tpm_tis: Add timeouts sysfs entry
Display the TPM's interface timeouts in a 'timeouts' sysfs entry. Display
the entries as having been adjusted when they were scaled due to their values
being reported in milliseconds rather than microseconds.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 533ae35..873ef50 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -557,6 +557,7 @@
if (timeout && timeout < 1000) {
/* timeouts in msec rather usec */
scale = 1000;
+ chip->vendor.timeout_adjusted = true;
}
if (timeout)
chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
@@ -965,6 +966,21 @@
}
EXPORT_SYMBOL_GPL(tpm_show_durations);
+ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d %d %d %d [%s]\n",
+ jiffies_to_usecs(chip->vendor.timeout_a),
+ jiffies_to_usecs(chip->vendor.timeout_b),
+ jiffies_to_usecs(chip->vendor.timeout_c),
+ jiffies_to_usecs(chip->vendor.timeout_d),
+ chip->vendor.timeout_adjusted
+ ? "adjusted" : "original");
+}
+EXPORT_SYMBOL_GPL(tpm_show_timeouts);
+
ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{