drivers: can: Add support for native_posix board

jukkar · jukkar · commit e93bc66d1acf · 2019-04-17T23:42:38.000+03:00
This initial version supports SocketCAN. The driver passes
CANBUS data between Linux vcan virtual CAN driver and Zephyr.

You also need to use can-setup.sh script from the net-tools
project in order to make communication work with Linux vcan
driver.

Signed-off-by: Jukka Rissanen &lt;jukka.rissanen@linux.intel.com&gt;
diff --git a/drivers/can/CMakeLists.txt b/drivers/can/CMakeLists.txt
@@ -1,5 +1,17 @@
 # SPDX-License-Identifier: Apache-2.0
 
-zephyr_sources_ifdef(CONFIG_CAN_STM32    stm32_can.c)
+zephyr_sources_ifdef(CONFIG_CAN_STM32	 stm32_can.c)
 zephyr_sources_ifdef(CONFIG_CAN_MCP2515  mcp2515.c)
 zephyr_sources_ifdef(CONFIG_USERSPACE    can_handlers.c)
+
+if(CONFIG_CAN_NATIVE_POSIX)
+	zephyr_library()
+	zephyr_library_include_directories(${ZEPHYR_BASE}/subsys/net/l2)
+	zephyr_library_compile_definitions(NO_POSIX_CHEATS)
+	zephyr_library_compile_definitions(_BSD_SOURCE)
+	zephyr_library_compile_definitions(_DEFAULT_SOURCE)
+	zephyr_library_sources(
+		canbus_native_posix.c
+		canbus_native_posix_adapt.c
+		)
+endif()
diff --git a/drivers/can/Kconfig b/drivers/can/Kconfig
@@ -37,5 +37,6 @@ config CAN_1
 
 source "drivers/can/Kconfig.stm32"
 source "drivers/can/Kconfig.mcp2515"
+source "drivers/can/Kconfig.native_posix"
 
 endif # CAN
diff --git a/drivers/can/Kconfig.native_posix b/drivers/can/Kconfig.native_posix
@@ -0,0 +1,28 @@
+# Kconfig.native_posix - native_posix CAN configuration options
+
+#
+# Copyright (c) 2019 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+config CAN_NATIVE_POSIX
+	bool "native_posix CAN Driver"
+	depends on ARCH_POSIX
+	help
+	  Enable native_posix CAN driver
+
+config CAN_MAX_FILTER
+	int "Maximum number of concurrent active filters"
+	depends on CAN_NATIVE_POSIX
+	default 32
+	range 1 56
+	help
+	  Defines the array size of the callback/msgq pointers.
+	  Must be at least the size of concurrent reads.
+
+config CAN_NATIVE_POSIX_INTERFACE_NAME
+	string "CANBUS interface name in Linux side"
+	default "zcan"
+	help
+	  This option sets the CANBUS network interface name in host system.
diff --git a/drivers/can/canbus_native_posix.c b/drivers/can/canbus_native_posix.c
@@ -0,0 +1,313 @@
+/*
+ * Copyright (c) 2019 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ *
+ * CANBUS driver for native_posix board. This is meant to test CANBUS
+ * connectivity between host and Zephyr.
+ */
+
+#define LOG_MODULE_NAME canbus_posix
+#define LOG_LEVEL CONFIG_CAN_LOG_LEVEL
+
+#include <logging/log.h>
+LOG_MODULE_REGISTER(LOG_MODULE_NAME);
+
+#include <stdio.h>
+
+#include <kernel.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <stddef.h>
+
+#include <net/net_pkt.h>
+#include <net/net_core.h>
+#include <net/net_if.h>
+
+#include <can.h>
+#include <net/socket_can.h>
+
+#include "canbus_native_posix_priv.h"
+
+#define NET_BUF_TIMEOUT K_MSEC(100)
+#define DT_CAN_1_NAME "CAN_1"
+
+struct canbus_np_context {
+	u8_t recv[CAN_MTU];
+
+	struct device *can_dev;
+	struct k_msgq *msgq;
+	struct net_if *iface;
+	const char *if_name;
+	int dev_fd;
+	bool init_done;
+};
+
+NET_STACK_DEFINE(RX_ZCAN, canbus_rx_stack,
+		 CONFIG_ARCH_POSIX_RECOMMENDED_STACK_SIZE,
+		 CONFIG_ARCH_POSIX_RECOMMENDED_STACK_SIZE);
+static struct k_thread rx_thread_data;
+
+/* TODO: support multiple interfaces */
+static struct canbus_np_context canbus_context_data;
+
+static int read_data(struct canbus_np_context *ctx, int fd)
+{
+	struct net_pkt *pkt;
+	int count;
+
+	count = canbus_np_read_data(fd, ctx->recv, sizeof(ctx->recv));
+	if (count <= 0) {
+		return 0;
+	}
+
+	pkt = net_pkt_rx_alloc_with_buffer(ctx->iface, count,
+					   AF_CAN, 0, NET_BUF_TIMEOUT);
+	if (!pkt) {
+		return -ENOMEM;
+	}
+
+	if (net_pkt_write_new(pkt, ctx->recv, count)) {
+		net_pkt_unref(pkt);
+		return -ENOBUFS;
+	}
+
+	if (net_recv_data(ctx->iface, pkt) < 0) {
+		net_pkt_unref(pkt);
+	}
+
+	return 0;
+}
+
+static void canbus_np_rx(struct canbus_np_context *ctx)
+{
+	int ret;
+
+	LOG_DBG("Starting ZCAN RX thread");
+
+	while (1) {
+		if (ctx->iface && net_if_is_up(ctx->iface)) {
+			ret = canbus_np_wait_data(ctx->dev_fd);
+			if (!ret) {
+				read_data(ctx, ctx->dev_fd);
+			}
+		}
+
+		k_sleep(K_MSEC(50));
+	}
+}
+
+static void create_rx_handler(struct canbus_np_context *ctx)
+{
+	k_thread_create(&rx_thread_data, canbus_rx_stack,
+			K_THREAD_STACK_SIZEOF(canbus_rx_stack),
+			(k_thread_entry_t)canbus_np_rx,
+			ctx, NULL, NULL, K_PRIO_COOP(14),
+			0, K_NO_WAIT);
+}
+
+static int canbus_np_init(struct device *dev)
+{
+	struct canbus_np_context *ctx = dev->driver_data;
+
+	ctx->if_name = CONFIG_CAN_NATIVE_POSIX_INTERFACE_NAME;
+
+	ctx->dev_fd = canbus_np_iface_open(ctx->if_name);
+	if (ctx->dev_fd < 0) {
+		LOG_ERR("Cannot open %s (%d)", ctx->if_name, ctx->dev_fd);
+	} else {
+		/* Create a thread that will handle incoming data from host */
+		create_rx_handler(ctx);
+	}
+
+	return 0;
+}
+
+static int canbus_np_runtime_configure(struct device *dev, enum can_mode mode,
+				       u32_t bitrate)
+{
+	ARG_UNUSED(dev);
+	ARG_UNUSED(mode);
+	ARG_UNUSED(bitrate);
+
+	return 0;
+}
+
+static int canbus_np_send(struct device *dev, const struct zcan_frame *msg,
+			  s32_t timeout, can_tx_callback_t callback)
+{
+	struct canbus_np_context *ctx = dev->driver_data;
+	int ret = -ENODEV;
+
+	ARG_UNUSED(timeout);
+	ARG_UNUSED(callback);
+
+	if (ctx->dev_fd > 0) {
+		struct can_frame frame;
+
+		can_copy_zframe_to_frame(msg, &frame);
+
+		ret = canbus_np_write_data(ctx->dev_fd, &frame, sizeof(frame));
+		if (ret < 0) {
+			LOG_ERR("Cannot send CAN data len %d (%d)",
+				frame.can_dlc, -errno);
+		}
+	}
+
+	return ret < 0 ? ret : 0;
+}
+
+static int canbus_np_attach_msgq(struct device *dev, struct k_msgq *msgq,
+				 const struct zcan_filter *filter)
+{
+	ARG_UNUSED(dev);
+	ARG_UNUSED(msgq);
+	ARG_UNUSED(filter);
+
+	return 0;
+}
+
+static int canbus_np_attach_isr(struct device *dev, can_rx_callback_t isr,
+				const struct zcan_filter *filter)
+{
+	ARG_UNUSED(dev);
+	ARG_UNUSED(isr);
+	ARG_UNUSED(filter);
+
+	return 0;
+}
+
+static void canbus_np_detach(struct device *dev, int filter_nr)
+{
+	ARG_UNUSED(dev);
+	ARG_UNUSED(filter_nr);
+}
+
+static const struct can_driver_api can_api_funcs = {
+	.configure = canbus_np_runtime_configure,
+	.send = canbus_np_send,
+	.attach_msgq = canbus_np_attach_msgq,
+	.attach_isr = canbus_np_attach_isr,
+	.detach = canbus_np_detach,
+};
+
+#ifdef CONFIG_CAN_1
+
+DEVICE_AND_API_INIT(canbus_np_1, DT_CAN_1_NAME,
+		    canbus_np_init, &canbus_context_data, NULL,
+		    POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
+		    &can_api_funcs);
+
+#if defined(CONFIG_NET_SOCKETS_CAN)
+
+#define SOCKET_CAN_NAME_1 "SOCKET_CAN_1"
+#define SEND_TIMEOUT K_MSEC(100)
+#define BUF_ALLOC_TIMEOUT K_MSEC(50)
+
+/* TODO: make msgq size configurable */
+CAN_DEFINE_MSGQ(socket_can_msgq, 5);
+
+static void socket_can_iface_init(struct net_if *iface)
+{
+	struct device *dev = net_if_get_device(iface);
+	struct canbus_np_context *socket_context = dev->driver_data;
+
+	socket_context->iface = iface;
+
+	LOG_DBG("Init CAN interface %p dev %p", iface, dev);
+}
+
+static void tx_irq_callback(u32_t error_flags)
+{
+	if (error_flags) {
+		LOG_DBG("Callback! error-code: %d", error_flags);
+	}
+}
+
+/* This is called by net_if.c when packet is about to be sent */
+static int socket_can_send(struct device *dev, struct net_pkt *pkt)
+{
+	struct canbus_np_context *socket_context = dev->driver_data;
+	int ret;
+
+	if (net_pkt_family(pkt) != AF_CAN) {
+		return -EPFNOSUPPORT;
+	}
+
+	ret = can_send(socket_context->can_dev,
+		       (struct zcan_frame *)pkt->frags->data,
+		       SEND_TIMEOUT, tx_irq_callback);
+	if (ret) {
+		LOG_DBG("Cannot send socket CAN msg (%d)", ret);
+	}
+
+	/* If something went wrong, then we need to return negative value to
+	 * net_if.c:net_if_tx() so that the net_pkt will get released.
+	 */
+	return -ret;
+}
+
+static int socket_can_setsockopt(struct device *dev, void *obj,
+				 int level, int optname,
+				 const void *optval, socklen_t optlen)
+{
+	struct canbus_np_context *socket_context = dev->driver_data;
+	struct can_filter filter;
+
+	if (level != SOL_CAN_RAW && optname != CAN_RAW_FILTER) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	/* Our userspace can send either zcan_filter or can_filter struct.
+	 * They are different sizes so we need to convert them if needed.
+	 */
+	if (optlen != sizeof(struct can_filter) &&
+	    optlen != sizeof(struct zcan_filter)) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (optlen == sizeof(struct zcan_filter)) {
+		can_copy_zfilter_to_filter((struct zcan_filter *)optval,
+					   &filter);
+	} else {
+		memcpy(&filter, optval, sizeof(filter));
+	}
+
+	return canbus_np_setsockopt(socket_context->dev_fd, level, optname,
+				    &filter, sizeof(filter));
+}
+
+static struct canbus_api socket_can_api = {
+	.iface_api.init = socket_can_iface_init,
+	.send = socket_can_send,
+	.setsockopt = socket_can_setsockopt,
+};
+
+static int socket_can_init_1(struct device *dev)
+{
+	struct device *can_dev = DEVICE_GET(canbus_np_1);
+	struct canbus_np_context *socket_context = dev->driver_data;
+
+	LOG_DBG("Init socket CAN device %p (%s) for dev %p (%s)",
+		dev, dev->config->name, can_dev, can_dev->config->name);
+
+	socket_context->can_dev = can_dev;
+	socket_context->msgq = &socket_can_msgq;
+
+	return 0;
+}
+
+NET_DEVICE_INIT(socket_can_native_posix_1, SOCKET_CAN_NAME_1,
+		socket_can_init_1, &canbus_context_data, NULL,
+		CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &socket_can_api,
+		CANBUS_L2, NET_L2_GET_CTX_TYPE(CANBUS_L2), CAN_MTU);
+
+#endif /* CONFIG_NET_SOCKETS_CAN */
+
+#endif /* CONFIG_CAN_1 */
diff --git a/drivers/can/canbus_native_posix_adapt.c b/drivers/can/canbus_native_posix_adapt.c
diff --git a/drivers/can/canbus_native_posix_priv.h b/drivers/can/canbus_native_posix_priv.h
