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 #ifndef NET_CAN_EMU_H 29 #define NET_CAN_EMU_H 30 31 #include "qom/object.h" 32 33 /* NOTE: the following two structures is copied from <linux/can.h>. */ 34 35 /* 36 * Controller Area Network Identifier structure 37 * 38 * bit 0-28 : CAN identifier (11/29 bit) 39 * bit 29 : error frame flag (0 = data frame, 1 = error frame) 40 * bit 30 : remote transmission request flag (1 = rtr frame) 41 * bit 31 : frame format flag (0 = standard 11 bit, 1 = extended 29 bit) 42 */ 43 typedef uint32_t qemu_canid_t; 44 45 typedef struct qemu_can_frame { 46 qemu_canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */ 47 uint8_t can_dlc; /* data length code: 0 .. 8 */ 48 uint8_t data[8] QEMU_ALIGNED(8); 49 } qemu_can_frame; 50 51 /* Keep defines for QEMU separate from Linux ones for now */ 52 53 #define QEMU_CAN_EFF_FLAG 0x80000000U /* EFF/SFF is set in the MSB */ 54 #define QEMU_CAN_RTR_FLAG 0x40000000U /* remote transmission request */ 55 #define QEMU_CAN_ERR_FLAG 0x20000000U /* error message frame */ 56 57 #define QEMU_CAN_SFF_MASK 0x000007FFU /* standard frame format (SFF) */ 58 #define QEMU_CAN_EFF_MASK 0x1FFFFFFFU /* extended frame format (EFF) */ 59 60 /** 61 * struct qemu_can_filter - CAN ID based filter in can_register(). 62 * @can_id: relevant bits of CAN ID which are not masked out. 63 * @can_mask: CAN mask (see description) 64 * 65 * Description: 66 * A filter matches, when 67 * 68 * <received_can_id> & mask == can_id & mask 69 * 70 * The filter can be inverted (QEMU_CAN_INV_FILTER bit set in can_id) or it can 71 * filter for error message frames (QEMU_CAN_ERR_FLAG bit set in mask). 72 */ 73 typedef struct qemu_can_filter { 74 qemu_canid_t can_id; 75 qemu_canid_t can_mask; 76 } qemu_can_filter; 77 78 /* QEMU_CAN_INV_FILTER can be set in qemu_can_filter.can_id */ 79 #define QEMU_CAN_INV_FILTER 0x20000000U 80 81 typedef struct CanBusClientState CanBusClientState; 82 typedef struct CanBusState CanBusState; 83 84 typedef struct CanBusClientInfo { 85 int (*can_receive)(CanBusClientState *); 86 ssize_t (*receive)(CanBusClientState *, 87 const struct qemu_can_frame *frames, size_t frames_cnt); 88 } CanBusClientInfo; 89 90 struct CanBusClientState { 91 CanBusClientInfo *info; 92 CanBusState *bus; 93 int link_down; 94 QTAILQ_ENTRY(CanBusClientState) next; 95 CanBusClientState *peer; 96 char *model; 97 char *name; 98 void (*destructor)(CanBusClientState *); 99 }; 100 101 #define TYPE_CAN_BUS "can-bus" 102 #define CAN_BUS_CLASS(klass) \ 103 OBJECT_CLASS_CHECK(CanBusClass, (klass), TYPE_CAN_BUS) 104 #define CAN_BUS_GET_CLASS(obj) \ 105 OBJECT_GET_CLASS(CanBusClass, (obj), TYPE_CAN_BUS) 106 #define CAN_BUS(obj) \ 107 OBJECT_CHECK(CanBusState, (obj), TYPE_CAN_BUS) 108 109 int can_bus_filter_match(struct qemu_can_filter *filter, qemu_canid_t can_id); 110 111 int can_bus_insert_client(CanBusState *bus, CanBusClientState *client); 112 113 int can_bus_remove_client(CanBusClientState *client); 114 115 ssize_t can_bus_client_send(CanBusClientState *, 116 const struct qemu_can_frame *frames, 117 size_t frames_cnt); 118 119 int can_bus_client_set_filters(CanBusClientState *, 120 const struct qemu_can_filter *filters, 121 size_t filters_cnt); 122 123 #endif 124