LXR qemu/net/can/can

   1/*
   2 * CAN common CAN bus emulation 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 "net/can_emu.h"
  34#include "qom/object_interfaces.h"
  35
  36struct CanBusState {
  37    Object object;
  38
  39    QTAILQ_HEAD(, CanBusClientState) clients;
  40};
  41
  42static void can_bus_instance_init(Object *object)
  43{
  44    CanBusState *bus = (CanBusState *)object;
  45
  46    QTAILQ_INIT(&bus->clients);
  47}
  48
  49int can_bus_insert_client(CanBusState *bus, CanBusClientState *client)
  50{
  51    client->bus = bus;
  52    QTAILQ_INSERT_TAIL(&bus->clients, client, next);
  53    return 0;
  54}
  55
  56int can_bus_remove_client(CanBusClientState *client)
  57{
  58    CanBusState *bus = client->bus;
  59    if (bus == NULL) {
  60        return 0;
  61    }
  62
  63    QTAILQ_REMOVE(&bus->clients, client, next);
  64    client->bus = NULL;
  65    return 1;
  66}
  67
  68ssize_t can_bus_client_send(CanBusClientState *client,
  69             const struct qemu_can_frame *frames, size_t frames_cnt)
  70{
  71    int ret = 0;
  72    CanBusState *bus = client->bus;
  73    CanBusClientState *peer;
  74    if (bus == NULL) {
  75        return -1;
  76    }
  77
  78    QTAILQ_FOREACH(peer, &bus->clients, next) {
  79        if (peer->info->can_receive(peer)) {
  80            if (peer == client) {
  81                /* No loopback support for now */
  82                continue;
  83            }
  84            if (peer->info->receive(peer, frames, frames_cnt) > 0) {
  85                ret = 1;
  86            }
  87        }
  88    }
  89
  90    return ret;
  91}
  92
  93int can_bus_filter_match(struct qemu_can_filter *filter, qemu_canid_t can_id)
  94{
  95    int m;
  96    if (((can_id | filter->can_mask) & QEMU_CAN_ERR_FLAG)) {
  97        return (filter->can_mask & QEMU_CAN_ERR_FLAG) != 0;
  98    }
  99    m = (can_id & filter->can_mask) == (filter->can_id & filter->can_mask);
 100    return filter->can_id & QEMU_CAN_INV_FILTER ? !m : m;
 101}
 102
 103int can_bus_client_set_filters(CanBusClientState *client,
 104             const struct qemu_can_filter *filters, size_t filters_cnt)
 105{
 106    return 0;
 107}
 108
 109
 110static bool can_bus_can_be_deleted(UserCreatable *uc)
 111{
 112    return false;
 113}
 114
 115static void can_bus_class_init(ObjectClass *klass,
 116                                void *class_data G_GNUC_UNUSED)
 117{
 118    UserCreatableClass *uc_klass = USER_CREATABLE_CLASS(klass);
 119
 120    uc_klass->can_be_deleted = can_bus_can_be_deleted;
 121}
 122
 123static const TypeInfo can_bus_info = {
 124    .parent = TYPE_OBJECT,
 125    .name = TYPE_CAN_BUS,
 126    .instance_size = sizeof(CanBusState),
 127    .instance_init = can_bus_instance_init,
 128    .class_init = can_bus_class_init,
 129    .interfaces = (InterfaceInfo[]) {
 130        { TYPE_USER_CREATABLE },
 131        { }
 132    }
 133};
 134
 135static void can_bus_register_types(void)
 136{
 137    type_register_static(&can_bus_info);
 138}
 139
 140type_init(can_bus_register_types);
 141