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Date: Tue,  5 Mar 2024 02:58:02 +0000
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Subject: [PATCH v4 2/4] usb: typec: ucsi: Register cables based on GET_CABLE_PROPERTY
From: Jameson Thies <jthies@google.com>
To: heikki.krogerus@linux.intel.com, linux-usb@vger.kernel.org
Cc: jthies@google.com, pmalani@chromium.org, bleung@google.com, 
	abhishekpandit@chromium.org, andersson@kernel.org, 
	dmitry.baryshkov@linaro.org, fabrice.gasnier@foss.st.com, 
	gregkh@linuxfoundation.org, hdegoede@redhat.com, neil.armstrong@linaro.org, 
	rajaram.regupathy@intel.com, saranya.gopal@intel.com, 
	linux-kernel@vger.kernel.org, Benson Leung <bleung@chromium.org>
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Register cables with the Type-C Connector Class in the UCSI driver based
on the PPM response to GET_CABLE_PROPERTY. Registered cable properties
include plug type, cable type and major revision.

Reviewed-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Jameson Thies <jthies@google.com>
---
Expected cable properties populate the USB Type-C connector class sysfs
paths:
nospike-rev4 /sys/class/typec # ls port0-cable
device  identity  plug_type  port0-plug0  power  subsystem  type  uevent
usb_power_delivery_revision

Changes in v4:
- None.

Changes in v3:
- None.

Changes in v2:
- Shortened lines to within 80 characters.
- Tested on usb-testing branch merged with chromeOS 6.8-rc2 kernel.

 drivers/usb/typec/ucsi/ucsi.c | 73 +++++++++++++++++++++++++++++++++++
 drivers/usb/typec/ucsi/ucsi.h |  5 +++
 2 files changed, 78 insertions(+)

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index ae105383e69e7..7c84687b5d1a3 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -734,6 +734,52 @@ static void ucsi_unregister_partner_pdos(struct ucsi_connector *con)
 	con->partner_pd = NULL;
 }
 
+static int ucsi_register_cable(struct ucsi_connector *con)
+{
+	struct typec_cable *cable;
+	struct typec_cable_desc desc = {};
+
+	switch (UCSI_CABLE_PROP_FLAG_PLUG_TYPE(con->cable_prop.flags)) {
+	case UCSI_CABLE_PROPERTY_PLUG_TYPE_A:
+		desc.type = USB_PLUG_TYPE_A;
+		break;
+	case UCSI_CABLE_PROPERTY_PLUG_TYPE_B:
+		desc.type = USB_PLUG_TYPE_B;
+		break;
+	case UCSI_CABLE_PROPERTY_PLUG_TYPE_C:
+		desc.type = USB_PLUG_TYPE_C;
+		break;
+	default:
+		desc.type = USB_PLUG_NONE;
+		break;
+	}
+
+	desc.active = !!(UCSI_CABLE_PROP_FLAG_ACTIVE_CABLE &
+			 con->cable_prop.flags);
+	desc.pd_revision = UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV_AS_BCD(
+	    con->cable_prop.flags);
+
+	cable = typec_register_cable(con->port, &desc);
+	if (IS_ERR(cable)) {
+		dev_err(con->ucsi->dev,
+			"con%d: failed to register cable (%ld)\n", con->num,
+			PTR_ERR(cable));
+		return PTR_ERR(cable);
+	}
+
+	con->cable = cable;
+	return 0;
+}
+
+static void ucsi_unregister_cable(struct ucsi_connector *con)
+{
+	if (!con->cable)
+		return;
+
+	typec_unregister_cable(con->cable);
+	con->cable = NULL;
+}
+
 static void ucsi_pwr_opmode_change(struct ucsi_connector *con)
 {
 	switch (UCSI_CONSTAT_PWR_OPMODE(con->status.flags)) {
@@ -807,6 +853,7 @@ static void ucsi_unregister_partner(struct ucsi_connector *con)
 	typec_partner_set_usb_power_delivery(con->partner, NULL);
 	ucsi_unregister_partner_pdos(con);
 	ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP);
+	ucsi_unregister_cable(con);
 	typec_unregister_partner(con->partner);
 	con->partner = NULL;
 }
@@ -907,6 +954,30 @@ static int ucsi_check_connection(struct ucsi_connector *con)
 	return 0;
 }
 
+static int ucsi_check_cable(struct ucsi_connector *con)
+{
+	u64 command;
+	int ret;
+
+	if (con->cable)
+		return 0;
+
+	command = UCSI_GET_CABLE_PROPERTY | UCSI_CONNECTOR_NUMBER(con->num);
+	ret = ucsi_send_command(con->ucsi, command, &con->cable_prop,
+				sizeof(con->cable_prop));
+	if (ret < 0) {
+		dev_err(con->ucsi->dev, "GET_CABLE_PROPERTY failed (%d)\n",
+			ret);
+		return ret;
+	}
+
+	ret = ucsi_register_cable(con);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
 static void ucsi_handle_connector_change(struct work_struct *work)
 {
 	struct ucsi_connector *con = container_of(work, struct ucsi_connector,
@@ -948,6 +1019,7 @@ static void ucsi_handle_connector_change(struct work_struct *work)
 			ucsi_register_partner(con);
 			ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
 			ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
+			ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
 
 			if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
 			    UCSI_CONSTAT_PWR_OPMODE_PD)
@@ -1346,6 +1418,7 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
 		ucsi_register_partner(con);
 		ucsi_pwr_opmode_change(con);
 		ucsi_port_psy_changed(con);
+		ucsi_check_cable(con);
 	}
 
 	/* Only notify USB controller if partner supports USB data */
diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
index 469a2baf472e4..f0aabef0b7c64 100644
--- a/drivers/usb/typec/ucsi/ucsi.h
+++ b/drivers/usb/typec/ucsi/ucsi.h
@@ -265,6 +265,9 @@ struct ucsi_cable_property {
 #define   UCSI_CABLE_PROPERTY_PLUG_TYPE_C	2
 #define   UCSI_CABLE_PROPERTY_PLUG_OTHER	3
 #define UCSI_CABLE_PROP_FLAG_MODE_SUPPORT	BIT(5)
+#define UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV(_f_)	(((_f_) & GENMASK(7, 6)) >> 6)
+#define UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV_AS_BCD(_f_) \
+	UCSI_SPEC_REVISION_TO_BCD(UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV(_f_))
 	u8 latency;
 } __packed;
 
@@ -400,6 +403,7 @@ struct ucsi_connector {
 
 	struct typec_port *port;
 	struct typec_partner *partner;
+	struct typec_cable *cable;
 
 	struct typec_altmode *port_altmode[UCSI_MAX_ALTMODES];
 	struct typec_altmode *partner_altmode[UCSI_MAX_ALTMODES];
@@ -408,6 +412,7 @@ struct ucsi_connector {
 
 	struct ucsi_connector_status status;
 	struct ucsi_connector_capability cap;
+	struct ucsi_cable_property cable_prop;
 	struct power_supply *psy;
 	struct power_supply_desc psy_desc;
 	u32 rdo;
-- 
2.44.0.rc1.240.g4c46232300-goog