * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
 * @param: tpm_register, the tpm tis register where the data should be written
 * @param: tpm_data, the tpm_data to write inside the tpm_register
 * @param: tpm_size, The length of the data
 * @return: Returns negative errno, or else the number of bytes written.
 */
static int write8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size)
{} /* write8_reg() */

/*
 * read8_reg
 * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
 * @param: tpm_register, the tpm tis register where the data should be read
 * @param: tpm_data, the TPM response
 * @param: tpm_size, tpm TPM response size to read.
 * @return: number of byte read successfully: should be one if success.
 */
static int read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size)
{} /* read8_reg() */

/*
 * st33zp24_i2c_send
 * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
 * @param: phy_id, the phy description
 * @param: tpm_register, the tpm tis register where the data should be written
 * @param: tpm_data, the tpm_data to write inside the tpm_register
 * @param: tpm_size, the length of the data
 * @return: number of byte written successfully: should be one if success.
 */
static int st33zp24_i2c_send(void *phy_id, u8 tpm_register, u8 *tpm_data,
			     int tpm_size)
{}

/*
 * st33zp24_i2c_recv
 * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
 * @param: phy_id, the phy description
 * @param: tpm_register, the tpm tis register where the data should be read
 * @param: tpm_data, the TPM response
 * @param: tpm_size, tpm TPM response size to read.
 * @return: number of byte read successfully: should be one if success.
 */
static int st33zp24_i2c_recv(void *phy_id, u8 tpm_register, u8 *tpm_data,
			     int tpm_size)
{}

static const struct st33zp24_phy_ops i2c_phy_ops =;

/*
 * st33zp24_i2c_probe initialize the TPM device
 * @param: client, the i2c_client description (TPM I2C description).
 * @param: id, the i2c_device_id struct.
 * @return: 0 in case of success.
 *	 -1 in other case.
 */
static int st33zp24_i2c_probe(struct i2c_client *client)
{}

/*
 * st33zp24_i2c_remove remove the TPM device
 * @param: client, the i2c_client description (TPM I2C description).
 * @return: 0 in case of success.
 */
static void st33zp24_i2c_remove(struct i2c_client *client)
{}

static const struct i2c_device_id st33zp24_i2c_id[] =;
MODULE_DEVICE_TABLE(i2c, st33zp24_i2c_id);

static const struct of_device_id of_st33zp24_i2c_match[] __maybe_unused =;
MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);

static const struct acpi_device_id st33zp24_i2c_acpi_match[] __maybe_unused =;
MODULE_DEVICE_TABLE(acpi, st33zp24_i2c_acpi_match);

static SIMPLE_DEV_PM_OPS(st33zp24_i2c_ops, st33zp24_pm_suspend,
			 st33zp24_pm_resume);

static struct i2c_driver st33zp24_i2c_driver =;

module_i2c_driver();

MODULE_AUTHOR();
MODULE_DESCRIPTION();
MODULE_VERSION();
MODULE_LICENSE();