386 lines
13 KiB
C
386 lines
13 KiB
C
/****************************************************************************
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* net/can/can.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __NET_CAN_CAN_H
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#define __NET_CAN_CAN_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <poll.h>
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#include <netpacket/can.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/can.h>
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#include <nuttx/net/netdev.h>
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#include "devif/devif.h"
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#include "socket/socket.h"
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#ifdef CONFIG_NET_CAN_NOTIFIER
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# include <nuttx/wqueue.h>
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#endif
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#ifdef CONFIG_NET_CAN
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Allocate a new packet socket data callback */
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#define can_callback_alloc(dev,conn) \
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devif_callback_alloc(dev, &conn->list)
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#define can_callback_free(dev,conn,cb) \
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devif_conn_callback_free(dev, cb, &conn->list)
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* This is a container that holds the poll-related information */
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struct can_poll_s
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{
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FAR struct socket *psock; /* Needed to handle loss of connection */
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FAR struct net_driver_s *dev; /* Needed to free the callback structure */
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struct pollfd *fds; /* Needed to handle poll events */
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FAR struct devif_callback_s *cb; /* Needed to teardown the poll */
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};
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/* This "connection" structure describes the underlying state of the socket */
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struct can_conn_s
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{
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/* Common prologue of all connection structures. */
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dq_entry_t node; /* Supports a doubly linked list */
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/* This is a list of NetLink connection callbacks. Each callback
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* represents a thread that is stalled, waiting for a device-specific
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* event.
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*/
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FAR struct devif_callback_s *list; /* NetLink callbacks */
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FAR struct net_driver_s *dev; /* Reference to CAN device */
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/* Read-ahead buffering.
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*
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* readahead - A singly linked list of type struct iob_qentry_s
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* where the CAN/IP read-ahead data is retained.
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*/
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struct iob_queue_s readahead; /* remove Read-ahead buffering */
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/* CAN-specific content follows */
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uint8_t protocol; /* Selected CAN protocol */
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int16_t crefs; /* Reference count */
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/* The following is a list of poll structures of threads waiting for
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* socket events.
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*/
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struct can_poll_s pollinfo[4]; /* FIXME make dynamic */
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#ifdef CONFIG_NET_CANPROTO_OPTIONS
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int32_t loopback;
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int32_t recv_own_msgs;
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#ifdef CONFIG_NET_CAN_CANFD
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int32_t fd_frames;
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#endif
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struct can_filter filters[CONFIG_NET_CAN_RAW_FILTER_MAX];
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int32_t filter_count;
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# ifdef CONFIG_NET_CAN_RAW_TX_DEADLINE
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int32_t tx_deadline;
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# endif
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#endif
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#ifdef CONFIG_NET_TIMESTAMP
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FAR struct socket *psock; /* Needed to get SO_TIMESTAMP value */
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#endif
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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# define EXTERN extern "C"
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extern "C"
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{
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#else
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# define EXTERN extern
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#endif
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EXTERN const struct sock_intf_s g_can_sockif;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct sockaddr_can; /* Forward reference */
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/****************************************************************************
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* Name: can_initialize()
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*
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* Description:
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* Initialize the NetLink connection structures. Called once and only
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* from the networking layer.
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*
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****************************************************************************/
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void can_initialize(void);
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/****************************************************************************
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* Name: can_alloc()
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*
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* Description:
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* Allocate a new, uninitialized NetLink connection structure. This is
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* normally something done by the implementation of the socket() API
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*
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****************************************************************************/
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FAR struct can_conn_s *can_alloc(void);
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/****************************************************************************
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* Name: can_free()
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*
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* Description:
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* Free a NetLink connection structure that is no longer in use. This
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* should be done by the implementation of close().
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*
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****************************************************************************/
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void can_free(FAR struct can_conn_s *conn);
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/****************************************************************************
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* Name: can_nextconn()
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*
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* Description:
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* Traverse the list of allocated NetLink connections
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*
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* Assumptions:
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* This function is called from NetLink device logic.
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*
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****************************************************************************/
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FAR struct can_conn_s *can_nextconn(FAR struct can_conn_s *conn);
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/****************************************************************************
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* Name: can_callback
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*
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* Description:
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* Inform the application holding the packet socket of a change in state.
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*
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* Returned Value:
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* OK if packet has been processed, otherwise ERROR.
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*
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* Assumptions:
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* This function is called from network logic at with the network locked.
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*
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****************************************************************************/
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uint16_t can_callback(FAR struct net_driver_s *dev,
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FAR struct can_conn_s *conn, uint16_t flags);
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/****************************************************************************
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* Name: can_datahandler
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*
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* Description:
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* Handle data that is not accepted by the application. This may be called
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* either (1) from the data receive logic if it cannot buffer the data, or
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* (2) from the CAN event logic is there is no listener in place ready to
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* receive the data.
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*
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* Input Parameters:
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* conn - A pointer to the CAN connection structure
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* buffer - A pointer to the buffer to be copied to the read-ahead
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* buffers
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* buflen - The number of bytes to copy to the read-ahead buffer.
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*
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* Returned Value:
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* The number of bytes actually buffered is returned. This will be either
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* zero or equal to buflen; partial packets are not buffered.
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*
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* Assumptions:
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* - The caller has checked that CAN_NEWDATA is set in flags and that is no
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* other handler available to process the incoming data.
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* - Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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uint16_t can_datahandler(FAR struct can_conn_s *conn, FAR uint8_t *buffer,
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uint16_t buflen);
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/****************************************************************************
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* Name: can_recvfrom
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*
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* Description:
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* Implements the socket recvfrom interface pkt_recvfrom() receives
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* messages from a socket, and may be used to receive data on a socket
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* whether or not it is connection-oriented.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* buf Buffer to receive data
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* len Length of buffer
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* flags Receive flags
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* from Address of source (may be NULL)
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* fromlen The length of the address structure
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*
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* Returned Value:
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* On success, returns the number of characters received. If no data is
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* available to be received and the peer has performed an orderly shutdown,
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* recv() will return 0. Otherwise, on errors, a negated errno value is
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* returned (see recvfrom() for the list of appropriate error values).
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*
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****************************************************************************/
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ssize_t can_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
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int flags, FAR struct sockaddr *from,
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FAR socklen_t *fromlen);
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/****************************************************************************
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* Name: can_recvmsg
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*
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* Description:
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* recvmsg() receives messages from a socket, and may be used to receive
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* data on a socket whether or not it is connection-oriented.
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*
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* If from is not NULL, and the underlying protocol provides the source
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* address, this source address is filled in. The argument 'fromlen'
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* initialized to the size of the buffer associated with from, and modified
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* on return to indicate the actual size of the address stored there.
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*
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* Input Parameters:
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* psock A pointer to a NuttX-specific, internal socket structure
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* msg Buffer to receive msg
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* flags Receive flags (ignored)
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*
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****************************************************************************/
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#ifdef CONFIG_NET_CMSG
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ssize_t can_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
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int flags);
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#endif
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/****************************************************************************
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* Name: can_poll
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*
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* Description:
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* Poll a CAN connection structure for availability of TX data
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation
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* conn - The CAN "connection" to poll for TX data
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* Called from network stack logic with the network stack locked
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*
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****************************************************************************/
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void can_poll(FAR struct net_driver_s *dev, FAR struct can_conn_s *conn);
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/****************************************************************************
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* Name: psock_can_send
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*
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* Description:
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* The psock_can_send() call may be used only when the packet socket is in
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* a connected state (so that the intended recipient is known).
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*
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* Input Parameters:
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* psock An instance of the internal socket structure.
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* buf Data to send
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* len Length of data to send
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* a negated errno value is returned. See send() for the complete list
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* of return values.
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*
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****************************************************************************/
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struct socket;
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ssize_t psock_can_send(FAR struct socket *psock, FAR const void *buf,
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size_t len);
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/****************************************************************************
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* Name: psock_can_sendmsg
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*
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* Description:
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* The psock_can_sendmsg() call may be used only when the packet socket is
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* in a connected state (so that the intended recipient is known).
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*
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* Input Parameters:
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* psock An instance of the internal socket structure.
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* msg msg to send
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* a negated errno value is returned. See send() for the complete list
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* of return values.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_CMSG
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ssize_t psock_can_sendmsg(FAR struct socket *psock, FAR struct msghdr *msg);
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#endif
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/****************************************************************************
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* Name: can_readahead_signal
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*
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* Description:
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* Read-ahead data has been buffered. Signal all threads waiting for
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* read-ahead data to become available.
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*
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* When read-ahead data becomes available, *all* of the workers waiting
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* for read-ahead data will be executed. If there are multiple workers
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* waiting for read-ahead data then only the first to execute will get the
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* data. Others will need to call can_readahead_notifier_setup() once
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* again.
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*
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* Input Parameters:
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* conn - The CAN connection where read-ahead data was just buffered.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_CAN_NOTIFIER
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void can_readahead_signal(FAR struct can_conn_s *conn);
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_NET_CAN */
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#endif /* __NET_CAN_CAN_H */
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