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authorGwendal Grignou <gwendal@chromium.org>2020-05-26 20:53:28 +0200
committerEnric Balletbo i Serra <enric.balletbo@collabora.com>2020-06-19 19:16:18 +0200
commitd378cdd0113878e3860f954d16dd3e91defb1492 (patch)
treeb3d846bb6e27a9fca41ac413e712bce23603d581 /drivers/platform/chrome
parentLinux 5.8-rc1 (diff)
downloadlinux-d378cdd0113878e3860f954d16dd3e91defb1492.tar.xz
linux-d378cdd0113878e3860f954d16dd3e91defb1492.zip
platform/chrome: cros_ec_debugfs: Control uptime information request
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> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Diffstat (limited to 'drivers/platform/chrome')
-rw-r--r--drivers/platform/chrome/cros_ec_debugfs.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
index ecfada00e6c5..272c89837d74 100644
--- a/drivers/platform/chrome/cros_ec_debugfs.c
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -242,6 +242,25 @@ 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)
{
@@ -444,8 +463,9 @@ 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);