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SubjectRe: [PATCH v4] usb: typec: Add sysfs node to show cc orientation
On Wed, Feb 26, 2020 at 11:57:58AM -0800, Badhri Jagan Sridharan wrote:
> 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>

> ---
> Version history:
> V4:
> - Greg's suggestion of Minor refractor to handle
> TYPEC_ORIENTATION_NONE and default in the same case.
> V3:
> - Heikki's suggestion to us .is_visible callback.
> unsigned int orientation_aware:1 has been introduced to
> make support of this attribute optional for drivers such
> as UCSI
> - Guenter's suggestion to rename to "orientation".
> - Heikki's suggestion to stick with string values instead
> of exposing it as integer values.
> ---
> Documentation/ABI/testing/sysfs-class-typec | 9 +++++++
> drivers/usb/typec/class.c | 26 +++++++++++++++++++++
> drivers/usb/typec/tcpm/tcpm.c | 1 +
> include/linux/usb/typec.h | 1 +
> 4 files changed, 37 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec
> index 0c2eb26fdc06b..b834671522d6f 100644
> --- a/Documentation/ABI/testing/sysfs-class-typec
> +++ b/Documentation/ABI/testing/sysfs-class-typec
> @@ -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/)
>
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 12be5bb6d32ca..bf97c31d0bba1 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -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;
> }
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 78077c234ef27..bc0032a6b9a14 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -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;
> diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
> index 44d28387ced48..b00a2642a9cd6 100644
> --- a/include/linux/usb/typec.h
> +++ b/include/linux/usb/typec.h
> @@ -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;
> --
> 2.25.0.265.gbab2e86ba0-goog

thanks,

--
heikki

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