net/can/can_host.c

   1 /*
   2  * CAN generic CAN host connection support
   3  *
   4  * Copyright (c) 2013-2014 Jin Yang
   5  * Copyright (c) 2014-2018 Pavel Pisa
   6  *
   7  * Initial development supported by Google GSoC 2013 from RTEMS project slot
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27 #include "qemu/osdep.h"
  28 #include "chardev/char.h"
  29 #include "qemu/sockets.h"
  30 #include "qapi/error.h"
  31 #include "qom/object_interfaces.h"
  32 #include "net/can_emu.h"
  33 #include "net/can_host.h"
  34
  35 struct CanBusState {
  36     Object object;
  37
  38     QTAILQ_HEAD(, CanBusClientState) clients;
  39 };
  40
  41 static void can_host_disconnect(CanHostState *ch)
  42 {
  43     CanHostClass *chc = CAN_HOST_GET_CLASS(ch);
  44
  45     can_bus_remove_client(&ch->bus_client);
  46     chc->disconnect(ch);
  47 }
  48
  49 static void can_host_connect(CanHostState *ch, Error **errp)
  50 {
  51     CanHostClass *chc = CAN_HOST_GET_CLASS(ch);
  52     Error *local_err = NULL;
  53
  54     chc->connect(ch, &local_err);
  55     if (local_err) {
  56         error_propagate(errp, local_err);
  57         return;
  58     }
  59
  60     can_bus_insert_client(ch->bus, &ch->bus_client);
  61 }
  62
  63 static void can_host_unparent(Object *obj)
  64 {
  65     can_host_disconnect(CAN_HOST(obj));
  66 }
  67
  68 static void can_host_complete(UserCreatable *uc, Error **errp)
  69 {
  70     can_host_connect(CAN_HOST(uc), errp);
  71 }
  72
  73 static void can_host_instance_init(Object *obj)
  74 {
  75     CanHostState *ch = CAN_HOST(obj);
  76
  77     object_property_add_link(obj, "canbus", TYPE_CAN_BUS,
  78                              (Object **)&ch->bus,
  79                              object_property_allow_set_link,
  80                              OBJ_PROP_LINK_STRONG,
  81                              &error_abort);
  82 }
  83
  84 static void can_host_class_init(ObjectClass *klass,
  85                                 void *class_data G_GNUC_UNUSED)
  86 {
  87     UserCreatableClass *uc_klass = USER_CREATABLE_CLASS(klass);
  88
  89     klass->unparent = can_host_unparent;
  90     uc_klass->complete = can_host_complete;
  91 }
  92
  93 static const TypeInfo can_host_info = {
  94     .parent = TYPE_OBJECT,
  95     .name = TYPE_CAN_HOST,
  96     .instance_size = sizeof(CanHostState),
  97     .class_size = sizeof(CanHostClass),
  98     .abstract = true,
  99     .instance_init = can_host_instance_init,
 100     .class_init = can_host_class_init,
 101     .interfaces = (InterfaceInfo[]) {
 102         { TYPE_USER_CREATABLE },
 103         { }
 104     }
 105 };
 106
 107 static void can_host_register_types(void)
 108 {
 109     type_register_static(&can_host_info);
 110 }
 111
 112 type_init(can_host_register_types);