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Subject[PATCH v2] platform: cros_ec_debugfs: control uptime information request
Date
When EC does not support uptime command (EC_CMD_GET_UPTIME_INFO),
do not create the uptime sysfs entry point.
User space application will not probe the file needlessly.

The EC console log will not contain EC_CMD_GET_UPTIME_INFO anymore.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
drivers/platform/chrome/cros_ec_debugfs.c | 24 +++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
index 6ae484989d1f5..303a8c4686f89 100644
--- a/drivers/platform/chrome/cros_ec_debugfs.c
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -243,6 +243,25 @@ static ssize_t cros_ec_pdinfo_read(struct file *file,
read_buf, p - read_buf);
}

+static bool cros_ec_uptime_is_supported(struct cros_ec_device *ec_dev)
+{
+ struct {
+ struct cros_ec_command cmd;
+ struct ec_response_uptime_info resp;
+ } __packed msg = {};
+ int ret;
+
+ msg.cmd.command = EC_CMD_GET_UPTIME_INFO;
+ msg.cmd.insize = sizeof(msg.resp);
+
+ ret = cros_ec_cmd_xfer_status(ec_dev, &msg.cmd);
+ if (ret == -EPROTO && msg.cmd.result == EC_RES_INVALID_COMMAND)
+ return false;
+
+ /* Other errors maybe a transient error, do not rule about support. */
+ return true;
+}
+
static ssize_t cros_ec_uptime_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
@@ -445,8 +464,9 @@ 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);
+ if (cros_ec_uptime_is_supported(ec->ec_dev))
+ debugfs_create_file("uptime", 0444, debug_info->dir, debug_info,
+ &cros_ec_uptime_fops);

debugfs_create_x32("last_resume_result", 0444, debug_info->dir,
&ec->ec_dev->last_resume_result);
--
2.27.0.rc0.183.gde8f92d652-goog
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