linux-kernel - [PATCH 2/2] platform/chrome: typec: Register Type C switches

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Message-Id: <20200422222242.241699-2-pmalani@chromium.org>
Date:   Wed, 22 Apr 2020 15:22:41 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     heikki.krogerus@...ux.intel.com, twawrzynczak@...omium.org,
        Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: [PATCH 2/2] platform/chrome: typec: Register Type C switches

Register Type C mux and switch handles, when provided via firmware
bindings. These will allow the cros-ec-typec driver, and also alternate
mode drivers to configure connected Muxes correctly, according to PD
information retrieved from the Chrome OS EC.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/platform/chrome/cros_ec_typec.c | 47 +++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index eda57db26f8d..324ead297c4d 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -14,6 +14,8 @@
 #include <linux/platform_data/cros_usbpd_notify.h>
 #include <linux/platform_device.h>
 #include <linux/usb/typec.h>
+#include <linux/usb/typec_mux.h>
+#include <linux/usb/role.h>
 
 #define DRV_NAME "cros-ec-typec"
 
@@ -25,6 +27,9 @@ struct cros_typec_port {
 	struct typec_partner *partner;
 	/* Port partner PD identity info. */
 	struct usb_pd_identity p_identity;
+	struct typec_switch *ori_sw;
+	struct typec_mux *mux;
+	struct usb_role_switch *role_sw;
 };
 
 /* Platform-specific data for the Chrome OS EC Type C controller. */
@@ -84,6 +89,40 @@ static int cros_typec_parse_port_props(struct typec_capability *cap,
 	return 0;
 }
 
+static int cros_typec_get_switch_handles(struct cros_typec_port *port,
+					 struct fwnode_handle *fwnode,
+					 struct device *dev)
+{
+	port->mux = fwnode_typec_mux_get(fwnode, NULL);
+	if (IS_ERR(port->mux)) {
+		dev_info(dev, "Mux handle not found.\n");
+		goto mux_err;
+	}
+
+	port->ori_sw = fwnode_typec_switch_get(fwnode);
+	if (IS_ERR(port->ori_sw)) {
+		dev_info(dev, "Orientation switch handle not found.\n");
+		goto ori_sw_err;
+	}
+
+	port->role_sw = fwnode_usb_role_switch_get(fwnode);
+	if (IS_ERR(port->role_sw)) {
+		dev_info(dev, "USB role switch handle not found.\n");
+		goto role_sw_err;
+	}
+
+	return 0;
+
+role_sw_err:
+	usb_role_switch_put(port->role_sw);
+ori_sw_err:
+	typec_switch_put(port->ori_sw);
+mux_err:
+	typec_mux_put(port->mux);
+
+	return -ENODEV;
+}
+
 static void cros_unregister_ports(struct cros_typec_data *typec)
 {
 	int i;
@@ -91,6 +130,9 @@ static void cros_unregister_ports(struct cros_typec_data *typec)
 	for (i = 0; i < typec->num_ports; i++) {
 		if (!typec->ports[i])
 			continue;
+		usb_role_switch_put(typec->ports[i]->role_sw);
+		typec_switch_put(typec->ports[i]->ori_sw);
+		typec_mux_put(typec->ports[i]->mux);
 		typec_unregister_port(typec->ports[i]->port);
 	}
 }
@@ -153,6 +195,11 @@ static int cros_typec_init_ports(struct cros_typec_data *typec)
 			ret = PTR_ERR(cros_port->port);
 			goto unregister_ports;
 		}
+
+		ret = cros_typec_get_switch_handles(cros_port, fwnode, dev);
+		if (ret)
+			dev_info(dev, "No switch control for port %d\n",
+				 port_num);
 	}
 
 	return 0;
-- 
2.26.1.301.g55bc3eb7cb9-goog