Re: [PATCH V2] usb: typec: Add sysfs node to show connector orientation

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

+Guenter

On Tue, Oct 22, 2019 at 04:59:24PM +0800, Puma Hsu wrote:
> Export the Type-C connector orientation so that user space
> can get this information.
> 
> Signed-off-by: Puma Hsu <pumahsu@google.com>
> ---
>  Documentation/ABI/testing/sysfs-class-typec | 11 +++++++++++
>  drivers/usb/typec/class.c                   | 18 ++++++++++++++++++
>  2 files changed, 29 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec
> index d7647b258c3c..b22f71801671 100644
> --- a/Documentation/ABI/testing/sysfs-class-typec
> +++ b/Documentation/ABI/testing/sysfs-class-typec
> @@ -108,6 +108,17 @@ Contact:	Heikki Krogerus <heikki.krogerus@linux.intel.com>
>  Description:
>  		Revision number of the supported USB Type-C specification.
>  
> +What:		/sys/class/typec/<port>/connector_orientation
> +Date:		October 2019
> +Contact:	Puma Hsu <pumahsu@google.com>
> +Description:
> +		Indicates which typec connector orientation is configured now.
> +		cc1 is defined as "normal" and cc2 is defined as "reversed".
> +
> +		Valid value:
> +		- unknown (nothing configured)

"unknown" means we do not know the orientation.

> +		- normal (configured in cc1 side)
> +		- reversed (configured in cc2 side)

Guenter, do you think "connector_orientation" OK. I proposed it, but
I'm now wondering if something like "polarity" would be better?

>  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 94a3eda62add..911d06676aeb 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -1245,6 +1245,23 @@ static ssize_t usb_power_delivery_revision_show(struct device *dev,
>  }
>  static DEVICE_ATTR_RO(usb_power_delivery_revision);
>  
> +static const char * const typec_connector_orientation[] = {
> +	[TYPEC_ORIENTATION_NONE]		= "unknown",
> +	[TYPEC_ORIENTATION_NORMAL]		= "normal",
> +	[TYPEC_ORIENTATION_REVERSE]		= "reversed",
> +};
> +
> +static ssize_t connector_orientation_show(struct device *dev,
> +						struct device_attribute *attr,
> +						char *buf)
> +{
> +	struct typec_port *p = to_typec_port(dev);
> +
> +	return sprintf(buf, "%s\n",
> +		       typec_connector_orientation[p->orientation]);
> +}
> +static DEVICE_ATTR_RO(connector_orientation);
> +
>  static struct attribute *typec_attrs[] = {
>  	&dev_attr_data_role.attr,
>  	&dev_attr_power_operation_mode.attr,
> @@ -1255,6 +1272,7 @@ static struct attribute *typec_attrs[] = {
>  	&dev_attr_usb_typec_revision.attr,
>  	&dev_attr_vconn_source.attr,
>  	&dev_attr_port_type.attr,
> +	&dev_attr_connector_orientation.attr,
>  	NULL,
>  };
>  ATTRIBUTE_GROUPS(typec);

thanks,

-- 
heikki