| /* |
| * Greybus interfaces |
| * |
| * Copyright 2014 Google Inc. |
| * |
| * Released under the GPLv2 only. |
| */ |
| |
| #include "greybus.h" |
| |
| /* XXX This could be per-host device or per-module */ |
| static DEFINE_SPINLOCK(gb_interfaces_lock); |
| |
| /* |
| * A Greybus interface represents a UniPro device present on a |
| * module. For Project Ara, each active Interface Block on a module |
| * implements a UniPro device, and therefore a Greybus interface. A |
| * Greybus module has at least one interface, but can have two (or |
| * even more). |
| * |
| * Create a gb_interface structure to represent a discovered |
| * interface. Returns a pointer to the new interface or a null |
| * pointer if a failure occurs due to memory exhaustion. |
| */ |
| struct gb_interface * |
| gb_interface_create(struct gb_module *gmod, u8 interface_id) |
| { |
| struct gb_interface *interface; |
| |
| interface = kzalloc(sizeof(*interface), GFP_KERNEL); |
| if (!interface) |
| return NULL; |
| |
| interface->gmod = gmod; /* XXX refcount? */ |
| interface->id = interface_id; |
| INIT_LIST_HEAD(&interface->connections); |
| |
| spin_lock_irq(&gb_interfaces_lock); |
| list_add_tail(&interface->links, &gmod->interfaces); |
| spin_unlock_irq(&gb_interfaces_lock); |
| |
| return interface; |
| } |
| |
| /* |
| * Tear down a previously set up interface. |
| */ |
| void gb_interface_destroy(struct gb_interface *interface) |
| { |
| if (WARN_ON(!interface)) |
| return; |
| |
| spin_lock_irq(&gb_interfaces_lock); |
| list_del(&interface->links); |
| spin_unlock_irq(&gb_interfaces_lock); |
| |
| /* kref_put(gmod); */ |
| kfree(interface); |
| } |