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path: root/drivers/char/tpm/tpm_i2c_stm_st33.c
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Diffstat (limited to 'drivers/char/tpm/tpm_i2c_stm_st33.c')
-rw-r--r--drivers/char/tpm/tpm_i2c_stm_st33.c911
1 files changed, 0 insertions, 911 deletions
diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
deleted file mode 100644
index 612845b36c29..000000000000
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ /dev/null
@@ -1,911 +0,0 @@
-/*
- * STMicroelectronics TPM I2C Linux driver for TPM ST33ZP24
- * Copyright (C) 2009, 2010, 2014 STMicroelectronics
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- *
- * STMicroelectronics version 1.2.1, Copyright (C) 2014
- * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
- * This is free software, and you are welcome to redistribute it
- * under certain conditions.
- *
- * @Author: Christophe RICARD tpmsupport@st.com
- *
- * @File: tpm_stm_st33_i2c.c
- *
- * @Synopsis:
- * 09/15/2010: First shot driver tpm_tis driver for
- * lpc is used as model.
- */
-
-#include <linux/pci.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/i2c.h>
-#include <linux/fs.h>
-#include <linux/miscdevice.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/wait.h>
-#include <linux/freezer.h>
-#include <linux/string.h>
-#include <linux/interrupt.h>
-#include <linux/sysfs.h>
-#include <linux/gpio.h>
-#include <linux/sched.h>
-#include <linux/uaccess.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-#include <linux/of_irq.h>
-#include <linux/of_gpio.h>
-
-#include <linux/platform_data/tpm_stm_st33.h>
-#include "tpm.h"
-
-#define TPM_ACCESS 0x0
-#define TPM_STS 0x18
-#define TPM_HASH_END 0x20
-#define TPM_DATA_FIFO 0x24
-#define TPM_HASH_DATA 0x24
-#define TPM_HASH_START 0x28
-#define TPM_INTF_CAPABILITY 0x14
-#define TPM_INT_STATUS 0x10
-#define TPM_INT_ENABLE 0x08
-
-#define TPM_DUMMY_BYTE 0xAA
-#define TPM_WRITE_DIRECTION 0x80
-#define TPM_HEADER_SIZE 10
-#define TPM_BUFSIZE 2048
-
-#define LOCALITY0 0
-
-
-enum stm33zp24_access {
- TPM_ACCESS_VALID = 0x80,
- TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
- TPM_ACCESS_REQUEST_PENDING = 0x04,
- TPM_ACCESS_REQUEST_USE = 0x02,
-};
-
-enum stm33zp24_status {
- TPM_STS_VALID = 0x80,
- TPM_STS_COMMAND_READY = 0x40,
- TPM_STS_GO = 0x20,
- TPM_STS_DATA_AVAIL = 0x10,
- TPM_STS_DATA_EXPECT = 0x08,
-};
-
-enum stm33zp24_int_flags {
- TPM_GLOBAL_INT_ENABLE = 0x80,
- TPM_INTF_CMD_READY_INT = 0x080,
- TPM_INTF_FIFO_AVALAIBLE_INT = 0x040,
- TPM_INTF_WAKE_UP_READY_INT = 0x020,
- TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
- TPM_INTF_STS_VALID_INT = 0x002,
- TPM_INTF_DATA_AVAIL_INT = 0x001,
-};
-
-enum tis_defaults {
- TIS_SHORT_TIMEOUT = 750,
- TIS_LONG_TIMEOUT = 2000,
-};
-
-struct tpm_stm_dev {
- struct i2c_client *client;
- struct tpm_chip *chip;
- u8 buf[TPM_BUFSIZE + 1];
- u32 intrs;
- int io_lpcpd;
-};
-
-/*
- * write8_reg
- * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
- * @param: tpm_register, the tpm tis register where the data should be written
- * @param: tpm_data, the tpm_data to write inside the tpm_register
- * @param: tpm_size, The length of the data
- * @return: Returns negative errno, or else the number of bytes written.
- */
-static int write8_reg(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
- u8 *tpm_data, u16 tpm_size)
-{
- tpm_dev->buf[0] = tpm_register;
- memcpy(tpm_dev->buf + 1, tpm_data, tpm_size);
- return i2c_master_send(tpm_dev->client, tpm_dev->buf, tpm_size + 1);
-} /* write8_reg() */
-
-/*
- * read8_reg
- * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
- * @param: tpm_register, the tpm tis register where the data should be read
- * @param: tpm_data, the TPM response
- * @param: tpm_size, tpm TPM response size to read.
- * @return: number of byte read successfully: should be one if success.
- */
-static int read8_reg(struct tpm_stm_dev *tpm_dev, u8 tpm_register,
- u8 *tpm_data, int tpm_size)
-{
- u8 status = 0;
- u8 data;
-
- data = TPM_DUMMY_BYTE;
- status = write8_reg(tpm_dev, tpm_register, &data, 1);
- if (status == 2)
- status = i2c_master_recv(tpm_dev->client, tpm_data, tpm_size);
- return status;
-} /* read8_reg() */
-
-/*
- * I2C_WRITE_DATA
- * Send byte to the TIS register according to the ST33ZP24 I2C protocol.
- * @param: tpm_dev, the chip description
- * @param: tpm_register, the tpm tis register where the data should be written
- * @param: tpm_data, the tpm_data to write inside the tpm_register
- * @param: tpm_size, The length of the data
- * @return: number of byte written successfully: should be one if success.
- */
-#define I2C_WRITE_DATA(tpm_dev, tpm_register, tpm_data, tpm_size) \
- (write8_reg(tpm_dev, tpm_register | \
- TPM_WRITE_DIRECTION, tpm_data, tpm_size))
-
-/*
- * I2C_READ_DATA
- * Recv byte from the TIS register according to the ST33ZP24 I2C protocol.
- * @param: tpm_dev, the chip description
- * @param: tpm_register, the tpm tis register where the data should be read
- * @param: tpm_data, the TPM response
- * @param: tpm_size, tpm TPM response size to read.
- * @return: number of byte read successfully: should be one if success.
- */
-#define I2C_READ_DATA(tpm_dev, tpm_register, tpm_data, tpm_size) \
- (read8_reg(tpm_dev, tpm_register, tpm_data, tpm_size))
-
-/*
- * clear_interruption
- * clear the TPM interrupt register.
- * @param: tpm, the chip description
- * @return: the TPM_INT_STATUS value
- */
-static u8 clear_interruption(struct tpm_stm_dev *tpm_dev)
-{
- u8 interrupt;
-
- I2C_READ_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
- I2C_WRITE_DATA(tpm_dev, TPM_INT_STATUS, &interrupt, 1);
- return interrupt;
-} /* clear_interruption() */
-
-/*
- * tpm_stm_i2c_cancel, cancel is not implemented.
- * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h
- */
-static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
-{
- struct tpm_stm_dev *tpm_dev;
- u8 data;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
- data = TPM_STS_COMMAND_READY;
- I2C_WRITE_DATA(tpm_dev, TPM_STS, &data, 1);
-} /* tpm_stm_i2c_cancel() */
-
-/*
- * tpm_stm_spi_status return the TPM_STS register
- * @param: chip, the tpm chip description
- * @return: the TPM_STS register value.
- */
-static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
-{
- struct tpm_stm_dev *tpm_dev;
- u8 data;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
- I2C_READ_DATA(tpm_dev, TPM_STS, &data, 1);
- return data;
-} /* tpm_stm_i2c_status() */
-
-
-/*
- * check_locality if the locality is active
- * @param: chip, the tpm chip description
- * @return: the active locality or -EACCESS.
- */
-static int check_locality(struct tpm_chip *chip)
-{
- struct tpm_stm_dev *tpm_dev;
- u8 data;
- u8 status;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
- status = I2C_READ_DATA(tpm_dev, TPM_ACCESS, &data, 1);
- if (status && (data &
- (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
- (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID))
- return chip->vendor.locality;
-
- return -EACCES;
-} /* check_locality() */
-
-/*
- * request_locality request the TPM locality
- * @param: chip, the chip description
- * @return: the active locality or EACCESS.
- */
-static int request_locality(struct tpm_chip *chip)
-{
- unsigned long stop;
- long ret;
- struct tpm_stm_dev *tpm_dev;
- u8 data;
-
- if (check_locality(chip) == chip->vendor.locality)
- return chip->vendor.locality;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
- data = TPM_ACCESS_REQUEST_USE;
- ret = I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
- if (ret < 0)
- goto end;
-
- stop = jiffies + chip->vendor.timeout_a;
-
- /* Request locality is usually effective after the request */
- do {
- if (check_locality(chip) >= 0)
- return chip->vendor.locality;
- msleep(TPM_TIMEOUT);
- } while (time_before(jiffies, stop));
- ret = -EACCES;
-end:
- return ret;
-} /* request_locality() */
-
-/*
- * release_locality release the active locality
- * @param: chip, the tpm chip description.
- */
-static void release_locality(struct tpm_chip *chip)
-{
- struct tpm_stm_dev *tpm_dev;
- u8 data;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
- data = TPM_ACCESS_ACTIVE_LOCALITY;
-
- I2C_WRITE_DATA(tpm_dev, TPM_ACCESS, &data, 1);
-}
-
-/*
- * get_burstcount return the burstcount address 0x19 0x1A
- * @param: chip, the chip description
- * return: the burstcount.
- */
-static int get_burstcount(struct tpm_chip *chip)
-{
- unsigned long stop;
- int burstcnt, status;
- u8 tpm_reg, temp;
- struct tpm_stm_dev *tpm_dev;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
- stop = jiffies + chip->vendor.timeout_d;
- do {
- tpm_reg = TPM_STS + 1;
- status = I2C_READ_DATA(tpm_dev, tpm_reg, &temp, 1);
- if (status < 0)
- goto end;
-
- tpm_reg = tpm_reg + 1;
- burstcnt = temp;
- status = I2C_READ_DATA(tpm_dev, tpm_reg, &temp, 1);
- if (status < 0)
- goto end;
-
- burstcnt |= temp << 8;
- if (burstcnt)
- return burstcnt;
- msleep(TPM_TIMEOUT);
- } while (time_before(jiffies, stop));
-
-end:
- return -EBUSY;
-} /* get_burstcount() */
-
-static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
- bool check_cancel, bool *canceled)
-{
- u8 status = chip->ops->status(chip);
-
- *canceled = false;
- if ((status & mask) == mask)
- return true;
- if (check_cancel && chip->ops->req_canceled(chip, status)) {
- *canceled = true;
- return true;
- }
- return false;
-}
-
-/*
- * interrupt_to_status
- * @param: irq_mask, the irq mask value to wait
- * @return: the corresponding tpm_sts value
- */
-static u8 interrupt_to_status(u8 irq_mask)
-{
- u8 status = 0;
-
- if ((irq_mask & TPM_INTF_STS_VALID_INT) == TPM_INTF_STS_VALID_INT)
- status |= TPM_STS_VALID;
- if ((irq_mask & TPM_INTF_DATA_AVAIL_INT) == TPM_INTF_DATA_AVAIL_INT)
- status |= TPM_STS_DATA_AVAIL;
- if ((irq_mask & TPM_INTF_CMD_READY_INT) == TPM_INTF_CMD_READY_INT)
- status |= TPM_STS_COMMAND_READY;
-
- return status;
-} /* status_to_interrupt() */
-
-/*
- * wait_for_stat wait for a TPM_STS value
- * @param: chip, the tpm chip description
- * @param: mask, the value mask to wait
- * @param: timeout, the timeout
- * @param: queue, the wait queue.
- * @param: check_cancel, does the command can be cancelled ?
- * @return: the tpm status, 0 if success, -ETIME if timeout is reached.
- */
-static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
- wait_queue_head_t *queue, bool check_cancel)
-{
- unsigned long stop;
- int ret;
- bool canceled = false;
- bool condition;
- u32 cur_intrs;
- u8 interrupt, status;
- struct tpm_stm_dev *tpm_dev;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
- /* check current status */
- status = tpm_stm_i2c_status(chip);
- if ((status & mask) == mask)
- return 0;
-
- stop = jiffies + timeout;
-
- if (chip->vendor.irq) {
- cur_intrs = tpm_dev->intrs;
- interrupt = clear_interruption(tpm_dev);
- enable_irq(chip->vendor.irq);
-
-again:
- timeout = stop - jiffies;
- if ((long) timeout <= 0)
- return -1;
-
- ret = wait_event_interruptible_timeout(*queue,
- cur_intrs != tpm_dev->intrs, timeout);
-
- interrupt |= clear_interruption(tpm_dev);
- status = interrupt_to_status(interrupt);
- condition = wait_for_tpm_stat_cond(chip, mask,
- check_cancel, &canceled);
-
- if (ret >= 0 && condition) {
- if (canceled)
- return -ECANCELED;
- return 0;
- }
- if (ret == -ERESTARTSYS && freezing(current)) {
- clear_thread_flag(TIF_SIGPENDING);
- goto again;
- }
- disable_irq_nosync(chip->vendor.irq);
-
- } else {
- do {
- msleep(TPM_TIMEOUT);
- status = chip->ops->status(chip);
- if ((status & mask) == mask)
- return 0;
- } while (time_before(jiffies, stop));
- }
-
- return -ETIME;
-} /* wait_for_stat() */
-
-/*
- * recv_data receive data
- * @param: chip, the tpm chip description
- * @param: buf, the buffer where the data are received
- * @param: count, the number of data to receive
- * @return: the number of bytes read from TPM FIFO.
- */
-static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
-{
- int size = 0, burstcnt, len, ret;
- struct tpm_stm_dev *tpm_dev;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
- while (size < count &&
- wait_for_stat(chip,
- TPM_STS_DATA_AVAIL | TPM_STS_VALID,
- chip->vendor.timeout_c,
- &chip->vendor.read_queue, true) == 0) {
- burstcnt = get_burstcount(chip);
- if (burstcnt < 0)
- return burstcnt;
- len = min_t(int, burstcnt, count - size);
- ret = I2C_READ_DATA(tpm_dev, TPM_DATA_FIFO, buf + size, len);
- if (ret < 0)
- return ret;
-
- size += len;
- }
- return size;
-}
-
-/*
- * tpm_ioserirq_handler the serirq irq handler
- * @param: irq, the tpm chip description
- * @param: dev_id, the description of the chip
- * @return: the status of the handler.
- */
-static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
-{
- struct tpm_chip *chip = dev_id;
- struct tpm_stm_dev *tpm_dev;
-
- tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
-
- tpm_dev->intrs++;
- 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");