^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2009 - 2016 STMicroelectronics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/of_irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/of_gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/tpm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/platform_data/st33zp24.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "../tpm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "st33zp24.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define TPM_DUMMY_BYTE 0xAA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct st33zp24_i2c_phy {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) u8 buf[ST33ZP24_BUFSIZE + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int io_lpcpd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * write8_reg
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * @param: tpm_register, the tpm tis register where the data should be written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * @param: tpm_data, the tpm_data to write inside the tpm_register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * @param: tpm_size, The length of the data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * @return: Returns negative errno, or else the number of bytes written.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static int write8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct st33zp24_i2c_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) phy->buf[0] = tpm_register;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) memcpy(phy->buf + 1, tpm_data, tpm_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return i2c_master_send(phy->client, phy->buf, tpm_size + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) } /* write8_reg() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * read8_reg
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * @param: tpm_register, the tpm tis register where the data should be read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * @param: tpm_data, the TPM response
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * @param: tpm_size, tpm TPM response size to read.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * @return: number of byte read successfully: should be one if success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static int read8_reg(void *phy_id, u8 tpm_register, u8 *tpm_data, int tpm_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) struct st33zp24_i2c_phy *phy = phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) u8 status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) u8 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) data = TPM_DUMMY_BYTE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) status = write8_reg(phy, tpm_register, &data, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (status == 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) status = i2c_master_recv(phy->client, tpm_data, tpm_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) } /* read8_reg() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * st33zp24_i2c_send
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * @param: phy_id, the phy description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * @param: tpm_register, the tpm tis register where the data should be written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * @param: tpm_data, the tpm_data to write inside the tpm_register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * @param: tpm_size, the length of the data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * @return: number of byte written successfully: should be one if success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static int st33zp24_i2c_send(void *phy_id, u8 tpm_register, u8 *tpm_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) int tpm_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return write8_reg(phy_id, tpm_register | TPM_WRITE_DIRECTION, tpm_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) tpm_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * st33zp24_i2c_recv
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * @param: phy_id, the phy description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * @param: tpm_register, the tpm tis register where the data should be read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * @param: tpm_data, the TPM response
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * @param: tpm_size, tpm TPM response size to read.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * @return: number of byte read successfully: should be one if success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static int st33zp24_i2c_recv(void *phy_id, u8 tpm_register, u8 *tpm_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int tpm_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return read8_reg(phy_id, tpm_register, tpm_data, tpm_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static const struct st33zp24_phy_ops i2c_phy_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) .send = st33zp24_i2c_send,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) .recv = st33zp24_i2c_recv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static const struct acpi_gpio_params lpcpd_gpios = { 1, 0, false };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static const struct acpi_gpio_mapping acpi_st33zp24_gpios[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) { "lpcpd-gpios", &lpcpd_gpios, 1 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static int st33zp24_i2c_acpi_request_resources(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct tpm_chip *chip = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct st33zp24_i2c_phy *phy = tpm_dev->phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct gpio_desc *gpiod_lpcpd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) ret = devm_acpi_dev_add_driver_gpios(dev, acpi_st33zp24_gpios);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) /* Get LPCPD GPIO from ACPI */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) gpiod_lpcpd = devm_gpiod_get(dev, "lpcpd", GPIOD_OUT_HIGH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (IS_ERR(gpiod_lpcpd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) "Failed to retrieve lpcpd-gpios from acpi.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) phy->io_lpcpd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * lpcpd pin is not specified. This is not an issue as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * power management can be also managed by TPM specific
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * commands. So leave with a success status code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) phy->io_lpcpd = desc_to_gpio(gpiod_lpcpd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static int st33zp24_i2c_of_request_resources(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct tpm_chip *chip = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) struct st33zp24_i2c_phy *phy = tpm_dev->phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct device_node *pp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) int gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) pp = client->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (!pp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) dev_err(&client->dev, "No platform data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) /* Get GPIO from device tree */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (gpio < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) dev_err(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) "Failed to retrieve lpcpd-gpios from dts.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) phy->io_lpcpd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * lpcpd pin is not specified. This is not an issue as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * power management can be also managed by TPM specific
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * commands. So leave with a success status code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) /* GPIO request and configuration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) ret = devm_gpio_request_one(&client->dev, gpio,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) dev_err(&client->dev, "Failed to request lpcpd pin\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) phy->io_lpcpd = gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static int st33zp24_i2c_request_resources(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct tpm_chip *chip = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct st33zp24_dev *tpm_dev = dev_get_drvdata(&chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct st33zp24_i2c_phy *phy = tpm_dev->phy_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) struct st33zp24_platform_data *pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) pdata = client->dev.platform_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) if (!pdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) dev_err(&client->dev, "No platform data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /* store for late use */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) phy->io_lpcpd = pdata->io_lpcpd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (gpio_is_valid(pdata->io_lpcpd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) ret = devm_gpio_request_one(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) pdata->io_lpcpd, GPIOF_OUT_INIT_HIGH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) "TPM IO_LPCPD");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) dev_err(&client->dev, "Failed to request lpcpd pin\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * st33zp24_i2c_probe initialize the TPM device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * @param: client, the i2c_client description (TPM I2C description).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * @param: id, the i2c_device_id struct.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * @return: 0 in case of success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * -1 in other case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static int st33zp24_i2c_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) struct st33zp24_platform_data *pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct st33zp24_i2c_phy *phy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (!client) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) pr_info("%s: i2c client is NULL. Device not accessible.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) dev_info(&client->dev, "client not i2c capable\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) phy = devm_kzalloc(&client->dev, sizeof(struct st33zp24_i2c_phy),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (!phy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) phy->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) pdata = client->dev.platform_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (!pdata && client->dev.of_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) ret = st33zp24_i2c_of_request_resources(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) } else if (pdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) ret = st33zp24_i2c_request_resources(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) } else if (ACPI_HANDLE(&client->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) ret = st33zp24_i2c_acpi_request_resources(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) return st33zp24_probe(phy, &i2c_phy_ops, &client->dev, client->irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) phy->io_lpcpd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * st33zp24_i2c_remove remove the TPM device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * @param: client, the i2c_client description (TPM I2C description).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * @return: 0 in case of success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) static int st33zp24_i2c_remove(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) struct tpm_chip *chip = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) ret = st33zp24_remove(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) static const struct i2c_device_id st33zp24_i2c_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {TPM_ST33_I2C, 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) MODULE_DEVICE_TABLE(i2c, st33zp24_i2c_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static const struct of_device_id of_st33zp24_i2c_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) { .compatible = "st,st33zp24-i2c", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static const struct acpi_device_id st33zp24_i2c_acpi_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {"SMO3324"},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) MODULE_DEVICE_TABLE(acpi, st33zp24_i2c_acpi_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) static SIMPLE_DEV_PM_OPS(st33zp24_i2c_ops, st33zp24_pm_suspend,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) st33zp24_pm_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static struct i2c_driver st33zp24_i2c_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) .name = TPM_ST33_I2C,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) .pm = &st33zp24_i2c_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) .of_match_table = of_match_ptr(of_st33zp24_i2c_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) .acpi_match_table = ACPI_PTR(st33zp24_i2c_acpi_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) .probe = st33zp24_i2c_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) .remove = st33zp24_i2c_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) .id_table = st33zp24_i2c_id
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) module_i2c_driver(st33zp24_i2c_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) MODULE_AUTHOR("TPM support (TPMsupport@list.st.com)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) MODULE_DESCRIPTION("STM TPM 1.2 I2C ST33 Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) MODULE_VERSION("1.3.0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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