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
  28 #include "qemu/osdep.h"
  29 #include "chardev/char.h"
  30 #include "qemu/module.h"
  31 #include "qemu/sockets.h"
  32 #include "qapi/error.h"
  33 #include "qom/object_interfaces.h"
  34 #include "net/can_emu.h"
  35 #include "net/can_host.h"
  36
  37 struct CanBusState {
  38     Object object;
  39
  40     QTAILQ_HEAD(, CanBusClientState) clients;
  41 };
  42
  43 static void can_host_disconnect(CanHostState *ch)
  44 {
  45     CanHostClass *chc = CAN_HOST_GET_CLASS(ch);
  46
  47     can_bus_remove_client(&ch->bus_client);
  48     chc->disconnect(ch);
  49 }
  50
  51 static void can_host_connect(CanHostState *ch, Error **errp)
  52 {
  53     CanHostClass *chc = CAN_HOST_GET_CLASS(ch);
  54     Error *local_err = NULL;
  55
  56     if (ch->bus == NULL) {
  57         error_setg(errp, "'canbus' property not set");
  58         return;
  59     }
  60
  61     chc->connect(ch, &local_err);
  62     if (local_err) {
  63         error_propagate(errp, local_err);
  64         return;
  65     }
  66
  67     can_bus_insert_client(ch->bus, &ch->bus_client);
  68 }
  69
  70 static void can_host_unparent(Object *obj)
  71 {
  72     can_host_disconnect(CAN_HOST(obj));
  73 }
  74
  75 static void can_host_complete(UserCreatable *uc, Error **errp)
  76 {
  77     can_host_connect(CAN_HOST(uc), errp);
  78 }
  79
  80 static void can_host_class_init(ObjectClass *klass,
  81                                 void *class_data G_GNUC_UNUSED)
  82 {
  83     UserCreatableClass *uc_klass = USER_CREATABLE_CLASS(klass);
  84
  85     object_class_property_add_link(klass, "canbus", TYPE_CAN_BUS,
  86                                    offsetof(CanHostState, bus),
  87                                    object_property_allow_set_link,
  88                                    OBJ_PROP_LINK_STRONG);
  89
  90     klass->unparent = can_host_unparent;
  91     uc_klass->complete = can_host_complete;
  92 }
  93
  94 static const TypeInfo can_host_info = {
  95     .parent = TYPE_OBJECT,
  96     .name = TYPE_CAN_HOST,
  97     .instance_size = sizeof(CanHostState),
  98     .class_size = sizeof(CanHostClass),
  99     .abstract = true,
 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);