// SPDX-License-Identifier: GPL-2.0-only /* * CAN driver for PEAK System PCAN-USB adapter * Derived from the PCAN project file driver/src/pcan_usb.c * * Copyright (C) 2003-2010 PEAK System-Technik GmbH * Copyright (C) 2011-2012 Stephane Grosjean <[email protected]> * * Many thanks to Klaus Hitschler <[email protected]> */ #include <asm/unaligned.h> #include <linux/ethtool.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> #include "pcan_usb_core.h" /* PCAN-USB Endpoints */ #define PCAN_USB_EP_CMDOUT … #define PCAN_USB_EP_CMDIN … #define PCAN_USB_EP_MSGOUT … #define PCAN_USB_EP_MSGIN … /* PCAN-USB command struct */ #define PCAN_USB_CMD_FUNC … #define PCAN_USB_CMD_NUM … #define PCAN_USB_CMD_ARGS … #define PCAN_USB_CMD_ARGS_LEN … #define PCAN_USB_CMD_LEN … /* PCAN-USB commands */ #define PCAN_USB_CMD_BITRATE … #define PCAN_USB_CMD_SET_BUS … #define PCAN_USB_CMD_DEVID … #define PCAN_USB_CMD_SN … #define PCAN_USB_CMD_REGISTER … #define PCAN_USB_CMD_EXT_VCC … #define PCAN_USB_CMD_ERR_FR … #define PCAN_USB_CMD_LED … /* PCAN_USB_CMD_SET_BUS number arg */ #define PCAN_USB_BUS_XCVER … #define PCAN_USB_BUS_SILENT_MODE … /* PCAN_USB_CMD_xxx functions */ #define PCAN_USB_GET … #define PCAN_USB_SET … /* PCAN-USB command timeout (ms.) */ #define PCAN_USB_COMMAND_TIMEOUT … /* PCAN-USB startup timeout (ms.) */ #define PCAN_USB_STARTUP_TIMEOUT … /* PCAN-USB rx/tx buffers size */ #define PCAN_USB_RX_BUFFER_SIZE … #define PCAN_USB_TX_BUFFER_SIZE … #define PCAN_USB_MSG_HEADER_LEN … #define PCAN_USB_MSG_TX_CAN … /* PCAN-USB adapter internal clock (MHz) */ #define PCAN_USB_CRYSTAL_HZ … /* PCAN-USB USB message record status/len field */ #define PCAN_USB_STATUSLEN_TIMESTAMP … #define PCAN_USB_STATUSLEN_INTERNAL … #define PCAN_USB_STATUSLEN_EXT_ID … #define PCAN_USB_STATUSLEN_RTR … #define PCAN_USB_STATUSLEN_DLC … /* PCAN-USB 4.1 CAN Id tx extended flags */ #define PCAN_USB_TX_SRR … #define PCAN_USB_TX_AT … /* PCAN-USB error flags */ #define PCAN_USB_ERROR_TXFULL … #define PCAN_USB_ERROR_RXQOVR … #define PCAN_USB_ERROR_BUS_LIGHT … #define PCAN_USB_ERROR_BUS_HEAVY … #define PCAN_USB_ERROR_BUS_OFF … #define PCAN_USB_ERROR_RXQEMPTY … #define PCAN_USB_ERROR_QOVR … #define PCAN_USB_ERROR_TXQFULL … #define PCAN_USB_ERROR_BUS … /* SJA1000 modes */ #define SJA1000_MODE_NORMAL … #define SJA1000_MODE_INIT … /* * tick duration = 42.666 us => * (tick_number * 44739243) >> 20 ~ (tick_number * 42666) / 1000 * accuracy = 10^-7 */ #define PCAN_USB_TS_DIV_SHIFTER … #define PCAN_USB_TS_US_PER_TICK … /* PCAN-USB messages record types */ #define PCAN_USB_REC_ERROR … #define PCAN_USB_REC_ANALOG … #define PCAN_USB_REC_BUSLOAD … #define PCAN_USB_REC_TS … #define PCAN_USB_REC_BUSEVT … /* CAN bus events notifications selection mask */ #define PCAN_USB_ERR_RXERR … #define PCAN_USB_ERR_TXERR … /* This mask generates an usb packet each time the state of the bus changes. * In other words, its interest is to know which side among rx and tx is * responsible of the change of the bus state. */ #define PCAN_USB_BERR_MASK … /* identify bus event packets with rx/tx error counters */ #define PCAN_USB_ERR_CNT_DEC … #define PCAN_USB_ERR_CNT_INC … /* private to PCAN-USB adapter */ struct pcan_usb { … }; /* incoming message context for decoding */ struct pcan_usb_msg_context { … }; /* * send a command */ static int pcan_usb_send_cmd(struct peak_usb_device *dev, u8 f, u8 n, u8 *p) { … } /* * send a command then wait for its response */ static int pcan_usb_wait_rsp(struct peak_usb_device *dev, u8 f, u8 n, u8 *p) { … } static int pcan_usb_set_sja1000(struct peak_usb_device *dev, u8 mode) { … } static int pcan_usb_set_bus(struct peak_usb_device *dev, u8 onoff) { … } static int pcan_usb_set_silent(struct peak_usb_device *dev, u8 onoff) { … } /* send the cmd to be notified from bus errors */ static int pcan_usb_set_err_frame(struct peak_usb_device *dev, u8 err_mask) { … } static int pcan_usb_set_ext_vcc(struct peak_usb_device *dev, u8 onoff) { … } static int pcan_usb_set_led(struct peak_usb_device *dev, u8 onoff) { … } /* * set bittiming value to can */ static int pcan_usb_set_bittiming(struct peak_usb_device *dev, struct can_bittiming *bt) { … } /* * init/reset can */ static int pcan_usb_write_mode(struct peak_usb_device *dev, u8 onoff) { … } /* * handle end of waiting for the device to reset */ static void pcan_usb_restart(struct timer_list *t) { … } /* * handle the submission of the restart urb */ static void pcan_usb_restart_pending(struct urb *urb) { … } /* * handle asynchronous restart */ static int pcan_usb_restart_async(struct peak_usb_device *dev, struct urb *urb, u8 *buf) { … } /* * read serial number from device */ static int pcan_usb_get_serial(struct peak_usb_device *dev, u32 *serial_number) { … } /* * read can channel id from device */ static int pcan_usb_get_can_channel_id(struct peak_usb_device *dev, u32 *can_ch_id) { … } /* set a new CAN channel id in the flash memory of the device */ static int pcan_usb_set_can_channel_id(struct peak_usb_device *dev, u32 can_ch_id) { … } /* * update current time ref with received timestamp */ static int pcan_usb_update_ts(struct pcan_usb_msg_context *mc) { … } /* * decode received timestamp */ static int pcan_usb_decode_ts(struct pcan_usb_msg_context *mc, u8 first_packet) { … } static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n, u8 status_len) { … } /* decode bus event usb packet: first byte contains rxerr while 2nd one contains * txerr. */ static int pcan_usb_handle_bus_evt(struct pcan_usb_msg_context *mc, u8 ir) { … } /* * decode non-data usb message */ static int pcan_usb_decode_status(struct pcan_usb_msg_context *mc, u8 status_len) { … } /* * decode data usb message */ static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len) { … } /* * process incoming message */ static int pcan_usb_decode_msg(struct peak_usb_device *dev, u8 *ibuf, u32 lbuf) { … } /* * process any incoming buffer */ static int pcan_usb_decode_buf(struct peak_usb_device *dev, struct urb *urb) { … } /* * process outgoing packet */ static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb, u8 *obuf, size_t *size) { … } /* socket callback used to copy berr counters values received through USB */ static int pcan_usb_get_berr_counter(const struct net_device *netdev, struct can_berr_counter *bec) { … } /* * start interface */ static int pcan_usb_start(struct peak_usb_device *dev) { … } static int pcan_usb_init(struct peak_usb_device *dev) { … } /* * probe function for new PCAN-USB usb interface */ static int pcan_usb_probe(struct usb_interface *intf) { … } static int pcan_usb_set_phys_id(struct net_device *netdev, enum ethtool_phys_id_state state) { … } /* This device only handles 8-bit CAN channel id. */ static int pcan_usb_get_eeprom_len(struct net_device *netdev) { … } static const struct ethtool_ops pcan_usb_ethtool_ops = …; /* * describe the PCAN-USB adapter */ static const struct can_bittiming_const pcan_usb_const = …; const struct peak_usb_adapter pcan_usb = …;
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