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Subject[PATCH] platform/chrome: mfd/cros_ec_sysfs: Add sysfs entry to retrieve EC uptime.
Date
Adds a new sysfs node under the cros_ec device which contains the uptime
of the EC in milliseconds since boot.

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
---
drivers/platform/chrome/cros_ec_sysfs.c | 34 +++++++++++++++++++++++++
include/linux/mfd/cros_ec_commands.h | 15 +++++++++++
2 files changed, 49 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c
index 5a6db3fe213a..7e5ca1e2900b 100644
--- a/drivers/platform/chrome/cros_ec_sysfs.c
+++ b/drivers/platform/chrome/cros_ec_sysfs.c
@@ -123,6 +123,38 @@ static ssize_t reboot_store(struct device *dev,
return count;
}

+static ssize_t uptime_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ec_response_uptime_info *resp;
+ struct cros_ec_command *msg;
+ int ret;
+ struct cros_ec_dev *ec = to_cros_ec_dev(dev);
+ u32 time_since_ec_boot_ms;
+
+ msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ /* Get EC uptime information */
+ msg->version = 0;
+ msg->command = EC_CMD_GET_UPTIME_INFO + ec->cmd_offset;
+ msg->insize = sizeof(*resp);
+ msg->outsize = 0;
+ ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+ if (ret < 0) {
+ time_since_ec_boot_ms = 0;
+ } else {
+ resp = (struct ec_response_uptime_info *)msg->data;
+ time_since_ec_boot_ms = resp->time_since_ec_boot_ms;
+ }
+
+ ret = scnprintf(buf, PAGE_SIZE, "%u\n", time_since_ec_boot_ms);
+
+ kfree(msg);
+ return ret;
+}
+
static ssize_t version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -330,12 +362,14 @@ static DEVICE_ATTR_RW(reboot);
static DEVICE_ATTR_RO(version);
static DEVICE_ATTR_RO(flashinfo);
static DEVICE_ATTR_RW(kb_wake_angle);
+static DEVICE_ATTR_RO(uptime);

static struct attribute *__ec_attrs[] = {
&dev_attr_kb_wake_angle.attr,
&dev_attr_reboot.attr,
&dev_attr_version.attr,
&dev_attr_flashinfo.attr,
+ &dev_attr_uptime.attr,
NULL,
};

diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index a8c882b5c222..38e7e6dcca97 100644
--- a/include/linux/mfd/cros_ec_commands.h
+++ b/include/linux/mfd/cros_ec_commands.h
@@ -4697,6 +4697,21 @@ struct __ec_align4 ec_params_rwsig_action {
uint32_t action;
};

+/* For getting EC uptime & AP reset information */
+#define EC_CMD_GET_UPTIME_INFO 0x0121
+
+struct __ec_align4 ec_response_uptime_info {
+ uint32_t time_since_ec_boot_ms; /* uptime in ms */
+ uint32_t ap_resets_since_ec_boot; /* AP resets recorded by EC */
+ uint32_t ec_reset_flags; /* RESET_* flags */
+ /* Empty log entries have cause and timestamp set to zero */
+ struct ap_reset_log_entry {
+ uint16_t reset_cause; /* enum chipset_*_reason */
+ uint16_t reserved; /* reserved for protocol growth */
+ uint32_t reset_time_ms; /* time of reset assertion */
+ } recent_ap_reset[4];
+};
+
/*****************************************************************************/
/* The command range 0x200-0x2FF is reserved for Rotor. */

--
2.20.1
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