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3b09825dd8
Fixed some coding style issues reported by checkpatch. Signed-off-by: Bruno E O Meneguele <bmeneguele@gmail.com> [phuewe: ported to latest code] Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
912 lines
23 KiB
C
912 lines
23 KiB
C
/*
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* STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
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* Copyright (C) 2009, 2010, 2014 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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* STMicroelectronics version 1.2.1, Copyright (C) 2014
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* STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
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* This is free software, and you are welcome to redistribute it
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* under certain conditions.
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*
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* @Author: Christophe RICARD tpmsupport@st.com
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*
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* @File: tpm_stm_st33_i2c.c
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*
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* @Synopsis:
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* 09/15/2010: First shot driver tpm_tis driver for
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* lpc is used as model.
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*/
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/wait.h>
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#include <linux/freezer.h>
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#include <linux/string.h>
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#include <linux/interrupt.h>
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#include <linux/sysfs.h>
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#include <linux/gpio.h>
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#include <linux/sched.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/slab.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/platform_data/tpm_stm_st33.h>
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#include "tpm.h"
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#define TPM_ACCESS 0x0
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#define TPM_STS 0x18
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#define TPM_HASH_END 0x20
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#define TPM_DATA_FIFO 0x24
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#define TPM_HASH_DATA 0x24
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#define TPM_HASH_START 0x28
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#define TPM_INTF_CAPABILITY 0x14
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#define TPM_INT_STATUS 0x10
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#define TPM_INT_ENABLE 0x08
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#define TPM_DUMMY_BYTE 0xAA
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#define TPM_WRITE_DIRECTION 0x80
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#define TPM_HEADER_SIZE 10
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#define TPM_BUFSIZE 2048
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#define LOCALITY0 0
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enum stm33zp24_access {
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TPM_ACCESS_VALID = 0x80,
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TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
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TPM_ACCESS_REQUEST_PENDING = 0x04,
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TPM_ACCESS_REQUEST_USE = 0x02,
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};
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enum stm33zp24_status {
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TPM_STS_VALID = 0x80,
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TPM_STS_COMMAND_READY = 0x40,
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TPM_STS_GO = 0x20,
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TPM_STS_DATA_AVAIL = 0x10,
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TPM_STS_DATA_EXPECT = 0x08,
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};
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enum stm33zp24_int_flags {
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TPM_GLOBAL_INT_ENABLE = 0x80,
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TPM_INTF_CMD_READY_INT = 0x080,
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TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
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TPM_INTF_WAKE_UP_READY_INT = 0x020,
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TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
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TPM_INTF_STS_VALID_INT = 0x002,
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TPM_INTF_DATA_AVAIL_INT = 0x001,
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};
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enum tis_defaults {
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TIS_SHORT_TIMEOUT = 750,
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TIS_LONG_TIMEOUT = 2000,
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};
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struct tpm_stm_dev {
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struct i2c_client *client;
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struct tpm_chip *chip;
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u8 buf[TPM_BUFSIZE + 1];
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u32 intrs;
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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(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
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u8 *tpm_data, u16 tpm_size)
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{
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tpm_dev->buf[0] = tpm_register;
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memcpy(tpm_dev->buf + 1, tpm_data, tpm_size);
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return i2c_master_send(tpm_dev->client, tpm_dev->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(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
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u8 *tpm_data, int tpm_size)
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{
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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(tpm_dev, tpm_register, &data, 1);
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if (status == 2)
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status = i2c_master_recv(tpm_dev->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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* I2C_WRITE_DATA
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* Send byte to the TIS register according to the ST33ZP24 I2C protocol.
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* @param: tpm_dev, the chip 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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#define I2C_WRITE_DATA(tpm_dev, tpm_register, tpm_data, tpm_size) \
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(write8_reg(tpm_dev, tpm_register | \
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TPM_WRITE_DIRECTION, tpm_data, tpm_size))
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/*
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* I2C_READ_DATA
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* Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
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* @param: tpm_dev, the chip 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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#define I2C_READ_DATA(tpm_dev, tpm_register, tpm_data, tpm_size) \
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(read8_reg(tpm_dev, tpm_register, tpm_data, tpm_size))
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/*
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* clear_interruption
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* clear the TPM interrupt register.
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* @param: tpm, the chip description
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* @return: the TPM_INT_STATUS value
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*/
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static u8 clear_interruption(struct tpm_stm_dev *tpm_dev)
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{
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u8 interrupt;
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I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
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I2C_WRITE_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
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return interrupt;
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} /* clear_interruption() */
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/*
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* tpm_stm_i2c_cancel, cancel is not implemented.
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* @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
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*/
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static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
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{
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struct tpm_stm_dev *tpm_dev;
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u8 data;
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tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
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data = TPM_STS_COMMAND_READY;
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I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
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} /* tpm_stm_i2c_cancel() */
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/*
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* tpm_stm_spi_status return the TPM_STS register
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* @param: chip, the tpm chip description
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* @return: the TPM_STS register value.
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*/
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static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
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{
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struct tpm_stm_dev *tpm_dev;
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u8 data;
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tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
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I2C_READ_DATA(tpm_dev, TPM_STS, &data, 1);
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return data;
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} /* tpm_stm_i2c_status() */
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/*
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* check_locality if the locality is active
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* @param: chip, the tpm chip description
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* @return: the active locality or -EACCESS.
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*/
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static int check_locality(struct tpm_chip *chip)
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{
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struct tpm_stm_dev *tpm_dev;
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u8 data;
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u8 status;
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tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
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status = I2C_READ_DATA(tpm_dev, TPM_ACCESS, &data, 1);
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if (status && (data &
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(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
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(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
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return chip->vendor.locality;
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return -EACCES;
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} /* check_locality() */
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/*
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* request_locality request the TPM locality
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* @param: chip, the chip description
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* @return: the active locality or EACCESS.
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*/
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static int request_locality(struct tpm_chip *chip)
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{
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unsigned long stop;
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long ret;
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struct tpm_stm_dev *tpm_dev;
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u8 data;
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if (check_locality(chip) == chip->vendor.locality)
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return chip->vendor.locality;
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tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
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data = TPM_ACCESS_REQUEST_USE;
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ret = I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
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if (ret < 0)
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goto end;
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stop = jiffies + chip->vendor.timeout_a;
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/* Request locality is usually effective after the request */
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do {
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if (check_locality(chip) >= 0)
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return chip->vendor.locality;
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msleep(TPM_TIMEOUT);
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} while (time_before(jiffies, stop));
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ret = -EACCES;
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end:
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return ret;
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} /* request_locality() */
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/*
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* release_locality release the active locality
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* @param: chip, the tpm chip description.
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*/
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static void release_locality(struct tpm_chip *chip)
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{
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struct tpm_stm_dev *tpm_dev;
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u8 data;
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tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
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data = TPM_ACCESS_ACTIVE_LOCALITY;
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I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
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}
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/*
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* get_burstcount return the burstcount address 0x19 0x1A
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* @param: chip, the chip description
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* return: the burstcount.
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*/
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static int get_burstcount(struct tpm_chip *chip)
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{
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unsigned long stop;
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int burstcnt, status;
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u8 tpm_reg, temp;
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struct tpm_stm_dev *tpm_dev;
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tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
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stop = jiffies + chip->vendor.timeout_d;
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do {
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tpm_reg = TPM_STS + 1;
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status = I2C_READ_DATA(tpm_dev, tpm_reg, &temp, 1);
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if (status < 0)
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goto end;
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tpm_reg = tpm_reg + 1;
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burstcnt = temp;
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status = I2C_READ_DATA(tpm_dev, tpm_reg, &temp, 1);
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if (status < 0)
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goto end;
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burstcnt |= temp << 8;
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if (burstcnt)
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return burstcnt;
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msleep(TPM_TIMEOUT);
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} while (time_before(jiffies, stop));
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end:
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return -EBUSY;
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} /* get_burstcount() */
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static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
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bool check_cancel, bool *canceled)
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{
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u8 status = chip->ops->status(chip);
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*canceled = false;
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if ((status & mask) == mask)
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return true;
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if (check_cancel && chip->ops->req_canceled(chip, status)) {
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*canceled = true;
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return true;
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}
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return false;
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}
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/*
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* interrupt_to_status
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* @param: irq_mask, the irq mask value to wait
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* @return: the corresponding tpm_sts value
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*/
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static u8 interrupt_to_status(u8 irq_mask)
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{
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u8 status = 0;
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if ((irq_mask & TPM_INTF_STS_VALID_INT) == TPM_INTF_STS_VALID_INT)
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status |= TPM_STS_VALID;
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if ((irq_mask & TPM_INTF_DATA_AVAIL_INT) == TPM_INTF_DATA_AVAIL_INT)
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status |= TPM_STS_DATA_AVAIL;
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if ((irq_mask & TPM_INTF_CMD_READY_INT) == TPM_INTF_CMD_READY_INT)
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status |= TPM_STS_COMMAND_READY;
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return status;
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} /* status_to_interrupt() */
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/*
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* wait_for_stat wait for a TPM_STS value
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* @param: chip, the tpm chip description
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* @param: mask, the value mask to wait
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* @param: timeout, the timeout
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* @param: queue, the wait queue.
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* @param: check_cancel, does the command can be cancelled ?
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* @return: the tpm status, 0 if success, -ETIME if timeout is reached.
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*/
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static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
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wait_queue_head_t *queue, bool check_cancel)
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{
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unsigned long stop;
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int ret;
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bool canceled = false;
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bool condition;
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u32 cur_intrs;
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u8 interrupt, status;
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struct tpm_stm_dev *tpm_dev;
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tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
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/* check current status */
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status = tpm_stm_i2c_status(chip);
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if ((status & mask) == mask)
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return 0;
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stop = jiffies + timeout;
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if (chip->vendor.irq) {
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cur_intrs = tpm_dev->intrs;
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interrupt = clear_interruption(tpm_dev);
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enable_irq(chip->vendor.irq);
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again:
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timeout = stop - jiffies;
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if ((long) timeout <= 0)
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return -1;
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ret = wait_event_interruptible_timeout(*queue,
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cur_intrs != tpm_dev->intrs, timeout);
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interrupt |= clear_interruption(tpm_dev);
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status = interrupt_to_status(interrupt);
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condition = wait_for_tpm_stat_cond(chip, mask,
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check_cancel, &canceled);
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if (ret >= 0 && condition) {
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if (canceled)
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return -ECANCELED;
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return 0;
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}
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if (ret == -ERESTARTSYS && freezing(current)) {
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clear_thread_flag(TIF_SIGPENDING);
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goto again;
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}
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disable_irq_nosync(chip->vendor.irq);
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} else {
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do {
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msleep(TPM_TIMEOUT);
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status = chip->ops->status(chip);
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if ((status & mask) == mask)
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return 0;
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} while (time_before(jiffies, stop));
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}
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return -ETIME;
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} /* wait_for_stat() */
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/*
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* recv_data receive data
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* @param: chip, the tpm chip description
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* @param: buf, the buffer where the data are received
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* @param: count, the number of data to receive
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* @return: the number of bytes read from TPM FIFO.
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*/
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static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
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{
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int size = 0, burstcnt, len, ret;
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struct tpm_stm_dev *tpm_dev;
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tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
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while (size < count &&
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wait_for_stat(chip,
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TPM_STS_DATA_AVAIL | TPM_STS_VALID,
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chip->vendor.timeout_c,
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&chip->vendor.read_queue, true) == 0) {
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burstcnt = get_burstcount(chip);
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if (burstcnt < 0)
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return burstcnt;
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len = min_t(int, burstcnt, count - size);
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ret = I2C_READ_DATA(tpm_dev, TPM_DATA_FIFO, buf + size, len);
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if (ret < 0)
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return ret;
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size += len;
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}
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return size;
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}
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/*
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* tpm_ioserirq_handler the serirq irq handler
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* @param: irq, the tpm chip description
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* @param: dev_id, the description of the chip
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* @return: the status of the handler.
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*/
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static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
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{
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struct tpm_chip *chip = dev_id;
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struct tpm_stm_dev *tpm_dev;
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tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
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tpm_dev->intrs++;
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wake_up_interruptible(&chip->vendor.read_queue);
|
|
disable_irq_nosync(chip->vendor.irq);
|
|
|
|
return IRQ_HANDLED;
|
|
} /* tpm_ioserirq_handler() */
|
|
|
|
|
|
/*
|
|
* tpm_stm_i2c_send send TPM commands through the I2C bus.
|
|
*
|
|
* @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
|
|
* @param: buf, the buffer to send.
|
|
* @param: count, the number of bytes to send.
|
|
* @return: In case of success the number of bytes sent.
|
|
* In other case, a < 0 value describing the issue.
|
|
*/
|
|
static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
|
|
size_t len)
|
|
{
|
|
u32 status, i, size;
|
|
int burstcnt = 0;
|
|
int ret;
|
|
u8 data;
|
|
struct i2c_client *client;
|
|
struct tpm_stm_dev *tpm_dev;
|
|
|
|
if (!chip)
|
|
return -EBUSY;
|
|
if (len < TPM_HEADER_SIZE)
|
|
return -EBUSY;
|
|
|
|
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
|
client = tpm_dev->client;
|
|
|
|
client->flags = 0;
|
|
|
|
ret = request_locality(chip);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
status = tpm_stm_i2c_status(chip);
|
|
if ((status & TPM_STS_COMMAND_READY) == 0) {
|
|
tpm_stm_i2c_cancel(chip);
|
|
if (wait_for_stat
|
|
(chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
|
|
&chip->vendor.read_queue, false) < 0) {
|
|
ret = -ETIME;
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < len - 1;) {
|
|
burstcnt = get_burstcount(chip);
|
|
if (burstcnt < 0)
|
|
return burstcnt;
|
|
size = min_t(int, len - i - 1, burstcnt);
|
|
ret = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf + i, size);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
i += size;
|
|
}
|
|
|
|
status = tpm_stm_i2c_status(chip);
|
|
if ((status & TPM_STS_DATA_EXPECT) == 0) {
|
|
ret = -EIO;
|
|
goto out_err;
|
|
}
|
|
|
|
ret = I2C_WRITE_DATA(tpm_dev, TPM_DATA_FIFO, buf + len - 1, 1);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
|
|
status = tpm_stm_i2c_status(chip);
|
|
if ((status & TPM_STS_DATA_EXPECT) != 0) {
|
|
ret = -EIO;
|
|
goto out_err;
|
|
}
|
|
|
|
data = TPM_STS_GO;
|
|
I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
|
|
|
|
return len;
|
|
out_err:
|
|
tpm_stm_i2c_cancel(chip);
|
|
release_locality(chip);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* tpm_stm_i2c_recv received TPM response through the I2C bus.
|
|
* @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
|
|
* @param: buf, the buffer to store datas.
|
|
* @param: count, the number of bytes to send.
|
|
* @return: In case of success the number of bytes received.
|
|
* In other case, a < 0 value describing the issue.
|
|
*/
|
|
static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
|
|
size_t count)
|
|
{
|
|
int size = 0;
|
|
int expected;
|
|
|
|
if (!chip)
|
|
return -EBUSY;
|
|
|
|
if (count < TPM_HEADER_SIZE) {
|
|
size = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
size = recv_data(chip, buf, TPM_HEADER_SIZE);
|
|
if (size < TPM_HEADER_SIZE) {
|
|
dev_err(chip->pdev, "Unable to read header\n");
|
|
goto out;
|
|
}
|
|
|
|
expected = be32_to_cpu(*(__be32 *)(buf + 2));
|
|
if (expected > count) {
|
|
size = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
size += recv_data(chip, &buf[TPM_HEADER_SIZE],
|
|
expected - TPM_HEADER_SIZE);
|
|
if (size < expected) {
|
|
dev_err(chip->pdev, "Unable to read remainder of result\n");
|
|
size = -ETIME;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
chip->ops->cancel(chip);
|
|
release_locality(chip);
|
|
return size;
|
|
}
|
|
|
|
static bool tpm_stm_i2c_req_canceled(struct tpm_chip *chip, u8 status)
|
|
{
|
|
return (status == TPM_STS_COMMAND_READY);
|
|
}
|
|
|
|
static const struct tpm_class_ops st_i2c_tpm = {
|
|
.send = tpm_stm_i2c_send,
|
|
.recv = tpm_stm_i2c_recv,
|
|
.cancel = tpm_stm_i2c_cancel,
|
|
.status = tpm_stm_i2c_status,
|
|
.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
|
.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
|
|
.req_canceled = tpm_stm_i2c_req_canceled,
|
|
};
|
|
|
|
#ifdef CONFIG_OF
|
|
static int tpm_stm_i2c_of_request_resources(struct tpm_chip *chip)
|
|
{
|
|
struct device_node *pp;
|
|
struct tpm_stm_dev *tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
|
struct i2c_client *client = tpm_dev->client;
|
|
int gpio;
|
|
int ret;
|
|
|
|
pp = client->dev.of_node;
|
|
if (!pp) {
|
|
dev_err(chip->pdev, "No platform data\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Get GPIO from device tree */
|
|
gpio = of_get_named_gpio(pp, "lpcpd-gpios", 0);
|
|
if (gpio < 0) {
|
|
dev_err(chip->pdev, "Failed to retrieve lpcpd-gpios from dts.\n");
|
|
tpm_dev->io_lpcpd = -1;
|
|
/*
|
|
* lpcpd pin is not specified. This is not an issue as
|
|
* power management can be also managed by TPM specific
|
|
* commands. So leave with a success status code.
|
|
*/
|
|
return 0;
|
|
}
|
|
/* GPIO request and configuration */
|
|
ret = devm_gpio_request_one(&client->dev, gpio,
|
|
GPIOF_OUT_INIT_HIGH, "TPM IO LPCPD");
|
|
if (ret) {
|
|
dev_err(chip->pdev, "Failed to request lpcpd pin\n");
|
|
return -ENODEV;
|
|
}
|
|
tpm_dev->io_lpcpd = gpio;
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
static int tpm_stm_i2c_of_request_resources(struct tpm_chip *chip)
|
|
{
|
|
return -ENODEV;
|
|
}
|
|
#endif
|
|
|
|
static int tpm_stm_i2c_request_resources(struct i2c_client *client,
|
|
struct tpm_chip *chip)
|
|
{
|
|
struct st33zp24_platform_data *pdata;
|
|
struct tpm_stm_dev *tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
|
|
int ret;
|
|
|
|
pdata = client->dev.platform_data;
|
|
if (!pdata) {
|
|
dev_err(chip->pdev, "No platform data\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* store for late use */
|
|
tpm_dev->io_lpcpd = pdata->io_lpcpd;
|
|
|
|
if (gpio_is_valid(pdata->io_lpcpd)) {
|
|
ret = devm_gpio_request_one(&client->dev,
|
|
pdata->io_lpcpd, GPIOF_OUT_INIT_HIGH,
|
|
"TPM IO_LPCPD");
|
|
if (ret) {
|
|
dev_err(chip->pdev, "%s : reset gpio_request failed\n",
|
|
__FILE__);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* tpm_stm_i2c_probe initialize the TPM device
|
|
* @param: client, the i2c_client drescription (TPM I2C description).
|
|
* @param: id, the i2c_device_id struct.
|
|
* @return: 0 in case of success.
|
|
* -1 in other case.
|
|
*/
|
|
static int
|
|
tpm_stm_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
|
|
{
|
|
int ret;
|
|
u8 intmask = 0;
|
|
struct tpm_chip *chip;
|
|
struct st33zp24_platform_data *platform_data;
|
|
struct tpm_stm_dev *tpm_dev;
|
|
|
|
if (!client) {
|
|
pr_info("%s: i2c client is NULL. Device not accessible.\n",
|
|
__func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
|
dev_info(&client->dev, "client not i2c capable\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
tpm_dev = devm_kzalloc(&client->dev, sizeof(struct tpm_stm_dev),
|
|
GFP_KERNEL);
|
|
if (!tpm_dev)
|
|
return -ENOMEM;
|
|
|
|
chip = tpmm_chip_alloc(&client->dev, &st_i2c_tpm);
|
|
if (IS_ERR(chip))
|
|
return PTR_ERR(chip);
|
|
|
|
TPM_VPRIV(chip) = tpm_dev;
|
|
tpm_dev->client = client;
|
|
|
|
platform_data = client->dev.platform_data;
|
|
if (!platform_data && client->dev.of_node) {
|
|
ret = tpm_stm_i2c_of_request_resources(chip);
|
|
if (ret)
|
|
goto _tpm_clean_answer;
|
|
} else if (platform_data) {
|
|
ret = tpm_stm_i2c_request_resources(client, chip);
|
|
if (ret)
|
|
goto _tpm_clean_answer;
|
|
}
|
|
|
|
chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
|
|
chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
|
|
chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
|
|
chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
|
|
|
|
chip->vendor.locality = LOCALITY0;
|
|
|
|
if (client->irq) {
|
|
/* INTERRUPT Setup */
|
|
init_waitqueue_head(&chip->vendor.read_queue);
|
|
tpm_dev->intrs = 0;
|
|
|
|
if (request_locality(chip) != LOCALITY0) {
|
|
ret = -ENODEV;
|
|
goto _tpm_clean_answer;
|
|
}
|
|
|
|
clear_interruption(tpm_dev);
|
|
ret = devm_request_irq(&client->dev, client->irq,
|
|
tpm_ioserirq_handler,
|
|
IRQF_TRIGGER_HIGH,
|
|
"TPM SERIRQ management", chip);
|
|
if (ret < 0) {
|
|
dev_err(chip->pdev, "TPM SERIRQ signals %d not available\n",
|
|
client->irq);
|
|
goto _tpm_clean_answer;
|
|
}
|
|
|
|
intmask |= TPM_INTF_CMD_READY_INT
|
|
| TPM_INTF_STS_VALID_INT
|
|
| TPM_INTF_DATA_AVAIL_INT;
|
|
|
|
ret = I2C_WRITE_DATA(tpm_dev, TPM_INT_ENABLE, &intmask, 1);
|
|
if (ret < 0)
|
|
goto _tpm_clean_answer;
|
|
|
|
intmask = TPM_GLOBAL_INT_ENABLE;
|
|
ret = I2C_WRITE_DATA(tpm_dev, (TPM_INT_ENABLE + 3),
|
|
&intmask, 1);
|
|
if (ret < 0)
|
|
goto _tpm_clean_answer;
|
|
|
|
chip->vendor.irq = client->irq;
|
|
|
|
disable_irq_nosync(chip->vendor.irq);
|
|
|
|
tpm_gen_interrupt(chip);
|
|
}
|
|
|
|
tpm_get_timeouts(chip);
|
|
tpm_do_selftest(chip);
|
|
|
|
return tpm_chip_register(chip);
|
|
_tpm_clean_answer:
|
|
dev_info(chip->pdev, "TPM I2C initialisation fail\n");
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* tpm_stm_i2c_remove remove the TPM device
|
|
* @param: client, the i2c_client description (TPM I2C description).
|
|
* @return: 0 in case of success.
|
|
*/
|
|
static int tpm_stm_i2c_remove(struct i2c_client *client)
|
|
{
|
|
struct tpm_chip *chip =
|
|
(struct tpm_chip *) i2c_get_clientdata(client);
|
|
|
|
if (chip)
|
|
tpm_chip_unregister(chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/*
|
|
* tpm_stm_i2c_pm_suspend suspend the TPM device
|
|
* @param: client, the i2c_client drescription (TPM I2C description).
|
|
* @param: mesg, the power management message.
|
|
* @return: 0 in case of success.
|
|
*/
|
|
static int tpm_stm_i2c_pm_suspend(struct device *dev)
|
|
{
|
|
struct st33zp24_platform_data *pin_infos = dev->platform_data;
|
|
int ret = 0;
|
|
|
|
if (gpio_is_valid(pin_infos->io_lpcpd))
|
|
gpio_set_value(pin_infos->io_lpcpd, 0);
|
|
else
|
|
ret = tpm_pm_suspend(dev);
|
|
|
|
return ret;
|
|
} /* tpm_stm_i2c_suspend() */
|
|
|
|
/*
|
|
* tpm_stm_i2c_pm_resume resume the TPM device
|
|
* @param: client, the i2c_client drescription (TPM I2C description).
|
|
* @return: 0 in case of success.
|
|
*/
|
|
static int tpm_stm_i2c_pm_resume(struct device *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_drvdata(dev);
|
|
struct st33zp24_platform_data *pin_infos = dev->platform_data;
|
|
|
|
int ret = 0;
|
|
|
|
if (gpio_is_valid(pin_infos->io_lpcpd)) {
|
|
gpio_set_value(pin_infos->io_lpcpd, 1);
|
|
ret = wait_for_stat(chip,
|
|
TPM_STS_VALID, chip->vendor.timeout_b,
|
|
&chip->vendor.read_queue, false);
|
|
} else {
|
|
ret = tpm_pm_resume(dev);
|
|
if (!ret)
|
|
tpm_do_selftest(chip);
|
|
}
|
|
return ret;
|
|
} /* tpm_stm_i2c_pm_resume() */
|
|
#endif
|
|
|
|
static const struct i2c_device_id tpm_stm_i2c_id[] = {
|
|
{TPM_ST33_I2C, 0},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, tpm_stm_i2c_id);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id of_st33zp24_i2c_match[] = {
|
|
{ .compatible = "st,st33zp24-i2c", },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_st33zp24_i2c_match);
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(tpm_stm_i2c_ops, tpm_stm_i2c_pm_suspend,
|
|
tpm_stm_i2c_pm_resume);
|
|
|
|
static struct i2c_driver tpm_stm_i2c_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = TPM_ST33_I2C,
|
|
.pm = &tpm_stm_i2c_ops,
|
|
.of_match_table = of_match_ptr(of_st33zp24_i2c_match),
|
|
},
|
|
.probe = tpm_stm_i2c_probe,
|
|
.remove = tpm_stm_i2c_remove,
|
|
.id_table = tpm_stm_i2c_id
|
|
};
|
|
|
|
module_i2c_driver(tpm_stm_i2c_driver);
|
|
|
|
MODULE_AUTHOR("Christophe Ricard (tpmsupport@st.com)");
|
|
MODULE_DESCRIPTION("STM TPM I2C ST33 Driver");
|
|
MODULE_VERSION("1.2.1");
|
|
MODULE_LICENSE("GPL");
|