Commit e6a3215f authored by Andrei Kuchynski's avatar Andrei Kuchynski Committed by Tzung-Bi Shih
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platform/chrome: cros_ec_sysfs: Expose PD mux status 



This adds sysfs attribute /sys/class/chromeos/cros_ec/usbpdmuxinfo
to expose the PD mux status for each Type-C port.
This allows user-space applications to easily determine
the current mux state without using ioctls.

Signed-off-by: default avatarAndrei Kuchynski <akuchynski@chromium.org>
Link: https://lore.kernel.org/r/20250203125947.2701106-2-akuchynski@chromium.org


Signed-off-by: default avatarTzung-Bi Shih <tzungbi@kernel.org>
parent d83c45ae

Documentation/ABI/testing/sysfs-class-chromeos

+13 −0
Original line number Diff line number Diff line
@@ -31,3 +31,16 @@ Date: August 2015 
KernelVersion:	4.2

Description:

		Show the information about the EC software and hardware.



What:		/sys/class/chromeos/cros_ec/usbpdmuxinfo

Date:		February 2025

Description:

		Show PD mux status for each typec port with following flags:

		- "USB": USB connected

		- "DP": DP connected

		- "POLARITY": CC line Polarity inverted

		- "HPD_IRQ": Hot Plug Detect interrupt is asserted

		- "HPD_LVL": Hot Plug Detect level is asserted

		- "SAFE": DP is in safe mode

		- "TBT": TBT enabled

		- "USB4": USB4 enabled

drivers/platform/chrome/cros_ec_sysfs.c

+58 −0
Original line number Diff line number Diff line
@@ -296,18 +296,69 @@ static ssize_t kb_wake_angle_store(struct device *dev, 
	return count;

}



static ssize_t usbpdmuxinfo_show(struct device *dev,

				   struct device_attribute *attr,

				   char *buf)

{

	struct cros_ec_dev *ec = to_cros_ec_dev(dev);

	ssize_t count = 0;

	struct ec_response_usb_pd_ports resp_pd_ports;

	int ret;

	int i;



	ret = cros_ec_cmd(ec->ec_dev, 0, EC_CMD_USB_PD_PORTS, NULL, 0,

			  &resp_pd_ports, sizeof(resp_pd_ports));

	if (ret < 0)

		return -EIO;



	for (i = 0; i < resp_pd_ports.num_ports; i++) {

		struct ec_response_usb_pd_mux_info resp_mux;

		struct ec_params_usb_pd_mux_info req = {

			.port = i,

		};



		ret = cros_ec_cmd(ec->ec_dev, 0, EC_CMD_USB_PD_MUX_INFO,

			  &req, sizeof(req), &resp_mux, sizeof(resp_mux));



		if (ret >= 0) {

			count += sysfs_emit_at(buf, count, "Port %d:", i);

			count += sysfs_emit_at(buf, count, " USB=%d",

					!!(resp_mux.flags & USB_PD_MUX_USB_ENABLED));

			count += sysfs_emit_at(buf, count, " DP=%d",

					!!(resp_mux.flags & USB_PD_MUX_DP_ENABLED));

			count += sysfs_emit_at(buf, count, " POLARITY=%s",

					(resp_mux.flags & USB_PD_MUX_POLARITY_INVERTED) ?

					"INVERTED" : "NORMAL");

			count += sysfs_emit_at(buf, count, " HPD_IRQ=%d",

					!!(resp_mux.flags & USB_PD_MUX_HPD_IRQ));

			count += sysfs_emit_at(buf, count, " HPD_LVL=%d",

					!!(resp_mux.flags & USB_PD_MUX_HPD_LVL));

			count += sysfs_emit_at(buf, count, " SAFE=%d",

					!!(resp_mux.flags & USB_PD_MUX_SAFE_MODE));

			count += sysfs_emit_at(buf, count, " TBT=%d",

					!!(resp_mux.flags & USB_PD_MUX_TBT_COMPAT_ENABLED));

			count += sysfs_emit_at(buf, count, " USB4=%d\n",

					!!(resp_mux.flags & USB_PD_MUX_USB4_ENABLED));

		}

	}



	return count ? : -EIO;

}



/* Module initialization */



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(usbpdmuxinfo);



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_usbpdmuxinfo.attr,

	NULL,

};
@@ -320,6 +371,13 @@ static umode_t cros_ec_ctrl_visible(struct kobject *kobj, 
	if (a == &dev_attr_kb_wake_angle.attr && !ec->has_kb_wake_angle)

		return 0;



	if (a == &dev_attr_usbpdmuxinfo.attr) {

		struct cros_ec_platform *ec_platform = dev_get_platdata(ec->dev);



		if (strcmp(ec_platform->ec_name, CROS_EC_DEV_NAME))

			return 0;

	}



	return a->mode;

}