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usb: typec: Add sysfs node to show cc orientation

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Export Type-C orientation information when available.
- "normal": CC1 orientation
- "reverse": CC2 orientation
- "unknown": Orientation cannot be determined.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200226195758.150477-1-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Badhri Jagan Sridharan 2020-02-26 11:57:58 -08:00 committed by Greg Kroah-Hartman
parent 24e6aea480
commit 75f81a7ffe
4 changed files with 37 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-class-typec
View File

@ -108,6 +108,15 @@ Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Description:
Revision number of the supported USB Type-C specification.
What: /sys/class/typec/<port>/orientation
Date: February 2020
Contact: Badhri Jagan Sridharan <badhri@google.com>
Description:
Indicates the active orientation of the Type-C connector.
Valid values:
- "normal": CC1 orientation
- "reverse": CC2 orientation
- "unknown": Orientation cannot be determined.
USB Type-C partner devices (eg. /sys/class/typec/port0-partner/)

26
drivers/usb/typec/class.c
View File

@ -1244,6 +1244,25 @@ static ssize_t usb_power_delivery_revision_show(struct device *dev,
}
static DEVICE_ATTR_RO(usb_power_delivery_revision);
static ssize_t orientation_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct typec_port *p = to_typec_port(dev);
enum typec_orientation orientation = typec_get_orientation(p);
switch (orientation) {
case TYPEC_ORIENTATION_NORMAL:
return sprintf(buf, "%s\n", "normal");
case TYPEC_ORIENTATION_REVERSE:
return sprintf(buf, "%s\n", "reverse");
case TYPEC_ORIENTATION_NONE:
default:
return sprintf(buf, "%s\n", "unknown");
}
}
static DEVICE_ATTR_RO(orientation);
static struct attribute *typec_attrs[] = {
&dev_attr_data_role.attr,
&dev_attr_power_operation_mode.attr,
@ -1254,6 +1273,7 @@ static struct attribute *typec_attrs[] = {
&dev_attr_usb_typec_revision.attr,
&dev_attr_vconn_source.attr,
&dev_attr_port_type.attr,
&dev_attr_orientation.attr,
NULL,
};
@ -1283,6 +1303,10 @@ static umode_t typec_attr_is_visible(struct kobject *kobj,
return 0;
if (port->cap->type != TYPEC_PORT_DRP)
return 0444;
} else if (attr == &dev_attr_orientation.attr) {
if (port->cap->orientation_aware)
return 0444;
return 0;
}
return attr->mode;
@ -1493,6 +1517,8 @@ int typec_set_orientation(struct typec_port *port,
}
port->orientation = orientation;
sysfs_notify(&port->dev.kobj, NULL, "orientation");
kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
return 0;
}

1
drivers/usb/typec/tcpm/tcpm.c
View File

@ -4742,6 +4742,7 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
port->typec_caps.pd_revision = 0x0300; /* USB-PD spec release 3.0 */
port->typec_caps.driver_data = port;
port->typec_caps.ops = &tcpm_ops;
port->typec_caps.orientation_aware = 1;
port->partner_desc.identity = &port->partner_ident;
port->port_type = port->typec_caps.type;

1
include/linux/usb/typec.h
View File

@ -211,6 +211,7 @@ struct typec_capability {
u16 pd_revision; /* 0300H = "3.0" */
int prefer_role;
enum typec_accessory accessory[TYPEC_MAX_ACCESSORY];
unsigned int orientation_aware:1;
struct fwnode_handle *fwnode;
void *driver_data;