Hi Hans,
On Tue, Jul 14, 2020 at 01:36:15PM +0200, Hans de Goede wrote:
> This can be used by Type-C controller drivers which use a standard
> usb-connector fwnode, with altmodes sub-node, to describe the available
> altmodes.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> drivers/usb/typec/class.c | 56 +++++++++++++++++++++++++++++++++++++++
> include/linux/usb/typec.h | 7 +++++
> 2 files changed, 63 insertions(+)
>
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index c9234748537a..47de2b2e3d54 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -1607,6 +1607,62 @@ typec_port_register_altmode(struct typec_port *port,
> }
> EXPORT_SYMBOL_GPL(typec_port_register_altmode);
>
> +void typec_port_register_altmodes_from_fwnode(struct typec_port *port,
> + const struct typec_altmode_ops *ops, void *drvdata,
> + struct typec_altmode **altmodes, size_t n,
> + struct fwnode_handle *fwnode)
> +{
> + struct fwnode_handle *altmodes_node, *child;
> + struct typec_altmode_desc desc;
> + struct typec_altmode *alt;
> + size_t index = 0;
> + u32 svid, vdo;
> + int ret;
> +
> + altmodes_node = fwnode_get_named_child_node(fwnode, "altmodes");
> + if (!altmodes_node)
> + return;
Do we need that? Why not just make the sub-nodes describing the
alternate modes direct children of the connector node instead of
grouping them under a special sub-node?
If the child node of the connector has device properties "svid" and
"vdo" then it is an alt mode that the connector supports, and it can't
be anything else, no?
> + child = NULL;
> + while ((child = fwnode_get_next_child_node(altmodes_node, child))) {
> + ret = fwnode_property_read_u32(child, "svid", &svid);
> + if (ret) {
> + dev_err(&port->dev, "Error reading svid for altmode %s\n",
> + fwnode_get_name(child));
> + continue;
> + }
> +
> + ret = fwnode_property_read_u32(child, "vdo", &vdo);
> + if (ret) {
> + dev_err(&port->dev, "Error reading vdo for altmode %s\n",
> + fwnode_get_name(child));
> + continue;
> + }
> +
> + if (index >= n) {
> + dev_err(&port->dev, "Error not enough space for altmode %s\n",
> + fwnode_get_name(child));
> + continue;
> + }
> +
> + desc.svid = svid;
> + desc.vdo = vdo;
> + desc.mode = index + 1;
> + alt = typec_port_register_altmode(port, &desc);
> + if (IS_ERR(alt)) {
> + dev_err(&port->dev, "Error registering altmode %s\n",
> + fwnode_get_name(child));
> + continue;
> + }
> +
> + alt->ops = ops;
> + typec_altmode_set_drvdata(alt, drvdata);
> + altmodes[index] = alt;
> + index++;
> + }
> +}
> +EXPORT_SYMBOL_GPL(typec_port_register_altmodes_from_fwnode);
> +
> /**
> * typec_register_port - Register a USB Type-C Port
> * @parent: Parent device
> diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
> index 5daa1c49761c..fbe4bccb3a98 100644
> --- a/include/linux/usb/typec.h
> +++ b/include/linux/usb/typec.h
> @@ -17,6 +17,7 @@ struct typec_partner;
> struct typec_cable;
> struct typec_plug;
> struct typec_port;
> +struct typec_altmode_ops;
>
> struct fwnode_handle;
> struct device;
> @@ -121,6 +122,12 @@ struct typec_altmode
> struct typec_altmode
> *typec_port_register_altmode(struct typec_port *port,
> const struct typec_altmode_desc *desc);
> +
> +void typec_port_register_altmodes_from_fwnode(struct typec_port *port,
> + const struct typec_altmode_ops *ops, void *drvdata,
> + struct typec_altmode **altmodes, size_t n,
> + struct fwnode_handle *fwnode);
> +
> void typec_unregister_altmode(struct typec_altmode *altmode);
>
> struct typec_port *typec_altmode2port(struct typec_altmode *alt);
> --
> 2.26.2
thanks,
--
heikki
