1 files changed, 123 insertions, 0 deletions
diff --git a/include/net/can_emu.h b/include/net/can_emu.h
new file mode 100644
index 0000000000..1da4d01b95
--- /dev/null
+++ b/include/net/can_emu.h
@@ -0,0 +1,123 @@
+/*
+ * 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 "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 {
+    int (*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_CLASS(klass) \
+     OBJECT_CLASS_CHECK(CanBusClass, (klass), TYPE_CAN_BUS)
+#define CAN_BUS_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(CanBusClass, (obj), TYPE_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