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