// SPDX-License-Identifier: GPL-2.0-only /* * CAN driver for "8 devices" USB2CAN converter * * Copyright (C) 2012 Bernd Krumboeck ([email protected]) * * This driver is inspired by the 3.2.0 version of drivers/net/can/usb/ems_usb.c * and drivers/net/can/usb/esd_usb2.c * * Many thanks to Gerhard Bertelsmann ([email protected]) * for testing and fixing this driver. Also many thanks to "8 devices", * who were very cooperative and answered my questions. */ #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> /* driver constants */ #define MAX_RX_URBS … #define MAX_TX_URBS … #define RX_BUFFER_SIZE … /* vendor and product id */ #define USB_8DEV_VENDOR_ID … #define USB_8DEV_PRODUCT_ID … /* endpoints */ enum usb_8dev_endpoint { … }; /* device CAN clock */ #define USB_8DEV_ABP_CLOCK … /* setup flags */ #define USB_8DEV_SILENT … #define USB_8DEV_LOOPBACK … #define USB_8DEV_DISABLE_AUTO_RESTRANS … #define USB_8DEV_STATUS_FRAME … /* commands */ enum usb_8dev_cmd { … }; /* command options */ #define USB_8DEV_BAUD_MANUAL … #define USB_8DEV_CMD_START … #define USB_8DEV_CMD_END … #define USB_8DEV_CMD_SUCCESS … #define USB_8DEV_CMD_ERROR … #define USB_8DEV_CMD_TIMEOUT … /* frames */ #define USB_8DEV_DATA_START … #define USB_8DEV_DATA_END … #define USB_8DEV_TYPE_CAN_FRAME … #define USB_8DEV_TYPE_ERROR_FRAME … #define USB_8DEV_EXTID … #define USB_8DEV_RTR … #define USB_8DEV_ERR_FLAG … /* status */ #define USB_8DEV_STATUSMSG_OK … #define USB_8DEV_STATUSMSG_OVERRUN … #define USB_8DEV_STATUSMSG_BUSLIGHT … #define USB_8DEV_STATUSMSG_BUSHEAVY … #define USB_8DEV_STATUSMSG_BUSOFF … #define USB_8DEV_STATUSMSG_STUFF … #define USB_8DEV_STATUSMSG_FORM … #define USB_8DEV_STATUSMSG_ACK … #define USB_8DEV_STATUSMSG_BIT0 … #define USB_8DEV_STATUSMSG_BIT1 … #define USB_8DEV_STATUSMSG_CRC … #define USB_8DEV_RP_MASK … /* table of devices that work with this driver */ static const struct usb_device_id usb_8dev_table[] = …; MODULE_DEVICE_TABLE(usb, usb_8dev_table); struct usb_8dev_tx_urb_context { … }; /* Structure to hold all of our device specific stuff */ struct usb_8dev_priv { … }; /* tx frame */ struct __packed usb_8dev_tx_msg { … }; /* rx frame */ struct __packed usb_8dev_rx_msg { … }; /* command frame */ struct __packed usb_8dev_cmd_msg { … }; static int usb_8dev_send_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size) { … } static int usb_8dev_wait_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size, int *actual_length) { … } /* Send command to device and receive result. * Command was successful when opt1 = 0. */ static int usb_8dev_send_cmd(struct usb_8dev_priv *priv, struct usb_8dev_cmd_msg *out, struct usb_8dev_cmd_msg *in) { … } /* Send open command to device */ static int usb_8dev_cmd_open(struct usb_8dev_priv *priv) { … } /* Send close command to device */ static int usb_8dev_cmd_close(struct usb_8dev_priv *priv) { … } /* Get firmware and hardware version */ static int usb_8dev_cmd_version(struct usb_8dev_priv *priv, u32 *res) { … } /* Set network device mode * * Maybe we should leave this function empty, because the device * set mode variable with open command. */ static int usb_8dev_set_mode(struct net_device *netdev, enum can_mode mode) { … } /* Read error/status frames */ static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv, struct usb_8dev_rx_msg *msg) { … } /* Read data and status frames */ static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv, struct usb_8dev_rx_msg *msg) { … } /* Callback for reading data from device * * Check urb status, call read function and resubmit urb read operation. */ static void usb_8dev_read_bulk_callback(struct urb *urb) { … } /* Callback handler for write operations * * Free allocated buffers, check transmit status and * calculate statistic. */ static void usb_8dev_write_bulk_callback(struct urb *urb) { … } /* Send data to device */ static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb, struct net_device *netdev) { … } static int usb_8dev_get_berr_counter(const struct net_device *netdev, struct can_berr_counter *bec) { … } /* Start USB device */ static int usb_8dev_start(struct usb_8dev_priv *priv) { … } /* Open USB device */ static int usb_8dev_open(struct net_device *netdev) { … } static void unlink_all_urbs(struct usb_8dev_priv *priv) { … } /* Close USB device */ static int usb_8dev_close(struct net_device *netdev) { … } static const struct net_device_ops usb_8dev_netdev_ops = …; static const struct ethtool_ops usb_8dev_ethtool_ops = …; static const struct can_bittiming_const usb_8dev_bittiming_const = …; /* Probe USB device * * Check device and firmware. * Set supported modes and bittiming constants. * Allocate some memory. */ static int usb_8dev_probe(struct usb_interface *intf, const struct usb_device_id *id) { … } /* Called by the usb core when driver is unloaded or device is removed */ static void usb_8dev_disconnect(struct usb_interface *intf) { … } static struct usb_driver usb_8dev_driver = …; module_usb_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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