1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
4  * Copyright (C) 2009 - 2016 STMicroelectronics
8 #include <linux/i2c.h>
25  * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
33 	struct st33zp24_i2c_phy *phy = phy_id;  in write8_reg()  local
35 	phy->buf[0] = tpm_register;  in write8_reg()
36 	memcpy(phy->buf + 1, tpm_data, tpm_size);  in write8_reg()
37 	return i2c_master_send(phy->client, phy->buf, tpm_size + 1);  in write8_reg()
42  * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
50 	struct st33zp24_i2c_phy *phy = phy_id;  in read8_reg()  local
55 	status = write8_reg(phy, tpm_register, &data, 1);  in read8_reg()
57 		status = i2c_master_recv(phy->client, tpm_data, tpm_size);  in read8_reg()
63  * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
64  * @param: phy_id, the phy description
79  * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
80  * @param: phy_id, the phy description
99  * @param: client, the i2c_client description (TPM I2C description).
102  *	 -1 in other case.
106 	struct st33zp24_i2c_phy *phy;  in st33zp24_i2c_probe()  local
108 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {  in st33zp24_i2c_probe()
109 		dev_info(&client->dev, "client not i2c capable\n");  in st33zp24_i2c_probe()
110 		return -ENODEV;  in st33zp24_i2c_probe()
113 	phy = devm_kzalloc(&client->dev, sizeof(struct st33zp24_i2c_phy),  in st33zp24_i2c_probe()
115 	if (!phy)  in st33zp24_i2c_probe()
116 		return -ENOMEM;  in st33zp24_i2c_probe()
118 	phy->client = client;  in st33zp24_i2c_probe()
120 	return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq);  in st33zp24_i2c_probe()
125  * @param: client, the i2c_client description (TPM I2C description).
139 MODULE_DEVICE_TABLE(i2c, st33zp24_i2c_id);
142 	{ .compatible = "st,st33zp24-i2c", },
171 MODULE_DESCRIPTION("STM TPM 1.2 I2C ST33 Driver");