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/*
* 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.
*/
#ifndef NET_CAN_EMU_H
#define NET_CAN_EMU_H
#include "qemu/queue.h"
#include "qom/object.h"
/* NOTE: the following two structures is copied from <linux/can.h>. */
/*
* Controller Area Network Identifier structure
*
* bit 0-28 : CAN identifier (11/29 bit)
* bit 29 : error frame flag (0 = data frame, 1 = error frame)
* bit 30 : remote transmission request flag (1 = rtr frame)
* bit 31 : frame format flag (0 = standard 11 bit, 1 = extended 29 bit)
*/
typedef uint32_t qemu_canid_t;
typedef struct qemu_can_frame {
qemu_canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */
uint8_t can_dlc; /* data length code: 0 .. 8 */
uint8_t data[8] QEMU_ALIGNED(8);
} qemu_can_frame;
/* Keep defines for QEMU separate from Linux ones for now */
#define QEMU_CAN_EFF_FLAG 0x80000000U /* EFF/SFF is set in the MSB */
#define QEMU_CAN_RTR_FLAG 0x40000000U /* remote transmission request */
#define QEMU_CAN_ERR_FLAG 0x20000000U /* error message frame */
#define QEMU_CAN_SFF_MASK 0x000007FFU /* standard frame format (SFF) */
#define QEMU_CAN_EFF_MASK 0x1FFFFFFFU /* extended frame format (EFF) */
/**
* struct qemu_can_filter - CAN ID based filter in can_register().
* @can_id: relevant bits of CAN ID which are not masked out.
* @can_mask: CAN mask (see description)
*
* Description:
* A filter matches, when
*
* <received_can_id> & mask == can_id & mask
*
* The filter can be inverted (QEMU_CAN_INV_FILTER bit set in can_id) or it can
* filter for error message frames (QEMU_CAN_ERR_FLAG bit set in mask).
*/
typedef struct qemu_can_filter {
qemu_canid_t can_id;
qemu_canid_t can_mask;
} qemu_can_filter;
/* QEMU_CAN_INV_FILTER can be set in qemu_can_filter.can_id */
#define QEMU_CAN_INV_FILTER 0x20000000U
typedef struct CanBusClientState CanBusClientState;
typedef struct CanBusState CanBusState;
typedef struct CanBusClientInfo {
bool (*can_receive)(CanBusClientState *);
ssize_t (*receive)(CanBusClientState *,
const struct qemu_can_frame *frames, size_t frames_cnt);
} CanBusClientInfo;
struct CanBusClientState {
CanBusClientInfo *info;
CanBusState *bus;
int link_down;
QTAILQ_ENTRY(CanBusClientState) next;
CanBusClientState *peer;
char *model;
char *name;
void (*destructor)(CanBusClientState *);
};
#define TYPE_CAN_BUS "can-bus"
#define CAN_BUS(obj) \
OBJECT_CHECK(CanBusState, (obj), TYPE_CAN_BUS)
int can_bus_filter_match(struct qemu_can_filter *filter, qemu_canid_t can_id);
int can_bus_insert_client(CanBusState *bus, CanBusClientState *client);
int can_bus_remove_client(CanBusClientState *client);
ssize_t can_bus_client_send(CanBusClientState *,
const struct qemu_can_frame *frames,
size_t frames_cnt);
int can_bus_client_set_filters(CanBusClientState *,
const struct qemu_can_filter *filters,
size_t filters_cnt);
#endif
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