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317 lines
8.4 KiB
317 lines
8.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24 |
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* Copyright (C) 2009 - 2016 STMicroelectronics |
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*/ |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/gpio.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/of_irq.h> |
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#include <linux/of_gpio.h> |
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#include <linux/acpi.h> |
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#include <linux/tpm.h> |
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#include <linux/platform_data/st33zp24.h> |
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#include "../tpm.h" |
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#include "st33zp24.h" |
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#define TPM_DUMMY_BYTE 0xAA |
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struct st33zp24_i2c_phy { |
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struct i2c_client *client; |
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u8 buf[ST33ZP24_BUFSIZE + 1]; |
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int io_lpcpd; |
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}; |
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/* |
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* write8_reg |
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* Send byte to the TIS register according to the ST33ZP24 I2C protocol. |
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* @param: tpm_register, the tpm tis register where the data should be written |
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* @param: tpm_data, the tpm_data to write inside the tpm_register |
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* @param: tpm_size, The length of the data |
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* @return: Returns negative errno, or else the number of bytes written. |
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*/ |
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static int write8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size) |
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{ |
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struct st33zp24_i2c_phy *phy = phy_id; |
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phy->buf[0] = tpm_register; |
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memcpy(phy->buf + 1, tpm_data, tpm_size); |
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return i2c_master_send(phy->client, phy->buf, tpm_size + 1); |
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} /* write8_reg() */ |
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/* |
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* read8_reg |
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* Recv byte from the TIS register according to the ST33ZP24 I2C protocol. |
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* @param: tpm_register, the tpm tis register where the data should be read |
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* @param: tpm_data, the TPM response |
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* @param: tpm_size, tpm TPM response size to read. |
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* @return: number of byte read successfully: should be one if success. |
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*/ |
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static int read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size) |
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{ |
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struct st33zp24_i2c_phy *phy = phy_id; |
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u8 status = 0; |
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u8 data; |
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data = TPM_DUMMY_BYTE; |
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status = write8_reg(phy, tpm_register, &data, 1); |
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if (status == 2) |
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status = i2c_master_recv(phy->client, tpm_data, tpm_size); |
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return status; |
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} /* read8_reg() */ |
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/* |
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* st33zp24_i2c_send |
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* Send byte to the TIS register according to the ST33ZP24 I2C protocol. |
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* @param: phy_id, the phy description |
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* @param: tpm_register, the tpm tis register where the data should be written |
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* @param: tpm_data, the tpm_data to write inside the tpm_register |
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* @param: tpm_size, the length of the data |
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* @return: number of byte written successfully: should be one if success. |
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*/ |
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static int st33zp24_i2c_send(void *phy_id, u8 tpm_register, u8 *tpm_data, |
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int tpm_size) |
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{ |
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return write8_reg(phy_id, tpm_register | TPM_WRITE_DIRECTION, tpm_data, |
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tpm_size); |
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} |
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/* |
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* st33zp24_i2c_recv |
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* Recv byte from the TIS register according to the ST33ZP24 I2C protocol. |
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* @param: phy_id, the phy description |
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* @param: tpm_register, the tpm tis register where the data should be read |
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* @param: tpm_data, the TPM response |
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* @param: tpm_size, tpm TPM response size to read. |
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* @return: number of byte read successfully: should be one if success. |
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*/ |
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static int st33zp24_i2c_recv(void *phy_id, u8 tpm_register, u8 *tpm_data, |
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int tpm_size) |
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{ |
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return read8_reg(phy_id, tpm_register, tpm_data, tpm_size); |
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} |
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static const struct st33zp24_phy_ops i2c_phy_ops = { |
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.send = st33zp24_i2c_send, |
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.recv = st33zp24_i2c_recv, |
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}; |
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static const struct acpi_gpio_params lpcpd_gpios = { 1, 0, false }; |
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static const struct acpi_gpio_mapping acpi_st33zp24_gpios[] = { |
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{ "lpcpd-gpios", &lpcpd_gpios, 1 }, |
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{}, |
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}; |
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static int st33zp24_i2c_acpi_request_resources(struct i2c_client *client) |
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{ |
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struct tpm_chip *chip = i2c_get_clientdata(client); |
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struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev); |
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struct st33zp24_i2c_phy *phy = tpm_dev->phy_id; |
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struct gpio_desc *gpiod_lpcpd; |
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struct device *dev = &client->dev; |
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int ret; |
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ret = devm_acpi_dev_add_driver_gpios(dev, acpi_st33zp24_gpios); |
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if (ret) |
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return ret; |
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/* Get LPCPD GPIO from ACPI */ |
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gpiod_lpcpd = devm_gpiod_get(dev, "lpcpd", GPIOD_OUT_HIGH); |
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if (IS_ERR(gpiod_lpcpd)) { |
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dev_err(&client->dev, |
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"Failed to retrieve lpcpd-gpios from acpi.\n"); |
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phy->io_lpcpd = -1; |
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/* |
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* lpcpd pin is not specified. This is not an issue as |
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* power management can be also managed by TPM specific |
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* commands. So leave with a success status code. |
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*/ |
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return 0; |
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} |
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phy->io_lpcpd = desc_to_gpio(gpiod_lpcpd); |
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return 0; |
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} |
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static int st33zp24_i2c_of_request_resources(struct i2c_client *client) |
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{ |
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struct tpm_chip *chip = i2c_get_clientdata(client); |
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struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev); |
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struct st33zp24_i2c_phy *phy = tpm_dev->phy_id; |
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struct device_node *pp; |
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int gpio; |
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int ret; |
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pp = client->dev.of_node; |
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if (!pp) { |
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dev_err(&client->dev, "No platform data\n"); |
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return -ENODEV; |
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} |
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/* Get GPIO from device tree */ |
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gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0); |
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if (gpio < 0) { |
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dev_err(&client->dev, |
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"Failed to retrieve lpcpd-gpios from dts.\n"); |
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phy->io_lpcpd = -1; |
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/* |
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* lpcpd pin is not specified. This is not an issue as |
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* power management can be also managed by TPM specific |
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* commands. So leave with a success status code. |
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*/ |
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return 0; |
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} |
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/* GPIO request and configuration */ |
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ret = devm_gpio_request_one(&client->dev, gpio, |
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GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD"); |
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if (ret) { |
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dev_err(&client->dev, "Failed to request lpcpd pin\n"); |
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return -ENODEV; |
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} |
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phy->io_lpcpd = gpio; |
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return 0; |
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} |
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static int st33zp24_i2c_request_resources(struct i2c_client *client) |
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{ |
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struct tpm_chip *chip = i2c_get_clientdata(client); |
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struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev); |
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struct st33zp24_i2c_phy *phy = tpm_dev->phy_id; |
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struct st33zp24_platform_data *pdata; |
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int ret; |
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pdata = client->dev.platform_data; |
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if (!pdata) { |
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dev_err(&client->dev, "No platform data\n"); |
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return -ENODEV; |
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} |
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/* store for late use */ |
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phy->io_lpcpd = pdata->io_lpcpd; |
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if (gpio_is_valid(pdata->io_lpcpd)) { |
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ret = devm_gpio_request_one(&client->dev, |
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pdata->io_lpcpd, GPIOF_OUT_INIT_HIGH, |
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"TPM IO_LPCPD"); |
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if (ret) { |
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dev_err(&client->dev, "Failed to request lpcpd pin\n"); |
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return ret; |
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} |
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} |
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return 0; |
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} |
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/* |
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* st33zp24_i2c_probe initialize the TPM device |
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* @param: client, the i2c_client description (TPM I2C description). |
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* @param: id, the i2c_device_id struct. |
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* @return: 0 in case of success. |
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* -1 in other case. |
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*/ |
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static int st33zp24_i2c_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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int ret; |
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struct st33zp24_platform_data *pdata; |
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struct st33zp24_i2c_phy *phy; |
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if (!client) { |
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pr_info("%s: i2c client is NULL. Device not accessible.\n", |
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__func__); |
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return -ENODEV; |
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} |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
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dev_info(&client->dev, "client not i2c capable\n"); |
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return -ENODEV; |
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} |
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phy = devm_kzalloc(&client->dev, sizeof(struct st33zp24_i2c_phy), |
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GFP_KERNEL); |
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if (!phy) |
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return -ENOMEM; |
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phy->client = client; |
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pdata = client->dev.platform_data; |
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if (!pdata && client->dev.of_node) { |
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ret = st33zp24_i2c_of_request_resources(client); |
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if (ret) |
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return ret; |
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} else if (pdata) { |
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ret = st33zp24_i2c_request_resources(client); |
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if (ret) |
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return ret; |
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} else if (ACPI_HANDLE(&client->dev)) { |
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ret = st33zp24_i2c_acpi_request_resources(client); |
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if (ret) |
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return ret; |
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} |
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return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq, |
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phy->io_lpcpd); |
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} |
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/* |
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* st33zp24_i2c_remove remove the TPM device |
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* @param: client, the i2c_client description (TPM I2C description). |
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* @return: 0 in case of success. |
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*/ |
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static int st33zp24_i2c_remove(struct i2c_client *client) |
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{ |
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struct tpm_chip *chip = i2c_get_clientdata(client); |
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int ret; |
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ret = st33zp24_remove(chip); |
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if (ret) |
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return ret; |
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return 0; |
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} |
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static const struct i2c_device_id st33zp24_i2c_id[] = { |
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{TPM_ST33_I2C, 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, st33zp24_i2c_id); |
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static const struct of_device_id of_st33zp24_i2c_match[] = { |
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{ .compatible = "st,st33zp24-i2c", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match); |
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static const struct acpi_device_id st33zp24_i2c_acpi_match[] = { |
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{"SMO3324"}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(acpi, st33zp24_i2c_acpi_match); |
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static SIMPLE_DEV_PM_OPS(st33zp24_i2c_ops, st33zp24_pm_suspend, |
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st33zp24_pm_resume); |
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static struct i2c_driver st33zp24_i2c_driver = { |
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.driver = { |
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.name = TPM_ST33_I2C, |
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.pm = &st33zp24_i2c_ops, |
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.of_match_table = of_match_ptr(of_st33zp24_i2c_match), |
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.acpi_match_table = ACPI_PTR(st33zp24_i2c_acpi_match), |
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}, |
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.probe = st33zp24_i2c_probe, |
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.remove = st33zp24_i2c_remove, |
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.id_table = st33zp24_i2c_id |
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}; |
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module_i2c_driver(st33zp24_i2c_driver); |
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MODULE_AUTHOR("TPM support ([email protected])"); |
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MODULE_DESCRIPTION("STM TPM 1.2 I2C ST33 Driver"); |
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MODULE_VERSION("1.3.0"); |
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MODULE_LICENSE("GPL");
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