mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Jan Charvat](/assets/img/avatar_default.png)
Signed-off-by: Jan Charvat <charvj10@fel.cvut.cz> Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz> Reviewed-by: Vikram Garhwal <fnu.vikram@xilinx.com> Message-Id: <0a2efc6ef9c458505952ed230e49ae25cad7f324.1600069689.git.pisa@cmp.felk.cvut.cz> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
177 lines
5.1 KiB
C
177 lines
5.1 KiB
C
/*
|
|
* CAN common CAN bus emulation support
|
|
*
|
|
* Copyright (c) 2013-2014 Jin Yang
|
|
* Copyright (c) 2014-2018 Pavel Pisa
|
|
*
|
|
* Initial development supported by Google GSoC 2013 from RTEMS project slot
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "chardev/char.h"
|
|
#include "qemu/module.h"
|
|
#include "qemu/sockets.h"
|
|
#include "qapi/error.h"
|
|
#include "net/can_emu.h"
|
|
#include "qom/object_interfaces.h"
|
|
|
|
/* CAN DLC to real data length conversion helpers */
|
|
|
|
static const uint8_t dlc2len[] = {
|
|
0, 1, 2, 3, 4, 5, 6, 7,
|
|
8, 12, 16, 20, 24, 32, 48, 64
|
|
};
|
|
|
|
/* get data length from can_dlc with sanitized can_dlc */
|
|
uint8_t can_dlc2len(uint8_t can_dlc)
|
|
{
|
|
return dlc2len[can_dlc & 0x0F];
|
|
}
|
|
|
|
static const uint8_t len2dlc[] = {
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, /* 0 - 8 */
|
|
9, 9, 9, 9, /* 9 - 12 */
|
|
10, 10, 10, 10, /* 13 - 16 */
|
|
11, 11, 11, 11, /* 17 - 20 */
|
|
12, 12, 12, 12, /* 21 - 24 */
|
|
13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */
|
|
14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */
|
|
14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */
|
|
15, 15, 15, 15, 15, 15, 15, 15, /* 49 - 56 */
|
|
15, 15, 15, 15, 15, 15, 15, 15 /* 57 - 64 */
|
|
};
|
|
|
|
/* map the sanitized data length to an appropriate data length code */
|
|
uint8_t can_len2dlc(uint8_t len)
|
|
{
|
|
if (unlikely(len > 64)) {
|
|
return 0xF;
|
|
}
|
|
|
|
return len2dlc[len];
|
|
}
|
|
|
|
struct CanBusState {
|
|
Object object;
|
|
|
|
QTAILQ_HEAD(, CanBusClientState) clients;
|
|
};
|
|
|
|
static void can_bus_instance_init(Object *object)
|
|
{
|
|
CanBusState *bus = (CanBusState *)object;
|
|
|
|
QTAILQ_INIT(&bus->clients);
|
|
}
|
|
|
|
int can_bus_insert_client(CanBusState *bus, CanBusClientState *client)
|
|
{
|
|
client->bus = bus;
|
|
QTAILQ_INSERT_TAIL(&bus->clients, client, next);
|
|
return 0;
|
|
}
|
|
|
|
int can_bus_remove_client(CanBusClientState *client)
|
|
{
|
|
CanBusState *bus = client->bus;
|
|
if (bus == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
QTAILQ_REMOVE(&bus->clients, client, next);
|
|
client->bus = NULL;
|
|
return 1;
|
|
}
|
|
|
|
ssize_t can_bus_client_send(CanBusClientState *client,
|
|
const struct qemu_can_frame *frames, size_t frames_cnt)
|
|
{
|
|
int ret = 0;
|
|
CanBusState *bus = client->bus;
|
|
CanBusClientState *peer;
|
|
if (bus == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
QTAILQ_FOREACH(peer, &bus->clients, next) {
|
|
if (peer->info->can_receive(peer)) {
|
|
if (peer == client) {
|
|
/* No loopback support for now */
|
|
continue;
|
|
}
|
|
if (peer->info->receive(peer, frames, frames_cnt) > 0) {
|
|
ret = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int can_bus_filter_match(struct qemu_can_filter *filter, qemu_canid_t can_id)
|
|
{
|
|
int m;
|
|
if (((can_id | filter->can_mask) & QEMU_CAN_ERR_FLAG)) {
|
|
return (filter->can_mask & QEMU_CAN_ERR_FLAG) != 0;
|
|
}
|
|
m = (can_id & filter->can_mask) == (filter->can_id & filter->can_mask);
|
|
return filter->can_id & QEMU_CAN_INV_FILTER ? !m : m;
|
|
}
|
|
|
|
int can_bus_client_set_filters(CanBusClientState *client,
|
|
const struct qemu_can_filter *filters, size_t filters_cnt)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
static bool can_bus_can_be_deleted(UserCreatable *uc)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static void can_bus_class_init(ObjectClass *klass,
|
|
void *class_data G_GNUC_UNUSED)
|
|
{
|
|
UserCreatableClass *uc_klass = USER_CREATABLE_CLASS(klass);
|
|
|
|
uc_klass->can_be_deleted = can_bus_can_be_deleted;
|
|
}
|
|
|
|
static const TypeInfo can_bus_info = {
|
|
.parent = TYPE_OBJECT,
|
|
.name = TYPE_CAN_BUS,
|
|
.instance_size = sizeof(CanBusState),
|
|
.instance_init = can_bus_instance_init,
|
|
.class_init = can_bus_class_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ TYPE_USER_CREATABLE },
|
|
{ }
|
|
}
|
|
};
|
|
|
|
static void can_bus_register_types(void)
|
|
{
|
|
type_register_static(&can_bus_info);
|
|
}
|
|
|
|
type_init(can_bus_register_types);
|