A PD-capable device can return up to 3 Product Type VDOs as part of its
DiscoverIdentity Response (USB PD Spec, Rev 3.0, Version 2.0, Section
6.4.4.3.1). Add a sysfs attribute to expose these to userspace.
Cc: Benson Leung <ble...@chromium.org>
Cc: Heikki Krogerus <heikki.kroge...@linux.intel.com>
Signed-off-by: Prashant Malani <pmal...@chromium.org>
---
NOTE: I didn't include Benson's Reviewed-by from v1, since this version
introduced the sysfs_notify() call.
Changes in v2:
- Added sysfs_notify() call for the attribute.
- Added description for the attribute in
Documentation/ABI/testing/sysfs-class-typec.
Documentation/ABI/testing/sysfs-class-typec | 17 +++++++++++++++++
drivers/usb/typec/class.c | 11 +++++++++++
2 files changed, 28 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-class-typec
b/Documentation/ABI/testing/sysfs-class-typec
index b834671522d6..16440a236b66 100644
--- a/Documentation/ABI/testing/sysfs-class-typec
+++ b/Documentation/ABI/testing/sysfs-class-typec
@@ -170,6 +170,14 @@ Description:
will show 0 until Discover Identity command result becomes
available. The value can be polled.
+What: /sys/class/typec/<port>-partner/identity/product_type_vdo
+Date: October 2020
+Contact: Prashant Malani <pmal...@chromium.org>
+Description:
+ Product Type VDOs part of Discover Identity command result. 3
values
+ are displayed (for the 3 possible Product Type VDOs), one per
line.
+ The values will show 0s until Discover Identity command result
becomes
+ available. The values can be polled.
USB Type-C cable devices (eg. /sys/class/typec/port0-cable/)
@@ -230,6 +238,15 @@ Description:
will show 0 until Discover Identity command result becomes
available. The value can be polled.
+What: /sys/class/typec/<port>-cable/identity/product_type_vdo
+Date: October 2020
+Contact: Prashant Malani <pmal...@chromium.org>
+Description:
+ Product Type VDOs part of Discover Identity command result. 3
values
+ are displayed (for the 3 possible Product Type VDOs), one per
line.
+ The values will show 0s until Discover Identity command result
becomes
+ available. The values can be polled.
+
USB Type-C port alternate mode devices.
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 35eec707cb51..37fa4501e75f 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -122,10 +122,20 @@ static ssize_t product_show(struct device *dev, struct
device_attribute *attr,
}
static DEVICE_ATTR_RO(product);
+static ssize_t product_type_vdo_show(struct device *dev, struct
device_attribute *attr,
+ char *buf)
+{
+ struct usb_pd_identity *id = get_pd_identity(dev);
+
+ return sprintf(buf, "0x%08x\n0x%08x\n0x%08x\n", id->vdo[0], id->vdo[1],
id->vdo[2]);
+}
+static DEVICE_ATTR_RO(product_type_vdo);
+
static struct attribute *usb_pd_id_attrs[] = {
&dev_attr_id_header.attr,
&dev_attr_cert_stat.attr,
&dev_attr_product.attr,
+ &dev_attr_product_type_vdo.attr,
NULL
};
@@ -144,6 +154,7 @@ static void typec_report_identity(struct device *dev)
sysfs_notify(&dev->kobj, "identity", "id_header");
sysfs_notify(&dev->kobj, "identity", "cert_stat");
sysfs_notify(&dev->kobj, "identity", "product");
+ sysfs_notify(&dev->kobj, "identity", "product_type_vdo");
}
/* ------------------------------------------------------------------------- */
--
2.29.0.rc1.297.gfa9743e501-goog
