platform/chrome: cros_ec_debugfs: Add debugfs entry to retrieve EC uptime (e90716a6) · Commits · 戴 / test

Documentation/ABI/testing/debugfs-cros-ec

0 → 100644

+8 −0

Original line number	Diff line number	Diff line
		What: /sys/kernel/debug/<cros-ec-device>/uptime
		Date: June 2019
		KernelVersion: 5.3
		Description:
		A u32 providing the time since EC booted in ms. This is
		is used for synchronizing the AP host time with the EC
		log. An error is returned if the command is not supported
		by the EC or there is a communication problem.

drivers/platform/chrome/cros_ec_debugfs.c

+38 −0

Original line number	Diff line number	Diff line
		@@ -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);

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