From: Tim Wawrzynczak <[email protected]> The new sysfs entry 'uptime' is being made available to userspace so that a userspace daemon can synchronize EC logs with host time.
Signed-off-by: Tim Wawrzynczak <[email protected]> --- Enric, the use case for this is ChromeOS's userspace daemon, timberslide, which collects the EC logs for sending bug reports, etc. This is part of a series of patches which is prefixing host timestamps before each EC log line. The daemon matches up the EC log lines' seconds-since-boot with the time gotten from the new 'uptime' node and calculates the host time that the log line was printed at. --- drivers/platform/chrome/cros_ec_sysfs.c | 34 +++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c index fe0b7614ae1b..b3915d3287c5 100644 --- a/drivers/platform/chrome/cros_ec_sysfs.c +++ b/drivers/platform/chrome/cros_ec_sysfs.c @@ -107,6 +107,38 @@ 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) { @@ -314,12 +346,14 @@ 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, }; -- 2.20.1
