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-rw-r--r--src/drivers/i2c/tpm/tpm.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/src/drivers/i2c/tpm/tpm.c b/src/drivers/i2c/tpm/tpm.c
index bc36e3587c..dc4ab78149 100644
--- a/src/drivers/i2c/tpm/tpm.c
+++ b/src/drivers/i2c/tpm/tpm.c
@@ -86,13 +86,14 @@ static const char * const chip_name[] = {
/* Structure to store I2C TPM specific stuff */
struct tpm_inf_dev {
- unsigned bus;
+ int bus;
unsigned int addr;
uint8_t buf[TPM_BUFSIZE + sizeof(uint8_t)]; // max. buffer size + addr
enum i2c_chip_type chip_type;
};
static struct tpm_inf_dev tpm_dev = {
+ .bus = -1,
.addr = TPM_I2C_ADDR
};
@@ -115,7 +116,7 @@ static int iic_tpm_read(uint8_t addr, uint8_t *buffer, size_t len)
int rc;
int count;
- if (!tpm_dev.bus)
+ if (tpm_dev.bus < 0)
return -1;
if ((tpm_dev.chip_type == SLB9635) || (tpm_dev.chip_type == UNKNOWN)) {
/* slb9635 protocol should work in both cases */
@@ -186,7 +187,7 @@ static int iic_tpm_write_generic(uint8_t addr, uint8_t *buffer, size_t len,
tpm_dev.buf[0] = addr;
memcpy(&(tpm_dev.buf[1]), buffer, len);
- if (!tpm_dev.bus)
+ if (tpm_dev.bus < 0)
return -1;
for (count = 0; count < max_count; count++) {
rc = i2c_write_raw(tpm_dev.bus, tpm_dev.addr,