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platform/chrome: cros_ec_debugfs: Add debugfs entry to retrieve EC uptime

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The new debugfs 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 <twawrzynczak@chromium.org>
[rework based on Tim's first approach]
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Tested-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
This commit is contained in:
Tim Wawrzynczak
2019-06-13 11:57:36 -06:00
committed by Enric Balletbo i Serra
parent 74e80d81cc
commit e90716a661
2 changed files with 46 additions and 0 deletions
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38
drivers/platform/chrome/cros_ec_debugfs.c
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@@ -241,6 +241,34 @@ static ssize_t cros_ec_pdinfo_read(struct file *file,
read_buf, p - read_buf);
}
static ssize_t cros_ec_uptime_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct cros_ec_debugfs *debug_info = file->private_data;
struct cros_ec_device *ec_dev = debug_info->ec->ec_dev;
struct {
struct cros_ec_command cmd;
struct ec_response_uptime_info resp;
} __packed msg = {};
struct ec_response_uptime_info *resp;
char read_buf[32];
int ret;
resp = (struct ec_response_uptime_info *)&msg.resp;
msg.cmd.command = EC_CMD_GET_UPTIME_INFO;
msg.cmd.insize = sizeof(*resp);
ret = cros_ec_cmd_xfer_status(ec_dev, &msg.cmd);
if (ret < 0)
return ret;
ret = scnprintf(read_buf, sizeof(read_buf), "%u\n",
resp->time_since_ec_boot_ms);
return simple_read_from_buffer(user_buf, count, ppos, read_buf, ret);
}
static const struct file_operations cros_ec_console_log_fops = {
.owner = THIS_MODULE,
.open = cros_ec_console_log_open,
@@ -257,6 +285,13 @@ static const struct file_operations cros_ec_pdinfo_fops = {
.llseek = default_llseek,
};
const struct file_operations cros_ec_uptime_fops = {
.owner = THIS_MODULE,
.open = simple_open,
.read = cros_ec_uptime_read,
.llseek = default_llseek,
};
static int ec_read_version_supported(struct cros_ec_dev *ec)
{
struct ec_params_get_cmd_versions_v1 *params;
@@ -408,6 +443,9 @@ static int cros_ec_debugfs_probe(struct platform_device *pd)
debugfs_create_file("pdinfo", 0444, debug_info->dir, debug_info,
&cros_ec_pdinfo_fops);
debugfs_create_file("uptime", 0444, debug_info->dir, debug_info,
&cros_ec_uptime_fops);
ec->debug_info = debug_info;
dev_set_drvdata(&pd->dev, ec);