platform/chrome: cros_ec_typec: Add support for setting USB mode via sysfs

This patch implements USB mode setting via a sysfs interface in
cros_ec_typec driver. User-space applications can now change the current
USB mode by writing to "usb_mode" sysfs entry, replacing the previous
ioctl-based method.
The embedded controller (EC) currently supports only entering USB4 mode
and exiting all modes (including altmodes). Both of these operations
trigger Data Reset Message, even if no USB Mode is active.
Additionally, the patch exposes the USB modes supported by the port via
"usb_capability" sysfs attribute.

Signed-off-by: Andrei Kuchynski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Tzung-Bi Shih <[e-mail]>

drivers/platform/chrome/cros_ec_typec.c

···
 #endif
 }
 
+static int cros_typec_enter_usb_mode(struct typec_port *tc_port, enum usb_mode mode)
+{
+	struct cros_typec_port *port = typec_get_drvdata(tc_port);
+	struct ec_params_typec_control req = {
+		.port = port->port_num,
+		.command = (mode == USB_MODE_USB4) ?
+			TYPEC_CONTROL_COMMAND_ENTER_MODE : TYPEC_CONTROL_COMMAND_EXIT_MODES,
+		.mode_to_enter = CROS_EC_ALTMODE_USB4
+	};
+
+	return cros_ec_cmd(port->typec_data->ec, 0, EC_CMD_TYPEC_CONTROL,
+			  &req, sizeof(req), NULL, 0);
+}
+
+static const struct typec_operations cros_typec_usb_mode_ops = {
+	.enter_usb_mode = cros_typec_enter_usb_mode
+};
+
 static int cros_typec_parse_port_props(struct typec_capability *cap,
 				       struct fwnode_handle *fwnode,
 				       struct device *dev)
···
 			return ret;
 		cap->prefer_role = ret;
 	}
+
+	if (fwnode_property_present(fwnode, "usb2-port"))
+		cap->usb_capability |= USB_CAPABILITY_USB2;
+	if (fwnode_property_present(fwnode, "usb3-port"))
+		cap->usb_capability |= USB_CAPABILITY_USB3;
+	if (fwnode_property_present(fwnode, "usb4-port"))
+		cap->usb_capability |= USB_CAPABILITY_USB4;
 
 	cros_typec_role_switch_quirk(fwnode);
 
···
 		ret = cros_typec_parse_port_props(cap, fwnode, dev);
 		if (ret < 0)
 			goto unregister_ports;
+
+		cap->driver_data = cros_port;
+		cap->ops = &cros_typec_usb_mode_ops;
 
 		cros_port->port = typec_register_port(dev, cap);
 		if (IS_ERR(cros_port->port)) {

drivers/platform/chrome/cros_ec_typec.h

···
 enum {
 	CROS_EC_ALTMODE_DP = 0,
 	CROS_EC_ALTMODE_TBT,
+	CROS_EC_ALTMODE_USB4,
 	CROS_EC_ALTMODE_MAX,
 };