// SPDX-License-Identifier: GPL-2.0-only /* * CAN driver for esd electronics gmbh CAN-USB/2, CAN-USB/3 and CAN-USB/Micro * * Copyright (C) 2010-2012 esd electronic system design gmbh, Matthias Fuchs <[email protected]> * Copyright (C) 2022-2023 esd electronics gmbh, Frank Jungclaus <[email protected]> */ #include <linux/can.h> #include <linux/can/dev.h> #include <linux/can/error.h> #include <linux/ethtool.h> #include <linux/module.h> #include <linux/netdevice.h> #include <linux/signal.h> #include <linux/slab.h> #include <linux/units.h> #include <linux/usb.h> MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; /* USB vendor and product ID */ #define ESD_USB_ESDGMBH_VENDOR_ID … #define ESD_USB_CANUSB2_PRODUCT_ID … #define ESD_USB_CANUSBM_PRODUCT_ID … #define ESD_USB_CANUSB3_PRODUCT_ID … /* CAN controller clock frequencies */ #define ESD_USB_2_CAN_CLOCK … #define ESD_USB_M_CAN_CLOCK … #define ESD_USB_3_CAN_CLOCK … /* Maximum number of CAN nets */ #define ESD_USB_MAX_NETS … /* USB commands */ #define ESD_USB_CMD_VERSION … #define ESD_USB_CMD_CAN_RX … #define ESD_USB_CMD_CAN_TX … #define ESD_USB_CMD_SETBAUD … #define ESD_USB_CMD_TS … #define ESD_USB_CMD_IDADD … /* esd CAN message flags - dlc field */ #define ESD_USB_RTR … #define ESD_USB_NO_BRS … #define ESD_USB_ESI … #define ESD_USB_FD … /* esd CAN message flags - id field */ #define ESD_USB_EXTID … #define ESD_USB_EVENT … #define ESD_USB_IDMASK … /* esd CAN event ids */ #define ESD_USB_EV_CAN_ERROR_EXT … /* baudrate message flags */ #define ESD_USB_LOM … #define ESD_USB_UBR … #define ESD_USB_NO_BAUDRATE … /* bit timing esd CAN-USB */ #define ESD_USB_2_TSEG1_SHIFT … #define ESD_USB_2_TSEG2_SHIFT … #define ESD_USB_2_SJW_SHIFT … #define ESD_USB_M_SJW_SHIFT … #define ESD_USB_TRIPLE_SAMPLES … /* Transmitter Delay Compensation */ #define ESD_USB_3_TDC_MODE_AUTO … /* esd IDADD message */ #define ESD_USB_ID_ENABLE … #define ESD_USB_MAX_ID_SEGMENT … /* SJA1000 ECC register (emulated by usb firmware) */ #define ESD_USB_SJA1000_ECC_SEG … #define ESD_USB_SJA1000_ECC_DIR … #define ESD_USB_SJA1000_ECC_ERR … #define ESD_USB_SJA1000_ECC_BIT … #define ESD_USB_SJA1000_ECC_FORM … #define ESD_USB_SJA1000_ECC_STUFF … #define ESD_USB_SJA1000_ECC_MASK … /* esd bus state event codes */ #define ESD_USB_BUSSTATE_MASK … #define ESD_USB_BUSSTATE_WARN … #define ESD_USB_BUSSTATE_ERRPASSIVE … #define ESD_USB_BUSSTATE_BUSOFF … #define ESD_USB_RX_BUFFER_SIZE … #define ESD_USB_MAX_RX_URBS … #define ESD_USB_MAX_TX_URBS … /* Modes for CAN-USB/3, to be used for esd_usb_3_set_baudrate_msg_x.mode */ #define ESD_USB_3_BAUDRATE_MODE_DISABLE … #define ESD_USB_3_BAUDRATE_MODE_INDEX … #define ESD_USB_3_BAUDRATE_MODE_BTR_CTRL … #define ESD_USB_3_BAUDRATE_MODE_BTR_CANONICAL … #define ESD_USB_3_BAUDRATE_MODE_NUM … #define ESD_USB_3_BAUDRATE_MODE_AUTOBAUD … /* Flags for CAN-USB/3, to be used for esd_usb_3_set_baudrate_msg_x.flags */ #define ESD_USB_3_BAUDRATE_FLAG_FD … #define ESD_USB_3_BAUDRATE_FLAG_LOM … #define ESD_USB_3_BAUDRATE_FLAG_STM … #define ESD_USB_3_BAUDRATE_FLAG_TRS … #define ESD_USB_3_BAUDRATE_FLAG_TXP … struct esd_usb_header_msg { … }; struct esd_usb_version_msg { … }; struct esd_usb_version_reply_msg { … }; struct esd_usb_rx_msg { … }; struct esd_usb_tx_msg { … }; struct esd_usb_tx_done_msg { … }; struct esd_usb_id_filter_msg { … }; struct esd_usb_set_baudrate_msg { … }; /* CAN-USB/3 baudrate configuration, used for nominal as well as for data bit rate */ struct esd_usb_3_baudrate_cfg { … }; /* In principle, the esd CAN-USB/3 supports Transmitter Delay Compensation (TDC), * but currently only the automatic TDC mode is supported by this driver. * An implementation for manual TDC configuration will follow. * * For information about struct esd_usb_3_tdc_cfg, see * NTCAN Application Developers Manual, 6.2.25 NTCAN_TDC_CFG + related chapters * https://esd.eu/fileadmin/esd/docs/manuals/NTCAN_Part1_Function_API_Manual_en_56.pdf */ struct esd_usb_3_tdc_cfg { … }; /* Extended version of the above set_baudrate_msg for a CAN-USB/3 * to define the CAN bit timing configuration of the CAN controller in * CAN FD mode as well as in Classical CAN mode. * * The payload of this command is a NTCAN_BAUDRATE_X structure according to * esd electronics gmbh, NTCAN Application Developers Manual, 6.2.15 NTCAN_BAUDRATE_X * https://esd.eu/fileadmin/esd/docs/manuals/NTCAN_Part1_Function_API_Manual_en_56.pdf */ struct esd_usb_3_set_baudrate_msg_x { … }; /* Main message type used between library and application */ esd_usb_msg; static struct usb_device_id esd_usb_table[] = …; MODULE_DEVICE_TABLE(usb, esd_usb_table); struct esd_usb_net_priv; struct esd_tx_urb_context { … }; struct esd_usb { … }; struct esd_usb_net_priv { … }; static void esd_usb_rx_event(struct esd_usb_net_priv *priv, union esd_usb_msg *msg) { … } static void esd_usb_rx_can_msg(struct esd_usb_net_priv *priv, union esd_usb_msg *msg) { … } static void esd_usb_tx_done_msg(struct esd_usb_net_priv *priv, union esd_usb_msg *msg) { … } static void esd_usb_read_bulk_callback(struct urb *urb) { … } /* callback for bulk IN urb */ static void esd_usb_write_bulk_callback(struct urb *urb) { … } static ssize_t firmware_show(struct device *d, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(firmware); static ssize_t hardware_show(struct device *d, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(hardware); static ssize_t nets_show(struct device *d, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(nets); static int esd_usb_send_msg(struct esd_usb *dev, union esd_usb_msg *msg) { … } static int esd_usb_wait_msg(struct esd_usb *dev, union esd_usb_msg *msg) { … } static int esd_usb_setup_rx_urbs(struct esd_usb *dev) { … } /* Start interface */ static int esd_usb_start(struct esd_usb_net_priv *priv) { … } static void unlink_all_urbs(struct esd_usb *dev) { … } static int esd_usb_open(struct net_device *netdev) { … } static netdev_tx_t esd_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev) { … } static int esd_usb_close(struct net_device *netdev) { … } static const struct net_device_ops esd_usb_netdev_ops = …; static const struct ethtool_ops esd_usb_ethtool_ops = …; static const struct can_bittiming_const esd_usb_2_bittiming_const = …; static int esd_usb_2_set_bittiming(struct net_device *netdev) { … } /* Nominal bittiming constants, see * Microchip SAM E70/S70/V70/V71, Data Sheet, Rev. G - 07/2022 * 48.6.8 MCAN Nominal Bit Timing and Prescaler Register */ static const struct can_bittiming_const esd_usb_3_nom_bittiming_const = …; /* Data bittiming constants, see * Microchip SAM E70/S70/V70/V71, Data Sheet, Rev. G - 07/2022 * 48.6.4 MCAN Data Bit Timing and Prescaler Register */ static const struct can_bittiming_const esd_usb_3_data_bittiming_const = …; static int esd_usb_3_set_bittiming(struct net_device *netdev) { … } static int esd_usb_get_berr_counter(const struct net_device *netdev, struct can_berr_counter *bec) { … } static int esd_usb_set_mode(struct net_device *netdev, enum can_mode mode) { … } static int esd_usb_probe_one_net(struct usb_interface *intf, int index) { … } /* probe function for new USB devices * * check version information and number of available * CAN interfaces */ static int esd_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 esd_usb_disconnect(struct usb_interface *intf) { … } /* usb specific object needed to register this driver with the usb subsystem */ static struct usb_driver esd_usb_driver = …; module_usb_driver(…) …;
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