greybus: core: add module abstraction

Add Greybus module abstraction that will be used to implement controlled
module removal (eject) and represent module geometry.

Greybus module devices correspond to physical modules and have one or
more interfaces. Modules have an id that is identical to the id of their
primary interface, which in turn is the interface with lowest numbered
id. The module name is constructed from the bus and module id:

        <bus_id>-<module_id>

Interfaces, bundles, and control devices are consequently renamed as

        <bus_id>-<module_id>.<interface_id>
        <bus_id>-<module_id>.<interface_id>.<bundle_id>
        <bus_id>-<module_id>.<interface_id>.ctrl

As before, interface ids (and therefore in a sense now also module ids)
correspond to physical interface positions on the frame.

Modules have the following attributes:

        module_id
        num_interfaces

where module_id is the id of the module and num_interface the number of
interfaces the module has.

Note that until SVC module-size detection has been implemented, all
interfaces are considered to be part of 1x2 modules. Specifically, the
two interfaces of a 2x2 module will be presented as two 1x2 modules for
now.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/staging/greybus/interface.h b/drivers/staging/greybus/interface.h
index 63ba696c14a5..9185c7f1bd32 100644
--- a/drivers/staging/greybus/interface.h
+++ b/drivers/staging/greybus/interface.h
@@ -20,7 +20,7 @@ struct gb_interface {
 	struct gb_control *control;
 
 	struct list_head bundles;
-	struct list_head links;	/* gb_host_device->interfaces */
+	struct list_head module_node;
 	struct list_head manifest_descs;
 	u8 interface_id;	/* Physical location within the Endo */
 	u8 device_id;
@@ -35,6 +35,7 @@ struct gb_interface {
 	u16 version_minor;
 
 	struct gb_host_device *hd;
+	struct gb_module *module;
 
 	unsigned long quirks;
 
@@ -46,13 +47,14 @@ struct gb_interface {
 struct gb_interface *gb_interface_find(struct gb_host_device *hd,
 				       u8 interface_id);
 
-struct gb_interface *gb_interface_create(struct gb_host_device *hd,
+struct gb_interface *gb_interface_create(struct gb_module *module,
 					 u8 interface_id);
 int gb_interface_activate(struct gb_interface *intf);
 void gb_interface_deactivate(struct gb_interface *intf);
 int gb_interface_enable(struct gb_interface *intf);
 void gb_interface_disable(struct gb_interface *intf);
 int gb_interface_add(struct gb_interface *intf);
-void gb_interface_remove(struct gb_interface *intf);
+void gb_interface_del(struct gb_interface *intf);
+void gb_interface_put(struct gb_interface *intf);
 
 #endif /* __INTERFACE_H */