linux-kernel - [RFC 3/3] platform/chrome: typec: Update port info from EC

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Message-Id: <20200130220032.160855-4-pmalani@chromium.org>
Date:   Thu, 30 Jan 2020 14:00:33 -0800
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     heikki.krogerus@...el.com, enric.balletbo@...labora.com,
        bleung@...omium.org, Prashant Malani <pmalani@...omium.org>,
        Jon Flatley <jflat@...omium.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: [RFC 3/3] platform/chrome: typec: Update port info from EC

After registering the ports at probe, get the current port information
from EC and update the Type C connector class ports accordingly.

Co-developed-by: Jon Flatley <jflat@...omium.org>
Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/platform/chrome/cros_ec_typec.c | 90 ++++++++++++++++++++++++-
 1 file changed, 89 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 189c2192375c5d..a9160a5734a489 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -27,6 +27,82 @@ struct cros_typec_data {
 	struct typec_port *ports[EC_USB_PD_MAX_PORTS];
 };
 
+static void cros_typec_set_port_params_v0(struct cros_typec_data *typec,
+		int port_num, struct ec_response_usb_pd_control *resp)
+{
+	struct typec_port *port = typec->ports[port_num];
+	enum typec_orientation polarity;
+
+	if (!resp->enabled)
+		polarity = TYPEC_ORIENTATION_NONE;
+	else if (!resp->polarity)
+		polarity = TYPEC_ORIENTATION_NORMAL;
+	else
+		polarity = TYPEC_ORIENTATION_REVERSE;
+
+	typec_set_pwr_role(port, resp->role ? TYPEC_SOURCE : TYPEC_SINK);
+	typec_set_orientation(port, polarity);
+}
+
+
+static void cros_typec_set_port_params_v1(struct cros_typec_data *typec,
+		int port_num, struct ec_response_usb_pd_control_v1 *resp)
+{
+	struct typec_port *port = typec->ports[port_num];
+	enum typec_orientation polarity;
+
+	if (!(resp->enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
+		polarity = TYPEC_ORIENTATION_NONE;
+	else if (!resp->polarity)
+		polarity = TYPEC_ORIENTATION_NORMAL;
+	else
+		polarity = TYPEC_ORIENTATION_REVERSE;
+	typec_set_orientation(port, polarity);
+	typec_set_data_role(port, resp->role & PD_CTRL_RESP_ROLE_DATA ?
+			TYPEC_HOST : TYPEC_DEVICE);
+	typec_set_pwr_role(port, resp->role & PD_CTRL_RESP_ROLE_POWER ?
+			TYPEC_SOURCE : TYPEC_SINK);
+	typec_set_vconn_role(port, resp->role & PD_CTRL_RESP_ROLE_VCONN ?
+			TYPEC_SOURCE : TYPEC_SINK);
+}
+
+static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
+{
+	struct ec_params_usb_pd_control req;
+	struct ec_response_usb_pd_control_v1 resp;
+	int ret;
+
+	if (port_num < 0 || port_num >= typec->num_ports) {
+		dev_err(typec->dev, "cannot get status for invalid port %d\n",
+				port_num);
+		return -EINVAL;
+	}
+
+	req.port = port_num;
+	req.role = USB_PD_CTRL_ROLE_NO_CHANGE;
+	req.mux = USB_PD_CTRL_MUX_NO_CHANGE;
+	req.swap = USB_PD_CTRL_SWAP_NONE;
+
+	ret = cros_ec_send_cmd_msg(typec->ec, typec->cmd_ver,
+			EC_CMD_USB_PD_CONTROL,
+			&req, sizeof(req), &resp, sizeof(resp));
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(typec->dev, "Enabled %d: 0x%hhx\n", port_num, resp.enabled);
+	dev_dbg(typec->dev, "Role %d: 0x%hhx\n", port_num, resp.role);
+	dev_dbg(typec->dev, "Polarity %d: 0x%hhx\n", port_num, resp.polarity);
+	dev_dbg(typec->dev, "State %d: %s\n", port_num, resp.state);
+
+	if (typec->cmd_ver == 1)
+		cros_typec_set_port_params_v1(typec, port_num, &resp);
+	else
+		cros_typec_set_port_params_v0(typec, port_num,
+			(struct ec_response_usb_pd_control *) &resp);
+
+	return 0;
+}
+
 void cros_typec_parse_port_props(struct typec_capability *cap,
 				 const struct fwnode_handle *fwnode,
 				 struct device *dev)
@@ -168,7 +244,7 @@ static int cros_typec_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct cros_typec_data *typec;
-	int ret;
+	int ret, i;
 
 	typec = devm_kzalloc(dev, sizeof(*typec), GFP_KERNEL);
 	if (!typec)
@@ -197,7 +273,19 @@ static int cros_typec_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
+	for (i = 0; i < typec->num_ports; i++) {
+		ret = cros_typec_port_update(typec, i);
+		if (ret < 0)
+			goto unregister_ports;
+	}
+
 	return 0;
+
+unregister_ports:
+	for (i = 0; i < typec->num_ports; i++)
+		if (typec->ports[i])
+			typec_unregister_port(typec->ports[i]);
+	return ret;
 }
 
 #ifdef CONFIG_ACPI
-- 
2.25.0.341.g760bfbb309-goog