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authorStefan Berger2011-03-30 12:13:28 -0400
committerRajiv Andrade2011-07-12 18:53:08 -0300
commit6259210176510c64251a314ffb74834a790f09a0 (patch)
tree41cdcab9da0e98e93f1b30b31d58ca13abd3ca9b /drivers/char
parente3e1a1e169d4e7f73c60ded937ebe24526bc6427 (diff)
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>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/tpm.c16
-rw-r--r--drivers/char/tpm/tpm.h3
-rw-r--r--drivers/char/tpm/tpm_tis.c4
3 files changed, 22 insertions, 1 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 533ae359cb28..873ef50aad90 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -557,6 +557,7 @@ void tpm_get_timeouts(struct tpm_chip *chip)
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 @@ ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
}
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)
{
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 6fc797611ccb..c5e01c556233 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -58,6 +58,8 @@ extern ssize_t tpm_show_temp_deactivated(struct device *,
struct device_attribute *attr, char *);
extern ssize_t tpm_show_durations(struct device *,
struct device_attribute *attr, char *);
+extern ssize_t tpm_show_timeouts(struct device *,
+ struct device_attribute *attr, char *);
struct tpm_chip;
@@ -83,6 +85,7 @@ struct tpm_vendor_specific {
struct list_head list;
int locality;
unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
+ bool timeout_adjusted;
unsigned long duration[3]; /* jiffies */
bool duration_adjusted;
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index e15b30d49543..a84108cd932f 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -377,6 +377,7 @@ static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
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 DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
+static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
static struct attribute *tis_attrs[] = {
&dev_attr_pubek.attr,
@@ -387,7 +388,8 @@ static struct attribute *tis_attrs[] = {
&dev_attr_temp_deactivated.attr,
&dev_attr_caps.attr,
&dev_attr_cancel.attr,
- &dev_attr_durations.attr, NULL,
+ &dev_attr_durations.attr,
+ &dev_attr_timeouts.attr, NULL,
};
static struct attribute_group tis_attr_grp = {