// SPDX-License-Identifier: GPL-2.0-only /* * CAN driver for EMS Dr. Thomas Wuensche CPC-USB/ARM7 * * Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche */ #include <linux/ethtool.h> #include <linux/signal.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/netdevice.h> #include <linux/usb.h> #include <linux/can.h> #include <linux/can/dev.h> #include <linux/can/error.h> MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; /* Control-Values for CPC_Control() Command Subject Selection */ #define CONTR_CAN_MESSAGE … #define CONTR_CAN_STATE … #define CONTR_BUS_ERROR … /* Control Command Actions */ #define CONTR_CONT_OFF … #define CONTR_CONT_ON … #define CONTR_ONCE … /* Messages from CPC to PC */ #define CPC_MSG_TYPE_CAN_FRAME … #define CPC_MSG_TYPE_RTR_FRAME … #define CPC_MSG_TYPE_CAN_PARAMS … #define CPC_MSG_TYPE_CAN_STATE … #define CPC_MSG_TYPE_EXT_CAN_FRAME … #define CPC_MSG_TYPE_EXT_RTR_FRAME … #define CPC_MSG_TYPE_CONTROL … #define CPC_MSG_TYPE_CONFIRM … #define CPC_MSG_TYPE_OVERRUN … #define CPC_MSG_TYPE_CAN_FRAME_ERROR … #define CPC_MSG_TYPE_ERR_COUNTER … /* Messages from the PC to the CPC interface */ #define CPC_CMD_TYPE_CAN_FRAME … #define CPC_CMD_TYPE_CONTROL … #define CPC_CMD_TYPE_CAN_PARAMS … #define CPC_CMD_TYPE_RTR_FRAME … #define CPC_CMD_TYPE_CAN_STATE … #define CPC_CMD_TYPE_EXT_CAN_FRAME … #define CPC_CMD_TYPE_EXT_RTR_FRAME … #define CPC_CMD_TYPE_CAN_EXIT … #define CPC_CMD_TYPE_INQ_ERR_COUNTER … #define CPC_CMD_TYPE_CLEAR_MSG_QUEUE … #define CPC_CMD_TYPE_CLEAR_CMD_QUEUE … #define CPC_CC_TYPE_SJA1000 … #define CPC_CAN_ECODE_ERRFRAME … /* Overrun types */ #define CPC_OVR_EVENT_CAN … #define CPC_OVR_EVENT_CANSTATE … #define CPC_OVR_EVENT_BUSERROR … /* * If the CAN controller lost a message we indicate it with the highest bit * set in the count field. */ #define CPC_OVR_HW … /* Size of the "struct ems_cpc_msg" without the union */ #define CPC_MSG_HEADER_LEN … #define CPC_CAN_MSG_MIN_SIZE … /* Define these values to match your devices */ #define USB_CPCUSB_VENDOR_ID … #define USB_CPCUSB_ARM7_PRODUCT_ID … /* Mode register NXP LPC2119/SJA1000 CAN Controller */ #define SJA1000_MOD_NORMAL … #define SJA1000_MOD_RM … /* ECC register NXP LPC2119/SJA1000 CAN Controller */ #define SJA1000_ECC_SEG … #define SJA1000_ECC_DIR … #define SJA1000_ECC_ERR … #define SJA1000_ECC_BIT … #define SJA1000_ECC_FORM … #define SJA1000_ECC_STUFF … #define SJA1000_ECC_MASK … /* Status register content */ #define SJA1000_SR_BS … #define SJA1000_SR_ES … #define SJA1000_DEFAULT_OUTPUT_CONTROL … /* * The device actually uses a 16MHz clock to generate the CAN clock * but it expects SJA1000 bit settings based on 8MHz (is internally * converted). */ #define EMS_USB_ARM7_CLOCK … #define CPC_TX_QUEUE_TRIGGER_LOW … #define CPC_TX_QUEUE_TRIGGER_HIGH … /* * CAN-Message representation in a CPC_MSG. Message object type is * CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or * CPC_MSG_TYPE_EXT_CAN_FRAME or CPC_MSG_TYPE_EXT_RTR_FRAME. */ struct cpc_can_msg { … }; /* Representation of the CAN parameters for the SJA1000 controller */ struct cpc_sja1000_params { … }; /* CAN params message representation */ struct cpc_can_params { … }; /* Structure for confirmed message handling */ struct cpc_confirm { … }; /* Structure for overrun conditions */ struct cpc_overrun { … }; /* SJA1000 CAN errors (compatible to NXP LPC2119) */ struct cpc_sja1000_can_error { … }; /* structure for CAN error conditions */ struct cpc_can_error { … }; /* * Structure containing RX/TX error counter. This structure is used to request * the values of the CAN controllers TX and RX error counter. */ struct cpc_can_err_counter { … }; /* Main message type used between library and application */ struct __packed ems_cpc_msg { … }; /* * Table of devices that work with this driver * NOTE: This driver supports only CPC-USB/ARM7 (LPC2119) yet. */ static struct usb_device_id ems_usb_table[] = …; MODULE_DEVICE_TABLE(usb, ems_usb_table); #define RX_BUFFER_SIZE … #define CPC_HEADER_SIZE … #define INTR_IN_BUFFER_SIZE … #define MAX_RX_URBS … #define MAX_TX_URBS … struct ems_usb; struct ems_tx_urb_context { … }; struct ems_usb { … }; static void ems_usb_read_interrupt_callback(struct urb *urb) { … } static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) { … } static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg) { … } /* * callback for bulk IN urb */ static void ems_usb_read_bulk_callback(struct urb *urb) { … } /* * callback for bulk IN urb */ static void ems_usb_write_bulk_callback(struct urb *urb) { … } /* * Send the given CPC command synchronously */ static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) { … } /* * Change CAN controllers' mode register */ static int ems_usb_write_mode(struct ems_usb *dev, u8 mode) { … } /* * Send a CPC_Control command to change behaviour when interface receives a CAN * message, bus error or CAN state changed notifications. */ static int ems_usb_control_cmd(struct ems_usb *dev, u8 val) { … } /* * Start interface */ static int ems_usb_start(struct ems_usb *dev) { … } static void unlink_all_urbs(struct ems_usb *dev) { … } static int ems_usb_open(struct net_device *netdev) { … } static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev) { … } static int ems_usb_close(struct net_device *netdev) { … } static const struct net_device_ops ems_usb_netdev_ops = …; static const struct ethtool_ops ems_usb_ethtool_ops = …; static const struct can_bittiming_const ems_usb_bittiming_const = …; static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode) { … } static int ems_usb_set_bittiming(struct net_device *netdev) { … } static void init_params_sja1000(struct ems_cpc_msg *msg) { … } /* * probe function for new CPC-USB devices */ static int ems_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) { … } /* * called by the usb core when the device is removed from the system */ static void ems_usb_disconnect(struct usb_interface *intf) { … } /* usb specific object needed to register this driver with the usb subsystem */ static struct usb_driver ems_usb_driver = …; module_usb_driver(…) …;
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