On Wed, Aug 17, 2016 at 01:34:40PM +0300, Heikki Krogerus wrote:
> The purpose of USB Type-C connector class is to provide
> unified interface for the user space to get the status and
> basic information about USB Type-C connectors on a system,
> control over data role swapping, and when the port supports
> USB Power Delivery, also control over power role swapping
> and Alternate Modes.
>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
[ ... ]
> +
> +static ssize_t current_power_role_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t size)
> +{
> + struct typec_port *port = to_typec_port(dev);
> + enum typec_role role;
> + int ret = size;
> +
> + if (!port->cap->usb_pd) {
> + dev_dbg(dev, "power role swap only supported with USB PD\n");
> + return -EOPNOTSUPP;
> + }
> +
> + if (!port->cap->pr_set) {
> + dev_dbg(dev, "power role swapping not supported\n");
> + return -EOPNOTSUPP;
> + }
> +
> + if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
> + dev_dbg(dev, "partner unable to swap power role\n");
> + return -EIO;
> + }
> +
> + if (!port->connected)
> + return size;
> +
> + ret = sysfs_strmatch(typec_roles, ARRAY_SIZE(typec_roles), buf);
> + if (ret < 0)
> + return ret;
> +
> + role = ret;
> +
> + ret = port->cap->pr_set(port->cap, role);
if (ret)
missing.
> + return ret;
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