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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.c117
1 files changed, 37 insertions, 80 deletions
diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 1f5f71e14ab..3b7bf216289 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -36,10 +36,8 @@
#include <linux/i2c.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
-#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
-#include <linux/init.h>
#include <linux/wait.h>
#include <linux/string.h>
#include <linux/interrupt.h>
@@ -50,7 +48,6 @@
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/slab.h>
-#include <linux/sched.h>
#include "tpm.h"
#include "tpm_i2c_stm_st33.h"
@@ -178,7 +175,7 @@ static long _wait_for_interrupt_serirq_timeout(struct tpm_chip *chip,
struct i2c_client *client;
struct st33zp24_platform_data *pin_infos;
- client = (struct i2c_client *) TPM_VPRIV(chip);
+ client = (struct i2c_client *)TPM_VPRIV(chip);
pin_infos = client->dev.platform_data;
status = wait_for_completion_interruptible_timeout(
@@ -197,12 +194,12 @@ static int wait_for_serirq_timeout(struct tpm_chip *chip, bool condition,
int status = 2;
struct i2c_client *client;
- client = (struct i2c_client *) TPM_VPRIV(chip);
+ client = (struct i2c_client *)TPM_VPRIV(chip);
status = _wait_for_interrupt_serirq_timeout(chip, timeout);
if (!status) {
status = -EBUSY;
- } else{
+ } else {
clear_interruption(client);
if (condition)
status = 1;
@@ -219,7 +216,7 @@ static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
struct i2c_client *client;
u8 data;
- client = (struct i2c_client *) TPM_VPRIV(chip);
+ client = (struct i2c_client *)TPM_VPRIV(chip);
data = TPM_STS_COMMAND_READY;
I2C_WRITE_DATA(client, TPM_STS, &data, 1);
@@ -236,7 +233,7 @@ static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
{
struct i2c_client *client;
u8 data;
- client = (struct i2c_client *) TPM_VPRIV(chip);
+ client = (struct i2c_client *)TPM_VPRIV(chip);
I2C_READ_DATA(client, TPM_STS, &data, 1);
return data;
@@ -254,7 +251,7 @@ static int check_locality(struct tpm_chip *chip)
u8 data;
u8 status;
- client = (struct i2c_client *) TPM_VPRIV(chip);
+ client = (struct i2c_client *)TPM_VPRIV(chip);
status = I2C_READ_DATA(client, TPM_ACCESS, &data, 1);
if (status && (data &
@@ -278,7 +275,7 @@ static int request_locality(struct tpm_chip *chip)
struct i2c_client *client;
u8 data;
- client = (struct i2c_client *) TPM_VPRIV(chip);
+ client = (struct i2c_client *)TPM_VPRIV(chip);
if (check_locality(chip) == chip->vendor.locality)
return chip->vendor.locality;
@@ -294,7 +291,7 @@ static int request_locality(struct tpm_chip *chip)
chip->vendor.timeout_a);
if (rc > 0)
return chip->vendor.locality;
- } else{
+ } else {
stop = jiffies + chip->vendor.timeout_a;
do {
if (check_locality(chip) >= 0)
@@ -316,7 +313,7 @@ static void release_locality(struct tpm_chip *chip)
struct i2c_client *client;
u8 data;
- client = (struct i2c_client *) TPM_VPRIV(chip);
+ client = (struct i2c_client *)TPM_VPRIV(chip);
data = TPM_ACCESS_ACTIVE_LOCALITY;
I2C_WRITE_DATA(client, TPM_ACCESS, &data, 1);
@@ -333,7 +330,7 @@ static int get_burstcount(struct tpm_chip *chip)
int burstcnt, status;
u8 tpm_reg, temp;
- struct i2c_client *client = (struct i2c_client *) TPM_VPRIV(chip);
+ struct i2c_client *client = (struct i2c_client *)TPM_VPRIV(chip);
stop = jiffies + chip->vendor.timeout_d;
do {
@@ -379,7 +376,7 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
mask), timeout);
if (rc > 0)
return 0;
- } else{
+ } else {
stop = jiffies + timeout;
do {
msleep(TPM_TIMEOUT);
@@ -403,7 +400,7 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
int size = 0, burstcnt, len;
struct i2c_client *client;
- client = (struct i2c_client *) TPM_VPRIV(chip);
+ client = (struct i2c_client *)TPM_VPRIV(chip);
while (size < count &&
wait_for_stat(chip,
@@ -412,6 +409,8 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
&chip->vendor.read_queue)
== 0) {
burstcnt = get_burstcount(chip);
+ if (burstcnt < 0)
+ return burstcnt;
len = min_t(int, burstcnt, count - size);
I2C_READ_DATA(client, TPM_DATA_FIFO, buf + size, len);
size += len;
@@ -433,7 +432,7 @@ static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
disable_irq_nosync(irq);
- client = (struct i2c_client *) TPM_VPRIV(chip);
+ client = (struct i2c_client *)TPM_VPRIV(chip);
pin_infos = client->dev.platform_data;
complete(&pin_infos->irq_detection);
@@ -453,8 +452,8 @@ static irqreturn_t tpm_ioserirq_handler(int irq, void *dev_id)
static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
size_t len)
{
- u32 status,
- burstcnt = 0, i, size;
+ u32 status, i, size;
+ int burstcnt = 0;
int ret;
u8 data;
struct i2c_client *client;
@@ -483,8 +482,10 @@ static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
}
}
- for (i = 0 ; i < len - 1 ;) {
+ 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(client, TPM_DATA_FIFO, buf, size);
if (ret < 0)
@@ -547,7 +548,7 @@ static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
goto out;
}
- expected = be32_to_cpu(*(__be32 *) (buf + 2));
+ expected = be32_to_cpu(*(__be32 *)(buf + 2));
if (expected > count) {
size = -EIO;
goto out;
@@ -562,50 +563,17 @@ static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
}
out:
- chip->vendor.cancel(chip);
+ chip->ops->cancel(chip);
release_locality(chip);
return size;
}
static bool tpm_st33_i2c_req_canceled(struct tpm_chip *chip, u8 status)
{
- return (status == TPM_STS_COMMAND_READY);
+ return (status == TPM_STS_COMMAND_READY);
}
-static const struct file_operations tpm_st33_i2c_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .read = tpm_read,
- .write = tpm_write,
- .open = tpm_open,
- .release = tpm_release,
-};
-
-static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
-static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
-static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
-static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
-static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
-static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL);
-static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
-static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
-
-static struct attribute *stm_tpm_attrs[] = {
- &dev_attr_pubek.attr,
- &dev_attr_pcrs.attr,
- &dev_attr_enabled.attr,
- &dev_attr_active.attr,
- &dev_attr_owned.attr,
- &dev_attr_temp_deactivated.attr,
- &dev_attr_caps.attr,
- &dev_attr_cancel.attr, NULL,
-};
-
-static struct attribute_group stm_tpm_attr_grp = {
- .attrs = stm_tpm_attrs
-};
-
-static struct tpm_vendor_specific st_i2c_tpm = {
+static const struct tpm_class_ops st_i2c_tpm = {
.send = tpm_stm_i2c_send,
.recv = tpm_stm_i2c_recv,
.cancel = tpm_stm_i2c_cancel,
@@ -613,11 +581,9 @@ static struct tpm_vendor_specific st_i2c_tpm = {
.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
.req_canceled = tpm_st33_i2c_req_canceled,
- .attr_group = &stm_tpm_attr_grp,
- .miscdev = {.fops = &tpm_st33_i2c_fops,},
};
-static int interrupts ;
+static int interrupts;
module_param(interrupts, int, 0444);
MODULE_PARM_DESC(interrupts, "Enable interrupts");
@@ -714,7 +680,7 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
"TPM SERIRQ management", chip);
if (err < 0) {
dev_err(chip->dev , "TPM SERIRQ signals %d not available\n",
- gpio_to_irq(platform_data->io_serirq));
+ gpio_to_irq(platform_data->io_serirq));
goto _irq_set;
}
@@ -749,12 +715,10 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
tpm_get_timeouts(chip);
- i2c_set_clientdata(client, chip);
-
dev_info(chip->dev, "TPM I2C Initialized\n");
return 0;
_irq_set:
- free_irq(gpio_to_irq(platform_data->io_serirq), (void *) chip);
+ free_irq(gpio_to_irq(platform_data->io_serirq), (void *)chip);
_gpio_init2:
if (interrupts)
gpio_free(platform_data->io_serirq);
@@ -784,7 +748,7 @@ static int tpm_st33_i2c_remove(struct i2c_client *client)
{
struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client);
struct st33zp24_platform_data *pin_infos =
- ((struct i2c_client *) TPM_VPRIV(chip))->dev.platform_data;
+ ((struct i2c_client *)TPM_VPRIV(chip))->dev.platform_data;
if (pin_infos != NULL) {
free_irq(pin_infos->io_serirq, chip);
@@ -810,24 +774,18 @@ static int tpm_st33_i2c_remove(struct i2c_client *client)
#ifdef CONFIG_PM_SLEEP
/*
* tpm_st33_i2c_pm_suspend suspend the TPM device
- * Added: Work around when suspend and no tpm application is running, suspend
- * may fail because chip->data_buffer is not set (only set in tpm_open in Linux
- * TPM core)
* @param: client, the i2c_client drescription (TPM I2C description).
* @param: mesg, the power management message.
* @return: 0 in case of success.
*/
static int tpm_st33_i2c_pm_suspend(struct device *dev)
{
- struct tpm_chip *chip = dev_get_drvdata(dev);
struct st33zp24_platform_data *pin_infos = dev->platform_data;
int ret = 0;
- if (power_mgt)
+ if (power_mgt) {
gpio_set_value(pin_infos->io_lpcpd, 0);
- else{
- if (chip->data_buffer == NULL)
- chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
+ } else {
ret = tpm_pm_suspend(dev);
}
return ret;
@@ -848,15 +806,13 @@ static int tpm_st33_i2c_pm_resume(struct device *dev)
if (power_mgt) {
gpio_set_value(pin_infos->io_lpcpd, 1);
ret = wait_for_serirq_timeout(chip,
- (chip->vendor.status(chip) &
+ (chip->ops->status(chip) &
TPM_STS_VALID) == TPM_STS_VALID,
chip->vendor.timeout_b);
- } else{
- if (chip->data_buffer == NULL)
- chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
- ret = tpm_pm_resume(dev);
- if (!ret)
- tpm_do_selftest(chip);
+ } else {
+ ret = tpm_pm_resume(dev);
+ if (!ret)
+ tpm_do_selftest(chip);
}
return ret;
} /* tpm_st33_i2c_pm_resume() */
@@ -867,7 +823,8 @@ static const struct i2c_device_id tpm_st33_i2c_id[] = {
{}
};
MODULE_DEVICE_TABLE(i2c, tpm_st33_i2c_id);
-static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend, tpm_st33_i2c_pm_resume);
+static SIMPLE_DEV_PM_OPS(tpm_st33_i2c_ops, tpm_st33_i2c_pm_suspend,
+ tpm_st33_i2c_pm_resume);
static struct i2c_driver tpm_st33_i2c_driver = {
.driver = {
.owner = THIS_MODULE,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-20 18:47:30 +0000