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![Christophe Ricard](/assets/img/avatar_default.png)
Remove useless priv field in struct tpm_vendor_specific and take benefit of chip->dev.driver_data. As priv is the latest field available in struct tpm_vendor_specific, remove any reference to that structure. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
313 lines
8.7 KiB
C
313 lines
8.7 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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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[TPM_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 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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/* Get LPCPD GPIO from ACPI */
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gpiod_lpcpd = devm_gpiod_get_index(dev, "TPM IO LPCPD", 1,
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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 drescription (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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return st33zp24_remove(chip);
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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 (TPMsupport@list.st.com)");
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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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