Commit 348a2e8c authored by Prashant Malani's avatar Prashant Malani
Browse files

platform/chrome: cros_ec_typec: Register partner PDOs 



The ChromeOS EC exports partner source/sink cap PDOs (Power Data
Objects) to the application processor (AP). Use this information
to register USB PD (Power Delivery) capabilities with the
USB Type-C Power Delivery device class.

Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: default avatarPrashant Malani <pmalani@chromium.org>
Reviewed-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20220830202018.1884851-1-pmalani@chromium.org
[pmalani: Remove extra newline nit from original patch]
parent 20dfb747

drivers/platform/chrome/cros_ec_typec.c

+55 −0
Original line number Diff line number Diff line
@@ -73,6 +73,11 @@ struct cros_typec_port { 
	struct ec_response_typec_discovery *disc_data;

	struct list_head partner_mode_list;

	struct list_head plug_mode_list;



	/* PDO-related structs */

	struct usb_power_delivery *partner_pd;

	struct usb_power_delivery_capabilities *partner_src_caps;

	struct usb_power_delivery_capabilities *partner_sink_caps;

};



/* Platform-specific data for the Chrome OS EC Type C controller. */
@@ -253,6 +258,14 @@ static void cros_typec_remove_partner(struct cros_typec_data *typec, 


	cros_typec_unregister_altmodes(typec, port_num, true);



	typec_partner_set_usb_power_delivery(port->partner, NULL);

	usb_power_delivery_unregister_capabilities(port->partner_sink_caps);

	port->partner_sink_caps = NULL;

	usb_power_delivery_unregister_capabilities(port->partner_src_caps);

	port->partner_src_caps = NULL;

	usb_power_delivery_unregister(port->partner_pd);

	port->partner_pd = NULL;



	cros_typec_usb_disconnect_state(port);

	port->mux_flags = USB_PD_MUX_NONE;
@@ -939,6 +952,46 @@ static int cros_typec_send_clear_event(struct cros_typec_data *typec, int port_n 
			   sizeof(req), NULL, 0);

}



static void cros_typec_register_partner_pdos(struct cros_typec_data *typec,

					     struct ec_response_typec_status *resp, int port_num)

{

	struct usb_power_delivery_capabilities_desc caps_desc = {};

	struct usb_power_delivery_desc desc = {

		.revision = (le16_to_cpu(resp->sop_revision) & 0xff00) >> 4,

	};

	struct cros_typec_port *port = typec->ports[port_num];



	if (!port->partner || port->partner_pd)

		return;



	/* If no caps are available, don't bother creating a device. */

	if (!resp->source_cap_count && !resp->sink_cap_count)

		return;



	port->partner_pd = usb_power_delivery_register(NULL, &desc);

	if (IS_ERR(port->partner_pd)) {

		dev_warn(typec->dev, "Failed to register partner PD device, port: %d\n", port_num);

		return;

	}



	typec_partner_set_usb_power_delivery(port->partner, port->partner_pd);



	memcpy(caps_desc.pdo, resp->source_cap_pdos, sizeof(u32) * resp->source_cap_count);

	caps_desc.role = TYPEC_SOURCE;

	port->partner_src_caps = usb_power_delivery_register_capabilities(port->partner_pd,

									  &caps_desc);

	if (IS_ERR(port->partner_src_caps))

		dev_warn(typec->dev, "Failed to register source caps, port: %d\n", port_num);



	memset(&caps_desc, 0, sizeof(caps_desc));

	memcpy(caps_desc.pdo, resp->sink_cap_pdos, sizeof(u32) * resp->sink_cap_count);

	caps_desc.role = TYPEC_SINK;

	port->partner_sink_caps = usb_power_delivery_register_capabilities(port->partner_pd,

									   &caps_desc);

	if (IS_ERR(port->partner_sink_caps))

		dev_warn(typec->dev, "Failed to register sink caps, port: %d\n", port_num);

}



static void cros_typec_handle_status(struct cros_typec_data *typec, int port_num)

{

	struct ec_response_typec_status resp;
@@ -986,6 +1039,8 @@ static void cros_typec_handle_status(struct cros_typec_data *typec, int port_num 
		}

		if (resp.sop_connected)

			typec_set_pwr_opmode(typec->ports[port_num]->port, TYPEC_PWR_MODE_PD);



		cros_typec_register_partner_pdos(typec, &resp, port_num);

	}



	if (resp.events & PD_STATUS_EVENT_SOP_PRIME_DISC_DONE &&