usb: typec: Add typec_partner_set_pd_revision

The partner's PD revision may be resolved later than the port partner
registration since the port partner creation may take place once
Type-C detects the port has changed state, but before PD communication is
completed.

Add a setter so that the partner's PD revision can be attached to it once
it becomes available.

If the revision is set to a valid version (not 0), the setter will also
refresh the partner's usb_pd flag and notify on "supports_usb_power_delivery"
sysfs property as well.

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Benson Leung <bleung@chromium.org>
Link: https://lore.kernel.org/r/20210129061406.2680146-4-bleung@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index b5241f4..b6ceab3 100644 (file)
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -749,6 +749,36 @@ int typec_partner_set_identity(struct typec_partner *partner)
 EXPORT_SYMBOL_GPL(typec_partner_set_identity);
 
 /**
+ * typec_partner_set_pd_revision - Set the PD revision supported by the partner
+ * @partner: The partner to be updated.
+ * @pd_revision:  USB Power Delivery Specification Revision supported by partner
+ *
+ * This routine is used to report that the PD revision of the port partner has
+ * become available.
+ *
+ * Returns 0 on success or negative error number on failure.
+ */
+int typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision)
+{
+       int ret;
+
+       if (partner->pd_revision == pd_revision)
+               return 0;
+
+       partner->pd_revision = pd_revision;
+       sysfs_notify(&partner->dev.kobj, NULL, "usb_power_delivery_revision");
+       if (pd_revision != 0 && !partner->usb_pd) {
+               partner->usb_pd = 1;
+               sysfs_notify(&partner->dev.kobj, NULL,
+                            "supports_usb_power_delivery");
+       }
+       kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(typec_partner_set_pd_revision);
+
+/**
  * typec_partner_set_num_altmodes - Set the number of available partner altmodes
  * @partner: The partner to be updated.
  * @num_altmodes: The number of altmodes we want to specify as available.

diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index 42c6b7c..4946eca 100644 (file)
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -126,6 +126,7 @@ struct typec_altmode_desc {
        enum typec_port_data    roles;
 };
 
+int typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision);
 int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes);
 struct typec_altmode
 *typec_partner_register_altmode(struct typec_partner *partner,