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Merge branch 'tpmdd-04-17-13' of git://github.com/shpedoikal/linux into my-next

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This commit is contained in:
James Morris 2013-04-20 09:00:45 -07:00
commit b7ae9f064b
6 changed files with 205 additions and 85 deletions
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2
Documentation/devicetree/bindings/i2c/trivial-devices.txt
View File

@ -35,6 +35,8 @@ fsl,mc13892 MC13892: Power Management Integrated Circuit (PMIC) for i.MX35/51
fsl,mma8450 MMA8450Q: Xtrinsic Low-power, 3-axis Xtrinsic Accelerometer
fsl,mpr121 MPR121: Proximity Capacitive Touch Sensor Controller
fsl,sgtl5000 SGTL5000: Ultra Low-Power Audio Codec
infineon,slb9635tt Infineon SLB9635 (Soft-) I2C TPM (old protocol, max 100khz)
infineon,slb9645tt Infineon SLB9645 I2C TPM (new protocol, max 400khz)
maxim,ds1050 5 Bit Programmable, Pulse-Width Modulator
maxim,max1237 Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
maxim,max6625 9-Bit/12-Bit Temperature Sensors with I²C-Compatible Serial Interface

31
drivers/char/tpm/tpm.c
View File

@ -1337,7 +1337,7 @@ int tpm_pm_suspend(struct device *dev)
{
struct tpm_chip *chip = dev_get_drvdata(dev);
struct tpm_cmd_t cmd;
int rc;
int rc, try;
u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
@ -1355,9 +1355,32 @@ int tpm_pm_suspend(struct device *dev)
}
/* now do the actual savestate */
cmd.header.in = savestate_header;
rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
"sending savestate before suspend");
for (try = 0; try < TPM_RETRY; try++) {
cmd.header.in = savestate_header;
rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, NULL);
/*
* If the TPM indicates that it is too busy to respond to
* this command then retry before giving up. It can take
* several seconds for this TPM to be ready.
*
* This can happen if the TPM has already been sent the
* SaveState command before the driver has loaded. TCG 1.2
* specification states that any communication after SaveState
* may cause the TPM to invalidate previously saved state.
*/
if (rc != TPM_WARN_RETRY)
break;
msleep(TPM_TIMEOUT_RETRY);
}
if (rc)
dev_err(chip->dev,
"Error (%d) sending savestate before suspend\n", rc);
else if (try > 0)
dev_warn(chip->dev, "TPM savestate took %dms\n",
try * TPM_TIMEOUT_RETRY);
return rc;
}
EXPORT_SYMBOL_GPL(tpm_pm_suspend);

3
drivers/char/tpm/tpm.h
View File

@ -32,10 +32,12 @@ enum tpm_const {
TPM_MINOR = 224, /* officially assigned */
TPM_BUFSIZE = 4096,
TPM_NUM_DEVICES = 256,
TPM_RETRY = 50, /* 5 seconds */
};
enum tpm_timeout {
TPM_TIMEOUT = 5, /* msecs */
TPM_TIMEOUT_RETRY = 100 /* msecs */
};
/* TPM addresses */
@ -44,6 +46,7 @@ enum tpm_addr {
TPM_ADDR = 0x4E,
};
#define TPM_WARN_RETRY 0x800
#define TPM_WARN_DOING_SELFTEST 0x802
#define TPM_ERR_DEACTIVATED 0x6
#define TPM_ERR_DISABLED 0x7

176
drivers/char/tpm/tpm_i2c_infineon.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2012 Infineon Technologies
* Copyright (C) 2012,2013 Infineon Technologies
*
* Authors:
* Peter Huewe <peter.huewe@infineon.com>
@ -56,13 +56,21 @@
#define TPM_TIMEOUT_US_HI (TPM_TIMEOUT_US_LOW + 2000)
/* expected value for DIDVID register */
#define TPM_TIS_I2C_DID_VID 0x000b15d1L
#define TPM_TIS_I2C_DID_VID_9635 0xd1150b00L
#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
enum i2c_chip_type {
SLB9635,
SLB9645,
UNKNOWN,
};
/* Structure to store I2C TPM specific stuff */
struct tpm_inf_dev {
struct i2c_client *client;
u8 buf[TPM_BUFSIZE + sizeof(u8)]; /* max. buffer size + addr */
struct tpm_chip *chip;
enum i2c_chip_type chip_type;
};
static struct tpm_inf_dev tpm_dev;
@ -90,10 +98,20 @@ static struct i2c_driver tpm_tis_i2c_driver;
static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
{
struct i2c_msg msg1 = { tpm_dev.client->addr, 0, 1, &addr };
struct i2c_msg msg2 = { tpm_dev.client->addr, I2C_M_RD, len, buffer };
struct i2c_msg msg1 = {
.addr = tpm_dev.client->addr,
.len = 1,
.buf = &addr
};
struct i2c_msg msg2 = {
.addr = tpm_dev.client->addr,
.flags = I2C_M_RD,
.len = len,
.buf = buffer
};
struct i2c_msg msgs[] = {msg1, msg2};
int rc;
int rc = 0;
int count;
/* Lock the adapter for the duration of the whole sequence. */
@ -101,30 +119,53 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len)
return -EOPNOTSUPP;
i2c_lock_adapter(tpm_dev.client->adapter);
for (count = 0; count < MAX_COUNT; count++) {
rc = __i2c_transfer(tpm_dev.client->adapter, &msg1, 1);
if (rc > 0)
break; /* break here to skip sleep */
if (tpm_dev.chip_type == SLB9645) {
/* use a combined read for newer chips
* unfortunately the smbus functions are not suitable due to
* the 32 byte limit of the smbus.
* retries should usually not be needed, but are kept just to
* be on the safe side.
*/
for (count = 0; count < MAX_COUNT; count++) {
rc = __i2c_transfer(tpm_dev.client->adapter, msgs, 2);
if (rc > 0)
break; /* break here to skip sleep */
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
}
} else {
/* slb9635 protocol should work in all cases */
for (count = 0; count < MAX_COUNT; count++) {
rc = __i2c_transfer(tpm_dev.client->adapter, &msg1, 1);
if (rc > 0)
break; /* break here to skip sleep */
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
}
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
}
if (rc <= 0)
goto out;
/* After the TPM has successfully received the register address it needs
* some time, thus we're sleeping here again, before retrieving the data
*/
for (count = 0; count < MAX_COUNT; count++) {
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
rc = __i2c_transfer(tpm_dev.client->adapter, &msg2, 1);
if (rc > 0)
break;
if (rc <= 0)
goto out;
/* After the TPM has successfully received the register address
* it needs some time, thus we're sleeping here again, before
* retrieving the data
*/
for (count = 0; count < MAX_COUNT; count++) {
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
rc = __i2c_transfer(tpm_dev.client->adapter, &msg2, 1);
if (rc > 0)
break;
}
}
out:
i2c_unlock_adapter(tpm_dev.client->adapter);
/* take care of 'guard time' */
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
/* __i2c_transfer returns the number of successfully transferred
* messages.
* So rc should be greater than 0 here otherwise we have an error.
*/
if (rc <= 0)
return -EIO;
@ -138,7 +179,11 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
int rc = -EIO;
int count;
struct i2c_msg msg1 = { tpm_dev.client->addr, 0, len + 1, tpm_dev.buf };
struct i2c_msg msg1 = {
.addr = tpm_dev.client->addr,
.len = len + 1,
.buf = tpm_dev.buf
};
if (len > TPM_BUFSIZE)
return -EINVAL;
@ -154,16 +199,24 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len,
/*
* NOTE: We have to use these special mechanisms here and unfortunately
* cannot rely on the standard behavior of i2c_transfer.
* Even for newer chips the smbus functions are not
* suitable due to the 32 byte limit of the smbus.
*/
for (count = 0; count < max_count; count++) {
rc = __i2c_transfer(tpm_dev.client->adapter, &msg1, 1);
if (rc > 0)
break;
usleep_range(sleep_low, sleep_hi);
}
i2c_unlock_adapter(tpm_dev.client->adapter);
/* take care of 'guard time' */
usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI);
/* __i2c_transfer returns the number of successfully transferred
* messages.
* So rc should be greater than 0 here otherwise we have an error.
*/
if (rc <= 0)
return -EIO;
@ -283,11 +336,18 @@ static int request_locality(struct tpm_chip *chip, int loc)
static u8 tpm_tis_i2c_status(struct tpm_chip *chip)
{
/* NOTE: since I2C read may fail, return 0 in this case --> time-out */
u8 buf;
if (iic_tpm_read(TPM_STS(chip->vendor.locality), &buf, 1) < 0)
return 0;
else
return buf;
u8 buf = 0xFF;
u8 i = 0;
do {
if (iic_tpm_read(TPM_STS(chip->vendor.locality), &buf, 1) < 0)
return 0;
i++;
/* if locallity is set STS should not be 0xFF */
} while ((buf == 0xFF) && i < 10);
return buf;
}
static void tpm_tis_i2c_ready(struct tpm_chip *chip)
@ -328,7 +388,7 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
/* check current status */
*status = tpm_tis_i2c_status(chip);
if ((*status & mask) == mask)
if ((*status != 0xFF) && (*status & mask) == mask)
return 0;
stop = jiffies + timeout;
@ -372,7 +432,6 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
/* avoid endless loop in case of broken HW */
if (retries > MAX_COUNT_LONG)
return -EIO;
}
return size;
}
@ -480,7 +539,6 @@ static int tpm_tis_i2c_send(struct tpm_chip *chip, u8 *buf, size_t len)
rc = -EIO;
goto out_err;
}
}
/* write last byte */
@ -568,6 +626,7 @@ static int tpm_tis_i2c_init(struct device *dev)
chip = tpm_register_hardware(dev, &tpm_tis_i2c);
if (!chip) {
dev_err(dev, "could not register hardware\n");
rc = -ENODEV;
goto out_err;
}
@ -582,20 +641,24 @@ static int tpm_tis_i2c_init(struct device *dev)
chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
if (request_locality(chip, 0) != 0) {
dev_err(dev, "could not request locality\n");
rc = -ENODEV;
goto out_vendor;
}
/* read four bytes from DID_VID register */
if (iic_tpm_read(TPM_DID_VID(0), (u8 *)&vendor, 4) < 0) {
dev_err(dev, "could not read vendor id\n");
rc = -EIO;
goto out_release;
}
/* create DID_VID register value, after swapping to little-endian */
vendor = be32_to_cpu((__be32) vendor);
if (vendor != TPM_TIS_I2C_DID_VID) {
if (vendor == TPM_TIS_I2C_DID_VID_9645) {
tpm_dev.chip_type = SLB9645;
} else if (vendor == TPM_TIS_I2C_DID_VID_9635) {
tpm_dev.chip_type = SLB9635;
} else {
dev_err(dev, "vendor id did not match! ID was %08x\n", vendor);
rc = -ENODEV;
goto out_release;
}
@ -631,22 +694,53 @@ out_err:
static const struct i2c_device_id tpm_tis_i2c_table[] = {
{"tpm_i2c_infineon", 0},
{"slb9635tt", 0},
{"slb9645tt", 1},
{},
};
MODULE_DEVICE_TABLE(i2c, tpm_tis_i2c_table);
#ifdef CONFIG_OF
static const struct of_device_id tpm_tis_i2c_of_match[] = {
{
.name = "tpm_i2c_infineon",
.type = "tpm",
.compatible = "infineon,tpm_i2c_infineon",
.data = (void *)0
},
{
.name = "slb9635tt",
.type = "tpm",
.compatible = "infineon,slb9635tt",
.data = (void *)0
},
{
.name = "slb9645tt",
.type = "tpm",
.compatible = "infineon,slb9645tt",
.data = (void *)1
},
{},
};
MODULE_DEVICE_TABLE(of, tpm_tis_i2c_of_match);
#endif
static SIMPLE_DEV_PM_OPS(tpm_tis_i2c_ops, tpm_pm_suspend, tpm_pm_resume);
static int tpm_tis_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int rc;
if (tpm_dev.client != NULL)
struct device *dev = &(client->dev);
if (tpm_dev.client != NULL) {
dev_err(dev, "This driver only supports one client at a time\n");
return -EBUSY; /* We only support one client */
}
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev,
"no algorithms associated to the i2c bus\n");
dev_err(dev, "no algorithms associated to the i2c bus\n");
return -ENODEV;
}
@ -682,7 +776,6 @@ static int tpm_tis_i2c_remove(struct i2c_client *client)
}
static struct i2c_driver tpm_tis_i2c_driver = {
.id_table = tpm_tis_i2c_table,
.probe = tpm_tis_i2c_probe,
.remove = tpm_tis_i2c_remove,
@ -690,11 +783,12 @@ static struct i2c_driver tpm_tis_i2c_driver = {
.name = "tpm_i2c_infineon",
.owner = THIS_MODULE,
.pm = &tpm_tis_i2c_ops,
.of_match_table = of_match_ptr(tpm_tis_i2c_of_match),
},
};
module_i2c_driver(tpm_tis_i2c_driver);
MODULE_AUTHOR("Peter Huewe <peter.huewe@infineon.com>");
MODULE_DESCRIPTION("TPM TIS I2C Infineon Driver");
MODULE_VERSION("2.1.5");
MODULE_VERSION("2.2.0");
MODULE_LICENSE("GPL");

64
drivers/char/tpm/tpm_i2c_stm_st33.c
View File

@ -36,7 +36,6 @@
#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>
@ -50,7 +49,6 @@
#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 +176,7 @@ 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 +195,12 @@ 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 +217,7 @@ 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 +234,7 @@ 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 +252,7 @@ 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 +276,7 @@ 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 +292,7 @@ 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 +314,7 @@ 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 +331,7 @@ 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 +377,7 @@ 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 +401,7 @@ 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,
@ -433,7 +431,7 @@ 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 +451,7 @@ 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, burstcnt = 0, i, size;
int ret;
u8 data;
struct i2c_client *client;
@ -483,7 +480,7 @@ 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);
size = min_t(int, len - i - 1, burstcnt);
ret = I2C_WRITE_DATA(client, TPM_DATA_FIFO, buf, size);
@ -547,7 +544,7 @@ 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;
@ -569,7 +566,7 @@ out:
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 = {
@ -617,7 +614,7 @@ static struct tpm_vendor_specific st_i2c_tpm = {
.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 +711,7 @@ 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;
}
@ -754,7 +751,7 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
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 +781,7 @@ 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);
@ -823,9 +820,9 @@ static int tpm_st33_i2c_pm_suspend(struct device *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{
} else {
if (chip->data_buffer == NULL)
chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
ret = tpm_pm_suspend(dev);
@ -851,12 +848,12 @@ static int tpm_st33_i2c_pm_resume(struct device *dev)
(chip->vendor.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 {
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);
}
return ret;
} /* tpm_st33_i2c_pm_resume() */
@ -867,7 +864,8 @@ 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,

14
drivers/char/tpm/tpm_ppi.c
View File

@ -158,9 +158,9 @@ static ssize_t tpm_store_ppi_request(struct device *dev,
ACPI_TYPE_STRING);
if (ACPI_FAILURE(status))
return -ENOMEM;
strncpy(version,
strlcpy(version,
((union acpi_object *)output.pointer)->string.pointer,
PPI_VERSION_LEN);
PPI_VERSION_LEN + 1);
kfree(output.pointer);
output.length = ACPI_ALLOCATE_BUFFER;
output.pointer = NULL;
@ -237,9 +237,9 @@ static ssize_t tpm_show_ppi_transition_action(struct device *dev,
ACPI_TYPE_STRING);
if (ACPI_FAILURE(status))
return -ENOMEM;
strncpy(version,
strlcpy(version,
((union acpi_object *)output.pointer)->string.pointer,
PPI_VERSION_LEN);
PPI_VERSION_LEN + 1);
/*
* PPI spec defines params[3].type as empty package, but some platforms
* (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for
@ -351,7 +351,7 @@ cleanup:
static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
{
char *str = buf;
char version[PPI_VERSION_LEN];
char version[PPI_VERSION_LEN + 1];
acpi_handle handle;
acpi_status status;
struct acpi_object_list input;
@ -381,9 +381,9 @@ static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
if (ACPI_FAILURE(status))
return -ENOMEM;
strncpy(version,
strlcpy(version,
((union acpi_object *)output.pointer)->string.pointer,
PPI_VERSION_LEN);
PPI_VERSION_LEN + 1);
kfree(output.pointer);
output.length = ACPI_ALLOCATE_BUFFER;
output.pointer = NULL;