141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*
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* CAN common CAN bus emulation support
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*
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* Copyright (c) 2013-2014 Jin Yang
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* Copyright (c) 2014-2018 Pavel Pisa
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*
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* Initial development supported by Google GSoC 2013 from RTEMS project slot
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "chardev/char.h"
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#include "qemu/module.h"
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#include "qemu/sockets.h"
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#include "qapi/error.h"
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#include "net/can_emu.h"
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#include "qom/object_interfaces.h"
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struct CanBusState {
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Object object;
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QTAILQ_HEAD(, CanBusClientState) clients;
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};
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static void can_bus_instance_init(Object *object)
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{
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CanBusState *bus = (CanBusState *)object;
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QTAILQ_INIT(&bus->clients);
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}
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int can_bus_insert_client(CanBusState *bus, CanBusClientState *client)
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{
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client->bus = bus;
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QTAILQ_INSERT_TAIL(&bus->clients, client, next);
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return 0;
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}
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int can_bus_remove_client(CanBusClientState *client)
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{
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CanBusState *bus = client->bus;
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if (bus == NULL) {
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return 0;
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}
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QTAILQ_REMOVE(&bus->clients, client, next);
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client->bus = NULL;
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return 1;
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}
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ssize_t can_bus_client_send(CanBusClientState *client,
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const struct qemu_can_frame *frames, size_t frames_cnt)
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{
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int ret = 0;
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CanBusState *bus = client->bus;
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CanBusClientState *peer;
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if (bus == NULL) {
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return -1;
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}
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QTAILQ_FOREACH(peer, &bus->clients, next) {
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if (peer->info->can_receive(peer)) {
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if (peer == client) {
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/* No loopback support for now */
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continue;
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}
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if (peer->info->receive(peer, frames, frames_cnt) > 0) {
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ret = 1;
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}
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}
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}
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return ret;
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}
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int can_bus_filter_match(struct qemu_can_filter *filter, qemu_canid_t can_id)
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{
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int m;
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if (((can_id | filter->can_mask) & QEMU_CAN_ERR_FLAG)) {
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return (filter->can_mask & QEMU_CAN_ERR_FLAG) != 0;
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}
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m = (can_id & filter->can_mask) == (filter->can_id & filter->can_mask);
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return filter->can_id & QEMU_CAN_INV_FILTER ? !m : m;
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}
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int can_bus_client_set_filters(CanBusClientState *client,
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const struct qemu_can_filter *filters, size_t filters_cnt)
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{
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return 0;
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}
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static bool can_bus_can_be_deleted(UserCreatable *uc)
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{
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return false;
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}
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static void can_bus_class_init(ObjectClass *klass,
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void *class_data G_GNUC_UNUSED)
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{
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UserCreatableClass *uc_klass = USER_CREATABLE_CLASS(klass);
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uc_klass->can_be_deleted = can_bus_can_be_deleted;
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}
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static const TypeInfo can_bus_info = {
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.parent = TYPE_OBJECT,
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.name = TYPE_CAN_BUS,
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.instance_size = sizeof(CanBusState),
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.instance_init = can_bus_instance_init,
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.class_init = can_bus_class_init,
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.interfaces = (InterfaceInfo[]) {
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{ TYPE_USER_CREATABLE },
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{ }
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}
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};
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static void can_bus_register_types(void)
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{
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type_register_static(&can_bus_info);
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}
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type_init(can_bus_register_types);
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