linux-kernel - [PATCH] usb: typec: Add sysfs node to show cc orientation

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Message-Id: <20191016034314.231363-1-pumahsu@google.com>
Date:   Wed, 16 Oct 2019 11:43:14 +0800
From:   pumahsu <pumahsu@...gle.com>
To:     heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org
Cc:     badhri@...gle.com, kyletso@...gle.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, pumahsu <pumahsu@...gle.com>
Subject: [PATCH] usb: typec: Add sysfs node to show cc orientation

Export the Type-C cc orientation so that user space can
get this information.

Signed-off-by: pumahsu <pumahsu@...gle.com>
---
 Documentation/ABI/testing/sysfs-class-typec |  7 +++++++
 drivers/usb/typec/class.c                   | 11 +++++++++++
 2 files changed, 18 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec
index d7647b258c3c..419f952c991d 100644
--- a/Documentation/ABI/testing/sysfs-class-typec
+++ b/Documentation/ABI/testing/sysfs-class-typec
@@ -108,6 +108,13 @@ Contact:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
 Description:
 		Revision number of the supported USB Type-C specification.
 
+What:		/sys/class/typec/<port>/cc_orientation
+Date:		September 2019
+Contact:	Puma Hsu <pumahsu@...gle.com>
+Description:
+		Indicates which cc orientation is active now, or 0 when
+		nothing is connected.
+
 
 USB Type-C partner devices (eg. /sys/class/typec/port0-partner/)
 
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 7d8805d9bf37..00edae63da8e 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -1238,6 +1238,16 @@ static ssize_t usb_power_delivery_revision_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(usb_power_delivery_revision);
 
+static ssize_t cc_orientation_show(struct device *dev,
+						struct device_attribute *attr,
+						char *buf)
+{
+	struct typec_port *p = to_typec_port(dev);
+
+	return sprintf(buf, "%d\n", typec_get_orientation(p));
+}
+static DEVICE_ATTR_RO(cc_orientation);
+
 static struct attribute *typec_attrs[] = {
 	&dev_attr_data_role.attr,
 	&dev_attr_power_operation_mode.attr,
@@ -1248,6 +1258,7 @@ static struct attribute *typec_attrs[] = {
 	&dev_attr_usb_typec_revision.attr,
 	&dev_attr_vconn_source.attr,
 	&dev_attr_port_type.attr,
+	&dev_attr_cc_orientation.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(typec);
-- 
2.23.0.700.g56cf767bdb-goog